in sqlite/sqlite3_debug.c [104062:104798]
SQLITE_PRIVATE int sqlite3ExprCodeTarget(Parse *pParse, Expr *pExpr, int target){
Vdbe *v = pParse->pVdbe; /* The VM under construction */
int op; /* The opcode being coded */
int inReg = target; /* Results stored in register inReg */
int regFree1 = 0; /* If non-zero free this temporary register */
int regFree2 = 0; /* If non-zero free this temporary register */
int r1, r2; /* Various register numbers */
Expr tempX; /* Temporary expression node */
int p5 = 0;
assert( target>0 && target<=pParse->nMem );
assert( v!=0 );
expr_code_doover:
if( pExpr==0 ){
op = TK_NULL;
}else{
assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
op = pExpr->op;
}
switch( op ){
case TK_AGG_COLUMN: {
AggInfo *pAggInfo = pExpr->pAggInfo;
struct AggInfo_col *pCol;
assert( pAggInfo!=0 );
assert( pExpr->iAgg>=0 && pExpr->iAgg<pAggInfo->nColumn );
pCol = &pAggInfo->aCol[pExpr->iAgg];
if( !pAggInfo->directMode ){
assert( pCol->iMem>0 );
return pCol->iMem;
}else if( pAggInfo->useSortingIdx ){
Table *pTab = pCol->pTab;
sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdxPTab,
pCol->iSorterColumn, target);
if( pCol->iColumn<0 ){
VdbeComment((v,"%s.rowid",pTab->zName));
}else{
VdbeComment((v,"%s.%s",pTab->zName,pTab->aCol[pCol->iColumn].zName));
if( pTab->aCol[pCol->iColumn].affinity==SQLITE_AFF_REAL ){
sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
}
}
return target;
}
/* Otherwise, fall thru into the TK_COLUMN case */
/* no break */ deliberate_fall_through
}
case TK_COLUMN: {
int iTab = pExpr->iTable;
int iReg;
if( ExprHasProperty(pExpr, EP_FixedCol) ){
/* This COLUMN expression is really a constant due to WHERE clause
** constraints, and that constant is coded by the pExpr->pLeft
** expresssion. However, make sure the constant has the correct
** datatype by applying the Affinity of the table column to the
** constant.
*/
int aff;
iReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft,target);
if( pExpr->y.pTab ){
aff = sqlite3TableColumnAffinity(pExpr->y.pTab, pExpr->iColumn);
}else{
aff = pExpr->affExpr;
}
if( aff>SQLITE_AFF_BLOB ){
static const char zAff[] = "B\000C\000D\000E";
assert( SQLITE_AFF_BLOB=='A' );
assert( SQLITE_AFF_TEXT=='B' );
sqlite3VdbeAddOp4(v, OP_Affinity, iReg, 1, 0,
&zAff[(aff-'B')*2], P4_STATIC);
}
return iReg;
