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refactor(ast): make AST structs repr(C). #4614

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Aug 3, 2024
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refactor(ast): make AST structs repr(C). #4614

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6 changes: 3 additions & 3 deletions crates/oxc_ast_macros/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,10 @@ fn enum_repr(enum_: &syn::ItemEnum) -> TokenStream2 {
/// It is also a lightweight macro; All of its computation is cached and
/// it only applies the following changes without any complex operation:
///
/// * Prepend `#[repr(C)]` to structs
/// * Prepend `#[repr(C, u8)]` to fieldful enums e.g. `enum E { X: u32, Y: u8 }`
/// * Prepend `#[repr(u8)]` to unit (fieldless) enums e.g. `enum E { X, Y, Z, }`
/// * Prepend `#[derive(oxc_ast_macros::Ast)]`
/// * Prepend `#[derive(oxc_ast_macros::Ast)]` to all structs and enums
///
#[proc_macro_attribute]
#[allow(clippy::missing_panics_doc)]
Expand All @@ -28,8 +29,7 @@ pub fn ast(_args: TokenStream, input: TokenStream) -> TokenStream {

let repr = match input {
syn::Item::Enum(ref enum_) => enum_repr(enum_),
// In future, we'll add `#[repr(C)]` to structs, but at present this is disabled
syn::Item::Struct(_) => TokenStream2::default(),
syn::Item::Struct(_) => quote!(#[repr(C)]),

_ => {
unreachable!()
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