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  */

    24 

    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;

    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.

    42 class 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.

    58 class WeakPreserveExceptionMark {

    59 private:

    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);