(EXTRA_DIST): Avoid +=, a GNU make extension.

[bison.git] / src / gram.c

diff --git a/src/gram.c b/src/gram.c
index c1279282adc8d8f22a0df133a278aa09007c9fab..57e900a19862ae46bda013e29c9f1840bc8c4280 100644 (file)
--- a/src/gram.c
+++ b/src/gram.c
@@ -32,7 +32,7 @@ item_number_t *ritem = NULL;
 unsigned int nritems = 0;
 
 rule_t *rules = NULL;
 unsigned int nritems = 0;
 
 rule_t *rules = NULL;

-int nrules = 0;
+rule_number_t nrules = 0;

 
 symbol_t **symbols = NULL;
 int nsyms = 0;
 
 symbol_t **symbols = NULL;
 int nsyms = 0;


@@ -43,9 +43,68 @@ symbol_number_t *token_translations = NULL;
 
 int max_user_token_number = 256;
 
 
 int max_user_token_number = 256;
 

+int glr_parser = 0;

 int pure_parser = 0;
 
 
 int pure_parser = 0;
 
 

+/*--------------------------------------------------------------.
+| Return true IFF the rule has a `number' smaller than NRULES.  |
+`--------------------------------------------------------------*/
+
+bool
+rule_useful_p (rule_t *r)
+{
+  return r->number < nrules;
+}
+
+
+/*-------------------------------------------------------------.
+| Return true IFF the rule has a `number' higher than NRULES.  |
+`-------------------------------------------------------------*/
+
+bool
+rule_useless_p (rule_t *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_t *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_t *rule, symbol_t *previous_lhs, FILE *out)
+{
+  fprintf (out, "  %3d ", rule->number);
+  if (previous_lhs != rule->lhs)
+    {
+      fprintf (out, "%s:", rule->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.  |
 `--------------------------------------*/
 /*--------------------------------------.
 | Return the number of symbols in RHS.  |
 `--------------------------------------*/


@@ -72,7 +131,7 @@ rule_rhs_print (rule_t *rule, FILE *out)
     {
       item_number_t *r;
       for (r = rule->rhs; *r >= 0; r++)
     {
       item_number_t *r;
       for (r = rule->rhs; *r >= 0; r++)

-       fprintf (out, " %s", symbol_tag_get (symbols[*r]));
+       fprintf (out, " %s", symbols[*r]->tag);

       fputc ('\n', out);
     }
   else
       fputc ('\n', out);
     }
   else


@@ -89,7 +148,7 @@ rule_rhs_print (rule_t *rule, FILE *out)
 void
 rule_print (rule_t *rule, FILE *out)
 {
 void
 rule_print (rule_t *rule, FILE *out)
 {

-  fprintf (out, "%s:", symbol_tag_get (rule->lhs));
+  fprintf (out, "%s:", rule->lhs->tag);

   rule_rhs_print (rule, out);
 }
 
   rule_rhs_print (rule, out);
 }
 


@@ -105,9 +164,9 @@ ritem_print (FILE *out)
   fputs ("RITEM\n", out);
   for (i = 0; i < nritems; ++i)
     if (ritem[i] >= 0)
   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
     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);
 }
 
   fputs ("\n\n", out);
 }
 


@@ -120,11 +179,11 @@ size_t
 ritem_longest_rhs (void)
 {
   int max = 0;
 ritem_longest_rhs (void)
 {
   int max = 0;

-  int i;
+  rule_number_t r;

 
 

-  for (i = 1; i < nrules + 1; ++i)
+  for (r = 0; r < nrules; ++r)

     {
     {

-      int length = rule_rhs_length (&rules[i]);
+      int length = rule_rhs_length (&rules[r]);

       if (length > max)
        max = length;
     }
       if (length > max)
        max = length;
     }


@@ -133,46 +192,34 @@ ritem_longest_rhs (void)
 }
 
 
 }
 
 

-/*----------------------------------------------------------------.
-| 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,
 
 void
 grammar_rules_partial_print (FILE *out, const char *title,

-                            int begin, int end)
+                            rule_filter_t filter)

 {
   int r;
 {
   int r;

-  symbol_t *last_lhs = NULL;
+  bool first = TRUE;
+  symbol_t *previous_lhs = NULL;

 
   /* rule # : LHS -> RHS */
 
   /* 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);
        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);
       rule_rhs_print (&rules[r], out);

+      previous_lhs = rules[r].lhs;

     }
     }

-  fputs ("\n\n", out);
+  if (!first)
+    fputs ("\n\n", out);

 }
 
 
 }
 
 


