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_LEAKPROFILER_EMITEVENTOPERATION_HPP
  26 #define SHARE_VM_LEAKPROFILER_EMITEVENTOPERATION_HPP
  27 
  28 #include "runtime/vmOperations.hpp"
  29 
  30 class BFSClosure;
  31 class EdgeStore;
  32 class EdgeQueue;
  33 class JfrThreadData;
  34 class ObjectSample;
  35 class ObjectSampler;
  36 
  37 // Safepoint operation for emitting object sample events
  38 class EmitEventOperation : public VM_Operation {
  39  private:
  40   jlong _cutoff_ticks;
  41   bool _emit_all;
  42   VMThread* _vm_thread;
  43   JfrThreadLocal* _vm_thread_local;
  44   ObjectSampler* _object_sampler;
  45 
  46   void write_event(const ObjectSample* sample, EdgeStore* edge_store);
  47   int write_events(EdgeStore* edge_store);
  48 
  49  public:
  50   EmitEventOperation(jlong cutoff_ticks, bool emit_all) :
  51     _cutoff_ticks(cutoff_ticks),
  52     _emit_all(emit_all),
  53     _vm_thread(NULL),
  54     _vm_thread_local(NULL),
  55     _object_sampler(NULL) {
  56   }
  57 
  58   VMOp_Type type() const {
  59     return VMOp_GC_HeapInspection;
  60   }
  61 
  62   Mode evaluation_mode() const {
  63     return _safepoint;
  64   }
  65 
  66   virtual void doit();
  67 };
  68 
  69 #endif // SHARE_VM_LEAKPROFILER_EMITEVENTOPERATION_HPP