}
if( iTab<0 ){
if( pParse->iSelfTab<0 ){
/* Other columns in the same row for CHECK constraints or
** generated columns or for inserting into partial index.
** The row is unpacked into registers beginning at
** 0-(pParse->iSelfTab). The rowid (if any) is in a register
** immediately prior to the first column.
*/
Column *pCol;
Table *pTab = pExpr->y.pTab;
int iSrc;
int iCol = pExpr->iColumn;
assert( pTab!=0 );
assert( iCol>=XN_ROWID );
assert( iCol<pTab->nCol );
if( iCol<0 ){
return -1-pParse->iSelfTab;
}
pCol = pTab->aCol + iCol;
testcase( iCol!=sqlite3TableColumnToStorage(pTab,iCol) );
iSrc = sqlite3TableColumnToStorage(pTab, iCol) - pParse->iSelfTab;
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
if( pCol->colFlags & COLFLAG_GENERATED ){
if( pCol->colFlags & COLFLAG_BUSY ){
sqlite3ErrorMsg(pParse, "generated column loop on \"%s\"",
pCol->zName);
return 0;
}
pCol->colFlags |= COLFLAG_BUSY;
if( pCol->colFlags & COLFLAG_NOTAVAIL ){
sqlite3ExprCodeGeneratedColumn(pParse, pCol, iSrc);
}
pCol->colFlags &= ~(COLFLAG_BUSY|COLFLAG_NOTAVAIL);
return iSrc;
}else
#endif /* SQLITE_OMIT_GENERATED_COLUMNS */
if( pCol->affinity==SQLITE_AFF_REAL ){
sqlite3VdbeAddOp2(v, OP_SCopy, iSrc, target);
sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
return target;
}else{
return iSrc;
}
}else{
/* Coding an expression that is part of an index where column names
** in the index refer to the table to which the index belongs */
iTab = pParse->iSelfTab - 1;
}
}
iReg = sqlite3ExprCodeGetColumn(pParse, pExpr->y.pTab,
pExpr->iColumn, iTab, target,
pExpr->op2);
if( pExpr->y.pTab==0 && pExpr->affExpr==SQLITE_AFF_REAL ){
sqlite3VdbeAddOp1(v, OP_RealAffinity, iReg);
}
return iReg;
}
case TK_INTEGER: {
codeInteger(pParse, pExpr, 0, target);
return target;
}
case TK_TRUEFALSE: {
sqlite3VdbeAddOp2(v, OP_Integer, sqlite3ExprTruthValue(pExpr), target);
return target;
}
#ifndef SQLITE_OMIT_FLOATING_POINT
case TK_FLOAT: {
assert( !ExprHasProperty(pExpr, EP_IntValue) );
codeReal(v, pExpr->u.zToken, 0, target);
return target;
}
#endif
case TK_STRING: {
assert( !ExprHasProperty(pExpr, EP_IntValue) );
sqlite3VdbeLoadString(v, target, pExpr->u.zToken);
return target;
}
default: {
/* Make NULL the default case so that if a bug causes an illegal
** Expr node to be passed into this function, it will be handled
** sanely and not crash. But keep the assert() to bring the problem
** to the attention of the developers. */
assert( op==TK_NULL );
sqlite3VdbeAddOp2(v, OP_Null, 0, target);
return target;
}
#ifndef SQLITE_OMIT_BLOB_LITERAL
case TK_BLOB: {
int n;
const char *z;
char *zBlob;
assert( !ExprHasProperty(pExpr, EP_IntValue) );
assert( pExpr->u.zToken[0]=='x' || pExpr->u.zToken[0]=='X' );
