• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/memory/genOopClosures.hpp@d1605aabd0a1 (annotated)

src/share/vm/memory/genOopClosures.hpp

Wed, 02 Jul 2008 12:55:16 -0700

author

xdono

date

Wed, 02 Jul 2008 12:55:16 -0700

changeset 631

d1605aabd0a1

parent 548

ba764ed4b6f2

child 791

1ee8caae33af

permissions

-rw-r--r--

6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell

duke@435	1	/*
xdono@631	2	* Copyright 2001-2008 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	class Generation;
duke@435	26	class HeapWord;
duke@435	27	class CardTableRS;
duke@435	28	class CardTableModRefBS;
duke@435	29	class DefNewGeneration;
duke@435	30
coleenp@548	31	template<class E> class GenericTaskQueue;
coleenp@548	32	typedef GenericTaskQueue<oop> OopTaskQueue;
coleenp@548	33	template<class E> class GenericTaskQueueSet;
coleenp@548	34	typedef GenericTaskQueueSet<oop> OopTaskQueueSet;
coleenp@548	35
duke@435	36	// Closure for iterating roots from a particular generation
duke@435	37	// Note: all classes deriving from this MUST call this do_barrier
duke@435	38	// method at the end of their own do_oop method!
duke@435	39	// Note: no do_oop defined, this is an abstract class.
duke@435	40
duke@435	41	class OopsInGenClosure : public OopClosure {
duke@435	42	private:
coleenp@548	43	Generation* _orig_gen; // generation originally set in ctor
coleenp@548	44	Generation* _gen; // generation being scanned
duke@435	45
duke@435	46	protected:
duke@435	47	// Some subtypes need access.
coleenp@548	48	HeapWord* _gen_boundary; // start of generation
coleenp@548	49	CardTableRS* _rs; // remembered set
duke@435	50
duke@435	51	// For assertions
duke@435	52	Generation* generation() { return _gen; }
duke@435	53	CardTableRS* rs() { return _rs; }
duke@435	54
duke@435	55	// Derived classes that modify oops so that they might be old-to-young
duke@435	56	// pointers must call the method below.
coleenp@548	57	template <class T> void do_barrier(T* p);
duke@435	58
duke@435	59	public:
duke@435	60	OopsInGenClosure() : OopClosure(NULL),
duke@435	61	_orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
duke@435	62
duke@435	63	OopsInGenClosure(Generation* gen);
duke@435	64	void set_generation(Generation* gen);
duke@435	65
duke@435	66	void reset_generation() { _gen = _orig_gen; }
duke@435	67
duke@435	68	// Problem with static closures: must have _gen_boundary set at some point,
duke@435	69	// but cannot do this until after the heap is initialized.
duke@435	70	void set_orig_generation(Generation* gen) {
duke@435	71	_orig_gen = gen;
duke@435	72	set_generation(gen);
duke@435	73	}
duke@435	74
duke@435	75	HeapWord* gen_boundary() { return _gen_boundary; }
duke@435	76	};
duke@435	77
duke@435	78	// Closure for scanning DefNewGeneration.
duke@435	79	//
duke@435	80	// This closure will perform barrier store calls for ALL
duke@435	81	// pointers in scanned oops.
duke@435	82	class ScanClosure: public OopsInGenClosure {
coleenp@548	83	protected:
duke@435	84	DefNewGeneration* _g;
coleenp@548	85	HeapWord* _boundary;
coleenp@548	86	bool _gc_barrier;
coleenp@548	87	template <class T> inline void do_oop_work(T* p);
coleenp@548	88	public:
duke@435	89	ScanClosure(DefNewGeneration* g, bool gc_barrier);
coleenp@548	90	virtual void do_oop(oop* p);
coleenp@548	91	virtual void do_oop(narrowOop* p);
coleenp@548	92	inline void do_oop_nv(oop* p);
coleenp@548	93	inline void do_oop_nv(narrowOop* p);
duke@435	94	bool do_header() { return false; }
