jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp@1fdb98a17101

6716785: implicit null checks not triggering with CompressedOops
Summary: allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check
Reviewed-by: kvn, jmasa, phh, jcoomes

     1 /*

     2  * Copyright 2002-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // Forward declarations of classes defined here.

    26 class GCTaskThread;

    27 class GCTaskTimeStamp;

    29 // Declarations of classes referenced in this file via pointer.

    30 class GCTaskManager;

    32 class GCTaskThread : public WorkerThread {

    33 private:

    34   // Instance state.

    35   GCTaskManager* _manager;              // Manager for worker.

    36   const uint     _processor_id;         // Which processor the worker is on.

    38   GCTaskTimeStamp* _time_stamps;

    39   uint _time_stamp_index;

    41   GCTaskTimeStamp* time_stamp_at(uint index);

    43  public:

    44   // Factory create and destroy methods.

    45   static GCTaskThread* create(GCTaskManager* manager,

    46                               uint           which,

    47                               uint           processor_id) {

    48     return new GCTaskThread(manager, which, processor_id);

    49   }

    50   static void destroy(GCTaskThread* manager) {

    51     if (manager != NULL) {

    52       delete manager;

    53     }

    54   }

    55   // Methods from Thread.

    56   bool is_GC_task_thread() const {

    57     return true;

    58   }

    59   virtual void run();

    60   // Methods.

    61   void start();

    63   void print_task_time_stamps();

    64   void print_on(outputStream* st) const;

    65   void print() const                                { print_on(tty); }

    67 protected:

    68   // Constructor.  Clients use factory, but there could be subclasses.

    69   GCTaskThread(GCTaskManager* manager, uint which, uint processor_id);

    70   // Destructor: virtual destructor because of virtual methods.

    71   virtual ~GCTaskThread();

    72   // Accessors.

    73   GCTaskManager* manager() const {

    74     return _manager;

    75   }

    76   uint which() const {

    77     return id();

    78   }

    79   uint processor_id() const {

    80     return _processor_id;

    81   }

    82 };

    84 class GCTaskTimeStamp : public CHeapObj

    85 {

    86  private:

    87   jlong  _entry_time;

    88   jlong  _exit_time;

    89   char*  _name;

    91  public:

    92   jlong entry_time()              { return _entry_time; }

    93   jlong exit_time()               { return _exit_time; }

    94   const char* name() const        { return (const char*)_name; }

    96   void set_entry_time(jlong time) { _entry_time = time; }

    97   void set_exit_time(jlong time)  { _exit_time = time; }

    98   void set_name(char* name)       { _name = name; }

    99 };

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

src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp@1fdb98a17101

src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp