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-rw-r--r--ext/sqlite/libsqlite/src/expr.c1662
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diff --git a/ext/sqlite/libsqlite/src/expr.c b/ext/sqlite/libsqlite/src/expr.c
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-/*
-** 2001 September 15
-**
-** The author disclaims copyright to this source code. In place of
-** a legal notice, here is a blessing:
-**
-** May you do good and not evil.
-** May you find forgiveness for yourself and forgive others.
-** May you share freely, never taking more than you give.
-**
-*************************************************************************
-** This file contains routines used for analyzing expressions and
-** for generating VDBE code that evaluates expressions in SQLite.
-**
-** $Id$
-*/
-#include "sqliteInt.h"
-#include <ctype.h>
-
-/*
-** Construct a new expression node and return a pointer to it. Memory
-** for this node is obtained from sqliteMalloc(). The calling function
-** is responsible for making sure the node eventually gets freed.
-*/
-Expr *sqliteExpr(int op, Expr *pLeft, Expr *pRight, Token *pToken){
- Expr *pNew;
- pNew = sqliteMalloc( sizeof(Expr) );
- if( pNew==0 ){
- /* When malloc fails, we leak memory from pLeft and pRight */
- return 0;
- }
- pNew->op = op;
- pNew->pLeft = pLeft;
- pNew->pRight = pRight;
- if( pToken ){
- assert( pToken->dyn==0 );
- pNew->token = *pToken;
- pNew->span = *pToken;
- }else{
- assert( pNew->token.dyn==0 );
- assert( pNew->token.z==0 );
- assert( pNew->token.n==0 );
- if( pLeft && pRight ){
- sqliteExprSpan(pNew, &pLeft->span, &pRight->span);
- }else{
- pNew->span = pNew->token;
- }
- }
- return pNew;
-}
-
-/*
-** Set the Expr.span field of the given expression to span all
-** text between the two given tokens.
-*/
-void sqliteExprSpan(Expr *pExpr, Token *pLeft, Token *pRight){
- assert( pRight!=0 );
- assert( pLeft!=0 );
- /* Note: pExpr might be NULL due to a prior malloc failure */
- if( pExpr && pRight->z && pLeft->z ){
- if( pLeft->dyn==0 && pRight->dyn==0 ){
- pExpr->span.z = pLeft->z;
- pExpr->span.n = pRight->n + Addr(pRight->z) - Addr(pLeft->z);
- }else{
- pExpr->span.z = 0;
- }
- }
-}
-
-/*
-** Construct a new expression node for a function with multiple
-** arguments.
-*/
-Expr *sqliteExprFunction(ExprList *pList, Token *pToken){
- Expr *pNew;
- pNew = sqliteMalloc( sizeof(Expr) );
- if( pNew==0 ){
- /* sqliteExprListDelete(pList); // Leak pList when malloc fails */
- return 0;
- }
- pNew->op = TK_FUNCTION;
- pNew->pList = pList;
- if( pToken ){
- assert( pToken->dyn==0 );
- pNew->token = *pToken;
- }else{
- pNew->token.z = 0;
- }
- pNew->span = pNew->token;
- return pNew;
-}
-
-/*
-** Recursively delete an expression tree.
-*/
-void sqliteExprDelete(Expr *p){
- if( p==0 ) return;
- if( p->span.dyn ) sqliteFree((char*)p->span.z);
- if( p->token.dyn ) sqliteFree((char*)p->token.z);
- sqliteExprDelete(p->pLeft);
- sqliteExprDelete(p->pRight);
- sqliteExprListDelete(p->pList);
- sqliteSelectDelete(p->pSelect);
- sqliteFree(p);
-}
-
-
-/*
-** The following group of routines make deep copies of expressions,
-** expression lists, ID lists, and select statements. The copies can
-** be deleted (by being passed to their respective ...Delete() routines)
-** without effecting the originals.
-**
-** The expression list, ID, and source lists return by sqliteExprListDup(),
-** sqliteIdListDup(), and sqliteSrcListDup() can not be further expanded
-** by subsequent calls to sqlite*ListAppend() routines.
-**
-** Any tables that the SrcList might point to are not duplicated.
-*/
-Expr *sqliteExprDup(Expr *p){
- Expr *pNew;
- if( p==0 ) return 0;
- pNew = sqliteMallocRaw( sizeof(*p) );
- if( pNew==0 ) return 0;
- memcpy(pNew, p, sizeof(*pNew));
- if( p->token.z!=0 ){
- pNew->token.z = sqliteStrNDup(p->token.z, p->token.n);
- pNew->token.dyn = 1;
- }else{
- assert( pNew->token.z==0 );
- }
- pNew->span.z = 0;
- pNew->pLeft = sqliteExprDup(p->pLeft);
- pNew->pRight = sqliteExprDup(p->pRight);
- pNew->pList = sqliteExprListDup(p->pList);
- pNew->pSelect = sqliteSelectDup(p->pSelect);
- return pNew;
-}
-void sqliteTokenCopy(Token *pTo, Token *pFrom){
- if( pTo->dyn ) sqliteFree((char*)pTo->z);
- if( pFrom->z ){
- pTo->n = pFrom->n;
- pTo->z = sqliteStrNDup(pFrom->z, pFrom->n);
- pTo->dyn = 1;
- }else{
- pTo->z = 0;
- }
-}
-ExprList *sqliteExprListDup(ExprList *p){
- ExprList *pNew;
- struct ExprList_item *pItem;
- int i;
- if( p==0 ) return 0;
- pNew = sqliteMalloc( sizeof(*pNew) );
- if( pNew==0 ) return 0;
- pNew->nExpr = pNew->nAlloc = p->nExpr;
- pNew->a = pItem = sqliteMalloc( p->nExpr*sizeof(p->a[0]) );
- if( pItem==0 ){
- sqliteFree(pNew);
- return 0;
- }
- for(i=0; i<p->nExpr; i++, pItem++){
- Expr *pNewExpr, *pOldExpr;
- pItem->pExpr = pNewExpr = sqliteExprDup(pOldExpr = p->a[i].pExpr);
- if( pOldExpr->span.z!=0 && pNewExpr ){
- /* Always make a copy of the span for top-level expressions in the
- ** expression list. The logic in SELECT processing that determines
- ** the names of columns in the result set needs this information */
- sqliteTokenCopy(&pNewExpr->span, &pOldExpr->span);
- }
- assert( pNewExpr==0 || pNewExpr->span.z!=0
- || pOldExpr->span.z==0 || sqlite_malloc_failed );
- pItem->zName = sqliteStrDup(p->a[i].zName);
- pItem->sortOrder = p->a[i].sortOrder;
- pItem->isAgg = p->a[i].isAgg;
- pItem->done = 0;
- }
- return pNew;
-}
-SrcList *sqliteSrcListDup(SrcList *p){
- SrcList *pNew;
- int i;
- int nByte;
- if( p==0 ) return 0;
- nByte = sizeof(*p) + (p->nSrc>0 ? sizeof(p->a[0]) * (p->nSrc-1) : 0);
- pNew = sqliteMallocRaw( nByte );
- if( pNew==0 ) return 0;
- pNew->nSrc = pNew->nAlloc = p->nSrc;
- for(i=0; i<p->nSrc; i++){
- struct SrcList_item *pNewItem = &pNew->a[i];
- struct SrcList_item *pOldItem = &p->a[i];
- pNewItem->zDatabase = sqliteStrDup(pOldItem->zDatabase);
- pNewItem->zName = sqliteStrDup(pOldItem->zName);
- pNewItem->zAlias = sqliteStrDup(pOldItem->zAlias);
- pNewItem->jointype = pOldItem->jointype;
- pNewItem->iCursor = pOldItem->iCursor;
- pNewItem->pTab = 0;
- pNewItem->pSelect = sqliteSelectDup(pOldItem->pSelect);
- pNewItem->pOn = sqliteExprDup(pOldItem->pOn);
- pNewItem->pUsing = sqliteIdListDup(pOldItem->pUsing);
- }
- return pNew;
-}
-IdList *sqliteIdListDup(IdList *p){
- IdList *pNew;
- int i;
- if( p==0 ) return 0;
- pNew = sqliteMallocRaw( sizeof(*pNew) );
- if( pNew==0 ) return 0;
- pNew->nId = pNew->nAlloc = p->nId;
- pNew->a = sqliteMallocRaw( p->nId*sizeof(p->a[0]) );
- if( pNew->a==0 ) return 0;
- for(i=0; i<p->nId; i++){
- struct IdList_item *pNewItem = &pNew->a[i];
- struct IdList_item *pOldItem = &p->a[i];
- pNewItem->zName = sqliteStrDup(pOldItem->zName);
- pNewItem->idx = pOldItem->idx;
- }
- return pNew;
-}
-Select *sqliteSelectDup(Select *p){
- Select *pNew;
- if( p==0 ) return 0;
- pNew = sqliteMallocRaw( sizeof(*p) );
- if( pNew==0 ) return 0;
- pNew->isDistinct = p->isDistinct;
- pNew->pEList = sqliteExprListDup(p->pEList);
- pNew->pSrc = sqliteSrcListDup(p->pSrc);
- pNew->pWhere = sqliteExprDup(p->pWhere);
- pNew->pGroupBy = sqliteExprListDup(p->pGroupBy);
- pNew->pHaving = sqliteExprDup(p->pHaving);
- pNew->pOrderBy = sqliteExprListDup(p->pOrderBy);
- pNew->op = p->op;
- pNew->pPrior = sqliteSelectDup(p->pPrior);
- pNew->nLimit = p->nLimit;
- pNew->nOffset = p->nOffset;
- pNew->zSelect = 0;
- pNew->iLimit = -1;
- pNew->iOffset = -1;
- return pNew;
-}
-
-
-/*
-** Add a new element to the end of an expression list. If pList is
-** initially NULL, then create a new expression list.
