Fossil

#define MODE_Semi     3  /* Same as MODE_List but append ";" to each line */
#define MODE_Html     4  /* Generate an XHTML table */
#define MODE_Insert   5  /* Generate SQL "insert" statements */
#define MODE_Tcl      6  /* Generate ANSI-C or TCL quoted elements */
#define MODE_Csv      7  /* Quote strings, numbers are plain */
#define MODE_Explain  8  /* Like MODE_Column, but do not truncate data */
#define MODE_Ascii    9  /* Use ASCII unit and record separators (0x1F/0x1E) */


static const char *modeDescr[] = {
  "line",
  "column",
  "list",
  "semi",
  "html",
  "insert",
  "tcl",
  "csv",
  "explain",
  "ascii",

};

/*
** These are the column/row/line separators used by the various
** import/export modes.
*/
#define SEP_Column    "|"
................................................................................
          utf8_printf(p->out,"%-*.*s%s",w,w,
              azArg[i] ? azArg[i] : p->nullValue,
              i==nArg-1 ? rowSep : "  ");
        }
      }
      break;
    }
    case MODE_Semi:































































    case MODE_List: {
      if( p->cnt++==0 && p->showHeader ){
        for(i=0; i<nArg; i++){
          utf8_printf(p->out,"%s%s",azCol[i],
                  i==nArg-1 ? p->rowSeparator : p->colSeparator);
        }
      }
................................................................................
      if( azArg==0 ) break;
      for(i=0; i<nArg; i++){
        char *z = azArg[i];
        if( z==0 ) z = p->nullValue;
        utf8_printf(p->out, "%s", z);
        if( i<nArg-1 ){
          utf8_printf(p->out, "%s", p->colSeparator);
        }else if( p->cMode==MODE_Semi ){
          utf8_printf(p->out, ";%s", p->rowSeparator);
        }else{
          utf8_printf(p->out, "%s", p->rowSeparator);
        }
      }
      break;
    }
    case MODE_Html: {
................................................................................

    if( str_in_array(zOp, azNext) ){
      for(i=p2op; i<iOp; i++) p->aiIndent[i] += 2;
    }
    if( str_in_array(zOp, azGoto) && p2op<p->nIndent
     && (abYield[p2op] || sqlite3_column_int(pSql, 2))
    ){
      for(i=p2op+1; i<iOp; i++) p->aiIndent[i] += 2;
    }
  }

  p->iIndent = 0;
  sqlite3_free(abYield);
  sqlite3_reset(pSql);
}
................................................................................
*/
static void explain_data_delete(ShellState *p){
  sqlite3_free(p->aiIndent);
  p->aiIndent = 0;
  p->nIndent = 0;
  p->iIndent = 0;
}



































































































/*
** Execute a statement or set of statements.  Print
** any result rows/columns depending on the current mode
** set via the supplied callback.
**
** This is very similar to SQLite's built-in sqlite3_exec()
................................................................................
  const char *zLeftover;          /* Tail of unprocessed SQL */

  if( pzErrMsg ){
    *pzErrMsg = NULL;
  }

  while( zSql[0] && (SQLITE_OK == rc) ){

    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
    if( SQLITE_OK != rc ){
      if( pzErrMsg ){
        *pzErrMsg = save_err_msg(db);
      }
    }else{
      if( !pStmt ){
        /* this happens for a comment or white-space */
        zSql = zLeftover;
        while( IsSpace(zSql[0]) ) zSql++;
        continue;
      }



      /* save off the prepared statment handle and reset row count */
      if( pArg ){
        pArg->pStmt = pStmt;
        pArg->cnt = 0;
      }

      /* echo the sql statement if echo on */
      if( pArg && pArg->echoOn ){
        const char *zStmtSql = sqlite3_sql(pStmt);
        utf8_printf(pArg->out, "%s\n", zStmtSql ? zStmtSql : zSql);
      }

      /* Show the EXPLAIN QUERY PLAN if .eqp is on */
      if( pArg && pArg->autoEQP ){
        sqlite3_stmt *pExplain;


        char *zEQP = sqlite3_mprintf("EXPLAIN QUERY PLAN %s",
                                     sqlite3_sql(pStmt));
        rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
        if( rc==SQLITE_OK ){
          while( sqlite3_step(pExplain)==SQLITE_ROW ){
            raw_printf(pArg->out,"--EQP-- %d,",sqlite3_column_int(pExplain, 0));
            raw_printf(pArg->out,"%d,", sqlite3_column_int(pExplain, 1));
            raw_printf(pArg->out,"%d,", sqlite3_column_int(pExplain, 2));
            utf8_printf(pArg->out,"%s\n", sqlite3_column_text(pExplain, 3));
          }
        }
        sqlite3_finalize(pExplain);
        sqlite3_free(zEQP);














      }

      if( pArg ){
        pArg->cMode = pArg->mode;
        if( pArg->autoExplain
         && sqlite3_column_count(pStmt)==8
         && sqlite3_strlike("%EXPLAIN%", sqlite3_sql(pStmt),0)==0
        ){
          pArg->cMode = MODE_Explain;
        }

        /* If the shell is currently in ".explain" mode, gather the extra
        ** data required to add indents to the output.*/
        if( pArg->cMode==MODE_Explain ){
          explain_data_prepare(pArg, pStmt);
        }
      }

      /* perform the first step.  this will tell us if we
      ** have a result set or not and how wide it is.
      */
      rc = sqlite3_step(pStmt);
      /* if we have a result set... */
      if( SQLITE_ROW == rc ){
        /* if we have a callback... */
        if( xCallback ){
          /* allocate space for col name ptr, value ptr, and type */
          int nCol = sqlite3_column_count(pStmt);
          void *pData = sqlite3_malloc64(3*nCol*sizeof(const char*) + 1);
          if( !pData ){
            rc = SQLITE_NOMEM;
          }else{
            char **azCols = (char **)pData;      /* Names of result columns */
            char **azVals = &azCols[nCol];       /* Results */
            int *aiTypes = (int *)&azVals[nCol]; /* Result types */
            int i, x;
            assert(sizeof(int) <= sizeof(char *));
            /* save off ptrs to column names */
            for(i=0; i<nCol; i++){
              azCols[i] = (char *)sqlite3_column_name(pStmt, i);
            }
            do{
              /* extract the data and data types */
              for(i=0; i<nCol; i++){
                aiTypes[i] = x = sqlite3_column_type(pStmt, i);
                if( x==SQLITE_BLOB && pArg && pArg->cMode==MODE_Insert ){
                  azVals[i] = "";
                }else{
                  azVals[i] = (char*)sqlite3_column_text(pStmt, i);
                }
                if( !azVals[i] && (aiTypes[i]!=SQLITE_NULL) ){
                  rc = SQLITE_NOMEM;
                  break; /* from for */
                }
              } /* end for */

              /* if data and types extracted successfully... */
              if( SQLITE_ROW == rc ){
                /* call the supplied callback with the result row data */
                if( xCallback(pArg, nCol, azVals, azCols, aiTypes) ){
                  rc = SQLITE_ABORT;
                }else{
                  rc = sqlite3_step(pStmt);
                }
              }
            } while( SQLITE_ROW == rc );
            sqlite3_free(pData);
          }
        }else{
          do{
            rc = sqlite3_step(pStmt);
          } while( rc == SQLITE_ROW );
        }
      }

      explain_data_delete(pArg);

      /* print usage stats if stats on */
      if( pArg && pArg->statsOn ){
        display_stats(db, pArg, 0);
      }

................................................................................
  ".clone NEWDB           Clone data into NEWDB from the existing database\n"
  ".databases             List names and files of attached databases\n"
  ".dbinfo ?DB?           Show status information about the database\n"
  ".dump ?TABLE? ...      Dump the database in an SQL text format\n"
  "                         If TABLE specified, only dump tables matching\n"
  "                         LIKE pattern TABLE.\n"
  ".echo on|off           Turn command echo on or off\n"
  ".eqp on|off            Enable or disable automatic EXPLAIN QUERY PLAN\n"
  ".exit                  Exit this program\n"
  ".explain ?on|off|auto? Turn EXPLAIN output mode on or off or to automatic\n"
  ".fullschema            Show schema and the content of sqlite_stat tables\n"
  ".headers on|off        Turn display of headers on or off\n"
  ".help                  Show this message\n"
  ".import FILE TABLE     Import data from FILE into TABLE\n"
  ".indexes ?TABLE?       Show names of all indexes\n"
  "                         If TABLE specified, only show indexes for tables\n"
  "                         matching LIKE pattern TABLE.\n"
#ifdef SQLITE_ENABLE_IOTRACE
................................................................................
  ".print STRING...       Print literal STRING\n"
  ".prompt MAIN CONTINUE  Replace the standard prompts\n"
  ".quit                  Exit this program\n"
  ".read FILENAME         Execute SQL in FILENAME\n"
  ".restore ?DB? FILE     Restore content of DB (default \"main\") from FILE\n"
  ".save FILE             Write in-memory database into FILE\n"
  ".scanstats on|off      Turn sqlite3_stmt_scanstatus() metrics on or off\n"
  ".schema ?TABLE?        Show the CREATE statements\n"
  "                         If TABLE specified, only show tables matching\n"
  "                         LIKE pattern TABLE.\n"
  ".separator COL ?ROW?   Change the column separator and optionally the row\n"
  "                         separator for both the output mode and .import\n"
#if defined(SQLITE_ENABLE_SESSION)
  ".session CMD ...       Create or control sessions\n"
#endif
  ".shell CMD ARGS...     Run CMD ARGS... in a system shell\n"
  ".show                  Show the current values for various settings\n"
................................................................................
/*
** Print an out-of-memory message to stderr and return 1.
*/
static int shellNomemError(void){
  raw_printf(stderr, "Error: out of memory\n");
  return 1;
}












/*
** If an input line begins with "." then invoke this routine to
** process that line.
**
** Return 1 on error, 2 to exit, and 0 otherwise.
*/
................................................................................
      raw_printf(stderr, "Usage: .echo on|off\n");
      rc = 1;
    }
  }else

  if( c=='e' && strncmp(azArg[0], "eqp", n)==0 ){
    if( nArg==2 ){



      p->autoEQP = booleanValue(azArg[1]);

    }else{
      raw_printf(stderr, "Usage: .eqp on|off\n");
      rc = 1;
    }
  }else

  if( c=='e' && strncmp(azArg[0], "exit", n)==0 ){
    if( nArg>1 && (rc = (int)integerValue(azArg[1]))!=0 ) exit(rc);
    rc = 2;
................................................................................
    }
  }else

  if( c=='f' && strncmp(azArg[0], "fullschema", n)==0 ){
    ShellState data;
    char *zErrMsg = 0;
    int doStats = 0;
    if( nArg!=1 ){
      raw_printf(stderr, "Usage: .fullschema\n");
      rc = 1;
      goto meta_command_exit;
    }
    open_db(p, 0);
    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.cMode = data.mode = MODE_Semi;










    rc = sqlite3_exec(p->db,
       "SELECT sql FROM"
       "  (SELECT sql sql, type type, tbl_name tbl_name, name name, rowid x"
       "     FROM sqlite_master UNION ALL"
       "   SELECT sql, type, tbl_name, name, rowid FROM sqlite_temp_master) "
       "WHERE type!='meta' AND sql NOTNULL AND name NOT LIKE 'sqlite_%' "
       "ORDER BY rowid",
................................................................................
  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){
    ShellState data;
    char *zErrMsg = 0;
    open_db(p, 0);
    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.cMode = data.mode = MODE_Semi;



    if( nArg==2 ){


      int i;
      for(i=0; azArg[1][i]; i++) azArg[1][i] = ToLower(azArg[1][i]);
      if( strcmp(azArg[1],"sqlite_master")==0 ){
        char *new_argv[2], *new_colv[2];
        new_argv[0] = "CREATE TABLE sqlite_master (\n"
                      "  type text,\n"
                      "  name text,\n"
................................................................................
         "     FROM sqlite_master UNION ALL"
         "   SELECT sql, type, tbl_name, name, rowid FROM sqlite_temp_master) "
         "WHERE type!='meta' AND sql NOTNULL AND name NOT LIKE 'sqlite_%' "
         "ORDER BY rowid",
         callback, &data, &zErrMsg
      );
    }else{
      raw_printf(stderr, "Usage: .schema ?LIKE-PATTERN?\n");
      rc = 1;
      goto meta_command_exit;
    }
    if( zErrMsg ){
      utf8_printf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
      rc = 1;
................................................................................
    }else{
      rc = 0;
    }
  }else

#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_SELECTTRACE)
  if( c=='s' && n==11 && strncmp(azArg[0], "selecttrace", n)==0 ){
    extern int sqlite3SelectTrace;
    sqlite3SelectTrace = integerValue(azArg[1]);
  }else
#endif

#if defined(SQLITE_ENABLE_SESSION)
  if( c=='s' && strncmp(azArg[0],"session",n)==0 && n>=3 ){
    OpenSession *pSession = &p->aSession[0];
................................................................................
    }
    x = system(zCmd);
    sqlite3_free(zCmd);
    if( x ) raw_printf(stderr, "System command returns %d\n", x);
  }else

  if( c=='s' && strncmp(azArg[0], "show", n)==0 ){

    int i;
    if( nArg!=1 ){
      raw_printf(stderr, "Usage: .show\n");
      rc = 1;
      goto meta_command_exit;
    }
    utf8_printf(p->out, "%12.12s: %s\n","echo", p->echoOn ? "on" : "off");
    utf8_printf(p->out, "%12.12s: %s\n","eqp", p->autoEQP ? "on" : "off");
    utf8_printf(p->out, "%12.12s: %s\n","explain",
         p->mode==MODE_Explain ? "on" : p->autoExplain ? "auto" : "off");
    utf8_printf(p->out,"%12.12s: %s\n","headers", p->showHeader ? "on" : "off");
    utf8_printf(p->out, "%12.12s: %s\n","mode", modeDescr[p->mode]);
    utf8_printf(p->out, "%12.12s: ", "nullvalue");
      output_c_string(p->out, p->nullValue);
      raw_printf(p->out, "\n");
    utf8_printf(p->out,"%12.12s: %s\n","output",
            strlen30(p->outfile) ? p->outfile : "stdout");
    utf8_printf(p->out,"%12.12s: ", "colseparator");
      output_c_string(p->out, p->colSeparator);
      raw_printf(p->out, "\n");
    utf8_printf(p->out,"%12.12s: ", "rowseparator");
      output_c_string(p->out, p->rowSeparator);
      raw_printf(p->out, "\n");
    utf8_printf(p->out, "%12.12s: %s\n","stats", p->statsOn ? "on" : "off");
    utf8_printf(p->out, "%12.12s: ", "width");
    for (i=0;i<(int)ArraySize(p->colWidth) && p->colWidth[i] != 0;i++) {
      raw_printf(p->out, "%d ", p->colWidth[i]);
    }
    raw_printf(p->out, "\n");
  }else

................................................................................
        sqlite3_free(zVfsName);
      }
    }
  }else

#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_WHERETRACE)
  if( c=='w' && strncmp(azArg[0], "wheretrace", n)==0 ){
    extern int sqlite3WhereTrace;
    sqlite3WhereTrace = nArg>=2 ? booleanValue(azArg[1]) : 0xff;
  }else
#endif

  if( c=='w' && strncmp(azArg[0], "width", n)==0 ){
    int j;
    assert( nArg<=ArraySize(azArg) );
................................................................................
      data.showHeader = 1;
    }else if( strcmp(z,"-noheader")==0 ){
      data.showHeader = 0;
    }else if( strcmp(z,"-echo")==0 ){
      data.echoOn = 1;
    }else if( strcmp(z,"-eqp")==0 ){
      data.autoEQP = 1;


    }else if( strcmp(z,"-stats")==0 ){
      data.statsOn = 1;
    }else if( strcmp(z,"-scanstats")==0 ){
      data.scanstatsOn = 1;
    }else if( strcmp(z,"-backslash")==0 ){
      /* Undocumented command-line option: -backslash
      ** Causes C-style backslash escapes to be evaluated in SQL statements

#define MODE_Semi     3  /* Same as MODE_List but append ";" to each line */
#define MODE_Html     4  /* Generate an XHTML table */
#define MODE_Insert   5  /* Generate SQL "insert" statements */
#define MODE_Tcl      6  /* Generate ANSI-C or TCL quoted elements */
#define MODE_Csv      7  /* Quote strings, numbers are plain */
#define MODE_Explain  8  /* Like MODE_Column, but do not truncate data */
#define MODE_Ascii    9  /* Use ASCII unit and record separators (0x1F/0x1E) */
#define MODE_Pretty  10  /* Pretty-print schemas */

static const char *modeDescr[] = {
  "line",
  "column",
  "list",
  "semi",
  "html",
  "insert",
  "tcl",
  "csv",
  "explain",
  "ascii",
  "prettyprint",
};

/*
** These are the column/row/line separators used by the various
** import/export modes.
*/
#define SEP_Column    "|"
................................................................................
          utf8_printf(p->out,"%-*.*s%s",w,w,
              azArg[i] ? azArg[i] : p->nullValue,
              i==nArg-1 ? rowSep : "  ");
        }
      }
      break;
    }
    case MODE_Semi: {   /* .schema and .fullschema output */
      utf8_printf(p->out, "%s;\n", azArg[0]);
      break;
    }
    case MODE_Pretty: {  /* .schema and .fullschema with --indent */
      char *z;
      int j;
      int nParen = 0;
      char cEnd = 0;
      char c;
      int nLine = 0;
      assert( nArg==1 );
      if( azArg[0]==0 ) break;
      if( sqlite3_strlike("CREATE VIEW%", azArg[0], 0)==0
       || sqlite3_strlike("CREATE TRIG%", azArg[0], 0)==0
      ){
        utf8_printf(p->out, "%s;\n", azArg[0]);
        break;
      }
      z = sqlite3_mprintf("%s", azArg[0]);
      j = 0;
      for(i=0; IsSpace(z[i]); i++){}
      for(; (c = z[i])!=0; i++){
        if( IsSpace(c) ){
          if( IsSpace(z[j-1]) || z[j-1]=='(' ) continue;
        }else if( (c=='(' || c==')') && j>0 && IsSpace(z[j-1]) ){
          j--;
        }
        z[j++] = c;
      }
      while( j>0 && IsSpace(z[j-1]) ){ j--; }
      z[j] = 0;
      if( strlen30(z)>=79 ){
        for(i=j=0; (c = z[i])!=0; i++){
          if( c==cEnd ){
            cEnd = 0;
          }else if( c=='"' || c=='\'' || c=='`' ){
            cEnd = c;
          }else if( c=='[' ){
            cEnd = ']';
          }else if( c=='(' ){
            nParen++;
          }else if( c==')' ){
            nParen--;
            if( nLine>0 && nParen==0 && j>0 ){
              utf8_printf(p->out, "%.*s\n", j, z);
              j = 0;
            }
          }
          z[j++] = c;
          if( nParen==1 && (c=='(' || c==',' || c=='\n') ){
            if( c=='\n' ) j--;
            utf8_printf(p->out, "%.*s\n  ", j, z);
            j = 0;
            nLine++;
            while( IsSpace(z[i+1]) ){ i++; }
          }
        }
        z[j] = 0;
      }
      utf8_printf(p->out, "%s;\n", z);
      sqlite3_free(z);
      break;
    }
    case MODE_List: {
      if( p->cnt++==0 && p->showHeader ){
        for(i=0; i<nArg; i++){
          utf8_printf(p->out,"%s%s",azCol[i],
                  i==nArg-1 ? p->rowSeparator : p->colSeparator);
        }
      }
................................................................................
      if( azArg==0 ) break;
      for(i=0; i<nArg; i++){
        char *z = azArg[i];
        if( z==0 ) z = p->nullValue;
        utf8_printf(p->out, "%s", z);
        if( i<nArg-1 ){
          utf8_printf(p->out, "%s", p->colSeparator);


        }else{
          utf8_printf(p->out, "%s", p->rowSeparator);
        }
      }
      break;
    }
    case MODE_Html: {
................................................................................

    if( str_in_array(zOp, azNext) ){
      for(i=p2op; i<iOp; i++) p->aiIndent[i] += 2;
    }
    if( str_in_array(zOp, azGoto) && p2op<p->nIndent
     && (abYield[p2op] || sqlite3_column_int(pSql, 2))
    ){
      for(i=p2op; i<iOp; i++) p->aiIndent[i] += 2;
    }
  }

  p->iIndent = 0;
  sqlite3_free(abYield);
  sqlite3_reset(pSql);
}
................................................................................
*/
static void explain_data_delete(ShellState *p){
  sqlite3_free(p->aiIndent);
  p->aiIndent = 0;
  p->nIndent = 0;
  p->iIndent = 0;
}

/*
** Disable and restore .wheretrace and .selecttrace settings.
*/
#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_SELECTTRACE)
extern int sqlite3SelectTrace;
static int savedSelectTrace;
#endif
#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_WHERETRACE)
extern int sqlite3WhereTrace;
static int savedWhereTrace;
#endif
static void disable_debug_trace_modes(void){
#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_SELECTTRACE)
  savedSelectTrace = sqlite3SelectTrace;
  sqlite3SelectTrace = 0;
#endif
#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_WHERETRACE)
  savedWhereTrace = sqlite3WhereTrace;
  sqlite3WhereTrace = 0;
#endif
}
static void restore_debug_trace_modes(void){
#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_SELECTTRACE)
  sqlite3SelectTrace = savedSelectTrace;
#endif
#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_WHERETRACE)
  sqlite3WhereTrace = savedWhereTrace;
#endif
}

/*
** Run a prepared statement
*/
static void exec_prepared_stmt(
  ShellState *pArg,                                /* Pointer to ShellState */
  sqlite3_stmt *pStmt,                             /* Statment to run */
  int (*xCallback)(void*,int,char**,char**,int*)   /* Callback function */
){
  int rc;

  /* perform the first step.  this will tell us if we
  ** have a result set or not and how wide it is.
  */
  rc = sqlite3_step(pStmt);
  /* if we have a result set... */
  if( SQLITE_ROW == rc ){
    /* if we have a callback... */
    if( xCallback ){
      /* allocate space for col name ptr, value ptr, and type */
      int nCol = sqlite3_column_count(pStmt);
      void *pData = sqlite3_malloc64(3*nCol*sizeof(const char*) + 1);
      if( !pData ){
        rc = SQLITE_NOMEM;
      }else{
        char **azCols = (char **)pData;      /* Names of result columns */
        char **azVals = &azCols[nCol];       /* Results */
        int *aiTypes = (int *)&azVals[nCol]; /* Result types */
        int i, x;
        assert(sizeof(int) <= sizeof(char *));
        /* save off ptrs to column names */
        for(i=0; i<nCol; i++){
          azCols[i] = (char *)sqlite3_column_name(pStmt, i);
        }
        do{
          /* extract the data and data types */
          for(i=0; i<nCol; i++){
            aiTypes[i] = x = sqlite3_column_type(pStmt, i);
            if( x==SQLITE_BLOB && pArg && pArg->cMode==MODE_Insert ){
              azVals[i] = "";
            }else{
              azVals[i] = (char*)sqlite3_column_text(pStmt, i);
            }
            if( !azVals[i] && (aiTypes[i]!=SQLITE_NULL) ){
              rc = SQLITE_NOMEM;
              break; /* from for */
            }
          } /* end for */

          /* if data and types extracted successfully... */
          if( SQLITE_ROW == rc ){
            /* call the supplied callback with the result row data */
            if( xCallback(pArg, nCol, azVals, azCols, aiTypes) ){
              rc = SQLITE_ABORT;
            }else{
              rc = sqlite3_step(pStmt);
            }
          }
        } while( SQLITE_ROW == rc );
        sqlite3_free(pData);
      }
    }else{
      do{
        rc = sqlite3_step(pStmt);
      } while( rc == SQLITE_ROW );
    }
  }
}

/*
** Execute a statement or set of statements.  Print
** any result rows/columns depending on the current mode
** set via the supplied callback.
**
** This is very similar to SQLite's built-in sqlite3_exec()
................................................................................
  const char *zLeftover;          /* Tail of unprocessed SQL */

  if( pzErrMsg ){
    *pzErrMsg = NULL;
  }

  while( zSql[0] && (SQLITE_OK == rc) ){
    static const char *zStmtSql;
    rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zLeftover);
    if( SQLITE_OK != rc ){
      if( pzErrMsg ){
        *pzErrMsg = save_err_msg(db);
      }
    }else{
      if( !pStmt ){
        /* this happens for a comment or white-space */
        zSql = zLeftover;
        while( IsSpace(zSql[0]) ) zSql++;
        continue;
      }
      zStmtSql = sqlite3_sql(pStmt);
      while( IsSpace(zStmtSql[0]) ) zStmtSql++;

      /* save off the prepared statment handle and reset row count */
      if( pArg ){
        pArg->pStmt = pStmt;
        pArg->cnt = 0;
      }

      /* echo the sql statement if echo on */
      if( pArg && pArg->echoOn ){

        utf8_printf(pArg->out, "%s\n", zStmtSql ? zStmtSql : zSql);
      }

      /* Show the EXPLAIN QUERY PLAN if .eqp is on */
      if( pArg && pArg->autoEQP && sqlite3_strlike("EXPLAIN%",zStmtSql,0)!=0 ){
        sqlite3_stmt *pExplain;
        char *zEQP;
        disable_debug_trace_modes();
        zEQP = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", zStmtSql);

        rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
        if( rc==SQLITE_OK ){
          while( sqlite3_step(pExplain)==SQLITE_ROW ){
            raw_printf(pArg->out,"--EQP-- %d,",sqlite3_column_int(pExplain, 0));
            raw_printf(pArg->out,"%d,", sqlite3_column_int(pExplain, 1));
            raw_printf(pArg->out,"%d,", sqlite3_column_int(pExplain, 2));
            utf8_printf(pArg->out,"%s\n", sqlite3_column_text(pExplain, 3));
          }
        }
        sqlite3_finalize(pExplain);
        sqlite3_free(zEQP);
        if( pArg->autoEQP>=2 ){
          /* Also do an EXPLAIN for ".eqp full" mode */
          zEQP = sqlite3_mprintf("EXPLAIN %s", zStmtSql);
          rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
          if( rc==SQLITE_OK ){
            pArg->cMode = MODE_Explain;
            explain_data_prepare(pArg, pExplain);
            exec_prepared_stmt(pArg, pExplain, xCallback);
            explain_data_delete(pArg);
          }
          sqlite3_finalize(pExplain);
          sqlite3_free(zEQP);
        }
        restore_debug_trace_modes();
      }

      if( pArg ){
        pArg->cMode = pArg->mode;
        if( pArg->autoExplain
         && sqlite3_column_count(pStmt)==8
         && sqlite3_strlike("EXPLAIN%", zStmtSql,0)==0
        ){
          pArg->cMode = MODE_Explain;
        }

        /* If the shell is currently in ".explain" mode, gather the extra
        ** data required to add indents to the output.*/
        if( pArg->cMode==MODE_Explain ){
          explain_data_prepare(pArg, pStmt);
        }
      }

      exec_prepared_stmt(pArg, pStmt, xCallback);
























































      explain_data_delete(pArg);

      /* print usage stats if stats on */
      if( pArg && pArg->statsOn ){
        display_stats(db, pArg, 0);
      }

................................................................................
  ".clone NEWDB           Clone data into NEWDB from the existing database\n"
  ".databases             List names and files of attached databases\n"
  ".dbinfo ?DB?           Show status information about the database\n"
  ".dump ?TABLE? ...      Dump the database in an SQL text format\n"
  "                         If TABLE specified, only dump tables matching\n"
  "                         LIKE pattern TABLE.\n"
  ".echo on|off           Turn command echo on or off\n"
  ".eqp on|off|full       Enable or disable automatic EXPLAIN QUERY PLAN\n"
  ".exit                  Exit this program\n"
  ".explain ?on|off|auto? Turn EXPLAIN output mode on or off or to automatic\n"
  ".fullschema ?--indent? Show schema and the content of sqlite_stat tables\n"
  ".headers on|off        Turn display of headers on or off\n"
  ".help                  Show this message\n"
  ".import FILE TABLE     Import data from FILE into TABLE\n"
  ".indexes ?TABLE?       Show names of all indexes\n"
  "                         If TABLE specified, only show indexes for tables\n"
  "                         matching LIKE pattern TABLE.\n"
#ifdef SQLITE_ENABLE_IOTRACE
................................................................................
  ".print STRING...       Print literal STRING\n"
  ".prompt MAIN CONTINUE  Replace the standard prompts\n"
  ".quit                  Exit this program\n"
  ".read FILENAME         Execute SQL in FILENAME\n"
  ".restore ?DB? FILE     Restore content of DB (default \"main\") from FILE\n"
  ".save FILE             Write in-memory database into FILE\n"
  ".scanstats on|off      Turn sqlite3_stmt_scanstatus() metrics on or off\n"
  ".schema ?PATTERN?      Show the CREATE statements matching PATTERN\n"

  "                          Add --indent for pretty-printing\n"
  ".separator COL ?ROW?   Change the column separator and optionally the row\n"
  "                         separator for both the output mode and .import\n"
#if defined(SQLITE_ENABLE_SESSION)
  ".session CMD ...       Create or control sessions\n"
#endif
  ".shell CMD ARGS...     Run CMD ARGS... in a system shell\n"
  ".show                  Show the current values for various settings\n"
................................................................................
/*
** Print an out-of-memory message to stderr and return 1.
*/
static int shellNomemError(void){
  raw_printf(stderr, "Error: out of memory\n");
  return 1;
}

/*
** Compare the string as a command-line option with either one or two
** initial "-" characters.
*/
static int optionMatch(const char *zStr, const char *zOpt){
  if( zStr[0]!='-' ) return 0;
  zStr++;
  if( zStr[0]=='-' ) zStr++;
  return strcmp(zStr, zOpt)==0;
}

/*
** If an input line begins with "." then invoke this routine to
** process that line.
**
** Return 1 on error, 2 to exit, and 0 otherwise.
*/
................................................................................
      raw_printf(stderr, "Usage: .echo on|off\n");
      rc = 1;
    }
  }else

  if( c=='e' && strncmp(azArg[0], "eqp", n)==0 ){
    if( nArg==2 ){
      if( strcmp(azArg[1],"full")==0 ){
        p->autoEQP = 2;
      }else{
        p->autoEQP = booleanValue(azArg[1]);
      }
    }else{
      raw_printf(stderr, "Usage: .eqp on|off|full\n");
      rc = 1;
    }
  }else

  if( c=='e' && strncmp(azArg[0], "exit", n)==0 ){
    if( nArg>1 && (rc = (int)integerValue(azArg[1]))!=0 ) exit(rc);
    rc = 2;
................................................................................
    }
  }else

  if( c=='f' && strncmp(azArg[0], "fullschema", n)==0 ){
    ShellState data;
    char *zErrMsg = 0;
    int doStats = 0;






    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.cMode = data.mode = MODE_Semi;
    if( nArg==2 && optionMatch(azArg[1], "indent") ){
      data.cMode = data.mode = MODE_Pretty;
      nArg = 1;
    }
    if( nArg!=1 ){
      raw_printf(stderr, "Usage: .fullschema ?--indent?\n");
      rc = 1;
      goto meta_command_exit;
    }
    open_db(p, 0);
    rc = sqlite3_exec(p->db,
       "SELECT sql FROM"
       "  (SELECT sql sql, type type, tbl_name tbl_name, name name, rowid x"
       "     FROM sqlite_master UNION ALL"
       "   SELECT sql, type, tbl_name, name, rowid FROM sqlite_temp_master) "
       "WHERE type!='meta' AND sql NOTNULL AND name NOT LIKE 'sqlite_%' "
       "ORDER BY rowid",
................................................................................
  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){
    ShellState data;
    char *zErrMsg = 0;
    open_db(p, 0);
    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.cMode = data.mode = MODE_Semi;
    if( nArg>=2 && optionMatch(azArg[1], "indent") ){
      data.cMode = data.mode = MODE_Pretty;
      nArg--;
      if( nArg==2 ) azArg[1] = azArg[2];
    }
    if( nArg==2 && azArg[1][0]!='-' ){
      int i;
      for(i=0; azArg[1][i]; i++) azArg[1][i] = ToLower(azArg[1][i]);
      if( strcmp(azArg[1],"sqlite_master")==0 ){
        char *new_argv[2], *new_colv[2];
        new_argv[0] = "CREATE TABLE sqlite_master (\n"
                      "  type text,\n"
                      "  name text,\n"
................................................................................
         "     FROM sqlite_master UNION ALL"
         "   SELECT sql, type, tbl_name, name, rowid FROM sqlite_temp_master) "
         "WHERE type!='meta' AND sql NOTNULL AND name NOT LIKE 'sqlite_%' "
         "ORDER BY rowid",
         callback, &data, &zErrMsg
      );
    }else{
      raw_printf(stderr, "Usage: .schema ?--indent? ?LIKE-PATTERN?\n");
      rc = 1;
      goto meta_command_exit;
    }
    if( zErrMsg ){
      utf8_printf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
      rc = 1;
................................................................................
    }else{
      rc = 0;
    }
  }else

#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_SELECTTRACE)
  if( c=='s' && n==11 && strncmp(azArg[0], "selecttrace", n)==0 ){

    sqlite3SelectTrace = integerValue(azArg[1]);
  }else
#endif

#if defined(SQLITE_ENABLE_SESSION)
  if( c=='s' && strncmp(azArg[0],"session",n)==0 && n>=3 ){
    OpenSession *pSession = &p->aSession[0];
................................................................................
    }
    x = system(zCmd);
    sqlite3_free(zCmd);
    if( x ) raw_printf(stderr, "System command returns %d\n", x);
  }else

  if( c=='s' && strncmp(azArg[0], "show", n)==0 ){
    static const char *azBool[] = { "off", "on", "full", "unk" };
    int i;
    if( nArg!=1 ){
      raw_printf(stderr, "Usage: .show\n");
      rc = 1;
      goto meta_command_exit;
    }
    utf8_printf(p->out, "%12.12s: %s\n","echo", azBool[p->echoOn!=0]);
    utf8_printf(p->out, "%12.12s: %s\n","eqp", azBool[p->autoEQP&3]);
    utf8_printf(p->out, "%12.12s: %s\n","explain",
         p->mode==MODE_Explain ? "on" : p->autoExplain ? "auto" : "off");
    utf8_printf(p->out,"%12.12s: %s\n","headers", azBool[p->showHeader!=0]);
    utf8_printf(p->out, "%12.12s: %s\n","mode", modeDescr[p->mode]);
    utf8_printf(p->out, "%12.12s: ", "nullvalue");
      output_c_string(p->out, p->nullValue);
      raw_printf(p->out, "\n");
    utf8_printf(p->out,"%12.12s: %s\n","output",
            strlen30(p->outfile) ? p->outfile : "stdout");
    utf8_printf(p->out,"%12.12s: ", "colseparator");
      output_c_string(p->out, p->colSeparator);
      raw_printf(p->out, "\n");
    utf8_printf(p->out,"%12.12s: ", "rowseparator");
      output_c_string(p->out, p->rowSeparator);
      raw_printf(p->out, "\n");
    utf8_printf(p->out, "%12.12s: %s\n","stats", azBool[p->statsOn!=0]);
    utf8_printf(p->out, "%12.12s: ", "width");
    for (i=0;i<(int)ArraySize(p->colWidth) && p->colWidth[i] != 0;i++) {
      raw_printf(p->out, "%d ", p->colWidth[i]);
    }
    raw_printf(p->out, "\n");
  }else

................................................................................
        sqlite3_free(zVfsName);
      }
    }
  }else

#if defined(SQLITE_DEBUG) && defined(SQLITE_ENABLE_WHERETRACE)
  if( c=='w' && strncmp(azArg[0], "wheretrace", n)==0 ){

    sqlite3WhereTrace = nArg>=2 ? booleanValue(azArg[1]) : 0xff;
  }else
#endif

  if( c=='w' && strncmp(azArg[0], "width", n)==0 ){
    int j;
    assert( nArg<=ArraySize(azArg) );
................................................................................
      data.showHeader = 1;
    }else if( strcmp(z,"-noheader")==0 ){
      data.showHeader = 0;
    }else if( strcmp(z,"-echo")==0 ){
      data.echoOn = 1;
    }else if( strcmp(z,"-eqp")==0 ){
      data.autoEQP = 1;
    }else if( strcmp(z,"-eqpfull")==0 ){
      data.autoEQP = 2;
    }else if( strcmp(z,"-stats")==0 ){
      data.statsOn = 1;
    }else if( strcmp(z,"-scanstats")==0 ){
      data.scanstatsOn = 1;
    }else if( strcmp(z,"-backslash")==0 ){
      /* Undocumented command-line option: -backslash
      ** Causes C-style backslash escapes to be evaluated in SQL statements

*************************************************************************
** Internal interface definitions for SQLite.
**
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_




























/*
** Make sure that rand_s() is available on Windows systems with MSVC 2005
** or higher.
*/
#if defined(_MSC_VER) && _MSC_VER>=1400
#  define _CRT_RAND_S
#endif
................................................................................
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.13.0"
#define SQLITE_VERSION_NUMBER 3013000
#define SQLITE_SOURCE_ID      "2016-04-07 21:14:35 87aa9357fbe6749bae60e30af54ca16e48678802"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** positive to enable fts3_tokenizer() or negative to leave the setting
** unchanged.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether fts3_tokenizer is disabled or enabled
** following this call.  The second parameter may be a NULL pointer, in
** which case the new setting is not reported back. </dd>
**

















** </dl>
*/
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */



/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
................................................................................
** ^If an error occurs and pzErrMsg is not 0, then the
** [sqlite3_load_extension()] interface shall attempt to
** fill *pzErrMsg with error message text stored in memory
** obtained from [sqlite3_malloc()]. The calling function
** should free this memory by calling [sqlite3_free()].
**
** ^Extension loading must be enabled using
** [sqlite3_enable_load_extension()] prior to calling this API,


** otherwise an error will be returned.







**
** See also the [load_extension() SQL function].
*/
SQLITE_API int SQLITE_STDCALL sqlite3_load_extension(
  sqlite3 *db,          /* Load the extension into this database connection */
  const char *zFile,    /* Name of the shared library containing extension */
  const char *zProc,    /* Entry point.  Derived from zFile if 0 */
................................................................................
** [extension loading] while evaluating user-entered SQL, the following API
** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
**
** ^Extension loading is off by default.
** ^Call the sqlite3_enable_load_extension() routine with onoff==1
** to turn extension loading on and call it with onoff==0 to turn
** it back off again.











*/
SQLITE_API int SQLITE_STDCALL sqlite3_enable_load_extension(sqlite3 *db, int onoff);

/*
** CAPI3REF: Automatically Load Statically Linked Extensions
**
** ^This interface causes the xEntryPoint() function to be invoked for
................................................................................
  sqlite3_snapshot **ppSnapshot
);

/*
** CAPI3REF: Start a read transaction on an historical snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_open(D,S,P)] interface attempts to move the
** read transaction that is currently open on schema S of

** [database connection] D so that it refers to historical [snapshot] P.

** ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK on success
** or an appropriate [error code] if it fails.
**
** ^In order to succeed, a call to [sqlite3_snapshot_open(D,S,P)] must be
** the first operation, apart from other sqlite3_snapshot_open() calls,
** following the [BEGIN] that starts a new read transaction.




** ^A [snapshot] will fail to open if it has been overwritten by a 
** [checkpoint].
** ^A [snapshot] will fail to open if the database connection D has not
** previously completed at least one read operation against the database 






** file.  (Hint: Run "[PRAGMA application_id]" against a newly opened
** database connection in order to make it ready to use snapshots.)
**
** The [sqlite3_snapshot_open()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL int SQLITE_STDCALL sqlite3_snapshot_open(
  sqlite3 *db,
................................................................................
** The application must eventually free every [sqlite3_snapshot] object
** using this routine to avoid a memory leak.
**
** The [sqlite3_snapshot_free()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL void SQLITE_STDCALL sqlite3_snapshot_free(sqlite3_snapshot*);




























/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
................................................................................
#define TK_EXISTS                          20
#define TK_TEMP                            21
#define TK_LP                              22
#define TK_RP                              23
#define TK_AS                              24
#define TK_WITHOUT                         25
#define TK_COMMA                           26




























#define TK_ID                              27
#define TK_INDEXED                         28
#define TK_ABORT                           29
#define TK_ACTION                          30
#define TK_AFTER                           31
#define TK_ANALYZE                         32
#define TK_ASC                             33
#define TK_ATTACH                          34
#define TK_BEFORE                          35
#define TK_BY                              36
#define TK_CASCADE                         37
#define TK_CAST                            38
#define TK_COLUMNKW                        39
#define TK_CONFLICT                        40
#define TK_DATABASE                        41
#define TK_DESC                            42
#define TK_DETACH                          43
#define TK_EACH                            44
#define TK_FAIL                            45
#define TK_FOR                             46
#define TK_IGNORE                          47
#define TK_INITIALLY                       48
#define TK_INSTEAD                         49
#define TK_LIKE_KW                         50
#define TK_MATCH                           51
#define TK_NO                              52
#define TK_KEY                             53
#define TK_OF                              54
#define TK_OFFSET                          55
#define TK_PRAGMA                          56
#define TK_RAISE                           57
#define TK_RECURSIVE                       58
#define TK_REPLACE                         59
#define TK_RESTRICT                        60
#define TK_ROW                             61
#define TK_TRIGGER                         62
#define TK_VACUUM                          63
#define TK_VIEW                            64
#define TK_VIRTUAL                         65
#define TK_WITH                            66
#define TK_REINDEX                         67
#define TK_RENAME                          68
#define TK_CTIME_KW                        69
#define TK_ANY                             70
#define TK_OR                              71
#define TK_AND                             72
#define TK_IS                              73
#define TK_BETWEEN                         74
#define TK_IN                              75
#define TK_ISNULL                          76
#define TK_NOTNULL                         77
#define TK_NE                              78
#define TK_EQ                              79
#define TK_GT                              80
#define TK_LE                              81
#define TK_LT                              82
#define TK_GE                              83
#define TK_ESCAPE                          84
#define TK_BITAND                          85
#define TK_BITOR                           86
#define TK_LSHIFT                          87
#define TK_RSHIFT                          88
#define TK_PLUS                            89
#define TK_MINUS                           90
#define TK_STAR                            91
#define TK_SLASH                           92
#define TK_REM                             93
#define TK_CONCAT                          94
#define TK_COLLATE                         95
#define TK_BITNOT                          96
#define TK_STRING                          97
#define TK_JOIN_KW                         98
#define TK_CONSTRAINT                      99
#define TK_DEFAULT                        100
#define TK_NULL                           101
#define TK_PRIMARY                        102
#define TK_UNIQUE                         103
................................................................................
** A single instruction of the virtual machine has an opcode
** and as many as three operands.  The instruction is recorded
** as an instance of the following structure:
*/
struct VdbeOp {
  u8 opcode;          /* What operation to perform */
  signed char p4type; /* One of the P4_xxx constants for p4 */
  u8 opflags;         /* Mask of the OPFLG_* flags in opcodes.h */
  u8 p5;              /* Fifth parameter is an unsigned character */
  int p1;             /* First operand */
  int p2;             /* Second parameter (often the jump destination) */
  int p3;             /* The third parameter */
  union p4union {     /* fourth parameter */
    int i;                 /* Integer value if p4type==P4_INT32 */
    void *p;               /* Generic pointer */
................................................................................
#define OP_Checkpoint      8
#define OP_JournalMode     9
#define OP_Vacuum         10
#define OP_VFilter        11 /* synopsis: iplan=r[P3] zplan='P4'           */
#define OP_VUpdate        12 /* synopsis: data=r[P3@P2]                    */
#define OP_Goto           13
#define OP_Gosub          14
#define OP_Return         15
#define OP_InitCoroutine  16
#define OP_EndCoroutine   17
#define OP_Yield          18
#define OP_Not            19 /* same as TK_NOT, synopsis: r[P2]= !r[P1]    */
#define OP_HaltIfNull     20 /* synopsis: if r[P3]=null halt               */
#define OP_Halt           21
#define OP_Integer        22 /* synopsis: r[P2]=P1                         */
#define OP_Int64          23 /* synopsis: r[P2]=P4                         */
#define OP_String         24 /* synopsis: r[P2]='P4' (len=P1)              */
#define OP_Null           25 /* synopsis: r[P2..P3]=NULL                   */
#define OP_SoftNull       26 /* synopsis: r[P1]=NULL                       */
#define OP_Blob           27 /* synopsis: r[P2]=P4 (len=P1)                */
#define OP_Variable       28 /* synopsis: r[P2]=parameter(P1,P4)           */
#define OP_Move           29 /* synopsis: r[P2@P3]=r[P1@P3]                */
#define OP_Copy           30 /* synopsis: r[P2@P3+1]=r[P1@P3+1]            */
#define OP_SCopy          31 /* synopsis: r[P2]=r[P1]                      */
#define OP_IntCopy        32 /* synopsis: r[P2]=r[P1]                      */
#define OP_ResultRow      33 /* synopsis: output=r[P1@P2]                  */
#define OP_CollSeq        34
#define OP_Function0      35 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_Function       36 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_AddImm         37 /* synopsis: r[P1]=r[P1]+P2                   */
#define OP_MustBeInt      38
#define OP_RealAffinity   39
#define OP_Cast           40 /* synopsis: affinity(r[P1])                  */
#define OP_Permutation    41
#define OP_Compare        42 /* synopsis: r[P1@P3] <-> r[P2@P3]            */
#define OP_Jump           43
#define OP_Once           44
#define OP_If             45
#define OP_IfNot          46
#define OP_Column         47 /* synopsis: r[P3]=PX                         */
#define OP_Affinity       48 /* synopsis: affinity(r[P1@P2])               */
#define OP_MakeRecord     49 /* synopsis: r[P3]=mkrec(r[P1@P2])            */
#define OP_Count          50 /* synopsis: r[P2]=count()                    */
#define OP_ReadCookie     51
#define OP_SetCookie      52
#define OP_ReopenIdx      53 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenRead       54 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenWrite      55 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenAutoindex  56 /* synopsis: nColumn=P2                       */
#define OP_OpenEphemeral  57 /* synopsis: nColumn=P2                       */
#define OP_SorterOpen     58
#define OP_SequenceTest   59 /* synopsis: if( cursor[P1].ctr++ ) pc = P2   */
#define OP_OpenPseudo     60 /* synopsis: P3 columns in r[P2]              */
#define OP_Close          61
#define OP_ColumnsUsed    62
#define OP_SeekLT         63 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekLE         64 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGE         65 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGT         66 /* synopsis: key=r[P3@P4]                     */
#define OP_NoConflict     67 /* synopsis: key=r[P3@P4]                     */
#define OP_NotFound       68 /* synopsis: key=r[P3@P4]                     */
#define OP_Found          69 /* synopsis: key=r[P3@P4]                     */
#define OP_NotExists      70 /* synopsis: intkey=r[P3]                     */
#define OP_Or             71 /* same as TK_OR, synopsis: r[P3]=(r[P1] || r[P2]) */
#define OP_And            72 /* same as TK_AND, synopsis: r[P3]=(r[P1] && r[P2]) */
#define OP_Sequence       73 /* synopsis: r[P2]=cursor[P1].ctr++           */
#define OP_NewRowid       74 /* synopsis: r[P2]=rowid                      */
#define OP_Insert         75 /* synopsis: intkey=r[P3] data=r[P2]          */
#define OP_IsNull         76 /* same as TK_ISNULL, synopsis: if r[P1]==NULL goto P2 */
#define OP_NotNull        77 /* same as TK_NOTNULL, synopsis: if r[P1]!=NULL goto P2 */
#define OP_Ne             78 /* same as TK_NE, synopsis: if r[P1]!=r[P3] goto P2 */
#define OP_Eq             79 /* same as TK_EQ, synopsis: if r[P1]==r[P3] goto P2 */
#define OP_Gt             80 /* same as TK_GT, synopsis: if r[P1]>r[P3] goto P2 */
#define OP_Le             81 /* same as TK_LE, synopsis: if r[P1]<=r[P3] goto P2 */
#define OP_Lt             82 /* same as TK_LT, synopsis: if r[P1]<r[P3] goto P2 */
#define OP_Ge             83 /* same as TK_GE, synopsis: if r[P1]>=r[P3] goto P2 */
#define OP_InsertInt      84 /* synopsis: intkey=P3 data=r[P2]             */
#define OP_BitAnd         85 /* same as TK_BITAND, synopsis: r[P3]=r[P1]&r[P2] */
#define OP_BitOr          86 /* same as TK_BITOR, synopsis: r[P3]=r[P1]|r[P2] */
#define OP_ShiftLeft      87 /* same as TK_LSHIFT, synopsis: r[P3]=r[P2]<<r[P1] */
#define OP_ShiftRight     88 /* same as TK_RSHIFT, synopsis: r[P3]=r[P2]>>r[P1] */
#define OP_Add            89 /* same as TK_PLUS, synopsis: r[P3]=r[P1]+r[P2] */
#define OP_Subtract       90 /* same as TK_MINUS, synopsis: r[P3]=r[P2]-r[P1] */
#define OP_Multiply       91 /* same as TK_STAR, synopsis: r[P3]=r[P1]*r[P2] */
#define OP_Divide         92 /* same as TK_SLASH, synopsis: r[P3]=r[P2]/r[P1] */
#define OP_Remainder      93 /* same as TK_REM, synopsis: r[P3]=r[P2]%r[P1] */
#define OP_Concat         94 /* same as TK_CONCAT, synopsis: r[P3]=r[P2]+r[P1] */
#define OP_Delete         95
#define OP_BitNot         96 /* same as TK_BITNOT, synopsis: r[P1]= ~r[P1] */
#define OP_String8        97 /* same as TK_STRING, synopsis: r[P2]='P4'    */
#define OP_ResetCount     98
#define OP_SorterCompare  99 /* synopsis: if key(P1)!=trim(r[P3],P4) goto P2 */
#define OP_SorterData    100 /* synopsis: r[P2]=data                       */
#define OP_RowKey        101 /* synopsis: r[P2]=key                        */
#define OP_RowData       102 /* synopsis: r[P2]=data                       */
#define OP_Rowid         103 /* synopsis: r[P2]=rowid                      */
#define OP_NullRow       104
#define OP_Last          105
#define OP_SorterSort    106
#define OP_Sort          107
#define OP_Rewind        108
#define OP_SorterInsert  109
#define OP_IdxInsert     110 /* synopsis: key=r[P2]                        */
#define OP_IdxDelete     111 /* synopsis: key=r[P2@P3]                     */
#define OP_Seek          112 /* synopsis: Move P3 to P1.rowid              */
#define OP_IdxRowid      113 /* synopsis: r[P2]=rowid                      */
#define OP_IdxLE         114 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxGT         115 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxLT         116 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxGE         117 /* synopsis: key=r[P3@P4]                     */
#define OP_Destroy       118
#define OP_Clear         119
#define OP_ResetSorter   120
#define OP_CreateIndex   121 /* synopsis: r[P2]=root iDb=P1                */
#define OP_CreateTable   122 /* synopsis: r[P2]=root iDb=P1                */
#define OP_ParseSchema   123
#define OP_LoadAnalysis  124
#define OP_DropTable     125
#define OP_DropIndex     126
#define OP_DropTrigger   127
#define OP_IntegrityCk   128
#define OP_RowSetAdd     129 /* synopsis: rowset(P1)=r[P2]                 */
#define OP_RowSetRead    130 /* synopsis: r[P3]=rowset(P1)                 */
#define OP_RowSetTest    131 /* synopsis: if r[P3] in rowset(P1) goto P2   */
#define OP_Program       132
#define OP_Real          133 /* same as TK_FLOAT, synopsis: r[P2]=P4       */
#define OP_Param         134
#define OP_FkCounter     135 /* synopsis: fkctr[P1]+=P2                    */
#define OP_FkIfZero      136 /* synopsis: if fkctr[P1]==0 goto P2          */
#define OP_MemMax        137 /* synopsis: r[P1]=max(r[P1],r[P2])           */
#define OP_IfPos         138 /* synopsis: if r[P1]>0 then r[P1]-=P3, goto P2 */
#define OP_OffsetLimit   139 /* synopsis: if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1) */
#define OP_IfNotZero     140 /* synopsis: if r[P1]!=0 then r[P1]-=P3, goto P2 */
#define OP_DecrJumpZero  141 /* synopsis: if (--r[P1])==0 goto P2          */
#define OP_JumpZeroIncr  142 /* synopsis: if (r[P1]++)==0 ) goto P2        */
#define OP_AggStep0      143 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggStep       144 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggFinal      145 /* synopsis: accum=r[P1] N=P2                 */
#define OP_IncrVacuum    146
#define OP_Expire        147
#define OP_TableLock     148 /* synopsis: iDb=P1 root=P2 write=P3          */
#define OP_VBegin        149
#define OP_VCreate       150
#define OP_VDestroy      151
#define OP_VOpen         152
#define OP_VColumn       153 /* synopsis: r[P3]=vcolumn(P2)                */
#define OP_VNext         154
#define OP_VRename       155
#define OP_Pagecount     156
#define OP_MaxPgcnt      157
#define OP_Init          158 /* synopsis: Start at P2                      */
#define OP_CursorHint    159
#define OP_Noop          160
#define OP_Explain       161

/* Properties such as "out2" or "jump" that are specified in
** comments following the "case" for each opcode in the vdbe.c
** are encoded into bitvectors as follows:
*/
#define OPFLG_JUMP        0x01  /* jump:  P2 holds jmp target */
#define OPFLG_IN1         0x02  /* in1:   P1 is an input */
#define OPFLG_IN2         0x04  /* in2:   P2 is an input */
#define OPFLG_IN3         0x08  /* in3:   P3 is an input */
#define OPFLG_OUT2        0x10  /* out2:  P2 is an output */
#define OPFLG_OUT3        0x20  /* out3:  P3 is an output */
#define OPFLG_INITIALIZER {\
/*   0 */ 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,\
/*   8 */ 0x00, 0x10, 0x00, 0x01, 0x00, 0x01, 0x01, 0x02,\
/*  16 */ 0x01, 0x02, 0x03, 0x12, 0x08, 0x00, 0x10, 0x10,\
/*  24 */ 0x10, 0x10, 0x00, 0x10, 0x10, 0x00, 0x00, 0x10,\
/*  32 */ 0x10, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x02,\
/*  40 */ 0x02, 0x00, 0x00, 0x01, 0x01, 0x03, 0x03, 0x00,\
/*  48 */ 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,\
/*  56 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09,\
/*  64 */ 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x26,\
/*  72 */ 0x26, 0x10, 0x10, 0x00, 0x03, 0x03, 0x0b, 0x0b,\
/*  80 */ 0x0b, 0x0b, 0x0b, 0x0b, 0x00, 0x26, 0x26, 0x26,\
/*  88 */ 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x00,\

/*  96 */ 0x12, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,\
/* 104 */ 0x00, 0x01, 0x01, 0x01, 0x01, 0x04, 0x04, 0x00,\
/* 112 */ 0x00, 0x10, 0x01, 0x01, 0x01, 0x01, 0x10, 0x00,\
/* 120 */ 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 128 */ 0x00, 0x06, 0x23, 0x0b, 0x01, 0x10, 0x10, 0x00,\
/* 136 */ 0x01, 0x04, 0x03, 0x1a, 0x03, 0x03, 0x03, 0x00,\
/* 144 */ 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 152 */ 0x00, 0x00, 0x01, 0x00, 0x10, 0x10, 0x01, 0x00,\
/* 160 */ 0x00, 0x00,}









/************** End of opcodes.h *********************************************/
/************** Continuing where we left off in vdbe.h ***********************/

/*
** Prototypes for the VDBE interface.  See comments on the implementation
** for a description of what each of these routines does.
................................................................................
** Valid values for the second argument to sqlite3PagerLockingMode().
*/
#define PAGER_LOCKINGMODE_QUERY      -1
#define PAGER_LOCKINGMODE_NORMAL      0
#define PAGER_LOCKINGMODE_EXCLUSIVE   1

/*
** Numeric constants that encode the journalmode.  




*/
#define PAGER_JOURNALMODE_QUERY     (-1)  /* Query the value of journalmode */
#define PAGER_JOURNALMODE_DELETE      0   /* Commit by deleting journal file */
#define PAGER_JOURNALMODE_PERSIST     1   /* Commit by zeroing journal header */
#define PAGER_JOURNALMODE_OFF         2   /* Journal omitted.  */
#define PAGER_JOURNALMODE_TRUNCATE    3   /* Commit by truncating journal */
#define PAGER_JOURNALMODE_MEMORY      4   /* In-memory journal file */
................................................................................
** Flags that make up the mask passed to sqlite3PagerGet().
*/
#define PAGER_GET_NOCONTENT     0x01  /* Do not load data from disk */
#define PAGER_GET_READONLY      0x02  /* Read-only page is acceptable */

/*
** Flags for sqlite3PagerSetFlags()





*/
#define PAGER_SYNCHRONOUS_OFF       0x01  /* PRAGMA synchronous=OFF */
#define PAGER_SYNCHRONOUS_NORMAL    0x02  /* PRAGMA synchronous=NORMAL */
#define PAGER_SYNCHRONOUS_FULL      0x03  /* PRAGMA synchronous=FULL */
#define PAGER_SYNCHRONOUS_EXTRA     0x04  /* PRAGMA synchronous=EXTRA */
#define PAGER_SYNCHRONOUS_MASK      0x07  /* Mask for four values above */
#define PAGER_FULLFSYNC             0x08  /* PRAGMA fullfsync=ON */
................................................................................
SQLITE_PRIVATE PgHdr *sqlite3PcacheFetchFinish(PCache*, Pgno, sqlite3_pcache_page *pPage);
SQLITE_PRIVATE void sqlite3PcacheRelease(PgHdr*);

SQLITE_PRIVATE void sqlite3PcacheDrop(PgHdr*);         /* Remove page from cache */
SQLITE_PRIVATE void sqlite3PcacheMakeDirty(PgHdr*);    /* Make sure page is marked dirty */
SQLITE_PRIVATE void sqlite3PcacheMakeClean(PgHdr*);    /* Mark a single page as clean */
SQLITE_PRIVATE void sqlite3PcacheCleanAll(PCache*);    /* Mark all dirty list pages as clean */


/* Change a page number.  Used by incr-vacuum. */
SQLITE_PRIVATE void sqlite3PcacheMove(PgHdr*, Pgno);

/* Remove all pages with pgno>x.  Reset the cache if x==0 */
SQLITE_PRIVATE void sqlite3PcacheTruncate(PCache*, Pgno x);

................................................................................
#endif

SQLITE_PRIVATE void sqlite3PCacheSetDefault(void);

/* Return the header size */
SQLITE_PRIVATE int sqlite3HeaderSizePcache(void);
SQLITE_PRIVATE int sqlite3HeaderSizePcache1(void);




#endif /* _PCACHE_H_ */

/************** End of pcache.h **********************************************/
/************** Continuing where we left off in sqliteInt.h ******************/
/************** Include os.h in the middle of sqliteInt.h ********************/
/************** Begin file os.h **********************************************/
................................................................................
** Wrapper around OS specific sqlite3_os_init() function.
*/
SQLITE_PRIVATE int sqlite3OsInit(void);

/* 
** Functions for accessing sqlite3_file methods 
*/
SQLITE_PRIVATE int sqlite3OsClose(sqlite3_file*);
SQLITE_PRIVATE int sqlite3OsRead(sqlite3_file*, void*, int amt, i64 offset);
SQLITE_PRIVATE int sqlite3OsWrite(sqlite3_file*, const void*, int amt, i64 offset);
SQLITE_PRIVATE int sqlite3OsTruncate(sqlite3_file*, i64 size);
SQLITE_PRIVATE int sqlite3OsSync(sqlite3_file*, int);
SQLITE_PRIVATE int sqlite3OsFileSize(sqlite3_file*, i64 *pSize);
SQLITE_PRIVATE int sqlite3OsLock(sqlite3_file*, int);
SQLITE_PRIVATE int sqlite3OsUnlock(sqlite3_file*, int);
................................................................................
SQLITE_PRIVATE int sqlite3OsCurrentTimeInt64(sqlite3_vfs *, sqlite3_int64*);

/*
** Convenience functions for opening and closing files using 
** sqlite3_malloc() to obtain space for the file-handle structure.
*/
SQLITE_PRIVATE int sqlite3OsOpenMalloc(sqlite3_vfs *, const char *, sqlite3_file **, int,int*);
SQLITE_PRIVATE int sqlite3OsCloseFree(sqlite3_file *);

#endif /* _SQLITE_OS_H_ */

/************** End of os.h **************************************************/
/************** Continuing where we left off in sqliteInt.h ******************/
/************** Include mutex.h in the middle of sqliteInt.h *****************/
/************** Begin file mutex.h *******************************************/
................................................................................
** A macro to discover the encoding of a database.
*/
#define SCHEMA_ENC(db) ((db)->aDb[0].pSchema->enc)
#define ENC(db)        ((db)->enc)

/*
** Possible values for the sqlite3.flags.





*/
#define SQLITE_VdbeTrace      0x00000001  /* True to trace VDBE execution */
#define SQLITE_InternChanges  0x00000002  /* Uncommitted Hash table changes */
#define SQLITE_FullColNames   0x00000004  /* Show full column names on SELECT */
#define SQLITE_FullFSync      0x00000008  /* Use full fsync on the backend */
#define SQLITE_CkptFullFSync  0x00000010  /* Use full fsync for checkpoint */
#define SQLITE_CacheSpill     0x00000020  /* OK to spill pager cache */
................................................................................
#define SQLITE_RecoveryMode   0x00010000  /* Ignore schema errors */
#define SQLITE_ReverseOrder   0x00020000  /* Reverse unordered SELECTs */
#define SQLITE_RecTriggers    0x00040000  /* Enable recursive triggers */
#define SQLITE_ForeignKeys    0x00080000  /* Enforce foreign key constraints  */
#define SQLITE_AutoIndex      0x00100000  /* Enable automatic indexes */
#define SQLITE_PreferBuiltin  0x00200000  /* Preference to built-in funcs */
#define SQLITE_LoadExtension  0x00400000  /* Enable load_extension */

#define SQLITE_EnableTrigger  0x00800000  /* True to enable triggers */
#define SQLITE_DeferFKs       0x01000000  /* Defer all FK constraints */
#define SQLITE_QueryOnly      0x02000000  /* Disable database changes */
#define SQLITE_VdbeEQP        0x04000000  /* Debug EXPLAIN QUERY PLAN */
#define SQLITE_Vacuum         0x08000000  /* Currently in a VACUUM */
#define SQLITE_CellSizeCk     0x10000000  /* Check btree cell sizes on load */
#define SQLITE_Fts3Tokenizer  0x20000000  /* Enable fts3_tokenizer(2) */


/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/
................................................................................
};

/*
** Possible values for FuncDef.flags.  Note that the _LENGTH and _TYPEOF
** values must correspond to OPFLAG_LENGTHARG and OPFLAG_TYPEOFARG.  And
** SQLITE_FUNC_CONSTANT must be the same as SQLITE_DETERMINISTIC.  There
** are assert() statements in the code to verify this.







*/
#define SQLITE_FUNC_ENCMASK  0x0003 /* SQLITE_UTF8, SQLITE_UTF16BE or UTF16LE */
#define SQLITE_FUNC_LIKE     0x0004 /* Candidate for the LIKE optimization */
#define SQLITE_FUNC_CASE     0x0008 /* Case-sensitive LIKE-type function */
#define SQLITE_FUNC_EPHEM    0x0010 /* Ephemeral.  Delete with VDBE */
#define SQLITE_FUNC_NEEDCOLL 0x0020 /* sqlite3GetFuncCollSeq() might be called*/
#define SQLITE_FUNC_LENGTH   0x0040 /* Built-in length() function */
................................................................................
#define JT_OUTER     0x0020    /* The "OUTER" keyword is present */
#define JT_ERROR     0x0040    /* unknown or unsupported join type */


/*
** Flags appropriate for the wctrlFlags parameter of sqlite3WhereBegin()
** and the WhereInfo.wctrlFlags member.



*/
#define WHERE_ORDERBY_NORMAL   0x0000 /* No-op */
#define WHERE_ORDERBY_MIN      0x0001 /* ORDER BY processing for min() func */
#define WHERE_ORDERBY_MAX      0x0002 /* ORDER BY processing for max() func */
#define WHERE_ONEPASS_DESIRED  0x0004 /* Want to do one-pass UPDATE/DELETE */
#define WHERE_DUPLICATES_OK    0x0008 /* Ok to return a row more than once */
#define WHERE_OMIT_OPEN_CLOSE  0x0010 /* Table cursors are already open */
................................................................................
  int nErr;            /* Number of errors encountered while resolving names */
  u16 ncFlags;         /* Zero or more NC_* flags defined below */
};

/*
** Allowed values for the NameContext, ncFlags field.
**
** Note:  NC_MinMaxAgg must have the same value as SF_MinMaxAgg and

** SQLITE_FUNC_MINMAX.
**
*/
#define NC_AllowAgg  0x0001  /* Aggregate functions are allowed here */
#define NC_HasAgg    0x0002  /* One or more aggregate functions seen */
#define NC_IsCheck   0x0004  /* True if resolving names in a CHECK constraint */
#define NC_InAggFunc 0x0008  /* True if analyzing arguments to an agg func */
#define NC_PartIdx   0x0010  /* True if resolving a partial index WHERE */
#define NC_IdxExpr   0x0020  /* True if resolving columns of CREATE INDEX */
#define NC_MinMaxAgg 0x1000  /* min/max aggregates seen.  See note above */

/*
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
**
................................................................................
  Expr *pOffset;         /* OFFSET expression. NULL means not used. */
  With *pWith;           /* WITH clause attached to this select. Or NULL. */
};

/*
** Allowed values for Select.selFlags.  The "SF" prefix stands for
** "Select Flag".





*/
#define SF_Distinct       0x00001  /* Output should be DISTINCT */
#define SF_All            0x00002  /* Includes the ALL keyword */
#define SF_Resolved       0x00004  /* Identifiers have been resolved */
#define SF_Aggregate      0x00008  /* Contains aggregate functions */

#define SF_UsesEphemeral  0x00010  /* Uses the OpenEphemeral opcode */
#define SF_Expanded       0x00020  /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo    0x00040  /* FROM subqueries have Table metadata */
#define SF_Compound       0x00080  /* Part of a compound query */
#define SF_Values         0x00100  /* Synthesized from VALUES clause */
#define SF_MultiValue     0x00200  /* Single VALUES term with multiple rows */
#define SF_NestedFrom     0x00400  /* Part of a parenthesized FROM clause */
#define SF_MaybeConvert   0x00800  /* Need convertCompoundSelectToSubquery() */
#define SF_MinMaxAgg      0x01000  /* Aggregate containing min() or max() */
#define SF_Recursive      0x02000  /* The recursive part of a recursive CTE */
#define SF_FixedLimit     0x04000  /* nSelectRow set by a constant LIMIT */

#define SF_Converted      0x08000  /* By convertCompoundSelectToSubquery() */
#define SF_IncludeHidden  0x10000  /* Include hidden columns in output */


/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
................................................................................
  u8 nested;           /* Number of nested calls to the parser/code generator */
  u8 nTempReg;         /* Number of temporary registers in aTempReg[] */
  u8 isMultiWrite;     /* True if statement may modify/insert multiple rows */
  u8 mayAbort;         /* True if statement may throw an ABORT exception */
  u8 hasCompound;      /* Need to invoke convertCompoundSelectToSubquery() */
  u8 okConstFactor;    /* OK to factor out constants */
  u8 disableLookaside; /* Number of times lookaside has been disabled */

  int aTempReg[8];     /* Holding area for temporary registers */
  int nRangeReg;       /* Size of the temporary register block */
  int iRangeReg;       /* First register in temporary register block */
  int nErr;            /* Number of errors seen */
  int nTab;            /* Number of previously allocated VDBE cursors */
  int nMem;            /* Number of memory cells used so far */
  int nSet;            /* Number of sets used so far */
................................................................................
struct AuthContext {
  const char *zAuthContext;   /* Put saved Parse.zAuthContext here */
  Parse *pParse;              /* The Parse structure */
};

/*
** Bitfield flags for P5 value in various opcodes.









