1 files changed, 162 insertions, 0 deletions
diff --git a/src/symlist.c b/src/symlist.c
new file mode 100644
index 00000000..70db82f0
--- /dev/null
+++ b/src/symlist.c
@@ -0,0 +1,162 @@
+/* Lists of symbols for Bison
+
+   Copyright (C) 2002, 2005, 2006 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
+   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.
+
+   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., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+#include "system.h"
+
+#include "complain.h"
+#include "symlist.h"
+
+
+/*--------------------------------------.
+| Create a list containing SYM at LOC.  |
+`--------------------------------------*/
+
+symbol_list *
+symbol_list_new (symbol *sym, location loc)
+{
+  symbol_list *res = xmalloc (sizeof *res);
+
+  res->sym = sym;
+  res->location = loc;
+
+  res->midrule = NULL;
+
+  res->action = NULL;
+  res->used = false;
+
+  res->ruleprec = NULL;
+  res->dprec = 0;
+  res->merger = 0;
+
+  res->next = NULL;
+
+  return res;
+}
+
+
+/*------------------.
+| Print this list.  |
+`------------------*/
+
+void
+symbol_list_print (const symbol_list *l, FILE *f)
+{
+  for (/* Nothing. */; l && l->sym; l = l->next)
+    {
+      symbol_print (l->sym, f);
+      fprintf (stderr, l->used ? " used" : " unused");
+      if (l && l->sym)
+	fprintf (f, ", ");
+    }
+}
+
+
+/*---------------------------------.
+| Prepend SYM at LOC to the LIST.  |
+`---------------------------------*/
+
+symbol_list *
+symbol_list_prepend (symbol_list *list, symbol *sym, location loc)
+{
+  symbol_list *res = symbol_list_new (sym, loc);
+  res->next = list;
+  return res;
+}
+
+
+/*-------------------------------------------------.
+| Free the LIST, but not the symbols it contains.  |
+`-------------------------------------------------*/
+
+void
+symbol_list_free (symbol_list *list)
+{
+  LIST_FREE (symbol_list, list);
+}
+
+
+/*--------------------.
+| Return its length.  |
+`--------------------*/
+
+unsigned int
+symbol_list_length (const symbol_list *l)
+{
+  int res = 0;
+  for (/* Nothing. */; l; l = l->next)
+    ++res;
+  return res;
+}
+
+
+/*--------------------------------.
+| Get symbol N in symbol list L.  |
+`--------------------------------*/
+
+symbol_list *
+symbol_list_n_get (symbol_list *l, int n)
+{
+  int i;
+
+  if (n < 0)
+    return NULL;
+
+  for (i = 0; i < n; ++i)
+    {
+      l = l->next;
+      if (l == NULL || l->sym == NULL)
+	return NULL;
+    }
+
+  return l;
+}
+
+
+/*--------------------------------------------------------------.
+| Get the data type (alternative in the union) of the value for |
+| symbol N in symbol list L.                                    |
+`--------------------------------------------------------------*/
+
+uniqstr
+symbol_list_n_type_name_get (symbol_list *l, location loc, int n)
+{
+  l = symbol_list_n_get (l, n);
+  if (!l)
+    {
+      complain_at (loc, _("invalid $ value: $%d"), n);
+      return NULL;
+    }
+  return l->sym->type_name;
+}
+
+
+/*----------------------------------------.
+| The symbol N in symbol list L is USED.  |
+`----------------------------------------*/
+
+void
+symbol_list_n_used_set (symbol_list *l, int n, bool used)
+{
+  l = symbol_list_n_get (l, n);
+  if (l)
+    l->used = used;
+}