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Lemon update 2016-05-24 18:55:08 on branch trunk
— Enhance Lemon and the parser template so that it can once again build parsers that have no unreachable branches. (user: drh)
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1 changed files with 20 additions and 1 deletions
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@ -198,6 +198,7 @@ struct rule {
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int index; /* An index number for this rule */
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int iRule; /* Rule number as used in the generated tables */
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Boolean canReduce; /* True if this rule is ever reduced */
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Boolean doesReduce; /* Reduce actions occur after optimization */
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struct rule *nextlhs; /* Next rule with the same LHS */
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struct rule *next; /* Next rule in the global list */
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};
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@ -4154,6 +4155,19 @@ void ReportTable(
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}
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free(ax);
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/* Mark rules that are actually used for reduce actions after all
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** optimizations have been applied
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*/
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for(rp=lemp->rule; rp; rp=rp->next) rp->doesReduce = LEMON_FALSE;
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for(i=0; i<lemp->nxstate; i++){
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struct action *ap;
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for(ap=lemp->sorted[i]->ap; ap; ap=ap->next){
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if( ap->type==REDUCE || ap->type==SHIFTREDUCE ){
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ap->x.rp->doesReduce = i;
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}
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}
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}
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/* Finish rendering the constants now that the action table has
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** been computed */
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fprintf(out,"#define YYNSTATE %d\n",lemp->nxstate); lineno++;
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@ -4445,7 +4459,12 @@ void ReportTable(
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assert( rp->noCode );
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fprintf(out," /* (%d) ", rp->iRule);
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writeRuleText(out, rp);
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fprintf(out," */ yytestcase(yyruleno==%d);\n", rp->iRule); lineno++;
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if( rp->doesReduce ){
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fprintf(out, " */ yytestcase(yyruleno==%d);\n", rp->iRule); lineno++;
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}else{
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fprintf(out, " (OPTIMIZED OUT) */ assert(yyruleno!=%d);\n",
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rp->iRule); lineno++;
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}
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}
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fprintf(out," break;\n"); lineno++;
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tplt_xfer(lemp->name,in,out,&lineno);
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