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src/share/vm/utilities/preserveException.hpp@df6caf649ff7 (annotated)

src/share/vm/utilities/preserveException.hpp

Tue, 14 Jul 2009 15:40:39 -0700

author

ysr

date

Tue, 14 Jul 2009 15:40:39 -0700

changeset 1280

df6caf649ff7

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6700789: G1: Enable use of compressed oops with G1 heaps
Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp

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	// This file provides more support for exception handling; see also exceptions.hpp
duke@435	26	class PreserveExceptionMark {
duke@435	27	private:
duke@435	28	Thread* _thread;
duke@435	29	Handle _preserved_exception_oop;
duke@435	30	int _preserved_exception_line;
duke@435	31	const char* _preserved_exception_file;
duke@435	32
duke@435	33	public:
duke@435	34	PreserveExceptionMark(Thread*& thread);
duke@435	35	~PreserveExceptionMark();
duke@435	36	};
duke@435	37
duke@435	38
duke@435	39	// This is a clone of PreserveExceptionMark which asserts instead
duke@435	40	// of failing when what it wraps generates a pending exception.
duke@435	41	// It also addresses bug 6431341.
duke@435	42	class CautiouslyPreserveExceptionMark {
duke@435	43	private:
duke@435	44	Thread* _thread;
duke@435	45	Handle _preserved_exception_oop;
duke@435	46	int _preserved_exception_line;
duke@435	47	const char* _preserved_exception_file;
duke@435	48
duke@435	49	public:
duke@435	50	CautiouslyPreserveExceptionMark(Thread* thread);
duke@435	51	~CautiouslyPreserveExceptionMark();
duke@435	52	};
duke@435	53
duke@435	54
duke@435	55	// Like PreserveExceptionMark but allows new exceptions to be generated in
duke@435	56	// the body of the mark. If a new exception is generated then the original one
duke@435	57	// is discarded.
duke@435	58	class WeakPreserveExceptionMark {
duke@435	59	private:
duke@435	60	Thread* _thread;
duke@435	61	Handle _preserved_exception_oop;
duke@435	62	int _preserved_exception_line;
duke@435	63	const char* _preserved_exception_file;
duke@435	64
duke@435	65	void preserve();
duke@435	66	void restore();
duke@435	67
duke@435	68	public:
duke@435	69	WeakPreserveExceptionMark(Thread* pThread) : _thread(pThread), _preserved_exception_oop() {
duke@435	70	if (pThread->has_pending_exception()) {
duke@435	71	preserve();
duke@435	72	}
duke@435	73	}
duke@435	74	~WeakPreserveExceptionMark() {
duke@435	75	if (_preserved_exception_oop.not_null()) {
duke@435	76	restore();
duke@435	77	}
duke@435	78	}
duke@435	79	};
duke@435	80
duke@435	81
duke@435	82
duke@435	83	// use global exception mark when allowing pending exception to be set and
duke@435	84	// saving and restoring them
duke@435	85	#define PRESERVE_EXCEPTION_MARK Thread* THREAD; PreserveExceptionMark __em(THREAD);