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Overview
| Comment: | Do not try to eliminate No-ops at the end of VDBE program as this can cause problems for some DISTINCT handling algorithms, and does not improve performance. This also fixes an assertion fault found by libFuzzer. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 19d9f9ce691963310fa73ac5ff728ea8 |
| User & Date: | drh 2015-11-24 00:49:44 |
References
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2015-11-24
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| 03:50 | Add a test case for the fix of check-in [19d9f9ce691963310] check-in: 19a9c07b user: drh tags: trunk | |
Context
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2015-11-24
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| 01:17 | Add a clarifying comment to the virtual table test module 'test8'. check-in: e92f97a6 user: mistachkin tags: trunk | |
| 00:49 | Do not try to eliminate No-ops at the end of VDBE program as this can cause problems for some DISTINCT handling algorithms, and does not improve performance. This also fixes an assertion fault found by libFuzzer. check-in: 19d9f9ce user: drh tags: trunk | |
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2015-11-21
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| 19:43 | Fix an obscure memory leak found by libfuzzer that may occur under some circumstances if expanding a "*" expression causes a SELECT to return more than 32767 columns. check-in: 60de5f23 user: dan tags: trunk | |
Changes
Changes to src/vdbeaux.c.
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 |
void sqlite3VdbeChangeToNoop(Vdbe *p, int addr){
if( addr<p->nOp ){
VdbeOp *pOp = &p->aOp[addr];
sqlite3 *db = p->db;
freeP4(db, pOp->p4type, pOp->p4.p);
memset(pOp, 0, sizeof(pOp[0]));
pOp->opcode = OP_Noop;
if( addr==p->nOp-1 ) p->nOp--;
}
}
/*
** If the last opcode is "op" and it is not a jump destination,
** then remove it. Return true if and only if an opcode was removed.
*/
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< |
833 834 835 836 837 838 839 840 841 842 843 844 845 846 |
void sqlite3VdbeChangeToNoop(Vdbe *p, int addr){
if( addr<p->nOp ){
VdbeOp *pOp = &p->aOp[addr];
sqlite3 *db = p->db;
freeP4(db, pOp->p4type, pOp->p4.p);
memset(pOp, 0, sizeof(pOp[0]));
pOp->opcode = OP_Noop;
}
}
/*
** If the last opcode is "op" and it is not a jump destination,
** then remove it. Return true if and only if an opcode was removed.
*/
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