711 protected:
712 NOT_PRODUCT(int _nesting;)
713
714 public:
715 ReallocMark() PRODUCT_RETURN;
716 void check() PRODUCT_RETURN;
717 };
718
719 // Helper class to allocate arrays that may become large.
720 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
721 // and uses mapped memory for larger allocations.
722 // Most OS mallocs do something similar but Solaris malloc does not revert
723 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
724 // is set so that we always use malloc except for Solaris where we set the
725 // limit to get mapped memory.
726 template <class E, MEMFLAGS F>
727 class ArrayAllocator : public AllStatic {
728 private:
729 static bool should_use_malloc(size_t length);
730
731 static size_t size_for_malloc(size_t length);
732 static size_t size_for_mmap(size_t length);
733
734 static E* allocate_malloc(size_t length);
735 static E* allocate_mmap(size_t length);
736
737 static void free_malloc(E* addr, size_t length);
738 static void free_mmap(E* addr, size_t length);
739
740 public:
741 static E* allocate(size_t length);
742 static E* reallocate(E* old_addr, size_t old_length, size_t new_length);
743 static void free(E* addr, size_t length);
744 };
745
746 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP
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711 protected:
712 NOT_PRODUCT(int _nesting;)
713
714 public:
715 ReallocMark() PRODUCT_RETURN;
716 void check() PRODUCT_RETURN;
717 };
718
719 // Helper class to allocate arrays that may become large.
720 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit
721 // and uses mapped memory for larger allocations.
722 // Most OS mallocs do something similar but Solaris malloc does not revert
723 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit
724 // is set so that we always use malloc except for Solaris where we set the
725 // limit to get mapped memory.
726 template <class E, MEMFLAGS F>
727 class ArrayAllocator : public AllStatic {
728 private:
729 static bool should_use_malloc(size_t length);
730
731 static E* allocate_malloc(size_t length);
732 static E* allocate_mmap(size_t length);
733
734 static void free_malloc(E* addr, size_t length);
735 static void free_mmap(E* addr, size_t length);
736
737 public:
738 static E* allocate(size_t length);
739 static E* reallocate(E* old_addr, size_t old_length, size_t new_length);
740 static void free(E* addr, size_t length);
741 };
742
743 // Uses mmaped memory for all allocations. All allocations are initially
744 // zero-filled. No pre-touching.
745 template <class E, MEMFLAGS F>
746 class MmapArrayAllocator : public AllStatic {
747 private:
748 static size_t size_for(size_t length);
749
750 public:
751 static E* allocate(size_t length);
752 static void free(E* addr, size_t length);
753 };
754
755 // Uses malloc:ed memory for all allocations.
756 template <class E, MEMFLAGS F>
757 class MallocArrayAllocator : public AllStatic {
758 public:
759 static size_t size_for(size_t length);
760
761 static E* allocate(size_t length);
762 static void free(E* addr, size_t length);
763 };
764
765 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP
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