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src/share/vm/utilities/preserveException.cpp@c96030fff130 (annotated)

src/share/vm/utilities/preserveException.cpp

Thu, 20 Nov 2008 16:56:09 -0800

author

ysr

date

Thu, 20 Nov 2008 16:56:09 -0800

changeset 888

c96030fff130

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa

duke@435	1	/*
duke@435	2	* Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_preserveException.cpp.incl"
duke@435	27
duke@435	28	// TODO: These three classes should be refactored
duke@435	29
duke@435	30	PreserveExceptionMark::PreserveExceptionMark(Thread*& thread) {
duke@435	31	thread = Thread::current();
duke@435	32	_thread = thread;
duke@435	33	_preserved_exception_oop = Handle(thread, _thread->pending_exception());
duke@435	34	_thread->clear_pending_exception(); // Needed to avoid infinite recursion
duke@435	35	_preserved_exception_line = _thread->exception_line();
duke@435	36	_preserved_exception_file = _thread->exception_file();
duke@435	37	}
duke@435	38
duke@435	39
duke@435	40	PreserveExceptionMark::~PreserveExceptionMark() {
duke@435	41	if (_thread->has_pending_exception()) {
duke@435	42	oop exception = _thread->pending_exception();
duke@435	43	_thread->clear_pending_exception(); // Needed to avoid infinite recursion
duke@435	44	exception->print();
duke@435	45	fatal("PreserveExceptionMark destructor expects no pending exceptions");
duke@435	46	}
duke@435	47	if (_preserved_exception_oop() != NULL) {
duke@435	48	_thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);
duke@435	49	}
duke@435	50	}
duke@435	51
duke@435	52
duke@435	53	// This code is cloned from PreserveExceptionMark, except that:
duke@435	54	// returned pending exceptions do not cause a crash.
duke@435	55	// thread is passed in, not set (not a reference parameter)
duke@435	56	// and bug 6431341 has been addressed.
duke@435	57
duke@435	58	CautiouslyPreserveExceptionMark::CautiouslyPreserveExceptionMark(Thread* thread) {
duke@435	59	_thread = thread;
duke@435	60	_preserved_exception_oop = Handle(thread, _thread->pending_exception());
duke@435	61	_preserved_exception_line = _thread->exception_line();
duke@435	62	_preserved_exception_file = _thread->exception_file();
duke@435	63	_thread->clear_pending_exception(); // Pending exceptions are checked in the destructor
duke@435	64	}
duke@435	65
duke@435	66
duke@435	67	CautiouslyPreserveExceptionMark::~CautiouslyPreserveExceptionMark() {
duke@435	68	assert(!_thread->has_pending_exception(), "unexpected exception generated");
duke@435	69	if (_thread->has_pending_exception()) {
duke@435	70	_thread->clear_pending_exception();
duke@435	71	}
duke@435	72	if (_preserved_exception_oop() != NULL) {
duke@435	73	_thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);
duke@435	74	}
duke@435	75	}
duke@435	76
duke@435	77
duke@435	78	void WeakPreserveExceptionMark::preserve() {
duke@435	79	_preserved_exception_oop = Handle(_thread, _thread->pending_exception());
duke@435	80	_preserved_exception_line = _thread->exception_line();
duke@435	81	_preserved_exception_file = _thread->exception_file();
duke@435	82	_thread->clear_pending_exception();
duke@435	83	}
duke@435	84
duke@435	85	void WeakPreserveExceptionMark::restore() {
duke@435	86	if (!_thread->has_pending_exception()) {
duke@435	87	_thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);
duke@435	88	}
duke@435	89	}