author | sjohanss |
Wed, 02 Sep 2015 09:14:04 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 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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||
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#ifndef SHARE_VM_GC_CMS_CMSOOPCLOSURES_HPP |
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#define SHARE_VM_GC_CMS_CMSOOPCLOSURES_HPP |
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#include "gc/shared/genOopClosures.hpp" |
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#include "gc/shared/taskqueue.hpp" |
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#include "memory/iterator.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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// TODO: This duplication of the MetadataAwareOopClosure class is only needed |
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// because some CMS OopClosures derive from OopsInGenClosure. It would be |
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// good to get rid of them completely. |
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class MetadataAwareOopsInGenClosure: public OopsInGenClosure { |
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KlassToOopClosure _klass_closure; |
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public: |
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MetadataAwareOopsInGenClosure() { |
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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_cld(ClassLoaderData* cld) { do_cld_nv(cld); } |
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void do_cld_nv(ClassLoaderData* cld); |
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}; |
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class MarkRefsIntoClosure: public MetadataAwareOopsInGenClosure { |
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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 MetadataAwareOopsInGenClosure { |
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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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public: |
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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 MetadataAwareOopsInGenClosure { |
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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 MetadataAwareOopClosure { |
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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 |
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// reference processor are currently all shared. Access to |
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// 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 MetadataAwareOopClosure { |
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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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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); } |
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}; |
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// The non-parallel version (the parallel version appears further below). |
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class MarkRefsIntoAndScanClosure: public MetadataAwareOopsInGenClosure { |
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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 | 178 |
public: |
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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, |
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CMSCollector* collector, |
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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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|
1 | 192 |
void set_freelistLock(Mutex* m) { |
193 |
_freelistLock = m; |
|
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} |
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private: |
|
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inline void do_yield_check(); |
|
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void do_yield_work(); |
|
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bool take_from_overflow_list(); |
|
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}; |
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// In this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit |
1 | 203 |
// stack and the bitMap are shared, so access needs to be suitably |
22551 | 204 |
// synchronized. An OopTaskQueue structure, supporting efficient |
205 |
// work stealing, replaces a CMSMarkStack for storing grey objects. |
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class Par_MarkRefsIntoAndScanClosure: public MetadataAwareOopsInGenClosure { |
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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 |
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public: |
216 |
Par_MarkRefsIntoAndScanClosure(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_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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|
1 | 226 |
void trim_queue(uint size); |
227 |
}; |
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228 |
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229 |
// This closure is used during the concurrent marking phase |
|
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// following the first checkpoint. Its use is buried in |
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// the closure MarkFromRootsClosure. |
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class PushOrMarkClosure: public MetadataAwareOopClosure { |
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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 | 243 |
public: |
244 |
PushOrMarkClosure(CMSCollector* cms_collector, |
|
245 |
MemRegion span, |
|
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CMSBitMap* bitMap, |
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CMSMarkStack* markStack, |
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HeapWord* finger, |
1 | 249 |
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 | 254 |
|
1 | 255 |
// Deal with a stack overflow condition |
256 |
void handle_stack_overflow(HeapWord* lost); |
|
257 |
private: |
|
258 |
inline void do_yield_check(); |
|
259 |
}; |
|
260 |
||
261 |
// A parallel (MT) version of the above. |
|
262 |
// This closure is used during the concurrent marking phase |
|
263 |
// following the first checkpoint. Its use is buried in |
|
264 |
// the closure Par_MarkFromRootsClosure. |
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class Par_PushOrMarkClosure: public MetadataAwareOopClosure { |
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CMSCollector* _collector; |
1 | 268 |
MemRegion _whole_span; |
269 |
MemRegion _span; // local chunk |
|
270 |
CMSBitMap* _bit_map; |
|
271 |
OopTaskQueue* _work_queue; |
|
272 |
CMSMarkStack* _overflow_stack; |
|
273 |
HeapWord* const _finger; |
|
274 |
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 | 279 |
public: |
280 |
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 | 292 |
|
1 | 293 |
// Deal with a stack overflow condition |
294 |
void handle_stack_overflow(HeapWord* lost); |
|
295 |
private: |
|
296 |
inline void do_yield_check(); |
|
297 |
}; |
|
298 |
||
299 |
// For objects in CMS generation, this closure marks |
|
300 |
// given objects (transitively) as being reachable/live. |
|
301 |
// 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 MetadataAwareOopClosure { |
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CMSCollector* _collector; |
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const MemRegion _span; |
1 | 309 |
CMSMarkStack* _mark_stack; |
310 |
CMSBitMap* _bit_map; |
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bool _concurrent_precleaning; |
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protected: |
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DO_OOP_WORK_DEFN |
1 | 314 |
public: |
315 |
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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321 |
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); } |
1 | 323 |
}; |
324 |
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class CMSInnerParMarkAndPushClosure: public MetadataAwareOopClosure { |
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CMSCollector* _collector; |
1 | 328 |
MemRegion _span; |
329 |
OopTaskQueue* _work_queue; |
|
330 |
CMSBitMap* _bit_map; |
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332 |
DO_OOP_WORK_DEFN |
1 | 333 |
public: |
334 |
CMSInnerParMarkAndPushClosure(CMSCollector* collector, |
|
335 |
MemRegion span, CMSBitMap* bit_map, |
|
3690 | 336 |
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); } |
1 | 341 |
}; |
342 |
||
343 |
// A parallel (MT) version of the above, used when |
|
344 |
// reference processing is parallel; the only difference |
|
345 |
// is in the do_oop method. |
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class CMSParKeepAliveClosure: public MetadataAwareOopClosure { |
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private: |
1 | 348 |
MemRegion _span; |
349 |
OopTaskQueue* _work_queue; |
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350 |
CMSBitMap* _bit_map; |
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351 |
CMSInnerParMarkAndPushClosure |
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_mark_and_push; |
1 | 353 |
const uint _low_water_mark; |
354 |
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_CMS_CMSOOPCLOSURES_HPP |