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Enhance the IdList object to exist in a single memory allocation (rather than

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a separate allocate for the base object and the array of IDs).  Also permit
an IdList object to store an Expr pointer together with each name.

FossilOrigin-Name: 40f3c95871e6f40f287ef2756abafb8fc56dffdd0af69436e5c7d8e95022d94e
This commit is contained in:
drh
2022-04-15 15:47:14 +00:00
parent 358424aeff
commit a99e325468
7 changed files with 65 additions and 41 deletions
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16
src/expr.c
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@@ -1698,22 +1698,16 @@ IdList *sqlite3IdListDup(sqlite3 *db, const IdList *p){
int i;
assert( db!=0 );
if( p==0 ) return 0;
pNew = sqlite3DbMallocRawNN(db, sizeof(*pNew) );
assert( p->eU4!=EU4_EXPR );
pNew = sqlite3DbMallocRawNN(db, sizeof(*pNew)+(p->nId-1)*sizeof(p->a[0]) );
if( pNew==0 ) return 0;
pNew->nId = p->nId;
pNew->a = sqlite3DbMallocRawNN(db, p->nId*sizeof(p->a[0]) );
if( pNew->a==0 ){
sqlite3DbFreeNN(db, pNew);
return 0;
}
/* Note that because the size of the allocation for p->a[] is not
** necessarily a power of two, sqlite3IdListAppend() may not be called
** on the duplicate created by this function. */
pNew->eU4 = p->eU4;
for(i=0; i<p->nId; i++){
struct IdList_item *pNewItem = &pNew->a[i];
struct IdList_item *pOldItem = &p->a[i];
const struct IdList_item *pOldItem = &p->a[i];
pNewItem->zName = sqlite3DbStrDup(db, pOldItem->zName);
pNewItem->idx = pOldItem->idx;
pNewItem->u4 = pOldItem->u4;
}
return pNew;
}