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annotate graal/com.oracle.graal.graphbuilderconf/src/com/oracle/graal/graphbuilderconf/MethodIdMap.java @ 21376:739d9d9bd2fc

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Allow closing of invocation plugin registry to prevent future modifications
author Christian Wimmer <christian.wimmer@oracle.com>
date Thu, 14 May 2015 16:00:20 -0700
parents dc58f4ca21c9
children 93c50cefb9e8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.graal.graphbuilderconf;
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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.graal.api.meta.*;
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31 import com.oracle.graal.compiler.common.*;
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32 import com.oracle.graal.graphbuilderconf.MethodIdHolder.MethodIdAllocator;
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33 import com.oracle.graal.nodes.*;
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34 import com.oracle.graal.nodes.type.*;
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35
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36 /**
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37 * A map whose keys are {@link MethodIdHolder}s that doesn't require eager resolution of
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38 * {@link ResolvedJavaMethod}s and has retrieval as fast as array indexing. The constraints on using
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39 * such a map are:
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40 * <ul>
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41 * <li>at most one value can be added for any key</li>
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42 * <li>no more entries can be added after the first {@linkplain #get(MethodIdHolder) retrieval}</li>
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43 * </ul>
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44 *
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45 * @param <V> the type of the values in the map
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46 */
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47 public class MethodIdMap<V> {
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48
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49 /**
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50 * The receiver in a non-static method. The class literal for this interface must be used with
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51 * {@link MethodIdMap#put(Object, Class, String, Class...)} to denote the receiver argument for
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52 * such a non-static method.
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53 */
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54 public interface Receiver {
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55 /**
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56 * Gets the receiver value, null checking it first if necessary.
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57 *
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58 * @return the receiver value with a {@linkplain StampTool#isPointerNonNull(ValueNode)
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59 * non-null} stamp
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60 */
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61 ValueNode get();
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62
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63 /**
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64 * Determines if the receiver is constant.
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65 */
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66 default boolean isConstant() {
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67 return false;
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68 }
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69 }
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70
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71 /**
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72 * Key for a method.
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73 */
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74 public static class MethodKey<T> {
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75 final boolean isStatic;
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76 final Class<?> declaringClass;
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77 final String name;
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78 final Class<?>[] argumentTypes;
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79 final T value;
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80 int id;
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81
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82 MethodKey(T data, Class<?> declaringClass, String name, Class<?>... argumentTypes) {
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83 this.value = data;
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84 this.isStatic = argumentTypes.length == 0 || argumentTypes[0] != Receiver.class;
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85 this.declaringClass = declaringClass;
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86 this.name = name;
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87 this.argumentTypes = argumentTypes;
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88 if (!isStatic) {
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89 argumentTypes[0] = declaringClass;
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90 }
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91 assert resolveJava() != null;
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92 }
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93
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94 @Override
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95 public boolean equals(Object obj) {
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96 if (obj instanceof MethodKey) {
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97 MethodKey<?> that = (MethodKey<?>) obj;
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98 boolean res = this.name.equals(that.name) && this.declaringClass.equals(that.declaringClass) && Arrays.equals(this.argumentTypes, that.argumentTypes);
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99 assert !res || this.isStatic == that.isStatic;
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100 return res;
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101 }
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102 return false;
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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 // Replay compilation mandates use of stable hash codes
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108 return declaringClass.getName().hashCode() ^ name.hashCode();
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109 }
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110
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111 private MethodIdHolder resolve(MetaAccessProvider metaAccess) {
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112 return (MethodIdHolder) metaAccess.lookupJavaMethod(resolveJava());
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113 }
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114
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115 private Executable resolveJava() {
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116 try {
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117 Executable res;
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118 Class<?>[] parameterTypes = isStatic ? argumentTypes : Arrays.copyOfRange(argumentTypes, 1, argumentTypes.length);
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119 if (name.equals("<init>")) {
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120 res = declaringClass.getDeclaredConstructor(parameterTypes);
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121 } else {
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122 res = declaringClass.getDeclaredMethod(name, parameterTypes);
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123 }
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124 assert Modifier.isStatic(res.getModifiers()) == isStatic;
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125 return res;
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126 } catch (NoSuchMethodException | SecurityException e) {
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127 throw new GraalInternalError(e);
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128 }
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129 }
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130
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131 @Override
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132 public String toString() {
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133 StringBuilder sb = new StringBuilder(declaringClass.getName()).append('.').append(name).append('(');
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134 for (Class<?> p : argumentTypes) {
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135 if (sb.charAt(sb.length() - 1) != '(') {
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136 sb.append(", ");
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137 }
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138 sb.append(p.getSimpleName());
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139 }
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140 return sb.append(')').toString();
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141 }
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142 }
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143
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144 private final MetaAccessProvider metaAccess;
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145
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146 /**
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147 * Initial list of entries.
