Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/src/derives.c

+/* Match rules with nonterminals for bison,
+
+   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2003, 2005 Free
+   Software Foundation, Inc.
+
+   This file is part of Bison, the GNU Compiler Compiler.
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+#include "system.h"
+
+#include "getargs.h"
+
+#include "derives.h"
+#include "gram.h"
+#include "reader.h"
+#include "symtab.h"
+
+/* Linked list of rule numbers.  */
+typedef struct rule_list
+{
+  struct rule_list *next;
+  rule *value;
+} rule_list;
+
+rule ***derives;
+
+static void
+print_derives (void)
+{
+  int i;
+
+  fputs ("DERIVES\n", stderr);
+
+  for (i = ntokens; i < nsyms; i++)
+    {
+      rule **rp;
+      fprintf (stderr, "\t%s derives\n", symbols[i]->tag);
+      for (rp = derives[i - ntokens]; *rp; ++rp)
+        {
+          fprintf (stderr, "\t\t%3d ", (*rp)->user_number);
+          rule_rhs_print (*rp, stderr);
+        }
+    }
+
+  fputs ("\n\n", stderr);
+}
+
+
+void
+derives_compute (void)
+{
+  symbol_number i;
+  rule_number r;
+  rule **q;
+
+  /* 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 *delts = xnmalloc (nrules, sizeof *delts);
+
+  for (r = nrules - 1; r >= 0; --r)
+    {
+      symbol_number lhs = rules[r].lhs->number;
+      rule_list *p = &delts[r];
+      /* A new LHS is found.  */
+      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 = xnmalloc (nvars, sizeof *derives);
+  q = xnmalloc (nvars + nrules, sizeof *q);
+
+  for (i = ntokens; i < nsyms; i++)
+    {
+      rule_list *p = dset[i - ntokens];
+      derives[i - ntokens] = q;
+      while (p)
+        {
+          *q++ = p->value;
+          p = p->next;
+        }
+      *q++ = NULL;
+    }
+
+  if (trace_flag & trace_sets)
+    print_derives ();
+
+  free (dset);
+  free (delts);
+}
+
+
+void
+derives_free (void)
+{
+  free (derives[0]);
+  free (derives);
+}