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annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiCodePos.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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children bc8527f3071c
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3733
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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.sun.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.sun.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 * The position where this position has been called, {@code null} if none.
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38 */
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39 public final CiCodePos caller;
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40
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41 /**
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42 * The runtime interface method for this position.
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43 */
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44 public final RiResolvedMethod method;
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45
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46 /**
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47 * The location within the method, as a bytecode index. The constant
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48 * {@code -1} may be used to indicate the location is unknown, for example
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49 * within code synthesized by the compiler.
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50 */
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51 public final int bci;
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52
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53 /**
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54 * Constructs a new object representing a given parent/caller, a given method, and a given BCI.
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55 *
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56 * @param caller the parent position
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57 * @param method the method
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58 * @param bci a BCI within the method
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59 */
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60 public CiCodePos(CiCodePos caller, RiResolvedMethod method, int bci) {
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61 assert method != null;
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62 this.caller = caller;
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63 this.method = method;
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64 this.bci = bci;
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65 }
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66
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67 /**
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68 * Converts this code position to a string representation.
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69 * @return a string representation of this code position
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70 */
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71 @Override
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72 public String toString() {
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73 return CiUtil.append(new StringBuilder(100), this).toString();
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74 }
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75
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76 /**
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77 * Deep equality test.
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78 */
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79 @Override
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80 public boolean equals(Object obj) {
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81 if (obj == this) {
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82 return true;
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83 }
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84 if (obj instanceof CiCodePos) {
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85 CiCodePos other = (CiCodePos) obj;
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86 if (other.method.equals(method) && other.bci == bci) {
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87 if (caller == null) {
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88 return other.caller == null;
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89 }
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90 return caller.equals(other.caller);
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91 }
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92 }
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93 return false;
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94 }
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95
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96 @Override
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97 public int hashCode() {
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98 return bci;
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99 }
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100 }