SQLite

clean:	
	rm -f *.lo *.la *.o sqlite3$(TEXE) libsqlite3.la
	rm -f sqlite3.h opcodes.*
	rm -rf .libs .deps
	rm -f lemon$(BEXE) lempar.c parse.* sqlite*.tar.gz
	rm -f mkkeywordhash$(BEXE) keywordhash.h
	rm -f *.da *.bb *.bbg gmon.out

	rm -rf tsrc .target_source
	rm -f tclsqlite3$(TEXE)
	rm -f testfixture$(TEXE) test.db
	rm -f LogEst$(TEXE) fts3view$(TEXE) rollback-test$(TEXE) showdb$(TEXE)
	rm -f showjournal$(TEXE) showstat4$(TEXE) showwal$(TEXE) speedtest1$(TEXE)
	rm -f wordcount$(TEXE) changeset$(TEXE)
	rm -f sqlite3.dll sqlite3.lib sqlite3.exp sqlite3.def

fts3_write.lo:	$(TOP)\ext\fts3\fts3_write.c $(HDR) $(EXTHDR)
	$(LTCOMPILE) $(CORE_COMPILE_OPTS) $(NO_WARN) -DSQLITE_CORE -c $(TOP)\ext\fts3\fts3_write.c

rtree.lo:	$(TOP)\ext\rtree\rtree.c $(HDR) $(EXTHDR)
	$(LTCOMPILE) $(CORE_COMPILE_OPTS) $(NO_WARN) -DSQLITE_CORE -c $(TOP)\ext\rtree\rtree.c

sqlite3session.lo:	$(TOP)\ext\session\sqlite3session.c $(HDR) $(EXTHDR)
	$(LTCOMPILE) $(CORE_COMPILE_OPTS) $(NO_WARN) -DSQLITE_CORE -c $(TOP)\ext\session\sqlite3session.c

# FTS5 things
#
FTS5_SRC = \
   $(TOP)\ext\fts5\fts5.h \
   $(TOP)\ext\fts5\fts5Int.h \

	del /Q sqlite3.c sqlite3.h 2>NUL
	del /Q opcodes.c opcodes.h 2>NUL
	del /Q lemon.* lempar.c parse.* 2>NUL
	del /Q mkkeywordhash.* keywordhash.h 2>NUL
	del /Q notasharedlib.* 2>NUL
	-rmdir /Q/S .deps 2>NUL
	-rmdir /Q/S .libs 2>NUL



	-rmdir /Q/S tsrc 2>NUL
	del /Q .target_source 2>NUL
	del /Q tclsqlite3.exe 2>NUL
	del /Q testloadext.dll 2>NUL
	del /Q testfixture.exe test.db 2>NUL
	del /Q LogEst.exe fts3view.exe rollback-test.exe showdb.exe 2>NUL
	del /Q changeset.exe 2>NUL

clean:	
	rm -f *.o sqlite3 sqlite3.exe libsqlite3.a sqlite3.h opcodes.*
	rm -f lemon lemon.exe lempar.c parse.* sqlite*.tar.gz
	rm -f mkkeywordhash mkkeywordhash.exe keywordhash.h
	rm -f $(PUBLISH)
	rm -f *.da *.bb *.bbg gmon.out

	rm -rf tsrc target_source
	rm -f testloadext.dll libtestloadext.so
	rm -f amalgamation-testfixture amalgamation-testfixture.exe
	rm -f fts3-testfixture fts3-testfixture.exe
	rm -f testfixture testfixture.exe
	rm -f threadtest3 threadtest3.exe
	rm -f LogEst LogEst.exe

  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);

  ** Note that the call to sqlite3ResultSetOfSelect() will expand any
  ** "*" elements in the results set of the view and will assign cursors
  ** to the elements of the FROM clause.  But we do not want these changes
  ** to be permanent.  So the computation is done on a copy of the SELECT
  ** statement that defines the view.
  */
  assert( pTable->pSelect );






  pSel = sqlite3SelectDup(db, pTable->pSelect, 0);
  if( pSel ){
    n = pParse->nTab;
    sqlite3SrcListAssignCursors(pParse, pSel->pSrc);
    pTable->nCol = -1;
    db->lookaside.bDisable++;
#ifndef SQLITE_OMIT_AUTHORIZATION
    xAuth = db->xAuth;
    db->xAuth = 0;
    pSelTab = sqlite3ResultSetOfSelect(pParse, pSel);
    db->xAuth = xAuth;
#else
    pSelTab = sqlite3ResultSetOfSelect(pParse, pSel);
#endif

    pParse->nTab = n;
    if( pTable->pCheck ){
      /* CREATE VIEW name(arglist) AS ...
      ** The names of the columns in the table are taken from
      ** arglist which is stored in pTable->pCheck.  The pCheck field
      ** normally holds CHECK constraints on an ordinary table, but for
      ** a VIEW it holds the list of column names.
      */
      sqlite3ColumnsFromExprList(pParse, pTable->pCheck, 
                                 &pTable->nCol, &pTable->aCol);
      if( db->mallocFailed==0 
       && pParse->nErr==0
       && pTable->nCol==pSel->pEList->nExpr
      ){
        sqlite3SelectAddColumnTypeAndCollation(pParse, pTable, pSel);
      }
    }else if( pSelTab ){
      /* CREATE VIEW name AS...  without an argument list.  Construct
      ** the column names from the SELECT statement that defines the view.
      */
      assert( pTable->aCol==0 );
      pTable->nCol = pSelTab->nCol;
      pTable->aCol = pSelTab->aCol;
      pSelTab->nCol = 0;
      pSelTab->aCol = 0;

      assert( sqlite3SchemaMutexHeld(db, 0, pTable->pSchema) );
    }else{
      pTable->nCol = 0;
      nErr++;
    }
    if( pSelTab ) sqlite3DeleteTable(db, pSelTab);
    sqlite3SelectDelete(db, pSel);
    db->lookaside.bDisable--;
  } else {
    nErr++;

  }
  pTable->pSchema->schemaFlags |= DB_UnresetViews;
#endif /* SQLITE_OMIT_VIEW */
  return nErr;  
}
#endif /* !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE) */

  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) */

    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.
*/
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);
    if( ExprHasProperty(p, EP_MemToken) ) sqlite3DbFree(db, p->u.zToken);
    if( ExprHasProperty(p, EP_xIsSelect) ){
      sqlite3SelectDelete(db, p->x.pSelect);
    }else{
      sqlite3ExprListDelete(db, p->x.pList);
    }
  }
  if( !ExprHasProperty(p, EP_Static) ){
    sqlite3DbFree(db, p);
  }
}
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.
*/
Expr *sqlite3ExprDup(sqlite3 *db, Expr *p, int flags){
  assert( flags==0 || flags==EXPRDUP_REDUCE );
  return p ? exprDup(db, p, flags, 0) : 0;
}
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);
}
void sqlite3ExprListDelete(sqlite3 *db, ExprList *pList){
  if( pList ) exprListDeleteNN(db, pList);
}

/*
** Return the bitwise-OR of all Expr.flags fields in the given
** ExprList.
*/
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( 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( 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.
*/
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;

**   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
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    ........ */

#ifdef SQLITE_ENABLE_ATOMIC_WRITE
  if( (iAmt+iOfst)>p->endpoint.iOffset ){
    return SQLITE_IOERR_SHORT_READ;
  }
#endif

  assert( (iAmt+iOfst)<=p->endpoint.iOffset );
  assert( p->readpoint.iOffset==0 || p->readpoint.pChunk!=0 );
  if( p->readpoint.iOffset!=iOfst || iOfst==0 ){
    sqlite3_int64 iOff = 0;
    for(pChunk=p->pFirst; 
        ALWAYS(pChunk) && (iOff+p->nChunkSize)<=iOfst;
        pChunk=pChunk->pNext
    ){
      iOff += p->nChunkSize;
    }
  }else{
    pChunk = p->readpoint.pChunk;
    assert( pChunk!=0 );
  }

  iChunkOffset = (int)(iOfst%p->nChunkSize);
  do {
    int iSpace = p->nChunkSize - iChunkOffset;
    int nCopy = MIN(nRead, (p->nChunkSize - iChunkOffset));
    memcpy(zOut, (u8*)pChunk->zChunk + iChunkOffset, nCopy);
    zOut += nCopy;
    nRead -= iSpace;
    iChunkOffset = 0;
  } while( nRead>=0 && (pChunk=pChunk->pNext)!=0 && nRead>0 );
  p->readpoint.iOffset = pChunk ? iOfst+iAmt : 0;
  p->readpoint.pChunk = pChunk;

  return SQLITE_OK;
}

/*
** Free the list of FileChunk structures headed at MemJournal.pFirst.

