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AK: Accomodate always-32-bit data member pointers in IntrusiveList
This only exists on windows, but we've made an effort to keep jakt working on windows, so let's support this silliness.
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sideshowbarker
2024-07-17 17:49:11 +09:00
Author: https://github.com/alimpfard Commit: https://github.com/SerenityOS/serenity/commit/2306219ef9 Pull-request: https://github.com/SerenityOS/serenity/pull/18586
@ -375,13 +375,20 @@ inline typename IntrusiveList<T, Container, member>::ConstIterator IntrusiveList
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template<class T, typename Container, SubstitutedIntrusiveListNode<T, Container> T::*member>
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inline T* IntrusiveList<T, Container, member>::node_to_value(SubstitutedIntrusiveListNode<T, Container>& node)
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{
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// Note: A data member pointer is a 32-bit offset in the Windows ABI (both x86 and x86_64),
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// whereas it is an appropriately sized ptrdiff_t in the Itanium ABI, the following ensures
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// that we always use the correct type for the subtraction.
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using EquivalentNumericTypeForDataMemberPointer = Conditional<sizeof(member) == sizeof(ptrdiff_t), ptrdiff_t, u32>;
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static_assert(sizeof(EquivalentNumericTypeForDataMemberPointer) == sizeof(member),
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"The equivalent numeric type for the data member pointer must have the same size as the data member pointer itself.");
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// Note: Since this might seem odd, here's an explanation on what this function actually does:
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// `node` is a reference that resides in some part of the actual value (of type T), the
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// placement (i.e. offset) of which is described by the pointer-to-data-member parameter
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// named `member`.
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// This function effectively takes in the address of the data member, and returns the address
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// of the value (of type T) holding that member.
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return bit_cast<T*>(bit_cast<unsigned char*>(&node) - bit_cast<unsigned char*>(member));
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return bit_cast<T*>(bit_cast<unsigned char*>(&node) - bit_cast<EquivalentNumericTypeForDataMemberPointer>(member));
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}
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template<typename T, typename Container>
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