diff --git a/src/zscript/zcc-parse.lemon b/src/zscript/zcc-parse.lemon index ee8296ff66..12cbb6625c 100644 --- a/src/zscript/zcc-parse.lemon +++ b/src/zscript/zcc-parse.lemon @@ -77,7 +77,7 @@ static void SetNodeLine(ZCC_TreeNode *name, int line) FString unexpected, expecting; int i; - int stateno = yypParser->yystack[yypParser->yyidx].stateno; + int stateno = yypParser->yytos->stateno; unexpected << "Unexpected " << ZCCTokenName(yymajor); diff --git a/tools/lemon/lempar.c b/tools/lemon/lempar.c index 0549a9dadc..0e360bab98 100644 --- a/tools/lemon/lempar.c +++ b/tools/lemon/lempar.c @@ -41,6 +41,7 @@ ***************** Begin makeheaders token definitions *************************/ %% /**************** End makeheaders token definitions ***************************/ + /* The next section is a series of control #defines. ** various aspects of the generated parser. ** YYCODETYPE is the data type used to store the integer codes @@ -50,8 +51,6 @@ ** YYNOCODE is a number of type YYCODETYPE that is not used for ** any terminal or nonterminal symbol. ** YYFALLBACK If defined, this indicates that one or more tokens -** have fall-back values which should be used if the -** original value of the token will not parse. ** (also known as: "terminal symbols") have fall-back ** values which should be used if the original symbol ** would not parse. This permits keywords to sometimes @@ -126,7 +125,7 @@ ** ** N between YY_MIN_REDUCE Reduce by rule N-YY_MIN_REDUCE ** and YY_MAX_REDUCE - +** ** N == YY_ERROR_ACTION A syntax error has occurred. ** ** N == YY_ACCEPT_ACTION The parser accepts its input. @@ -135,16 +134,20 @@ ** slots in the yy_action[] table. ** ** The action table is constructed as a single large table named yy_action[]. -** Given state S and lookahead X, the action is computed as +** Given state S and lookahead X, the action is computed as either: ** -** yy_action[ yy_shift_ofst[S] + X ] +** (A) N = yy_action[ yy_shift_ofst[S] + X ] +** (B) N = yy_default[S] ** -** If the index value yy_shift_ofst[S]+X is out of range or if the value -** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X or if yy_shift_ofst[S] -** is equal to YY_SHIFT_USE_DFLT, it means that the action is not in the table -** and that yy_default[S] should be used instead. +** The (A) formula is preferred. The B formula is used instead if: +** (1) The yy_shift_ofst[S]+X value is out of range, or +** (2) yy_lookahead[yy_shift_ofst[S]+X] is not equal to X, or +** (3) yy_shift_ofst[S] equal YY_SHIFT_USE_DFLT. +** (Implementation note: YY_SHIFT_USE_DFLT is chosen so that +** YY_SHIFT_USE_DFLT+X will be out of range for all possible lookaheads X. +** Hence only tests (1) and (2) need to be evaluated.) ** -** The formula above is for computing the action when the lookahead is +** The formulas above are for computing the action when the lookahead is ** a terminal symbol. If the lookahead is a non-terminal (as occurs after ** a reduce action) then the yy_reduce_ofst[] array is used in place of ** the yy_shift_ofst[] array and YY_REDUCE_USE_DFLT is used in place of @@ -213,9 +216,9 @@ typedef struct yyStackEntry yyStackEntry; /* The state of the parser is completely contained in an instance of ** the following structure */ struct yyParser { - int yyidx; /* Index of top element in stack */ + yyStackEntry *yytos; /* Pointer to top element of the stack */ #ifdef YYTRACKMAXSTACKDEPTH - int yyidxMax; /* Maximum value of yyidx */ + int yyhwm; /* High-water mark of the stack */ #endif #ifndef YYNOERRORRECOVERY int yyerrcnt; /* Shifts left before out of the error */ @@ -224,6 +227,7 @@ struct yyParser { #if YYSTACKDEPTH<=0 int yystksz; /* Current side of the stack */ yyStackEntry *yystack; /* The parser's stack */ + yyStackEntry yystk0; /* First stack entry */ #else yyStackEntry yystack[YYSTACKDEPTH]; /* The parser's stack */ #endif @@ -278,26 +282,37 @@ static const char *const yyRuleName[] = { }; #endif /* NDEBUG */ + #if YYSTACKDEPTH<=0 /* -** Try to increase the size of the parser stack. +** Try to increase the size of the parser stack. Return the number +** of errors. Return 0 on success. */ -static void yyGrowStack(yyParser *p){ +static int yyGrowStack(yyParser *p){ int newSize; + int idx; yyStackEntry *pNew; newSize = p->yystksz*2 + 100; - pNew = realloc(p->yystack, newSize*sizeof(pNew[0])); + idx = p->yytos ? (int)(p->yytos - p->yystack) : 0; + if( p->yystack==&p->yystk0 ){ + pNew = malloc(newSize*sizeof(pNew[0])); + if( pNew ) pNew[0] = p->yystk0; + }else{ + pNew = realloc(p->yystack, newSize*sizeof(pNew[0])); + } if( pNew ){ p->yystack = pNew; - p->yystksz = newSize; + p->yytos = &p->yystack[idx]; #ifndef NDEBUG if( yyTraceFILE ){ - fprintf(yyTraceFILE,"%sStack grows to %d entries!\n", - yyTracePrompt, p->yystksz); + fprintf(yyTraceFILE,"%sStack grows from %d to %d entries.\n", + yyTracePrompt, p->yystksz, newSize); } #endif + p->yystksz = newSize; } + return pNew==0; } #endif @@ -326,15 +341,24 @@ void *ParseAlloc(void *(CDECL *mallocProc)(YYMALLOCARGTYPE)){ yyParser *pParser; pParser = (yyParser*)(*mallocProc)( (YYMALLOCARGTYPE)sizeof(yyParser) ); if( pParser ){ - pParser->yyidx = -1; #ifdef YYTRACKMAXSTACKDEPTH - pParser->yyidxMax = 0; + pParser->yyhwm = 0; #endif #if YYSTACKDEPTH<=0 + pParser->yytos = NULL; pParser->yystack = NULL; pParser->yystksz = 0; - yyGrowStack(pParser); + if( yyGrowStack(pParser) ){ + pParser->yystack = &pParser->yystk0; + pParser->yystksz = 1; + } #endif +#ifndef YYNOERRORRECOVERY + pParser->yyerrcnt = -1; +#endif + pParser->yytos = pParser->yystack; + pParser->yystack[0].stateno = 0; + pParser->yystack[0].major = 0; } return pParser; } @@ -378,8 +402,9 @@ static void yy_destructor( */ static void yy_pop_parser_stack(yyParser *pParser){ yyStackEntry *yytos; - assert( pParser->yyidx>=0 ); - yytos = &pParser->yystack[pParser->yyidx--]; + assert( pParser->yytos!=0 ); + assert( pParser->yytos > pParser->yystack ); + yytos = pParser->yytos--; #ifndef NDEBUG if( yyTraceFILE ){ fprintf(yyTraceFILE,"%sPopping %s\n", @@ -390,10 +415,10 @@ static void yy_pop_parser_stack(yyParser *pParser){ yy_destructor(pParser, yytos->major, &yytos->minor); } -/* +/* ** Deallocate and destroy a parser. Destructors are called for ** all stack elements before shutting the parser down. -* +** ** If the YYPARSEFREENEVERNULL macro exists (for example because it ** is defined in a %include section of the input grammar) then it is ** assumed that the input pointer is never NULL. @@ -406,9 +431,9 @@ void ParseFree( #ifndef YYPARSEFREENEVERNULL if( pParser==0 ) return; #endif - while( pParser->yyidx>=0 ) yy_pop_parser_stack(pParser); + while( pParser->yytos>pParser->yystack ) yy_pop_parser_stack(pParser); #if YYSTACKDEPTH<=0 - free(pParser->yystack); + if( pParser->yystack!=&pParser->yystk0 ) free(pParser->yystack); #endif (*freeProc)((void*)pParser); } @@ -419,7 +444,7 @@ void ParseFree( #ifdef YYTRACKMAXSTACKDEPTH int ParseStackPeak(void *p){ yyParser *pParser = (yyParser*)p; - return pParser->yyidxMax; + return pParser->yyhwm; } #endif @@ -432,56 +457,53 @@ static unsigned int yy_find_shift_action( YYCODETYPE iLookAhead /* The look-ahead token */ ){ int i; - int stateno = pParser->yystack[pParser->yyidx].stateno; + int stateno = pParser->yytos->stateno; if( stateno>=YY_MIN_REDUCE ) return stateno; assert( stateno <= YY_SHIFT_COUNT ); do{ i = yy_shift_ofst[stateno]; - if( i==YY_SHIFT_USE_DFLT ) return yy_default[stateno]; assert( iLookAhead!