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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiAssumptions.java @ 5507:dc71b06d09f8

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Moving classes from cri.ri to api.meta.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 07 Jun 2012 18:24:06 +0200
parents 2f2c6347fce4
children
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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.max.cri.ci;
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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 * Recorded assumption can be visited for subsequent processing using
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33 * an implementation of the {@link CiAssumptionProcessor} interface.
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34 */
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35 public final class CiAssumptions implements Serializable, Iterable<CiAssumptions.Assumption> {
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36
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37 private static final long serialVersionUID = 5152062717588239131L;
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38
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39 public abstract static class Assumption implements Serializable {
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40
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41 private static final long serialVersionUID = -1936652569665112915L;
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42 }
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43
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44 /**
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45 * An assumption about a unique subtype of a given type.
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46 */
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47 public static final class ConcreteSubtype extends Assumption {
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48
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49 private static final long serialVersionUID = -1457173265437676252L;
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50
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51 /**
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52 * Type the assumption is made about.
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53 */
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54 public final RiResolvedType context;
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55
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56 /**
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57 * Assumed unique concrete sub-type of the context type.
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58 */
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59 public final RiResolvedType subtype;
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60
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61 public ConcreteSubtype(RiResolvedType context, RiResolvedType subtype) {
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62 this.context = context;
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63 this.subtype = subtype;
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64 }
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65
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66 @Override
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67 public int hashCode() {
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68 final int prime = 31;
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69 int result = 1;
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70 result = prime * result + context.hashCode();
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71 result = prime * result + subtype.hashCode();
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72 return result;
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73 }
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74
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75 @Override
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76 public boolean equals(Object obj) {
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77 if (obj instanceof ConcreteSubtype) {
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78 ConcreteSubtype other = (ConcreteSubtype) obj;
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79 return other.context == context && other.subtype == subtype;
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80 }
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81 return false;
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82 }
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83 }
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84
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85 /**
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86 * An assumption about a unique implementation of a virtual method.
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87 */
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88 public static final class ConcreteMethod extends Assumption {
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89
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90 private static final long serialVersionUID = -7636746737947390059L;
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91
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92 /**
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93 * A virtual (or interface) method whose unique implementation for the receiver type
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94 * in {@link #context} is {@link #impl}.
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95 */
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96 public final RiResolvedMethod method;
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97
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98 /**
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99 * A receiver type.
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100 */
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101 public final RiResolvedType context;
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102
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103 /**
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104 * The unique implementation of {@link #method} for {@link #context}.
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105 */
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106 public final RiResolvedMethod impl;
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107
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108 public ConcreteMethod(RiResolvedMethod method, RiResolvedType context, RiResolvedMethod impl) {
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109 this.method = method;
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110 this.context = context;
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111 this.impl = impl;
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112 }
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113
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114 @Override
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115 public int hashCode() {
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116 final int prime = 31;
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117 int result = 1;
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118 result = prime * result + method.hashCode();
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119 result = prime * result + context.hashCode();
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120 result = prime * result + impl.hashCode();
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121 return result;
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122 }
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123
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124 @Override
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125 public boolean equals(Object obj) {
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126 if (obj instanceof ConcreteMethod) {
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127 ConcreteMethod other = (ConcreteMethod) obj;
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128 return other.method == method && other.context == context && other.impl == impl;
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129 }
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130 return false;
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131 }
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132 }
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133
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134 /**
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135 * An assumption that specified that a method was used during the compilation.
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136 */
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137 public static final class MethodContents extends Assumption {
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138
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139 private static final long serialVersionUID = -4821594103928571659L;
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140
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141 public final RiResolvedMethod method;
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142
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143 public MethodContents(RiResolvedMethod method) {
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144 this.method = method;
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145 }
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146
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147 @Override
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148 public int hashCode() {
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149 final int prime = 31;
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150 int result = 1;
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151 result = prime * result + method.hashCode();
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152 return result;
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153 }
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154
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155 @Override
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156 public boolean equals(Object obj) {
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157 if (obj instanceof ConcreteMethod) {
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158 ConcreteMethod other = (ConcreteMethod) obj;
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159 return other.method == method;
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160 }
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161 return false;
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162 }
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163 }
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164
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165 /**
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166 * Array with the assumptions. This field is directly accessed from C++ code in the Graal/HotSpot implementation.
