1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.nodes; 24 25 import static org.graalvm.compiler.nodeinfo.InputType.Association; 26 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; 27 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; 28 29 import org.graalvm.compiler.core.common.type.Stamp; 30 import org.graalvm.compiler.graph.Node.ValueNumberable; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.nodeinfo.NodeInfo; 33 import org.graalvm.compiler.nodes.calc.FloatingNode; 34 import org.graalvm.compiler.nodes.extended.GuardingNode; 35 36 /** 37 * A proxy is inserted at loop exits for any value that is created inside the loop (i.e. was not 38 * live on entry to the loop) and is (potentially) used after the loop. 39 */ 40 @NodeInfo(cycles = CYCLES_0, size = SIZE_0) 41 public abstract class ProxyNode extends FloatingNode implements ValueNumberable { 42 43 public static final NodeClass<ProxyNode> TYPE = NodeClass.create(ProxyNode.class); 44 @Input(Association) LoopExitNode loopExit; 45 46 protected ProxyNode(NodeClass<? extends ProxyNode> c, Stamp stamp, LoopExitNode proxyPoint) { 47 super(c, stamp); 48 assert proxyPoint != null; 49 this.loopExit = proxyPoint; 50 } 51 52 public abstract ValueNode value(); 53 54 public LoopExitNode proxyPoint() { 55 return loopExit; 56 } 57 58 @Override 59 public boolean verify() { 60 assert !(value() instanceof ProxyNode) || ((ProxyNode) value()).loopExit != loopExit; 61 return super.verify(); 62 } 63 64 public static ValueProxyNode forValue(ValueNode value, LoopExitNode exit, StructuredGraph graph) { 65 return graph.unique(new ValueProxyNode(value, exit)); 66 } 67 68 public static GuardProxyNode forGuard(GuardingNode value, LoopExitNode exit, StructuredGraph graph) { 69 return graph.unique(new GuardProxyNode(value, exit)); 70 } 71 }