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comparison graal/com.oracle.max.cri/src/com/sun/cri/ci/CiDebugInfo.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 /**
28 * Represents the debugging information for a particular place in the code,
29 * which includes the code position, a reference map, and deoptimization information.
30 */
31 public class CiDebugInfo implements Serializable {
32
33 /**
34 * The code position (including all inlined methods) of this debug info.
35 * If this is a {@link CiFrame} instance, then it is also the deoptimization information for each inlined frame.
36 */
37 public final CiCodePos codePos;
38
39 /**
40 * The reference map for the registers at this point. The reference map is <i>packed</i> in that
41 * for bit {@code k} in byte {@code n}, it refers to the register whose
42 * {@linkplain CiRegister#number number} is {@code (k + n * 8)}.
43 */
44 public final CiBitMap registerRefMap;
45
46 /**
47 * The reference map for the stack frame at this point. A set bit at {@code k} in the map
48 * represents stack slot number {@code k}.
49 */
50 public final CiBitMap frameRefMap;
51
52 /**
53 * Creates a new {@code CiDebugInfo} from the given values.
54 *
55 * @param codePos the {@linkplain CiCodePos code position} or {@linkplain CiFrame frame} info
56 * @param registerRefMap the register map
57 * @param frameRefMap the reference map for {@code frame}, which may be {@code null}
58 */
59 public CiDebugInfo(CiCodePos codePos, CiBitMap registerRefMap, CiBitMap frameRefMap) {
60 this.codePos = codePos;
61 this.registerRefMap = registerRefMap;
62 this.frameRefMap = frameRefMap;
63 }
64
65 /**
66 * @return {@code true} if this debug information has a frame
67 */
68 public boolean hasFrame() {
69 return codePos instanceof CiFrame;
70 }
71
72 /**
73 * @return {@code true} if this debug info has a reference map for the registers
74 */
75 public boolean hasRegisterRefMap() {
76 return registerRefMap != null && registerRefMap.size() > 0;
77 }
78
79 /**
80 * @return {@code true} if this debug info has a reference map for the stack
81 */
82 public boolean hasStackRefMap() {
83 return frameRefMap != null && frameRefMap.size() > 0;
84 }
85
86
87 /**
88 * Gets the deoptimization information for each inlined frame (if available).
89 *
90 * @return {@code null} if no frame de-opt info is {@linkplain #hasDebugFrame available}
91 */
92 public CiFrame frame() {
93 if (hasFrame()) {
94 return (CiFrame) codePos;
95 }
96 return null;
97 }
98
99 @Override
100 public String toString() {
101 return CiUtil.append(new StringBuilder(100), this, null).toString();
102 }
103 }