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 
  25 #ifndef SHARE_VM_JFR_JFR_HPP
  26 #define SHARE_VM_JFR_JFR_HPP
  27 
  28 #include "jni.h"
  29 #include "memory/allocation.hpp"
  30 
  31 class BoolObjectClosure;
  32 class JavaThread;
  33 class OopClosure;
  34 class Thread;
  35 
  36 extern "C" void JNICALL jfr_register_natives(JNIEnv*, jclass);
  37 
  38 //
  39 // The VM interface to Flight Recorder.
  40 //
  41 class Jfr : AllStatic {
  42  public:
  43   static bool is_enabled();
  44   static bool is_disabled();
  45   static bool is_recording();
  46   static void on_vm_init();
  47   static void on_vm_start();
  48   static void on_unloading_classes();
  49   static void on_thread_start(Thread* thread);
  50   static void on_thread_exit(Thread* thread);
  51   static void on_java_thread_dismantle(JavaThread* jt);
  52   static void on_vm_shutdown(bool exception_handler = false);
  53   static bool on_flight_recorder_option(const JavaVMOption** option, char* delimiter);
  54   static bool on_start_flight_recording_option(const JavaVMOption** option, char* delimiter);
  55   static void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f);
  56   static void weak_oops_do(OopClosure* f);
  57   static Thread* sampler_thread();
  58 };
  59 
  60 #endif // SHARE_VM_JFR_JFR_HPP