* src/scan-gram.l (code_start): Always initialize it when entering

[bison.git] / src / gram.c

diff --git a/src/gram.c b/src/gram.c
index 72086e3ce6db4f6900b03b8fa719f58169b6f1cd..86f75ec7b8f3d13fa208982e6f628ac46b471228 100644 (file)
--- a/src/gram.c
+++ b/src/gram.c
@@ -1,5 +1,7 @@
-/* Allocate input grammar variables for bison,
-   Copyright (C) 1984, 1986, 1989, 2001, 2002 Free Software Foundation, Inc.
+/* Allocate input grammar variables for Bison.
+
+   Copyright (C) 1984, 1986, 1989, 2001, 2002, 2003 Free Software
+   Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -20,26 +22,28 @@
 
 
 #include "system.h"
 
 
 #include "system.h"

-#include "quotearg.h"
-#include "symtab.h"
+
+#include <quotearg.h>
+

 #include "gram.h"
 #include "gram.h"

-#include "reduce.h"

 #include "reader.h"
 #include "reader.h"

+#include "reduce.h"
+#include "symtab.h"

 
 /* Comments for these variables are in gram.h.  */
 
 
 /* Comments for these variables are in gram.h.  */
 

-item_number_t *ritem = NULL;
+item_number *ritem = NULL;

 unsigned int nritems = 0;
 
 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;
 
 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 max_user_token_number = 256;
 


@@ -47,6 +51,40 @@ 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 *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  |
 /*----------------------------------------------------------------.
 | Print this RULE's number and lhs on OUT.  If a PREVIOUS_LHS was |
 | already displayed (by a previous call for another rule), avoid  |


@@ -54,17 +92,17 @@ int pure_parser = 0;
 `----------------------------------------------------------------*/
 
 void
 `----------------------------------------------------------------*/
 
 void

-rule_lhs_print (rule_t *rule, symbol_t *previous_lhs, FILE *out)
+rule_lhs_print (rule *r, symbol *previous_lhs, FILE *out)

 {
 {

-  fprintf (out, "  %3d ", rule->number - 1);
-  if (previous_lhs != rule->lhs)
+  fprintf (out, "  %3d ", r->number);
+  if (previous_lhs != r->lhs)

     {
     {

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

     }
   else
     {
       int n;
     }
   else
     {
       int n;

-      for (n = strlen (symbol_tag_get (previous_lhs)); n > 0; --n)
+      for (n = strlen (previous_lhs->tag); n > 0; --n)

        fputc (' ', out);
       fputc ('|', out);
     }
        fputc (' ', out);
       fputc ('|', out);
     }


@@ -76,28 +114,28 @@ rule_lhs_print (rule_t *rule, symbol_t *previous_lhs, FILE *out)
 `--------------------------------------*/
 
 int
 `--------------------------------------*/
 
 int

-rule_rhs_length (rule_t *rule)
+rule_rhs_length (rule *r)

 {
   int res = 0;
 {
   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;
 }
 
 
 /*-------------------------------.
     ++res;
   return res;
 }
 
 
 /*-------------------------------.

-| Print this RULE's RHS on OUT.  |
+| Print this rule's RHS on OUT.  |

 `-------------------------------*/
 
 void
 `-------------------------------*/
 
 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
       fputc ('\n', out);
     }
   else


@@ -108,14 +146,14 @@ rule_rhs_print (rule_t *rule, FILE *out)
 
 
 /*-------------------------.
 
 
 /*-------------------------.

-| Print this RULE on OUT.  |
+| Print this rule on OUT.  |

 `-------------------------*/
 
 void
 `-------------------------*/
 
 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);

 }
 
 
 }
 
 


@@ -130,9 +168,9 @@ 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);
 }
 


@@ -145,9 +183,9 @@ size_t
 ritem_longest_rhs (void)
 {
   int max = 0;
 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)
     {
       int length = rule_rhs_length (&rules[r]);
       if (length > max)


@@ -158,29 +196,34 @@ ritem_longest_rhs (void)
 }
 
 
 }
 
 

-/*----------------------------------------------------------------.
-| Print the grammar's rules numbers from BEGIN (inclusive) to END |
-| (exclusive) on OUT under TITLE.                                 |
-`----------------------------------------------------------------*/
+/*-----------------------------------------------------------------.
+| 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,

-                            rule_number_t begin, rule_number_t end)
+                            rule_filter filter)

 {
 {

-  int r;
-  symbol_t *previous_lhs = NULL;
+  rule_number r;
+  bool first = true;
+  symbol *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 (previous_lhs && previous_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);

+      first = false;

       rule_lhs_print (&rules[r], previous_lhs, out);
       rule_rhs_print (&rules[r], out);
       previous_lhs = rules[r].lhs;
     }
       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);

 }
 
 
 }
 
 


@@ -191,7 +234,7 @@ 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);

 }
 
 
 }
 
 


@@ -210,49 +253,50 @@ grammar_dump (FILE *out, const char *title)
 
   fprintf (out, "Variables\n---------\n\n");
   {
 
   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,
     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");
   {
     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");
     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 *rp = NULL;
+       unsigned int rhs_itemno = rule_i->rhs - ritem;
+       unsigned int rhs_count = 0;

        /* Find the last RHS index in ritems. */
        /* Find the last RHS index in ritems. */

-       for (r = rule->rhs; *r >= 0; ++r)
+       for (rp = rule_i->rhs; *rp >= 0; ++rp)

          ++rhs_count;
          ++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. */
        /* Dumped the RHS. */

-       for (r = rule->rhs; *r >= 0; r++)
-         fprintf (out, " %3d", *r);
-       fprintf (out, "  [%d]\n", -(*r) - 1);
+       for (rp = rule_i->rhs; *rp >= 0; rp++)
+         fprintf (out, " %3d", *rp);
+       fprintf (out, "  [%d]\n", item_number_as_rule_number (*rp));

       }
   }
   fprintf (out, "\n\n");
 
   fprintf (out, "Rules interpreted\n-----------------\n\n");
   {
       }
   }
   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);
       {
        fprintf (out, "%-5d  ", r);
        rule_print (&rules[r], out);


@@ -262,11 +306,32 @@ grammar_dump (FILE *out, const char *title)
 }
 
 
 }
 
 

+/*------------------------------------------------------------------.
+| 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);
 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 ();