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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/VirtualObject.java @ 18734:61b6c57421c2

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Add cast to void to fix compilation warning. Contributed-by: vladimir.kozlov@oracle.com
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Fri, 19 Dec 2014 12:44:00 -0800
parents 56cc1a799a60
children f595e97626fd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2010, 2014, 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.api.code;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28
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29 /**
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30 * An instance of this class represents an object whose allocation was removed by escape analysis.
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31 * The information stored in the {@link VirtualObject} is used during deoptimization to recreate the
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32 * object.
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33 */
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34 public final class VirtualObject extends AbstractValue implements JavaValue {
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35
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36 private static final long serialVersionUID = -2907197776426346021L;
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37
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38 private final ResolvedJavaType type;
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39 private JavaValue[] values;
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40 private final int id;
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41
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42 /**
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43 * Creates a new {@link VirtualObject} for the given type, with the given fields. If
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44 * {@code type} is an instance class then {@code values} provides the values for the fields
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45 * returned by {@link ResolvedJavaType#getInstanceFields(boolean) getInstanceFields(true)}. If
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46 * {@code type} is an array then the length of the values array determines the reallocated array
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47 * length.
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48 *
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49 * @param type the type of the object whose allocation was removed during compilation. This can
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50 * be either an instance of an array type.
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51 * @param values an array containing all the values to be stored into the object when it is
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52 * recreated
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53 * @param id a unique id that identifies the object within the debug information for one
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54 * position in the compiled code.
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55 * @return a new {@link VirtualObject} instance.
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56 */
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57 public static VirtualObject get(ResolvedJavaType type, JavaValue[] values, int id) {
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58 return new VirtualObject(type, values, id);
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59 }
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60
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61 private VirtualObject(ResolvedJavaType type, JavaValue[] values, int id) {
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62 super(LIRKind.reference(Kind.Object));
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63 this.type = type;
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64 this.values = values;
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65 this.id = id;
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66 }
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67
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68 private static StringBuilder appendValue(StringBuilder buf, JavaValue value, Set<VirtualObject> visited) {
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69 if (value instanceof VirtualObject) {
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70 VirtualObject vo = (VirtualObject) value;
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71 buf.append("vobject:").append(vo.type.toJavaName(false)).append(':').append(vo.id);
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72 if (!visited.contains(vo)) {
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73 visited.add(vo);
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74 buf.append('{');
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75 if (vo.values == null) {
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76 buf.append("<uninitialized>");
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77 } else {
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78 if (vo.type.isArray()) {
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79 for (int i = 0; i < vo.values.length; i++) {
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80 if (i != 0) {
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81 buf.append(',');
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82 }
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83 buf.append(i).append('=');
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84 appendValue(buf, vo.values[i], visited);
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85 }
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86 } else {
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87 ResolvedJavaField[] fields = vo.type.getInstanceFields(true);
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88 assert fields.length == vo.values.length : vo.type + ", fields=" + Arrays.toString(fields) + ", values=" + Arrays.toString(vo.values);
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89 for (int i = 0; i < vo.values.length; i++) {
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90 if (i != 0) {
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91 buf.append(',');
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92 }
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93 buf.append(fields[i].getName()).append('=');
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94 appendValue(buf, vo.values[i], visited);
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95 }
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96 }
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97 }
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98 buf.append('}');
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99 }
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100 } else {
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101 buf.append(value);
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102 }
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103 return buf;
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104 }
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105
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106 @Override
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107 public String toString() {
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108 Set<VirtualObject> visited = Collections.newSetFromMap(new IdentityHashMap<VirtualObject, Boolean>());
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109 return appendValue(new StringBuilder(), this, visited).toString();
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110 }
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111
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112 /**
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113 * Returns the type of the object whose allocation was removed during compilation. This can be
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114 * either an instance of an array type.
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115 */
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116 public ResolvedJavaType getType() {
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117 return type;
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118 }
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119
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120 /**
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121 * Returns an array containing all the values to be stored into the object when it is recreated.
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122 */
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123 public JavaValue[] getValues() {
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124 return values;
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125 }
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126
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127 /**
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128 * Returns the unique id that identifies the object within the debug information for one
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129 * position in the compiled code.
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130 */
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131 public int getId() {
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132 return id;
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133 }
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134
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135 private static boolean checkValues(ResolvedJavaType type, JavaValue[] values) {
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136 if (values != null) {
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137 if (!type.isArray()) {
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138 ResolvedJavaField[] fields = type.getInstanceFields(true);
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139 int fieldIndex = 0;
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140 for (int i = 0; i < values.length; i++) {
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141 ResolvedJavaField field = fields[fieldIndex++];
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142 Kind valKind = values[i].getKind().getStackKind();
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143 if (field.getKind() == Kind.Object && values[i] instanceof Value) {
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144 assert ((Value) values[i]).getLIRKind().isReference(0) : field + ": " + valKind + " != " + field.getKind();
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145 } else {
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146 if ((valKind == Kind.Double || valKind == Kind.Long) && field.getKind() == Kind.Int) {
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147 assert fields[fieldIndex].getKind() == Kind.Int;
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148 fieldIndex++;
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149 } else {
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150 assert valKind == field.getKind().getStackKind() : field + ": " + valKind + " != " + field.getKind();
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151 }
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152 }
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153 }
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154 assert fields.length == fieldIndex : type + ": fields=" + Arrays.toString(fields) + ", field values=" + Arrays.toString(values);
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155 } else {
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156 Kind componentKind = type.getComponentType().getKind().getStackKind();
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157 if (componentKind == Kind.Object) {
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158 for (int i = 0; i < values.length; i++) {
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159 if (values[i] instanceof Value) {
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160 assert ((Value) values[i]).getLIRKind().isReference(0) : values[i].getKind() + " != " + componentKind;
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161 }
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162 }
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163 } else {
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164 for (int i = 0; i < values.length; i++) {
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165 assert values[i].getKind() == componentKind || componentKind.getBitCount() >= values[i].getKind().getBitCount() ||
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166 (componentKind == Kind.Int && values[i].getKind().getBitCount() >= Kind.Int.getBitCount()) : values[i].getKind() + " != " + componentKind;
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167 }
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168 }
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169 }
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170 }
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171 return true;
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172 }
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173
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174 /**
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175 * Overwrites the current set of values with a new one.
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176 *
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177 * @param values an array containing all the values to be stored into the object when it is
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178 * recreated.
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179 */
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180 public void setValues(JavaValue[] values) {
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181 assert checkValues(type, values);
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182 this.values = values;
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183 }
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184
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185 @Override
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186 public int hashCode() {
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187 return getLIRKind().hashCode() + type.hashCode();
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188 }
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189
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190 @Override
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191 public boolean equals(Object o) {
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192 if (o == this) {
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193 return true;
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194 }
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195 if (o instanceof VirtualObject) {
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196 VirtualObject l = (VirtualObject) o;
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197 if (!l.type.equals(type) || l.values.length != values.length) {
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198 return false;
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199 }
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200 for (int i = 0; i < values.length; i++) {
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201 /*
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202 * Virtual objects can form cycles. Calling equals() could therefore lead to
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203 * infinite recursion.
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204 */
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205 if (!same(values[i], l.values[i])) {
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206 return false;
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207 }
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208 }
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209 return true;
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210 }
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211 return false;
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212 }
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213
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214 private static boolean same(Object o1, Object o2) {
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215 return o1 == o2;
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216 }
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217 }