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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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#ifndef SHARE_VM_RUNTIME_ACCESSBACKEND_INLINE_HPP

#define SHARE_VM_RUNTIME_ACCESSBACKEND_INLINE_HPP

#include "oops/access.hpp"

#include "oops/accessBackend.hpp"

#include "oops/oop.inline.hpp"

template <DecoratorSet decorators>

template <DecoratorSet idecorators, typename T>

inline typename EnableIf<

  AccessInternal::MustConvertCompressedOop<idecorators, T>::value, T>::type

RawAccessBarrier<decorators>::decode_internal(typename HeapOopType<idecorators>::type value) {

  if (HasDecorator<decorators, OOP_NOT_NULL>::value) {

    return oopDesc::decode_heap_oop_not_null(value);

  } else {

    return oopDesc::decode_heap_oop(value);

  }

}

template <DecoratorSet decorators>

template <DecoratorSet idecorators, typename T>

inline typename EnableIf<

  AccessInternal::MustConvertCompressedOop<idecorators, T>::value,

  typename HeapOopType<idecorators>::type>::type

RawAccessBarrier<decorators>::encode_internal(T value) {

  if (HasDecorator<decorators, OOP_NOT_NULL>::value) {

    return oopDesc::encode_heap_oop_not_null(value);

  } else {

    return oopDesc::encode_heap_oop(value);

  }

}

template <DecoratorSet decorators>

template <typename T>

inline void RawAccessBarrier<decorators>::oop_store(void* addr, T value) {

  typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;

  Encoded encoded = encode(value);

  store(reinterpret_cast<Encoded*>(addr), encoded);

}

template <DecoratorSet decorators>

template <typename T>

inline void RawAccessBarrier<decorators>::oop_store_at(oop base, ptrdiff_t offset, T value) {

  oop_store(field_addr(base, offset), value);

}

template <DecoratorSet decorators>

template <typename T>

inline T RawAccessBarrier<decorators>::oop_load(void* addr) {

  typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;

  Encoded encoded = load<Encoded>(reinterpret_cast<Encoded*>(addr));

  return decode<T>(encoded);

}

template <DecoratorSet decorators>

template <typename T>

inline T RawAccessBarrier<decorators>::oop_load_at(oop base, ptrdiff_t offset) {

  return oop_load<T>(field_addr(base, offset));

}

template <DecoratorSet decorators>

template <typename T>

inline T RawAccessBarrier<decorators>::oop_atomic_cmpxchg(T new_value, void* addr, T compare_value) {

  typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;

  Encoded encoded_new = encode(new_value);

  Encoded encoded_compare = encode(compare_value);

  Encoded encoded_result = atomic_cmpxchg(encoded_new,

                                          reinterpret_cast<Encoded*>(addr),

                                          encoded_compare);

  return decode<T>(encoded_result);

}

template <DecoratorSet decorators>

template <typename T>

inline T RawAccessBarrier<decorators>::oop_atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {

  return oop_atomic_cmpxchg(new_value, field_addr(base, offset), compare_value);

}

template <DecoratorSet decorators>

template <typename T>

inline T RawAccessBarrier<decorators>::oop_atomic_xchg(T new_value, void* addr) {

  typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;

  Encoded encoded_new = encode(new_value);

  Encoded encoded_result = atomic_xchg(encoded_new, reinterpret_cast<Encoded*>(addr));

  return decode<T>(encoded_result);

}

template <DecoratorSet decorators>

template <typename T>

inline T RawAccessBarrier<decorators>::oop_atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {

  return oop_atomic_xchg(new_value, field_addr(base, offset));

}

template <DecoratorSet decorators>

template <typename T>

inline bool RawAccessBarrier<decorators>::oop_arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {

  return arraycopy(src_obj, dst_obj, src, dst, length);

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_SEQ_CST>::value, T>::type

RawAccessBarrier<decorators>::load_internal(void* addr) {

  if (support_IRIW_for_not_multiple_copy_atomic_cpu) {

    OrderAccess::fence();

  }

  return OrderAccess::load_acquire(reinterpret_cast<const volatile T*>(addr));

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_ACQUIRE>::value, T>::type

RawAccessBarrier<decorators>::load_internal(void* addr) {

  return OrderAccess::load_acquire(reinterpret_cast<const volatile T*>(addr));

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_RELAXED>::value, T>::type

RawAccessBarrier<decorators>::load_internal(void* addr) {

  return Atomic::load(reinterpret_cast<const volatile T*>(addr));

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_SEQ_CST>::value>::type

RawAccessBarrier<decorators>::store_internal(void* addr, T value) {

  OrderAccess::release_store_fence(reinterpret_cast<volatile T*>(addr), value);

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_RELEASE>::value>::type

RawAccessBarrier<decorators>::store_internal(void* addr, T value) {

  OrderAccess::release_store(reinterpret_cast<volatile T*>(addr), value);

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_RELAXED>::value>::type

RawAccessBarrier<decorators>::store_internal(void* addr, T value) {

  Atomic::store(value, reinterpret_cast<volatile T*>(addr));

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_RELAXED>::value, T>::type

RawAccessBarrier<decorators>::atomic_cmpxchg_internal(T new_value, void* addr, T compare_value) {

  return Atomic::cmpxchg(new_value,

                         reinterpret_cast<volatile T*>(addr),

                         compare_value,

                         memory_order_relaxed);

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_SEQ_CST>::value, T>::type

RawAccessBarrier<decorators>::atomic_cmpxchg_internal(T new_value, void* addr, T compare_value) {

  return Atomic::cmpxchg(new_value,

                         reinterpret_cast<volatile T*>(addr),

                         compare_value,

                         memory_order_conservative);