@@ -183,7 +230,7 @@ grammar_rules_partial_print (FILE *out, const char *title,
 void
 grammar_rules_print (FILE *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);

 }
 
 
 }
 
 


@@ -194,59 +241,95 @@ grammar_rules_print (FILE *out)
 void
 grammar_dump (FILE *out, const char *title)
 {
 void
 grammar_dump (FILE *out, const char *title)
 {

-  int i;
-  item_number_t *r;
-

   fprintf (out, "%s\n\n", title);
   fprintf (out,
           "ntokens = %d, nvars = %d, nsyms = %d, nrules = %d, nritems = %d\n\n",
           ntokens, nvars, nsyms, nrules, nritems);
   fprintf (out, "%s\n\n", title);
   fprintf (out,
           "ntokens = %d, nvars = %d, nsyms = %d, nrules = %d, nritems = %d\n\n",
           ntokens, nvars, nsyms, nrules, nritems);

-  fprintf (out, "Variables\n---------\n\n");
-  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]));
-  fprintf (out, "\n\n");
-  fprintf (out, "Rules\n-----\n\n");
-  fprintf (out, "Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n");
-  for (i = 1; i < nrules + nuseless_productions + 1; i++)
-    {
-      int rhs_count = 0;
-      /* Find the last RHS index in ritems. */
-      for (r = rules[i].rhs; *r >= 0; ++r)
-       ++rhs_count;
-      fprintf (out, "%3d (%2d, %2d, %2d, %2d-%2d)   %2d ->",
-              i - 1,
-              rules[i].prec ? rules[i].prec->prec : 0,
-              rules[i].prec ? rules[i].prec->assoc : 0,
-              rules[i].useful,
-              rules[i].rhs - ritem,
-              rules[i].rhs - ritem + rhs_count - 1,
-              rules[i].lhs->number);
-      /* Dumped the RHS. */
-      for (r = rules[i].rhs; *r >= 0; r++)
-       fprintf (out, " %3d", *r);
-      fprintf (out, "  [%d]\n", -(*r) - 1);
-    }
+
+
+  fprintf (out, _("Variables\n---------\n\n"));
+  {
+    symbol_number_t 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,
+              symbols[i]->tag);
+    fprintf (out, "\n\n");
+  }
+
+  fprintf (out, _("Rules\n-----\n\n"));
+  {
+    rule_number_t i;
+    fprintf (out, _("Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n"));
+    for (i = 0; i < nrules + nuseless_productions; i++)
+      {
+       rule_t *rule = &rules[i];
+       item_number_t *r = NULL;
+       unsigned int rhs_itemno = rule->rhs - ritem;
+       unsigned int rhs_count = 0;
+       /* Find the last RHS index in ritems. */
+       for (r = rule->rhs; *r >= 0; ++r)
+         ++rhs_count;
+       fprintf (out, "%3d (%2d, %2d, %2d, %2u-%2u)   %2d ->",
+                i,
+                rule->prec ? rule->prec->prec : 0,
+                rule->prec ? rule->prec->assoc : 0,
+                rule->useful,
+                rhs_itemno,
+                rhs_itemno + rhs_count - 1,
+                rule->lhs->number);
+       /* Dumped the RHS. */
+       for (r = rule->rhs; *r >= 0; r++)
+         fprintf (out, " %3d", *r);
+       fprintf (out, "  [%d]\n", item_number_as_rule_number (*r));
+      }
+  }

   fprintf (out, "\n\n");
   fprintf (out, "\n\n");

-  fprintf (out, "Rules interpreted\n-----------------\n\n");
-  for (i = 1; i < nrules + nuseless_productions + 1; i++)
-    {
-      fprintf (out, "%-5d  ", i);
-      rule_print (&rules[i], out);
-    }
+
+  fprintf (out, _("Rules interpreted\n-----------------\n\n"));
+  {
+    rule_number_t r;
+    for (r = 0; r < nrules + nuseless_productions; r++)
+      {
+       fprintf (out, "%-5d  ", r);
+       rule_print (&rules[r], out);
+      }
+  }

   fprintf (out, "\n\n");
 }
 
 
   fprintf (out, "\n\n");
 }
 
 

+/*------------------------------------------------------------------.
+| 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_t 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);
 void
 grammar_free (void)
 {
   XFREE (ritem);

-  free (rules + 1);
+  free (rules);

   XFREE (token_translations);
   /* Free the symbol table data structure.  */
   symbols_free ();
   XFREE (token_translations);
   /* Free the symbol table data structure.  */
   symbols_free ();

+  free_merger_functions ();

 }
 }