=YYNOCODE ); i += iLookAhead; if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){ - if( iLookAhead>0 ){ #ifdef YYFALLBACK - YYCODETYPE iFallback; /* Fallback token */ - if( iLookAhead %s\n", - yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]); - } -#endif - assert( yyFallback[iFallback]==0 ); /* Fallback loop must terminate */ - iLookAhead = iFallback; - continue; + if( yyTraceFILE ){ + fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n", + yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]); } +#endif + assert( yyFallback[iFallback]==0 ); /* Fallback loop must terminate */ + iLookAhead = iFallback; + continue; + } #endif #ifdef YYWILDCARD - { - int j = i - iLookAhead + YYWILDCARD; - if( + { + int j = i - iLookAhead + YYWILDCARD; + if( #if YY_SHIFT_MIN+YYWILDCARD<0 - j>=0 && + j>=0 && #endif #if YY_SHIFT_MAX+YYWILDCARD>=YY_ACTTAB_COUNT - j0 + ){ #ifndef NDEBUG - if( yyTraceFILE ){ - fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n", - yyTracePrompt, yyTokenName[iLookAhead], - yyTokenName[YYWILDCARD]); - } -#endif /* NDEBUG */ - return yy_action[j]; + if( yyTraceFILE ){ + fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n", + yyTracePrompt, yyTokenName[iLookAhead], + yyTokenName[YYWILDCARD]); } +#endif /* NDEBUG */ + return yy_action[j]; } -#endif /* YYWILDCARD */ } +#endif /* YYWILDCARD */ return yy_default[stateno]; }else{ return yy_action[i]; @@ -500,7 +522,7 @@ static int yy_find_reduce_action( int i; #ifdef YYERRORSYMBOL if( stateno>YY_REDUCE_COUNT ){ - return yy_default[stateno]; + return yy_default[stateno]; } #else assert( stateno<=YY_REDUCE_COUNT ); @@ -525,15 +547,15 @@ static int yy_find_reduce_action( */ static void yyStackOverflow(yyParser *yypParser){ ParseARG_FETCH; - yypParser->yyidx--; + yypParser->yytos--; #ifndef NDEBUG if( yyTraceFILE ){ fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt); } #endif - while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser); + while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser); /* Here code is inserted which will execute if the parser - ** stack ever overflows */ + ** stack every overflows */ /******** Begin %stack_overflow code ******************************************/ %% /******** End %stack_overflow code ********************************************/ @@ -548,11 +570,11 @@ static void yyTraceShift(yyParser *yypParser, int yyNewState){ if( yyTraceFILE ){ if( yyNewStateyystack[yypParser->yyidx].major], + yyTracePrompt,yyTokenName[yypParser->yytos->major], yyNewState); }else{ fprintf(yyTraceFILE,"%sShift '%s'\n", - yyTracePrompt,yyTokenName[yypParser->yystack[yypParser->yyidx].major]); + yyTracePrompt,yyTokenName[yypParser->yytos->major]); } } } @@ -570,27 +592,30 @@ static void yy_shift( ParseTOKENTYPE yyMinor /* The minor token to shift in */ ){ yyStackEntry *yytos; - yypParser->yyidx++; + yypParser->yytos++; #ifdef YYTRACKMAXSTACKDEPTH - if( yypParser->yyidx>yypParser->yyidxMax ){ - yypParser->yyidxMax = yypParser->yyidx; + if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){ + yypParser->yyhwm++; + assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack) ); } #endif -#if YYSTACKDEPTH>0 - if( yypParser->yyidx>=YYSTACKDEPTH ){ +#if YYSTACKDEPTH>0 + if( yypParser->yytos>=&yypParser->yystack[YYSTACKDEPTH] ){ yyStackOverflow(yypParser); return; } #else - if( yypParser->yyidx>=yypParser->yystksz ){ - yyGrowStack(yypParser); - if( yypParser->yyidx>=yypParser->yystksz ){ + if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz] ){ + if( yyGrowStack(yypParser) ){ yyStackOverflow(yypParser); return; } } #endif - yytos = &yypParser->yystack[yypParser->yyidx]; + if( yyNewState > YY_MAX_SHIFT ){ + yyNewState += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE; + } + yytos = yypParser->yytos; yytos->stateno = (YYACTIONTYPE)yyNewState; yytos->major = (YYCODETYPE)yyMajor; yytos->minor.yy0 = yyMinor; @@ -622,7 +647,7 @@ static void yy_reduce( yyStackEntry *yymsp; /* The top of the parser's stack */ int yysize; /* Amount to pop the stack */ ParseARG_FETCH; - yymsp = &yypParser->yystack[yypParser->yyidx]; + yymsp = yypParser->yytos; #ifndef NDEBUG if( yyTraceFILE && yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) ){ yysize = yyRuleInfo[yyruleno].nrhs; @@ -636,22 +661,23 @@ static void yy_reduce( ** enough on the stack to push the LHS value */ if( yyRuleInfo[yyruleno].nrhs==0 ){ #ifdef YYTRACKMAXSTACKDEPTH - if( yypParser->yyidx>yypParser->yyidxMax ){ - yypParser->yyidxMax = yypParser->yyidx; + if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){ + yypParser->yyhwm++; + assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack)); } #endif -#if YYSTACKDEPTH>0 - if( yypParser->yyidx>=YYSTACKDEPTH-1 ){ +#if YYSTACKDEPTH>0 + if( yypParser->yytos>=&yypParser->yystack[YYSTACKDEPTH-1] ){ yyStackOverflow(yypParser); return; } #else - if( yypParser->yyidx>=yypParser->yystksz-1 ){ - yyGrowStack(yypParser); - if( yypParser->yyidx>=yypParser->yystksz-1 ){ + if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz-1] ){ + if( yyGrowStack(yypParser) ){ yyStackOverflow(yypParser); return; } + yymsp = yypParser->yytos; } #endif } @@ -674,15 +700,17 @@ static void yy_reduce( yysize = yyRuleInfo[yyruleno].nrhs; yyact = yy_find_reduce_action(yymsp[-yysize].stateno,(YYCODETYPE)yygoto); if( yyact <= YY_MAX_SHIFTREDUCE ){ - if( yyact>YY_MAX_SHIFT ) yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE; - yypParser->yyidx -= yysize - 1; + if( yyact>YY_MAX_SHIFT ){ + yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE; + } yymsp -= yysize-1; + yypParser->yytos = yymsp; yymsp->stateno = (YYACTIONTYPE)yyact; yymsp->major = (YYCODETYPE)yygoto; yyTraceShift(yypParser, yyact); }else{ assert( yyact == YY_ACCEPT_ACTION ); - yypParser->yyidx -= yysize; + yypParser->yytos -= yysize; yy_accept(yypParser); } } @@ -700,7 +728,7 @@ static void yy_parse_failed( fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt); } #endif - while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser); + while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser); /* Here code is inserted which will be executed whenever the ** parser fails */ /************ Begin %parse_failure code ***************************************/ @@ -738,7 +766,10 @@ static void yy_accept( fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt); } #endif - while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser); +#ifndef YYNOERRORRECOVERY + yypParser->yyerrcnt = -1; +#endif + assert( yypParser->yytos==yypParser->yystack ); /* Here code is inserted which will be executed whenever the ** parser accepts */ /*********** Begin %parse_accept code *****************************************/ @@ -782,28 +813,8 @@ void Parse( #endif yyParser *yypParser; /* The parser */ - /* (re)initialize the parser, if necessary */ yypParser = (yyParser*)yyp; - if( yypParser->yyidx<0 ){ -#if YYSTACKDEPTH<=0 - if( yypParser->yystksz <=0 ){ - yyStackOverflow(yypParser); - return; - } -#endif - yypParser->yyidx = 0; -#ifndef YYNOERRORRECOVERY - yypParser->yyerrcnt = -1; -#endif - yypParser->yystack[0].stateno = 0; - yypParser->yystack[0].major = 0; -#ifndef NDEBUG - if( yyTraceFILE ){ - fprintf(yyTraceFILE,"%sInitialize. Empty stack. State 0\n", - yyTracePrompt); - } -#endif - } + assert( yypParser->yytos!