preserveException.cpp revision 1472:c18cbe5936b8
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 30PreserveExceptionMark::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 40PreserveExceptionMark::~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 58CautiouslyPreserveExceptionMark::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 67CautiouslyPreserveExceptionMark::~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 78void 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 85void WeakPreserveExceptionMark::restore() { 86 if (!_thread->has_pending_exception()) { 87 _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line); 88 } 89} 90