X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firedges.h;h=57b52e597977faf8f1d2ae0091f8ebc3d0d7f4a3;hb=23ea16875f38dc0c067cce24f64b5c70f3acc496;hp=d726ab289e9ef69a34af855665aadce0426d5134;hpb=c7daadaa26601179dd9edac254b2c7315378d2e8;p=libfirm

diff --git a/ir/ir/iredges.h b/ir/ir/iredges.h
index d726ab289..57b52e597 100644
--- a/ir/ir/iredges.h
+++ b/ir/ir/iredges.h
@@ -1,3 +1,13 @@
+/*
+ * Project:     libFIRM
+ * File name:   ir/ir/iredges.h
+ * Purpose:     Public header for the automatically updating outs.
+ * Author:      Sebastian Hack
+ * Created:     3.2.2005
+ * CVS-ID:      $Id$
+ * Copyright:   (c) 1998-2005 Universität Karlsruhe
+ * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
+ */
 
 /**
  * Public header for the automatically updating outs.
@@ -5,10 +15,10 @@
  * @date 3.2.2005
  */
 
-#ifndef _FIRM_EDGES_H
-#define _FIRM_EDGES_H
+#ifndef _FIRM_IR_EDGES_H
+#define _FIRM_IR_EDGES_H
 
-#include "irnode.h"
+#include "firm_types.h"
 
 #ifndef _IR_EDGE_TYPEDEF_
 #define _IR_EDGE_TYPEDEF_
@@ -40,13 +50,31 @@ const ir_edge_t *get_irn_out_edge_next(const ir_node *irn,
 
 /**
  * A convenience iteration macro over all out edges of a node.
- * @param irn The node.
- * @param edge An @c ir_edge_t pointer which shall be set to the current
+ * @param irn  The node.
+ * @param edge An ir_edge_t pointer which shall be set to the current
  * edge.
  */
 #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 ir_edge_t pointer which shall be set to the current
+ * edge.
+ * @param ne   The next edge, enables alteration safe edge 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.
@@ -77,6 +105,16 @@ int get_irn_n_edges(const ir_node *irn);
  */
 extern int get_edge_src_pos(const ir_edge_t *edge);
 
+/**
+ * Get the edge object of an outgoing edge at a node.
+ * @param   irg The graph, the node is in.
+ * @param   irn The node at which the edge originates.
+ * @param   pos The position of the edge.
+ * @return      The corresponding edge object or NULL,
+ *              if no such edge exists.
+ */
+const ir_edge_t *get_irn_edge(ir_graph *irg, const ir_node *irn, int pos);
+
 /**
  * Check, if the out edges are activated.
  * @param irg The graph.
@@ -96,4 +134,4 @@ extern void edges_activate(ir_graph *irg);
  */
 extern void edges_deactivate(ir_graph *irg);
 
-#endif /* _FIRM_EDGES_H */
+#endif /* _FIRM_IR_EDGES_H */