6687581: Make CMS work with compressed oops
Summary: Make FreeChunk read markword instead of LSB in _klass pointer to indicate that it's a FreeChunk for compressed oops.
Reviewed-by: ysr, jmasa
/*
* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
#define VM_STRUCTS_CMS(nonstatic_field, \
volatile_nonstatic_field, \
static_field) \
nonstatic_field(CompactibleFreeListSpace, _collector, CMSCollector*) \
nonstatic_field(CompactibleFreeListSpace, _bt, BlockOffsetArrayNonContigSpace) \
\
nonstatic_field(CMSPermGen, _gen, ConcurrentMarkSweepGeneration*) \
nonstatic_field(CMSBitMap, _bmStartWord, HeapWord*) \
nonstatic_field(CMSBitMap, _bmWordSize, size_t) \
nonstatic_field(CMSBitMap, _shifter, const int) \
nonstatic_field(CMSBitMap, _bm, BitMap) \
nonstatic_field(CMSBitMap, _virtual_space, VirtualSpace) \
nonstatic_field(CMSCollector, _markBitMap, CMSBitMap) \
nonstatic_field(ConcurrentMarkSweepGeneration, _cmsSpace, CompactibleFreeListSpace*) \
static_field(ConcurrentMarkSweepThread, _collector, CMSCollector*) \
volatile_nonstatic_field(FreeChunk, _size, size_t) \
nonstatic_field(FreeChunk, _next, FreeChunk*) \
nonstatic_field(FreeChunk, _prev, FreeChunk*)
#define VM_TYPES_CMS(declare_type, \
declare_toplevel_type) \
\
declare_type(ConcurrentMarkSweepGeneration,CardGeneration) \
declare_type(CompactibleFreeListSpace, CompactibleSpace) \
declare_type(CMSPermGenGen, ConcurrentMarkSweepGeneration) \
declare_type(CMSPermGen, PermGen) \
declare_type(ConcurrentMarkSweepThread, NamedThread) \
declare_type(SurrogateLockerThread, JavaThread) \
declare_toplevel_type(CMSCollector) \
declare_toplevel_type(CMSBitMap) \
declare_toplevel_type(FreeChunk) \
declare_toplevel_type(ConcurrentMarkSweepThread*) \
declare_toplevel_type(ConcurrentMarkSweepGeneration*) \
declare_toplevel_type(SurrogateLockerThread*) \
declare_toplevel_type(CompactibleFreeListSpace*) \
declare_toplevel_type(CMSCollector*) \
declare_toplevel_type(FreeChunk*)
#define VM_INT_CONSTANTS_CMS(declare_constant) \
declare_constant(Generation::ConcurrentMarkSweep) \
declare_constant(PermGen::ConcurrentMarkSweep)