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/*
* Copyright (c) 2005, 2011, 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_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
#define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp"
#include "gc_implementation/shared/vmGCOperations.hpp"
#include "gc_interface/gcCause.hpp"
#include "runtime/vm_operations.hpp"
// The VM_CMS_Operation is slightly different from
// a VM_GC_Operation -- and would not have subclassed easily
// to VM_GC_Operation without several changes to VM_GC_Operation.
// To minimize the changes, we have replicated some of the VM_GC_Operation
// functionality here. We will consolidate that back by doing subclassing
// as appropriate in Dolphin.
//
// VM_Operation
// VM_CMS_Operation
// - implements the common portion of work done in support
// of CMS' stop-world phases (initial mark and remark).
//
// VM_CMS_Initial_Mark
// VM_CMS_Final_Mark
//
// Forward decl.
class CMSCollector;
class VM_CMS_Operation: public VM_Operation {
protected:
CMSCollector* _collector; // associated collector
bool _prologue_succeeded; // whether doit_prologue succeeded
bool lost_race() const;
// java.lang.ref.Reference support
void acquire_pending_list_lock();
void release_and_notify_pending_list_lock();
public:
VM_CMS_Operation(CMSCollector* collector):
_collector(collector),
_prologue_succeeded(false) {}
~VM_CMS_Operation() {}
// The legal collector state for executing this CMS op.
virtual const CMSCollector::CollectorState legal_state() const = 0;
// Whether the pending list lock needs to be held
virtual const bool needs_pll() const = 0;
// Execute operations in the context of the caller,
// prior to execution of the vm operation itself.
virtual bool doit_prologue();
// Execute operations in the context of the caller,
// following completion of the vm operation.
virtual void doit_epilogue();
virtual bool evaluate_at_safepoint() const { return true; }
virtual bool is_cheap_allocated() const { return false; }
virtual bool allow_nested_vm_operations() const { return false; }
bool prologue_succeeded() const { return _prologue_succeeded; }
void verify_before_gc();
void verify_after_gc();
};
// VM_CMS_Operation for the initial marking phase of CMS.
class VM_CMS_Initial_Mark: public VM_CMS_Operation {
public:
VM_CMS_Initial_Mark(CMSCollector* _collector) :
VM_CMS_Operation(_collector) {}
virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
virtual void doit();
virtual const CMSCollector::CollectorState legal_state() const {
return CMSCollector::InitialMarking;
}
virtual const bool needs_pll() const {
return false;
}
};
// VM_CMS_Operation for the final remark phase of CMS.
class VM_CMS_Final_Remark: public VM_CMS_Operation {
public:
VM_CMS_Final_Remark(CMSCollector* _collector) :
VM_CMS_Operation(_collector) {}
virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
virtual void doit();
virtual const CMSCollector::CollectorState legal_state() const {
return CMSCollector::FinalMarking;
}
virtual const bool needs_pll() const {
return true;
}
};
// VM operation to invoke a concurrent collection of the heap as a
// GenCollectedHeap heap.
class VM_GenCollectFullConcurrent: public VM_GC_Operation {
bool _disabled_icms;
public:
VM_GenCollectFullConcurrent(unsigned int gc_count_before,
unsigned int full_gc_count_before,
GCCause::Cause gc_cause)
: VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
_disabled_icms(false)
{
assert(FullGCCount_lock != NULL, "Error");
assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
}
~VM_GenCollectFullConcurrent() {}
virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
virtual void doit();
virtual void doit_epilogue();
virtual bool is_cheap_allocated() const { return false; }
virtual bool evaluate_at_safepoint() const;
};
#endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_VMCMSOPERATIONS_HPP
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