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Overview
| Comment: | Change lemon so that it does not generate yytestcase() macros on destructor cases since destructors are commonly unreachable in a reasonable grammar. For the reduce-rule switch, gather all no-ops into the "default:" case. (CVS 6757) |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
caebfe82cb1b1215a85ed48fe97360c5 |
| User & Date: | drh 2009-06-12 17:46:20.000 |
Context
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2009-06-14
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| 12:47 | Detect database corruption and abort balance_nonroot() before the corruption causes problems. (CVS 6758) (check-in: 3448b39dcd user: drh tags: trunk) | |
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2009-06-12
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| 17:46 | Change lemon so that it does not generate yytestcase() macros on destructor cases since destructors are commonly unreachable in a reasonable grammar. For the reduce-rule switch, gather all no-ops into the "default:" case. (CVS 6757) (check-in: caebfe82cb user: drh tags: trunk) | |
| 15:47 | The previous check-in ((6755)) put in more yytestcase() macros than are called for. This check-in addresses that problem. (CVS 6756) (check-in: a5b182f93b user: drh tags: trunk) | |
Changes
Changes to tool/lemon.c.
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3858 3859 3860 3861 3862 3863 3864 |
if( lemp->tokendest ){
int once = 1;
for(i=0; i<lemp->nsymbol; i++){
struct symbol *sp = lemp->symbols[i];
if( sp==0 || sp->type!=TERMINAL ) continue;
if( once ){
fprintf(out, " /* TERMINAL Destructor */\n"); lineno++;
| < < < < > < < < < < > | | | 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 |
if( lemp->tokendest ){
int once = 1;
for(i=0; i<lemp->nsymbol; i++){
struct symbol *sp = lemp->symbols[i];
if( sp==0 || sp->type!=TERMINAL ) continue;
if( once ){
fprintf(out, " /* TERMINAL Destructor */\n"); lineno++;
once = 0;
}
fprintf(out," case %d: /* %s */\n", sp->index, sp->name); lineno++;
}
for(i=0; i<lemp->nsymbol && lemp->symbols[i]->type!=TERMINAL; i++);
if( i<lemp->nsymbol ){
emit_destructor_code(out,lemp->symbols[i],lemp,&lineno);
fprintf(out," break;\n"); lineno++;
}
}
if( lemp->vardest ){
struct symbol *dflt_sp = 0;
int once = 1;
for(i=0; i<lemp->nsymbol; i++){
struct symbol *sp = lemp->symbols[i];
if( sp==0 || sp->type==TERMINAL ||
sp->index<=0 || sp->destructor!=0 ) continue;
if( once ){
fprintf(out, " /* Default NON-TERMINAL Destructor */\n"); lineno++;
once = 0;
}
fprintf(out," case %d: /* %s */\n", sp->index, sp->name); lineno++;
dflt_sp = sp;
}
if( dflt_sp!=0 ){
emit_destructor_code(out,dflt_sp,lemp,&lineno);
}
fprintf(out," break;\n"); lineno++;
}
for(i=0; i<lemp->nsymbol; i++){
struct symbol *sp = lemp->symbols[i];
if( sp==0 || sp->type==TERMINAL || sp->destructor==0 ) continue;
fprintf(out," case %d: /* %s */\n", sp->index, sp->name); lineno++;
/* Combine duplicate destructors into a single case */
for(j=i+1; j<lemp->nsymbol; j++){
struct symbol *sp2 = lemp->symbols[j];
if( sp2 && sp2->type!=TERMINAL && sp2->destructor
&& sp2->dtnum==sp->dtnum
&& strcmp(sp->destructor,sp2->destructor)==0 ){
fprintf(out," case %d: /* %s */\n",
sp2->index, sp2->name); lineno++;
sp2->destructor = 0;
}
}
emit_destructor_code(out,lemp->symbols[i],lemp,&lineno);
fprintf(out," break;\n"); lineno++;
}
|
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3934 3935 3936 3937 3938 3939 3940 3941 |
}
tplt_xfer(lemp->name,in,out,&lineno);
/* Generate code which execution during each REDUCE action */
for(rp=lemp->rule; rp; rp=rp->next){
translate_code(lemp, rp);
}
for(rp=lemp->rule; rp; rp=rp->next){
| > | > > > > > > > > > > > > > | 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 |
}
tplt_xfer(lemp->name,in,out,&lineno);
/* Generate code which execution during each REDUCE action */
for(rp=lemp->rule; rp; rp=rp->next){
translate_code(lemp, rp);
}
/* First output rules other than the default: rule */
for(rp=lemp->rule; rp; rp=rp->next){
struct rule *rp2; /* Other rules with the same action */
if( rp->code==0 ) continue;
if( rp->code[0]=='\n' && rp->code[1]==0 ) continue; /* Will be default: */
fprintf(out," case %d: /* ", rp->index);
writeRuleText(out, rp);
fprintf(out, " */\n"); lineno++;
for(rp2=rp->next; rp2; rp2=rp2->next){
if( rp2->code==rp->code ){
fprintf(out," case %d: /* ", rp2->index);
writeRuleText(out, rp2);
fprintf(out," */ yytestcase(yyruleno==%d);\n", rp2->index); lineno++;
rp2->code = 0;
}
}
emit_code(out,rp,lemp,&lineno);
fprintf(out," break;\n"); lineno++;
rp->code = 0;
}
/* Finally, output the default: rule. We choose as the default: all
** empty actions. */
fprintf(out," default:\n"); lineno++;
for(rp=lemp->rule; rp; rp=rp->next){
if( rp->code==0 ) continue;
assert( rp->code[0]=='\n' && rp->code[1]==0 );
fprintf(out," /* (%d) ", rp->index);
writeRuleText(out, rp);
fprintf(out, " */ yytestcase(yyruleno==%d);\n", rp->index); lineno++;
}
fprintf(out," break;\n"); lineno++;
tplt_xfer(lemp->name,in,out,&lineno);
/* Generate code which executes if a parse fails */
tplt_print(out,lemp,lemp->failure,&lineno);
tplt_xfer(lemp->name,in,out,&lineno);
/* Generate code which executes when a syntax error occurs */
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