< prev index next >

src/share/vm/gc/shared/preservedMarks.hpp

Print this page




  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_VM_GC_SHARED_PRESERVEDMARKS_HPP
  26 #define SHARE_VM_GC_SHARED_PRESERVEDMARKS_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "memory/padded.hpp"
  30 #include "oops/oop.hpp"
  31 #include "utilities/stack.hpp"
  32 

  33 class GCTaskManager;

  34 class WorkGang;
  35 
  36 class PreservedMarks VALUE_OBJ_CLASS_SPEC {
  37 private:
  38   class OopAndMarkOop {
  39   private:
  40     oop _o;
  41     markOop _m;
  42 
  43   public:
  44     OopAndMarkOop(oop obj, markOop m) : _o(obj), _m(m) { }
  45 
  46     void set_mark() const {
  47       _o->set_mark(_m);
  48     }
  49   };
  50   typedef Stack<OopAndMarkOop, mtGC> OopAndMarkOopStack;
  51 
  52   OopAndMarkOopStack _stack;
  53 


  77 
  78 class PreservedMarksSet : public CHeapObj<mtGC> {
  79 private:
  80   // true -> _stacks will be allocated in the C heap
  81   // false -> _stacks will be allocated in the resource arena
  82   const bool _in_c_heap;
  83 
  84   // Number of stacks we have allocated (typically, one stack per GC worker).
  85   // This should be >= 1 if the stacks have been initialized,
  86   // or == 0 if they have not.
  87   uint _num;
  88 
  89   // Stack array (typically, one stack per GC worker) of length _num.
  90   // This should be != NULL if the stacks have been initialized,
  91   // or == NULL if they have not.
  92   Padded<PreservedMarks>* _stacks;
  93 
  94   // Internal version of restore() that uses a WorkGang for parallelism.
  95   void restore_internal(WorkGang* workers, volatile size_t* total_size_addr);
  96 

  97   // Internal version of restore() that uses a GCTaskManager for parallelism.
  98   void restore_internal(GCTaskManager* gc_task_manager,
  99                         volatile size_t* total_size_addr);

 100 
 101 public:
 102   uint num() const { return _num; }
 103 
 104   // Return the i'th stack.
 105   PreservedMarks* get(uint i = 0) const {
 106     assert(_num > 0 && _stacks != NULL, "stacks should have been initialized");
 107     assert(i < _num, "pre-condition");
 108     return (_stacks + i);
 109   }
 110 
 111   // Allocate stack array.
 112   void init(uint num);
 113 
 114   // Itrerate over all stacks, restore all presered marks, and reclaim
 115   // the memory taken up by the stack segments. If the executor is
 116   // NULL, restoration will be done serially. If the executor is not
 117   // NULL, restoration could be done in parallel (when it makes
 118   // sense). Supported executors: WorkGang (Serial, CMS, G1),
 119   // GCTaskManager (PS).


  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_VM_GC_SHARED_PRESERVEDMARKS_HPP
  26 #define SHARE_VM_GC_SHARED_PRESERVEDMARKS_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "memory/padded.hpp"
  30 #include "oops/oop.hpp"
  31 #include "utilities/stack.hpp"
  32 
  33 #if INCLUDE_ALL_GCS
  34 class GCTaskManager;
  35 #endif
  36 class WorkGang;
  37 
  38 class PreservedMarks VALUE_OBJ_CLASS_SPEC {
  39 private:
  40   class OopAndMarkOop {
  41   private:
  42     oop _o;
  43     markOop _m;
  44 
  45   public:
  46     OopAndMarkOop(oop obj, markOop m) : _o(obj), _m(m) { }
  47 
  48     void set_mark() const {
  49       _o->set_mark(_m);
  50     }
  51   };
  52   typedef Stack<OopAndMarkOop, mtGC> OopAndMarkOopStack;
  53 
  54   OopAndMarkOopStack _stack;
  55 


  79 
  80 class PreservedMarksSet : public CHeapObj<mtGC> {
  81 private:
  82   // true -> _stacks will be allocated in the C heap
  83   // false -> _stacks will be allocated in the resource arena
  84   const bool _in_c_heap;
  85 
  86   // Number of stacks we have allocated (typically, one stack per GC worker).
  87   // This should be >= 1 if the stacks have been initialized,
  88   // or == 0 if they have not.
  89   uint _num;
  90 
  91   // Stack array (typically, one stack per GC worker) of length _num.
  92   // This should be != NULL if the stacks have been initialized,
  93   // or == NULL if they have not.
  94   Padded<PreservedMarks>* _stacks;
  95 
  96   // Internal version of restore() that uses a WorkGang for parallelism.
  97   void restore_internal(WorkGang* workers, volatile size_t* total_size_addr);
  98 
  99   #if INCLUDE_ALL_GCS
 100   // Internal version of restore() that uses a GCTaskManager for parallelism.
 101   void restore_internal(GCTaskManager* gc_task_manager,
 102                         volatile size_t* total_size_addr);
 103   #endif
 104 
 105 public:
 106   uint num() const { return _num; }
 107 
 108   // Return the i'th stack.
 109   PreservedMarks* get(uint i = 0) const {
 110     assert(_num > 0 && _stacks != NULL, "stacks should have been initialized");
 111     assert(i < _num, "pre-condition");
 112     return (_stacks + i);
 113   }
 114 
 115   // Allocate stack array.
 116   void init(uint num);
 117 
 118   // Itrerate over all stacks, restore all presered marks, and reclaim
 119   // the memory taken up by the stack segments. If the executor is
 120   // NULL, restoration will be done serially. If the executor is not
 121   // NULL, restoration could be done in parallel (when it makes
 122   // sense). Supported executors: WorkGang (Serial, CMS, G1),
 123   // GCTaskManager (PS).
< prev index next >