Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/genOopClosures.hpp @ 1520:bb843ebc7c55
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
Summary: GC-locker induced concurrent full gc should be asynchronous; policy now controlled by a separate flag, which defaults to false.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Mon, 03 May 2010 20:19:05 -0700 |
parents | 2a1472c30599 |
children | c18cbe5936b8 |
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/* * Copyright 2001-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ class Generation; class HeapWord; class CardTableRS; class CardTableModRefBS; class DefNewGeneration; template<class E, unsigned int N> class GenericTaskQueue; typedef GenericTaskQueue<oop, TASKQUEUE_SIZE> OopTaskQueue; template<class T> class GenericTaskQueueSet; typedef GenericTaskQueueSet<OopTaskQueue> OopTaskQueueSet; // Closure for iterating roots from a particular generation // Note: all classes deriving from this MUST call this do_barrier // method at the end of their own do_oop method! // Note: no do_oop defined, this is an abstract class. class OopsInGenClosure : public OopClosure { private: Generation* _orig_gen; // generation originally set in ctor Generation* _gen; // generation being scanned protected: // Some subtypes need access. HeapWord* _gen_boundary; // start of generation CardTableRS* _rs; // remembered set // For assertions Generation* generation() { return _gen; } CardTableRS* rs() { return _rs; } // Derived classes that modify oops so that they might be old-to-young // pointers must call the method below. template <class T> void do_barrier(T* p); // Version for use by closures that may be called in parallel code. template <class T> void par_do_barrier(T* p); public: OopsInGenClosure() : OopClosure(NULL), _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; OopsInGenClosure(Generation* gen); void set_generation(Generation* gen); void reset_generation() { _gen = _orig_gen; } // Problem with static closures: must have _gen_boundary set at some point, // but cannot do this until after the heap is initialized. void set_orig_generation(Generation* gen) { _orig_gen = gen; set_generation(gen); } HeapWord* gen_boundary() { return _gen_boundary; } }; // Closure for scanning DefNewGeneration. // // This closure will perform barrier store calls for ALL // pointers in scanned oops. class ScanClosure: public OopsInGenClosure { protected: DefNewGeneration* _g; HeapWord* _boundary; bool _gc_barrier; template <class T> inline void do_oop_work(T* p); public: ScanClosure(DefNewGeneration* g, bool gc_barrier); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p); inline void do_oop_nv(narrowOop* p); bool do_header() { return false; } Prefetch::style prefetch_style() { return Prefetch::do_write; } }; // Closure for scanning DefNewGeneration. // // This closure only performs barrier store calls on // pointers into the DefNewGeneration. This is less // precise, but faster, than a ScanClosure class FastScanClosure: public OopsInGenClosure { protected: DefNewGeneration* _g; HeapWord* _boundary; bool _gc_barrier; template <class T> inline void do_oop_work(T* p); public: FastScanClosure(DefNewGeneration* g, bool gc_barrier); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p); inline void do_oop_nv(narrowOop* p); bool do_header() { return false; } Prefetch::style prefetch_style() { return Prefetch::do_write; } }; class FilteringClosure: public OopClosure { private: HeapWord* _boundary; OopClosure* _cl; protected: 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); if ((HeapWord*)obj < _boundary) { _cl->do_oop(p); } } } public: FilteringClosure(HeapWord* boundary, OopClosure* cl) : OopClosure(cl->_ref_processor), _boundary(boundary), _cl(cl) {} virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } bool do_header() { return false; } }; // Closure for scanning DefNewGeneration's weak references. // NOTE: very much like ScanClosure but not derived from // OopsInGenClosure -- weak references are processed all // at once, with no notion of which generation they were in. class ScanWeakRefClosure: public OopClosure { protected: DefNewGeneration* _g; HeapWord* _boundary; template <class T> inline void do_oop_work(T* p); public: ScanWeakRefClosure(DefNewGeneration* g); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p); inline void do_oop_nv(narrowOop* p); }; class VerifyOopClosure: public OopClosure { protected: template <class T> inline void do_oop_work(T* p) { oop obj = oopDesc::load_decode_heap_oop(p); guarantee(obj->is_oop_or_null(), "invalid oop"); } public: virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); static VerifyOopClosure verify_oop; };