author | zgu |
Thu, 01 May 2014 05:52:28 -0700 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2013, 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_CMSOOPCLOSURES_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |
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#include "memory/genOopClosures.hpp" |
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///////////////////////////////////////////////////////////////// |
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// Closures used by ConcurrentMarkSweepGeneration's collector |
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///////////////////////////////////////////////////////////////// |
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class ConcurrentMarkSweepGeneration; |
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class CMSBitMap; |
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class CMSMarkStack; |
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class CMSCollector; |
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class MarkFromRootsClosure; |
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class Par_MarkFromRootsClosure; |
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// Decode the oop and call do_oop on it. |
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#define DO_OOP_WORK_DEFN \ |
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void do_oop(oop obj); \ |
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template <class T> inline void do_oop_work(T* p) { \ |
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T heap_oop = oopDesc::load_heap_oop(p); \ |
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if (!oopDesc::is_null(heap_oop)) { \ |
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oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); \ |
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do_oop(obj); \ |
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} \ |
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} |
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// Applies the given oop closure to all oops in all klasses visited. |
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class CMKlassClosure : public KlassClosure { |
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friend class CMSOopClosure; |
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friend class CMSOopsInGenClosure; |
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OopClosure* _oop_closure; |
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// Used when _oop_closure couldn't be set in an initialization list. |
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void initialize(OopClosure* oop_closure) { |
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assert(_oop_closure == NULL, "Should only be called once"); |
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_oop_closure = oop_closure; |
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} |
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public: |
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CMKlassClosure(OopClosure* oop_closure = NULL) : _oop_closure(oop_closure) { } |
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void do_klass(Klass* k); |
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}; |
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// The base class for all CMS marking closures. |
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// It's used to proxy through the metadata to the oops defined in them. |
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class CMSOopClosure: public ExtendedOopClosure { |
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CMKlassClosure _klass_closure; |
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public: |
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CMSOopClosure() : ExtendedOopClosure() { |
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_klass_closure.initialize(this); |
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} |
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CMSOopClosure(ReferenceProcessor* rp) : ExtendedOopClosure(rp) { |
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_klass_closure.initialize(this); |
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} |
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virtual bool do_metadata() { return do_metadata_nv(); } |
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inline bool do_metadata_nv() { return true; } |
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virtual void do_klass(Klass* k); |
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void do_klass_nv(Klass* k); |
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virtual void do_class_loader_data(ClassLoaderData* cld); |
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}; |
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// TODO: This duplication of the CMSOopClosure class is only needed because |
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// some CMS OopClosures derive from OopsInGenClosure. It would be good |
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// to get rid of them completely. |
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class CMSOopsInGenClosure: public OopsInGenClosure { |
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CMKlassClosure _klass_closure; |
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public: |
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CMSOopsInGenClosure() { |
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_klass_closure.initialize(this); |
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} |
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virtual bool do_metadata() { return do_metadata_nv(); } |
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inline bool do_metadata_nv() { return true; } |
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virtual void do_klass(Klass* k); |
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void do_klass_nv(Klass* k); |
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virtual void do_class_loader_data(ClassLoaderData* cld); |
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}; |
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class MarkRefsIntoClosure: public CMSOopsInGenClosure { |
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private: |
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const MemRegion _span; |
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CMSBitMap* _bitMap; |
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protected: |
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DO_OOP_WORK_DEFN |
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MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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}; |
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class Par_MarkRefsIntoClosure: public CMSOopsInGenClosure { |
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const MemRegion _span; |
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CMSBitMap* _bitMap; |
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protected: |
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DO_OOP_WORK_DEFN |
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Par_MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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}; |
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// A variant of the above used in certain kinds of CMS |
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// marking verification. |
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class MarkRefsIntoVerifyClosure: public CMSOopsInGenClosure { |
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private: |
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const MemRegion _span; |
