jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1OopClosures.hpp@663cb89032b1 (annotated)

src/share/vm/gc_implementation/g1/g1OopClosures.hpp@663cb89032b1 (annotated)

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

Tue, 20 Sep 2011 15:39:17 -0700

author: johnc
date: Tue, 20 Sep 2011 15:39:17 -0700
changeset 3169: 663cb89032b1
parent 3086: eeae91c9baba
child 3175: 4dfb2df418f2
permissions: -rw-r--r--

7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
Summary: As a result of the changes for 7080389, an evacuation failure during an initial mark pause may result in some root objects not being marked. Pass whether the caller is a root scanning closure into the evacuation failure handling code so that the thread that successfully forwards an object to itself also marks the object.
Reviewed-by: ysr, brutisso, tonyp

 /*
  * Copyright (c) 2001, 2011, 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
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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP
 class HeapRegion;
 class G1CollectedHeap;
 class G1RemSet;
 class ConcurrentMark;
 class DirtyCardToOopClosure;
 class CMBitMap;
 class CMMarkStack;
 class G1ParScanThreadState;
 class CMTask;
 // 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:
   void set_region(HeapRegion* from) { _from = from; }
 };
 class G1ParClosureSuper : public OopsInHeapRegionClosure {
 protected:
   G1CollectedHeap* _g1;
   G1RemSet* _g1_rem;
   ConcurrentMark* _cm;
   G1ParScanThreadState* _par_scan_state;
   bool _during_initial_mark;
   bool _mark_in_progress;
 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_object(T* p);
   oop copy_to_survivor_space(oop obj, bool should_mark_root,
                                       bool should_mark_copy);
 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_object>
 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);
   }
   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 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; }
 };
 // Closure for iterating over object fields during concurrent marking
 class G1CMOopClosure : public OopClosure {
   G1CollectedHeap*   _g1h;
   ConcurrentMark*    _cm;
   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); }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1OopClosures.hpp@663cb89032b1 (annotated)

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