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src/share/vm/gc_implementation/parNew/parOopClosures.hpp@0bfd3fb24150 (annotated)

src/share/vm/gc_implementation/parNew/parOopClosures.hpp

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

author

jmasa

date

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

changeset 1822

0bfd3fb24150

parent 548

ba764ed4b6f2

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 (c) 2007 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	// Closures for ParNewGeneration
duke@435	26
duke@435	27	class ParScanThreadState;
duke@435	28	class ParNewGeneration;
coleenp@548	29	typedef OopTaskQueueSet ObjToScanQueueSet;
duke@435	30	class ParallelTaskTerminator;
duke@435	31
duke@435	32	class ParScanClosure: public OopsInGenClosure {
coleenp@548	33	protected:
duke@435	34	ParScanThreadState* _par_scan_state;
coleenp@548	35	ParNewGeneration* _g;
coleenp@548	36	HeapWord* _boundary;
coleenp@548	37	template <class T> void inline par_do_barrier(T* p);
coleenp@548	38	template <class T> void inline do_oop_work(T* p,
coleenp@548	39	bool gc_barrier,
coleenp@548	40	bool root_scan);
coleenp@548	41	public:
duke@435	42	ParScanClosure(ParNewGeneration* g, ParScanThreadState* par_scan_state);
duke@435	43	};
duke@435	44
duke@435	45	class ParScanWithBarrierClosure: public ParScanClosure {
coleenp@548	46	public:
duke@435	47	ParScanWithBarrierClosure(ParNewGeneration* g,
duke@435	48	ParScanThreadState* par_scan_state) :
duke@435	49	ParScanClosure(g, par_scan_state) {}
coleenp@548	50	virtual void do_oop(oop* p);
coleenp@548	51	virtual void do_oop(narrowOop* p);
coleenp@548	52	inline void do_oop_nv(oop* p);
coleenp@548	53	inline void do_oop_nv(narrowOop* p);
duke@435	54	};
duke@435	55
duke@435	56	class ParScanWithoutBarrierClosure: public ParScanClosure {
coleenp@548	57	public:
duke@435	58	ParScanWithoutBarrierClosure(ParNewGeneration* g,
duke@435	59	ParScanThreadState* par_scan_state) :
duke@435	60	ParScanClosure(g, par_scan_state) {}
coleenp@548	61	virtual void do_oop(oop* p);
coleenp@548	62	virtual void do_oop(narrowOop* p);
coleenp@548	63	inline void do_oop_nv(oop* p);
coleenp@548	64	inline void do_oop_nv(narrowOop* p);
duke@435	65	};
duke@435	66
duke@435	67	class ParRootScanWithBarrierTwoGensClosure: public ParScanClosure {
coleenp@548	68	public:
duke@435	69	ParRootScanWithBarrierTwoGensClosure(ParNewGeneration* g,
duke@435	70	ParScanThreadState* par_scan_state) :
duke@435	71	ParScanClosure(g, par_scan_state) {}
coleenp@548	72	virtual void do_oop(oop* p);
coleenp@548	73	virtual void do_oop(narrowOop* p);
duke@435	74	};
duke@435	75
duke@435	76	class ParRootScanWithoutBarrierClosure: public ParScanClosure {
coleenp@548	77	public:
duke@435	78	ParRootScanWithoutBarrierClosure(ParNewGeneration* g,
duke@435	79	ParScanThreadState* par_scan_state) :
duke@435	80	ParScanClosure(g, par_scan_state) {}
coleenp@548	81	virtual void do_oop(oop* p);
coleenp@548	82	virtual void do_oop(narrowOop* p);
duke@435	83	};
duke@435	84
duke@435	85	class ParScanWeakRefClosure: public ScanWeakRefClosure {
coleenp@548	86	protected:
duke@435	87	ParScanThreadState* _par_scan_state;
coleenp@548	88	template <class T> inline void do_oop_work(T* p);
coleenp@548	89	public:
duke@435	90	ParScanWeakRefClosure(ParNewGeneration* g,
duke@435	91	ParScanThreadState* par_scan_state);
coleenp@548	92	virtual void do_oop(oop* p);
coleenp@548	93	virtual void do_oop(narrowOop* p);
coleenp@548	94	inline void do_oop_nv(oop* p);
coleenp@548	95	inline void do_oop_nv(narrowOop* p);
duke@435	96	};
duke@435	97
duke@435	98	class ParEvacuateFollowersClosure: public VoidClosure {
coleenp@548	99	private:
duke@435	100	ParScanThreadState* _par_scan_state;
duke@435	101	ParScanThreadState* par_scan_state() { return _par_scan_state; }
duke@435	102
duke@435	103	// We want to preserve the specific types here (rather than "OopClosure")
duke@435	104	// for later de-virtualization of do_oop calls.
duke@435	105	ParScanWithoutBarrierClosure* _to_space_closure;
duke@435	106	ParScanWithoutBarrierClosure* to_space_closure() {
duke@435	107	return _to_space_closure;
duke@435	108	}
duke@435	109	ParRootScanWithoutBarrierClosure* _to_space_root_closure;
duke@435	110	ParRootScanWithoutBarrierClosure* to_space_root_closure() {
duke@435	111	return _to_space_root_closure;
duke@435	112	}
duke@435	113
duke@435	114	ParScanWithBarrierClosure* _old_gen_closure;
duke@435	115	ParScanWithBarrierClosure* old_gen_closure () {
duke@435	116	return _old_gen_closure;
duke@435	117	}
duke@435	118	ParRootScanWithBarrierTwoGensClosure* _old_gen_root_closure;
duke@435	119	ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure () {
duke@435	120	return _old_gen_root_closure;
duke@435	121	}
duke@435	122
duke@435	123	ParNewGeneration* _par_gen;
duke@435	124	ParNewGeneration* par_gen() { return _par_gen; }
duke@435	125
duke@435	126	ObjToScanQueueSet* _task_queues;
duke@435	127	ObjToScanQueueSet* task_queues() { return _task_queues; }
duke@435	128
duke@435	129	ParallelTaskTerminator* _terminator;
duke@435	130	ParallelTaskTerminator* terminator() { return _terminator; }
coleenp@548	131	public:
duke@435	132	ParEvacuateFollowersClosure(
duke@435	133	ParScanThreadState* par_scan_state_,
duke@435	134	ParScanWithoutBarrierClosure* to_space_closure_,
duke@435	135	ParScanWithBarrierClosure* old_gen_closure_,
duke@435	136	ParRootScanWithoutBarrierClosure* to_space_root_closure_,
duke@435	137	ParNewGeneration* par_gen_,
duke@435	138	ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure_,
duke@435	139	ObjToScanQueueSet* task_queues_,
duke@435	140	ParallelTaskTerminator* terminator_);
coleenp@548	141	virtual void do_void();
duke@435	142	};