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:

 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: