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src/share/vm/memory/genRemSet.cpp@6acf14e730dd (annotated)

src/share/vm/memory/genRemSet.cpp

Tue, 16 Feb 2016 21:42:29 +0000

author

poonam

date

Tue, 16 Feb 2016 21:42:29 +0000

changeset 8308

6acf14e730dd

parent 6198

55fb97c4c58d

child 6876

710a3c8b516e

permissions

-rw-r--r--

8072725: Provide more granular levels for GC verification
Summary: Add option VerifySubSet to selectively verify the memory sub-systems
Reviewed-by: kevinw, jmasa

duke@435	1	/*
mikael@6198	2	* Copyright (c) 2001, 2013, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
coleenp@4037	26	#include "classfile/classLoaderData.hpp"
stefank@2314	27	#include "memory/cardTableRS.hpp"
stefank@2314	28	#include "memory/genRemSet.hpp"
stefank@2314	29
duke@435	30	// This kind of "BarrierSet" allows a "CollectedHeap" to detect and
duke@435	31	// enumerate ref fields that have been modified (since the last
duke@435	32	// enumeration.)
duke@435	33
duke@435	34	uintx GenRemSet::max_alignment_constraint(Name nm) {
jwilhelm@5818	35	assert(nm == GenRemSet::CardTable, "Unrecognized GenRemSet type.");
jwilhelm@5818	36	return CardTableRS::ct_max_alignment_constraint();
duke@435	37	}
coleenp@4037	38
coleenp@4037	39	class HasAccumulatedModifiedOopsClosure : public KlassClosure {
coleenp@4037	40	bool _found;
coleenp@4037	41	public:
coleenp@4037	42	HasAccumulatedModifiedOopsClosure() : _found(false) {}
coleenp@4037	43	void do_klass(Klass* klass) {
coleenp@4037	44	if (_found) {
coleenp@4037	45	return;
coleenp@4037	46	}
coleenp@4037	47
coleenp@4037	48	if (klass->has_accumulated_modified_oops()) {
coleenp@4037	49	_found = true;
coleenp@4037	50	}
coleenp@4037	51	}
coleenp@4037	52	bool found() {
coleenp@4037	53	return _found;
coleenp@4037	54	}
coleenp@4037	55	};
coleenp@4037	56
coleenp@4037	57	bool KlassRemSet::mod_union_is_clear() {
coleenp@4037	58	HasAccumulatedModifiedOopsClosure closure;
coleenp@4037	59	ClassLoaderDataGraph::classes_do(&closure);
coleenp@4037	60
coleenp@4037	61	return !closure.found();
coleenp@4037	62	}
coleenp@4037	63
coleenp@4037	64
coleenp@4037	65	class ClearKlassModUnionClosure : public KlassClosure {
coleenp@4037	66	public:
coleenp@4037	67	void do_klass(Klass* klass) {
coleenp@4037	68	if (klass->has_accumulated_modified_oops()) {
coleenp@4037	69	klass->clear_accumulated_modified_oops();
coleenp@4037	70	}
coleenp@4037	71	}
coleenp@4037	72	};
coleenp@4037	73
coleenp@4037	74	void KlassRemSet::clear_mod_union() {
coleenp@4037	75	ClearKlassModUnionClosure closure;
coleenp@4037	76	ClassLoaderDataGraph::classes_do(&closure);
coleenp@4037	77	}