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

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8 1a5913bf5e19
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2004 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.utilities;
26
27 import sun.jvm.hotspot.code.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.gc_interface.*;
30 import sun.jvm.hotspot.interpreter.*;
31 import sun.jvm.hotspot.runtime.*;
32 import sun.jvm.hotspot.memory.*;
33
34 /** This class, only intended for use in the debugging system,
35 provides the functionality of find() in the VM. */
36
37 public class PointerFinder {
38 public static PointerLocation find(Address a) {
39 PointerLocation loc = new PointerLocation(a);
40
41 CollectedHeap heap = VM.getVM().getUniverse().heap();
42 if (heap instanceof GenCollectedHeap) {
43 GenCollectedHeap genheap = (GenCollectedHeap) heap;
44 if (genheap.isIn(a)) {
45 for (int i = 0; i < genheap.nGens(); i++) {
46 Generation g = genheap.getGen(i);
47 if (g.isIn(a)) {
48 loc.gen = g;
49 break;
50 }
51 }
52
53 if (loc.gen == null) {
54 // Should be in perm gen
55 Generation permGen = genheap.permGen();
56 if (Assert.ASSERTS_ENABLED) {
57 Assert.that(permGen.isIn(a), "should have been in ordinary or perm gens if it's in the heap");
58 }
59 loc.permGen = permGen;
60 }
61
62 if (VM.getVM().getUseTLAB()) {
63 // Try to find thread containing it
64 for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) {
65 ThreadLocalAllocBuffer tlab = t.tlab();
66 if (tlab.contains(a)) {
67 loc.inTLAB = true;
68 loc.tlabThread = t;
69 loc.tlab = tlab;
70 break;
71 }
72 }
73 }
74
75 return loc;
76 }
77 } else {
78 if (heap.isIn(a)) {
79 loc.heap = heap;
80 return loc;
81 }
82 }
83
84 Interpreter interp = VM.getVM().getInterpreter();
85 if (interp.contains(a)) {
86 loc.inInterpreter = true;
87 loc.interpreterCodelet = interp.getCodeletContaining(a);
88 return loc;
89 }
90
91 if (!VM.getVM().isCore()) {
92 CodeCache c = VM.getVM().getCodeCache();
93 if (c.contains(a)) {
94 loc.inCodeCache = true;
95 loc.blob = c.findBlobUnsafe(a);
96 if (Assert.ASSERTS_ENABLED) {
97 Assert.that(loc.blob != null, "Should have found CodeBlob");
98 }
99 loc.inBlobInstructions = loc.blob.instructionsContains(a);
100 loc.inBlobData = loc.blob.dataContains(a);
101 loc.inBlobOops = loc.blob.oopsContains(a);
102 loc.inBlobUnknownLocation = (!(loc.inBlobInstructions ||
103 loc.inBlobData ||
104 loc.inBlobOops));
105 return loc;
106 }
107 }
108
109 // Check JNIHandles; both local and global
110 JNIHandles handles = VM.getVM().getJNIHandles();
111 JNIHandleBlock handleBlock = handles.globalHandles();
112 if (handleBlock != null) {
113 handleBlock = handleBlock.blockContainingHandle(a);
114 }
115 if (handleBlock != null) {
116 loc.inStrongGlobalJNIHandleBlock = true;
117 loc.handleBlock = handleBlock;
118 return loc;
119 } else {
120 handleBlock = handles.weakGlobalHandles();
121 if (handleBlock != null) {
122 handleBlock = handleBlock.blockContainingHandle(a);
123 if (handleBlock != null) {
124 loc.inWeakGlobalJNIHandleBlock = true;
125 loc.handleBlock = handleBlock;
126 return loc;
127 } else {
128 // Look in thread-local handles
129 for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) {
130 handleBlock = t.activeHandles();
131 if (handleBlock != null) {
132 handleBlock = handleBlock.blockContainingHandle(a);
133 if (handleBlock != null) {
134 loc.inLocalJNIHandleBlock = true;
135 loc.handleBlock = handleBlock;
136 loc.handleThread = t;
137 return loc;
138 }
139 }
140 }
141 }
142 }
143 }
144
145
146 // Fall through; have to return it anyway.
147 return loc;
148 }
149 }