Mercurial > hg > truffle
annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiAssumptions.java @ 4266:e2499e6d8aa7
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 11 Jan 2012 16:31:46 +0100 |
parents | aaac4894175c |
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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.max.cri.ri.*; |
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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 /** |
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38 * |
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39 */ |
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40 private static final long serialVersionUID = 5152062717588239131L; |
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41 |
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42 public abstract static class Assumption implements Serializable { |
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43 |
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44 /** |
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45 * |
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46 */ |
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47 private static final long serialVersionUID = -1936652569665112915L; |
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48 } |
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49 |
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50 /** |
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51 * An assumption about a unique subtype of a given type. |
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52 */ |
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53 public static final class ConcreteSubtype extends Assumption { |
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54 /** |
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55 * |
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56 */ |
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57 private static final long serialVersionUID = -1457173265437676252L; |
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58 |
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59 /** |
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60 * Type the assumption is made about. |
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61 */ |
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62 public final RiResolvedType context; |
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63 |
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64 /** |
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65 * Assumed unique concrete sub-type of the context type. |
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66 */ |
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67 public final RiResolvedType subtype; |
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68 |
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69 public ConcreteSubtype(RiResolvedType context, RiResolvedType subtype) { |
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70 this.context = context; |
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71 this.subtype = subtype; |
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72 } |
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73 |
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74 @Override |
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75 public int hashCode() { |
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76 final int prime = 31; |
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77 int result = 1; |
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78 result = prime * result + context.hashCode(); |
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79 result = prime * result + subtype.hashCode(); |
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80 return result; |
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81 } |
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82 |
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83 @Override |
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84 public boolean equals(Object obj) { |
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85 if (obj instanceof ConcreteSubtype) { |
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86 ConcreteSubtype other = (ConcreteSubtype) obj; |
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87 return other.context == context && other.subtype == subtype; |
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88 } |
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89 return false; |
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90 } |
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91 } |
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92 |
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93 /** |
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94 * An assumption about a unique implementation of a virtual method. |
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95 */ |
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96 public static final class ConcreteMethod extends Assumption { |
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97 |
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98 /** |
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99 * |
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100 */ |
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101 private static final long serialVersionUID = -7636746737947390059L; |
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102 |
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103 /** |
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104 * A virtual (or interface) method whose unique implementation for the receiver type |
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105 * in {@link #context} is {@link #impl}. |
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106 */ |
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107 public final RiResolvedMethod method; |
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108 |
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109 /** |
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110 * A receiver type. |
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111 */ |
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112 public final RiResolvedType context; |
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113 |
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114 /** |
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115 * The unique implementation of {@link #method} for {@link #context}. |
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116 */ |
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117 public final RiResolvedMethod impl; |
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118 |
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119 public ConcreteMethod(RiResolvedMethod method, RiResolvedType context, RiResolvedMethod impl) { |
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120 this.method = method; |
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121 this.context = context; |
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122 this.impl = impl; |
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123 } |
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124 |
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125 @Override |
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126 public int hashCode() { |
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127 final int prime = 31; |
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128 int result = 1; |
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129 result = prime * result + method.hashCode(); |
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130 result = prime * result + context.hashCode(); |
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131 result = prime * result + impl.hashCode(); |
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132 return result; |
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133 } |
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134 |
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135 @Override |
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136 public boolean equals(Object obj) { |
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137 if (obj instanceof ConcreteMethod) { |
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138 ConcreteMethod other = (ConcreteMethod) obj; |
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139 return other.method == method && other.context == context && other.impl == impl; |
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140 } |
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141 return false; |
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142 } |
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143 } |
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144 |
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145 /** |
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146 * Array with the assumptions. This field is directly accessed from C++ code in the Graal/HotSpot implementation. |
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147 */ |
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148 private Assumption[] list; |
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149 |
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150 private int count; |
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151 |
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152 /** |
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153 * Returns whether any assumptions have been registered. |
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154 * @return {@code true} if at least one assumption has been registered, {@code false} otherwise. |
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155 */ |
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156 public boolean isEmpty() { |
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157 return count == 0; |
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158 } |
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159 |
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160 @Override |
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161 public Iterator<Assumption> iterator() { |
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162 return new Iterator<CiAssumptions.Assumption>() { |
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163 int index; |
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164 public void remove() { |
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165 throw new UnsupportedOperationException(); |
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166 } |
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167 public Assumption next() { |
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168 if (index >= count) { |
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169 throw new NoSuchElementException(); |
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170 } |
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171 return list[index++]; |
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172 } |
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173 public boolean hasNext() { |
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174 return index < count; |
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175 } |
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176 }; |
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177 } |
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178 |
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179 /** |
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180 * Records an assumption that the specified type has no finalizable subclasses. |
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181 * |
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182 * @param receiverType the type that is assumed to have no finalizable subclasses |
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183 * @return {@code true} if the assumption was recorded and can be assumed; {@code false} otherwise |
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184 */ |
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185 @SuppressWarnings("static-method") |
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186 public boolean recordNoFinalizableSubclassAssumption(RiResolvedType receiverType) { |
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187 // TODO(tw): Record that assumption correctly. |
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188 return false; |
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189 } |
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190 |
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191 /** |
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192 * Records that {@code subtype} is the only concrete subtype in the class hierarchy below {@code context}. |
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193 * @param context the root of the subtree of the class hierarchy that this assumptions is about |
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194 * @param subtype the one concrete subtype |
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195 */ |
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196 public void recordConcreteSubtype(RiResolvedType context, RiResolvedType subtype) { |
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197 record(new ConcreteSubtype(context, subtype)); |
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198 } |
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199 |
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200 /** |
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201 * Records that {@code impl} is the only possible concrete target for a virtual call to |
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202 * {@code method} with a receiver of type {@code context}. |
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203 * |
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204 * @param method a method that is the target of a virtual call |
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205 * @param context the receiver type of a call to {@code method} |
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206 * @param impl the concrete method that is the only possible target for the virtual call |
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207 */ |
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208 public void recordConcreteMethod(RiResolvedMethod method, RiResolvedType context, RiResolvedMethod impl) { |
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209 record(new ConcreteMethod(method, context, impl)); |
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210 } |
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211 |
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212 private void record(Assumption assumption) { |
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213 if (list == null) { |
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214 list = new Assumption[4]; |
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215 } else { |
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216 for (int i = 0; i < count; ++i) { |
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217 if (assumption.equals(list[i])) { |
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218 return; |
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219 } |
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220 } |
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221 } |
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222 if (list.length == count) { |
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223 Assumption[] newList = new Assumption[list.length * 2]; |
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224 for (int i = 0; i < list.length; ++i) { |
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225 newList[i] = list[i]; |
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226 } |
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227 list = newList; |
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228 } |
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229 list[count] = assumption; |
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230 count++; |
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|
231 } |
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232 |
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233 } |