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comparison graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiCodePos.java @ 4199:aaac4894175c

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Renamed cri packages from sun to oracle.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 03 Jan 2012 16:29:28 +0100
parents graal/com.oracle.max.cri/src/com/sun/cri/ci/CiCodePos.java@bc8527f3071c
children 51111665eda6
comparison
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4198:8c9c0e1eaab1 4199:aaac4894175c
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.oracle.max.cri.ci;
24
25 import java.io.*;
26
27 import com.oracle.max.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 *
38 */
39 private static final long serialVersionUID = 8633885274526033515L;
40
41 /**
42 * The position where this position has been called, {@code null} if none.
43 */
44 public final CiCodePos caller;
45
46 /**
47 * The runtime interface method for this position.
48 */
49 public final RiResolvedMethod method;
50
51 /**
52 * The location within the method, as a bytecode index. The constant
53 * {@code -1} may be used to indicate the location is unknown, for example
54 * within code synthesized by the compiler.
55 */
56 public final int bci;
57
58 /**
59 * Constructs a new object representing a given parent/caller, a given method, and a given BCI.
60 *
61 * @param caller the parent position
62 * @param method the method
63 * @param bci a BCI within the method
64 */
65 public CiCodePos(CiCodePos caller, RiResolvedMethod method, int bci) {
66 assert method != null;
67 this.caller = caller;
68 this.method = method;
69 this.bci = bci;
70 }
71
72 /**
73 * Converts this code position to a string representation.
74 * @return a string representation of this code position
75 */
76 @Override
77 public String toString() {
78 return CiUtil.append(new StringBuilder(100), this).toString();
79 }
80
81 /**
82 * Deep equality test.
83 */
84 @Override
85 public boolean equals(Object obj) {
86 if (obj == this) {
87 return true;
88 }
89 if (obj instanceof CiCodePos) {
90 CiCodePos other = (CiCodePos) obj;
91 if (other.method.equals(method) && other.bci == bci) {
92 if (caller == null) {
93 return other.caller == null;
94 }
95 return caller.equals(other.caller);
96 }
97 }
98 return false;
99 }
100
101 @Override
102 public int hashCode() {
103 return bci;
104 }
105 }