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src/share/vm/oops/oop.pcgc.inline.hpp@a79cb7c55012 (annotated)

src/share/vm/oops/oop.pcgc.inline.hpp

Wed, 25 Jan 2012 17:40:51 -0500

author

jiangli

date

Wed, 25 Jan 2012 17:40:51 -0500

changeset 3526

a79cb7c55012

parent 2534

e5383553fd4e

child 4037

da91efe96a93

permissions

-rw-r--r--

7132690: InstanceKlass:_reference_type should be u1 type
Summary: Change InstanceKlass::_reference_type to u1 type.
Reviewed-by: dholmes, coleenp, acorn
Contributed-by: Jiangli Zhou <jiangli.zhou@oracle.com>

duke@435	1	/*
stefank@2534	2	* Copyright (c) 2005, 2011, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
stefank@2314	26	#define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
stefank@2314	27
stefank@2314	28	#ifndef SERIALGC
stefank@2314	29	#include "gc_implementation/parNew/parNewGeneration.hpp"
stefank@2314	30	#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
stefank@2314	31	#include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
stefank@2314	32	#include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
stefank@2314	33	#include "gc_implementation/parallelScavenge/psScavenge.hpp"
stefank@2314	34	#include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
stefank@2314	35	#endif
stefank@2314	36
duke@435	37	inline void oopDesc::update_contents(ParCompactionManager* cm) {
duke@435	38	// The klass field must be updated before anything else
duke@435	39	// can be done.
duke@435	40	DEBUG_ONLY(klassOopDesc* original_klass = klass());
duke@435	41
duke@435	42	// Can the option to update and/or copy be moved up in the
duke@435	43	// call chain to avoid calling into here?
duke@435	44
duke@435	45	if (PSParallelCompact::should_update_klass(klass())) {
duke@435	46	update_header();
duke@435	47	assert(klass()->is_klass(), "Not updated correctly");
duke@435	48	} else {
duke@435	49	assert(klass()->is_klass(), "Not updated");
duke@435	50	}
duke@435	51
duke@435	52	Klass* new_klass = blueprint();
duke@435	53	if (!new_klass->oop_is_typeArray()) {
duke@435	54	// It might contain oops beyond the header, so take the virtual call.
duke@435	55	new_klass->oop_update_pointers(cm, this);
duke@435	56	}
duke@435	57	// Else skip it. The typeArrayKlass in the header never needs scavenging.
duke@435	58	}
duke@435	59
duke@435	60	inline void oopDesc::follow_contents(ParCompactionManager* cm) {
duke@435	61	assert (PSParallelCompact::mark_bitmap()->is_marked(this),
duke@435	62	"should be marked");
duke@435	63	blueprint()->oop_follow_contents(cm, this);
duke@435	64	}
duke@435	65
duke@435	66	// Used by parallel old GC.
duke@435	67
duke@435	68	inline void oopDesc::follow_header(ParCompactionManager* cm) {
coleenp@548	69	if (UseCompressedOops) {
coleenp@548	70	PSParallelCompact::mark_and_push(cm, compressed_klass_addr());
coleenp@548	71	} else {
coleenp@548	72	PSParallelCompact::mark_and_push(cm, klass_addr());
coleenp@548	73	}
duke@435	74	}
duke@435	75
duke@435	76	inline oop oopDesc::forward_to_atomic(oop p) {
duke@435	77	assert(ParNewGeneration::is_legal_forward_ptr(p),
duke@435	78	"illegal forwarding pointer value.");
duke@435	79	markOop oldMark = mark();
duke@435	80	markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
duke@435	81	markOop curMark;
duke@435	82
duke@435	83	assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
duke@435	84	assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
duke@435	85
johnc@2334	86	while (!oldMark->is_marked()) {
duke@435	87	curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
johnc@2334	88	assert(is_forwarded(), "object should have been forwarded");
duke@435	89	if (curMark == oldMark) {
duke@435	90	return NULL;
duke@435	91	}
johnc@2334	92	// If the CAS was unsuccessful then curMark->is_marked()
johnc@2334	93	// should return true as another thread has CAS'd in another
johnc@2334	94	// forwarding pointer.
duke@435	95	oldMark = curMark;
duke@435	96	}
duke@435	97	return forwardee();
duke@435	98	}
duke@435	99
duke@435	100	inline void oopDesc::update_header() {
coleenp@548	101	if (UseCompressedOops) {
coleenp@548	102	PSParallelCompact::adjust_pointer(compressed_klass_addr());
coleenp@548	103	} else {
coleenp@548	104	PSParallelCompact::adjust_pointer(klass_addr());
coleenp@548	105	}
duke@435	106	}
duke@435	107
stefank@2314	108	#endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP