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Overview
| Comment: | Fix the VList object so that it actually works. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | VList |
| Files: | files | file ages | folders |
| SHA1: | 9dcd85698af46fd5ba34004ca690d368c4ae3078 |
| User & Date: | drh 2016-12-23 13:30:53 |
Context
|
2016-12-23
| ||
| 13:52 | Add check to prevent a VList from growing after pointers to labels have been taken. Closed-Leaf check-in: aa23d7ea user: drh tags: VList | |
| 13:30 | Fix the VList object so that it actually works. check-in: 9dcd8569 user: drh tags: VList | |
| 03:59 | Use the VList object to replace Parse.azVar for tracking the mapping between SQL parameter names and parameter numbers. There is a performance improvement, though there are still a few hiccups in the current code. check-in: 68ecafa1 user: drh tags: VList | |
Changes
Changes to src/expr.c.
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** as the previous instance of the same wildcard. Or if this is the first
** instance of the wildcard, the next sequential variable number is
** assigned.
*/
void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr, u32 n){
sqlite3 *db = pParse->db;
const char *z;
if( pExpr==0 ) return;
assert( !ExprHasProperty(pExpr, EP_IntValue|EP_Reduced|EP_TokenOnly) );
z = pExpr->u.zToken;
assert( z!=0 );
assert( z[0]!=0 );
assert( n==sqlite3Strlen30(z) );
if( z[1]==0 ){
/* Wildcard of the form "?". Assign the next variable number */
assert( z[0]=='?' );
pExpr->iColumn = (ynVar)(++pParse->nVar);
}else{
ynVar x;
if( z[0]=='?' ){
/* Wildcard of the form "?nnn". Convert "nnn" to an integer and
** use it as the variable number */
i64 i;
int bOk = 0==sqlite3Atoi64(&z[1], &i, n-1, SQLITE_UTF8);
x = (ynVar)i;
testcase( i==0 );
................................................................................
testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]-1 );
testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] );
if( bOk==0 || i<1 || i>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
sqlite3ErrorMsg(pParse, "variable number must be between ?1 and ?%d",
db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]);
return;
}
if( i>pParse->nVar ){
pParse->nVar = (int)i;
}
}else{
/* Wildcards like ":aaa", "$aaa" or "@aaa". Reuse the same variable
** number as the prior appearance of the same name, or if the name
** has never appeared before, reuse the same variable number
*/
x = (ynVar)sqlite3VListNameToNum(pParse->pVList, z, n);
if( x==0 ){
x = (ynVar)(++pParse->nVar);
pParse->pVList = sqlite3VListAdd(db, pParse->pVList, z, n, x);
}
}
pExpr->iColumn = x;
}
if( pParse->nVar>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
sqlite3ErrorMsg(pParse, "too many SQL variables");
}
}
/*
** Recursively delete an expression tree.
*/
................................................................................
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);
if( z ){
assert( pExpr->u.zToken[0]=='?' || strcmp(pExpr->u.zToken, z)==0 );
sqlite3VdbeAppendP4(v, (char*)z, P4_STATIC);
}
}
return target;
}
case TK_REGISTER: {
return pExpr->iTable;
}
#ifndef SQLITE_OMIT_CAST
|
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941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 ... 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 .... 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 |
** as the previous instance of the same wildcard. Or if this is the first
** instance of the wildcard, the next sequential variable number is
** assigned.
*/
void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr, u32 n){
sqlite3 *db = pParse->db;
const char *z;
ynVar x;
if( pExpr==0 ) return;
assert( !ExprHasProperty(pExpr, EP_IntValue|EP_Reduced|EP_TokenOnly) );
z = pExpr->u.zToken;
assert( z!=0 );
assert( z[0]!=0 );
assert( n==sqlite3Strlen30(z) );
if( z[1]==0 ){
/* Wildcard of the form "?". Assign the next variable number */
assert( z[0]=='?' );
x = (ynVar)(++pParse->nVar);
}else{
int doAdd = 0;
if( z[0]=='?' ){
/* Wildcard of the form "?nnn". Convert "nnn" to an integer and
** use it as the variable number */
i64 i;
int bOk = 0==sqlite3Atoi64(&z[1], &i, n-1, SQLITE_UTF8);
x = (ynVar)i;
testcase( i==0 );
................................................................................
testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]-1 );
testcase( i==db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] );
if( bOk==0 || i<1 || i>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
sqlite3ErrorMsg(pParse, "variable number must be between ?1 and ?%d",
db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER]);
return;
}
if( x>pParse->nVar ){
pParse->nVar = (int)x;
doAdd = 1;
}else if( sqlite3VListNumToName(pParse->pVList, x)==0 ){
doAdd = 1;
}
}else{
/* Wildcards like ":aaa", "$aaa" or "@aaa". Reuse the same variable
** number as the prior appearance of the same name, or if the name
** has never appeared before, reuse the same variable number
*/
x = (ynVar)sqlite3VListNameToNum(pParse->pVList, z, n);
if( x==0 ){
x = (ynVar)(++pParse->nVar);
doAdd = 1;
}
}
if( doAdd ){
pParse->pVList = sqlite3VListAdd(db, pParse->pVList, z, n, x);
}
}
pExpr->iColumn = x;
if( x>db->aLimit[SQLITE_LIMIT_VARIABLE_NUMBER] ){
sqlite3ErrorMsg(pParse, "too many SQL variables");
}
}
/*
** Recursively delete an expression tree.
*/
................................................................................
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]=='?' || strcmp(pExpr->u.zToken, z)==0 );
sqlite3VdbeAppendP4(v, (char*)z, P4_STATIC);
}
return target;
}
case TK_REGISTER: {
return pExpr->iTable;
}
#ifndef SQLITE_OMIT_CAST
|
Changes to src/vdbeaux.c.
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**
** The difference between this function and sqlite3VdbeDelete() is that
** VdbeDelete() also unlinks the Vdbe from the list of VMs associated with
** the database connection and frees the object itself.
*/
void sqlite3VdbeClearObject(sqlite3 *db, Vdbe *p){
SubProgram *pSub, *pNext;
int i;
assert( p->db==0 || p->db==db );
releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
for(pSub=p->pProgram; pSub; pSub=pNext){
pNext = pSub->pNext;
vdbeFreeOpArray(db, pSub->aOp, pSub->nOp);
sqlite3DbFree(db, pSub);
}
................................................................................
sqlite3DbFree(db, p->pVList);
sqlite3DbFree(db, p->pFree);
}
vdbeFreeOpArray(db, p->aOp, p->nOp);
sqlite3DbFree(db, p->aColName);
sqlite3DbFree(db, p->zSql);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
for(i=0; i<p->nScan; i++){
sqlite3DbFree(db, p->aScan[i].zName);
}
sqlite3DbFree(db, p->aScan);
#endif
}
/*
** Delete an entire VDBE.
*/
void sqlite3VdbeDelete(Vdbe *p){
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....
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**
** The difference between this function and sqlite3VdbeDelete() is that
** VdbeDelete() also unlinks the Vdbe from the list of VMs associated with
** the database connection and frees the object itself.
*/
void sqlite3VdbeClearObject(sqlite3 *db, Vdbe *p){
SubProgram *pSub, *pNext;
assert( p->db==0 || p->db==db );
releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
for(pSub=p->pProgram; pSub; pSub=pNext){
pNext = pSub->pNext;
vdbeFreeOpArray(db, pSub->aOp, pSub->nOp);
sqlite3DbFree(db, pSub);
}
................................................................................
sqlite3DbFree(db, p->pVList);
sqlite3DbFree(db, p->pFree);
}
vdbeFreeOpArray(db, p->aOp, p->nOp);
sqlite3DbFree(db, p->aColName);
sqlite3DbFree(db, p->zSql);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
{
int i;
for(i=0; i<p->nScan; i++){
sqlite3DbFree(db, p->aScan[i].zName);
}
sqlite3DbFree(db, p->aScan);
}
#endif
}
/*
** Delete an entire VDBE.
*/
void sqlite3VdbeDelete(Vdbe *p){
|