assert( pExpr->u.zToken[1]=='\'' );
z = &pExpr->u.zToken[2];
n = sqlite3Strlen30(z) - 1;
assert( z[n]=='\'' );
zBlob = sqlite3HexToBlob(sqlite3VdbeDb(v), z, n);
sqlite3VdbeAddOp4(v, OP_Blob, n/2, target, 0, zBlob, P4_DYNAMIC);
return target;
}
#endif
case TK_VARIABLE: {
assert( !ExprHasProperty(pExpr, EP_IntValue) );
assert( pExpr->u.zToken!=0 );
assert( pExpr->u.zToken[0]!=0 );
sqlite3VdbeAddOp2(v, OP_Variable, pExpr->iColumn, target);
if( pExpr->u.zToken[1]!=0 ){
const char *z = sqlite3VListNumToName(pParse->pVList, pExpr->iColumn);
assert( pExpr->u.zToken[0]=='?' || (z && !strcmp(pExpr->u.zToken, z)) );
pParse->pVList[0] = 0; /* Indicate VList may no longer be enlarged */
sqlite3VdbeAppendP4(v, (char*)z, P4_STATIC);
}
return target;
}
case TK_REGISTER: {
return pExpr->iTable;
}
#ifndef SQLITE_OMIT_CAST
case TK_CAST: {
/* Expressions of the form: CAST(pLeft AS token) */
inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
if( inReg!=target ){
sqlite3VdbeAddOp2(v, OP_SCopy, inReg, target);
inReg = target;
}
sqlite3VdbeAddOp2(v, OP_Cast, target,
sqlite3AffinityType(pExpr->u.zToken, 0));
return inReg;
}
#endif /* SQLITE_OMIT_CAST */
case TK_IS:
case TK_ISNOT:
op = (op==TK_IS) ? TK_EQ : TK_NE;
p5 = SQLITE_NULLEQ;
/* fall-through */
case TK_LT:
case TK_LE:
case TK_GT:
case TK_GE:
case TK_NE:
case TK_EQ: {
Expr *pLeft = pExpr->pLeft;
if( sqlite3ExprIsVector(pLeft) ){
codeVectorCompare(pParse, pExpr, target, op, p5);
}else{
r1 = sqlite3ExprCodeTemp(pParse, pLeft, ®Free1);
r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, ®Free2);
codeCompare(pParse, pLeft, pExpr->pRight, op,
r1, r2, inReg, SQLITE_STOREP2 | p5,
ExprHasProperty(pExpr,EP_Commuted));
assert(TK_LT==OP_Lt); testcase(op==OP_Lt); VdbeCoverageIf(v,op==OP_Lt);
assert(TK_LE==OP_Le); testcase(op==OP_Le); VdbeCoverageIf(v,op==OP_Le);
assert(TK_GT==OP_Gt); testcase(op==OP_Gt); VdbeCoverageIf(v,op==OP_Gt);
assert(TK_GE==OP_Ge); testcase(op==OP_Ge); VdbeCoverageIf(v,op==OP_Ge);
assert(TK_EQ==OP_Eq); testcase(op==OP_Eq); VdbeCoverageIf(v,op==OP_Eq);
assert(TK_NE==OP_Ne); testcase(op==OP_Ne); VdbeCoverageIf(v,op==OP_Ne);
testcase( regFree1==0 );
testcase( regFree2==0 );
}
break;
}
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:
case TK_LSHIFT:
case TK_RSHIFT:
case TK_CONCAT: {
assert( TK_AND==OP_And ); testcase( op==TK_AND );
assert( TK_OR==OP_Or ); testcase( op==TK_OR );
assert( TK_PLUS==OP_Add ); testcase( op==TK_PLUS );
assert( TK_MINUS==OP_Subtract ); testcase( op==TK_MINUS );
assert( TK_REM==OP_Remainder ); testcase( op==TK_REM );
assert( TK_BITAND==OP_BitAnd ); testcase( op==TK_BITAND );
assert( TK_BITOR==OP_BitOr ); testcase( op==TK_BITOR );
assert( TK_SLASH==OP_Divide ); testcase( op==TK_SLASH );
