Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/utilities/preserveException.hpp@c96030fff130
src/share/vm/utilities/preserveException.hpp
Thu, 20 Nov 2008 16:56:09 -0800
- author
- ysr
- date
- Thu, 20 Nov 2008 16:56:09 -0800
- changeset 888
- c96030fff130
- parent 435
- a61af66fc99e
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
1 /*
2 * Copyright 1998-2006 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 */
25 // This file provides more support for exception handling; see also exceptions.hpp
26 class PreserveExceptionMark {
27 private:
28 Thread* _thread;
29 Handle _preserved_exception_oop;
30 int _preserved_exception_line;
31 const char* _preserved_exception_file;
33 public:
34 PreserveExceptionMark(Thread*& thread);
35 ~PreserveExceptionMark();
36 };
39 // This is a clone of PreserveExceptionMark which asserts instead
40 // of failing when what it wraps generates a pending exception.
41 // It also addresses bug 6431341.
42 class CautiouslyPreserveExceptionMark {
43 private:
44 Thread* _thread;
45 Handle _preserved_exception_oop;
46 int _preserved_exception_line;
47 const char* _preserved_exception_file;
49 public:
50 CautiouslyPreserveExceptionMark(Thread* thread);
51 ~CautiouslyPreserveExceptionMark();
52 };
55 // Like PreserveExceptionMark but allows new exceptions to be generated in
56 // the body of the mark. If a new exception is generated then the original one
57 // is discarded.
58 class WeakPreserveExceptionMark {
59 private:
60 Thread* _thread;
61 Handle _preserved_exception_oop;
62 int _preserved_exception_line;
63 const char* _preserved_exception_file;
65 void preserve();
66 void restore();
68 public:
69 WeakPreserveExceptionMark(Thread* pThread) : _thread(pThread), _preserved_exception_oop() {
70 if (pThread->has_pending_exception()) {
71 preserve();
72 }
73 }
74 ~WeakPreserveExceptionMark() {
75 if (_preserved_exception_oop.not_null()) {
76 restore();
77 }
78 }
79 };
83 // use global exception mark when allowing pending exception to be set and
84 // saving and restoring them
85 #define PRESERVE_EXCEPTION_MARK Thread* THREAD; PreserveExceptionMark __em(THREAD);
