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src/hotspot/share/gc/shared/memAllocator.hpp

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 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_SHARED_MEMALLOCATOR_HPP
 26 #define SHARE_GC_SHARED_MEMALLOCATOR_HPP
 27 
 28 #include "memory/memRegion.hpp"
 29 #include "oops/oopsHierarchy.hpp"
 30 #include "runtime/javaThread.hpp"
 31 #include "utilities/exceptions.hpp"
 32 #include "utilities/globalDefinitions.hpp"
 33 #include "utilities/macros.hpp"
 34 
 35 // These fascilities are used for allocating, and initializing newly allocated objects.
 36 
 37 class MemAllocator: StackObj {
 38 protected:
 39   class Allocation;
 40 
 41   Thread* const        _thread;
 42   Klass* const         _klass;
 43   const size_t         _word_size;
 44 
 45   // Allocate from the current thread's TLAB, without taking a new TLAB (no safepoint).
 46  HeapWord* mem_allocate_inside_tlab_fast() const;
 47 
 48 private:
 49   // Allocate in a TLAB. Could allocate a new TLAB, and therefore potentially safepoint.
 50   HeapWord* mem_allocate_inside_tlab_slow(Allocation& allocation) const;
 51 
 52   // Allocate outside a TLAB. Could safepoint.
 53   HeapWord* mem_allocate_outside_tlab(Allocation& allocation) const;
 54 
 55 protected:

 72   // that must be parseable as an oop by concurrent collectors.
 73   oop finish(HeapWord* mem) const;
 74 
 75   // Raw memory allocation. This will try to do a TLAB allocation, and otherwise fall
 76   // back to calling CollectedHeap::mem_allocate().
 77   HeapWord* mem_allocate(Allocation& allocation) const;
 78 
 79 public:
 80   // Allocate and fully construct the object, and perform various instrumentation. Could safepoint.
 81   oop allocate() const;
 82 };
 83 
 84 class ObjAllocator: public MemAllocator {
 85 public:
 86   ObjAllocator(Klass* klass, size_t word_size, Thread* thread = Thread::current())
 87     : MemAllocator(klass, word_size, thread) {}
 88 
 89   virtual oop initialize(HeapWord* mem) const;
 90 };
 91 








 92 class ObjArrayAllocator: public MemAllocator {
 93 protected:
 94   const int  _length;
 95   const bool _do_zero;
 96 
 97   void mem_zap_start_padding(HeapWord* mem) const PRODUCT_RETURN;
 98   void mem_zap_end_padding(HeapWord* mem) const PRODUCT_RETURN;
 99 
100 public:
101   ObjArrayAllocator(Klass* klass, size_t word_size, int length, bool do_zero,
102                     Thread* thread = Thread::current())
103     : MemAllocator(klass, word_size, thread),
104       _length(length),
105       _do_zero(do_zero) {}
106 
107   virtual oop initialize(HeapWord* mem) const;
108 };
109 
110 class ClassAllocator: public MemAllocator {
111 public:

 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_SHARED_MEMALLOCATOR_HPP
 26 #define SHARE_GC_SHARED_MEMALLOCATOR_HPP
 27 
 28 #include "memory/memRegion.hpp"
 29 #include "oops/oopsHierarchy.hpp"
 30 #include "runtime/javaThread.hpp"
 31 #include "utilities/exceptions.hpp"
 32 #include "utilities/globalDefinitions.hpp"
 33 #include "utilities/macros.hpp"
 34 
 35 // These facilities are used for allocating, and initializing newly allocated objects.
 36 
 37 class MemAllocator: StackObj {
 38 protected:
 39   class Allocation;
 40 
 41   Thread* const        _thread;
 42   Klass* const         _klass;
 43   const size_t         _word_size;
 44 
 45   // Allocate from the current thread's TLAB, without taking a new TLAB (no safepoint).
 46  HeapWord* mem_allocate_inside_tlab_fast() const;
 47 
 48 private:
 49   // Allocate in a TLAB. Could allocate a new TLAB, and therefore potentially safepoint.
 50   HeapWord* mem_allocate_inside_tlab_slow(Allocation& allocation) const;
 51 
 52   // Allocate outside a TLAB. Could safepoint.
 53   HeapWord* mem_allocate_outside_tlab(Allocation& allocation) const;
 54 
 55 protected:

 72   // that must be parseable as an oop by concurrent collectors.
 73   oop finish(HeapWord* mem) const;
 74 
 75   // Raw memory allocation. This will try to do a TLAB allocation, and otherwise fall
 76   // back to calling CollectedHeap::mem_allocate().
 77   HeapWord* mem_allocate(Allocation& allocation) const;
 78 
 79 public:
 80   // Allocate and fully construct the object, and perform various instrumentation. Could safepoint.
 81   oop allocate() const;
 82 };
 83 
 84 class ObjAllocator: public MemAllocator {
 85 public:
 86   ObjAllocator(Klass* klass, size_t word_size, Thread* thread = Thread::current())
 87     : MemAllocator(klass, word_size, thread) {}
 88 
 89   virtual oop initialize(HeapWord* mem) const;
 90 };
 91 
 92 class ObjBufferAllocator: public MemAllocator {
 93 public:
 94   ObjBufferAllocator(Klass* klass, size_t word_size, Thread* thread = Thread::current())
 95     : MemAllocator(klass, word_size, thread) {}
 96   virtual oop initialize(HeapWord* mem) const;
 97 };
 98 
 99 
100 class ObjArrayAllocator: public MemAllocator {
101 protected:
102   const int  _length;
103   const bool _do_zero;
104 
105   void mem_zap_start_padding(HeapWord* mem) const PRODUCT_RETURN;
106   void mem_zap_end_padding(HeapWord* mem) const PRODUCT_RETURN;
107 
108 public:
109   ObjArrayAllocator(Klass* klass, size_t word_size, int length, bool do_zero,
110                     Thread* thread = Thread::current())
111     : MemAllocator(klass, word_size, thread),
112       _length(length),
113       _do_zero(do_zero) {}
114 
115   virtual oop initialize(HeapWord* mem) const;
116 };
117 
118 class ClassAllocator: public MemAllocator {
119 public:
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