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view src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp @ 14189:1a899ea6b7ed
8031305: (hotspot) com.sun.management.VMOption is missing the ATTACH_ON_DEMAND origin
Reviewed-by: jbachorik, mchung, dholmes
author | sla |
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date | Tue, 07 Jan 2014 12:32:57 +0100 |
parents | ca9dedeebdec |
children | de6a9e811145 |
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/* * Copyright (c) 2007, 2012, 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_CMSOOPCLOSURES_HPP #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP #include "memory/genOopClosures.hpp" ///////////////////////////////////////////////////////////////// // Closures used by ConcurrentMarkSweepGeneration's collector ///////////////////////////////////////////////////////////////// class ConcurrentMarkSweepGeneration; class CMSBitMap; class CMSMarkStack; class CMSCollector; class MarkFromRootsClosure; class Par_MarkFromRootsClosure; // Decode the oop and call do_oop on it. #define DO_OOP_WORK_DEFN \ void do_oop(oop obj); \ template <class T> inline void do_oop_work(T* p) { \ T heap_oop = oopDesc::load_heap_oop(p); \ if (!oopDesc::is_null(heap_oop)) { \ oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); \ do_oop(obj); \ } \ } // Applies the given oop closure to all oops in all klasses visited. class CMKlassClosure : public KlassClosure { friend class CMSOopClosure; friend class CMSOopsInGenClosure; OopClosure* _oop_closure; // Used when _oop_closure couldn't be set in an initialization list. void initialize(OopClosure* oop_closure) { assert(_oop_closure == NULL, "Should only be called once"); _oop_closure = oop_closure; } public: CMKlassClosure(OopClosure* oop_closure = NULL) : _oop_closure(oop_closure) { } void do_klass(Klass* k); }; // The base class for all CMS marking closures. // It's used to proxy through the metadata to the oops defined in them. class CMSOopClosure: public ExtendedOopClosure { CMKlassClosure _klass_closure; public: CMSOopClosure() : ExtendedOopClosure() { _klass_closure.initialize(this); } CMSOopClosure(ReferenceProcessor* rp) : ExtendedOopClosure(rp) { _klass_closure.initialize(this); } virtual bool do_metadata() { return do_metadata_nv(); } inline bool do_metadata_nv() { return true; } virtual void do_klass(Klass* k); void do_klass_nv(Klass* k); virtual void do_class_loader_data(ClassLoaderData* cld); }; // TODO: This duplication of the CMSOopClosure class is only needed because // some CMS OopClosures derive from OopsInGenClosure. It would be good // to get rid of them completely. class CMSOopsInGenClosure: public OopsInGenClosure { CMKlassClosure _klass_closure; public: CMSOopsInGenClosure() { _klass_closure.initialize(this); } virtual bool do_metadata() { return do_metadata_nv(); } inline bool do_metadata_nv() { return true; } virtual void do_klass(Klass* k); void do_klass_nv(Klass* k); virtual void do_class_loader_data(ClassLoaderData* cld); }; class MarkRefsIntoClosure: public CMSOopsInGenClosure { private: const MemRegion _span; CMSBitMap* _bitMap; protected: DO_OOP_WORK_DEFN public: MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); Prefetch::style prefetch_style() { return Prefetch::do_read; } }; class Par_MarkRefsIntoClosure: public CMSOopsInGenClosure { private: const MemRegion _span; CMSBitMap* _bitMap; protected: DO_OOP_WORK_DEFN public: Par_MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); Prefetch::style prefetch_style() { return Prefetch::do_read; } }; // A variant of the above used in certain kinds of CMS // marking verification. class MarkRefsIntoVerifyClosure: public CMSOopsInGenClosure { private: const MemRegion _span; CMSBitMap* _verification_bm; CMSBitMap* _cms_bm; protected: DO_OOP_WORK_DEFN public: MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm, CMSBitMap* cms_bm); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); Prefetch::style prefetch_style() { return Prefetch::do_read; } }; // The non-parallel version (the parallel version appears further below). class PushAndMarkClosure: public CMSOopClosure { private: CMSCollector* _collector; MemRegion _span; CMSBitMap* _bit_map; CMSBitMap* _mod_union_table; CMSMarkStack* _mark_stack; bool _concurrent_precleaning; protected: DO_OOP_WORK_DEFN public: PushAndMarkClosure(CMSCollector* collector, MemRegion span, ReferenceProcessor* rp, CMSBitMap* bit_map, CMSBitMap* mod_union_table, CMSMarkStack* mark_stack, bool concurrent_precleaning); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { PushAndMarkClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); } Prefetch::style prefetch_style() { return Prefetch::do_read; } }; // In the parallel case, the bit map and the // reference processor are currently all shared. Access to // these shared mutable structures must use appropriate // synchronization (for instance, via CAS). The marking stack // used in the non-parallel case above is here replaced with // an OopTaskQueue structure to allow efficient work stealing. class Par_PushAndMarkClosure: public CMSOopClosure { private: CMSCollector* _collector; MemRegion _span; CMSBitMap* _bit_map; OopTaskQueue* _work_queue; protected: DO_OOP_WORK_DEFN public: Par_PushAndMarkClosure(CMSCollector* collector, MemRegion span, ReferenceProcessor* rp, CMSBitMap* bit_map, OopTaskQueue* work_queue); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { Par_PushAndMarkClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); } Prefetch::style