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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/StubRoutines.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 4948e7dd28dc
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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.runtime;
26
27 import java.util.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.types.*;
30
31 /** Very minimal port for now to get frames working */
32
33 public class StubRoutines {
34 private static AddressField callStubReturnAddressField;
35 private static AddressField callStubCompiledReturnAddressField;
36
37 static {
38 VM.registerVMInitializedObserver(new Observer() {
39 public void update(Observable o, Object data) {
40 initialize(VM.getVM().getTypeDataBase());
41 }
42 });
43 }
44
45 private static synchronized void initialize(TypeDataBase db) {
46 Type type = db.lookupType("StubRoutines");
47
48 callStubReturnAddressField = type.getAddressField("_call_stub_return_address");
49 // Only some platforms have specif return from compiled to call_stub
50 try {
51 callStubCompiledReturnAddressField = type.getAddressField("_call_stub_compiled_return");
52 } catch (RuntimeException re) {
53 callStubCompiledReturnAddressField = null;
54 }
55 }
56
57 public StubRoutines() {
58 }
59
60 public boolean returnsToCallStub(Address returnPC) {
61 Address addr = callStubReturnAddressField.getValue();
62 boolean result = false;
63 if (addr == null) {
64 result = (addr == returnPC);
65 } else {
66 result = addr.equals(returnPC);
67 }
68 if (result || callStubCompiledReturnAddressField == null ) return result;
69 // Could be a return to compiled code return point
70 addr = callStubCompiledReturnAddressField.getValue();
71 if (addr == null) {
72 return (addr == returnPC);
73 } else {
74 return (addr.equals(returnPC));
75 }
76
77 }
78 }