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Lemon update 2016-02-17 12:34:03 on branch parser-performance

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- More agressive use of /*A-overwrites-X*/ in the parser. Fix an off-by-one error in parser stack overflow detection. (user: drh)
This commit is contained in:
Randy Heit 2016-03-20 10:58:56 -05:00
parent 25972d79a7
commit 4a24f7adcf
2 changed files with 11 additions and 4 deletions
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9
tools/lemon/lemon.c
View file

@ -3412,6 +3412,7 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
char *cp, *xp; char *cp, *xp;
int i; int i;
int rc = 0; /* True if yylhsminor is used */ int rc = 0; /* True if yylhsminor is used */
int dontUseRhs0 = 0; /* If true, use of left-most RHS label is illegal */
const char *zSkip = 0; /* The zOvwrt comment within rp->code, or NULL */ const char *zSkip = 0; /* The zOvwrt comment within rp->code, or NULL */
char lhsused = 0; /* True if the LHS element has been used */ char lhsused = 0; /* True if the LHS element has been used */
char lhsdirect; /* True if LHS writes directly into stack */ char lhsdirect; /* True if LHS writes directly into stack */
@ -3482,6 +3483,7 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
if( cp==zSkip ){ if( cp==zSkip ){
append_str(zOvwrt,0,0,0,0); append_str(zOvwrt,0,0,0,0);
cp += lemonStrlen(zOvwrt)-1; cp += lemonStrlen(zOvwrt)-1;
dontUseRhs0 = 1;
continue; continue;
} }
if( ISALPHA(*cp) && (cp==rp->code || (!ISALNUM(cp[-1]) && cp[-1]!='_')) ){ if( ISALPHA(*cp) && (cp==rp->code || (!ISALNUM(cp[-1]) && cp[-1]!='_')) ){
@ -3496,7 +3498,12 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
}else{ }else{
for(i=0; i<rp->nrhs; i++){ for(i=0; i<rp->nrhs; i++){
if( rp->rhsalias[i] && strcmp(cp,rp->rhsalias[i])==0 ){ if( rp->rhsalias[i] && strcmp(cp,rp->rhsalias[i])==0 ){
if( cp!=rp->code && cp[-1]=='@' ){ if( i==0 && dontUseRhs0 ){
ErrorMsg(lemp->filename,rp->ruleline,
"Label %s used after '%s'.",
rp->rhsalias[0], zOvwrt);
lemp->errorcnt++;
}else if( cp!=rp->code && cp[-1]=='@' ){
/* If the argument is of the form @X then substituted /* If the argument is of the form @X then substituted
** the token number of X, not the value of X */ ** the token number of X, not the value of X */
append_str("yymsp[%d].major",-1,i-rp->nrhs+1,0,0); append_str("yymsp[%d].major",-1,i-rp->nrhs+1,0,0);

6
tools/lemon/lempar.c
View file

@ -646,14 +646,14 @@ static void yy_reduce(
} }
#endif #endif
#if YYSTACKDEPTH>0 #if YYSTACKDEPTH>0
if( yypParser->yyidx>=YYSTACKDEPTH ){ if( yypParser->yyidx>=YYSTACKDEPTH-1 ){
yyStackOverflow(yypParser); yyStackOverflow(yypParser);
return; return;
} }
#else #else
if( yypParser->yyidx>=yypParser->yystksz ){ if( yypParser->yyidx>=yypParser->yystksz-1 ){
yyGrowStack(yypParser); yyGrowStack(yypParser);
if( yypParser->yyidx>=yypParser->yystksz ){ if( yypParser->yyidx>=yypParser->yystksz-1 ){
yyStackOverflow(yypParser); yyStackOverflow(yypParser);
return; return;
} }