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comparison agent/src/share/classes/sun/jvm/hotspot/code/ScopeDesc.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.code;
26
27 import java.io.*;
28 import java.util.*;
29
30 import sun.jvm.hotspot.oops.*;
31 import sun.jvm.hotspot.runtime.*;
32
33 /** ScopeDescs contain the information that makes source-level
34 debugging of nmethods possible; each scopeDesc describes a method
35 activation */
36
37 public class ScopeDesc {
38 /** NMethod information */
39 private NMethod code;
40 private Method method;
41 private int bci;
42 /** Decoding offsets */
43 private int decodeOffset;
44 private int senderDecodeOffset;
45 private int localsDecodeOffset;
46 private int expressionsDecodeOffset;
47 private int monitorsDecodeOffset;
48
49 public ScopeDesc(NMethod code, int decodeOffset) {
50 this.code = code;
51 this.decodeOffset = decodeOffset;
52
53 // Decode header
54 DebugInfoReadStream stream = streamAt(decodeOffset);
55
56 senderDecodeOffset = stream.readInt();
57 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle());
58 bci = stream.readBCI();
59 // Decode offsets for body and sender
60 localsDecodeOffset = stream.readInt();
61 expressionsDecodeOffset = stream.readInt();
62 monitorsDecodeOffset = stream.readInt();
63 }
64
65 public NMethod getNMethod() { return code; }
66 public Method getMethod() { return method; }
67 public int getBCI() { return bci; }
68
69 /** Returns a List<ScopeValue> */
70 public List getLocals() {
71 return decodeScopeValues(localsDecodeOffset);
72 }
73
74 /** Returns a List<ScopeValue> */
75 public List getExpressions() {
76 return decodeScopeValues(expressionsDecodeOffset);
77 }
78
79 /** Returns a List<MonitorValue> */
80 public List getMonitors() {
81 return decodeMonitorValues(monitorsDecodeOffset);
82 }
83
84 /** Stack walking. Returns null if this is the outermost scope. */
85 public ScopeDesc sender() {
86 if (isTop()) {
87 return null;
88 }
89
90 return new ScopeDesc(code, senderDecodeOffset);
91 }
92
93 /** Returns where the scope was decoded */
94 public int getDecodeOffset() {
95 return decodeOffset;
96 }
97
98 /** Tells whether sender() returns null */
99 public boolean isTop() {
100 return (senderDecodeOffset == DebugInformationRecorder.SERIALIZED_NULL);
101 }
102
103 public boolean equals(Object arg) {
104 if (arg == null) {
105 return false;
106 }
107
108 if (!(arg instanceof ScopeDesc)) {
109 return false;
110 }
111
112 ScopeDesc sd = (ScopeDesc) arg;
113
114 return (sd.method.equals(method) && (sd.bci == bci));
115 }
116
117 public void printValue() {
118 printValueOn(System.out);
119 }
120
121 public void printValueOn(PrintStream tty) {
122 tty.print("ScopeDesc for ");
123 method.printValueOn(tty);
124 tty.println(" @bci " + bci);
125 }
126
127 // FIXME: add more accessors
128
129 //--------------------------------------------------------------------------------
130 // Internals only below this point
131 //
132
133 private DebugInfoReadStream streamAt(int decodeOffset) {
134 return new DebugInfoReadStream(code, decodeOffset);
135 }
136
137 /** Returns a List<ScopeValue> or null if no values were present */
138 private List decodeScopeValues(int decodeOffset) {
139 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
140 return null;
141 }
142 DebugInfoReadStream stream = streamAt(decodeOffset);
143 int length = stream.readInt();
144 List res = new ArrayList(length);
145 for (int i = 0; i < length; i++) {
146 res.add(ScopeValue.readFrom(stream));
147 }
148 return res;
149 }
150
151 /** Returns a List&lt;MonitorValue&gt; or null if no values were present */
152 private List decodeMonitorValues(int decodeOffset) {
153 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) {
154 return null;
155 }
156 DebugInfoReadStream stream = streamAt(decodeOffset);
157 int length = stream.readInt();
158 List res = new ArrayList(length);
159 for (int i = 0; i < length; i++) {
160 res.add(new MonitorValue(stream));
161 }
162 return res;
163 }
164 }