Mercurial > hg > truffle
view src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 17342:a690ca62772c
add array length information in PartialEvaluator before expanding @ExplodeLoop
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Mon, 06 Oct 2014 09:46:27 +0200 |
parents | 4ca6dc0799b6 |
children | 52b4284cb496 |
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/* * Copyright (c) 2001, 2013, 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_G1_G1REMSET_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP #include "gc_implementation/g1/g1RemSetSummary.hpp" // A G1RemSet provides ways of iterating over pointers into a selected // collection set. class G1CollectedHeap; class CardTableModRefBarrierSet; class ConcurrentG1Refine; // 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 G1RemSet: public CHeapObj<mtGC> { private: G1RemSetSummary _prev_period_summary; protected: G1CollectedHeap* _g1; size_t _conc_refine_cards; uint n_workers(); 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; // Used for caching the closure that is responsible for scanning // references into the collection set. OopsInHeapRegionClosure** _cset_rs_update_cl; // Print the given summary info virtual void print_summary_info(G1RemSetSummary * summary, const char * header = NULL); 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(); G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); ~G1RemSet(); // Invoke "blk->do_oop" on all pointers into the collection set // from objects in regions outside the collection set (having // invoked "blk->set_region" to set the "from" region correctly // beforehand.) // // Invoke code_root_cl->do_code_blob on the unmarked nmethods // on the strong code roots list for each region in the // collection set. // // The "worker_i" param is for the parallel case where the id // 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 ignored. void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, CodeBlobToOopClosure* code_root_cl, int worker_i); // 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.) void prepare_for_oops_into_collection_set_do(); void cleanup_after_oops_into_collection_set_do(); void scanRS(OopsInHeapRegionClosure* oc, CodeBlobToOopClosure* code_root_cl, int worker_i); void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i); 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. template <class T> void write_ref(HeapRegion* from, T* p); template <class T> void par_write_ref(HeapRegion* from, T* p, int tid); // 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. void scrub(BitMap* region_bm, BitMap* card_bm); // 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. void scrub_par(BitMap* region_bm, BitMap* card_bm, uint worker_num, int claim_val); // Refine the card corresponding to "card_ptr". // If check_for_refs_into_cset is true, a true result is returned // if the given card contains oops that have references into the // current collection set. virtual bool refine_card(jbyte* card_ptr, int worker_i, bool check_for_refs_into_cset); // Print accumulated summary info from the start of the VM. virtual void print_summary_info(); // Print accumulated summary info from the last time called. virtual void print_periodic_summary_info(const char* header); // Prepare remembered set for verification. virtual void prepare_for_verify(); size_t conc_refine_cards() const { return _conc_refine_cards; } }; 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 ExtendedOopClosure { HeapRegion* _from; G1RemSet* _rs; int _worker_i; template <class T> void do_oop_work(T* p); public: UpdateRSOopClosure(G1RemSet* rs, int worker_i = 0) : _from(NULL), _rs(rs), _worker_i(worker_i) {} 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); } }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP