1 /*
   2  * Copyright (c) 1998, 2006, 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 #include "incls/_precompiled.incl"
  26 #include "incls/_preserveException.cpp.incl"
  27 
  28 // TODO: These three classes should be refactored
  29 
  30 PreserveExceptionMark::PreserveExceptionMark(Thread*& thread) {
  31   thread     = Thread::current();
  32   _thread    = thread;
  33   _preserved_exception_oop = Handle(thread, _thread->pending_exception());
  34   _thread->clear_pending_exception(); // Needed to avoid infinite recursion
  35   _preserved_exception_line = _thread->exception_line();
  36   _preserved_exception_file = _thread->exception_file();
  37 }
  38 
  39 
  40 PreserveExceptionMark::~PreserveExceptionMark() {
  41   if (_thread->has_pending_exception()) {
  42     oop exception = _thread->pending_exception();
  43     _thread->clear_pending_exception(); // Needed to avoid infinite recursion
  44     exception->print();
  45     fatal("PreserveExceptionMark destructor expects no pending exceptions");
  46   }
  47   if (_preserved_exception_oop() != NULL) {
  48     _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);
  49   }
  50 }
  51 
  52 
  53 // This code is cloned from PreserveExceptionMark, except that:
  54 //   returned pending exceptions do not cause a crash.
  55 //   thread is passed in, not set (not a reference parameter)
  56 //   and bug 6431341 has been addressed.
  57 
  58 CautiouslyPreserveExceptionMark::CautiouslyPreserveExceptionMark(Thread* thread) {
  59   _thread    = thread;
  60   _preserved_exception_oop = Handle(thread, _thread->pending_exception());
  61   _preserved_exception_line = _thread->exception_line();
  62   _preserved_exception_file = _thread->exception_file();
  63   _thread->clear_pending_exception(); // Pending exceptions are checked in the destructor
  64 }
  65 
  66 
  67 CautiouslyPreserveExceptionMark::~CautiouslyPreserveExceptionMark() {
  68   assert(!_thread->has_pending_exception(), "unexpected exception generated");
  69   if (_thread->has_pending_exception()) {
  70     _thread->clear_pending_exception();
  71   }
  72   if (_preserved_exception_oop() != NULL) {
  73     _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);
  74   }
  75 }
  76 
  77 
  78 void WeakPreserveExceptionMark::preserve() {
  79   _preserved_exception_oop = Handle(_thread, _thread->pending_exception());
  80   _preserved_exception_line = _thread->exception_line();
  81   _preserved_exception_file = _thread->exception_file();
  82   _thread->clear_pending_exception();
  83 }
  84 
  85 void WeakPreserveExceptionMark::restore() {
  86   if (!_thread->has_pending_exception()) {
  87     _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);
  88   }
  89 }