/*

 * Copyright (c) 2001, 2009, 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.

 *

 */

// VM_operations for the G1 collector.

// VM_GC_Operation:

//   - VM_CGC_Operation

//   - VM_G1CollectFull

//   - VM_G1CollectForAllocation

//   - VM_G1IncCollectionPause

//   - VM_G1PopRegionCollectionPause

class VM_G1CollectFull: public VM_GC_Operation {

 public:

  VM_G1CollectFull(unsigned int gc_count_before,

                   unsigned int full_gc_count_before,

                   GCCause::Cause cause)

    : VM_GC_Operation(gc_count_before, full_gc_count_before) {

    _gc_cause = cause;

  }

  ~VM_G1CollectFull() {}

  virtual VMOp_Type type() const { return VMOp_G1CollectFull; }

  virtual void doit();

  virtual const char* name() const {

    return "full garbage-first collection";

  }

};

class VM_G1CollectForAllocation: public VM_GC_Operation {

 private:

  HeapWord*   _res;

  size_t      _size;                       // size of object to be allocated

 public:

  VM_G1CollectForAllocation(size_t size, int gc_count_before)

    : VM_GC_Operation(gc_count_before) {

    _size        = size;

    _res         = NULL;

  }

  ~VM_G1CollectForAllocation()        {}

  virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }

  virtual void doit();

  virtual const char* name() const {

    return "garbage-first collection to satisfy allocation";

  }

  HeapWord* result() { return _res; }

};

class VM_G1IncCollectionPause: public VM_GC_Operation {

private:

  bool _should_initiate_conc_mark;

  double _target_pause_time_ms;

  unsigned int _full_collections_completed_before;

public:

  VM_G1IncCollectionPause(unsigned int   gc_count_before,

                          bool           should_initiate_conc_mark,

                          double         target_pause_time_ms,

                          GCCause::Cause cause)

    : VM_GC_Operation(gc_count_before),

      _full_collections_completed_before(0),

      _should_initiate_conc_mark(should_initiate_conc_mark),

      _target_pause_time_ms(target_pause_time_ms) {

    guarantee(target_pause_time_ms > 0.0,

              err_msg("target_pause_time_ms = %1.6lf should be positive",

                      target_pause_time_ms));

    _gc_cause = cause;

  }

  virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }

  virtual void doit();

  virtual void doit_epilogue();

  virtual const char* name() const {

    return "garbage-first incremental collection pause";

  }

};

// Concurrent GC stop-the-world operations such as initial and final mark;

// consider sharing these with CMS's counterparts.

class VM_CGC_Operation: public VM_Operation {

  VoidClosure* _cl;

  const char* _printGCMessage;

 public:

  VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg) :

    _cl(cl),

    _printGCMessage(printGCMsg)

    {}

  ~VM_CGC_Operation() {}

  virtual VMOp_Type type() const { return VMOp_CGC_Operation; }

  virtual void doit();

  virtual bool doit_prologue();

  virtual void doit_epilogue();

  virtual const char* name() const {

    return "concurrent gc";

  }

};