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

    32 class 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.

    48 class 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.

    64 class WeakPreserveExceptionMark {

    65 private:

    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