/* * Copyright (c) 2001, 2014, 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_G1OOPCLOSURES_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP class HeapRegion; class G1CollectedHeap; class G1RemSet; class ConcurrentMark; class DirtyCardToOopClosure; class CMBitMap; class CMMarkStack; class G1ParScanThreadState; class CMTask; class ReferenceProcessor; // A class that scans oops in a given heap region (much as OopsInGenClosure // scans oops in a generation.) class OopsInHeapRegionClosure: public ExtendedOopClosure { protected: HeapRegion* _from; public: void set_region(HeapRegion* from) { _from = from; } }; class G1ParClosureSuper : public OopsInHeapRegionClosure { protected: G1CollectedHeap* _g1; G1ParScanThreadState* _par_scan_state; uint _worker_id; public: // Initializes the instance, leaving _par_scan_state uninitialized. Must be done // later using the set_par_scan_thread_state() method. G1ParClosureSuper(G1CollectedHeap* g1); G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); bool apply_to_weak_ref_discovered_field() { return true; } void set_par_scan_thread_state(G1ParScanThreadState* par_scan_state); }; class G1ParPushHeapRSClosure : public G1ParClosureSuper { public: G1ParPushHeapRSClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state): G1ParClosureSuper(g1, par_scan_state) { } template void do_oop_nv(T* p); virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; class G1ParScanClosure : public G1ParClosureSuper { public: G1ParScanClosure(G1CollectedHeap* g1, ReferenceProcessor* rp) : G1ParClosureSuper(g1) { assert(_ref_processor == NULL, "sanity"); _ref_processor = rp; } template void do_oop_nv(T* p); virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; // Add back base class for metadata class G1ParCopyHelper : public G1ParClosureSuper { protected: Klass* _scanned_klass; ConcurrentMark* _cm; // Mark the object if it's not already marked. This is used to mark // objects pointed to by roots that are guaranteed not to move // during the GC (i.e., non-CSet objects). It is MT-safe. void mark_object(oop obj); // Mark the object if it's not already marked. This is used to mark // objects pointed to by roots that have been forwarded during a // GC. It is MT-safe. void mark_forwarded_object(oop from_obj, oop to_obj); public: G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); void set_scanned_klass(Klass* k) { _scanned_klass = k; } template void do_klass_barrier(T* p, oop new_obj); }; template class G1ParCopyClosure : public G1ParCopyHelper { private: template void do_oop_work(T* p); public: G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : G1ParCopyHelper(g1, par_scan_state) { assert(_ref_processor == NULL, "sanity"); } template void do_oop_nv(T* p) { do_oop_work(p); } virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; typedef G1ParCopyClosure G1ParScanExtRootClosure; typedef G1ParCopyClosure G1ParScanMetadataClosure; typedef G1ParCopyClosure G1ParScanAndMarkExtRootClosure; typedef G1ParCopyClosure G1ParScanAndMarkMetadataClosure; // We use a separate closure to handle references during evacuation // failure processing. typedef G1ParCopyClosure G1ParScanHeapEvacFailureClosure; class FilterIntoCSClosure: public ExtendedOopClosure { G1CollectedHeap* _g1; OopClosure* _oc; DirtyCardToOopClosure* _dcto_cl; public: FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, G1CollectedHeap* g1, OopClosure* oc) : _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { } template void do_oop_nv(T* p); virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } bool apply_to_weak_ref_discovered_field() { return true; } }; class FilterOutOfRegionClosure: public ExtendedOopClosure { HeapWord* _r_bottom; HeapWord* _r_end; OopClosure* _oc; public: FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); template void do_oop_nv(T* p); virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } bool apply_to_weak_ref_discovered_field() { return true; } }; // Closure for iterating over object fields during concurrent marking class G1CMOopClosure : public ExtendedOopClosure { private: G1CollectedHeap* _g1h; ConcurrentMark* _cm; CMTask* _task; public: G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); template void do_oop_nv(T* p); virtual void do_oop( oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; // Closure to scan the root regions during concurrent marking class G1RootRegionScanClosure : public ExtendedOopClosure { private: G1CollectedHeap* _g1h; ConcurrentMark* _cm; uint _worker_id; public: G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, uint worker_id) : _g1h(g1h), _cm(cm), _worker_id(worker_id) { } template void do_oop_nv(T* p); virtual void do_oop( oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; // Closure that applies the given two closures in sequence. // Used by the RSet refinement code (when updating RSets // during an evacuation pause) to record cards containing // pointers into the collection set. class G1Mux2Closure : public ExtendedOopClosure { OopClosure* _c1; OopClosure* _c2; public: G1Mux2Closure(OopClosure *c1, OopClosure *c2); template void do_oop_nv(T* p); virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; // A closure that returns true if it is actually applied // to a reference class G1TriggerClosure : public ExtendedOopClosure { bool _triggered; public: G1TriggerClosure(); bool triggered() const { return _triggered; } template void do_oop_nv(T* p); virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; // A closure which uses a triggering closure to determine // whether to apply an oop closure. class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure { G1TriggerClosure* _trigger_cl; OopClosure* _oop_cl; public: G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); template void do_oop_nv(T* p); virtual void do_oop(oop* p) { do_oop_nv(p); } virtual void do_oop(narrowOop* p) { do_oop_nv(p); } }; class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure { G1CollectedHeap* _g1; G1RemSet* _g1_rem_set; HeapRegion* _from; OopsInHeapRegionClosure* _push_ref_cl; bool _record_refs_into_cset; uint _worker_i; public: G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, G1RemSet* rs, OopsInHeapRegionClosure* push_ref_cl, bool record_refs_into_cset, uint worker_i = 0); void set_from(HeapRegion* from) { assert(from != NULL, "from region must be non-NULL"); _from = from; } bool self_forwarded(oop obj) { bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); return result; } bool apply_to_weak_ref_discovered_field() { return true; } template void do_oop_nv(T* p); virtual void do_oop(narrowOop* p) { do_oop_nv(p); } virtual void do_oop(oop* p) { do_oop_nv(p); } }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP