1/*
2 * Copyright (c) 1998, 2010, 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.
18 *
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
21 * questions.
22 *
23 */
24
25#ifndef SHARE_VM_UTILITIES_PRESERVEEXCEPTION_HPP
26#define SHARE_VM_UTILITIES_PRESERVEEXCEPTION_HPP
27
28#include "runtime/handles.hpp"
29#include "runtime/thread.hpp"
30
31// This file provides more support for exception handling; see also exceptions.hpp
32class PreserveExceptionMark {
33 private:
34  Thread*     _thread;
35  Handle      _preserved_exception_oop;
36  int         _preserved_exception_line;
37  const char* _preserved_exception_file;
38
39 public:
40  PreserveExceptionMark(Thread*& thread);
41  ~PreserveExceptionMark();
42};
43
44
45// This is a clone of PreserveExceptionMark which asserts instead
46// of failing when what it wraps generates a pending exception.
47// It also addresses bug 6431341.
48class CautiouslyPreserveExceptionMark {
49 private:
50  Thread*     _thread;
51  Handle      _preserved_exception_oop;
52  int         _preserved_exception_line;
53  const char* _preserved_exception_file;
54
55 public:
56  CautiouslyPreserveExceptionMark(Thread* thread);
57  ~CautiouslyPreserveExceptionMark();
58};
59
60
61// Like PreserveExceptionMark but allows new exceptions to be generated in
62// the body of the mark. If a new exception is generated then the original one
63// is discarded.
64class WeakPreserveExceptionMark {
65private:
66  Thread*     _thread;
67  Handle      _preserved_exception_oop;
68  int         _preserved_exception_line;
69  const char* _preserved_exception_file;
70
71  void        preserve();
72  void        restore();
73
74  public:
75    WeakPreserveExceptionMark(Thread* pThread) :  _thread(pThread), _preserved_exception_oop()  {
76      if (pThread->has_pending_exception()) {
77        preserve();
78      }
79    }
80    ~WeakPreserveExceptionMark() {
81      if (_preserved_exception_oop.not_null()) {
82        restore();
83      }
84    }
85};
86
87
88
89// use global exception mark when allowing pending exception to be set and
90// saving and restoring them
91#define PRESERVE_EXCEPTION_MARK                    Thread* THREAD; PreserveExceptionMark __em(THREAD);
92
93#endif // SHARE_VM_UTILITIES_PRESERVEEXCEPTION_HPP
94