** routine to lower a locking level.
*/
static int unixLock(sqlite3_file *id, int eFileLock){
  /* The following describes the implementation of the various locks and
  ** lock transitions in terms of the POSIX advisory shared and exclusive
  ** lock primitives (called read-locks and write-locks below, to avoid
  ** confusion with SQLite lock names). The algorithms are complicated
  ** slightly in order to be compatible with Windows95 systems simultaneously
  ** accessing the same database file, in case that is ever required.
  **
  ** Symbols defined in os.h indentify the 'pending byte' and the 'reserved
  ** byte', each single bytes at well known offsets, and the 'shared byte
  ** range', a range of 510 bytes at a well known offset.
  **
  ** To obtain a SHARED lock, a read-lock is obtained on the 'pending
  ** byte'.  If this is successful, 'shared byte range' is read-locked
  ** and the lock on the 'pending byte' released.  (Legacy note:  When
  ** SQLite was first developed, Windows95 systems were still very common,
  ** and Widnows95 lacks a shared-lock capability.  So on Windows95, a
  ** single randomly selected by from the 'shared byte range' is locked.
  ** Windows95 is now pretty much extinct, but this work-around for the
  ** lack of shared-locks on Windows95 lives on, for backwards
  ** compatibility.)
  **
  ** A process may only obtain a RESERVED lock after it has a SHARED lock.
  ** A RESERVED lock is implemented by grabbing a write-lock on the
  ** 'reserved byte'. 
  **
  ** A process may only obtain a PENDING lock after it has obtained a
  ** SHARED lock. A PENDING lock is implemented by obtaining a write-lock
  ** on the 'pending byte'. This ensures that no new SHARED locks can be
  ** obtained, but existing SHARED locks are allowed to persist. A process
  ** does not have to obtain a RESERVED lock on the way to a PENDING lock.
  ** This property is used by the algorithm for rolling back a journal file
  ** after a crash.
  **
  ** An EXCLUSIVE lock, obtained after a PENDING lock is held, is
  ** implemented by obtaining a write-lock on the entire 'shared byte
  ** range'. Since all other locks require a read-lock on one of the bytes
  ** within this range, this ensures that no other locks are held on the
  ** database. 





  */
  int rc = SQLITE_OK;
  unixFile *pFile = (unixFile*)id;
  unixInodeInfo *pInode;
  struct flock lock;
  int tErrno = 0;

    sqlite3ErrorMsg(pParse, "unknown table option: %.*s", X.n, X.z);
  }
}
columnlist ::= columnlist COMMA columnname carglist.
columnlist ::= columnname carglist.
columnname(A) ::= nm(A) typetoken(Y). {sqlite3AddColumn(pParse,&A,&Y);}























// Define operator precedence early so that this is the first occurrence
// of the operator tokens in the grammer.  Keeping the operators together
// causes them to be assigned integer values that are close together,
// which keeps parser tables smaller.
//
// The token values assigned to these symbols is determined by the order
// in which lemon first sees them.  It must be the case that ISNULL/NOTNULL,

%right ESCAPE.
%left BITAND BITOR LSHIFT RSHIFT.
%left PLUS MINUS.
%left STAR SLASH REM.
%left CONCAT.
%left COLLATE.
%right BITNOT.

// An IDENTIFIER can be a generic identifier, or one of several
// keywords.  Any non-standard keyword can also be an identifier.
//
%token_class id  ID|INDEXED.

// The following directive causes tokens ABORT, AFTER, ASC, etc. to
// fallback to ID if they will not parse as their original value.
// This obviates the need for the "id" nonterminal.
//
%fallback ID
  ABORT ACTION AFTER ANALYZE ASC ATTACH BEFORE BEGIN BY CASCADE CAST COLUMNKW
  CONFLICT DATABASE DEFERRED DESC DETACH EACH END EXCLUSIVE EXPLAIN FAIL FOR
  IGNORE IMMEDIATE INITIALLY INSTEAD LIKE_KW MATCH NO PLAN
  QUERY KEY OF OFFSET PRAGMA RAISE RECURSIVE RELEASE REPLACE RESTRICT ROW
  ROLLBACK SAVEPOINT TEMP TRIGGER VACUUM VIEW VIRTUAL WITH WITHOUT
%ifdef SQLITE_OMIT_COMPOUND_SELECT
  EXCEPT INTERSECT UNION
%endif SQLITE_OMIT_COMPOUND_SELECT
  REINDEX RENAME CTIME_KW IF
  .
%wildcard ANY.


// And "ids" is an identifer-or-string.
//
%token_class ids  ID|STRING.

