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Allocate Parse objects off of the stack where appropriate for a substantial

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performance increase and a size reduction.

FossilOrigin-Name: ea8affa9e453b201b479162f621b591e7a65a489
This commit is contained in:
drh
2016-10-03 01:21:51 +00:00
parent 1a7df58c1a
commit cb43a937e5
6 changed files with 53 additions and 71 deletions
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22
src/backup.c
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@@ -83,22 +83,16 @@ static Btree *findBtree(sqlite3 *pErrorDb, sqlite3 *pDb, const char *zDb){
int i = sqlite3FindDbName(pDb, zDb);
if( i==1 ){
Parse *pParse;
Parse sParse;
int rc = 0;
pParse = sqlite3StackAllocZero(pErrorDb, sizeof(*pParse));
if( pParse==0 ){
sqlite3ErrorWithMsg(pErrorDb, SQLITE_NOMEM, "out of memory");
rc = SQLITE_NOMEM_BKPT;
}else{
pParse->db = pDb;
if( sqlite3OpenTempDatabase(pParse) ){
sqlite3ErrorWithMsg(pErrorDb, pParse->rc, "%s", pParse->zErrMsg);
rc = SQLITE_ERROR;
}
sqlite3DbFree(pErrorDb, pParse->zErrMsg);
sqlite3ParserReset(pParse);
sqlite3StackFree(pErrorDb, pParse);
memset(&sParse, 0, sizeof(sParse));
sParse.db = pDb;
if( sqlite3OpenTempDatabase(&sParse) ){
sqlite3ErrorWithMsg(pErrorDb, sParse.rc, "%s", sParse.zErrMsg);
rc = SQLITE_ERROR;
}
sqlite3DbFree(pErrorDb, sParse.zErrMsg);
sqlite3ParserReset(&sParse);
if( rc ){
return 0;
}