assert( TK_LSHIFT==OP_ShiftLeft ); testcase( op==TK_LSHIFT );
assert( TK_RSHIFT==OP_ShiftRight ); testcase( op==TK_RSHIFT );
assert( TK_CONCAT==OP_Concat ); testcase( op==TK_CONCAT );
r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, ®Free1);
r2 = sqlite3ExprCodeTemp(pParse, pExpr->pRight, ®Free2);
sqlite3VdbeAddOp3(v, op, r2, r1, target);
testcase( regFree1==0 );
testcase( regFree2==0 );
break;
}
case TK_UMINUS: {
Expr *pLeft = pExpr->pLeft;
assert( pLeft );
if( pLeft->op==TK_INTEGER ){
codeInteger(pParse, pLeft, 1, target);
return target;
#ifndef SQLITE_OMIT_FLOATING_POINT
}else if( pLeft->op==TK_FLOAT ){
assert( !ExprHasProperty(pExpr, EP_IntValue) );
codeReal(v, pLeft->u.zToken, 1, target);
return target;
#endif
}else{
tempX.op = TK_INTEGER;
tempX.flags = EP_IntValue|EP_TokenOnly;
tempX.u.iValue = 0;
ExprClearVVAProperties(&tempX);
r1 = sqlite3ExprCodeTemp(pParse, &tempX, ®Free1);
r2 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, ®Free2);
sqlite3VdbeAddOp3(v, OP_Subtract, r2, r1, target);
testcase( regFree2==0 );
}
break;
}
case TK_BITNOT:
case TK_NOT: {
assert( TK_BITNOT==OP_BitNot ); testcase( op==TK_BITNOT );
assert( TK_NOT==OP_Not ); testcase( op==TK_NOT );
r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, ®Free1);
testcase( regFree1==0 );
sqlite3VdbeAddOp2(v, op, r1, inReg);
break;
}
case TK_TRUTH: {
int isTrue; /* IS TRUE or IS NOT TRUE */
int bNormal; /* IS TRUE or IS FALSE */
r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, ®Free1);
testcase( regFree1==0 );
isTrue = sqlite3ExprTruthValue(pExpr->pRight);
bNormal = pExpr->op2==TK_IS;
testcase( isTrue && bNormal);
testcase( !isTrue && bNormal);
sqlite3VdbeAddOp4Int(v, OP_IsTrue, r1, inReg, !isTrue, isTrue ^ bNormal);
break;
}
case TK_ISNULL:
case TK_NOTNULL: {
int addr;
assert( TK_ISNULL==OP_IsNull ); testcase( op==TK_ISNULL );
assert( TK_NOTNULL==OP_NotNull ); testcase( op==TK_NOTNULL );
sqlite3VdbeAddOp2(v, OP_Integer, 1, target);
r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, ®Free1);
testcase( regFree1==0 );
addr = sqlite3VdbeAddOp1(v, op, r1);
VdbeCoverageIf(v, op==TK_ISNULL);
VdbeCoverageIf(v, op==TK_NOTNULL);
sqlite3VdbeAddOp2(v, OP_Integer, 0, target);
sqlite3VdbeJumpHere(v, addr);
break;
}
case TK_AGG_FUNCTION: {
AggInfo *pInfo = pExpr->pAggInfo;
if( pInfo==0
|| NEVER(pExpr->iAgg<0)
|| NEVER(pExpr->iAgg>=pInfo->nFunc)
){
assert( !ExprHasProperty(pExpr, EP_IntValue) );
sqlite3ErrorMsg(pParse, "misuse of aggregate: %s()", pExpr->u.zToken);
}else{
return pInfo->aFunc[pExpr->iAgg].iMem;
}
break;
}
case TK_FUNCTION: {
ExprList *pFarg; /* List of function arguments */
int nFarg; /* Number of function arguments */
FuncDef *pDef; /* The function definition object */
