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Implement optionally catching exceptions

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This commit is contained in:
Alex Crichton
2018-02-06 19:04:12 -08:00
parent 43ee52bcbf
commit e9d612a343
7 changed files with 313 additions and 71 deletions
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30
crates/wasm-bindgen-macro/src/lib.rs
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@ -366,12 +366,12 @@ fn bindgen_imported_struct(import: &ast::ImportStruct, tokens: &mut Tokens) {
let mut methods = Tokens::new();
for &(_, ref f) in import.functions.iter() {
for f in import.functions.iter() {
let import_name = shared::mangled_import_name(
Some(&import.name.to_string()),
f.wasm_function.name.as_ref(),
f.function.wasm_function.name.as_ref(),
);
bindgen_import_function(f, &import_name, &mut methods);
bindgen_import_function(&f.function, &import_name, &mut methods);
}
(my_quote! {
@ -501,7 +501,7 @@ fn bindgen_import_function(import: &ast::ImportFunction,
}
}
let abi_ret;
let convert_ret;
let mut convert_ret;
match import.wasm_function.ret {
Some(ast::Type::ByValue(ref t)) => {
abi_ret = my_quote! {
@ -534,10 +534,29 @@ fn bindgen_import_function(import: &ast::ImportFunction,
Some(ast::Type::ByMutRef(_)) => panic!("can't return a borrowed ref"),
None => {
abi_ret = my_quote! { () };
convert_ret = my_quote! {};
convert_ret = my_quote! { () };
}
}
let mut exceptional_ret = my_quote! {};
if import.catch {
let exn_data = syn::Ident::from("exn_data");
let exn_data_ptr = syn::Ident::from("exn_data_ptr");
abi_argument_names.push(exn_data_ptr);
abi_arguments.push(my_quote! { #exn_data_ptr: *mut u32 });
arg_conversions.push(my_quote! {
let mut #exn_data = [0; 2];
let mut #exn_data_ptr = #exn_data.as_mut_ptr();
});
convert_ret = my_quote! { Ok(#convert_ret) };
exceptional_ret = my_quote! {
if #exn_data[0] == 1 {
return Err(<::wasm_bindgen::JsValue as
::wasm_bindgen::convert::WasmBoundary>::from_js(#exn_data[1]))
}
};
}
let name = import.ident;
let import_name = syn::Ident::from(import_name);
(quote! {
@ -548,6 +567,7 @@ fn bindgen_import_function(import: &ast::ImportFunction,
unsafe {
#(#arg_conversions)*
let #ret_ident = #import_name(#(#abi_argument_names),*);
#exceptional_ret
#convert_ret
}
}