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annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/VirtualObject.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents 9e1235406b59
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2010, 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 jdk.vm.ci.code;
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24
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25 import java.util.Arrays;
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26 import java.util.Collections;
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27 import java.util.IdentityHashMap;
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28 import java.util.Set;
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29
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30 import jdk.vm.ci.meta.JavaKind;
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31 import jdk.vm.ci.meta.JavaValue;
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32 import jdk.vm.ci.meta.ResolvedJavaField;
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33 import jdk.vm.ci.meta.ResolvedJavaType;
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34
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35 /**
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36 * An instance of this class represents an object whose allocation was removed by escape analysis.
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37 * The information stored in the {@link VirtualObject} is used during deoptimization to recreate the
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38 * object.
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39 */
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40 public final class VirtualObject implements JavaValue {
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41
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42 private final ResolvedJavaType type;
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43 private JavaValue[] values;
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44 private JavaKind[] slotKinds;
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45 private final int id;
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46
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47 /**
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48 * Creates a new {@link VirtualObject} for the given type, with the given fields. If
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49 * {@code type} is an instance class then {@code values} provides the values for the fields
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50 * returned by {@link ResolvedJavaType#getInstanceFields(boolean) getInstanceFields(true)}. If
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51 * {@code type} is an array then the length of the values array determines the reallocated array
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52 * length.
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53 *
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54 * @param type the type of the object whose allocation was removed during compilation. This can
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55 * be either an instance of an array type.
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56 * @param id a unique id that identifies the object within the debug information for one
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57 * position in the compiled code.
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58 * @return a new {@link VirtualObject} instance.
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59 */
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60 public static VirtualObject get(ResolvedJavaType type, int id) {
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61 return new VirtualObject(type, id);
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62 }
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63
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64 private VirtualObject(ResolvedJavaType type, int id) {
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65 this.type = type;
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66 this.id = id;
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67 }
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68
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69 private static StringBuilder appendValue(StringBuilder buf, JavaValue value, Set<VirtualObject> visited) {
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70 if (value instanceof VirtualObject) {
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71 VirtualObject vo = (VirtualObject) value;
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72 buf.append("vobject:").append(vo.type.toJavaName(false)).append(':').append(vo.id);
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73 if (!visited.contains(vo)) {
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74 visited.add(vo);
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75 buf.append('{');
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76 if (vo.values == null) {
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77 buf.append("<uninitialized>");
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78 } else {
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79 if (vo.type.isArray()) {
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80 for (int i = 0; i < vo.values.length; i++) {
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81 if (i != 0) {
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82 buf.append(',');
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83 }
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84 buf.append(i).append('=');
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85 appendValue(buf, vo.values[i], visited);
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86 }
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87 } else {
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88 ResolvedJavaField[] fields = vo.type.getInstanceFields(true);
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89 assert fields.length == vo.values.length : vo.type + ", fields=" + Arrays.toString(fields) + ", values=" + Arrays.toString(vo.values);
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90 for (int i = 0; i < vo.values.length; i++) {
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91 if (i != 0) {
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92 buf.append(',');
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93 }
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94 buf.append(fields[i].getName()).append('=');
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95 appendValue(buf, vo.values[i], visited);
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96 }
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97 }
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98 }
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99 buf.append('}');
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100 }
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101 } else {
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102 buf.append(value);
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103 }
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104 return buf;
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105 }
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106
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107 @Override
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108 public String toString() {
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109 Set<VirtualObject> visited = Collections.newSetFromMap(new IdentityHashMap<VirtualObject, Boolean>());
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110 return appendValue(new StringBuilder(), this, visited).toString();
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111 }
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112
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113 /**
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114 * Returns the type of the object whose allocation was removed during compilation. This can be
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115 * either an instance of an array type.
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116 */
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117 public ResolvedJavaType getType() {
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118 return type;
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119 }
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120
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121 /**
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122 * Returns the array containing all the values to be stored into the object when it is
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123 * recreated. This field is intentional exposed as a mutable array that a compiler may modify
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124 * (e.g. during register allocation).
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125 */
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126 @SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "`values` is intentional mutable")//
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127 public JavaValue[] getValues() {
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128 return values;
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129 }
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130
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131 /**
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132 * Returns the kind of the value at {@code index}.
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133 */
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134 public JavaKind getSlotKind(int index) {
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135 return slotKinds[index];
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136 }
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137
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138 /**
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139 * Returns the unique id that identifies the object within the debug information for one
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140 * position in the compiled code.
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141 */
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142 public int getId() {
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143 return id;
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144 }
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145
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146 /**
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147 * Overwrites the current set of values with a new one.
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148 *
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149 * @param values an array containing all the values to be stored into the object when it is
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150 * recreated.
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151 * @param slotKinds an array containing the Java kinds of the values. This must have the same
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152 * length as {@code values}. This array is now owned by this object and must not be
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153 * mutated by the caller.
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154 */
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155 @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `slotKinds`")
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156 public void setValues(JavaValue[] values, JavaKind[] slotKinds) {
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157 assert values.length == slotKinds.length;
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158 this.values = values;
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159 this.slotKinds = slotKinds;
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160 }
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161
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162 @Override
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163 public int hashCode() {
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164 return 42 + type.hashCode();
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165 }
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166
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167 @Override
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168 public boolean equals(Object o) {
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169 if (o == this) {
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170 return true;
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171 }
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172 if (o instanceof VirtualObject) {
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173 VirtualObject l = (VirtualObject) o;
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174 if (!l.type.equals(type) || l.values.length != values.length) {
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175 return false;
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176 }
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177 for (int i = 0; i < values.length; i++) {
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178 /*
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179 * Virtual objects can form cycles. Calling equals() could therefore lead to
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180 * infinite recursion.
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181 */
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182 if (!same(values[i], l.values[i])) {
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183 return false;
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184 }
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185 }
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186 return true;
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187 }
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188 return false;
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189 }
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190
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191 private static boolean same(Object o1, Object o2) {
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192 return o1 == o2;
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193 }
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194 }