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Overview
| Comment: | Additional malloc sanity changes. Use sqlite3MemLink() on Index.zColAff and Table.zColAff as a proof of concept. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | malloc-enhancement |
| Files: | files | file ages | folders |
| SHA1: |
e5ecb15984e433b102e82eadb127d50b |
| User & Date: | drh 2010-07-24 19:08:13 |
Context
|
2010-07-25
| ||
| 02:12 | Further examples of using automatic deallocation to replace "delete" methods. check-in: da2f62c5 user: drh tags: malloc-enhancement | |
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2010-07-24
| ||
| 19:08 | Additional malloc sanity changes. Use sqlite3MemLink() on Index.zColAff and Table.zColAff as a proof of concept. check-in: e5ecb159 user: drh tags: malloc-enhancement | |
| 18:25 | Add infrastructure to support a hierarchy of memory allocations with automatic deallocation of substructure. check-in: 48ef221c user: drh tags: malloc-enhancement | |
Changes
Changes to src/build.c.
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/*
** Reclaim the memory used by an index
*/
static void freeIndex(sqlite3 *db, Index *p){
#ifndef SQLITE_OMIT_ANALYZE
sqlite3DeleteIndexSamples(p);
#endif
sqlite3DbFree(db, p->zColAff);
sqlite3DbFree(db, p);
}
/*
** Remove the given index from the index hash table, and free
** its memory structures.
**
................................................................................
/* Delete any foreign keys attached to this table. */
sqlite3FkDelete(db, pTable);
/* Delete the Table structure itself.
*/
sqliteResetColumnNames(db, pTable);
sqlite3DbFree(db, pTable->zName);
sqlite3DbFree(db, pTable->zColAff);
sqlite3SelectDelete(db, pTable->pSelect);
#ifndef SQLITE_OMIT_CHECK
sqlite3ExprDelete(db, pTable->pCheck);
#endif
sqlite3VtabClear(db, pTable);
sqlite3DbFree(db, pTable);
}
................................................................................
}
pRet = pIndex;
pIndex = 0;
}
/* Clean up before exiting */
exit_create_index:
if( pIndex ){
sqlite3DbFree(db, pIndex->zColAff);
sqlite3DbFree(db, pIndex);
}
sqlite3ExprListDelete(db, pList);
sqlite3SrcListDelete(db, pTblName);
sqlite3DbFree(db, zName);
return pRet;
}
/*
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/*
** Reclaim the memory used by an index
*/
static void freeIndex(sqlite3 *db, Index *p){
#ifndef SQLITE_OMIT_ANALYZE
sqlite3DeleteIndexSamples(p);
#endif
sqlite3DbFree(db, p);
}
/*
** Remove the given index from the index hash table, and free
** its memory structures.
**
................................................................................
/* Delete any foreign keys attached to this table. */
sqlite3FkDelete(db, pTable);
/* Delete the Table structure itself.
*/
sqliteResetColumnNames(db, pTable);
sqlite3DbFree(db, pTable->zName);
sqlite3SelectDelete(db, pTable->pSelect);
#ifndef SQLITE_OMIT_CHECK
sqlite3ExprDelete(db, pTable->pCheck);
#endif
sqlite3VtabClear(db, pTable);
sqlite3DbFree(db, pTable);
}
................................................................................
}
pRet = pIndex;
pIndex = 0;
}
/* Clean up before exiting */
exit_create_index:
sqlite3DbFree(db, pIndex);
sqlite3ExprListDelete(db, pList);
sqlite3SrcListDelete(db, pTblName);
sqlite3DbFree(db, zName);
return pRet;
}
/*
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Changes to src/insert.c.
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Table *pTab = pIdx->pTable;
sqlite3 *db = sqlite3VdbeDb(v);
pIdx->zColAff = (char *)sqlite3DbMallocRaw(0, pIdx->nColumn+2);
if( !pIdx->zColAff ){
db->mallocFailed = 1;
return 0;
}
for(n=0; n<pIdx->nColumn; n++){
pIdx->zColAff[n] = pTab->aCol[pIdx->aiColumn[n]].affinity;
}
pIdx->zColAff[n++] = SQLITE_AFF_NONE;
pIdx->zColAff[n] = 0;
}
................................................................................
