Mercurial > hg > graal-compiler
annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/BytecodeFrame.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 00:36:16 +0200 |
parents | graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/BytecodeFrame.java@082417ac43e4 |
children | f5b549811bac |
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1 /* |
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2 * Copyright (c) 2009, 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.jvmci.code; |
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24 |
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25 import com.oracle.jvmci.meta.Kind; |
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26 import com.oracle.jvmci.meta.ResolvedJavaMethod; |
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27 import com.oracle.jvmci.meta.Value; |
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28 import java.util.*; |
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29 |
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30 |
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31 /** |
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32 * Represents the Java bytecode frame state(s) at a given position including {@link Value locations} |
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33 * where to find the local variables, operand stack values and locked objects of the bytecode |
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34 * frame(s). |
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35 */ |
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36 public class BytecodeFrame extends BytecodePosition { |
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37 |
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38 /** |
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39 * An array of values representing how to reconstruct the state of the Java frame. This is array |
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40 * is partitioned as follows: |
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41 * <p> |
14906 | 42 * <table summary="" border="1" cellpadding="5" frame="void" rules="all"> |
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43 * <tr> |
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44 * <th>Start index (inclusive)</th> |
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45 * <th>End index (exclusive)</th> |
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46 * <th>Description</th> |
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47 * </tr> |
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48 * <tr> |
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49 * <td>0</td> |
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50 * <td>numLocals</td> |
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51 * <td>Local variables</td> |
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52 * </tr> |
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53 * <tr> |
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54 * <td>numLocals</td> |
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55 * <td>numLocals + numStack</td> |
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56 * <td>Operand stack</td> |
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57 * </tr> |
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58 * <tr> |
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59 * <td>numLocals + numStack</td> |
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60 * <td>values.length</td> |
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61 * <td>Locked objects</td> |
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62 * </tr> |
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63 * </table> |
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64 * <p> |
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65 * Note that the number of locals and the number of stack slots may be smaller than the maximum |
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66 * number of locals and stack slots as specified in the compiled method. |
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67 */ |
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68 public final Value[] values; |
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69 |
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70 /** |
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71 * The number of locals in the values array. |
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72 */ |
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73 public final int numLocals; |
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74 |
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75 /** |
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76 * The number of stack slots in the values array. |
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77 */ |
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78 public final int numStack; |
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79 |
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80 /** |
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81 * The number of locks in the values array. |
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82 */ |
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83 public final int numLocks; |
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84 |
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85 /** |
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86 * True if this is a position inside an exception handler before the exception object has been |
19543 | 87 * consumed. In this case, {@link #numStack} {@code == 1} and {@link #getStackValue(int) |
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88 * getStackValue(0)} is the location of the exception object. If deoptimization happens at this |
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89 * position, the interpreter will rethrow the exception instead of executing the bytecode |
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90 * instruction at this position. |
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91 */ |
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92 public final boolean rethrowException; |
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93 |
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94 public final boolean duringCall; |
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95 |
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96 /** |
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97 * This BCI should be used for frame states that are built for code with no meaningful BCI. |
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98 */ |
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99 public static final int UNKNOWN_BCI = -5; |
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100 |
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101 /** |
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102 * The BCI for exception unwind. This is synthetic code and has no representation in bytecode. |
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103 * In contrast with {@link #AFTER_EXCEPTION_BCI}, at this point, if the method is synchronized, |
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104 * the monitor is still held. |
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105 */ |
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106 public static final int UNWIND_BCI = -1; |
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107 |
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108 /** |
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109 * The BCI for the state before starting to execute a method. Note that if the method is |
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110 * synchronized, the monitor is not yet held. |
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111 */ |
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112 public static final int BEFORE_BCI = -2; |
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113 |
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114 /** |
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115 * The BCI for the state after finishing the execution of a method and returning normally. Note |
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116 * that if the method was synchronized the monitor is already released. |
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117 */ |
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118 public static final int AFTER_BCI = -3; |
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119 |
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120 /** |
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121 * The BCI for exception unwind. This is synthetic code and has no representation in bytecode. |
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122 * In contrast with {@link #UNWIND_BCI}, at this point, if the method is synchronized, the |
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123 * monitor is already released. |
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124 */ |
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125 public static final int AFTER_EXCEPTION_BCI = -4; |
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126 |
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127 /** |
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128 * This BCI should be used for states that cannot be the target of a deoptimization, like |
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129 * snippet frame states. |
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130 */ |
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131 public static final int INVALID_FRAMESTATE_BCI = -6; |
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132 |
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133 /** |
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134 * Determines if a given BCI matches one of the placeholder BCI constants defined in this class. |
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135 */ |
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136 public static boolean isPlaceholderBci(int bci) { |
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137 return bci < 0; |
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138 } |
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139 |
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140 /** |
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141 * Gets the name of a given placeholder BCI. |
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142 */ |
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143 public static String getPlaceholderBciName(int bci) { |
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144 assert isPlaceholderBci(bci); |
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145 if (bci == BytecodeFrame.AFTER_BCI) { |
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146 return "AFTER_BCI"; |
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147 } else if (bci == BytecodeFrame.AFTER_EXCEPTION_BCI) { |
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148 return "AFTER_EXCEPTION_BCI"; |
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149 } else if (bci == BytecodeFrame.INVALID_FRAMESTATE_BCI) { |
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150 return "INVALID_FRAMESTATE_BCI"; |
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151 } else if (bci == BytecodeFrame.BEFORE_BCI) { |
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152 return "BEFORE_BCI"; |
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153 } else if (bci == BytecodeFrame.UNKNOWN_BCI) { |
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154 return "UNKNOWN_BCI"; |
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155 } else { |
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156 assert bci == BytecodeFrame.UNWIND_BCI; |
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157 return "UNWIND_BCI"; |
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158 } |
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159 } |
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160 |
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161 /** |
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162 * Creates a new frame object. |
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164 * @param caller the caller frame (which may be {@code null}) |
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165 * @param method the method |
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166 * @param bci a BCI within the method |
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167 * @param rethrowException specifies if the VM should re-throw the pending exception when |
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168 * deopt'ing using this frame |
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169 * @param values the frame state {@link #values} |
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170 * @param numLocals the number of local variables |
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171 * @param numStack the depth of the stack |
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172 * @param numLocks the number of locked objects |
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173 */ |
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174 public BytecodeFrame(BytecodeFrame caller, ResolvedJavaMethod method, int bci, boolean rethrowException, boolean duringCall, Value[] values, int numLocals, int numStack, int numLocks) { |
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175 super(caller, method, bci); |
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176 assert values != null; |
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177 this.rethrowException = rethrowException; |
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178 this.duringCall = duringCall; |
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179 this.values = values; |
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180 this.numLocals = numLocals; |
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181 this.numStack = numStack; |
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182 this.numLocks = numLocks; |
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183 assert !rethrowException || numStack == 1 : "must have exception on top of the stack"; |
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184 } |
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185 |
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186 /** |
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187 * Ensure that the frame state is formatted as expected by the JVM, with null or Illegal in the |
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188 * slot following a double word item. This should really be checked in FrameState itself but |
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189 * because of Word type rewriting and alternative backends that can't be done. |
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190 */ |
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191 public boolean validateFormat(boolean derivedOk) { |
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192 if (caller() != null) { |
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193 caller().validateFormat(derivedOk); |
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194 } |
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195 for (int i = 0; i < numLocals + numStack; i++) { |
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196 if (values[i] != null) { |
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197 Kind kind = values[i].getKind(); |
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198 if (kind.needsTwoSlots()) { |
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199 assert values.length > i + 1 : String.format("missing second word %s", this); |
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200 assert values[i + 1] == null || values[i + 1].getKind() == Kind.Illegal : this; |
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201 } |
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202 assert derivedOk || ValueUtil.isIllegal(values[i]) || !values[i].getLIRKind().isDerivedReference() : "Unexpected derived value: " + values[i]; |
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203 } |
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204 } |
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205 return true; |
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206 } |
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207 |
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208 /** |
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209 * Gets the value representing the specified local variable. |
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211 * @param i the local variable index |
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212 * @return the value that can be used to reconstruct the local's current value |
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213 */ |
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214 public Value getLocalValue(int i) { |
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215 return values[i]; |
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216 } |
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217 |
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218 /** |
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219 * Gets the value representing the specified stack slot. |
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221 * @param i the stack index |
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222 * @return the value that can be used to reconstruct the stack slot's current value |
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223 */ |
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224 public Value getStackValue(int i) { |
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225 return values[i + numLocals]; |
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226 } |
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227 |
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228 /** |
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229 * Gets the value representing the specified lock. |
14906 | 230 * |
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231 * @param i the lock index |
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232 * @return the value that can be used to reconstruct the lock's current value |
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233 */ |
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234 public Value getLockValue(int i) { |
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235 return values[i + numLocals + numStack]; |
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236 } |
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237 |
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238 /** |
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239 * Gets the caller of this frame. |
14906 | 240 * |
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241 * @return {@code null} if this frame has no caller |
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242 */ |
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243 public BytecodeFrame caller() { |
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244 return (BytecodeFrame) getCaller(); |
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245 } |
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246 |
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247 @Override |
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248 public boolean equals(Object obj) { |
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249 if (this == obj) { |
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250 return true; |
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251 } |
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252 if (obj instanceof BytecodeFrame && super.equals(obj)) { |
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253 BytecodeFrame that = (BytecodeFrame) obj; |
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254 // @formatter:off |
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255 if (this.duringCall == that.duringCall && |
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256 this.rethrowException == that.rethrowException && |
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257 this.numLocals == that.numLocals && |
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258 this.numLocks == that.numLocks && |
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259 this.numStack == that.numStack && |
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260 Arrays.equals(this.values, that.values)) { |
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261 return true; |
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262 } |
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263 // @formatter:off |
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264 return true; |
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265 } |
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266 return false; |
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267 } |
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268 |
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269 @Override |
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270 public String toString() { |
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271 return CodeUtil.append(new StringBuilder(100), this).toString(); |
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272 } |
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273 } |