Mercurial > hg > truffle
annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiCodePos.java @ 4231:d713eaf4d288
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 05 Jan 2012 16:09:47 -0800 |
parents | aaac4894175c |
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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.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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28 |
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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 CiFrame frames} for deoptimization. |
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34 */ |
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35 public class CiCodePos implements Serializable { |
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36 /** |
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37 * |
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38 */ |
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39 private static final long serialVersionUID = 8633885274526033515L; |
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40 |
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41 /** |
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42 * The position where this position has been called, {@code null} if none. |
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43 */ |
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44 public final CiCodePos caller; |
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45 |
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46 /** |
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47 * The runtime interface method for this position. |
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48 */ |
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49 public final RiResolvedMethod method; |
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50 |
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51 /** |
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52 * The location within the method, as a bytecode index. The constant |
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53 * {@code -1} may be used to indicate the location is unknown, for example |
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54 * within code synthesized by the compiler. |
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55 */ |
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56 public final int bci; |
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57 |
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58 /** |
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59 * Constructs a new object representing a given parent/caller, a given method, and a given BCI. |
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60 * |
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61 * @param caller the parent position |
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62 * @param method the method |
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63 * @param bci a BCI within the method |
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64 */ |
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65 public CiCodePos(CiCodePos caller, RiResolvedMethod method, int bci) { |
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66 assert method != null; |
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67 this.caller = caller; |
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68 this.method = method; |
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69 this.bci = bci; |
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70 } |
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71 |
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72 /** |
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73 * Converts this code position to a string representation. |
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74 * @return a string representation of this code position |
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75 */ |
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76 @Override |
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77 public String toString() { |
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78 return CiUtil.append(new StringBuilder(100), this).toString(); |
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79 } |
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80 |
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81 /** |
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82 * Deep equality test. |
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83 */ |
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84 @Override |
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85 public boolean equals(Object obj) { |
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86 if (obj == this) { |
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87 return true; |
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88 } |
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89 if (obj instanceof CiCodePos) { |
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90 CiCodePos other = (CiCodePos) obj; |
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91 if (other.method.equals(method) && other.bci == bci) { |
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92 if (caller == null) { |
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93 return other.caller == null; |
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94 } |
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95 return caller.equals(other.caller); |
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96 } |
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97 } |
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98 return false; |
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99 } |
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100 |
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101 @Override |
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102 public int hashCode() { |
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103 return bci; |
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104 } |
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105 } |