const char *zId; /* The function name */
u32 constMask = 0; /* Mask of function arguments that are constant */
int i; /* Loop counter */
sqlite3 *db = pParse->db; /* The database connection */
u8 enc = ENC(db); /* The text encoding used by this database */
CollSeq *pColl = 0; /* A collating sequence */
#ifndef SQLITE_OMIT_WINDOWFUNC
if( ExprHasProperty(pExpr, EP_WinFunc) ){
return pExpr->y.pWin->regResult;
}
#endif
if( ConstFactorOk(pParse) && sqlite3ExprIsConstantNotJoin(pExpr) ){
/* SQL functions can be expensive. So try to avoid running them
** multiple times if we know they always give the same result */
return sqlite3ExprCodeRunJustOnce(pParse, pExpr, -1);
}
assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
assert( !ExprHasProperty(pExpr, EP_TokenOnly) );
pFarg = pExpr->x.pList;
nFarg = pFarg ? pFarg->nExpr : 0;
assert( !ExprHasProperty(pExpr, EP_IntValue) );
zId = pExpr->u.zToken;
pDef = sqlite3FindFunction(db, zId, nFarg, enc, 0);
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
if( pDef==0 && pParse->explain ){
pDef = sqlite3FindFunction(db, "unknown", nFarg, enc, 0);
}
#endif
if( pDef==0 || pDef->xFinalize!=0 ){
sqlite3ErrorMsg(pParse, "unknown function: %s()", zId);
break;
}
if( pDef->funcFlags & SQLITE_FUNC_INLINE ){
assert( (pDef->funcFlags & SQLITE_FUNC_UNSAFE)==0 );
assert( (pDef->funcFlags & SQLITE_FUNC_DIRECT)==0 );
return exprCodeInlineFunction(pParse, pFarg,
SQLITE_PTR_TO_INT(pDef->pUserData), target);
}else if( pDef->funcFlags & (SQLITE_FUNC_DIRECT|SQLITE_FUNC_UNSAFE) ){
sqlite3ExprFunctionUsable(pParse, pExpr, pDef);
}
for(i=0; i<nFarg; i++){
if( i<32 && sqlite3ExprIsConstant(pFarg->a[i].pExpr) ){
testcase( i==31 );
constMask |= MASKBIT32(i);
}
if( (pDef->funcFlags & SQLITE_FUNC_NEEDCOLL)!=0 && !pColl ){
pColl = sqlite3ExprCollSeq(pParse, pFarg->a[i].pExpr);
}
}
if( pFarg ){
if( constMask ){
r1 = pParse->nMem+1;
pParse->nMem += nFarg;
}else{
r1 = sqlite3GetTempRange(pParse, nFarg);
}
/* For length() and typeof() functions with a column argument,
** set the P5 parameter to the OP_Column opcode to OPFLAG_LENGTHARG
** or OPFLAG_TYPEOFARG respectively, to avoid unnecessary data
** loading.
*/
if( (pDef->funcFlags & (SQLITE_FUNC_LENGTH|SQLITE_FUNC_TYPEOF))!=0 ){
u8 exprOp;
assert( nFarg==1 );
assert( pFarg->a[0].pExpr!=0 );
exprOp = pFarg->a[0].pExpr->op;
if( exprOp==TK_COLUMN || exprOp==TK_AGG_COLUMN ){
assert( SQLITE_FUNC_LENGTH==OPFLAG_LENGTHARG );
assert( SQLITE_FUNC_TYPEOF==OPFLAG_TYPEOFARG );
testcase( pDef->funcFlags & OPFLAG_LENGTHARG );
pFarg->a[0].pExpr->op2 =
pDef->funcFlags & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG);
}
}
sqlite3ExprCodeExprList(pParse, pFarg, r1, 0,
SQLITE_ECEL_DUP|SQLITE_ECEL_FACTOR);
