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33 lines
1.0 KiB
C++
33 lines
1.0 KiB
C++
#pragma once
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#include <cstdint>
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namespace lsplant::art {
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template <bool kPoisonReferences, class MirrorType>
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class alignas(4) [[gnu::packed]] ObjectReference {
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static MirrorType* Decompress(uint32_t ref) {
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uintptr_t as_bits = kPoisonReferences ? -ref : ref;
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return reinterpret_cast<MirrorType*>(as_bits);
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}
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uint32_t reference_;
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public:
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MirrorType* AsMirrorPtr() const { return Decompress(reference_); }
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};
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template <class MirrorType>
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class alignas(4) [[gnu::packed]] CompressedReference : public ObjectReference<false, MirrorType> {};
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template <class MirrorType>
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class alignas(4) [[gnu::packed]] StackReference : public CompressedReference<MirrorType> {};
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template <typename To, typename From> // use like this: down_cast<T*>(foo);
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inline To down_cast(From* f) { // so we only accept pointers
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static_assert(std::is_base_of_v<From, std::remove_pointer_t<To>>,
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"down_cast unsafe as To is not a subtype of From");
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return static_cast<To>(f);
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}
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} // namespace lsplant::art
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