-*/
-ExprList *sqliteExprListAppend(ExprList *pList, Expr *pExpr, Token *pName){
- if( pList==0 ){
- pList = sqliteMalloc( sizeof(ExprList) );
- if( pList==0 ){
- /* sqliteExprDelete(pExpr); // Leak memory if malloc fails */
- return 0;
- }
- assert( pList->nAlloc==0 );
- }
- if( pList->nAlloc<=pList->nExpr ){
- pList->nAlloc = pList->nAlloc*2 + 4;
- pList->a = sqliteRealloc(pList->a, pList->nAlloc*sizeof(pList->a[0]));
- if( pList->a==0 ){
- /* sqliteExprDelete(pExpr); // Leak memory if malloc fails */
- pList->nExpr = pList->nAlloc = 0;
- return pList;
- }
- }
- assert( pList->a!=0 );
- if( pExpr || pName ){
- struct ExprList_item *pItem = &pList->a[pList->nExpr++];
- memset(pItem, 0, sizeof(*pItem));
- pItem->pExpr = pExpr;
- if( pName ){
- sqliteSetNString(&pItem->zName, pName->z, pName->n, 0);
- sqliteDequote(pItem->zName);
- }
- }
- return pList;
-}
-
-/*
-** Delete an entire expression list.
-*/
-void sqliteExprListDelete(ExprList *pList){
- int i;
- if( pList==0 ) return;
- assert( pList->a!=0 || (pList->nExpr==0 && pList->nAlloc==0) );
- assert( pList->nExpr<=pList->nAlloc );
- for(i=0; i<pList->nExpr; i++){
- sqliteExprDelete(pList->a[i].pExpr);
- sqliteFree(pList->a[i].zName);
- }
- sqliteFree(pList->a);
- sqliteFree(pList);
-}
-
-/*
-** Walk an expression tree. Return 1 if the expression is constant
-** and 0 if it involves variables.
-**
-** For the purposes of this function, a double-quoted string (ex: "abc")
-** is considered a variable but a single-quoted string (ex: 'abc') is
-** a constant.
-*/
-int sqliteExprIsConstant(Expr *p){
- switch( p->op ){
- case TK_ID:
- case TK_COLUMN:
- case TK_DOT:
- case TK_FUNCTION:
- return 0;
- case TK_NULL:
- case TK_STRING:
- case TK_INTEGER:
- case TK_FLOAT:
- case TK_VARIABLE:
- return 1;
- default: {
- if( p->pLeft && !sqliteExprIsConstant(p->pLeft) ) return 0;
- if( p->pRight && !sqliteExprIsConstant(p->pRight) ) return 0;
- if( p->pList ){
- int i;
- for(i=0; i<p->pList->nExpr; i++){
- if( !sqliteExprIsConstant(p->pList->a[i].pExpr) ) return 0;
- }
- }
- return p->pLeft!=0 || p->pRight!=0 || (p->pList && p->pList->nExpr>0);
- }
- }
- return 0;
-}
-
-/*
-** If the given expression codes a constant integer that is small enough
-** to fit in a 32-bit integer, return 1 and put the value of the integer
-** in *pValue. If the expression is not an integer or if it is too big
-** to fit in a signed 32-bit integer, return 0 and leave *pValue unchanged.
-*/
-int sqliteExprIsInteger(Expr *p, int *pValue){
- switch( p->op ){
- case TK_INTEGER: {
- if( sqliteFitsIn32Bits(p->token.z) ){
- *pValue = atoi(p->token.z);
- return 1;
- }
- break;
- }
- case TK_STRING: {
- const char *z = p->token.z;
- int n = p->token.n;
- if( n>0 && z[0]=='-' ){ z++; n--; }
- while( n>0 && *z && isdigit(*z) ){ z++; n--; }
- if( n==0 && sqliteFitsIn32Bits(p->token.z) ){
- *pValue = atoi(p->token.z);
- return 1;
- }
- break;
- }
- case TK_UPLUS: {
- return sqliteExprIsInteger(p->pLeft, pValue);
- }
- case TK_UMINUS: {
- int v;
- if( sqliteExprIsInteger(p->pLeft, &v) ){
- *pValue = -v;
- return 1;
- }
- break;
- }
- default: break;
- }
- return 0;
-}
-
-/*
-** Return TRUE if the given string is a row-id column name.
-*/
-int sqliteIsRowid(const char *z){
- if( sqliteStrICmp(z, "_ROWID_")==0 ) return 1;
- if( sqliteStrICmp(z, "ROWID")==0 ) return 1;
- if( sqliteStrICmp(z, "OID")==0 ) return 1;
- return 0;
-}
-
-/*
-** Given the name of a column of the form X.Y.Z or Y.Z or just Z, look up
-** that name in the set of source tables in pSrcList and make the pExpr
-** expression node refer back to that source column. The following changes
-** are made to pExpr:
-**
-** pExpr->iDb Set the index in db->aDb[] of the database holding
-** the table.
-** pExpr->iTable Set to the cursor number for the table obtained
-** from pSrcList.
-** pExpr->iColumn Set to the column number within the table.
-** pExpr->dataType Set to the appropriate data type for the column.
-** pExpr->op Set to TK_COLUMN.
-** pExpr->pLeft Any expression this points to is deleted
-** pExpr->pRight Any expression this points to is deleted.
-**
-** The pDbToken is the name of the database (the "X"). This value may be
-** NULL meaning that name is of the form Y.Z or Z. Any available database
-** can be used. The pTableToken is the name of the table (the "Y"). This
-** value can be NULL if pDbToken is also NULL. If pTableToken is NULL it
-** means that the form of the name is Z and that columns from any table
-** can be used.
