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 #ifdef TARGET_OS_FAMILY_linux
  30 # include "thread_linux.inline.hpp"
  31 #endif
  32 #ifdef TARGET_OS_FAMILY_solaris
  33 # include "thread_solaris.inline.hpp"
  34 #endif
  35 #ifdef TARGET_OS_FAMILY_windows
  36 # include "thread_windows.inline.hpp"
  37 #endif
  38 
  39 // This file provides more support for exception handling; see also exceptions.hpp
  40 class PreserveExceptionMark {
  41  private:
  42   Thread*     _thread;
  43   Handle      _preserved_exception_oop;
  44   int         _preserved_exception_line;
  45   const char* _preserved_exception_file;
  46 
  47  public:
  48   PreserveExceptionMark(Thread*& thread);
  49   ~PreserveExceptionMark();
  50 };
  51 
  52 
  53 // This is a clone of PreserveExceptionMark which asserts instead
  54 // of failing when what it wraps generates a pending exception.
  55 // It also addresses bug 6431341.
  56 class CautiouslyPreserveExceptionMark {
  57  private:
  58   Thread*     _thread;
  59   Handle      _preserved_exception_oop;
  60   int         _preserved_exception_line;
  61   const char* _preserved_exception_file;
  62 
  63  public:
  64   CautiouslyPreserveExceptionMark(Thread* thread);
  65   ~CautiouslyPreserveExceptionMark();
  66 };
  67 
  68 
  69 // Like PreserveExceptionMark but allows new exceptions to be generated in
  70 // the body of the mark. If a new exception is generated then the original one
  71 // is discarded.
  72 class WeakPreserveExceptionMark {
  73 private:
  74   Thread*     _thread;
  75   Handle      _preserved_exception_oop;
  76   int         _preserved_exception_line;
  77   const char* _preserved_exception_file;
  78 
  79   void        preserve();
  80   void        restore();
  81 
  82   public:
  83     WeakPreserveExceptionMark(Thread* pThread) :  _thread(pThread), _preserved_exception_oop()  {
  84       if (pThread->has_pending_exception()) {
  85         preserve();
  86       }
  87     }
  88     ~WeakPreserveExceptionMark() {
  89       if (_preserved_exception_oop.not_null()) {
  90         restore();
  91       }
  92     }
  93 };
  94 
  95 
  96 
  97 // use global exception mark when allowing pending exception to be set and
  98 // saving and restoring them
  99 #define PRESERVE_EXCEPTION_MARK                    Thread* THREAD; PreserveExceptionMark __em(THREAD);
 100 
 101 #endif // SHARE_VM_UTILITIES_PRESERVEEXCEPTION_HPP