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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/ClassGetHubNode.java @ 20135:987b4c42aef9

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add GetClassNode and use it in a non-HotSpot specific InvocationPlugin for Object.getClass()
author Doug Simon <doug.simon@oracle.com>
date Thu, 02 Apr 2015 11:45:32 +0200
parents 8fc336a04d77
children a4aa2116cfe0
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1 /*
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2 * Copyright (c) 2014, 2014, 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.hotspot.replacements;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.compiler.common.calc.*;
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27 import com.oracle.graal.graph.*;
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28 import com.oracle.graal.graph.spi.*;
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29 import com.oracle.graal.hotspot.meta.*;
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30 import com.oracle.graal.hotspot.nodes.type.*;
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31 import com.oracle.graal.hotspot.word.*;
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32 import com.oracle.graal.nodeinfo.*;
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33 import com.oracle.graal.nodes.*;
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34 import com.oracle.graal.nodes.calc.*;
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35 import com.oracle.graal.nodes.extended.*;
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36 import com.oracle.graal.nodes.spi.*;
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37
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38 /**
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39 * Read {@code Class::_klass} to get the hub for a {@link java.lang.Class}. This node mostly exists
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40 * to replace {@code _klass._java_mirror._klass} with {@code _klass}. The constant folding could be
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41 * handled by
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42 * {@link ReadNode#canonicalizeRead(ValueNode, LocationNode, ValueNode, CanonicalizerTool)}.
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43 */
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44 @NodeInfo
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45 public final class ClassGetHubNode extends FloatingGuardedNode implements Lowerable, Canonicalizable, ConvertNode {
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46 public static final NodeClass<ClassGetHubNode> TYPE = NodeClass.create(ClassGetHubNode.class);
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47 @Input protected ValueNode clazz;
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48
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49 public ClassGetHubNode(ValueNode clazz) {
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50 this(clazz, null);
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51 }
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52
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53 public ClassGetHubNode(ValueNode clazz, ValueNode guard) {
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54 super(TYPE, KlassPointerStamp.klass(), (GuardingNode) guard);
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55 this.clazz = clazz;
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56 }
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57
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58 @Override
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59 public Node canonical(CanonicalizerTool tool) {
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60 if (hasNoUsages()) {
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61 return null;
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62 } else {
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63 if (clazz.isConstant()) {
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64 MetaAccessProvider metaAccess = tool.getMetaAccess();
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65 if (metaAccess != null) {
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66 ResolvedJavaType exactType = tool.getConstantReflection().asJavaType(clazz.asJavaConstant());
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67 if (exactType instanceof HotSpotResolvedObjectType) {
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68 HotSpotResolvedObjectType objectType = (HotSpotResolvedObjectType) exactType;
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69 ConstantNode cn = ConstantNode.forConstant(stamp(), objectType.getObjectHub(), metaAccess);
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70 return cn;
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71 } else if (exactType instanceof HotSpotResolvedPrimitiveType) {
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72 return ConstantNode.forConstant(stamp(), JavaConstant.NULL_POINTER, metaAccess);
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73 }
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74 }
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75 }
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76 if (clazz instanceof GetClassNode) {
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77 GetClassNode getClass = (GetClassNode) clazz;
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78 return new LoadHubNode(KlassPointerStamp.klass(), getClass.getObject(), null);
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79 }
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80 if (clazz instanceof HubGetClassNode) {
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81 // replace _klass._java_mirror._klass -> _klass
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82 return ((HubGetClassNode) clazz).getHub();
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83 }
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84 return this;
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85 }
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86 }
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87
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88 @Override
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89 public void lower(LoweringTool tool) {
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90 tool.getLowerer().lower(this, tool);
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91 }
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92
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93 @NodeIntrinsic
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94 public static native KlassPointer readClass(Class<?> clazz);
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95
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96 @NodeIntrinsic
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97 public static native KlassPointer readClass(Class<?> clazz, GuardingNode guard);
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98
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99 public ValueNode getValue() {
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100 return clazz;
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101 }
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102
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103 @Override
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104 public Constant convert(Constant c, ConstantReflectionProvider constantReflection) {
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105 ResolvedJavaType exactType = constantReflection.asJavaType(c);
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106 if (exactType instanceof HotSpotResolvedObjectType) {
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107 HotSpotResolvedObjectType objectType = (HotSpotResolvedObjectType) exactType;
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108 return objectType.getObjectHub();
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109 } else {
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110 assert exactType instanceof HotSpotResolvedPrimitiveType;
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111 return JavaConstant.NULL_POINTER;
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112 }
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113 }
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114
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115 @Override
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116 public Constant reverse(Constant c, ConstantReflectionProvider constantReflection) {
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117 assert !c.equals(JavaConstant.NULL_POINTER);
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118 ResolvedJavaType objectType = constantReflection.asJavaType(c);
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119 return objectType.getJavaClass();
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120 }
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121
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122 public boolean isLossless() {
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123 return false;
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124 }
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125
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126 @Override
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127 public boolean preservesOrder(Condition op, Constant value, ConstantReflectionProvider constantReflection) {
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128 assert op == Condition.EQ || op == Condition.NE;
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129 ResolvedJavaType exactType = constantReflection.asJavaType(value);
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130 return exactType instanceof HotSpotResolvedObjectType;
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131 }
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132
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133 }