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148 */
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149 private final List<MethodKey<V>> registrations;
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150
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151 /**
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152 * Entry array that is initialized upon first call to {@link #get(MethodIdHolder)}.
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153 *
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154 * Note: this must be volatile since double-checked locking is used to initialize it
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155 */
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156 private volatile V[] entries;
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157
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158 /**
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159 * The minimum {@linkplain MethodIdHolder#getMethodId() id} for a key in this map.
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160 */
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161 private int minId = Integer.MAX_VALUE;
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162
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163 public MethodIdMap(MetaAccessProvider metaAccess) {
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164 this.metaAccess = metaAccess;
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165 this.registrations = new ArrayList<>(INITIAL_CAPACITY);
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166 }
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167
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168 private static final int INITIAL_CAPACITY = 64;
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169
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170 /**
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171 * Adds an entry to this map for a specified method.
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172 *
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173 * @param value value to be associated with the specified method
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174 * @param declaringClass the class declaring the method
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175 * @param name the name of the method
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176 * @param argumentTypes the argument types of the method. Element 0 of this array must be the
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177 * {@link Class} value for {@link Receiver} iff the method is non-static.
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178 * @return an object representing the method
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179 */
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180 public MethodKey<V> put(V value, Class<?> declaringClass, String name, Class<?>... argumentTypes) {
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181 MethodKey<V> methodKey = new MethodKey<>(value, declaringClass, name, argumentTypes);
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182 assert entries == null : "registration is closed";
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183 assert !registrations.contains(methodKey) : "a value is already registered for " + methodKey;
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184 registrations.add(methodKey);
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185 return methodKey;
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186 }
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187
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188 @SuppressWarnings("unchecked")
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189 protected V[] allocateEntries(int length) {
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190 return (V[]) new Object[length];
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191 }
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192
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193 /**
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194 * Determines if a method denoted by a given {@link MethodKey} is in this map.
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195 */
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196 public boolean containsKey(MethodKey<V> key) {
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197 return registrations.contains(key);
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198 }
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199
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200 public V get(MethodIdHolder method) {
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201 if (entries == null) {
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202 createEntries();
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203 }
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204
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205 int id = method.getMethodId();
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206 int index = id - minId;
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207 return index >= 0 && index < entries.length ? entries[index] : null;
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208 }
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209
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210 public void createEntries() {
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211 // 'assignIds' synchronizes on a global lock which ensures thread safe
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212 // allocation of identifiers across all MethodIdHolder objects
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213 MethodIdHolder.assignIds(new Consumer<MethodIdAllocator>() {
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214
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215 public void accept(MethodIdAllocator idAllocator) {
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216 if (entries == null) {
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217 if (registrations.isEmpty()) {
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218 entries = allocateEntries(0);
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219 } else {
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220 int max = Integer.MIN_VALUE;
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221 for (MethodKey<V> methodKey : registrations) {
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222 MethodIdHolder m = methodKey.resolve(metaAccess);
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223 int id = idAllocator.assignId(m);
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224 if (id < minId) {
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225 minId = id;
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226 }
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227 if (id > max) {
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228 max = id;
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229 }
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230 methodKey.id = id;
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231 }
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232
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233 int length = (max - minId) + 1;
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234 entries = allocateEntries(length);
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235 for (MethodKey<V> m : registrations) {
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236 int index = m.id - minId;
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237 entries[index] = m.value;
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238 }
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239 }
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240 }
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241 }
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242 });
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243 }
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244
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245 @Override
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246 public String toString() {
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247 return registrations.stream().map(MethodKey::toString).collect(Collectors.joining(", "));
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248 }
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249
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250 public MetaAccessProvider getMetaAccess() {
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251 return metaAccess;
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252 }
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253
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254 public int size() {
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255 return registrations.size();
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256 }
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257 }