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src/share/vm/memory/genRemSet.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/memory/genRemSet.cpp

Thu, 12 Oct 2017 21:27:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 21:27:07 +0800

changeset 7535

7ae4e26cb1e0

parent 6876

710a3c8b516e

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "classfile/classLoaderData.hpp"
aoqi@0	27	#include "memory/cardTableRS.hpp"
aoqi@0	28	#include "memory/genRemSet.hpp"
aoqi@0	29
aoqi@0	30	// This kind of "BarrierSet" allows a "CollectedHeap" to detect and
aoqi@0	31	// enumerate ref fields that have been modified (since the last
aoqi@0	32	// enumeration.)
aoqi@0	33
aoqi@0	34	uintx GenRemSet::max_alignment_constraint(Name nm) {
aoqi@0	35	assert(nm == GenRemSet::CardTable, "Unrecognized GenRemSet type.");
aoqi@0	36	return CardTableRS::ct_max_alignment_constraint();
aoqi@0	37	}
aoqi@0	38
aoqi@0	39	class HasAccumulatedModifiedOopsClosure : public KlassClosure {
aoqi@0	40	bool _found;
aoqi@0	41	public:
aoqi@0	42	HasAccumulatedModifiedOopsClosure() : _found(false) {}
aoqi@0	43	void do_klass(Klass* klass) {
aoqi@0	44	if (_found) {
aoqi@0	45	return;
aoqi@0	46	}
aoqi@0	47
aoqi@0	48	if (klass->has_accumulated_modified_oops()) {
aoqi@0	49	_found = true;
aoqi@0	50	}
aoqi@0	51	}
aoqi@0	52	bool found() {
aoqi@0	53	return _found;
aoqi@0	54	}
aoqi@0	55	};
aoqi@0	56
aoqi@0	57	bool KlassRemSet::mod_union_is_clear() {
aoqi@0	58	HasAccumulatedModifiedOopsClosure closure;
aoqi@0	59	ClassLoaderDataGraph::classes_do(&closure);
aoqi@0	60
aoqi@0	61	return !closure.found();
aoqi@0	62	}
aoqi@0	63
aoqi@0	64
aoqi@0	65	class ClearKlassModUnionClosure : public KlassClosure {
aoqi@0	66	public:
aoqi@0	67	void do_klass(Klass* klass) {
aoqi@0	68	if (klass->has_accumulated_modified_oops()) {
aoqi@0	69	klass->clear_accumulated_modified_oops();
aoqi@0	70	}
aoqi@0	71	}
aoqi@0	72	};
aoqi@0	73
aoqi@0	74	void KlassRemSet::clear_mod_union() {
aoqi@0	75	ClearKlassModUnionClosure closure;
aoqi@0	76	ClassLoaderDataGraph::classes_do(&closure);
aoqi@0	77	}