-/* Allocate input grammar variables for bison,
+/* Allocate input grammar variables for Bison.
+
Copyright (C) 1984, 1986, 1989, 2001, 2002 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include "system.h"
-#include "quotearg.h"
-#include "symtab.h"
+
+#include <quotearg.h>
+
#include "gram.h"
-#include "reduce.h"
#include "reader.h"
+#include "reduce.h"
+#include "symtab.h"
/* Comments for these variables are in gram.h. */
-item_number_t *ritem = NULL;
+item_number *ritem = NULL;
unsigned int nritems = 0;
-rule_t *rules = NULL;
-rule_number_t nrules = 0;
+rule *rules = NULL;
+rule_number nrules = 0;
-symbol_t **symbols = NULL;
+symbol **symbols = NULL;
int nsyms = 0;
int ntokens = 1;
int nvars = 0;
-symbol_number_t *token_translations = NULL;
+symbol_number *token_translations = NULL;
int max_user_token_number = 256;
int pure_parser = 0;
+/*--------------------------------------------------------------.
+| Return true IFF the rule has a `number' smaller than NRULES. |
+`--------------------------------------------------------------*/
+
+bool
+rule_useful_p (rule *r)
+{
+ return r->number < nrules;
+}
+
+
+/*-------------------------------------------------------------.
+| Return true IFF the rule has a `number' higher than NRULES. |
+`-------------------------------------------------------------*/
+
+bool
+rule_useless_p (rule *r)
+{
+ return r->number >= nrules;
+}
+
+
+/*--------------------------------------------------------------------.
+| Return true IFF the rule is not flagged as useful *and* is useful. |
+| In other words, it was discarded because of conflicts. |
+`--------------------------------------------------------------------*/
+
+bool
+rule_never_reduced_p (rule *r)
+{
+ return !r->useful && r->number < nrules;
+}
+
+
+/*----------------------------------------------------------------.
+| Print this RULE's number and lhs on OUT. If a PREVIOUS_LHS was |
+| already displayed (by a previous call for another rule), avoid |
+| useless repetitions. |
+`----------------------------------------------------------------*/
+
+void
+rule_lhs_print (rule *r, symbol *previous_lhs, FILE *out)
+{
+ fprintf (out, " %3d ", r->number);
+ if (previous_lhs != r->lhs)
+ {
+ fprintf (out, "%s:", r->lhs->tag);
+ }
+ else
+ {
+ int n;
+ for (n = strlen (previous_lhs->tag); n > 0; --n)
+ fputc (' ', out);
+ fputc ('|', out);
+ }
+}
+
+
/*--------------------------------------.
| Return the number of symbols in RHS. |
`--------------------------------------*/
int
-rule_rhs_length (rule_t *rule)
+rule_rhs_length (rule *r)
{
int res = 0;
- item_number_t *rhsp;
- for (rhsp = rule->rhs; *rhsp >= 0; ++rhsp)
+ item_number *rhsp;
+ for (rhsp = r->rhs; *rhsp >= 0; ++rhsp)
++res;
return res;
}
/*-------------------------------.
-| Print this RULE's RHS on OUT. |
+| Print this rule's RHS on OUT. |
`-------------------------------*/
void
-rule_rhs_print (rule_t *rule, FILE *out)
+rule_rhs_print (rule *r, FILE *out)
{
- if (*rule->rhs >= 0)
+ if (*r->rhs >= 0)
{
- item_number_t *r;
- for (r = rule->rhs; *r >= 0; r++)
- fprintf (out, " %s", symbol_tag_get (symbols[*r]));
+ item_number *rp;
+ for (rp = r->rhs; *rp >= 0; rp++)
+ fprintf (out, " %s", symbols[*rp]->tag);
fputc ('\n', out);
}
else
/*-------------------------.
-| Print this RULE on OUT. |
+| Print this rule on OUT. |
`-------------------------*/
void
-rule_print (rule_t *rule, FILE *out)
+rule_print (rule *r, FILE *out)
{
- fprintf (out, "%s:", symbol_tag_get (rule->lhs));
- rule_rhs_print (rule, out);
+ fprintf (out, "%s:", r->lhs->tag);
+ rule_rhs_print (r, out);
}
fputs ("RITEM\n", out);
for (i = 0; i < nritems; ++i)
if (ritem[i] >= 0)
- fprintf (out, " %s", symbol_tag_get (symbols[ritem[i]]));
+ fprintf (out, " %s", symbols[ritem[i]]->tag);
else
- fprintf (out, " (rule %d)\n", -ritem[i] - 1);
+ fprintf (out, " (rule %d)\n", item_number_as_rule_number (ritem[i]));
fputs ("\n\n", out);
}
ritem_longest_rhs (void)
{
int max = 0;
- rule_number_t r;
+ rule_number r;
- for (r = 1; r < nrules + 1; ++r)
+ for (r = 0; r < nrules; ++r)
{
int length = rule_rhs_length (&rules[r]);
if (length > max)
}
-/*----------------------------------------------------------------.
-| Print the grammar's rules numbers from BEGIN (inclusive) to END |
-| (exclusive) on OUT under TITLE. |
-`----------------------------------------------------------------*/
-
-static inline void
-blanks_print (unsigned n, FILE *out)
-{
- for (/* Nothing*/; n > 0; --n)
- fputc (' ', out);
-}
+/*-----------------------------------------------------------------.
