hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp
author stefank
Tue, 23 Nov 2010 13:22:55 -0800
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6989984: Use standard include model for Hospot Summary: Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
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/*
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 * Copyright (c) 2005, 2010, 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_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
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#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp"
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#include "gc_implementation/shared/vmGCOperations.hpp"
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#include "gc_interface/gcCause.hpp"
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#include "runtime/vm_operations.hpp"
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// The VM_CMS_Operation is slightly different from
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// a VM_GC_Operation -- and would not have subclassed easily
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// to VM_GC_Operation without several changes to VM_GC_Operation.
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// To minimize the changes, we have replicated some of the VM_GC_Operation
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// functionality here. We will consolidate that back by doing subclassing
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// as appropriate in Dolphin.
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//
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//  VM_Operation
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//    VM_CMS_Operation
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//    - implements the common portion of work done in support
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//      of CMS' stop-world phases (initial mark and remark).
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//
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//      VM_CMS_Initial_Mark
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//      VM_CMS_Final_Mark
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//
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// Forward decl.
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class CMSCollector;
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class VM_CMS_Operation: public VM_Operation {
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 protected:
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  CMSCollector*  _collector;                 // associated collector
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  bool           _prologue_succeeded;     // whether doit_prologue succeeded
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  bool lost_race() const;
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  // java.lang.ref.Reference support
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  void acquire_pending_list_lock();
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  void release_and_notify_pending_list_lock();
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 public:
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  VM_CMS_Operation(CMSCollector* collector):
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    _collector(collector),
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    _prologue_succeeded(false) {}
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  ~VM_CMS_Operation() {}
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  // The legal collector state for executing this CMS op.
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  virtual const CMSCollector::CollectorState legal_state() const = 0;
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  // Whether the pending list lock needs to be held
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  virtual const bool needs_pll() const = 0;
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  // Execute operations in the context of the caller,
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  // prior to execution of the vm operation itself.
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  virtual bool doit_prologue();
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  // Execute operations in the context of the caller,
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  // following completion of the vm operation.
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  virtual void doit_epilogue();
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  virtual bool evaluate_at_safepoint() const { return true; }
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  virtual bool is_cheap_allocated() const { return false; }
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  virtual bool allow_nested_vm_operations() const  { return false; }
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  bool prologue_succeeded() const { return _prologue_succeeded; }
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  void verify_before_gc();
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  void verify_after_gc();
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};
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// VM_CMS_Operation for the initial marking phase of CMS.
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class VM_CMS_Initial_Mark: public VM_CMS_Operation {
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  VM_CMS_Initial_Mark(CMSCollector* _collector) :
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    VM_CMS_Operation(_collector) {}
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  virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
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  virtual void doit();
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  virtual const CMSCollector::CollectorState legal_state() const {
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    return CMSCollector::InitialMarking;
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  }
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  virtual const bool needs_pll() const {
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    return false;
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  }
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};
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// VM_CMS_Operation for the final remark phase of CMS.
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class VM_CMS_Final_Remark: public VM_CMS_Operation {
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  VM_CMS_Final_Remark(CMSCollector* _collector) :
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    VM_CMS_Operation(_collector) {}
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  virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
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  virtual void doit();
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  virtual const CMSCollector::CollectorState legal_state() const {
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    return CMSCollector::FinalMarking;
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  }
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  virtual const bool needs_pll() const {
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    return true;
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  }
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};
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// VM operation to invoke a concurrent collection of the heap as a
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// GenCollectedHeap heap.
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class VM_GenCollectFullConcurrent: public VM_GC_Operation {
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  VM_GenCollectFullConcurrent(unsigned int gc_count_before,
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                              unsigned int full_gc_count_before,
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                              GCCause::Cause gc_cause)
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    : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */) {
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    _gc_cause = gc_cause;
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    assert(FullGCCount_lock != NULL, "Error");
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    assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
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  }
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  ~VM_GenCollectFullConcurrent() {}
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  virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
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  virtual void doit();
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  virtual void doit_epilogue();
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  virtual bool is_cheap_allocated() const { return false; }
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  virtual bool evaluate_at_safepoint() const;
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP