Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp @ 2142:8012aa3ccede
4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed
author | never |
---|---|
date | Thu, 13 Jan 2011 22:15:41 -0800 |
parents | f95d63e2154a |
children | da91efe96a93 |
line wrap: on
line source
/* * Copyright (c) 2007, 2010, 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); \ } \ } class MarkRefsIntoClosure: public OopsInGenClosure { 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); inline void do_oop_nv(oop* p) { MarkRefsIntoClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { MarkRefsIntoClosure::do_oop_work(p); } bool do_header() { return true; } Prefetch::style prefetch_style() { return Prefetch::do_read; } }; // A variant of the above used in certain kinds of CMS // marking verification. class MarkRefsIntoVerifyClosure: public OopsInGenClosure { 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); inline void do_oop_nv(oop* p) { MarkRefsIntoVerifyClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { MarkRefsIntoVerifyClosure::do_oop_work(p); } bool do_header() { return true; } Prefetch::style prefetch_style() { return Prefetch::do_read; } }; // KlassRememberingOopClosure is used when marking of the permanent generation // is being done. It adds fields to support revisiting of klasses // for class unloading. _should_remember_klasses should be set to // indicate if klasses should be remembered. Currently that is whenever // CMS class unloading is turned on. The _revisit_stack is used // to save the klasses for later processing. class KlassRememberingOopClosure : public OopClosure { protected: CMSCollector* _collector; CMSMarkStack* _revisit_stack; bool const _should_remember_klasses; public: void check_remember_klasses() const PRODUCT_RETURN; virtual const bool should_remember_klasses() const { check_remember_klasses(); return _should_remember_klasses; } virtual void remember_klass(Klass* k); KlassRememberingOopClosure(CMSCollector* collector, ReferenceProcessor* rp, CMSMarkStack* revisit_stack); }; // Similar to KlassRememberingOopClosure for use when multiple // GC threads will execute the closure. class Par_KlassRememberingOopClosure : public KlassRememberingOopClosure { public: Par_KlassRememberingOopClosure(CMSCollector* collector, ReferenceProcessor* rp, CMSMarkStack* revisit_stack): KlassRememberingOopClosure(collector, rp, revisit_stack) {} virtual void remember_klass(Klass* k); }; // The non-parallel version (the parallel version appears further below). class PushAndMarkClosure: public KlassRememberingOopClosure { private: 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, CMSMarkStack* revisit_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); } bool do_header() { return true; } Prefetch::style prefetch_style() { return Prefetch::do_read; } // In support of class unloading virtual const bool should_remember_mdo() const { return false; // return _should_remember_klasses; } virtual void remember_mdo(DataLayout* v); }; // In the parallel case, the revisit stack, 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 Par_KlassRememberingOopClosure { private: 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, CMSMarkStack* revisit_stack); 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); } bool do_header() { return true; } Prefetch::style prefetch_style() { return Prefetch::do_read; } // In support of class unloading virtual const bool should_remember_mdo() const { return false; // return _should_remember_klasses; } virtual void remember_mdo(DataLayout* v); }; // The non-parallel version (the parallel version appears further below). class MarkRefsIntoAndScanClosure: public OopsInGenClosure { 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, CMSMarkStack* revisit_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); } bool do_header() { return true; } Prefetch::style prefetch_style() { return Prefetch::do_read; } void set_freelistLock(Mutex* m) { _freelistLock = m; } virtual const bool should_remember_klasses() const { return _pushAndMarkClosure.should_remember_klasses(); } virtual void remember_klass(Klass* k) { _pushAndMarkClosure.remember_klass(k); } 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 OopsInGenClosure { 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, CMSMarkStack* revisit_stack); 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); } bool do_header() { return true; } // When ScanMarkedObjectsAgainClosure is used, // it passes [Par_]MarkRefsIntoAndScanClosure to oop_oop_iterate(), // and this delegation is used. virtual const bool should_remember_klasses() const { return _par_pushAndMarkClosure.should_remember_klasses(); } // See comment on should_remember_klasses() above. virtual void remember_klass(Klass* k) { _par_pushAndMarkClosure.remember_klass(k); } 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 KlassRememberingOopClosure { private: 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, CMSMarkStack* revisitStack, 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); } // In support of class unloading virtual const bool should_remember_mdo() const { return false; // return _should_remember_klasses; } virtual void remember_mdo(DataLayout* v); // 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 Par_KlassRememberingOopClosure { private: 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, CMSMarkStack* revisit_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); } // In support of class unloading virtual const bool should_remember_mdo() const { return false; // return _should_remember_klasses; } virtual void remember_mdo(DataLayout* v); // 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 KlassRememberingOopClosure { private: 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, CMSMarkStack* revisit_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 Par_KlassRememberingOopClosure { private: MemRegion _span; OopTaskQueue* _work_queue; CMSBitMap* _bit_map; protected: DO_OOP_WORK_DEFN public: CMSInnerParMarkAndPushClosure(CMSCollector* collector, MemRegion span, CMSBitMap* bit_map, CMSMarkStack* revisit_stack, 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 Par_KlassRememberingOopClosure { 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, CMSMarkStack* revisit_stack, OopTaskQueue* work_queue); virtual void do_oop(oop* p); virtual void do_oop(narrowOop* p); inline void do_oop_nv(oop* p) { CMSParKeepAliveClosure::do_oop_work(p); } inline void do_oop_nv(narrowOop* p) { CMSParKeepAliveClosure::do_oop_work(p); } }; #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP