/*

 * Copyright (c) 1997, 2010, 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.

 *

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 */

#ifndef SHARE_VM_RUNTIME_APROFILER_HPP

#define SHARE_VM_RUNTIME_APROFILER_HPP

#include "memory/allocation.hpp"

#include "memory/universe.hpp"

#include "oops/klass.hpp"

#include "oops/klassOop.hpp"

#include "utilities/top.hpp"

// A simple allocation profiler for Java. The profiler collects and prints

// the number and total size of instances allocated per class, including

// array classes.

//

// The profiler is currently global for all threads. It can be changed to a

// per threads profiler by keeping a more elaborate data structure and calling

// iterate_since_last_scavenge at thread switches.

class AllocationProfiler: AllStatic {

  friend class GenCollectedHeap;

  friend class G1CollectedHeap;

  friend class MarkSweep;

 private:

  static bool _active;                          // tells whether profiler is active

  static GrowableArray<klassOop>* _print_array; // temporary array for printing

  // Utility printing functions

  static void add_class_to_array(klassOop k);

  static void add_classes_to_array(klassOop k);

  static int  compare_classes(klassOop* k1, klassOop* k2);

  static int  average(size_t alloc_size, int alloc_count);

  static void sort_and_print_array(size_t cutoff);

  // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage.

  static void iterate_since_last_gc();

 public:

  // Start profiler

  static void engage();

  // Stop profiler

  static void disengage();

  // Tells whether profiler is active

  static bool is_active()                   { return _active; }

  // Print profile

  static void print(size_t cutoff);   // Cutoff in total allocation size (in words)

};

#endif // SHARE_VM_RUNTIME_APROFILER_HPP