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Make an UnsafeExternCFn struct to overcome fn pointer hrtb

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lumi
2025-06-23 17:40:18 +10:00
parent c39106b790
commit 2352ba66d4
3 changed files with 138 additions and 154 deletions
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6
crates/luaffi_impl/src/metatype.rs
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@@ -67,7 +67,7 @@ fn generate_impls(imp: &mut ItemImpl) -> Result<TokenStream> {
let ffi_register_drop = quote! {
if ::std::mem::needs_drop::<Self>() {
b.declare::<unsafe extern "C" fn(*mut Self)>(#ffi_drop_cname);
b.declare::<#ffi::UnsafeExternCFn<(*mut Self,), ()>>(#ffi_drop_cname);
b.metatable_raw("gc", ::std::format_args!("__C.{}", #ffi_drop_cname));
}
};
@@ -280,9 +280,9 @@ fn generate_ffi_register(func: &FfiFunction) -> Result<TokenStream> {
};
let declare = if func.ret_by_out {
quote! { b.declare::<unsafe extern "C" fn(*mut #ret, #(#params),*)>(#c_name); }
quote! { b.declare::<#ffi::UnsafeExternCFn<(*mut #ret, #(#params,)*), ()>>(#c_name); }
} else {
quote! { b.declare::<unsafe extern "C" fn(#(#params),*) -> #ret>(#c_name); }
quote! { b.declare::<#ffi::UnsafeExternCFn<(#(#params,)*), #ret>>(#c_name); }
};
let register = match func.attrs.metatable {