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Forgot to update lempar.c with lemon.c, so here is version 1.23 from the SQLite CVS.

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SVN r468 (trunk)
This commit is contained in:
Randy Heit 2007-01-30 20:33:57 +00:00
parent b06f4423b9
commit 323034af74
1 changed files with 735 additions and 717 deletions
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54
tools/lemon/lempar.c
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@ -1,12 +1,9 @@
/* Driver template for the LEMON parser generator. /* Driver template for the LEMON parser generator.
** The author disclaims copyright to this source code. ** The author disclaims copyright to this source code.
*/ */
/* First off, code is include which follows the "include" declaration /* First off, code is included which follows the "include" declaration
** in the input file. */ ** in the input file. */
#include <stdio.h> #include <stdio.h>
#ifndef NDEBUG
#include <string.h>
#endif
%% %%
/* Next is all token values, in a form suitable for use by makeheaders. /* Next is all token values, in a form suitable for use by makeheaders.
** This section will be null unless lemon is run with the -m switch. ** This section will be null unless lemon is run with the -m switch.
@ -110,7 +107,7 @@
** yy_default[] Default action for each state. ** yy_default[] Default action for each state.
*/ */
%% %%
#define YY_SZ_ACTTAB (sizeof(yy_action)/sizeof(yy_action[0])) #define YY_SZ_ACTTAB (int)(sizeof(yy_action)/sizeof(yy_action[0]))
/* The next table maps tokens into fallback tokens. If a construct /* The next table maps tokens into fallback tokens. If a construct
** like the following: ** like the following:
@ -324,7 +321,7 @@ void ParseFree(
*/ */
static int yy_find_shift_action( static int yy_find_shift_action(
yyParser *pParser, /* The parser */ yyParser *pParser, /* The parser */
int iLookAhead /* The look-ahead token */ YYCODETYPE iLookAhead /* The look-ahead token */
){ ){
int i; int i;
int stateno = pParser->yystack[pParser->yyidx].stateno; int stateno = pParser->yystack[pParser->yyidx].stateno;
@ -337,19 +334,35 @@ static int yy_find_shift_action(
} }
i += iLookAhead; i += iLookAhead;
if( i<0 || i>=YY_SZ_ACTTAB || yy_lookahead[i]!=iLookAhead ){ if( i<0 || i>=YY_SZ_ACTTAB || yy_lookahead[i]!=iLookAhead ){
if( iLookAhead>0 ){
#ifdef YYFALLBACK #ifdef YYFALLBACK
int iFallback; /* Fallback token */ int iFallback; /* Fallback token */
if( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0]) if( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0])
&& (iFallback = yyFallback[iLookAhead])!=0 ){ && (iFallback = yyFallback[iLookAhead])!=0 ){
#ifndef NDEBUG #ifndef NDEBUG
if( yyTraceFILE ){ if( yyTraceFILE ){
fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n", fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]); yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
}
#endif
return yy_find_shift_action(pParser, iFallback);
} }
#endif #endif
return yy_find_shift_action(pParser, iFallback); #ifdef YYWILDCARD
{
int j = i - iLookAhead + YYWILDCARD;
if( j>=0 && j<YY_SZ_ACTTAB && yy_lookahead[j]==YYWILDCARD ){
#ifndef NDEBUG
if( yyTraceFILE ){
fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[YYWILDCARD]);
}
#endif /* NDEBUG */
return yy_action[j];
}
}
#endif /* YYWILDCARD */
} }
#endif
return yy_default[stateno]; return yy_default[stateno];
}else{ }else{
return yy_action[i]; return yy_action[i];
@ -366,7 +379,7 @@ static int yy_find_shift_action(
*/ */
static int yy_find_reduce_action( static int yy_find_reduce_action(
int stateno, /* Current state number */ int stateno, /* Current state number */
int iLookAhead /* The look-ahead token */ YYCODETYPE iLookAhead /* The look-ahead token */
){ ){
int i; int i;
/* int stateno = pParser->yystack[pParser->yyidx].stateno; */ /* int stateno = pParser->yystack[pParser->yyidx].stateno; */
@ -457,13 +470,12 @@ static void yy_reduce(
yymsp = &yypParser->yystack[yypParser->yyidx]; yymsp = &yypParser->yystack[yypParser->yyidx];
#ifndef NDEBUG #ifndef NDEBUG
if( yyTraceFILE && yyruleno>=0 if( yyTraceFILE && yyruleno>=0
&& yyruleno<sizeof(yyRuleName)/sizeof(yyRuleName[0]) ){ && yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) ){
fprintf(yyTraceFILE, "%sReduce [%s].\n", yyTracePrompt, fprintf(yyTraceFILE, "%sReduce [%s].\n", yyTracePrompt,
yyRuleName[yyruleno]); yyRuleName[yyruleno]);
} }
#endif /* NDEBUG */ #endif /* NDEBUG */
#ifndef NDEBUG
/* Silence complaints from purify about yygotominor being uninitialized /* Silence complaints from purify about yygotominor being uninitialized
** in some cases when it is copied into the stack after the following ** in some cases when it is copied into the stack after the following
** switch. yygotominor is uninitialized when a rule reduces that does ** switch. yygotominor is uninitialized when a rule reduces that does
@ -471,9 +483,15 @@ static void yy_reduce(
** value of the nonterminal uninitialized is utterly harmless as long ** value of the nonterminal uninitialized is utterly harmless as long
** as the value is never used. So really the only thing this code ** as the value is never used. So really the only thing this code
** accomplishes is to quieten purify. ** accomplishes is to quieten purify.
**
** 2007-01-16: The wireshark project (www.wireshark.org) reports that
** without this code, their parser segfaults. I'm not sure what there
** parser is doing to make this happen. This is the second bug report
** from wireshark this week. Clearly they are stressing Lemon in ways
** that it has not been previously stressed... (SQLite ticket #2172)
*/ */
memset(&yygotominor, 0, sizeof(yygotominor)); memset(&yygotominor, 0, sizeof(yygotominor));
#endif
switch( yyruleno ){ switch( yyruleno ){
/* Beginning here are the reduction cases. A typical example /* Beginning here are the reduction cases. A typical example