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class Foreign; // Alias for HeapObject::IsForeign() that avoids inlining. V8_EXPORT_PRIVATE bool IsForeign_NonInline(HeapObject o); template <class D, class P> class TorqueGeneratedForeign : public P { static_assert(std::is_same<Foreign, D>::value, "Use this class as direct base for Foreign."); static_assert(std::is_same<HeapObject, P>::value, "Pass in HeapObject as second template parameter for TorqueGeneratedForeign."); public: using Super = P; using TorqueGeneratedClass = TorqueGeneratedForeign<D,P>; V8_INLINE static D cast(Object object) { return D(object.ptr()); } V8_INLINE static D unchecked_cast(Object object) { return bit_cast<D>(object); } #ifdef VERIFY_HEAP V8_EXPORT_PRIVATE void ForeignVerify(Isolate* isolate); #endif // VERIFY_HEAP static constexpr int kForeignAddressOffset = P::kHeaderSize; static constexpr int kForeignAddressOffsetEnd = kForeignAddressOffset + kExternalPointerSize - 1; static constexpr int kStartOfWeakFieldsOffset = kForeignAddressOffsetEnd + 1; static constexpr int kEndOfWeakFieldsOffset = kForeignAddressOffsetEnd + 1; static constexpr int kStartOfStrongFieldsOffset = kForeignAddressOffsetEnd + 1; static constexpr int kEndOfStrongFieldsOffset = kForeignAddressOffsetEnd + 1; static constexpr int kHeaderSize = kForeignAddressOffsetEnd + 1; static constexpr int kSize = kForeignAddressOffsetEnd + 1; V8_INLINE static constexpr int32_t SizeFor() { DCHECK(kHeaderSize == kSize && kHeaderSize == 16); int32_t size = kHeaderSize; return size; } V8_INLINE int32_t AllocatedSize() const { return SizeFor(); } friend class Factory; public: template <class DAlias = D> constexpr TorqueGeneratedForeign() : P() { static_assert(std::is_base_of<TorqueGeneratedForeign, DAlias>::value, "class TorqueGeneratedForeign should be used as direct base for Foreign."); } protected: inline explicit TorqueGeneratedForeign(Address ptr); // Special-purpose constructor for subclasses that have fast paths where // their ptr() is a Smi. inline explicit TorqueGeneratedForeign(Address ptr, HeapObject::AllowInlineSmiStorage allow_smi); };