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Lemon update 2016-05-23 14:24:31 on branch trunk
— Fix comment typos and improve clarity of presention in Lemon. The output should be identical. (user: drh)
This commit is contained in:
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45d441f103
commit
0d67d107ab
1 changed files with 29 additions and 22 deletions
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@ -192,6 +192,8 @@ struct rule {
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const char *code; /* The code executed when this rule is reduced */
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const char *code; /* The code executed when this rule is reduced */
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const char *codePrefix; /* Setup code before code[] above */
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const char *codePrefix; /* Setup code before code[] above */
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const char *codeSuffix; /* Breakdown code after code[] above */
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const char *codeSuffix; /* Breakdown code after code[] above */
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int noCode; /* True if this rule has no associated C code */
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int codeEmitted; /* True if the code has been emitted already */
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struct symbol *precsym; /* Precedence symbol for this rule */
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struct symbol *precsym; /* Precedence symbol for this rule */
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int index; /* An index number for this 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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int iRule; /* Rule number as used in the generated tables */
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@ -253,7 +255,7 @@ struct state {
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struct config *bp; /* The basis configurations for this state */
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struct config *bp; /* The basis configurations for this state */
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struct config *cfp; /* All configurations in this set */
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struct config *cfp; /* All configurations in this set */
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int statenum; /* Sequential number for this state */
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int statenum; /* Sequential number for this state */
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struct action *ap; /* Array of actions for this state */
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struct action *ap; /* List of actions for this state */
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int nTknAct, nNtAct; /* Number of actions on terminals and nonterminals */
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int nTknAct, nNtAct; /* Number of actions on terminals and nonterminals */
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int iTknOfst, iNtOfst; /* yy_action[] offset for terminals and nonterms */
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int iTknOfst, iNtOfst; /* yy_action[] offset for terminals and nonterms */
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int iDfltReduce; /* Default action is to REDUCE by this rule */
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int iDfltReduce; /* Default action is to REDUCE by this rule */
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@ -1483,7 +1485,7 @@ static void handle_C_option(char *z){
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}
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}
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}
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}
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/* Merge together to lists of rules order by rule.iRule */
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/* Merge together to lists of rules ordered by rule.iRule */
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static struct rule *Rule_merge(struct rule *pA, struct rule *pB){
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static struct rule *Rule_merge(struct rule *pA, struct rule *pB){
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struct rule *pFirst = 0;
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struct rule *pFirst = 0;
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struct rule **ppPrev = &pFirst;
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struct rule **ppPrev = &pFirst;
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@ -1627,7 +1629,10 @@ int main(int argc, char **argv)
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for(i=1; ISUPPER(lem.symbols[i]->name[0]); i++);
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for(i=1; ISUPPER(lem.symbols[i]->name[0]); i++);
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lem.nterminal = i;
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lem.nterminal = i;
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/* Assign sequential rule numbers */
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/* Assign sequential rule numbers. Start with 0. Put rules that have no
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** reduce action C-code associated with them last, so that the switch()
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** statement that selects reduction actions will have a smaller jump table.
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*/
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for(i=0, rp=lem.rule; rp; rp=rp->next){
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for(i=0, rp=lem.rule; rp; rp=rp->next){
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rp->iRule = rp->code ? i++ : -1;
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rp->iRule = rp->code ? i++ : -1;
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}
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}
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@ -2179,7 +2184,7 @@ static void parseonetoken(struct pstate *psp)
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"There is no prior rule upon which to attach the code \
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"There is no prior rule upon which to attach the code \
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fragment which begins on this line.");
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fragment which begins on this line.");
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psp->errorcnt++;
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psp->errorcnt++;
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}else if( psp->prevrule->code!=0 ){
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}else if( psp->prevrule->code!=0 ){
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ErrorMsg(psp->filename,psp->tokenlineno,
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ErrorMsg(psp->filename,psp->tokenlineno,
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"Code fragment beginning on this line is not the first \
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"Code fragment beginning on this line is not the first \
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to follow the previous rule.");
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to follow the previous rule.");
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@ -2187,7 +2192,8 @@ to follow the previous rule.");
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}else{
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}else{
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psp->prevrule->line = psp->tokenlineno;
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psp->prevrule->line = psp->tokenlineno;
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psp->prevrule->code = &x[1];
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psp->prevrule->code = &x[1];
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}
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psp->prevrule->noCode = 0;
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}
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}else if( x[0]=='[' ){
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}else if( x[0]=='[' ){
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psp->state = PRECEDENCE_MARK_1;
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psp->state = PRECEDENCE_MARK_1;
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}else{
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}else{
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@ -2293,6 +2299,7 @@ to follow the previous rule.");
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rp->lhsalias = psp->lhsalias;
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rp->lhsalias = psp->lhsalias;
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rp->nrhs = psp->nrhs;
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rp->nrhs = psp->nrhs;
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rp->code = 0;
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rp->code = 0;
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rp->noCode = 1;
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rp->precsym = 0;
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rp->precsym = 0;
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rp->index = psp->gp->nrule++;
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rp->index = psp->gp->nrule++;
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rp->nextlhs = rp->lhs->rule;
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rp->nextlhs = rp->lhs->rule;
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@ -3531,9 +3538,8 @@ PRIVATE char *append_str(const char *zText, int n, int p1, int p2, int bNoSubst)
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}
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}
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/*
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/*
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** zCode is a string that is the action associated with a rule. Expand
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** Write and transform the rp->code string so that symbols are expanded.
