# HG changeset patch
# User Bernhard Urban <bernhard.urban@jku.at>
# Date 1377792140 -7200
# Node ID ff122ed4b9fd1cf9f40b0672afd81141db2cd0de
# Parent  2da44804f720bdaffd84a1eed47131e8ce680c79
LoweringPhase: insert begin node to make lowering more robust, if the predecessor is not a FixedWithNextNode anymore

fixes GRAAL-436 in a nicer way

diff -r 2da44804f720 -r ff122ed4b9fd graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LoweringPhase.java
--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LoweringPhase.java	Thu Aug 29 17:28:22 2013 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LoweringPhase.java	Thu Aug 29 18:02:20 2013 +0200
@@ -248,11 +248,14 @@
                     break;
                 } else {
                     Node nextLastFixed = nextNode.predecessor();
-                    if (nextLastFixed instanceof FixedWithNextNode) {
-                        loweringTool.setLastFixedNode((FixedWithNextNode) nextLastFixed);
-                    } else {
-                        loweringTool.setLastFixedNode((FixedWithNextNode) nextNode);
+                    if (!(nextLastFixed instanceof FixedWithNextNode)) {
+                        // insert begin node, to have a valid last fixed for next lowerable node.
+                        BeginNode begin = node.graph().add(new BeginNode());
+                        nextLastFixed.replaceFirstSuccessor(nextNode, begin);
+                        begin.setNext(nextNode);
+                        nextLastFixed = begin;
                     }
+                    loweringTool.setLastFixedNode((FixedWithNextNode) nextLastFixed);
                 }
             }
         }