X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firedges.h;h=23c7a5d93ab18760f5ee98f453563371f849d890;hb=19f4dcc74aa67e5da2b4bea426f1b273cff26ac0;hp=90e618af3098cdd088954c0c836dab5f96f118cc;hpb=9e23e96c93cffaf51577ee32d796a80a2cceead8;p=libfirm

diff --git a/ir/ir/iredges.h b/ir/ir/iredges.h
index 90e618af3..23c7a5d93 100644
--- 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.