*/
#define OPFLAG_NCHANGE       0x01    /* OP_Insert: Set to update db->nChange */
                                     /* Also used in P2 (not P5) of OP_Delete */
#define OPFLAG_EPHEM         0x01    /* OP_Column: Ephemeral output is ok */
#define OPFLAG_LASTROWID     0x02    /* Set to update db->lastRowid */
#define OPFLAG_ISUPDATE      0x04    /* This OP_Insert is an sql UPDATE */
#define OPFLAG_APPEND        0x08    /* This is likely to be an append */
................................................................................
# define sqlite3Toupper(x)  ((x)&~(sqlite3CtypeMap[(unsigned char)(x)]&0x20))
# define sqlite3Isspace(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x01)
# define sqlite3Isalnum(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x06)
# define sqlite3Isalpha(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x02)
# define sqlite3Isdigit(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x04)
# define sqlite3Isxdigit(x)  (sqlite3CtypeMap[(unsigned char)(x)]&0x08)
# define sqlite3Tolower(x)   (sqlite3UpperToLower[(unsigned char)(x)])

#else
# define sqlite3Toupper(x)   toupper((unsigned char)(x))
# define sqlite3Isspace(x)   isspace((unsigned char)(x))
# define sqlite3Isalnum(x)   isalnum((unsigned char)(x))
# define sqlite3Isalpha(x)   isalpha((unsigned char)(x))
# define sqlite3Isdigit(x)   isdigit((unsigned char)(x))
# define sqlite3Isxdigit(x)  isxdigit((unsigned char)(x))
# define sqlite3Tolower(x)   tolower((unsigned char)(x))

#endif
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
SQLITE_PRIVATE int sqlite3IsIdChar(u8);
#endif

/*
** Internal function prototypes
................................................................................
SQLITE_PRIVATE   void sqlite3TreeViewSelect(TreeView*, const Select*, u8);
SQLITE_PRIVATE   void sqlite3TreeViewWith(TreeView*, const With*, u8);
#endif


SQLITE_PRIVATE void sqlite3SetString(char **, sqlite3*, const char*);
SQLITE_PRIVATE void sqlite3ErrorMsg(Parse*, const char*, ...);
SQLITE_PRIVATE int sqlite3Dequote(char*);
SQLITE_PRIVATE void sqlite3TokenInit(Token*,char*);
SQLITE_PRIVATE int sqlite3KeywordCode(const unsigned char*, int);
SQLITE_PRIVATE int sqlite3RunParser(Parse*, const char*, char **);
SQLITE_PRIVATE void sqlite3FinishCoding(Parse*);
SQLITE_PRIVATE int sqlite3GetTempReg(Parse*);
SQLITE_PRIVATE void sqlite3ReleaseTempReg(Parse*,int);
SQLITE_PRIVATE int sqlite3GetTempRange(Parse*,int);
................................................................................
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3NoTempsInRange(Parse*,int,int);
#endif
SQLITE_PRIVATE Expr *sqlite3ExprAlloc(sqlite3*,int,const Token*,int);
SQLITE_PRIVATE Expr *sqlite3Expr(sqlite3*,int,const char*);
SQLITE_PRIVATE void sqlite3ExprAttachSubtrees(sqlite3*,Expr*,Expr*,Expr*);
SQLITE_PRIVATE Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*, const Token*);

SQLITE_PRIVATE Expr *sqlite3ExprAnd(sqlite3*,Expr*, Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*);
SQLITE_PRIVATE void sqlite3ExprAssignVarNumber(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3*, Expr*);
SQLITE_PRIVATE ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*);
SQLITE_PRIVATE void sqlite3ExprListSetSortOrder(ExprList*,int);
SQLITE_PRIVATE void sqlite3ExprListSetName(Parse*,ExprList*,Token*,int);
................................................................................
**   isspace()                        0x01
**   isalpha()                        0x02
**   isdigit()                        0x04
**   isalnum()                        0x06
**   isxdigit()                       0x08
**   toupper()                        0x20
**   SQLite identifier character      0x40

**
** Bit 0x20 is set if the mapped character requires translation to upper
** case. i.e. if the character is a lower-case ASCII character.
** If x is a lower-case ASCII character, then its upper-case equivalent
** is (x - 0x20). Therefore toupper() can be implemented as:
**
**   (x & ~(map[x]&0x20))
................................................................................
*/
#ifdef SQLITE_ASCII
SQLITE_PRIVATE const unsigned char sqlite3CtypeMap[256] = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 00..07    ........ */
  0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,  /* 08..0f    ........ */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 10..17    ........ */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 18..1f    ........ */
  0x01, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,  /* 20..27     !"#$%&' */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 28..2f    ()*+,-./ */
  0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,  /* 30..37    01234567 */
  0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 38..3f    89:;<=>? */

  0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x02,  /* 40..47    @ABCDEFG */
  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 48..4f    HIJKLMNO */
  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 50..57    PQRSTUVW */
  0x02, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x40,  /* 58..5f    XYZ[\]^_ */
  0x00, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x22,  /* 60..67    `abcdefg */
  0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 68..6f    hijklmno */
  0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 70..77    pqrstuvw */
  0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 78..7f    xyz{|}~. */

  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 80..87    ........ */
  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 88..8f    ........ */
  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 90..97    ........ */
................................................................................
/* #include "sqliteInt.h" */
/* #include <stdlib.h> */
/* #include <assert.h> */
#include <time.h>

#ifndef SQLITE_OMIT_DATETIME_FUNCS











/*
** A structure for holding a single date and time.
*/
typedef struct DateTime DateTime;
struct DateTime {
  sqlite3_int64 iJD; /* The julian day number times 86400000 */
................................................................................
*/
static void clearYMD_HMS_TZ(DateTime *p){
  p->validYMD = 0;
  p->validHMS = 0;
  p->validTZ = 0;
}


/*
** On recent Windows platforms, the localtime_s() function is available
** as part of the "Secure CRT". It is essentially equivalent to 
** localtime_r() available under most POSIX platforms, except that the 
** order of the parameters is reversed.
**
** See http://msdn.microsoft.com/en-us/library/a442x3ye(VS.80).aspx.
................................................................................
*/
#if !HAVE_LOCALTIME_R && !HAVE_LOCALTIME_S \
    && defined(_MSC_VER) && defined(_CRT_INSECURE_DEPRECATE)
#undef  HAVE_LOCALTIME_S
#define HAVE_LOCALTIME_S 1
#endif

#ifndef SQLITE_OMIT_LOCALTIME
/*
** The following routine implements the rough equivalent of localtime_r()
** using whatever operating-system specific localtime facility that
** is available.  This routine returns 0 on success and
** non-zero on any kind of error.
**
** If the sqlite3GlobalConfig.bLocaltimeFault variable is true then this
................................................................................

/*
** The following routines are convenience wrappers around methods
** of the sqlite3_file object.  This is mostly just syntactic sugar. All
** of this would be completely automatic if SQLite were coded using
** C++ instead of plain old C.
*/
SQLITE_PRIVATE int sqlite3OsClose(sqlite3_file *pId){
  int rc = SQLITE_OK;
  if( pId->pMethods ){
    rc = pId->pMethods->xClose(pId);
    pId->pMethods = 0;
  }
  return rc;
}
SQLITE_PRIVATE int sqlite3OsRead(sqlite3_file *id, void *pBuf, int amt, i64 offset){
  DO_OS_MALLOC_TEST(id);
  return id->pMethods->xRead(id, pBuf, amt, offset);
}
SQLITE_PRIVATE int sqlite3OsWrite(sqlite3_file *id, const void *pBuf, int amt, i64 offset){
  DO_OS_MALLOC_TEST(id);
................................................................................
      *ppFile = pFile;
    }
  }else{
    rc = SQLITE_NOMEM_BKPT;
  }
  return rc;
}
SQLITE_PRIVATE int sqlite3OsCloseFree(sqlite3_file *pFile){
  int rc = SQLITE_OK;
  assert( pFile );
  rc = sqlite3OsClose(pFile);
  sqlite3_free(pFile);
  return rc;
}

/*
** This function is a wrapper around the OS specific implementation of
** sqlite3_os_init(). The purpose of the wrapper is to provide the
** ability to simulate a malloc failure, so that the handling of an
** error in sqlite3_os_init() by the upper layers can be tested.
................................................................................
** dequoted string, exclusive of the zero terminator, if dequoting does
** occur.
**
** 2002-Feb-14: This routine is extended to remove MS-Access style
** brackets from around identifiers.  For example:  "[a-b-c]" becomes
** "a-b-c".
*/
SQLITE_PRIVATE int sqlite3Dequote(char *z){
  char quote;
  int i, j;
  if( z==0 ) return -1;
  quote = z[0];
  switch( quote ){
    case '\'':  break;
    case '"':   break;
    case '`':   break;                /* For MySQL compatibility */
    case '[':   quote = ']';  break;  /* For MS SqlServer compatibility */
    default:    return -1;
  }
  for(i=1, j=0;; i++){
    assert( z[i] );
    if( z[i]==quote ){
      if( z[i+1]==quote ){
        z[j++] = quote;
        i++;
      }else{
................................................................................
        break;
      }
    }else{
      z[j++] = z[i];
    }
  }
  z[j] = 0;
  return j;
}

/*
** Generate a Token object from a string
*/
SQLITE_PRIVATE void sqlite3TokenInit(Token *p, char *z){
  p->z = z;
................................................................................
  i64 s = 0;       /* significand */
  int d = 0;       /* adjust exponent for shifting decimal point */
  int esign = 1;   /* sign of exponent */
  int e = 0;       /* exponent */
  int eValid = 1;  /* True exponent is either not used or is well-formed */
  double result;
  int nDigits = 0;
  int nonNum = 0;

  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
  *pResult = 0.0;   /* Default return value, in case of an error */

  if( enc==SQLITE_UTF8 ){
    incr = 1;
  }else{
    int i;
    incr = 2;
    assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
    for(i=3-enc; i<length && z[i]==0; i+=2){}
    nonNum = i<length;
    zEnd = z+i+enc-3;
    z += (enc&1);
  }

  /* skip leading spaces */
  while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
  if( z>=zEnd ) return 0;

................................................................................
  if( *z=='-' ){
    sign = -1;
    z+=incr;
  }else if( *z=='+' ){
    z+=incr;
  }

  /* skip leading zeroes */
  while( z<zEnd && z[0]=='0' ) z+=incr, nDigits++;

  /* copy max significant digits to significand */
  while( z<zEnd && sqlite3Isdigit(*z) && s<((LARGEST_INT64-9)/10) ){
    s = s*10 + (*z - '0');
    z+=incr, nDigits++;
  }

  /* skip non-significant significand digits
................................................................................
  if( z>=zEnd ) goto do_atof_calc;

  /* if decimal point is present */
  if( *z=='.' ){
    z+=incr;
    /* copy digits from after decimal to significand
    ** (decrease exponent by d to shift decimal right) */
    while( z<zEnd && sqlite3Isdigit(*z) && s<((LARGEST_INT64-9)/10) ){

      s = s*10 + (*z - '0');


      z+=incr, nDigits++, d--;
    }
    /* skip non-significant digits */
    while( z<zEnd && sqlite3Isdigit(*z) ) z+=incr, nDigits++;
  }
  if( z>=zEnd ) goto do_atof_calc;

  /* if exponent is present */
  if( *z=='e' || *z=='E' ){
    z+=incr;
    eValid = 0;




    if( z>=zEnd ) goto do_atof_calc;

    /* get sign of exponent */
    if( *z=='-' ){
      esign = -1;
      z+=incr;
    }else if( *z=='+' ){
      z+=incr;
    }
................................................................................
      e = e<10000 ? (e*10 + (*z - '0')) : 10000;
      z+=incr;
      eValid = 1;
    }
  }

  /* skip trailing spaces */
  if( nDigits && eValid ){
    while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
  }

do_atof_calc:
  /* adjust exponent by d, and update sign */
  e = (e*esign) + d;
  if( e<0 ) {
    esign = -1;
    e *= -1;
  } else {
    esign = 1;
  }

  /* if 0 significand */
  if( !s ) {
    /* In the IEEE 754 standard, zero is signed.
    ** Add the sign if we've seen at least one digit */
    result = (sign<0 && nDigits) ? -(double)0 : (double)0;
  } else {
    /* attempt to reduce exponent */






    if( esign>0 ){
      while( s<(LARGEST_INT64/10) && e>0 ) e--,s*=10;


    }else{
      while( !(s%10) && e>0 ) e--,s/=10;




    }

    /* adjust the sign of significand */
    s = sign<0 ? -s : s;

    /* if exponent, scale significand as appropriate
    ** and store in result. */
    if( e ){
      LONGDOUBLE_TYPE scale = 1.0;
      /* attempt to handle extremely small/large numbers better */
      if( e>307 && e<342 ){

        while( e%308 ) { scale *= 1.0e+1; e -= 1; }
        if( esign<0 ){
          result = s / scale;
          result /= 1.0e+308;
        }else{
          result = s * scale;
          result *= 1.0e+308;
        }
      }else if( e>=342 ){
        if( esign<0 ){
          result = 0.0*s;
        }else{
          result = 1e308*1e308*s;  /* Infinity */

        }
      }else{
        /* 1.0e+22 is the largest power of 10 than can be 
        ** represented exactly. */
        while( e%22 ) { scale *= 1.0e+1; e -= 1; }
        while( e>0 ) { scale *= 1.0e+22; e -= 22; }
        if( esign<0 ){
          result = s / scale;
        }else{
          result = s * scale;
        }
      }
    } else {
      result = (double)s;
    }
  }

  /* store the result */
  *pResult = result;

  /* return true if number and no extra non-whitespace chracters after */
  return z>=zEnd && nDigits>0 && eValid && nonNum==0;
#else
  return !sqlite3Atoi64(z, pResult, length, enc);
#endif /* SQLITE_OMIT_FLOATING_POINT */
}

/*
** Compare the 19-character string zNum against the text representation
................................................................................
*/
SQLITE_PRIVATE int sqlite3Atoi64(const char *zNum, i64 *pNum, int length, u8 enc){
  int incr;
  u64 u = 0;
  int neg = 0; /* assume positive */
  int i;
  int c = 0;
  int nonNum = 0;
  const char *zStart;
  const char *zEnd = zNum + length;
  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
  if( enc==SQLITE_UTF8 ){
    incr = 1;
  }else{
    incr = 2;
    assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
    for(i=3-enc; i<length && zNum[i]==0; i+=2){}
    nonNum = i<length;
    zEnd = zNum+i+enc-3;
    zNum += (enc&1);
  }
  while( zNum<zEnd && sqlite3Isspace(*zNum) ) zNum+=incr;
  if( zNum<zEnd ){
    if( *zNum=='-' ){
      neg = 1;
      zNum+=incr;
................................................................................
    *pNum = -(i64)u;
  }else{
    *pNum = (i64)u;
  }
  testcase( i==18 );
  testcase( i==19 );
  testcase( i==20 );

  if( (c!=0 && &zNum[i]<zEnd) || (i==0 && zStart==zNum)
       || i>19*incr || nonNum ){



    /* zNum is empty or contains non-numeric text or is longer
    ** than 19 digits (thus guaranteeing that it is too large) */
    return 1;
  }else if( i<19*incr ){
    /* Less than 19 digits, so we know that it fits in 64 bits */
    assert( u<=LARGEST_INT64 );
    return 0;
................................................................................
**     1    Integer too large for a 64-bit signed integer or is malformed
**     2    Special case of 9223372036854775808
*/
SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char *z, i64 *pOut){
#ifndef SQLITE_OMIT_HEX_INTEGER
  if( z[0]=='0'
   && (z[1]=='x' || z[1]=='X')
   && sqlite3Isxdigit(z[2])
  ){
    u64 u = 0;
    int i, k;
    for(i=2; z[i]=='0'; i++){}
    for(k=i; sqlite3Isxdigit(z[k]); k++){
      u = u*16 + sqlite3HexToInt(z[k]);
    }
................................................................................
SQLITE_PRIVATE LogEst sqlite3LogEst(u64 x){
  static LogEst a[] = { 0, 2, 3, 5, 6, 7, 8, 9 };
  LogEst y = 40;
  if( x<8 ){
    if( x<2 ) return 0;
    while( x<8 ){  y -= 10; x <<= 1; }
  }else{
    while( x>255 ){ y += 40; x >>= 4; }
    while( x>15 ){  y += 10; x >>= 1; }
  }
  return a[x&7] + y - 10;
}

#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
................................................................................

/*
** The hashing function.
*/
static unsigned int strHash(const char *z){
  unsigned int h = 0;
  unsigned char c;
  while( (c = (unsigned char)*z++)!=0 ){
    h = (h<<3) ^ h ^ sqlite3UpperToLower[c];
  }
  return h;
}


/* Link pNew element into the hash table pH.  If pEntry!=0 then also
................................................................................
  const char *pKey,   /* The key we are searching for */
  unsigned int *pHash /* Write the hash value here */
){
  HashElem *elem;                /* Used to loop thru the element list */
  int count;                     /* Number of elements left to test */
  unsigned int h;                /* The computed hash */

  if( pH->ht ){
    struct _ht *pEntry;
    h = strHash(pKey) % pH->htsize;
    pEntry = &pH->ht[h];
    elem = pEntry->chain;
    count = pEntry->count;
  }else{
    h = 0;
................................................................................
    /*   8 */ "Checkpoint"       OpHelp(""),
    /*   9 */ "JournalMode"      OpHelp(""),
    /*  10 */ "Vacuum"           OpHelp(""),
    /*  11 */ "VFilter"          OpHelp("iplan=r[P3] zplan='P4'"),
    /*  12 */ "VUpdate"          OpHelp("data=r[P3@P2]"),
    /*  13 */ "Goto"             OpHelp(""),
    /*  14 */ "Gosub"            OpHelp(""),
    /*  15 */ "Return"           OpHelp(""),
    /*  16 */ "InitCoroutine"    OpHelp(""),
    /*  17 */ "EndCoroutine"     OpHelp(""),
    /*  18 */ "Yield"            OpHelp(""),
    /*  19 */ "Not"              OpHelp("r[P2]= !r[P1]"),
    /*  20 */ "HaltIfNull"       OpHelp("if r[P3]=null halt"),
    /*  21 */ "Halt"             OpHelp(""),
    /*  22 */ "Integer"          OpHelp("r[P2]=P1"),
    /*  23 */ "Int64"            OpHelp("r[P2]=P4"),
    /*  24 */ "String"           OpHelp("r[P2]='P4' (len=P1)"),
    /*  25 */ "Null"             OpHelp("r[P2..P3]=NULL"),
    /*  26 */ "SoftNull"         OpHelp("r[P1]=NULL"),
    /*  27 */ "Blob"             OpHelp("r[P2]=P4 (len=P1)"),
    /*  28 */ "Variable"         OpHelp("r[P2]=parameter(P1,P4)"),
    /*  29 */ "Move"             OpHelp("r[P2@P3]=r[P1@P3]"),
    /*  30 */ "Copy"             OpHelp("r[P2@P3+1]=r[P1@P3+1]"),
    /*  31 */ "SCopy"            OpHelp("r[P2]=r[P1]"),
    /*  32 */ "IntCopy"          OpHelp("r[P2]=r[P1]"),
    /*  33 */ "ResultRow"        OpHelp("output=r[P1@P2]"),
    /*  34 */ "CollSeq"          OpHelp(""),
    /*  35 */ "Function0"        OpHelp("r[P3]=func(r[P2@P5])"),
    /*  36 */ "Function"         OpHelp("r[P3]=func(r[P2@P5])"),
    /*  37 */ "AddImm"           OpHelp("r[P1]=r[P1]+P2"),
    /*  38 */ "MustBeInt"        OpHelp(""),
    /*  39 */ "RealAffinity"     OpHelp(""),
    /*  40 */ "Cast"             OpHelp("affinity(r[P1])"),
    /*  41 */ "Permutation"      OpHelp(""),
    /*  42 */ "Compare"          OpHelp("r[P1@P3] <-> r[P2@P3]"),
    /*  43 */ "Jump"             OpHelp(""),
    /*  44 */ "Once"             OpHelp(""),
    /*  45 */ "If"               OpHelp(""),
    /*  46 */ "IfNot"            OpHelp(""),
    /*  47 */ "Column"           OpHelp("r[P3]=PX"),
    /*  48 */ "Affinity"         OpHelp("affinity(r[P1@P2])"),
    /*  49 */ "MakeRecord"       OpHelp("r[P3]=mkrec(r[P1@P2])"),
    /*  50 */ "Count"            OpHelp("r[P2]=count()"),
    /*  51 */ "ReadCookie"       OpHelp(""),
    /*  52 */ "SetCookie"        OpHelp(""),
    /*  53 */ "ReopenIdx"        OpHelp("root=P2 iDb=P3"),
    /*  54 */ "OpenRead"         OpHelp("root=P2 iDb=P3"),
    /*  55 */ "OpenWrite"        OpHelp("root=P2 iDb=P3"),
    /*  56 */ "OpenAutoindex"    OpHelp("nColumn=P2"),
    /*  57 */ "OpenEphemeral"    OpHelp("nColumn=P2"),
    /*  58 */ "SorterOpen"       OpHelp(""),
    /*  59 */ "SequenceTest"     OpHelp("if( cursor[P1].ctr++ ) pc = P2"),
    /*  60 */ "OpenPseudo"       OpHelp("P3 columns in r[P2]"),
    /*  61 */ "Close"            OpHelp(""),
    /*  62 */ "ColumnsUsed"      OpHelp(""),
    /*  63 */ "SeekLT"           OpHelp("key=r[P3@P4]"),
    /*  64 */ "SeekLE"           OpHelp("key=r[P3@P4]"),
    /*  65 */ "SeekGE"           OpHelp("key=r[P3@P4]"),
    /*  66 */ "SeekGT"           OpHelp("key=r[P3@P4]"),
    /*  67 */ "NoConflict"       OpHelp("key=r[P3@P4]"),
    /*  68 */ "NotFound"         OpHelp("key=r[P3@P4]"),
    /*  69 */ "Found"            OpHelp("key=r[P3@P4]"),
    /*  70 */ "NotExists"        OpHelp("intkey=r[P3]"),
    /*  71 */ "Or"               OpHelp("r[P3]=(r[P1] || r[P2])"),
    /*  72 */ "And"              OpHelp("r[P3]=(r[P1] && r[P2])"),
    /*  73 */ "Sequence"         OpHelp("r[P2]=cursor[P1].ctr++"),
    /*  74 */ "NewRowid"         OpHelp("r[P2]=rowid"),
    /*  75 */ "Insert"           OpHelp("intkey=r[P3] data=r[P2]"),
    /*  76 */ "IsNull"           OpHelp("if r[P1]==NULL goto P2"),
    /*  77 */ "NotNull"          OpHelp("if r[P1]!=NULL goto P2"),
    /*  78 */ "Ne"               OpHelp("if r[P1]!=r[P3] goto P2"),
    /*  79 */ "Eq"               OpHelp("if r[P1]==r[P3] goto P2"),
    /*  80 */ "Gt"               OpHelp("if r[P1]>r[P3] goto P2"),
    /*  81 */ "Le"               OpHelp("if r[P1]<=r[P3] goto P2"),
    /*  82 */ "Lt"               OpHelp("if r[P1]<r[P3] goto P2"),
    /*  83 */ "Ge"               OpHelp("if r[P1]>=r[P3] goto P2"),
    /*  84 */ "InsertInt"        OpHelp("intkey=P3 data=r[P2]"),
    /*  85 */ "BitAnd"           OpHelp("r[P3]=r[P1]&r[P2]"),
    /*  86 */ "BitOr"            OpHelp("r[P3]=r[P1]|r[P2]"),
    /*  87 */ "ShiftLeft"        OpHelp("r[P3]=r[P2]<<r[P1]"),
    /*  88 */ "ShiftRight"       OpHelp("r[P3]=r[P2]>>r[P1]"),
    /*  89 */ "Add"              OpHelp("r[P3]=r[P1]+r[P2]"),
    /*  90 */ "Subtract"         OpHelp("r[P3]=r[P2]-r[P1]"),
    /*  91 */ "Multiply"         OpHelp("r[P3]=r[P1]*r[P2]"),
    /*  92 */ "Divide"           OpHelp("r[P3]=r[P2]/r[P1]"),
    /*  93 */ "Remainder"        OpHelp("r[P3]=r[P2]%r[P1]"),
    /*  94 */ "Concat"           OpHelp("r[P3]=r[P2]+r[P1]"),
    /*  95 */ "Delete"           OpHelp(""),
    /*  96 */ "BitNot"           OpHelp("r[P1]= ~r[P1]"),
    /*  97 */ "String8"          OpHelp("r[P2]='P4'"),
    /*  98 */ "ResetCount"       OpHelp(""),
    /*  99 */ "SorterCompare"    OpHelp("if key(P1)!=trim(r[P3],P4) goto P2"),
    /* 100 */ "SorterData"       OpHelp("r[P2]=data"),
    /* 101 */ "RowKey"           OpHelp("r[P2]=key"),
    /* 102 */ "RowData"          OpHelp("r[P2]=data"),
    /* 103 */ "Rowid"            OpHelp("r[P2]=rowid"),
    /* 104 */ "NullRow"          OpHelp(""),
    /* 105 */ "Last"             OpHelp(""),
    /* 106 */ "SorterSort"       OpHelp(""),
    /* 107 */ "Sort"             OpHelp(""),
    /* 108 */ "Rewind"           OpHelp(""),
    /* 109 */ "SorterInsert"     OpHelp(""),
    /* 110 */ "IdxInsert"        OpHelp("key=r[P2]"),
    /* 111 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
    /* 112 */ "Seek"             OpHelp("Move P3 to P1.rowid"),
    /* 113 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
    /* 114 */ "IdxLE"            OpHelp("key=r[P3@P4]"),
    /* 115 */ "IdxGT"            OpHelp("key=r[P3@P4]"),
    /* 116 */ "IdxLT"            OpHelp("key=r[P3@P4]"),
    /* 117 */ "IdxGE"            OpHelp("key=r[P3@P4]"),
    /* 118 */ "Destroy"          OpHelp(""),
    /* 119 */ "Clear"            OpHelp(""),
    /* 120 */ "ResetSorter"      OpHelp(""),
    /* 121 */ "CreateIndex"      OpHelp("r[P2]=root iDb=P1"),
    /* 122 */ "CreateTable"      OpHelp("r[P2]=root iDb=P1"),
    /* 123 */ "ParseSchema"      OpHelp(""),
    /* 124 */ "LoadAnalysis"     OpHelp(""),
    /* 125 */ "DropTable"        OpHelp(""),
    /* 126 */ "DropIndex"        OpHelp(""),
    /* 127 */ "DropTrigger"      OpHelp(""),
    /* 128 */ "IntegrityCk"      OpHelp(""),
    /* 129 */ "RowSetAdd"        OpHelp("rowset(P1)=r[P2]"),
    /* 130 */ "RowSetRead"       OpHelp("r[P3]=rowset(P1)"),
    /* 131 */ "RowSetTest"       OpHelp("if r[P3] in rowset(P1) goto P2"),
    /* 132 */ "Program"          OpHelp(""),
    /* 133 */ "Real"             OpHelp("r[P2]=P4"),
    /* 134 */ "Param"            OpHelp(""),
    /* 135 */ "FkCounter"        OpHelp("fkctr[P1]+=P2"),
    /* 136 */ "FkIfZero"         OpHelp("if fkctr[P1]==0 goto P2"),
    /* 137 */ "MemMax"           OpHelp("r[P1]=max(r[P1],r[P2])"),
    /* 138 */ "IfPos"            OpHelp("if r[P1]>0 then r[P1]-=P3, goto P2"),
    /* 139 */ "OffsetLimit"      OpHelp("if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1)"),
    /* 140 */ "IfNotZero"        OpHelp("if r[P1]!=0 then r[P1]-=P3, goto P2"),
    /* 141 */ "DecrJumpZero"     OpHelp("if (--r[P1])==0 goto P2"),
    /* 142 */ "JumpZeroIncr"     OpHelp("if (r[P1]++)==0 ) goto P2"),
    /* 143 */ "AggStep0"         OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 144 */ "AggStep"          OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 145 */ "AggFinal"         OpHelp("accum=r[P1] N=P2"),
    /* 146 */ "IncrVacuum"       OpHelp(""),
    /* 147 */ "Expire"           OpHelp(""),
    /* 148 */ "TableLock"        OpHelp("iDb=P1 root=P2 write=P3"),
    /* 149 */ "VBegin"           OpHelp(""),
    /* 150 */ "VCreate"          OpHelp(""),
    /* 151 */ "VDestroy"         OpHelp(""),
    /* 152 */ "VOpen"            OpHelp(""),
    /* 153 */ "VColumn"          OpHelp("r[P3]=vcolumn(P2)"),
    /* 154 */ "VNext"            OpHelp(""),
    /* 155 */ "VRename"          OpHelp(""),
    /* 156 */ "Pagecount"        OpHelp(""),
    /* 157 */ "MaxPgcnt"         OpHelp(""),
    /* 158 */ "Init"             OpHelp("Start at P2"),
    /* 159 */ "CursorHint"       OpHelp(""),
    /* 160 */ "Noop"             OpHelp(""),
    /* 161 */ "Explain"          OpHelp(""),
  };
  return azName[i];
}
#endif

/************** End of opcodes.c *********************************************/
/************** Begin file os_unix.c *****************************************/
................................................................................
#define osPread     ((ssize_t(*)(int,void*,size_t,off_t))aSyscall[9].pCurrent)

#if defined(USE_PREAD64)
  { "pread64",      (sqlite3_syscall_ptr)pread64,    0  },
#else
  { "pread64",      (sqlite3_syscall_ptr)0,          0  },
#endif
#define osPread64   ((ssize_t(*)(int,void*,size_t,off_t))aSyscall[10].pCurrent)

  { "write",        (sqlite3_syscall_ptr)write,      0  },
#define osWrite     ((ssize_t(*)(int,const void*,size_t))aSyscall[11].pCurrent)

#if defined(USE_PREAD) || SQLITE_ENABLE_LOCKING_STYLE
  { "pwrite",       (sqlite3_syscall_ptr)pwrite,     0  },
#else
................................................................................
                    aSyscall[12].pCurrent)

#if defined(USE_PREAD64)
  { "pwrite64",     (sqlite3_syscall_ptr)pwrite64,   0  },
#else
  { "pwrite64",     (sqlite3_syscall_ptr)0,          0  },
#endif
#define osPwrite64  ((ssize_t(*)(int,const void*,size_t,off_t))\
                    aSyscall[13].pCurrent)

  { "fchmod",       (sqlite3_syscall_ptr)fchmod,          0  },
#define osFchmod    ((int(*)(int,mode_t))aSyscall[14].pCurrent)

#if defined(HAVE_POSIX_FALLOCATE) && HAVE_POSIX_FALLOCATE
  { "fallocate",    (sqlite3_syscall_ptr)posix_fallocate,  0 },
................................................................................
#else
    sqlite3_snprintf(nShmFilename, zShmFilename, "%s-shm", zBasePath);
    sqlite3FileSuffix3(pDbFd->zPath, zShmFilename);
#endif
    pShmNode->h = -1;
    pDbFd->pInode->pShmNode = pShmNode;
    pShmNode->pInode = pDbFd->pInode;

    pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
    if( pShmNode->mutex==0 ){
      rc = SQLITE_NOMEM_BKPT;
      goto shm_open_err;

    }

    if( pInode->bProcessLock==0 ){
      int openFlags = O_RDWR | O_CREAT;
      if( sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
        openFlags = O_RDONLY;
        pShmNode->isReadonly = 1;
................................................................................
     0,
     0,
     "/var/tmp",
     "/usr/tmp",
     "/tmp",
     "."
  };
  unsigned int i;
  struct stat buf;
  const char *zDir = sqlite3_temp_directory;

  if( !azDirs[0] ) azDirs[0] = getenv("SQLITE_TMPDIR");
  if( !azDirs[1] ) azDirs[1] = getenv("TMPDIR");
  for(i=0; i<sizeof(azDirs)/sizeof(azDirs[0]); zDir=azDirs[i++]){
    if( zDir==0 ) continue;
    if( osStat(zDir, &buf) ) continue;
    if( !S_ISDIR(buf.st_mode) ) continue;
    if( osAccess(zDir, 07) ) continue;
    break;


  }



  return zDir;
}

/*
** Create a temporary file name in zBuf.  zBuf must be allocated
** by the calling process and must be big enough to hold at least
** pVfs->mxPathname bytes.
*/
................................................................................
  const char *zDir;
  int iLimit = 0;

  /* It's odd to simulate an io-error here, but really this is just
  ** using the io-error infrastructure to test that SQLite handles this
  ** function failing. 
  */

  SimulateIOError( return SQLITE_IOERR );

  zDir = unixTempFileDir();

  do{
    u64 r;
    sqlite3_randomness(sizeof(r), &r);
    assert( nBuf>2 );
    zBuf[nBuf-2] = 0;
    sqlite3_snprintf(nBuf, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX"%llx%c",
                     zDir, r, 0);
................................................................................
** the sqlite3_memory_used() function does not return zero, SQLITE_BUSY will
** be returned and no changes will be made to the Win32 native heap.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_win32_reset_heap(){
  int rc;
  MUTEX_LOGIC( sqlite3_mutex *pMaster; ) /* The main static mutex */
  MUTEX_LOGIC( sqlite3_mutex *pMem; )    /* The memsys static mutex */
  MUTEX_LOGIC( pMaster = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER); )
  MUTEX_LOGIC( pMem = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MEM); )
  sqlite3_mutex_enter(pMaster);
  sqlite3_mutex_enter(pMem);
  winMemAssertMagic();
  if( winMemGetHeap()!=NULL && winMemGetOwned() && sqlite3_memory_used()==0 ){
    /*
    ** At this point, there should be no outstanding memory allocations on
    ** the heap.  Also, since both the master and memsys locks are currently
................................................................................
    sqlite3_log(SQLITE_NOTICE,
      "delayed %dms for lock/sharing conflict at line %d",
      winIoerrRetryDelay*nRetry*(nRetry+1)/2, lineno
    );
  }
}

#if SQLITE_OS_WINCE

/*************************************************************************
** This section contains code for WinCE only.
*/

#if !defined(SQLITE_MSVC_LOCALTIME_API) || !SQLITE_MSVC_LOCALTIME_API
/*
** The MSVC CRT on Windows CE may not have a localtime() function.  So
** create a substitute.
*/
/* #include <time.h> */
struct tm *__cdecl localtime(const time_t *t)
{
  static struct tm y;
  FILETIME uTm, lTm;
  SYSTEMTIME pTm;
  sqlite3_int64 t64;
  t64 = *t;
................................................................................
  y.tm_hour = pTm.wHour;
  y.tm_min = pTm.wMinute;
  y.tm_sec = pTm.wSecond;
  return &y;
}
#endif





#define HANDLE_TO_WINFILE(a) (winFile*)&((char*)a)[-(int)offsetof(winFile,h)]

/*
** Acquire a lock on the handle h
*/
static void winceMutexAcquire(HANDLE h){
   DWORD dwErr;
................................................................................
  assert( locktype!=RESERVED_LOCK || pFile->locktype==SHARED_LOCK );

  /* Lock the PENDING_LOCK byte if we need to acquire a PENDING lock or
  ** a SHARED lock.  If we are acquiring a SHARED lock, the acquisition of
  ** the PENDING_LOCK byte is temporary.
  */
  newLocktype = pFile->locktype;
  if(   (pFile->locktype==NO_LOCK)
     || (   (locktype==EXCLUSIVE_LOCK)
         && (pFile->locktype==RESERVED_LOCK))
  ){
    int cnt = 3;
    while( cnt-->0 && (res = winLockFile(&pFile->h, SQLITE_LOCKFILE_FLAGS,
                                         PENDING_BYTE, 0, 1, 0))==0 ){
      /* Try 3 times to get the pending lock.  This is needed to work
      ** around problems caused by indexing and/or anti-virus software on
      ** Windows systems.
................................................................................
  }else{
    pShmNode = pNew;
    pNew = 0;
    ((winFile*)(&pShmNode->hFile))->h = INVALID_HANDLE_VALUE;
    pShmNode->pNext = winShmNodeList;
    winShmNodeList = pShmNode;


    pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
    if( pShmNode->mutex==0 ){
      rc = SQLITE_IOERR_NOMEM_BKPT;
      goto shm_open_err;

    }

    rc = winOpen(pDbFd->pVfs,
                 pShmNode->zFilename,             /* Name of the file (UTF-8) */
                 (sqlite3_file*)&pShmNode->hFile,  /* File handle here */
                 SQLITE_OPEN_WAL | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
                 0);
................................................................................
  assert( createFlag==0 || pCache->eCreate==eCreate );
  assert( createFlag==0 || eCreate==1+(!pCache->bPurgeable||!pCache->pDirty) );
  return sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, eCreate);
}

/*
** If the sqlite3PcacheFetch() routine is unable to allocate a new
** page because new clean pages are available for reuse and the cache
** size limit has been reached, then this routine can be invoked to 
** try harder to allocate a page.  This routine might invoke the stress
** callback to spill dirty pages to the journal.  It will then try to
** allocate the new page and will only fail to allocate a new page on
** an OOM error.
**
** This routine should be invoked only after sqlite3PcacheFetch() fails.
................................................................................
*/
SQLITE_PRIVATE void sqlite3PcacheCleanAll(PCache *pCache){
  PgHdr *p;
  while( (p = pCache->pDirty)!=0 ){
    sqlite3PcacheMakeClean(p);
  }
}












/*
** Clear the PGHDR_NEED_SYNC flag from all dirty pages.
*/
SQLITE_PRIVATE void sqlite3PcacheClearSyncFlags(PCache *pCache){
  PgHdr *p;
  for(p=pCache->pDirty; p; p=p->pDirtyNext){
................................................................................
    for(p=pCache->pDirty; p; p=pNext){
      pNext = p->pDirtyNext;
      /* This routine never gets call with a positive pgno except right
      ** after sqlite3PcacheCleanAll().  So if there are dirty pages,
      ** it must be that pgno==0.
      */
      assert( p->pgno>0 );
      if( ALWAYS(p->pgno>pgno) ){
        assert( p->flags&PGHDR_DIRTY );
        sqlite3PcacheMakeClean(p);
      }
    }
    if( pgno==0 && pCache->nRefSum ){
      sqlite3_pcache_page *pPage1;
      pPage1 = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache,1,0);
................................................................................

/*
** Return the size of the header added by this middleware layer
** in the page-cache hierarchy.
*/
SQLITE_PRIVATE int sqlite3HeaderSizePcache(void){ return ROUND8(sizeof(PgHdr)); }













#if defined(SQLITE_CHECK_PAGES) || defined(SQLITE_DEBUG)
/*
** For all dirty pages currently in the cache, invoke the specified
** callback. This is only used if the SQLITE_CHECK_PAGES macro is
** defined.
*/
................................................................................
                          || sqlite3GlobalConfig.bCoreMutex>0;
#else
  pcache1.separateCache = sqlite3GlobalConfig.pPage==0;
#endif

#if SQLITE_THREADSAFE
  if( sqlite3GlobalConfig.bCoreMutex ){
    pcache1.grp.mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_LRU);
    pcache1.mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_PMEM);
  }
#endif
  if( pcache1.separateCache
   && sqlite3GlobalConfig.nPage!=0
   && sqlite3GlobalConfig.pPage==0
  ){
    pcache1.nInitPage = sqlite3GlobalConfig.nPage;
................................................................................
** The cost of an INSERT is roughly constant.  (Sometimes new memory
** has to be allocated on an INSERT.)  The cost of a TEST with a new
** batch number is O(NlogN) where N is the number of elements in the RowSet.
** The cost of a TEST using the same batch number is O(logN).  The cost
** of the first SMALLEST is O(NlogN).  Second and subsequent SMALLEST
** primitives are constant time.  The cost of DESTROY is O(N).
**
** There is an added cost of O(N) when switching between TEST and
** SMALLEST primitives.

*/
/* #include "sqliteInt.h" */


/*
** Target size for allocation chunks.
*/
................................................................................
** objected.
**
** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){


    struct RowSetChunk *pNew;
    pNew = sqlite3DbMallocRawNN(p->db, sizeof(*pNew));
    if( pNew==0 ){
      return 0;
    }
    pNew->pNextChunk = p->pChunk;
    p->pChunk = pNew;
................................................................................

  pEntry = rowSetEntryAlloc(p);
  if( pEntry==0 ) return;
  pEntry->v = rowid;
  pEntry->pRight = 0;
  pLast = p->pLast;
  if( pLast ){
    if( (p->rsFlags & ROWSET_SORTED)!=0 && rowid<=pLast->v ){


      p->rsFlags &= ~ROWSET_SORTED;
    }
    pLast->pRight = pEntry;
  }else{
    p->pEntry = pEntry;
  }
  p->pLast = pEntry;
................................................................................
*/
static struct RowSetEntry *rowSetNDeepTree(
  struct RowSetEntry **ppList,
  int iDepth
){
  struct RowSetEntry *p;         /* Root of the new tree */
  struct RowSetEntry *pLeft;     /* Left subtree */
  if( *ppList==0 ){

    return 0;
  }
  if( iDepth==1 ){















    p = *ppList;
    *ppList = p->pRight;
    p->pLeft = p->pRight = 0;
    return p;
  }
  pLeft = rowSetNDeepTree(ppList, iDepth-1);
  p = *ppList;
  if( p==0 ){
    return pLeft;
  }
  p->pLeft = pLeft;
  *ppList = p->pRight;
  p->pRight = rowSetNDeepTree(ppList, iDepth-1);
  return p;
}

/*
** Convert a sorted list of elements into a binary tree. Make the tree
** as deep as it needs to be in order to contain the entire list.
*/
................................................................................
    pList = p->pRight;
    p->pLeft = pLeft;
    p->pRight = rowSetNDeepTree(&pList, iDepth);
  }
  return p;
}

/*
** Take all the entries on p->pEntry and on the trees in p->pForest and
** sort them all together into one big ordered list on p->pEntry.
**
** This routine should only be called once in the life of a RowSet.
*/
static void rowSetToList(RowSet *p){

  /* This routine is called only once */
  assert( p!=0 && (p->rsFlags & ROWSET_NEXT)==0 );

  if( (p->rsFlags & ROWSET_SORTED)==0 ){
    p->pEntry = rowSetEntrySort(p->pEntry);
  }

  /* While this module could theoretically support it, sqlite3RowSetNext()
  ** is never called after sqlite3RowSetText() for the same RowSet.  So
  ** there is never a forest to deal with.  Should this change, simply
  ** remove the assert() and the #if 0. */
  assert( p->pForest==0 );
#if 0
  while( p->pForest ){
    struct RowSetEntry *pTree = p->pForest->pLeft;
    if( pTree ){
      struct RowSetEntry *pHead, *pTail;
      rowSetTreeToList(pTree, &pHead, &pTail);
      p->pEntry = rowSetEntryMerge(p->pEntry, pHead);
    }
    p->pForest = p->pForest->pRight;
  }
#endif
  p->rsFlags |= ROWSET_NEXT;  /* Verify this routine is never called again */
}

/*
** Extract the smallest element from the RowSet.
** Write the element into *pRowid.  Return 1 on success.  Return
** 0 if the RowSet is already empty.
**
** After this routine has been called, the sqlite3RowSetInsert()
** routine may not be called again.  





*/
SQLITE_PRIVATE int sqlite3RowSetNext(RowSet *p, i64 *pRowid){
  assert( p!=0 );


  /* Merge the forest into a single sorted list on first call */
  if( (p->rsFlags & ROWSET_NEXT)==0 ) rowSetToList(p);






  /* Return the next entry on the list */
  if( p->pEntry ){
    *pRowid = p->pEntry->v;
    p->pEntry = p->pEntry->pRight;
    if( p->pEntry==0 ){

      sqlite3RowSetClear(p);
    }
    return 1;
  }else{
    return 0;
  }
}
................................................................................
*/
SQLITE_PRIVATE int sqlite3RowSetTest(RowSet *pRowSet, int iBatch, sqlite3_int64 iRowid){
  struct RowSetEntry *p, *pTree;

  /* This routine is never called after sqlite3RowSetNext() */
  assert( pRowSet!=0 && (pRowSet->rsFlags & ROWSET_NEXT)==0 );

  /* Sort entries into the forest on the first test of a new batch 

  */
  if( iBatch!=pRowSet->iBatch ){
    p = pRowSet->pEntry;
    if( p ){
      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){

        p = rowSetEntrySort(p);
      }
      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
        ppPrevTree = &pTree->pRight;
        if( pTree->pLeft==0 ){
          pTree->pLeft = rowSetListToTree(p);
          break;
................................................................................
  ** either SQLITE_IOERR or SQLITE_FULL during rollback or while finalizing 
  ** a journal file. (although the in-memory journal implementation may 
  ** return SQLITE_IOERR_NOMEM while the journal file is being written). It 
  ** is therefore not possible for an in-memory pager to enter the ERROR 
  ** state.
  */
  if( MEMDB ){

    assert( p->noSync );
    assert( p->journalMode==PAGER_JOURNALMODE_OFF 
         || p->journalMode==PAGER_JOURNALMODE_MEMORY 
    );
    assert( p->eState!=PAGER_ERROR && p->eState!=PAGER_OPEN );
    assert( pagerUseWal(p)==0 );
  }
................................................................................

    case PAGER_ERROR:
      /* There must be at least one outstanding reference to the pager if
      ** in ERROR state. Otherwise the pager should have already dropped
      ** back to OPEN state.
      */
      assert( pPager->errCode!=SQLITE_OK );
      assert( sqlite3PcacheRefCount(pPager->pPCache)>0 );
      break;
  }

  return 1;
}
#endif /* ifndef NDEBUG */

................................................................................
    if( 0==(dc&(SQLITE_IOCAP_ATOMIC|(szPage>>8)) || nSector>szPage) ){
      return 0;
    }
  }

  return JOURNAL_HDR_SZ(pPager) + JOURNAL_PG_SZ(pPager);
}


#endif

/*
** If SQLITE_CHECK_PAGES is defined then we do some sanity checking
** on the cache using a hash function.  This is used for testing
** and debugging only.
*/
................................................................................
  }

  /* If Pager.errCode is set, the contents of the pager cache cannot be
  ** trusted. Now that there are no outstanding references to the pager,
  ** it can safely move back to PAGER_OPEN state. This happens in both
  ** normal and exclusive-locking mode.
  */

  if( pPager->errCode ){
    assert( !MEMDB );

    pager_reset(pPager);
    pPager->changeCountDone = pPager->tempFile;
    pPager->eState = PAGER_OPEN;
    pPager->errCode = SQLITE_OK;



    if( USEFETCH(pPager) ) sqlite3OsUnfetch(pPager->fd, 0, 0);

  }

  pPager->journalOff = 0;
  pPager->journalHdr = 0;
  pPager->setMaster = 0;
}

................................................................................
    pPager->errCode = rc;
    pPager->eState = PAGER_ERROR;
  }
  return rc;
}

static int pager_truncate(Pager *pPager, Pgno nPage);




















/*
** This routine ends a transaction. A transaction is usually ended by 
** either a COMMIT or a ROLLBACK operation. This routine may be called 
** after rollback of a hot-journal, or if an error occurs while opening
** the journal file or writing the very first journal-header of a
** database transaction.
................................................................................
    }
  }
#endif

  sqlite3BitvecDestroy(pPager->pInJournal);
  pPager->pInJournal = 0;
  pPager->nRec = 0;

  sqlite3PcacheCleanAll(pPager->pPCache);



  sqlite3PcacheTruncate(pPager->pPCache, pPager->dbSize);

  if( pagerUseWal(pPager) ){
    /* Drop the WAL write-lock, if any. Also, if the connection was in 
    ** locking_mode=exclusive mode but is no longer, drop the EXCLUSIVE 
    ** lock held on the database file.
    */
................................................................................
  */
  if( pagerUseWal(pPager) ){
    pPg = 0;
  }else{
    pPg = sqlite3PagerLookup(pPager, pgno);
  }
  assert( pPg || !MEMDB );
  assert( pPager->eState!=PAGER_OPEN || pPg==0 );
  PAGERTRACE(("PLAYBACK %d page %d hash(%08x) %s\n",
           PAGERID(pPager), pgno, pager_datahash(pPager->pageSize, (u8*)aData),
           (isMainJrnl?"main-journal":"sub-journal")
  ));
  if( isMainJrnl ){
    isSynced = pPager->noSync || (*pOffset <= pPager->journalHdr);
  }else{
................................................................................
      ** already in the journal file (recorded in Pager.pInJournal) and
      ** the PGHDR_NEED_SYNC flag is cleared, if the page is written to
      ** again within this transaction, it will be marked as dirty but
      ** the PGHDR_NEED_SYNC flag will not be set. It could then potentially
      ** be written out into the database file before its journal file
      ** segment is synced. If a crash occurs during or following this,
      ** database corruption may ensue.




      */
      assert( !pagerUseWal(pPager) );
      sqlite3PcacheMakeClean(pPg);
    }
    pager_set_pagehash(pPg);

    /* If this was page 1, then restore the value of Pager.dbFileVers.
    ** Do this before any decoding. */
    if( pgno==1 ){
      memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
................................................................................
  ** function returns zero if the WAL is not open (i.e. Pager.pWal==0), or
  ** if the database size is not available. The database size is not
  ** available from the WAL sub-system if the log file is empty or
  ** contains no valid committed transactions.
  */
  assert( pPager->eState==PAGER_OPEN );
  assert( pPager->eLock>=SHARED_LOCK );


  nPage = sqlite3WalDbsize(pPager->pWal);

  /* If the number of pages in the database is not available from the
  ** WAL sub-system, determine the page counte based on the size of
  ** the database file.  If the size of the database file is not an
  ** integer multiple of the page-size, round up the result.
  */
  if( nPage==0 ){
    i64 n = 0;                    /* Size of db file in bytes */
    assert( isOpen(pPager->fd) || pPager->tempFile );
    if( isOpen(pPager->fd) ){
      int rc = sqlite3OsFileSize(pPager->fd, &n);
      if( rc!=SQLITE_OK ){
        return rc;
      }
    }
    nPage = (Pgno)((n+pPager->pageSize-1) / pPager->pageSize);
  }

  /* If the current number of pages in the file is greater than the
  ** configured maximum pager number, increase the allowed limit so
  ** that the file can be read.
................................................................................
** be obtained, SQLITE_BUSY is returned.
*/
static int pager_write_pagelist(Pager *pPager, PgHdr *pList){
  int rc = SQLITE_OK;                  /* Return code */

  /* This function is only called for rollback pagers in WRITER_DBMOD state. */
  assert( !pagerUseWal(pPager) );
  assert( pPager->eState==PAGER_WRITER_DBMOD );
  assert( pPager->eLock==EXCLUSIVE_LOCK );


  /* If the file is a temp-file has not yet been opened, open it now. It
  ** is not possible for rc to be other than SQLITE_OK if this branch
  ** is taken, as pager_wait_on_lock() is a no-op for temp-files.
  */
  if( !isOpen(pPager->fd) ){
    assert( pPager->tempFile && rc==SQLITE_OK );
................................................................................
    ** in fact there is none.  This results in a false-positive which will
    ** be dealt with by the playback routine.  Ticket #3883.
    */
    rc = sqlite3OsCheckReservedLock(pPager->fd, &locked);
    if( rc==SQLITE_OK && !locked ){
      Pgno nPage;                 /* Number of pages in database file */


      rc = pagerPagecount(pPager, &nPage);
      if( rc==SQLITE_OK ){
        /* If the database is zero pages in size, that means that either (1) the
        ** journal is a remnant from a prior database with the same name where
        ** the database file but not the journal was deleted, or (2) the initial
        ** transaction that populates a new database is being rolled back.
        ** In either case, the journal file can be deleted.  However, take care
................................................................................
*/
SQLITE_PRIVATE int sqlite3PagerSharedLock(Pager *pPager){
  int rc = SQLITE_OK;                /* Return code */

  /* This routine is only called from b-tree and only when there are no
  ** outstanding pages. This implies that the pager state should either
  ** be OPEN or READER. READER is only possible if the pager is or was in 
  ** exclusive access mode.
  */
  assert( sqlite3PcacheRefCount(pPager->pPCache)==0 );
  assert( assert_pager_state(pPager) );
  assert( pPager->eState==PAGER_OPEN || pPager->eState==PAGER_READER );
  if( NEVER(MEMDB && pPager->errCode) ){ return pPager->errCode; }

  if( !pagerUseWal(pPager) && pPager->eState==PAGER_OPEN ){
    int bHotJournal = 1;          /* True if there exists a hot journal-file */

    assert( !MEMDB );


    rc = pager_wait_on_lock(pPager, SHARED_LOCK);
    if( rc!=SQLITE_OK ){
      assert( pPager->eLock==NO_LOCK || pPager->eLock==UNKNOWN_LOCK );
      goto failed;
    }

................................................................................
      ** probably did not sync it and we are required to always sync
      ** the journal before playing it back.
      */
      if( isOpen(pPager->jfd) ){
        assert( rc==SQLITE_OK );
        rc = pagerSyncHotJournal(pPager);
        if( rc==SQLITE_OK ){
          rc = pager_playback(pPager, 1);
          pPager->eState = PAGER_OPEN;
        }
      }else if( !pPager->exclusiveMode ){
        pagerUnlockDb(pPager, SHARED_LOCK);
      }

      if( rc!=SQLITE_OK ){
................................................................................
  }

  if( pagerUseWal(pPager) ){
    assert( rc==SQLITE_OK );
    rc = pagerBeginReadTransaction(pPager);
  }

  if( pPager->eState==PAGER_OPEN && rc==SQLITE_OK ){
    rc = pagerPagecount(pPager, &pPager->dbSize);
  }

 failed:
  if( rc!=SQLITE_OK ){
    assert( !MEMDB );
    pager_unlock(pPager);
................................................................................
      void *pData = 0;

      rc = sqlite3OsFetch(pPager->fd, 
          (i64)(pgno-1) * pPager->pageSize, pPager->pageSize, &pData
      );

      if( rc==SQLITE_OK && pData ){
        if( pPager->eState>PAGER_READER ){
          pPg = sqlite3PagerLookup(pPager, pgno);
        }
        if( pPg==0 ){
          rc = pagerAcquireMapPage(pPager, pgno, pData, &pPg);
        }else{
          sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1)*pPager->pageSize, pData);
        }
................................................................................
    /* The maximum page number is 2^31. Return SQLITE_CORRUPT if a page
    ** number greater than this, or the unused locking-page, is requested. */
    if( pgno>PAGER_MAX_PGNO || pgno==PAGER_MJ_PGNO(pPager) ){
      rc = SQLITE_CORRUPT_BKPT;
      goto pager_acquire_err;
    }


    if( MEMDB || pPager->dbSize<pgno || noContent || !isOpen(pPager->fd) ){
      if( pgno>pPager->mxPgno ){
        rc = SQLITE_FULL;
        goto pager_acquire_err;
      }
      if( noContent ){
        /* Failure to set the bits in the InJournal bit-vectors is benign.
        ** It merely means that we might do some extra work to journal a 
................................................................................
    }
  
    /* Open the journal file if it is not already open. */
    if( !isOpen(pPager->jfd) ){
      if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ){
        sqlite3MemJournalOpen(pPager->jfd);
      }else{
        const int flags =                   /* VFS flags to open journal file */
          SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|


          (pPager->tempFile ? 
            (SQLITE_OPEN_DELETEONCLOSE|SQLITE_OPEN_TEMP_JOURNAL):


            (SQLITE_OPEN_MAIN_JOURNAL)
          );



        /* Verify that the database still has the same name as it did when
        ** it was originally opened. */
        rc = databaseIsUnmoved(pPager);
        if( rc==SQLITE_OK ){
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
          rc = sqlite3JournalOpen(
              pVfs, pPager->zJournal, pPager->jfd, flags, jrnlBufferSize(pPager)
          );
#else
          rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, flags, 0);
#endif
        }
      }
      assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
    }
  
  
    /* Write the first journal header to the journal file and open 
................................................................................
  assert( assert_pager_state(pPager) );
  if( pPager->errCode ){
    return pPager->errCode;
  }else if( (pPg->flags & PGHDR_WRITEABLE)!=0 && pPager->dbSize>=pPg->pgno ){
    if( pPager->nSavepoint ) return subjournalPageIfRequired(pPg);
    return SQLITE_OK;
  }else if( pPager->sectorSize > (u32)pPager->pageSize ){

    return pagerWriteLargeSector(pPg);
  }else{
    return pager_write(pPg);
  }
}

/*
................................................................................
       || pPager->eState==PAGER_WRITER_DBMOD
       || pPager->eState==PAGER_ERROR
  );
  assert( assert_pager_state(pPager) );

  /* If a prior error occurred, report that error again. */
  if( NEVER(pPager->errCode) ) return pPager->errCode;




  PAGERTRACE(("DATABASE SYNC: File=%s zMaster=%s nSize=%d\n", 
      pPager->zFilename, zMaster, pPager->dbSize));

  /* If no database changes have been made, return early. */
  if( pPager->eState<PAGER_WRITER_CACHEMOD ) return SQLITE_OK;

  if( MEMDB ){


    /* If this is an in-memory db, or no pages have been written to, or this
    ** function has already been called, it is mostly a no-op.  However, any
    ** backup in progress needs to be restarted.
    */
    sqlite3BackupRestart(pPager->pBackup);
  }else{
    if( pagerUseWal(pPager) ){
      PgHdr *pList = sqlite3PcacheDirtyList(pPager->pPCache);
      PgHdr *pPageOne = 0;
      if( pList==0 ){
        /* Must have at least one page for the WAL commit flag.
................................................................................
  *pnVal += pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT];
  if( reset ){
    pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT] = 0;
  }
}

/*
** Return true if this is an in-memory pager.
*/
SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager *pPager){
  return MEMDB;
}

/*
** Check that there are at least nSavepoint savepoints open. If there are
** currently less than nSavepoints open, then open one or more savepoints
** to make up the difference. If the number of savepoints is already
** equal to nSavepoint, then this function is a no-op.
................................................................................
       || pPager->eState==PAGER_WRITER_DBMOD
  );
  assert( assert_pager_state(pPager) );

  /* In order to be able to rollback, an in-memory database must journal
  ** the page we are moving from.
  */
  if( MEMDB ){
    rc = sqlite3PagerWrite(pPg);
    if( rc ) return rc;
  }

  /* If the page being moved is dirty and has not been saved by the latest
  ** savepoint, then save the current contents of the page into the 
  ** sub-journal now. This is required to handle the following scenario:
................................................................................
  ** for the page moved there.
  */
  pPg->flags &= ~PGHDR_NEED_SYNC;
  pPgOld = sqlite3PagerLookup(pPager, pgno);
  assert( !pPgOld || pPgOld->nRef==1 );
  if( pPgOld ){
    pPg->flags |= (pPgOld->flags&PGHDR_NEED_SYNC);
    if( MEMDB ){
      /* Do not discard pages from an in-memory database since we might
      ** need to rollback later.  Just move the page out of the way. */
      sqlite3PcacheMove(pPgOld, pPager->dbSize+1);
    }else{
      sqlite3PcacheDrop(pPgOld);
    }
  }
................................................................................
  sqlite3PcacheMove(pPg, pgno);
  sqlite3PcacheMakeDirty(pPg);

  /* For an in-memory database, make sure the original page continues
  ** to exist, in case the transaction needs to roll back.  Use pPgOld
  ** as the original page since it has already been allocated.
  */
  if( MEMDB ){
    assert( pPgOld );
    sqlite3PcacheMove(pPgOld, origPgno);
    sqlite3PagerUnrefNotNull(pPgOld);
  }

  if( needSyncPgno ){
    /* If needSyncPgno is non-zero, then the journal file needs to be 
................................................................................
}

#ifndef SQLITE_OMIT_VACUUM
/*
** Unless this is an in-memory or temporary database, clear the pager cache.
*/
SQLITE_PRIVATE void sqlite3PagerClearCache(Pager *pPager){

  if( !MEMDB && pPager->tempFile==0 ) pager_reset(pPager);
}
#endif

#ifndef SQLITE_OMIT_WAL
/*
** This function is called when the user invokes "PRAGMA wal_checkpoint",
** "PRAGMA wal_blocking_checkpoint" or calls the sqlite3_wal_checkpoint()
................................................................................
  if( rc==SQLITE_OK && pPager->pWal ){
    rc = pagerExclusiveLock(pPager);
    if( rc==SQLITE_OK ){
      rc = sqlite3WalClose(pPager->pWal, pPager->ckptSyncFlags,
                           pPager->pageSize, (u8*)pPager->pTmpSpace);
      pPager->pWal = 0;
      pagerFixMaplimit(pPager);

    }
  }
  return rc;
}

#ifdef SQLITE_ENABLE_SNAPSHOT
/*
................................................................................
}

/* Try to open on pSnapshot when the next read-transaction starts
*/
SQLITE_PRIVATE void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot){
  pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
}

















#endif /* SQLITE_ENABLE_SNAPSHOT */

#ifdef SQLITE_ENABLE_ZIPVFS
/*
** If the argument is not NULL, it points to a Wal object that holds a
** read-lock. This function returns the database page-size if it is known,
** or zero if it is not (or if pWal is NULL).
................................................................................
  assert( pCur->eState==CURSOR_VALID );
  assert( (flags & ~(BTREE_SAVEPOSITION | BTREE_AUXDELETE))==0 );

  iCellDepth = pCur->iPage;
  iCellIdx = pCur->aiIdx[iCellDepth];
  pPage = pCur->apPage[iCellDepth];
  pCell = findCell(pPage, iCellIdx);























  /* If the page containing the entry to delete is not a leaf page, move
  ** the cursor to the largest entry in the tree that is smaller than
  ** the entry being deleted. This cell will replace the cell being deleted
  ** from the internal node. The 'previous' entry is used for this instead
  ** of the 'next' entry, as the previous entry is always a part of the
  ** sub-tree headed by the child page of the cell being deleted. This makes
................................................................................

  /* If this is a delete operation to remove a row from a table b-tree,
  ** invalidate any incrblob cursors open on the row being deleted.  */
  if( pCur->pKeyInfo==0 ){
    invalidateIncrblobCursors(p, pCur->info.nKey, 0);
  }

  /* If the bPreserve flag is set to true, then the cursor position must
  ** be preserved following this delete operation. If the current delete
  ** will cause a b-tree rebalance, then this is done by saving the cursor
  ** key and leaving the cursor in CURSOR_REQUIRESEEK state before 
  ** returning. 
  **
  ** Or, if the current delete will not cause a rebalance, then the cursor
  ** will be left in CURSOR_SKIPNEXT state pointing to the entry immediately
  ** before or after the deleted entry. In this case set bSkipnext to true.  */
  if( bPreserve ){
    if( !pPage->leaf 
     || (pPage->nFree+cellSizePtr(pPage,pCell)+2)>(int)(pBt->usableSize*2/3)
    ){
      /* A b-tree rebalance will be required after deleting this entry.
      ** Save the cursor key.  */
      rc = saveCursorKey(pCur);
      if( rc ) return rc;
    }else{
      bSkipnext = 1;
    }
  }

  /* Make the page containing the entry to be deleted writable. Then free any
  ** overflow pages associated with the entry and finally remove the cell
  ** itself from within the page.  */
  rc = sqlite3PagerWrite(pPage->pDbPage);
  if( rc ) return rc;
  rc = clearCell(pPage, pCell, &szCell);
  dropCell(pPage, iCellIdx, szCell, &rc);
................................................................................
**
** (3) Update the Vdbe.readOnly and Vdbe.bIsReader flags to accurately
**     indicate what the prepared statement actually does.
**
** (4) Initialize the p4.xAdvance pointer on opcodes that use it.
**
** (5) Reclaim the memory allocated for storing labels.