-**
-** If the name cannot be resolved unambiguously, leave an error message
-** in pParse and return non-zero. Return zero on success.
-*/
-static int lookupName(
- Parse *pParse, /* The parsing context */
- Token *pDbToken, /* Name of the database containing table, or NULL */
- Token *pTableToken, /* Name of table containing column, or NULL */
- Token *pColumnToken, /* Name of the column. */
- SrcList *pSrcList, /* List of tables used to resolve column names */
- ExprList *pEList, /* List of expressions used to resolve "AS" */
- Expr *pExpr /* Make this EXPR node point to the selected column */
-){
- char *zDb = 0; /* Name of the database. The "X" in X.Y.Z */
- char *zTab = 0; /* Name of the table. The "Y" in X.Y.Z or Y.Z */
- char *zCol = 0; /* Name of the column. The "Z" */
- int i, j; /* Loop counters */
- int cnt = 0; /* Number of matching column names */
- int cntTab = 0; /* Number of matching table names */
- sqlite *db = pParse->db; /* The database */
-
- assert( pColumnToken && pColumnToken->z ); /* The Z in X.Y.Z cannot be NULL */
- if( pDbToken && pDbToken->z ){
- zDb = sqliteStrNDup(pDbToken->z, pDbToken->n);
- sqliteDequote(zDb);
- }else{
- zDb = 0;
- }
- if( pTableToken && pTableToken->z ){
- zTab = sqliteStrNDup(pTableToken->z, pTableToken->n);
- sqliteDequote(zTab);
- }else{
- assert( zDb==0 );
- zTab = 0;
- }
- zCol = sqliteStrNDup(pColumnToken->z, pColumnToken->n);
- sqliteDequote(zCol);
- if( sqlite_malloc_failed ){
- return 1; /* Leak memory (zDb and zTab) if malloc fails */
- }
- assert( zTab==0 || pEList==0 );
-
- pExpr->iTable = -1;
- for(i=0; i<pSrcList->nSrc; i++){
- struct SrcList_item *pItem = &pSrcList->a[i];
- Table *pTab = pItem->pTab;
- Column *pCol;
-
- if( pTab==0 ) continue;
- assert( pTab->nCol>0 );
- if( zTab ){
- if( pItem->zAlias ){
- char *zTabName = pItem->zAlias;
- if( sqliteStrICmp(zTabName, zTab)!=0 ) continue;
- }else{
- char *zTabName = pTab->zName;
- if( zTabName==0 || sqliteStrICmp(zTabName, zTab)!=0 ) continue;
- if( zDb!=0 && sqliteStrICmp(db->aDb[pTab->iDb].zName, zDb)!=0 ){
- continue;
- }
- }
- }
- if( 0==(cntTab++) ){
- pExpr->iTable = pItem->iCursor;
- pExpr->iDb = pTab->iDb;
- }
- for(j=0, pCol=pTab->aCol; j<pTab->nCol; j++, pCol++){
- if( sqliteStrICmp(pCol->zName, zCol)==0 ){
- cnt++;
- pExpr->iTable = pItem->iCursor;
- pExpr->iDb = pTab->iDb;
- /* Substitute the rowid (column -1) for the INTEGER PRIMARY KEY */
- pExpr->iColumn = j==pTab->iPKey ? -1 : j;
- pExpr->dataType = pCol->sortOrder & SQLITE_SO_TYPEMASK;
- break;
- }
- }
- }
-
- /* If we have not already resolved the name, then maybe
- ** it is a new.* or old.* trigger argument reference
- */
- if( zDb==0 && zTab!=0 && cnt==0 && pParse->trigStack!=0 ){
- TriggerStack *pTriggerStack = pParse->trigStack;
- Table *pTab = 0;
- if( pTriggerStack->newIdx != -1 && sqliteStrICmp("new", zTab) == 0 ){
- pExpr->iTable = pTriggerStack->newIdx;
- assert( pTriggerStack->pTab );
- pTab = pTriggerStack->pTab;
- }else if( pTriggerStack->oldIdx != -1 && sqliteStrICmp("old", zTab) == 0 ){
- pExpr->iTable = pTriggerStack->oldIdx;
- assert( pTriggerStack->pTab );
- pTab = pTriggerStack->pTab;
- }
-
- if( pTab ){
- int j;
- Column *pCol = pTab->aCol;
-
- pExpr->iDb = pTab->iDb;
- cntTab++;
- for(j=0; j < pTab->nCol; j++, pCol++) {
- if( sqliteStrICmp(pCol->zName, zCol)==0 ){
- cnt++;
- pExpr->iColumn = j==pTab->iPKey ? -1 : j;
- pExpr->dataType = pCol->sortOrder & SQLITE_SO_TYPEMASK;
- break;
- }
- }
- }
- }
-
- /*
- ** Perhaps the name is a reference to the ROWID
- */
- if( cnt==0 && cntTab==1 && sqliteIsRowid(zCol) ){
- cnt = 1;
- pExpr->iColumn = -1;
- pExpr->dataType = SQLITE_SO_NUM;
- }
-
- /*
- ** If the input is of the form Z (not Y.Z or X.Y.Z) then the name Z
- ** might refer to an result-set alias. This happens, for example, when
- ** we are resolving names in the WHERE clause of the following command:
- **
- ** SELECT a+b AS x FROM table WHERE x<10;
- **
- ** In cases like this, replace pExpr with a copy of the expression that
- ** forms the result set entry ("a+b" in the example) and return immediately.
- ** Note that the expression in the result set should have already been
- ** resolved by the time the WHERE clause is resolved.
- */
- if( cnt==0 && pEList!=0 ){
- for(j=0; j<pEList->nExpr; j++){
- char *zAs = pEList->a[j].zName;
- if( zAs!=0 && sqliteStrICmp(zAs, zCol)==0 ){
- assert( pExpr->pLeft==0 && pExpr->pRight==0 );
- pExpr->op = TK_AS;
- pExpr->iColumn = j;
- pExpr->pLeft = sqliteExprDup(pEList->a[j].pExpr);
- sqliteFree(zCol);
- assert( zTab==0 && zDb==0 );
- return 0;
- }
- }
- }
-
- /*
- ** If X and Y are NULL (in other words if only the column name Z is
- ** supplied) and the value of Z is enclosed in double-quotes, then
- ** Z is a string literal if it doesn't match any column names. In that
- ** case, we need to return right away and not make any changes to
- ** pExpr.
- */
- if( cnt==0 && zTab==0 && pColumnToken->z[0]=='"' ){
- sqliteFree(zCol);
- return 0;
- }
-
- /*
- ** cnt==0 means there was not match. cnt>1 means there were two or
- ** more matches. Either way, we have an error.
- */
- if( cnt!=1 ){
- char *z = 0;
- char *zErr;
- zErr = cnt==0 ? "no such column: %s" : "ambiguous column name: %s";
- if( zDb ){
- sqliteSetString(&z, zDb, ".", zTab, ".", zCol, 0);
- }else if( zTab ){
- sqliteSetString(&z, zTab, ".", zCol, 0);
- }else{
- z = sqliteStrDup(zCol);
- }
- sqliteErrorMsg(pParse, zErr, z);
- sqliteFree(z);
- }
-
- /* Clean up and return
- */
- sqliteFree(zDb);
- sqliteFree(zTab);
- sqliteFree(zCol);
- sqliteExprDelete(pExpr->pLeft);
- pExpr->pLeft = 0;
- sqliteExprDelete(pExpr->pRight);
- pExpr->pRight = 0;
- pExpr->op = TK_COLUMN;
- sqliteAuthRead(pParse, pExpr, pSrcList);
- return cnt!=1;
-}
-
-/*
-** This routine walks an expression tree and resolves references to
-** table columns. Nodes of the form ID.ID or ID resolve into an
-** index to the table in the table list and a column offset. The
-** Expr.opcode for such nodes is changed to TK_COLUMN. The Expr.iTable
-** value is changed to the index of the referenced table in pTabList
-** plus the "base" value. The base value will ultimately become the
-** VDBE cursor number for a cursor that is pointing into the referenced
-** table. The Expr.iColumn value is changed to the index of the column
-** of the referenced table. The Expr.iColumn value for the special
-** ROWID column is -1. Any INTEGER PRIMARY KEY column is tried as an
-** alias for ROWID.
