Fix some memory leaks.

* src/named-ref.c: Add a pointer check (named_ref_free).
	* src/scan-code.l: New function (variant_table_free). Called in
	code_scanner_free.
	* src/symlist.c: Call to named_ref_free (symbol_list_free).

ChangeLog

@@ -1,3 +1,11 @@
+2009-07-24  Alex Rozenman  <rozenmam@gmail.com>
+
+	Fix some memory leaks.
+	* src/named-ref.c: Add a pointer check (named_ref_free).
+	* src/scan-code.l: New function (variant_table_free). Called in
+	code_scanner_free.
+	* src/symlist.c: Call to named_ref_free (symbol_list_free).
+
 2009-07-24  Joel E. Denny  <jdenny@ces.clemson.edu>
 
 	* src/lalr.c (state_lookahead_tokens_count): Correct comment.

src/named-ref.c

@@ -36,6 +36,7 @@ named_ref_new (uniqstr id, location loc)
 void
 named_ref_free (named_ref *r)
 {
-  free (r);
+  if (r)
+    free (r);
 }
 

src/scan-code.l

@@ -351,6 +351,15 @@ variant_table_grow ()
   return &variant_table[variant_count - 1];
 }
 
+static void
+variant_table_free ()
+{
+  if (variant_table)
+    free (variant_table);
+  variant_table = 0;
+  variant_table_size = variant_count = 0;
+}
+
 static char *
 find_prefix_end (const char *prefix, char *begin, char *end)
 {
@@ -866,6 +875,8 @@ void
 code_scanner_free (void)
 {
   obstack_free (&obstack_for_string, 0);
+  variant_table_free ();
+
   /* Reclaim Flex's buffers.  */
   yylex_destroy ();
 }

src/symlist.c

@@ -146,7 +146,14 @@ symbol_list_prepend (symbol_list *list, symbol_list *node)
 void
 symbol_list_free (symbol_list *list)
 {
-  LIST_FREE (symbol_list, list);
+  symbol_list *node, *next;
+  for (node = list; node; node = next)
+    {
+      next = node->next;
+      if (node->named_ref)
+        named_ref_free (node->named_ref);
+      free (node);
+    }
 }