psPromotionLAB.inline.hpp revision 13249:a2753984d2c1 
1/*
2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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23 */
24
25#ifndef SHARE_VM_GC_PARALLEL_PSPROMOTIONLAB_INLINE_HPP
26#define SHARE_VM_GC_PARALLEL_PSPROMOTIONLAB_INLINE_HPP
27
28#include "gc/parallel/psPromotionLAB.hpp"
29#include "gc/shared/collectedHeap.inline.hpp"
30#include "utilities/align.hpp"
31
32HeapWord* PSYoungPromotionLAB::allocate(size_t size) {
33  // Can't assert this, when young fills, we keep the LAB around, but flushed.
34  // assert(_state != flushed, "Sanity");
35  HeapWord* obj = CollectedHeap::align_allocation_or_fail(top(), end(), SurvivorAlignmentInBytes);
36  if (obj == NULL) {
37    return NULL;
38  }
39
40  HeapWord* new_top = obj + size;
41  // The 'new_top>obj' check is needed to detect overflow of obj+size.
42  if (new_top > obj && new_top <= end()) {
43    set_top(new_top);
44    assert(is_aligned(obj, SurvivorAlignmentInBytes) && is_object_aligned(new_top),
45           "checking alignment");
46    return obj;
47  } else {
48    set_top(obj);
49    return NULL;
50  }
51}
52
53#endif // SHARE_VM_GC_PARALLEL_PSPROMOTIONLAB_INLINE_HPP
54