jdk8-mips64-public/hotspot: src/share/vm/memory/genOopClosures.hpp@f90c822e73f8 (annotated)

src/share/vm/memory/genOopClosures.hpp@f90c822e73f8 (annotated)

src/share/vm/memory/genOopClosures.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * 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_MEMORY_GENOOPCLOSURES_HPP
 #define SHARE_VM_MEMORY_GENOOPCLOSURES_HPP
 #include "memory/iterator.hpp"
 #include "oops/oop.hpp"
 class Generation;
 class HeapWord;
 class CardTableRS;
 class CardTableModRefBS;
 class DefNewGeneration;
 class KlassRemSet;
 template<class E, MEMFLAGS F, unsigned int N> class GenericTaskQueue;
 typedef GenericTaskQueue<oop, mtGC, TASKQUEUE_SIZE> OopTaskQueue;
 template<class T, MEMFLAGS F> class GenericTaskQueueSet;
 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet;
 // 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);
   Prefetch::style prefetch_style() {
     return Prefetch::do_write;
   }
 };
 // 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);
   Prefetch::style prefetch_style() {
     return Prefetch::do_write;
   }
 };
 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) {
     T heap_oop = oopDesc::load_heap_oop(p);
     if (!oopDesc::is_null(heap_oop)) {
       oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
       if ((HeapWord*)obj < _boundary) {
         _cl->do_oop(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)       { FilteringClosure::do_oop_work(p); }
   inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(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);
 };
 class VerifyOopClosure: public OopClosure {
  protected:
   template <class T> inline void do_oop_work(T* p) {
     oop obj = oopDesc::load_decode_heap_oop(p);
     guarantee(obj->is_oop_or_null(), err_msg("invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj)));
   }
  public:
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
   static VerifyOopClosure verify_oop;
 };
 #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/genOopClosures.hpp@f90c822e73f8 (annotated)

src/share/vm/memory/genOopClosures.hpp