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src/share/vm/memory/defNewGeneration.inline.hpp@cff162798819 (annotated)

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

Sun, 11 Oct 2009 16:19:25 -0700

author

jcoomes

date

Sun, 11 Oct 2009 16:19:25 -0700

changeset 1844

cff162798819

parent 631

d1605aabd0a1

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6888953: some calls to function-like macros are missing semicolons
Reviewed-by: pbk, kvn

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
coleenp@548	25	// Methods of protected closure types
coleenp@548	26
coleenp@548	27	template <class T>
coleenp@548	28	inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) {
coleenp@548	29	#ifdef ASSERT
coleenp@548	30	{
coleenp@548	31	// We never expect to see a null reference being processed
coleenp@548	32	// as a weak reference.
coleenp@548	33	assert (!oopDesc::is_null(*p), "expected non-null ref");
coleenp@548	34	oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548	35	assert (obj->is_oop(), "expected an oop while scanning weak refs");
coleenp@548	36	}
coleenp@548	37	#endif // ASSERT
coleenp@548	38
coleenp@548	39	_cl->do_oop_nv(p);
coleenp@548	40
coleenp@548	41	// Card marking is trickier for weak refs.
coleenp@548	42	// This oop is a 'next' field which was filled in while we
coleenp@548	43	// were discovering weak references. While we might not need
coleenp@548	44	// to take a special action to keep this reference alive, we
coleenp@548	45	// will need to dirty a card as the field was modified.
coleenp@548	46	//
coleenp@548	47	// Alternatively, we could create a method which iterates through
coleenp@548	48	// each generation, allowing them in turn to examine the modified
coleenp@548	49	// field.
coleenp@548	50	//
coleenp@548	51	// We could check that p is also in an older generation, but
coleenp@548	52	// dirty cards in the youngest gen are never scanned, so the
coleenp@548	53	// extra check probably isn't worthwhile.
coleenp@548	54	if (Universe::heap()->is_in_reserved(p)) {
coleenp@548	55	oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548	56	_rs->inline_write_ref_field_gc(p, obj);
coleenp@548	57	}
duke@435	58	}
duke@435	59
coleenp@548	60	template <class T>
coleenp@548	61	inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) {
coleenp@548	62	#ifdef ASSERT
coleenp@548	63	{
coleenp@548	64	// We never expect to see a null reference being processed
coleenp@548	65	// as a weak reference.
coleenp@548	66	assert (!oopDesc::is_null(*p), "expected non-null ref");
coleenp@548	67	oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548	68	assert (obj->is_oop(), "expected an oop while scanning weak refs");
duke@435	69	}
coleenp@548	70	#endif // ASSERT
duke@435	71
coleenp@548	72	_cl->do_oop_nv(p);
coleenp@548	73
coleenp@548	74	// Optimized for Defnew generation if it's the youngest generation:
coleenp@548	75	// we set a younger_gen card if we have an older->youngest
coleenp@548	76	// generation pointer.
coleenp@548	77	oop obj = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548	78	if (((HeapWord*)obj < _boundary) && Universe::heap()->is_in_reserved(p)) {
coleenp@548	79	_rs->inline_write_ref_field_gc(p, obj);
duke@435	80	}
duke@435	81	}