*/
static void resolveP2Values(Vdbe *p, int *pMaxFuncArgs){
  int i;
  int nMaxArgs = *pMaxFuncArgs;
  Op *pOp;
  Parse *pParse = p->pParse;
  int *aLabel = pParse->aLabel;
  p->readOnly = 1;
  p->bIsReader = 0;
  for(pOp=p->aOp, i=p->nOp-1; i>=0; i--, pOp++){
    u8 opcode = pOp->opcode;










    /* NOTE: Be sure to update mkopcodeh.tcl when adding or removing
    ** cases from this switch! */
    switch( opcode ){
      case OP_Transaction: {
        if( pOp->p2!=0 ) p->readOnly = 0;
        /* fall thru */
      }
      case OP_AutoCommit:
      case OP_Savepoint: {
        p->bIsReader = 1;
        break;
      }
#ifndef SQLITE_OMIT_WAL
      case OP_Checkpoint:
#endif
      case OP_Vacuum:
      case OP_JournalMode: {
        p->readOnly = 0;
        p->bIsReader = 1;
        break;
      }
#ifndef SQLITE_OMIT_VIRTUALTABLE
      case OP_VUpdate: {
        if( pOp->p2>nMaxArgs ) nMaxArgs = pOp->p2;
        break;
      }
      case OP_VFilter: {
        int n;
        assert( p->nOp - i >= 3 );

        assert( pOp[-1].opcode==OP_Integer );
        n = pOp[-1].p1;
        if( n>nMaxArgs ) nMaxArgs = n;
        break;
      }
#endif
      case OP_Next:
      case OP_NextIfOpen:
      case OP_SorterNext: {
        pOp->p4.xAdvance = sqlite3BtreeNext;
        pOp->p4type = P4_ADVANCE;
        break;
      }
      case OP_Prev:
      case OP_PrevIfOpen: {
        pOp->p4.xAdvance = sqlite3BtreePrevious;
        pOp->p4type = P4_ADVANCE;
        break;
      }
    }

    pOp->opflags = sqlite3OpcodeProperty[opcode];
    if( (pOp->opflags & OPFLG_JUMP)!=0 && pOp->p2<0 ){
      assert( ADDR(pOp->p2)<pParse->nLabel );
      pOp->p2 = aLabel[ADDR(pOp->p2)];
    }



  }
  sqlite3DbFree(p->db, pParse->aLabel);
  pParse->aLabel = 0;
  pParse->nLabel = 0;
  *pMaxFuncArgs = nMaxArgs;
  assert( p->bIsReader!=0 || DbMaskAllZero(p->btreeMask) );
}
................................................................................
  int nByte;
  VdbeCursor *pCx = 0;
  nByte = 
      ROUND8(sizeof(VdbeCursor)) + 2*sizeof(u32)*nField + 
      (eCurType==CURTYPE_BTREE?sqlite3BtreeCursorSize():0);

  assert( iCur>=0 && iCur<p->nCursor );
  if( p->apCsr[iCur] ){
    sqlite3VdbeFreeCursor(p, p->apCsr[iCur]);
    p->apCsr[iCur] = 0;
  }
  if( SQLITE_OK==sqlite3VdbeMemClearAndResize(pMem, nByte) ){
    p->apCsr[iCur] = pCx = (VdbeCursor*)pMem->z;
    memset(pCx, 0, sizeof(VdbeCursor));
    pCx->eCurType = eCurType;
................................................................................
  Mem *pRec,          /* The value to apply affinity to */
  char affinity,      /* The affinity to be applied */
  u8 enc              /* Use this text encoding */
){
  if( affinity>=SQLITE_AFF_NUMERIC ){
    assert( affinity==SQLITE_AFF_INTEGER || affinity==SQLITE_AFF_REAL
             || affinity==SQLITE_AFF_NUMERIC );
    if( (pRec->flags & MEM_Int)==0 ){
      if( (pRec->flags & MEM_Real)==0 ){
        if( pRec->flags & MEM_Str ) applyNumericAffinity(pRec,1);
      }else{
        sqlite3VdbeIntegerAffinity(pRec);
      }
    }
  }else if( affinity==SQLITE_AFF_TEXT ){
    /* Only attempt the conversion to TEXT if there is an integer or real
    ** representation (blob and NULL do not get converted) but no string
    ** representation.
    */


    if( 0==(pRec->flags&MEM_Str) && (pRec->flags&(MEM_Real|MEM_Int)) ){
      sqlite3VdbeMemStringify(pRec, enc, 1);

    }
    pRec->flags &= ~(MEM_Real|MEM_Int);
  }
}

/*
** Try to convert the type of a function argument or a result column
................................................................................
}
static Mem *out2Prerelease(Vdbe *p, VdbeOp *pOp){
  Mem *pOut;
  assert( pOp->p2>0 );
  assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
  pOut = &p->aMem[pOp->p2];
  memAboutToChange(p, pOut);
  if( VdbeMemDynamic(pOut) ){
    return out2PrereleaseWithClear(pOut);
  }else{
    pOut->flags = MEM_Int;
    return pOut;
  }
}

................................................................................
        sqlite3_interrupt(db);
      }
    }
#endif

    /* Sanity checking on other operands */
#ifdef SQLITE_DEBUG

    assert( pOp->opflags==sqlite3OpcodeProperty[pOp->opcode] );
    if( (pOp->opflags & OPFLG_IN1)!=0 ){
      assert( pOp->p1>0 );
      assert( pOp->p1<=(p->nMem+1 - p->nCursor) );
      assert( memIsValid(&aMem[pOp->p1]) );
      assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p1]) );
      REGISTER_TRACE(pOp->p1, &aMem[pOp->p1]);
    }
    if( (pOp->opflags & OPFLG_IN2)!=0 ){
      assert( pOp->p2>0 );
      assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
      assert( memIsValid(&aMem[pOp->p2]) );
      assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p2]) );
      REGISTER_TRACE(pOp->p2, &aMem[pOp->p2]);
    }
    if( (pOp->opflags & OPFLG_IN3)!=0 ){
      assert( pOp->p3>0 );
      assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
      assert( memIsValid(&aMem[pOp->p3]) );
      assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p3]) );
      REGISTER_TRACE(pOp->p3, &aMem[pOp->p3]);
    }
    if( (pOp->opflags & OPFLG_OUT2)!=0 ){
      assert( pOp->p2>0 );
      assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
      memAboutToChange(p, &aMem[pOp->p2]);
    }
    if( (pOp->opflags & OPFLG_OUT3)!=0 ){
      assert( pOp->p3>0 );
      assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
      memAboutToChange(p, &aMem[pOp->p3]);

    }
#endif
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
    pOrigOp = pOp;
#endif
  
    switch( pOp->opcode ){
................................................................................
** omitted.
**
** There is an implied "Halt 0 0 0" instruction inserted at the very end of
** every program.  So a jump past the last instruction of the program
** is the same as executing Halt.
*/
case OP_Halt: {
  const char *zType;
  const char *zLogFmt;
  VdbeFrame *pFrame;
  int pcx;

  pcx = (int)(pOp - aOp);
  if( pOp->p1==SQLITE_OK && p->pFrame ){
    /* Halt the sub-program. Return control to the parent frame. */
    pFrame = p->pFrame;
................................................................................
    aMem = p->aMem;
    pOp = &aOp[pcx];
    break;
  }
  p->rc = pOp->p1;
  p->errorAction = (u8)pOp->p2;
  p->pc = pcx;

  if( p->rc ){
    if( pOp->p5 ){
      static const char * const azType[] = { "NOT NULL", "UNIQUE", "CHECK",
                                             "FOREIGN KEY" };
      assert( pOp->p5>=1 && pOp->p5<=4 );
      testcase( pOp->p5==1 );
      testcase( pOp->p5==2 );
      testcase( pOp->p5==3 );
      testcase( pOp->p5==4 );
      zType = azType[pOp->p5-1];
    }else{
      zType = 0;
    }
    assert( zType!=0 || pOp->p4.z!=0 );
    zLogFmt = "abort at %d in [%s]: %s";
    if( zType && pOp->p4.z ){
      sqlite3VdbeError(p, "%s constraint failed: %s", zType, pOp->p4.z);
    }else if( pOp->p4.z ){
      sqlite3VdbeError(p, "%s", pOp->p4.z);


    }else{
      sqlite3VdbeError(p, "%s constraint failed", zType);
    }
    sqlite3_log(pOp->p1, zLogFmt, pcx, p->zSql, p->zErrMsg);
  }
  rc = sqlite3VdbeHalt(p);
  assert( rc==SQLITE_BUSY || rc==SQLITE_OK || rc==SQLITE_ERROR );
  if( rc==SQLITE_BUSY ){
    p->rc = rc = SQLITE_BUSY;
  }else{
    assert( rc==SQLITE_OK || (p->rc&0xff)==SQLITE_CONSTRAINT );
    assert( rc==SQLITE_OK || db->nDeferredCons>0 || db->nDeferredImmCons>0 );
    rc = p->rc ? SQLITE_ERROR : SQLITE_DONE;
  }
  goto vdbe_return;
}
................................................................................
  pOut = out2Prerelease(p, pOp);
  pOp->opcode = OP_String;
  pOp->p1 = sqlite3Strlen30(pOp->p4.z);

#ifndef SQLITE_OMIT_UTF16
  if( encoding!=SQLITE_UTF8 ){
    rc = sqlite3VdbeMemSetStr(pOut, pOp->p4.z, -1, SQLITE_UTF8, SQLITE_STATIC);
    if( rc ){
      assert( rc==SQLITE_TOOBIG ); /* This is the only possible error here */
      goto too_big;
    }
    if( SQLITE_OK!=sqlite3VdbeChangeEncoding(pOut, encoding) ) goto no_mem;
    assert( pOut->szMalloc>0 && pOut->zMalloc==pOut->z );
    assert( VdbeMemDynamic(pOut)==0 );
    pOut->szMalloc = 0;
    pOut->flags |= MEM_Static;
    if( pOp->p4type==P4_DYNAMIC ){
      sqlite3DbFree(db, pOp->p4.z);
    }
    pOp->p4type = P4_DYNAMIC;
    pOp->p4.z = pOut->z;
    pOp->p1 = pOut->n;
  }

#endif
  if( pOp->p1>db->aLimit[SQLITE_LIMIT_LENGTH] ){
    goto too_big;
  }

  /* Fall through to the next case, OP_String */
}
  
/* Opcode: String P1 P2 P3 P4 P5
** Synopsis: r[P2]='P4' (len=P1)
**
** The string value P4 of length P1 (bytes) is stored in register P2.
**
** If P5!=0 and the content of register P3 is greater than zero, then
** the datatype of the register P2 is converted to BLOB.  The content is
** the same sequence of bytes, it is merely interpreted as a BLOB instead
** of a string, as if it had been CAST.


*/
case OP_String: {          /* out2 */
  assert( pOp->p4.z!=0 );
  pOut = out2Prerelease(p, pOp);
  pOut->flags = MEM_Str|MEM_Static|MEM_Term;
  pOut->z = pOp->p4.z;
  pOut->n = pOp->p1;
  pOut->enc = encoding;
  UPDATE_MAX_BLOBSIZE(pOut);
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
  if( pOp->p5 ){
    assert( pOp->p3>0 );
    assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
    pIn3 = &aMem[pOp->p3];
    assert( pIn3->flags & MEM_Int );
    if( pIn3->u.i ) pOut->flags = MEM_Blob|MEM_Static|MEM_Term;
  }
#endif
  break;
}

/* Opcode: Null P1 P2 P3 * *
** Synopsis:  r[P2..P3]=NULL
................................................................................
  pIn1->u.i--;
  VdbeBranchTaken(pIn1->u.i==0, 2);
  if( pIn1->u.i==0 ) goto jump_to_p2;
  break;
}


/* Opcode: JumpZeroIncr P1 P2 * * *
** Synopsis: if (r[P1]++)==0 ) goto P2
**
** The register P1 must contain an integer.  If register P1 is initially
** zero, then jump to P2.  Increment register P1 regardless of whether or
** not the jump is taken.
*/
case OP_JumpZeroIncr: {        /* jump, in1 */
  pIn1 = &aMem[pOp->p1];
  assert( pIn1->flags&MEM_Int );
  VdbeBranchTaken(pIn1->u.i==0, 2);
  if( (pIn1->u.i++)==0 ) goto jump_to_p2;
  break;
}

/* Opcode: AggStep0 * P2 P3 P4 P5
** Synopsis: accum=r[P3] step(r[P2@P5])
**
** Execute the step function for an aggregate.  The
** function has P5 arguments.   P4 is a pointer to the FuncDef
** structure that specifies the function.  Register P3 is the
** accumulator.
................................................................................
    ** the evaluator loop.  So we can leave it out when NDEBUG is defined.
    */
#ifndef NDEBUG
    assert( pOp>=&aOp[-1] && pOp<&aOp[p->nOp-1] );

#ifdef SQLITE_DEBUG
    if( db->flags & SQLITE_VdbeTrace ){

      if( rc!=0 ) printf("rc=%d\n",rc);
      if( pOrigOp->opflags & (OPFLG_OUT2) ){
        registerTrace(pOrigOp->p2, &aMem[pOrigOp->p2]);
      }
      if( pOrigOp->opflags & OPFLG_OUT3 ){
        registerTrace(pOrigOp->p3, &aMem[pOrigOp->p3]);
      }
    }
#endif  /* SQLITE_DEBUG */
#endif  /* NDEBUG */
  }  /* The end of the for(;;) loop the loops through opcodes */

................................................................................
SQLITE_PRIVATE int sqlite3VdbeSorterInit(
  sqlite3 *db,                    /* Database connection (for malloc()) */
  int nField,                     /* Number of key fields in each record */
  VdbeCursor *pCsr                /* Cursor that holds the new sorter */
){
  int pgsz;                       /* Page size of main database */
  int i;                          /* Used to iterate through aTask[] */
  int mxCache;                    /* Cache size */
  VdbeSorter *pSorter;            /* The new sorter */
  KeyInfo *pKeyInfo;              /* Copy of pCsr->pKeyInfo with db==0 */
  int szKeyInfo;                  /* Size of pCsr->pKeyInfo in bytes */
  int sz;                         /* Size of pSorter in bytes */
  int rc = SQLITE_OK;
#if SQLITE_MAX_WORKER_THREADS==0
# define nWorker 0
................................................................................
    pSorter->db = db;
    for(i=0; i<pSorter->nTask; i++){
      SortSubtask *pTask = &pSorter->aTask[i];
      pTask->pSorter = pSorter;
    }

    if( !sqlite3TempInMemory(db) ){

      u32 szPma = sqlite3GlobalConfig.szPma;
      pSorter->mnPmaSize = szPma * pgsz;

      mxCache = db->aDb[0].pSchema->cache_size;
      if( mxCache<(int)szPma ) mxCache = (int)szPma;






      pSorter->mxPmaSize = MIN((i64)mxCache*pgsz, SQLITE_MAX_PMASZ);


      /* EVIDENCE-OF: R-26747-61719 When the application provides any amount of
      ** scratch memory using SQLITE_CONFIG_SCRATCH, SQLite avoids unnecessary
      ** large heap allocations.
      */
      if( sqlite3GlobalConfig.pScratch==0 ){
        assert( pSorter->iMemory==0 );
................................................................................
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains code use to implement an in-memory rollback journal.
** The in-memory rollback journal is used to journal transactions for
** ":memory:" databases and when the journal_mode=MEMORY pragma is used.









*/
/* #include "sqliteInt.h" */

/* Forward references to internal structures */
typedef struct MemJournal MemJournal;
typedef struct FilePoint FilePoint;
typedef struct FileChunk FileChunk;
................................................................................
    pNew->op = (u8)op;
    pNew->iAgg = -1;
    if( pToken ){
      if( nExtra==0 ){
        pNew->flags |= EP_IntValue;
        pNew->u.iValue = iValue;
      }else{
        int c;
        pNew->u.zToken = (char*)&pNew[1];
        assert( pToken->z!=0 || pToken->n==0 );
        if( pToken->n ) memcpy(pNew->u.zToken, pToken->z, pToken->n);
        pNew->u.zToken[pToken->n] = 0;
        if( dequote && nExtra>=3 
             && ((c = pToken->z[0])=='\'' || c=='"' || c=='[' || c=='`') ){
          sqlite3Dequote(pNew->u.zToken);
          if( c=='"' ) pNew->flags |= EP_DblQuoted;
        }
      }
    }
#if SQLITE_MAX_EXPR_DEPTH>0
    pNew->nHeight = 1;
#endif  
  }
................................................................................
    sqlite3ExprAttachSubtrees(pParse->db, p, pLeft, pRight);
  }
  if( p ) {
    sqlite3ExprCheckHeight(pParse, p->nHeight);
  }
  return p;
}

















/*
** If the expression is always either TRUE or FALSE (respectively),
** then return 1.  If one cannot determine the truth value of the
** expression at compile-time return 0.
**
** This is an optimization.  If is OK to return 0 here even if
................................................................................
    sqlite3ErrorMsg(pParse, "too many SQL variables");
  }
}

/*
** Recursively delete an expression tree.
*/
SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3 *db, Expr *p){
  if( p==0 ) return;
  /* Sanity check: Assert that the IntValue is non-negative if it exists */
  assert( !ExprHasProperty(p, EP_IntValue) || p->u.iValue>=0 );
  if( !ExprHasProperty(p, EP_TokenOnly) ){
    /* The Expr.x union is never used at the same time as Expr.pRight */
    assert( p->x.pList==0 || p->pRight==0 );
    sqlite3ExprDelete(db, p->pLeft);
    sqlite3ExprDelete(db, p->pRight);
................................................................................
    }else{
      sqlite3ExprListDelete(db, p->x.pList);
    }
  }
  if( !ExprHasProperty(p, EP_Static) ){
    sqlite3DbFree(db, p);
  }



}

/*
** Return the number of bytes allocated for the expression structure 
** passed as the first argument. This is always one of EXPR_FULLSIZE,
** EXPR_REDUCEDSIZE or EXPR_TOKENONLYSIZE.
*/
................................................................................
** to enforce this constraint.
*/
static int dupedExprStructSize(Expr *p, int flags){
  int nSize;
  assert( flags==EXPRDUP_REDUCE || flags==0 ); /* Only one flag value allowed */
  assert( EXPR_FULLSIZE<=0xfff );
  assert( (0xfff & (EP_Reduced|EP_TokenOnly))==0 );
  if( 0==(flags&EXPRDUP_REDUCE) ){
    nSize = EXPR_FULLSIZE;
  }else{
    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
    assert( !ExprHasProperty(p, EP_FromJoin) ); 
    assert( !ExprHasProperty(p, EP_MemToken) );
    assert( !ExprHasProperty(p, EP_NoReduce) );
    if( p->pLeft || p->x.pList ){
................................................................................
** This function is similar to sqlite3ExprDup(), except that if pzBuffer 
** is not NULL then *pzBuffer is assumed to point to a buffer large enough 
** to store the copy of expression p, the copies of p->u.zToken
** (if applicable), and the copies of the p->pLeft and p->pRight expressions,
** if any. Before returning, *pzBuffer is set to the first byte past the
** portion of the buffer copied into by this function.
*/
static Expr *exprDup(sqlite3 *db, Expr *p, int flags, u8 **pzBuffer){
  Expr *pNew = 0;                      /* Value to return */
  assert( flags==0 || flags==EXPRDUP_REDUCE );


  assert( db!=0 );
  if( p ){
    const int isReduced = (flags&EXPRDUP_REDUCE);
    u8 *zAlloc;
    u32 staticFlag = 0;

    assert( pzBuffer==0 || isReduced );

    /* Figure out where to write the new Expr structure. */
    if( pzBuffer ){
      zAlloc = *pzBuffer;
      staticFlag = EP_Static;
    }else{
      zAlloc = sqlite3DbMallocRawNN(db, dupedExprSize(p, flags));

    }
    pNew = (Expr *)zAlloc;

    if( pNew ){
      /* Set nNewSize to the size allocated for the structure pointed to
      ** by pNew. This is either EXPR_FULLSIZE, EXPR_REDUCEDSIZE or
      ** EXPR_TOKENONLYSIZE. nToken is set to the number of bytes consumed
      ** by the copy of the p->u.zToken string (if any).
      */
      const unsigned nStructSize = dupedExprStructSize(p, flags);
      const int nNewSize = nStructSize & 0xfff;
      int nToken;
      if( !ExprHasProperty(p, EP_IntValue) && p->u.zToken ){
        nToken = sqlite3Strlen30(p->u.zToken) + 1;
      }else{
        nToken = 0;
      }
      if( isReduced ){
        assert( ExprHasProperty(p, EP_Reduced)==0 );
        memcpy(zAlloc, p, nNewSize);
      }else{
        u32 nSize = (u32)exprStructSize(p);
        memcpy(zAlloc, p, nSize);
        if( nSize<EXPR_FULLSIZE ){ 
          memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
        }
      }

      /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
      pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static|EP_MemToken);
      pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
      pNew->flags |= staticFlag;

      /* Copy the p->u.zToken string, if any. */
      if( nToken ){
        char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
        memcpy(zToken, p->u.zToken, nToken);
      }

      if( 0==((p->flags|pNew->flags) & EP_TokenOnly) ){
        /* Fill in the pNew->x.pSelect or pNew->x.pList member. */
        if( ExprHasProperty(p, EP_xIsSelect) ){
          pNew->x.pSelect = sqlite3SelectDup(db, p->x.pSelect, isReduced);
        }else{
          pNew->x.pList = sqlite3ExprListDup(db, p->x.pList, isReduced);
        }
      }

      /* Fill in pNew->pLeft and pNew->pRight. */
      if( ExprHasProperty(pNew, EP_Reduced|EP_TokenOnly) ){
        zAlloc += dupedExprNodeSize(p, flags);
        if( ExprHasProperty(pNew, EP_Reduced) ){

          pNew->pLeft = exprDup(db, p->pLeft, EXPRDUP_REDUCE, &zAlloc);

          pNew->pRight = exprDup(db, p->pRight, EXPRDUP_REDUCE, &zAlloc);
        }
        if( pzBuffer ){
          *pzBuffer = zAlloc;
        }
      }else{
        if( !ExprHasProperty(p, EP_TokenOnly) ){
          pNew->pLeft = sqlite3ExprDup(db, p->pLeft, 0);
          pNew->pRight = sqlite3ExprDup(db, p->pRight, 0);
        }
      }

    }
  }
  return pNew;
}

/*
** Create and return a deep copy of the object passed as the second 
................................................................................
** The flags parameter contains a combination of the EXPRDUP_XXX flags.
** If the EXPRDUP_REDUCE flag is set, then the structure returned is a
** truncated version of the usual Expr structure that will be stored as
** part of the in-memory representation of the database schema.
*/
SQLITE_PRIVATE Expr *sqlite3ExprDup(sqlite3 *db, Expr *p, int flags){
  assert( flags==0 || flags==EXPRDUP_REDUCE );
  return exprDup(db, p, flags, 0);
}
SQLITE_PRIVATE ExprList *sqlite3ExprListDup(sqlite3 *db, ExprList *p, int flags){
  ExprList *pNew;
  struct ExprList_item *pItem, *pOldItem;
  int i;
  assert( db!=0 );
  if( p==0 ) return 0;
................................................................................
  assert( pList!=0 || pParse->db->mallocFailed!=0 );
  if( pList ){
    struct ExprList_item *pItem;
    assert( pList->nExpr>0 );
    pItem = &pList->a[pList->nExpr-1];
    assert( pItem->zName==0 );
    pItem->zName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);
    if( dequote && pItem->zName ) sqlite3Dequote(pItem->zName);
  }
}

/*
** Set the ExprList.a[].zSpan element of the most recently added item
** on the expression list.
**
................................................................................
    sqlite3ErrorMsg(pParse, "too many columns in %s", zObject);
  }
}

/*
** Delete an entire expression list.
*/
SQLITE_PRIVATE void sqlite3ExprListDelete(sqlite3 *db, ExprList *pList){
  int i;
  struct ExprList_item *pItem;
  if( pList==0 ) return;
  assert( pList->a!=0 || pList->nExpr==0 );
  for(pItem=pList->a, i=0; i<pList->nExpr; i++, pItem++){
    sqlite3ExprDelete(db, pItem->pExpr);
    sqlite3DbFree(db, pItem->zName);
    sqlite3DbFree(db, pItem->zSpan);
  }
  sqlite3DbFree(db, pList->a);
  sqlite3DbFree(db, pList);



}

/*
** Return the bitwise-OR of all Expr.flags fields in the given
** ExprList.
*/
SQLITE_PRIVATE u32 sqlite3ExprListFlags(const ExprList *pList){
................................................................................
        codeReal(v, z, negFlag, iMem);
      }
#endif
    }
  }
}














/*
** Clear a cache entry.
*/
static void cacheEntryClear(Parse *pParse, struct yColCache *p){
  if( p->tempReg ){
    if( pParse->nTempReg<ArraySize(pParse->aTempReg) ){
      pParse->aTempReg[pParse->nTempReg++] = p->iReg;
    }
    p->tempReg = 0;
  }



}


/*
** Record in the column cache that a particular column from a
** particular table is stored in a particular register.
*/
................................................................................
    if( p->iReg==0 ){
      p->iLevel = pParse->iCacheLevel;
      p->iTable = iTab;
      p->iColumn = iCol;
      p->iReg = iReg;
      p->tempReg = 0;
      p->lru = pParse->iCacheCnt++;


      return;
    }
  }

  /* Replace the last recently used */
  minLru = 0x7fffffff;
  idxLru = -1;
................................................................................
    p = &pParse->aColCache[idxLru];
    p->iLevel = pParse->iCacheLevel;
    p->iTable = iTab;
    p->iColumn = iCol;
    p->iReg = iReg;
    p->tempReg = 0;
    p->lru = pParse->iCacheCnt++;

    return;
  }
}

/*
** Indicate that registers between iReg..iReg+nReg-1 are being overwritten.
** Purge the range of registers from the column cache.
*/
SQLITE_PRIVATE void sqlite3ExprCacheRemove(Parse *pParse, int iReg, int nReg){
  int i;
  int iLast = iReg + nReg - 1;
  struct yColCache *p;
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    int r = p->iReg;
    if( r>=iReg && r<=iLast ){
      cacheEntryClear(pParse, p);
      p->iReg = 0;
    }
  }
}

/*
** Remember the current column cache context.  Any new entries added
** added to the column cache after this call are removed when the
** corresponding pop occurs.
................................................................................
  if( pParse->db->flags & SQLITE_VdbeAddopTrace ){
    printf("POP  to %d\n", pParse->iCacheLevel);
  }
#endif
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg && p->iLevel>pParse->iCacheLevel ){
      cacheEntryClear(pParse, p);
      p->iReg = 0;
    }
  }
}

/*
** When a cached column is reused, make sure that its register is
** no longer available as a temp register.  ticket #3879:  that same
................................................................................
  if( pParse->db->flags & SQLITE_VdbeAddopTrace ){
    printf("CLEAR\n");
  }
#endif
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg ){
      cacheEntryClear(pParse, p);
      p->iReg = 0;
    }
  }
}

/*
** Record the fact that an affinity change has occurred on iCount
** registers starting with iStart.
................................................................................
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    int r = p->iReg;
    if( r>=iFrom && r<=iTo ) return 1;    /*NO_TEST*/
  }
  return 0;
}
#endif /* SQLITE_DEBUG || SQLITE_COVERAGE_TEST */


/*
** Convert an expression node to a TK_REGISTER
*/
static void exprToRegister(Expr *p, int iReg){
  p->op2 = p->op;
  p->op = TK_REGISTER;
................................................................................
    ** 'BLOB'. */
    pCol->affinity = SQLITE_AFF_BLOB;
    pCol->szEst = 1;
  }else{
    zType = z + sqlite3Strlen30(z) + 1;
    memcpy(zType, pType->z, pType->n);
    zType[pType->n] = 0;

    pCol->affinity = sqlite3AffinityType(zType, &pCol->szEst);
    pCol->colFlags |= COLFLAG_HASTYPE;
  }
  p->nCol++;
  pParse->constraintName.n = 0;
}

................................................................................
  SrcList *pSelectSrc = NULL;  /* SELECT rowid FROM x ... (dup of pSrc) */
  Select *pSelect = NULL;      /* Complete SELECT tree */

  /* Check that there isn't an ORDER BY without a LIMIT clause.
  */
  if( pOrderBy && (pLimit == 0) ) {
    sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on %s", zStmtType);
    goto limit_where_cleanup_2;
  }

  /* We only need to generate a select expression if there
  ** is a limit/offset term to enforce.
  */
  if( pLimit == 0 ) {
    /* if pLimit is null, pOffset will always be null as well. */
................................................................................
  ** becomes:
  **   DELETE FROM table_a WHERE rowid IN ( 
  **     SELECT rowid FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
  **   );
  */

  pSelectRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0, 0);
  if( pSelectRowid == 0 ) goto limit_where_cleanup_2;
  pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid);
  if( pEList == 0 ) goto limit_where_cleanup_2;

  /* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
  ** and the SELECT subtree. */
  pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc, 0);
  if( pSelectSrc == 0 ) {
    sqlite3ExprListDelete(pParse->db, pEList);
    goto limit_where_cleanup_2;
  }

  /* generate the SELECT expression tree. */
  pSelect = sqlite3SelectNew(pParse,pEList,pSelectSrc,pWhere,0,0,
                             pOrderBy,0,pLimit,pOffset);
  if( pSelect == 0 ) return 0;

  /* now generate the new WHERE rowid IN clause for the DELETE/UDPATE */
  pWhereRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0, 0);
  if( pWhereRowid == 0 ) goto limit_where_cleanup_1;
  pInClause = sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0, 0);
  if( pInClause == 0 ) goto limit_where_cleanup_1;

  pInClause->x.pSelect = pSelect;
  pInClause->flags |= EP_xIsSelect;
  sqlite3ExprSetHeightAndFlags(pParse, pInClause);
  return pInClause;

  /* something went wrong. clean up anything allocated. */
limit_where_cleanup_1:
  sqlite3SelectDelete(pParse->db, pSelect);
  return 0;

limit_where_cleanup_2:
  sqlite3ExprDelete(pParse->db, pWhere);
  sqlite3ExprListDelete(pParse->db, pOrderBy);
  sqlite3ExprDelete(pParse->db, pLimit);
  sqlite3ExprDelete(pParse->db, pOffset);
  return 0;
}
#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) */
................................................................................
  int iKey;              /* Memory cell holding key of row to be deleted */
  i16 nKey;              /* Number of memory cells in the row key */
  int iEphCur = 0;       /* Ephemeral table holding all primary key values */
  int iRowSet = 0;       /* Register for rowset of rows to delete */
  int addrBypass = 0;    /* Address of jump over the delete logic */
  int addrLoop = 0;      /* Top of the delete loop */
  int addrEphOpen = 0;   /* Instruction to open the Ephemeral table */


 
#ifndef SQLITE_OMIT_TRIGGER
  int isView;                  /* True if attempting to delete from a view */
  Trigger *pTrigger;           /* List of table triggers, if required */
  int bComplex;                /* True if there are either triggers or FKs */
#endif

  memset(&sContext, 0, sizeof(sContext));
  db = pParse->db;
  if( pParse->nErr || db->mallocFailed ){
    goto delete_from_cleanup;
  }
................................................................................
#ifndef SQLITE_OMIT_TRIGGER
  pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
  isView = pTab->pSelect!=0;
  bComplex = pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0);
#else
# define pTrigger 0
# define isView 0
# define bComplex 0
#endif
#ifdef SQLITE_OMIT_VIEW
# undef isView
# define isView 0
#endif

  /* If pTab is really a view, make sure it has been initialized.
................................................................................
      assert( pIdx->pSchema==pTab->pSchema );
      sqlite3VdbeAddOp2(v, OP_Clear, pIdx->tnum, iDb);
    }
  }else
#endif /* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
  {
    u16 wcf = WHERE_ONEPASS_DESIRED|WHERE_DUPLICATES_OK;

    wcf |= (bComplex ? 0 : WHERE_ONEPASS_MULTIROW);
    if( HasRowid(pTab) ){
      /* For a rowid table, initialize the RowSet to an empty set */
      pPk = 0;
      nPk = 1;
      iRowSet = ++pParse->nMem;
      sqlite3VdbeAddOp2(v, OP_Null, 0, iRowSet);
................................................................................
** A function that loads a shared-library extension then returns NULL.
*/
static void loadExt(sqlite3_context *context, int argc, sqlite3_value **argv){
  const char *zFile = (const char *)sqlite3_value_text(argv[0]);
  const char *zProc;
  sqlite3 *db = sqlite3_context_db_handle(context);
  char *zErrMsg = 0;









  if( argc==2 ){
    zProc = (const char *)sqlite3_value_text(argv[1]);
  }else{
    zProc = 0;
  }
  if( zFile && sqlite3_load_extension(db, zFile, zProc, &zErrMsg) ){
................................................................................


  if( pzErrMsg ) *pzErrMsg = 0;

  /* Ticket #1863.  To avoid a creating security problems for older
  ** applications that relink against newer versions of SQLite, the
  ** ability to run load_extension is turned off by default.  One
  ** must call sqlite3_enable_load_extension() to turn on extension
  ** loading.  Otherwise you get the following error.

  */
  if( (db->flags & SQLITE_LoadExtension)==0 ){
    if( pzErrMsg ){
      *pzErrMsg = sqlite3_mprintf("not authorized");
    }
    return SQLITE_ERROR;
  }
................................................................................
/*
** Enable or disable extension loading.  Extension loading is disabled by
** default so as not to open security holes in older applications.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_enable_load_extension(sqlite3 *db, int onoff){
  sqlite3_mutex_enter(db->mutex);
  if( onoff ){
    db->flags |= SQLITE_LoadExtension;
  }else{
    db->flags &= ~SQLITE_LoadExtension;
  }
  sqlite3_mutex_leave(db->mutex);
  return SQLITE_OK;
}

#endif /* SQLITE_OMIT_LOAD_EXTENSION */

................................................................................
    sqlite3SrcListDelete(db, p->pSrc);
    sqlite3ExprDelete(db, p->pWhere);
    sqlite3ExprListDelete(db, p->pGroupBy);
    sqlite3ExprDelete(db, p->pHaving);
    sqlite3ExprListDelete(db, p->pOrderBy);
    sqlite3ExprDelete(db, p->pLimit);
    sqlite3ExprDelete(db, p->pOffset);
    sqlite3WithDelete(db, p->pWith);
    if( bFree ) sqlite3DbFree(db, p);
    p = pPrior;
    bFree = 1;
  }
}

/*
................................................................................
#endif


/*
** Delete the given Select structure and all of its substructures.
*/
SQLITE_PRIVATE void sqlite3SelectDelete(sqlite3 *db, Select *p){
  clearSelect(db, p, 1);
}

/*
** Return a pointer to the right-most SELECT statement in a compound.
*/
static Select *findRightmost(Select *p){
  while( p->pNext ) p = p->pNext;
................................................................................
  return pTab;
}

/*
** Get a VDBE for the given parser context.  Create a new one if necessary.
** If an error occurs, return NULL and leave a message in pParse.
*/
SQLITE_PRIVATE Vdbe *sqlite3GetVdbe(Parse *pParse){
  Vdbe *v = pParse->pVdbe;
  if( v==0 ){
    v = pParse->pVdbe = sqlite3VdbeCreate(pParse);
    if( v ) sqlite3VdbeAddOp0(v, OP_Init);
    if( pParse->pToplevel==0
     && OptimizationEnabled(pParse->db,SQLITE_FactorOutConst)
    ){
      pParse->okConstFactor = 1;
    }


  }


  return v;
}


/*
** Compute the iLimit and iOffset fields of the SELECT based on the
** pLimit and pOffset expressions.  pLimit and pOffset hold the expressions
** that appear in the original SQL statement after the LIMIT and OFFSET
................................................................................
  sqlite3 *db,          /* The database connection (for malloc()) */
  Select *pSubq,        /* The subquery whose WHERE clause is to be augmented */
  Expr *pWhere,         /* The WHERE clause of the outer query */
  int iCursor           /* Cursor number of the subquery */
){
  Expr *pNew;
  int nChng = 0;

  if( pWhere==0 ) return 0;

  if( (pSubq->selFlags & (SF_Aggregate|SF_Recursive))!=0 ){



     return 0; /* restrictions (1) and (2) */
  }

  if( pSubq->pLimit!=0 ){
     return 0; /* restriction (3) */
  }
  while( pWhere->op==TK_AND ){
    nChng += pushDownWhereTerms(db, pSubq, pWhere->pRight, iCursor);
    pWhere = pWhere->pLeft;
  }
  if( ExprHasProperty(pWhere,EP_FromJoin) ) return 0; /* restriction 5 */
  if( sqlite3ExprIsTableConstant(pWhere, iCursor) ){
................................................................................
  ){
    p->selFlags &= ~SF_Distinct;
    pGroupBy = p->pGroupBy = sqlite3ExprListDup(db, pEList, 0);
    /* Notice that even thought SF_Distinct has been cleared from p->selFlags,
    ** the sDistinct.isTnct is still set.  Hence, isTnct represents the
    ** original setting of the SF_Distinct flag, not the current setting */
    assert( sDistinct.isTnct );







  }

  /* If there is an ORDER BY clause, then create an ephemeral index to
  ** do the sorting.  But this sorting ephemeral index might end up
  ** being unused if the data can be extracted in pre-sorted order.
  ** If that is the case, then the OP_OpenEphemeral instruction will be
  ** changed to an OP_Noop once we figure out that the sorting index is
................................................................................
  int addrBrk;          /* Jump here to break out of the loop */
  int addrNxt;          /* Jump here to start the next IN combination */
  int addrSkip;         /* Jump here for next iteration of skip-scan */
  int addrCont;         /* Jump here to continue with the next loop cycle */
  int addrFirst;        /* First instruction of interior of the loop */
  int addrBody;         /* Beginning of the body of this loop */
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
  int iLikeRepCntr;     /* LIKE range processing counter register */
  int addrLikeRep;      /* LIKE range processing address */
#endif
  u8 iFrom;             /* Which entry in the FROM clause */
  u8 op, p3, p5;        /* Opcode, P3 & P5 of the opcode that ends the loop */
  int p1, p2;           /* Operands of the opcode used to ends the loop */
  union {               /* Information that depends on pWLoop->wsFlags */
    struct {
................................................................................
** An instance of this object holds the complete state of the query
** planner.
*/
struct WhereInfo {
  Parse *pParse;            /* Parsing and code generating context */
  SrcList *pTabList;        /* List of tables in the join */
  ExprList *pOrderBy;       /* The ORDER BY clause or NULL */
  ExprList *pResultSet;     /* Result set. DISTINCT operates on these */
  WhereLoop *pLoops;        /* List of all WhereLoop objects */
  Bitmask revMask;          /* Mask of ORDER BY terms that need reversing */
  LogEst nRowOut;           /* Estimated number of output rows */
  LogEst iLimit;            /* LIMIT if wctrlFlags has WHERE_USE_LIMIT */
  u16 wctrlFlags;           /* Flags originally passed to sqlite3WhereBegin() */
  i8 nOBSat;                /* Number of ORDER BY terms satisfied by indices */
  u8 sorted;                /* True if really sorted (not just grouped) */
................................................................................


/*
** Bitmasks for the operators on WhereTerm objects.  These are all
** operators that are of interest to the query planner.  An
** OR-ed combination of these values can be used when searching for
** particular WhereTerms within a WhereClause.








*/
#define WO_IN     0x0001
#define WO_EQ     0x0002
#define WO_LT     (WO_EQ<<(TK_LT-TK_EQ))
#define WO_LE     (WO_EQ<<(TK_LE-TK_EQ))
#define WO_GT     (WO_EQ<<(TK_GT-TK_EQ))
#define WO_GE     (WO_EQ<<(TK_GE-TK_EQ))
................................................................................
  }
  *pzAff = zAff;
  return regBase;
}

#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
/*
** If the most recently coded instruction is a constant range contraint
** that originated from the LIKE optimization, then change the P3 to be
** pLoop->iLikeRepCntr and set P5.

**
** The LIKE optimization trys to evaluate "x LIKE 'abc%'" as a range
** expression: "x>='ABC' AND x<'abd'".  But this requires that the range
** scan loop run twice, once for strings and a second time for BLOBs.
** The OP_String opcodes on the second pass convert the upper and lower
** bound string contants to blobs.  This routine makes the necessary changes
** to the OP_String opcodes for that to happen.
................................................................................
  if( pTerm->wtFlags & TERM_LIKEOPT ){
    VdbeOp *pOp;
    assert( pLevel->iLikeRepCntr>0 );
    pOp = sqlite3VdbeGetOp(v, -1);
    assert( pOp!=0 );
    assert( pOp->opcode==OP_String8 
            || pTerm->pWC->pWInfo->pParse->db->mallocFailed );
    pOp->p3 = pLevel->iLikeRepCntr;
    pOp->p5 = 1;
  }
}
#else
# define whereLikeOptimizationStringFixup(A,B,C)
#endif

#ifdef SQLITE_ENABLE_CURSOR_HINTS
................................................................................
            sqlite3ExprIfFalse(pParse, pCompare, pLevel->addrCont, 0);
          }
          pCompare->pLeft = 0;
          sqlite3ExprDelete(db, pCompare);
        }
      }
    }





    sqlite3ReleaseTempRange(pParse, iReg, nConstraint+2);

    sqlite3ExprCachePop(pParse);
  }else
#endif /* SQLITE_OMIT_VIRTUALTABLE */

  if( (pLoop->wsFlags & WHERE_IPK)!=0
   && (pLoop->wsFlags & (WHERE_COLUMN_IN|WHERE_COLUMN_EQ))!=0
  ){
................................................................................
    if( pLoop->wsFlags & WHERE_TOP_LIMIT ){
      pRangeEnd = pLoop->aLTerm[j++];
      nExtraReg = 1;
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
      if( (pRangeEnd->wtFlags & TERM_LIKEOPT)!=0 ){
        assert( pRangeStart!=0 );                     /* LIKE opt constraints */
        assert( pRangeStart->wtFlags & TERM_LIKEOPT );   /* occur in pairs */
        pLevel->iLikeRepCntr = ++pParse->nMem;





        testcase( bRev );
        testcase( pIdx->aSortOrder[nEq]==SQLITE_SO_DESC );
        sqlite3VdbeAddOp2(v, OP_Integer,
                          bRev ^ (pIdx->aSortOrder[nEq]==SQLITE_SO_DESC),

                          pLevel->iLikeRepCntr);
        VdbeComment((v, "LIKE loop counter"));
        pLevel->addrLikeRep = sqlite3VdbeCurrentAddr(v);

      }
#endif
      if( pRangeStart==0
       && (j = pIdx->aiColumn[nEq])>=0 
       && pIdx->pTable->aCol[j].notNull==0
      ){
        bSeekPastNull = 1;
................................................................................
    }
    pE = pTerm->pExpr;
    assert( pE!=0 );
    if( pLevel->iLeftJoin && !ExprHasProperty(pE, EP_FromJoin) ){
      continue;
    }
    if( pTerm->wtFlags & TERM_LIKECOND ){





#ifdef SQLITE_LIKE_DOESNT_MATCH_BLOBS
      continue;
#else
      assert( pLevel->iLikeRepCntr>0 );

      skipLikeAddr = sqlite3VdbeAddOp1(v, OP_IfNot, pLevel->iLikeRepCntr);
      VdbeCoverage(v);
#endif
    }
    sqlite3ExprIfFalse(pParse, pE, addrCont, SQLITE_JUMPIFNULL);
    if( skipLikeAddr ) sqlite3VdbeJumpHere(v, skipLikeAddr);
    pTerm->wtFlags |= TERM_CODED;
  }
................................................................................
  Bitmask mask = 0;
  if( p==0 ) return 0;
  if( p->op==TK_COLUMN ){
    mask = sqlite3WhereGetMask(pMaskSet, p->iTable);
    return mask;
  }
  mask = sqlite3WhereExprUsage(pMaskSet, p->pRight);
  mask |= sqlite3WhereExprUsage(pMaskSet, p->pLeft);
  if( ExprHasProperty(p, EP_xIsSelect) ){
    mask |= exprSelectUsage(pMaskSet, p->x.pSelect);
  }else{
    mask |= sqlite3WhereExprListUsage(pMaskSet, p->x.pList);
  }
  return mask;
}
SQLITE_PRIVATE Bitmask sqlite3WhereExprListUsage(WhereMaskSet *pMaskSet, ExprList *pList){
  int i;
  Bitmask mask = 0;
................................................................................

#ifdef WHERETRACE_ENABLED
/*
** Print a WhereLoop object for debugging purposes
*/
static void whereLoopPrint(WhereLoop *p, WhereClause *pWC){
  WhereInfo *pWInfo = pWC->pWInfo;
  int nb = 1+(pWInfo->pTabList->nSrc+7)/8;
  struct SrcList_item *pItem = pWInfo->pTabList->a + p->iTab;
  Table *pTab = pItem->pTab;

  sqlite3DebugPrintf("%c%2d.%0*llx.%0*llx", p->cId,
                     p->iTab, nb, p->maskSelf, nb, p->prereq);
  sqlite3DebugPrintf(" %12s",
                     pItem->zAlias ? pItem->zAlias : pTab->zName);
  if( (p->wsFlags & WHERE_VIRTUALTABLE)==0 ){
    const char *zName;
    if( p->u.btree.pIndex && (zName = p->u.btree.pIndex->zName)!=0 ){
      if( strncmp(zName, "sqlite_autoindex_", 17)==0 ){
        int i = sqlite3Strlen30(zName) - 1;
................................................................................
  }
  if( (pWInfo->wctrlFlags & WHERE_WANT_DISTINCT)!=0
   && (pWInfo->wctrlFlags & WHERE_DISTINCTBY)==0
   && pWInfo->eDistinct==WHERE_DISTINCT_NOOP
   && nRowEst
  ){
    Bitmask notUsed;
    int rc = wherePathSatisfiesOrderBy(pWInfo, pWInfo->pResultSet, pFrom,
                 WHERE_DISTINCTBY, nLoop-1, pFrom->aLoop[nLoop-1], &notUsed);
    if( rc==pWInfo->pResultSet->nExpr ){
      pWInfo->eDistinct = WHERE_DISTINCT_ORDERED;
    }
  }
  if( pWInfo->pOrderBy ){
    if( pWInfo->wctrlFlags & WHERE_DISTINCTBY ){
      if( pFrom->isOrdered==pWInfo->pOrderBy->nExpr ){
        pWInfo->eDistinct = WHERE_DISTINCT_ORDERED;
................................................................................
** to use for OR clause processing.  The WHERE clause should use this
** specific cursor.  If WHERE_ONEPASS_DESIRED is set, then iIdxCur is
** the first cursor in an array of cursors for all indices.  iIdxCur should
** be used to compute the appropriate cursor depending on which index is
** used.
*/
SQLITE_PRIVATE WhereInfo *sqlite3WhereBegin(
  Parse *pParse,        /* The parser context */
  SrcList *pTabList,    /* FROM clause: A list of all tables to be scanned */
  Expr *pWhere,         /* The WHERE clause */
  ExprList *pOrderBy,   /* An ORDER BY (or GROUP BY) clause, or NULL */
  ExprList *pResultSet, /* Result set of the query */
  u16 wctrlFlags,       /* One of the WHERE_* flags defined in sqliteInt.h */
  int iAuxArg           /* If WHERE_ONETABLE_ONLY is set, index cursor number,
                        ** If WHERE_USE_LIMIT, then the limit amount */
){
  int nByteWInfo;            /* Num. bytes allocated for WhereInfo struct */
  int nTabList;              /* Number of elements in pTabList */
  WhereInfo *pWInfo;         /* Will become the return value of this function */
  Vdbe *v = pParse->pVdbe;   /* The virtual database engine */
  Bitmask notReady;          /* Cursors that are not yet positioned */
  WhereLoopBuilder sWLB;     /* The WhereLoop builder */
................................................................................
    goto whereBeginError;
  }
  pWInfo->aiCurOnePass[0] = pWInfo->aiCurOnePass[1] = -1;
  pWInfo->nLevel = nTabList;
  pWInfo->pParse = pParse;
  pWInfo->pTabList = pTabList;
  pWInfo->pOrderBy = pOrderBy;
  pWInfo->pResultSet = pResultSet;
  pWInfo->iBreak = pWInfo->iContinue = sqlite3VdbeMakeLabel(v);
  pWInfo->wctrlFlags = wctrlFlags;
  pWInfo->iLimit = iAuxArg;
  pWInfo->savedNQueryLoop = pParse->nQueryLoop;
  assert( pWInfo->eOnePass==ONEPASS_OFF );  /* ONEPASS defaults to OFF */
  pMaskSet = &pWInfo->sMaskSet;
  sWLB.pWInfo = pWInfo;
................................................................................
#endif

  /* Analyze all of the subexpressions. */
  sqlite3WhereExprAnalyze(pTabList, &pWInfo->sWC);
  if( db->mallocFailed ) goto whereBeginError;

  if( wctrlFlags & WHERE_WANT_DISTINCT ){
    if( isDistinctRedundant(pParse, pTabList, &pWInfo->sWC, pResultSet) ){
      /* The DISTINCT marking is pointless.  Ignore it. */
      pWInfo->eDistinct = WHERE_DISTINCT_UNIQUE;
    }else if( pOrderBy==0 ){
      /* Try to ORDER BY the result set to make distinct processing easier */
      pWInfo->wctrlFlags |= WHERE_DISTINCTBY;
      pWInfo->pOrderBy = pResultSet;
    }
  }

  /* Construct the WhereLoop objects */
#if defined(WHERETRACE_ENABLED)
  if( sqlite3WhereTrace & 0xffff ){
    sqlite3DebugPrintf("*** Optimizer Start *** (wctrlFlags: 0x%x",wctrlFlags);
................................................................................
    for(ii=0; ii<pWInfo->nLevel; ii++){
      whereLoopPrint(pWInfo->a[ii].pWLoop, sWLB.pWC);
    }
  }
#endif
  /* Attempt to omit tables from the join that do not effect the result */
  if( pWInfo->nLevel>=2
   && pResultSet!=0
   && OptimizationEnabled(db, SQLITE_OmitNoopJoin)
  ){
    Bitmask tabUsed = sqlite3WhereExprListUsage(pMaskSet, pResultSet);
    if( sWLB.pOrderBy ){
      tabUsed |= sqlite3WhereExprListUsage(pMaskSet, sWLB.pOrderBy);
    }
    while( pWInfo->nLevel>=2 ){
      WhereTerm *pTerm, *pEnd;
      pLoop = pWInfo->a[pWInfo->nLevel-1].pWLoop;
      if( (pWInfo->pTabList->a[pLoop->iTab].fg.jointype & JT_LEFT)==0 ) break;
................................................................................
      sqlite3VdbeGoto(v, pLevel->addrSkip);
      VdbeComment((v, "next skip-scan on %s", pLoop->u.btree.pIndex->zName));
      sqlite3VdbeJumpHere(v, pLevel->addrSkip);
      sqlite3VdbeJumpHere(v, pLevel->addrSkip-2);
    }
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
    if( pLevel->addrLikeRep ){
      int op;
      if( sqlite3VdbeGetOp(v, pLevel->addrLikeRep-1)->p1 ){
        op = OP_DecrJumpZero;
      }else{
        op = OP_JumpZeroIncr;
      }
      sqlite3VdbeAddOp2(v, op, pLevel->iLikeRepCntr, pLevel->addrLikeRep);
      VdbeCoverage(v);
    }
#endif
    if( pLevel->iLeftJoin ){
      addr = sqlite3VdbeAddOp1(v, OP_IfPos, pLevel->iLeftJoin); VdbeCoverage(v);
      assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0
           || (pLoop->wsFlags & WHERE_INDEXED)!=0 );
................................................................................
#ifndef INTERFACE
# define INTERFACE 1
#endif
/************* Begin control #defines *****************************************/
#define YYCODETYPE unsigned char
#define YYNOCODE 251
#define YYACTIONTYPE unsigned short int
#define YYWILDCARD 70
#define sqlite3ParserTOKENTYPE Token
typedef union {
  int yyinit;
  sqlite3ParserTOKENTYPE yy0;
  struct LimitVal yy64;
  Expr* yy122;
  Select* yy159;
................................................................................
**  yy_shift_ofst[]    For each state, the offset into yy_action for
**                     shifting terminals.
**  yy_reduce_ofst[]   For each state, the offset into yy_action for
**                     shifting non-terminals after a reduce.
**  yy_default[]       Default action for each state.
**
*********** Begin parsing tables **********************************************/
#define YY_ACTTAB_COUNT (1499)
static const YYACTIONTYPE yy_action[] = {
 /*     0 */   315, 1302,  146,  921,    2,  194,  922,  342,  952,   91,
 /*    10 */    91,   91,   91,   84,   89,   89,   89,   89,   88,   88,
 /*    20 */    87,   87,   87,   86,  339,   87,   87,   87,   86,  339,
 /*    30 */   331,  819,  819,   91,   91,   91,   91,  339,   89,   89,
 /*    40 */    89,   89,   88,   88,   87,   87,   87,   86,  339,  319,
 /*    50 */   933,  933,   92,   93,   83,  831,  834,  823,  823,   90,
 /*    60 */    90,   91,   91,   91,   91,  123,   89,   89,   89,   89,
 /*    70 */    88,   88,   87,   87,   87,   86,  339,  315,  952,   89,
 /*    80 */    89,   89,   89,   88,   88,   87,   87,   87,   86,  339,
 /*    90 */   365,  772,  360,   24,  933,  933,  947,  694,  933,  933,
 /*   100 */   773,  937,  933,  933,  434,  715,  328,  434,  819,  819,
 /*   110 */   203,  160,  278,  391,  273,  390,  190,  933,  933,  370,
 /*   120 */   934,  935,  367,  271,  953,   48,  679,  953,   48,   92,
 /*   130 */    93,   83,  831,  834,  823,  823,   90,   90,   91,   91,
 /*   140 */    91,   91,  123,   89,   89,   89,   89,   88,   88,   87,
 /*   150 */    87,   87,   86,  339,  315,  682,  337,  336,  218,  412,
 /*   160 */   398,   68,  412,  403,  934,  935,  743,  959,  934,  935,
 /*   170 */   810,  937,  934,  935,  957,  221,  958,   88,   88,   87,
 /*   180 */    87,   87,   86,  339,  291,  819,  819,  934,  935,  185,
 /*   190 */    94,  792,  388,  385,  384, 1240, 1240,  792,  804,  960,
 /*   200 */   960,  290,  798,  383,  123,  315,   92,   93,   83,  831,
 /*   210 */   834,  823,  823,   90,   90,   91,   91,   91,   91,  326,
 /*   220 */    89,   89,   89,   89,   88,   88,   87,   87,   87,   86,
 /*   230 */   339,  681,  741,  803,  803,  803,  819,  819,  944,   56,
 /*   240 */   253,  353,  242,   85,   82,  168,  253,  358,  252,  110,
 /*   250 */    96,  233,  397,  698,  677,  683,  683,   92,   93,   83,
 /*   260 */   831,  834,  823,  823,   90,   90,   91,   91,   91,   91,
 /*   270 */   433,   89,   89,   89,   89,   88,   88,   87,   87,   87,
 /*   280 */    86,  339,  315,  434,  439,  651,  396,   57,  733,  733,
 /*   290 */   234,  291,  107,  287,  395,   86,  339,  810,  427,  728,
 /*   300 */   933,  933,  185,  953,   30,  388,  385,  384,  215,  949,
 /*   310 */   434,  933,  933,  819,  819,  697,  383,  162,  161,  407,
 /*   320 */   400,   85,   82,  168,  677,  804,  335,  113,  771,  798,
 /*   330 */   953,   48,   22,  351,   92,   93,   83,  831,  834,  823,
 /*   340 */   823,   90,   90,   91,   91,   91,   91,  870,   89,   89,
 /*   350 */    89,   89,   88,   88,   87,   87,   87,   86,  339,  315,
 /*   360 */   803,  803,  803,  268,  123,  412,  394,    1,  933,  933,
 /*   370 */   934,  935,  933,  933,   85,   82,  168,  232,    5,  343,
 /*   380 */   194,  934,  935,  952,   85,   82,  168,   54,  956,  434,
 /*   390 */   819,  819,  431,  938,  939,  792,   67,  759,  350,  144,
 /*   400 */   166,  770,  123,  896,  889,  955,  348,  288,  758,  953,
 /*   410 */    47,   92,   93,   83,  831,  834,  823,  823,   90,   90,
 /*   420 */    91,   91,   91,   91,  892,   89,   89,   89,   89,   88,
 /*   430 */    88,   87,   87,   87,   86,  339,  315,  113,  934,  935,
 /*   440 */   687,  893,  934,  935,  253,  358,  252,   85,   82,  168,
 /*   450 */   820,  820,  956,  952,  338,  938,  939,  894,  701,  721,
 /*   460 */   359,  289,  233,  397,  434,  349,  434,  819,  819,  955,
 /*   470 */   866,  722,   23,  389,  832,  835,  692,  357,  904,  667,
 /*   480 */   194,  702,  402,  952,  953,   48,  953,   48,   92,   93,
 /*   490 */    83,  831,  834,  823,  823,   90,   90,   91,   91,   91,
 /*   500 */    91,  824,   89,   89,   89,   89,   88,   88,   87,   87,
 /*   510 */    87,   86,  339,  315,  434,  113,  434,  680,  434,  332,
 /*   520 */   434,  408,  889,  356,  380,  940,  401,  720,  948,  864,
 /*   530 */   191,  165,  329,  689,  953,    9,  953,    9,  953,    9,
 /*   540 */   953,    9,  718,  948,  819,  819,  953,    8,  325,  111,
 /*   550 */   327,  153,  224,  952,  410,  113,  189,  337,  336,  913,
 /*   560 */  1295,  852,   75, 1295,   73,   92,   93,   83,  831,  834,
 /*   570 */   823,  823,   90,   90,   91,   91,   91,   91,  359,   89,
 /*   580 */    89,   89,   89,   88,   88,   87,   87,   87,   86,  339,
 /*   590 */   315,  730,  148,  236,  797,  366,  789,  892, 1179,  434,
 /*   600 */   960,  960,  400,  148,  314,  212,  873,  911,  757,  404,
 /*   610 */   872,  300,  320,  434,  893,  311,  237,  271,  405,  953,
 /*   620 */    34,  819,  819,  225,  371,  945,  360,  913, 1296,  113,
 /*   630 */   894, 1296,  417,  953,   35, 1245,  922,  342,  259,  247,
 /*   640 */   290,  315,   92,   93,   83,  831,  834,  823,  823,   90,
 /*   650 */    90,   91,   91,   91,   91,  148,   89,   89,   89,   89,
 /*   660 */    88,   88,   87,   87,   87,   86,  339,  310,  434,  796,
 /*   670 */   434,  240,  819,  819,  266,  911,  876,  876,  373,  346,
 /*   680 */   167,  654,  655,  656,  259,  244,   19,  246,  953,   11,
 /*   690 */   953,   26,  222,   92,   93,   83,  831,  834,  823,  823,
 /*   700 */    90,   90,   91,   91,   91,   91,  757,   89,   89,   89,
 /*   710 */    89,   88,   88,   87,   87,   87,   86,  339,  315,  434,
 /*   720 */   261,  434,  264,  696,  434,  241,  434,  344,  971,  308,
 /*   730 */   757,  434,  796,  434,  324,  434,  393,  423,  434,  953,
 /*   740 */    36,  953,   37,   20,  953,   38,  953,   27,  434,  819,
 /*   750 */   819,  953,   28,  953,   39,  953,   40,  738,  953,   41,
 /*   760 */    71,  738,  737,  245,  307,  973,  737,  259,  953,   10,
 /*   770 */    92,   93,   83,  831,  834,  823,  823,   90,   90,   91,
 /*   780 */    91,   91,   91,  434,   89,   89,   89,   89,   88,   88,
 /*   790 */    87,   87,   87,   86,  339,  315,  434,  372,  434,  259,
 /*   800 */   149,  434,  167,  953,   42,  188,  187,  186,  219,  434,
 /*   810 */   748,  434,  974,  434,  796,  434,  953,   98,  953,   43,
 /*   820 */   862,  953,   44,  434,  920,    2,  819,  819,  757,  953,
 /*   830 */    31,  953,   45,  953,   46,  953,   32,   74,  307,  912,
 /*   840 */   220,  259,  259,  953,  115,  909,  315,   92,   93,   83,
 /*   850 */   831,  834,  823,  823,   90,   90,   91,   91,   91,   91,
 /*   860 */   434,   89,   89,   89,   89,   88,   88,   87,   87,   87,
 /*   870 */    86,  339,  434,  248,  434,  215,  949,  819,  819,  333,
 /*   880 */   953,  116,  895,  860,  176,  259,  974,  400,  361,  259,
 /*   890 */   951,  887,  953,  117,  953,   52,  884,  315,   92,   93,
 /*   900 */    83,  831,  834,  823,  823,   90,   90,   91,   91,   91,
 /*   910 */    91,  434,   89,   89,   89,   89,   88,   88,   87,   87,
 /*   920 */    87,   86,  339,  434,  113,  434,  258,  883,  819,  819,
 /*   930 */   727,  953,   33,  363,  259,  673,  321,  189,  430,  321,
 /*   940 */   368,  365,  364,  953,   99,  953,   49,  365,  315,   92,
 /*   950 */    81,   83,  831,  834,  823,  823,   90,   90,   91,   91,
 /*   960 */    91,   91,  434,   89,   89,   89,   89,   88,   88,   87,
 /*   970 */    87,   87,   86,  339,  434,  723,  434,  214,  165,  819,
 /*   980 */   819,  772,  953,  100,  322,  124, 1269,  158,   65,  710,
 /*   990 */   773,  700,  699,  320,  953,  101,  953,   97,  255,  315,
 /*  1000 */   216,   93,   83,  831,  834,  823,  823,   90,   90,   91,
 /*  1010 */    91,   91,   91,  434,   89,   89,   89,   89,   88,   88,
 /*  1020 */    87,   87,   87,   86,  339,  434,  251,  434,  707,  708,
 /*  1030 */   819,  819,  223,  953,  114,  908,  794,  254,  309,  193,
 /*  1040 */    67,  381,  869,  869,  199,  953,  112,  953,  105,  269,
 /*  1050 */   726,  260,   67,   83,  831,  834,  823,  823,   90,   90,
 /*  1060 */    91,   91,   91,   91,  263,   89,   89,   89,   89,   88,
 /*  1070 */    88,   87,   87,   87,   86,  339,   79,  429,  690,    3,
 /*  1080 */  1174,  228,  434,  113,  340,  340,  868,  868,  265,   79,
 /*  1090 */   429,  735,    3,  859,   70,  432,  434,  340,  340,  434,
 /*  1100 */  1259,  434,  953,  104,  434,  670,  416,  766,  432,  434,
 /*  1110 */   193,  434,  413,  434,  418,  806,  953,  102,  420,  953,
 /*  1120 */   103,  953,   48,  123,  953,   51,  810,  418,  424,  953,
 /*  1130 */    53,  953,   50,  953,   25,  267,  123,  711,  113,  810,
 /*  1140 */   428,  277,  695,  272,  764,  113,   76,   77,  690,  434,
 /*  1150 */   795,  113,  276,   78,  436,  435,  412,  414,  798,   76,
 /*  1160 */    77,  113,  855,  859,  376,  199,   78,  436,  435,  953,
 /*  1170 */    29,  798,  744,  113,  755,   79,  429,  675,    3,  415,
 /*  1180 */   109,  292,  293,  340,  340,  806,  802,  678,  672,  803,
 /*  1190 */   803,  803,  805,   18,  432,  661,  660,  662,  927,  209,
 /*  1200 */   150,  352,  803,  803,  803,  805,   18,    6,  306,  280,
 /*  1210 */   282,  284,  786,  418,  250,  386,  243,  886,  694,  362,
 /*  1220 */   286,  163,  275,   79,  429,  810,    3,  857,  856,  159,
 /*  1230 */   419,  340,  340,  298,  930,  968,  126,  196,  965,  903,
 /*  1240 */   901,  323,  432,  136,   55,   76,   77,  742,  147,   58,
 /*  1250 */   121,  129,   78,  436,  435,   65,  783,  798,  354,  131,
 /*  1260 */   355,  418,  379,  132,  133,  134,  175,  139,  151,  369,
 /*  1270 */   888,  180,  791,  810,   61,  851,  871,   69,  429,  375,
 /*  1280 */     3,  756,  210,  257,  181,  340,  340,  145,  803,  803,
 /*  1290 */   803,  805,   18,   76,   77,  377,  432,  262,  182,  183,
 /*  1300 */    78,  436,  435,  663,  312,  798,  392,  714,  713,  712,
 /*  1310 */   330,  705,  692,  313,  704,  418,  686,  406,  752,  685,
 /*  1320 */   274,  684,  942,   64,  279,  195,  281,  810,  753,  839,
 /*  1330 */   751,  283,   72,  750,  285,  422,  803,  803,  803,  805,
 /*  1340 */    18,  334,  426,   95,  411,  229,  409,   76,   77,  230,
 /*  1350 */   734,   66,  231,  294,   78,  436,  435,  204,  295,  798,
 /*  1360 */   217,  296,  297,  669,   21,  305,  304,  303,  206,  301,
 /*  1370 */   437,  928,  664,  205,  208,  207,  438,  658,  657,  652,
 /*  1380 */   118,  108,  119,  226,  650,  341,  157,  170,  169,  239,
 /*  1390 */   803,  803,  803,  805,   18,  125,  120,  235,  238,  317,
 /*  1400 */   318,  345,  106,  790,  867,  127,  865,  128,  130,  724,
 /*  1410 */   249,  172,  174,  882,  135,  137,   59,  138,  173,   60,
 /*  1420 */   885,  123,  171,  177,  178,  881,    7,   12,  179,  256,
 /*  1430 */   874,  140,  193,  962,  374,  141,  666,  152,  378,  276,
 /*  1440 */   184,  382,  142,  122,   62,   13,  387,  703,  270,   14,
 /*  1450 */    63,  227,  809,  808,  837,  732,   15,  841,  736,    4,
 /*  1460 */   765,  211,  399,  164,  213,  143,  760,  201,   70,  316,
 /*  1470 */    67,  838,  836,  891,  198,  192,   16,  197,  890,  917,
 /*  1480 */   154,   17,  202,  421,  918,  155,  200,  156,  425,  840,
 /*  1490 */   807, 1261,  676,   80,  302,  299,  347, 1260,  923,
};
static const YYCODETYPE yy_lookahead[] = {
 /*     0 */    19,  144,  145,  146,  147,   24,    1,    2,   27,   80,
 /*    10 */    81,   82,   83,   84,   85,   86,   87,   88,   89,   90,
 /*    20 */    91,   92,   93,   94,   95,   91,   92,   93,   94,   95,
 /*    30 */    19,   50,   51,   80,   81,   82,   83,   95,   85,   86,
 /*    40 */    87,   88,   89,   90,   91,   92,   93,   94,   95,  157,
 /*    50 */    27,   28,   71,   72,   73,   74,   75,   76,   77,   78,
 /*    60 */    79,   80,   81,   82,   83,   66,   85,   86,   87,   88,
 /*    70 */    89,   90,   91,   92,   93,   94,   95,   19,   97,   85,
 /*    80 */    86,   87,   88,   89,   90,   91,   92,   93,   94,   95,
 /*    90 */   152,   33,  152,   22,   27,   28,  179,  180,   27,   28,
 /*   100 */    42,   27,   27,   28,  152,  188,   95,  152,   50,   51,
 /*   110 */    99,  100,  101,  102,  103,  104,  105,   27,   28,  227,
 /*   120 */    97,   98,  230,  112,  172,  173,  172,  172,  173,   71,
 /*   130 */    72,   73,   74,   75,   76,   77,   78,   79,   80,   81,
 /*   140 */    82,   83,   66,   85,   86,   87,   88,   89,   90,   91,
 /*   150 */    92,   93,   94,   95,   19,  172,   89,   90,  218,  207,
 /*   160 */   208,   26,  207,  208,   97,   98,   91,  100,   97,   98,
 /*   170 */    69,   97,   97,   98,  107,  237,  109,   89,   90,   91,
 /*   180 */    92,   93,   94,   95,  152,   50,   51,   97,   98,   99,
 /*   190 */    55,   59,  102,  103,  104,  119,  120,   59,   97,  132,
 /*   200 */   133,  152,  101,  113,   66,   19,   71,   72,   73,   74,
 /*   210 */    75,   76,   77,   78,   79,   80,   81,   82,   83,  187,
 /*   220 */    85,   86,   87,   88,   89,   90,   91,   92,   93,   94,
 /*   230 */    95,  172,  210,  132,  133,  134,   50,   51,  185,   53,
 /*   240 */   108,  109,  110,  221,  222,  223,  108,  109,  110,   22,
 /*   250 */    22,  119,  120,  181,   27,   27,   28,   71,   72,   73,
 /*   260 */    74,   75,   76,   77,   78,   79,   80,   81,   82,   83,
 /*   270 */   152,   85,   86,   87,   88,   89,   90,   91,   92,   93,
 /*   280 */    94,   95,   19,  152,  148,  149,  115,   24,  117,  118,
 /*   290 */   154,  152,  156,  152,  163,   94,   95,   69,  249,  163,
 /*   300 */    27,   28,   99,  172,  173,  102,  103,  104,  194,  195,
 /*   310 */   152,   27,   28,   50,   51,  181,  113,   89,   90,  152,
 /*   320 */   206,  221,  222,  223,   97,   97,  187,  196,  175,  101,
 /*   330 */   172,  173,  196,  219,   71,   72,   73,   74,   75,   76,
 /*   340 */    77,   78,   79,   80,   81,   82,   83,   11,   85,   86,
 /*   350 */    87,   88,   89,   90,   91,   92,   93,   94,   95,   19,
 /*   360 */   132,  133,  134,   23,   66,  207,  208,   22,   27,   28,
 /*   370 */    97,   98,   27,   28,  221,  222,  223,  199,   22,  243,
 /*   380 */    24,   97,   98,   27,  221,  222,  223,  209,  152,  152,
 /*   390 */    50,   51,  168,  169,  170,   59,   26,  124,  100,   58,
 /*   400 */   152,  175,   66,  240,  163,  169,  170,  152,  124,  172,
 /*   410 */   173,   71,   72,   73,   74,   75,   76,   77,   78,   79,
 /*   420 */    80,   81,   82,   83,   12,   85,   86,   87,   88,   89,
 /*   430 */    90,   91,   92,   93,   94,   95,   19,  196,   97,   98,
 /*   440 */    23,   29,   97,   98,  108,  109,  110,  221,  222,  223,
 /*   450 */    50,   51,  152,   97,  168,  169,  170,   45,   37,   47,
 /*   460 */   219,  224,  119,  120,  152,  229,  152,   50,   51,  169,
 /*   470 */   170,   59,  231,   52,   74,   75,  106,  236,  152,   21,
 /*   480 */    24,   60,  163,   27,  172,  173,  172,  173,   71,   72,
 /*   490 */    73,   74,   75,   76,   77,   78,   79,   80,   81,   82,
 /*   500 */    83,  101,   85,   86,   87,   88,   89,   90,   91,   92,
 /*   510 */    93,   94,   95,   19,  152,  196,  152,   23,  152,  207,
 /*   520 */   152,  207,  163,   65,   19,  171,  152,  190,  191,  229,
 /*   530 */   211,  212,  111,  179,  172,  173,  172,  173,  172,  173,
 /*   540 */   172,  173,  190,  191,   50,   51,  172,  173,  186,   22,
 /*   550 */   186,   24,  186,   97,  186,  196,   51,   89,   90,   22,
 /*   560 */    23,  103,  137,   26,  139,   71,   72,   73,   74,   75,
 /*   570 */    76,   77,   78,   79,   80,   81,   82,   83,  219,   85,
 /*   580 */    86,   87,   88,   89,   90,   91,   92,   93,   94,   95,
 /*   590 */    19,  195,  152,  152,   23,  236,  163,   12,  140,  152,
 /*   600 */   132,  133,  206,  152,  164,   23,   31,   70,   26,   19,
 /*   610 */    35,  160,  107,  152,   29,  164,  152,  112,   28,  172,
 /*   620 */   173,   50,   51,  183,   49,  185,  152,   22,   23,  196,
 /*   630 */    45,   26,   47,  172,  173,    0,    1,    2,  152,   16,
 /*   640 */   152,   19,   71,   72,   73,   74,   75,   76,   77,   78,
 /*   650 */    79,   80,   81,   82,   83,  152,   85,   86,   87,   88,
 /*   660 */    89,   90,   91,   92,   93,   94,   95,  164,  152,  152,
 /*   670 */   152,  152,   50,   51,   16,   70,  108,  109,  110,  193,
 /*   680 */    98,    7,    8,    9,  152,   62,   22,   64,  172,  173,
 /*   690 */   172,  173,  218,   71,   72,   73,   74,   75,   76,   77,
 /*   700 */    78,   79,   80,   81,   82,   83,  124,   85,   86,   87,
 /*   710 */    88,   89,   90,   91,   92,   93,   94,   95,   19,  152,
 /*   720 */    62,  152,   64,  181,  152,  193,  152,  241,  246,  247,
 /*   730 */    26,  152,  152,  152,  217,  152,   91,  249,  152,  172,
 /*   740 */   173,  172,  173,   79,  172,  173,  172,  173,  152,   50,
 /*   750 */    51,  172,  173,  172,  173,  172,  173,  116,  172,  173,
 /*   760 */   138,  116,  121,  140,   22,   23,  121,  152,  172,  173,
 /*   770 */    71,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*   780 */    81,   82,   83,  152,   85,   86,   87,   88,   89,   90,
 /*   790 */    91,   92,   93,   94,   95,   19,  152,  217,  152,  152,
 /*   800 */    24,  152,   98,  172,  173,  108,  109,  110,  193,  152,
 /*   810 */   213,  152,   70,  152,  152,  152,  172,  173,  172,  173,
 /*   820 */   152,  172,  173,  152,  146,  147,   50,   51,  124,  172,
 /*   830 */   173,  172,  173,  172,  173,  172,  173,  138,   22,   23,
 /*   840 */   193,  152,  152,  172,  173,  152,   19,   71,   72,   73,
 /*   850 */    74,   75,   76,   77,   78,   79,   80,   81,   82,   83,
 /*   860 */   152,   85,   86,   87,   88,   89,   90,   91,   92,   93,
 /*   870 */    94,   95,  152,  152,  152,  194,  195,   50,   51,  217,
 /*   880 */   172,  173,  193,  193,   26,  152,   70,  206,  152,  152,
 /*   890 */    26,  163,  172,  173,  172,  173,  152,   19,   71,   72,
 /*   900 */    73,   74,   75,   76,   77,   78,   79,   80,   81,   82,
 /*   910 */    83,  152,   85,   86,   87,   88,   89,   90,   91,   92,
 /*   920 */    93,   94,   95,  152,  196,  152,  193,  152,   50,   51,
 /*   930 */   193,  172,  173,   19,  152,  166,  167,   51,  166,  167,
 /*   940 */   152,  152,   28,  172,  173,  172,  173,  152,   19,   71,
 /*   950 */    72,   73,   74,   75,   76,   77,   78,   79,   80,   81,
 /*   960 */    82,   83,  152,   85,   86,   87,   88,   89,   90,   91,
 /*   970 */    92,   93,   94,   95,  152,  193,  152,  211,  212,   50,
 /*   980 */    51,   33,  172,  173,  244,  245,   23,  123,  130,   26,
 /*   990 */    42,  100,  101,  107,  172,  173,  172,  173,  152,   19,
 /*  1000 */    22,   72,   73,   74,   75,   76,   77,   78,   79,   80,
 /*  1010 */    81,   82,   83,  152,   85,   86,   87,   88,   89,   90,
 /*  1020 */    91,   92,   93,   94,   95,  152,  237,  152,    7,    8,
 /*  1030 */    50,   51,  237,  172,  173,   23,   23,   23,   26,   26,
 /*  1040 */    26,   23,  132,  133,   26,  172,  173,  172,  173,   23,
 /*  1050 */   163,  152,   26,   73,   74,   75,   76,   77,   78,   79,
 /*  1060 */    80,   81,   82,   83,  152,   85,   86,   87,   88,   89,
 /*  1070 */    90,   91,   92,   93,   94,   95,   19,   20,   27,   22,
 /*  1080 */    23,  210,  152,  196,   27,   28,  132,  133,  152,   19,
 /*  1090 */    20,   23,   22,   27,   26,   38,  152,   27,   28,  152,
 /*  1100 */   122,  152,  172,  173,  152,  163,  191,   23,   38,  152,
 /*  1110 */    26,  152,  163,  152,   57,   27,  172,  173,  163,  172,
 /*  1120 */   173,  172,  173,   66,  172,  173,   69,   57,  163,  172,
 /*  1130 */   173,  172,  173,  172,  173,  152,   66,  152,  196,   69,
 /*  1140 */   163,  101,  152,  152,  152,  196,   89,   90,   97,  152,
 /*  1150 */   152,  196,  112,   96,   97,   98,  207,  208,  101,   89,
 /*  1160 */    90,  196,   23,   97,  233,   26,   96,   97,   98,  172,
 /*  1170 */   173,  101,  152,  196,  152,   19,   20,   23,   22,  152,
 /*  1180 */    26,  152,  152,   27,   28,   97,  152,  152,  152,  132,
 /*  1190 */   133,  134,  135,  136,   38,  152,  152,  152,  152,  232,
 /*  1200 */   197,  214,  132,  133,  134,  135,  136,  198,  150,  210,
 /*  1210 */   210,  210,  201,   57,  238,  176,  214,  201,  180,  238,
 /*  1220 */   214,  184,  175,   19,   20,   69,   22,  175,  175,  198,
 /*  1230 */   226,   27,   28,  200,  155,   39,  242,  122,   41,  159,
 /*  1240 */   159,  159,   38,   22,  239,   89,   90,   91,  220,  239,
 /*  1250 */    71,  189,   96,   97,   98,  130,  201,  101,   18,  192,
 /*  1260 */   159,   57,   18,  192,  192,  192,  158,  189,  220,  159,
 /*  1270 */   201,  158,  189,   69,  137,  201,  235,   19,   20,   46,
 /*  1280 */    22,  159,  159,  234,  158,   27,   28,   22,  132,  133,
 /*  1290 */   134,  135,  136,   89,   90,  177,   38,  159,  158,  158,
 /*  1300 */    96,   97,   98,  159,  177,  101,  107,  174,  174,  174,
 /*  1310 */    48,  182,  106,  177,  182,   57,  174,  125,  216,  176,
 /*  1320 */   174,  174,  174,  107,  215,  159,  215,   69,  216,  159,
 /*  1330 */   216,  215,  137,  216,  215,  177,  132,  133,  134,  135,
 /*  1340 */   136,   95,  177,  129,  126,  225,  127,   89,   90,  228,
 /*  1350 */   205,  128,  228,  204,   96,   97,   98,   25,  203,  101,
 /*  1360 */     5,  202,  201,  162,   26,   10,   11,   12,   13,   14,
 /*  1370 */   161,   13,   17,  153,    6,  153,  151,  151,  151,  151,
 /*  1380 */   165,  178,  165,  178,    4,    3,   22,   32,   15,   34,
 /*  1390 */   132,  133,  134,  135,  136,  245,  165,  142,   43,  248,
 /*  1400 */   248,   68,   16,  120,   23,  131,   23,  111,  123,   20,
 /*  1410 */    16,   56,  125,    1,  123,  131,   79,  111,   63,   79,
 /*  1420 */    28,   66,   67,   36,  122,    1,    5,   22,  107,  140,
 /*  1430 */    54,   54,   26,   61,   44,  107,   20,   24,   19,  112,
 /*  1440 */   105,   53,   22,   40,   22,   22,   53,   30,   23,   22,
 /*  1450 */    22,   53,   23,   23,   23,  116,   22,   11,   23,   22,
 /*  1460 */    28,   23,   26,  122,   23,   22,  124,  122,   26,  114,
 /*  1470 */    26,   23,   23,   23,   22,   36,   36,   26,   23,   23,
 /*  1480 */    22,   36,  122,   24,   23,   22,   26,   22,   24,   23,
 /*  1490 */    23,  122,   23,   22,   15,   23,  141,  122,    1,
};
#define YY_SHIFT_USE_DFLT (-72)
#define YY_SHIFT_COUNT (439)
#define YY_SHIFT_MIN   (-71)
#define YY_SHIFT_MAX   (1497)
static const short yy_shift_ofst[] = {
 /*     0 */     5, 1057, 1355, 1070, 1204, 1204, 1204,  138,  -19,   58,
 /*    10 */    58,  186, 1204, 1204, 1204, 1204, 1204, 1204, 1204,   67,
 /*    20 */    67,   90,  132,  336,   76,  135,  263,  340,  417,  494,
 /*    30 */   571,  622,  699,  776,  827,  827,  827,  827,  827,  827,
 /*    40 */   827,  827,  827,  827,  827,  827,  827,  827,  827,  878,
 /*    50 */   827,  929,  980,  980, 1156, 1204, 1204, 1204, 1204, 1204,
 /*    60 */  1204, 1204, 1204, 1204, 1204, 1204, 1204, 1204, 1204, 1204,
 /*    70 */  1204, 1204, 1204, 1204, 1204, 1204, 1204, 1204, 1204, 1204,
 /*    80 */  1204, 1204, 1204, 1258, 1204, 1204, 1204, 1204, 1204, 1204,
 /*    90 */  1204, 1204, 1204, 1204, 1204, 1204, 1204,  -71,  -47,  -47,
 /*   100 */   -47,  -47,  -47,   -6,   88,  -66,   23,  458,  505,  468,
 /*   110 */   468,   23,  201,  343,  -58,  -72,  -72,  -72,   11,   11,
 /*   120 */    11,  412,  412,  341,  537,  605,   23,   23,   23,   23,
 /*   130 */    23,   23,   23,   23,   23,   23,   23,   23,   23,   23,
 /*   140 */    23,   23,   23,   23,   23,   23,  635,  298,   74,   74,
 /*   150 */   343,   -1,   -1,   -1,   -1,   -1,   -1,  -72,  -72,  -72,
 /*   160 */   228,  101,  101,  203,   75,   71,  273,  284,  345,   23,
 /*   170 */    23,   23,   23,   23,   23,   23,   23,   23,   23,   23,
 /*   180 */    23,   23,   23,   23,   23,   23,  421,  421,  421,   23,
 /*   190 */    23,  582,   23,   23,   23,  356,   23,   23,  585,   23,
 /*   200 */    23,   23,   23,   23,   23,   23,   23,   23,   23,  568,
 /*   210 */   575,  456,  456,  456,  704,  171,  645,  674,  858,  590,
 /*   220 */   590,  914,  858,  914,  370,  963,  886,  948,  590,  425,
 /*   230 */   948,  948,  864,  641,  527, 1196, 1115, 1115, 1197, 1197,
 /*   240 */  1115, 1221, 1179, 1125, 1240, 1240, 1240, 1240, 1115, 1244,
 /*   250 */  1125, 1221, 1179, 1179, 1125, 1115, 1244, 1137, 1233, 1115,
 /*   260 */  1115, 1244, 1265, 1115, 1244, 1115, 1244, 1265, 1199, 1199,
 /*   270 */  1199, 1262, 1265, 1199, 1206, 1199, 1262, 1199, 1199, 1192,
 /*   280 */  1216, 1192, 1216, 1192, 1216, 1192, 1216, 1115, 1115, 1195,
 /*   290 */  1265, 1246, 1246, 1265, 1214, 1218, 1223, 1219, 1125, 1332,
 /*   300 */  1338, 1358, 1358, 1368, 1368, 1368, 1368,  -72,  -72,  -72,
 /*   310 */   -72,  -72,  -72,  -72,  -72,  400,  623,  742,  816,  658,
 /*   320 */   697,  227, 1012,  664, 1013, 1014, 1018, 1026, 1051,  891,
 /*   330 */  1021, 1040, 1068, 1084, 1066, 1139,  910,  954, 1154, 1088,
 /*   340 */   978, 1380, 1382, 1364, 1255, 1373, 1333, 1386, 1381, 1383,
 /*   350 */  1283, 1274, 1296, 1285, 1389, 1287, 1394, 1412, 1291, 1284,
 /*   360 */  1337, 1340, 1306, 1392, 1387, 1302, 1424, 1421, 1405, 1321,
 /*   370 */  1289, 1376, 1406, 1377, 1372, 1390, 1328, 1413, 1416, 1419,
 /*   380 */  1327, 1335, 1420, 1388, 1422, 1423, 1425, 1427, 1393, 1417,
 /*   390 */  1428, 1398, 1403, 1429, 1430, 1431, 1339, 1434, 1435, 1437,
 /*   400 */  1436, 1341, 1438, 1441, 1432, 1439, 1443, 1342, 1442, 1440,
 /*   410 */  1444, 1445, 1442, 1448, 1449, 1450, 1451, 1455, 1452, 1446,
 /*   420 */  1456, 1458, 1459, 1460, 1461, 1463, 1464, 1460, 1466, 1465,
 /*   430 */  1467, 1469, 1471, 1345, 1360, 1369, 1375, 1472, 1479, 1497,
};
#define YY_REDUCE_USE_DFLT (-144)
#define YY_REDUCE_COUNT (314)
#define YY_REDUCE_MIN   (-143)
#define YY_REDUCE_MAX   (1231)
static const short yy_reduce_ofst[] = {
 /*     0 */  -143,  949,  136,  131,  -48,  -45,  158,  241,   22,  153,
 /*    10 */   226,  163,  362,  364,  366,  312,  314,  368,  237,  236,
 /*    20 */   300,  440,  114,  359,  319,  100,  100,  100,  100,  100,
 /*    30 */   100,  100,  100,  100,  100,  100,  100,  100,  100,  100,
 /*    40 */   100,  100,  100,  100,  100,  100,  100,  100,  100,  100,
 /*    50 */   100,  100,  100,  100,  374,  447,  461,  516,  518,  567,
 /*    60 */   569,  572,  574,  579,  581,  583,  586,  596,  631,  644,
 /*    70 */   646,  649,  657,  659,  661,  663,  671,  708,  720,  722,
 /*    80 */   759,  771,  773,  810,  822,  824,  861,  873,  875,  930,
 /*    90 */   944,  947,  952,  957,  959,  961,  997,  100,  100,  100,
 /*   100 */   100,  100,  100,  100,  100,  100,  486, -108,  -83,  224,
 /*   110 */   286,  451,  100,  681,  100,  100,  100,  100,  354,  354,
 /*   120 */   354,  337,  352,   49,  482,  482,  503,  532,  -60,  615,
 /*   130 */   647,  689,  690,  737,  782,  -62,  517,  789,  474,  795,
 /*   140 */   580,  733,   32,  662,  488,  139,  678,  433,  769,  772,
 /*   150 */   396,  728,  887,  942,  955,  965,  977,  740,  766,  178,
 /*   160 */   -46,  -17,   59,   53,  118,  141,  167,  248,  255,  326,
 /*   170 */   441,  464,  519,  668,  693,  721,  736,  744,  775,  788,
 /*   180 */   846,  899,  912,  936,  983,  985,   72,  134,  542,  990,
 /*   190 */   991,  597,  992,  998, 1020,  871, 1022, 1027,  915, 1029,
 /*   200 */  1030, 1034,  118, 1035, 1036, 1043, 1044, 1045, 1046,  931,
 /*   210 */   967,  999, 1000, 1001,  597, 1003, 1009, 1058, 1011,  987,
 /*   220 */  1002,  976, 1016,  981, 1039, 1037, 1038, 1047, 1006, 1004,
 /*   230 */  1052, 1053, 1033, 1031, 1079,  994, 1080, 1081, 1005, 1010,
 /*   240 */  1082, 1028, 1062, 1055, 1067, 1071, 1072, 1073, 1101, 1108,
 /*   250 */  1069, 1048, 1078, 1083, 1074, 1110, 1113, 1041, 1049, 1122,
 /*   260 */  1123, 1126, 1118, 1138, 1140, 1144, 1141, 1127, 1133, 1134,
 /*   270 */  1135, 1129, 1136, 1142, 1143, 1146, 1132, 1147, 1148, 1102,
 /*   280 */  1109, 1112, 1111, 1114, 1116, 1117, 1119, 1166, 1170, 1120,
 /*   290 */  1158, 1121, 1124, 1165, 1145, 1149, 1155, 1159, 1161, 1201,
 /*   300 */  1209, 1220, 1222, 1225, 1226, 1227, 1228, 1151, 1152, 1150,
 /*   310 */  1215, 1217, 1203, 1205, 1231,


