added macro foreach_out_edges_safe(), which allows an iteration over a

nodes outgoing edges, which is safe against alteration of an edge while
iterating.

[r6656]

diff --git a/ir/ir/iredges.h b/ir/ir/iredges.h
index 90e618a..23c7a5d 100644 (file)
--- a/ir/ir/iredges.h
+++ b/ir/ir/iredges.h
@@ -47,6 +47,23 @@ const ir_edge_t *get_irn_out_edge_next(const ir_node *irn,
 #define foreach_out_edge(irn,edge) \
        for(edge = get_irn_out_edge_first(irn); edge; edge = get_irn_out_edge_next(irn, edge))
 
+/**
+ * A convenience iteration macro over all out edges of a node, which is safe
+ * against alteration of the current edge.
+ * @param irn The node.
+ * @param edge An @c ir_edge_t pointer which shall be set to the current
+ * edge.
+ * @param ne The next edge, enables alteration safe erge processing.
+ */
+#define foreach_out_edge_safe(irn,edge,ne) \
+       for( \
+               (edge) = (get_irn_out_edge_first(irn)), \
+                       (ne) = ((edge) ? (get_irn_out_edge_next(irn, edge)) : NULL); \
+               edge; \
+               (edge) = (ne), (ne) = ((edge) ? (get_irn_out_edge_next(irn, edge)) : NULL) \
+       )
+
+
 /**
  * A convenience iteration macro for all control flow edges
  * leaving a block, and thus are cf successor edges.