1 /*

     2  * Copyright (c) 2007, 2019, Oracle and/or its affiliates. All rights reserved.

     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

    21  * questions.

    22  *

    23  */

    24 

    25 #ifndef SHARE_GC_CMS_PAROOPCLOSURES_HPP

    26 #define SHARE_GC_CMS_PAROOPCLOSURES_HPP

    27 

    28 #include "gc/shared/genOopClosures.hpp"

    29 #include "gc/shared/taskqueue.hpp"

    30 #include "memory/padded.hpp"

    31 

    32 // Closures for ParNewGeneration

    33 

    34 class ParScanThreadState;

    35 class ParNewGeneration;

    36 typedef Padded<OopTaskQueue> ObjToScanQueue;

    37 typedef GenericTaskQueueSet<ObjToScanQueue, mtGC> ObjToScanQueueSet;

    38 class ParallelTaskTerminator;

    39 

    40 class ParScanClosure: public OopsInClassLoaderDataOrGenClosure {

    41  protected:

    42   ParScanThreadState* _par_scan_state;

    43   ParNewGeneration*   _g;

    44   HeapWord*           _boundary;

    45   template <class T> void inline par_do_barrier(T* p);

    46   template <class T> void inline do_oop_work(T* p,

    47                                              bool gc_barrier,

    48                                              bool root_scan);

    49  public:

    50   ParScanClosure(ParNewGeneration* g, ParScanThreadState* par_scan_state);

    51 };

    52 

    53 class ParScanWithBarrierClosure: public ParScanClosure {

    54  public:

    55   ParScanWithBarrierClosure(ParNewGeneration* g,

    56                             ParScanThreadState* par_scan_state) :

    57     ParScanClosure(g, par_scan_state) {}

    58   virtual void do_oop(oop* p);

    59   virtual void do_oop(narrowOop* p);

    60 };

    61 

    62 class ParScanWithoutBarrierClosure: public ParScanClosure {

    63  public:

    64   ParScanWithoutBarrierClosure(ParNewGeneration* g,

    65                                ParScanThreadState* par_scan_state) :

    66     ParScanClosure(g, par_scan_state) {}

    67   virtual void do_oop(oop* p);

    68   virtual void do_oop(narrowOop* p);

    69 };

    70 

    71 class ParRootScanWithBarrierTwoGensClosure: public ParScanClosure {

    72  public:

    73   ParRootScanWithBarrierTwoGensClosure(ParNewGeneration* g,

    74                                        ParScanThreadState* par_scan_state) :

    75     ParScanClosure(g, par_scan_state) {}

    76   virtual void do_oop(oop* p);

    77   virtual void do_oop(narrowOop* p);

    78 };

    79 

    80 class ParRootScanWithoutBarrierClosure: public ParScanClosure {

    81  public:

    82   ParRootScanWithoutBarrierClosure(ParNewGeneration* g,

    83                                    ParScanThreadState* par_scan_state) :

    84     ParScanClosure(g, par_scan_state) {}

    85   virtual void do_oop(oop* p);

    86   virtual void do_oop(narrowOop* p);

    87 };

    88 

    89 class ParScanWeakRefClosure: public ScanWeakRefClosure {

    90  protected:

    91   ParScanThreadState* _par_scan_state;

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

    93  public:

    94   ParScanWeakRefClosure(ParNewGeneration* g,

    95                         ParScanThreadState* par_scan_state);

    96   virtual void do_oop(oop* p);

    97   virtual void do_oop(narrowOop* p);

    98 };

    99 

   100 class ParEvacuateFollowersClosure: public VoidClosure {

   101  private:

   102   ParScanThreadState* _par_scan_state;

   103   ParScanThreadState* par_scan_state() { return _par_scan_state; }

   104 

   105   // We want to preserve the specific types here (rather than "OopClosure")

   106   // for later de-virtualization of do_oop calls.

   107   ParScanWithoutBarrierClosure* _to_space_closure;

   108   ParScanWithoutBarrierClosure* to_space_closure() {

   109     return _to_space_closure;

   110   }

   111   ParRootScanWithoutBarrierClosure* _to_space_root_closure;

   112   ParRootScanWithoutBarrierClosure* to_space_root_closure() {

   113     return _to_space_root_closure;

   114   }

   115 

   116   ParScanWithBarrierClosure* _old_gen_closure;

   117   ParScanWithBarrierClosure* old_gen_closure () {

   118     return _old_gen_closure;

   119   }

   120   ParRootScanWithBarrierTwoGensClosure* _old_gen_root_closure;

   121   ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure () {

   122     return _old_gen_root_closure;

   123   }

   124 

   125   ParNewGeneration* _par_gen;

   126   ParNewGeneration* par_gen() { return _par_gen; }

   127 

   128   ObjToScanQueueSet*  _task_queues;

   129   ObjToScanQueueSet*  task_queues() { return _task_queues; }

   130 

   131   ParallelTaskTerminator* _terminator;

   132   ParallelTaskTerminator* terminator() { return _terminator; }

   133  public:

   134   ParEvacuateFollowersClosure(

   135     ParScanThreadState* par_scan_state_,

   136     ParScanWithoutBarrierClosure* to_space_closure_,

   137     ParScanWithBarrierClosure* old_gen_closure_,

   138     ParRootScanWithoutBarrierClosure* to_space_root_closure_,

   139     ParNewGeneration* par_gen_,

   140     ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure_,

   141     ObjToScanQueueSet* task_queues_,

   142     ParallelTaskTerminator* terminator_);

   143   virtual void do_void();

   144 };

   145 

   146 #endif // SHARE_GC_CMS_PAROOPCLOSURES_HPP