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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/Assumptions.java @ 7064:8d16b9b2c51e

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first part of refactoring the InliningPhase added control-flow sensitive inlining inlining requires an Assumption object so that HotSpot can keep track of the inlined methods
author Christian Haeubl <haeubl@ssw.jku.at>
date Thu, 22 Nov 2012 13:30:14 +0100
parents 92bc58dc5b5e
children 902f60aa20cc
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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 java.io.*;
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26 import java.util.*;
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27
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28 import com.oracle.graal.api.meta.*;
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29
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30 /**
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31 * Class for recording optimistic assumptions made during compilation.
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32 */
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33 public final class Assumptions implements Serializable, Iterable<Assumptions.Assumption> {
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34
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35 private static final long serialVersionUID = 5152062717588239131L;
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36
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37 /**
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38 * Abstract base class for assumptions.
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39 */
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40 public abstract static class Assumption implements Serializable {
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41
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42 private static final long serialVersionUID = -1936652569665112915L;
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43 }
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44
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45 /**
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46 * An assumption about a unique subtype of a given type.
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47 */
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48 public static final class ConcreteSubtype extends Assumption {
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49
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50 private static final long serialVersionUID = -1457173265437676252L;
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51
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52 /**
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53 * Type the assumption is made about.
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54 */
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55 public final ResolvedJavaType context;
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56
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57 /**
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58 * Assumed unique concrete sub-type of the context type.
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59 */
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60 public final ResolvedJavaType subtype;
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61
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62 public ConcreteSubtype(ResolvedJavaType context, ResolvedJavaType subtype) {
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63 this.context = context;
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64 this.subtype = subtype;
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65 }
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66
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67 @Override
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68 public int hashCode() {
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69 final int prime = 31;
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70 int result = 1;
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71 result = prime * result + context.hashCode();
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72 result = prime * result + subtype.hashCode();
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73 return result;
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74 }
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75
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76 @Override
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77 public boolean equals(Object obj) {
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78 if (obj instanceof ConcreteSubtype) {
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79 ConcreteSubtype other = (ConcreteSubtype) obj;
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80 return other.context == context && other.subtype == subtype;
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81 }
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82 return false;
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83 }
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84 }
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85
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86 /**
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87 * An assumption about a unique implementation of a virtual method.
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88 */
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89 public static final class ConcreteMethod extends Assumption {
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90
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91 private static final long serialVersionUID = -7636746737947390059L;
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92
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93 /**
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94 * A virtual (or interface) method whose unique implementation for the receiver type
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95 * in {@link #context} is {@link #impl}.
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96 */
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97 public final ResolvedJavaMethod method;
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98
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99 /**
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100 * A receiver type.
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101 */
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102 public final ResolvedJavaType context;
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103
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104 /**
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105 * The unique implementation of {@link #method} for {@link #context}.
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106 */
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107 public final ResolvedJavaMethod impl;
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108
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109 public ConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType context, ResolvedJavaMethod impl) {
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110 this.method = method;
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111 this.context = context;
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112 this.impl = impl;
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113 }
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114
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115 @Override
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116 public int hashCode() {
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117 final int prime = 31;
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118 int result = 1;
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119 result = prime * result + method.hashCode();
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120 result = prime * result + context.hashCode();
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121 result = prime * result + impl.hashCode();
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122 return result;
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123 }
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124
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125 @Override
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126 public boolean equals(Object obj) {
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127 if (obj instanceof ConcreteMethod) {
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128 ConcreteMethod other = (ConcreteMethod) obj;
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129 return other.method == method && other.context == context && other.impl == impl;
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130 }
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131 return false;
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132 }
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133 }
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134
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135 /**
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136 * An assumption that specified that a method was used during the compilation.
