| /* |
| * Copyright (c) 2001, 2016, 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_SHARED_GENOOPCLOSURES_HPP |
| #define SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP |
| |
| #include "memory/iterator.hpp" |
| #include "oops/oop.hpp" |
| |
| class Generation; |
| class HeapWord; |
| class CardTableRS; |
| class CardTableModRefBS; |
| class DefNewGeneration; |
| class KlassRemSet; |
| |
| // 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 ExtendedOopClosure { |
| 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() : ExtendedOopClosure(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; } |
| |
| }; |
| |
| // Super class for scan closures. It contains code to dirty scanned Klasses. |
| class OopsInKlassOrGenClosure: public OopsInGenClosure { |
| Klass* _scanned_klass; |
| public: |
| OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {} |
| void set_scanned_klass(Klass* k) { |
| assert(k == NULL || _scanned_klass == NULL, "Must be"); |
| _scanned_klass = k; |
| } |
| bool is_scanning_a_klass() { return _scanned_klass != NULL; } |
| void do_klass_barrier(); |
| }; |
| |
| // Closure for scanning DefNewGeneration. |
| // |
| // This closure will perform barrier store calls for ALL |
| // pointers in scanned oops. |
| class ScanClosure: public OopsInKlassOrGenClosure { |
| 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); |
| }; |
| |
| // 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 OopsInKlassOrGenClosure { |
| 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); |
| }; |
| |
| class KlassScanClosure: public KlassClosure { |
| OopsInKlassOrGenClosure* _scavenge_closure; |
| // true if the the modified oops state should be saved. |
| bool _accumulate_modified_oops; |
| public: |
| KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure, |
| KlassRemSet* klass_rem_set_policy); |
| void do_klass(Klass* k); |
| }; |
| |
| class FilteringClosure: public ExtendedOopClosure { |
| private: |
| HeapWord* _boundary; |
| ExtendedOopClosure* _cl; |
| protected: |
| template <class T> inline void do_oop_work(T* p); |
| public: |
| FilteringClosure(HeapWord* boundary, ExtendedOopClosure* cl) : |
| ExtendedOopClosure(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); |
| inline void do_oop_nv(narrowOop* p); |
| virtual bool do_metadata() { return do_metadata_nv(); } |
| inline bool do_metadata_nv() { assert(!_cl->do_metadata(), "assumption broken, must change to 'return _cl->do_metadata()'"); 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); |
| }; |
| |
| #endif // SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP |