Warn about unused values.

[bison.git] / src / symlist.c

diff --git a/src/symlist.c b/src/symlist.c
index 9d46d8a522dda81b83f525c807040fc54343d05a..ed42ce1e7747994b05ed569cf41c5289cff3aba0 100644 (file)
--- a/src/symlist.c
+++ b/src/symlist.c
@@ -1,6 +1,6 @@
 /* Lists of symbols for Bison
 
-   Copyright (C) 2002 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2005 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -16,9 +16,10 @@
 
    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.  */
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
 
+#include <config.h>
 #include "system.h"
 
 #include "complain.h"
@@ -32,18 +33,40 @@
 symbol_list *
 symbol_list_new (symbol *sym, location loc)
 {
-  symbol_list *res = XMALLOC (symbol_list, 1);
-  res->next = NULL;
+  symbol_list *res = xmalloc (sizeof *res);
+
   res->sym = sym;
   res->location = loc;
+
   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 (symbol_list *l, FILE *f)
+{
+  for (/* Nothing. */; l && l->sym; l = l->next)
+    {
+      symbol_print (l->sym, f);
+      if (l && l->sym)
+       fprintf (f, ", ");
+    }
+}
+
+
 /*---------------------------------.
 | Prepend SYM at LOC to the LIST.  |
 `---------------------------------*/
@@ -73,43 +96,64 @@ symbol_list_free (symbol_list *list)
 `--------------------*/
 
 unsigned int
-symbol_list_length (symbol_list *list)
+symbol_list_length (symbol_list *l)
 {
   int res = 0;
-  for (/* Nothing. */; list; list = list->next)
+  for (/* Nothing. */; l; l = l->next)
     ++res;
   return res;
 }
 
 
-/*--------------------------------------------------------------.
-| Get the data type (alternative in the union) of the value for |
-| symbol N in symbol list RP.                                   |
-`--------------------------------------------------------------*/
+/*--------------------------------.
+| Get symbol N in symbol list L.  |
+`--------------------------------*/
 
-uniqstr
-symbol_list_n_type_name_get (symbol_list *rp, location loc, int n)
+symbol_list *
+symbol_list_n_get (symbol_list *l, int n)
 {
   int i;
 
   if (n < 0)
+    return NULL;
+
+  for (i = 0; i < n; ++i)
     {
-      complain_at (loc, _("invalid $ value"));
-      return NULL;
+      l = l->next;
+      if (l == NULL || l->sym == NULL)
+       return NULL;
     }
 
-  i = 0;
+  return l;
+}
+
+
+/*--------------------------------------------------------------.
+| Get the data type (alternative in the union) of the value for |
+| symbol N in symbol list L.                                    |
+`--------------------------------------------------------------*/
 
-  while (i < n)
+uniqstr
+symbol_list_n_type_name_get (symbol_list *l, location loc, int n)
+{
+  l = symbol_list_n_get (l, n);
+  if (!l)
     {
-      rp = rp->next;
-      if (rp == NULL || rp->sym == NULL)
-       {
-         complain_at (loc, _("invalid $ value"));
-         return NULL;
-       }
-      ++i;
+      complain_at (loc, _("invalid $ value: $%d"), n);
+      return NULL;
     }
+  return l->sym->type_name;
+}
 
-  return rp->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;
 }