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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/BytecodeFrame.java @ 9900:f6a792c8e3ec

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added documentation for BytecodeFrame.rethrowException
author Doug Simon <doug.simon@oracle.com>
date Thu, 06 Jun 2013 08:51:43 +0200
parents 0b646334c5f7
children f191cac04605
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1 /*
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2 * Copyright (c) 2009, 2012, 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.io.*;
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26
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27 import com.oracle.graal.api.meta.*;
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29 /**
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30 * Represents the Java bytecode frame state(s) at a given position including {@link Value locations}
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31 * where to find the local variables, operand stack values and locked objects of the bytecode
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32 * frame(s).
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33 */
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34 public class BytecodeFrame extends BytecodePosition implements Serializable {
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35
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36 private static final long serialVersionUID = -345025397165977565L;
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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>
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42 * <table 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
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87 * consumed. In this case, {@link #numStack == 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 * Creates a new frame object.
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98 *
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99 * @param caller the caller frame (which may be {@code null})
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100 * @param method the method
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101 * @param bci a BCI within the method
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102 * @param rethrowException specifies if the VM should re-throw the pending exception when
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103 * deopt'ing using this frame
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104 * @param values the frame state {@link #values}
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105 * @param numLocals the number of local variables
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106 * @param numStack the depth of the stack
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107 * @param numLocks the number of locked objects
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108 */
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109 public BytecodeFrame(BytecodeFrame caller, ResolvedJavaMethod method, int bci, boolean rethrowException, boolean duringCall, Value[] values, int numLocals, int numStack, int numLocks) {
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110 super(caller, method, bci);
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111 assert values != null;
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112 this.rethrowException = rethrowException;
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113 this.duringCall = duringCall;
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114 this.values = values;
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115 this.numLocals = numLocals;
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116 this.numStack = numStack;
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117 this.numLocks = numLocks;
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118 assert !rethrowException || numStack == 1 : "must have exception on top of the stack";
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119 }
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120
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121 /**
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122 * Gets the value representing the specified local variable.
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123 *
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124 * @param i the local variable index
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125 * @return the value that can be used to reconstruct the local's current value
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126 */
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127 public Value getLocalValue(int i) {
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128 return values[i];
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129 }
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130
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131 /**
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132 * Gets the value representing the specified stack slot.
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133 *
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134 * @param i the stack index
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135 * @return the value that can be used to reconstruct the stack slot's current value
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136 */
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137 public Value getStackValue(int i) {
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138 return values[i + numLocals];
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139 }
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140
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141 /**
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142 * Gets the value representing the specified lock.
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143 *
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144 * @param i the lock index
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145 * @return the value that can be used to reconstruct the lock's current value
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146 */
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147 public Value getLockValue(int i) {
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148 return values[i + numLocals + numStack];
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149 }
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150
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151 /**
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152 * Gets the caller of this frame.
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153 *
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154 * @return {@code null} if this frame has no caller
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155 */
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156 public BytecodeFrame caller() {
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157 return (BytecodeFrame) getCaller();
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158 }
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159
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160 @Override
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161 public String toString() {
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162 return CodeUtil.append(new StringBuilder(100), this).toString();
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163 }
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164 }