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In the amalgamation, allocate the parser engine object from stack rather than

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from heap, for improved performance.  This only happens in the amalgamation,
since otherwise the sqlite3RunParser() routine does not know the object size.

FossilOrigin-Name: 4fe879d4b5da6ae0688a7a99004683a234966597
This commit is contained in:
drh
2017-01-28 20:46:37 +00:00
parent 51b15c3871
commit d26cc54183
6 changed files with 84 additions and 40 deletions
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12
src/tokenize.c
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@@ -481,6 +481,9 @@ int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
int lastTokenParsed = -1; /* type of the previous token */
sqlite3 *db = pParse->db; /* The database connection */
int mxSqlLen; /* Max length of an SQL string */
#ifdef sqlite3Parser_ENGINEALWAYSONSTACK
unsigned char zSpace[sizeof(yyParser)]; /* Space for parser engine object */
#endif
assert( zSql!=0 );
mxSqlLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH];
@@ -492,11 +495,16 @@ int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
i = 0;
assert( pzErrMsg!=0 );
/* sqlite3ParserTrace(stdout, "parser: "); */
#ifdef sqlite3Parser_ENGINEALWAYSONSTACK
pEngine = zSpace;
sqlite3ParserInit(pEngine);
#else
pEngine = sqlite3ParserAlloc(sqlite3Malloc);
if( pEngine==0 ){
sqlite3OomFault(db);
return SQLITE_NOMEM_BKPT;
}
#endif
assert( pParse->pNewTable==0 );
assert( pParse->pNewTrigger==0 );
assert( pParse->nVar==0 );
@@ -548,7 +556,11 @@ int sqlite3RunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
);
sqlite3_mutex_leave(sqlite3MallocMutex());
#endif /* YYDEBUG */
#ifdef sqlite3Parser_ENGINEALWAYSONSTACK
sqlite3ParserFinalize(pEngine);
#else
sqlite3ParserFree(pEngine, sqlite3_free);
#endif
if( db->mallocFailed ){
pParse->rc = SQLITE_NOMEM_BKPT;
}