}

template <DecoratorSet decorators>

template <DecoratorSet ds, typename T>

inline typename EnableIf<

  HasDecorator<ds, MO_SEQ_CST>::value, T>::type

RawAccessBarrier<decorators>::atomic_xchg_internal(T new_value, void* addr) {

  return Atomic::xchg(new_value,

                      reinterpret_cast<volatile T*>(addr));

}

// For platforms that do not have native support for wide atomics,

// we can emulate the atomicity using a lock. So here we check

// whether that is necessary or not.

template <DecoratorSet ds>

template <DecoratorSet decorators, typename T>

inline typename EnableIf<

  AccessInternal::PossiblyLockedAccess<T>::value, T>::type

RawAccessBarrier<ds>::atomic_xchg_maybe_locked(T new_value, void* addr) {

  if (!AccessInternal::wide_atomic_needs_locking()) {

    return atomic_xchg_internal<ds>(new_value, addr);

  } else {

    AccessInternal::AccessLocker access_lock;

    volatile T* p = reinterpret_cast<volatile T*>(addr);

    T old_val = RawAccess<>::load(p);

    RawAccess<>::store(p, new_value);

    return old_val;

  }

}

template <DecoratorSet ds>

template <DecoratorSet decorators, typename T>

inline typename EnableIf<

  AccessInternal::PossiblyLockedAccess<T>::value, T>::type

RawAccessBarrier<ds>::atomic_cmpxchg_maybe_locked(T new_value, void* addr, T compare_value) {

  if (!AccessInternal::wide_atomic_needs_locking()) {

    return atomic_cmpxchg_internal<ds>(new_value, addr, compare_value);

  } else {

    AccessInternal::AccessLocker access_lock;

    volatile T* p = reinterpret_cast<volatile T*>(addr);

    T old_val = RawAccess<>::load(p);

    if (old_val == compare_value) {

      RawAccess<>::store(p, new_value);

    }

    return old_val;

  }

}

class RawAccessBarrierArrayCopy: public AllStatic {

public:

  template <DecoratorSet decorators, typename T>

  static inline typename EnableIf<

  HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value>::type

  arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {

    // We do not check for ARRAYCOPY_ATOMIC for oops, because they are unconditionally always atomic.

    if (HasDecorator<decorators, ARRAYCOPY_ARRAYOF>::value) {

      AccessInternal::arraycopy_arrayof_conjoint_oops(src, dst, length);

    } else {

      typedef typename HeapOopType<decorators>::type OopType;

      AccessInternal::arraycopy_conjoint_oops(reinterpret_cast<OopType*>(src),

                                              reinterpret_cast<OopType*>(dst), length);

    }

  }

  template <DecoratorSet decorators, typename T>

  static inline typename EnableIf<

    !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value>::type

  arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {

    if (HasDecorator<decorators, ARRAYCOPY_ARRAYOF>::value) {

      AccessInternal::arraycopy_arrayof_conjoint(src, dst, length);

    } else if (HasDecorator<decorators, ARRAYCOPY_DISJOINT>::value && sizeof(T) == HeapWordSize) {

      // There is only a disjoint optimization for word granularity copying

      if (HasDecorator<decorators, ARRAYCOPY_ATOMIC>::value) {

        AccessInternal::arraycopy_disjoint_words_atomic(src, dst, length);

      } else {

        AccessInternal::arraycopy_disjoint_words(src, dst, length);

      }

    } else {

      if (HasDecorator<decorators, ARRAYCOPY_ATOMIC>::value) {

        AccessInternal::arraycopy_conjoint_atomic(src, dst, length);

      } else {

        AccessInternal::arraycopy_conjoint(src, dst, length);

      }

    }

  }

  template <DecoratorSet decorators>

  static inline typename EnableIf<

    !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value>::type

  arraycopy(arrayOop src_obj, arrayOop dst_obj, void* src, void* dst, size_t length) {

    if (HasDecorator<decorators, ARRAYCOPY_ATOMIC>::value) {

      AccessInternal::arraycopy_conjoint_atomic(src, dst, length);

    } else {

      AccessInternal::arraycopy_conjoint(src, dst, length);

    }

  }

};

template <DecoratorSet decorators>

template <typename T>

inline bool RawAccessBarrier<decorators>::arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {

  RawAccessBarrierArrayCopy::arraycopy<decorators>(src_obj, dst_obj, src, dst, length);

  return true;

}

template <DecoratorSet decorators>

inline void RawAccessBarrier<decorators>::clone(oop src, oop dst, size_t size) {

  // 4839641 (4840070): We must do an oop-atomic copy, because if another thread

  // is modifying a reference field in the clonee, a non-oop-atomic copy might

  // be suspended in the middle of copying the pointer and end up with parts

  // of two different pointers in the field.  Subsequent dereferences will crash.

  // 4846409: an oop-copy of objects with long or double fields or arrays of same

  // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead

  // of oops.  We know objects are aligned on a minimum of an jlong boundary.

  // The same is true of StubRoutines::object_copy and the various oop_copy

  // variants, and of the code generated by the inline_native_clone intrinsic.

  assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");

  AccessInternal::arraycopy_conjoint_atomic(reinterpret_cast<jlong*>((oopDesc*)src),

                                            reinterpret_cast<jlong*>((oopDesc*)dst),

                                            align_object_size(size) / HeapWordsPerLong);

  // Clear the header

  dst->init_mark();

}

#endif // SHARE_VM_RUNTIME_ACCESSBACKEND_INLINE_HPP