/*

 * Copyright (c) 2017, 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

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 */

#ifndef SHARE_VM_GC_CMS_CMSHEAP_HPP

#define SHARE_VM_GC_CMS_CMSHEAP_HPP

#include "gc/cms/concurrentMarkSweepGeneration.hpp"

#include "gc/shared/collectedHeap.hpp"

#include "gc/shared/gcCause.hpp"

#include "gc/shared/genCollectedHeap.hpp"

class CLDClosure;

class GenCollectorPolicy;

class OopsInGenClosure;

class outputStream;

class StrongRootsScope;

class ThreadClosure;

class WorkGang;

class CMSHeap : public GenCollectedHeap {

protected:

  virtual void check_gen_kinds();

public:

  CMSHeap(GenCollectorPolicy *policy);

  // Returns JNI_OK on success

  virtual jint initialize();

  // Convenience function to be used in situations where the heap type can be

  // asserted to be this type.

  static CMSHeap* heap();

  virtual Name kind() const {

    return CollectedHeap::CMSHeap;

  }

  virtual const char* name() const {

    return "Concurrent Mark Sweep";

  }

  WorkGang* workers() const { return _workers; }

  virtual void print_gc_threads_on(outputStream* st) const;

  virtual void gc_threads_do(ThreadClosure* tc) const;

  virtual void print_on_error(outputStream* st) const;

  // Perform a full collection of the heap; intended for use in implementing

  // "System.gc". This implies as full a collection as the CollectedHeap

  // supports. Caller does not hold the Heap_lock on entry.

  void collect(GCCause::Cause cause);

  bool card_mark_must_follow_store() const {

    return true;

  }

  void stop();

  void safepoint_synchronize_begin();

  void safepoint_synchronize_end();

  // If "young_gen_as_roots" is false, younger generations are

  // not scanned as roots; in this case, the caller must be arranging to

  // scan the younger generations itself.  (For example, a generation might

  // explicitly mark reachable objects in younger generations, to avoid

  // excess storage retention.)

  void cms_process_roots(StrongRootsScope* scope,

                         bool young_gen_as_roots,

                         ScanningOption so,

                         bool only_strong_roots,

                         OopsInGenClosure* root_closure,

                         CLDClosure* cld_closure);

private:

  WorkGang* _workers;

  virtual void gc_prologue(bool full);

  virtual void gc_epilogue(bool full);

  // Accessor for memory state verification support

  NOT_PRODUCT(

    virtual size_t skip_header_HeapWords() { return CMSCollector::skip_header_HeapWords(); }

  )

  // Returns success or failure.

  bool create_cms_collector();

  // In support of ExplicitGCInvokesConcurrent functionality

  bool should_do_concurrent_full_gc(GCCause::Cause cause);

  void collect_mostly_concurrent(GCCause::Cause cause);

};

#endif // SHARE_VM_GC_CMS_CMSHEAP_HPP