glsl/list: Add a foreach_list_typed_safe_reverse macro

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>

diff --git a/src/glsl/list.h b/src/glsl/list.h
index 4774ccca218a7f3076adc74b7c01fa88afd21b5f..330c17e378b193fe10ed0bb219889e2a39d67669 100644 (file)
--- a/src/glsl/list.h
+++ b/src/glsl/list.h
@@ -678,4 +678,13 @@ inline void exec_node::insert_before(exec_list *before)
         __node = __next, __next =                                          \
            exec_node_data(__type, (__next)->__field.next, __field))
 
+#define foreach_list_typed_safe_reverse(__type, __node, __field, __list)   \
+   for (__type * __node =                                                  \
+           exec_node_data(__type, (__list)->tail_pred, __field),           \
+               * __prev =                                                  \
+           exec_node_data(__type, (__node)->__field.prev, __field);        \
+        __prev != NULL;                                                    \
+        __node = __prev, __prev =                                          \
+           exec_node_data(__type, (__prev)->__field.prev, __field))
+
 #endif /* LIST_CONTAINER_H */