exec_list: Add a foreach_list_typed_from macro

This allows iterating list nodes from a given start point instead of
necessarily the list head.

Signed-off-by: Robert Bragg <robert@sixbynine.org>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/compiler/glsl/list.h b/src/compiler/glsl/list.h
index 6afb9dc..47f53b8 100644 (file)
--- a/src/compiler/glsl/list.h
+++ b/src/compiler/glsl/list.h
@@ -699,6 +699,11 @@ inline void exec_node::insert_before(exec_list *before)
        (__node)->__field.next != NULL;                                 \
        (__node) = exec_node_data(__type, (__node)->__field.next, __field))
 
+#define foreach_list_typed_from(__type, __node, __field, __list, __start)  \
+   for (__type * __node = exec_node_data(__type, (__start), __field);      \
+       (__node)->__field.next != NULL;                                    \
+       (__node) = exec_node_data(__type, (__node)->__field.next, __field))
+
 #define foreach_list_typed_reverse(__type, __node, __field, __list)        \
    for (__type * __node =                                                \
            exec_node_data(__type, (__list)->tail_sentinel.prev, __field);  \