=0 ); #if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY) yyendofinput = (yymajor==0); #endif @@ -818,7 +829,6 @@ void Parse( do{ yyact = yy_find_shift_action(yypParser,(YYCODETYPE)yymajor); if( yyact <= YY_MAX_SHIFTREDUCE ){ - if( yyact > YY_MAX_SHIFT ) yyact += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE; yy_shift(yypParser,yyact,yymajor,yyminor); #ifndef YYNOERRORRECOVERY yypParser->yyerrcnt--; @@ -827,11 +837,11 @@ void Parse( }else if( yyact <= YY_MAX_REDUCE ){ yy_reduce(yypParser,yyact-YY_MIN_REDUCE); }else{ + assert( yyact == YY_ERROR_ACTION ); + yyminorunion.yy0 = yyminor; #ifdef YYERRORSYMBOL int yymx; #endif - assert( yyact == YY_ERROR_ACTION ); - yyminorunion.yy0 = yyminor; #ifndef NDEBUG if( yyTraceFILE ){ fprintf(yyTraceFILE,"%sSyntax Error!\n",yyTracePrompt); @@ -840,7 +850,7 @@ void Parse( #ifdef YYERRORSYMBOL /* A syntax error has occurred. ** The response to an error depends upon whether or not the - ** grammar defines an error token "ERROR". + ** grammar defines an error token "ERROR". ** ** This is what we do if the grammar does define ERROR: ** @@ -860,7 +870,7 @@ void Parse( if( yypParser->yyerrcnt<0 ){ yy_syntax_error(yypParser,yymajor,yyminor); } - yymx = yypParser->yystack[yypParser->yyidx].major; + yymx = yypParser->yytos->major; if( yymx==YYERRORSYMBOL || yyerrorhit ){ #ifndef NDEBUG if( yyTraceFILE ){ @@ -871,18 +881,20 @@ void Parse( yy_destructor(yypParser, (YYCODETYPE)yymajor, &yyminorunion); yymajor = YYNOCODE; }else{ - while( - yypParser->yyidx >= 0 && - yymx != YYERRORSYMBOL && - (yyact = yy_find_reduce_action( - yypParser->yystack[yypParser->yyidx].stateno, + while( yypParser->yytos >= yypParser->yystack + && yymx != YYERRORSYMBOL + && (yyact = yy_find_reduce_action( + yypParser->yytos->stateno, YYERRORSYMBOL)) >= YY_MIN_REDUCE ){ yy_pop_parser_stack(yypParser); } - if( yypParser->yyidx < 0 || yymajor==0 ){ + if( yypParser->yytos < yypParser->yystack || yymajor==0 ){ yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion); yy_parse_failed(yypParser); +#ifndef YYNOERRORRECOVERY + yypParser->yyerrcnt = -1; +#endif yymajor = YYNOCODE; }else if( yymx!=YYERRORSYMBOL ){ yy_shift(yypParser,yyact,YYERRORSYMBOL,yyminor); @@ -901,7 +913,7 @@ void Parse( yy_syntax_error(yypParser,yymajor, yyminor); yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion); yymajor = YYNOCODE; - + #else /* YYERRORSYMBOL is not defined */ /* This is what we do if the grammar does not define ERROR: ** @@ -919,18 +931,23 @@ void Parse( yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion); if( yyendofinput ){ yy_parse_failed(yypParser); +#ifndef YYNOERRORRECOVERY + yypParser->yyerrcnt = -1; +#endif } yymajor = YYNOCODE; #endif } - }while( yymajor!=YYNOCODE && yypParser->yyidx>=0 ); + }while( yymajor!=YYNOCODE && yypParser->yytos>yypParser->yystack ); #ifndef NDEBUG if( yyTraceFILE ){ - int i; + yyStackEntry *i; + char cDiv = '['; fprintf(yyTraceFILE,"%sReturn. Stack=",yyTracePrompt); - for(i=1; i<=yypParser->yyidx; i++) - fprintf(yyTraceFILE,"%c%s", i==1 ? '[' : ' ', - yyTokenName[yypParser->yystack[i].major]); + for(i=&yypParser->yystack[1]; i<=yypParser->yytos; i++){ + fprintf(yyTraceFILE,"%c%s", cDiv, yyTokenName[i->major]); + cDiv = ' '; + } fprintf(yyTraceFILE,"]\n"); } #endif