1 /*
2 * Copyright (c) 2003, 2020, 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 #include "precompiled.hpp"
26 #include "runtime/orderAccess.hpp"
27 #include "runtime/stubRoutines.hpp"
28
29 #ifndef PRODUCT
30 #include "runtime/thread.hpp"
31 #endif
32
StubRoutines_fence()33 void OrderAccess::StubRoutines_fence() {
34 // Use a stub if it exists. It may not exist during bootstrap so do
35 // nothing in that case but assert if no fence code exists after threads have been created
36 void (*func)() = CAST_TO_FN_PTR(void (*)(), StubRoutines::fence_entry());
37
38 if (func != NULL) {
39 (*func)();
40 return;
41 }
42 assert(Threads::number_of_threads() == 0, "for bootstrap only");
43 }
44
45 #ifndef PRODUCT
cross_modify_fence_verify()46 void OrderAccess::cross_modify_fence_verify() {
47 if (VerifyCrossModifyFence) {
48 JavaThread::current()->set_requires_cross_modify_fence(false);
49 }
50 }
51 #endif
52