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Lemon update 2016-02-17 04:33:10 on branch parser-performance
- Enhance Lemon so that if reduce code contains a comment of the form "/*A-overwrites-X*/" then a LHS label A is allowed to overwrite the RHS label X. (user: drh)
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1 changed files with 21 additions and 6 deletions
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@ -3411,11 +3411,13 @@ PRIVATE char *append_str(const char *zText, int n, int p1, int p2, int bNoSubst)
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PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
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char *cp, *xp;
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int i;
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int rc = 0; /* True if yylhsminor is used */
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char lhsused = 0; /* True if the LHS element has been used */
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char lhsdirect; /* True if LHS writes directly into stack */
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char used[MAXRHS]; /* True for each RHS element which is used */
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char zLhs[50]; /* Convert the LHS symbol into this string */
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int rc = 0; /* True if yylhsminor is used */
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const char *zSkip = 0; /* The zOvwrt comment within rp->code, or NULL */
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char lhsused = 0; /* True if the LHS element has been used */
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char lhsdirect; /* True if LHS writes directly into stack */
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char used[MAXRHS]; /* True for each RHS element which is used */
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char zLhs[50]; /* Convert the LHS symbol into this string */
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char zOvwrt[900]; /* Comment that to allow LHS to overwrite RHS */
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for(i=0; i<rp->nrhs; i++) used[i] = 0;
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lhsused = 0;
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@ -3456,7 +3458,15 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
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lemp->errorcnt++;
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}
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}else{
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lhsdirect = 0;
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sprintf(zOvwrt, "/*%s-overwrites-%s*/", rp->lhsalias, rp->rhsalias[0]);
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zSkip = strstr(rp->code, zOvwrt);
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if( zSkip!=0 ){
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/* The code contains a special comment that indicates that it is safe
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** for the LHS label to overwrite left-most RHS label. */
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lhsdirect = 1;
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}else{
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lhsdirect = 0;
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}
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}
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if( lhsdirect ){
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sprintf(zLhs, "yymsp[%d].minor.yy%d",1-rp->nrhs,rp->lhs->dtnum);
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@ -3469,6 +3479,11 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
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/* This const cast is wrong but harmless, if we're careful. */
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for(cp=(char *)rp->code; *cp; cp++){
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if( cp==zSkip ){
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append_str(zOvwrt,0,0,0,0);
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cp += lemonStrlen(zOvwrt)-1;
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continue;
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}
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if( ISALPHA(*cp) && (cp==rp->code || (!ISALNUM(cp[-1]) && cp[-1]!='_')) ){
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char saved;
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for(xp= &cp[1]; ISALNUM(*xp) || *xp=='_'; xp++);
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