/*

 * Copyright (c) 2005, 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.

 *

 * 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_SERVICES_HEAPDUMPER_HPP

#define SHARE_VM_SERVICES_HEAPDUMPER_HPP

#include "memory/allocation.hpp"

#include "oops/klassOop.hpp"

#include "oops/oop.hpp"

#include "runtime/os.hpp"

// HeapDumper is used to dump the java heap to file in HPROF binary format:

//

//  { HeapDumper dumper(true /* full GC before heap dump */);

//    if (dumper.dump("/export/java.hprof")) {

//      ResourceMark rm;

//      tty->print_cr("Dump failed: %s", dumper.error_as_C_string());

//    } else {

//      // dump succeeded

//    }

//  }

//

class HeapDumper : public StackObj {

 private:

  char* _error;

  bool _print_to_tty;

  bool _gc_before_heap_dump;

  bool _oome;

  elapsedTimer _t;

  HeapDumper(bool gc_before_heap_dump, bool print_to_tty, bool oome) :

    _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(print_to_tty), _oome(oome) { }

  // string representation of error

  char* error() const                   { return _error; }

  void set_error(char* error);

  // indicates if progress messages can be sent to tty

  bool print_to_tty() const             { return _print_to_tty; }

  // internal timer.

  elapsedTimer* timer()                 { return &_t; }

  static void dump_heap(bool oome);

 public:

  HeapDumper(bool gc_before_heap_dump) :

    _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(false), _oome(false) { }

  ~HeapDumper();

  // dumps the heap to the specified file, returns 0 if success.

  int dump(const char* path);

  // returns error message (resource allocated), or NULL if no error

  char* error_as_C_string() const;

  static void dump_heap()    KERNEL_RETURN;

  static void dump_heap_from_oome()    KERNEL_RETURN;

};

#endif // SHARE_VM_SERVICES_HEAPDUMPER_HPP