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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/Assumptions.java @ 8947:707b20dd9512

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draft call site target value assumption
author Andreas Woess <andreas.woess@jku.at>
date Tue, 09 Apr 2013 17:23:32 +0200
parents f3fcc94f7120
children 2979aaac95af
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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.api.code;
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24
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25 import static com.oracle.graal.api.meta.MetaUtil.*;
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26
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27 import java.io.*;
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28 import java.lang.invoke.*;
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29 import java.util.*;
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30
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31 import com.oracle.graal.api.meta.*;
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32
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33 /**
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34 * Class for recording optimistic assumptions made during compilation.
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35 */
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36 public final class Assumptions implements Serializable, Iterable<Assumptions.Assumption> {
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37
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38 private static final long serialVersionUID = 5152062717588239131L;
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39
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40 /**
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41 * Abstract base class for assumptions.
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42 */
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43 public abstract static class Assumption implements Serializable {
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44
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45 private static final long serialVersionUID = -1936652569665112915L;
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46 }
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47
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48 /**
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49 * An assumption about a unique subtype of a given type.
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50 */
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51 public static final class ConcreteSubtype extends Assumption {
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52
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53 private static final long serialVersionUID = -1457173265437676252L;
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54
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55 /**
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56 * Type the assumption is made about.
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57 */
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58 public final ResolvedJavaType context;
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59
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60 /**
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61 * Assumed unique concrete sub-type of the context type.
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62 */
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63 public final ResolvedJavaType subtype;
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64
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65 public ConcreteSubtype(ResolvedJavaType context, ResolvedJavaType subtype) {
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66 this.context = context;
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67 this.subtype = subtype;
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68 assert !subtype.isInterface() : subtype.toString() + " : " + context.toString();
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69 }
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70
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71 @Override
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72 public int hashCode() {
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73 final int prime = 31;
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74 int result = 1;
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75 result = prime * result + context.hashCode();
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76 result = prime * result + subtype.hashCode();
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77 return result;
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78 }
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79
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80 @Override
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81 public boolean equals(Object obj) {
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82 if (obj instanceof ConcreteSubtype) {
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83 ConcreteSubtype other = (ConcreteSubtype) obj;
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84 return other.context == context && other.subtype == subtype;
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85 }
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86 return false;
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87 }
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88
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89 @Override
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90 public String toString() {
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91 return "ConcreteSubtype[context=" + toJavaName(context) + ", subtype=" + toJavaName(subtype) + "]";
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92 }
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93 }
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94
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95 /**
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96 * An assumption about a unique implementation of a virtual method.
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97 */
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98 public static final class ConcreteMethod extends Assumption {
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99
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100 private static final long serialVersionUID = -7636746737947390059L;
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101
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102 /**
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103 * A virtual (or interface) method whose unique implementation for the receiver type in
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104 * {@link #context} is {@link #impl}.
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105 */
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106 public final ResolvedJavaMethod method;
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107
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108 /**
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109 * A receiver type.
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110 */
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111 public final ResolvedJavaType context;
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112
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113 /**
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114 * The unique implementation of {@link #method} for {@link #context}.
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115 */
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116 public final ResolvedJavaMethod impl;
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117
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118 public ConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType context, ResolvedJavaMethod impl) {
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119 this.method = method;
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120 this.context = context;
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121 this.impl = impl;
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122 }
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123
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124 @Override
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125 public int hashCode() {
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126 final int prime = 31;
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127 int result = 1;
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128 result = prime * result + method.hashCode();
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129 result = prime * result + context.hashCode();
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130 result = prime * result + impl.hashCode();
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131 return result;
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132 }
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133
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134 @Override
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135 public boolean equals(Object obj) {
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136 if (obj instanceof ConcreteMethod) {
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137 ConcreteMethod other = (ConcreteMethod) obj;
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138 return other.method == method && other.context == context && other.impl == impl;
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139 }
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140 return false;
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141 }
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142
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143 @Override
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144 public String toString() {
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145 return "ConcreteMethod[method=" + format("%H.%n(%p)", method) + ", context=" + toJavaName(context) + ", impl=" + format("%H.%n(%p)", impl) + "]";
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146 }
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147 }
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148
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149 /**
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150 * An assumption that specified that a method was used during the compilation.
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151 */
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152 public static final class MethodContents extends Assumption {
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153
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154 private static final long serialVersionUID = -4821594103928571659L;
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155
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156 public final ResolvedJavaMethod method;
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157
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158 public MethodContents(ResolvedJavaMethod method) {
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159 this.method = method;
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160 }
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161
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162 @Override
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163 public int hashCode() {
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164 final int prime = 31;
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165 int result = 1;
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166 result = prime * result + method.hashCode();
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167 return result;
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168 }
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169
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170 @Override
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171 public boolean equals(Object obj) {
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172 if (obj instanceof ConcreteMethod) {
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173 ConcreteMethod other = (ConcreteMethod) obj;
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174 return other.method == method;
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175 }
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176 return false;
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177 }
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178
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179 @Override
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180 public String toString() {
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181 return "MethodContents[method=" + format("%H.%n(%p)", method) + "]";
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182 }
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183 }
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184
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185 /**
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186 * Assumption that a call site's method handle did not change.
