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.inline.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