}else{
r1 = 0;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
/* Possibly overload the function if the first argument is
** a virtual table column.
**
** For infix functions (LIKE, GLOB, REGEXP, and MATCH) use the
** second argument, not the first, as the argument to test to
** see if it is a column in a virtual table. This is done because
** the left operand of infix functions (the operand we want to
** control overloading) ends up as the second argument to the
** function. The expression "A glob B" is equivalent to
** "glob(B,A). We want to use the A in "A glob B" to test
** for function overloading. But we use the B term in "glob(B,A)".
*/
if( nFarg>=2 && ExprHasProperty(pExpr, EP_InfixFunc) ){
pDef = sqlite3VtabOverloadFunction(db, pDef, nFarg, pFarg->a[1].pExpr);
}else if( nFarg>0 ){
pDef = sqlite3VtabOverloadFunction(db, pDef, nFarg, pFarg->a[0].pExpr);
}
#endif
if( pDef->funcFlags & SQLITE_FUNC_NEEDCOLL ){
if( !pColl ) pColl = db->pDfltColl;
sqlite3VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
}
#ifdef SQLITE_ENABLE_OFFSET_SQL_FUNC
if( pDef->funcFlags & SQLITE_FUNC_OFFSET ){
Expr *pArg = pFarg->a[0].pExpr;
if( pArg->op==TK_COLUMN ){
sqlite3VdbeAddOp3(v, OP_Offset, pArg->iTable, pArg->iColumn, target);
}else{
sqlite3VdbeAddOp2(v, OP_Null, 0, target);
}
}else
#endif
{
sqlite3VdbeAddFunctionCall(pParse, constMask, r1, target, nFarg,
pDef, pExpr->op2);
}
if( nFarg ){
if( constMask==0 ){
sqlite3ReleaseTempRange(pParse, r1, nFarg);
}else{
sqlite3VdbeReleaseRegisters(pParse, r1, nFarg, constMask, 1);
}
}
return target;
}
#ifndef SQLITE_OMIT_SUBQUERY
case TK_EXISTS:
case TK_SELECT: {
int nCol;
testcase( op==TK_EXISTS );
testcase( op==TK_SELECT );
if( pParse->db->mallocFailed ){
return 0;
}else if( op==TK_SELECT && (nCol = pExpr->x.pSelect->pEList->nExpr)!=1 ){
sqlite3SubselectError(pParse, nCol, 1);
}else{
return sqlite3CodeSubselect(pParse, pExpr);
}
break;
}
case TK_SELECT_COLUMN: {
int n;
if( pExpr->pLeft->iTable==0 ){
pExpr->pLeft->iTable = sqlite3CodeSubselect(pParse, pExpr->pLeft);
}
assert( pExpr->iTable==0 || pExpr->pLeft->op==TK_SELECT );
if( pExpr->iTable!=0
&& pExpr->iTable!=(n = sqlite3ExprVectorSize(pExpr->pLeft))
){
sqlite3ErrorMsg(pParse, "%d columns assigned %d values",
pExpr->iTable, n);
}
return pExpr->pLeft->iTable + pExpr->iColumn;
}
case TK_IN: {
int destIfFalse = sqlite3VdbeMakeLabel(pParse);
int destIfNull = sqlite3VdbeMakeLabel(pParse);
sqlite3VdbeAddOp2(v, OP_Null, 0, target);
sqlite3ExprCodeIN(pParse, pExpr, destIfFalse, destIfNull);
sqlite3VdbeAddOp2(v, OP_Integer, 1, target);
sqlite3VdbeResolveLabel(v, destIfFalse);
sqlite3VdbeAddOp2(v, OP_AddImm, target, 0);
sqlite3VdbeResolveLabel(v, destIfNull);
return target;
}
#endif /* SQLITE_OMIT_SUBQUERY */
/*
** x BETWEEN y AND z
**
** This is equivalent to
**
** x>=y AND x<=z
**
** X is stored in pExpr->pLeft.
** Y is stored in pExpr->pList->a[0].pExpr.
** Z is stored in pExpr->pList->a[1].pExpr.
*/
case TK_BETWEEN: {
exprCodeBetween(pParse, pExpr, target, 0, 0);
return target;
}
case TK_SPAN:
case TK_COLLATE:
case TK_UPLUS: {
pExpr = pExpr->pLeft;
