jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1OopClosures.hpp@d30fa85f9994

6484965: G1: piggy-back liveness accounting phase on marking
Summary: Remove the separate counting phase of concurrent marking by tracking the amount of marked bytes and the cards spanned by marked objects in marking task/worker thread local data structures, which are updated as individual objects are marked.
Reviewed-by: brutisso, tonyp

     1 /*

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     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP

    28 class HeapRegion;

    29 class G1CollectedHeap;

    30 class G1RemSet;

    31 class ConcurrentMark;

    32 class DirtyCardToOopClosure;

    33 class CMBitMap;

    34 class CMMarkStack;

    35 class G1ParScanThreadState;

    36 class CMTask;

    37 class ReferenceProcessor;

    39 // A class that scans oops in a given heap region (much as OopsInGenClosure

    40 // scans oops in a generation.)

    41 class OopsInHeapRegionClosure: public OopsInGenClosure {

    42 protected:

    43   HeapRegion* _from;

    44 public:

    45   void set_region(HeapRegion* from) { _from = from; }

    46 };

    48 class G1ParClosureSuper : public OopsInHeapRegionClosure {

    49 protected:

    50   G1CollectedHeap* _g1;

    51   G1RemSet* _g1_rem;

    52   ConcurrentMark* _cm;

    53   G1ParScanThreadState* _par_scan_state;

    54   uint _worker_id;

    55   bool _during_initial_mark;

    56   bool _mark_in_progress;

    57 public:

    58   G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);

    59   bool apply_to_weak_ref_discovered_field() { return true; }

    60 };

    62 class G1ParPushHeapRSClosure : public G1ParClosureSuper {

    63 public:

    64   G1ParPushHeapRSClosure(G1CollectedHeap* g1,

    65                          G1ParScanThreadState* par_scan_state):

    66     G1ParClosureSuper(g1, par_scan_state) { }

    68   template <class T> void do_oop_nv(T* p);

    69   virtual void do_oop(oop* p)          { do_oop_nv(p); }

    70   virtual void do_oop(narrowOop* p)    { do_oop_nv(p); }

    71 };

    73 class G1ParScanClosure : public G1ParClosureSuper {

    74 public:

    75   G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :

    76     G1ParClosureSuper(g1, par_scan_state)

    77   {

    78     assert(_ref_processor == NULL, "sanity");

    79     _ref_processor = rp;

    80   }

    82   template <class T> void do_oop_nv(T* p);

    83   virtual void do_oop(oop* p)          { do_oop_nv(p); }

    84   virtual void do_oop(narrowOop* p)    { do_oop_nv(p); }

    85 };

    87 #define G1_PARTIAL_ARRAY_MASK 0x2

    89 template <class T> inline bool has_partial_array_mask(T* ref) {

    90   return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;

    91 }

    93 template <class T> inline T* set_partial_array_mask(T obj) {

    94   assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");

    95   return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);

    96 }

    98 template <class T> inline oop clear_partial_array_mask(T* ref) {

    99   return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);

   100 }

   102 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {

   103   G1ParScanClosure _scanner;

   105 public:

   106   G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :

   107     G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp)

   108   {

   109     assert(_ref_processor == NULL, "sanity");

   110   }

   112   G1ParScanClosure* scanner() {

   113     return &_scanner;

   114   }

   116   template <class T> void do_oop_nv(T* p);

   117   virtual void do_oop(oop* p)       { do_oop_nv(p); }

   118   virtual void do_oop(narrowOop* p) { do_oop_nv(p); }

   119 };

   122 class G1ParCopyHelper : public G1ParClosureSuper {

   123   G1ParScanClosure *_scanner;

   124 protected:

   125   // Mark the object if it's not already marked. This is used to mark

   126   // objects pointed to by roots that are guaranteed not to move

   127   // during the GC (i.e., non-CSet objects). It is MT-safe.

   128   void mark_object(oop obj);

   130   // Mark the object if it's not already marked. This is used to mark

   131   // objects pointed to by roots that have been forwarded during a

   132   // GC. It is MT-safe.

