X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/122c0aacef4088dccca6fce5559fb3617aa25e81..e9f87b5b7df2e328d2e4196d276c0d96594c906b:/src/derives.c?ds=sidebyside

diff --git a/src/derives.c b/src/derives.c
index f7dfaf73..795bc08e 100644
--- a/src/derives.c
+++ b/src/derives.c
@@ -1,65 +1,84 @@
 /* Match rules with nonterminals for bison,
-   Copyright (C) 1984, 1989 Free Software Foundation, Inc.
+   Copyright 1984, 1989, 2000, 2001  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
-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.
+   Bison 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.
 
-Bison 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.
+   Bison 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   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.  */
 
 
-/* set_derives finds, for each variable (nonterminal), which rules can derive it.
-   It sets up the value of derives so that
-   derives[i - ntokens] points to a vector of rule numbers,
-   terminated with -1.  */
-
-#include <stdio.h>
 #include "system.h"
-#include "new.h"
+#include "getargs.h"
+#include "symtab.h"
 #include "types.h"
+#include "reader.h"
 #include "gram.h"
+#include "derives.h"
 
+short **derives = NULL;
 
-short **derives;
-
-void
-set_derives()
+static void
+print_derives (void)
 {
-  register int i;
-  register int lhs;
-  register shorts *p;
-  register short *q;
-  register shorts **dset;
-  register shorts *delts;
+  int i;
 
-  dset = NEW2(nvars, shorts *) - ntokens;
-  delts = NEW2(nrules + 1, shorts);
+  fputs ("DERIVES\n", stderr);
 
-  p = delts;
-  for (i = nrules; i > 0; i--)
+  for (i = ntokens; i < nsyms; i++)
     {
-      lhs = rlhs[i];
-      if (lhs >= 0)
+      short *sp;
+      fprintf (stderr, "\t%s derives\n", symbols[i]->tag);
+      for (sp = derives[i]; *sp > 0; sp++)
 	{
-	  p->next = dset[lhs];
-	  p->value = i;
-	  dset[lhs] = p;
-	  p++;
+	  short *rhsp;
+	  fprintf (stderr, "\t\t%d:", *sp);
+	  for (rhsp = &ritem[rules[*sp].rhs]; *rhsp >= 0; ++rhsp)
+	    fprintf (stderr, " %s", symbols[*rhsp]->tag);
+	  fprintf (stderr, " (rule %d)\n", -*rhsp - 1);
 	}
     }
 
-  derives = NEW2(nvars, short *) - ntokens;
-  q = NEW2(nvars + nrules, short);
+  fputs ("\n\n", stderr);
+}
+
+
+void
+set_derives (void)
+{
+  int i;
+  shorts *p;
+  short *q;
+  shorts **dset;
+  shorts *delts;
+
+  dset = XCALLOC (shorts *, nvars) - ntokens;
+  delts = XCALLOC (shorts, nrules + 1);
+
+  p = delts;
+  for (i = nrules; i > 0; i--)
+    if (rules[i].useful)
+      {
+	int lhs = rules[i].lhs;
+	p->next = dset[lhs];
+	p->value = i;
+	dset[lhs] = p;
+	p++;
+      }
+
+  derives = XCALLOC (short *, nvars) - ntokens;
+  q = XCALLOC (short, nvars + nrules);
 
   for (i = ntokens; i < nsyms; i++)
     {
@@ -73,46 +92,16 @@ set_derives()
       *q++ = -1;
     }
 
-#ifdef	DEBUG
-  print_derives();
-#endif
+  if (trace_flag)
+    print_derives ();
 
-  FREE(dset + ntokens);
-  FREE(delts);
+  XFREE (dset + ntokens);
+  XFREE (delts);
 }
 
 void
-free_derives()
-{
-  FREE(derives[ntokens]);
-  FREE(derives + ntokens);
-}
-
-
-
-#ifdef	DEBUG
-
-print_derives()
+free_derives (void)
 {
-  register int i;
-  register short *sp;
-
-  extern char **tags;
-
-  printf("\n\n\nDERIVES\n\n");
-
-  for (i = ntokens; i < nsyms; i++)
-    {
-      printf("%s derives", tags[i]);
-      for (sp = derives[i]; *sp > 0; sp++)
-	{
-	  printf("  %d", *sp);
-	}
-      putchar('\n');
-    }
-
-  putchar('\n');
+  XFREE (derives[ntokens]);
+  XFREE (derives + ntokens);
 }
-
-#endif
-