goto expr_code_doover; /* 2018-04-28: Prevent deep recursion. OSSFuzz. */
}
case TK_TRIGGER: {
/* If the opcode is TK_TRIGGER, then the expression is a reference
** to a column in the new.* or old.* pseudo-tables available to
** trigger programs. In this case Expr.iTable is set to 1 for the
** new.* pseudo-table, or 0 for the old.* pseudo-table. Expr.iColumn
** is set to the column of the pseudo-table to read, or to -1 to
** read the rowid field.
**
** The expression is implemented using an OP_Param opcode. The p1
** parameter is set to 0 for an old.rowid reference, or to (i+1)
** to reference another column of the old.* pseudo-table, where
** i is the index of the column. For a new.rowid reference, p1 is
** set to (n+1), where n is the number of columns in each pseudo-table.
** For a reference to any other column in the new.* pseudo-table, p1
** is set to (n+2+i), where n and i are as defined previously. For
** example, if the table on which triggers are being fired is
** declared as:
**
** CREATE TABLE t1(a, b);
**
** Then p1 is interpreted as follows:
**
** p1==0 -> old.rowid p1==3 -> new.rowid
** p1==1 -> old.a p1==4 -> new.a
** p1==2 -> old.b p1==5 -> new.b
*/
Table *pTab = pExpr->y.pTab;
int iCol = pExpr->iColumn;
int p1 = pExpr->iTable * (pTab->nCol+1) + 1
+ sqlite3TableColumnToStorage(pTab, iCol);
assert( pExpr->iTable==0 || pExpr->iTable==1 );
assert( iCol>=-1 && iCol<pTab->nCol );
assert( pTab->iPKey<0 || iCol!=pTab->iPKey );
assert( p1>=0 && p1<(pTab->nCol*2+2) );
sqlite3VdbeAddOp2(v, OP_Param, p1, target);
VdbeComment((v, "r[%d]=%s.%s", target,
(pExpr->iTable ? "new" : "old"),
(pExpr->iColumn<0 ? "rowid" : pExpr->y.pTab->aCol[iCol].zName)
));
#ifndef SQLITE_OMIT_FLOATING_POINT
/* If the column has REAL affinity, it may currently be stored as an
** integer. Use OP_RealAffinity to make sure it is really real.
**
** EVIDENCE-OF: R-60985-57662 SQLite will convert the value back to
** floating point when extracting it from the record. */
if( iCol>=0 && pTab->aCol[iCol].affinity==SQLITE_AFF_REAL ){
sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
}
#endif
break;
}
case TK_VECTOR: {
sqlite3ErrorMsg(pParse, "row value misused");
break;
}
/* TK_IF_NULL_ROW Expr nodes are inserted ahead of expressions
** that derive from the right-hand table of a LEFT JOIN. The
** Expr.iTable value is the table number for the right-hand table.
** The expression is only evaluated if that table is not currently
** on a LEFT JOIN NULL row.
*/
case TK_IF_NULL_ROW: {
int addrINR;
u8 okConstFactor = pParse->okConstFactor;
addrINR = sqlite3VdbeAddOp1(v, OP_IfNullRow, pExpr->iTable);
/* Temporarily disable factoring of constant expressions, since
** even though expressions may appear to be constant, they are not
** really constant because they originate from the right-hand side
** of a LEFT JOIN. */
pParse->okConstFactor = 0;
inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
pParse->okConstFactor = okConstFactor;
sqlite3VdbeJumpHere(v, addrINR);
sqlite3VdbeChangeP3(v, addrINR, inReg);
break;