};
static const YYACTIONTYPE yy_default[] = {
 /*     0 */  1250, 1240, 1240, 1240, 1174, 1174, 1174, 1240, 1071, 1100,
 /*    10 */  1100, 1224, 1301, 1301, 1301, 1301, 1301, 1301, 1173, 1301,
 /*    20 */  1301, 1301, 1301, 1240, 1075, 1106, 1301, 1301, 1301, 1301,
 /*    30 */  1301, 1301, 1301, 1301, 1223, 1225, 1114, 1113, 1206, 1087,
 /*    40 */  1111, 1104, 1108, 1175, 1169, 1170, 1168, 1172, 1176, 1301,
................................................................................
** to revert to identifiers if they keyword does not apply in the context where
** it appears.
*/
#ifdef YYFALLBACK
static const YYCODETYPE yyFallback[] = {
    0,  /*          $ => nothing */
    0,  /*       SEMI => nothing */
   27,  /*    EXPLAIN => ID */
   27,  /*      QUERY => ID */
   27,  /*       PLAN => ID */
   27,  /*      BEGIN => ID */
    0,  /* TRANSACTION => nothing */
   27,  /*   DEFERRED => ID */
   27,  /*  IMMEDIATE => ID */
   27,  /*  EXCLUSIVE => ID */
    0,  /*     COMMIT => nothing */
   27,  /*        END => ID */
   27,  /*   ROLLBACK => ID */
   27,  /*  SAVEPOINT => ID */
   27,  /*    RELEASE => ID */
    0,  /*         TO => nothing */
    0,  /*      TABLE => nothing */
    0,  /*     CREATE => nothing */
   27,  /*         IF => ID */
    0,  /*        NOT => nothing */
    0,  /*     EXISTS => nothing */
   27,  /*       TEMP => ID */
    0,  /*         LP => nothing */
    0,  /*         RP => nothing */
    0,  /*         AS => nothing */
   27,  /*    WITHOUT => ID */
    0,  /*      COMMA => nothing */




























    0,  /*         ID => nothing */
    0,  /*    INDEXED => nothing */
   27,  /*      ABORT => ID */
   27,  /*     ACTION => ID */
   27,  /*      AFTER => ID */
   27,  /*    ANALYZE => ID */
   27,  /*        ASC => ID */
   27,  /*     ATTACH => ID */
   27,  /*     BEFORE => ID */
   27,  /*         BY => ID */
   27,  /*    CASCADE => ID */
   27,  /*       CAST => ID */
   27,  /*   COLUMNKW => ID */
   27,  /*   CONFLICT => ID */
   27,  /*   DATABASE => ID */
   27,  /*       DESC => ID */
   27,  /*     DETACH => ID */
   27,  /*       EACH => ID */
   27,  /*       FAIL => ID */
   27,  /*        FOR => ID */
   27,  /*     IGNORE => ID */
   27,  /*  INITIALLY => ID */
   27,  /*    INSTEAD => ID */
   27,  /*    LIKE_KW => ID */
   27,  /*      MATCH => ID */
   27,  /*         NO => ID */
   27,  /*        KEY => ID */
   27,  /*         OF => ID */
   27,  /*     OFFSET => ID */
   27,  /*     PRAGMA => ID */
   27,  /*      RAISE => ID */
   27,  /*  RECURSIVE => ID */
   27,  /*    REPLACE => ID */
   27,  /*   RESTRICT => ID */
   27,  /*        ROW => ID */
   27,  /*    TRIGGER => ID */
   27,  /*     VACUUM => ID */
   27,  /*       VIEW => ID */
   27,  /*    VIRTUAL => ID */
   27,  /*       WITH => ID */
   27,  /*    REINDEX => ID */
   27,  /*     RENAME => ID */
   27,  /*   CTIME_KW => ID */
};
#endif /* YYFALLBACK */

/* The following structure represents a single element of the
** parser's stack.  Information stored includes:
**
**   +  The state number for the parser at this level of the stack.
................................................................................
static const char *const yyTokenName[] = { 
  "$",             "SEMI",          "EXPLAIN",       "QUERY",       
  "PLAN",          "BEGIN",         "TRANSACTION",   "DEFERRED",    
  "IMMEDIATE",     "EXCLUSIVE",     "COMMIT",        "END",         
  "ROLLBACK",      "SAVEPOINT",     "RELEASE",       "TO",          
  "TABLE",         "CREATE",        "IF",            "NOT",         
  "EXISTS",        "TEMP",          "LP",            "RP",          
  "AS",            "WITHOUT",       "COMMA",         "ID",          







  "INDEXED",       "ABORT",         "ACTION",        "AFTER",       
  "ANALYZE",       "ASC",           "ATTACH",        "BEFORE",      
  "BY",            "CASCADE",       "CAST",          "COLUMNKW",    
  "CONFLICT",      "DATABASE",      "DESC",          "DETACH",      
  "EACH",          "FAIL",          "FOR",           "IGNORE",      
  "INITIALLY",     "INSTEAD",       "LIKE_KW",       "MATCH",       
  "NO",            "KEY",           "OF",            "OFFSET",      
  "PRAGMA",        "RAISE",         "RECURSIVE",     "REPLACE",     
  "RESTRICT",      "ROW",           "TRIGGER",       "VACUUM",      
  "VIEW",          "VIRTUAL",       "WITH",          "REINDEX",     
  "RENAME",        "CTIME_KW",      "ANY",           "OR",          
  "AND",           "IS",            "BETWEEN",       "IN",          
  "ISNULL",        "NOTNULL",       "NE",            "EQ",          
  "GT",            "LE",            "LT",            "GE",          
  "ESCAPE",        "BITAND",        "BITOR",         "LSHIFT",      
  "RSHIFT",        "PLUS",          "MINUS",         "STAR",        
  "SLASH",         "REM",           "CONCAT",        "COLLATE",     
  "BITNOT",        "STRING",        "JOIN_KW",       "CONSTRAINT",  
  "DEFAULT",       "NULL",          "PRIMARY",       "UNIQUE",      
  "CHECK",         "REFERENCES",    "AUTOINCR",      "ON",          
  "INSERT",        "DELETE",        "UPDATE",        "SET",         
  "DEFERRABLE",    "FOREIGN",       "DROP",          "UNION",       
  "ALL",           "EXCEPT",        "INTERSECT",     "SELECT",      
  "VALUES",        "DISTINCT",      "DOT",           "FROM",        
  "JOIN",          "USING",         "ORDER",         "GROUP",       
................................................................................
  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);
  spanSet(&yymsp[-4].minor.yy342,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-X*/
  yymsp[-4].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);
}
        break;
      case 156: /* expr ::= VARIABLE */
{
  Token t = yymsp[0].minor.yy0; /*A-overwrites-X*/
  if( t.n>=2 && t.z[0]=='#' && sqlite3Isdigit(t.z[1]) ){



    /* When doing a nested parse, one can include terms in an expression
    ** that look like this:   #1 #2 ...  These terms refer to registers
    ** in the virtual machine.  #N is the N-th register. */


    spanSet(&yymsp[0].minor.yy342, &t, &t);
    if( pParse->nested==0 ){
      sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &t);
      yymsp[0].minor.yy342.pExpr = 0;
    }else{
      yymsp[0].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_REGISTER, 0, 0, &t);
      if( yymsp[0].minor.yy342.pExpr ) sqlite3GetInt32(&t.z[1], &yymsp[0].minor.yy342.pExpr->iTable);
    }
  }else{
    spanExpr(&yymsp[0].minor.yy342, pParse, TK_VARIABLE, t);
    sqlite3ExprAssignVarNumber(pParse, yymsp[0].minor.yy342.pExpr);
  }
}
        break;
      case 157: /* expr ::= expr COLLATE ID|STRING */
{
  yymsp[-2].minor.yy342.pExpr = sqlite3ExprAddCollateToken(pParse, yymsp[-2].minor.yy342.pExpr, &yymsp[0].minor.yy0, 1);
  yymsp[-2].minor.yy342.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
................................................................................
    yymsp[-4].minor.yy342.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
  }
        break;
      case 188: /* expr ::= LP select RP */
{
    spanSet(&yymsp[-2].minor.yy342,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-B*/
    yymsp[-2].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_SELECT, 0, 0, 0);
    if( yymsp[-2].minor.yy342.pExpr ){
      yymsp[-2].minor.yy342.pExpr->x.pSelect = yymsp[-1].minor.yy159;
      ExprSetProperty(yymsp[-2].minor.yy342.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, yymsp[-2].minor.yy342.pExpr);
    }else{
      sqlite3SelectDelete(pParse->db, yymsp[-1].minor.yy159);
    }
  }
        break;
      case 189: /* expr ::= expr in_op LP select RP */
{
    yymsp[-4].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy342.pExpr, 0, 0);
    if( yymsp[-4].minor.yy342.pExpr ){
      yymsp[-4].minor.yy342.pExpr->x.pSelect = yymsp[-1].minor.yy159;
      ExprSetProperty(yymsp[-4].minor.yy342.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, yymsp[-4].minor.yy342.pExpr);
    }else{
      sqlite3SelectDelete(pParse->db, yymsp[-1].minor.yy159);
    }
    exprNot(pParse, yymsp[-3].minor.yy392, &yymsp[-4].minor.yy342);
    yymsp[-4].minor.yy342.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
  }
        break;
      case 190: /* expr ::= expr in_op nm dbnm */
{
    SrcList *pSrc = sqlite3SrcListAppend(pParse->db, 0,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0);

    yymsp[-3].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-3].minor.yy342.pExpr, 0, 0);
    if( yymsp[-3].minor.yy342.pExpr ){
      yymsp[-3].minor.yy342.pExpr->x.pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0,0);
      ExprSetProperty(yymsp[-3].minor.yy342.pExpr, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, yymsp[-3].minor.yy342.pExpr);
    }else{
      sqlite3SrcListDelete(pParse->db, pSrc);
    }
    exprNot(pParse, yymsp[-2].minor.yy392, &yymsp[-3].minor.yy342);
    yymsp[-3].minor.yy342.zEnd = yymsp[0].minor.yy0.z ? &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] : &yymsp[-1].minor.yy0.z[yymsp[-1].minor.yy0.n];
  }
        break;
      case 191: /* expr ::= EXISTS LP select RP */
{
    Expr *p;
    spanSet(&yymsp[-3].minor.yy342,&yymsp[-3].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-B*/
    p = yymsp[-3].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_EXISTS, 0, 0, 0);
    if( p ){
      p->x.pSelect = yymsp[-1].minor.yy159;
      ExprSetProperty(p, EP_xIsSelect|EP_Subquery);
      sqlite3ExprSetHeightAndFlags(pParse, p);
    }else{
      sqlite3SelectDelete(pParse->db, yymsp[-1].minor.yy159);
    }
  }
        break;
      case 192: /* expr ::= CASE case_operand case_exprlist case_else END */
{
  spanSet(&yymsp[-4].minor.yy342,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0);  /*A-overwrites-C*/
  yymsp[-4].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_CASE, yymsp[-3].minor.yy122, 0, 0);
  if( yymsp[-4].minor.yy342.pExpr ){
................................................................................
    /* If the pParse->declareVtab flag is set, do not delete any table 
    ** structure built up in pParse->pNewTable. The calling code (see vtab.c)
    ** will take responsibility for freeing the Table structure.
    */
    sqlite3DeleteTable(db, pParse->pNewTable);
  }

  sqlite3WithDelete(db, pParse->pWithToFree);
  sqlite3DeleteTrigger(db, pParse->pNewTrigger);
  for(i=pParse->nzVar-1; i>=0; i--) sqlite3DbFree(db, pParse->azVar[i]);
  sqlite3DbFree(db, pParse->azVar);
  while( pParse->pAinc ){
    AutoincInfo *p = pParse->pAinc;
    pParse->pAinc = p->pNext;
    sqlite3DbFree(db, p);
................................................................................
      static const struct {
        int op;      /* The opcode */
        u32 mask;    /* Mask of the bit in sqlite3.flags to set/clear */
      } aFlagOp[] = {
        { SQLITE_DBCONFIG_ENABLE_FKEY,           SQLITE_ForeignKeys    },
        { SQLITE_DBCONFIG_ENABLE_TRIGGER,        SQLITE_EnableTrigger  },
        { SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, SQLITE_Fts3Tokenizer  },

      };
      unsigned int i;
      rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
      for(i=0; i<ArraySize(aFlagOp); i++){
        if( aFlagOp[i].op==op ){
          int onoff = va_arg(ap, int);
          int *pRes = va_arg(ap, int*);
................................................................................
**
**     lower('I', 'en_us') -> 'i'
**     lower('I', 'tr_tr') -> 'ı' (small dotless i)
**
** http://www.icu-project.org/userguide/posix.html#case_mappings
*/
static void icuCaseFunc16(sqlite3_context *p, int nArg, sqlite3_value **apArg){
  const UChar *zInput;
  UChar *zOutput = 0;
  int nInput;
  int nOut;
  int cnt;

  UErrorCode status;
  const char *zLocale = 0;

  assert(nArg==1 || nArg==2);

  if( nArg==2 ){
    zLocale = (const char *)sqlite3_value_text(apArg[1]);
  }

  zInput = sqlite3_value_text16(apArg[0]);
  if( !zInput ){
    return;
................................................................................
    if( zNew==0 ){
      sqlite3_free(zOutput);
      sqlite3_result_error_nomem(p);
      return;
    }
    zOutput = zNew;
    status = U_ZERO_ERROR;
    if( sqlite3_user_data(p) ){
      nOut = 2*u_strToUpper(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
    }else{
      nOut = 2*u_strToLower(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
    }

    if( !U_SUCCESS(status) ){

      if( status==U_BUFFER_OVERFLOW_ERROR ) continue;
      icuFunctionError(p,



          sqlite3_user_data(p) ? "u_strToUpper" : "u_strToLower", status);

      return;
    }
  }
  sqlite3_result_text16(p, zOutput, nOut, xFree);

}

/*
** Collation sequence destructor function. The pCtx argument points to
** a UCollator structure previously allocated using ucol_open().
*/
static void icuCollationDel(void *pCtx){
................................................................................
*/
SQLITE_API sqlite3rbu *SQLITE_STDCALL sqlite3rbu_open(
  const char *zTarget, 
  const char *zRbu,
  const char *zState
);

































/*
** Internally, each RBU connection uses a separate SQLite database 
** connection to access the target and rbu update databases. This
** API allows the application direct access to these database handles.
**
** The first argument passed to this function must be a valid, open, RBU
** handle. The second argument should be passed zero to access the target
................................................................................
typedef struct RbuState RbuState;
typedef struct rbu_vfs rbu_vfs;
typedef struct rbu_file rbu_file;
typedef struct RbuUpdateStmt RbuUpdateStmt;

#if !defined(SQLITE_AMALGAMATION)
typedef unsigned int u32;

typedef unsigned char u8;
typedef sqlite3_int64 i64;
#endif

/*
** These values must match the values defined in wal.c for the equivalent
** locks. These are not magic numbers as they are part of the SQLite file
** format.
*/
#define WAL_LOCK_WRITE  0
#define WAL_LOCK_CKPT   1
#define WAL_LOCK_READ0  3



/*
** A structure to store values read from the rbu_state table in memory.
*/
struct RbuState {
  int eStage;
  char *zTbl;
................................................................................
  u32 mLock;
  int nFrame;                     /* Entries in aFrame[] array */
  int nFrameAlloc;                /* Allocated size of aFrame[] array */
  RbuFrame *aFrame;
  int pgsz;
  u8 *aBuf;
  i64 iWalCksum;




};

/*
** An rbu VFS is implemented using an instance of this structure.
*/
struct rbu_vfs {
  sqlite3_vfs base;               /* rbu VFS shim methods */
................................................................................
  sqlite3_file *pReal;            /* Underlying file handle */
  rbu_vfs *pRbuVfs;               /* Pointer to the rbu_vfs object */
  sqlite3rbu *pRbu;               /* Pointer to rbu object (rbu target only) */

  int openFlags;                  /* Flags this file was opened with */
  u32 iCookie;                    /* Cookie value for main db files */
  u8 iWriteVer;                   /* "write-version" value for main db files */


  int nShm;                       /* Number of entries in apShm[] array */
  char **apShm;                   /* Array of mmap'd *-shm regions */
  char *zDel;                     /* Delete this when closing file */

  const char *zWal;               /* Wal filename for this main db file */
  rbu_file *pWalFd;               /* Wal file descriptor for this main db */
  rbu_file *pMainNext;            /* Next MAIN_DB file */
};







/*************************************************************************
** The following three functions, found below:
**
**   rbuDeltaGetInt()
**   rbuDeltaChecksum()
**   rbuDeltaApply()
................................................................................
  }
  return rc;
}


/*
** The implementation of the rbu_target_name() SQL function. This function

** accepts one argument - the name of a table in the RBU database. If the


** table name matches the pattern:
**
**     data[0-9]_<name>
**
** where <name> is any sequence of 1 or more characters, <name> is returned.
** Otherwise, if the only argument does not match the above pattern, an SQL
** NULL is returned.
**
**     "data_t1"     -> "t1"
**     "data0123_t2" -> "t2"
**     "dataAB_t3"   -> NULL



*/
static void rbuTargetNameFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){

  const char *zIn;
  assert( argc==1 );

  zIn = (const char*)sqlite3_value_text(argv[0]);






  if( zIn && strlen(zIn)>4 && memcmp("data", zIn, 4)==0 ){
    int i;
    for(i=4; zIn[i]>='0' && zIn[i]<='9'; i++);
    if( zIn[i]=='_' && zIn[i+1] ){
      sqlite3_result_text(context, &zIn[i+1], -1, SQLITE_STATIC);


    }
  }
}

/*
** Initialize the iterator structure passed as the second argument.
**
................................................................................
** error code is returned.
*/
static int rbuObjIterFirst(sqlite3rbu *p, RbuObjIter *pIter){
  int rc;
  memset(pIter, 0, sizeof(RbuObjIter));

  rc = prepareAndCollectError(p->dbRbu, &pIter->pTblIter, &p->zErrmsg, 

      "SELECT rbu_target_name(name) AS target, name FROM sqlite_master "
      "WHERE type IN ('table', 'view') AND target IS NOT NULL "
      "ORDER BY name"
  );

  if( rc==SQLITE_OK ){
    rc = prepareAndCollectError(p->dbMain, &pIter->pIdxIter, &p->zErrmsg,
        "SELECT name, rootpage, sql IS NULL OR substr(8, 6)=='UNIQUE' "
................................................................................
        bRbuRowid = 1;
      }
    }
    sqlite3_finalize(pStmt);
    pStmt = 0;

    if( p->rc==SQLITE_OK

     && bRbuRowid!=(pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
    ){
      p->rc = SQLITE_ERROR;
      p->zErrmsg = sqlite3_mprintf(
          "table %q %s rbu_rowid column", pIter->zDataTbl,
          (bRbuRowid ? "may not have" : "requires")
      );
................................................................................
      /* An integer primary key. If the table has an explicit IPK, use
      ** its name. Otherwise, use "rbu_rowid".  */
      if( pIter->eType==RBU_PK_IPK ){
        int i;
        for(i=0; pIter->abTblPk[i]==0; i++);
        assert( i<pIter->nTblCol );
        zCol = pIter->azTblCol[i];


      }else{
        zCol = "rbu_rowid";
      }
      zType = "INTEGER";
    }else{
      zCol = pIter->azTblCol[iCid];
      zType = pIter->azTblType[iCid];
................................................................................
        p->rc = prepareFreeAndCollectError(
            p->dbMain, &pIter->pInsert, &p->zErrmsg,
          sqlite3_mprintf("INSERT INTO \"rbu_imp_%w\" VALUES(%s)", zTbl, zBind)
        );
      }

      /* And to delete index entries */
      if( p->rc==SQLITE_OK ){
        p->rc = prepareFreeAndCollectError(
            p->dbMain, &pIter->pDelete, &p->zErrmsg,
          sqlite3_mprintf("DELETE FROM \"rbu_imp_%w\" WHERE %s", zTbl, zWhere)
        );
      }

      /* Create the SELECT statement to read keys in sorted order */
      if( p->rc==SQLITE_OK ){
        char *zSql;









        if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
          zSql = sqlite3_mprintf(
              "SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' ORDER BY %s%s",
              zCollist, p->zStateDb, pIter->zDataTbl,
              zCollist, zLimit
          );
        }else{
................................................................................
      }

      sqlite3_free(zImposterCols);
      sqlite3_free(zImposterPK);
      sqlite3_free(zWhere);
      sqlite3_free(zBind);
    }else{
      int bRbuRowid = (pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE);


      const char *zTbl = pIter->zTbl;       /* Table this step applies to */
      const char *zWrite;                   /* Imposter table name */

      char *zBindings = rbuObjIterGetBindlist(p, pIter->nTblCol + bRbuRowid);
      char *zWhere = rbuObjIterGetWhere(p, pIter);
      char *zOldlist = rbuObjIterGetOldlist(p, pIter, "old");
      char *zNewlist = rbuObjIterGetOldlist(p, pIter, "new");
................................................................................
            sqlite3_mprintf(
              "INSERT INTO \"%s%w\"(%s%s) VALUES(%s)", 
              zWrite, zTbl, zCollist, (bRbuRowid ? ", _rowid_" : ""), zBindings
            )
        );
      }

      /* Create the DELETE statement to write to the target PK b-tree */


      if( p->rc==SQLITE_OK ){
        p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pDelete, pz,
            sqlite3_mprintf(
              "DELETE FROM \"%s%w\" WHERE %s", zWrite, zTbl, zWhere
            )
        );
      }

      if( pIter->abIndexed ){
        const char *zRbuRowid = "";
        if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
          zRbuRowid = ", rbu_rowid";
        }

        /* Create the rbu_tmp_xxx table and the triggers to populate it. */
        rbuMPrintfExec(p, p->dbRbu,
................................................................................
        }

        rbuObjIterPrepareTmpInsert(p, pIter, zCollist, zRbuRowid);
      }

      /* Create the SELECT statement to read keys from data_xxx */
      if( p->rc==SQLITE_OK ){




        p->rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pSelect, pz,
            sqlite3_mprintf(
              "SELECT %s, rbu_control%s FROM '%q'%s", 
              zCollist, (bRbuRowid ? ", rbu_rowid" : ""), 



              pIter->zDataTbl, zLimit
            )
        );
      }

      sqlite3_free(zWhere);
      sqlite3_free(zOldlist);
................................................................................
    sqlite3_free(zWhere);
    sqlite3_free(zSet);
  }

  return p->rc;
}

static sqlite3 *rbuOpenDbhandle(sqlite3rbu *p, const char *zName){




  sqlite3 *db = 0;
  if( p->rc==SQLITE_OK ){
    const int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_URI;
    p->rc = sqlite3_open_v2(zName, &db, flags, p->zVfsName);
    if( p->rc ){
      p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
      sqlite3_close(db);
      db = 0;
    }
  }
  return db;
}

/*

























































































** Open the database handle and attach the RBU database as "rbu". If an
** error occurs, leave an error code and message in the RBU handle.
*/
static void rbuOpenDatabase(sqlite3rbu *p){
  assert( p->rc==SQLITE_OK );
  assert( p->dbMain==0 && p->dbRbu==0 );


  p->eStage = 0;
  p->dbMain = rbuOpenDbhandle(p, p->zTarget);

  p->dbRbu = rbuOpenDbhandle(p, p->zRbu);





  /* If using separate RBU and state databases, attach the state database to
  ** the RBU db handle now.  */
  if( p->zState ){
    rbuMPrintfExec(p, p->dbRbu, "ATTACH %Q AS stat", p->zState);
    memcpy(p->zStateDb, "stat", 4);
  }else{
    memcpy(p->zStateDb, "main", 4);
  }



























































































  if( p->rc==SQLITE_OK ){
    p->rc = sqlite3_create_function(p->dbMain, 
        "rbu_tmp_insert", -1, SQLITE_UTF8, (void*)p, rbuTmpInsertFunc, 0, 0
    );
  }

................................................................................
    p->rc = sqlite3_create_function(p->dbMain, 
        "rbu_fossil_delta", 2, SQLITE_UTF8, 0, rbuFossilDeltaFunc, 0, 0
    );
  }

  if( p->rc==SQLITE_OK ){
    p->rc = sqlite3_create_function(p->dbRbu, 
        "rbu_target_name", 1, SQLITE_UTF8, (void*)p, rbuTargetNameFunc, 0, 0
    );
  }

  if( p->rc==SQLITE_OK ){
    p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
  }
  rbuMPrintfExec(p, p->dbMain, "SELECT * FROM sqlite_master");
................................................................................
** on the database file. This proc moves the *-oal file to the *-wal path,
** then reopens the database file (this time in vanilla, non-oal, WAL mode).
** If an error occurs, leave an error code and error message in the rbu 
** handle.
*/
static void rbuMoveOalFile(sqlite3rbu *p){
  const char *zBase = sqlite3_db_filename(p->dbMain, "main");







  char *zWal = sqlite3_mprintf("%s-wal", zBase);
  char *zOal = sqlite3_mprintf("%s-oal", zBase);

  assert( p->eStage==RBU_STAGE_MOVE );
  assert( p->rc==SQLITE_OK && p->zErrmsg==0 );
  if( zWal==0 || zOal==0 ){
    p->rc = SQLITE_NOMEM;
  }else{
    /* Move the *-oal file to *-wal. At this point connection p->db is
................................................................................
    rbuLockDatabase(p);
    if( p->rc==SQLITE_OK ){
      rbuFileSuffix3(zBase, zWal);
      rbuFileSuffix3(zBase, zOal);

      /* Re-open the databases. */
      rbuObjIterFinalize(&p->objiter);
      sqlite3_close(p->dbMain);
      sqlite3_close(p->dbRbu);
      p->dbMain = 0;
      p->dbRbu = 0;

#if defined(_WIN32_WCE)
      {
        LPWSTR zWideOal;
        LPWSTR zWideWal;
................................................................................
      continue;
    }

    pVal = sqlite3_column_value(pIter->pSelect, i);
    p->rc = sqlite3_bind_value(pWriter, i+1, pVal);
    if( p->rc ) return;
  }
  if( pIter->zIdx==0

   && (pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE) 

  ){
    /* For a virtual table, or a table with no primary key, the 
    ** SELECT statement is:
    **
    **   SELECT <cols>, rbu_control, rbu_rowid FROM ....
    **
    ** Hence column_value(pIter->nCol+1).
    */
    assertColumnName(pIter->pSelect, pIter->nCol+1, "rbu_rowid");


    pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
    p->rc = sqlite3_bind_value(pWriter, pIter->nCol+1, pVal);

  }
  if( p->rc==SQLITE_OK ){
    sqlite3_step(pWriter);
    p->rc = resetAndCollectError(pWriter, &p->zErrmsg);
  }
}

................................................................................
    }
  }
  return p->rc;
}

/*
** Increment the schema cookie of the main database opened by p->dbMain.




*/
static void rbuIncrSchemaCookie(sqlite3rbu *p){
  if( p->rc==SQLITE_OK ){

    int iCookie = 1000000;
    sqlite3_stmt *pStmt;

    p->rc = prepareAndCollectError(p->dbMain, &pStmt, &p->zErrmsg, 
        "PRAGMA schema_version"
    );
    if( p->rc==SQLITE_OK ){
      /* Coverage: it may be that this sqlite3_step() cannot fail. There
      ** is already a transaction open, so the prepared statement cannot
      ** throw an SQLITE_SCHEMA exception. The only database page the
      ** statement reads is page 1, which is guaranteed to be in the cache.
................................................................................
** Update the contents of the rbu_state table within the rbu database. The
** value stored in the RBU_STATE_STAGE column is eStage. All other values
** are determined by inspecting the rbu handle passed as the first argument.
*/
static void rbuSaveState(sqlite3rbu *p, int eStage){
  if( p->rc==SQLITE_OK || p->rc==SQLITE_DONE ){
    sqlite3_stmt *pInsert = 0;

    int rc;

    assert( p->zErrmsg==0 );
    rc = prepareFreeAndCollectError(p->dbRbu, &pInsert, &p->zErrmsg, 
        sqlite3_mprintf(
          "INSERT OR REPLACE INTO %s.rbu_state(k, v) VALUES "
          "(%d, %d), "
................................................................................
          p->zStateDb,
          RBU_STATE_STAGE, eStage,
          RBU_STATE_TBL, p->objiter.zTbl, 
          RBU_STATE_IDX, p->objiter.zIdx, 
          RBU_STATE_ROW, p->nStep, 
          RBU_STATE_PROGRESS, p->nProgress,
          RBU_STATE_CKPT, p->iWalCksum,
          RBU_STATE_COOKIE, (i64)p->pTargetFd->iCookie,
          RBU_STATE_OALSZ, p->iOalSz,
          RBU_STATE_PHASEONESTEP, p->nPhaseOneStep
      )
    );
    assert( pInsert==0 || rc==SQLITE_OK );

    if( rc==SQLITE_OK ){
................................................................................
      sqlite3_step(pInsert);
      rc = sqlite3_finalize(pInsert);
    }
    if( rc!=SQLITE_OK ) p->rc = rc;
  }
}


/*






















































































** Step the RBU object.
*/
SQLITE_API int SQLITE_STDCALL sqlite3rbu_step(sqlite3rbu *p){
  if( p ){
    switch( p->eStage ){
      case RBU_STAGE_OAL: {
        RbuObjIter *pIter = &p->objiter;









        while( p->rc==SQLITE_OK && pIter->zTbl ){

          if( pIter->bCleanup ){
            /* Clean up the rbu_tmp_xxx table for the previous table. It 
            ** cannot be dropped as there are currently active SQL statements.
            ** But the contents can be deleted.  */
            if( pIter->abIndexed ){
              rbuMPrintfExec(p, p->dbRbu, 
                  "DELETE FROM %s.'rbu_tmp_%q'", p->zStateDb, pIter->zDataTbl
              );
            }
          }else{
            rbuObjIterPrepareAll(p, pIter, 0);

................................................................................
    }
    return p->rc;
  }else{
    return SQLITE_NOMEM;
  }
}

/*
** Free an RbuState object allocated by rbuLoadState().
*/
static void rbuFreeState(RbuState *p){
  if( p ){
    sqlite3_free(p->zTbl);
    sqlite3_free(p->zIdx);
    sqlite3_free(p);
  }
}

/*
** Allocate an RbuState object and load the contents of the rbu_state 
** table into it. Return a pointer to the new object. It is the 
** responsibility of the caller to eventually free the object using
** sqlite3_free().
**
** If an error occurs, leave an error code and message in the rbu handle
** and return NULL.
*/
static RbuState *rbuLoadState(sqlite3rbu *p){
  RbuState *pRet = 0;
  sqlite3_stmt *pStmt = 0;
  int rc;
  int rc2;

  pRet = (RbuState*)rbuMalloc(p, sizeof(RbuState));
  if( pRet==0 ) return 0;

  rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg, 
      sqlite3_mprintf("SELECT k, v FROM %s.rbu_state", p->zStateDb)
  );
  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
    switch( sqlite3_column_int(pStmt, 0) ){
      case RBU_STATE_STAGE:
        pRet->eStage = sqlite3_column_int(pStmt, 1);
        if( pRet->eStage!=RBU_STAGE_OAL
         && pRet->eStage!=RBU_STAGE_MOVE
         && pRet->eStage!=RBU_STAGE_CKPT
        ){
          p->rc = SQLITE_CORRUPT;
        }
        break;

      case RBU_STATE_TBL:
        pRet->zTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
        break;

      case RBU_STATE_IDX:
        pRet->zIdx = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
        break;

      case RBU_STATE_ROW:
        pRet->nRow = sqlite3_column_int(pStmt, 1);
        break;

      case RBU_STATE_PROGRESS:
        pRet->nProgress = sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_CKPT:
        pRet->iWalCksum = sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_COOKIE:
        pRet->iCookie = (u32)sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_OALSZ:
        pRet->iOalSz = (u32)sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_PHASEONESTEP:
        pRet->nPhaseOneStep = sqlite3_column_int64(pStmt, 1);
        break;

      default:
        rc = SQLITE_CORRUPT;
        break;
    }
  }
  rc2 = sqlite3_finalize(pStmt);
  if( rc==SQLITE_OK ) rc = rc2;

  p->rc = rc;
  return pRet;
}

/*
** Compare strings z1 and z2, returning 0 if they are identical, or non-zero
** otherwise. Either or both argument may be NULL. Two NULL values are
** considered equal, and NULL is considered distinct from all other values.
*/
static int rbuStrCompare(const char *z1, const char *z2){
  if( z1==0 && z2==0 ) return 0;
................................................................................
        }
        p->rc = sqlite3_finalize(pStmt);
      }
    }
  }
}

/*

** Open and return a new RBU handle. 
*/
SQLITE_API sqlite3rbu *SQLITE_STDCALL sqlite3rbu_open(
  const char *zTarget, 
  const char *zRbu,
  const char *zState
){
  sqlite3rbu *p;
  size_t nTarget = strlen(zTarget);
  size_t nRbu = strlen(zRbu);
  size_t nState = zState ? strlen(zState) : 0;
  size_t nByte = sizeof(sqlite3rbu) + nTarget+1 + nRbu+1+ nState+1;

  p = (sqlite3rbu*)sqlite3_malloc64(nByte);
  if( p ){
    RbuState *pState = 0;

    /* Create the custom VFS. */
    memset(p, 0, sizeof(sqlite3rbu));
    rbuCreateVfs(p);

    /* Open the target database */
    if( p->rc==SQLITE_OK ){


      p->zTarget = (char*)&p[1];
      memcpy(p->zTarget, zTarget, nTarget+1);


      p->zRbu = &p->zTarget[nTarget+1];
      memcpy(p->zRbu, zRbu, nRbu+1);

      if( zState ){
        p->zState = &p->zRbu[nRbu+1];
        memcpy(p->zState, zState, nState+1);
      }
      rbuOpenDatabase(p);
    }

    /* If it has not already been created, create the rbu_state table */
    rbuMPrintfExec(p, p->dbRbu, RBU_CREATE_STATE, p->zStateDb);

    if( p->rc==SQLITE_OK ){
      pState = rbuLoadState(p);
      assert( pState || p->rc!=SQLITE_OK );
      if( p->rc==SQLITE_OK ){

        if( pState->eStage==0 ){ 
          rbuDeleteOalFile(p);
................................................................................
        p->zErrmsg = sqlite3_mprintf("cannot update wal mode database");
      }else if( p->eStage==RBU_STAGE_MOVE ){
        p->eStage = RBU_STAGE_CKPT;
        p->nStep = 0;
      }
    }

    if( p->rc==SQLITE_OK
     && (p->eStage==RBU_STAGE_OAL || p->eStage==RBU_STAGE_MOVE)
     && pState->eStage!=0 && p->pTargetFd->iCookie!=pState->iCookie
    ){   


      /* At this point (pTargetFd->iCookie) contains the value of the
      ** change-counter cookie (the thing that gets incremented when a 
      ** transaction is committed in rollback mode) currently stored on 
      ** page 1 of the database file. */
      p->rc = SQLITE_BUSY;
      p->zErrmsg = sqlite3_mprintf("database modified during rbu update");



    }

    if( p->rc==SQLITE_OK ){
      if( p->eStage==RBU_STAGE_OAL ){
        sqlite3 *db = p->dbMain;






        /* Open transactions both databases. The *-oal file is opened or
        ** created at this point. */

        p->rc = sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, &p->zErrmsg);

        if( p->rc==SQLITE_OK ){
          p->rc = sqlite3_exec(p->dbRbu, "BEGIN IMMEDIATE", 0, 0, &p->zErrmsg);
        }

        /* Check if the main database is a zipvfs db. If it is, set the upper
        ** level pager to use "journal_mode=off". This prevents it from 
        ** generating a large journal using a temp file.  */
        if( p->rc==SQLITE_OK ){
          int frc = sqlite3_file_control(db, "main", SQLITE_FCNTL_ZIPVFS, 0);
................................................................................

    rbuFreeState(pState);
  }

  return p;
}
























/*
** Return the database handle used by pRbu.
*/
SQLITE_API sqlite3 *SQLITE_STDCALL sqlite3rbu_db(sqlite3rbu *pRbu, int bRbu){
  sqlite3 *db = 0;
  if( pRbu ){
................................................................................
/*
** If the error code currently stored in the RBU handle is SQLITE_CONSTRAINT,
** then edit any error message string so as to remove all occurrences of
** the pattern "rbu_imp_[0-9]*".
*/
static void rbuEditErrmsg(sqlite3rbu *p){
  if( p->rc==SQLITE_CONSTRAINT && p->zErrmsg ){
    int i;
    size_t nErrmsg = strlen(p->zErrmsg);
    for(i=0; i<(nErrmsg-8); i++){
      if( memcmp(&p->zErrmsg[i], "rbu_imp_", 8)==0 ){
        int nDel = 8;
        while( p->zErrmsg[i+nDel]>='0' && p->zErrmsg[i+nDel]<='9' ) nDel++;
        memmove(&p->zErrmsg[i], &p->zErrmsg[i+nDel], nErrmsg + 1 - i - nDel);
        nErrmsg -= nDel;
................................................................................

    if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
      p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
    }

    /* Close any open statement handles. */
    rbuObjIterFinalize(&p->objiter);











    /* Close the open database handle and VFS object. */
    sqlite3_close(p->dbMain);
    sqlite3_close(p->dbRbu);
    rbuDeleteVfs(p);
    sqlite3_free(p->aBuf);
    sqlite3_free(p->aFrame);

    rbuEditErrmsg(p);
    rc = p->rc;
    *pzErrmsg = p->zErrmsg;
................................................................................
*/
static u32 rbuGetU32(u8 *aBuf){
  return ((u32)aBuf[0] << 24)
       + ((u32)aBuf[1] << 16)
       + ((u32)aBuf[2] <<  8)
       + ((u32)aBuf[3]);
}

















/*
** Read data from an rbuVfs-file.
*/
static int rbuVfsRead(
  sqlite3_file *pFile, 
  void *zBuf, 
................................................................................
     && (p->openFlags & SQLITE_OPEN_WAL) 
     && iOfst>=pRbu->iOalSz 
    ){
      rc = SQLITE_OK;
      memset(zBuf, 0, iAmt);
    }else{
      rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);





























    }
    if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
      /* These look like magic numbers. But they are stable, as they are part
       ** of the definition of the SQLite file format, which may not change. */
      u8 *pBuf = (u8*)zBuf;
      p->iCookie = rbuGetU32(&pBuf[24]);
      p->iWriteVer = pBuf[19];
................................................................................
}

/*
** Return the current file-size of an rbuVfs-file.
*/
static int rbuVfsFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
  rbu_file *p = (rbu_file *)pFile;

  return p->pReal->pMethods->xFileSize(p->pReal, pSize);












}

/*
** Lock an rbuVfs-file.
*/
static int rbuVfsLock(sqlite3_file *pFile, int eLock){
  rbu_file *p = (rbu_file*)pFile;
  sqlite3rbu *pRbu = p->pRbu;
  int rc = SQLITE_OK;

  assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
  if( pRbu && eLock==SQLITE_LOCK_EXCLUSIVE && pRbu->eStage!=RBU_STAGE_DONE ){


    /* Do not allow EXCLUSIVE locks. Preventing SQLite from taking this 
    ** prevents it from checkpointing the database from sqlite3_close(). */
    rc = SQLITE_BUSY;
  }else{
    rc = p->pReal->pMethods->xLock(p->pReal, eLock);
  }

................................................................................
        pRbu->pTargetFd = p;
        p->pRbu = pRbu;
        if( p->pWalFd ) p->pWalFd->pRbu = pRbu;
        rc = SQLITE_OK;
      }
    }
    return rc;






  }

  rc = xControl(p->pReal, op, pArg);
  if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
    rbu_vfs *pRbuVfs = p->pRbuVfs;
    char *zIn = *(char**)pArg;
    char *zOut = sqlite3_mprintf("rbu(%s)/%z", pRbuVfs->base.zName, zIn);
................................................................................
static rbu_file *rbuFindMaindb(rbu_vfs *pRbuVfs, const char *zWal){
  rbu_file *pDb;
  sqlite3_mutex_enter(pRbuVfs->mutex);
  for(pDb=pRbuVfs->pMain; pDb && pDb->zWal!=zWal; pDb=pDb->pMainNext){}
  sqlite3_mutex_leave(pRbuVfs->mutex);
  return pDb;
}




























/*
** Open an rbu file handle.
*/
static int rbuVfsOpen(
  sqlite3_vfs *pVfs,
  const char *zName,
................................................................................
    0, 0                          /* xFetch, xUnfetch */
  };
  rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
  sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
  rbu_file *pFd = (rbu_file *)pFile;
  int rc = SQLITE_OK;
  const char *zOpen = zName;


  memset(pFd, 0, sizeof(rbu_file));
  pFd->pReal = (sqlite3_file*)&pFd[1];
  pFd->pRbuVfs = pRbuVfs;
  pFd->openFlags = flags;
  if( zName ){
    if( flags & SQLITE_OPEN_MAIN_DB ){
      /* A main database has just been opened. The following block sets
      ** (pFd->zWal) to point to a buffer owned by SQLite that contains
      ** the name of the *-wal file this db connection will use. SQLite
      ** happens to pass a pointer to this buffer when using xAccess()
      ** or xOpen() to operate on the *-wal file.  */
      int n = (int)strlen(zName);
      const char *z = &zName[n];
      if( flags & SQLITE_OPEN_URI ){
        int odd = 0;
        while( 1 ){
          if( z[0]==0 ){
            odd = 1 - odd;
            if( odd && z[1]==0 ) break;
          }
          z++;
        }
        z += 2;
      }else{
        while( *z==0 ) z++;
      }
      z += (n + 8 + 1);
      pFd->zWal = z;
    }
    else if( flags & SQLITE_OPEN_WAL ){
      rbu_file *pDb = rbuFindMaindb(pRbuVfs, zName);
      if( pDb ){
        if( pDb->pRbu && pDb->pRbu->eStage==RBU_STAGE_OAL ){
          /* This call is to open a *-wal file. Intead, open the *-oal. This
          ** code ensures that the string passed to xOpen() is terminated by a
          ** pair of '\0' bytes in case the VFS attempts to extract a URI 
          ** parameter from it.  */







          size_t nCopy = strlen(zName);
          char *zCopy = sqlite3_malloc64(nCopy+2);
          if( zCopy ){
            memcpy(zCopy, zName, nCopy);
            zCopy[nCopy-3] = 'o';
            zCopy[nCopy] = '\0';
            zCopy[nCopy+1] = '\0';
            zOpen = (const char*)(pFd->zDel = zCopy);
          }else{
            rc = SQLITE_NOMEM;
          }
          pFd->pRbu = pDb->pRbu;
        }
        pDb->pWalFd = pFd;
      }
    }
  }










  if( rc==SQLITE_OK ){
    rc = pRealVfs->xOpen(pRealVfs, zOpen, pFd->pReal, flags, pOutFlags);
  }
  if( pFd->pReal->pMethods ){
    /* The xOpen() operation has succeeded. Set the sqlite3_file.pMethods
    ** pointer and, if the file is a main database file, link it into the
    ** mutex protected linked list of all such files.  */
    pFile->pMethods = &rbuvfs_io_methods;
    if( flags & SQLITE_OPEN_MAIN_DB ){
................................................................................
  u8 *aRight                      /* Change record */
){
  u8 *a1 = aLeft;                 /* Cursor to iterate through aLeft */
  u8 *a2 = aRight;                /* Cursor to iterate through aRight */
  int iCol;                       /* Used to iterate through table columns */

  for(iCol=0; iCol<pTab->nCol; iCol++){

    int n1 = sessionSerialLen(a1);
    int n2 = sessionSerialLen(a2);

    if( pTab->abPK[iCol] && (n1!=n2 || memcmp(a1, a2, n1)) ){
      return 0;
    }



    if( pTab->abPK[iCol] || bLeftPkOnly==0 ) a1 += n1;
    if( pTab->abPK[iCol] || bRightPkOnly==0 ) a2 += n2;

  }

  return 1;
}

/*
** Arguments aLeft and aRight both point to buffers containing change
................................................................................
  char *zPragma;
  sqlite3_stmt *pStmt;
  int rc;
  int nByte;
  int nDbCol = 0;
  int nThis;
  int i;
  u8 *pAlloc;
  char **azCol = 0;
  u8 *abPK;

  assert( pazCol && pabPK );

  nThis = sqlite3Strlen30(zThis);
  zPragma = sqlite3_mprintf("PRAGMA '%q'.table_info('%q')", zDb, zThis);
  if( !zPragma ) return SQLITE_NOMEM;

................................................................................
  SessionTable *pTab;

  for(pTab=pList; pTab; pTab=pNext){
    int i;
    pNext = pTab->pNext;
    for(i=0; i<pTab->nChange; i++){
      SessionChange *p;
      SessionChange *pNext;
      for(p=pTab->apChange[i]; p; p=pNext){
        pNext = p->pNext;
        sqlite3_free(p);
      }
    }
    sqlite3_free((char*)pTab->azCol);  /* cast works around VC++ bug */
    sqlite3_free(pTab->apChange);
    sqlite3_free(pTab);
  }
................................................................................
    }

    if( p->bPatchset && p->op==SQLITE_UPDATE ){
      /* If this is an UPDATE that is part of a patchset, then all PK and
      ** modified fields are present in the new.* record. The old.* record
      ** is currently completely empty. This block shifts the PK fields from
      ** new.* to old.*, to accommodate the code that reads these arrays.  */
      int i;
      for(i=0; i<p->nCol; i++){
        assert( p->apValue[i]==0 );
        assert( p->abPK[i]==0 || p->apValue[i+p->nCol] );
        if( p->abPK[i] ){
          p->apValue[i] = p->apValue[i+p->nCol];
          p->apValue[i+p->nCol] = 0;
        }
................................................................................
  int eType,                      /* Either CHANGESET_DATA or CONFLICT */
  SessionApplyCtx *p,             /* changeset_apply() context */
  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
  int(*xConflict)(void *, int, sqlite3_changeset_iter*),
  void *pCtx,                     /* First argument for conflict handler */
  int *pbReplace                  /* OUT: Set to true if PK row is found */
){
  int res;                        /* Value returned by conflict handler */
  int rc;
  int nCol;
  int op;
  const char *zDummy;

  sqlite3changeset_op(pIter, &zDummy, &nCol, &op, 0);

................................................................................
    }else{
      /* Append a new column value, if necessary */
      assert( iCol>=p->iCol );
      if( iCol!=p->iCol ){
        if( pHash->eDetail==FTS5_DETAIL_FULL ){
          pPtr[p->nData++] = 0x01;
          p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iCol);
          p->iCol = iCol;
          p->iPos = 0;
        }else{
          bNew = 1;
          p->iCol = iPos = iCol;
        }
      }

      /* Append the new position offset, if necessary */
      if( bNew ){
        p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iPos - p->iPos + 2);
        p->iPos = iPos;
................................................................................
    while( a<pEnd ){
      iPrev += (int)a++[0] - 2;
      while( *aiCol<iPrev ){
        aiCol++;
        if( aiCol==aiColEnd ) goto setoutputs_col_out;
      }
      if( *aiCol==iPrev ){
        *aOut++ = (iPrev - iPrevOut) + 2;
        iPrevOut = iPrev;
      }
    }

setoutputs_col_out:
    pIter->base.pData = pIter->poslist.p;
    pIter->base.nData = aOut - pIter->poslist.p;
................................................................................
static void fts5SourceIdFunc(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args */
  sqlite3_value **apUnused        /* Function arguments */
){
  assert( nArg==0 );
  UNUSED_PARAM2(nArg, apUnused);
  sqlite3_result_text(pCtx, "fts5: 2016-03-30 16:23:06 7cf0cab730e2d570c82dd789279ad6501ac598c8", -1, SQLITE_TRANSIENT);
}

static int fts5Init(sqlite3 *db){
  static const sqlite3_module fts5Mod = {
    /* iVersion      */ 2,
    /* xCreate       */ fts5CreateMethod,
    /* xConnect      */ fts5ConnectMethod,

*************************************************************************
** Internal interface definitions for SQLite.
**
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/* Special Comments:
**
** Some comments have special meaning to the tools that measure test
** coverage:
**
**    NO_TEST                     - The branches on this line are not
**                                  measured by branch coverage.  This is
**                                  used on lines of code that actually
**                                  implement parts of coverage testing.
**
**    OPTIMIZATION-IF-TRUE        - This branch is allowed to alway be false
**                                  and the correct answer is still obtained,
**                                  though perhaps more slowly.
**
**    OPTIMIZATION-IF-FALSE       - This branch is allowed to alway be true
**                                  and the correct answer is still obtained,
**                                  though perhaps more slowly.
**
**    PREVENTS-HARMLESS-OVERREAD  - This branch prevents a buffer overread
**                                  that would be harmless and undetectable
**                                  if it did occur.  
**
** In all cases, the special comment must be enclosed in the usual
** slash-asterisk...asterisk-slash comment marks, with no spaces between the 
** asterisks and the comment text.
*/

/*
** Make sure that rand_s() is available on Windows systems with MSVC 2005
** or higher.
*/
#if defined(_MSC_VER) && _MSC_VER>=1400
#  define _CRT_RAND_S
#endif
................................................................................
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.13.0"
#define SQLITE_VERSION_NUMBER 3013000
#define SQLITE_SOURCE_ID      "2016-05-02 13:57:19 e4af967533f290862dfba1d9ef44d4c9ddd8a01b"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** positive to enable fts3_tokenizer() or negative to leave the setting
** unchanged.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether fts3_tokenizer is disabled or enabled
** following this call.  The second parameter may be a NULL pointer, in
** which case the new setting is not reported back. </dd>
**
** <dt>SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION</dt>
** <dd> ^This option is used to enable or disable the [sqlite3_load_extension()]
** interface independently of the [load_extension()] SQL function.
** The [sqlite3_enable_load_extension()] API enables or disables both the
** C-API [sqlite3_load_extension()] and the SQL function [load_extension()].
** There should be two additional arguments.
** When the first argument to this interface is 1, then only the C-API is
** enabled and the SQL function remains disabled.  If the first argment to
** this interface is 0, then both the C-API and the SQL function are disabled.
** If the first argument is -1, then no changes are made to state of either the
** C-API or the SQL function.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether [sqlite3_load_extension()] interface
** is disabled or enabled following this call.  The second parameter may
** be a NULL pointer, in which case the new setting is not reported back.
** </dd>
**
** </dl>
*/
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */


/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
................................................................................
** ^If an error occurs and pzErrMsg is not 0, then the
** [sqlite3_load_extension()] interface shall attempt to
** fill *pzErrMsg with error message text stored in memory
** obtained from [sqlite3_malloc()]. The calling function
** should free this memory by calling [sqlite3_free()].
**
** ^Extension loading must be enabled using
** [sqlite3_enable_load_extension()] or
** [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],1,NULL)
** prior to calling this API,
** otherwise an error will be returned.
**
** <b>Security warning:</b> It is recommended that the 
** [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method be used to enable only this
** interface.  The use of the [sqlite3_enable_load_extension()] interface
** should be avoided.  This will keep the SQL function [load_extension()]
** disabled and prevent SQL injections from giving attackers
** access to extension loading capabilities.
**
** See also the [load_extension() SQL function].
*/
SQLITE_API int SQLITE_STDCALL sqlite3_load_extension(
  sqlite3 *db,          /* Load the extension into this database connection */
  const char *zFile,    /* Name of the shared library containing extension */
  const char *zProc,    /* Entry point.  Derived from zFile if 0 */
................................................................................
** [extension loading] while evaluating user-entered SQL, the following API
** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
**
** ^Extension loading is off by default.
** ^Call the sqlite3_enable_load_extension() routine with onoff==1
** to turn extension loading on and call it with onoff==0 to turn
** it back off again.
**
** ^This interface enables or disables both the C-API
** [sqlite3_load_extension()] and the SQL function [load_extension()].
** Use [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],..)
** to enable or disable only the C-API.
**
** <b>Security warning:</b> It is recommended that extension loading
** be disabled using the [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method
** rather than this interface, so the [load_extension()] SQL function
** remains disabled. This will prevent SQL injections from giving attackers
** access to extension loading capabilities.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_enable_load_extension(sqlite3 *db, int onoff);

/*
** CAPI3REF: Automatically Load Statically Linked Extensions
**
** ^This interface causes the xEntryPoint() function to be invoked for
................................................................................
  sqlite3_snapshot **ppSnapshot
);

/*
** CAPI3REF: Start a read transaction on an historical snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_open(D,S,P)] interface starts a
** read transaction for schema S of
** [database connection] D such that the read transaction
** refers to historical [snapshot] P, rather than the most
** recent change to the database.
** ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK on success
** or an appropriate [error code] if it fails.
**
** ^In order to succeed, a call to [sqlite3_snapshot_open(D,S,P)] must be

** the first operation following the [BEGIN] that takes the schema S
** out of [autocommit mode].
** ^In other words, schema S must not currently be in
** a transaction for [sqlite3_snapshot_open(D,S,P)] to work, but the
** database connection D must be out of [autocommit mode].
** ^A [snapshot] will fail to open if it has been overwritten by a
** [checkpoint].


