1 /*
   2  * Copyright (c) 2014, 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_LEAKPROFILER_LEAKPROFILER_HPP
  26 #define SHARE_VM_JFR_LEAKPROFILER_LEAKPROFILER_HPP
  27 
  28 #include "jfr/utilities/jfrTraceTime.hpp"
  29 #include "memory/allocation.hpp"
  30 
  31 class BoolObjectClosure;
  32 class ObjectSampler;
  33 class OopClosure;
  34 class Thread;
  35 
  36 class LeakProfiler : public AllStatic {
  37   friend class ClassUnloadConstantSet;
  38   friend class ConstantSet;
  39   friend class ObjectSampleCheckpoint;
  40   friend class StartOperation;
  41   friend class StopOperation;
  42   friend class EmitEventOperation;
  43   friend class WriteObjectSampleStacktrace;
  44 
  45  private:
  46   static ObjectSampler* _object_sampler;
  47   static JfrTraceTime _last_sweep;
  48 
  49   static void set_object_sampler(ObjectSampler* object_sampler);
  50   static ObjectSampler* object_sampler();
  51 
  52   static void suspend();
  53   static void resume();
  54   static bool is_suspended();
  55 
  56  public:
  57   static bool start(jint sample_count);
  58   static bool stop();
  59   static void emit_events(jlong cutoff_ticks, bool emit_all);
  60   static bool is_running();
  61 
  62   static void sample(HeapWord* object, size_t size, JavaThread* thread);
  63 
  64   // Called by GC
  65   static void oops_do(BoolObjectClosure* is_alive, OopClosure* f);
  66 };
  67 
  68 #endif // SHARE_VM_JFR_LEAKPROFILER_LEAKPROFILER_HPP