Mercurial > hg > truffle
diff src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.inline.hpp @ 20317:ee019285a52c
8031323: Optionally align objects copied to survivor spaces
Reviewed-by: brutisso, tschatzl
author | jmasa |
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date | Mon, 04 Aug 2014 10:48:10 -0700 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/parallelScavenge/psPromotionLAB.inline.hpp Mon Aug 04 10:48:10 2014 -0700 @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_INLINE_HPP +#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_INLINE_HPP + +#include "gc_implementation/parallelScavenge/psPromotionLAB.hpp" +#include "gc_interface/collectedHeap.inline.hpp" + +HeapWord* PSYoungPromotionLAB::allocate(size_t size) { + // Can't assert this, when young fills, we keep the LAB around, but flushed. + // assert(_state != flushed, "Sanity"); + HeapWord* obj = CollectedHeap::align_allocation_or_fail(top(), end(), SurvivorAlignmentInBytes); + if (obj == NULL) { + return NULL; + } + + HeapWord* new_top = obj + size; + // The 'new_top>obj' check is needed to detect overflow of obj+size. + if (new_top > obj && new_top <= end()) { + set_top(new_top); + assert(is_ptr_aligned(obj, SurvivorAlignmentInBytes) && is_object_aligned((intptr_t)new_top), + "checking alignment"); + return obj; + } else { + set_top(obj); + return NULL; + } +} + +#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONLAB_INLINE_HPP