// The name of a column or table can be any of the following:
//

  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3, 0);
  spanSet(&A,&X,&Z); /*A-overwrites-X*/
  A.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4, 0);
}
term(A) ::= INTEGER|FLOAT|BLOB(X). {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
term(A) ::= STRING(X).             {spanExpr(&A,pParse,@X,X);/*A-overwrites-X*/}
expr(A) ::= VARIABLE(X).     {

  if( !(X.z[0]=='#' && sqlite3Isdigit(X.z[1])) ){
    spanExpr(&A, pParse, TK_VARIABLE, X);
    sqlite3ExprAssignVarNumber(pParse, A.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 = X; /*A-overwrites-X*/
    assert( t.n>=2 );
    spanSet(&A, &t, &t);
    if( pParse->nested==0 ){
      sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &t);
      A.pExpr = 0;
    }else{
      A.pExpr = sqlite3PExpr(pParse, TK_REGISTER, 0, 0, &t);
      if( A.pExpr ) sqlite3GetInt32(&t.z[1], &A.pExpr->iTable);
    }



  }
}
expr(A) ::= expr(A) COLLATE ids(C). {
  A.pExpr = sqlite3ExprAddCollateToken(pParse, A.pExpr, &C, 1);
  A.zEnd = &C.z[C.n];
}
%ifndef SQLITE_OMIT_CAST

      exprNot(pParse, N, &A);
    }
    A.zEnd = &E.z[E.n];
  }
  expr(A) ::= LP(B) select(X) RP(E). {
    spanSet(&A,&B,&E); /*A-overwrites-B*/
    A.pExpr = sqlite3PExpr(pParse, TK_SELECT, 0, 0, 0);



    sqlite3PExprAddSelect(pParse, A.pExpr, X);



  }
  expr(A) ::= expr(A) in_op(N) LP select(Y) RP(E).  [IN] {
    A.pExpr = sqlite3PExpr(pParse, TK_IN, A.pExpr, 0, 0);



    sqlite3PExprAddSelect(pParse, A.pExpr, Y);



    exprNot(pParse, N, &A);
    A.zEnd = &E.z[E.n];
  }
  expr(A) ::= expr(A) in_op(N) nm(Y) dbnm(Z). [IN] {
    SrcList *pSrc = sqlite3SrcListAppend(pParse->db, 0,&Y,&Z);
    Select *pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0,0);
    A.pExpr = sqlite3PExpr(pParse, TK_IN, A.pExpr, 0, 0);



    sqlite3PExprAddSelect(pParse, A.pExpr, pSelect);



    exprNot(pParse, N, &A);
    A.zEnd = Z.z ? &Z.z[Z.n] : &Y.z[Y.n];
  }
  expr(A) ::= EXISTS(B) LP select(Y) RP(E). {
    Expr *p;
    spanSet(&A,&B,&E); /*A-overwrites-B*/
    p = A.pExpr = sqlite3PExpr(pParse, TK_EXISTS, 0, 0, 0);



    sqlite3PExprAddSelect(pParse, p, Y);



  }
%endif SQLITE_OMIT_SUBQUERY

/* CASE expressions */
expr(A) ::= CASE(C) case_operand(X) case_exprlist(Y) case_else(Z) END(E). {
  spanSet(&A,&C,&E);  /*A-overwrites-C*/
  A.pExpr = sqlite3PExpr(pParse, TK_CASE, X, 0, 0);

** The column list presumably came from selectColumnNamesFromExprList().
** The column list has only names, not types or collations.  This
** routine goes through and adds the types and collations.
**
** This routine requires that all identifiers in the SELECT
** statement be resolved.
*/
void sqlite3SelectAddColumnTypeAndCollation(
  Parse *pParse,        /* Parsing contexts */
  Table *pTab,          /* Add column type information to this table */
  Select *pSelect       /* SELECT used to determine types and collations */
){
  sqlite3 *db = pParse->db;
  NameContext sNC;
  Column *pCol;

  assert( (pSelect->selFlags & SF_Resolved)!=0 );
  assert( pTab->nCol==pSelect->pEList->nExpr || db->mallocFailed );
  if( db->mallocFailed ) return;
  memset(&sNC, 0, sizeof(sNC));
  sNC.pSrcList = pSelect->pSrc;
  a = pSelect->pEList->a;
  for(i=0, pCol=pTab->aCol; i<pTab->nCol; i++, pCol++){
    const char *zType;
    int n, m;
    p = a[i].pExpr;
    zType = columnType(&sNC, p, 0, 0, 0, &pCol->szEst);
    szAll += pCol->szEst;
    pCol->affinity = sqlite3ExprAffinity(p);
    if( zType && (m = sqlite3Strlen30(zType))>0 ){
      n = sqlite3Strlen30(pCol->zName);
      pCol->zName = sqlite3DbReallocOrFree(db, pCol->zName, n+m+2);
      if( pCol->zName ){
        memcpy(&pCol->zName[n+1], zType, m+1);
        pCol->colFlags |= COLFLAG_HASTYPE;
      }
    }
    if( pCol->affinity==0 ) pCol->affinity = SQLITE_AFF_BLOB;
    pColl = sqlite3ExprCollSeq(pParse, p);
    if( pColl && pCol->zColl==0 ){
      pCol->zColl = sqlite3DbStrDup(db, pColl->zName);
    }
  }
  pTab->szTabRow = sqlite3LogEst(szAll*4);