-**
-** We also check for instances of the IN operator. IN comes in two
-** forms:
-**
-** expr IN (exprlist)
-** and
-** expr IN (SELECT ...)
-**
-** The first form is handled by creating a set holding the list
-** of allowed values. The second form causes the SELECT to generate
-** a temporary table.
-**
-** This routine also looks for scalar SELECTs that are part of an expression.
-** If it finds any, it generates code to write the value of that select
-** into a memory cell.
-**
-** Unknown columns or tables provoke an error. The function returns
-** the number of errors seen and leaves an error message on pParse->zErrMsg.
-*/
-int sqliteExprResolveIds(
- Parse *pParse, /* The parser context */
- SrcList *pSrcList, /* List of tables used to resolve column names */
- ExprList *pEList, /* List of expressions used to resolve "AS" */
- Expr *pExpr /* The expression to be analyzed. */
-){
- int i;
-
- if( pExpr==0 || pSrcList==0 ) return 0;
- for(i=0; i<pSrcList->nSrc; i++){
- assert( pSrcList->a[i].iCursor>=0 && pSrcList->a[i].iCursor<pParse->nTab );
- }
- switch( pExpr->op ){
- /* Double-quoted strings (ex: "abc") are used as identifiers if
- ** possible. Otherwise they remain as strings. Single-quoted
- ** strings (ex: 'abc') are always string literals.
- */
- case TK_STRING: {
- if( pExpr->token.z[0]=='\'' ) break;
- /* Fall thru into the TK_ID case if this is a double-quoted string */
- }
- /* A lone identifier is the name of a columnd.
- */
- case TK_ID: {
- if( lookupName(pParse, 0, 0, &pExpr->token, pSrcList, pEList, pExpr) ){
- return 1;
- }
- break;
- }
-
- /* A table name and column name: ID.ID
- ** Or a database, table and column: ID.ID.ID
- */
- case TK_DOT: {
- Token *pColumn;
- Token *pTable;
- Token *pDb;
- Expr *pRight;
-
- pRight = pExpr->pRight;
- if( pRight->op==TK_ID ){
- pDb = 0;
- pTable = &pExpr->pLeft->token;
- pColumn = &pRight->token;
- }else{
- assert( pRight->op==TK_DOT );
- pDb = &pExpr->pLeft->token;
- pTable = &pRight->pLeft->token;
- pColumn = &pRight->pRight->token;
- }
- if( lookupName(pParse, pDb, pTable, pColumn, pSrcList, 0, pExpr) ){
- return 1;
- }
- break;
- }
-
- case TK_IN: {
- Vdbe *v = sqliteGetVdbe(pParse);
- if( v==0 ) return 1;
- if( sqliteExprResolveIds(pParse, pSrcList, pEList, pExpr->pLeft) ){
- return 1;
- }
- if( pExpr->pSelect ){
- /* Case 1: expr IN (SELECT ...)
- **
- ** Generate code to write the results of the select into a temporary
- ** table. The cursor number of the temporary table has already
- ** been put in iTable by sqliteExprResolveInSelect().
- */
- pExpr->iTable = pParse->nTab++;
- sqliteVdbeAddOp(v, OP_OpenTemp, pExpr->iTable, 1);
- sqliteSelect(pParse, pExpr->pSelect, SRT_Set, pExpr->iTable, 0,0,0);
- }else if( pExpr->pList ){
- /* Case 2: expr IN (exprlist)
- **
- ** Create a set to put the exprlist values in. The Set id is stored
- ** in iTable.
- */
- int i, iSet;
- for(i=0; i<pExpr->pList->nExpr; i++){
- Expr *pE2 = pExpr->pList->a[i].pExpr;
- if( !sqliteExprIsConstant(pE2) ){
- sqliteErrorMsg(pParse,
- "right-hand side of IN operator must be constant");
- return 1;
- }
- if( sqliteExprCheck(pParse, pE2, 0, 0) ){
- return 1;
- }
- }
- iSet = pExpr->iTable = pParse->nSet++;
- for(i=0; i<pExpr->pList->nExpr; i++){
- Expr *pE2 = pExpr->pList->a[i].pExpr;
- switch( pE2->op ){
- case TK_FLOAT:
- case TK_INTEGER:
- case TK_STRING: {
- int addr;
- assert( pE2->token.z );
- addr = sqliteVdbeOp3(v, OP_SetInsert, iSet, 0,
- pE2->token.z, pE2->token.n);
- sqliteVdbeDequoteP3(v, addr);
- break;
- }
- default: {
- sqliteExprCode(pParse, pE2);
- sqliteVdbeAddOp(v, OP_SetInsert, iSet, 0);
- break;
- }
- }
- }
- }
- break;
- }
-
- case TK_SELECT: {
- /* This has to be a scalar SELECT. Generate code to put the
- ** value of this select in a memory cell and record the number
- ** of the memory cell in iColumn.
- */
- pExpr->iColumn = pParse->nMem++;
- if( sqliteSelect(pParse, pExpr->pSelect, SRT_Mem, pExpr->iColumn,0,0,0) ){
- return 1;
- }
- break;
- }
-
- /* For all else, just recursively walk the tree */
- default: {
- if( pExpr->pLeft
- && sqliteExprResolveIds(pParse, pSrcList, pEList, pExpr->pLeft) ){
- return 1;
- }
- if( pExpr->pRight
- && sqliteExprResolveIds(pParse, pSrcList, pEList, pExpr->pRight) ){
- return 1;
- }
- if( pExpr->pList ){
- int i;
- ExprList *pList = pExpr->pList;
- for(i=0; i<pList->nExpr; i++){
- Expr *pArg = pList->a[i].pExpr;
- if( sqliteExprResolveIds(pParse, pSrcList, pEList, pArg) ){
- return 1;
- }
- }
- }
- }
- }
- return 0;
-}
-
-/*
-** pExpr is a node that defines a function of some kind. It might
-** be a syntactic function like "count(x)" or it might be a function
-** that implements an operator, like "a LIKE b".
-**
-** This routine makes *pzName point to the name of the function and
-** *pnName hold the number of characters in the function name.
-*/
-static void getFunctionName(Expr *pExpr, const char **pzName, int *pnName){
- switch( pExpr->op ){
- case TK_FUNCTION: {
- *pzName = pExpr->token.z;
- *pnName = pExpr->token.n;
- break;
- }
- case TK_LIKE: {
- *pzName = "like";
- *pnName = 4;
- break;
- }
- case TK_GLOB: {
- *pzName = "glob";
- *pnName = 4;
- break;
- }
- default: {
- *pzName = "can't happen";
- *pnName = 12;
- break;
- }
- }
-}
-
-/*
-** Error check the functions in an expression. Make sure all
-** function names are recognized and all functions have the correct
-** number of arguments. Leave an error message in pParse->zErrMsg
-** if anything is amiss. Return the number of errors.
-**
-** if pIsAgg is not null and this expression is an aggregate function
-** (like count(*) or max(value)) then write a 1 into *pIsAgg.
