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annotate c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/HotSpotConstantPool.java @ 2062:231bf6b9f5ad

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Added caching for constant pool entries.
author Thomas Wuerthinger <wuerthinger@ssw.jku.at>
date Sat, 22 Jan 2011 17:31:11 +0100
parents 3c0a889a176b
children e5ba25730d9b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2010 Sun Microsystems, Inc. All rights reserved.
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3 *
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4 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
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5 * that is described in this document. In particular, and without limitation, these intellectual property
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6 * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
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7 * more additional patents or pending patent applications in the U.S. and in other countries.
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8 *
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9 * U.S. Government Rights - Commercial software. Government users are subject to the Sun
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10 * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
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11 * supplements.
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12 *
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13 * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
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14 * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
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15 * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
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16 * U.S. and other countries.
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17 *
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18 * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
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19 * Company, Ltd.
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20 */
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21 package com.sun.hotspot.c1x;
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22
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23 import java.lang.reflect.*;
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24 import java.util.*;
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25
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26 import com.sun.cri.ri.*;
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27
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28 /**
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29 * Implementation of RiConstantPool for HotSpot.
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30 *
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31 * @author Thomas Wuerthinger, Lukas Stadler
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32 */
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33 public class HotSpotConstantPool extends CompilerObject implements RiConstantPool {
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34
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35 private final long vmId;
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36
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37 private final FastLRUIntCache<RiMethod> methodCache = new FastLRUIntCache<RiMethod>();
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38 private final FastLRUIntCache<RiField> fieldCache = new FastLRUIntCache<RiField>();
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39 private final FastLRUIntCache<RiType> typeCache = new FastLRUIntCache<RiType>();
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40
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41 public static class FastLRUIntCache<T> {
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42
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43 private static final int InitialCapacity = 4;
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44 private int lastKey;
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45 private T lastObject;
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46
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47 private int[] keys;
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48 private Object[] objects;
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49 private int count;
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50
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51 @SuppressWarnings("unchecked")
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52 private T access(int index) {
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53 return (T) objects[index];
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54 }
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55
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56 public T get(int key) {
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57 if (key == lastKey) {
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58 return lastObject;
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59 } else if (count > 1) {
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60 for (int i = 0; i < count; ++i) {
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61 if (keys[i] == key) {
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62 lastObject = access(i);
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63 lastKey = key;
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64 return lastObject;
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65 }
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66 }
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67 }
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68 return null;
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69 }
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70
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71 public void add(int key, T object) {
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72 count++;
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73 if (count == 1) {
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74 lastKey = key;
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75 lastObject = object;
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76 } else {
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77 ensureSize();
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78 keys[count - 1] = key;
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79 objects[count - 1] = object;
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80 if (count == 2) {
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81 keys[0] = lastKey;
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82 objects[0] = lastObject;
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83 }
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84 lastKey = key;
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85 lastObject = object;
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86 }
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87 }
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88
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89 private void ensureSize() {
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90 if (keys == null) {
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91 keys = new int[InitialCapacity];
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92 objects = new Object[InitialCapacity];
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93 } else if (count > keys.length) {
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94 keys = Arrays.copyOf(keys, keys.length * 2);
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95 objects = Arrays.copyOf(objects, objects.length * 2);
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96 }
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97 }
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98 }
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99
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100 public HotSpotConstantPool(long vmId) {
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101 this.vmId = vmId;
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102 }
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103
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104 @Override
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105 public Object lookupConstant(int cpi) {
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106 Object constant = Compiler.getVMEntries().RiConstantPool_lookupConstant(vmId, cpi);
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107 return constant;
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108 }
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109
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110 @Override
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111 public RiSignature lookupSignature(int cpi) {
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112 return Compiler.getVMEntries().RiConstantPool_lookupSignature(vmId, cpi);
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113 }
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114
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115 @Override
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116 public RiMethod lookupMethod(int cpi, int byteCode) {
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117 RiMethod result = methodCache.get(cpi);
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118 if (result == null) {
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119 result = Compiler.getVMEntries().RiConstantPool_lookupMethod(vmId, cpi, (byte) byteCode);
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120 methodCache.add(cpi, result);
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121 }
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122 return result;
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123 }
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124
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125 @Override
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126 public RiType lookupType(int cpi, int opcode) {
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127 RiType result = typeCache.get(cpi);
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128 if (result == null) {
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129 result = Compiler.getVMEntries().RiConstantPool_lookupType(vmId, cpi);
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130 typeCache.add(cpi, result);
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131 }
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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 RiField lookupField(int cpi, int opcode) {
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137 RiField result = fieldCache.get(cpi);
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138 if (result == null) {
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139 result = Compiler.getVMEntries().RiConstantPool_lookupField(vmId, cpi, (byte) opcode);
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140 fieldCache.add(cpi, result);
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141 }
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142 return result;
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143 }
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144 }