jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1OopClosures.hpp@2c6ef90f030a (annotated)

src/share/vm/gc_implementation/g1/g1OopClosures.hpp@2c6ef90f030a (annotated)

src/share/vm/gc_implementation/g1/g1OopClosures.hpp

Mon, 07 Jul 2014 10:12:40 +0200

author: stefank
date: Mon, 07 Jul 2014 10:12:40 +0200
changeset 6992: 2c6ef90f030a
parent 6939: cd43876f692e
child 7535: 7ae4e26cb1e0
child 7651: c132be0fb74d
child 7971: b554c7fa9478
permissions: -rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

 /*
  * 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
 #include "memory/iterator.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 <class T> 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 <class T> 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 <class T> void do_klass_barrier(T* p, oop new_obj);
 };
 template <G1Barrier barrier, G1Mark do_mark_object>
 class G1ParCopyClosure : public G1ParCopyHelper {
 private:
   template <class T> 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 <class T> 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); }
   G1CollectedHeap*      g1()  { return _g1; };
   G1ParScanThreadState* pss() { return _par_scan_state; }
   ReferenceProcessor*   rp()  { return _ref_processor; };
 };
 typedef G1ParCopyClosure<G1BarrierNone,  G1MarkNone>             G1ParScanExtRootClosure;
 typedef G1ParCopyClosure<G1BarrierNone,  G1MarkFromRoot>         G1ParScanAndMarkExtRootClosure;
 typedef G1ParCopyClosure<G1BarrierNone,  G1MarkPromotedFromRoot> G1ParScanAndMarkWeakExtRootClosure;
 // We use a separate closure to handle references during evacuation
 // failure processing.
 typedef G1ParCopyClosure<G1BarrierEvac, G1MarkNone> 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 <class T> 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 <class T> 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 MetadataAwareOopClosure {
 protected:
   ConcurrentMark*    _cm;
 private:
   G1CollectedHeap*   _g1h;
   CMTask*            _task;
 public:
   G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
   template <class T> 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 MetadataAwareOopClosure {
 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 <class T> 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 <class T> 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 <class T> 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 <class T> 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 <class T> 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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1OopClosures.hpp@2c6ef90f030a (annotated)

src/share/vm/gc_implementation/g1/g1OopClosures.hpp