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annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/BytecodeFrame.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
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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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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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 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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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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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} {@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.
0b25b81414c9 Move various bci constants from FrameState (gral.nodes) to BytecodeFrame (graal.api.code)
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 14906
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124 */
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Gilles Duboscq <duboscq@ssw.jku.at>
parents: 14906
diff changeset
125 public static final int AFTER_EXCEPTION_BCI = -4;
0b25b81414c9 Move various bci constants from FrameState (gral.nodes) to BytecodeFrame (graal.api.code)
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126
0b25b81414c9 Move various bci constants from FrameState (gral.nodes) to BytecodeFrame (graal.api.code)
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 14906
diff changeset
127 /**
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parents: 14906
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128 * This BCI should be used for states that cannot be the target of a deoptimization, like
0b25b81414c9 Move various bci constants from FrameState (gral.nodes) to BytecodeFrame (graal.api.code)
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parents: 14906
diff changeset
129 * snippet frame states.
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parents: 14906
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130 */
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Gilles Duboscq <duboscq@ssw.jku.at>
parents: 14906
diff changeset
131 public static final int INVALID_FRAMESTATE_BCI = -6;
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132
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133 /**
21063
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134 * Determines if a given BCI matches one of the placeholder BCI constants defined in this class.
ae5710f20011 renamed BytecodeFrame.isSyntheticBci to isPlaceholderBci and added getPlaceholderBciName
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135 */
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Doug Simon <doug.simon@oracle.com>
parents: 21046
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136 public static boolean isPlaceholderBci(int bci) {
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137 return bci < 0;
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parents: 21046
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138 }
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Doug Simon <doug.simon@oracle.com>
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139
ae5710f20011 renamed BytecodeFrame.isSyntheticBci to isPlaceholderBci and added getPlaceholderBciName
Doug Simon <doug.simon@oracle.com>
parents: 21046
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140 /**
ae5710f20011 renamed BytecodeFrame.isSyntheticBci to isPlaceholderBci and added getPlaceholderBciName
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parents: 21046
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141 * Gets the name of a given placeholder BCI.
21046
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parents: 19783
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142 */
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143 public static String getPlaceholderBciName(int bci) {
ae5710f20011 renamed BytecodeFrame.isSyntheticBci to isPlaceholderBci and added getPlaceholderBciName
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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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Doug Simon <doug.simon@oracle.com>
parents: 21046
diff changeset
155 } else {
ae5710f20011 renamed BytecodeFrame.isSyntheticBci to isPlaceholderBci and added getPlaceholderBciName
Doug Simon <doug.simon@oracle.com>
parents: 21046
diff changeset
156 assert bci == BytecodeFrame.UNWIND_BCI;
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157 return "UNWIND_BCI";
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parents: 21046
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158 }
21046
d35d2ac04970 weakened check used by an assertion in the FrameStateAssignmentPhase
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parents: 19783
diff changeset
159 }
d35d2ac04970 weakened check used by an assertion in the FrameStateAssignmentPhase
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160
d35d2ac04970 weakened check used by an assertion in the FrameStateAssignmentPhase
Doug Simon <doug.simon@oracle.com>
parents: 19783
diff changeset
161 /**
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diff changeset
162 * Creates a new frame object.
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163 *
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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
7530
5e3d1a68664e applied mx eclipseformat to all Java files
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diff changeset
167 * @param rethrowException specifies if the VM should re-throw the pending exception when
5e3d1a68664e applied mx eclipseformat to all Java files
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parents: 5552
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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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parents:
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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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parents:
diff changeset
173 */
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parents: 19608
diff changeset
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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diff changeset
175 super(caller, method, bci);
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176 assert values != null;
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diff changeset
177 this.rethrowException = rethrowException;
5129
51111665eda6 Support for recording a leaf graph id for each deoptimization point in the debug info.
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parents: 4678
diff changeset
178 this.duringCall = duringCall;
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diff changeset
179 this.values = values;
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diff changeset
180 this.numLocals = numLocals;
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diff changeset
181 this.numStack = numStack;
5129
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parents: 4678
diff changeset
182 this.numLocks = numLocks;
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diff changeset
183 assert !rethrowException || numStack == 1 : "must have exception on top of the stack";
13929
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parents: 9900
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184 }
f191cac04605 add assert to check format of debug info
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parents: 9900
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185
f191cac04605 add assert to check format of debug info
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parents: 9900
diff changeset
186 /**
f191cac04605 add assert to check format of debug info
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parents: 9900
diff changeset
187 * Ensure that the frame state is formatted as expected by the JVM, with null or Illegal in the
f191cac04605 add assert to check format of debug info
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parents: 9900
diff changeset
188 * slot following a double word item. This should really be checked in FrameState itself but
13970
bbf84e85b775 Move BytecodeFrame validation into the HotSpot backend
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parents: 13929
diff changeset
189 * because of Word type rewriting and alternative backends that can't be done.