+| Print the grammar's rules that match FILTER on OUT under TITLE. |
+`-----------------------------------------------------------------*/
void
grammar_rules_partial_print (FILE *out, const char *title,
- rule_number_t begin, rule_number_t end)
+ rule_filter filter)
{
int r;
- symbol_t *last_lhs = NULL;
+ bool first = true;
+ symbol *previous_lhs = NULL;
/* rule # : LHS -> RHS */
- fprintf (out, "%s\n\n", title);
- for (r = begin; r < end; r++)
+ for (r = 0; r < nrules + nuseless_productions; r++)
{
- if (last_lhs && last_lhs != rules[r].lhs)
+ if (filter && !filter (&rules[r]))
+ continue;
+ if (first)
+ fprintf (out, "%s\n\n", title);
+ else if (previous_lhs && previous_lhs != rules[r].lhs)
fputc ('\n', out);
-
- fprintf (out, " %3d ", r - 1);
- if (last_lhs != rules[r].lhs)
- {
- last_lhs = rules[r].lhs;
- fprintf (out, "%s:", symbol_tag_get (last_lhs));
- }
- else
- {
- blanks_print (strlen (symbol_tag_get (last_lhs)), out);
- fputc ('|', out);
- }
+ first = false;
+ rule_lhs_print (&rules[r], previous_lhs, out);
rule_rhs_print (&rules[r], out);
+ previous_lhs = rules[r].lhs;
}
- fputs ("\n\n", out);
+ if (!first)
+ fputs ("\n\n", out);
}
void
grammar_rules_print (FILE *out)
{
- grammar_rules_partial_print (out, _("Grammar"), 1, nrules + 1);
+ grammar_rules_partial_print (out, _("Grammar"), rule_useful_p);
}
fprintf (out, "Variables\n---------\n\n");
{
- symbol_number_t i;
+ symbol_number i;
fprintf (out, "Value Sprec Sassoc Tag\n");
for (i = ntokens; i < nsyms; i++)
fprintf (out, "%5d %5d %5d %s\n",
i,
symbols[i]->prec, symbols[i]->assoc,
- symbol_tag_get (symbols[i]));
+ symbols[i]->tag);
fprintf (out, "\n\n");
}
fprintf (out, "Rules\n-----\n\n");
{
- rule_number_t i;
+ rule_number i;
fprintf (out, "Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n");
- for (i = 1; i < nrules + nuseless_productions + 1; i++)
+ for (i = 0; i < nrules + nuseless_productions; i++)
{
- rule_t *rule = &rules[i];
- item_number_t *r = NULL;
- int rhs_count = 0;
+ rule *rule_i = &rules[i];
+ item_number *r = NULL;
+ unsigned int rhs_itemno = rule_i->rhs - ritem;
+ unsigned int rhs_count = 0;
/* Find the last RHS index in ritems. */
- for (r = rule->rhs; *r >= 0; ++r)
+ for (r = rule_i->rhs; *r >= 0; ++r)
++rhs_count;
- fprintf (out, "%3d (%2d, %2d, %2d, %2d-%2d) %2d ->",
- i - 1,
- rule->prec ? rule->prec->prec : 0,
- rule->prec ? rule->prec->assoc : 0,
- rule->useful,
- rule->rhs - ritem,
- rule->rhs - ritem + rhs_count - 1,
- rule->lhs->number);
+ fprintf (out, "%3d (%2d, %2d, %2d, %2u-%2u) %2d ->",
+ i,
+ rule_i->prec ? rule_i->prec->prec : 0,
+ rule_i->prec ? rule_i->prec->assoc : 0,
+ rule_i->useful,
+ rhs_itemno,
+ rhs_itemno + rhs_count - 1,
+ rule_i->lhs->number);
/* Dumped the RHS. */
- for (r = rule->rhs; *r >= 0; r++)
+ for (r = rule_i->rhs; *r >= 0; r++)
fprintf (out, " %3d", *r);
- fprintf (out, " [%d]\n", -(*r) - 1);
+ fprintf (out, " [%d]\n", item_number_as_rule_number (*r));
}
}
fprintf (out, "\n\n");
fprintf (out, "Rules interpreted\n-----------------\n\n");
{
- rule_number_t r;
- for (r = 1; r < nrules + nuseless_productions + 1; r++)
+ rule_number r;
+ for (r = 0; r < nrules + nuseless_productions; r++)
{
fprintf (out, "%-5d ", r);
rule_print (&rules[r], out);
}
+/*------------------------------------------------------------------.
+| Report on STDERR the rules that are not flagged USEFUL, using the |
+| MESSAGE (which can be `useless rule' when invoked after grammar |
+| reduction, or `never reduced' after conflicts were taken into |
+| account). |
+`------------------------------------------------------------------*/
+
+void
+grammar_rules_never_reduced_report (const char *message)
+{
+ rule_number r;
+ for (r = 0; r < nrules ; ++r)
+ if (!rules[r].useful)
+ {
+ location_print (stderr, rules[r].location);
+ fprintf (stderr, ": %s: %s: ",
+ _("warning"), message);
+ rule_print (&rules[r], stderr);
+ }
+}
+
void
grammar_free (void)
{
XFREE (ritem);
- free (rules + 1);
+ free (rules);
XFREE (token_translations);
/* Free the symbol table data structure. */
symbols_free ();
projects / bison.git / blobdiff