duke@435	95	Prefetch::style prefetch_style() {
duke@435	96	return Prefetch::do_write;
duke@435	97	}
duke@435	98	};
duke@435	99
duke@435	100	// Closure for scanning DefNewGeneration.
duke@435	101	//
duke@435	102	// This closure only performs barrier store calls on
duke@435	103	// pointers into the DefNewGeneration. This is less
duke@435	104	// precise, but faster, than a ScanClosure
duke@435	105	class FastScanClosure: public OopsInGenClosure {
coleenp@548	106	protected:
duke@435	107	DefNewGeneration* _g;
coleenp@548	108	HeapWord* _boundary;
coleenp@548	109	bool _gc_barrier;
coleenp@548	110	template <class T> inline void do_oop_work(T* p);
coleenp@548	111	public:
duke@435	112	FastScanClosure(DefNewGeneration* g, bool gc_barrier);
coleenp@548	113	virtual void do_oop(oop* p);
coleenp@548	114	virtual void do_oop(narrowOop* p);
coleenp@548	115	inline void do_oop_nv(oop* p);
coleenp@548	116	inline void do_oop_nv(narrowOop* p);
duke@435	117	bool do_header() { return false; }
duke@435	118	Prefetch::style prefetch_style() {
duke@435	119	return Prefetch::do_write;
duke@435	120	}
duke@435	121	};
duke@435	122
duke@435	123	class FilteringClosure: public OopClosure {
coleenp@548	124	private:
coleenp@548	125	HeapWord* _boundary;
duke@435	126	OopClosure* _cl;
coleenp@548	127	protected:
coleenp@548	128	template <class T> inline void do_oop_work(T* p) {
coleenp@548	129	T heap_oop = oopDesc::load_heap_oop(p);
coleenp@548	130	if (!oopDesc::is_null(heap_oop)) {
coleenp@548	131	oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
coleenp@548	132	if ((HeapWord*)obj < _boundary) {
coleenp@548	133	_cl->do_oop(p);
coleenp@548	134	}
coleenp@548	135	}
coleenp@548	136	}
coleenp@548	137	public:
duke@435	138	FilteringClosure(HeapWord* boundary, OopClosure* cl) :
duke@435	139	OopClosure(cl->_ref_processor), _boundary(boundary),
duke@435	140	_cl(cl) {}
coleenp@548	141	virtual void do_oop(oop* p);
coleenp@548	142	virtual void do_oop(narrowOop* p);
coleenp@548	143	inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); }
coleenp@548	144	inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); }
duke@435	145	bool do_header() { return false; }
duke@435	146	};
duke@435	147
duke@435	148	// Closure for scanning DefNewGeneration's weak references.
duke@435	149	// NOTE: very much like ScanClosure but not derived from
duke@435	150	// OopsInGenClosure -- weak references are processed all
duke@435	151	// at once, with no notion of which generation they were in.
duke@435	152	class ScanWeakRefClosure: public OopClosure {
coleenp@548	153	protected:
coleenp@548	154	DefNewGeneration* _g;
coleenp@548	155	HeapWord* _boundary;
coleenp@548	156	template <class T> inline void do_oop_work(T* p);
coleenp@548	157	public:
duke@435	158	ScanWeakRefClosure(DefNewGeneration* g);
coleenp@548	159	virtual void do_oop(oop* p);
coleenp@548	160	virtual void do_oop(narrowOop* p);
coleenp@548	161	inline void do_oop_nv(oop* p);
coleenp@548	162	inline void do_oop_nv(narrowOop* p);
duke@435	163	};
duke@435	164
duke@435	165	class VerifyOopClosure: public OopClosure {
coleenp@548	166	protected:
coleenp@548	167	template <class T> inline void do_oop_work(T* p) {
coleenp@548	168	oop obj = oopDesc::load_decode_heap_oop(p);
coleenp@548	169	guarantee(obj->is_oop_or_null(), "invalid oop");
duke@435	170	}
coleenp@548	171	public:
coleenp@548	172	virtual void do_oop(oop* p);
coleenp@548	173	virtual void do_oop(narrowOop* p);
duke@435	174	static VerifyOopClosure verify_oop;
duke@435	175	};