1/*
2 * Copyright (c) 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#include "precompiled.hpp"
25#include "runtime/objectMonitor.hpp"
26#include "runtime/vm_version.hpp"
27#include "unittest.hpp"
28
29TEST_VM(ObjectMonitor, sanity) {
30
31 EXPECT_EQ(0, ObjectMonitor::header_offset_in_bytes()) << "Offset for _header must be zero.";
32
33 uint cache_line_size = VM_Version::L1_data_cache_line_size();
34
35 if (cache_line_size != 0) {
36 // We were able to determine the L1 data cache line size so
37 // do some cache line specific sanity checks
38 EXPECT_EQ((size_t) 0, sizeof (PaddedEnd<ObjectMonitor>) % cache_line_size)
39 << "PaddedEnd<ObjectMonitor> size is not a "
40 << "multiple of a cache line which permits false sharing. "
41 << "sizeof(PaddedEnd<ObjectMonitor>) = "
42 << sizeof (PaddedEnd<ObjectMonitor>)
43 << "; cache_line_size = " << cache_line_size;
44
45 EXPECT_GE((size_t) ObjectMonitor::owner_offset_in_bytes(), cache_line_size)
46 << "the _header and _owner fields are closer "
47 << "than a cache line which permits false sharing.";
48 }
49}
50