   133   void mark_forwarded_object(oop from_obj, oop to_obj);

   135   oop copy_to_survivor_space(oop obj);

   137 public:

   138   G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,

   139                   G1ParScanClosure *scanner) :

   140     G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }

   141 };

   143 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object>

   144 class G1ParCopyClosure : public G1ParCopyHelper {

   145   G1ParScanClosure _scanner;

   147   template <class T> void do_oop_work(T* p);

   149 public:

   150   G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,

   151                    ReferenceProcessor* rp) :

   152       _scanner(g1, par_scan_state, rp),

   153       G1ParCopyHelper(g1, par_scan_state, &_scanner) {

   154     assert(_ref_processor == NULL, "sanity");

   155   }

   157   G1ParScanClosure* scanner() { return &_scanner; }

   159   template <class T> void do_oop_nv(T* p) {

   160     do_oop_work(p);

   161   }

   162   virtual void do_oop(oop* p)       { do_oop_nv(p); }

   163   virtual void do_oop(narrowOop* p) { do_oop_nv(p); }

   164 };

   166 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;

   167 typedef G1ParCopyClosure<true,  G1BarrierNone, false> G1ParScanPermClosure;

   169 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;

   170 typedef G1ParCopyClosure<true,  G1BarrierNone, true> G1ParScanAndMarkPermClosure;

   172 // The following closure types are no longer used but are retained

   173 // for historical reasons:

   174 // typedef G1ParCopyClosure<false, G1BarrierRS,   false> G1ParScanHeapRSClosure;

   175 // typedef G1ParCopyClosure<false, G1BarrierRS,   true> G1ParScanAndMarkHeapRSClosure;

   177 // The following closure type is defined in g1_specialized_oop_closures.hpp:

   178 //

   179 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure;

   181 // We use a separate closure to handle references during evacuation

   182 // failure processing.

   183 // We could have used another instance of G1ParScanHeapEvacClosure

   184 // (since that closure no longer assumes that the references it

   185 // handles point into the collection set).

   187 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;

   189 class FilterIntoCSClosure: public OopClosure {

   190   G1CollectedHeap* _g1;

   191   OopClosure* _oc;

   192   DirtyCardToOopClosure* _dcto_cl;

   193 public:

   194   FilterIntoCSClosure(  DirtyCardToOopClosure* dcto_cl,

   195                         G1CollectedHeap* g1,

   196                         OopClosure* oc) :

   197     _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }

   199   template <class T> void do_oop_nv(T* p);

   200   virtual void do_oop(oop* p)        { do_oop_nv(p); }

   201   virtual void do_oop(narrowOop* p)  { do_oop_nv(p); }

   202   bool apply_to_weak_ref_discovered_field() { return true; }

   203   bool do_header() { return false; }

   204 };

   206 class FilterOutOfRegionClosure: public OopClosure {

   207   HeapWord* _r_bottom;

   208   HeapWord* _r_end;

   209   OopClosure* _oc;

   210   int _out_of_region;

   211 public:

   212   FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);

   213   template <class T> void do_oop_nv(T* p);

   214   virtual void do_oop(oop* p) { do_oop_nv(p); }

   215   virtual void do_oop(narrowOop* p) { do_oop_nv(p); }

   216   bool apply_to_weak_ref_discovered_field() { return true; }

   217   bool do_header() { return false; }

   218   int out_of_region() { return _out_of_region; }

   219 };

   221 // Closure for iterating over object fields during concurrent marking

   222 class G1CMOopClosure : public OopClosure {

   223   G1CollectedHeap*   _g1h;

   224   ConcurrentMark*    _cm;

   225   CMTask*            _task;

   226 public:

   227   G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);

   228   template <class T> void do_oop_nv(T* p);

   229   virtual void do_oop(      oop* p) { do_oop_nv(p); }

   230   virtual void do_oop(narrowOop* p) { do_oop_nv(p); }

   231 };

   233 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/g1/g1OopClosures.hpp@d30fa85f9994

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