Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiAssumptions.java @ 3733:e233f5660da4
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author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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children | bc8527f3071c |
rev | line source |
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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.sun.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.sun.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 public abstract static class Assumption implements Serializable { |
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38 } |
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39 |
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40 /** |
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41 * An assumption about a unique subtype of a given type. |
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42 */ |
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43 public static final class ConcreteSubtype extends Assumption { |
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44 /** |
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45 * Type the assumption is made about. |
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46 */ |
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47 public final RiResolvedType context; |
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48 |
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49 /** |
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50 * Assumed unique concrete sub-type of the context type. |
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51 */ |
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52 public final RiResolvedType subtype; |
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53 |
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54 public ConcreteSubtype(RiResolvedType context, RiResolvedType subtype) { |
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55 this.context = context; |
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56 this.subtype = subtype; |
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57 } |
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58 |
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59 @Override |
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60 public int hashCode() { |
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61 final int prime = 31; |
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62 int result = 1; |
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63 result = prime * result + context.hashCode(); |
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64 result = prime * result + subtype.hashCode(); |
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65 return result; |
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66 } |
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67 |
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68 @Override |
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69 public boolean equals(Object obj) { |
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70 if (obj instanceof ConcreteSubtype) { |
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71 ConcreteSubtype other = (ConcreteSubtype) obj; |
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72 return other.context == context && other.subtype == subtype; |
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73 } |
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74 return false; |
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75 } |
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76 } |
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77 |
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78 /** |
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79 * An assumption about a unique implementation of a virtual method. |
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80 */ |
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81 public static final class ConcreteMethod extends Assumption { |
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82 |
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83 /** |
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84 * A virtual (or interface) method whose unique implementation for the receiver type |
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85 * in {@link #context} is {@link #impl}. |
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86 */ |
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87 public final RiResolvedMethod method; |
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88 |
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89 /** |
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90 * A receiver type. |
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91 */ |
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92 public final RiResolvedType context; |
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93 |
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94 /** |
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95 * The unique implementation of {@link #method} for {@link #context}. |
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96 */ |
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97 public final RiResolvedMethod impl; |
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98 |
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99 public ConcreteMethod(RiResolvedMethod method, RiResolvedType context, RiResolvedMethod impl) { |
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100 this.method = method; |
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101 this.context = context; |
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102 this.impl = impl; |
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103 } |
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104 |
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105 @Override |
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106 public int hashCode() { |
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107 final int prime = 31; |
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108 int result = 1; |
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109 result = prime * result + method.hashCode(); |
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110 result = prime * result + context.hashCode(); |
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111 result = prime * result + impl.hashCode(); |
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112 return result; |
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113 } |
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114 |
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115 @Override |
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116 public boolean equals(Object obj) { |
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117 if (obj instanceof ConcreteMethod) { |
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118 ConcreteMethod other = (ConcreteMethod) obj; |
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119 return other.method == method && other.context == context && other.impl == impl; |
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120 } |
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121 return false; |
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122 } |
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123 } |
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124 |
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125 /** |
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126 * Array with the assumptions. This field is directly accessed from C++ code in the Graal/HotSpot implementation. |
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127 */ |
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128 private Assumption[] list; |
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129 |
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130 private int count; |
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131 |
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132 /** |
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133 * Returns whether any assumptions have been registered. |
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134 * @return {@code true} if at least one assumption has been registered, {@code false} otherwise. |
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135 */ |
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136 public boolean isEmpty() { |
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137 return count == 0; |
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138 } |
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139 |
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140 @Override |
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141 public Iterator<Assumption> iterator() { |
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142 return new Iterator<CiAssumptions.Assumption>() { |
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143 int index; |
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144 public void remove() { |
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145 throw new UnsupportedOperationException(); |
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146 } |
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147 public Assumption next() { |
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148 if (index >= count) { |
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149 throw new NoSuchElementException(); |
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150 } |
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151 return list[index++]; |
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152 } |
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153 public boolean hasNext() { |
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154 return index < count; |
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155 } |
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156 }; |
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157 } |
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158 |
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159 /** |
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160 * Records an assumption that the specified type has no finalizable subclasses. |
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161 * |
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162 * @param receiverType the type that is assumed to have no finalizable subclasses |
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163 * @return {@code true} if the assumption was recorded and can be assumed; {@code false} otherwise |
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164 */ |
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165 public boolean recordNoFinalizableSubclassAssumption(RiResolvedType receiverType) { |
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166 return false; |
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167 } |
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168 |
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169 /** |
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170 * Records that {@code subtype} is the only concrete subtype in the class hierarchy below {@code context}. |
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171 * @param context the root of the subtree of the class hierarchy that this assumptions is about |
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172 * @param subtype the one concrete subtype |
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173 */ |
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174 public void recordConcreteSubtype(RiResolvedType context, RiResolvedType subtype) { |
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175 record(new ConcreteSubtype(context, subtype)); |
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176 } |
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177 |
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178 /** |
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179 * Records that {@code impl} is the only possible concrete target for a virtual call to |
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180 * {@code method} with a receiver of type {@code context}. |
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181 * |
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182 * @param method a method that is the target of a virtual call |
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183 * @param context the receiver type of a call to {@code method} |
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184 * @param impl the concrete method that is the only possible target for the virtual call |
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185 */ |
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186 public void recordConcreteMethod(RiResolvedMethod method, RiResolvedType context, RiResolvedMethod impl) { |
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187 record(new ConcreteMethod(method, context, impl)); |
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188 } |
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189 |
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190 private void record(Assumption assumption) { |
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191 if (list == null) { |
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192 list = new Assumption[4]; |
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193 } else { |
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194 for (int i = 0; i < count; ++i) { |
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195 if (assumption.equals(list[i])) { |
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196 return; |
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197 } |
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198 } |
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199 } |
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200 if (list.length == count) { |
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201 Assumption[] newList = new Assumption[list.length * 2]; |
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202 for (int i = 0; i < list.length; ++i) { |
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203 newList[i] = list[i]; |
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204 } |
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205 list = newList; |
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206 } |
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207 list[count] = assumption; |
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208 count++; |
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209 } |
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210 |
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211 } |