src/hotspot/share/gc/cms/cmsHeap.hpp
author rkennke
Thu, 30 Nov 2017 13:40:07 +0100
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8191564: Refactor GC related servicability code into GC specific subclasses Reviewed-by: ehelin, eosterlund
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/*
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 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_CMS_CMSHEAP_HPP
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#define SHARE_VM_GC_CMS_CMSHEAP_HPP
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#include "gc/cms/concurrentMarkSweepGeneration.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "gc/shared/gcCause.hpp"
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#include "gc/shared/genCollectedHeap.hpp"
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#include "utilities/growableArray.hpp"
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class CLDClosure;
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class GenCollectorPolicy;
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class GCMemoryManager;
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class MemoryPool;
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class OopsInGenClosure;
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class outputStream;
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class StrongRootsScope;
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class ThreadClosure;
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class WorkGang;
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class CMSHeap : public GenCollectedHeap {
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protected:
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  virtual void check_gen_kinds();
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public:
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  CMSHeap(GenCollectorPolicy *policy);
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  // Returns JNI_OK on success
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  virtual jint initialize();
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  // Convenience function to be used in situations where the heap type can be
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  // asserted to be this type.
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  static CMSHeap* heap();
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  virtual Name kind() const {
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    return CollectedHeap::CMSHeap;
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  }
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  virtual const char* name() const {
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    return "Concurrent Mark Sweep";
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  }
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  WorkGang* workers() const { return _workers; }
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  virtual void print_gc_threads_on(outputStream* st) const;
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  virtual void gc_threads_do(ThreadClosure* tc) const;
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  virtual void print_on_error(outputStream* st) const;
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  // Perform a full collection of the heap; intended for use in implementing
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  // "System.gc". This implies as full a collection as the CollectedHeap
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  // supports. Caller does not hold the Heap_lock on entry.
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  void collect(GCCause::Cause cause);
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  bool card_mark_must_follow_store() const {
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    return true;
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  }
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  void stop();
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  void safepoint_synchronize_begin();
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  void safepoint_synchronize_end();
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  virtual GrowableArray<GCMemoryManager*> memory_managers();
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  virtual GrowableArray<MemoryPool*> memory_pools();
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  // If "young_gen_as_roots" is false, younger generations are
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  // not scanned as roots; in this case, the caller must be arranging to
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  // scan the younger generations itself.  (For example, a generation might
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  // explicitly mark reachable objects in younger generations, to avoid
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  // excess storage retention.)
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  void cms_process_roots(StrongRootsScope* scope,
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                         bool young_gen_as_roots,
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                         ScanningOption so,
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                         bool only_strong_roots,
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                         OopsInGenClosure* root_closure,
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                         CLDClosure* cld_closure);
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  GCMemoryManager* old_manager() const { return _old_manager; }
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private:
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  WorkGang* _workers;
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  MemoryPool* _eden_pool;
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  MemoryPool* _survivor_pool;
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  MemoryPool* _old_pool;
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  virtual void gc_prologue(bool full);
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  virtual void gc_epilogue(bool full);
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  virtual void initialize_serviceability();
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  // Accessor for memory state verification support
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  NOT_PRODUCT(
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    virtual size_t skip_header_HeapWords() { return CMSCollector::skip_header_HeapWords(); }
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  )
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  // Returns success or failure.
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  bool create_cms_collector();
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  // In support of ExplicitGCInvokesConcurrent functionality
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  bool should_do_concurrent_full_gc(GCCause::Cause cause);
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  void collect_mostly_concurrent(GCCause::Cause cause);
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};
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#endif // SHARE_VM_GC_CMS_CMSHEAP_HPP