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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiFrame.java @ 5442:2fac5abf145f

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documentation on CiFrame.leafGraphId
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 25 May 2012 10:36:23 +0200
parents 51111665eda6
children 56860d3f9f39
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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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24
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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 /**
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69 * In case this frame state belongs to a deoptimization, the leafGraphId will contain the StructuredGraph.graphId() of the graph that originally introduced this deoptimization point.
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70 * This id is later on used by the runtime system to evict graphs from the graph cache when deoptimizations originating from them have been hit.
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71 */
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72 public final long leafGraphId;
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73
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74 public final boolean rethrowException;
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75
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76 public final boolean duringCall;
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77
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78 /**
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79 * Creates a new frame object.
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80 *
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81 * @param caller the caller frame (which may be {@code null})
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82 * @param method the method
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83 * @param bci a BCI within the method
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84 * @param rethrowException specifies if the VM should re-throw the pending exception when deopt'ing using this frame
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85 * @param values the frame state {@link #values}
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86 * @param numLocals the number of local variables
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87 * @param numStack the depth of the stack
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88 * @param numLocks the number of locked objects
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89 */
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90 public CiFrame(CiFrame caller, RiResolvedMethod method, int bci, boolean rethrowException, boolean duringCall, CiValue[] values, int numLocals, int numStack, int numLocks, long leafGraphId) {
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91 super(caller, method, bci);
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92 assert values != null;
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93 this.rethrowException = rethrowException;
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94 this.duringCall = duringCall;
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95 this.values = values;
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96 this.numLocals = numLocals;
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97 this.numStack = numStack;
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98 this.numLocks = numLocks;
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99 this.leafGraphId = leafGraphId;
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100 assert !rethrowException || numStack == 1 : "must have exception on top of the stack";
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101 }
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102
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103 /**
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104 * Gets the value representing the specified local variable.
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105 * @param i the local variable index
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106 * @return the value that can be used to reconstruct the local's current value
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107 */
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108 public CiValue getLocalValue(int i) {
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109 return values[i];
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110 }
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111
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112 /**
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113 * Gets the value representing the specified stack slot.
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114 * @param i the stack index
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115 * @return the value that can be used to reconstruct the stack slot's current value
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116 */
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117 public CiValue getStackValue(int i) {
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118 return values[i + numLocals];
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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 lock.
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123 * @param i the lock index
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124 * @return the value that can be used to reconstruct the lock's current value
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125 */
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126 public CiValue getLockValue(int i) {
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127 return values[i + numLocals + numStack];
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128 }
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129
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130 /**
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131 * Gets the caller of this frame.
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132 *
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133 * @return {@code null} if this frame has no caller
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134 */
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135 public CiFrame caller() {
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136 return (CiFrame) caller;
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137 }
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138
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139 @Override
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140 public String toString() {
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141 return CiUtil.append(new StringBuilder(100), this).toString();
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142 }
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143 }