jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1OopClosures.hpp@2d160770d2e5 (annotated)

src/share/vm/gc_implementation/g1/g1OopClosures.hpp@2d160770d2e5 (annotated)

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

Mon, 02 Aug 2010 12:51:43 -0700

author: johnc
date: Mon, 02 Aug 2010 12:51:43 -0700
changeset 2060: 2d160770d2e5
parent 1907: c18cbe5936b8
child 2216: c32059ef4dc0
permissions: -rw-r--r--

6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp

 /*
  * Copyright (c) 2001, 2009, 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.
  *
  */
 class HeapRegion;
 class G1CollectedHeap;
 class G1RemSet;
 class HRInto_G1RemSet;
 class G1RemSet;
 class ConcurrentMark;
 class DirtyCardToOopClosure;
 class CMBitMap;
 class CMMarkStack;
 class G1ParScanThreadState;
 // A class that scans oops in a given heap region (much as OopsInGenClosure
 // scans oops in a generation.)
 class OopsInHeapRegionClosure: public OopsInGenClosure {
 protected:
   HeapRegion* _from;
 public:
   virtual void set_region(HeapRegion* from) { _from = from; }
 };
 class G1ParClosureSuper : public OopsInHeapRegionClosure {
 protected:
   G1CollectedHeap* _g1;
   G1RemSet* _g1_rem;
   ConcurrentMark* _cm;
   G1ParScanThreadState* _par_scan_state;
 public:
   G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
   bool apply_to_weak_ref_discovered_field() { return true; }
 };
 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, 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); }
 };
 #define G1_PARTIAL_ARRAY_MASK 0x2
 template <class T> inline bool has_partial_array_mask(T* ref) {
   return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
 }
 template <class T> inline T* set_partial_array_mask(T obj) {
   assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
   return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
 }
 template <class T> inline oop clear_partial_array_mask(T* ref) {
   return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
 }
 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
   G1ParScanClosure _scanner;
 public:
   G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
     G1ParClosureSuper(g1, par_scan_state), _scanner(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 G1ParCopyHelper : public G1ParClosureSuper {
   G1ParScanClosure *_scanner;
 protected:
   template <class T> void mark_forwardee(T* p);
   oop copy_to_survivor_space(oop obj);
 public:
   G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
                   G1ParScanClosure *scanner) :
     G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
 };
 template<bool do_gen_barrier, G1Barrier barrier,
          bool do_mark_forwardee>
 class G1ParCopyClosure : public G1ParCopyHelper {
   G1ParScanClosure _scanner;
   template <class T> void do_oop_work(T* p);
 public:
   G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
     _scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { }
   template <class T> void do_oop_nv(T* p) {
     do_oop_work(p);
     if (do_mark_forwardee)
       mark_forwardee(p);
   }
   virtual void do_oop(oop* p)       { do_oop_nv(p); }
   virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
 };
 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
 typedef G1ParCopyClosure<true,  G1BarrierNone, false> G1ParScanPermClosure;
 typedef G1ParCopyClosure<false, G1BarrierRS,   false> G1ParScanHeapRSClosure;
 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
 typedef G1ParCopyClosure<true,  G1BarrierNone, true> G1ParScanAndMarkPermClosure;
 typedef G1ParCopyClosure<false, G1BarrierRS,   true> G1ParScanAndMarkHeapRSClosure;
 // This is the only case when we set skip_cset_test. Basically, this
 // closure is (should?) only be called directly while we're draining
 // the overflow and task queues. In that case we know that the
 // reference in question points into the collection set, otherwise we
 // would not have pushed it on the queue. The following is defined in
 // g1_specialized_oop_closures.hpp.
 // typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
 // We need a separate closure to handle references during evacuation
 // failure processing, as we cannot asume that the reference already
 // points into the collection set (like G1ParScanHeapEvacClosure does).
 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
 class FilterIntoCSClosure: public OopClosure {
   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; }
   bool do_header() { return false; }
 };
 class FilterInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
   G1CollectedHeap* _g1;
   OopsInHeapRegionClosure* _oc;
 public:
   FilterInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
                                      OopsInHeapRegionClosure* oc) :
     _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; }
   bool do_header() { return false; }
   void set_region(HeapRegion* from) {
     _oc->set_region(from);
   }
 };
 class FilterAndMarkInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
   G1CollectedHeap* _g1;
   ConcurrentMark* _cm;
   OopsInHeapRegionClosure* _oc;
 public:
   FilterAndMarkInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
                                             OopsInHeapRegionClosure* oc,
                                             ConcurrentMark* cm)
   : _g1(g1), _oc(oc), _cm(cm) { }
   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; }
   bool do_header() { return false; }
   void set_region(HeapRegion* from) {
     _oc->set_region(from);
   }
 };
 class FilterOutOfRegionClosure: public OopClosure {
   HeapWord* _r_bottom;
   HeapWord* _r_end;
   OopClosure* _oc;
   int _out_of_region;
 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; }
   bool do_header() { return false; }
   int out_of_region() { return _out_of_region; }
 };

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src/share/vm/gc_implementation/g1/g1OopClosures.hpp@2d160770d2e5 (annotated)

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