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comparison 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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3732:3e2e8b8abdaf 3733:e233f5660da4
1 /*
2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.cri.ci;
24
25 import java.io.*;
26
27 import com.sun.cri.ri.*;
28
29 /**
30 * Represents a code position, that is, a chain of inlined methods with bytecode
31 * locations, that is communicated from the compiler to the runtime system. A code position
32 * can be used by the runtime system to reconstruct a source-level stack trace
33 * for exceptions and to create {@linkplain CiFrame frames} for deoptimization.
34 */
35 public class CiCodePos implements Serializable {
36 /**
37 * The position where this position has been called, {@code null} if none.
38 */
39 public final CiCodePos caller;
40
41 /**
42 * The runtime interface method for this position.
43 */
44 public final RiResolvedMethod method;
45
46 /**
47 * The location within the method, as a bytecode index. The constant
48 * {@code -1} may be used to indicate the location is unknown, for example
49 * within code synthesized by the compiler.
50 */
51 public final int bci;
52
53 /**
54 * Constructs a new object representing a given parent/caller, a given method, and a given BCI.
55 *
56 * @param caller the parent position
57 * @param method the method
58 * @param bci a BCI within the method
59 */
60 public CiCodePos(CiCodePos caller, RiResolvedMethod method, int bci) {
61 assert method != null;
62 this.caller = caller;
63 this.method = method;
64 this.bci = bci;
65 }
66
67 /**
68 * Converts this code position to a string representation.
69 * @return a string representation of this code position
70 */
71 @Override
72 public String toString() {
73 return CiUtil.append(new StringBuilder(100), this).toString();
74 }
75
76 /**
77 * Deep equality test.
78 */
79 @Override
80 public boolean equals(Object obj) {
81 if (obj == this) {
82 return true;
83 }
84 if (obj instanceof CiCodePos) {
85 CiCodePos other = (CiCodePos) obj;
86 if (other.method.equals(method) && other.bci == bci) {
87 if (caller == null) {
88 return other.caller == null;
89 }
90 return caller.equals(other.caller);
91 }
92 }
93 return false;
94 }
95
96 @Override
97 public int hashCode() {
98 return bci;
99 }
100 }