** ^(A call to [sqlite3_snapshot_open(D,S,P)] will fail if the
** database connection D does not know that the database file for
** schema S is in [WAL mode].  A database connection might not know
** that the database file is in [WAL mode] if there has been no prior
** I/O on that database connection, or if the database entered [WAL mode] 
** after the most recent I/O on the database connection.)^
** (Hint: Run "[PRAGMA application_id]" against a newly opened
** database connection in order to make it ready to use snapshots.)
**
** The [sqlite3_snapshot_open()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL int SQLITE_STDCALL sqlite3_snapshot_open(
  sqlite3 *db,
................................................................................
** The application must eventually free every [sqlite3_snapshot] object
** using this routine to avoid a memory leak.
**
** The [sqlite3_snapshot_free()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL void SQLITE_STDCALL sqlite3_snapshot_free(sqlite3_snapshot*);

/*
** CAPI3REF: Compare the ages of two snapshot handles.
** EXPERIMENTAL
**
** The sqlite3_snapshot_cmp(P1, P2) interface is used to compare the ages
** of two valid snapshot handles. 
**
** If the two snapshot handles are not associated with the same database 
** file, the result of the comparison is undefined. 
**
** Additionally, the result of the comparison is only valid if both of the
** snapshot handles were obtained by calling sqlite3_snapshot_get() since the
** last time the wal file was deleted. The wal file is deleted when the
** database is changed back to rollback mode or when the number of database
** clients drops to zero. If either snapshot handle was obtained before the 
** wal file was last deleted, the value returned by this function 
** is undefined.
**
** Otherwise, this API returns a negative value if P1 refers to an older
** snapshot than P2, zero if the two handles refer to the same database
** snapshot, and a positive value if P1 is a newer snapshot than P2.
*/
SQLITE_API SQLITE_EXPERIMENTAL int SQLITE_STDCALL sqlite3_snapshot_cmp(
  sqlite3_snapshot *p1,
  sqlite3_snapshot *p2
);

/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
................................................................................
#define TK_EXISTS                          20
#define TK_TEMP                            21
#define TK_LP                              22
#define TK_RP                              23
#define TK_AS                              24
#define TK_WITHOUT                         25
#define TK_COMMA                           26
#define TK_OR                              27
#define TK_AND                             28
#define TK_IS                              29
#define TK_MATCH                           30
#define TK_LIKE_KW                         31
#define TK_BETWEEN                         32
#define TK_IN                              33
#define TK_ISNULL                          34
#define TK_NOTNULL                         35
#define TK_NE                              36
#define TK_EQ                              37
#define TK_GT                              38
#define TK_LE                              39
#define TK_LT                              40
#define TK_GE                              41
#define TK_ESCAPE                          42
#define TK_BITAND                          43
#define TK_BITOR                           44
#define TK_LSHIFT                          45
#define TK_RSHIFT                          46
#define TK_PLUS                            47
#define TK_MINUS                           48
#define TK_STAR                            49
#define TK_SLASH                           50
#define TK_REM                             51
#define TK_CONCAT                          52
#define TK_COLLATE                         53
#define TK_BITNOT                          54
#define TK_ID                              55
#define TK_INDEXED                         56
#define TK_ABORT                           57
#define TK_ACTION                          58
#define TK_AFTER                           59
#define TK_ANALYZE                         60
#define TK_ASC                             61
#define TK_ATTACH                          62
#define TK_BEFORE                          63
#define TK_BY                              64
#define TK_CASCADE                         65
#define TK_CAST                            66
#define TK_COLUMNKW                        67
#define TK_CONFLICT                        68
#define TK_DATABASE                        69
#define TK_DESC                            70
#define TK_DETACH                          71
#define TK_EACH                            72
#define TK_FAIL                            73
#define TK_FOR                             74
#define TK_IGNORE                          75
#define TK_INITIALLY                       76
#define TK_INSTEAD                         77


#define TK_NO                              78
#define TK_KEY                             79
#define TK_OF                              80
#define TK_OFFSET                          81
#define TK_PRAGMA                          82
#define TK_RAISE                           83
#define TK_RECURSIVE                       84
#define TK_REPLACE                         85
#define TK_RESTRICT                        86
#define TK_ROW                             87
#define TK_TRIGGER                         88
#define TK_VACUUM                          89
#define TK_VIEW                            90
#define TK_VIRTUAL                         91
#define TK_WITH                            92
#define TK_REINDEX                         93
#define TK_RENAME                          94
#define TK_CTIME_KW                        95
#define TK_ANY                             96


























#define TK_STRING                          97
#define TK_JOIN_KW                         98
#define TK_CONSTRAINT                      99
#define TK_DEFAULT                        100
#define TK_NULL                           101
#define TK_PRIMARY                        102
#define TK_UNIQUE                         103
................................................................................
** A single instruction of the virtual machine has an opcode
** and as many as three operands.  The instruction is recorded
** as an instance of the following structure:
*/
struct VdbeOp {
  u8 opcode;          /* What operation to perform */
  signed char p4type; /* One of the P4_xxx constants for p4 */
  u8 notUsed1;
  u8 p5;              /* Fifth parameter is an unsigned character */
  int p1;             /* First operand */
  int p2;             /* Second parameter (often the jump destination) */
  int p3;             /* The third parameter */
  union p4union {     /* fourth parameter */
    int i;                 /* Integer value if p4type==P4_INT32 */
    void *p;               /* Generic pointer */
................................................................................
#define OP_Checkpoint      8
#define OP_JournalMode     9
#define OP_Vacuum         10
#define OP_VFilter        11 /* synopsis: iplan=r[P3] zplan='P4'           */
#define OP_VUpdate        12 /* synopsis: data=r[P3@P2]                    */
#define OP_Goto           13
#define OP_Gosub          14
#define OP_InitCoroutine  15
#define OP_Yield          16
#define OP_MustBeInt      17
#define OP_Jump           18
#define OP_Not            19 /* same as TK_NOT, synopsis: r[P2]= !r[P1]    */
#define OP_Once           20
#define OP_If             21
#define OP_IfNot          22
#define OP_SeekLT         23 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekLE         24 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGE         25 /* synopsis: key=r[P3@P4]                     */
#define OP_SeekGT         26 /* synopsis: key=r[P3@P4]                     */
#define OP_Or             27 /* same as TK_OR, synopsis: r[P3]=(r[P1] || r[P2]) */
#define OP_And            28 /* same as TK_AND, synopsis: r[P3]=(r[P1] && r[P2]) */
#define OP_NoConflict     29 /* synopsis: key=r[P3@P4]                     */
#define OP_NotFound       30 /* synopsis: key=r[P3@P4]                     */
#define OP_Found          31 /* synopsis: key=r[P3@P4]                     */
#define OP_NotExists      32 /* synopsis: intkey=r[P3]                     */
#define OP_Last           33
#define OP_IsNull         34 /* same as TK_ISNULL, synopsis: if r[P1]==NULL goto P2 */
#define OP_NotNull        35 /* same as TK_NOTNULL, synopsis: if r[P1]!=NULL goto P2 */
#define OP_Ne             36 /* same as TK_NE, synopsis: if r[P1]!=r[P3] goto P2 */
#define OP_Eq             37 /* same as TK_EQ, synopsis: if r[P1]==r[P3] goto P2 */
#define OP_Gt             38 /* same as TK_GT, synopsis: if r[P1]>r[P3] goto P2 */
#define OP_Le             39 /* same as TK_LE, synopsis: if r[P1]<=r[P3] goto P2 */
#define OP_Lt             40 /* same as TK_LT, synopsis: if r[P1]<r[P3] goto P2 */
#define OP_Ge             41 /* same as TK_GE, synopsis: if r[P1]>=r[P3] goto P2 */
#define OP_SorterSort     42
#define OP_BitAnd         43 /* same as TK_BITAND, synopsis: r[P3]=r[P1]&r[P2] */
#define OP_BitOr          44 /* same as TK_BITOR, synopsis: r[P3]=r[P1]|r[P2] */
#define OP_ShiftLeft      45 /* same as TK_LSHIFT, synopsis: r[P3]=r[P2]<<r[P1] */
#define OP_ShiftRight     46 /* same as TK_RSHIFT, synopsis: r[P3]=r[P2]>>r[P1] */
#define OP_Add            47 /* same as TK_PLUS, synopsis: r[P3]=r[P1]+r[P2] */
#define OP_Subtract       48 /* same as TK_MINUS, synopsis: r[P3]=r[P2]-r[P1] */
#define OP_Multiply       49 /* same as TK_STAR, synopsis: r[P3]=r[P1]*r[P2] */
#define OP_Divide         50 /* same as TK_SLASH, synopsis: r[P3]=r[P2]/r[P1] */
#define OP_Remainder      51 /* same as TK_REM, synopsis: r[P3]=r[P2]%r[P1] */
#define OP_Concat         52 /* same as TK_CONCAT, synopsis: r[P3]=r[P2]+r[P1] */
#define OP_Sort           53
#define OP_BitNot         54 /* same as TK_BITNOT, synopsis: r[P1]= ~r[P1] */
#define OP_Rewind         55
#define OP_IdxLE          56 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxGT          57 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxLT          58 /* synopsis: key=r[P3@P4]                     */
#define OP_IdxGE          59 /* synopsis: key=r[P3@P4]                     */
#define OP_RowSetRead     60 /* synopsis: r[P3]=rowset(P1)                 */
#define OP_RowSetTest     61 /* synopsis: if r[P3] in rowset(P1) goto P2   */
#define OP_Program        62
#define OP_FkIfZero       63 /* synopsis: if fkctr[P1]==0 goto P2          */
#define OP_IfPos          64 /* synopsis: if r[P1]>0 then r[P1]-=P3, goto P2 */
#define OP_IfNotZero      65 /* synopsis: if r[P1]!=0 then r[P1]-=P3, goto P2 */
#define OP_DecrJumpZero   66 /* synopsis: if (--r[P1])==0 goto P2          */
#define OP_IncrVacuum     67
#define OP_VNext          68
#define OP_Init           69 /* synopsis: Start at P2                      */
#define OP_Return         70
#define OP_EndCoroutine   71
#define OP_HaltIfNull     72 /* synopsis: if r[P3]=null halt               */
#define OP_Halt           73
#define OP_Integer        74 /* synopsis: r[P2]=P1                         */
#define OP_Int64          75 /* synopsis: r[P2]=P4                         */
#define OP_String         76 /* synopsis: r[P2]='P4' (len=P1)              */
#define OP_Null           77 /* synopsis: r[P2..P3]=NULL                   */
#define OP_SoftNull       78 /* synopsis: r[P1]=NULL                       */
#define OP_Blob           79 /* synopsis: r[P2]=P4 (len=P1)                */
#define OP_Variable       80 /* synopsis: r[P2]=parameter(P1,P4)           */
#define OP_Move           81 /* synopsis: r[P2@P3]=r[P1@P3]                */
#define OP_Copy           82 /* synopsis: r[P2@P3+1]=r[P1@P3+1]            */
#define OP_SCopy          83 /* synopsis: r[P2]=r[P1]                      */
#define OP_IntCopy        84 /* synopsis: r[P2]=r[P1]                      */
#define OP_ResultRow      85 /* synopsis: output=r[P1@P2]                  */
#define OP_CollSeq        86
#define OP_Function0      87 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_Function       88 /* synopsis: r[P3]=func(r[P2@P5])             */
#define OP_AddImm         89 /* synopsis: r[P1]=r[P1]+P2                   */
#define OP_RealAffinity   90
#define OP_Cast           91 /* synopsis: affinity(r[P1])                  */
#define OP_Permutation    92
#define OP_Compare        93 /* synopsis: r[P1@P3] <-> r[P2@P3]            */
#define OP_Column         94 /* synopsis: r[P3]=PX                         */
#define OP_Affinity       95 /* synopsis: affinity(r[P1@P2])               */
#define OP_MakeRecord     96 /* synopsis: r[P3]=mkrec(r[P1@P2])            */
#define OP_String8        97 /* same as TK_STRING, synopsis: r[P2]='P4'    */
#define OP_Count          98 /* synopsis: r[P2]=count()                    */
#define OP_ReadCookie     99
#define OP_SetCookie     100
#define OP_ReopenIdx     101 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenRead      102 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenWrite     103 /* synopsis: root=P2 iDb=P3                   */
#define OP_OpenAutoindex 104 /* synopsis: nColumn=P2                       */
#define OP_OpenEphemeral 105 /* synopsis: nColumn=P2                       */
#define OP_SorterOpen    106
#define OP_SequenceTest  107 /* synopsis: if( cursor[P1].ctr++ ) pc = P2   */
#define OP_OpenPseudo    108 /* synopsis: P3 columns in r[P2]              */
#define OP_Close         109
#define OP_ColumnsUsed   110
#define OP_Sequence      111 /* synopsis: r[P2]=cursor[P1].ctr++           */
#define OP_NewRowid      112 /* synopsis: r[P2]=rowid                      */
#define OP_Insert        113 /* synopsis: intkey=r[P3] data=r[P2]          */
#define OP_InsertInt     114 /* synopsis: intkey=P3 data=r[P2]             */
#define OP_Delete        115
#define OP_ResetCount    116
#define OP_SorterCompare 117 /* synopsis: if key(P1)!=trim(r[P3],P4) goto P2 */
#define OP_SorterData    118 /* synopsis: r[P2]=data                       */
#define OP_RowKey        119 /* synopsis: r[P2]=key                        */
#define OP_RowData       120 /* synopsis: r[P2]=data                       */
#define OP_Rowid         121 /* synopsis: r[P2]=rowid                      */
#define OP_NullRow       122
#define OP_SorterInsert  123
#define OP_IdxInsert     124 /* synopsis: key=r[P2]                        */
#define OP_IdxDelete     125 /* synopsis: key=r[P2@P3]                     */
#define OP_Seek          126 /* synopsis: Move P3 to P1.rowid              */
#define OP_IdxRowid      127 /* synopsis: r[P2]=rowid                      */
#define OP_Destroy       128
#define OP_Clear         129
#define OP_ResetSorter   130
#define OP_CreateIndex   131 /* synopsis: r[P2]=root iDb=P1                */
#define OP_CreateTable   132 /* synopsis: r[P2]=root iDb=P1                */
#define OP_Real          133 /* same as TK_FLOAT, synopsis: r[P2]=P4       */
#define OP_ParseSchema   134
#define OP_LoadAnalysis  135
#define OP_DropTable     136
#define OP_DropIndex     137
#define OP_DropTrigger   138
#define OP_IntegrityCk   139
#define OP_RowSetAdd     140 /* synopsis: rowset(P1)=r[P2]                 */
#define OP_Param         141
#define OP_FkCounter     142 /* synopsis: fkctr[P1]+=P2                    */
#define OP_MemMax        143 /* synopsis: r[P1]=max(r[P1],r[P2])           */
#define OP_OffsetLimit   144 /* synopsis: if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1) */
#define OP_AggStep0      145 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggStep       146 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggFinal      147 /* synopsis: accum=r[P1] N=P2                 */
#define OP_Expire        148
#define OP_TableLock     149 /* synopsis: iDb=P1 root=P2 write=P3          */
#define OP_VBegin        150
#define OP_VCreate       151
#define OP_VDestroy      152
#define OP_VOpen         153
#define OP_VColumn       154 /* synopsis: r[P3]=vcolumn(P2)                */
#define OP_VRename       155
#define OP_Pagecount     156
#define OP_MaxPgcnt      157
#define OP_CursorHint    158
#define OP_Noop          159
#define OP_Explain       160


/* Properties such as "out2" or "jump" that are specified in
** comments following the "case" for each opcode in the vdbe.c
** are encoded into bitvectors as follows:
*/
#define OPFLG_JUMP        0x01  /* jump:  P2 holds jmp target */
#define OPFLG_IN1         0x02  /* in1:   P1 is an input */
#define OPFLG_IN2         0x04  /* in2:   P2 is an input */
#define OPFLG_IN3         0x08  /* in3:   P3 is an input */
#define OPFLG_OUT2        0x10  /* out2:  P2 is an output */
#define OPFLG_OUT3        0x20  /* out3:  P3 is an output */
#define OPFLG_INITIALIZER {\
/*   0 */ 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,\
/*   8 */ 0x00, 0x10, 0x00, 0x01, 0x00, 0x01, 0x01, 0x01,\
/*  16 */ 0x03, 0x03, 0x01, 0x12, 0x01, 0x03, 0x03, 0x09,\
/*  24 */ 0x09, 0x09, 0x09, 0x26, 0x26, 0x09, 0x09, 0x09,\
/*  32 */ 0x09, 0x01, 0x03, 0x03, 0x0b, 0x0b, 0x0b, 0x0b,\
/*  40 */ 0x0b, 0x0b, 0x01, 0x26, 0x26, 0x26, 0x26, 0x26,\
/*  48 */ 0x26, 0x26, 0x26, 0x26, 0x26, 0x01, 0x12, 0x01,\
/*  56 */ 0x01, 0x01, 0x01, 0x01, 0x23, 0x0b, 0x01, 0x01,\
/*  64 */ 0x03, 0x03, 0x03, 0x01, 0x01, 0x01, 0x02, 0x02,\
/*  72 */ 0x08, 0x00, 0x10, 0x10, 0x10, 0x10, 0x00, 0x10,\
/*  80 */ 0x10, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00,\
/*  88 */ 0x00, 0x02, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00,\
/*  96 */ 0x00, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,\
/* 104 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,\

/* 112 */ 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 120 */ 0x00, 0x10, 0x00, 0x04, 0x04, 0x00, 0x00, 0x10,\
/* 128 */ 0x10, 0x00, 0x00, 0x10, 0x10, 0x10, 0x00, 0x00,\
/* 136 */ 0x00, 0x00, 0x00, 0x00, 0x06, 0x10, 0x00, 0x04,\
/* 144 */ 0x1a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 152 */ 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00,\
/* 160 */ 0x00,}

/* The sqlite3P2Values() routine is able to run faster if it knows
** the value of the largest JUMP opcode.  The smaller the maximum
** JUMP opcode the better, so the mkopcodeh.tcl script that
** generated this include file strives to group all JUMP opcodes
** together near the beginning of the list.
*/
#define SQLITE_MX_JUMP_OPCODE  69  /* Maximum JUMP opcode */

/************** End of opcodes.h *********************************************/
/************** Continuing where we left off in vdbe.h ***********************/

/*
** Prototypes for the VDBE interface.  See comments on the implementation
** for a description of what each of these routines does.
................................................................................
** Valid values for the second argument to sqlite3PagerLockingMode().
*/
#define PAGER_LOCKINGMODE_QUERY      -1
#define PAGER_LOCKINGMODE_NORMAL      0
#define PAGER_LOCKINGMODE_EXCLUSIVE   1

/*
** Numeric constants that encode the journalmode.
**
** The numeric values encoded here (other than PAGER_JOURNALMODE_QUERY)
** are exposed in the API via the "PRAGMA journal_mode" command and
** therefore cannot be changed without a compatibility break.
*/
#define PAGER_JOURNALMODE_QUERY     (-1)  /* Query the value of journalmode */
#define PAGER_JOURNALMODE_DELETE      0   /* Commit by deleting journal file */
#define PAGER_JOURNALMODE_PERSIST     1   /* Commit by zeroing journal header */
#define PAGER_JOURNALMODE_OFF         2   /* Journal omitted.  */
#define PAGER_JOURNALMODE_TRUNCATE    3   /* Commit by truncating journal */
#define PAGER_JOURNALMODE_MEMORY      4   /* In-memory journal file */
................................................................................
** Flags that make up the mask passed to sqlite3PagerGet().
*/
#define PAGER_GET_NOCONTENT     0x01  /* Do not load data from disk */
#define PAGER_GET_READONLY      0x02  /* Read-only page is acceptable */

/*
** Flags for sqlite3PagerSetFlags()
**
** Value constraints (enforced via assert()):
**    PAGER_FULLFSYNC      == SQLITE_FullFSync
**    PAGER_CKPT_FULLFSYNC == SQLITE_CkptFullFSync
**    PAGER_CACHE_SPILL    == SQLITE_CacheSpill
*/
#define PAGER_SYNCHRONOUS_OFF       0x01  /* PRAGMA synchronous=OFF */
#define PAGER_SYNCHRONOUS_NORMAL    0x02  /* PRAGMA synchronous=NORMAL */
#define PAGER_SYNCHRONOUS_FULL      0x03  /* PRAGMA synchronous=FULL */
#define PAGER_SYNCHRONOUS_EXTRA     0x04  /* PRAGMA synchronous=EXTRA */
#define PAGER_SYNCHRONOUS_MASK      0x07  /* Mask for four values above */
#define PAGER_FULLFSYNC             0x08  /* PRAGMA fullfsync=ON */
................................................................................
SQLITE_PRIVATE PgHdr *sqlite3PcacheFetchFinish(PCache*, Pgno, sqlite3_pcache_page *pPage);
SQLITE_PRIVATE void sqlite3PcacheRelease(PgHdr*);

SQLITE_PRIVATE void sqlite3PcacheDrop(PgHdr*);         /* Remove page from cache */
SQLITE_PRIVATE void sqlite3PcacheMakeDirty(PgHdr*);    /* Make sure page is marked dirty */
SQLITE_PRIVATE void sqlite3PcacheMakeClean(PgHdr*);    /* Mark a single page as clean */
SQLITE_PRIVATE void sqlite3PcacheCleanAll(PCache*);    /* Mark all dirty list pages as clean */
SQLITE_PRIVATE void sqlite3PcacheClearWritable(PCache*);

/* Change a page number.  Used by incr-vacuum. */
SQLITE_PRIVATE void sqlite3PcacheMove(PgHdr*, Pgno);

/* Remove all pages with pgno>x.  Reset the cache if x==0 */
SQLITE_PRIVATE void sqlite3PcacheTruncate(PCache*, Pgno x);

................................................................................
#endif

SQLITE_PRIVATE void sqlite3PCacheSetDefault(void);

/* Return the header size */
SQLITE_PRIVATE int sqlite3HeaderSizePcache(void);
SQLITE_PRIVATE int sqlite3HeaderSizePcache1(void);

/* Number of dirty pages as a percentage of the configured cache size */
SQLITE_PRIVATE int sqlite3PCachePercentDirty(PCache*);

#endif /* _PCACHE_H_ */

/************** End of pcache.h **********************************************/
/************** Continuing where we left off in sqliteInt.h ******************/
/************** Include os.h in the middle of sqliteInt.h ********************/
/************** Begin file os.h **********************************************/
................................................................................
** Wrapper around OS specific sqlite3_os_init() function.
*/
SQLITE_PRIVATE int sqlite3OsInit(void);

/* 
** Functions for accessing sqlite3_file methods 
*/
SQLITE_PRIVATE void sqlite3OsClose(sqlite3_file*);
SQLITE_PRIVATE int sqlite3OsRead(sqlite3_file*, void*, int amt, i64 offset);
SQLITE_PRIVATE int sqlite3OsWrite(sqlite3_file*, const void*, int amt, i64 offset);
SQLITE_PRIVATE int sqlite3OsTruncate(sqlite3_file*, i64 size);
SQLITE_PRIVATE int sqlite3OsSync(sqlite3_file*, int);
SQLITE_PRIVATE int sqlite3OsFileSize(sqlite3_file*, i64 *pSize);
SQLITE_PRIVATE int sqlite3OsLock(sqlite3_file*, int);
SQLITE_PRIVATE int sqlite3OsUnlock(sqlite3_file*, int);
................................................................................
SQLITE_PRIVATE int sqlite3OsCurrentTimeInt64(sqlite3_vfs *, sqlite3_int64*);

/*
** Convenience functions for opening and closing files using 
** sqlite3_malloc() to obtain space for the file-handle structure.
*/
SQLITE_PRIVATE int sqlite3OsOpenMalloc(sqlite3_vfs *, const char *, sqlite3_file **, int,int*);
SQLITE_PRIVATE void sqlite3OsCloseFree(sqlite3_file *);

#endif /* _SQLITE_OS_H_ */

/************** End of os.h **************************************************/
/************** Continuing where we left off in sqliteInt.h ******************/
/************** Include mutex.h in the middle of sqliteInt.h *****************/
/************** Begin file mutex.h *******************************************/
................................................................................
** A macro to discover the encoding of a database.
*/
#define SCHEMA_ENC(db) ((db)->aDb[0].pSchema->enc)
#define ENC(db)        ((db)->enc)

/*
** Possible values for the sqlite3.flags.
**
** Value constraints (enforced via assert()):
**      SQLITE_FullFSync     == PAGER_FULLFSYNC
**      SQLITE_CkptFullFSync == PAGER_CKPT_FULLFSYNC
**      SQLITE_CacheSpill    == PAGER_CACHE_SPILL
*/
#define SQLITE_VdbeTrace      0x00000001  /* True to trace VDBE execution */
#define SQLITE_InternChanges  0x00000002  /* Uncommitted Hash table changes */
#define SQLITE_FullColNames   0x00000004  /* Show full column names on SELECT */
#define SQLITE_FullFSync      0x00000008  /* Use full fsync on the backend */
#define SQLITE_CkptFullFSync  0x00000010  /* Use full fsync for checkpoint */
#define SQLITE_CacheSpill     0x00000020  /* OK to spill pager cache */
................................................................................
#define SQLITE_RecoveryMode   0x00010000  /* Ignore schema errors */
#define SQLITE_ReverseOrder   0x00020000  /* Reverse unordered SELECTs */
#define SQLITE_RecTriggers    0x00040000  /* Enable recursive triggers */
#define SQLITE_ForeignKeys    0x00080000  /* Enforce foreign key constraints  */
#define SQLITE_AutoIndex      0x00100000  /* Enable automatic indexes */
#define SQLITE_PreferBuiltin  0x00200000  /* Preference to built-in funcs */
#define SQLITE_LoadExtension  0x00400000  /* Enable load_extension */
#define SQLITE_LoadExtFunc    0x00800000  /* Enable load_extension() SQL func */
#define SQLITE_EnableTrigger  0x01000000  /* True to enable triggers */
#define SQLITE_DeferFKs       0x02000000  /* Defer all FK constraints */
#define SQLITE_QueryOnly      0x04000000  /* Disable database changes */
#define SQLITE_VdbeEQP        0x08000000  /* Debug EXPLAIN QUERY PLAN */
#define SQLITE_Vacuum         0x10000000  /* Currently in a VACUUM */
#define SQLITE_CellSizeCk     0x20000000  /* Check btree cell sizes on load */
#define SQLITE_Fts3Tokenizer  0x40000000  /* Enable fts3_tokenizer(2) */


/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/
................................................................................
};

/*
** Possible values for FuncDef.flags.  Note that the _LENGTH and _TYPEOF
** values must correspond to OPFLAG_LENGTHARG and OPFLAG_TYPEOFARG.  And
** SQLITE_FUNC_CONSTANT must be the same as SQLITE_DETERMINISTIC.  There
** are assert() statements in the code to verify this.
**
** Value constraints (enforced via assert()):
**     SQLITE_FUNC_MINMAX    ==  NC_MinMaxAgg      == SF_MinMaxAgg
**     SQLITE_FUNC_LENGTH    ==  OPFLAG_LENGTHARG
**     SQLITE_FUNC_TYPEOF    ==  OPFLAG_TYPEOFARG
**     SQLITE_FUNC_CONSTANT  ==  SQLITE_DETERMINISTIC from the API
**     SQLITE_FUNC_ENCMASK   depends on SQLITE_UTF* macros in the API
*/
#define SQLITE_FUNC_ENCMASK  0x0003 /* SQLITE_UTF8, SQLITE_UTF16BE or UTF16LE */
#define SQLITE_FUNC_LIKE     0x0004 /* Candidate for the LIKE optimization */
#define SQLITE_FUNC_CASE     0x0008 /* Case-sensitive LIKE-type function */
#define SQLITE_FUNC_EPHEM    0x0010 /* Ephemeral.  Delete with VDBE */
#define SQLITE_FUNC_NEEDCOLL 0x0020 /* sqlite3GetFuncCollSeq() might be called*/
#define SQLITE_FUNC_LENGTH   0x0040 /* Built-in length() function */
................................................................................
#define JT_OUTER     0x0020    /* The "OUTER" keyword is present */
#define JT_ERROR     0x0040    /* unknown or unsupported join type */


/*
** Flags appropriate for the wctrlFlags parameter of sqlite3WhereBegin()
** and the WhereInfo.wctrlFlags member.
**
** Value constraints (enforced via assert()):
**     WHERE_USE_LIMIT  == SF_FixedLimit
*/
#define WHERE_ORDERBY_NORMAL   0x0000 /* No-op */
#define WHERE_ORDERBY_MIN      0x0001 /* ORDER BY processing for min() func */
#define WHERE_ORDERBY_MAX      0x0002 /* ORDER BY processing for max() func */
#define WHERE_ONEPASS_DESIRED  0x0004 /* Want to do one-pass UPDATE/DELETE */
#define WHERE_DUPLICATES_OK    0x0008 /* Ok to return a row more than once */
#define WHERE_OMIT_OPEN_CLOSE  0x0010 /* Table cursors are already open */
................................................................................
  int nErr;            /* Number of errors encountered while resolving names */
  u16 ncFlags;         /* Zero or more NC_* flags defined below */
};

/*
** Allowed values for the NameContext, ncFlags field.
**
** Value constraints (all checked via assert()):
**    NC_HasAgg    == SF_HasAgg
**    NC_MinMaxAgg == SF_MinMaxAgg == SQLITE_FUNC_MINMAX
**
*/
#define NC_AllowAgg  0x0001  /* Aggregate functions are allowed here */
#define NC_PartIdx   0x0002  /* True if resolving a partial index WHERE */
#define NC_IsCheck   0x0004  /* True if resolving names in a CHECK constraint */
#define NC_InAggFunc 0x0008  /* True if analyzing arguments to an agg func */
#define NC_HasAgg    0x0010  /* One or more aggregate functions seen */
#define NC_IdxExpr   0x0020  /* True if resolving columns of CREATE INDEX */
#define NC_MinMaxAgg 0x1000  /* min/max aggregates seen.  See note above */

/*
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
**
................................................................................
  Expr *pOffset;         /* OFFSET expression. NULL means not used. */
  With *pWith;           /* WITH clause attached to this select. Or NULL. */
};

/*
** Allowed values for Select.selFlags.  The "SF" prefix stands for
** "Select Flag".
**
** Value constraints (all checked via assert())
**     SF_HasAgg     == NC_HasAgg
**     SF_MinMaxAgg  == NC_MinMaxAgg     == SQLITE_FUNC_MINMAX
**     SF_FixedLimit == WHERE_USE_LIMIT
*/
#define SF_Distinct       0x00001  /* Output should be DISTINCT */
#define SF_All            0x00002  /* Includes the ALL keyword */
#define SF_Resolved       0x00004  /* Identifiers have been resolved */
#define SF_Aggregate      0x00008  /* Contains agg functions or a GROUP BY */
#define SF_HasAgg         0x00010  /* Contains aggregate functions */
#define SF_UsesEphemeral  0x00020  /* Uses the OpenEphemeral opcode */
#define SF_Expanded       0x00040  /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo    0x00080  /* FROM subqueries have Table metadata */
#define SF_Compound       0x00100  /* Part of a compound query */
#define SF_Values         0x00200  /* Synthesized from VALUES clause */
#define SF_MultiValue     0x00400  /* Single VALUES term with multiple rows */
#define SF_NestedFrom     0x00800  /* Part of a parenthesized FROM clause */

#define SF_MinMaxAgg      0x01000  /* Aggregate containing min() or max() */
#define SF_Recursive      0x02000  /* The recursive part of a recursive CTE */
#define SF_FixedLimit     0x04000  /* nSelectRow set by a constant LIMIT */
#define SF_MaybeConvert   0x08000  /* Need convertCompoundSelectToSubquery() */
#define SF_Converted      0x10000  /* By convertCompoundSelectToSubquery() */
#define SF_IncludeHidden  0x20000  /* Include hidden columns in output */


/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
................................................................................
  u8 nested;           /* Number of nested calls to the parser/code generator */
  u8 nTempReg;         /* Number of temporary registers in aTempReg[] */
  u8 isMultiWrite;     /* True if statement may modify/insert multiple rows */
  u8 mayAbort;         /* True if statement may throw an ABORT exception */
  u8 hasCompound;      /* Need to invoke convertCompoundSelectToSubquery() */
  u8 okConstFactor;    /* OK to factor out constants */
  u8 disableLookaside; /* Number of times lookaside has been disabled */
  u8 nColCache;        /* Number of entries in aColCache[] */
  int aTempReg[8];     /* Holding area for temporary registers */
  int nRangeReg;       /* Size of the temporary register block */
  int iRangeReg;       /* First register in temporary register block */
  int nErr;            /* Number of errors seen */
  int nTab;            /* Number of previously allocated VDBE cursors */
  int nMem;            /* Number of memory cells used so far */
  int nSet;            /* Number of sets used so far */
................................................................................
struct AuthContext {
  const char *zAuthContext;   /* Put saved Parse.zAuthContext here */
  Parse *pParse;              /* The Parse structure */
};

/*
** Bitfield flags for P5 value in various opcodes.
**
** Value constraints (enforced via assert()):
**    OPFLAG_LENGTHARG    == SQLITE_FUNC_LENGTH
**    OPFLAG_TYPEOFARG    == SQLITE_FUNC_TYPEOF
**    OPFLAG_BULKCSR      == BTREE_BULKLOAD
**    OPFLAG_SEEKEQ       == BTREE_SEEK_EQ
**    OPFLAG_FORDELETE    == BTREE_FORDELETE
**    OPFLAG_SAVEPOSITION == BTREE_SAVEPOSITION
**    OPFLAG_AUXDELETE    == BTREE_AUXDELETE
*/
#define OPFLAG_NCHANGE       0x01    /* OP_Insert: Set to update db->nChange */
                                     /* Also used in P2 (not P5) of OP_Delete */
#define OPFLAG_EPHEM         0x01    /* OP_Column: Ephemeral output is ok */
#define OPFLAG_LASTROWID     0x02    /* Set to update db->lastRowid */
#define OPFLAG_ISUPDATE      0x04    /* This OP_Insert is an sql UPDATE */
#define OPFLAG_APPEND        0x08    /* This is likely to be an append */
................................................................................
# define sqlite3Toupper(x)  ((x)&~(sqlite3CtypeMap[(unsigned char)(x)]&0x20))
# define sqlite3Isspace(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x01)
# define sqlite3Isalnum(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x06)
# define sqlite3Isalpha(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x02)
# define sqlite3Isdigit(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x04)
# define sqlite3Isxdigit(x)  (sqlite3CtypeMap[(unsigned char)(x)]&0x08)
# define sqlite3Tolower(x)   (sqlite3UpperToLower[(unsigned char)(x)])
# define sqlite3Isquote(x)   (sqlite3CtypeMap[(unsigned char)(x)]&0x80)
#else
# define sqlite3Toupper(x)   toupper((unsigned char)(x))
# define sqlite3Isspace(x)   isspace((unsigned char)(x))
# define sqlite3Isalnum(x)   isalnum((unsigned char)(x))
# define sqlite3Isalpha(x)   isalpha((unsigned char)(x))
# define sqlite3Isdigit(x)   isdigit((unsigned char)(x))
# define sqlite3Isxdigit(x)  isxdigit((unsigned char)(x))
# define sqlite3Tolower(x)   tolower((unsigned char)(x))
# define sqlite3Isquote(x)   ((x)=='"'||(x)=='\''||(x)=='['||(x)=='`')
#endif
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
SQLITE_PRIVATE int sqlite3IsIdChar(u8);
#endif

/*
** Internal function prototypes
................................................................................
SQLITE_PRIVATE   void sqlite3TreeViewSelect(TreeView*, const Select*, u8);
SQLITE_PRIVATE   void sqlite3TreeViewWith(TreeView*, const With*, u8);
#endif


SQLITE_PRIVATE void sqlite3SetString(char **, sqlite3*, const char*);
SQLITE_PRIVATE void sqlite3ErrorMsg(Parse*, const char*, ...);
SQLITE_PRIVATE void sqlite3Dequote(char*);
SQLITE_PRIVATE void sqlite3TokenInit(Token*,char*);
SQLITE_PRIVATE int sqlite3KeywordCode(const unsigned char*, int);
SQLITE_PRIVATE int sqlite3RunParser(Parse*, const char*, char **);
SQLITE_PRIVATE void sqlite3FinishCoding(Parse*);
SQLITE_PRIVATE int sqlite3GetTempReg(Parse*);
SQLITE_PRIVATE void sqlite3ReleaseTempReg(Parse*,int);
SQLITE_PRIVATE int sqlite3GetTempRange(Parse*,int);
................................................................................
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3NoTempsInRange(Parse*,int,int);
#endif
SQLITE_PRIVATE Expr *sqlite3ExprAlloc(sqlite3*,int,const Token*,int);
SQLITE_PRIVATE Expr *sqlite3Expr(sqlite3*,int,const char*);
SQLITE_PRIVATE void sqlite3ExprAttachSubtrees(sqlite3*,Expr*,Expr*,Expr*);
SQLITE_PRIVATE Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*, const Token*);
SQLITE_PRIVATE void sqlite3PExprAddSelect(Parse*, Expr*, Select*);
SQLITE_PRIVATE Expr *sqlite3ExprAnd(sqlite3*,Expr*, Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*);
SQLITE_PRIVATE void sqlite3ExprAssignVarNumber(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3*, Expr*);
SQLITE_PRIVATE ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*);
SQLITE_PRIVATE void sqlite3ExprListSetSortOrder(ExprList*,int);
SQLITE_PRIVATE void sqlite3ExprListSetName(Parse*,ExprList*,Token*,int);
................................................................................
**   isspace()                        0x01
**   isalpha()                        0x02
**   isdigit()                        0x04
**   isalnum()                        0x06
**   isxdigit()                       0x08
**   toupper()                        0x20
**   SQLite identifier character      0x40
**   Quote character                  0x80
**
** Bit 0x20 is set if the mapped character requires translation to upper
** case. i.e. if the character is a lower-case ASCII character.
** If x is a lower-case ASCII character, then its upper-case equivalent
** is (x - 0x20). Therefore toupper() can be implemented as:
**
**   (x & ~(map[x]&0x20))
................................................................................
*/
#ifdef SQLITE_ASCII
SQLITE_PRIVATE const unsigned char sqlite3CtypeMap[256] = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 00..07    ........ */
  0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,  /* 08..0f    ........ */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 10..17    ........ */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 18..1f    ........ */
  0x01, 0x00, 0x80, 0x00, 0x40, 0x00, 0x00, 0x80,  /* 20..27     !"#$%&' */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 28..2f    ()*+,-./ */
  0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,  /* 30..37    01234567 */
  0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 38..3f    89:;<=>? */

  0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x02,  /* 40..47    @ABCDEFG */
  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 48..4f    HIJKLMNO */
  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 50..57    PQRSTUVW */
  0x02, 0x02, 0x02, 0x80, 0x00, 0x00, 0x00, 0x40,  /* 58..5f    XYZ[\]^_ */
  0x80, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x22,  /* 60..67    `abcdefg */
  0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 68..6f    hijklmno */
  0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 70..77    pqrstuvw */
  0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 78..7f    xyz{|}~. */

  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 80..87    ........ */
  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 88..8f    ........ */
  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 90..97    ........ */
................................................................................
/* #include "sqliteInt.h" */
/* #include <stdlib.h> */
/* #include <assert.h> */
#include <time.h>

#ifndef SQLITE_OMIT_DATETIME_FUNCS

/*
** The MSVC CRT on Windows CE may not have a localtime() function.
** So declare a substitute.  The substitute function itself is
** defined in "os_win.c".
*/
#if !defined(SQLITE_OMIT_LOCALTIME) && defined(_WIN32_WCE) && \
    (!defined(SQLITE_MSVC_LOCALTIME_API) || !SQLITE_MSVC_LOCALTIME_API)
struct tm *__cdecl localtime(const time_t *);
#endif

/*
** A structure for holding a single date and time.
*/
typedef struct DateTime DateTime;
struct DateTime {
  sqlite3_int64 iJD; /* The julian day number times 86400000 */
................................................................................
*/
static void clearYMD_HMS_TZ(DateTime *p){
  p->validYMD = 0;
  p->validHMS = 0;
  p->validTZ = 0;
}

#ifndef SQLITE_OMIT_LOCALTIME
/*
** On recent Windows platforms, the localtime_s() function is available
** as part of the "Secure CRT". It is essentially equivalent to 
** localtime_r() available under most POSIX platforms, except that the 
** order of the parameters is reversed.
**
** See http://msdn.microsoft.com/en-us/library/a442x3ye(VS.80).aspx.
................................................................................
*/
#if !HAVE_LOCALTIME_R && !HAVE_LOCALTIME_S \
    && defined(_MSC_VER) && defined(_CRT_INSECURE_DEPRECATE)
#undef  HAVE_LOCALTIME_S
#define HAVE_LOCALTIME_S 1
#endif


/*
** The following routine implements the rough equivalent of localtime_r()
** using whatever operating-system specific localtime facility that
** is available.  This routine returns 0 on success and
** non-zero on any kind of error.
**
** If the sqlite3GlobalConfig.bLocaltimeFault variable is true then this
................................................................................

/*
** The following routines are convenience wrappers around methods
** of the sqlite3_file object.  This is mostly just syntactic sugar. All
** of this would be completely automatic if SQLite were coded using
** C++ instead of plain old C.
*/
SQLITE_PRIVATE void sqlite3OsClose(sqlite3_file *pId){

  if( pId->pMethods ){
    pId->pMethods->xClose(pId);
    pId->pMethods = 0;
  }

}
SQLITE_PRIVATE int sqlite3OsRead(sqlite3_file *id, void *pBuf, int amt, i64 offset){
  DO_OS_MALLOC_TEST(id);
  return id->pMethods->xRead(id, pBuf, amt, offset);
}
SQLITE_PRIVATE int sqlite3OsWrite(sqlite3_file *id, const void *pBuf, int amt, i64 offset){
  DO_OS_MALLOC_TEST(id);
................................................................................
      *ppFile = pFile;
    }
  }else{
    rc = SQLITE_NOMEM_BKPT;
  }
  return rc;
}
SQLITE_PRIVATE void sqlite3OsCloseFree(sqlite3_file *pFile){

  assert( pFile );
  sqlite3OsClose(pFile);
  sqlite3_free(pFile);

}

/*
** This function is a wrapper around the OS specific implementation of
** sqlite3_os_init(). The purpose of the wrapper is to provide the
** ability to simulate a malloc failure, so that the handling of an
** error in sqlite3_os_init() by the upper layers can be tested.
................................................................................
** dequoted string, exclusive of the zero terminator, if dequoting does
** occur.
**
** 2002-Feb-14: This routine is extended to remove MS-Access style
** brackets from around identifiers.  For example:  "[a-b-c]" becomes
** "a-b-c".
*/
SQLITE_PRIVATE void sqlite3Dequote(char *z){
  char quote;
  int i, j;
  if( z==0 ) return;
  quote = z[0];
  if( !sqlite3Isquote(quote) ) return;
  if( quote=='[' ) quote = ']';





  for(i=1, j=0;; i++){
    assert( z[i] );
    if( z[i]==quote ){
      if( z[i+1]==quote ){
        z[j++] = quote;
        i++;
      }else{
................................................................................
        break;
      }
    }else{
      z[j++] = z[i];
    }
  }
  z[j] = 0;

}

/*
** Generate a Token object from a string
*/
SQLITE_PRIVATE void sqlite3TokenInit(Token *p, char *z){
  p->z = z;
................................................................................
  i64 s = 0;       /* significand */
  int d = 0;       /* adjust exponent for shifting decimal point */
  int esign = 1;   /* sign of exponent */
  int e = 0;       /* exponent */
  int eValid = 1;  /* True exponent is either not used or is well-formed */
  double result;
  int nDigits = 0;
  int nonNum = 0;  /* True if input contains UTF16 with high byte non-zero */

  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
  *pResult = 0.0;   /* Default return value, in case of an error */

  if( enc==SQLITE_UTF8 ){
    incr = 1;
  }else{
    int i;
    incr = 2;
    assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
    for(i=3-enc; i<length && z[i]==0; i+=2){}
    nonNum = i<length;
    zEnd = &z[i^1];
    z += (enc&1);
  }

  /* skip leading spaces */
  while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
  if( z>=zEnd ) return 0;

................................................................................
  if( *z=='-' ){
    sign = -1;
    z+=incr;
  }else if( *z=='+' ){
    z+=incr;
  }




  /* copy max significant digits to significand */
  while( z<zEnd && sqlite3Isdigit(*z) && s<((LARGEST_INT64-9)/10) ){
    s = s*10 + (*z - '0');
    z+=incr, nDigits++;
  }

  /* skip non-significant significand digits
................................................................................
  if( z>=zEnd ) goto do_atof_calc;

  /* if decimal point is present */
  if( *z=='.' ){
    z+=incr;
    /* copy digits from after decimal to significand
    ** (decrease exponent by d to shift decimal right) */
    while( z<zEnd && sqlite3Isdigit(*z) ){
      if( s<((LARGEST_INT64-9)/10) ){
        s = s*10 + (*z - '0');
        d--;
      }
      z+=incr, nDigits++;
    }


  }
  if( z>=zEnd ) goto do_atof_calc;

  /* if exponent is present */
  if( *z=='e' || *z=='E' ){
    z+=incr;
    eValid = 0;

    /* This branch is needed to avoid a (harmless) buffer overread.  The 
    ** special comment alerts the mutation tester that the correct answer
    ** is obtained even if the branch is omitted */
    if( z>=zEnd ) goto do_atof_calc;              /*PREVENTS-HARMLESS-OVERREAD*/

    /* get sign of exponent */
    if( *z=='-' ){
      esign = -1;
      z+=incr;
    }else if( *z=='+' ){
      z+=incr;
    }
................................................................................
      e = e<10000 ? (e*10 + (*z - '0')) : 10000;
      z+=incr;
      eValid = 1;
    }
  }

  /* skip trailing spaces */

  while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;


do_atof_calc:
  /* adjust exponent by d, and update sign */
  e = (e*esign) + d;
  if( e<0 ) {
    esign = -1;
    e *= -1;
  } else {
    esign = 1;
  }


  if( s==0 ) {
    /* In the IEEE 754 standard, zero is signed. */

    result = sign<0 ? -(double)0 : (double)0;
  } else {
    /* Attempt to reduce exponent.
    **
    ** Branches that are not required for the correct answer but which only
    ** help to obtain the correct answer faster are marked with special
    ** comments, as a hint to the mutation tester.
    */
    while( e>0 ){                                       /*OPTIMIZATION-IF-TRUE*/
      if( esign>0 ){

        if( s>=(LARGEST_INT64/10) ) break;             /*OPTIMIZATION-IF-FALSE*/
        s *= 10;
      }else{

        if( s%10!=0 ) break;                           /*OPTIMIZATION-IF-FALSE*/
        s /= 10;
      }
      e--;
    }

    /* adjust the sign of significand */
    s = sign<0 ? -s : s;

    if( e==0 ){                                         /*OPTIMIZATION-IF-TRUE*/
      result = (double)s;
    }else{
      LONGDOUBLE_TYPE scale = 1.0;
      /* attempt to handle extremely small/large numbers better */
      if( e>307 ){                                      /*OPTIMIZATION-IF-TRUE*/
        if( e<342 ){                                    /*OPTIMIZATION-IF-TRUE*/
          while( e%308 ) { scale *= 1.0e+1; e -= 1; }
          if( esign<0 ){
            result = s / scale;
            result /= 1.0e+308;
          }else{
            result = s * scale;
            result *= 1.0e+308;
          }
        }else{ assert( e>=342 );
          if( esign<0 ){
            result = 0.0*s;
          }else{
            result = 1e308*1e308*s;  /* Infinity */
          }
        }
      }else{
        /* 1.0e+22 is the largest power of 10 than can be 
        ** represented exactly. */
        while( e%22 ) { scale *= 1.0e+1; e -= 1; }
        while( e>0 ) { scale *= 1.0e+22; e -= 22; }
        if( esign<0 ){
          result = s / scale;
        }else{
          result = s * scale;
        }
      }


    }
  }

  /* store the result */
  *pResult = result;

  /* return true if number and no extra non-whitespace chracters after */
  return z==zEnd && nDigits>0 && eValid && nonNum==0;
#else
  return !sqlite3Atoi64(z, pResult, length, enc);
#endif /* SQLITE_OMIT_FLOATING_POINT */
}

/*
** Compare the 19-character string zNum against the text representation
................................................................................
*/
SQLITE_PRIVATE int sqlite3Atoi64(const char *zNum, i64 *pNum, int length, u8 enc){
  int incr;
  u64 u = 0;
  int neg = 0; /* assume positive */
  int i;
  int c = 0;
  int nonNum = 0;  /* True if input contains UTF16 with high byte non-zero */
  const char *zStart;
  const char *zEnd = zNum + length;
  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
  if( enc==SQLITE_UTF8 ){
    incr = 1;
  }else{
    incr = 2;
    assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
    for(i=3-enc; i<length && zNum[i]==0; i+=2){}
    nonNum = i<length;
    zEnd = &zNum[i^1];
    zNum += (enc&1);
  }
  while( zNum<zEnd && sqlite3Isspace(*zNum) ) zNum+=incr;
  if( zNum<zEnd ){
    if( *zNum=='-' ){
      neg = 1;
      zNum+=incr;
................................................................................
    *pNum = -(i64)u;
  }else{
    *pNum = (i64)u;
  }
  testcase( i==18 );
  testcase( i==19 );
  testcase( i==20 );
  if( &zNum[i]<zEnd              /* Extra bytes at the end */
   || (i==0 && zStart==zNum)     /* No digits */

   || i>19*incr                  /* Too many digits */
   || nonNum                     /* UTF16 with high-order bytes non-zero */
  ){
    /* zNum is empty or contains non-numeric text or is longer
    ** than 19 digits (thus guaranteeing that it is too large) */
    return 1;
  }else if( i<19*incr ){
    /* Less than 19 digits, so we know that it fits in 64 bits */
    assert( u<=LARGEST_INT64 );
    return 0;
................................................................................
**     1    Integer too large for a 64-bit signed integer or is malformed
**     2    Special case of 9223372036854775808
*/
SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char *z, i64 *pOut){
#ifndef SQLITE_OMIT_HEX_INTEGER
  if( z[0]=='0'
   && (z[1]=='x' || z[1]=='X')

  ){
    u64 u = 0;
    int i, k;
    for(i=2; z[i]=='0'; i++){}
    for(k=i; sqlite3Isxdigit(z[k]); k++){
      u = u*16 + sqlite3HexToInt(z[k]);
    }
................................................................................
SQLITE_PRIVATE LogEst sqlite3LogEst(u64 x){
  static LogEst a[] = { 0, 2, 3, 5, 6, 7, 8, 9 };
  LogEst y = 40;
  if( x<8 ){
    if( x<2 ) return 0;
    while( x<8 ){  y -= 10; x <<= 1; }
  }else{
    while( x>255 ){ y += 40; x >>= 4; }  /*OPTIMIZATION-IF-TRUE*/
    while( x>15 ){  y += 10; x >>= 1; }
  }
  return a[x&7] + y - 10;
}

#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
................................................................................

/*
** The hashing function.
*/
static unsigned int strHash(const char *z){
  unsigned int h = 0;
  unsigned char c;
  while( (c = (unsigned char)*z++)!=0 ){     /*OPTIMIZATION-IF-TRUE*/
    h = (h<<3) ^ h ^ sqlite3UpperToLower[c];
  }
  return h;
}


/* Link pNew element into the hash table pH.  If pEntry!=0 then also
................................................................................
  const char *pKey,   /* The key we are searching for */
  unsigned int *pHash /* Write the hash value here */
){
  HashElem *elem;                /* Used to loop thru the element list */
  int count;                     /* Number of elements left to test */
  unsigned int h;                /* The computed hash */

  if( pH->ht ){   /*OPTIMIZATION-IF-TRUE*/
    struct _ht *pEntry;
    h = strHash(pKey) % pH->htsize;
    pEntry = &pH->ht[h];
    elem = pEntry->chain;
    count = pEntry->count;
  }else{
    h = 0;
................................................................................
    /*   8 */ "Checkpoint"       OpHelp(""),
    /*   9 */ "JournalMode"      OpHelp(""),
    /*  10 */ "Vacuum"           OpHelp(""),
    /*  11 */ "VFilter"          OpHelp("iplan=r[P3] zplan='P4'"),
    /*  12 */ "VUpdate"          OpHelp("data=r[P3@P2]"),
    /*  13 */ "Goto"             OpHelp(""),
    /*  14 */ "Gosub"            OpHelp(""),
    /*  15 */ "InitCoroutine"    OpHelp(""),
    /*  16 */ "Yield"            OpHelp(""),
    /*  17 */ "MustBeInt"        OpHelp(""),
    /*  18 */ "Jump"             OpHelp(""),
    /*  19 */ "Not"              OpHelp("r[P2]= !r[P1]"),
    /*  20 */ "Once"             OpHelp(""),
    /*  21 */ "If"               OpHelp(""),
    /*  22 */ "IfNot"            OpHelp(""),
    /*  23 */ "SeekLT"           OpHelp("key=r[P3@P4]"),
    /*  24 */ "SeekLE"           OpHelp("key=r[P3@P4]"),
    /*  25 */ "SeekGE"           OpHelp("key=r[P3@P4]"),
    /*  26 */ "SeekGT"           OpHelp("key=r[P3@P4]"),
    /*  27 */ "Or"               OpHelp("r[P3]=(r[P1] || r[P2])"),
    /*  28 */ "And"              OpHelp("r[P3]=(r[P1] && r[P2])"),
    /*  29 */ "NoConflict"       OpHelp("key=r[P3@P4]"),
    /*  30 */ "NotFound"         OpHelp("key=r[P3@P4]"),
    /*  31 */ "Found"            OpHelp("key=r[P3@P4]"),
    /*  32 */ "NotExists"        OpHelp("intkey=r[P3]"),
    /*  33 */ "Last"             OpHelp(""),
    /*  34 */ "IsNull"           OpHelp("if r[P1]==NULL goto P2"),
    /*  35 */ "NotNull"          OpHelp("if r[P1]!=NULL goto P2"),
    /*  36 */ "Ne"               OpHelp("if r[P1]!=r[P3] goto P2"),
    /*  37 */ "Eq"               OpHelp("if r[P1]==r[P3] goto P2"),
    /*  38 */ "Gt"               OpHelp("if r[P1]>r[P3] goto P2"),
    /*  39 */ "Le"               OpHelp("if r[P1]<=r[P3] goto P2"),
    /*  40 */ "Lt"               OpHelp("if r[P1]<r[P3] goto P2"),
    /*  41 */ "Ge"               OpHelp("if r[P1]>=r[P3] goto P2"),
    /*  42 */ "SorterSort"       OpHelp(""),
    /*  43 */ "BitAnd"           OpHelp("r[P3]=r[P1]&r[P2]"),
    /*  44 */ "BitOr"            OpHelp("r[P3]=r[P1]|r[P2]"),
    /*  45 */ "ShiftLeft"        OpHelp("r[P3]=r[P2]<<r[P1]"),
    /*  46 */ "ShiftRight"       OpHelp("r[P3]=r[P2]>>r[P1]"),
    /*  47 */ "Add"              OpHelp("r[P3]=r[P1]+r[P2]"),
    /*  48 */ "Subtract"         OpHelp("r[P3]=r[P2]-r[P1]"),
    /*  49 */ "Multiply"         OpHelp("r[P3]=r[P1]*r[P2]"),
    /*  50 */ "Divide"           OpHelp("r[P3]=r[P2]/r[P1]"),
    /*  51 */ "Remainder"        OpHelp("r[P3]=r[P2]%r[P1]"),
    /*  52 */ "Concat"           OpHelp("r[P3]=r[P2]+r[P1]"),
    /*  53 */ "Sort"             OpHelp(""),
    /*  54 */ "BitNot"           OpHelp("r[P1]= ~r[P1]"),
    /*  55 */ "Rewind"           OpHelp(""),
    /*  56 */ "IdxLE"            OpHelp("key=r[P3@P4]"),
    /*  57 */ "IdxGT"            OpHelp("key=r[P3@P4]"),
    /*  58 */ "IdxLT"            OpHelp("key=r[P3@P4]"),
    /*  59 */ "IdxGE"            OpHelp("key=r[P3@P4]"),
    /*  60 */ "RowSetRead"       OpHelp("r[P3]=rowset(P1)"),
    /*  61 */ "RowSetTest"       OpHelp("if r[P3] in rowset(P1) goto P2"),
    /*  62 */ "Program"          OpHelp(""),
    /*  63 */ "FkIfZero"         OpHelp("if fkctr[P1]==0 goto P2"),
    /*  64 */ "IfPos"            OpHelp("if r[P1]>0 then r[P1]-=P3, goto P2"),
    /*  65 */ "IfNotZero"        OpHelp("if r[P1]!=0 then r[P1]-=P3, goto P2"),
    /*  66 */ "DecrJumpZero"     OpHelp("if (--r[P1])==0 goto P2"),
    /*  67 */ "IncrVacuum"       OpHelp(""),
    /*  68 */ "VNext"            OpHelp(""),
    /*  69 */ "Init"             OpHelp("Start at P2"),
    /*  70 */ "Return"           OpHelp(""),
    /*  71 */ "EndCoroutine"     OpHelp(""),
    /*  72 */ "HaltIfNull"       OpHelp("if r[P3]=null halt"),
    /*  73 */ "Halt"             OpHelp(""),
    /*  74 */ "Integer"          OpHelp("r[P2]=P1"),
    /*  75 */ "Int64"            OpHelp("r[P2]=P4"),
    /*  76 */ "String"           OpHelp("r[P2]='P4' (len=P1)"),
    /*  77 */ "Null"             OpHelp("r[P2..P3]=NULL"),
    /*  78 */ "SoftNull"         OpHelp("r[P1]=NULL"),
    /*  79 */ "Blob"             OpHelp("r[P2]=P4 (len=P1)"),
    /*  80 */ "Variable"         OpHelp("r[P2]=parameter(P1,P4)"),
    /*  81 */ "Move"             OpHelp("r[P2@P3]=r[P1@P3]"),
    /*  82 */ "Copy"             OpHelp("r[P2@P3+1]=r[P1@P3+1]"),
    /*  83 */ "SCopy"            OpHelp("r[P2]=r[P1]"),
    /*  84 */ "IntCopy"          OpHelp("r[P2]=r[P1]"),
    /*  85 */ "ResultRow"        OpHelp("output=r[P1@P2]"),
    /*  86 */ "CollSeq"          OpHelp(""),
    /*  87 */ "Function0"        OpHelp("r[P3]=func(r[P2@P5])"),
    /*  88 */ "Function"         OpHelp("r[P3]=func(r[P2@P5])"),
    /*  89 */ "AddImm"           OpHelp("r[P1]=r[P1]+P2"),
    /*  90 */ "RealAffinity"     OpHelp(""),
    /*  91 */ "Cast"             OpHelp("affinity(r[P1])"),
    /*  92 */ "Permutation"      OpHelp(""),
    /*  93 */ "Compare"          OpHelp("r[P1@P3] <-> r[P2@P3]"),
    /*  94 */ "Column"           OpHelp("r[P3]=PX"),
    /*  95 */ "Affinity"         OpHelp("affinity(r[P1@P2])"),
    /*  96 */ "MakeRecord"       OpHelp("r[P3]=mkrec(r[P1@P2])"),
    /*  97 */ "String8"          OpHelp("r[P2]='P4'"),
    /*  98 */ "Count"            OpHelp("r[P2]=count()"),
    /*  99 */ "ReadCookie"       OpHelp(""),
    /* 100 */ "SetCookie"        OpHelp(""),
    /* 101 */ "ReopenIdx"        OpHelp("root=P2 iDb=P3"),
    /* 102 */ "OpenRead"         OpHelp("root=P2 iDb=P3"),
    /* 103 */ "OpenWrite"        OpHelp("root=P2 iDb=P3"),
    /* 104 */ "OpenAutoindex"    OpHelp("nColumn=P2"),
    /* 105 */ "OpenEphemeral"    OpHelp("nColumn=P2"),
    /* 106 */ "SorterOpen"       OpHelp(""),
    /* 107 */ "SequenceTest"     OpHelp("if( cursor[P1].ctr++ ) pc = P2"),
    /* 108 */ "OpenPseudo"       OpHelp("P3 columns in r[P2]"),
    /* 109 */ "Close"            OpHelp(""),
    /* 110 */ "ColumnsUsed"      OpHelp(""),
    /* 111 */ "Sequence"         OpHelp("r[P2]=cursor[P1].ctr++"),
    /* 112 */ "NewRowid"         OpHelp("r[P2]=rowid"),
    /* 113 */ "Insert"           OpHelp("intkey=r[P3] data=r[P2]"),
    /* 114 */ "InsertInt"        OpHelp("intkey=P3 data=r[P2]"),
    /* 115 */ "Delete"           OpHelp(""),
    /* 116 */ "ResetCount"       OpHelp(""),
    /* 117 */ "SorterCompare"    OpHelp("if key(P1)!=trim(r[P3],P4) goto P2"),
    /* 118 */ "SorterData"       OpHelp("r[P2]=data"),
    /* 119 */ "RowKey"           OpHelp("r[P2]=key"),
    /* 120 */ "RowData"          OpHelp("r[P2]=data"),
    /* 121 */ "Rowid"            OpHelp("r[P2]=rowid"),
    /* 122 */ "NullRow"          OpHelp(""),
    /* 123 */ "SorterInsert"     OpHelp(""),
    /* 124 */ "IdxInsert"        OpHelp("key=r[P2]"),
    /* 125 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
    /* 126 */ "Seek"             OpHelp("Move P3 to P1.rowid"),
    /* 127 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
    /* 128 */ "Destroy"          OpHelp(""),
    /* 129 */ "Clear"            OpHelp(""),
    /* 130 */ "ResetSorter"      OpHelp(""),
    /* 131 */ "CreateIndex"      OpHelp("r[P2]=root iDb=P1"),
    /* 132 */ "CreateTable"      OpHelp("r[P2]=root iDb=P1"),
    /* 133 */ "Real"             OpHelp("r[P2]=P4"),
    /* 134 */ "ParseSchema"      OpHelp(""),
    /* 135 */ "LoadAnalysis"     OpHelp(""),
    /* 136 */ "DropTable"        OpHelp(""),
    /* 137 */ "DropIndex"        OpHelp(""),
    /* 138 */ "DropTrigger"      OpHelp(""),
    /* 139 */ "IntegrityCk"      OpHelp(""),
    /* 140 */ "RowSetAdd"        OpHelp("rowset(P1)=r[P2]"),
    /* 141 */ "Param"            OpHelp(""),
    /* 142 */ "FkCounter"        OpHelp("fkctr[P1]+=P2"),
    /* 143 */ "MemMax"           OpHelp("r[P1]=max(r[P1],r[P2])"),
    /* 144 */ "OffsetLimit"      OpHelp("if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1)"),
    /* 145 */ "AggStep0"         OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 146 */ "AggStep"          OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 147 */ "AggFinal"         OpHelp("accum=r[P1] N=P2"),
    /* 148 */ "Expire"           OpHelp(""),
    /* 149 */ "TableLock"        OpHelp("iDb=P1 root=P2 write=P3"),
    /* 150 */ "VBegin"           OpHelp(""),
    /* 151 */ "VCreate"          OpHelp(""),
    /* 152 */ "VDestroy"         OpHelp(""),
    /* 153 */ "VOpen"            OpHelp(""),
    /* 154 */ "VColumn"          OpHelp("r[P3]=vcolumn(P2)"),
    /* 155 */ "VRename"          OpHelp(""),
    /* 156 */ "Pagecount"        OpHelp(""),
    /* 157 */ "MaxPgcnt"         OpHelp(""),
    /* 158 */ "CursorHint"       OpHelp(""),
    /* 159 */ "Noop"             OpHelp(""),
    /* 160 */ "Explain"          OpHelp(""),

  };
  return azName[i];
}
#endif

/************** End of opcodes.c *********************************************/
/************** Begin file os_unix.c *****************************************/
................................................................................
#define osPread     ((ssize_t(*)(int,void*,size_t,off_t))aSyscall[9].pCurrent)

#if defined(USE_PREAD64)
  { "pread64",      (sqlite3_syscall_ptr)pread64,    0  },
#else
  { "pread64",      (sqlite3_syscall_ptr)0,          0  },
#endif
#define osPread64 ((ssize_t(*)(int,void*,size_t,off64_t))aSyscall[10].pCurrent)

  { "write",        (sqlite3_syscall_ptr)write,      0  },
#define osWrite     ((ssize_t(*)(int,const void*,size_t))aSyscall[11].pCurrent)

#if defined(USE_PREAD) || SQLITE_ENABLE_LOCKING_STYLE
  { "pwrite",       (sqlite3_syscall_ptr)pwrite,     0  },
#else
................................................................................
                    aSyscall[12].pCurrent)

#if defined(USE_PREAD64)
  { "pwrite64",     (sqlite3_syscall_ptr)pwrite64,   0  },
#else
  { "pwrite64",     (sqlite3_syscall_ptr)0,          0  },
#endif
#define osPwrite64  ((ssize_t(*)(int,const void*,size_t,off64_t))\
                    aSyscall[13].pCurrent)

  { "fchmod",       (sqlite3_syscall_ptr)fchmod,          0  },
#define osFchmod    ((int(*)(int,mode_t))aSyscall[14].pCurrent)

#if defined(HAVE_POSIX_FALLOCATE) && HAVE_POSIX_FALLOCATE
  { "fallocate",    (sqlite3_syscall_ptr)posix_fallocate,  0 },
................................................................................
#else
    sqlite3_snprintf(nShmFilename, zShmFilename, "%s-shm", zBasePath);
    sqlite3FileSuffix3(pDbFd->zPath, zShmFilename);
#endif
    pShmNode->h = -1;
    pDbFd->pInode->pShmNode = pShmNode;
    pShmNode->pInode = pDbFd->pInode;
    if( sqlite3GlobalConfig.bCoreMutex ){
      pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
      if( pShmNode->mutex==0 ){
        rc = SQLITE_NOMEM_BKPT;
        goto shm_open_err;
      }
    }

    if( pInode->bProcessLock==0 ){
      int openFlags = O_RDWR | O_CREAT;
      if( sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
        openFlags = O_RDONLY;
        pShmNode->isReadonly = 1;
................................................................................
     0,
     0,
     "/var/tmp",
     "/usr/tmp",
     "/tmp",
     "."
  };
  unsigned int i = 0;
  struct stat buf;
  const char *zDir = sqlite3_temp_directory;

  if( !azDirs[0] ) azDirs[0] = getenv("SQLITE_TMPDIR");
  if( !azDirs[1] ) azDirs[1] = getenv("TMPDIR");
  while(1){
    if( zDir!=0
     && osStat(zDir, &buf)==0
     && S_ISDIR(buf.st_mode)
     && osAccess(zDir, 03)==0

    ){
      return zDir;
    }
    if( i>=sizeof(azDirs)/sizeof(azDirs[0]) ) break;
    zDir = azDirs[i++];
  }
  return 0;
}

/*
** Create a temporary file name in zBuf.  zBuf must be allocated
** by the calling process and must be big enough to hold at least
** pVfs->mxPathname bytes.
*/
................................................................................
  const char *zDir;
  int iLimit = 0;

  /* It's odd to simulate an io-error here, but really this is just
  ** using the io-error infrastructure to test that SQLite handles this
  ** function failing. 
  */
  zBuf[0] = 0;
  SimulateIOError( return SQLITE_IOERR );

  zDir = unixTempFileDir();
  if( zDir==0 ) return SQLITE_IOERR_GETTEMPPATH;
  do{
    u64 r;
    sqlite3_randomness(sizeof(r), &r);
    assert( nBuf>2 );
    zBuf[nBuf-2] = 0;
    sqlite3_snprintf(nBuf, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX"%llx%c",
                     zDir, r, 0);
................................................................................
** the sqlite3_memory_used() function does not return zero, SQLITE_BUSY will
** be returned and no changes will be made to the Win32 native heap.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_win32_reset_heap(){
  int rc;
  MUTEX_LOGIC( sqlite3_mutex *pMaster; ) /* The main static mutex */
  MUTEX_LOGIC( sqlite3_mutex *pMem; )    /* The memsys static mutex */
  MUTEX_LOGIC( pMaster = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); )
  MUTEX_LOGIC( pMem = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM); )
  sqlite3_mutex_enter(pMaster);
  sqlite3_mutex_enter(pMem);
  winMemAssertMagic();
  if( winMemGetHeap()!=NULL && winMemGetOwned() && sqlite3_memory_used()==0 ){
    /*
    ** At this point, there should be no outstanding memory allocations on
    ** the heap.  Also, since both the master and memsys locks are currently
................................................................................
    sqlite3_log(SQLITE_NOTICE,
      "delayed %dms for lock/sharing conflict at line %d",
      winIoerrRetryDelay*nRetry*(nRetry+1)/2, lineno
    );
  }
}


/*
** This #if does not rely on the SQLITE_OS_WINCE define because the
** corresponding section in "date.c" cannot use it.
*/
#if !defined(SQLITE_OMIT_LOCALTIME) && defined(_WIN32_WCE) && \
    (!defined(SQLITE_MSVC_LOCALTIME_API) || !SQLITE_MSVC_LOCALTIME_API)
/*
** The MSVC CRT on Windows CE may not have a localtime() function.
** So define a substitute.
*/
/* #  include <time.h> */
struct tm *__cdecl localtime(const time_t *t)
{
  static struct tm y;
  FILETIME uTm, lTm;
  SYSTEMTIME pTm;
  sqlite3_int64 t64;
  t64 = *t;
................................................................................
  y.tm_hour = pTm.wHour;
  y.tm_min = pTm.wMinute;
  y.tm_sec = pTm.wSecond;
  return &y;
}
#endif

#if SQLITE_OS_WINCE
/*************************************************************************
** This section contains code for WinCE only.
*/
#define HANDLE_TO_WINFILE(a) (winFile*)&((char*)a)[-(int)offsetof(winFile,h)]

/*
** Acquire a lock on the handle h
*/
static void winceMutexAcquire(HANDLE h){
   DWORD dwErr;
................................................................................
  assert( locktype!=RESERVED_LOCK || pFile->locktype==SHARED_LOCK );

  /* Lock the PENDING_LOCK byte if we need to acquire a PENDING lock or
  ** a SHARED lock.  If we are acquiring a SHARED lock, the acquisition of
  ** the PENDING_LOCK byte is temporary.
  */
  newLocktype = pFile->locktype;
  if( pFile->locktype==NO_LOCK
   || (locktype==EXCLUSIVE_LOCK && pFile->locktype<=RESERVED_LOCK)

  ){
    int cnt = 3;
    while( cnt-->0 && (res = winLockFile(&pFile->h, SQLITE_LOCKFILE_FLAGS,
                                         PENDING_BYTE, 0, 1, 0))==0 ){
      /* Try 3 times to get the pending lock.  This is needed to work
      ** around problems caused by indexing and/or anti-virus software on
      ** Windows systems.
................................................................................
  }else{
    pShmNode = pNew;
    pNew = 0;
    ((winFile*)(&pShmNode->hFile))->h = INVALID_HANDLE_VALUE;
    pShmNode->pNext = winShmNodeList;
    winShmNodeList = pShmNode;

    if( sqlite3GlobalConfig.bCoreMutex ){
      pShmNode->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
      if( pShmNode->mutex==0 ){
        rc = SQLITE_IOERR_NOMEM_BKPT;
        goto shm_open_err;
      }
    }

    rc = winOpen(pDbFd->pVfs,
                 pShmNode->zFilename,             /* Name of the file (UTF-8) */
                 (sqlite3_file*)&pShmNode->hFile,  /* File handle here */
                 SQLITE_OPEN_WAL | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
                 0);
................................................................................
  assert( createFlag==0 || pCache->eCreate==eCreate );
  assert( createFlag==0 || eCreate==1+(!pCache->bPurgeable||!pCache->pDirty) );
  return sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, eCreate);
}

/*
** If the sqlite3PcacheFetch() routine is unable to allocate a new
** page because no clean pages are available for reuse and the cache
** size limit has been reached, then this routine can be invoked to 
** try harder to allocate a page.  This routine might invoke the stress
** callback to spill dirty pages to the journal.  It will then try to
** allocate the new page and will only fail to allocate a new page on
** an OOM error.
**
** This routine should be invoked only after sqlite3PcacheFetch() fails.
................................................................................
*/
SQLITE_PRIVATE void sqlite3PcacheCleanAll(PCache *pCache){
  PgHdr *p;
  while( (p = pCache->pDirty)!=0 ){
    sqlite3PcacheMakeClean(p);
  }
}

/*
** Clear the PGHDR_NEED_SYNC and PGHDR_WRITEABLE flag from all dirty pages.
*/
SQLITE_PRIVATE void sqlite3PcacheClearWritable(PCache *pCache){
  PgHdr *p;
  for(p=pCache->pDirty; p; p=p->pDirtyNext){
    p->flags &= ~(PGHDR_NEED_SYNC|PGHDR_WRITEABLE);
  }
  pCache->pSynced = pCache->pDirtyTail;
}

/*
** Clear the PGHDR_NEED_SYNC flag from all dirty pages.
*/
SQLITE_PRIVATE void sqlite3PcacheClearSyncFlags(PCache *pCache){
  PgHdr *p;
  for(p=pCache->pDirty; p; p=p->pDirtyNext){
................................................................................
    for(p=pCache->pDirty; p; p=pNext){
      pNext = p->pDirtyNext;
      /* This routine never gets call with a positive pgno except right
      ** after sqlite3PcacheCleanAll().  So if there are dirty pages,
      ** it must be that pgno==0.
      */
      assert( p->pgno>0 );
      if( p->pgno>pgno ){
        assert( p->flags&PGHDR_DIRTY );
        sqlite3PcacheMakeClean(p);
      }
    }
    if( pgno==0 && pCache->nRefSum ){
      sqlite3_pcache_page *pPage1;
      pPage1 = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache,1,0);
................................................................................

