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src/share/vm/gc_implementation/shared/liveRange.hpp@0bfd3fb24150 (annotated)

src/share/vm/gc_implementation/shared/liveRange.hpp

Tue, 13 Apr 2010 13:52:10 -0700

author

jmasa

date

Tue, 13 Apr 2010 13:52:10 -0700

changeset 1822

0bfd3fb24150

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory
Reviewed-by: ysr, jcoomes

duke@435	1	/*
duke@435	2	* Copyright 2001-2003 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 is a shared helper class used during phase 3 and 4 to move all the objects
duke@435	26	// Dead regions in a Space are linked together to keep track of the live regions
duke@435	27	// so that the live data can be traversed quickly without having to look at each
duke@435	28	// object.
duke@435	29
duke@435	30	class LiveRange: public MemRegion {
duke@435	31	public:
duke@435	32	LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}
duke@435	33
duke@435	34	void set_end(HeapWord* e) {
duke@435	35	assert(e >= start(), "should be a non-zero range");
duke@435	36	MemRegion::set_end(e);
duke@435	37	}
duke@435	38	void set_word_size(size_t ws) {
duke@435	39	assert(ws >= 0, "should be a non-zero range");
duke@435	40	MemRegion::set_word_size(ws);
duke@435	41	}
duke@435	42
duke@435	43	LiveRange * next() { return (LiveRange *) end(); }
duke@435	44
duke@435	45	void move_to(HeapWord* destination) {
duke@435	46	Copy::aligned_conjoint_words(start(), destination, word_size());
duke@435	47	}
duke@435	48	};