| /* |
| * Copyright (c) 2005, 2016, 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_CMS_VMCMSOPERATIONS_HPP |
| #define SHARE_VM_GC_CMS_VMCMSOPERATIONS_HPP |
| |
| #include "gc/cms/concurrentMarkSweepGeneration.hpp" |
| #include "gc/shared/gcCause.hpp" |
| #include "gc/shared/gcId.hpp" |
| #include "gc/shared/referencePendingListLocker.hpp" |
| #include "gc/shared/vmGCOperations.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 { |
| private: |
| ReferencePendingListLocker _pending_list_locker; |
| |
| protected: |
| CMSCollector* _collector; // associated collector |
| bool _prologue_succeeded; // whether doit_prologue succeeded |
| uint _gc_id; |
| |
| 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), |
| _gc_id(GCId::current()) {} |
| ~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_pending_list_lock() 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_pending_list_lock() 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_pending_list_lock() const { |
| return true; |
| } |
| }; |
| |
| |
| // VM operation to invoke a concurrent collection of the heap as a |
| // GenCollectedHeap heap. |
| class VM_GenCollectFullConcurrent: public VM_GC_Operation { |
| public: |
| VM_GenCollectFullConcurrent(uint gc_count_before, |
| uint full_gc_count_before, |
| GCCause::Cause gc_cause) |
| : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */) |
| { |
| assert(FullGCCount_lock != NULL, "Error"); |
| } |
| ~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_CMS_VMCMSOPERATIONS_HPP |