/*
** Return the size of the header added by this middleware layer
** in the page-cache hierarchy.
*/
SQLITE_PRIVATE int sqlite3HeaderSizePcache(void){ return ROUND8(sizeof(PgHdr)); }

/*
** Return the number of dirty pages currently in the cache, as a percentage
** of the configured cache size.
*/
SQLITE_PRIVATE int sqlite3PCachePercentDirty(PCache *pCache){
  PgHdr *pDirty;
  int nDirty = 0;
  int nCache = numberOfCachePages(pCache);
  for(pDirty=pCache->pDirty; pDirty; pDirty=pDirty->pDirtyNext) nDirty++;
  return nCache ? (int)(((i64)nDirty * 100) / nCache) : 0;
}

#if defined(SQLITE_CHECK_PAGES) || defined(SQLITE_DEBUG)
/*
** For all dirty pages currently in the cache, invoke the specified
** callback. This is only used if the SQLITE_CHECK_PAGES macro is
** defined.
*/
................................................................................
                          || sqlite3GlobalConfig.bCoreMutex>0;
#else
  pcache1.separateCache = sqlite3GlobalConfig.pPage==0;
#endif

#if SQLITE_THREADSAFE
  if( sqlite3GlobalConfig.bCoreMutex ){
    pcache1.grp.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_LRU);
    pcache1.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PMEM);
  }
#endif
  if( pcache1.separateCache
   && sqlite3GlobalConfig.nPage!=0
   && sqlite3GlobalConfig.pPage==0
  ){
    pcache1.nInitPage = sqlite3GlobalConfig.nPage;
................................................................................
** The cost of an INSERT is roughly constant.  (Sometimes new memory
** has to be allocated on an INSERT.)  The cost of a TEST with a new
** batch number is O(NlogN) where N is the number of elements in the RowSet.
** The cost of a TEST using the same batch number is O(logN).  The cost
** of the first SMALLEST is O(NlogN).  Second and subsequent SMALLEST
** primitives are constant time.  The cost of DESTROY is O(N).
**
** TEST and SMALLEST may not be used by the same RowSet.  This used to
** be possible, but the feature was not used, so it was removed in order
** to simplify the code.
*/
/* #include "sqliteInt.h" */


/*
** Target size for allocation chunks.
*/
................................................................................
** objected.
**
** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){  /*OPTIMIZATION-IF-FALSE*/
    /* We could allocate a fresh RowSetEntry each time one is needed, but it
    ** is more efficient to pull a preallocated entry from the pool */
    struct RowSetChunk *pNew;
    pNew = sqlite3DbMallocRawNN(p->db, sizeof(*pNew));
    if( pNew==0 ){
      return 0;
    }
    pNew->pNextChunk = p->pChunk;
    p->pChunk = pNew;
................................................................................

  pEntry = rowSetEntryAlloc(p);
  if( pEntry==0 ) return;
  pEntry->v = rowid;
  pEntry->pRight = 0;
  pLast = p->pLast;
  if( pLast ){
    if( rowid<=pLast->v ){  /*OPTIMIZATION-IF-FALSE*/
      /* Avoid unnecessary sorts by preserving the ROWSET_SORTED flags
      ** where possible */
      p->rsFlags &= ~ROWSET_SORTED;
    }
    pLast->pRight = pEntry;
  }else{
    p->pEntry = pEntry;
  }
  p->pLast = pEntry;
................................................................................
*/
static struct RowSetEntry *rowSetNDeepTree(
  struct RowSetEntry **ppList,
  int iDepth
){
  struct RowSetEntry *p;         /* Root of the new tree */
  struct RowSetEntry *pLeft;     /* Left subtree */
  if( *ppList==0 ){ /*OPTIMIZATION-IF-TRUE*/
    /* Prevent unnecessary deep recursion when we run out of entries */
    return 0; 
  }

  if( iDepth>1 ){   /*OPTIMIZATION-IF-TRUE*/
    /* This branch causes a *balanced* tree to be generated.  A valid tree
    ** is still generated without this branch, but the tree is wildly
    ** unbalanced and inefficient. */
    pLeft = rowSetNDeepTree(ppList, iDepth-1);
    p = *ppList;
    if( p==0 ){     /*OPTIMIZATION-IF-FALSE*/
      /* It is safe to always return here, but the resulting tree
      ** would be unbalanced */
      return pLeft;
    }
    p->pLeft = pLeft;
    *ppList = p->pRight;
    p->pRight = rowSetNDeepTree(ppList, iDepth-1);
  }else{
    p = *ppList;
    *ppList = p->pRight;
    p->pLeft = p->pRight = 0;

  }








  return p;
}

/*
** Convert a sorted list of elements into a binary tree. Make the tree
** as deep as it needs to be in order to contain the entire list.
*/
................................................................................
    pList = p->pRight;
    p->pLeft = pLeft;
    p->pRight = rowSetNDeepTree(&pList, iDepth);
  }
  return p;
}



































/*
** Extract the smallest element from the RowSet.
** Write the element into *pRowid.  Return 1 on success.  Return
** 0 if the RowSet is already empty.
**
** After this routine has been called, the sqlite3RowSetInsert()
** routine may not be called again.
**
** This routine may not be called after sqlite3RowSetTest() has
** been used.  Older versions of RowSet allowed that, but as the
** capability was not used by the code generator, it was removed
** for code economy.
*/
SQLITE_PRIVATE int sqlite3RowSetNext(RowSet *p, i64 *pRowid){
  assert( p!=0 );
  assert( p->pForest==0 );  /* Cannot be used with sqlite3RowSetText() */

  /* Merge the forest into a single sorted list on first call */
  if( (p->rsFlags & ROWSET_NEXT)==0 ){  /*OPTIMIZATION-IF-FALSE*/
    if( (p->rsFlags & ROWSET_SORTED)==0 ){  /*OPTIMIZATION-IF-FALSE*/
      p->pEntry = rowSetEntrySort(p->pEntry);
    }
    p->rsFlags |= ROWSET_SORTED|ROWSET_NEXT;
  }

  /* Return the next entry on the list */
  if( p->pEntry ){
    *pRowid = p->pEntry->v;
    p->pEntry = p->pEntry->pRight;
    if( p->pEntry==0 ){ /*OPTIMIZATION-IF-TRUE*/
      /* Free memory immediately, rather than waiting on sqlite3_finalize() */
      sqlite3RowSetClear(p);
    }
    return 1;
  }else{
    return 0;
  }
}
................................................................................
*/
SQLITE_PRIVATE int sqlite3RowSetTest(RowSet *pRowSet, int iBatch, sqlite3_int64 iRowid){
  struct RowSetEntry *p, *pTree;

  /* This routine is never called after sqlite3RowSetNext() */
  assert( pRowSet!=0 && (pRowSet->rsFlags & ROWSET_NEXT)==0 );

  /* Sort entries into the forest on the first test of a new batch.
  ** To save unnecessary work, only do this when the batch number changes.
  */
  if( iBatch!=pRowSet->iBatch ){  /*OPTIMIZATION-IF-FALSE*/
    p = pRowSet->pEntry;
    if( p ){
      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){ /*OPTIMIZATION-IF-FALSE*/
        /* Only sort the current set of entiries if they need it */
        p = rowSetEntrySort(p);
      }
      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
        ppPrevTree = &pTree->pRight;
        if( pTree->pLeft==0 ){
          pTree->pLeft = rowSetListToTree(p);
          break;
................................................................................
  ** either SQLITE_IOERR or SQLITE_FULL during rollback or while finalizing 
  ** a journal file. (although the in-memory journal implementation may 
  ** return SQLITE_IOERR_NOMEM while the journal file is being written). It 
  ** is therefore not possible for an in-memory pager to enter the ERROR 
  ** state.
  */
  if( MEMDB ){
    assert( !isOpen(p->fd) );
    assert( p->noSync );
    assert( p->journalMode==PAGER_JOURNALMODE_OFF 
         || p->journalMode==PAGER_JOURNALMODE_MEMORY 
    );
    assert( p->eState!=PAGER_ERROR && p->eState!=PAGER_OPEN );
    assert( pagerUseWal(p)==0 );
  }
................................................................................

    case PAGER_ERROR:
      /* There must be at least one outstanding reference to the pager if
      ** in ERROR state. Otherwise the pager should have already dropped
      ** back to OPEN state.
      */
      assert( pPager->errCode!=SQLITE_OK );
      assert( sqlite3PcacheRefCount(pPager->pPCache)>0 || pPager->tempFile );
      break;
  }

  return 1;
}
#endif /* ifndef NDEBUG */

................................................................................
    if( 0==(dc&(SQLITE_IOCAP_ATOMIC|(szPage>>8)) || nSector>szPage) ){
      return 0;
    }
  }

  return JOURNAL_HDR_SZ(pPager) + JOURNAL_PG_SZ(pPager);
}
#else
# define jrnlBufferSize(x) 0
#endif

/*
** If SQLITE_CHECK_PAGES is defined then we do some sanity checking
** on the cache using a hash function.  This is used for testing
** and debugging only.
*/
................................................................................
  }

  /* If Pager.errCode is set, the contents of the pager cache cannot be
  ** trusted. Now that there are no outstanding references to the pager,
  ** it can safely move back to PAGER_OPEN state. This happens in both
  ** normal and exclusive-locking mode.
  */
  assert( pPager->errCode==SQLITE_OK || !MEMDB );
  if( pPager->errCode ){

    if( pPager->tempFile==0 ){
      pager_reset(pPager);
      pPager->changeCountDone = 0;
      pPager->eState = PAGER_OPEN;

    }else{
      pPager->eState = (isOpen(pPager->jfd) ? PAGER_OPEN : PAGER_READER);
    }
    if( USEFETCH(pPager) ) sqlite3OsUnfetch(pPager->fd, 0, 0);
    pPager->errCode = SQLITE_OK;
  }

  pPager->journalOff = 0;
  pPager->journalHdr = 0;
  pPager->setMaster = 0;
}

................................................................................
    pPager->errCode = rc;
    pPager->eState = PAGER_ERROR;
  }
  return rc;
}

static int pager_truncate(Pager *pPager, Pgno nPage);

/*
** The write transaction open on the pager passed as the only argument is
** being committed. This function returns true if all dirty pages should
** be flushed to disk, or false otherwise. Pages should be flushed to disk
** unless one of the following is true:
**
**   * The db is an in-memory database.
**
**   * The db is a temporary database and the db file has not been opened.
**
**   * The db is a temporary database and the cache contains less than
**     C/4 dirty pages, where C is the configured cache-size.
*/
static int pagerFlushOnCommit(Pager *pPager){
  if( pPager->tempFile==0 ) return 1;
  if( !isOpen(pPager->fd) ) return 0;
  return (sqlite3PCachePercentDirty(pPager->pPCache)>=25);
}

/*
** This routine ends a transaction. A transaction is usually ended by 
** either a COMMIT or a ROLLBACK operation. This routine may be called 
** after rollback of a hot-journal, or if an error occurs while opening
** the journal file or writing the very first journal-header of a
** database transaction.
................................................................................
    }
  }
#endif

  sqlite3BitvecDestroy(pPager->pInJournal);
  pPager->pInJournal = 0;
  pPager->nRec = 0;
  if( MEMDB || pagerFlushOnCommit(pPager) ){
    sqlite3PcacheCleanAll(pPager->pPCache);
  }else{
    sqlite3PcacheClearWritable(pPager->pPCache);
  }
  sqlite3PcacheTruncate(pPager->pPCache, pPager->dbSize);

  if( pagerUseWal(pPager) ){
    /* Drop the WAL write-lock, if any. Also, if the connection was in 
    ** locking_mode=exclusive mode but is no longer, drop the EXCLUSIVE 
    ** lock held on the database file.
    */
................................................................................
  */
  if( pagerUseWal(pPager) ){
    pPg = 0;
  }else{
    pPg = sqlite3PagerLookup(pPager, pgno);
  }
  assert( pPg || !MEMDB );
  assert( pPager->eState!=PAGER_OPEN || pPg==0 || pPager->tempFile );
  PAGERTRACE(("PLAYBACK %d page %d hash(%08x) %s\n",
           PAGERID(pPager), pgno, pager_datahash(pPager->pageSize, (u8*)aData),
           (isMainJrnl?"main-journal":"sub-journal")
  ));
  if( isMainJrnl ){
    isSynced = pPager->noSync || (*pOffset <= pPager->journalHdr);
  }else{
................................................................................
      ** already in the journal file (recorded in Pager.pInJournal) and
      ** the PGHDR_NEED_SYNC flag is cleared, if the page is written to
      ** again within this transaction, it will be marked as dirty but
      ** the PGHDR_NEED_SYNC flag will not be set. It could then potentially
      ** be written out into the database file before its journal file
      ** segment is synced. If a crash occurs during or following this,
      ** database corruption may ensue.
      **
      ** Update: Another exception is for temp files that are not 
      ** in-memory databases. In this case the page may have been dirty
      ** at the start of the transaction.
      */
      assert( !pagerUseWal(pPager) );
      if( pPager->tempFile==0 ) sqlite3PcacheMakeClean(pPg);
    }
    pager_set_pagehash(pPg);

    /* If this was page 1, then restore the value of Pager.dbFileVers.
    ** Do this before any decoding. */
    if( pgno==1 ){
      memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
................................................................................
  ** function returns zero if the WAL is not open (i.e. Pager.pWal==0), or
  ** if the database size is not available. The database size is not
  ** available from the WAL sub-system if the log file is empty or
  ** contains no valid committed transactions.
  */
  assert( pPager->eState==PAGER_OPEN );
  assert( pPager->eLock>=SHARED_LOCK );
  assert( isOpen(pPager->fd) );
  assert( pPager->tempFile==0 );
  nPage = sqlite3WalDbsize(pPager->pWal);

  /* If the number of pages in the database is not available from the
  ** WAL sub-system, determine the page counte based on the size of
  ** the database file.  If the size of the database file is not an
  ** integer multiple of the page-size, round up the result.
  */
  if( nPage==0 && ALWAYS(isOpen(pPager->fd)) ){
    i64 n = 0;                    /* Size of db file in bytes */


    int rc = sqlite3OsFileSize(pPager->fd, &n);
    if( rc!=SQLITE_OK ){
      return rc;

    }
    nPage = (Pgno)((n+pPager->pageSize-1) / pPager->pageSize);
  }

  /* If the current number of pages in the file is greater than the
  ** configured maximum pager number, increase the allowed limit so
  ** that the file can be read.
................................................................................
** be obtained, SQLITE_BUSY is returned.
*/
static int pager_write_pagelist(Pager *pPager, PgHdr *pList){
  int rc = SQLITE_OK;                  /* Return code */

  /* This function is only called for rollback pagers in WRITER_DBMOD state. */
  assert( !pagerUseWal(pPager) );
  assert( pPager->tempFile || pPager->eState==PAGER_WRITER_DBMOD );
  assert( pPager->eLock==EXCLUSIVE_LOCK );
  assert( isOpen(pPager->fd) || pList->pDirty==0 );

  /* If the file is a temp-file has not yet been opened, open it now. It
  ** is not possible for rc to be other than SQLITE_OK if this branch
  ** is taken, as pager_wait_on_lock() is a no-op for temp-files.
  */
  if( !isOpen(pPager->fd) ){
    assert( pPager->tempFile && rc==SQLITE_OK );
................................................................................
    ** in fact there is none.  This results in a false-positive which will
    ** be dealt with by the playback routine.  Ticket #3883.
    */
    rc = sqlite3OsCheckReservedLock(pPager->fd, &locked);
    if( rc==SQLITE_OK && !locked ){
      Pgno nPage;                 /* Number of pages in database file */

      assert( pPager->tempFile==0 );
      rc = pagerPagecount(pPager, &nPage);
      if( rc==SQLITE_OK ){
        /* If the database is zero pages in size, that means that either (1) the
        ** journal is a remnant from a prior database with the same name where
        ** the database file but not the journal was deleted, or (2) the initial
        ** transaction that populates a new database is being rolled back.
        ** In either case, the journal file can be deleted.  However, take care
................................................................................
*/
SQLITE_PRIVATE int sqlite3PagerSharedLock(Pager *pPager){
  int rc = SQLITE_OK;                /* Return code */

  /* This routine is only called from b-tree and only when there are no
  ** outstanding pages. This implies that the pager state should either
  ** be OPEN or READER. READER is only possible if the pager is or was in 
  ** exclusive access mode.  */

  assert( sqlite3PcacheRefCount(pPager->pPCache)==0 );
  assert( assert_pager_state(pPager) );
  assert( pPager->eState==PAGER_OPEN || pPager->eState==PAGER_READER );
  assert( pPager->errCode==SQLITE_OK );

  if( !pagerUseWal(pPager) && pPager->eState==PAGER_OPEN ){
    int bHotJournal = 1;          /* True if there exists a hot journal-file */

    assert( !MEMDB );
    assert( pPager->tempFile==0 || pPager->eLock==EXCLUSIVE_LOCK );

    rc = pager_wait_on_lock(pPager, SHARED_LOCK);
    if( rc!=SQLITE_OK ){
      assert( pPager->eLock==NO_LOCK || pPager->eLock==UNKNOWN_LOCK );
      goto failed;
    }

................................................................................
      ** probably did not sync it and we are required to always sync
      ** the journal before playing it back.
      */
      if( isOpen(pPager->jfd) ){
        assert( rc==SQLITE_OK );
        rc = pagerSyncHotJournal(pPager);
        if( rc==SQLITE_OK ){
          rc = pager_playback(pPager, !pPager->tempFile);
          pPager->eState = PAGER_OPEN;
        }
      }else if( !pPager->exclusiveMode ){
        pagerUnlockDb(pPager, SHARED_LOCK);
      }

      if( rc!=SQLITE_OK ){
................................................................................
  }

  if( pagerUseWal(pPager) ){
    assert( rc==SQLITE_OK );
    rc = pagerBeginReadTransaction(pPager);
  }

  if( pPager->tempFile==0 && pPager->eState==PAGER_OPEN && rc==SQLITE_OK ){
    rc = pagerPagecount(pPager, &pPager->dbSize);
  }

 failed:
  if( rc!=SQLITE_OK ){
    assert( !MEMDB );
    pager_unlock(pPager);
................................................................................
      void *pData = 0;

      rc = sqlite3OsFetch(pPager->fd, 
          (i64)(pgno-1) * pPager->pageSize, pPager->pageSize, &pData
      );

      if( rc==SQLITE_OK && pData ){
        if( pPager->eState>PAGER_READER || pPager->tempFile ){
          pPg = sqlite3PagerLookup(pPager, pgno);
        }
        if( pPg==0 ){
          rc = pagerAcquireMapPage(pPager, pgno, pData, &pPg);
        }else{
          sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1)*pPager->pageSize, pData);
        }
................................................................................
    /* The maximum page number is 2^31. Return SQLITE_CORRUPT if a page
    ** number greater than this, or the unused locking-page, is requested. */
    if( pgno>PAGER_MAX_PGNO || pgno==PAGER_MJ_PGNO(pPager) ){
      rc = SQLITE_CORRUPT_BKPT;
      goto pager_acquire_err;
    }

    assert( !isOpen(pPager->fd) || !MEMDB );
    if( !isOpen(pPager->fd) || pPager->dbSize<pgno || noContent ){
      if( pgno>pPager->mxPgno ){
        rc = SQLITE_FULL;
        goto pager_acquire_err;
      }
      if( noContent ){
        /* Failure to set the bits in the InJournal bit-vectors is benign.
        ** It merely means that we might do some extra work to journal a 
................................................................................
    }
  
    /* Open the journal file if it is not already open. */
    if( !isOpen(pPager->jfd) ){
      if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ){
        sqlite3MemJournalOpen(pPager->jfd);
      }else{

        int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE;
        int nSpill;

        if( pPager->tempFile ){
          flags |= (SQLITE_OPEN_DELETEONCLOSE|SQLITE_OPEN_TEMP_JOURNAL);
          nSpill = sqlite3Config.nStmtSpill;
        }else{
          flags |= SQLITE_OPEN_MAIN_JOURNAL;

          nSpill = jrnlBufferSize(pPager);
        }
          
        /* Verify that the database still has the same name as it did when
        ** it was originally opened. */
        rc = databaseIsUnmoved(pPager);
        if( rc==SQLITE_OK ){

          rc = sqlite3JournalOpen (
              pVfs, pPager->zJournal, pPager->jfd, flags, nSpill
          );



        }
      }
      assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
    }
  
  
    /* Write the first journal header to the journal file and open 
................................................................................
  assert( assert_pager_state(pPager) );
  if( pPager->errCode ){
    return pPager->errCode;
  }else if( (pPg->flags & PGHDR_WRITEABLE)!=0 && pPager->dbSize>=pPg->pgno ){
    if( pPager->nSavepoint ) return subjournalPageIfRequired(pPg);
    return SQLITE_OK;
  }else if( pPager->sectorSize > (u32)pPager->pageSize ){
    assert( pPager->tempFile==0 );
    return pagerWriteLargeSector(pPg);
  }else{
    return pager_write(pPg);
  }
}

/*
................................................................................
       || pPager->eState==PAGER_WRITER_DBMOD
       || pPager->eState==PAGER_ERROR
  );
  assert( assert_pager_state(pPager) );

  /* If a prior error occurred, report that error again. */
  if( NEVER(pPager->errCode) ) return pPager->errCode;

  /* Provide the ability to easily simulate an I/O error during testing */
  if( (rc = sqlite3FaultSim(400))!=SQLITE_OK ) return rc;

  PAGERTRACE(("DATABASE SYNC: File=%s zMaster=%s nSize=%d\n", 
      pPager->zFilename, zMaster, pPager->dbSize));

  /* If no database changes have been made, return early. */
  if( pPager->eState<PAGER_WRITER_CACHEMOD ) return SQLITE_OK;

  assert( MEMDB==0 || pPager->tempFile );
  assert( isOpen(pPager->fd) || pPager->tempFile );
  if( 0==pagerFlushOnCommit(pPager) ){
    /* If this is an in-memory db, or no pages have been written to, or this
    ** function has already been called, it is mostly a no-op.  However, any
    ** backup in progress needs to be restarted.  */

    sqlite3BackupRestart(pPager->pBackup);
  }else{
    if( pagerUseWal(pPager) ){
      PgHdr *pList = sqlite3PcacheDirtyList(pPager->pPCache);
      PgHdr *pPageOne = 0;
      if( pList==0 ){
        /* Must have at least one page for the WAL commit flag.
................................................................................
  *pnVal += pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT];
  if( reset ){
    pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT] = 0;
  }
}

/*
** Return true if this is an in-memory or temp-file backed pager.
*/
SQLITE_PRIVATE int sqlite3PagerIsMemdb(Pager *pPager){
  return pPager->tempFile;
}

/*
** Check that there are at least nSavepoint savepoints open. If there are
** currently less than nSavepoints open, then open one or more savepoints
** to make up the difference. If the number of savepoints is already
** equal to nSavepoint, then this function is a no-op.
................................................................................
       || pPager->eState==PAGER_WRITER_DBMOD
  );
  assert( assert_pager_state(pPager) );

  /* In order to be able to rollback, an in-memory database must journal
  ** the page we are moving from.
  */
  if( pPager->tempFile ){
    rc = sqlite3PagerWrite(pPg);
    if( rc ) return rc;
  }

  /* If the page being moved is dirty and has not been saved by the latest
  ** savepoint, then save the current contents of the page into the 
  ** sub-journal now. This is required to handle the following scenario:
................................................................................
  ** for the page moved there.
  */
  pPg->flags &= ~PGHDR_NEED_SYNC;
  pPgOld = sqlite3PagerLookup(pPager, pgno);
  assert( !pPgOld || pPgOld->nRef==1 );
  if( pPgOld ){
    pPg->flags |= (pPgOld->flags&PGHDR_NEED_SYNC);
    if( pPager->tempFile ){
      /* Do not discard pages from an in-memory database since we might
      ** need to rollback later.  Just move the page out of the way. */
      sqlite3PcacheMove(pPgOld, pPager->dbSize+1);
    }else{
      sqlite3PcacheDrop(pPgOld);
    }
  }
................................................................................
  sqlite3PcacheMove(pPg, pgno);
  sqlite3PcacheMakeDirty(pPg);

  /* For an in-memory database, make sure the original page continues
  ** to exist, in case the transaction needs to roll back.  Use pPgOld
  ** as the original page since it has already been allocated.
  */
  if( pPager->tempFile ){
    assert( pPgOld );
    sqlite3PcacheMove(pPgOld, origPgno);
    sqlite3PagerUnrefNotNull(pPgOld);
  }

  if( needSyncPgno ){
    /* If needSyncPgno is non-zero, then the journal file needs to be 
................................................................................
}

#ifndef SQLITE_OMIT_VACUUM
/*
** Unless this is an in-memory or temporary database, clear the pager cache.
*/
SQLITE_PRIVATE void sqlite3PagerClearCache(Pager *pPager){
  assert( MEMDB==0 || pPager->tempFile );
  if( pPager->tempFile==0 ) pager_reset(pPager);
}
#endif

#ifndef SQLITE_OMIT_WAL
/*
** This function is called when the user invokes "PRAGMA wal_checkpoint",
** "PRAGMA wal_blocking_checkpoint" or calls the sqlite3_wal_checkpoint()
................................................................................
  if( rc==SQLITE_OK && pPager->pWal ){
    rc = pagerExclusiveLock(pPager);
    if( rc==SQLITE_OK ){
      rc = sqlite3WalClose(pPager->pWal, pPager->ckptSyncFlags,
                           pPager->pageSize, (u8*)pPager->pTmpSpace);
      pPager->pWal = 0;
      pagerFixMaplimit(pPager);
      if( rc && !pPager->exclusiveMode ) pagerUnlockDb(pPager, SHARED_LOCK);
    }
  }
  return rc;
}

#ifdef SQLITE_ENABLE_SNAPSHOT
/*
................................................................................
}

/* Try to open on pSnapshot when the next read-transaction starts
*/
SQLITE_PRIVATE void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot){
  pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
}

/* 
** Return a +ve value if snapshot p1 is newer than p2. A -ve value if
** p1 is older than p2 and zero if p1 and p2 are the same snapshot.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_snapshot_cmp(sqlite3_snapshot *p1, sqlite3_snapshot *p2){
  WalIndexHdr *pHdr1 = (WalIndexHdr*)p1;
  WalIndexHdr *pHdr2 = (WalIndexHdr*)p2;

  /* aSalt[0] is a copy of the value stored in the wal file header. It
  ** is incremented each time the wal file is restarted.  */
  if( pHdr1->aSalt[0]<pHdr2->aSalt[0] ) return -1;
  if( pHdr1->aSalt[0]>pHdr2->aSalt[0] ) return +1;
  if( pHdr1->mxFrame<pHdr2->mxFrame ) return -1;
  if( pHdr1->mxFrame>pHdr2->mxFrame ) return +1;
  return 0;
}
#endif /* SQLITE_ENABLE_SNAPSHOT */

#ifdef SQLITE_ENABLE_ZIPVFS
/*
** If the argument is not NULL, it points to a Wal object that holds a
** read-lock. This function returns the database page-size if it is known,
** or zero if it is not (or if pWal is NULL).
................................................................................
  assert( pCur->eState==CURSOR_VALID );
  assert( (flags & ~(BTREE_SAVEPOSITION | BTREE_AUXDELETE))==0 );

  iCellDepth = pCur->iPage;
  iCellIdx = pCur->aiIdx[iCellDepth];
  pPage = pCur->apPage[iCellDepth];
  pCell = findCell(pPage, iCellIdx);

  /* If the bPreserve flag is set to true, then the cursor position must
  ** be preserved following this delete operation. If the current delete
  ** will cause a b-tree rebalance, then this is done by saving the cursor
  ** key and leaving the cursor in CURSOR_REQUIRESEEK state before 
  ** returning. 
  **
  ** Or, if the current delete will not cause a rebalance, then the cursor
  ** will be left in CURSOR_SKIPNEXT state pointing to the entry immediately
  ** before or after the deleted entry. In this case set bSkipnext to true.  */
  if( bPreserve ){
    if( !pPage->leaf 
     || (pPage->nFree+cellSizePtr(pPage,pCell)+2)>(int)(pBt->usableSize*2/3)
    ){
      /* A b-tree rebalance will be required after deleting this entry.
      ** Save the cursor key.  */
      rc = saveCursorKey(pCur);
      if( rc ) return rc;
    }else{
      bSkipnext = 1;
    }
  }

  /* If the page containing the entry to delete is not a leaf page, move
  ** the cursor to the largest entry in the tree that is smaller than
  ** the entry being deleted. This cell will replace the cell being deleted
  ** from the internal node. The 'previous' entry is used for this instead
  ** of the 'next' entry, as the previous entry is always a part of the
  ** sub-tree headed by the child page of the cell being deleted. This makes
................................................................................

  /* If this is a delete operation to remove a row from a table b-tree,
  ** invalidate any incrblob cursors open on the row being deleted.  */
  if( pCur->pKeyInfo==0 ){
    invalidateIncrblobCursors(p, pCur->info.nKey, 0);
  }























  /* Make the page containing the entry to be deleted writable. Then free any
  ** overflow pages associated with the entry and finally remove the cell
  ** itself from within the page.  */
  rc = sqlite3PagerWrite(pPage->pDbPage);
  if( rc ) return rc;
  rc = clearCell(pPage, pCell, &szCell);
  dropCell(pPage, iCellIdx, szCell, &rc);
................................................................................
**
** (3) Update the Vdbe.readOnly and Vdbe.bIsReader flags to accurately
**     indicate what the prepared statement actually does.
**
** (4) Initialize the p4.xAdvance pointer on opcodes that use it.
**
** (5) Reclaim the memory allocated for storing labels.
**
** This routine will only function correctly if the mkopcodeh.tcl generator
** script numbers the opcodes correctly.  Changes to this routine must be
** coordinated with changes to mkopcodeh.tcl.
*/
static void resolveP2Values(Vdbe *p, int *pMaxFuncArgs){

  int nMaxArgs = *pMaxFuncArgs;
  Op *pOp;
  Parse *pParse = p->pParse;
  int *aLabel = pParse->aLabel;
  p->readOnly = 1;
  p->bIsReader = 0;


  pOp = &p->aOp[p->nOp-1];
  while(1){

    /* Only JUMP opcodes and the short list of special opcodes in the switch
    ** below need to be considered.  The mkopcodeh.tcl generator script groups
    ** all these opcodes together near the front of the opcode list.  Skip
    ** any opcode that does not need processing by virtual of the fact that
    ** it is larger than SQLITE_MX_JUMP_OPCODE, as a performance optimization.
    */
    if( pOp->opcode<=SQLITE_MX_JUMP_OPCODE ){
      /* NOTE: Be sure to update mkopcodeh.tcl when adding or removing
      ** cases from this switch! */
      switch( pOp->opcode ){
        case OP_Transaction: {
          if( pOp->p2!=0 ) p->readOnly = 0;
          /* fall thru */
        }
        case OP_AutoCommit:
        case OP_Savepoint: {
          p->bIsReader = 1;
          break;
        }
#ifndef SQLITE_OMIT_WAL
        case OP_Checkpoint:
#endif
        case OP_Vacuum:
        case OP_JournalMode: {
          p->readOnly = 0;
          p->bIsReader = 1;
          break;
        }
#ifndef SQLITE_OMIT_VIRTUALTABLE
        case OP_VUpdate: {
          if( pOp->p2>nMaxArgs ) nMaxArgs = pOp->p2;
          break;
        }
        case OP_VFilter: {
          int n;

          assert( (pOp - p->aOp) >= 3 );
          assert( pOp[-1].opcode==OP_Integer );
          n = pOp[-1].p1;
          if( n>nMaxArgs ) nMaxArgs = n;
          break;
        }
#endif
        case OP_Next:
        case OP_NextIfOpen:
        case OP_SorterNext: {
          pOp->p4.xAdvance = sqlite3BtreeNext;
          pOp->p4type = P4_ADVANCE;
          break;
        }
        case OP_Prev:
        case OP_PrevIfOpen: {
          pOp->p4.xAdvance = sqlite3BtreePrevious;
          pOp->p4type = P4_ADVANCE;
          break;
        }
      }


      if( (sqlite3OpcodeProperty[pOp->opcode] & OPFLG_JUMP)!=0 && pOp->p2<0 ){
        assert( ADDR(pOp->p2)<pParse->nLabel );
        pOp->p2 = aLabel[ADDR(pOp->p2)];
      }
    }
    if( pOp==p->aOp ) break;
    pOp--;
  }
  sqlite3DbFree(p->db, pParse->aLabel);
  pParse->aLabel = 0;
  pParse->nLabel = 0;
  *pMaxFuncArgs = nMaxArgs;
  assert( p->bIsReader!=0 || DbMaskAllZero(p->btreeMask) );
}
................................................................................
  int nByte;
  VdbeCursor *pCx = 0;
  nByte = 
      ROUND8(sizeof(VdbeCursor)) + 2*sizeof(u32)*nField + 
      (eCurType==CURTYPE_BTREE?sqlite3BtreeCursorSize():0);

  assert( iCur>=0 && iCur<p->nCursor );
  if( p->apCsr[iCur] ){ /*OPTIMIZATION-IF-FALSE*/
    sqlite3VdbeFreeCursor(p, p->apCsr[iCur]);
    p->apCsr[iCur] = 0;
  }
  if( SQLITE_OK==sqlite3VdbeMemClearAndResize(pMem, nByte) ){
    p->apCsr[iCur] = pCx = (VdbeCursor*)pMem->z;
    memset(pCx, 0, sizeof(VdbeCursor));
    pCx->eCurType = eCurType;
................................................................................
  Mem *pRec,          /* The value to apply affinity to */
  char affinity,      /* The affinity to be applied */
  u8 enc              /* Use this text encoding */
){
  if( affinity>=SQLITE_AFF_NUMERIC ){
    assert( affinity==SQLITE_AFF_INTEGER || affinity==SQLITE_AFF_REAL
             || affinity==SQLITE_AFF_NUMERIC );
    if( (pRec->flags & MEM_Int)==0 ){ /*OPTIMIZATION-IF-FALSE*/
      if( (pRec->flags & MEM_Real)==0 ){
        if( pRec->flags & MEM_Str ) applyNumericAffinity(pRec,1);
      }else{
        sqlite3VdbeIntegerAffinity(pRec);
      }
    }
  }else if( affinity==SQLITE_AFF_TEXT ){
    /* Only attempt the conversion to TEXT if there is an integer or real
    ** representation (blob and NULL do not get converted) but no string
    ** representation.  It would be harmless to repeat the conversion if 
    ** there is already a string rep, but it is pointless to waste those
    ** CPU cycles. */
    if( 0==(pRec->flags&MEM_Str) ){ /*OPTIMIZATION-IF-FALSE*/
      if( (pRec->flags&(MEM_Real|MEM_Int)) ){
        sqlite3VdbeMemStringify(pRec, enc, 1);
      }
    }
    pRec->flags &= ~(MEM_Real|MEM_Int);
  }
}

/*
** Try to convert the type of a function argument or a result column
................................................................................
}
static Mem *out2Prerelease(Vdbe *p, VdbeOp *pOp){
  Mem *pOut;
  assert( pOp->p2>0 );
  assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
  pOut = &p->aMem[pOp->p2];
  memAboutToChange(p, pOut);
  if( VdbeMemDynamic(pOut) ){ /*OPTIMIZATION-IF-FALSE*/
    return out2PrereleaseWithClear(pOut);
  }else{
    pOut->flags = MEM_Int;
    return pOut;
  }
}

................................................................................
        sqlite3_interrupt(db);
      }
    }
#endif

    /* Sanity checking on other operands */
#ifdef SQLITE_DEBUG
    {
      u8 opProperty = sqlite3OpcodeProperty[pOp->opcode];
      if( (opProperty & OPFLG_IN1)!=0 ){
        assert( pOp->p1>0 );
        assert( pOp->p1<=(p->nMem+1 - p->nCursor) );
        assert( memIsValid(&aMem[pOp->p1]) );
        assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p1]) );
        REGISTER_TRACE(pOp->p1, &aMem[pOp->p1]);
      }
      if( (opProperty & OPFLG_IN2)!=0 ){
        assert( pOp->p2>0 );
        assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
        assert( memIsValid(&aMem[pOp->p2]) );
        assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p2]) );
        REGISTER_TRACE(pOp->p2, &aMem[pOp->p2]);
      }
      if( (opProperty & OPFLG_IN3)!=0 ){
        assert( pOp->p3>0 );
        assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
        assert( memIsValid(&aMem[pOp->p3]) );
        assert( sqlite3VdbeCheckMemInvariants(&aMem[pOp->p3]) );
        REGISTER_TRACE(pOp->p3, &aMem[pOp->p3]);
      }
      if( (opProperty & OPFLG_OUT2)!=0 ){
        assert( pOp->p2>0 );
        assert( pOp->p2<=(p->nMem+1 - p->nCursor) );
        memAboutToChange(p, &aMem[pOp->p2]);
      }
      if( (opProperty & OPFLG_OUT3)!=0 ){
        assert( pOp->p3>0 );
        assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
        memAboutToChange(p, &aMem[pOp->p3]);
      }
    }
#endif
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
    pOrigOp = pOp;
#endif
  
    switch( pOp->opcode ){
................................................................................
** omitted.
**
** There is an implied "Halt 0 0 0" instruction inserted at the very end of
** every program.  So a jump past the last instruction of the program
** is the same as executing Halt.
*/
case OP_Halt: {


  VdbeFrame *pFrame;
  int pcx;

  pcx = (int)(pOp - aOp);
  if( pOp->p1==SQLITE_OK && p->pFrame ){
    /* Halt the sub-program. Return control to the parent frame. */
    pFrame = p->pFrame;
................................................................................
    aMem = p->aMem;
    pOp = &aOp[pcx];
    break;
  }
  p->rc = pOp->p1;
  p->errorAction = (u8)pOp->p2;
  p->pc = pcx;
  assert( pOp->p5>=0 && pOp->p5<=4 );
  if( p->rc ){
    if( pOp->p5 ){
      static const char * const azType[] = { "NOT NULL", "UNIQUE", "CHECK",
                                             "FOREIGN KEY" };

      testcase( pOp->p5==1 );
      testcase( pOp->p5==2 );
      testcase( pOp->p5==3 );
      testcase( pOp->p5==4 );







      sqlite3VdbeError(p, "%s constraint failed", azType[pOp->p5-1]);
      if( pOp->p4.z ){

        p->zErrMsg = sqlite3MPrintf(db, "%z: %s", p->zErrMsg, pOp->p4.z);
      }
    }else{
      sqlite3VdbeError(p, "%s", pOp->p4.z);
    }
    sqlite3_log(pOp->p1, "abort at %d in [%s]: %s", pcx, p->zSql, p->zErrMsg);
  }
  rc = sqlite3VdbeHalt(p);
  assert( rc==SQLITE_BUSY || rc==SQLITE_OK || rc==SQLITE_ERROR );
  if( rc==SQLITE_BUSY ){
    p->rc = SQLITE_BUSY;
  }else{
    assert( rc==SQLITE_OK || (p->rc&0xff)==SQLITE_CONSTRAINT );
    assert( rc==SQLITE_OK || db->nDeferredCons>0 || db->nDeferredImmCons>0 );
    rc = p->rc ? SQLITE_ERROR : SQLITE_DONE;
  }
  goto vdbe_return;
}
................................................................................
  pOut = out2Prerelease(p, pOp);
  pOp->opcode = OP_String;
  pOp->p1 = sqlite3Strlen30(pOp->p4.z);

#ifndef SQLITE_OMIT_UTF16
  if( encoding!=SQLITE_UTF8 ){
    rc = sqlite3VdbeMemSetStr(pOut, pOp->p4.z, -1, SQLITE_UTF8, SQLITE_STATIC);
    assert( rc==SQLITE_OK || rc==SQLITE_TOOBIG );



    if( SQLITE_OK!=sqlite3VdbeChangeEncoding(pOut, encoding) ) goto no_mem;
    assert( pOut->szMalloc>0 && pOut->zMalloc==pOut->z );
    assert( VdbeMemDynamic(pOut)==0 );
    pOut->szMalloc = 0;
    pOut->flags |= MEM_Static;
    if( pOp->p4type==P4_DYNAMIC ){
      sqlite3DbFree(db, pOp->p4.z);
    }
    pOp->p4type = P4_DYNAMIC;
    pOp->p4.z = pOut->z;
    pOp->p1 = pOut->n;
  }
  testcase( rc==SQLITE_TOOBIG );
#endif
  if( pOp->p1>db->aLimit[SQLITE_LIMIT_LENGTH] ){
    goto too_big;
  }
  assert( rc==SQLITE_OK );
  /* Fall through to the next case, OP_String */
}
  
/* Opcode: String P1 P2 P3 P4 P5
** Synopsis: r[P2]='P4' (len=P1)
**
** The string value P4 of length P1 (bytes) is stored in register P2.
**
** If P3 is not zero and the content of register P3 is equal to P5, then
** the datatype of the register P2 is converted to BLOB.  The content is
** the same sequence of bytes, it is merely interpreted as a BLOB instead
** of a string, as if it had been CAST.  In other words:
**
** if( P3!=0 and reg[P3]==P5 ) reg[P2] := CAST(reg[P2] as BLOB)
*/
case OP_String: {          /* out2 */
  assert( pOp->p4.z!=0 );
  pOut = out2Prerelease(p, pOp);
  pOut->flags = MEM_Str|MEM_Static|MEM_Term;
  pOut->z = pOp->p4.z;
  pOut->n = pOp->p1;
  pOut->enc = encoding;
  UPDATE_MAX_BLOBSIZE(pOut);
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS

  if( pOp->p3>0 ){
    assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
    pIn3 = &aMem[pOp->p3];
    assert( pIn3->flags & MEM_Int );
    if( pIn3->u.i==pOp->p5 ) pOut->flags = MEM_Blob|MEM_Static|MEM_Term;
  }
#endif
  break;
}

/* Opcode: Null P1 P2 P3 * *
** Synopsis:  r[P2..P3]=NULL
................................................................................
  pIn1->u.i--;
  VdbeBranchTaken(pIn1->u.i==0, 2);
  if( pIn1->u.i==0 ) goto jump_to_p2;
  break;
}

















/* Opcode: AggStep0 * P2 P3 P4 P5
** Synopsis: accum=r[P3] step(r[P2@P5])
**
** Execute the step function for an aggregate.  The
** function has P5 arguments.   P4 is a pointer to the FuncDef
** structure that specifies the function.  Register P3 is the
** accumulator.
................................................................................
    ** the evaluator loop.  So we can leave it out when NDEBUG is defined.
    */
#ifndef NDEBUG
    assert( pOp>=&aOp[-1] && pOp<&aOp[p->nOp-1] );

#ifdef SQLITE_DEBUG
    if( db->flags & SQLITE_VdbeTrace ){
      u8 opProperty = sqlite3OpcodeProperty[pOrigOp->opcode];
      if( rc!=0 ) printf("rc=%d\n",rc);
      if( opProperty & (OPFLG_OUT2) ){
        registerTrace(pOrigOp->p2, &aMem[pOrigOp->p2]);
      }
      if( opProperty & OPFLG_OUT3 ){
        registerTrace(pOrigOp->p3, &aMem[pOrigOp->p3]);
      }
    }
#endif  /* SQLITE_DEBUG */
#endif  /* NDEBUG */
  }  /* The end of the for(;;) loop the loops through opcodes */

................................................................................
SQLITE_PRIVATE int sqlite3VdbeSorterInit(
  sqlite3 *db,                    /* Database connection (for malloc()) */
  int nField,                     /* Number of key fields in each record */
  VdbeCursor *pCsr                /* Cursor that holds the new sorter */
){
  int pgsz;                       /* Page size of main database */
  int i;                          /* Used to iterate through aTask[] */

  VdbeSorter *pSorter;            /* The new sorter */
  KeyInfo *pKeyInfo;              /* Copy of pCsr->pKeyInfo with db==0 */
  int szKeyInfo;                  /* Size of pCsr->pKeyInfo in bytes */
  int sz;                         /* Size of pSorter in bytes */
  int rc = SQLITE_OK;
#if SQLITE_MAX_WORKER_THREADS==0
# define nWorker 0
................................................................................
    pSorter->db = db;
    for(i=0; i<pSorter->nTask; i++){
      SortSubtask *pTask = &pSorter->aTask[i];
      pTask->pSorter = pSorter;
    }

    if( !sqlite3TempInMemory(db) ){
      i64 mxCache;                /* Cache size in bytes*/
      u32 szPma = sqlite3GlobalConfig.szPma;
      pSorter->mnPmaSize = szPma * pgsz;

      mxCache = db->aDb[0].pSchema->cache_size;
      if( mxCache<0 ){
        /* A negative cache-size value C indicates that the cache is abs(C)
        ** KiB in size.  */
        mxCache = mxCache * -1024;
      }else{
        mxCache = mxCache * pgsz;
      }
      mxCache = MIN(mxCache, SQLITE_MAX_PMASZ);
      pSorter->mxPmaSize = MAX(pSorter->mnPmaSize, (int)mxCache);

      /* EVIDENCE-OF: R-26747-61719 When the application provides any amount of
      ** scratch memory using SQLITE_CONFIG_SCRATCH, SQLite avoids unnecessary
      ** large heap allocations.
      */
      if( sqlite3GlobalConfig.pScratch==0 ){
        assert( pSorter->iMemory==0 );
................................................................................
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains code use to implement an in-memory rollback journal.
** The in-memory rollback journal is used to journal transactions for
** ":memory:" databases and when the journal_mode=MEMORY pragma is used.
**
** Update:  The in-memory journal is also used to temporarily cache
** smaller journals that are not critical for power-loss recovery.
** For example, statement journals that are not too big will be held
** entirely in memory, thus reducing the number of file I/O calls, and
** more importantly, reducing temporary file creation events.  If these
** journals become too large for memory, they are spilled to disk.  But
** in the common case, they are usually small and no file I/O needs to
** occur.
*/
/* #include "sqliteInt.h" */

/* Forward references to internal structures */
typedef struct MemJournal MemJournal;
typedef struct FilePoint FilePoint;
typedef struct FileChunk FileChunk;
................................................................................
    pNew->op = (u8)op;
    pNew->iAgg = -1;
    if( pToken ){
      if( nExtra==0 ){
        pNew->flags |= EP_IntValue;
        pNew->u.iValue = iValue;
      }else{

        pNew->u.zToken = (char*)&pNew[1];
        assert( pToken->z!=0 || pToken->n==0 );
        if( pToken->n ) memcpy(pNew->u.zToken, pToken->z, pToken->n);
        pNew->u.zToken[pToken->n] = 0;
        if( dequote && sqlite3Isquote(pNew->u.zToken[0]) ){
          if( pNew->u.zToken[0]=='"' ) pNew->flags |= EP_DblQuoted;
          sqlite3Dequote(pNew->u.zToken);

        }
      }
    }
#if SQLITE_MAX_EXPR_DEPTH>0
    pNew->nHeight = 1;
#endif  
  }
................................................................................
    sqlite3ExprAttachSubtrees(pParse->db, p, pLeft, pRight);
  }
  if( p ) {
    sqlite3ExprCheckHeight(pParse, p->nHeight);
  }
  return p;
}

/*
** Add pSelect to the Expr.x.pSelect field.  Or, if pExpr is NULL (due
** do a memory allocation failure) then delete the pSelect object.
*/
SQLITE_PRIVATE void sqlite3PExprAddSelect(Parse *pParse, Expr *pExpr, Select *pSelect){
  if( pExpr ){
    pExpr->x.pSelect = pSelect;
    ExprSetProperty(pExpr, EP_xIsSelect|EP_Subquery);
    sqlite3ExprSetHeightAndFlags(pParse, pExpr);
  }else{
    assert( pParse->db->mallocFailed );
    sqlite3SelectDelete(pParse->db, pSelect);
  }
}


/*
** If the expression is always either TRUE or FALSE (respectively),
** then return 1.  If one cannot determine the truth value of the
** expression at compile-time return 0.
**
** This is an optimization.  If is OK to return 0 here even if
................................................................................
    sqlite3ErrorMsg(pParse, "too many SQL variables");
  }
}

/*
** Recursively delete an expression tree.
*/
static SQLITE_NOINLINE void sqlite3ExprDeleteNN(sqlite3 *db, Expr *p){
  assert( p!=0 );
  /* Sanity check: Assert that the IntValue is non-negative if it exists */
  assert( !ExprHasProperty(p, EP_IntValue) || p->u.iValue>=0 );
  if( !ExprHasProperty(p, EP_TokenOnly) ){
    /* The Expr.x union is never used at the same time as Expr.pRight */
    assert( p->x.pList==0 || p->pRight==0 );
    sqlite3ExprDelete(db, p->pLeft);
    sqlite3ExprDelete(db, p->pRight);
................................................................................
    }else{
      sqlite3ExprListDelete(db, p->x.pList);
    }
  }
  if( !ExprHasProperty(p, EP_Static) ){
    sqlite3DbFree(db, p);
  }
}
SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3 *db, Expr *p){
  if( p ) sqlite3ExprDeleteNN(db, p);
}

/*
** Return the number of bytes allocated for the expression structure 
** passed as the first argument. This is always one of EXPR_FULLSIZE,
** EXPR_REDUCEDSIZE or EXPR_TOKENONLYSIZE.
*/
................................................................................
** to enforce this constraint.
*/
static int dupedExprStructSize(Expr *p, int flags){
  int nSize;
  assert( flags==EXPRDUP_REDUCE || flags==0 ); /* Only one flag value allowed */
  assert( EXPR_FULLSIZE<=0xfff );
  assert( (0xfff & (EP_Reduced|EP_TokenOnly))==0 );
  if( 0==flags ){
    nSize = EXPR_FULLSIZE;
  }else{
    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
    assert( !ExprHasProperty(p, EP_FromJoin) ); 
    assert( !ExprHasProperty(p, EP_MemToken) );
    assert( !ExprHasProperty(p, EP_NoReduce) );
    if( p->pLeft || p->x.pList ){
................................................................................
** This function is similar to sqlite3ExprDup(), except that if pzBuffer 
** is not NULL then *pzBuffer is assumed to point to a buffer large enough 
** to store the copy of expression p, the copies of p->u.zToken
** (if applicable), and the copies of the p->pLeft and p->pRight expressions,
** if any. Before returning, *pzBuffer is set to the first byte past the
** portion of the buffer copied into by this function.
*/
static Expr *exprDup(sqlite3 *db, Expr *p, int dupFlags, u8 **pzBuffer){
  Expr *pNew;           /* Value to return */
  u8 *zAlloc;           /* Memory space from which to build Expr object */
  u32 staticFlag;       /* EP_Static if space not obtained from malloc */

  assert( db!=0 );
  assert( p );


  assert( dupFlags==0 || dupFlags==EXPRDUP_REDUCE );

  assert( pzBuffer==0 || dupFlags==EXPRDUP_REDUCE );

  /* Figure out where to write the new Expr structure. */
  if( pzBuffer ){
    zAlloc = *pzBuffer;
    staticFlag = EP_Static;
  }else{
    zAlloc = sqlite3DbMallocRawNN(db, dupedExprSize(p, dupFlags));
    staticFlag = 0;
  }
  pNew = (Expr *)zAlloc;

  if( pNew ){
    /* Set nNewSize to the size allocated for the structure pointed to
    ** by pNew. This is either EXPR_FULLSIZE, EXPR_REDUCEDSIZE or
    ** EXPR_TOKENONLYSIZE. nToken is set to the number of bytes consumed
    ** by the copy of the p->u.zToken string (if any).
    */
    const unsigned nStructSize = dupedExprStructSize(p, dupFlags);
    const int nNewSize = nStructSize & 0xfff;
    int nToken;
    if( !ExprHasProperty(p, EP_IntValue) && p->u.zToken ){
      nToken = sqlite3Strlen30(p->u.zToken) + 1;
    }else{
      nToken = 0;
    }
    if( dupFlags ){
      assert( ExprHasProperty(p, EP_Reduced)==0 );
      memcpy(zAlloc, p, nNewSize);
    }else{
      u32 nSize = (u32)exprStructSize(p);
      memcpy(zAlloc, p, nSize);
      if( nSize<EXPR_FULLSIZE ){ 
        memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
      }
    }

    /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
    pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static|EP_MemToken);
    pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
    pNew->flags |= staticFlag;

    /* Copy the p->u.zToken string, if any. */
    if( nToken ){
      char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
      memcpy(zToken, p->u.zToken, nToken);
    }

    if( 0==((p->flags|pNew->flags) & EP_TokenOnly) ){
      /* Fill in the pNew->x.pSelect or pNew->x.pList member. */
      if( ExprHasProperty(p, EP_xIsSelect) ){
        pNew->x.pSelect = sqlite3SelectDup(db, p->x.pSelect, dupFlags);
      }else{
        pNew->x.pList = sqlite3ExprListDup(db, p->x.pList, dupFlags);
      }
    }

    /* Fill in pNew->pLeft and pNew->pRight. */
    if( ExprHasProperty(pNew, EP_Reduced|EP_TokenOnly) ){
      zAlloc += dupedExprNodeSize(p, dupFlags);
      if( ExprHasProperty(pNew, EP_Reduced) ){
        pNew->pLeft = p->pLeft ?
                      exprDup(db, p->pLeft, EXPRDUP_REDUCE, &zAlloc) : 0;
        pNew->pRight = p->pRight ?
                       exprDup(db, p->pRight, EXPRDUP_REDUCE, &zAlloc) : 0;
      }
      if( pzBuffer ){
        *pzBuffer = zAlloc;
      }
    }else{
      if( !ExprHasProperty(p, EP_TokenOnly) ){
        pNew->pLeft = sqlite3ExprDup(db, p->pLeft, 0);
        pNew->pRight = sqlite3ExprDup(db, p->pRight, 0);
      }


    }
  }
  return pNew;
}

/*
** Create and return a deep copy of the object passed as the second 
................................................................................
** The flags parameter contains a combination of the EXPRDUP_XXX flags.
** If the EXPRDUP_REDUCE flag is set, then the structure returned is a
** truncated version of the usual Expr structure that will be stored as
** part of the in-memory representation of the database schema.
*/
SQLITE_PRIVATE Expr *sqlite3ExprDup(sqlite3 *db, Expr *p, int flags){
  assert( flags==0 || flags==EXPRDUP_REDUCE );
  return p ? exprDup(db, p, flags, 0) : 0;
}
SQLITE_PRIVATE ExprList *sqlite3ExprListDup(sqlite3 *db, ExprList *p, int flags){
  ExprList *pNew;
  struct ExprList_item *pItem, *pOldItem;
  int i;
  assert( db!=0 );
  if( p==0 ) return 0;
................................................................................
  assert( pList!=0 || pParse->db->mallocFailed!=0 );
  if( pList ){
    struct ExprList_item *pItem;
    assert( pList->nExpr>0 );
    pItem = &pList->a[pList->nExpr-1];
    assert( pItem->zName==0 );
    pItem->zName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);
    if( dequote ) sqlite3Dequote(pItem->zName);
  }
}

/*
** Set the ExprList.a[].zSpan element of the most recently added item
** on the expression list.
**
................................................................................
    sqlite3ErrorMsg(pParse, "too many columns in %s", zObject);
  }
}

/*
** Delete an entire expression list.
*/
static SQLITE_NOINLINE void exprListDeleteNN(sqlite3 *db, ExprList *pList){
  int i;
  struct ExprList_item *pItem;

  assert( pList->a!=0 || pList->nExpr==0 );
  for(pItem=pList->a, i=0; i<pList->nExpr; i++, pItem++){
    sqlite3ExprDelete(db, pItem->pExpr);
    sqlite3DbFree(db, pItem->zName);
    sqlite3DbFree(db, pItem->zSpan);
  }
  sqlite3DbFree(db, pList->a);
  sqlite3DbFree(db, pList);
}
SQLITE_PRIVATE void sqlite3ExprListDelete(sqlite3 *db, ExprList *pList){
  if( pList ) exprListDeleteNN(db, pList);
}

/*
** Return the bitwise-OR of all Expr.flags fields in the given
** ExprList.
*/
SQLITE_PRIVATE u32 sqlite3ExprListFlags(const ExprList *pList){
................................................................................
        codeReal(v, z, negFlag, iMem);
      }
#endif
    }
  }
}

#if defined(SQLITE_DEBUG)
/*
** Verify the consistency of the column cache
*/
static int cacheIsValid(Parse *pParse){
  int i, n;
  for(i=n=0; i<SQLITE_N_COLCACHE; i++){
    if( pParse->aColCache[i].iReg>0 ) n++;
  }
  return n==pParse->nColCache;
}
#endif

/*
** Clear a cache entry.
*/
static void cacheEntryClear(Parse *pParse, struct yColCache *p){
  if( p->tempReg ){
    if( pParse->nTempReg<ArraySize(pParse->aTempReg) ){
      pParse->aTempReg[pParse->nTempReg++] = p->iReg;
    }
    p->tempReg = 0;
  }
  p->iReg = 0;
  pParse->nColCache--;
  assert( pParse->db->mallocFailed || cacheIsValid(pParse) );
}


/*
** Record in the column cache that a particular column from a
** particular table is stored in a particular register.
*/
................................................................................
    if( p->iReg==0 ){
      p->iLevel = pParse->iCacheLevel;
      p->iTable = iTab;
      p->iColumn = iCol;
      p->iReg = iReg;
      p->tempReg = 0;
      p->lru = pParse->iCacheCnt++;
      pParse->nColCache++;
      assert( pParse->db->mallocFailed || cacheIsValid(pParse) );
      return;
    }
  }

  /* Replace the last recently used */
  minLru = 0x7fffffff;
  idxLru = -1;
................................................................................
    p = &pParse->aColCache[idxLru];
    p->iLevel = pParse->iCacheLevel;
    p->iTable = iTab;
    p->iColumn = iCol;
    p->iReg = iReg;
    p->tempReg = 0;
    p->lru = pParse->iCacheCnt++;
    assert( cacheIsValid(pParse) );
    return;
  }
}

/*
** Indicate that registers between iReg..iReg+nReg-1 are being overwritten.
** Purge the range of registers from the column cache.
*/
SQLITE_PRIVATE void sqlite3ExprCacheRemove(Parse *pParse, int iReg, int nReg){
  struct yColCache *p;
  if( iReg<=0 || pParse->nColCache==0 ) return;
  p = &pParse->aColCache[SQLITE_N_COLCACHE-1];
  while(1){
    if( p->iReg >= iReg && p->iReg < iReg+nReg ) cacheEntryClear(pParse, p);
    if( p==pParse->aColCache ) break;
    p--;


  }
}

/*
** Remember the current column cache context.  Any new entries added
** added to the column cache after this call are removed when the
** corresponding pop occurs.
................................................................................
  if( pParse->db->flags & SQLITE_VdbeAddopTrace ){
    printf("POP  to %d\n", pParse->iCacheLevel);
  }
#endif
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg && p->iLevel>pParse->iCacheLevel ){
      cacheEntryClear(pParse, p);

    }
  }
}

/*
** When a cached column is reused, make sure that its register is
** no longer available as a temp register.  ticket #3879:  that same
................................................................................
  if( pParse->db->flags & SQLITE_VdbeAddopTrace ){
    printf("CLEAR\n");
  }
#endif
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    if( p->iReg ){
      cacheEntryClear(pParse, p);

    }
  }
}

/*
** Record the fact that an affinity change has occurred on iCount
** registers starting with iStart.
................................................................................
  for(i=0, p=pParse->aColCache; i<SQLITE_N_COLCACHE; i++, p++){
    int r = p->iReg;
    if( r>=iFrom && r<=iTo ) return 1;    /*NO_TEST*/
  }
  return 0;
}
#endif /* SQLITE_DEBUG || SQLITE_COVERAGE_TEST */


/*
** Convert an expression node to a TK_REGISTER
*/
static void exprToRegister(Expr *p, int iReg){
  p->op2 = p->op;
  p->op = TK_REGISTER;
................................................................................
    ** 'BLOB'. */
    pCol->affinity = SQLITE_AFF_BLOB;
    pCol->szEst = 1;
  }else{
    zType = z + sqlite3Strlen30(z) + 1;
    memcpy(zType, pType->z, pType->n);
    zType[pType->n] = 0;
    sqlite3Dequote(zType);
    pCol->affinity = sqlite3AffinityType(zType, &pCol->szEst);
    pCol->colFlags |= COLFLAG_HASTYPE;
  }
  p->nCol++;
  pParse->constraintName.n = 0;
}

................................................................................
  SrcList *pSelectSrc = NULL;  /* SELECT rowid FROM x ... (dup of pSrc) */
  Select *pSelect = NULL;      /* Complete SELECT tree */

  /* Check that there isn't an ORDER BY without a LIMIT clause.
  */
  if( pOrderBy && (pLimit == 0) ) {
    sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on %s", zStmtType);
    goto limit_where_cleanup;
  }

  /* We only need to generate a select expression if there
  ** is a limit/offset term to enforce.
  */
  if( pLimit == 0 ) {
    /* if pLimit is null, pOffset will always be null as well. */
................................................................................
  ** becomes:
  **   DELETE FROM table_a WHERE rowid IN ( 
  **     SELECT rowid FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
  **   );
  */

  pSelectRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0, 0);
  if( pSelectRowid == 0 ) goto limit_where_cleanup;
  pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid);
  if( pEList == 0 ) goto limit_where_cleanup;

  /* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
  ** and the SELECT subtree. */
  pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc, 0);
  if( pSelectSrc == 0 ) {
    sqlite3ExprListDelete(pParse->db, pEList);
    goto limit_where_cleanup;
  }

  /* generate the SELECT expression tree. */
  pSelect = sqlite3SelectNew(pParse,pEList,pSelectSrc,pWhere,0,0,
                             pOrderBy,0,pLimit,pOffset);
  if( pSelect == 0 ) return 0;

