Merge remote-tracking branch 'origin/maint'

[bison.git] / src / gram.c

diff --git a/src/gram.c b/src/gram.c
index 9189a1cf0368e9c52d0d4c1e4a7c66ef8af6ef93..ef5353a6c4e241087b6df175ce8424f8cf3930b8 100644 (file)
--- a/src/gram.c
+++ b/src/gram.c
@@ -1,104 +1,333 @@
-/* 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, 2001-2003, 2005-2012 Free Software
+   Foundation, Inc.

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

-   Bison is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by
    it under the terms of the GNU General Public License as published by

-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.

 
 

-   Bison is distributed in the hope that it will be useful,
+   This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License

-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
-
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 

+#include <config.h>

 #include "system.h"
 #include "system.h"

-#include "quotearg.h"
+
+#include "complain.h"
+#include "getargs.h"

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

-#include "symtab.h"
+#include "print-xml.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;
-int nritems = 0;
+item_number *ritem = NULL;
+unsigned int nritems = 0;

 
 

-rule_t *rules = NULL;
-int 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;
 

-token_number_t *token_translations = NULL;
-
-int start_symbol = 0;
+symbol_number *token_translations = NULL;

 
 int max_user_token_number = 256;
 
 
 int max_user_token_number = 256;
 

-int semantic_parser = 0;
+bool
+rule_useful_in_grammar_p (rule *r)
+{
+  return r->number < nrules;
+}
+
+bool
+rule_useless_in_grammar_p (rule *r)
+{
+  return !rule_useful_in_grammar_p (r);
+}

 
 

-int pure_parser = 0;
+bool
+rule_useless_in_parser_p (rule *r)
+{
+  return !r->useful && rule_useful_in_grammar_p (r);
+}

 
 

+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.  |
-`--------------------------------------*/
+void
+rule_lhs_print_xml (rule *r, FILE *out, int level)
+{
+  xml_printf (out, level, "<lhs>%s</lhs>", r->lhs->tag);
+}

 
 

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

 {
 {

-  int res = 0;
-  item_number_t *rhsp;
-  for (rhsp = rule->rhs; *rhsp >= 0; ++rhsp)
+  size_t res = 0;
+  item_number *rhsp;
+  for (rhsp = r->rhs; *rhsp >= 0; ++rhsp)

     ++res;
   return res;
 }
 
     ++res;
   return res;
 }
 

+void
+rule_rhs_print (rule *r, FILE *out)
+{
+  if (*r->rhs >= 0)
+    {
+      item_number *rp;
+      for (rp = r->rhs; *rp >= 0; rp++)
+        fprintf (out, " %s", symbols[*rp]->tag);
+    }
+  else
+    {
+      fprintf (out, " /* %s */", _("empty"));
+    }
+}
+
+static void
+rule_rhs_print_xml (rule *r, FILE *out, int level)
+{
+  if (*r->rhs >= 0)
+    {
+      item_number *rp;
+      xml_puts (out, level, "<rhs>");
+      for (rp = r->rhs; *rp >= 0; rp++)
+        xml_printf (out, level + 1, "<symbol>%s</symbol>",
+                    xml_escape (symbols[*rp]->tag));
+      xml_puts (out, level, "</rhs>");
+    }
+  else
+    {
+      xml_puts (out, level, "<rhs>");
+      xml_puts (out, level + 1, "<empty/>");
+      xml_puts (out, level, "</rhs>");
+    }
+}

 
 

-/*------------------------.
-| Dump RITEM for traces.  |
-`------------------------*/
+static void
+rule_print (rule *r, FILE *out)
+{
+  fprintf (out, "%s:", r->lhs->tag);
+  rule_rhs_print (r, out);
+}

 
 void
 ritem_print (FILE *out)
 {
 
 void
 ritem_print (FILE *out)
 {

-  int i;
+  unsigned int i;

   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", quotearg_style (escape_quoting_style,
-                                           symbols[ritem[i]]->tag));
+      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);
 }
 

