Mercurial > hg > graal-compiler
annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiFrame.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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children | bc8527f3071c |
rev | line source |
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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 } |