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Improvements to the initialization of the push-down automoton for the
Lemon-generated parser. Smaller and faster. FossilOrigin-Name: 3b28b68e232060f8b2fe2fe6fa478280da2006ff
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@ -275,12 +275,15 @@ static const char *const yyRuleName[] = {
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*/
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static void yyGrowStack(yyParser *p){
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int newSize;
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int idx;
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yyStackEntry *pNew;
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newSize = p->yystksz*2 + 100;
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idx = p->yytos ? (int)(p->yytos - p->yystack) : 0;
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pNew = realloc(p->yystack, newSize*sizeof(pNew[0]));
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if( pNew ){
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p->yystack = pNew;
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p->yytos = &p->yystack[idx];
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p->yystksz = newSize;
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#ifndef NDEBUG
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if( yyTraceFILE ){
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@ -317,15 +320,18 @@ void *ParseAlloc(void *(*mallocProc)(YYMALLOCARGTYPE)){
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yyParser *pParser;
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pParser = (yyParser*)(*mallocProc)( (YYMALLOCARGTYPE)sizeof(yyParser) );
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if( pParser ){
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pParser->yytos = 0;
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#ifdef YYTRACKMAXSTACKDEPTH
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pParser->yyhwm = 0;
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#endif
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#if YYSTACKDEPTH<=0
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pParser->yytos = NULL;
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pParser->yystack = NULL;
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pParser->yystksz = 0;
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yyGrowStack(pParser);
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#endif
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pParser->yytos = pParser->yystack;
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pParser->yystack[0].stateno = 0;
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pParser->yystack[0].major = 0;
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}
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return pParser;
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}
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@ -397,7 +403,7 @@ void ParseFree(
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#ifndef YYPARSEFREENEVERNULL
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if( pParser==0 ) return;
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#endif
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while( pParser->yytos>=pParser->yystack ) yy_pop_parser_stack(pParser);
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while( pParser->yytos>pParser->yystack ) yy_pop_parser_stack(pParser);
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#if YYSTACKDEPTH<=0
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free(pParser->yystack);
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#endif
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@ -522,7 +528,7 @@ static void yyStackOverflow(yyParser *yypParser){
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fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
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}
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#endif
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while( yypParser->yytos>=yypParser->yystack ) yy_pop_parser_stack(yypParser);
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while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will execute if the parser
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** stack every overflows */
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/******** Begin %stack_overflow code ******************************************/
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@ -695,8 +701,7 @@ static void yy_parse_failed(
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fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
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}
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#endif
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while( yypParser->yytos>=yypParser->yystack ) yy_pop_parser_stack(yypParser);
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yypParser->yytos = 0;
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while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will be executed whenever the
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** parser fails */
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/************ Begin %parse_failure code ***************************************/
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@ -734,8 +739,7 @@ static void yy_accept(
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fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
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}
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#endif
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while( yypParser->yytos>=yypParser->yystack ) yy_pop_parser_stack(yypParser);
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yypParser->yytos = 0;
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while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will be executed whenever the
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** parser accepts */
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/*********** Begin %parse_accept code *****************************************/
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@ -781,26 +785,7 @@ void Parse(
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/* (re)initialize the parser, if necessary */
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yypParser = (yyParser*)yyp;
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if( yypParser->yytos==0 ){
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#if YYSTACKDEPTH<=0
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if( yypParser->yystksz <=0 ){
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yyStackOverflow(yypParser);
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return;
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}
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#endif
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yypParser->yytos = yypParser->yystack;
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#ifndef YYNOERRORRECOVERY
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yypParser->yyerrcnt = -1;
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#endif
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yypParser->yystack[0].stateno = 0;
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yypParser->yystack[0].major = 0;
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#ifndef NDEBUG
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if( yyTraceFILE ){
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fprintf(yyTraceFILE,"%sInitialize. Empty stack. State 0\n",
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yyTracePrompt);
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}
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#endif
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}
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assert( yypParser->yytos!=0 );
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#if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
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yyendofinput = (yymajor==0);
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#endif
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@ -921,7 +906,7 @@ void Parse(
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yymajor = YYNOCODE;
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#endif
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}
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}while( yymajor!=YYNOCODE && yypParser->yytos>=yypParser->yystack );
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}while( yymajor!=YYNOCODE && yypParser->yytos>yypParser->yystack );
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#ifndef NDEBUG
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if( yyTraceFILE ){
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yyStackEntry *i;
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