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-rw-r--r--digikam/libs/sqlite2/expr.c1662
1 files changed, 1662 insertions, 0 deletions
diff --git a/digikam/libs/sqlite2/expr.c b/digikam/libs/sqlite2/expr.c
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+++ b/digikam/libs/sqlite2/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: expr.c 875429 2008-10-24 12:20:41Z cgilles $
+*/
+#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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 05:54:34 +0000