-*/
-int sqliteExprCheck(Parse *pParse, Expr *pExpr, int allowAgg, int *pIsAgg){
- int nErr = 0;
- if( pExpr==0 ) return 0;
- switch( pExpr->op ){
- case TK_GLOB:
- case TK_LIKE:
- case TK_FUNCTION: {
- int n = pExpr->pList ? pExpr->pList->nExpr : 0; /* Number of arguments */
- int no_such_func = 0; /* True if no such function exists */
- int wrong_num_args = 0; /* True if wrong number of arguments */
- int is_agg = 0; /* True if is an aggregate function */
- int i;
- int nId; /* Number of characters in function name */
- const char *zId; /* The function name. */
- FuncDef *pDef;
-
- getFunctionName(pExpr, &zId, &nId);
- pDef = sqliteFindFunction(pParse->db, zId, nId, n, 0);
- if( pDef==0 ){
- pDef = sqliteFindFunction(pParse->db, zId, nId, -1, 0);
- if( pDef==0 ){
- no_such_func = 1;
- }else{
- wrong_num_args = 1;
- }
- }else{
- is_agg = pDef->xFunc==0;
- }
- if( is_agg && !allowAgg ){
- sqliteErrorMsg(pParse, "misuse of aggregate function %.*s()", nId, zId);
- nErr++;
- is_agg = 0;
- }else if( no_such_func ){
- sqliteErrorMsg(pParse, "no such function: %.*s", nId, zId);
- nErr++;
- }else if( wrong_num_args ){
- sqliteErrorMsg(pParse,"wrong number of arguments to function %.*s()",
- nId, zId);
- nErr++;
- }
- if( is_agg ){
- pExpr->op = TK_AGG_FUNCTION;
- if( pIsAgg ) *pIsAgg = 1;
- }
- for(i=0; nErr==0 && i<n; i++){
- nErr = sqliteExprCheck(pParse, pExpr->pList->a[i].pExpr,
- allowAgg && !is_agg, pIsAgg);
- }
- if( pDef==0 ){
- /* Already reported an error */
- }else if( pDef->dataType>=0 ){
- if( pDef->dataType<n ){
- pExpr->dataType =
- sqliteExprType(pExpr->pList->a[pDef->dataType].pExpr);
- }else{
- pExpr->dataType = SQLITE_SO_NUM;
- }
- }else if( pDef->dataType==SQLITE_ARGS ){
- pDef->dataType = SQLITE_SO_TEXT;
- for(i=0; i<n; i++){
- if( sqliteExprType(pExpr->pList->a[i].pExpr)==SQLITE_SO_NUM ){
- pExpr->dataType = SQLITE_SO_NUM;
- break;
- }
- }
- }else if( pDef->dataType==SQLITE_NUMERIC ){
- pExpr->dataType = SQLITE_SO_NUM;
- }else{
- pExpr->dataType = SQLITE_SO_TEXT;
- }
- }
- default: {
- if( pExpr->pLeft ){
- nErr = sqliteExprCheck(pParse, pExpr->pLeft, allowAgg, pIsAgg);
- }
- if( nErr==0 && pExpr->pRight ){
- nErr = sqliteExprCheck(pParse, pExpr->pRight, allowAgg, pIsAgg);
- }
- if( nErr==0 && pExpr->pList ){
- int n = pExpr->pList->nExpr;
- int i;
- for(i=0; nErr==0 && i<n; i++){
- Expr *pE2 = pExpr->pList->a[i].pExpr;
- nErr = sqliteExprCheck(pParse, pE2, allowAgg, pIsAgg);
- }
- }
- break;
- }
- }
- return nErr;
-}
-
-/*
-** Return either SQLITE_SO_NUM or SQLITE_SO_TEXT to indicate whether the
-** given expression should sort as numeric values or as text.
-**
-** The sqliteExprResolveIds() and sqliteExprCheck() routines must have
-** both been called on the expression before it is passed to this routine.
-*/
-int sqliteExprType(Expr *p){
- if( p==0 ) return SQLITE_SO_NUM;
- while( p ) switch( p->op ){
- case TK_PLUS:
- case TK_MINUS:
- case TK_STAR:
- case TK_SLASH:
- case TK_AND:
- case TK_OR:
- case TK_ISNULL:
- case TK_NOTNULL:
- case TK_NOT:
- case TK_UMINUS:
- case TK_UPLUS:
- case TK_BITAND:
- case TK_BITOR:
- case TK_BITNOT:
- case TK_LSHIFT:
- case TK_RSHIFT:
- case TK_REM:
- case TK_INTEGER:
- case TK_FLOAT:
- case TK_IN:
- case TK_BETWEEN:
- case TK_GLOB:
- case TK_LIKE:
- return SQLITE_SO_NUM;
-
- case TK_STRING:
- case TK_NULL:
- case TK_CONCAT:
- case TK_VARIABLE:
- return SQLITE_SO_TEXT;
-
- case TK_LT:
- case TK_LE:
- case TK_GT:
- case TK_GE:
- case TK_NE:
- case TK_EQ:
- if( sqliteExprType(p->pLeft)==SQLITE_SO_NUM ){
- return SQLITE_SO_NUM;
- }
- p = p->pRight;
- break;
-
- case TK_AS:
- p = p->pLeft;
- break;
-
- case TK_COLUMN:
- case TK_FUNCTION:
- case TK_AGG_FUNCTION:
- return p->dataType;
-
- case TK_SELECT:
- assert( p->pSelect );
- assert( p->pSelect->pEList );
- assert( p->pSelect->pEList->nExpr>0 );
- p = p->pSelect->pEList->a[0].pExpr;
- break;
-
- case TK_CASE: {
- if( p->pRight && sqliteExprType(p->pRight)==SQLITE_SO_NUM ){
- return SQLITE_SO_NUM;
- }
- if( p->pList ){
- int i;
- ExprList *pList = p->pList;
- for(i=1; i<pList->nExpr; i+=2){
- if( sqliteExprType(pList->a[i].pExpr)==SQLITE_SO_NUM ){
- return SQLITE_SO_NUM;
- }
- }
- }
- return SQLITE_SO_TEXT;
- }
-
- default:
- assert( p->op==TK_ABORT ); /* Can't Happen */
- break;
- }
- return SQLITE_SO_NUM;
-}
-
-/*
-** Generate code into the current Vdbe to evaluate the given
-** expression and leave the result on the top of stack.
