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Code Issues Packages 1 Wiki Activity

perf(ops): inline String args (#15681)

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Divy Srivastava 2022-08-30 14:31:14 +05:30 committed by GitHub
parent 5e0fa5dd88
commit 448654764f
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1 changed files with 30 additions and 2 deletions
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32
ops/lib.rs
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@ -592,14 +592,34 @@ fn codegen_arg(
idx: usize,
) -> TokenStream2 {
let ident = quote::format_ident!("{name}");
let pat = match arg {
syn::FnArg::Typed(pat) => &pat.pat,
let (pat, ty) = match arg {
syn::FnArg::Typed(pat) => (&pat.pat, &pat.ty),
_ => unreachable!(),
};
// Fast path if arg should be skipped
if matches!(**pat, syn::Pat::Wild(_)) {
return quote! { let #ident = (); };
}
// Fast path for `String`
if is_string(&**ty) {
return quote! {
let #ident = match #core::v8::Local::<#core::v8::String>::try_from(args.get(#idx as i32)) {
Ok(v8_string) => #core::serde_v8::to_utf8(v8_string, scope),
Err(_) => {
return #core::_ops::throw_type_error(scope, format!("Expected string at position {}", #idx));
}
};
};
}
// Fast path for `Option<String>`
if is_option_string(&**ty) {
return quote! {
let #ident = match #core::v8::Local::<#core::v8::String>::try_from(args.get(#idx as i32)) {
Ok(v8_string) => Some(#core::serde_v8::to_utf8(v8_string, scope)),
Err(_) => None
};
};
}
// Otherwise deserialize it via serde_v8
quote! {
let #ident = args.get(#idx as i32);
@ -680,6 +700,14 @@ fn is_result(ty: impl ToTokens) -> bool {
}
}
fn is_string(ty: impl ToTokens) -> bool {
tokens(ty) == "String"
}
fn is_option_string(ty: impl ToTokens) -> bool {
tokens(ty) == "Option < String >"
}
/// Detects if the type can be set using `rv.set_uint32` fast path
fn is_u32_rv(ty: impl ToTokens) -> bool {
["u32", "u8", "u16"].iter().any(|&s| tokens(&ty) == s) || is_resource_id(&ty)