  /* now generate the new WHERE rowid IN clause for the DELETE/UDPATE */
  pWhereRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0, 0);

  pInClause = pWhereRowid ? sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0, 0) : 0;




  sqlite3PExprAddSelect(pParse, pInClause, pSelect);
  return pInClause;


limit_where_cleanup:




  sqlite3ExprDelete(pParse->db, pWhere);
  sqlite3ExprListDelete(pParse->db, pOrderBy);
  sqlite3ExprDelete(pParse->db, pLimit);
  sqlite3ExprDelete(pParse->db, pOffset);
  return 0;
}
#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) */
................................................................................
  int iKey;              /* Memory cell holding key of row to be deleted */
  i16 nKey;              /* Number of memory cells in the row key */
  int iEphCur = 0;       /* Ephemeral table holding all primary key values */
  int iRowSet = 0;       /* Register for rowset of rows to delete */
  int addrBypass = 0;    /* Address of jump over the delete logic */
  int addrLoop = 0;      /* Top of the delete loop */
  int addrEphOpen = 0;   /* Instruction to open the Ephemeral table */
  int bComplex;          /* True if there are triggers or FKs or or
                         ** subqueries in the WHERE clause */
 
#ifndef SQLITE_OMIT_TRIGGER
  int isView;                  /* True if attempting to delete from a view */
  Trigger *pTrigger;           /* List of table triggers, if required */

#endif

  memset(&sContext, 0, sizeof(sContext));
  db = pParse->db;
  if( pParse->nErr || db->mallocFailed ){
    goto delete_from_cleanup;
  }
................................................................................
#ifndef SQLITE_OMIT_TRIGGER
  pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
  isView = pTab->pSelect!=0;
  bComplex = pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0);
#else
# define pTrigger 0
# define isView 0

#endif
#ifdef SQLITE_OMIT_VIEW
# undef isView
# define isView 0
#endif

  /* If pTab is really a view, make sure it has been initialized.
................................................................................
      assert( pIdx->pSchema==pTab->pSchema );
      sqlite3VdbeAddOp2(v, OP_Clear, pIdx->tnum, iDb);
    }
  }else
#endif /* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
  {
    u16 wcf = WHERE_ONEPASS_DESIRED|WHERE_DUPLICATES_OK;
    if( pWhere && ExprHasProperty(pWhere, EP_Subquery) ) bComplex = 1;
    wcf |= (bComplex ? 0 : WHERE_ONEPASS_MULTIROW);
    if( HasRowid(pTab) ){
      /* For a rowid table, initialize the RowSet to an empty set */
      pPk = 0;
      nPk = 1;
      iRowSet = ++pParse->nMem;
      sqlite3VdbeAddOp2(v, OP_Null, 0, iRowSet);
................................................................................
** A function that loads a shared-library extension then returns NULL.
*/
static void loadExt(sqlite3_context *context, int argc, sqlite3_value **argv){
  const char *zFile = (const char *)sqlite3_value_text(argv[0]);
  const char *zProc;
  sqlite3 *db = sqlite3_context_db_handle(context);
  char *zErrMsg = 0;

  /* Disallow the load_extension() SQL function unless the SQLITE_LoadExtFunc
  ** flag is set.  See the sqlite3_enable_load_extension() API.
  */
  if( (db->flags & SQLITE_LoadExtFunc)==0 ){
    sqlite3_result_error(context, "not authorized", -1);
    return;
  }

  if( argc==2 ){
    zProc = (const char *)sqlite3_value_text(argv[1]);
  }else{
    zProc = 0;
  }
  if( zFile && sqlite3_load_extension(db, zFile, zProc, &zErrMsg) ){
................................................................................


  if( pzErrMsg ) *pzErrMsg = 0;

  /* Ticket #1863.  To avoid a creating security problems for older
  ** applications that relink against newer versions of SQLite, the
  ** ability to run load_extension is turned off by default.  One
  ** must call either sqlite3_enable_load_extension(db) or
  ** sqlite3_db_config(db, SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, 1, 0)
  ** to turn on extension loading.
  */
  if( (db->flags & SQLITE_LoadExtension)==0 ){
    if( pzErrMsg ){
      *pzErrMsg = sqlite3_mprintf("not authorized");
    }
    return SQLITE_ERROR;
  }
................................................................................
/*
** Enable or disable extension loading.  Extension loading is disabled by
** default so as not to open security holes in older applications.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_enable_load_extension(sqlite3 *db, int onoff){
  sqlite3_mutex_enter(db->mutex);
  if( onoff ){
    db->flags |= SQLITE_LoadExtension|SQLITE_LoadExtFunc;
  }else{
    db->flags &= ~(SQLITE_LoadExtension|SQLITE_LoadExtFunc);
  }
  sqlite3_mutex_leave(db->mutex);
  return SQLITE_OK;
}

#endif /* SQLITE_OMIT_LOAD_EXTENSION */

................................................................................
    sqlite3SrcListDelete(db, p->pSrc);
    sqlite3ExprDelete(db, p->pWhere);
    sqlite3ExprListDelete(db, p->pGroupBy);
    sqlite3ExprDelete(db, p->pHaving);
    sqlite3ExprListDelete(db, p->pOrderBy);
    sqlite3ExprDelete(db, p->pLimit);
    sqlite3ExprDelete(db, p->pOffset);
    if( p->pWith ) sqlite3WithDelete(db, p->pWith);
    if( bFree ) sqlite3DbFree(db, p);
    p = pPrior;
    bFree = 1;
  }
}

/*
................................................................................
#endif


/*
** Delete the given Select structure and all of its substructures.
*/
SQLITE_PRIVATE void sqlite3SelectDelete(sqlite3 *db, Select *p){
  if( p ) clearSelect(db, p, 1);
}

/*
** Return a pointer to the right-most SELECT statement in a compound.
*/
static Select *findRightmost(Select *p){
  while( p->pNext ) p = p->pNext;
................................................................................
  return pTab;
}

/*
** Get a VDBE for the given parser context.  Create a new one if necessary.
** If an error occurs, return NULL and leave a message in pParse.
*/
static SQLITE_NOINLINE Vdbe *allocVdbe(Parse *pParse){


  Vdbe *v = pParse->pVdbe = sqlite3VdbeCreate(pParse);
  if( v ) sqlite3VdbeAddOp0(v, OP_Init);
  if( pParse->pToplevel==0
   && OptimizationEnabled(pParse->db,SQLITE_FactorOutConst)
  ){
    pParse->okConstFactor = 1;
  }
  return v;
}

SQLITE_PRIVATE Vdbe *sqlite3GetVdbe(Parse *pParse){
  Vdbe *v = pParse->pVdbe;
  return v ? v : allocVdbe(pParse);
}


/*
** Compute the iLimit and iOffset fields of the SELECT based on the
** pLimit and pOffset expressions.  pLimit and pOffset hold the expressions
** that appear in the original SQL statement after the LIMIT and OFFSET
................................................................................
  sqlite3 *db,          /* The database connection (for malloc()) */
  Select *pSubq,        /* The subquery whose WHERE clause is to be augmented */
  Expr *pWhere,         /* The WHERE clause of the outer query */
  int iCursor           /* Cursor number of the subquery */
){
  Expr *pNew;
  int nChng = 0;
  Select *pX;           /* For looping over compound SELECTs in pSubq */
  if( pWhere==0 ) return 0;
  for(pX=pSubq; pX; pX=pX->pPrior){
    if( (pX->selFlags & (SF_Aggregate|SF_Recursive))!=0 ){
      testcase( pX->selFlags & SF_Aggregate );
      testcase( pX->selFlags & SF_Recursive );
      testcase( pX!=pSubq );
      return 0; /* restrictions (1) and (2) */
    }
  }
  if( pSubq->pLimit!=0 ){
    return 0; /* restriction (3) */
  }
  while( pWhere->op==TK_AND ){
    nChng += pushDownWhereTerms(db, pSubq, pWhere->pRight, iCursor);
    pWhere = pWhere->pLeft;
  }
  if( ExprHasProperty(pWhere,EP_FromJoin) ) return 0; /* restriction 5 */
  if( sqlite3ExprIsTableConstant(pWhere, iCursor) ){
................................................................................
  ){
    p->selFlags &= ~SF_Distinct;
    pGroupBy = p->pGroupBy = sqlite3ExprListDup(db, pEList, 0);
    /* Notice that even thought SF_Distinct has been cleared from p->selFlags,
    ** the sDistinct.isTnct is still set.  Hence, isTnct represents the
    ** original setting of the SF_Distinct flag, not the current setting */
    assert( sDistinct.isTnct );

#if SELECTTRACE_ENABLED
    if( sqlite3SelectTrace & 0x400 ){
      SELECTTRACE(0x400,pParse,p,("Transform DISTINCT into GROUP BY:\n"));
      sqlite3TreeViewSelect(0, p, 0);
    }
#endif
  }

  /* If there is an ORDER BY clause, then create an ephemeral index to
  ** do the sorting.  But this sorting ephemeral index might end up
  ** being unused if the data can be extracted in pre-sorted order.
  ** If that is the case, then the OP_OpenEphemeral instruction will be
  ** changed to an OP_Noop once we figure out that the sorting index is
................................................................................
  int addrBrk;          /* Jump here to break out of the loop */
  int addrNxt;          /* Jump here to start the next IN combination */
  int addrSkip;         /* Jump here for next iteration of skip-scan */
  int addrCont;         /* Jump here to continue with the next loop cycle */
  int addrFirst;        /* First instruction of interior of the loop */
  int addrBody;         /* Beginning of the body of this loop */
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
  u32 iLikeRepCntr;     /* LIKE range processing counter register (times 2) */
  int addrLikeRep;      /* LIKE range processing address */
#endif
  u8 iFrom;             /* Which entry in the FROM clause */
  u8 op, p3, p5;        /* Opcode, P3 & P5 of the opcode that ends the loop */
  int p1, p2;           /* Operands of the opcode used to ends the loop */
  union {               /* Information that depends on pWLoop->wsFlags */
    struct {
................................................................................
** An instance of this object holds the complete state of the query
** planner.
*/
struct WhereInfo {
  Parse *pParse;            /* Parsing and code generating context */
  SrcList *pTabList;        /* List of tables in the join */
  ExprList *pOrderBy;       /* The ORDER BY clause or NULL */
  ExprList *pDistinctSet;   /* DISTINCT over all these values */
  WhereLoop *pLoops;        /* List of all WhereLoop objects */
  Bitmask revMask;          /* Mask of ORDER BY terms that need reversing */
  LogEst nRowOut;           /* Estimated number of output rows */
  LogEst iLimit;            /* LIMIT if wctrlFlags has WHERE_USE_LIMIT */
  u16 wctrlFlags;           /* Flags originally passed to sqlite3WhereBegin() */
  i8 nOBSat;                /* Number of ORDER BY terms satisfied by indices */
  u8 sorted;                /* True if really sorted (not just grouped) */
................................................................................


/*
** Bitmasks for the operators on WhereTerm objects.  These are all
** operators that are of interest to the query planner.  An
** OR-ed combination of these values can be used when searching for
** particular WhereTerms within a WhereClause.
**
** Value constraints:
**     WO_EQ    == SQLITE_INDEX_CONSTRAINT_EQ
**     WO_LT    == SQLITE_INDEX_CONSTRAINT_LT
**     WO_LE    == SQLITE_INDEX_CONSTRAINT_LE
**     WO_GT    == SQLITE_INDEX_CONSTRAINT_GT
**     WO_GE    == SQLITE_INDEX_CONSTRAINT_GE
**     WO_MATCH == SQLITE_INDEX_CONSTRAINT_MATCH
*/
#define WO_IN     0x0001
#define WO_EQ     0x0002
#define WO_LT     (WO_EQ<<(TK_LT-TK_EQ))
#define WO_LE     (WO_EQ<<(TK_LE-TK_EQ))
#define WO_GT     (WO_EQ<<(TK_GT-TK_EQ))
#define WO_GE     (WO_EQ<<(TK_GE-TK_EQ))
................................................................................
  }
  *pzAff = zAff;
  return regBase;
}

#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
/*
** If the most recently coded instruction is a constant range constraint
** (a string literal) that originated from the LIKE optimization, then 
** set P3 and P5 on the OP_String opcode so that the string will be cast
** to a BLOB at appropriate times.
**
** The LIKE optimization trys to evaluate "x LIKE 'abc%'" as a range
** expression: "x>='ABC' AND x<'abd'".  But this requires that the range
** scan loop run twice, once for strings and a second time for BLOBs.
** The OP_String opcodes on the second pass convert the upper and lower
** bound string contants to blobs.  This routine makes the necessary changes
** to the OP_String opcodes for that to happen.
................................................................................
  if( pTerm->wtFlags & TERM_LIKEOPT ){
    VdbeOp *pOp;
    assert( pLevel->iLikeRepCntr>0 );
    pOp = sqlite3VdbeGetOp(v, -1);
    assert( pOp!=0 );
    assert( pOp->opcode==OP_String8 
            || pTerm->pWC->pWInfo->pParse->db->mallocFailed );
    pOp->p3 = (int)(pLevel->iLikeRepCntr>>1);  /* Register holding counter */
    pOp->p5 = (u8)(pLevel->iLikeRepCntr&1);    /* ASC or DESC */
  }
}
#else
# define whereLikeOptimizationStringFixup(A,B,C)
#endif

#ifdef SQLITE_ENABLE_CURSOR_HINTS
................................................................................
            sqlite3ExprIfFalse(pParse, pCompare, pLevel->addrCont, 0);
          }
          pCompare->pLeft = 0;
          sqlite3ExprDelete(db, pCompare);
        }
      }
    }
    /* These registers need to be preserved in case there is an IN operator
    ** loop.  So we could deallocate the registers here (and potentially
    ** reuse them later) if (pLoop->wsFlags & WHERE_IN_ABLE)==0.  But it seems
    ** simpler and safer to simply not reuse the registers.
    **
    **    sqlite3ReleaseTempRange(pParse, iReg, nConstraint+2);
    */
    sqlite3ExprCachePop(pParse);
  }else
#endif /* SQLITE_OMIT_VIRTUALTABLE */

  if( (pLoop->wsFlags & WHERE_IPK)!=0
   && (pLoop->wsFlags & (WHERE_COLUMN_IN|WHERE_COLUMN_EQ))!=0
  ){
................................................................................
    if( pLoop->wsFlags & WHERE_TOP_LIMIT ){
      pRangeEnd = pLoop->aLTerm[j++];
      nExtraReg = 1;
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
      if( (pRangeEnd->wtFlags & TERM_LIKEOPT)!=0 ){
        assert( pRangeStart!=0 );                     /* LIKE opt constraints */
        assert( pRangeStart->wtFlags & TERM_LIKEOPT );   /* occur in pairs */
        pLevel->iLikeRepCntr = (u32)++pParse->nMem;
        sqlite3VdbeAddOp2(v, OP_Integer, 1, (int)pLevel->iLikeRepCntr);
        VdbeComment((v, "LIKE loop counter"));
        pLevel->addrLikeRep = sqlite3VdbeCurrentAddr(v);
        /* iLikeRepCntr actually stores 2x the counter register number.  The
        ** bottom bit indicates whether the search order is ASC or DESC. */
        testcase( bRev );
        testcase( pIdx->aSortOrder[nEq]==SQLITE_SO_DESC );


        assert( (bRev & ~1)==0 );
        pLevel->iLikeRepCntr <<=1;


        pLevel->iLikeRepCntr |= bRev ^ (pIdx->aSortOrder[nEq]==SQLITE_SO_DESC);
      }
#endif
      if( pRangeStart==0
       && (j = pIdx->aiColumn[nEq])>=0 
       && pIdx->pTable->aCol[j].notNull==0
      ){
        bSeekPastNull = 1;
................................................................................
    }
    pE = pTerm->pExpr;
    assert( pE!=0 );
    if( pLevel->iLeftJoin && !ExprHasProperty(pE, EP_FromJoin) ){
      continue;
    }
    if( pTerm->wtFlags & TERM_LIKECOND ){
      /* If the TERM_LIKECOND flag is set, that means that the range search
      ** is sufficient to guarantee that the LIKE operator is true, so we
      ** can skip the call to the like(A,B) function.  But this only works
      ** for strings.  So do not skip the call to the function on the pass
      ** that compares BLOBs. */
#ifdef SQLITE_LIKE_DOESNT_MATCH_BLOBS
      continue;
#else
      u32 x = pLevel->iLikeRepCntr;
      assert( x>0 );
      skipLikeAddr = sqlite3VdbeAddOp1(v, (x&1)? OP_IfNot : OP_If, (int)(x>>1));
      VdbeCoverage(v);
#endif
    }
    sqlite3ExprIfFalse(pParse, pE, addrCont, SQLITE_JUMPIFNULL);
    if( skipLikeAddr ) sqlite3VdbeJumpHere(v, skipLikeAddr);
    pTerm->wtFlags |= TERM_CODED;
  }
................................................................................
  Bitmask mask = 0;
  if( p==0 ) return 0;
  if( p->op==TK_COLUMN ){
    mask = sqlite3WhereGetMask(pMaskSet, p->iTable);
    return mask;
  }
  mask = sqlite3WhereExprUsage(pMaskSet, p->pRight);
  if( p->pLeft ) mask |= sqlite3WhereExprUsage(pMaskSet, p->pLeft);
  if( ExprHasProperty(p, EP_xIsSelect) ){
    mask |= exprSelectUsage(pMaskSet, p->x.pSelect);
  }else if( p->x.pList ){
    mask |= sqlite3WhereExprListUsage(pMaskSet, p->x.pList);
  }
  return mask;
}
SQLITE_PRIVATE Bitmask sqlite3WhereExprListUsage(WhereMaskSet *pMaskSet, ExprList *pList){
  int i;
  Bitmask mask = 0;
................................................................................

#ifdef WHERETRACE_ENABLED
/*
** Print a WhereLoop object for debugging purposes
*/
static void whereLoopPrint(WhereLoop *p, WhereClause *pWC){
  WhereInfo *pWInfo = pWC->pWInfo;
  int nb = 1+(pWInfo->pTabList->nSrc+3)/4;
  struct SrcList_item *pItem = pWInfo->pTabList->a + p->iTab;
  Table *pTab = pItem->pTab;
  Bitmask mAll = (((Bitmask)1)<<(nb*4)) - 1;
  sqlite3DebugPrintf("%c%2d.%0*llx.%0*llx", p->cId,
                     p->iTab, nb, p->maskSelf, nb, p->prereq & mAll);
  sqlite3DebugPrintf(" %12s",
                     pItem->zAlias ? pItem->zAlias : pTab->zName);
  if( (p->wsFlags & WHERE_VIRTUALTABLE)==0 ){
    const char *zName;
    if( p->u.btree.pIndex && (zName = p->u.btree.pIndex->zName)!=0 ){
      if( strncmp(zName, "sqlite_autoindex_", 17)==0 ){
        int i = sqlite3Strlen30(zName) - 1;
................................................................................
  }
  if( (pWInfo->wctrlFlags & WHERE_WANT_DISTINCT)!=0
   && (pWInfo->wctrlFlags & WHERE_DISTINCTBY)==0
   && pWInfo->eDistinct==WHERE_DISTINCT_NOOP
   && nRowEst
  ){
    Bitmask notUsed;
    int rc = wherePathSatisfiesOrderBy(pWInfo, pWInfo->pDistinctSet, pFrom,
                 WHERE_DISTINCTBY, nLoop-1, pFrom->aLoop[nLoop-1], &notUsed);
    if( rc==pWInfo->pDistinctSet->nExpr ){
      pWInfo->eDistinct = WHERE_DISTINCT_ORDERED;
    }
  }
  if( pWInfo->pOrderBy ){
    if( pWInfo->wctrlFlags & WHERE_DISTINCTBY ){
      if( pFrom->isOrdered==pWInfo->pOrderBy->nExpr ){
        pWInfo->eDistinct = WHERE_DISTINCT_ORDERED;
................................................................................
** to use for OR clause processing.  The WHERE clause should use this
** specific cursor.  If WHERE_ONEPASS_DESIRED is set, then iIdxCur is
** the first cursor in an array of cursors for all indices.  iIdxCur should
** be used to compute the appropriate cursor depending on which index is
** used.
*/
SQLITE_PRIVATE WhereInfo *sqlite3WhereBegin(
  Parse *pParse,          /* The parser context */
  SrcList *pTabList,      /* FROM clause: A list of all tables to be scanned */
  Expr *pWhere,           /* The WHERE clause */
  ExprList *pOrderBy,     /* An ORDER BY (or GROUP BY) clause, or NULL */
  ExprList *pDistinctSet, /* Try not to output two rows that duplicate these */
  u16 wctrlFlags,         /* The WHERE_* flags defined in sqliteInt.h */
  int iAuxArg             /* If WHERE_ONETABLE_ONLY is set, index cursor number
                          ** If WHERE_USE_LIMIT, then the limit amount */
){
  int nByteWInfo;            /* Num. bytes allocated for WhereInfo struct */
  int nTabList;              /* Number of elements in pTabList */
  WhereInfo *pWInfo;         /* Will become the return value of this function */
  Vdbe *v = pParse->pVdbe;   /* The virtual database engine */
  Bitmask notReady;          /* Cursors that are not yet positioned */
  WhereLoopBuilder sWLB;     /* The WhereLoop builder */
................................................................................
    goto whereBeginError;
  }
  pWInfo->aiCurOnePass[0] = pWInfo->aiCurOnePass[1] = -1;
  pWInfo->nLevel = nTabList;
  pWInfo->pParse = pParse;
  pWInfo->pTabList = pTabList;
  pWInfo->pOrderBy = pOrderBy;
  pWInfo->pDistinctSet = pDistinctSet;
  pWInfo->iBreak = pWInfo->iContinue = sqlite3VdbeMakeLabel(v);
  pWInfo->wctrlFlags = wctrlFlags;
  pWInfo->iLimit = iAuxArg;
  pWInfo->savedNQueryLoop = pParse->nQueryLoop;
  assert( pWInfo->eOnePass==ONEPASS_OFF );  /* ONEPASS defaults to OFF */
  pMaskSet = &pWInfo->sMaskSet;
  sWLB.pWInfo = pWInfo;
................................................................................
#endif

  /* Analyze all of the subexpressions. */
  sqlite3WhereExprAnalyze(pTabList, &pWInfo->sWC);
  if( db->mallocFailed ) goto whereBeginError;

  if( wctrlFlags & WHERE_WANT_DISTINCT ){
    if( isDistinctRedundant(pParse, pTabList, &pWInfo->sWC, pDistinctSet) ){
      /* The DISTINCT marking is pointless.  Ignore it. */
      pWInfo->eDistinct = WHERE_DISTINCT_UNIQUE;
    }else if( pOrderBy==0 ){
      /* Try to ORDER BY the result set to make distinct processing easier */
      pWInfo->wctrlFlags |= WHERE_DISTINCTBY;
      pWInfo->pOrderBy = pDistinctSet;
    }
  }

  /* Construct the WhereLoop objects */
#if defined(WHERETRACE_ENABLED)
  if( sqlite3WhereTrace & 0xffff ){
    sqlite3DebugPrintf("*** Optimizer Start *** (wctrlFlags: 0x%x",wctrlFlags);
................................................................................
    for(ii=0; ii<pWInfo->nLevel; ii++){
      whereLoopPrint(pWInfo->a[ii].pWLoop, sWLB.pWC);
    }
  }
#endif
  /* Attempt to omit tables from the join that do not effect the result */
  if( pWInfo->nLevel>=2
   && pDistinctSet!=0
   && OptimizationEnabled(db, SQLITE_OmitNoopJoin)
  ){
    Bitmask tabUsed = sqlite3WhereExprListUsage(pMaskSet, pDistinctSet);
    if( sWLB.pOrderBy ){
      tabUsed |= sqlite3WhereExprListUsage(pMaskSet, sWLB.pOrderBy);
    }
    while( pWInfo->nLevel>=2 ){
      WhereTerm *pTerm, *pEnd;
      pLoop = pWInfo->a[pWInfo->nLevel-1].pWLoop;
      if( (pWInfo->pTabList->a[pLoop->iTab].fg.jointype & JT_LEFT)==0 ) break;
................................................................................
      sqlite3VdbeGoto(v, pLevel->addrSkip);
      VdbeComment((v, "next skip-scan on %s", pLoop->u.btree.pIndex->zName));
      sqlite3VdbeJumpHere(v, pLevel->addrSkip);
      sqlite3VdbeJumpHere(v, pLevel->addrSkip-2);
    }
#ifndef SQLITE_LIKE_DOESNT_MATCH_BLOBS
    if( pLevel->addrLikeRep ){
      sqlite3VdbeAddOp2(v, OP_DecrJumpZero, (int)(pLevel->iLikeRepCntr>>1),
                        pLevel->addrLikeRep);





      VdbeCoverage(v);
    }
#endif
    if( pLevel->iLeftJoin ){
      addr = sqlite3VdbeAddOp1(v, OP_IfPos, pLevel->iLeftJoin); VdbeCoverage(v);
      assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0
           || (pLoop->wsFlags & WHERE_INDEXED)!=0 );
................................................................................
#ifndef INTERFACE
# define INTERFACE 1
#endif
/************* Begin control #defines *****************************************/
#define YYCODETYPE unsigned char
#define YYNOCODE 251
#define YYACTIONTYPE unsigned short int
#define YYWILDCARD 96
#define sqlite3ParserTOKENTYPE Token
typedef union {
  int yyinit;
  sqlite3ParserTOKENTYPE yy0;
  struct LimitVal yy64;
  Expr* yy122;
  Select* yy159;
................................................................................
**  yy_shift_ofst[]    For each state, the offset into yy_action for
**                     shifting terminals.
**  yy_reduce_ofst[]   For each state, the offset into yy_action for
**                     shifting non-terminals after a reduce.
**  yy_default[]       Default action for each state.
**
*********** Begin parsing tables **********************************************/
#define YY_ACTTAB_COUNT (1501)
static const YYACTIONTYPE yy_action[] = {
 /*     0 */   315,  810,  339,  804,    5,  194,  194,  798,   92,   93,
 /*    10 */    83,  819,  819,  831,  834,  823,  823,   90,   90,   91,
 /*    20 */    91,   91,   91,  290,   89,   89,   89,   89,   88,   88,
 /*    30 */    87,   87,   87,   86,  339,  315,  952,  952,  803,  803,
 /*    40 */   803,  922,  342,   92,   93,   83,  819,  819,  831,  834,
 /*    50 */   823,  823,   90,   90,   91,   91,   91,   91,  123,   89,
 /*    60 */    89,   89,   89,   88,   88,   87,   87,   87,   86,  339,
 /*    70 */    88,   88,   87,   87,   87,   86,  339,  772,  952,  952,
 /*    80 */   315,   87,   87,   87,   86,  339,  773,   68,   92,   93,
 /*    90 */    83,  819,  819,  831,  834,  823,  823,   90,   90,   91,
 /*   100 */    91,   91,   91,  434,   89,   89,   89,   89,   88,   88,
 /*   110 */    87,   87,   87,   86,  339, 1302,  146,  921,    2,  315,
 /*   120 */   427,   24,  679,  953,   48,   86,  339,   92,   93,   83,
 /*   130 */   819,  819,  831,  834,  823,  823,   90,   90,   91,   91,
 /*   140 */    91,   91,   94,   89,   89,   89,   89,   88,   88,   87,
 /*   150 */    87,   87,   86,  339,  933,  933,  315,  259,  412,  398,
 /*   160 */   396,   57,  733,  733,   92,   93,   83,  819,  819,  831,
 /*   170 */   834,  823,  823,   90,   90,   91,   91,   91,   91,   56,
 /*   180 */    89,   89,   89,   89,   88,   88,   87,   87,   87,   86,
 /*   190 */   339,  315, 1245,  922,  342,  268,  934,  935,  241,   92,
 /*   200 */    93,   83,  819,  819,  831,  834,  823,  823,   90,   90,
 /*   210 */    91,   91,   91,   91,  291,   89,   89,   89,   89,   88,
 /*   220 */    88,   87,   87,   87,   86,  339,  315,  913, 1295,  682,
 /*   230 */   687, 1295,  233,  397,   92,   93,   83,  819,  819,  831,
 /*   240 */   834,  823,  823,   90,   90,   91,   91,   91,   91,  326,
 /*   250 */    89,   89,   89,   89,   88,   88,   87,   87,   87,   86,
 /*   260 */   339,  315,   85,   82,  168,  680,  431,  938,  939,   92,
 /*   270 */    93,   83,  819,  819,  831,  834,  823,  823,   90,   90,
 /*   280 */    91,   91,   91,   91,  291,   89,   89,   89,   89,   88,
 /*   290 */    88,   87,   87,   87,   86,  339,  315,  319,  913, 1296,
 /*   300 */   797,  911, 1296,  681,   92,   93,   83,  819,  819,  831,
 /*   310 */   834,  823,  823,   90,   90,   91,   91,   91,   91,  335,
 /*   320 */    89,   89,   89,   89,   88,   88,   87,   87,   87,   86,
 /*   330 */   339,  315,  876,  876,  373,   85,   82,  168,  944,   92,
 /*   340 */    93,   83,  819,  819,  831,  834,  823,  823,   90,   90,
 /*   350 */    91,   91,   91,   91,  896,   89,   89,   89,   89,   88,
 /*   360 */    88,   87,   87,   87,   86,  339,  315,  370,  307,  973,
 /*   370 */   367,    1,  911,  433,   92,   93,   83,  819,  819,  831,
 /*   380 */   834,  823,  823,   90,   90,   91,   91,   91,   91,  189,
 /*   390 */    89,   89,   89,   89,   88,   88,   87,   87,   87,   86,
 /*   400 */   339,  315,  720,  948,  933,  933,  149,  718,  948,   92,
 /*   410 */    93,   83,  819,  819,  831,  834,  823,  823,   90,   90,
 /*   420 */    91,   91,   91,   91,  434,   89,   89,   89,   89,   88,
 /*   430 */    88,   87,   87,   87,   86,  339,  338,  938,  939,  947,
 /*   440 */   694,  940,  974,  315,  953,   48,  934,  935,  715,  689,
 /*   450 */    71,   92,   93,   83,  819,  819,  831,  834,  823,  823,
 /*   460 */    90,   90,   91,   91,   91,   91,  320,   89,   89,   89,
 /*   470 */    89,   88,   88,   87,   87,   87,   86,  339,  315,  412,
 /*   480 */   403,  820,  820,  832,  835,   74,   92,   81,   83,  819,
 /*   490 */   819,  831,  834,  823,  823,   90,   90,   91,   91,   91,
 /*   500 */    91,  698,   89,   89,   89,   89,   88,   88,   87,   87,
 /*   510 */    87,   86,  339,  315,  259,  654,  655,  656,  393,  111,
 /*   520 */   331,  153,   93,   83,  819,  819,  831,  834,  823,  823,
 /*   530 */    90,   90,   91,   91,   91,   91,  434,   89,   89,   89,
 /*   540 */    89,   88,   88,   87,   87,   87,   86,  339,  315,  188,
 /*   550 */   187,  186,  824,  937,  328,  219,  953,   48,   83,  819,
 /*   560 */   819,  831,  834,  823,  823,   90,   90,   91,   91,   91,
 /*   570 */    91,  956,   89,   89,   89,   89,   88,   88,   87,   87,
 /*   580 */    87,   86,  339,   79,  429,  738,    3, 1174,  955,  348,
 /*   590 */   737,  332,  792,  933,  933,  937,   79,  429,  730,    3,
 /*   600 */   203,  160,  278,  391,  273,  390,  190,  892,  434,  400,
 /*   610 */   741,   76,   77,  271,  287,  253,  353,  242,   78,  340,
 /*   620 */   340,   85,   82,  168,   76,   77,  233,  397,  953,   48,
 /*   630 */   432,   78,  340,  340,  277,  934,  935,  185,  439,  651,
 /*   640 */   388,  385,  384,  432,  234,  276,  107,  418,  349,  337,
 /*   650 */   336,  383,  893,  728,  215,  949,  123,  971,  308,  810,
 /*   660 */   418,  436,  435,  412,  394,  798,  400,  873,  894,  123,
 /*   670 */   721,  872,  810,  889,  436,  435,  215,  949,  798,  351,
 /*   680 */   722,  697,  380,  434,  771,  371,   22,  434,  400,   79,
 /*   690 */   429,  232,    3,  189,  413,  870,  803,  803,  803,  805,
 /*   700 */    18,   54,  148,  953,   48,  956,  113,  953,    9,  803,
 /*   710 */   803,  803,  805,   18,  310,  123,  748,   76,   77,  742,
 /*   720 */   123,  325,  955,  866,   78,  340,  340,  113,  350,  359,
 /*   730 */    85,   82,  168,  343,  960,  960,  432,  770,  412,  414,
 /*   740 */   407,   23, 1240, 1240,   79,  429,  357,    3,  166,   91,
 /*   750 */    91,   91,   91,  418,   89,   89,   89,   89,   88,   88,
 /*   760 */    87,   87,   87,   86,  339,  810,  434,  436,  435,  792,
 /*   770 */   320,  798,   76,   77,  789,  271,  123,  434,  360,   78,
 /*   780 */   340,  340,  864,   85,   82,  168,  953,    9,  395,  743,
 /*   790 */   360,  432,  253,  358,  252,  933,  933,  953,   30,  889,
 /*   800 */   327,  216,  803,  803,  803,  805,   18,  113,  418,   89,
 /*   810 */    89,   89,   89,   88,   88,   87,   87,   87,   86,  339,
 /*   820 */   810,  113,  436,  435,  792,  185,  798,  288,  388,  385,
 /*   830 */   384,  123,  113,  920,    2,  796,  696,  934,  935,  383,
 /*   840 */    69,  429,  434,    3,  218,  110,  738,  253,  358,  252,
 /*   850 */   434,  737,  933,  933,  892,  359,  222,  803,  803,  803,
 /*   860 */   805,   18,  953,   47,  933,  933,  933,  933,   76,   77,
 /*   870 */   953,    9,  366,  904,  217,   78,  340,  340,  677,  305,
 /*   880 */   304,  303,  206,  301,  224,  259,  664,  432,  337,  336,
 /*   890 */   434,  228,  247,  144,  934,  935,  933,  933,  667,  893,
 /*   900 */   324, 1259,   96,  434,  418,  796,  934,  935,  934,  935,
 /*   910 */   953,   48,  401,  148,  289,  894,  810,  417,  436,  435,
 /*   920 */   677,  759,  798,  953,    9,  314,  220,  162,  161,  170,
 /*   930 */   402,  239,  953,    8,  194,  683,  683,  410,  934,  935,
 /*   940 */   238,  959,  933,  933,  225,  408,  945,  365,  957,  212,
 /*   950 */   958,  172,  757,  803,  803,  803,  805,   18,  173,  365,
 /*   960 */   176,  123,  171,  113,  244,  952,  246,  434,  356,  796,
 /*   970 */   372,  365,  236,  960,  960,  810,  290,  804,  191,  165,
 /*   980 */   852,  798,  259,  316,  934,  935,  237,  953,   34,  404,
 /*   990 */    91,   91,   91,   91,   84,   89,   89,   89,   89,   88,
 /*  1000 */    88,   87,   87,   87,   86,  339,  701,  952,  434,  240,
 /*  1010 */   347,  758,  803,  803,  803,  434,  245, 1179,  434,  389,
 /*  1020 */   434,  376,  434,  895,  167,  434,  405,  702,  953,   35,
 /*  1030 */   673,  321,  221,  434,  333,  953,   11,  434,  953,   26,
 /*  1040 */   953,   36,  953,   37,  251,  953,   38,  434,  259,  434,
 /*  1050 */   757,  434,  329,  953,   27,  434,  223,  953,   28,  434,
 /*  1060 */   690,  434,   67,  434,   65,  434,  862,  953,   39,  953,
 /*  1070 */    40,  953,   41,  423,  434,  953,   10,  434,  772,  953,
 /*  1080 */    42,  953,   98,  953,   43,  953,   44,  773,  434,  346,
 /*  1090 */   434,   75,  434,   73,  953,   31,  434,  953,   45,  434,
 /*  1100 */   259,  434,  690,  434,  757,  434,  887,  434,  953,   46,
 /*  1110 */   953,   32,  953,  115,  434,  266,  953,  116,  951,  953,
 /*  1120 */   117,  953,   52,  953,   33,  953,   99,  953,   49,  726,
 /*  1130 */   434,  909,  434,   19,  953,  100,  434,  344,  434,  113,
 /*  1140 */   434,  258,  692,  434,  259,  434,  670,  434,   20,  434,
 /*  1150 */   953,  101,  953,   97,  434,  259,  953,  114,  953,  112,
 /*  1160 */   953,  105,  113,  953,  104,  953,  102,  953,  103,  953,
 /*  1170 */    51,  434,  148,  434,  953,   53,  167,  434,  259,  113,
 /*  1180 */   300,  307,  912,  363,  311,  860,  248,  261,  209,  264,
 /*  1190 */   416,  953,   50,  953,   25,  420,  727,  953,   29,  430,
 /*  1200 */   321,  424,  757,  428,  322,  124, 1269,  214,  165,  710,
 /*  1210 */   859,  908,  806,  794,  309,  158,  193,  361,  254,  723,
 /*  1220 */   364,   67,  381,  269,  735,  199,   67,   70,  113,  700,
 /*  1230 */   699,  707,  708,  884,  113,  766,  113,  855,  193,  883,
 /*  1240 */   199,  869,  869,  675,  868,  868,  109,  368,  255,  260,
 /*  1250 */   263,  280,  859,  265,  806,  974,  267,  711,  695,  272,
 /*  1260 */   764,  282,  795,  284,  150,  744,  755,  415,  292,  293,
 /*  1270 */   802,  678,  672,  661,  660,  662,  927,    6,  306,  386,
 /*  1280 */   352,  786,  243,  250,  886,  362,  163,  286,  419,  298,
 /*  1290 */   930,  159,  968,  196,  126,  903,  901,  965,   55,   58,
 /*  1300 */   323,  275,  857,  136,  147,  694,  856,  121,   65,  354,
 /*  1310 */   355,  379,  175,   61,  151,  369,  180,  871,  375,  129,
 /*  1320 */   257,  756,  210,  181,  145,  131,  132,  377,  262,  663,
 /*  1330 */   133,  134,  139,  783,  791,  182,  392,  183,  312,  330,
 /*  1340 */   714,  888,  713,  851,  692,  195,  712,  406,  686,  705,
 /*  1350 */   313,  685,   64,  839,  274,   72,  684,  334,  942,   95,
 /*  1360 */   752,  279,  281,  704,  753,  751,  422,  283,  411,  750,
 /*  1370 */   426,   66,  204,  409,   21,  285,  928,  669,  437,  205,
 /*  1380 */   207,  208,  438,  658,  657,  652,  118,  108,  119,  226,
 /*  1390 */   650,  341,  157,  235,  169,  345,  106,  734,  790,  296,
 /*  1400 */   294,  295,  120,  297,  867,  865,  127,  128,  130,  724,
 /*  1410 */   229,  174,  249,  882,  137,  230,  138,  135,  885,  231,
 /*  1420 */    59,   60,  177,  881,    7,  178,   12,  179,  256,  874,
 /*  1430 */   140,  193,  962,  374,  141,  152,  666,  378,  276,  184,
 /*  1440 */   270,  122,  142,  382,  387,   62,   13,   14,  703,   63,
 /*  1450 */   125,  317,  318,  227,  809,  808,  837,  732,   15,  164,
 /*  1460 */   736,    4,  765,  211,  399,  213,  192,  143,  760,   70,
 /*  1470 */    67,   16,   17,  838,  836,  891,  841,  890,  198,  197,
 /*  1480 */   917,  154,  421,  923,  918,  155,  200,  977,  425,  840,
 /*  1490 */   156,  201,  807,  676,   80,  302,  299,  977,  202, 1261,
 /*  1500 */  1260,
};
static const YYCODETYPE yy_lookahead[] = {
 /*     0 */    19,   95,   53,   97,   22,   24,   24,  101,   27,   28,
 /*    10 */    29,   30,   31,   32,   33,   34,   35,   36,   37,   38,
 /*    20 */    39,   40,   41,  152,   43,   44,   45,   46,   47,   48,
 /*    30 */    49,   50,   51,   52,   53,   19,   55,   55,  132,  133,
 /*    40 */   134,    1,    2,   27,   28,   29,   30,   31,   32,   33,
 /*    50 */    34,   35,   36,   37,   38,   39,   40,   41,   92,   43,
 /*    60 */    44,   45,   46,   47,   48,   49,   50,   51,   52,   53,
 /*    70 */    47,   48,   49,   50,   51,   52,   53,   61,   97,   97,
 /*    80 */    19,   49,   50,   51,   52,   53,   70,   26,   27,   28,
 /*    90 */    29,   30,   31,   32,   33,   34,   35,   36,   37,   38,
 /*   100 */    39,   40,   41,  152,   43,   44,   45,   46,   47,   48,
 /*   110 */    49,   50,   51,   52,   53,  144,  145,  146,  147,   19,
 /*   120 */   249,   22,  172,  172,  173,   52,   53,   27,   28,   29,
 /*   130 */    30,   31,   32,   33,   34,   35,   36,   37,   38,   39,
 /*   140 */    40,   41,   81,   43,   44,   45,   46,   47,   48,   49,
 /*   150 */    50,   51,   52,   53,   55,   56,   19,  152,  207,  208,
 /*   160 */   115,   24,  117,  118,   27,   28,   29,   30,   31,   32,
 /*   170 */    33,   34,   35,   36,   37,   38,   39,   40,   41,   79,
 /*   180 */    43,   44,   45,   46,   47,   48,   49,   50,   51,   52,
 /*   190 */    53,   19,    0,    1,    2,   23,   97,   98,  193,   27,
 /*   200 */    28,   29,   30,   31,   32,   33,   34,   35,   36,   37,
 /*   210 */    38,   39,   40,   41,  152,   43,   44,   45,   46,   47,
 /*   220 */    48,   49,   50,   51,   52,   53,   19,   22,   23,  172,
 /*   230 */    23,   26,  119,  120,   27,   28,   29,   30,   31,   32,
 /*   240 */    33,   34,   35,   36,   37,   38,   39,   40,   41,  187,
 /*   250 */    43,   44,   45,   46,   47,   48,   49,   50,   51,   52,
 /*   260 */    53,   19,  221,  222,  223,   23,  168,  169,  170,   27,
 /*   270 */    28,   29,   30,   31,   32,   33,   34,   35,   36,   37,
 /*   280 */    38,   39,   40,   41,  152,   43,   44,   45,   46,   47,
 /*   290 */    48,   49,   50,   51,   52,   53,   19,  157,   22,   23,
 /*   300 */    23,   96,   26,  172,   27,   28,   29,   30,   31,   32,
 /*   310 */    33,   34,   35,   36,   37,   38,   39,   40,   41,  187,
 /*   320 */    43,   44,   45,   46,   47,   48,   49,   50,   51,   52,
 /*   330 */    53,   19,  108,  109,  110,  221,  222,  223,  185,   27,
 /*   340 */    28,   29,   30,   31,   32,   33,   34,   35,   36,   37,
 /*   350 */    38,   39,   40,   41,  240,   43,   44,   45,   46,   47,
 /*   360 */    48,   49,   50,   51,   52,   53,   19,  227,   22,   23,
 /*   370 */   230,   22,   96,  152,   27,   28,   29,   30,   31,   32,
 /*   380 */    33,   34,   35,   36,   37,   38,   39,   40,   41,   30,
 /*   390 */    43,   44,   45,   46,   47,   48,   49,   50,   51,   52,
 /*   400 */    53,   19,  190,  191,   55,   56,   24,  190,  191,   27,
 /*   410 */    28,   29,   30,   31,   32,   33,   34,   35,   36,   37,
 /*   420 */    38,   39,   40,   41,  152,   43,   44,   45,   46,   47,
 /*   430 */    48,   49,   50,   51,   52,   53,  168,  169,  170,  179,
 /*   440 */   180,  171,   96,   19,  172,  173,   97,   98,  188,  179,
 /*   450 */   138,   27,   28,   29,   30,   31,   32,   33,   34,   35,
 /*   460 */    36,   37,   38,   39,   40,   41,  107,   43,   44,   45,
 /*   470 */    46,   47,   48,   49,   50,   51,   52,   53,   19,  207,
 /*   480 */   208,   30,   31,   32,   33,  138,   27,   28,   29,   30,
 /*   490 */    31,   32,   33,   34,   35,   36,   37,   38,   39,   40,
 /*   500 */    41,  181,   43,   44,   45,   46,   47,   48,   49,   50,
 /*   510 */    51,   52,   53,   19,  152,    7,    8,    9,   49,   22,
 /*   520 */    19,   24,   28,   29,   30,   31,   32,   33,   34,   35,
 /*   530 */    36,   37,   38,   39,   40,   41,  152,   43,   44,   45,
 /*   540 */    46,   47,   48,   49,   50,   51,   52,   53,   19,  108,
 /*   550 */   109,  110,  101,   55,   53,  193,  172,  173,   29,   30,
 /*   560 */    31,   32,   33,   34,   35,   36,   37,   38,   39,   40,
 /*   570 */    41,  152,   43,   44,   45,   46,   47,   48,   49,   50,
 /*   580 */    51,   52,   53,   19,   20,  116,   22,   23,  169,  170,
 /*   590 */   121,  207,   85,   55,   56,   97,   19,   20,  195,   22,
 /*   600 */    99,  100,  101,  102,  103,  104,  105,   12,  152,  206,
 /*   610 */   210,   47,   48,  112,  152,  108,  109,  110,   54,   55,
 /*   620 */    56,  221,  222,  223,   47,   48,  119,  120,  172,  173,
 /*   630 */    66,   54,   55,   56,  101,   97,   98,   99,  148,  149,
 /*   640 */   102,  103,  104,   66,  154,  112,  156,   83,  229,   47,
 /*   650 */    48,  113,   57,  163,  194,  195,   92,  246,  247,   95,
 /*   660 */    83,   97,   98,  207,  208,  101,  206,   59,   73,   92,
 /*   670 */    75,   63,   95,  163,   97,   98,  194,  195,  101,  219,
 /*   680 */    85,  181,   19,  152,  175,   77,  196,  152,  206,   19,
 /*   690 */    20,  199,   22,   30,  163,   11,  132,  133,  134,  135,
 /*   700 */   136,  209,  152,  172,  173,  152,  196,  172,  173,  132,
 /*   710 */   133,  134,  135,  136,  164,   92,  213,   47,   48,   49,
 /*   720 */    92,  186,  169,  170,   54,   55,   56,  196,  100,  219,
 /*   730 */   221,  222,  223,  243,  132,  133,   66,  175,  207,  208,
 /*   740 */   152,  231,  119,  120,   19,   20,  236,   22,  152,   38,
 /*   750 */    39,   40,   41,   83,   43,   44,   45,   46,   47,   48,
 /*   760 */    49,   50,   51,   52,   53,   95,  152,   97,   98,   85,
 /*   770 */   107,  101,   47,   48,  163,  112,   92,  152,  152,   54,
 /*   780 */    55,   56,  229,  221,  222,  223,  172,  173,  163,   49,
 /*   790 */   152,   66,  108,  109,  110,   55,   56,  172,  173,  163,
 /*   800 */   186,   22,  132,  133,  134,  135,  136,  196,   83,   43,
 /*   810 */    44,   45,   46,   47,   48,   49,   50,   51,   52,   53,
 /*   820 */    95,  196,   97,   98,   85,   99,  101,  152,  102,  103,
 /*   830 */   104,   92,  196,  146,  147,  152,  181,   97,   98,  113,
 /*   840 */    19,   20,  152,   22,  218,   22,  116,  108,  109,  110,
 /*   850 */   152,  121,   55,   56,   12,  219,  218,  132,  133,  134,
 /*   860 */   135,  136,  172,  173,   55,   56,   55,   56,   47,   48,
 /*   870 */   172,  173,  236,  152,    5,   54,   55,   56,   55,   10,
 /*   880 */    11,   12,   13,   14,  186,  152,   17,   66,   47,   48,
 /*   890 */   152,  210,   16,   84,   97,   98,   55,   56,   21,   57,
 /*   900 */   217,  122,   22,  152,   83,  152,   97,   98,   97,   98,
 /*   910 */   172,  173,  152,  152,  224,   73,   95,   75,   97,   98,
 /*   920 */    97,  124,  101,  172,  173,  164,  193,   47,   48,   60,
 /*   930 */   163,   62,  172,  173,   24,   55,   56,  186,   97,   98,
 /*   940 */    71,  100,   55,   56,  183,  207,  185,  152,  107,   23,
 /*   950 */   109,   82,   26,  132,  133,  134,  135,  136,   89,  152,
 /*   960 */    26,   92,   93,  196,   88,   55,   90,  152,   91,  152,
 /*   970 */   217,  152,  152,  132,  133,   95,  152,   97,  211,  212,
 /*   980 */   103,  101,  152,  114,   97,   98,  152,  172,  173,   19,
 /*   990 */    38,   39,   40,   41,   42,   43,   44,   45,   46,   47,
 /*  1000 */    48,   49,   50,   51,   52,   53,   65,   97,  152,  152,
 /*  1010 */   141,  124,  132,  133,  134,  152,  140,  140,  152,   78,
 /*  1020 */   152,  233,  152,  193,   98,  152,   56,   86,  172,  173,
 /*  1030 */   166,  167,  237,  152,  217,  172,  173,  152,  172,  173,
 /*  1040 */   172,  173,  172,  173,  237,  172,  173,  152,  152,  152,
 /*  1050 */   124,  152,  111,  172,  173,  152,  237,  172,  173,  152,
 /*  1060 */    55,  152,   26,  152,  130,  152,  152,  172,  173,  172,
 /*  1070 */   173,  172,  173,  249,  152,  172,  173,  152,   61,  172,
 /*  1080 */   173,  172,  173,  172,  173,  172,  173,   70,  152,  193,
 /*  1090 */   152,  137,  152,  139,  172,  173,  152,  172,  173,  152,
 /*  1100 */   152,  152,   97,  152,   26,  152,  163,  152,  172,  173,
 /*  1110 */   172,  173,  172,  173,  152,   16,  172,  173,   26,  172,
 /*  1120 */   173,  172,  173,  172,  173,  172,  173,  172,  173,  163,
 /*  1130 */   152,  152,  152,   22,  172,  173,  152,  241,  152,  196,
 /*  1140 */   152,  193,  106,  152,  152,  152,  163,  152,   37,  152,
 /*  1150 */   172,  173,  172,  173,  152,  152,  172,  173,  172,  173,
 /*  1160 */   172,  173,  196,  172,  173,  172,  173,  172,  173,  172,
 /*  1170 */   173,  152,  152,  152,  172,  173,   98,  152,  152,  196,
 /*  1180 */   160,   22,   23,   19,  164,  193,  152,   88,  232,   90,
 /*  1190 */   191,  172,  173,  172,  173,  163,  193,  172,  173,  166,
 /*  1200 */   167,  163,  124,  163,  244,  245,   23,  211,  212,   26,
 /*  1210 */    55,   23,   55,   23,   26,  123,   26,  152,   23,  193,
 /*  1220 */    56,   26,   23,   23,   23,   26,   26,   26,  196,  100,
 /*  1230 */   101,    7,    8,  152,  196,   23,  196,   23,   26,  152,
 /*  1240 */    26,  132,  133,   23,  132,  133,   26,  152,  152,  152,
 /*  1250 */   152,  210,   97,  152,   97,   96,  152,  152,  152,  152,
 /*  1260 */   152,  210,  152,  210,  197,  152,  152,  152,  152,  152,
 /*  1270 */   152,  152,  152,  152,  152,  152,  152,  198,  150,  176,
 /*  1280 */   214,  201,  214,  238,  201,  238,  184,  214,  226,  200,
 /*  1290 */   155,  198,   67,  122,  242,  159,  159,   69,  239,  239,
 /*  1300 */   159,  175,  175,   22,  220,  180,  175,   27,  130,   18,
 /*  1310 */   159,   18,  158,  137,  220,  159,  158,  235,   74,  189,
 /*  1320 */   234,  159,  159,  158,   22,  192,  192,  177,  159,  159,
 /*  1330 */   192,  192,  189,  201,  189,  158,  107,  158,  177,   76,
 /*  1340 */   174,  201,  174,  201,  106,  159,  174,  125,  174,  182,
 /*  1350 */   177,  176,  107,  159,  174,  137,  174,   53,  174,  129,
 /*  1360 */   216,  215,  215,  182,  216,  216,  177,  215,  126,  216,
 /*  1370 */   177,  128,   25,  127,   26,  215,   13,  162,  161,  153,
 /*  1380 */   153,    6,  151,  151,  151,  151,  165,  178,  165,  178,
 /*  1390 */     4,    3,   22,  142,   15,   94,   16,  205,  120,  202,
 /*  1400 */   204,  203,  165,  201,   23,   23,  131,  111,  123,   20,
 /*  1410 */   225,  125,   16,    1,  131,  228,  111,  123,   56,  228,
 /*  1420 */    37,   37,   64,    1,    5,  122,   22,  107,  140,   80,
 /*  1430 */    80,   26,   87,   72,  107,   24,   20,   19,  112,  105,
 /*  1440 */    23,   68,   22,   79,   79,   22,   22,   22,   58,   22,
 /*  1450 */   245,  248,  248,   79,   23,   23,   23,  116,   22,  122,
 /*  1460 */    23,   22,   56,   23,   26,   23,   64,   22,  124,   26,
 /*  1470 */    26,   64,   64,   23,   23,   23,   11,   23,   22,   26,
 /*  1480 */    23,   22,   24,    1,   23,   22,   26,  250,   24,   23,
 /*  1490 */    22,  122,   23,   23,   22,   15,   23,  250,  122,  122,
 /*  1500 */   122,
};
#define YY_SHIFT_USE_DFLT (-95)
#define YY_SHIFT_COUNT (439)
#define YY_SHIFT_MIN   (-94)
#define YY_SHIFT_MAX   (1482)
static const short yy_shift_ofst[] = {
 /*     0 */    40,  564,  869,  577,  725,  725,  725,  739,  -19,   16,
 /*    10 */    16,  100,  725,  725,  725,  725,  725,  725,  725,  841,
 /*    20 */   841,  538,  507,  684,  623,   61,  137,  172,  207,  242,
 /*    30 */   277,  312,  347,  382,  424,  424,  424,  424,  424,  424,
 /*    40 */   424,  424,  424,  424,  424,  424,  424,  424,  424,  459,
 /*    50 */   424,  494,  529,  529,  670,  725,  725,  725,  725,  725,
 /*    60 */   725,  725,  725,  725,  725,  725,  725,  725,  725,  725,
 /*    70 */   725,  725,  725,  725,  725,  725,  725,  725,  725,  725,
 /*    80 */   725,  725,  725,  821,  725,  725,  725,  725,  725,  725,
 /*    90 */   725,  725,  725,  725,  725,  725,  725,  952,  711,  711,
 /*   100 */   711,  711,  711,  766,   23,   32,  811,  877,  663,  602,
 /*   110 */   602,  811,   73,  113,  -51,  -95,  -95,  -95,  501,  501,
 /*   120 */   501,  595,  595,  809,  205,  276,  811,  811,  811,  811,
 /*   130 */   811,  811,  811,  811,  811,  811,  811,  811,  811,  811,
 /*   140 */   811,  811,  811,  811,  811,  811,  192,  628,  498,  498,
 /*   150 */   113,  -34,  -34,  -34,  -34,  -34,  -34,  -95,  -95,  -95,
 /*   160 */   880,  -94,  -94,  726,  740,   99,  797,  887,  349,  811,
 /*   170 */   811,  811,  811,  811,  811,  811,  811,  811,  811,  811,
 /*   180 */   811,  811,  811,  811,  811,  811,  941,  941,  941,  811,
 /*   190 */   811,  926,  811,  811,  811,  -18,  811,  811,  842,  811,
 /*   200 */   811,  811,  811,  811,  811,  811,  811,  811,  811,  224,
 /*   210 */   608,  910,  910,  910, 1078,   45,  469,  508,  934,  970,
 /*   220 */   970, 1164,  934, 1164, 1036, 1183,  359, 1017,  970,  954,
 /*   230 */  1017, 1017, 1092,  730,  497, 1225, 1171, 1171, 1228, 1228,
 /*   240 */  1171, 1281, 1280, 1178, 1291, 1291, 1291, 1291, 1171, 1293,
 /*   250 */  1178, 1281, 1280, 1280, 1178, 1171, 1293, 1176, 1244, 1171,
 /*   260 */  1171, 1293, 1302, 1171, 1293, 1171, 1293, 1302, 1229, 1229,
 /*   270 */  1229, 1263, 1302, 1229, 1238, 1229, 1263, 1229, 1229, 1222,
 /*   280 */  1245, 1222, 1245, 1222, 1245, 1222, 1245, 1171, 1171, 1218,
 /*   290 */  1302, 1304, 1304, 1302, 1230, 1242, 1243, 1246, 1178, 1347,
 /*   300 */  1348, 1363, 1363, 1375, 1375, 1375, 1375,  -95,  -95,  -95,
 /*   310 */   -95,  -95,  -95,  -95,  -95,  451,  876,  346, 1159, 1099,
 /*   320 */   441,  823, 1188, 1111, 1190, 1195, 1199, 1200, 1005, 1129,
 /*   330 */  1224,  533, 1201, 1212, 1155, 1214, 1109, 1112, 1220, 1157,
 /*   340 */   779, 1386, 1388, 1370, 1251, 1379, 1301, 1380, 1381, 1382,
 /*   350 */  1278, 1275, 1296, 1285, 1389, 1286, 1396, 1412, 1294, 1283,
 /*   360 */  1383, 1384, 1305, 1362, 1358, 1303, 1422, 1419, 1404, 1320,
 /*   370 */  1288, 1349, 1405, 1350, 1345, 1361, 1327, 1411, 1416, 1418,
 /*   380 */  1326, 1334, 1420, 1364, 1423, 1424, 1417, 1425, 1365, 1390,
 /*   390 */  1427, 1374, 1373, 1431, 1432, 1433, 1341, 1436, 1437, 1439,
 /*   400 */  1438, 1337, 1440, 1442, 1406, 1402, 1445, 1344, 1443, 1407,
 /*   410 */  1444, 1408, 1443, 1450, 1451, 1452, 1453, 1454, 1456, 1465,
 /*   420 */  1457, 1459, 1458, 1460, 1461, 1463, 1464, 1460, 1466, 1468,
 /*   430 */  1469, 1470, 1472, 1369, 1376, 1377, 1378, 1473, 1480, 1482,
};
#define YY_REDUCE_USE_DFLT (-130)
#define YY_REDUCE_COUNT (314)
#define YY_REDUCE_MIN   (-129)
#define YY_REDUCE_MAX   (1237)
static const short yy_reduce_ofst[] = {
 /*     0 */   -29,  531,  490,  625,  -49,  272,  456,  510,  400,  509,
 /*    10 */   562,  114,  535,  614,  698,  384,  738,  751,  690,  419,
 /*    20 */   553,  761,  460,  636,  767,   41,   41,   41,   41,   41,
 /*    30 */    41,   41,   41,   41,   41,   41,   41,   41,   41,   41,
 /*    40 */    41,   41,   41,   41,   41,   41,   41,   41,   41,   41,
 /*    50 */    41,   41,   41,   41,  760,  815,  856,  863,  866,  868,
 /*    60 */   870,  873,  881,  885,  895,  897,  899,  903,  907,  909,
 /*    70 */   911,  913,  922,  925,  936,  938,  940,  944,  947,  949,
 /*    80 */   951,  953,  955,  962,  978,  980,  984,  986,  988,  991,
 /*    90 */   993,  995,  997, 1002, 1019, 1021, 1025,   41,   41,   41,
 /*   100 */    41,   41,   41,   41,   41,   41,  896,  140,  260,   98,
 /*   110 */   268, 1020,   41,  482,   41,   41,   41,   41,  270,  270,
 /*   120 */   270,  212,  217, -129,  411,  411,  550,    5,  626,  362,
 /*   130 */   733,  830,  992, 1003, 1026,  795,  683,  807,  638,  819,
 /*   140 */   753,  948,   62,  817,  824,  132,  687,  611,  864, 1033,
 /*   150 */   403,  943,  966,  983, 1032, 1038, 1040,  960,  996,  492,
 /*   160 */   -50,   57,  131,  153,  221,  462,  588,  596,  675,  721,
 /*   170 */   820,  834,  857,  914,  979, 1034, 1065, 1081, 1087, 1095,
 /*   180 */  1096, 1097, 1098, 1101, 1104, 1105,  320,  500,  655, 1106,
 /*   190 */  1107,  503, 1108, 1110, 1113,  681, 1114, 1115,  999, 1116,
 /*   200 */  1117, 1118,  221, 1119, 1120, 1121, 1122, 1123, 1124,  788,
 /*   210 */   956, 1041, 1051, 1053,  503, 1067, 1079, 1128, 1080, 1066,
 /*   220 */  1068, 1045, 1083, 1047, 1103, 1102, 1125, 1126, 1073, 1062,
 /*   230 */  1127, 1131, 1089, 1093, 1135, 1052, 1136, 1137, 1059, 1060,
 /*   240 */  1141, 1084, 1130, 1132, 1133, 1134, 1138, 1139, 1151, 1154,
 /*   250 */  1140, 1094, 1143, 1145, 1142, 1156, 1158, 1082, 1086, 1162,
 /*   260 */  1163, 1165, 1150, 1169, 1177, 1170, 1179, 1161, 1166, 1168,
 /*   270 */  1172, 1167, 1173, 1174, 1175, 1180, 1181, 1182, 1184, 1144,
 /*   280 */  1146, 1148, 1147, 1149, 1152, 1153, 1160, 1186, 1194, 1185,
 /*   290 */  1189, 1187, 1191, 1193, 1192, 1196, 1198, 1197, 1202, 1215,
 /*   300 */  1217, 1226, 1227, 1231, 1232, 1233, 1234, 1203, 1204, 1205,
 /*   310 */  1221, 1223, 1209, 1211, 1237,
};
static const YYACTIONTYPE yy_default[] = {
 /*     0 */  1250, 1240, 1240, 1240, 1174, 1174, 1174, 1240, 1071, 1100,
 /*    10 */  1100, 1224, 1301, 1301, 1301, 1301, 1301, 1301, 1173, 1301,
 /*    20 */  1301, 1301, 1301, 1240, 1075, 1106, 1301, 1301, 1301, 1301,
 /*    30 */  1301, 1301, 1301, 1301, 1223, 1225, 1114, 1113, 1206, 1087,
 /*    40 */  1111, 1104, 1108, 1175, 1169, 1170, 1168, 1172, 1176, 1301,
................................................................................
** to revert to identifiers if they keyword does not apply in the context where
** it appears.
*/
#ifdef YYFALLBACK
static const YYCODETYPE yyFallback[] = {
    0,  /*          $ => nothing */
    0,  /*       SEMI => nothing */
   55,  /*    EXPLAIN => ID */
   55,  /*      QUERY => ID */
   55,  /*       PLAN => ID */
   55,  /*      BEGIN => ID */
    0,  /* TRANSACTION => nothing */
   55,  /*   DEFERRED => ID */
   55,  /*  IMMEDIATE => ID */
   55,  /*  EXCLUSIVE => ID */
    0,  /*     COMMIT => nothing */
   55,  /*        END => ID */
   55,  /*   ROLLBACK => ID */
   55,  /*  SAVEPOINT => ID */
   55,  /*    RELEASE => ID */
    0,  /*         TO => nothing */
    0,  /*      TABLE => nothing */
    0,  /*     CREATE => nothing */
   55,  /*         IF => ID */
    0,  /*        NOT => nothing */
    0,  /*     EXISTS => nothing */
   55,  /*       TEMP => ID */
    0,  /*         LP => nothing */
    0,  /*         RP => nothing */
    0,  /*         AS => nothing */
   55,  /*    WITHOUT => ID */
    0,  /*      COMMA => nothing */
    0,  /*         OR => nothing */
    0,  /*        AND => nothing */
    0,  /*         IS => nothing */
   55,  /*      MATCH => ID */
   55,  /*    LIKE_KW => ID */
    0,  /*    BETWEEN => nothing */
    0,  /*         IN => nothing */
    0,  /*     ISNULL => nothing */
    0,  /*    NOTNULL => nothing */
    0,  /*         NE => nothing */
    0,  /*         EQ => nothing */
    0,  /*         GT => nothing */
    0,  /*         LE => nothing */
    0,  /*         LT => nothing */
    0,  /*         GE => nothing */
    0,  /*     ESCAPE => nothing */
    0,  /*     BITAND => nothing */
    0,  /*      BITOR => nothing */
    0,  /*     LSHIFT => nothing */
    0,  /*     RSHIFT => nothing */
    0,  /*       PLUS => nothing */
    0,  /*      MINUS => nothing */
    0,  /*       STAR => nothing */
    0,  /*      SLASH => nothing */
    0,  /*        REM => nothing */
    0,  /*     CONCAT => nothing */
    0,  /*    COLLATE => nothing */
    0,  /*     BITNOT => nothing */
    0,  /*         ID => nothing */
    0,  /*    INDEXED => nothing */
   55,  /*      ABORT => ID */
   55,  /*     ACTION => ID */
   55,  /*      AFTER => ID */
   55,  /*    ANALYZE => ID */
   55,  /*        ASC => ID */
   55,  /*     ATTACH => ID */
   55,  /*     BEFORE => ID */
   55,  /*         BY => ID */
   55,  /*    CASCADE => ID */
   55,  /*       CAST => ID */
   55,  /*   COLUMNKW => ID */
   55,  /*   CONFLICT => ID */
   55,  /*   DATABASE => ID */
   55,  /*       DESC => ID */
   55,  /*     DETACH => ID */
   55,  /*       EACH => ID */
   55,  /*       FAIL => ID */
   55,  /*        FOR => ID */
   55,  /*     IGNORE => ID */
   55,  /*  INITIALLY => ID */
   55,  /*    INSTEAD => ID */


   55,  /*         NO => ID */
   55,  /*        KEY => ID */
   55,  /*         OF => ID */
   55,  /*     OFFSET => ID */
   55,  /*     PRAGMA => ID */
   55,  /*      RAISE => ID */
   55,  /*  RECURSIVE => ID */
   55,  /*    REPLACE => ID */
   55,  /*   RESTRICT => ID */
   55,  /*        ROW => ID */
   55,  /*    TRIGGER => ID */
   55,  /*     VACUUM => ID */
   55,  /*       VIEW => ID */
   55,  /*    VIRTUAL => ID */
   55,  /*       WITH => ID */
   55,  /*    REINDEX => ID */
   55,  /*     RENAME => ID */
   55,  /*   CTIME_KW => ID */
};
#endif /* YYFALLBACK */

/* The following structure represents a single element of the
** parser's stack.  Information stored includes:
**
**   +  The state number for the parser at this level of the stack.
................................................................................
static const char *const yyTokenName[] = { 
  "$",             "SEMI",          "EXPLAIN",       "QUERY",       
  "PLAN",          "BEGIN",         "TRANSACTION",   "DEFERRED",    
  "IMMEDIATE",     "EXCLUSIVE",     "COMMIT",        "END",         
  "ROLLBACK",      "SAVEPOINT",     "RELEASE",       "TO",          
  "TABLE",         "CREATE",        "IF",            "NOT",         
  "EXISTS",        "TEMP",          "LP",            "RP",          
  "AS",            "WITHOUT",       "COMMA",         "OR",          
  "AND",           "IS",            "MATCH",         "LIKE_KW",     
  "BETWEEN",       "IN",            "ISNULL",        "NOTNULL",     
  "NE",            "EQ",            "GT",            "LE",          
  "LT",            "GE",            "ESCAPE",        "BITAND",      
  "BITOR",         "LSHIFT",        "RSHIFT",        "PLUS",        
  "MINUS",         "STAR",          "SLASH",         "REM",         
  "CONCAT",        "COLLATE",       "BITNOT",        "ID",          
  "INDEXED",       "ABORT",         "ACTION",        "AFTER",       
  "ANALYZE",       "ASC",           "ATTACH",        "BEFORE",      
  "BY",            "CASCADE",       "CAST",          "COLUMNKW",    
  "CONFLICT",      "DATABASE",      "DESC",          "DETACH",      
  "EACH",          "FAIL",          "FOR",           "IGNORE",      
  "INITIALLY",     "INSTEAD",       "NO",            "KEY",         
  "OF",            "OFFSET",        "PRAGMA",        "RAISE",       
  "RECURSIVE",     "REPLACE",       "RESTRICT",      "ROW",         
  "TRIGGER",       "VACUUM",        "VIEW",          "VIRTUAL",     
  "WITH",          "REINDEX",       "RENAME",        "CTIME_KW",    







