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Add support for constructing JsValue instances generically

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This commit is contained in:
David Flemström
2018-03-28 01:22:31 +02:00
committed by Alex Crichton
parent e6a483f906
commit 73619b5d15
5 changed files with 86 additions and 4 deletions
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16
crates/backend/src/codegen.rs
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@ -88,6 +88,7 @@ impl ToTokens for ast::Program {
impl ToTokens for ast::Struct {
fn to_tokens(&self, tokens: &mut Tokens) {
let name = &self.name;
let new_fn = syn::Ident::from(shared::new_function(self.name.as_ref()));
let free_fn = syn::Ident::from(shared::free_function(self.name.as_ref()));
let c = shared::name_to_descriptor(name.as_ref());
let descriptor = Literal::byte_string(format!("{:4}", c).as_bytes());
@ -153,6 +154,21 @@ impl ToTokens for ast::Struct {
}
}
impl ::std::convert::From<#name> for ::wasm_bindgen::JsValue {
fn from(value: #name) -> Self {
let ptr = ::wasm_bindgen::convert::WasmBoundary::into_js(value);
#[wasm_import_module = "__wbindgen_placeholder__"]
extern {
fn #new_fn(ptr: u32) -> u32;
}
unsafe {
::wasm_bindgen::JsValue::__from_idx(#new_fn(ptr))
}
}
}
#[no_mangle]
pub unsafe extern fn #free_fn(ptr: u32) {
<#name as ::wasm_bindgen::convert::WasmBoundary>::from_abi(