1 /*
2 * Copyright (c) 2001, 2018, 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
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP
26 #define SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP
27
28 #include "gc/shared/collectedHeap.hpp"
29 #include "oops/oop.inline.hpp"
30 #include "utilities/align.hpp"
31
align_allocation_or_fail(HeapWord * addr,HeapWord * end,unsigned short alignment_in_bytes)32 inline HeapWord* CollectedHeap::align_allocation_or_fail(HeapWord* addr,
33 HeapWord* end,
34 unsigned short alignment_in_bytes) {
35 if (alignment_in_bytes <= ObjectAlignmentInBytes) {
36 return addr;
37 }
38
39 assert(is_aligned(addr, HeapWordSize),
40 "Address " PTR_FORMAT " is not properly aligned.", p2i(addr));
41 assert(is_aligned(alignment_in_bytes, HeapWordSize),
42 "Alignment size %u is incorrect.", alignment_in_bytes);
43
44 HeapWord* new_addr = align_up(addr, alignment_in_bytes);
45 size_t padding = pointer_delta(new_addr, addr);
46
47 if (padding == 0) {
48 return addr;
49 }
50
51 if (padding < CollectedHeap::min_fill_size()) {
52 padding += alignment_in_bytes / HeapWordSize;
53 assert(padding >= CollectedHeap::min_fill_size(),
54 "alignment_in_bytes %u is expect to be larger "
55 "than the minimum object size", alignment_in_bytes);
56 new_addr = addr + padding;
57 }
58
59 assert(new_addr > addr, "Unexpected arithmetic overflow "
60 PTR_FORMAT " not greater than " PTR_FORMAT, p2i(new_addr), p2i(addr));
61 if(new_addr < end) {
62 CollectedHeap::fill_with_object(addr, padding);
63 return new_addr;
64 } else {
65 return NULL;
66 }
67 }
68
69 #endif // SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP
70