-*/
-void sqliteExprCode(Parse *pParse, Expr *pExpr){
- Vdbe *v = pParse->pVdbe;
- int op;
- if( v==0 || pExpr==0 ) return;
- switch( pExpr->op ){
- case TK_PLUS: op = OP_Add; break;
- case TK_MINUS: op = OP_Subtract; break;
- case TK_STAR: op = OP_Multiply; break;
- case TK_SLASH: op = OP_Divide; break;
- case TK_AND: op = OP_And; break;
- case TK_OR: op = OP_Or; break;
- case TK_LT: op = OP_Lt; break;
- case TK_LE: op = OP_Le; break;
- case TK_GT: op = OP_Gt; break;
- case TK_GE: op = OP_Ge; break;
- case TK_NE: op = OP_Ne; break;
- case TK_EQ: op = OP_Eq; break;
- case TK_ISNULL: op = OP_IsNull; break;
- case TK_NOTNULL: op = OP_NotNull; break;
- case TK_NOT: op = OP_Not; break;
- case TK_UMINUS: op = OP_Negative; break;
- case TK_BITAND: op = OP_BitAnd; break;
- case TK_BITOR: op = OP_BitOr; break;
- case TK_BITNOT: op = OP_BitNot; break;
- case TK_LSHIFT: op = OP_ShiftLeft; break;
- case TK_RSHIFT: op = OP_ShiftRight; break;
- case TK_REM: op = OP_Remainder; break;
- default: break;
- }
- switch( pExpr->op ){
- case TK_COLUMN: {
- if( pParse->useAgg ){
- sqliteVdbeAddOp(v, OP_AggGet, 0, pExpr->iAgg);
- }else if( pExpr->iColumn>=0 ){
- sqliteVdbeAddOp(v, OP_Column, pExpr->iTable, pExpr->iColumn);
- }else{
- sqliteVdbeAddOp(v, OP_Recno, pExpr->iTable, 0);
- }
- break;
- }
- case TK_STRING:
- case TK_FLOAT:
- case TK_INTEGER: {
- if( pExpr->op==TK_INTEGER && sqliteFitsIn32Bits(pExpr->token.z) ){
- sqliteVdbeAddOp(v, OP_Integer, atoi(pExpr->token.z), 0);
- }else{
- sqliteVdbeAddOp(v, OP_String, 0, 0);
- }
- assert( pExpr->token.z );
- sqliteVdbeChangeP3(v, -1, pExpr->token.z, pExpr->token.n);
- sqliteVdbeDequoteP3(v, -1);
- break;
- }
- case TK_NULL: {
- sqliteVdbeAddOp(v, OP_String, 0, 0);
- break;
- }
- case TK_VARIABLE: {
- sqliteVdbeAddOp(v, OP_Variable, pExpr->iTable, 0);
- break;
- }
- case TK_LT:
- case TK_LE:
- case TK_GT:
- case TK_GE:
- case TK_NE:
- case TK_EQ: {
- if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
- op += 6; /* Convert numeric opcodes to text opcodes */
- }
- /* Fall through into the next case */
- }
- case TK_AND:
- case TK_OR:
- case TK_PLUS:
- case TK_STAR:
- case TK_MINUS:
- case TK_REM:
- case TK_BITAND:
- case TK_BITOR:
- case TK_SLASH: {
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteExprCode(pParse, pExpr->pRight);
- sqliteVdbeAddOp(v, op, 0, 0);
- break;
- }
- case TK_LSHIFT:
- case TK_RSHIFT: {
- sqliteExprCode(pParse, pExpr->pRight);
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteVdbeAddOp(v, op, 0, 0);
- break;
- }
- case TK_CONCAT: {
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteExprCode(pParse, pExpr->pRight);
- sqliteVdbeAddOp(v, OP_Concat, 2, 0);
- break;
- }
- case TK_UMINUS: {
- assert( pExpr->pLeft );
- if( pExpr->pLeft->op==TK_FLOAT || pExpr->pLeft->op==TK_INTEGER ){
- Token *p = &pExpr->pLeft->token;
- char *z = sqliteMalloc( p->n + 2 );
- sprintf(z, "-%.*s", p->n, p->z);
- if( pExpr->pLeft->op==TK_INTEGER && sqliteFitsIn32Bits(z) ){
- sqliteVdbeAddOp(v, OP_Integer, atoi(z), 0);
- }else{
- sqliteVdbeAddOp(v, OP_String, 0, 0);
- }
- sqliteVdbeChangeP3(v, -1, z, p->n+1);
- sqliteFree(z);
- break;
- }
- /* Fall through into TK_NOT */
- }
- case TK_BITNOT:
- case TK_NOT: {
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteVdbeAddOp(v, op, 0, 0);
- break;
- }
- case TK_ISNULL:
- case TK_NOTNULL: {
- int dest;
- sqliteVdbeAddOp(v, OP_Integer, 1, 0);
- sqliteExprCode(pParse, pExpr->pLeft);
- dest = sqliteVdbeCurrentAddr(v) + 2;
- sqliteVdbeAddOp(v, op, 1, dest);
- sqliteVdbeAddOp(v, OP_AddImm, -1, 0);
- break;
- }
- case TK_AGG_FUNCTION: {
- sqliteVdbeAddOp(v, OP_AggGet, 0, pExpr->iAgg);
- break;
- }
- case TK_GLOB:
- case TK_LIKE:
- case TK_FUNCTION: {
- ExprList *pList = pExpr->pList;
- int nExpr = pList ? pList->nExpr : 0;
- FuncDef *pDef;
- int nId;
- const char *zId;
- getFunctionName(pExpr, &zId, &nId);
- pDef = sqliteFindFunction(pParse->db, zId, nId, nExpr, 0);
- assert( pDef!=0 );
- nExpr = sqliteExprCodeExprList(pParse, pList, pDef->includeTypes);
- sqliteVdbeOp3(v, OP_Function, nExpr, 0, (char*)pDef, P3_POINTER);
- break;
- }
- case TK_SELECT: {
- sqliteVdbeAddOp(v, OP_MemLoad, pExpr->iColumn, 0);
- break;
- }
- case TK_IN: {
- int addr;
- sqliteVdbeAddOp(v, OP_Integer, 1, 0);
- sqliteExprCode(pParse, pExpr->pLeft);
- addr = sqliteVdbeCurrentAddr(v);
- sqliteVdbeAddOp(v, OP_NotNull, -1, addr+4);
- sqliteVdbeAddOp(v, OP_Pop, 2, 0);
- sqliteVdbeAddOp(v, OP_String, 0, 0);
- sqliteVdbeAddOp(v, OP_Goto, 0, addr+6);
- if( pExpr->pSelect ){
- sqliteVdbeAddOp(v, OP_Found, pExpr->iTable, addr+6);
- }else{
- sqliteVdbeAddOp(v, OP_SetFound, pExpr->iTable, addr+6);
- }
- sqliteVdbeAddOp(v, OP_AddImm, -1, 0);
- break;
- }
- case TK_BETWEEN: {
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteVdbeAddOp(v, OP_Dup, 0, 0);
- sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
- sqliteVdbeAddOp(v, OP_Ge, 0, 0);
- sqliteVdbeAddOp(v, OP_Pull, 1, 0);
- sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
- sqliteVdbeAddOp(v, OP_Le, 0, 0);
- sqliteVdbeAddOp(v, OP_And, 0, 0);
- break;
- }
- case TK_UPLUS:
- case TK_AS: {
- sqliteExprCode(pParse, pExpr->pLeft);
- break;
- }
- case TK_CASE: {
- int expr_end_label;
- int jumpInst;
- int addr;
- int nExpr;
- int i;
-
- assert(pExpr->pList);
- assert((pExpr->pList->nExpr % 2) == 0);
- assert(pExpr->pList->nExpr > 0);
- nExpr = pExpr->pList->nExpr;
- expr_end_label = sqliteVdbeMakeLabel(v);
- if( pExpr->pLeft ){
- sqliteExprCode(pParse, pExpr->pLeft);
- }
- for(i=0; i<nExpr; i=i+2){
- sqliteExprCode(pParse, pExpr->pList->a[i].pExpr);
- if( pExpr->pLeft ){
- sqliteVdbeAddOp(v, OP_Dup, 1, 1);
- jumpInst = sqliteVdbeAddOp(v, OP_Ne, 1, 0);
- sqliteVdbeAddOp(v, OP_Pop, 1, 0);
- }else{
- jumpInst = sqliteVdbeAddOp(v, OP_IfNot, 1, 0);
- }
- sqliteExprCode(pParse, pExpr->pList->a[i+1].pExpr);
- sqliteVdbeAddOp(v, OP_Goto, 0, expr_end_label);
- addr = sqliteVdbeCurrentAddr(v);
- sqliteVdbeChangeP2(v, jumpInst, addr);
- }
- if( pExpr->pLeft ){
- sqliteVdbeAddOp(v, OP_Pop, 1, 0);
- }
- if( pExpr->pRight ){
- sqliteExprCode(pParse, pExpr->pRight);
- }else{
- sqliteVdbeAddOp(v, OP_String, 0, 0);
- }
- sqliteVdbeResolveLabel(v, expr_end_label);
- break;
- }
- case TK_RAISE: {
- if( !pParse->trigStack ){
- sqliteErrorMsg(pParse,
- "RAISE() may only be used within a trigger-program");
- pParse->nErr++;
- return;
- }
- if( pExpr->iColumn == OE_Rollback ||
- pExpr->iColumn == OE_Abort ||
- pExpr->iColumn == OE_Fail ){
- sqliteVdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, pExpr->iColumn,
- pExpr->token.z, pExpr->token.n);
- sqliteVdbeDequoteP3(v, -1);
- } else {
- assert( pExpr->iColumn == OE_Ignore );
- sqliteVdbeOp3(v, OP_Goto, 0, pParse->trigStack->ignoreJump,
- "(IGNORE jump)", 0);
- }
- }
- break;
- }
-}
-
-/*
-** Generate code that pushes the value of every element of the given
-** expression list onto the stack. If the includeTypes flag is true,
-** then also push a string that is the datatype of each element onto
-** the stack after the value.
