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src/share/vm/memory/genOopClosures.hpp@a61af66fc99e (annotated)

src/share/vm/memory/genOopClosures.hpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 548

ba764ed4b6f2

permissions

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duke@435	1	/*
duke@435	2	* Copyright 2001-2007 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	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
duke@435	31	// Closure for iterating roots from a particular generation
duke@435	32	// Note: all classes deriving from this MUST call this do_barrier
duke@435	33	// method at the end of their own do_oop method!
duke@435	34	// Note: no do_oop defined, this is an abstract class.
duke@435	35
duke@435	36	class OopsInGenClosure : public OopClosure {
duke@435	37	private:
duke@435	38	Generation* _orig_gen; // generation originally set in ctor
duke@435	39	Generation* _gen; // generation being scanned
duke@435	40
duke@435	41	protected:
duke@435	42	// Some subtypes need access.
duke@435	43	HeapWord* _gen_boundary; // start of generation
duke@435	44	CardTableRS* _rs; // remembered set
duke@435	45
duke@435	46	// For assertions
duke@435	47	Generation* generation() { return _gen; }
duke@435	48	CardTableRS* rs() { return _rs; }
duke@435	49
duke@435	50	// Derived classes that modify oops so that they might be old-to-young
duke@435	51	// pointers must call the method below.
duke@435	52	void do_barrier(oop* p);
duke@435	53
duke@435	54	public:
duke@435	55	OopsInGenClosure() : OopClosure(NULL),
duke@435	56	_orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
duke@435	57
duke@435	58	OopsInGenClosure(Generation* gen);
duke@435	59	void set_generation(Generation* gen);
duke@435	60
duke@435	61	void reset_generation() { _gen = _orig_gen; }
duke@435	62
duke@435	63	// Problem with static closures: must have _gen_boundary set at some point,
duke@435	64	// but cannot do this until after the heap is initialized.
duke@435	65	void set_orig_generation(Generation* gen) {
duke@435	66	_orig_gen = gen;
duke@435	67	set_generation(gen);
duke@435	68	}
duke@435	69
duke@435	70	HeapWord* gen_boundary() { return _gen_boundary; }
duke@435	71	};
duke@435	72
duke@435	73	// Closure for scanning DefNewGeneration.
duke@435	74	//
duke@435	75	// This closure will perform barrier store calls for ALL
duke@435	76	// pointers in scanned oops.
duke@435	77	class ScanClosure: public OopsInGenClosure {
duke@435	78	protected:
duke@435	79	DefNewGeneration* _g;
duke@435	80	HeapWord* _boundary;
duke@435	81	bool _gc_barrier;
duke@435	82	public:
duke@435	83	ScanClosure(DefNewGeneration* g, bool gc_barrier);
duke@435	84	void do_oop(oop* p);
duke@435	85	void do_oop_nv(oop* p);
duke@435	86	bool do_header() { return false; }
duke@435	87	Prefetch::style prefetch_style() {
duke@435	88	return Prefetch::do_write;
duke@435	89	}
duke@435	90	};
duke@435	91
duke@435	92	// Closure for scanning DefNewGeneration.
duke@435	93	//
duke@435	94	// This closure only performs barrier store calls on
duke@435	95	// pointers into the DefNewGeneration. This is less
duke@435	96	// precise, but faster, than a ScanClosure
duke@435	97	class FastScanClosure: public OopsInGenClosure {
duke@435	98	protected:
duke@435	99	DefNewGeneration* _g;
duke@435	100	HeapWord* _boundary;
duke@435	101	bool _gc_barrier;
duke@435	102	public:
duke@435	103	FastScanClosure(DefNewGeneration* g, bool gc_barrier);
duke@435	104	void do_oop(oop* p);
duke@435	105	void do_oop_nv(oop* p);
duke@435	106	bool do_header() { return false; }
duke@435	107	Prefetch::style prefetch_style() {
duke@435	108	return Prefetch::do_write;
duke@435	109	}
duke@435	110	};
duke@435	111
duke@435	112	class FilteringClosure: public OopClosure {
duke@435	113	HeapWord* _boundary;
duke@435	114	OopClosure* _cl;
duke@435	115	public:
duke@435	116	FilteringClosure(HeapWord* boundary, OopClosure* cl) :
duke@435	117	OopClosure(cl->_ref_processor), _boundary(boundary),
duke@435	118	_cl(cl) {}
duke@435	119	void do_oop(oop* p);
duke@435	120	void do_oop_nv(oop* p) {
duke@435	121	oop obj = *p;
duke@435	122	if ((HeapWord*)obj < _boundary && obj != NULL) {
duke@435	123	_cl->do_oop(p);
duke@435	124	}
duke@435	125	}
duke@435	126	bool do_header() { return false; }
duke@435	127	};
duke@435	128
duke@435	129	// Closure for scanning DefNewGeneration's weak references.
duke@435	130	// NOTE: very much like ScanClosure but not derived from
duke@435	131	// OopsInGenClosure -- weak references are processed all
duke@435	132	// at once, with no notion of which generation they were in.
duke@435	133	class ScanWeakRefClosure: public OopClosure {
duke@435	134	protected:
duke@435	135	DefNewGeneration* _g;
duke@435	136	HeapWord* _boundary;
duke@435	137	public:
duke@435	138	ScanWeakRefClosure(DefNewGeneration* g);
duke@435	139	void do_oop(oop* p);
duke@435	140	void do_oop_nv(oop* p);
duke@435	141	};
duke@435	142
duke@435	143	class VerifyOopClosure: public OopClosure {
duke@435	144	public:
duke@435	145	void do_oop(oop* p) {
duke@435	146	guarantee((*p)->is_oop_or_null(), "invalid oop");
duke@435	147	}
duke@435	148	static VerifyOopClosure verify_oop;
duke@435	149	};