  /* The sqlite3ResultSetOfSelect() is only used n contexts where lookaside
  ** is disabled */
  assert( db->lookaside.bDisable );
  pTab->nRef = 1;
  pTab->zName = 0;
  pTab->nRowLogEst = 200; assert( 200==sqlite3LogEst(1048576) );
  sqlite3ColumnsFromExprList(pParse, pSelect->pEList, &pTab->nCol, &pTab->aCol);
  sqlite3SelectAddColumnTypeAndCollation(pParse, pTab, pSelect);
  pTab->iPKey = -1;
  if( db->mallocFailed ){
    sqlite3DeleteTable(db, pTab);
    return 0;
  }
  return pTab;
}

    Table *pTab = pFrom->pTab;
    assert( pTab!=0 );
    if( (pTab->tabFlags & TF_Ephemeral)!=0 ){
      /* A sub-query in the FROM clause of a SELECT */
      Select *pSel = pFrom->pSelect;
      if( pSel ){
        while( pSel->pPrior ) pSel = pSel->pPrior;
        sqlite3SelectAddColumnTypeAndCollation(pParse, pTab, pSel);
      }
    }
  }
}
#endif

  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_EXPERIMENTAL int sqlite3_snapshot_open(
  sqlite3 *db,

  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 */

# 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
int sqlite3IsIdChar(u8);
#endif

/*
** Internal function prototypes

  void sqlite3TreeViewSelect(TreeView*, const Select*, u8);
  void sqlite3TreeViewWith(TreeView*, const With*, u8);
#endif


void sqlite3SetString(char **, sqlite3*, const char*);
void sqlite3ErrorMsg(Parse*, const char*, ...);
void sqlite3Dequote(char*);
void sqlite3TokenInit(Token*,char*);
int sqlite3KeywordCode(const unsigned char*, int);
int sqlite3RunParser(Parse*, const char*, char **);
void sqlite3FinishCoding(Parse*);
int sqlite3GetTempReg(Parse*);
void sqlite3ReleaseTempReg(Parse*,int);
int sqlite3GetTempRange(Parse*,int);
void sqlite3ReleaseTempRange(Parse*,int,int);
void sqlite3ClearTempRegCache(Parse*);
#ifdef SQLITE_DEBUG
int sqlite3NoTempsInRange(Parse*,int,int);
#endif
Expr *sqlite3ExprAlloc(sqlite3*,int,const Token*,int);
Expr *sqlite3Expr(sqlite3*,int,const char*);
void sqlite3ExprAttachSubtrees(sqlite3*,Expr*,Expr*,Expr*);
Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*, const Token*);
void sqlite3PExprAddSelect(Parse*, Expr*, Select*);
Expr *sqlite3ExprAnd(sqlite3*,Expr*, Expr*);
Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*);
void sqlite3ExprAssignVarNumber(Parse*, Expr*);
void sqlite3ExprDelete(sqlite3*, Expr*);
ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*);
void sqlite3ExprListSetSortOrder(ExprList*,int);
void sqlite3ExprListSetName(Parse*,ExprList*,Token*,int);
void sqlite3ExprListSetSpan(Parse*,ExprList*,ExprSpan*);
void sqlite3ExprListDelete(sqlite3*, ExprList*);
u32 sqlite3ExprListFlags(const ExprList*);
int sqlite3Init(sqlite3*, char**);
int sqlite3InitCallback(void*, int, char**, char**);
void sqlite3Pragma(Parse*,Token*,Token*,Token*,int);
void sqlite3ResetAllSchemasOfConnection(sqlite3*);
void sqlite3ResetOneSchema(sqlite3*,int);
void sqlite3CollapseDatabaseArray(sqlite3*);
void sqlite3CommitInternalChanges(sqlite3*);
void sqlite3DeleteColumnNames(sqlite3*,Table*);
int sqlite3ColumnsFromExprList(Parse*,ExprList*,i16*,Column**);
void sqlite3SelectAddColumnTypeAndCollation(Parse*,Table*,Select*);
Table *sqlite3ResultSetOfSelect(Parse*,Select*);
void sqlite3OpenMasterTable(Parse *, int);
Index *sqlite3PrimaryKeyIndex(Table*);
i16 sqlite3ColumnOfIndex(Index*, i16);
void sqlite3StartTable(Parse*,Token*,Token*,int,int,int,int);
#if SQLITE_ENABLE_HIDDEN_COLUMNS
  void sqlite3ColumnPropertiesFromName(Table*, Column*);

** 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".
*/
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
*/
void sqlite3TokenInit(Token *p, char *z){
  p->z = z;

** Convert a LogEst into an integer.
**
** Note that this routine is only used when one or more of various
** non-standard compile-time options is enabled.
*/
u64 sqlite3LogEstToInt(LogEst x){
  u64 n;

  n = x%10;
  x /= 10;
  if( n>=5 ) n -= 2;
  else if( n>=1 ) n -= 1;
#if defined(SQLITE_ENABLE_STMT_SCANSTATUS) || \
    defined(SQLITE_EXPLAIN_ESTIMATED_ROWS)
  if( x>60 ) return (u64)LARGEST_INT64;

        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 ){

        len -= pRec->u.nZero;
      }
    }
    nData += len;
    testcase( serial_type==127 );
    testcase( serial_type==128 );
    nHdr += serial_type<=127 ? 1 : sqlite3VarintLen(serial_type);
    if( pRec==pData0 ) break;
    pRec--;
  }while(1);

  /* EVIDENCE-OF: R-22564-11647 The header begins with a single varint
  ** which determines the total number of bytes in the header. The varint
  ** value is the size of the header in bytes including the size varint
  ** itself. */
  testcase( nHdr==126 );
  testcase( nHdr==127 );

    ** 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 */

** 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 */

**
** (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) );
}

static void vdbeFreeOpArray(sqlite3 *, Op *, int);

/*
** Delete a P4 value if necessary.
*/
static void freeP4(sqlite3 *db, int p4type, void *p4){

  assert( db );
  switch( p4type ){
    case P4_FUNCCTX: {
      freeEphemeralFunction(db, ((sqlite3_context*)p4)->pFunc);
      /* Fall through into the next case */
    }
    case P4_REAL:
    case P4_INT64:
    case P4_DYNAMIC:
    case P4_INTARRAY: {
      sqlite3DbFree(db, p4);
      break;
    }
    case P4_KEYINFO: {
      if( db->pnBytesFreed==0 ) sqlite3KeyInfoUnref((KeyInfo*)p4);
      break;
    }
#ifdef SQLITE_ENABLE_CURSOR_HINTS
    case P4_EXPR: {
      sqlite3ExprDelete(db, (Expr*)p4);
      break;
    }
#endif
    case P4_MPRINTF: {
      if( db->pnBytesFreed==0 ) sqlite3_free(p4);
      break;
    }
    case P4_FUNCDEF: {
      freeEphemeralFunction(db, (FuncDef*)p4);
      break;
    }
    case P4_MEM: {
      if( db->pnBytesFreed==0 ){
        sqlite3ValueFree((sqlite3_value*)p4);
      }else{
        Mem *p = (Mem*)p4;
        if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
        sqlite3DbFree(db, p);
      }
      break;
    }
    case P4_VTAB : {
      if( db->pnBytesFreed==0 ) sqlite3VtabUnlock((VTable *)p4);
      break;

    }
  }
}

/*
** Free the space allocated for aOp and any p4 values allocated for the
** opcodes contained within. If aOp is not NULL it is assumed to contain 

#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;

            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
  ){

    0 0 0 {USE TEMP B-TREE FOR ORDER BY}
  }

  do_eqp_test 2.2.$mode.6 { 
    SELECT rowid FROM t1 WHERE a IN ('one', 'four') ORDER BY +rowid
  } $plan($mode)
}

# 2016-04-09.
# Demonstrate a register overwrite problem when using two virtual
# tables where the outer loop uses the IN operator.
#
set G(collist) [list PrimaryKey flagA columnA]
set G(cols) [join $G(collist) ,]
set G(nulls) "NULL"

proc vtab_command {method args} {
  global G

  switch -- $method {
    xConnect {
      return "CREATE TABLE t1($G(cols))"
    }

    xBestIndex {
      set clist [lindex $args 0]
      #puts $clist
      set W [list]
      set U [list]

      set i 0
      for {set idx 0} {$idx < [llength $clist]} {incr idx} {
        array set c [lindex $clist $idx]
        if {$c(op)=="eq" && $c(usable)} {
          lappend W "[lindex $G(collist) $c(column)] = %$i%"
          lappend U use $idx
          incr i
        }
      }

      if {$W==""} {
        set sql "SELECT rowid, * FROM t1"
      } else {
        set sql "SELECT rowid, * FROM t1 WHERE [join $W { AND }]"
      }

      return [concat [list idxstr $sql] $U]
    }

    xFilter {
      foreach {idxnum idxstr vals} $args {}

      set map [list]
      for {set i 0} {$i < [llength $vals]} {incr i} {
        lappend map "%$i%" 
        set v [lindex $vals $i]
        if {[string is integer $v]} { 
          lappend map $v 
        } else {
          lappend map "'$v'"
        }
      }
      set sql [string map $map $idxstr]

