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Slightly reduced number of allocations

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Mingun 2023-05-19 22:21:51 +05:00
parent 78fea3aa4a
commit 7ca7720262
1 changed files with 13 additions and 21 deletions
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34
serde_derive/src/de.rs
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@ -2221,16 +2221,14 @@ fn deserialize_identifier(
flat_fields.extend(aliases.iter().map(|alias| (alias, ident)));
}
let field_strs: &Vec<_> = &flat_fields.iter().map(|(name, _)| name).collect();
let field_bytes: &Vec<_> = &flat_fields
.iter()
.map(|(name, _)| Literal::byte_string(name.as_bytes()))
.collect();
let str_mapping = flat_fields.iter().map(|(name, ident)| {
quote!(#name => _serde::__private::Ok(#this_value::#ident))
});
let bytes_mapping = flat_fields.iter().map(|(name, ident)| {
let name = Literal::byte_string(name.as_bytes());
quote!(#name => _serde::__private::Ok(#this_value::#ident))
});
let constructors: &Vec<_> = &flat_fields
.iter()
.map(|(_, ident)| quote!(#this_value::#ident))
.collect();
let main_constructors: &Vec<_> = &fields
.iter()
.map(|(_, ident, _)| quote!(#this_value::#ident))
@ -2416,6 +2414,8 @@ fn deserialize_identifier(
};
let visit_borrowed = if fallthrough_borrowed.is_some() || collect_other_fields {
let str_mapping = str_mapping.clone();
let bytes_mapping = bytes_mapping.clone();
let fallthrough_borrowed_arm = fallthrough_borrowed.as_ref().unwrap_or(fallthrough_arm);
Some(quote! {
fn visit_borrowed_str<__E>(self, __value: &'de str) -> _serde::__private::Result<Self::Value, __E>
@ -2423,9 +2423,7 @@ fn deserialize_identifier(
__E: _serde::de::Error,
{
match __value {
#(
#field_strs => _serde::__private::Ok(#constructors),
)*
#(#str_mapping,)*
_ => {
#value_as_borrowed_str_content
#fallthrough_borrowed_arm
@ -2438,9 +2436,7 @@ fn deserialize_identifier(
__E: _serde::de::Error,
{
match __value {
#(
#field_bytes => _serde::__private::Ok(#constructors),
)*
#(#bytes_mapping,)*
_ => {
#bytes_to_str
#value_as_borrowed_bytes_content
@ -2465,9 +2461,7 @@ fn deserialize_identifier(
__E: _serde::de::Error,
{
match __value {
#(
#field_strs => _serde::__private::Ok(#constructors),
)*
#(#str_mapping,)*
_ => {
#value_as_str_content
#fallthrough_arm
@ -2480,9 +2474,7 @@ fn deserialize_identifier(
__E: _serde::de::Error,
{
match __value {
#(
#field_bytes => _serde::__private::Ok(#constructors),
)*
#(#bytes_mapping,)*
_ => {
#bytes_to_str
#value_as_bytes_content