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167 */
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168 private Assumption[] list;
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169
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170 private int count;
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171
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172 /**
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173 * Returns whether any assumptions have been registered.
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174 * @return {@code true} if at least one assumption has been registered, {@code false} otherwise.
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175 */
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176 public boolean isEmpty() {
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177 return count == 0;
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178 }
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179
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180 @Override
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181 public Iterator<Assumption> iterator() {
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182 return new Iterator<CiAssumptions.Assumption>() {
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183 int index;
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184 public void remove() {
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185 throw new UnsupportedOperationException();
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186 }
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187 public Assumption next() {
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188 if (index >= count) {
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189 throw new NoSuchElementException();
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190 }
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191 return list[index++];
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192 }
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193 public boolean hasNext() {
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194 return index < count;
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195 }
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196 };
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197 }
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198
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199 /**
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200 * Records an assumption that the specified type has no finalizable subclasses.
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201 *
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202 * @param receiverType the type that is assumed to have no finalizable subclasses
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203 * @return {@code true} if the assumption was recorded and can be assumed; {@code false} otherwise
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204 */
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205 @SuppressWarnings("static-method")
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206 public boolean recordNoFinalizableSubclassAssumption(RiResolvedType receiverType) {
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207 // TODO (thomaswue): Record that assumption correctly.
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208 return false;
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209 }
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210
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211 /**
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212 * Records that {@code subtype} is the only concrete subtype in the class hierarchy below {@code context}.
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213 * @param context the root of the subtree of the class hierarchy that this assumptions is about
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214 * @param subtype the one concrete subtype
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215 */
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216 public void recordConcreteSubtype(RiResolvedType context, RiResolvedType subtype) {
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217 record(new ConcreteSubtype(context, subtype));
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218 }
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219
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220 /**
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221 * Records that {@code impl} is the only possible concrete target for a virtual call to
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222 * {@code method} with a receiver of type {@code context}.
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223 *
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224 * @param method a method that is the target of a virtual call
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225 * @param context the receiver type of a call to {@code method}
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226 * @param impl the concrete method that is the only possible target for the virtual call
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227 */
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228 public void recordConcreteMethod(RiResolvedMethod method, RiResolvedType context, RiResolvedMethod impl) {
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229 record(new ConcreteMethod(method, context, impl));
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230 }
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231
4670
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232 /**
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233 * Records that {@code method} was used during the compilation.
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234 *
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235 * @param method a method whose contents were used
41034914e2ee add MethodContents assumption to fix debbugging issue
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diff changeset
236 */
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diff changeset
237 public void recordMethodContents(RiResolvedMethod method) {
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diff changeset
238 record(new MethodContents(method));
41034914e2ee add MethodContents assumption to fix debbugging issue
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239 }
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240
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diff changeset
241 private void record(Assumption assumption) {
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diff changeset
242 if (list == null) {
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diff changeset
243 list = new Assumption[4];
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diff changeset
244 } else {
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245 for (int i = 0; i < count; ++i) {
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diff changeset
246 if (assumption.equals(list[i])) {
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diff changeset
247 return;
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248 }
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249 }
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diff changeset
250 }
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parents:
diff changeset
251 if (list.length == count) {
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diff changeset
252 Assumption[] newList = new Assumption[list.length * 2];
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diff changeset
253 for (int i = 0; i < list.length; ++i) {
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diff changeset
254 newList[i] = list[i];
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255 }
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diff changeset
256 list = newList;
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diff changeset
257 }
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diff changeset
258 list[count] = assumption;
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diff changeset
259 count++;
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260 }
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261
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262 }