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class FreeSpace; // Alias for HeapObject::IsFreeSpace() that avoids inlining. V8_EXPORT_PRIVATE bool IsFreeSpace_NonInline(HeapObject o); template <class D, class P> class TorqueGeneratedFreeSpace : public P { static_assert(std::is_same<FreeSpace, D>::value, "Use this class as direct base for FreeSpace."); static_assert(std::is_same<HeapObject, P>::value, "Pass in HeapObject as second template parameter for TorqueGeneratedFreeSpace."); public: using Super = P; using TorqueGeneratedClass = TorqueGeneratedFreeSpace<D,P>; inline int size() const; inline void set_size(int value); // Torque type: (Uninitialized | class FreeSpace) inline MaybeObject next() const; inline MaybeObject next(PtrComprCageBase cage_base) const; inline void set_next(MaybeObject value, WriteBarrierMode mode = UPDATE_WRITE_BARRIER); 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 FreeSpaceVerify(Isolate* isolate); #endif // VERIFY_HEAP static constexpr int kStartOfStrongFieldsOffset = P::kHeaderSize; static constexpr int kSizeOffset = P::kHeaderSize; static constexpr int kSizeOffsetEnd = kSizeOffset + kTaggedSize - 1; static constexpr int kNextOffset = kSizeOffsetEnd + 1; static constexpr int kNextOffsetEnd = kNextOffset + kTaggedSize - 1; static constexpr int kEndOfStrongFieldsOffset = kNextOffsetEnd + 1; static constexpr int kStartOfWeakFieldsOffset = kNextOffsetEnd + 1; static constexpr int kEndOfWeakFieldsOffset = kNextOffsetEnd + 1; static constexpr int kHeaderSize = kNextOffsetEnd + 1; static constexpr int kSize = kNextOffsetEnd + 1; V8_INLINE static constexpr int32_t SizeFor() { DCHECK(kHeaderSize == kSize && kHeaderSize == 24); int32_t size = kHeaderSize; return size; } V8_INLINE int32_t AllocatedSize() const { return SizeFor(); } friend class Factory; public: template <class DAlias = D> constexpr TorqueGeneratedFreeSpace() : P() { static_assert(std::is_base_of<TorqueGeneratedFreeSpace, DAlias>::value, "class TorqueGeneratedFreeSpace should be used as direct base for FreeSpace."); } protected: inline explicit TorqueGeneratedFreeSpace(Address ptr); // Special-purpose constructor for subclasses that have fast paths where // their ptr() is a Smi. inline explicit TorqueGeneratedFreeSpace(Address ptr, HeapObject::AllowInlineSmiStorage allow_smi); };