Mercurial > hg > graal-compiler
annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/MethodIdMap.java @ 21623:d2113f5ae550
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author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 31 May 2015 23:58:09 +0200 |
parents | 48c1ebd24120 |
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1 /* |
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2 * Copyright (c) 2015, 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.jvmci.meta; |
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24 |
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25 import java.lang.reflect.*; |
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26 import java.util.*; |
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27 import java.util.function.*; |
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28 import java.util.stream.*; |
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29 |
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30 import com.oracle.jvmci.meta.MethodIdHolder.MethodIdAllocator; |
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31 |
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32 /** |
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33 * A map whose keys are {@link MethodIdHolder}s. This data structure can be used for mapping |
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34 * identifiers to methods without requiring eager resolution of the latter (e.g., to |
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35 * {@link ResolvedJavaMethod}s) and has retrieval as fast as array indexing. The constraints on |
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36 * using such a map are: |
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37 * <ul> |
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38 * <li>at most one value can be added for any key</li> |
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39 * <li>no more entries can be added after the first {@linkplain #get(MethodIdHolder) retrieval}</li> |
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40 * </ul> |
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41 * |
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42 * @param <V> the type of the values in the map |
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43 */ |
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44 public class MethodIdMap<V> { |
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45 |
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46 /** |
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47 * Key for a method. |
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48 */ |
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49 public static class MethodKey<T> { |
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50 final boolean isStatic; |
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51 final Class<?> declaringClass; |
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52 final String name; |
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53 final Class<?>[] argumentTypes; |
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54 final T value; |
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55 int id; |
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56 |
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57 MethodKey(T data, boolean isStatic, Class<?> declaringClass, String name, Class<?>... argumentTypes) { |
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58 assert isStatic || argumentTypes[0] == declaringClass; |
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59 this.value = data; |
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60 this.isStatic = isStatic; |
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61 this.declaringClass = declaringClass; |
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62 this.name = name; |
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63 this.argumentTypes = argumentTypes; |
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64 assert resolveJava() != null; |
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65 } |
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66 |
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67 @Override |
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68 public boolean equals(Object obj) { |
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69 if (obj instanceof MethodKey) { |
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70 MethodKey<?> that = (MethodKey<?>) obj; |
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71 boolean res = this.name.equals(that.name) && this.declaringClass.equals(that.declaringClass) && Arrays.equals(this.argumentTypes, that.argumentTypes); |
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72 assert !res || this.isStatic == that.isStatic; |
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73 return res; |
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74 } |
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75 return false; |
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76 } |
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77 |
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78 public int getDeclaredParameterCount() { |
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79 return isStatic ? argumentTypes.length : argumentTypes.length - 1; |
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80 } |
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81 |
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82 @Override |
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83 public int hashCode() { |
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84 // Replay compilation mandates use of stable hash codes |
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85 return declaringClass.getName().hashCode() ^ name.hashCode(); |
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86 } |
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87 |
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88 private MethodIdHolder resolve(MetaAccessProvider metaAccess) { |
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89 return (MethodIdHolder) metaAccess.lookupJavaMethod(resolveJava()); |
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90 } |
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91 |
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92 private Executable resolveJava() { |
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93 try { |
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94 Executable res; |
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95 Class<?>[] parameterTypes = isStatic ? argumentTypes : Arrays.copyOfRange(argumentTypes, 1, argumentTypes.length); |
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96 if (name.equals("<init>")) { |
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97 res = declaringClass.getDeclaredConstructor(parameterTypes); |
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98 } else { |
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99 res = declaringClass.getDeclaredMethod(name, parameterTypes); |
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100 } |
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101 assert Modifier.isStatic(res.getModifiers()) == isStatic; |
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102 return res; |
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103 } catch (NoSuchMethodException | SecurityException e) { |
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104 throw new InternalError(e); |
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105 } |
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106 } |
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107 |
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108 @Override |
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109 public String toString() { |
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110 StringBuilder sb = new StringBuilder(declaringClass.getName()).append('.').append(name).append('('); |
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111 for (Class<?> p : argumentTypes) { |
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112 if (sb.charAt(sb.length() - 1) != '(') { |
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113 sb.append(", "); |
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114 } |
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115 sb.append(p.getSimpleName()); |
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116 } |
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117 return sb.append(')').toString(); |
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118 } |
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119 } |
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120 |
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121 private final MetaAccessProvider metaAccess; |
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122 |
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123 /** |
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124 * Initial list of entries. |
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125 */ |
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126 private final List<MethodKey<V>> registrations; |
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127 |
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128 /** |
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129 * Entry array that is initialized upon first call to {@link #get(MethodIdHolder)}. |
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130 * |
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131 * Note: this must be volatile since double-checked locking is used to initialize it |
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132 */ |
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133 private volatile V[] entries; |
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134 |
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135 /** |
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136 * The minimum {@linkplain MethodIdHolder#getMethodId() id} for a key in this map. |
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137 */ |
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138 private int minId = Integer.MAX_VALUE; |
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139 |
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140 public MethodIdMap(MetaAccessProvider metaAccess) { |
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141 this.metaAccess = metaAccess; |
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142 this.registrations = new ArrayList<>(INITIAL_CAPACITY); |
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143 } |
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144 |
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145 private static final int INITIAL_CAPACITY = 64; |
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146 |
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147 /** |
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148 * Adds an entry to this map for a specified method. |
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149 * |
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150 * @param value value to be associated with the specified method |
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151 * @param isStatic specifies if the method is static |
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152 * @param declaringClass the class declaring the method |
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153 * @param name the name of the method |
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154 * @param argumentTypes the argument types of the method. Element 0 of this array must be |
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155 * {@code declaringClass} iff the method is non-static. |
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156 * @return an object representing the method |
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157 */ |
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158 public MethodKey<V> put(V value, boolean isStatic, Class<?> declaringClass, String name, Class<?>... argumentTypes) { |
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159 assert isStatic || argumentTypes[0] == declaringClass; |
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160 MethodKey<V> methodKey = new MethodKey<>(value, isStatic, declaringClass, name, argumentTypes); |
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161 assert entries == null : "registration is closed"; |
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162 assert !registrations.contains(methodKey) : "a value is already registered for " + methodKey; |
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163 registrations.add(methodKey); |
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164 return methodKey; |
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165 } |
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166 |
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167 @SuppressWarnings("unchecked") |
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168 protected V[] allocateEntries(int length) { |
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169 return (V[]) new Object[length]; |
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170 } |
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171 |
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172 /** |
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173 * Determines if a method denoted by a given {@link MethodKey} is in this map. |
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174 */ |
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175 public boolean containsKey(MethodKey<V> key) { |
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176 return registrations.contains(key); |
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177 } |
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178 |
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179 public V get(MethodIdHolder method) { |
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180 if (entries == null) { |
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181 createEntries(); |
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182 } |
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183 |
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184 int id = method.getMethodId(); |
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185 int index = id - minId; |
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186 return index >= 0 && index < entries.length ? entries[index] : null; |
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187 } |
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188 |
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189 public void createEntries() { |
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190 // 'assignIds' synchronizes on a global lock which ensures thread safe |
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191 // allocation of identifiers across all MethodIdHolder objects |
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192 MethodIdHolder.assignIds(new Consumer<MethodIdAllocator>() { |
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193 |
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194 public void accept(MethodIdAllocator idAllocator) { |
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195 if (entries == null) { |
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196 if (registrations.isEmpty()) { |
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197 entries = allocateEntries(0); |
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198 } else { |
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199 int max = Integer.MIN_VALUE; |
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200 for (MethodKey<V> methodKey : registrations) { |
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201 MethodIdHolder m = methodKey.resolve(metaAccess); |
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202 int id = idAllocator.assignId(m); |
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203 if (id < minId) { |
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204 minId = id; |
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205 } |
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206 if (id > max) { |
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207 max = id; |
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208 } |
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209 methodKey.id = id; |
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210 } |
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211 |
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212 int length = (max - minId) + 1; |
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213 entries = allocateEntries(length); |
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214 for (MethodKey<V> m : registrations) { |
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215 int index = m.id - minId; |
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216 entries[index] = m.value; |
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217 } |
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218 } |
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219 } |
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220 } |
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221 }); |
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222 } |
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223 |
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224 @Override |
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225 public String toString() { |
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226 return registrations.stream().map(MethodKey::toString).collect(Collectors.joining(", ")); |
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227 } |
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228 |
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229 public MetaAccessProvider getMetaAccess() { |
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230 return metaAccess; |
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231 } |
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232 |
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233 public int size() { |
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234 return registrations.size(); |
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235 } |
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236 } |