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137 */
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138 public static final class MethodContents extends Assumption {
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139
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140 private static final long serialVersionUID = -4821594103928571659L;
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141
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142 public final ResolvedJavaMethod method;
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143
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144 public MethodContents(ResolvedJavaMethod method) {
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145 this.method = method;
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146 }
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147
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148 @Override
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149 public int hashCode() {
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150 final int prime = 31;
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151 int result = 1;
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152 result = prime * result + method.hashCode();
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153 return result;
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154 }
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155
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156 @Override
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157 public boolean equals(Object obj) {
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158 if (obj instanceof ConcreteMethod) {
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159 ConcreteMethod other = (ConcreteMethod) obj;
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160 return other.method == method;
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161 }
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162 return false;
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163 }
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164 }
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165
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166 /**
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167 * Array with the assumptions. This field is directly accessed from C++ code in the Graal/HotSpot implementation.
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168 */
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169 private Assumption[] list;
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170 private boolean useOptimisticAssumptions;
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171 private int count;
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172
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173 public Assumptions(boolean useOptimisticAssumptions) {
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174 this.useOptimisticAssumptions = useOptimisticAssumptions;
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175 }
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176
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177 /**
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178 * Returns whether any assumptions have been registered.
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179 * @return {@code true} if at least one assumption has been registered, {@code false} otherwise.
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180 */
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181 public boolean isEmpty() {
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182 return count == 0;
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183 }
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184
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185 public boolean useOptimisticAssumptions() {
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186 return useOptimisticAssumptions;
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187 }
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188
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189 @Override
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190 public Iterator<Assumption> iterator() {
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b6617d13ea44 Dropping Ci* prefixes. Some additional renamings in the api.code interface.
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191 return new Iterator<Assumptions.Assumption>() {
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192 int index;
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193 public void remove() {
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194 throw new UnsupportedOperationException();
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195 }
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196 public Assumption next() {
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197 if (index >= count) {
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198 throw new NoSuchElementException();
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199 }
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200 return list[index++];
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201 }
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202 public boolean hasNext() {
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203 return index < count;
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204 }
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205 };
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206 }
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207
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208 /**
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209 * Records an assumption that the specified type has no finalizable subclasses.
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210 *
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211 * @param receiverType the type that is assumed to have no finalizable subclasses
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212 * @return {@code true} if the assumption was recorded and can be assumed; {@code false} otherwise
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213 */
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214 public boolean recordNoFinalizableSubclassAssumption(ResolvedJavaType receiverType) {
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215 // TODO (thomaswue): Record that assumption correctly.
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216 assert useOptimisticAssumptions;
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217 return false;
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218 }
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219
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220 /**
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221 * Records that {@code subtype} is the only concrete subtype in the class hierarchy below {@code context}.
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222 * @param context the root of the subtree of the class hierarchy that this assumptions is about
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223 * @param subtype the one concrete subtype
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224 */
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225 public void recordConcreteSubtype(ResolvedJavaType context, ResolvedJavaType subtype) {
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226 assert useOptimisticAssumptions;
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227 record(new ConcreteSubtype(context, subtype));
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228 }
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229
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230 /**
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231 * Records that {@code impl} is the only possible concrete target for a virtual call to
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232 * {@code method} with a receiver of type {@code context}.
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233 *
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234 * @param method a method that is the target of a virtual call
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235 * @param context the receiver type of a call to {@code method}
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236 * @param impl the concrete method that is the only possible target for the virtual call
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237 */
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238 public void recordConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType context, ResolvedJavaMethod impl) {
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239 assert useOptimisticAssumptions;
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240 record(new ConcreteMethod(method, context, impl));
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241 }
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242
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243 /**
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244 * Records that {@code method} was used during the compilation.
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245 *
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246 * @param method a method whose contents were used
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247 */
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248 public void recordMethodContents(ResolvedJavaMethod method) {
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249 record(new MethodContents(method));
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250 }
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251
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252 private void record(Assumption assumption) {
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253 if (list == null) {
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254 list = new Assumption[4];
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255 } else {
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256 for (int i = 0; i < count; ++i) {
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diff changeset
257 if (assumption.equals(list[i])) {
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diff changeset
258 return;
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259 }
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260 }
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261 }
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262 if (list.length == count) {
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263 Assumption[] newList = new Assumption[list.length * 2];
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264 for (int i = 0; i < list.length; ++i) {
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265 newList[i] = list[i];
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266 }
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267 list = newList;
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268 }
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269 list[count] = assumption;
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270 count++;
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271 }
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272
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273 }