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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/BytecodePosition.java @ 6999:679e6584c177

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added ScopedDebugValue to add values of interest to hs_err crash logs
author Doug Simon <doug.simon@oracle.com>
date Wed, 21 Nov 2012 19:23:43 +0100
parents 69a8969dbf40
children 5e3d1a68664e
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1 /*
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2 * Copyright (c) 2009, 2011, 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 a code position, that is, a chain of inlined methods with bytecode
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31 * locations, that is communicated from the compiler to the runtime system. A code position
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32 * can be used by the runtime system to reconstruct a source-level stack trace
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33 * for exceptions and to create {@linkplain BytecodeFrame frames} for deoptimization.
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34 */
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35 public abstract class BytecodePosition implements Serializable {
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36
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37 private static final long serialVersionUID = 8633885274526033515L;
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38
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39 private final BytecodePosition caller;
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40 private final ResolvedJavaMethod method;
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41 private final int bci;
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42
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43 /**
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44 * Constructs a new object representing a given parent/caller, a given method, and a given BCI.
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45 *
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46 * @param caller the parent position
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47 * @param method the method
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48 * @param bci a BCI within the method
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49 */
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50 public BytecodePosition(BytecodePosition caller, ResolvedJavaMethod method, int bci) {
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51 assert method != null;
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52 this.caller = caller;
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53 this.method = method;
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54 this.bci = bci;
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55 }
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56
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57 /**
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58 * Converts this code position to a string representation.
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59 * @return a string representation of this code position
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60 */
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61 @Override
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62 public String toString() {
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63 return CodeUtil.append(new StringBuilder(100), this).toString();
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64 }
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65
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66 /**
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67 * Deep equality test.
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68 */
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69 @Override
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70 public boolean equals(Object obj) {
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71 if (obj == this) {
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72 return true;
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73 }
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74 if (obj instanceof BytecodePosition) {
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75 BytecodePosition other = (BytecodePosition) obj;
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76 if (other.getMethod().equals(getMethod()) && other.getBCI() == getBCI()) {
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77 if (getCaller() == null) {
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78 return other.getCaller() == null;
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79 }
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80 return getCaller().equals(other.getCaller());
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81 }
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82 }
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83 return false;
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84 }
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85
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86 @Override
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87 public int hashCode() {
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88 return getBCI();
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89 }
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90
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91 /**
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92 * @return The location within the method, as a bytecode index. The constant
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93 * {@code -1} may be used to indicate the location is unknown, for example
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94 * within code synthesized by the compiler.
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95 */
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96 public int getBCI() {
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97 return bci;
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98 }
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99
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100 /**
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101 * @return The runtime interface method for this position.
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102 */
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103 public ResolvedJavaMethod getMethod() {
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104 return method;
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105 }
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106
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107 /**
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108 * The position where this position has been called, {@code null} if none.
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109 */
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110 public BytecodePosition getCaller() {
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111 return caller;
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112 }
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113 }