      #puts "SQL: $sql"
      return [list sql $sql]
    }
  }

  return {}
}

db close
forcedelete test.db
sqlite3 db test.db
register_tcl_module db

do_execsql_test 3.1 "
  CREATE TABLE t1($G(cols));
  INSERT INTO t1 VALUES(1, 0, 'ValueA');
  INSERT INTO t1 VALUES(2, 0, 'ValueA');
  INSERT INTO t1 VALUES(3, 0, 'ValueB');
  INSERT INTO t1 VALUES(4, 0, 'ValueB');
"

do_execsql_test 3.2 {
  CREATE VIRTUAL TABLE VirtualTableA USING tcl(vtab_command);
  CREATE VIRTUAL TABLE VirtualTableB USING tcl(vtab_command);
}

do_execsql_test 3.3 { SELECT primarykey FROM VirtualTableA } {1 2 3 4}

do_execsql_test 3.4 {
  SELECT * FROM 
  VirtualTableA a CROSS JOIN VirtualTableB b ON b.PrimaryKey=a.PrimaryKey
  WHERE a.ColumnA IN ('ValueA', 'ValueB') AND a.FlagA=0
} {
  1 0 ValueA 1 0 ValueA
  2 0 ValueA 2 0 ValueA
  3 0 ValueB 3 0 ValueB
  4 0 ValueB 4 0 ValueB
}

do_execsql_test 3.5 {
  SELECT * FROM 
  VirtualTableA a CROSS JOIN VirtualTableB b ON b.PrimaryKey=a.PrimaryKey
  WHERE a.FlagA=0 AND a.ColumnA IN ('ValueA', 'ValueB') 
} {
  1 0 ValueA 1 0 ValueA
  2 0 ValueA 2 0 ValueA
  3 0 ValueB 3 0 ValueB
  4 0 ValueB 4 0 ValueB
}


finish_test

  INSERT INTO t4 VALUES(14, 'abcde','xyzzy');
  CREATE INDEX idx_t4_3 ON t4 (col0);
  CREATE INDEX idx_t4_0 ON t4 (col1, col0);
  DELETE FROM t4 WHERE col0=69 OR col0>7;
  PRAGMA integrity_check;
} {ok}

# 2016-04-09
# Ticket https://sqlite.org/src/info/a306e56ff68b8fa5
# Failure to completely delete when reverse_unordered_selects is
# engaged.
#
db close
forcedelete test.db
sqlite3 db test.db
do_execsql_test 5.0 {
  PRAGMA page_size=1024;
  CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c);
  CREATE INDEX x1 ON t1(b, c);
  INSERT INTO t1(a,b,c) VALUES(1, 1, zeroblob(80));
  INSERT INTO t1(a,b,c) SELECT a+1, 1, c FROM t1;
  INSERT INTO t1(a,b,c) SELECT a+2, 1, c FROM t1;
  INSERT INTO t1(a,b,c) SELECT a+10, 2, c FROM t1 WHERE b=1;
  INSERT INTO t1(a,b,c) SELECT a+20, 3, c FROM t1 WHERE b=1;
  PRAGMA reverse_unordered_selects = ON;
  DELETE FROM t1 WHERE b=2;
  SELECT a FROM t1 WHERE b=2;
} {}

finish_test

        INSERT INTO t2 VALUES($a,$b,$c);
        ROLLBACK TO x2;
      }
    }
  } msg]
  list $rc $msg [db eval {SELECT * FROM t2}]
} {1 {abort due to ROLLBACK} {}}