prefetch_style() { return Prefetch::do_read; } }; // The non-parallel version (the parallel version appears further below). class MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure { private: MemRegion _span; CMSBitMap* _bit_map; CMSMarkStack* _mark_stack; PushAndMarkClosure _pushAndMarkClosure; CMSCollector* _collector; Mutex* _freelistLock; bool _yield; // Whether closure is being used for concurrent precleaning bool _concurrent_precleaning; protected: DO_OOP_WORK_DEFN public: MarkRefsIntoAndScanClosure(MemRegion span, ReferenceProcessor* rp, CMSBitMap* bit_map, CMSBitMap* mod_union_table, CMSMarkStack* mark_stack, CMSCollector* collector, bool should_yield, bool concurrent_precleaning); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } Prefetch::style prefetch_style() { return Prefetch::do_read; } void set_freelistLock(Mutex* m) { _freelistLock = m; } private: inline void do_yield_check(); void do_yield_work(); bool take_from_overflow_list(); }; // Tn this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit // stack and the bitMap are shared, so access needs to be suitably // sycnhronized. An OopTaskQueue structure, supporting efficient // workstealing, replaces a CMSMarkStack for storing grey objects. class Par_MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure { private: MemRegion _span; CMSBitMap* _bit_map; OopTaskQueue* _work_queue; const uint _low_water_mark; Par_PushAndMarkClosure _par_pushAndMarkClosure; protected: DO_OOP_WORK_DEFN public: Par_MarkRefsIntoAndScanClosure(CMSCollector* collector, MemRegion span, ReferenceProcessor* rp, CMSBitMap* bit_map, OopTaskQueue* work_queue); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } Prefetch::style prefetch_style() { return Prefetch::do_read; } void trim_queue(uint size); }; // This closure is used during the concurrent marking phase // following the first checkpoint. Its use is buried in // the closure MarkFromRootsClosure. class PushOrMarkClosure: public CMSOopClosure { private: CMSCollector* _collector; MemRegion _span; CMSBitMap* _bitMap; CMSMarkStack* _markStack; HeapWord* const _finger; MarkFromRootsClosure* const _parent; protected: DO_OOP_WORK_DEFN public: PushOrMarkClosure(CMSCollector* cms_collector, MemRegion span, CMSBitMap* bitMap, CMSMarkStack* markStack, HeapWord* finger, MarkFromRootsClosure* parent); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { PushOrMarkClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); } // Deal with a stack overflow condition void handle_stack_overflow(HeapWord* lost); private: inline void do_yield_check(); }; // A parallel (MT) version of the above. // This closure is used during the concurrent marking phase // following the first checkpoint. Its use is buried in // the closure Par_MarkFromRootsClosure. class Par_PushOrMarkClosure: public CMSOopClosure { private: CMSCollector* _collector; MemRegion _whole_span; MemRegion _span; // local chunk CMSBitMap* _bit_map; OopTaskQueue* _work_queue; CMSMarkStack* _overflow_stack; HeapWord* const _finger; HeapWord** const _global_finger_addr; Par_MarkFromRootsClosure* const _parent; protected: DO_OOP_WORK_DEFN public: Par_PushOrMarkClosure(CMSCollector* cms_collector, MemRegion span, CMSBitMap* bit_map, OopTaskQueue* work_queue, CMSMarkStack* mark_stack, HeapWord* finger, HeapWord** global_finger_addr, Par_MarkFromRootsClosure* parent); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { Par_PushOrMarkClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); } // Deal with a stack overflow condition void handle_stack_overflow(HeapWord* lost); private: inline void do_yield_check(); }; // For objects in CMS generation, this closure marks // given objects (transitively) as being reachable/live. // This is currently used during the (weak) reference object // processing phase of the CMS final checkpoint step, as // well as during the concurrent precleaning of the discovered // reference lists. class CMSKeepAliveClosure: public CMSOopClosure { private: CMSCollector* _collector; const MemRegion _span; CMSMarkStack* _mark_stack; CMSBitMap* _bit_map; bool _concurrent_precleaning; protected: DO_OOP_WORK_DEFN public: CMSKeepAliveClosure(CMSCollector* collector, MemRegion span, CMSBitMap* bit_map, CMSMarkStack* mark_stack, bool cpc); bool concurrent_precleaning() const { return _concurrent_precleaning; } virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { CMSKeepAliveClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); } }; class CMSInnerParMarkAndPushClosure: public CMSOopClosure { private: CMSCollector* _collector; MemRegion _span; OopTaskQueue* _work_queue; CMSBitMap* _bit_map; protected: DO_OOP_WORK_DEFN public: CMSInnerParMarkAndPushClosure(CMSCollector* collector, MemRegion span, CMSBitMap* bit_map, OopTaskQueue* work_queue); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } }; // A parallel (MT) version of the above, used when // reference processing is parallel; the only difference // is in the do_oop method. class CMSParKeepAliveClosure: public CMSOopClosure { private: MemRegion _span; OopTaskQueue* _work_queue; CMSBitMap* _bit_map; CMSInnerParMarkAndPushClosure _mark_and_push; const uint _low_water_mark; void trim_queue(uint max); protected: DO_OOP_WORK_DEFN public: CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span, CMSBitMap* bit_map, OopTaskQueue* work_queue); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); }; #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP