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Apply only allowed attributes to generated functions #3784

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Apply only allowed attributes to generated functions #3784

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423c2e1
Filter attributes on bindgen/descriptor functions to safe ones.
seancribbs Jan 14, 2024
1a28c50
Add test for cfg attributes
seancribbs Jan 21, 2024
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12 changes: 10 additions & 2 deletions crates/backend/src/codegen.rs
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Expand Up @@ -678,6 +678,14 @@ impl TryToTokens for ast::Export {
};
let nargs = self.function.arguments.len() as u32;
let attrs = &self.function.rust_attrs;
let safe_attrs = attrs
.iter()
.filter(|a| {
let path = a.path();
path.is_ident("cfg") || path.is_ident("cfg_attr")
})
.cloned()
.collect::<Vec<_>>();

let start_check = if self.start {
quote! { const _ASSERT: fn() = || -> #projection::Abi { loop {} }; }
Expand All @@ -688,7 +696,7 @@ impl TryToTokens for ast::Export {
(quote! {
#[automatically_derived]
const _: () = {
#(#attrs)*
#(#safe_attrs)*
#[cfg_attr(
all(target_arch = "wasm32", not(any(target_os = "emscripten", target_os = "wasi"))),
export_name = #export_name,
Expand Down Expand Up @@ -745,7 +753,7 @@ impl TryToTokens for ast::Export {
#describe_args
#describe_ret
},
attrs: attrs.clone(),
attrs: safe_attrs,
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wasm_bindgen: &self.wasm_bindgen,
}
.to_tokens(into);
Expand Down