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CMSBitMap* _verification_bm; |
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CMSBitMap* _cms_bm; |
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protected: |
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DO_OOP_WORK_DEFN |
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MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm, |
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CMSBitMap* cms_bm); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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}; |
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// The non-parallel version (the parallel version appears further below). |
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class PushAndMarkClosure: public CMSOopClosure { |
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private: |
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CMSCollector* _collector; |
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MemRegion _span; |
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CMSBitMap* _bit_map; |
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CMSBitMap* _mod_union_table; |
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CMSMarkStack* _mark_stack; |
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bool _concurrent_precleaning; |
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protected: |
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DO_OOP_WORK_DEFN |
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PushAndMarkClosure(CMSCollector* collector, |
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MemRegion span, |
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ReferenceProcessor* rp, |
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CMSBitMap* bit_map, |
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CMSBitMap* mod_union_table, |
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CMSMarkStack* mark_stack, |
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bool concurrent_precleaning); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { PushAndMarkClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); } |
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}; |
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// In the parallel case, the bit map and the |
1 | 175 |
// reference processor are currently all shared. Access to |
176 |
// these shared mutable structures must use appropriate |
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// synchronization (for instance, via CAS). The marking stack |
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// used in the non-parallel case above is here replaced with |
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// an OopTaskQueue structure to allow efficient work stealing. |
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class Par_PushAndMarkClosure: public CMSOopClosure { |
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private: |
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CMSCollector* _collector; |
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MemRegion _span; |
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CMSBitMap* _bit_map; |
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OopTaskQueue* _work_queue; |
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protected: |
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DO_OOP_WORK_DEFN |
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public: |
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Par_PushAndMarkClosure(CMSCollector* collector, |
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MemRegion span, |
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ReferenceProcessor* rp, |
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CMSBitMap* bit_map, |
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OopTaskQueue* work_queue); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
1 | 198 |
}; |
199 |
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// The non-parallel version (the parallel version appears further below). |
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class MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure { |
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private: |
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MemRegion _span; |
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CMSBitMap* _bit_map; |
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CMSMarkStack* _mark_stack; |
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PushAndMarkClosure _pushAndMarkClosure; |
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CMSCollector* _collector; |
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Mutex* _freelistLock; |
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bool _yield; |
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// Whether closure is being used for concurrent precleaning |
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bool _concurrent_precleaning; |
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protected: |
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DO_OOP_WORK_DEFN |
1 | 214 |
public: |
215 |
MarkRefsIntoAndScanClosure(MemRegion span, |
|
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ReferenceProcessor* rp, |
|
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CMSBitMap* bit_map, |
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CMSBitMap* mod_union_table, |
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CMSMarkStack* mark_stack, |
1 | 220 |
CMSCollector* collector, |
221 |
bool should_yield, |
|
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bool concurrent_precleaning); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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|
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void set_freelistLock(Mutex* m) { |
229 |
_freelistLock = m; |
|
230 |
} |
|
231 |
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232 |
private: |
|
233 |
inline void do_yield_check(); |
|
234 |
void do_yield_work(); |
|
235 |
bool take_from_overflow_list(); |
|
236 |
}; |
|
237 |
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22551 | 238 |
// In this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit |
1 | 239 |
// stack and the bitMap are shared, so access needs to be suitably |
22551 | 240 |
// synchronized. An OopTaskQueue structure, supporting efficient |
241 |
// work stealing, replaces a CMSMarkStack for storing grey objects. |
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class Par_MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure { |
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private: |
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MemRegion _span; |
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CMSBitMap* _bit_map; |
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OopTaskQueue* _work_queue; |
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const uint _low_water_mark; |
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Par_PushAndMarkClosure _par_pushAndMarkClosure; |
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protected: |
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DO_OOP_WORK_DEFN |
1 | 251 |
public: |
252 |
Par_MarkRefsIntoAndScanClosure(CMSCollector* collector, |
|
253 |
MemRegion span, |
|
254 |
ReferenceProcessor* rp, |
|
255 |
CMSBitMap* bit_map, |
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OopTaskQueue* work_queue); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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261 |
|
1 | 262 |
void trim_queue(uint size); |
263 |
}; |
|
264 |
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265 |
// This closure is used during the concurrent marking phase |
|
266 |
// following the first checkpoint. Its use is buried in |
|
267 |
