1 /*
 2  * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
 3  * Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  *
24  */
25 
26 #ifndef SHARE_RUNTIME_THREADWXSETTERS_INLINE_HPP
27 #define SHARE_RUNTIME_THREADWXSETTERS_INLINE_HPP
28 
29 // No threadWXSetters.hpp
30 
31 #ifdef MACOS_AARCH64
32 
33 #include "classfile/classLoader.hpp"
34 #include "runtime/perfData.inline.hpp"
35 #include "runtime/thread.inline.hpp"
36 
37 class ThreadWXEnable  {
38   Thread* _thread;
39   WXMode _old_mode;
40   WXMode *_this_wx_mode;
41   ThreadWXEnable *_prev;
42 public:
43   ThreadWXEnable(WXMode* new_mode, Thread* thread) :
44     _thread(thread), _this_wx_mode(new_mode) {
45     NOT_PRODUCT(PerfTraceElapsedTime ptt(ClassLoader::perf_change_wx_time());)
46     JavaThread* javaThread
47       = _thread && _thread->is_Java_thread()
48                 ? JavaThread::cast(_thread) : nullptr;
49     _prev = javaThread != nullptr ? javaThread->_cur_wx_enable: nullptr;
50     _old_mode = _thread != nullptr ? _thread->enable_wx(*new_mode) : WXWrite;
51     if (javaThread != nullptr) {
52       javaThread->_cur_wx_enable = this;
53       javaThread->_cur_wx_mode = new_mode;
54     }
55   }
56   ThreadWXEnable(WXMode new_mode, Thread* thread) :
57     _thread(thread), _this_wx_mode(nullptr) {
58     NOT_PRODUCT(PerfTraceElapsedTime ptt(ClassLoader::perf_change_wx_time());)
59     JavaThread* javaThread
60       = _thread && _thread->is_Java_thread()
61         ? JavaThread::cast(_thread) : nullptr;
62     _prev = javaThread != nullptr ? javaThread->_cur_wx_enable: nullptr;
63     _old_mode = _thread != nullptr ? _thread->enable_wx(new_mode) : WXWrite;
64     if (javaThread) {
65       javaThread->_cur_wx_enable = this;
66       javaThread->_cur_wx_mode = nullptr;
67     }
68   }
69 
70   ~ThreadWXEnable() {
71     NOT_PRODUCT(PerfTraceElapsedTime ptt(ClassLoader::perf_change_wx_time());)
72     if (_thread) {
73       _thread->enable_wx(_old_mode);
74       JavaThread* javaThread
75         = _thread && _thread->is_Java_thread()
76           ? JavaThread::cast(_thread) : nullptr;
77       if (javaThread != nullptr) {
78         javaThread->_cur_wx_enable = _prev;
79         javaThread->_cur_wx_mode = _prev != nullptr ? _prev->_this_wx_mode : nullptr;
80       }
81     }
82   }
83 
84   static bool test(address p);
85 };
86 #endif // MACOS_AARCH64
87 
88 #endif // SHARE_RUNTIME_THREADWXSETTERS_INLINE_HPP
89