001/* 002 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved. 003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 004 * 005 * This code is free software; you can redistribute it and/or modify it 006 * under the terms of the GNU General Public License version 2 only, as 007 * published by the Free Software Foundation. 008 * 009 * This code is distributed in the hope that it will be useful, but WITHOUT 010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 011 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 012 * version 2 for more details (a copy is included in the LICENSE file that 013 * accompanied this code). 014 * 015 * You should have received a copy of the GNU General Public License version 016 * 2 along with this work; if not, write to the Free Software Foundation, 017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 018 * 019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 020 * or visit www.oracle.com if you need additional information or have any 021 * questions. 022 */ 023package com.oracle.graal.nodes; 024 025import com.oracle.graal.graph.*; 026import com.oracle.graal.graph.spi.*; 027import com.oracle.graal.nodeinfo.*; 028 029@NodeInfo(allowedUsageTypes = {InputType.Association}) 030public final class LoopExitNode extends BeginStateSplitNode implements IterableNodeType { 031 032 public static final NodeClass<LoopExitNode> TYPE = NodeClass.create(LoopExitNode.class); 033 @Input(InputType.Association) LoopBeginNode loopBegin; 034 035 public LoopExitNode(LoopBeginNode loop) { 036 super(TYPE); 037 assert loop != null; 038 loopBegin = loop; 039 } 040 041 public LoopBeginNode loopBegin() { 042 return loopBegin; 043 } 044 045 @Override 046 public void simplify(SimplifierTool tool) { 047 Node prev = this.predecessor(); 048 while (tool.allUsagesAvailable() && prev instanceof BeginNode && prev.hasNoUsages()) { 049 AbstractBeginNode begin = (AbstractBeginNode) prev; 050 prev = prev.predecessor(); 051 graph().removeFixed(begin); 052 } 053 } 054}