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src/hotspot/share/gc/g1/g1BarrierSet.hpp

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  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_G1_G1BARRIERSET_HPP
 26 #define SHARE_GC_G1_G1BARRIERSET_HPP
 27 

 28 #include "gc/g1/g1SATBMarkQueueSet.hpp"
 29 #include "gc/shared/bufferNode.hpp"
 30 #include "gc/shared/cardTable.hpp"
 31 #include "gc/shared/cardTableBarrierSet.hpp"
 32 
 33 class G1CardTable;
 34 class Thread;
 35 
 36 // This barrier set is specialized to manage two card tables:
 37 // * one the mutator is currently working on ("card table")
 38 // * one the refinement threads or GC during pause are working on ("refinement table")
 39 //
 40 // The card table acts like a regular card table where the mutator dirties cards
 41 // containing potentially interesting references.
 42 //
 43 // When the amount of dirty cards on the card table exceeds a threshold, G1 swaps
 44 // the card tables and has the refinement threads reduce them by "refining"
 45 // them.
 46 // I.e. refinement looks at all dirty cards on the refinement table, and updates
 47 // the remembered sets accordingly, clearing the cards on the refinement table.

104   template <DecoratorSet decorators, typename T>
105   void write_ref_field_pre(T* field);
106 
107   inline void write_region(MemRegion mr);
108   void write_region(JavaThread* thread, MemRegion mr);
109 
110   template <DecoratorSet decorators = DECORATORS_NONE, typename T>
111   void write_ref_field_post(T* field);
112 
113   virtual void on_thread_create(Thread* thread);
114   virtual void on_thread_destroy(Thread* thread);
115   virtual void on_thread_attach(Thread* thread);
116   virtual void on_thread_detach(Thread* thread);
117 
118   static G1SATBMarkQueueSet& satb_mark_queue_set() {
119     return g1_barrier_set()->_satb_mark_queue_set;
120   }
121 
122   virtual void print_on(outputStream* st) const;
123 


124   // Callbacks for runtime accesses.
125   template <DecoratorSet decorators, typename BarrierSetT = G1BarrierSet>
126   class AccessBarrier: public ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> {
127     typedef ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> ModRef;
128     typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
129 
130   public:
131     // Needed for loads on non-heap weak references
132     template <typename T>
133     static oop oop_load_not_in_heap(T* addr);
134 
135     // Needed for non-heap stores
136     template <typename T>
137     static void oop_store_not_in_heap(T* addr, oop new_value);
138 
139     // Needed for weak references
140     static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);
141 
142     // Defensive: will catch weak oops at addresses in heap
143     template <typename T>

  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_G1_G1BARRIERSET_HPP
 26 #define SHARE_GC_G1_G1BARRIERSET_HPP
 27 
 28 #include "gc/g1/g1HeapRegion.hpp"
 29 #include "gc/g1/g1SATBMarkQueueSet.hpp"
 30 #include "gc/shared/bufferNode.hpp"
 31 #include "gc/shared/cardTable.hpp"
 32 #include "gc/shared/cardTableBarrierSet.hpp"
 33 
 34 class G1CardTable;
 35 class Thread;
 36 
 37 // This barrier set is specialized to manage two card tables:
 38 // * one the mutator is currently working on ("card table")
 39 // * one the refinement threads or GC during pause are working on ("refinement table")
 40 //
 41 // The card table acts like a regular card table where the mutator dirties cards
 42 // containing potentially interesting references.
 43 //
 44 // When the amount of dirty cards on the card table exceeds a threshold, G1 swaps
 45 // the card tables and has the refinement threads reduce them by "refining"
 46 // them.
 47 // I.e. refinement looks at all dirty cards on the refinement table, and updates
 48 // the remembered sets accordingly, clearing the cards on the refinement table.

105   template <DecoratorSet decorators, typename T>
106   void write_ref_field_pre(T* field);
107 
108   inline void write_region(MemRegion mr);
109   void write_region(JavaThread* thread, MemRegion mr);
110 
111   template <DecoratorSet decorators = DECORATORS_NONE, typename T>
112   void write_ref_field_post(T* field);
113 
114   virtual void on_thread_create(Thread* thread);
115   virtual void on_thread_destroy(Thread* thread);
116   virtual void on_thread_attach(Thread* thread);
117   virtual void on_thread_detach(Thread* thread);
118 
119   static G1SATBMarkQueueSet& satb_mark_queue_set() {
120     return g1_barrier_set()->_satb_mark_queue_set;
121   }
122 
123   virtual void print_on(outputStream* st) const;
124 
125   virtual uint grain_shift() { return G1HeapRegion::LogOfHRGrainBytes; }
126 
127   // Callbacks for runtime accesses.
128   template <DecoratorSet decorators, typename BarrierSetT = G1BarrierSet>
129   class AccessBarrier: public ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> {
130     typedef ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> ModRef;
131     typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
132 
133   public:
134     // Needed for loads on non-heap weak references
135     template <typename T>
136     static oop oop_load_not_in_heap(T* addr);
137 
138     // Needed for non-heap stores
139     template <typename T>
140     static void oop_store_not_in_heap(T* addr, oop new_value);
141 
142     // Needed for weak references
143     static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);
144 
145     // Defensive: will catch weak oops at addresses in heap
146     template <typename T>
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