X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/e68e0410aba6a9b976a1e496aa80ffb3d2095fb9..c53b6848897960bc783afdbc230e1a247977d63d:/src/derives.c

diff --git a/src/derives.c b/src/derives.c
index 456dfb22..c834f0b0 100644
--- a/src/derives.c
+++ b/src/derives.c
@@ -1,39 +1,41 @@
 /* Match rules with nonterminals for bison,
-   Copyright 1984, 1989, 2000, 2001, 2002  Free Software Foundation, Inc.
+
+   Copyright (C) 1984, 1989, 2000-2003, 2005, 2009-2013 Free Software
+   Foundation, Inc.
 
    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
-   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
-   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 "getargs.h"
-#include "symtab.h"
-#include "reader.h"
-#include "gram.h"
+
 #include "derives.h"
+#include "gram.h"
+#include "reader.h"
+#include "symtab.h"
 
 /* Linked list of rule numbers.  */
-typedef struct rule_list_s
+typedef struct rule_list
 {
-  struct rule_list_s *next;
-  rule_number_t value;
-} rule_list_t;
+  struct rule_list *next;
+  rule *value;
+} rule_list;
 
-rule_number_t **derives = NULL;
+rule ***derives;
 
 static void
 print_derives (void)
@@ -44,13 +46,14 @@ print_derives (void)
 
   for (i = ntokens; i < nsyms; i++)
     {
-      rule_number_t *rp;
-      fprintf (stderr, "\t%s derives\n", symbols[i]->tag);
-      for (rp = derives[i]; *rp > 0; rp++)
-	{
-	  fprintf (stderr, "\t\t%3d ", *rp - 1);
-	  rule_rhs_print (&rules[*rp], stderr);
-	}
+      rule **rp;
+      fprintf (stderr, "  %s derives\n", symbols[i]->tag);
+      for (rp = derives[i - ntokens]; *rp; ++rp)
+        {
+          fprintf (stderr, "    %3d ", (*rp)->user_number);
+          rule_rhs_print (*rp, stderr);
+          fprintf (stderr, "\n");
+        }
     }
 
   fputs ("\n\n", stderr);
@@ -58,60 +61,60 @@ print_derives (void)
 
 
 void
-set_derives (void)
+derives_compute (void)
 {
-  symbol_number_t i;
-  rule_number_t r;
-  rule_number_t *q;
+  symbol_number i;
+  rule_number r;
+  rule **q;
 
-  /* DSET[NTERM] -- A linked list of the numbers of the rules whose
-     LHS is NTERM.  */
-  rule_list_t **dset = XCALLOC (rule_list_t *, nvars) - ntokens;
+  /* DSET[NTERM - NTOKENS] -- A linked list of the numbers of the rules
+     whose LHS is NTERM.  */
+  rule_list **dset = xcalloc (nvars, sizeof *dset);
 
   /* DELTS[RULE] -- There are NRULES rule number to attach to nterms.
      Instead of performing NRULES allocations for each, have an array
      indexed by rule numbers.  */
-  rule_list_t *delts = XCALLOC (rule_list_t, nrules + 1);
+  rule_list *delts = xnmalloc (nrules, sizeof *delts);
 
-  for (r = nrules; r > 0; r--)
+  for (r = nrules - 1; r >= 0; --r)
     {
-      symbol_number_t lhs = rules[r].lhs->number;
-      rule_list_t *p = &delts[r];
+      symbol_number lhs = rules[r].lhs->number;
+      rule_list *p = &delts[r];
       /* A new LHS is found.  */
-      p->next = dset[lhs];
-      p->value = r;
-      dset[lhs] = p;
+      p->next = dset[lhs - ntokens];
+      p->value = &rules[r];
+      dset[lhs - ntokens] = p;
     }
 
   /* DSET contains what we need under the form of a linked list.  Make
      it a single array.  */
 
-  derives = XCALLOC (rule_number_t *, nvars) - ntokens;
-  q = XCALLOC (rule_number_t, nvars + int_of_rule_number (nrules));
+  derives = xnmalloc (nvars, sizeof *derives);
+  q = xnmalloc (nvars + nrules, sizeof *q);
 
   for (i = ntokens; i < nsyms; i++)
     {
-      rule_list_t *p = dset[i];
-      derives[i] = q;
+      rule_list *p = dset[i - ntokens];
+      derives[i - ntokens] = q;
       while (p)
-	{
-	  *q++ = p->value;
-	  p = p->next;
-	}
-      *q++ = -1;
+        {
+          *q++ = p->value;
+          p = p->next;
+        }
+      *q++ = NULL;
     }
 
-  if (trace_flag)
+  if (trace_flag & trace_sets)
     print_derives ();
 
-  free (dset + ntokens);
+  free (dset);
   free (delts);
 }
 
 
 void
-free_derives (void)
+derives_free (void)
 {
-  XFREE (derives[ntokens]);
-  XFREE (derives + ntokens);
+  free (derives[0]);
+  free (derives);
 }