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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/MethodCallTargetNode.java @ 14746:7544068e1a91

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Perform de-virtualization of calls only in canonicalizer and not in graph builder
author Christian Wimmer <christian.wimmer@oracle.com>
date Tue, 25 Mar 2014 13:32:32 -0700
parents fd7fcd2d2072
children 8db6e76cb658
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1 /*
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2 * Copyright (c) 2011, 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.java;
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25 import java.lang.reflect.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.graph.*;
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29 import com.oracle.graal.graph.spi.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.type.*;
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32
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33 public class MethodCallTargetNode extends CallTargetNode implements IterableNodeType, Canonicalizable {
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34
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35 public enum InvokeKind {
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36 Interface, Special, Static, Virtual
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37 }
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38
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39 private final JavaType returnType;
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40 private ResolvedJavaMethod targetMethod;
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41 private InvokeKind invokeKind;
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42
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43 /**
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44 * @param arguments
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45 */
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46 public MethodCallTargetNode(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, ValueNode[] arguments, JavaType returnType) {
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47 super(arguments);
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48 this.invokeKind = invokeKind;
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49 this.returnType = returnType;
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50 this.targetMethod = targetMethod;
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51 }
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52
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53 /**
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54 * Gets the target method for this invocation instruction.
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55 *
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56 * @return the target method
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57 */
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58 public ResolvedJavaMethod targetMethod() {
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59 return targetMethod;
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60 }
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61
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62 public InvokeKind invokeKind() {
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63 return invokeKind;
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64 }
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65
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66 public void setInvokeKind(InvokeKind kind) {
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67 this.invokeKind = kind;
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68 }
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69
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70 public void setTargetMethod(ResolvedJavaMethod method) {
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71 targetMethod = method;
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72 }
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73
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74 /**
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75 * Gets the instruction that produces the receiver object for this invocation, if any.
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76 *
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77 * @return the instruction that produces the receiver object for this invocation if any,
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78 * {@code null} if this invocation does not take a receiver object
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79 */
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80 public ValueNode receiver() {
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81 return isStatic() ? null : arguments().get(0);
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82 }
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83
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84 /**
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85 * Checks whether this is an invocation of a static method.
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86 *
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87 * @return {@code true} if the invocation is a static invocation
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88 */
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89 public boolean isStatic() {
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90 return invokeKind() == InvokeKind.Static;
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91 }
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92
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93 public Kind returnKind() {
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94 return targetMethod().getSignature().getReturnKind();
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95 }
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96
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97 public Invoke invoke() {
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98 return (Invoke) this.usages().first();
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99 }
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100
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101 @Override
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102 public boolean verify() {
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103 assert usages().count() <= 1 : "call target may only be used by a single invoke";
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104 for (Node n : usages()) {
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105 assertTrue(n instanceof Invoke, "call target can only be used from an invoke (%s)", n);
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106 }
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107 if (invokeKind == InvokeKind.Special || invokeKind == InvokeKind.Static) {
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108 assertFalse(Modifier.isAbstract(targetMethod.getModifiers()), "special calls or static calls are only allowed for concrete methods (%s)", targetMethod);
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109 }
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110 if (invokeKind == InvokeKind.Static) {
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111 assertTrue(Modifier.isStatic(targetMethod.getModifiers()), "static calls are only allowed for static methods (%s)", targetMethod);
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112 } else {
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113 assertFalse(Modifier.isStatic(targetMethod.getModifiers()), "static calls are only allowed for non-static methods (%s)", targetMethod);
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114 }
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115 return super.verify();
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116 }
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117
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118 @Override
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119 public String toString(Verbosity verbosity) {
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120 if (verbosity == Verbosity.Long) {
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121 return super.toString(Verbosity.Short) + "(" + targetMethod() + ")";
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122 } else {
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123 return super.toString(verbosity);
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124 }
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125 }
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126
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127 @Override
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128 public Node canonical(CanonicalizerTool tool) {
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129 if (invokeKind == InvokeKind.Interface || invokeKind == InvokeKind.Virtual) {
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130 // attempt to devirtualize the call
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131
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132 // check for trivial cases (e.g. final methods, nonvirtual methods)
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133 if (targetMethod.canBeStaticallyBound()) {
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134 invokeKind = InvokeKind.Special;
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135 return this;
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136 }
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137
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138 // check if the exact type of the receiver can be determined
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139 ValueNode receiver = receiver();
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140 ResolvedJavaType exact = targetMethod.getDeclaringClass().asExactType();
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141 if (exact == null && ObjectStamp.isExactType(receiver)) {
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142 exact = ObjectStamp.typeOrNull(receiver);
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143 }
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144 if (exact != null) {
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145 // either the holder class is exact, or the receiver object has an exact type
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146 ResolvedJavaMethod exactMethod = exact.resolveMethod(targetMethod);
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147 if (exactMethod != null) {
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148 invokeKind = InvokeKind.Special;
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149 targetMethod = exactMethod;
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150 return this;
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151 }
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152 }
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153 }
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154 return this;
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155 }
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156
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157 @Override
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158 public Stamp returnStamp() {
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159 Kind returnKind = targetMethod.getSignature().getReturnKind();
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160 if (returnKind == Kind.Object && returnType instanceof ResolvedJavaType) {
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161 return StampFactory.declared((ResolvedJavaType) returnType);
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162 } else {
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163 return StampFactory.forKind(returnKind);
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164 }
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165 }
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166
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167 public JavaType returnType() {
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168 return returnType;
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169 }
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170
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171 @Override
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172 public String targetName() {
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173 if (targetMethod() == null) {
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174 return "??Invalid!";
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175 }
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9d864856336a support canonicalization of arraylength in ReadNode
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diff changeset
176 return MetaUtil.format("%h.%n", targetMethod());
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177 }
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178
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179 public static MethodCallTargetNode find(StructuredGraph graph, ResolvedJavaMethod method) {
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180 for (MethodCallTargetNode target : graph.getNodes(MethodCallTargetNode.class)) {
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fd7fcd2d2072 replaced == with .equals() for comparisons between JavaMethod/JavaField/JavaType values
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diff changeset
181 if (target.targetMethod.equals(method)) {
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182 return target;
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183 }
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184 }
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185 return null;
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186 }
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187 }