075c1335cb
Modifications to G1 so as to allow the use of compressed oops. Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
179 lines
5.8 KiB
C++
179 lines
5.8 KiB
C++
/*
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* Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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class Generation;
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class HeapWord;
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class CardTableRS;
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class CardTableModRefBS;
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class DefNewGeneration;
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template<class E> class GenericTaskQueue;
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typedef GenericTaskQueue<oop> OopTaskQueue;
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template<class E> class GenericTaskQueueSet;
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typedef GenericTaskQueueSet<oop> OopTaskQueueSet;
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// Closure for iterating roots from a particular generation
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// Note: all classes deriving from this MUST call this do_barrier
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// method at the end of their own do_oop method!
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// Note: no do_oop defined, this is an abstract class.
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class OopsInGenClosure : public OopClosure {
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private:
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Generation* _orig_gen; // generation originally set in ctor
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Generation* _gen; // generation being scanned
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protected:
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// Some subtypes need access.
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HeapWord* _gen_boundary; // start of generation
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CardTableRS* _rs; // remembered set
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// For assertions
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Generation* generation() { return _gen; }
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CardTableRS* rs() { return _rs; }
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// Derived classes that modify oops so that they might be old-to-young
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// pointers must call the method below.
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template <class T> void do_barrier(T* p);
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// Version for use by closures that may be called in parallel code.
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template <class T> void par_do_barrier(T* p);
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public:
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OopsInGenClosure() : OopClosure(NULL),
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_orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
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OopsInGenClosure(Generation* gen);
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void set_generation(Generation* gen);
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void reset_generation() { _gen = _orig_gen; }
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// Problem with static closures: must have _gen_boundary set at some point,
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// but cannot do this until after the heap is initialized.
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void set_orig_generation(Generation* gen) {
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_orig_gen = gen;
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set_generation(gen);
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}
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HeapWord* gen_boundary() { return _gen_boundary; }
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};
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// Closure for scanning DefNewGeneration.
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//
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// This closure will perform barrier store calls for ALL
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// pointers in scanned oops.
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class ScanClosure: public OopsInGenClosure {
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protected:
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DefNewGeneration* _g;
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HeapWord* _boundary;
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bool _gc_barrier;
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template <class T> inline void do_oop_work(T* p);
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public:
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ScanClosure(DefNewGeneration* g, bool gc_barrier);
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virtual void do_oop(oop* p);
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virtual void do_oop(narrowOop* p);
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inline void do_oop_nv(oop* p);
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inline void do_oop_nv(narrowOop* p);
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bool do_header() { return false; }
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Prefetch::style prefetch_style() {
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return Prefetch::do_write;
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}
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};
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// Closure for scanning DefNewGeneration.
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//
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// This closure only performs barrier store calls on
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// pointers into the DefNewGeneration. This is less
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// precise, but faster, than a ScanClosure
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class FastScanClosure: public OopsInGenClosure {
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protected:
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DefNewGeneration* _g;
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HeapWord* _boundary;
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bool _gc_barrier;
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template <class T> inline void do_oop_work(T* p);
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public:
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FastScanClosure(DefNewGeneration* g, bool gc_barrier);
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virtual void do_oop(oop* p);
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virtual void do_oop(narrowOop* p);
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inline void do_oop_nv(oop* p);
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inline void do_oop_nv(narrowOop* p);
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bool do_header() { return false; }
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Prefetch::style prefetch_style() {
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return Prefetch::do_write;
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}
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};
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class FilteringClosure: public OopClosure {
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private:
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HeapWord* _boundary;
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OopClosure* _cl;
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protected:
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template <class T> inline void do_oop_work(T* p) {
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T heap_oop = oopDesc::load_heap_oop(p);
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if (!oopDesc::is_null(heap_oop)) {
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oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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if ((HeapWord*)obj < _boundary) {
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_cl->do_oop(p);
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}
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}
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}
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public:
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FilteringClosure(HeapWord* boundary, OopClosure* cl) :
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OopClosure(cl->_ref_processor), _boundary(boundary),
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_cl(cl) {}
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virtual void do_oop(oop* p);
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virtual void do_oop(narrowOop* p);
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inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); }
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inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); }
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bool do_header() { return false; }
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};
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// Closure for scanning DefNewGeneration's weak references.
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// NOTE: very much like ScanClosure but not derived from
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// OopsInGenClosure -- weak references are processed all
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// at once, with no notion of which generation they were in.
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class ScanWeakRefClosure: public OopClosure {
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protected:
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DefNewGeneration* _g;
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HeapWord* _boundary;
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template <class T> inline void do_oop_work(T* p);
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public:
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ScanWeakRefClosure(DefNewGeneration* g);
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virtual void do_oop(oop* p);
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virtual void do_oop(narrowOop* p);
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inline void do_oop_nv(oop* p);
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inline void do_oop_nv(narrowOop* p);
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};
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class VerifyOopClosure: public OopClosure {
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protected:
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template <class T> inline void do_oop_work(T* p) {
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oop obj = oopDesc::load_decode_heap_oop(p);
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guarantee(obj->is_oop_or_null(), "invalid oop");
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}
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public:
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virtual void do_oop(oop* p);
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virtual void do_oop(narrowOop* p);
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static VerifyOopClosure verify_oop;
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};
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