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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiFrame.java @ 4560:e43d36482d12

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Merge
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 10 Feb 2012 17:09:39 +0100
parents aaac4894175c
children a03f3fd16b22
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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.max.cri.ci;
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25 import java.io.*;
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26
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27 import com.oracle.max.cri.ri.*;
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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 private static final long serialVersionUID = -345025397165977565L;
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36
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37 /**
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38 * An array of values representing how to reconstruct the state of the Java frame.
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39 * This is array is partitioned as follows:
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40 * <p>
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41 * <table border="1" cellpadding="5" frame="void", rules="all">
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42 * <tr><th>Start index (inclusive)</th><th>End index (exclusive)</th><th>Description</th></tr>
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43 * <tr><td>0</td> <td>numLocals</td> <td>Local variables</td></tr>
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44 * <tr><td>numLocals</td> <td>numLocals + numStack</td><td>Operand stack</td></tr>
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45 * <tr><td>numLocals + numStack</td><td>values.length</td> <td>Locked objects</td></tr>
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46 * </table>
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47 * <p>
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48 * Note that the number of locals and the number of stack slots may be smaller than the
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49 * maximum number of locals and stack slots as specified in the compiled method.
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50 */
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51 public final CiValue[] values;
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52
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53 /**
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54 * The number of locals in the values array.
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55 */
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56 public final int numLocals;
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57
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58 /**
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59 * The number of stack slots in the values array.
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60 */
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61 public final int numStack;
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62
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63 /**
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64 * The number of locks in the values array.
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65 */
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66 public final int numLocks;
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67
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68 public final boolean rethrowException;
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69
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70 /**
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71 * Creates a new frame object.
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72 *
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73 * @param caller the caller frame (which may be {@code null})
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74 * @param method the method
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75 * @param bci a BCI within the method
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76 * @param rethrowException specifies if the VM should re-throw the pending exception when deopt'ing using this frame
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77 * @param values the frame state {@link #values}
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78 * @param numLocals the number of local variables
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79 * @param numStack the depth of the stack
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80 * @param numLocks the number of locked objects
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81 */
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82 public CiFrame(CiFrame caller, RiResolvedMethod method, int bci, boolean rethrowException, CiValue[] values, int numLocals, int numStack, int numLocks) {
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83 super(caller, method, bci);
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84 assert values != null;
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85 this.rethrowException = rethrowException;
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86 this.values = values;
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87 this.numLocks = numLocks;
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88 this.numLocals = numLocals;
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89 this.numStack = numStack;
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90 assert !rethrowException || numStack == 1 : "must have exception on top of the stack";
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91 }
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92
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93 /**
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94 * Gets the value representing the specified local variable.
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95 * @param i the local variable index
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96 * @return the value that can be used to reconstruct the local's current value
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97 */
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98 public CiValue getLocalValue(int i) {
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99 return values[i];
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100 }
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101
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102 /**
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103 * Gets the value representing the specified stack slot.
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104 * @param i the stack index
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105 * @return the value that can be used to reconstruct the stack slot's current value
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106 */
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107 public CiValue getStackValue(int i) {
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108 return values[i + numLocals];
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109 }
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110
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111 /**
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112 * Gets the value representing the specified lock.
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113 * @param i the lock index
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114 * @return the value that can be used to reconstruct the lock's current value
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115 */
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116 public CiValue getLockValue(int i) {
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117 return values[i + numLocals + numStack];
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118 }
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119
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120 /**
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121 * Gets the caller of this frame.
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122 *
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123 * @return {@code null} if this frame has no caller
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124 */
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125 public CiFrame caller() {
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126 return (CiFrame) caller;
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127 }
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128
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129 @Override
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130 public String toString() {
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131 return CiUtil.append(new StringBuilder(100), this).toString();
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132 }
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133 }