Thu, 07 Sep 2017 09:17:43 -0400
8072428: Enable UseLoopCounter ergonomically if on-stack-replacement is enabled
Summary: Set UseLoopCounter ergonomically if on-stack-replacement is enabled. Print warning.
Reviewed-by: kvn
1 /*
2 * Copyright (c) 1997, 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.
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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 */
25 #include "precompiled.hpp"
26 #include "runtime/thread.inline.hpp"
27 #include "runtime/threadLocalStorage.hpp"
28 #ifdef TARGET_OS_FAMILY_linux
29 # include "os_linux.inline.hpp"
30 #endif
31 #ifdef TARGET_OS_FAMILY_solaris
32 # include "os_solaris.inline.hpp"
33 #endif
34 #ifdef TARGET_OS_FAMILY_windows
35 # include "os_windows.inline.hpp"
36 #endif
37 #ifdef TARGET_OS_FAMILY_bsd
38 # include "os_bsd.inline.hpp"
39 #endif
41 // Solaris no longer has this kind of ThreadLocalStorage implementation.
42 // This will be removed from all platforms in the near future.
44 #ifndef SOLARIS
46 // static member initialization
47 int ThreadLocalStorage::_thread_index = -1;
49 Thread* ThreadLocalStorage::get_thread_slow() {
50 return (Thread*) os::thread_local_storage_at(ThreadLocalStorage::thread_index());
51 }
53 void ThreadLocalStorage::set_thread(Thread* thread) {
54 pd_set_thread(thread);
56 // The following ensure that any optimization tricks we have tried
57 // did not backfire on us:
58 guarantee(get_thread() == thread, "must be the same thread, quickly");
59 guarantee(get_thread_slow() == thread, "must be the same thread, slowly");
60 }
62 void ThreadLocalStorage::init() {
63 assert(!is_initialized(),
64 "More than one attempt to initialize threadLocalStorage");
65 pd_init();
66 set_thread_index(os::allocate_thread_local_storage());
67 generate_code_for_get_thread();
68 }
70 bool ThreadLocalStorage::is_initialized() {
71 return (thread_index() != -1);
72 }
74 #endif // SOLARIS