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annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/BytecodePosition.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/BytecodePosition.java@877d718f3ab2
children f5b549811bac
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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.jvmci.code;
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24
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25 import com.oracle.jvmci.meta.ResolvedJavaMethod;
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26 import java.util.*;
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29 /**
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30 * Represents a code position, that is, a chain of inlined methods with bytecode locations, that is
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31 * communicated from the compiler to the runtime system. A code position can be used by the runtime
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32 * system to reconstruct a source-level stack trace for exceptions and to create
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33 * {@linkplain BytecodeFrame frames} for deoptimization.
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34 */
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35 public class BytecodePosition {
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36
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37 private final BytecodePosition caller;
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38 private final ResolvedJavaMethod method;
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39 private final int bci;
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40
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41 /**
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42 * Constructs a new object representing a given parent/caller, a given method, and a given BCI.
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43 *
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44 * @param caller the parent position
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45 * @param method the method
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46 * @param bci a BCI within the method
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47 */
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48 public BytecodePosition(BytecodePosition caller, ResolvedJavaMethod method, int bci) {
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49 assert method != null;
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50 this.caller = caller;
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51 this.method = method;
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52 this.bci = bci;
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53 }
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54
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55 /**
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56 * Converts this code position to a string representation.
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57 *
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58 * @return a string representation of this code position
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59 */
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60 @Override
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61 public String toString() {
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62 return CodeUtil.append(new StringBuilder(100), this).toString();
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63 }
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64
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65 /**
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66 * Deep equality test.
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67 */
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68 @Override
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69 public boolean equals(Object obj) {
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70 if (obj == this) {
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71 return true;
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72 }
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73 if (obj != null && getClass() == obj.getClass()) {
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74 BytecodePosition that = (BytecodePosition) obj;
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75 if (this.bci == that.bci && Objects.equals(this.getMethod(), that.getMethod()) && Objects.equals(this.caller, that.caller)) {
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76 return true;
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77 }
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78 }
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79 return false;
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80 }
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81
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82 @Override
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83 public int hashCode() {
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84 return getBCI();
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85 }
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86
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87 /**
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88 * @return The location within the method, as a bytecode index. The constant {@code -1} may be
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89 * used to indicate the location is unknown, for example within code synthesized by the
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90 * compiler.
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91 */
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92 public int getBCI() {
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93 return bci;
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94 }
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95
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96 /**
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97 * @return The runtime interface method for this position.
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98 */
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99 public ResolvedJavaMethod getMethod() {
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100 return method;
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101 }
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102
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103 /**
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104 * The position where this position has been called, {@code null} if none.
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105 */
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106 public BytecodePosition getCaller() {
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107 return caller;
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108 }
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109
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110 /**
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111 * Adds a caller to the current position returning the new position.
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112 */
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113 public BytecodePosition addCaller(BytecodePosition link) {
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114 if (getCaller() == null) {
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115 return new BytecodePosition(link, getMethod(), getBCI());
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116 } else {
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117 return new BytecodePosition(getCaller().addCaller(link), getMethod(), getBCI());
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118 }
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119 }
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120 }