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src/share/vm/memory/genOopClosures.inline.hpp@ba764ed4b6f2 (annotated)

src/share/vm/memory/genOopClosures.inline.hpp

Sun, 13 Apr 2008 17:43:42 -0400

author

coleenp

date

Sun, 13 Apr 2008 17:43:42 -0400

changeset 548

ba764ed4b6f2

parent 435

a61af66fc99e

child 631

d1605aabd0a1

child 777

37f87013dfd8

permissions

-rw-r--r--

6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold

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	inline OopsInGenClosure::OopsInGenClosure(Generation* gen) :
duke@435	26	OopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) {
duke@435	27	set_generation(gen);
duke@435	28	}
duke@435	29
duke@435	30	inline void OopsInGenClosure::set_generation(Generation* gen) {
duke@435	31	_gen = gen;
duke@435	32	_gen_boundary = _gen->reserved().start();
duke@435	33	// Barrier set for the heap, must be set after heap is initialized
duke@435	34	if (_rs == NULL) {
duke@435	35	GenRemSet* rs = SharedHeap::heap()->rem_set();
duke@435	36	assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind");
duke@435	37	_rs = (CardTableRS*)rs;
duke@435	38	}
duke@435	39	}
duke@435	40
coleenp@548	41	template <class T> inline void OopsInGenClosure::do_barrier(T* p) {
duke@435	42	assert(generation()->is_in_reserved(p), "expected ref in generation");
coleenp@548	43	assert(!oopDesc::is_null(*p), "expected non-null object");
coleenp@548	44	oop obj = oopDesc::load_decode_heap_oop_not_null(p);
duke@435	45	// If p points to a younger generation, mark the card.
duke@435	46	if ((HeapWord*)obj < _gen_boundary) {
duke@435	47	_rs->inline_write_ref_field_gc(p, obj);
duke@435	48	}
duke@435	49	}
duke@435	50
duke@435	51	// NOTE! Any changes made here should also be made
coleenp@548	52	// in FastScanClosure::do_oop_work()
coleenp@548	53	template <class T> inline void ScanClosure::do_oop_work(T* p) {
coleenp@548	54	T heap_oop = oopDesc::load_heap_oop(p);
duke@435	55	// Should we copy the obj?
coleenp@548	56	if (!oopDesc::is_null(heap_oop)) {
coleenp@548	57	oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
duke@435	58	if ((HeapWord*)obj < _boundary) {
duke@435	59	assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
coleenp@548	60	oop new_obj = obj->is_forwarded() ? obj->forwardee()
coleenp@548	61	: _g->copy_to_survivor_space(obj);
coleenp@548	62	oopDesc::encode_store_heap_oop_not_null(p, new_obj);
duke@435	63	}
duke@435	64	if (_gc_barrier) {
duke@435	65	// Now call parent closure
duke@435	66	do_barrier(p);
duke@435	67	}
duke@435	68	}
duke@435	69	}
duke@435	70
coleenp@548	71	inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); }
coleenp@548	72	inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); }
duke@435	73
duke@435	74	// NOTE! Any changes made here should also be made
coleenp@548	75	// in ScanClosure::do_oop_work()
coleenp@548	76	template <class T> inline void FastScanClosure::do_oop_work(T* p) {
coleenp@548	77	T heap_oop = oopDesc::load_heap_oop(p);
duke@435	78	// Should we copy the obj?
coleenp@548	79	if (!oopDesc::is_null(heap_oop)) {
coleenp@548	80	oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
duke@435	81	if ((HeapWord*)obj < _boundary) {
duke@435	82	assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
coleenp@548	83	oop new_obj = obj->is_forwarded() ? obj->forwardee()
coleenp@548	84	: _g->copy_to_survivor_space(obj);
coleenp@548	85	oopDesc::encode_store_heap_oop_not_null(p, new_obj);
duke@435	86	if (_gc_barrier) {
duke@435	87	// Now call parent closure
duke@435	88	do_barrier(p);
duke@435	89	}
duke@435	90	}
duke@435	91	}
duke@435	92	}
duke@435	93
coleenp@548	94	inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); }
coleenp@548	95	inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); }
duke@435	96
duke@435	97	// Note similarity to ScanClosure; the difference is that
duke@435	98	// the barrier set is taken care of outside this closure.
coleenp@548	99	template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) {
coleenp@548	100	assert(!oopDesc::is_null(*p), "null weak reference?");
coleenp@548	101	oop obj = oopDesc::load_decode_heap_oop_not_null(p);
duke@435	102	// weak references are sometimes scanned twice; must check
duke@435	103	// that to-space doesn't already contain this object
duke@435	104	if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
coleenp@548	105	oop new_obj = obj->is_forwarded() ? obj->forwardee()
coleenp@548	106	: _g->copy_to_survivor_space(obj);
coleenp@548	107	oopDesc::encode_store_heap_oop_not_null(p, new_obj);
duke@435	108	}
duke@435	109	}
duke@435	110
coleenp@548	111	inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); }
coleenp@548	112	inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); }