13929
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Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 9900
diff changeset
190 */
19732
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Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 19662
diff changeset
191 public boolean validateFormat(boolean derivedOk) {
16888
8f4150982bc3 validateFormat should validate caller too
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15263
diff changeset
192 if (caller() != null) {
19732
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Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 19662
diff changeset
193 caller().validateFormat(derivedOk);
16888
8f4150982bc3 validateFormat should validate caller too
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parents: 15263
diff changeset
194 }
13929
f191cac04605 add assert to check format of debug info
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parents: 9900
diff changeset
195 for (int i = 0; i < numLocals + numStack; i++) {
f191cac04605 add assert to check format of debug info
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parents: 9900
diff changeset
196 if (values[i] != null) {
f191cac04605 add assert to check format of debug info
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parents: 9900
diff changeset
197 Kind kind = values[i].getKind();
18913
51680f58e681 Clean up in Kind class. Introduce Kind#getSlotCount and Kind#needsTwoSlots methods.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 18342
diff changeset
198 if (kind.needsTwoSlots()) {
13929
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parents: 9900
diff changeset
199 assert values.length > i + 1 : String.format("missing second word %s", this);
19608
3349fe56e6e9 Small change to BytecodeFrame validation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 18913
diff changeset
200 assert values[i + 1] == null || values[i + 1].getKind() == Kind.Illegal : this;
13929
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parents: 9900
diff changeset
201 }
19732
6a3832494e24 Check for derived pointers before passing BytecodeFrame into HotSpot
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 19662
diff changeset
202 assert derivedOk || ValueUtil.isIllegal(values[i]) || !values[i].getLIRKind().isDerivedReference() : "Unexpected derived value: " + values[i];
13929
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parents: 9900
diff changeset
203 }
f191cac04605 add assert to check format of debug info
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 9900
diff changeset
204 }
f191cac04605 add assert to check format of debug info
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 9900
diff changeset
205 return true;
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diff changeset
206 }
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parents:
diff changeset
207
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
208 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
209 * Gets the value representing the specified local variable.
14906
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parents: 13970
diff changeset
210 *
3733
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diff changeset
211 * @param i the local variable index
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parents:
diff changeset
212 * @return the value that can be used to reconstruct the local's current value
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
213 */
19662
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parents: 19608
diff changeset
214 public Value getLocalValue(int i) {
3733
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diff changeset
215 return values[i];
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parents:
diff changeset
216 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
217
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
218 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
219 * Gets the value representing the specified stack slot.
14906
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Bernhard Urban <bernhard.urban@jku.at>
parents: 13970
diff changeset
220 *
3733
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parents:
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221 * @param i the stack index
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
222 * @return the value that can be used to reconstruct the stack slot's current value
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
223 */
19662
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Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 19608
diff changeset
224 public Value getStackValue(int i) {
3733
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parents:
diff changeset
225 return values[i + numLocals];
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parents:
diff changeset
226 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
227
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
228 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
229 * Gets the value representing the specified lock.
14906
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Bernhard Urban <bernhard.urban@jku.at>
parents: 13970
diff changeset
230 *
3733
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parents:
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231 * @param i the lock index
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
232 * @return the value that can be used to reconstruct the lock's current value
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
233 */
19662
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Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 19608
diff changeset
234 public Value getLockValue(int i) {
3733
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parents:
diff changeset
235 return values[i + numLocals + numStack];
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
236 }
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parents:
diff changeset
237
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parents:
diff changeset
238 /**
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parents:
diff changeset
239 * Gets the caller of this frame.
14906
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Bernhard Urban <bernhard.urban@jku.at>
parents: 13970
diff changeset
240 *
3733
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diff changeset
241 * @return {@code null} if this frame has no caller
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
242 */
5547
b6617d13ea44 Dropping Ci* prefixes. Some additional renamings in the api.code interface.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 5541
diff changeset
243 public BytecodeFrame caller() {
5552
69a8969dbf40 Reduce public fields in api.code project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 5547
diff changeset
244 return (BytecodeFrame) getCaller();
3733
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245 }
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parents:
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246
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parents:
diff changeset
247 @Override
18342
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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parents: 18189
diff changeset
248 public boolean equals(Object obj) {
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
diff changeset
249 if (this == obj) {
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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parents: 18189
diff changeset
250 return true;
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
diff changeset
251 }
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
diff changeset
252 if (obj instanceof BytecodeFrame && super.equals(obj)) {
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
diff changeset
253 BytecodeFrame that = (BytecodeFrame) obj;
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
diff changeset
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 &&
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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258 this.numLocks == that.numLocks &&
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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259 this.numStack == that.numStack &&
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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260 Arrays.equals(this.values, that.values)) {
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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261 return true;
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
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262 }
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
diff changeset
263 // @formatter:off
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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parents: 18189
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264 return true;
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
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parents: 18189
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265 }
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
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266 return false;
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
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267 }
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
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268
d60dd21329f2 implemented .equals() for CompilationResult and the objects it encapsulates
Doug Simon <doug.simon@oracle.com>
parents: 18189
diff changeset
269 @Override
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
270 public String toString() {
5547
b6617d13ea44 Dropping Ci* prefixes. Some additional renamings in the api.code interface.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 5541
diff changeset
271 return CodeUtil.append(new StringBuilder(100), this).toString();
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e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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272 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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273 }