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187 */
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188 public static final class CallSiteTargetValue extends Assumption {
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189
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190 private static final long serialVersionUID = 1732459941784550371L;
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191
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192 public final CallSite callSite;
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193 public final MethodHandle methodHandle;
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194
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195 public CallSiteTargetValue(CallSite callSite, MethodHandle methodHandle) {
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196 this.callSite = callSite;
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197 this.methodHandle = methodHandle;
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198 }
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199
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200 @Override
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201 public int hashCode() {
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202 final int prime = 31;
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203 int result = 1;
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204 result = prime * result + callSite.hashCode();
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205 result = prime * result + methodHandle.hashCode();
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206 return result;
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207 }
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208
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209 @Override
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210 public boolean equals(Object obj) {
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211 if (obj instanceof CallSiteTargetValue) {
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212 CallSiteTargetValue other = (CallSiteTargetValue) obj;
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213 return other.callSite == callSite && other.methodHandle == methodHandle;
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214 }
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215 return false;
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216 }
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217
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218 @Override
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219 public String toString() {
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220 return "CallSiteTargetValue[callSite=" + callSite + ", methodHandle=" + methodHandle + "]";
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221 }
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222 }
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223
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224 /**
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225 * Array with the assumptions. This field is directly accessed from C++ code in the
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226 * Graal/HotSpot implementation.
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227 */
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228 private Assumption[] list;
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229 private boolean useOptimisticAssumptions;
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230 private int count;
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231
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232 public Assumptions(boolean useOptimisticAssumptions) {
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233 this.useOptimisticAssumptions = useOptimisticAssumptions;
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234 }
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235
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236 /**
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237 * Returns whether any assumptions have been registered.
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238 *
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239 * @return {@code true} if at least one assumption has been registered, {@code false} otherwise.
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240 */
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241 public boolean isEmpty() {
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242 return count == 0;
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243 }
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244
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245 public boolean useOptimisticAssumptions() {
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246 return useOptimisticAssumptions;
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247 }
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248
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249 @Override
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250 public Iterator<Assumption> iterator() {
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251 return new Iterator<Assumptions.Assumption>() {
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252
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253 int index;
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254
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255 public void remove() {
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256 throw new UnsupportedOperationException();
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257 }
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258
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259 public Assumption next() {
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260 if (index >= count) {
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261 throw new NoSuchElementException();
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262 }
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263 return list[index++];
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264 }
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265
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266 public boolean hasNext() {
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267 return index < count;
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268 }
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269 };
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270 }
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271
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272 /**
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273 * Records an assumption that the specified type has no finalizable subclasses.
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274 *
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275 * @param receiverType the type that is assumed to have no finalizable subclasses
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276 * @return {@code true} if the assumption was recorded and can be assumed; {@code false}
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277 * otherwise
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278 */
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279 public boolean recordNoFinalizableSubclassAssumption(ResolvedJavaType receiverType) {
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280 assert useOptimisticAssumptions;
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281 return false;
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282 }
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283
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284 /**
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285 * Records that {@code subtype} is the only concrete subtype in the class hierarchy below
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286 * {@code context}.
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287 *
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288 * @param context the root of the subtree of the class hierarchy that this assumptions is about
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289 * @param subtype the one concrete subtype
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290 */
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291 public void recordConcreteSubtype(ResolvedJavaType context, ResolvedJavaType subtype) {
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292 assert useOptimisticAssumptions;
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293 record(new ConcreteSubtype(context, subtype));
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294 }
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295
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296 /**
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297 * Records that {@code impl} is the only possible concrete target for a virtual call to
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298 * {@code method} with a receiver of type {@code context}.
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299 *
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300 * @param method a method that is the target of a virtual call
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301 * @param context the receiver type of a call to {@code method}
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302 * @param impl the concrete method that is the only possible target for the virtual call
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303 */
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304 public void recordConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType context, ResolvedJavaMethod impl) {
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305 assert useOptimisticAssumptions;
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306 record(new ConcreteMethod(method, context, impl));
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307 }
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308
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309 /**
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310 * Records that {@code method} was used during the compilation.
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311 *
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312 * @param method a method whose contents were used
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313 */
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314 public void recordMethodContents(ResolvedJavaMethod method) {
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315 record(new MethodContents(method));
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316 }
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317
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318 public void record(Assumption assumption) {
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319 if (list == null) {
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320 list = new Assumption[4];
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321 } else {
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322 for (int i = 0; i < count; ++i) {
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323 if (assumption.equals(list[i])) {
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324 return;
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325 }
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326 }
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327 }
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328 if (list.length == count) {
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329 Assumption[] newList = new Assumption[list.length * 2];
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330 for (int i = 0; i < list.length; ++i) {
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331 newList[i] = list[i];
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332 }
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333 list = newList;
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334 }
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335 list[count] = assumption;
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336 count++;
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337 }
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338
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339 }