-
-/*------------------------------------------.
-| Return the size of the longest rule RHS.  |
-`------------------------------------------*/
-

 size_t
 ritem_longest_rhs (void)
 {
   int max = 0;
 size_t
 ritem_longest_rhs (void)
 {
   int max = 0;

-  int i;
+  rule_number 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)
       if (length > max)

-       max = length;
+        max = length;

     }
 
   return max;
 }
     }
 
   return max;
 }

+
+void
+grammar_rules_partial_print (FILE *out, const char *title,
+                             rule_filter filter)
+{
+  rule_number r;
+  bool first = true;
+  symbol *previous_lhs = NULL;
+
+  /* rule # : LHS -> RHS */
+  for (r = 0; r < nrules + nuseless_productions; r++)
+    {
+      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);
+      first = false;
+      rule_lhs_print (&rules[r], previous_lhs, out);
+      rule_rhs_print (&rules[r], out);
+      fprintf (out, "\n");
+      previous_lhs = rules[r].lhs;
+    }
+  if (!first)
+    fputs ("\n\n", out);
+}
+
+void
+grammar_rules_print (FILE *out)
+{
+  grammar_rules_partial_print (out, _("Grammar"), rule_useful_in_grammar_p);
+}
+
+void
+grammar_rules_print_xml (FILE *out, int level)
+{
+  rule_number r;
+  bool first = true;
+
+  for (r = 0; r < nrules + nuseless_productions; r++)
+    {
+      if (first)
+        xml_puts (out, level + 1, "<rules>");
+      first = false;
+      {
+        char const *usefulness;
+        if (rule_useless_in_grammar_p (&rules[r]))
+          usefulness = "useless-in-grammar";
+        else if (rule_useless_in_parser_p (&rules[r]))
+          usefulness = "useless-in-parser";
+        else
+          usefulness = "useful";
+        xml_indent (out, level + 2);
+        fprintf (out, "<rule number=\"%d\" usefulness=\"%s\"",
+                 rules[r].number, usefulness);
+        if (rules[r].precsym)
+          fprintf (out, " percent_prec=\"%s\"",
+                   xml_escape (rules[r].precsym->tag));
+        fputs (">\n", out);
+      }
+      rule_lhs_print_xml (&rules[r], out, level + 3);
+      rule_rhs_print_xml (&rules[r], out, level + 3);
+      xml_puts (out, level + 2, "</rule>");
+    }
+  if (!first)
+    xml_puts (out, level + 1, "</rules>");
+  else
+   xml_puts (out, level + 1, "<rules/>");
+}
+
+void
+grammar_dump (FILE *out, const char *title)
+{
+  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");
+  {
+    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,
+               symbols[i]->tag);
+    fprintf (out, "\n\n");
+  }
+
+  fprintf (out, "Rules\n-----\n\n");
+  {
+    rule_number i;
+    fprintf (out, "Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n");
+    for (i = 0; i < nrules + nuseless_productions; i++)
+      {
+        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. */
+        for (rp = rule_i->rhs; *rp >= 0; ++rp)
+          ++rhs_count;
+        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 (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");
+  {
+    rule_number r;
+    for (r = 0; r < nrules + nuseless_productions; r++)
+      {
+        fprintf (out, "%-5d  ", r);
+        rule_print (&rules[r], out);
+        fprintf (out, "\n");
+      }
+  }
+  fprintf (out, "\n\n");
+}
+
+void
+grammar_rules_useless_report (const char *message)
+{
+  warnings w = Wother;
+  if (warnings_flag & w)
+    {
+      rule_number r;
+      for (r = 0; r < nrules ; ++r)
+        if (!rules[r].useful)
+          {
+            complain_at (rules[r].location, w | silent, "%s: ", message);
+            rule_print (&rules[r], stderr);
+            warnings_print_categories (w);
+            fprintf (stderr, "\n");
+          }
+    }
+}
+
+void
+grammar_free (void)
+{
+  if (ritem)
+    free (ritem - 1);
+  free (rules);
+  free (token_translations);
+  /* Free the symbol table data structure.  */
+  symbols_free ();
+  free_merger_functions ();
+}