X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/b2ca4022ea6c61e10ac87a0a92bb0f998ecf8b48..616429b50868bf9225d55143526442a024e32969:/src/derives.c?ds=sidebyside

diff --git a/src/derives.c b/src/derives.c
index 3c1d3f62..795bc08e 100644
--- a/src/derives.c
+++ b/src/derives.c
@@ -1,5 +1,5 @@
 /* Match rules with nonterminals for bison,
-   Copyright (C) 1984, 1989, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1989, 2000, 2001  Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -19,72 +19,66 @@
    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 "system.h"
-#include "alloc.h"
+#include "getargs.h"
+#include "symtab.h"
 #include "types.h"
+#include "reader.h"
 #include "gram.h"
 #include "derives.h"
 
-#if DEBUG
+short **derives = NULL;
 
 static void
 print_derives (void)
 {
-  register int i;
-  register short *sp;
+  int i;
 
-  printf (_("\n\n\nDERIVES\n\n"));
+  fputs ("DERIVES\n", stderr);
 
   for (i = ntokens; i < nsyms; i++)
     {
-      printf (_("%s derives"), tags[i]);
+      short *sp;
+      fprintf (stderr, "\t%s derives\n", symbols[i]->tag);
       for (sp = derives[i]; *sp > 0; sp++)
 	{
-	  printf ("  %d", *sp);
+	  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);
 	}
-      putchar ('\n');
     }
 
-  putchar ('\n');
+  fputs ("\n\n", stderr);
 }
 
-#endif
-
-short **derives;
 
 void
 set_derives (void)
 {
-  register int i;
-  register int lhs;
-  register shorts *p;
-  register short *q;
-  register shorts **dset;
-  register shorts *delts;
+  int i;
+  shorts *p;
+  short *q;
+  shorts **dset;
+  shorts *delts;
 
-  dset = NEW2 (nvars, shorts *) - ntokens;
-  delts = NEW2 (nrules + 1, shorts);
+  dset = XCALLOC (shorts *, nvars) - ntokens;
+  delts = XCALLOC (shorts, nrules + 1);
 
   p = delts;
   for (i = nrules; i > 0; i--)
-    {
-      lhs = rlhs[i];
-      if (lhs >= 0)
-	{
-	  p->next = dset[lhs];
-	  p->value = i;
-	  dset[lhs] = p;
-	  p++;
-	}
-    }
-
-  derives = NEW2 (nvars, short *) - ntokens;
-  q = NEW2 (nvars + nrules, short);
+    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++)
     {
@@ -98,17 +92,16 @@ set_derives (void)
       *q++ = -1;
     }
 
-#if DEBUG
-  print_derives ();
-#endif
+  if (trace_flag)
+    print_derives ();
 
-  FREE (dset + ntokens);
-  FREE (delts);
+  XFREE (dset + ntokens);
+  XFREE (delts);
 }
 
 void
 free_derives (void)
 {
-  FREE (derives[ntokens]);
-  FREE (derives + ntokens);
+  XFREE (derives[ntokens]);
+  XFREE (derives + ntokens);
 }