// the closure MarkFromRootsClosure. |
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class PushOrMarkClosure: public CMSOopClosure { |
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CMSCollector* _collector; |
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MemRegion _span; |
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CMSBitMap* _bitMap; |
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CMSMarkStack* _markStack; |
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HeapWord* const _finger; |
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MarkFromRootsClosure* const |
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_parent; |
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protected: |
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DO_OOP_WORK_DEFN |
1 | 279 |
public: |
280 |
PushOrMarkClosure(CMSCollector* cms_collector, |
|
281 |
MemRegion span, |
|
282 |
CMSBitMap* bitMap, |
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CMSMarkStack* markStack, |
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HeapWord* finger, |
1 | 285 |
MarkFromRootsClosure* parent); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { PushOrMarkClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); } |
3696 | 290 |
|
1 | 291 |
// Deal with a stack overflow condition |
292 |
void handle_stack_overflow(HeapWord* lost); |
|
293 |
private: |
|
294 |
inline void do_yield_check(); |
|
295 |
}; |
|
296 |
||
297 |
// A parallel (MT) version of the above. |
|
298 |
// This closure is used during the concurrent marking phase |
|
299 |
// following the first checkpoint. Its use is buried in |
|
300 |
// the closure Par_MarkFromRootsClosure. |
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class Par_PushOrMarkClosure: public CMSOopClosure { |
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CMSCollector* _collector; |
1 | 304 |
MemRegion _whole_span; |
305 |
MemRegion _span; // local chunk |
|
306 |
CMSBitMap* _bit_map; |
|
307 |
OopTaskQueue* _work_queue; |
|
308 |
CMSMarkStack* _overflow_stack; |
|
309 |
HeapWord* const _finger; |
|
310 |
HeapWord** const _global_finger_addr; |
|
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Par_MarkFromRootsClosure* const |
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_parent; |
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protected: |
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DO_OOP_WORK_DEFN |
1 | 315 |
public: |
316 |
Par_PushOrMarkClosure(CMSCollector* cms_collector, |
|
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MemRegion span, |
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CMSBitMap* bit_map, |
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OopTaskQueue* work_queue, |
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CMSMarkStack* mark_stack, |
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HeapWord* finger, |
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HeapWord** global_finger_addr, |
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Par_MarkFromRootsClosure* parent); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
3696 | 328 |
|
1 | 329 |
// Deal with a stack overflow condition |
330 |
void handle_stack_overflow(HeapWord* lost); |
|
331 |
private: |
|
332 |
inline void do_yield_check(); |
|
333 |
}; |
|
334 |
||
335 |
// For objects in CMS generation, this closure marks |
|
336 |
// given objects (transitively) as being reachable/live. |
|
337 |
// This is currently used during the (weak) reference object |
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// processing phase of the CMS final checkpoint step, as |
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// well as during the concurrent precleaning of the discovered |
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// reference lists. |
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class CMSKeepAliveClosure: public CMSOopClosure { |
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private: |
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CMSCollector* _collector; |
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const MemRegion _span; |
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CMSMarkStack* _mark_stack; |
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CMSBitMap* _bit_map; |
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bool _concurrent_precleaning; |
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protected: |
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DO_OOP_WORK_DEFN |
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CMSKeepAliveClosure(CMSCollector* collector, MemRegion span, |
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CMSBitMap* bit_map, CMSMarkStack* mark_stack, |
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bool cpc); |
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bool concurrent_precleaning() const { return _concurrent_precleaning; } |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
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}; |
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class CMSInnerParMarkAndPushClosure: public CMSOopClosure { |
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private: |
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CMSCollector* _collector; |
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MemRegion _span; |
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OopTaskQueue* _work_queue; |
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CMSBitMap* _bit_map; |
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DO_OOP_WORK_DEFN |
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CMSInnerParMarkAndPushClosure(CMSCollector* collector, |
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MemRegion span, CMSBitMap* bit_map, |
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OopTaskQueue* work_queue); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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inline void do_oop_nv(oop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
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inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
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}; |
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// A parallel (MT) version of the above, used when |
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// reference processing is parallel; the only difference |
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// is in the do_oop method. |
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class CMSParKeepAliveClosure: public CMSOopClosure { |
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private: |
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MemRegion _span; |
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OopTaskQueue* _work_queue; |
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CMSBitMap* _bit_map; |
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CMSInnerParMarkAndPushClosure |
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_mark_and_push; |
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const uint _low_water_mark; |
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void trim_queue(uint max); |
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protected: |
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DO_OOP_WORK_DEFN |
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public: |
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CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span, |
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CMSBitMap* bit_map, OopTaskQueue* work_queue); |
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virtual void do_oop(oop* p); |
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virtual void do_oop(narrowOop* p); |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |