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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/ProxyNode.java @ 11334:7f713aad89de

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Allow ProxyNode as a GuardingNode.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Fri, 16 Aug 2013 21:23:30 +0200
parents ae3d070ab223
children ccbbb7dbca69
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.oracle.graal.graph.Node.ValueNumberable;
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27 import com.oracle.graal.nodes.PhiNode.PhiType;
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28 import com.oracle.graal.nodes.calc.*;
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29 import com.oracle.graal.nodes.extended.*;
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30 import com.oracle.graal.nodes.spi.*;
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31
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32 /**
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33 * A value proxy that is inserted in the frame state of a loop exit for any value that is created
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34 * inside the loop (i.e. was not live on entry to the loop) and is (potentially) used after the
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35 * loop.
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36 */
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37 @NodeInfo(nameTemplate = "{p#type/s}Proxy")
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38 public class ProxyNode extends FloatingNode implements Node.IterableNodeType, ValueNumberable, Canonicalizable, Virtualizable, LIRLowerable, ValueProxy, GuardingNode {
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39
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40 @Input(notDataflow = true) private AbstractBeginNode proxyPoint;
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41 @Input private ValueNode value;
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42 private final PhiType type;
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43 private final Object identity;
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44
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45 public ProxyNode(ValueNode value, AbstractBeginNode exit, PhiType type, Object identity) {
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46 super(type == PhiType.Value ? value.stamp() : type.stamp);
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47 this.type = type;
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48 this.identity = identity;
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49 assert exit != null;
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50 this.proxyPoint = exit;
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51 this.value = value;
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52 }
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53
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54 public ValueNode value() {
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55 return value;
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56 }
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57
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58 @Override
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59 public boolean inferStamp() {
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60 return updateStamp(value.stamp());
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61 }
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62
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63 public AbstractBeginNode proxyPoint() {
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64 return proxyPoint;
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65 }
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66
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67 public PhiType type() {
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68 return type;
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69 }
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70
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71 public Object getIdentity() {
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72 assert type != PhiType.Value;
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73 return identity;
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74 }
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75
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76 @Override
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77 public boolean verify() {
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78 assert value != null;
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79 assert proxyPoint != null;
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80 return super.verify();
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81 }
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82
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83 @Override
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84 public void generate(LIRGeneratorTool generator) {
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85 assert type == PhiType.Memory;
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86 }
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87
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88 @Override
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89 public ValueNode canonical(CanonicalizerTool tool) {
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90 if (type == PhiType.Value && value.isConstant()) {
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91 return value;
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92 }
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93 return this;
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94 }
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95
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96 @Override
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97 public void virtualize(VirtualizerTool tool) {
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98 if (type == PhiType.Value) {
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99 State state = tool.getObjectState(value);
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100 if (state != null && state.getState() == EscapeState.Virtual) {
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101 tool.replaceWithVirtual(state.getVirtualObject());
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102 }
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103 }
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104 }
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105
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106 public static ProxyNode forValue(ValueNode value, AbstractBeginNode exit, StructuredGraph graph) {
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107 return graph.unique(new ProxyNode(value, exit, PhiType.Value, null));
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108 }
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109
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110 public static ProxyNode forMemory(ValueNode value, AbstractBeginNode exit, Object location, StructuredGraph graph) {
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111 return graph.unique(new ProxyNode(value, exit, PhiType.Memory, location));
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112 }
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113
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114 @Override
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115 public ValueNode getOriginalValue() {
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116 return value;
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117 }
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118
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119 public ValueNode asNode() {
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120 return this;
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121 }
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122 }