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SWDEV-303548 - Macro for declaring VisitorPayloadOffsetProjection with useOffsetof = false #122

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SWDEV-303548 - Macro for declaring VisitorPayloadOffsetProjection with useOffsetof = false #122

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14 changes: 14 additions & 0 deletions include/llvm-dialects/Dialect/Visitor.h
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Original file line number Diff line number Diff line change
Expand Up @@ -91,6 +91,20 @@ struct VisitorPayloadProjection {
static constexpr std::size_t offset = offsetof(PayloadT, field); \
};

/// Identical to the previous macro except this one handles complex data types
///
/// offsetof() should not be used with complex types that have a non-standard
/// layout, such as classes. Here we set useOffsetof = false to avoid using
/// offsetof() on the field.
#define LLVM_DIALECTS_VISITOR_PAYLOAD_PROJECT_COMPLEX_FIELD(PayloadT, field) \
template <> \
struct llvm_dialects::detail::VisitorPayloadOffsetProjection< \
PayloadT, \
std::remove_reference_t<decltype(std::declval<PayloadT>().field)>> { \
static constexpr bool useOffsetof = false; \
static constexpr std::size_t offset = 0; \
};

/// @brief Possible result states of visitor callbacks
///
/// A visitor may have multiple callbacks registered that match on the same
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