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annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiFrame.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
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3733
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1 /*
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2 * Copyright (c) 2009, 2011, 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.sun.cri.ci;
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24
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25 import java.io.*;
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26
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27 import com.sun.cri.ri.*;
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28
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29 /**
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30 * Represents the Java bytecode frame state(s) at a given position
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31 * including {@link CiValue locations} where to find the local variables,
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32 * operand stack values and locked objects of the bytecode frame(s).
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33 */
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34 public class CiFrame extends CiCodePos implements Serializable {
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35 /**
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36 * An array of values representing how to reconstruct the state of the Java frame.
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37 * This is array is partitioned as follows:
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38 * <p>
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39 * <table border="1" cellpadding="5" frame="void", rules="all">
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40 * <tr><th>Start index (inclusive)</th><th>End index (exclusive)</th><th>Description</th></tr>
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41 * <tr><td>0</td> <td>numLocals</td> <td>Local variables</td></tr>
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42 * <tr><td>numLocals</td> <td>numLocals + numStack</td><td>Operand stack</td></tr>
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43 * <tr><td>numLocals + numStack</td><td>values.length</td> <td>Locked objects</td></tr>
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44 * </table>
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45 * <p>
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46 * Note that the number of locals and the number of stack slots may be smaller than the
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47 * maximum number of locals and stack slots as specified in the compiled method.
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48 */
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49 public final CiValue[] values;
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50
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51 /**
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52 * The number of locals in the values array.
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53 */
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54 public final int numLocals;
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55
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56 /**
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57 * The number of stack slots in the values array.
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58 */
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59 public final int numStack;
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60
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61 /**
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62 * The number of locks in the values array.
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63 */
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64 public final int numLocks;
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65
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66 public final boolean rethrowException;
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67
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68 /**
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69 * Creates a new frame object.
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70 *
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71 * @param caller the caller frame (which may be {@code null})
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72 * @param method the method
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73 * @param bci a BCI within the method
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74 * @param rethrowException specifies if the VM should re-throw the pending exception when deopt'ing using this frame
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75 * @param values the frame state {@link #values}
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76 * @param numLocals the number of local variables
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77 * @param numStack the depth of the stack
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78 * @param numLocks the number of locked objects
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79 */
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80 public CiFrame(CiFrame caller, RiResolvedMethod method, int bci, boolean rethrowException, CiValue[] values, int numLocals, int numStack, int numLocks) {
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81 super(caller, method, bci);
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82 assert values != null;
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83 this.rethrowException = rethrowException;
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84 this.values = values;
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85 this.numLocks = numLocks;
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86 this.numLocals = numLocals;
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87 this.numStack = numStack;
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88 assert !rethrowException || numStack == 1 : "must have exception on top of the stack";
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89 }
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90
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91 /**
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92 * Gets the value representing the specified local variable.
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93 * @param i the local variable index
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94 * @return the value that can be used to reconstruct the local's current value
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95 */
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96 public CiValue getLocalValue(int i) {
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97 return values[i];
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98 }
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99
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100 /**
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101 * Gets the value representing the specified stack slot.
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102 * @param i the stack index
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103 * @return the value that can be used to reconstruct the stack slot's current value
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104 */
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105 public CiValue getStackValue(int i) {
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106 return values[i + numLocals];
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107 }
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108
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109 /**
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110 * Gets the value representing the specified lock.
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111 * @param i the lock index
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112 * @return the value that can be used to reconstruct the lock's current value
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113 */
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114 public CiValue getLockValue(int i) {
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115 return values[i + numLocals + numStack];
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116 }
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117
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118 /**
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119 * Gets the caller of this frame.
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120 *
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121 * @return {@code null} if this frame has no caller
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122 */
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123 public CiFrame caller() {
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124 return (CiFrame) caller;
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125 }
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126
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127 /**
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128 * Deep equality test.
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129 */
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130 @Override
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131 public boolean equals(Object obj) {
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132 if (obj == this) {
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133 return true;
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134 }
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135 if (obj instanceof CiFrame) {
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136 CiFrame other = (CiFrame) obj;
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137 return equals(other, false, false);
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138 }
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139 return false;
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140 }
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141
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142 /**
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143 * Deep equality test.
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144 *
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145 * @param ignoreKinds if {@code true}, compares values but {@link CiValue#equalsIgnoringKind(CiValue) ignore} their kinds
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146 * @param ignoreNegativeBCIs if {@code true}, negative BCIs are treated as equal
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147 */
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148 public boolean equals(CiFrame other, boolean ignoreKinds, boolean ignoreNegativeBCIs) {
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149 if ((other.bci == bci || (ignoreNegativeBCIs && other.bci < 0 && bci < 0)) &&
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150 numLocals == other.numLocals &&
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151 numStack == other.numStack &&
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152 numLocks == other.numLocks &&
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153 values.length == other.values.length) {
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154
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155 if (ignoreKinds) {
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156 for (int i = 0; i < values.length; i++) {
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157 if (!values[i].equalsIgnoringKind(other.values[i])) {
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158 return false;
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159 }
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160 }
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161 } else {
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162 for (int i = 0; i < values.length; i++) {
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163 if (!values[i].equals(other.values[i])) {
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164 return false;
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165 }
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166 }
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167 }
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168 if (caller == null) {
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169 return other.caller == null;
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170 }
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171 if (other.caller == null) {
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172 return false;
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173 }
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174 return caller().equals(other.caller(), ignoreKinds, ignoreNegativeBCIs);
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175 }
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176 return false;
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177 }
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178
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179 @Override
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180 public String toString() {
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181 return CiUtil.append(new StringBuilder(100), this).toString();
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182 }
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183
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184 /**
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185 * Gets a copy of this frame but with an empty stack.
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186 */
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187 public CiFrame withEmptyStack() {
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188 if (numStack == 0) {
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189 return this;
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190 }
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191 CiValue[] values = new CiValue[numLocals + numLocks];
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192 System.arraycopy(this.values, 0, values, 0, numLocals);
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193 System.arraycopy(this.values, numLocals + numStack, values, numLocals, numLocks);
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194 return new CiFrame(caller(), method, bci, rethrowException, values, numLocals, 0, numLocks);
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195 }
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196 }