# Ticket: https://www.sqlite.org/src/tktview/7f7f8026eda387d544b
# Segfault in the in-memory journal logic triggered by a tricky
# combination of SAVEPOINT operations.
#
unset -nocomplain i
for {set i 248} {$i<=253} {incr i} {
  do_test savepoint7-3.$i {
    db close
    forcedelete test.db
    sqlite3 db test.db
    db eval {
      PRAGMA page_size=1024;
      PRAGMA temp_store=MEMORY;
      BEGIN;
      CREATE TABLE t1(x INTEGER PRIMARY KEY, y TEXT);
      WITH RECURSIVE c(x) AS (VALUES(1) UNION SELECT x+1 FROM c WHERE x<$::i)
      INSERT INTO t1(x,y) SELECT x*10, printf('%04d%.800c',x,'*') FROM c;
      SAVEPOINT one;
        SELECT count(*) FROM t1;
        WITH RECURSIVE c(x) AS (VALUES(1) UNION SELECT x+1 FROM c WHERE x<$::i)
        INSERT INTO t1(x,y) SELECT x*10+1, printf('%04d%.800c',x,'*') FROM c;
      ROLLBACK TO one;
        SELECT count(*) FROM t1;
        SAVEPOINT twoB;
          WITH RECURSIVE c(x) AS (VALUES(1) UNION SELECT x+1 FROM c WHERE x<10)
          INSERT INTO t1(x,y) SELECT x*10+2, printf('%04d%.800c',x,'*') FROM c;
        ROLLBACK TO twoB;
      RELEASE one;
      COMMIT;
    }
  } [list $i $i]
}


finish_test

do_test view-1.8 {
  db close
  sqlite3 db test.db
  execsql {
    SELECT * FROM v1 ORDER BY a;
  }
} {2 3 5 6 8 9}

do_execsql_test view-1.10 {
  CREATE TABLE t9(x INTEGER);
  CREATE VIEW v9a AS SELECT x FROM t9;
  CREATE VIEW v9b AS SELECT * FROM t9;
  CREATE VIEW v9c(x) AS SELECT x FROM t9;
  CREATE VIEW v9d(x) AS SELECT * FROM t9;
} {}
do_execsql_test view-1.11 {
  PRAGMA table_info(v9a);
} {0 x INTEGER 0 {} 0}
do_execsql_test view-1.12 {
  PRAGMA table_info(v9b);
} {0 x INTEGER 0 {} 0}
do_execsql_test view-1.13 {
  PRAGMA table_info(v9c);
} {0 x INTEGER 0 {} 0}
do_execsql_test view-1.14 {
  PRAGMA table_info(v9d);
} {0 x INTEGER 0 {} 0}

do_test view-2.1 {
  execsql {
    CREATE VIEW v2 AS SELECT * FROM t1 WHERE a>5
  };  # No semicolon
  execsql2 {
    SELECT * FROM v2;

#
# We go to the trouble of making some OP_ values the same as TK_ values
# as an optimization.  During parsing, things like expression operators
# are coded with TK_ values such as TK_ADD, TK_DIVIDE, and so forth.  Later
# during code generation, we need to generate corresponding opcodes like
# OP_Add and OP_Divide.  By making TK_ADD==OP_Add and TK_DIVIDE==OP_Divide,
# code to translate from one to the other is avoided.  This makes the
# code generator smaller and faster.

#
# This script also scans for lines of the form:
#
#       case OP_aaaa:       /* jump, in1, in2, in3, out2-prerelease, out3 */
#
# When such comments are found on an opcode, it means that certain
# properties apply to that opcode.  Set corresponding flags using the

    while {[info exists used($cnt)]} {incr cnt}
    set op($name) $cnt
    set used($cnt) 1
    set def($cnt) $name
  }
}

# Assign the next group of values to JUMP opcodes
#
for {set i 0} {$i<$nOp} {incr i} {
  set name $order($i)
  if {$op($name)>=0} continue
  if {!$jump($name)} continue
  incr cnt
  while {[info exists used($cnt)]} {incr cnt}
  set op($name) $cnt
  set used($cnt) 1
  set def($cnt) $name
}

# Find the numeric value for the largest JUMP opcode
#
set mxJump -1
for {set i 0} {$i<$nOp} {incr i} {
  set name $order($i)
  if {$jump($name) && $op($name)>$mxJump} {set mxJump $op($name)}
}


# Generate the numeric values for all remaining opcodes
#
for {set i 0} {$i<$nOp} {incr i} {
  set name $order($i)
  if {$op($name)<0} {
    incr cnt
    while {[info exists used($cnt)]} {incr cnt}
    set op($name) $cnt

  }
  puts -nonewline [format " 0x%02x," $bv($i)]
  if {$i%8==7} {
    puts "\\"
  }
}
puts "\175"
puts ""
puts "/* The sqlite3P2Values() routine is able to run faster if it knows"
puts "** the value of the largest JUMP opcode.  The smaller the maximum"
puts "** JUMP opcode the better, so the mkopcodeh.tcl script that"
puts "** generated this include file strives to group all JUMP opcodes"
puts "** together near the beginning of the list."
puts "*/"
puts "#define SQLITE_MX_JUMP_OPCODE  $mxJump  /* Maximum JUMP opcode */"