6700789: G1: Enable use of compressed oops with G1 heaps
Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
/*
* Copyright 2000-2002 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.
*
*/
//////////////////////////////////////////////////////////////////////////
// BlockOffsetTable inlines
//////////////////////////////////////////////////////////////////////////
inline HeapWord* BlockOffsetTable::block_start(const void* addr) const {
if (addr >= _bottom && addr < _end) {
return block_start_unsafe(addr);
} else {
return NULL;
}
}
//////////////////////////////////////////////////////////////////////////
// BlockOffsetSharedArray inlines
//////////////////////////////////////////////////////////////////////////
inline size_t BlockOffsetSharedArray::index_for(const void* p) const {
char* pc = (char*)p;
assert(pc >= (char*)_reserved.start() &&
pc < (char*)_reserved.end(),
"p not in range.");
size_t delta = pointer_delta(pc, _reserved.start(), sizeof(char));
size_t result = delta >> LogN;
assert(result < _vs.committed_size(), "bad index from address");
return result;
}
inline HeapWord* BlockOffsetSharedArray::address_for_index(size_t index) const {
assert(index < _vs.committed_size(), "bad index");
HeapWord* result = _reserved.start() + (index << LogN_words);
assert(result >= _reserved.start() && result < _reserved.end(),
"bad address from index");
return result;
}
//////////////////////////////////////////////////////////////////////////
// BlockOffsetArrayNonContigSpace inlines
//////////////////////////////////////////////////////////////////////////
inline void BlockOffsetArrayNonContigSpace::freed(HeapWord* blk_start,
HeapWord* blk_end) {
// Verify that the BOT shows [blk_start, blk_end) to be one block.
verify_single_block(blk_start, blk_end);
// adjust _unallocated_block upward or downward
// as appropriate
if (BlockOffsetArrayUseUnallocatedBlock) {
assert(_unallocated_block <= _end,
"Inconsistent value for _unallocated_block");
if (blk_end >= _unallocated_block && blk_start <= _unallocated_block) {
// CMS-specific note: a block abutting _unallocated_block to
// its left is being freed, a new block is being added or
// we are resetting following a compaction
_unallocated_block = blk_start;
}
}
}