-**
-** Return the number of elements pushed onto the stack.
-*/
-int sqliteExprCodeExprList(
- Parse *pParse, /* Parsing context */
- ExprList *pList, /* The expression list to be coded */
- int includeTypes /* TRUE to put datatypes on the stack too */
-){
- struct ExprList_item *pItem;
- int i, n;
- Vdbe *v;
- if( pList==0 ) return 0;
- v = sqliteGetVdbe(pParse);
- n = pList->nExpr;
- for(pItem=pList->a, i=0; i<n; i++, pItem++){
- sqliteExprCode(pParse, pItem->pExpr);
- if( includeTypes ){
- sqliteVdbeOp3(v, OP_String, 0, 0,
- sqliteExprType(pItem->pExpr)==SQLITE_SO_NUM ? "numeric" : "text",
- P3_STATIC);
- }
- }
- return includeTypes ? n*2 : n;
-}
-
-/*
-** Generate code for a boolean expression such that a jump is made
-** to the label "dest" if the expression is true but execution
-** continues straight thru if the expression is false.
-**
-** If the expression evaluates to NULL (neither true nor false), then
-** take the jump if the jumpIfNull flag is true.
-*/
-void sqliteExprIfTrue(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
- Vdbe *v = pParse->pVdbe;
- int op = 0;
- if( v==0 || pExpr==0 ) return;
- switch( pExpr->op ){
- case TK_LT: op = OP_Lt; break;
- case TK_LE: op = OP_Le; break;
- case TK_GT: op = OP_Gt; break;
- case TK_GE: op = OP_Ge; break;
- case TK_NE: op = OP_Ne; break;
- case TK_EQ: op = OP_Eq; break;
- case TK_ISNULL: op = OP_IsNull; break;
- case TK_NOTNULL: op = OP_NotNull; break;
- default: break;
- }
- switch( pExpr->op ){
- case TK_AND: {
- int d2 = sqliteVdbeMakeLabel(v);
- sqliteExprIfFalse(pParse, pExpr->pLeft, d2, !jumpIfNull);
- sqliteExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
- sqliteVdbeResolveLabel(v, d2);
- break;
- }
- case TK_OR: {
- sqliteExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
- sqliteExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
- break;
- }
- case TK_NOT: {
- sqliteExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
- break;
- }
- case TK_LT:
- case TK_LE:
- case TK_GT:
- case TK_GE:
- case TK_NE:
- case TK_EQ: {
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteExprCode(pParse, pExpr->pRight);
- if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
- op += 6; /* Convert numeric opcodes to text opcodes */
- }
- sqliteVdbeAddOp(v, op, jumpIfNull, dest);
- break;
- }
- case TK_ISNULL:
- case TK_NOTNULL: {
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteVdbeAddOp(v, op, 1, dest);
- break;
- }
- case TK_IN: {
- int addr;
- sqliteExprCode(pParse, pExpr->pLeft);
- addr = sqliteVdbeCurrentAddr(v);
- sqliteVdbeAddOp(v, OP_NotNull, -1, addr+3);
- sqliteVdbeAddOp(v, OP_Pop, 1, 0);
- sqliteVdbeAddOp(v, OP_Goto, 0, jumpIfNull ? dest : addr+4);
- if( pExpr->pSelect ){
- sqliteVdbeAddOp(v, OP_Found, pExpr->iTable, dest);
- }else{
- sqliteVdbeAddOp(v, OP_SetFound, pExpr->iTable, dest);
- }
- break;
- }
- case TK_BETWEEN: {
- int addr;
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteVdbeAddOp(v, OP_Dup, 0, 0);
- sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
- addr = sqliteVdbeAddOp(v, OP_Lt, !jumpIfNull, 0);
- sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
- sqliteVdbeAddOp(v, OP_Le, jumpIfNull, dest);
- sqliteVdbeAddOp(v, OP_Integer, 0, 0);
- sqliteVdbeChangeP2(v, addr, sqliteVdbeCurrentAddr(v));
- sqliteVdbeAddOp(v, OP_Pop, 1, 0);
- break;
- }
- default: {
- sqliteExprCode(pParse, pExpr);
- sqliteVdbeAddOp(v, OP_If, jumpIfNull, dest);
- break;
- }
- }
-}
-
-/*
-** Generate code for a boolean expression such that a jump is made
-** to the label "dest" if the expression is false but execution
-** continues straight thru if the expression is true.
-**
-** If the expression evaluates to NULL (neither true nor false) then
-** jump if jumpIfNull is true or fall through if jumpIfNull is false.
-*/
-void sqliteExprIfFalse(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
- Vdbe *v = pParse->pVdbe;
- int op = 0;
- if( v==0 || pExpr==0 ) return;
- switch( pExpr->op ){
- case TK_LT: op = OP_Ge; break;
- case TK_LE: op = OP_Gt; break;
- case TK_GT: op = OP_Le; break;
- case TK_GE: op = OP_Lt; break;
- case TK_NE: op = OP_Eq; break;
- case TK_EQ: op = OP_Ne; break;
- case TK_ISNULL: op = OP_NotNull; break;
- case TK_NOTNULL: op = OP_IsNull; break;
- default: break;
- }
- switch( pExpr->op ){
- case TK_AND: {
- sqliteExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
- sqliteExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
- break;
- }
- case TK_OR: {
- int d2 = sqliteVdbeMakeLabel(v);
- sqliteExprIfTrue(pParse, pExpr->pLeft, d2, !jumpIfNull);
- sqliteExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
- sqliteVdbeResolveLabel(v, d2);
- break;
- }
- case TK_NOT: {
- sqliteExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
- break;
- }
- case TK_LT:
- case TK_LE:
- case TK_GT:
- case TK_GE:
- case TK_NE:
- case TK_EQ: {
- if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
- /* Convert numeric comparison opcodes into text comparison opcodes.
- ** This step depends on the fact that the text comparision opcodes are
- ** always 6 greater than their corresponding numeric comparison
- ** opcodes.
- */
- assert( OP_Eq+6 == OP_StrEq );
- op += 6;
- }
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteExprCode(pParse, pExpr->pRight);
- sqliteVdbeAddOp(v, op, jumpIfNull, dest);
- break;
- }
- case TK_ISNULL:
- case TK_NOTNULL: {
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteVdbeAddOp(v, op, 1, dest);
- break;
- }
- case TK_IN: {
- int addr;
- sqliteExprCode(pParse, pExpr->pLeft);
- addr = sqliteVdbeCurrentAddr(v);
- sqliteVdbeAddOp(v, OP_NotNull, -1, addr+3);
- sqliteVdbeAddOp(v, OP_Pop, 1, 0);
- sqliteVdbeAddOp(v, OP_Goto, 0, jumpIfNull ? dest : addr+4);
- if( pExpr->pSelect ){
- sqliteVdbeAddOp(v, OP_NotFound, pExpr->iTable, dest);
- }else{
- sqliteVdbeAddOp(v, OP_SetNotFound, pExpr->iTable, dest);
- }
- break;
- }
- case TK_BETWEEN: {
- int addr;
- sqliteExprCode(pParse, pExpr->pLeft);
- sqliteVdbeAddOp(v, OP_Dup, 0, 0);
- sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
- addr = sqliteVdbeCurrentAddr(v);
- sqliteVdbeAddOp(v, OP_Ge, !jumpIfNull, addr+3);
- sqliteVdbeAddOp(v, OP_Pop, 1, 0);
- sqliteVdbeAddOp(v, OP_Goto, 0, dest);
- sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
- sqliteVdbeAddOp(v, OP_Gt, jumpIfNull, dest);
- break;
- }
- default: {
- sqliteExprCode(pParse, pExpr);
- sqliteVdbeAddOp(v, OP_IfNot, jumpIfNull, dest);
- break;
- }
- }
-}
-
-/*
-** Do a deep comparison of two expression trees. Return TRUE (non-zero)
-** if they are identical and return FALSE if they differ in any way.
-*/
-int sqliteExprCompare(Expr *pA, Expr *pB){
- int i;
- if( pA==0 ){
- return pB==0;
- }else if( pB==0 ){
- return 0;
- }
- if( pA->op!=pB->op ) return 0;
- if( !sqliteExprCompare(pA->pLeft, pB->pLeft) ) return 0;
- if( !sqliteExprCompare(pA->pRight, pB->pRight) ) return 0;
- if( pA->pList ){
- if( pB->pList==0 ) return 0;
- if( pA->pList->nExpr!=pB->pList->nExpr ) return 0;
- for(i=0; i<pA->pList->nExpr; i++){
- if( !sqliteExprCompare(pA->pList->a[i].pExpr, pB->pList->a[i].pExpr) ){
- return 0;
- }
- }
- }else if( pB->pList ){
- return 0;
- }
- if( pA->pSelect || pB->pSelect ) return 0;
- if( pA->iTable!=pB->iTable || pA->iColumn!=pB->iColumn ) return 0;
- if( pA->token.z ){
- if( pB->token.z==0 ) return 0;
- if( pB->token.n!=pA->token.n ) return 0;
- if( sqliteStrNICmp(pA->token.z, pB->token.z, pB->token.n)!=0 ) return 0;
- }
- return 1;
-}
-
-/*
-** Add a new element to the pParse->aAgg[] array and return its index.
-*/
-static int appendAggInfo(Parse *pParse){
- if( (pParse->nAgg & 0x7)==0 ){
- int amt = pParse->nAgg + 8;
- AggExpr *aAgg = sqliteRealloc(pParse->aAgg, amt*sizeof(pParse->aAgg[0]));
- if( aAgg==0 ){
- return -1;
- }
- pParse->aAgg = aAgg;
- }
- memset(&pParse->aAgg[pParse->nAgg], 0, sizeof(pParse->aAgg[0]));
- return pParse->nAgg++;
-}
-
-/*
-** Analyze the given expression looking for aggregate functions and
-** for variables that need to be added to the pParse->aAgg[] array.
-** Make additional entries to the pParse->aAgg[] array as necessary.
-**
-** This routine should only be called after the expression has been
-** analyzed by sqliteExprResolveIds() and sqliteExprCheck().
-**
-** If errors are seen, leave an error message in zErrMsg and return
-** the number of errors.
-*/
-int sqliteExprAnalyzeAggregates(Parse *pParse, Expr *pExpr){
- int i;
- AggExpr *aAgg;
- int nErr = 0;
-
- if( pExpr==0 ) return 0;
- switch( pExpr->op ){
- case TK_COLUMN: {
- aAgg = pParse->aAgg;
- for(i=0; i<pParse->nAgg; i++){
- if( aAgg[i].isAgg ) continue;
- if( aAgg[i].pExpr->iTable==pExpr->iTable
- && aAgg[i].pExpr->iColumn==pExpr->iColumn ){
- break;
- }
- }
- if( i>=pParse->nAgg ){
- i = appendAggInfo(pParse);
- if( i<0 ) return 1;
- pParse->aAgg[i].isAgg = 0;
- pParse->aAgg[i].pExpr = pExpr;
- }
- pExpr->iAgg = i;
- break;
- }
- case TK_AGG_FUNCTION: {
- aAgg = pParse->aAgg;
- for(i=0; i<pParse->nAgg; i++){
- if( !aAgg[i].isAgg ) continue;
- if( sqliteExprCompare(aAgg[i].pExpr, pExpr) ){
- break;
- }
- }
- if( i>=pParse->nAgg ){
- i = appendAggInfo(pParse);
- if( i<0 ) return 1;
- pParse->aAgg[i].isAgg = 1;
- pParse->aAgg[i].pExpr = pExpr;
- pParse->aAgg[i].pFunc = sqliteFindFunction(pParse->db,
- pExpr->token.z, pExpr->token.n,
- pExpr->pList ? pExpr->pList->nExpr : 0, 0);
- }
- pExpr->iAgg = i;
- break;
- }
- default: {
- if( pExpr->pLeft ){
- nErr = sqliteExprAnalyzeAggregates(pParse, pExpr->pLeft);
- }
- if( nErr==0 && pExpr->pRight ){
- nErr = sqliteExprAnalyzeAggregates(pParse, pExpr->pRight);
- }
- if( nErr==0 && pExpr->pList ){
- int n = pExpr->pList->nExpr;
- int i;
- for(i=0; nErr==0 && i<n; i++){
- nErr = sqliteExprAnalyzeAggregates(pParse, pExpr->pList->a[i].pExpr);
- }
- }
- break;
- }
- }
- return nErr;
-}
-
-/*
-** Locate a user function given a name and a number of arguments.
-** Return a pointer to the FuncDef structure that defines that
-** function, or return NULL if the function does not exist.
-**
-** If the createFlag argument is true, then a new (blank) FuncDef
-** structure is created and liked into the "db" structure if a
-** no matching function previously existed. When createFlag is true
-** and the nArg parameter is -1, then only a function that accepts
-** any number of arguments will be returned.
-**
-** If createFlag is false and nArg is -1, then the first valid
-** function found is returned. A function is valid if either xFunc
-** or xStep is non-zero.
-*/
-FuncDef *sqliteFindFunction(
- sqlite *db, /* An open database */
- const char *zName, /* Name of the function. Not null-terminated */
- int nName, /* Number of characters in the name */
- int nArg, /* Number of arguments. -1 means any number */
- int createFlag /* Create new entry if true and does not otherwise exist */
-){
- FuncDef *pFirst, *p, *pMaybe;
- pFirst = p = (FuncDef*)sqliteHashFind(&db->aFunc, zName, nName);
- if( p && !createFlag && nArg<0 ){
- while( p && p->xFunc==0 && p->xStep==0 ){ p = p->pNext; }
- return p;
- }
- pMaybe = 0;
- while( p && p->nArg!=nArg ){
- if( p->nArg<0 && !createFlag && (p->xFunc || p->xStep) ) pMaybe = p;
- p = p->pNext;
- }
- if( p && !createFlag && p->xFunc==0 && p->xStep==0 ){
- return 0;
- }
- if( p==0 && pMaybe ){
- assert( createFlag==0 );
- return pMaybe;
- }
- if( p==0 && createFlag && (p = sqliteMalloc(sizeof(*p)))!=0 ){
- p->nArg = nArg;
- p->pNext = pFirst;
- p->dataType = pFirst ? pFirst->dataType : SQLITE_NUMERIC;
- sqliteHashInsert(&db->aFunc, zName, nName, (void*)p);
- }
- return p;
-}
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