author | david |
Thu, 22 Oct 2015 08:53:13 +0200 | |
changeset 33587 | c04a7462b0e6 |
parent 33107 | 77bf0d2069a3 |
child 37129 | af29e306e50b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005, 2015, 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_VMCMSOPERATIONS_HPP |
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#define SHARE_VM_GC_CMS_VMCMSOPERATIONS_HPP |
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#include "gc/cms/concurrentMarkSweepGeneration.hpp" |
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#include "gc/shared/gcCause.hpp" |
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#include "gc/shared/gcId.hpp" |
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#include "gc/shared/vmGCOperations.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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uint _gc_id; |
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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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_gc_id(GCId::current()) {} |
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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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public: |
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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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public: |
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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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public: |
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VM_GenCollectFullConcurrent(uint gc_count_before, |
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uint full_gc_count_before, |
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GCCause::Cause gc_cause) |
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: VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */) |
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{ |
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assert(FullGCCount_lock != NULL, "Error"); |
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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_CMS_VMCMSOPERATIONS_HPP |