Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 1782:f353275af40e
6981773: incorrect fill value with OptimizeFill
Reviewed-by: kvn, twisti
author | never |
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date | Thu, 02 Sep 2010 11:40:02 -0700 |
parents | a03ae377b2e8 |
children | c32059ef4dc0 |
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/* * Copyright (c) 2001, 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. * */ // A G1RemSet provides ways of iterating over pointers into a selected // collection set. class G1CollectedHeap; class CardTableModRefBarrierSet; class HRInto_G1RemSet; class ConcurrentG1Refine; class G1RemSet: public CHeapObj { protected: G1CollectedHeap* _g1; unsigned _conc_refine_cards; size_t n_workers(); public: G1RemSet(G1CollectedHeap* g1) : _g1(g1), _conc_refine_cards(0) {} // Invoke "blk->do_oop" on all pointers into the CS in object in regions // outside the CS (having invoked "blk->set_region" to set the "from" // region correctly beforehand.) The "worker_i" param is for the // parallel case where the number of the worker thread calling this // function can be helpful in partitioning the work to be done. It // should be the same as the "i" passed to the calling thread's // work(i) function. In the sequential case this param will be ingored. virtual void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, int worker_i) = 0; // Prepare for and cleanup after an oops_into_collection_set_do // call. Must call each of these once before and after (in sequential // code) any threads call oops into collection set do. (This offers an // opportunity to sequential setup and teardown of structures needed by a // parallel iteration over the CS's RS.) virtual void prepare_for_oops_into_collection_set_do() = 0; virtual void cleanup_after_oops_into_collection_set_do() = 0; // If "this" is of the given subtype, return "this", else "NULL". virtual HRInto_G1RemSet* as_HRInto_G1RemSet() { return NULL; } // Record, if necessary, the fact that *p (where "p" is in region "from", // and is, a fortiori, required to be non-NULL) has changed to its new value. virtual void write_ref(HeapRegion* from, oop* p) = 0; virtual void write_ref(HeapRegion* from, narrowOop* p) = 0; virtual void par_write_ref(HeapRegion* from, oop* p, int tid) = 0; virtual void par_write_ref(HeapRegion* from, narrowOop* p, int tid) = 0; // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region // or card, respectively, such that a region or card with a corresponding // 0 bit contains no part of any live object. Eliminates any remembered // set entries that correspond to dead heap ranges. virtual void scrub(BitMap* region_bm, BitMap* card_bm) = 0; // Like the above, but assumes is called in parallel: "worker_num" is the // parallel thread id of the current thread, and "claim_val" is the // value that should be used to claim heap regions. virtual void scrub_par(BitMap* region_bm, BitMap* card_bm, int worker_num, int claim_val) = 0; // Refine the card corresponding to "card_ptr". If "sts" is non-NULL, // join and leave around parts that must be atomic wrt GC. (NULL means // being done at a safepoint.) // With some implementations of this routine, when check_for_refs_into_cset // is true, a true result may be returned if the given card contains oops // that have references into the current collection set. virtual bool concurrentRefineOneCard(jbyte* card_ptr, int worker_i, bool check_for_refs_into_cset) { return false; } // Print any relevant summary info. virtual void print_summary_info() {} // Prepare remebered set for verification. virtual void prepare_for_verify() {}; }; // The simplest possible G1RemSet: iterates over all objects in non-CS // regions, searching for pointers into the CS. class StupidG1RemSet: public G1RemSet { public: StupidG1RemSet(G1CollectedHeap* g1) : G1RemSet(g1) {} void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, int worker_i); void prepare_for_oops_into_collection_set_do() {} void cleanup_after_oops_into_collection_set_do() {} // Nothing is necessary in the version below. void write_ref(HeapRegion* from, oop* p) {} void write_ref(HeapRegion* from, narrowOop* p) {} void par_write_ref(HeapRegion* from, oop* p, int tid) {} void par_write_ref(HeapRegion* from, narrowOop* p, int tid) {} void scrub(BitMap* region_bm, BitMap* card_bm) {} void scrub_par(BitMap* region_bm, BitMap* card_bm, int worker_num, int claim_val) {} }; // A G1RemSet in which each heap region has a rem set that records the // external heap references into it. Uses a mod ref bs to track updates, // so that they can be used to update the individual region remsets. class HRInto_G1RemSet: public G1RemSet { protected: enum SomePrivateConstants { UpdateRStoMergeSync = 0, MergeRStoDoDirtySync = 1, DoDirtySync = 2, LastSync = 3, SeqTask = 0, NumSeqTasks = 1 }; CardTableModRefBS* _ct_bs; SubTasksDone* _seq_task; G1CollectorPolicy* _g1p; ConcurrentG1Refine* _cg1r; size_t* _cards_scanned; size_t _total_cards_scanned; // _traversal_in_progress is "true" iff a traversal is in progress. bool _traversal_in_progress; void set_traversal(bool b) { _traversal_in_progress = b; } // Used for caching the closure that is responsible for scanning // references into the collection set. OopsInHeapRegionClosure** _cset_rs_update_cl; // The routine that performs the actual work of refining a dirty // card. // If check_for_refs_into_refs is true then a true result is returned // if the card contains oops that have references into the current // collection set. bool concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, bool check_for_refs_into_cset); protected: template <class T> void write_ref_nv(HeapRegion* from, T* p); template <class T> void par_write_ref_nv(HeapRegion* from, T* p, int tid); public: // This is called to reset dual hash tables after the gc pause // is finished and the initial hash table is no longer being // scanned. void cleanupHRRS(); HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); ~HRInto_G1RemSet(); void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, int worker_i); void prepare_for_oops_into_collection_set_do(); void cleanup_after_oops_into_collection_set_do(); void scanRS(OopsInHeapRegionClosure* oc, int worker_i); template <class T> void scanNewRefsRS_work(OopsInHeapRegionClosure* oc, int worker_i); void scanNewRefsRS(OopsInHeapRegionClosure* oc, int worker_i) { if (UseCompressedOops) { scanNewRefsRS_work<narrowOop>(oc, worker_i); } else { scanNewRefsRS_work<oop>(oc, worker_i); } } void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i); HeapRegion* calculateStartRegion(int i); HRInto_G1RemSet* as_HRInto_G1RemSet() { return this; } CardTableModRefBS* ct_bs() { return _ct_bs; } size_t cardsScanned() { return _total_cards_scanned; } // Record, if necessary, the fact that *p (where "p" is in region "from", // which is required to be non-NULL) has changed to a new non-NULL value. // [Below the virtual version calls a non-virtual protected // workhorse that is templatified for narrow vs wide oop.] inline void write_ref(HeapRegion* from, oop* p) { write_ref_nv(from, p); } inline void write_ref(HeapRegion* from, narrowOop* p) { write_ref_nv(from, p); } inline void par_write_ref(HeapRegion* from, oop* p, int tid) { par_write_ref_nv(from, p, tid); } inline void par_write_ref(HeapRegion* from, narrowOop* p, int tid) { par_write_ref_nv(from, p, tid); } bool self_forwarded(oop obj); void scrub(BitMap* region_bm, BitMap* card_bm); void scrub_par(BitMap* region_bm, BitMap* card_bm, int worker_num, int claim_val); // If check_for_refs_into_cset is true then a true result is returned // if the card contains oops that have references into the current // collection set. virtual bool concurrentRefineOneCard(jbyte* card_ptr, int worker_i, bool check_for_refs_into_cset); virtual void print_summary_info(); virtual void prepare_for_verify(); }; #define G1_REM_SET_LOGGING 0 class CountNonCleanMemRegionClosure: public MemRegionClosure { G1CollectedHeap* _g1; int _n; HeapWord* _start_first; public: CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : _g1(g1), _n(0), _start_first(NULL) {} void do_MemRegion(MemRegion mr); int n() { return _n; }; HeapWord* start_first() { return _start_first; } }; class UpdateRSOopClosure: public OopClosure { HeapRegion* _from; HRInto_G1RemSet* _rs; int _worker_i; template <class T> void do_oop_work(T* p); public: UpdateRSOopClosure(HRInto_G1RemSet* rs, int worker_i = 0) : _from(NULL), _rs(rs), _worker_i(worker_i) { guarantee(_rs != NULL, "Requires an HRIntoG1RemSet"); } void set_from(HeapRegion* from) { assert(from != NULL, "from region must be non-NULL"); _from = from; } virtual void do_oop(narrowOop* p) { do_oop_work(p); } virtual void do_oop(oop* p) { do_oop_work(p); } // Override: this closure is idempotent. // bool idempotent() { return true; } bool apply_to_weak_ref_discovered_field() { return true; } }; class UpdateRSetImmediate: public OopsInHeapRegionClosure { private: G1RemSet* _g1_rem_set; template <class T> void do_oop_work(T* p); public: UpdateRSetImmediate(G1RemSet* rs) : _g1_rem_set(rs) {} virtual void do_oop(narrowOop* p) { do_oop_work(p); } virtual void do_oop( oop* p) { do_oop_work(p); } };