preserveException.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1998, 2006, 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.
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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
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23 */
24
25// This file provides more support for exception handling; see also exceptions.hpp
26class PreserveExceptionMark {
27 private:
28  Thread*     _thread;
29  Handle      _preserved_exception_oop;
30  int         _preserved_exception_line;
31  const char* _preserved_exception_file;
32
33 public:
34  PreserveExceptionMark(Thread*& thread);
35  ~PreserveExceptionMark();
36};
37
38
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.
42class CautiouslyPreserveExceptionMark {
43 private:
44  Thread*     _thread;
45  Handle      _preserved_exception_oop;
46  int         _preserved_exception_line;
47  const char* _preserved_exception_file;
48
49 public:
50  CautiouslyPreserveExceptionMark(Thread* thread);
51  ~CautiouslyPreserveExceptionMark();
52};
53
54
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.
58class WeakPreserveExceptionMark {
59private:
60  Thread*     _thread;
61  Handle      _preserved_exception_oop;
62  int         _preserved_exception_line;
63  const char* _preserved_exception_file;
64
65  void        preserve();
66  void        restore();
67
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};
80
81
82
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);
86