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 /*

  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. 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_VM_GC_IMPLEMENTATION_SHARED_GCTIMER_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GCTIMER_HPP

 #include "memory/allocation.hpp"

 #include "prims/jni_md.h"

 #include "utilities/macros.hpp"

 #include "utilities/ticks.hpp"

 class ConcurrentPhase;

 class GCPhase;

 class PausePhase;

 template <class E> class GrowableArray;

 class PhaseVisitor {

  public:

   virtual void visit(GCPhase* phase) = 0;

   virtual void visit(PausePhase* phase) { visit((GCPhase*)phase); }

   virtual void visit(ConcurrentPhase* phase) { visit((GCPhase*)phase); }

 };

 class GCPhase {

   const char* _name;

   int _level;

   Ticks _start;

   Ticks _end;

  public:

   void set_name(const char* name) { _name = name; }

   const char* name() const { return _name; }

   int level() const { return _level; }

   void set_level(int level) { _level = level; }

   const Ticks start() const { return _start; }

   void set_start(const Ticks& time) { _start = time; }

   const Ticks end() const { return _end; }

   void set_end(const Ticks& time) { _end = time; }

   virtual void accept(PhaseVisitor* visitor) = 0;

 };

 class PausePhase : public GCPhase {

  public:

   void accept(PhaseVisitor* visitor) {

     visitor->visit(this);

   }

 };

 class ConcurrentPhase : public GCPhase {

   void accept(PhaseVisitor* visitor) {

     visitor->visit(this);

   }

 };

 class PhasesStack {

  public:

   // FIXME: Temporary set to 5 (used to be 4), since Reference processing needs it.

   static const int PHASE_LEVELS = 5;

  private:

   int _phase_indices[PHASE_LEVELS];

   int _next_phase_level;

  public:

   PhasesStack() { clear(); }

   void clear();

   void push(int phase_index);

   int pop();

   int count() const;

 };

 class TimePartitions {

   static const int INITIAL_CAPACITY = 10;

   // Currently we only support pause phases.

   GrowableArray<PausePhase>* _phases;

   PhasesStack _active_phases;

   Tickspan _sum_of_pauses;

   Tickspan _longest_pause;

  public:

   TimePartitions();

   ~TimePartitions();

   void clear();

   void report_gc_phase_start(const char* name, const Ticks& time);

   void report_gc_phase_end(const Ticks& time);

   int num_phases() const;

   GCPhase* phase_at(int index) const;

   const Tickspan sum_of_pauses() const { return _sum_of_pauses; }

   const Tickspan longest_pause() const { return _longest_pause; }

   bool has_active_phases();

  private:

   void update_statistics(GCPhase* phase);

 };

 class PhasesIterator {

  public:

   virtual bool has_next() = 0;

   virtual GCPhase* next() = 0;

 };

 class GCTimer : public ResourceObj {

   NOT_PRODUCT(friend class GCTimerTest;)

  protected:

   Ticks _gc_start;

   Ticks _gc_end;

   TimePartitions _time_partitions;

  public:

   virtual void register_gc_start(const Ticks& time = Ticks::now());

   virtual void register_gc_end(const Ticks& time = Ticks::now());

   void register_gc_phase_start(const char* name, const Ticks& time);

   void register_gc_phase_end(const Ticks& time);

   const Ticks gc_start() const { return _gc_start; }

   const Ticks gc_end() const { return _gc_end; }

   TimePartitions* time_partitions() { return &_time_partitions; }

  protected:

   void register_gc_pause_start(const char* name, const Ticks& time = Ticks::now());

   void register_gc_pause_end(const Ticks& time = Ticks::now());

 };

 class STWGCTimer : public GCTimer {

  public:

   virtual void register_gc_start(const Ticks& time = Ticks::now());

   virtual void register_gc_end(const Ticks& time = Ticks::now());

 };

 class ConcurrentGCTimer : public GCTimer {

  public:

   void register_gc_pause_start(const char* name);

   void register_gc_pause_end();

 };

 class TimePartitionPhasesIterator {

   TimePartitions* _time_partitions;

   int _next;

  public:

   TimePartitionPhasesIterator(TimePartitions* time_partitions) : _time_partitions(time_partitions), _next(0) { }

   virtual bool has_next();

   virtual GCPhase* next();

 };

 /////////////// Unit tests ///////////////

 #ifndef PRODUCT

 class GCTimerAllTest {

  public:

   static void all();

 };

 #endif

 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GCTIMER_HPP