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** the symbols in this string so that the refer to elements of the parser
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** Populate the rp->codePrefix and rp->codeSuffix strings, as appropriate.
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** stack.
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**
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**
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** Return 1 if the expanded code requires that "yylhsminor" local variable
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** Return 1 if the expanded code requires that "yylhsminor" local variable
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** to be defined.
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** to be defined.
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@ -3557,6 +3563,9 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
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static char newlinestr[2] = { '\n', '\0' };
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static char newlinestr[2] = { '\n', '\0' };
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rp->code = newlinestr;
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rp->code = newlinestr;
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rp->line = rp->ruleline;
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rp->line = rp->ruleline;
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rp->noCode = 1;
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}else{
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rp->noCode = 0;
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}
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}
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if( rp->nrhs==0 ){
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if( rp->nrhs==0 ){
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@ -3571,6 +3580,7 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
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append_str(" yy_destructor(yypParser,%d,&yymsp[%d].minor);\n", 0,
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append_str(" yy_destructor(yypParser,%d,&yymsp[%d].minor);\n", 0,
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rp->rhs[0]->index,1-rp->nrhs,0);
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rp->rhs[0]->index,1-rp->nrhs,0);
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rp->codePrefix = Strsafe(append_str(0,0,0,0,0));
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rp->codePrefix = Strsafe(append_str(0,0,0,0,0));
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rp->noCode = 0;
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}
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}
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}else if( rp->lhsalias==0 ){
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}else if( rp->lhsalias==0 ){
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/* There is no LHS value symbol. */
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/* There is no LHS value symbol. */
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@ -3717,7 +3727,10 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
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/* Suffix code generation complete */
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/* Suffix code generation complete */
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cp = append_str(0,0,0,0,0);
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cp = append_str(0,0,0,0,0);
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if( cp && cp[0] ) rp->codeSuffix = Strsafe(cp);
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if( cp && cp[0] ){
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rp->codeSuffix = Strsafe(cp);
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rp->noCode = 0;
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}
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return rc;
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return rc;
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}
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}
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@ -4398,13 +4411,9 @@ void ReportTable(
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/* First output rules other than the default: rule */
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/* First output rules other than the default: rule */
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for(rp=lemp->rule; rp; rp=rp->next){
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for(rp=lemp->rule; rp; rp=rp->next){
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struct rule *rp2; /* Other rules with the same action */
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struct rule *rp2; /* Other rules with the same action */
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if( rp->code==0 ) continue;
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if( rp->codeEmitted ) continue;
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if( rp->code[0]=='\n'
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if( rp->noCode ){
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&& rp->code[1]==0
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/* No C code actions, so this will be part of the "default:" rule */
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&& rp->codePrefix==0
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&& rp->codeSuffix==0
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){
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/* No actions, so this will be part of the "default:" rule */
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continue;
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continue;
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}
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}
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fprintf(out," case %d: /* ",rp->iRule);
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fprintf(out," case %d: /* ",rp->iRule);
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@ -4416,21 +4425,19 @@ void ReportTable(
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fprintf(out," case %d: /*",rp2->iRule);
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fprintf(out," case %d: /*",rp2->iRule);
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writeRuleText(out, rp2);
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writeRuleText(out, rp2);
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fprintf(out, " */ yytestcase(yyruleno==%d);\n", rp2->iRule); lineno++;
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fprintf(out, " */ yytestcase(yyruleno==%d);\n", rp2->iRule); lineno++;
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rp2->code = 0;
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rp2->codeEmitted = 1;
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}
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}
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}
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}
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emit_code(out,rp,lemp,&lineno);
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emit_code(out,rp,lemp,&lineno);
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fprintf(out," break;\n"); lineno++;
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fprintf(out," break;\n"); lineno++;
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rp->code = 0;
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rp->codeEmitted = 1;
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}
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}
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/* Finally, output the default: rule. We choose as the default: all
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/* Finally, output the default: rule. We choose as the default: all
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** empty actions. */
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** empty actions. */
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fprintf(out," default:\n"); lineno++;
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fprintf(out," default:\n"); lineno++;
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for(rp=lemp->rule; rp; rp=rp->next){
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for(rp=lemp->rule; rp; rp=rp->next){
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if( rp->code==0 ) continue;
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if( rp->codeEmitted ) continue;
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assert( rp->code[0]=='\n' && rp->code[1]==0 );
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assert( rp->noCode );
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assert( rp->codePrefix==0 );
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assert( rp->codeSuffix==0 );
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fprintf(out," /* (%d) ", rp->iRule);
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fprintf(out," /* (%d) ", rp->iRule);
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writeRuleText(out, rp);
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writeRuleText(out, rp);
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fprintf(out," */ yytestcase(yyruleno==%d);\n", rp->iRule); lineno++;
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fprintf(out," */ yytestcase(yyruleno==%d);\n", rp->iRule); lineno++;
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