}
/*
** Form A:
** CASE x WHEN e1 THEN r1 WHEN e2 THEN r2 ... WHEN eN THEN rN ELSE y END
**
** Form B:
** CASE WHEN e1 THEN r1 WHEN e2 THEN r2 ... WHEN eN THEN rN ELSE y END
**
** Form A is can be transformed into the equivalent form B as follows:
** CASE WHEN x=e1 THEN r1 WHEN x=e2 THEN r2 ...
** WHEN x=eN THEN rN ELSE y END
**
** X (if it exists) is in pExpr->pLeft.
** Y is in the last element of pExpr->x.pList if pExpr->x.pList->nExpr is
** odd. The Y is also optional. If the number of elements in x.pList
** is even, then Y is omitted and the "otherwise" result is NULL.
** Ei is in pExpr->pList->a[i*2] and Ri is pExpr->pList->a[i*2+1].
**
** The result of the expression is the Ri for the first matching Ei,
** or if there is no matching Ei, the ELSE term Y, or if there is
** no ELSE term, NULL.
*/
case TK_CASE: {
int endLabel; /* GOTO label for end of CASE stmt */
int nextCase; /* GOTO label for next WHEN clause */
int nExpr; /* 2x number of WHEN terms */
int i; /* Loop counter */
ExprList *pEList; /* List of WHEN terms */
struct ExprList_item *aListelem; /* Array of WHEN terms */
Expr opCompare; /* The X==Ei expression */
Expr *pX; /* The X expression */
Expr *pTest = 0; /* X==Ei (form A) or just Ei (form B) */
Expr *pDel = 0;
sqlite3 *db = pParse->db;
assert( !ExprHasProperty(pExpr, EP_xIsSelect) && pExpr->x.pList );
assert(pExpr->x.pList->nExpr > 0);
pEList = pExpr->x.pList;
aListelem = pEList->a;
nExpr = pEList->nExpr;
endLabel = sqlite3VdbeMakeLabel(pParse);
if( (pX = pExpr->pLeft)!=0 ){
pDel = sqlite3ExprDup(db, pX, 0);
if( db->mallocFailed ){
sqlite3ExprDelete(db, pDel);
break;
}
testcase( pX->op==TK_COLUMN );
exprToRegister(pDel, exprCodeVector(pParse, pDel, ®Free1));
testcase( regFree1==0 );
memset(&opCompare, 0, sizeof(opCompare));
opCompare.op = TK_EQ;
opCompare.pLeft = pDel;
pTest = &opCompare;
/* Ticket b351d95f9cd5ef17e9d9dbae18f5ca8611190001:
** The value in regFree1 might get SCopy-ed into the file result.
** So make sure that the regFree1 register is not reused for other
** purposes and possibly overwritten. */
regFree1 = 0;
}
for(i=0; i<nExpr-1; i=i+2){
if( pX ){
assert( pTest!=0 );
opCompare.pRight = aListelem[i].pExpr;
}else{
pTest = aListelem[i].pExpr;
}
nextCase = sqlite3VdbeMakeLabel(pParse);
testcase( pTest->op==TK_COLUMN );
sqlite3ExprIfFalse(pParse, pTest, nextCase, SQLITE_JUMPIFNULL);
testcase( aListelem[i+1].pExpr->op==TK_COLUMN );
sqlite3ExprCode(pParse, aListelem[i+1].pExpr, target);
sqlite3VdbeGoto(v, endLabel);
sqlite3VdbeResolveLabel(v, nextCase);
}
if( (nExpr&1)!=0 ){
sqlite3ExprCode(pParse, pEList->a[nExpr-1].pExpr, target);
}else{
sqlite3VdbeAddOp2(v, OP_Null, 0, target);
}
sqlite3ExprDelete(db, pDel);
setDoNotMergeFlagOnCopy(v);
sqlite3VdbeResolveLabel(v, endLabel);
break;
}
#ifndef SQLITE_OMIT_TRIGGER
case TK_RAISE: {
assert( pExpr->affExpr==OE_Rollback
|| pExpr->affExpr==OE_Abort
|| pExpr->affExpr==OE_Fail
|| pExpr->affExpr==OE_Ignore
);
if( !pParse->pTriggerTab && !pParse->nested ){
sqlite3ErrorMsg(pParse,
"RAISE() may only be used within a trigger-program");
return 0;
}
if( pExpr->affExpr==OE_Abort ){
sqlite3MayAbort(pParse);
}
assert( !ExprHasProperty(pExpr, EP_IntValue) );
if( pExpr->affExpr==OE_Ignore ){
sqlite3VdbeAddOp4(
v, OP_Halt, SQLITE_OK, OE_Ignore, 0, pExpr->u.zToken,0);
VdbeCoverage(v);
}else{
sqlite3HaltConstraint(pParse,
pParse->pTriggerTab ? SQLITE_CONSTRAINT_TRIGGER : SQLITE_ERROR,
pExpr->affExpr, pExpr->u.zToken, 0, 0);
}
break;
}
#endif
}
sqlite3ReleaseTempReg(pParse, regFree1);
sqlite3ReleaseTempReg(pParse, regFree2);
return inReg;
}