src/hotspot/share/runtime/threadWXSetters.inline.hpp - master - githubmirror/panama-vector

src/hotspot/share/runtime/threadWXSetters.inline.hpp
88 строк3 KB
David Holmes
8377948: The ThreadWXEnable use of PerfTraceTime is not safe during VM shutdown
25 фев 2026, 23:11
25 фев 2026, 23:118ba3de9
/*
 * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_RUNTIME_THREADWXSETTERS_INLINE_HPP
#define SHARE_RUNTIME_THREADWXSETTERS_INLINE_HPP

// No threadWXSetters.hpp

#ifdef MACOS_AARCH64

#include "classfile/classLoader.hpp"
#include "runtime/perfData.inline.hpp"
#include "runtime/thread.inline.hpp"

class ThreadWXEnable  {
  Thread* _thread;
  WXMode _old_mode;
  WXMode *_this_wx_mode;
  ThreadWXEnable *_prev;
public:
  ThreadWXEnable(WXMode* new_mode, Thread* thread) :
    _thread(thread), _this_wx_mode(new_mode) {
    NOT_PRODUCT(SafePerfTraceTime ptt(ClassLoader::perf_change_wx_time());)
    JavaThread* javaThread
      = _thread && _thread->is_Java_thread()
                ? JavaThread::cast(_thread) : nullptr;
    _prev = javaThread != nullptr ? javaThread->_cur_wx_enable: nullptr;
    _old_mode = _thread != nullptr ? _thread->enable_wx(*new_mode) : WXWrite;
    if (javaThread != nullptr) {
      javaThread->_cur_wx_enable = this;
      javaThread->_cur_wx_mode = new_mode;
    }
  }
  ThreadWXEnable(WXMode new_mode, Thread* thread) :
    _thread(thread), _this_wx_mode(nullptr) {
    NOT_PRODUCT(SafePerfTraceTime ptt(ClassLoader::perf_change_wx_time());)
    JavaThread* javaThread
      = _thread && _thread->is_Java_thread()
        ? JavaThread::cast(_thread) : nullptr;
    _prev = javaThread != nullptr ? javaThread->_cur_wx_enable: nullptr;
    _old_mode = _thread != nullptr ? _thread->enable_wx(new_mode) : WXWrite;
    if (javaThread) {
      javaThread->_cur_wx_enable = this;
      javaThread->_cur_wx_mode = nullptr;
    }
  }

  ~ThreadWXEnable() {
    NOT_PRODUCT(SafePerfTraceTime ptt(ClassLoader::perf_change_wx_time());)
    if (_thread) {
      _thread->enable_wx(_old_mode);
      JavaThread* javaThread
        = _thread && _thread->is_Java_thread()
          ? JavaThread::cast(_thread) : nullptr;
      if (javaThread != nullptr) {
        javaThread->_cur_wx_enable = _prev;
        javaThread->_cur_wx_mode = _prev != nullptr ? _prev->_this_wx_mode : nullptr;
      }
    }
  }

  static bool test(address p);
};
#endif // MACOS_AARCH64

#endif // SHARE_RUNTIME_THREADWXSETTERS_INLINE_HPP