sqlite3 *db = sqlite3VdbeDb(v);
zColAff = (char *)sqlite3DbMallocRaw(0, pTab->nCol+1);
if( !zColAff ){
db->mallocFailed = 1;
return;
}
for(i=0; i<pTab->nCol; i++){
zColAff[i] = pTab->aCol[i].affinity;
}
zColAff[pTab->nCol] = '\0';
pTab->zColAff = zColAff;
}
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>
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Table *pTab = pIdx->pTable;
sqlite3 *db = sqlite3VdbeDb(v);
pIdx->zColAff = (char *)sqlite3DbMallocRaw(0, pIdx->nColumn+2);
if( !pIdx->zColAff ){
db->mallocFailed = 1;
return 0;
}
sqlite3MemLink(pIdx, pIdx->zColAff);
for(n=0; n<pIdx->nColumn; n++){
pIdx->zColAff[n] = pTab->aCol[pIdx->aiColumn[n]].affinity;
}
pIdx->zColAff[n++] = SQLITE_AFF_NONE;
pIdx->zColAff[n] = 0;
}
................................................................................
sqlite3 *db = sqlite3VdbeDb(v);
zColAff = (char *)sqlite3DbMallocRaw(0, pTab->nCol+1);
if( !zColAff ){
db->mallocFailed = 1;
return;
}
sqlite3MemLink(pTab, zColAff);
for(i=0; i<pTab->nCol; i++){
zColAff[i] = pTab->aCol[i].affinity;
}
zColAff[pTab->nCol] = '\0';
pTab->zColAff = zColAff;
}
|
Changes to src/malloc.c.
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sqlite3GlobalConfig.m.xFree(p);
}
}
/*
** Free memory that might be associated with a particular database
** connection. All child allocations are also freed.
*/
void sqlite3DbFree(sqlite3 *db, void *pObj){
EMemHdr *p = (EMemHdr*)pObj;
assert( db==0 || sqlite3_mutex_held(db->mutex) );
if( p ) p--;
while( p ){
EMemHdr *pNext = p->pESibling;
assert( isValidEMem(p) );
if( p->pEChild ) sqlite3DbFree(db, (void*)&p->pEChild[1]);
if( isLookaside(db, p) ){
LookasideSlot *pBuf = (LookasideSlot*)p;
clearValidEMem(p);
pBuf->pNext = db->lookaside.pFree;
db->lookaside.pFree = pBuf;
db->lookaside.nOut--;
}else{
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> > > > > | > > | > |
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sqlite3GlobalConfig.m.xFree(p);
}
}
/*
** Free memory that might be associated with a particular database
** connection. All child allocations are also freed.
**
** pObj must be a top-level allocation in the heirarchy. It is not
** allowed to delete a child allocation since that would leave a
** dangling child pointer in the parent.
*/
void sqlite3DbFree(sqlite3 *db, void *pObj){
EMemHdr *p = (EMemHdr*)pObj;
assert( db==0 || sqlite3_mutex_held(db->mutex) );
if( p ) p--;
assert( p==0 || !isChildEMem(p) ); /* pObj is not child allocation */
while( p ){
EMemHdr *pNext = p->pESibling;
assert( isValidEMem(p) ); /* pObj and all siblings are valid */
if( p->pEChild ){
clearChildEMem(p->pEChild);
sqlite3DbFree(db, (void*)&p->pEChild[1]);
}
if( isLookaside(db, p) ){
LookasideSlot *pBuf = (LookasideSlot*)p;
clearValidEMem(p);
pBuf->pNext = db->lookaside.pFree;
db->lookaside.pFree = pBuf;
db->lookaside.nOut--;
}else{
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Changes to src/where.c.
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if( pInfo->needToFreeIdxStr ){
sqlite3_free(pInfo->idxStr);
}
sqlite3DbFree(db, pInfo);
}
if( pWInfo->a[i].plan.wsFlags & WHERE_TEMP_INDEX ){
Index *pIdx = pWInfo->a[i].plan.u.pIdx;
if( pIdx ){
sqlite3DbFree(db, pIdx->zColAff);
sqlite3DbFree(db, pIdx);
}
}
}
whereClauseClear(pWInfo->pWC);
sqlite3DbFree(db, pWInfo);
}
}
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if( pInfo->needToFreeIdxStr ){
sqlite3_free(pInfo->idxStr);
}
sqlite3DbFree(db, pInfo);
}
if( pWInfo->a[i].plan.wsFlags & WHERE_TEMP_INDEX ){
Index *pIdx = pWInfo->a[i].plan.u.pIdx;
sqlite3DbFree(db, pIdx);
}
}
whereClauseClear(pWInfo->pWC);
sqlite3DbFree(db, pWInfo);
}
}
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