  "ANY",           "STRING",        "JOIN_KW",       "CONSTRAINT",  
  "DEFAULT",       "NULL",          "PRIMARY",       "UNIQUE",      
  "CHECK",         "REFERENCES",    "AUTOINCR",      "ON",          
  "INSERT",        "DELETE",        "UPDATE",        "SET",         
  "DEFERRABLE",    "FOREIGN",       "DROP",          "UNION",       
  "ALL",           "EXCEPT",        "INTERSECT",     "SELECT",      
  "VALUES",        "DISTINCT",      "DOT",           "FROM",        
  "JOIN",          "USING",         "ORDER",         "GROUP",       
................................................................................
  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);
  spanSet(&yymsp[-4].minor.yy342,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-X*/
  yymsp[-4].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);
}
        break;
      case 156: /* expr ::= VARIABLE */
{

  if( !(yymsp[0].minor.yy0.z[0]=='#' && sqlite3Isdigit(yymsp[0].minor.yy0.z[1])) ){
    spanExpr(&yymsp[0].minor.yy342, pParse, TK_VARIABLE, yymsp[0].minor.yy0);
    sqlite3ExprAssignVarNumber(pParse, yymsp[0].minor.yy342.pExpr);
  }else{
    /* When doing a nested parse, one can include terms in an expression
    ** that look like this:   #1 #2 ...  These terms refer to registers
    ** in the virtual machine.  #N is the N-th register. */
    Token t = yymsp[0].minor.yy0; /*A-overwrites-X*/
    assert( t.n>=2 );
    spanSet(&yymsp[0].minor.yy342, &t, &t);
    if( pParse->nested==0 ){
      sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &t);
      yymsp[0].minor.yy342.pExpr = 0;
    }else{
      yymsp[0].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_REGISTER, 0, 0, &t);
      if( yymsp[0].minor.yy342.pExpr ) sqlite3GetInt32(&t.z[1], &yymsp[0].minor.yy342.pExpr->iTable);
    }



  }
}
        break;
      case 157: /* expr ::= expr COLLATE ID|STRING */
{
  yymsp[-2].minor.yy342.pExpr = sqlite3ExprAddCollateToken(pParse, yymsp[-2].minor.yy342.pExpr, &yymsp[0].minor.yy0, 1);
  yymsp[-2].minor.yy342.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
................................................................................
    yymsp[-4].minor.yy342.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
  }
        break;
      case 188: /* expr ::= LP select RP */
{
    spanSet(&yymsp[-2].minor.yy342,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-B*/
    yymsp[-2].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_SELECT, 0, 0, 0);
    sqlite3PExprAddSelect(pParse, yymsp[-2].minor.yy342.pExpr, yymsp[-1].minor.yy159);






  }
        break;
      case 189: /* expr ::= expr in_op LP select RP */
{
    yymsp[-4].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy342.pExpr, 0, 0);
    sqlite3PExprAddSelect(pParse, yymsp[-4].minor.yy342.pExpr, yymsp[-1].minor.yy159);






    exprNot(pParse, yymsp[-3].minor.yy392, &yymsp[-4].minor.yy342);
    yymsp[-4].minor.yy342.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
  }
        break;
      case 190: /* expr ::= expr in_op nm dbnm */
{
    SrcList *pSrc = sqlite3SrcListAppend(pParse->db, 0,&yymsp[-1].minor.yy0,&yymsp[0].minor.yy0);
    Select *pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0,0);
    yymsp[-3].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-3].minor.yy342.pExpr, 0, 0);
    sqlite3PExprAddSelect(pParse, yymsp[-3].minor.yy342.pExpr, pSelect);






    exprNot(pParse, yymsp[-2].minor.yy392, &yymsp[-3].minor.yy342);
    yymsp[-3].minor.yy342.zEnd = yymsp[0].minor.yy0.z ? &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n] : &yymsp[-1].minor.yy0.z[yymsp[-1].minor.yy0.n];
  }
        break;
      case 191: /* expr ::= EXISTS LP select RP */
{
    Expr *p;
    spanSet(&yymsp[-3].minor.yy342,&yymsp[-3].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-B*/
    p = yymsp[-3].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_EXISTS, 0, 0, 0);

    sqlite3PExprAddSelect(pParse, p, yymsp[-1].minor.yy159);





  }
        break;
      case 192: /* expr ::= CASE case_operand case_exprlist case_else END */
{
  spanSet(&yymsp[-4].minor.yy342,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0);  /*A-overwrites-C*/
  yymsp[-4].minor.yy342.pExpr = sqlite3PExpr(pParse, TK_CASE, yymsp[-3].minor.yy122, 0, 0);
  if( yymsp[-4].minor.yy342.pExpr ){
................................................................................
    /* If the pParse->declareVtab flag is set, do not delete any table 
    ** structure built up in pParse->pNewTable. The calling code (see vtab.c)
    ** will take responsibility for freeing the Table structure.
    */
    sqlite3DeleteTable(db, pParse->pNewTable);
  }

  if( pParse->pWithToFree ) sqlite3WithDelete(db, pParse->pWithToFree);
  sqlite3DeleteTrigger(db, pParse->pNewTrigger);
  for(i=pParse->nzVar-1; i>=0; i--) sqlite3DbFree(db, pParse->azVar[i]);
  sqlite3DbFree(db, pParse->azVar);
  while( pParse->pAinc ){
    AutoincInfo *p = pParse->pAinc;
    pParse->pAinc = p->pNext;
    sqlite3DbFree(db, p);
................................................................................
      static const struct {
        int op;      /* The opcode */
        u32 mask;    /* Mask of the bit in sqlite3.flags to set/clear */
      } aFlagOp[] = {
        { SQLITE_DBCONFIG_ENABLE_FKEY,           SQLITE_ForeignKeys    },
        { SQLITE_DBCONFIG_ENABLE_TRIGGER,        SQLITE_EnableTrigger  },
        { SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, SQLITE_Fts3Tokenizer  },
        { SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, SQLITE_LoadExtension  },
      };
      unsigned int i;
      rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
      for(i=0; i<ArraySize(aFlagOp); i++){
        if( aFlagOp[i].op==op ){
          int onoff = va_arg(ap, int);
          int *pRes = va_arg(ap, int*);
................................................................................
**
**     lower('I', 'en_us') -> 'i'
**     lower('I', 'tr_tr') -> 'ı' (small dotless i)
**
** http://www.icu-project.org/userguide/posix.html#case_mappings
*/
static void icuCaseFunc16(sqlite3_context *p, int nArg, sqlite3_value **apArg){
  const UChar *zInput;            /* Pointer to input string */
  UChar *zOutput = 0;             /* Pointer to output buffer */
  int nInput;                     /* Size of utf-16 input string in bytes */
  int nOut;                       /* Size of output buffer in bytes */
  int cnt;
  int bToUpper;                   /* True for toupper(), false for tolower() */
  UErrorCode status;
  const char *zLocale = 0;

  assert(nArg==1 || nArg==2);
  bToUpper = (sqlite3_user_data(p)!=0);
  if( nArg==2 ){
    zLocale = (const char *)sqlite3_value_text(apArg[1]);
  }

  zInput = sqlite3_value_text16(apArg[0]);
  if( !zInput ){
    return;
................................................................................
    if( zNew==0 ){
      sqlite3_free(zOutput);
      sqlite3_result_error_nomem(p);
      return;
    }
    zOutput = zNew;
    status = U_ZERO_ERROR;
    if( bToUpper ){
      nOut = 2*u_strToUpper(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
    }else{
      nOut = 2*u_strToLower(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
    }

    if( U_SUCCESS(status) ){
      sqlite3_result_text16(p, zOutput, nOut, xFree);
    }else if( status==U_BUFFER_OVERFLOW_ERROR ){

      assert( cnt==0 );
      continue;
    }else{
      icuFunctionError(p, bToUpper ? "u_strToUpper" : "u_strToLower", status);
    }
    return;
  }


  assert( 0 );     /* Unreachable */
}

/*
** Collation sequence destructor function. The pCtx argument points to
** a UCollator structure previously allocated using ucol_open().
*/
static void icuCollationDel(void *pCtx){
................................................................................
*/
SQLITE_API sqlite3rbu *SQLITE_STDCALL sqlite3rbu_open(
  const char *zTarget, 
  const char *zRbu,
  const char *zState
);

/*
** Open an RBU handle to perform an RBU vacuum on database file zTarget.
** An RBU vacuum is similar to SQLite's built-in VACUUM command, except
** that it can be suspended and resumed like an RBU update.
**
** The second argument to this function, which may not be NULL, identifies 
** a database in which to store the state of the RBU vacuum operation if
** it is suspended. The first time sqlite3rbu_vacuum() is called, to start
** an RBU vacuum operation, the state database should either not exist or
** be empty (contain no tables). If an RBU vacuum is suspended by calling
** sqlite3rbu_close() on the RBU handle before sqlite3rbu_step() has
** returned SQLITE_DONE, the vacuum state is stored in the state database. 
** The vacuum can be resumed by calling this function to open a new RBU
** handle specifying the same target and state databases.
**
** This function does not delete the state database after an RBU vacuum
** is completed, even if it created it. However, if the call to
** sqlite3rbu_close() returns any value other than SQLITE_OK, the contents
** of the state tables within the state database are zeroed. This way,
** the next call to sqlite3rbu_vacuum() opens a handle that starts a 
** new RBU vacuum operation.
**
** As with sqlite3rbu_open(), Zipvfs users should rever to the comment
** describing the sqlite3rbu_create_vfs() API function below for 
** a description of the complications associated with using RBU with 
** zipvfs databases.
*/
SQLITE_API sqlite3rbu *SQLITE_STDCALL sqlite3rbu_vacuum(
  const char *zTarget, 
  const char *zState
);

/*
** Internally, each RBU connection uses a separate SQLite database 
** connection to access the target and rbu update databases. This
** API allows the application direct access to these database handles.
**
** The first argument passed to this function must be a valid, open, RBU
** handle. The second argument should be passed zero to access the target
................................................................................
typedef struct RbuState RbuState;
typedef struct rbu_vfs rbu_vfs;
typedef struct rbu_file rbu_file;
typedef struct RbuUpdateStmt RbuUpdateStmt;

#if !defined(SQLITE_AMALGAMATION)
typedef unsigned int u32;
typedef unsigned short u16;
typedef unsigned char u8;
typedef sqlite3_int64 i64;
#endif

/*
** These values must match the values defined in wal.c for the equivalent
** locks. These are not magic numbers as they are part of the SQLite file
** format.
*/
#define WAL_LOCK_WRITE  0
#define WAL_LOCK_CKPT   1
#define WAL_LOCK_READ0  3

#define SQLITE_FCNTL_RBUCNT    5149216

/*
** A structure to store values read from the rbu_state table in memory.
*/
struct RbuState {
  int eStage;
  char *zTbl;
................................................................................
  u32 mLock;
  int nFrame;                     /* Entries in aFrame[] array */
  int nFrameAlloc;                /* Allocated size of aFrame[] array */
  RbuFrame *aFrame;
  int pgsz;
  u8 *aBuf;
  i64 iWalCksum;

  /* Used in RBU vacuum mode only */
  int nRbu;                       /* Number of RBU VFS in the stack */
  rbu_file *pRbuFd;               /* Fd for main db of dbRbu */
};

/*
** An rbu VFS is implemented using an instance of this structure.
*/
struct rbu_vfs {
  sqlite3_vfs base;               /* rbu VFS shim methods */
................................................................................
  sqlite3_file *pReal;            /* Underlying file handle */
  rbu_vfs *pRbuVfs;               /* Pointer to the rbu_vfs object */
  sqlite3rbu *pRbu;               /* Pointer to rbu object (rbu target only) */

  int openFlags;                  /* Flags this file was opened with */
  u32 iCookie;                    /* Cookie value for main db files */
  u8 iWriteVer;                   /* "write-version" value for main db files */
  u8 bNolock;                     /* True to fail EXCLUSIVE locks */

  int nShm;                       /* Number of entries in apShm[] array */
  char **apShm;                   /* Array of mmap'd *-shm regions */
  char *zDel;                     /* Delete this when closing file */

  const char *zWal;               /* Wal filename for this main db file */
  rbu_file *pWalFd;               /* Wal file descriptor for this main db */
  rbu_file *pMainNext;            /* Next MAIN_DB file */
};

/*
** True for an RBU vacuum handle, or false otherwise.
*/
#define rbuIsVacuum(p) ((p)->zTarget==0)


/*************************************************************************
** The following three functions, found below:
**
**   rbuDeltaGetInt()
**   rbuDeltaChecksum()
**   rbuDeltaApply()
................................................................................
  }
  return rc;
}


/*
** The implementation of the rbu_target_name() SQL function. This function
** accepts one or two arguments. The first argument is the name of a table -
** the name of a table in the RBU database.  The second, if it is present, is 1
** for a view or 0 for a table. 
**
** For a non-vacuum RBU handle, if the table name matches the pattern:
**
**     data[0-9]_<name>
**
** where <name> is any sequence of 1 or more characters, <name> is returned.
** Otherwise, if the only argument does not match the above pattern, an SQL
** NULL is returned.
**
**     "data_t1"     -> "t1"
**     "data0123_t2" -> "t2"
**     "dataAB_t3"   -> NULL
**
** For an rbu vacuum handle, a copy of the first argument is returned if
** the second argument is either missing or 0 (not a view).
*/
static void rbuTargetNameFunc(
  sqlite3_context *pCtx,
  int argc,
  sqlite3_value **argv
){
  sqlite3rbu *p = sqlite3_user_data(pCtx);
  const char *zIn;
  assert( argc==1 || argc==2 );

  zIn = (const char*)sqlite3_value_text(argv[0]);
  if( zIn ){
    if( rbuIsVacuum(p) ){
      if( argc==1 || 0==sqlite3_value_int(argv[1]) ){
        sqlite3_result_text(pCtx, zIn, -1, SQLITE_STATIC);
      }
    }else{
      if( strlen(zIn)>4 && memcmp("data", zIn, 4)==0 ){
        int i;
        for(i=4; zIn[i]>='0' && zIn[i]<='9'; i++);
        if( zIn[i]=='_' && zIn[i+1] ){
          sqlite3_result_text(pCtx, &zIn[i+1], -1, SQLITE_STATIC);
        }
      }
    }
  }
}

/*
** Initialize the iterator structure passed as the second argument.
**
................................................................................
** error code is returned.
*/
static int rbuObjIterFirst(sqlite3rbu *p, RbuObjIter *pIter){
  int rc;
  memset(pIter, 0, sizeof(RbuObjIter));

  rc = prepareAndCollectError(p->dbRbu, &pIter->pTblIter, &p->zErrmsg, 
      "SELECT rbu_target_name(name, type='view') AS target, name "
      "FROM sqlite_master "
      "WHERE type IN ('table', 'view') AND target IS NOT NULL "
      "ORDER BY name"
  );

  if( rc==SQLITE_OK ){
    rc = prepareAndCollectError(p->dbMain, &pIter->pIdxIter, &p->zErrmsg,
        "SELECT name, rootpage, sql IS NULL OR substr(8, 6)=='UNIQUE' "
................................................................................
        bRbuRowid = 1;
      }
    }
    sqlite3_finalize(pStmt);
    pStmt = 0;

    if( p->rc==SQLITE_OK
     && rbuIsVacuum(p)==0
     && bRbuRowid!=(pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
    ){
      p->rc = SQLITE_ERROR;
      p->zErrmsg = sqlite3_mprintf(
          "table %q %s rbu_rowid column", pIter->zDataTbl,
          (bRbuRowid ? "may not have" : "requires")
      );
................................................................................
      /* An integer primary key. If the table has an explicit IPK, use
      ** its name. Otherwise, use "rbu_rowid".  */
      if( pIter->eType==RBU_PK_IPK ){
        int i;
        for(i=0; pIter->abTblPk[i]==0; i++);
        assert( i<pIter->nTblCol );
        zCol = pIter->azTblCol[i];
      }else if( rbuIsVacuum(p) ){
        zCol = "_rowid_";
      }else{
        zCol = "rbu_rowid";
      }
      zType = "INTEGER";
    }else{
      zCol = pIter->azTblCol[iCid];
      zType = pIter->azTblType[iCid];
................................................................................
        p->rc = prepareFreeAndCollectError(
            p->dbMain, &pIter->pInsert, &p->zErrmsg,
          sqlite3_mprintf("INSERT INTO \"rbu_imp_%w\" VALUES(%s)", zTbl, zBind)
        );
      }

      /* And to delete index entries */
      if( rbuIsVacuum(p)==0 && p->rc==SQLITE_OK ){
        p->rc = prepareFreeAndCollectError(
            p->dbMain, &pIter->pDelete, &p->zErrmsg,
          sqlite3_mprintf("DELETE FROM \"rbu_imp_%w\" WHERE %s", zTbl, zWhere)
        );
      }

      /* Create the SELECT statement to read keys in sorted order */
      if( p->rc==SQLITE_OK ){
        char *zSql;
        if( rbuIsVacuum(p) ){
          zSql = sqlite3_mprintf(
              "SELECT %s, 0 AS rbu_control FROM '%q' ORDER BY %s%s",
              zCollist, 
              pIter->zDataTbl,
              zCollist, zLimit
          );
        }else

        if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
          zSql = sqlite3_mprintf(
              "SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' ORDER BY %s%s",
              zCollist, p->zStateDb, pIter->zDataTbl,
              zCollist, zLimit
          );
        }else{
................................................................................
      }

      sqlite3_free(zImposterCols);
      sqlite3_free(zImposterPK);
      sqlite3_free(zWhere);
      sqlite3_free(zBind);
    }else{
      int bRbuRowid = (pIter->eType==RBU_PK_VTAB)
                    ||(pIter->eType==RBU_PK_NONE)
                    ||(pIter->eType==RBU_PK_EXTERNAL && rbuIsVacuum(p));
      const char *zTbl = pIter->zTbl;       /* Table this step applies to */
      const char *zWrite;                   /* Imposter table name */

      char *zBindings = rbuObjIterGetBindlist(p, pIter->nTblCol + bRbuRowid);
      char *zWhere = rbuObjIterGetWhere(p, pIter);
      char *zOldlist = rbuObjIterGetOldlist(p, pIter, "old");
      char *zNewlist = rbuObjIterGetOldlist(p, pIter, "new");
................................................................................
            sqlite3_mprintf(
              "INSERT INTO \"%s%w\"(%s%s) VALUES(%s)", 
              zWrite, zTbl, zCollist, (bRbuRowid ? ", _rowid_" : ""), zBindings
            )
        );
      }

      /* Create the DELETE statement to write to the target PK b-tree.
      ** Because it only performs INSERT operations, this is not required for
      ** an rbu vacuum handle.  */
      if( rbuIsVacuum(p)==0 && p->rc==SQLITE_OK ){
        p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pDelete, pz,
            sqlite3_mprintf(
              "DELETE FROM \"%s%w\" WHERE %s", zWrite, zTbl, zWhere
            )
        );
      }

      if( rbuIsVacuum(p)==0 && pIter->abIndexed ){
        const char *zRbuRowid = "";
        if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
          zRbuRowid = ", rbu_rowid";
        }

        /* Create the rbu_tmp_xxx table and the triggers to populate it. */
        rbuMPrintfExec(p, p->dbRbu,
................................................................................
        }

        rbuObjIterPrepareTmpInsert(p, pIter, zCollist, zRbuRowid);
      }

      /* Create the SELECT statement to read keys from data_xxx */
      if( p->rc==SQLITE_OK ){
        const char *zRbuRowid = "";
        if( bRbuRowid ){
          zRbuRowid = rbuIsVacuum(p) ? ",_rowid_ " : ",rbu_rowid";
        }
        p->rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pSelect, pz,
            sqlite3_mprintf(
              "SELECT %s,%s rbu_control%s FROM '%q'%s", 

              zCollist, 
              (rbuIsVacuum(p) ? "0 AS " : ""),
              zRbuRowid,
              pIter->zDataTbl, zLimit
            )
        );
      }

      sqlite3_free(zWhere);
      sqlite3_free(zOldlist);
................................................................................
    sqlite3_free(zWhere);
    sqlite3_free(zSet);
  }

  return p->rc;
}

static sqlite3 *rbuOpenDbhandle(
  sqlite3rbu *p, 
  const char *zName, 
  int bUseVfs
){
  sqlite3 *db = 0;
  if( p->rc==SQLITE_OK ){
    const int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_URI;
    p->rc = sqlite3_open_v2(zName, &db, flags, bUseVfs ? p->zVfsName : 0);
    if( p->rc ){
      p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
      sqlite3_close(db);
      db = 0;
    }
  }
  return db;
}

/*
** Free an RbuState object allocated by rbuLoadState().
*/
static void rbuFreeState(RbuState *p){
  if( p ){
    sqlite3_free(p->zTbl);
    sqlite3_free(p->zIdx);
    sqlite3_free(p);
  }
}

/*
** Allocate an RbuState object and load the contents of the rbu_state 
** table into it. Return a pointer to the new object. It is the 
** responsibility of the caller to eventually free the object using
** sqlite3_free().
**
** If an error occurs, leave an error code and message in the rbu handle
** and return NULL.
*/
static RbuState *rbuLoadState(sqlite3rbu *p){
  RbuState *pRet = 0;
  sqlite3_stmt *pStmt = 0;
  int rc;
  int rc2;

  pRet = (RbuState*)rbuMalloc(p, sizeof(RbuState));
  if( pRet==0 ) return 0;

  rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg, 
      sqlite3_mprintf("SELECT k, v FROM %s.rbu_state", p->zStateDb)
  );
  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
    switch( sqlite3_column_int(pStmt, 0) ){
      case RBU_STATE_STAGE:
        pRet->eStage = sqlite3_column_int(pStmt, 1);
        if( pRet->eStage!=RBU_STAGE_OAL
         && pRet->eStage!=RBU_STAGE_MOVE
         && pRet->eStage!=RBU_STAGE_CKPT
        ){
          p->rc = SQLITE_CORRUPT;
        }
        break;

      case RBU_STATE_TBL:
        pRet->zTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
        break;

      case RBU_STATE_IDX:
        pRet->zIdx = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
        break;

      case RBU_STATE_ROW:
        pRet->nRow = sqlite3_column_int(pStmt, 1);
        break;

      case RBU_STATE_PROGRESS:
        pRet->nProgress = sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_CKPT:
        pRet->iWalCksum = sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_COOKIE:
        pRet->iCookie = (u32)sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_OALSZ:
        pRet->iOalSz = (u32)sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_PHASEONESTEP:
        pRet->nPhaseOneStep = sqlite3_column_int64(pStmt, 1);
        break;

      default:
        rc = SQLITE_CORRUPT;
        break;
    }
  }
  rc2 = sqlite3_finalize(pStmt);
  if( rc==SQLITE_OK ) rc = rc2;

  p->rc = rc;
  return pRet;
}


/*
** Open the database handle and attach the RBU database as "rbu". If an
** error occurs, leave an error code and message in the RBU handle.
*/
static void rbuOpenDatabase(sqlite3rbu *p){
  assert( p->rc==SQLITE_OK );
  assert( p->dbMain==0 && p->dbRbu==0 );
  assert( rbuIsVacuum(p) || p->zTarget!=0 );



  /* Open the RBU database */
  p->dbRbu = rbuOpenDbhandle(p, p->zRbu, 1);

  if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
    sqlite3_file_control(p->dbRbu, "main", SQLITE_FCNTL_RBUCNT, (void*)p);
  }

  /* If using separate RBU and state databases, attach the state database to
  ** the RBU db handle now.  */
  if( p->zState ){
    rbuMPrintfExec(p, p->dbRbu, "ATTACH %Q AS stat", p->zState);
    memcpy(p->zStateDb, "stat", 4);
  }else{
    memcpy(p->zStateDb, "main", 4);
  }

#if 0
  if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
    p->rc = sqlite3_exec(p->dbRbu, "BEGIN", 0, 0, 0);
  }
#endif

  /* If it has not already been created, create the rbu_state table */
  rbuMPrintfExec(p, p->dbRbu, RBU_CREATE_STATE, p->zStateDb);

#if 0
  if( rbuIsVacuum(p) ){
    if( p->rc==SQLITE_OK ){
      int rc2;
      int bOk = 0;
      sqlite3_stmt *pCnt = 0;
      p->rc = prepareAndCollectError(p->dbRbu, &pCnt, &p->zErrmsg,
          "SELECT count(*) FROM stat.sqlite_master"
      );
      if( p->rc==SQLITE_OK 
       && sqlite3_step(pCnt)==SQLITE_ROW
       && 1==sqlite3_column_int(pCnt, 0)
      ){
        bOk = 1;
      }
      rc2 = sqlite3_finalize(pCnt);
      if( p->rc==SQLITE_OK ) p->rc = rc2;

      if( p->rc==SQLITE_OK && bOk==0 ){
        p->rc = SQLITE_ERROR;
        p->zErrmsg = sqlite3_mprintf("invalid state database");
      }
    
      if( p->rc==SQLITE_OK ){
        p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, 0);
      }
    }
  }
#endif

  if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
    int bOpen = 0;
    int rc;
    p->nRbu = 0;
    p->pRbuFd = 0;
    rc = sqlite3_file_control(p->dbRbu, "main", SQLITE_FCNTL_RBUCNT, (void*)p);
    if( rc!=SQLITE_NOTFOUND ) p->rc = rc;
    if( p->eStage>=RBU_STAGE_MOVE ){
      bOpen = 1;
    }else{
      RbuState *pState = rbuLoadState(p);
      if( pState ){
        bOpen = (pState->eStage>RBU_STAGE_MOVE);
        rbuFreeState(pState);
      }
    }
    if( bOpen ) p->dbMain = rbuOpenDbhandle(p, p->zRbu, p->nRbu<=1);
  }

  p->eStage = 0;
  if( p->rc==SQLITE_OK && p->dbMain==0 ){
    if( !rbuIsVacuum(p) ){
      p->dbMain = rbuOpenDbhandle(p, p->zTarget, 1);
    }else if( p->pRbuFd->pWalFd ){
      p->rc = SQLITE_ERROR;
      p->zErrmsg = sqlite3_mprintf("cannot vacuum wal mode database");
    }else{
      char *zTarget;
      char *zExtra = 0;
      if( strlen(p->zRbu)>=5 && 0==memcmp("file:", p->zRbu, 5) ){
        zExtra = &p->zRbu[5];
        while( *zExtra ){
          if( *zExtra++=='?' ) break;
        }
        if( *zExtra=='\0' ) zExtra = 0;
      }

      zTarget = sqlite3_mprintf("file:%s-vacuum?rbu_memory=1%s%s", 
          sqlite3_db_filename(p->dbRbu, "main"),
          (zExtra==0 ? "" : "&"), (zExtra==0 ? "" : zExtra)
      );

      if( zTarget==0 ){
        p->rc = SQLITE_NOMEM;
        return;
      }
      p->dbMain = rbuOpenDbhandle(p, zTarget, p->nRbu<=1);
      sqlite3_free(zTarget);
    }
  }

  if( p->rc==SQLITE_OK ){
    p->rc = sqlite3_create_function(p->dbMain, 
        "rbu_tmp_insert", -1, SQLITE_UTF8, (void*)p, rbuTmpInsertFunc, 0, 0
    );
  }

................................................................................
    p->rc = sqlite3_create_function(p->dbMain, 
        "rbu_fossil_delta", 2, SQLITE_UTF8, 0, rbuFossilDeltaFunc, 0, 0
    );
  }

  if( p->rc==SQLITE_OK ){
    p->rc = sqlite3_create_function(p->dbRbu, 
        "rbu_target_name", -1, SQLITE_UTF8, (void*)p, rbuTargetNameFunc, 0, 0
    );
  }

  if( p->rc==SQLITE_OK ){
    p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
  }
  rbuMPrintfExec(p, p->dbMain, "SELECT * FROM sqlite_master");
................................................................................
** on the database file. This proc moves the *-oal file to the *-wal path,
** then reopens the database file (this time in vanilla, non-oal, WAL mode).
** If an error occurs, leave an error code and error message in the rbu 
** handle.
*/
static void rbuMoveOalFile(sqlite3rbu *p){
  const char *zBase = sqlite3_db_filename(p->dbMain, "main");
  const char *zMove = zBase;
  char *zOal;
  char *zWal;

  if( rbuIsVacuum(p) ){
    zMove = sqlite3_db_filename(p->dbRbu, "main");
  }
  zOal = sqlite3_mprintf("%s-oal", zMove);
  zWal = sqlite3_mprintf("%s-wal", zMove);

  assert( p->eStage==RBU_STAGE_MOVE );
  assert( p->rc==SQLITE_OK && p->zErrmsg==0 );
  if( zWal==0 || zOal==0 ){
    p->rc = SQLITE_NOMEM;
  }else{
    /* Move the *-oal file to *-wal. At this point connection p->db is
................................................................................
    rbuLockDatabase(p);
    if( p->rc==SQLITE_OK ){
      rbuFileSuffix3(zBase, zWal);
      rbuFileSuffix3(zBase, zOal);

      /* Re-open the databases. */
      rbuObjIterFinalize(&p->objiter);
      sqlite3_close(p->dbRbu);
      sqlite3_close(p->dbMain);
      p->dbMain = 0;
      p->dbRbu = 0;

#if defined(_WIN32_WCE)
      {
        LPWSTR zWideOal;
        LPWSTR zWideWal;
................................................................................
      continue;
    }

    pVal = sqlite3_column_value(pIter->pSelect, i);
    p->rc = sqlite3_bind_value(pWriter, i+1, pVal);
    if( p->rc ) return;
  }
  if( pIter->zIdx==0 ){
    if( pIter->eType==RBU_PK_VTAB 
     || pIter->eType==RBU_PK_NONE 
     || (pIter->eType==RBU_PK_EXTERNAL && rbuIsVacuum(p)) 
    ){
      /* For a virtual table, or a table with no primary key, the 
      ** SELECT statement is:
      **
      **   SELECT <cols>, rbu_control, rbu_rowid FROM ....
      **
      ** Hence column_value(pIter->nCol+1).
      */
      assertColumnName(pIter->pSelect, pIter->nCol+1, 
          rbuIsVacuum(p) ? "rowid" : "rbu_rowid"
      );
      pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
      p->rc = sqlite3_bind_value(pWriter, pIter->nCol+1, pVal);
    }
  }
  if( p->rc==SQLITE_OK ){
    sqlite3_step(pWriter);
    p->rc = resetAndCollectError(pWriter, &p->zErrmsg);
  }
}

................................................................................
    }
  }
  return p->rc;
}

/*
** Increment the schema cookie of the main database opened by p->dbMain.
**
** Or, if this is an RBU vacuum, set the schema cookie of the main db
** opened by p->dbMain to one more than the schema cookie of the main
** db opened by p->dbRbu.
*/
static void rbuIncrSchemaCookie(sqlite3rbu *p){
  if( p->rc==SQLITE_OK ){
    sqlite3 *dbread = (rbuIsVacuum(p) ? p->dbRbu : p->dbMain);
    int iCookie = 1000000;
    sqlite3_stmt *pStmt;

    p->rc = prepareAndCollectError(dbread, &pStmt, &p->zErrmsg, 
        "PRAGMA schema_version"
    );
    if( p->rc==SQLITE_OK ){
      /* Coverage: it may be that this sqlite3_step() cannot fail. There
      ** is already a transaction open, so the prepared statement cannot
      ** throw an SQLITE_SCHEMA exception. The only database page the
      ** statement reads is page 1, which is guaranteed to be in the cache.
................................................................................
** Update the contents of the rbu_state table within the rbu database. The
** value stored in the RBU_STATE_STAGE column is eStage. All other values
** are determined by inspecting the rbu handle passed as the first argument.
*/
static void rbuSaveState(sqlite3rbu *p, int eStage){
  if( p->rc==SQLITE_OK || p->rc==SQLITE_DONE ){
    sqlite3_stmt *pInsert = 0;
    rbu_file *pFd = (rbuIsVacuum(p) ? p->pRbuFd : p->pTargetFd);
    int rc;

    assert( p->zErrmsg==0 );
    rc = prepareFreeAndCollectError(p->dbRbu, &pInsert, &p->zErrmsg, 
        sqlite3_mprintf(
          "INSERT OR REPLACE INTO %s.rbu_state(k, v) VALUES "
          "(%d, %d), "
................................................................................
          p->zStateDb,
          RBU_STATE_STAGE, eStage,
          RBU_STATE_TBL, p->objiter.zTbl, 
          RBU_STATE_IDX, p->objiter.zIdx, 
          RBU_STATE_ROW, p->nStep, 
          RBU_STATE_PROGRESS, p->nProgress,
          RBU_STATE_CKPT, p->iWalCksum,
          RBU_STATE_COOKIE, (i64)pFd->iCookie,
          RBU_STATE_OALSZ, p->iOalSz,
          RBU_STATE_PHASEONESTEP, p->nPhaseOneStep
      )
    );
    assert( pInsert==0 || rc==SQLITE_OK );

    if( rc==SQLITE_OK ){
................................................................................
      sqlite3_step(pInsert);
      rc = sqlite3_finalize(pInsert);
    }
    if( rc!=SQLITE_OK ) p->rc = rc;
  }
}


/*
** The second argument passed to this function is the name of a PRAGMA 
** setting - "page_size", "auto_vacuum", "user_version" or "application_id".
** This function executes the following on sqlite3rbu.dbRbu:
**
**   "PRAGMA main.$zPragma"
**
** where $zPragma is the string passed as the second argument, then
** on sqlite3rbu.dbMain:
**
**   "PRAGMA main.$zPragma = $val"
**
** where $val is the value returned by the first PRAGMA invocation.
**
** In short, it copies the value  of the specified PRAGMA setting from
** dbRbu to dbMain.
*/
static void rbuCopyPragma(sqlite3rbu *p, const char *zPragma){
  if( p->rc==SQLITE_OK ){
    sqlite3_stmt *pPragma = 0;
    p->rc = prepareFreeAndCollectError(p->dbRbu, &pPragma, &p->zErrmsg, 
        sqlite3_mprintf("PRAGMA main.%s", zPragma)
    );
    if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pPragma) ){
      p->rc = rbuMPrintfExec(p, p->dbMain, "PRAGMA main.%s = %d",
          zPragma, sqlite3_column_int(pPragma, 0)
      );
    }
    rbuFinalize(p, pPragma);
  }
}

/*
** The RBU handle passed as the only argument has just been opened and 
** the state database is empty. If this RBU handle was opened for an
** RBU vacuum operation, create the schema in the target db.
*/
static void rbuCreateTargetSchema(sqlite3rbu *p){
  sqlite3_stmt *pSql = 0;
  sqlite3_stmt *pInsert = 0;

  assert( rbuIsVacuum(p) );
  p->rc = sqlite3_exec(p->dbMain, "PRAGMA writable_schema=1", 0,0, &p->zErrmsg);
  if( p->rc==SQLITE_OK ){
    p->rc = prepareAndCollectError(p->dbRbu, &pSql, &p->zErrmsg, 
      "SELECT sql FROM sqlite_master WHERE sql!='' AND rootpage!=0"
      " AND name!='sqlite_sequence' "
      " ORDER BY type DESC"
    );
  }

  while( p->rc==SQLITE_OK && sqlite3_step(pSql)==SQLITE_ROW ){
    const char *zSql = (const char*)sqlite3_column_text(pSql, 0);
    p->rc = sqlite3_exec(p->dbMain, zSql, 0, 0, &p->zErrmsg);
  }
  rbuFinalize(p, pSql);
  if( p->rc!=SQLITE_OK ) return;

  if( p->rc==SQLITE_OK ){
    p->rc = prepareAndCollectError(p->dbRbu, &pSql, &p->zErrmsg, 
        "SELECT * FROM sqlite_master WHERE rootpage=0 OR rootpage IS NULL" 
    );
  }

  if( p->rc==SQLITE_OK ){
    p->rc = prepareAndCollectError(p->dbMain, &pInsert, &p->zErrmsg, 
        "INSERT INTO sqlite_master VALUES(?,?,?,?,?)"
    );
  }

  while( p->rc==SQLITE_OK && sqlite3_step(pSql)==SQLITE_ROW ){
    int i;
    for(i=0; i<5; i++){
      sqlite3_bind_value(pInsert, i+1, sqlite3_column_value(pSql, i));
    }
    sqlite3_step(pInsert);
    p->rc = sqlite3_reset(pInsert);
  }
  if( p->rc==SQLITE_OK ){
    p->rc = sqlite3_exec(p->dbMain, "PRAGMA writable_schema=0",0,0,&p->zErrmsg);
  }

  rbuFinalize(p, pSql);
  rbuFinalize(p, pInsert);
}

/*
** Step the RBU object.
*/
SQLITE_API int SQLITE_STDCALL sqlite3rbu_step(sqlite3rbu *p){
  if( p ){
    switch( p->eStage ){
      case RBU_STAGE_OAL: {
        RbuObjIter *pIter = &p->objiter;

        /* If this is an RBU vacuum operation and the state table was empty
        ** when this handle was opened, create the target database schema. */
        if( rbuIsVacuum(p) && p->nProgress==0 && p->rc==SQLITE_OK ){
          rbuCreateTargetSchema(p);
          rbuCopyPragma(p, "user_version");
          rbuCopyPragma(p, "application_id");
        }

        while( p->rc==SQLITE_OK && pIter->zTbl ){

          if( pIter->bCleanup ){
            /* Clean up the rbu_tmp_xxx table for the previous table. It 
            ** cannot be dropped as there are currently active SQL statements.
            ** But the contents can be deleted.  */
            if( rbuIsVacuum(p)==0 && pIter->abIndexed ){
              rbuMPrintfExec(p, p->dbRbu, 
                  "DELETE FROM %s.'rbu_tmp_%q'", p->zStateDb, pIter->zDataTbl
              );
            }
          }else{
            rbuObjIterPrepareAll(p, pIter, 0);

................................................................................
    }
    return p->rc;
  }else{
    return SQLITE_NOMEM;
  }
}

























































































/*
** Compare strings z1 and z2, returning 0 if they are identical, or non-zero
** otherwise. Either or both argument may be NULL. Two NULL values are
** considered equal, and NULL is considered distinct from all other values.
*/
static int rbuStrCompare(const char *z1, const char *z2){
  if( z1==0 && z2==0 ) return 0;
................................................................................
        }
        p->rc = sqlite3_finalize(pStmt);
      }
    }
  }
}



static sqlite3rbu *openRbuHandle(


  const char *zTarget, 
  const char *zRbu,
  const char *zState
){
  sqlite3rbu *p;
  size_t nTarget = zTarget ? strlen(zTarget) : 0;
  size_t nRbu = strlen(zRbu);
  size_t nState = zState ? strlen(zState) : 0;
  size_t nByte = sizeof(sqlite3rbu) + nTarget+1 + nRbu+1+ nState+1;

  p = (sqlite3rbu*)sqlite3_malloc64(nByte);
  if( p ){
    RbuState *pState = 0;

    /* Create the custom VFS. */
    memset(p, 0, sizeof(sqlite3rbu));
    rbuCreateVfs(p);

    /* Open the target, RBU and state databases */
    if( p->rc==SQLITE_OK ){
      char *pCsr = (char*)&p[1];
      if( zTarget ){
        p->zTarget = pCsr;
        memcpy(p->zTarget, zTarget, nTarget+1);
        pCsr += nTarget+1;
      }
      p->zRbu = pCsr;
      memcpy(p->zRbu, zRbu, nRbu+1);
      pCsr += nRbu+1;
      if( zState ){
        p->zState = pCsr;
        memcpy(p->zState, zState, nState+1);
      }
      rbuOpenDatabase(p);
    }




    if( p->rc==SQLITE_OK ){
      pState = rbuLoadState(p);
      assert( pState || p->rc!=SQLITE_OK );
      if( p->rc==SQLITE_OK ){

        if( pState->eStage==0 ){ 
          rbuDeleteOalFile(p);
................................................................................
        p->zErrmsg = sqlite3_mprintf("cannot update wal mode database");
      }else if( p->eStage==RBU_STAGE_MOVE ){
        p->eStage = RBU_STAGE_CKPT;
        p->nStep = 0;
      }
    }

    if( p->rc==SQLITE_OK 
     && (p->eStage==RBU_STAGE_OAL || p->eStage==RBU_STAGE_MOVE)
     && pState->eStage!=0
    ){
      rbu_file *pFd = (rbuIsVacuum(p) ? p->pRbuFd : p->pTargetFd);
      if( pFd->iCookie!=pState->iCookie ){   
        /* At this point (pTargetFd->iCookie) contains the value of the
        ** change-counter cookie (the thing that gets incremented when a 
        ** transaction is committed in rollback mode) currently stored on 
        ** page 1 of the database file. */
        p->rc = SQLITE_BUSY;
        p->zErrmsg = sqlite3_mprintf("database modified during rbu %s",
            (rbuIsVacuum(p) ? "vacuum" : "update")
        );
      }
    }

    if( p->rc==SQLITE_OK ){
      if( p->eStage==RBU_STAGE_OAL ){
        sqlite3 *db = p->dbMain;

        if( pState->eStage==0 && rbuIsVacuum(p) ){
          rbuCopyPragma(p, "page_size");
          rbuCopyPragma(p, "auto_vacuum");
        }

        /* Open transactions both databases. The *-oal file is opened or
        ** created at this point. */
        if( p->rc==SQLITE_OK ){
          p->rc = sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, &p->zErrmsg);
        }
        if( p->rc==SQLITE_OK ){
          p->rc = sqlite3_exec(p->dbRbu, "BEGIN", 0, 0, &p->zErrmsg);
        }

        /* Check if the main database is a zipvfs db. If it is, set the upper
        ** level pager to use "journal_mode=off". This prevents it from 
        ** generating a large journal using a temp file.  */
        if( p->rc==SQLITE_OK ){
          int frc = sqlite3_file_control(db, "main", SQLITE_FCNTL_ZIPVFS, 0);
................................................................................

    rbuFreeState(pState);
  }

  return p;
}

/*
** Open and return a new RBU handle. 
*/
SQLITE_API sqlite3rbu *SQLITE_STDCALL sqlite3rbu_open(
  const char *zTarget, 
  const char *zRbu,
  const char *zState
){
  /* TODO: Check that zTarget and zRbu are non-NULL */
  return openRbuHandle(zTarget, zRbu, zState);
}

/*
** Open a handle to begin or resume an RBU VACUUM operation.
*/
SQLITE_API sqlite3rbu *SQLITE_STDCALL sqlite3rbu_vacuum(
  const char *zTarget, 
  const char *zState
){
  /* TODO: Check that both arguments are non-NULL */
  return openRbuHandle(0, zTarget, zState);
}

/*
** Return the database handle used by pRbu.
*/
SQLITE_API sqlite3 *SQLITE_STDCALL sqlite3rbu_db(sqlite3rbu *pRbu, int bRbu){
  sqlite3 *db = 0;
  if( pRbu ){
................................................................................
/*
** If the error code currently stored in the RBU handle is SQLITE_CONSTRAINT,
** then edit any error message string so as to remove all occurrences of
** the pattern "rbu_imp_[0-9]*".
*/
static void rbuEditErrmsg(sqlite3rbu *p){
  if( p->rc==SQLITE_CONSTRAINT && p->zErrmsg ){
    unsigned int i;
    size_t nErrmsg = strlen(p->zErrmsg);
    for(i=0; i<(nErrmsg-8); i++){
      if( memcmp(&p->zErrmsg[i], "rbu_imp_", 8)==0 ){
        int nDel = 8;
        while( p->zErrmsg[i+nDel]>='0' && p->zErrmsg[i+nDel]<='9' ) nDel++;
        memmove(&p->zErrmsg[i], &p->zErrmsg[i+nDel], nErrmsg + 1 - i - nDel);
        nErrmsg -= nDel;
................................................................................

    if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
      p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
    }

    /* Close any open statement handles. */
    rbuObjIterFinalize(&p->objiter);

    /* If this is an RBU vacuum handle and the vacuum has either finished
    ** successfully or encountered an error, delete the contents of the 
    ** state table. This causes the next call to sqlite3rbu_vacuum() 
    ** specifying the current target and state databases to start a new
    ** vacuum from scratch.  */
    if( rbuIsVacuum(p) && p->rc!=SQLITE_OK && p->dbRbu ){
      int rc2 = sqlite3_exec(p->dbRbu, "DELETE FROM stat.rbu_state", 0, 0, 0);
      if( p->rc==SQLITE_DONE && rc2!=SQLITE_OK ) p->rc = rc2;
    }

    /* Close the open database handle and VFS object. */
    sqlite3_close(p->dbRbu);
    sqlite3_close(p->dbMain);
    rbuDeleteVfs(p);
    sqlite3_free(p->aBuf);
    sqlite3_free(p->aFrame);

    rbuEditErrmsg(p);
    rc = p->rc;
    *pzErrmsg = p->zErrmsg;
................................................................................
*/
static u32 rbuGetU32(u8 *aBuf){
  return ((u32)aBuf[0] << 24)
       + ((u32)aBuf[1] << 16)
       + ((u32)aBuf[2] <<  8)
       + ((u32)aBuf[3]);
}

/*
** Write an unsigned 32-bit value in big-endian format to the supplied
** buffer.
*/
static void rbuPutU32(u8 *aBuf, u32 iVal){
  aBuf[0] = (iVal >> 24) & 0xFF;
  aBuf[1] = (iVal >> 16) & 0xFF;
  aBuf[2] = (iVal >>  8) & 0xFF;
  aBuf[3] = (iVal >>  0) & 0xFF;
}

static void rbuPutU16(u8 *aBuf, u16 iVal){
  aBuf[0] = (iVal >>  8) & 0xFF;
  aBuf[1] = (iVal >>  0) & 0xFF;
}

/*
** Read data from an rbuVfs-file.
*/
static int rbuVfsRead(
  sqlite3_file *pFile, 
  void *zBuf, 
................................................................................
     && (p->openFlags & SQLITE_OPEN_WAL) 
     && iOfst>=pRbu->iOalSz 
    ){
      rc = SQLITE_OK;
      memset(zBuf, 0, iAmt);
    }else{
      rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
#if 1
      /* If this is being called to read the first page of the target 
      ** database as part of an rbu vacuum operation, synthesize the 
      ** contents of the first page if it does not yet exist. Otherwise,
      ** SQLite will not check for a *-wal file.  */
      if( pRbu && rbuIsVacuum(pRbu) 
          && rc==SQLITE_IOERR_SHORT_READ && iOfst==0
          && (p->openFlags & SQLITE_OPEN_MAIN_DB)
          && pRbu->rc==SQLITE_OK
      ){
        sqlite3_file *pFd = (sqlite3_file*)pRbu->pRbuFd;
        rc = pFd->pMethods->xRead(pFd, zBuf, iAmt, iOfst);
        if( rc==SQLITE_OK ){
          u8 *aBuf = (u8*)zBuf;
          u32 iRoot = rbuGetU32(&aBuf[52]) ? 1 : 0;
          rbuPutU32(&aBuf[52], iRoot);      /* largest root page number */
          rbuPutU32(&aBuf[36], 0);          /* number of free pages */
          rbuPutU32(&aBuf[32], 0);          /* first page on free list trunk */
          rbuPutU32(&aBuf[28], 1);          /* size of db file in pages */
          rbuPutU32(&aBuf[24], pRbu->pRbuFd->iCookie+1);  /* Change counter */

          if( iAmt>100 ){
            memset(&aBuf[100], 0, iAmt-100);
            rbuPutU16(&aBuf[105], iAmt & 0xFFFF);
            aBuf[100] = 0x0D;
          }
        }
      }
#endif
    }
    if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
      /* These look like magic numbers. But they are stable, as they are part
       ** of the definition of the SQLite file format, which may not change. */
      u8 *pBuf = (u8*)zBuf;
      p->iCookie = rbuGetU32(&pBuf[24]);
      p->iWriteVer = pBuf[19];
................................................................................
}

/*
** Return the current file-size of an rbuVfs-file.
*/
static int rbuVfsFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
  rbu_file *p = (rbu_file *)pFile;
  int rc;
  rc = p->pReal->pMethods->xFileSize(p->pReal, pSize);

  /* If this is an RBU vacuum operation and this is the target database,
  ** pretend that it has at least one page. Otherwise, SQLite will not
  ** check for the existance of a *-wal file. rbuVfsRead() contains 
  ** similar logic.  */
  if( rc==SQLITE_OK && *pSize==0 
   && p->pRbu && rbuIsVacuum(p->pRbu) 
   && (p->openFlags & SQLITE_OPEN_MAIN_DB)
  ){
    *pSize = 1024;
  }
  return rc;
}

/*
** Lock an rbuVfs-file.
*/
static int rbuVfsLock(sqlite3_file *pFile, int eLock){
  rbu_file *p = (rbu_file*)pFile;
  sqlite3rbu *pRbu = p->pRbu;
  int rc = SQLITE_OK;

  assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
  if( eLock==SQLITE_LOCK_EXCLUSIVE 
   && (p->bNolock || (pRbu && pRbu->eStage!=RBU_STAGE_DONE))
  ){
    /* Do not allow EXCLUSIVE locks. Preventing SQLite from taking this 
    ** prevents it from checkpointing the database from sqlite3_close(). */
    rc = SQLITE_BUSY;
  }else{
    rc = p->pReal->pMethods->xLock(p->pReal, eLock);
  }

................................................................................
        pRbu->pTargetFd = p;
        p->pRbu = pRbu;
        if( p->pWalFd ) p->pWalFd->pRbu = pRbu;
        rc = SQLITE_OK;
      }
    }
    return rc;
  }
  else if( op==SQLITE_FCNTL_RBUCNT ){
    sqlite3rbu *pRbu = (sqlite3rbu*)pArg;
    pRbu->nRbu++;
    pRbu->pRbuFd = p;
    p->bNolock = 1;
  }

  rc = xControl(p->pReal, op, pArg);
  if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
    rbu_vfs *pRbuVfs = p->pRbuVfs;
    char *zIn = *(char**)pArg;
    char *zOut = sqlite3_mprintf("rbu(%s)/%z", pRbuVfs->base.zName, zIn);
................................................................................
static rbu_file *rbuFindMaindb(rbu_vfs *pRbuVfs, const char *zWal){
  rbu_file *pDb;
  sqlite3_mutex_enter(pRbuVfs->mutex);
  for(pDb=pRbuVfs->pMain; pDb && pDb->zWal!=zWal; pDb=pDb->pMainNext){}
  sqlite3_mutex_leave(pRbuVfs->mutex);
  return pDb;
}

/* 
** A main database named zName has just been opened. The following 
** function returns a pointer to a buffer owned by SQLite that contains
** the name of the *-wal file this db connection will use. SQLite
** happens to pass a pointer to this buffer when using xAccess()
** or xOpen() to operate on the *-wal file.  
*/
static const char *rbuMainToWal(const char *zName, int flags){
  int n = (int)strlen(zName);
  const char *z = &zName[n];
  if( flags & SQLITE_OPEN_URI ){
    int odd = 0;
    while( 1 ){
      if( z[0]==0 ){
        odd = 1 - odd;
        if( odd && z[1]==0 ) break;
      }
      z++;
    }
    z += 2;
  }else{
    while( *z==0 ) z++;
  }
  z += (n + 8 + 1);
  return z;
}

/*
** Open an rbu file handle.
*/
static int rbuVfsOpen(
  sqlite3_vfs *pVfs,
  const char *zName,
................................................................................
    0, 0                          /* xFetch, xUnfetch */
  };
  rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
  sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
  rbu_file *pFd = (rbu_file *)pFile;
  int rc = SQLITE_OK;
  const char *zOpen = zName;
  int oflags = flags;

  memset(pFd, 0, sizeof(rbu_file));
  pFd->pReal = (sqlite3_file*)&pFd[1];
  pFd->pRbuVfs = pRbuVfs;
  pFd->openFlags = flags;
  if( zName ){
    if( flags & SQLITE_OPEN_MAIN_DB ){
      /* A main database has just been opened. The following block sets
      ** (pFd->zWal) to point to a buffer owned by SQLite that contains
      ** the name of the *-wal file this db connection will use. SQLite
      ** happens to pass a pointer to this buffer when using xAccess()
      ** or xOpen() to operate on the *-wal file.  */
















      pFd->zWal = rbuMainToWal(zName, flags);
    }
    else if( flags & SQLITE_OPEN_WAL ){
      rbu_file *pDb = rbuFindMaindb(pRbuVfs, zName);
      if( pDb ){
        if( pDb->pRbu && pDb->pRbu->eStage==RBU_STAGE_OAL ){
          /* This call is to open a *-wal file. Intead, open the *-oal. This
          ** code ensures that the string passed to xOpen() is terminated by a
          ** pair of '\0' bytes in case the VFS attempts to extract a URI 
          ** parameter from it.  */
          const char *zBase = zName;
          size_t nCopy;
          char *zCopy;
          if( rbuIsVacuum(pDb->pRbu) ){
            zBase = sqlite3_db_filename(pDb->pRbu->dbRbu, "main");
            zBase = rbuMainToWal(zBase, SQLITE_OPEN_URI);
          }
          nCopy = strlen(zBase);
          zCopy = sqlite3_malloc64(nCopy+2);
          if( zCopy ){
            memcpy(zCopy, zBase, nCopy);
            zCopy[nCopy-3] = 'o';
            zCopy[nCopy] = '\0';
            zCopy[nCopy+1] = '\0';
            zOpen = (const char*)(pFd->zDel = zCopy);
          }else{
            rc = SQLITE_NOMEM;
          }
          pFd->pRbu = pDb->pRbu;
        }
        pDb->pWalFd = pFd;
      }
    }
  }

  if( oflags & SQLITE_OPEN_MAIN_DB 
   && sqlite3_uri_boolean(zName, "rbu_memory", 0) 
  ){
    assert( oflags & SQLITE_OPEN_MAIN_DB );
    oflags =  SQLITE_OPEN_TEMP_DB | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE |
              SQLITE_OPEN_EXCLUSIVE | SQLITE_OPEN_DELETEONCLOSE;
    zOpen = 0;
  }

  if( rc==SQLITE_OK ){
    rc = pRealVfs->xOpen(pRealVfs, zOpen, pFd->pReal, oflags, pOutFlags);
  }
  if( pFd->pReal->pMethods ){
    /* The xOpen() operation has succeeded. Set the sqlite3_file.pMethods
    ** pointer and, if the file is a main database file, link it into the
    ** mutex protected linked list of all such files.  */
    pFile->pMethods = &rbuvfs_io_methods;
    if( flags & SQLITE_OPEN_MAIN_DB ){
................................................................................
  u8 *aRight                      /* Change record */
){
  u8 *a1 = aLeft;                 /* Cursor to iterate through aLeft */
  u8 *a2 = aRight;                /* Cursor to iterate through aRight */
  int iCol;                       /* Used to iterate through table columns */

  for(iCol=0; iCol<pTab->nCol; iCol++){
    if( pTab->abPK[iCol] ){
      int n1 = sessionSerialLen(a1);
      int n2 = sessionSerialLen(a2);

      if( pTab->abPK[iCol] && (n1!=n2 || memcmp(a1, a2, n1)) ){
        return 0;
      }
      a1 += n1;
      a2 += n2;
    }else{
      if( bLeftPkOnly==0 ) a1 += sessionSerialLen(a1);
      if( bRightPkOnly==0 ) a2 += sessionSerialLen(a2);
    }
  }

  return 1;
}

/*
** Arguments aLeft and aRight both point to buffers containing change
................................................................................
  char *zPragma;
  sqlite3_stmt *pStmt;
  int rc;
  int nByte;
  int nDbCol = 0;
  int nThis;
  int i;
  u8 *pAlloc = 0;
  char **azCol = 0;
  u8 *abPK = 0;

  assert( pazCol && pabPK );

  nThis = sqlite3Strlen30(zThis);
  zPragma = sqlite3_mprintf("PRAGMA '%q'.table_info('%q')", zDb, zThis);
  if( !zPragma ) return SQLITE_NOMEM;

................................................................................
  SessionTable *pTab;

  for(pTab=pList; pTab; pTab=pNext){
    int i;
    pNext = pTab->pNext;
    for(i=0; i<pTab->nChange; i++){
      SessionChange *p;
      SessionChange *pNextChange;
      for(p=pTab->apChange[i]; p; p=pNextChange){
        pNextChange = p->pNext;
        sqlite3_free(p);
      }
    }
    sqlite3_free((char*)pTab->azCol);  /* cast works around VC++ bug */
    sqlite3_free(pTab->apChange);
    sqlite3_free(pTab);
  }
................................................................................
    }

    if( p->bPatchset && p->op==SQLITE_UPDATE ){
      /* If this is an UPDATE that is part of a patchset, then all PK and
      ** modified fields are present in the new.* record. The old.* record
      ** is currently completely empty. This block shifts the PK fields from
      ** new.* to old.*, to accommodate the code that reads these arrays.  */

      for(i=0; i<p->nCol; i++){
        assert( p->apValue[i]==0 );
        assert( p->abPK[i]==0 || p->apValue[i+p->nCol] );
        if( p->abPK[i] ){
          p->apValue[i] = p->apValue[i+p->nCol];
          p->apValue[i+p->nCol] = 0;
        }
................................................................................
  int eType,                      /* Either CHANGESET_DATA or CONFLICT */
  SessionApplyCtx *p,             /* changeset_apply() context */
  sqlite3_changeset_iter *pIter,  /* Changeset iterator */
  int(*xConflict)(void *, int, sqlite3_changeset_iter*),
  void *pCtx,                     /* First argument for conflict handler */
  int *pbReplace                  /* OUT: Set to true if PK row is found */
){
  int res = 0;                    /* Value returned by conflict handler */
  int rc;
  int nCol;
  int op;
  const char *zDummy;

  sqlite3changeset_op(pIter, &zDummy, &nCol, &op, 0);

................................................................................
    }else{
      /* Append a new column value, if necessary */
      assert( iCol>=p->iCol );
      if( iCol!=p->iCol ){
        if( pHash->eDetail==FTS5_DETAIL_FULL ){
          pPtr[p->nData++] = 0x01;
          p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iCol);
          p->iCol = (i16)iCol;
          p->iPos = 0;
        }else{
          bNew = 1;
          p->iCol = (i16)(iPos = iCol);
        }
      }

      /* Append the new position offset, if necessary */
      if( bNew ){
        p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iPos - p->iPos + 2);
        p->iPos = iPos;
................................................................................
    while( a<pEnd ){
      iPrev += (int)a++[0] - 2;
      while( *aiCol<iPrev ){
        aiCol++;
        if( aiCol==aiColEnd ) goto setoutputs_col_out;
      }
      if( *aiCol==iPrev ){
        *aOut++ = (u8)((iPrev - iPrevOut) + 2);
        iPrevOut = iPrev;
      }
    }

setoutputs_col_out:
    pIter->base.pData = pIter->poslist.p;
    pIter->base.nData = aOut - pIter->poslist.p;
................................................................................
static void fts5SourceIdFunc(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args */
  sqlite3_value **apUnused        /* Function arguments */
){
  assert( nArg==0 );
  UNUSED_PARAM2(nArg, apUnused);
  sqlite3_result_text(pCtx, "fts5: 2016-05-02 13:57:19 e4af967533f290862dfba1d9ef44d4c9ddd8a01b", -1, SQLITE_TRANSIENT);
}

static int fts5Init(sqlite3 *db){
  static const sqlite3_module fts5Mod = {
    /* iVersion      */ 2,
    /* xCreate       */ fts5CreateMethod,
    /* xConnect      */ fts5ConnectMethod,

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.13.0"
#define SQLITE_VERSION_NUMBER 3013000
#define SQLITE_SOURCE_ID      "2016-04-07 21:14:35 87aa9357fbe6749bae60e30af54ca16e48678802"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** positive to enable fts3_tokenizer() or negative to leave the setting
** unchanged.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether fts3_tokenizer is disabled or enabled
** following this call.  The second parameter may be a NULL pointer, in
** which case the new setting is not reported back. </dd>
**

















** </dl>
*/
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */



/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
................................................................................
** ^If an error occurs and pzErrMsg is not 0, then the
** [sqlite3_load_extension()] interface shall attempt to
** fill *pzErrMsg with error message text stored in memory
** obtained from [sqlite3_malloc()]. The calling function
** should free this memory by calling [sqlite3_free()].
**
** ^Extension loading must be enabled using
** [sqlite3_enable_load_extension()] prior to calling this API,


** otherwise an error will be returned.







**
** See also the [load_extension() SQL function].
*/
SQLITE_API int SQLITE_STDCALL sqlite3_load_extension(
  sqlite3 *db,          /* Load the extension into this database connection */
  const char *zFile,    /* Name of the shared library containing extension */
  const char *zProc,    /* Entry point.  Derived from zFile if 0 */
................................................................................
** [extension loading] while evaluating user-entered SQL, the following API
** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
**
** ^Extension loading is off by default.
** ^Call the sqlite3_enable_load_extension() routine with onoff==1
** to turn extension loading on and call it with onoff==0 to turn
** it back off again.











*/
SQLITE_API int SQLITE_STDCALL sqlite3_enable_load_extension(sqlite3 *db, int onoff);

/*
** CAPI3REF: Automatically Load Statically Linked Extensions
**
** ^This interface causes the xEntryPoint() function to be invoked for
................................................................................
  sqlite3_snapshot **ppSnapshot
);

/*
** CAPI3REF: Start a read transaction on an historical snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_open(D,S,P)] interface attempts to move the
** read transaction that is currently open on schema S of

** [database connection] D so that it refers to historical [snapshot] P.

** ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK on success
** or an appropriate [error code] if it fails.
**
** ^In order to succeed, a call to [sqlite3_snapshot_open(D,S,P)] must be
** the first operation, apart from other sqlite3_snapshot_open() calls,
** following the [BEGIN] that starts a new read transaction.




** ^A [snapshot] will fail to open if it has been overwritten by a 
** [checkpoint].
** ^A [snapshot] will fail to open if the database connection D has not
** previously completed at least one read operation against the database 






** file.  (Hint: Run "[PRAGMA application_id]" against a newly opened
** database connection in order to make it ready to use snapshots.)
**
** The [sqlite3_snapshot_open()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL int SQLITE_STDCALL sqlite3_snapshot_open(
  sqlite3 *db,
................................................................................
** The application must eventually free every [sqlite3_snapshot] object
** using this routine to avoid a memory leak.
**
** The [sqlite3_snapshot_free()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL void SQLITE_STDCALL sqlite3_snapshot_free(sqlite3_snapshot*);




























/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.13.0"
#define SQLITE_VERSION_NUMBER 3013000
#define SQLITE_SOURCE_ID      "2016-05-02 13:57:19 e4af967533f290862dfba1d9ef44d4c9ddd8a01b"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** positive to enable fts3_tokenizer() or negative to leave the setting
** unchanged.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether fts3_tokenizer is disabled or enabled
** following this call.  The second parameter may be a NULL pointer, in
** which case the new setting is not reported back. </dd>
**
** <dt>SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION</dt>
** <dd> ^This option is used to enable or disable the [sqlite3_load_extension()]
** interface independently of the [load_extension()] SQL function.
** The [sqlite3_enable_load_extension()] API enables or disables both the
** C-API [sqlite3_load_extension()] and the SQL function [load_extension()].
** There should be two additional arguments.
** When the first argument to this interface is 1, then only the C-API is
** enabled and the SQL function remains disabled.  If the first argment to
** this interface is 0, then both the C-API and the SQL function are disabled.
** If the first argument is -1, then no changes are made to state of either the
** C-API or the SQL function.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether [sqlite3_load_extension()] interface
** is disabled or enabled following this call.  The second parameter may
** be a NULL pointer, in which case the new setting is not reported back.
** </dd>
**
** </dl>
*/
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */


/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
................................................................................
** ^If an error occurs and pzErrMsg is not 0, then the
** [sqlite3_load_extension()] interface shall attempt to
** fill *pzErrMsg with error message text stored in memory
** obtained from [sqlite3_malloc()]. The calling function
** should free this memory by calling [sqlite3_free()].
**
** ^Extension loading must be enabled using
** [sqlite3_enable_load_extension()] or
** [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],1,NULL)
** prior to calling this API,
** otherwise an error will be returned.
**
** <b>Security warning:</b> It is recommended that the 
** [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method be used to enable only this
** interface.  The use of the [sqlite3_enable_load_extension()] interface
** should be avoided.  This will keep the SQL function [load_extension()]
** disabled and prevent SQL injections from giving attackers
** access to extension loading capabilities.
**
** See also the [load_extension() SQL function].
*/
SQLITE_API int SQLITE_STDCALL sqlite3_load_extension(
  sqlite3 *db,          /* Load the extension into this database connection */
  const char *zFile,    /* Name of the shared library containing extension */
  const char *zProc,    /* Entry point.  Derived from zFile if 0 */
................................................................................
** [extension loading] while evaluating user-entered SQL, the following API
** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
**
** ^Extension loading is off by default.
** ^Call the sqlite3_enable_load_extension() routine with onoff==1
** to turn extension loading on and call it with onoff==0 to turn
** it back off again.
**
** ^This interface enables or disables both the C-API
** [sqlite3_load_extension()] and the SQL function [load_extension()].
** Use [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],..)
** to enable or disable only the C-API.
**
** <b>Security warning:</b> It is recommended that extension loading
** be disabled using the [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method
** rather than this interface, so the [load_extension()] SQL function
** remains disabled. This will prevent SQL injections from giving attackers
** access to extension loading capabilities.
*/
SQLITE_API int SQLITE_STDCALL sqlite3_enable_load_extension(sqlite3 *db, int onoff);

/*
** CAPI3REF: Automatically Load Statically Linked Extensions
**
** ^This interface causes the xEntryPoint() function to be invoked for
................................................................................
  sqlite3_snapshot **ppSnapshot
);

/*
** CAPI3REF: Start a read transaction on an historical snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_open(D,S,P)] interface starts a
** read transaction for schema S of
** [database connection] D such that the read transaction
** refers to historical [snapshot] P, rather than the most
** recent change to the database.
** ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK on success
** or an appropriate [error code] if it fails.
**
** ^In order to succeed, a call to [sqlite3_snapshot_open(D,S,P)] must be

** the first operation following the [BEGIN] that takes the schema S
** out of [autocommit mode].
** ^In other words, schema S must not currently be in
** a transaction for [sqlite3_snapshot_open(D,S,P)] to work, but the
** database connection D must be out of [autocommit mode].
** ^A [snapshot] will fail to open if it has been overwritten by a
** [checkpoint].


** ^(A call to [sqlite3_snapshot_open(D,S,P)] will fail if the
** database connection D does not know that the database file for
** schema S is in [WAL mode].  A database connection might not know
** that the database file is in [WAL mode] if there has been no prior
** I/O on that database connection, or if the database entered [WAL mode] 
** after the most recent I/O on the database connection.)^
** (Hint: Run "[PRAGMA application_id]" against a newly opened
** database connection in order to make it ready to use snapshots.)
**
** The [sqlite3_snapshot_open()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL int SQLITE_STDCALL sqlite3_snapshot_open(
  sqlite3 *db,
................................................................................
** The application must eventually free every [sqlite3_snapshot] object
** using this routine to avoid a memory leak.
**
** The [sqlite3_snapshot_free()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_API SQLITE_EXPERIMENTAL void SQLITE_STDCALL sqlite3_snapshot_free(sqlite3_snapshot*);

/*
** CAPI3REF: Compare the ages of two snapshot handles.
** EXPERIMENTAL
**
** The sqlite3_snapshot_cmp(P1, P2) interface is used to compare the ages
** of two valid snapshot handles. 
**
** If the two snapshot handles are not associated with the same database 
** file, the result of the comparison is undefined. 
**
** Additionally, the result of the comparison is only valid if both of the
** snapshot handles were obtained by calling sqlite3_snapshot_get() since the
** last time the wal file was deleted. The wal file is deleted when the
** database is changed back to rollback mode or when the number of database
** clients drops to zero. If either snapshot handle was obtained before the 
** wal file was last deleted, the value returned by this function 
** is undefined.
**
** Otherwise, this API returns a negative value if P1 refers to an older
** snapshot than P2, zero if the two handles refer to the same database
** snapshot, and a positive value if P1 is a newer snapshot than P2.
*/
SQLITE_API SQLITE_EXPERIMENTAL int SQLITE_STDCALL sqlite3_snapshot_cmp(
  sqlite3_snapshot *p1,
  sqlite3_snapshot *p2
);

/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double