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Remove enum_from_u32.

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It's a macro that just creates an enum with a `from_u32` method. It has
two arms. One is unused and the other has a single use.

This commit inlines that single use and removes the whole macro. This
increases readability because we don't have two different macros
interacting (`enum_from_u32` and `language_item_table`).
This commit is contained in:
Nicholas Nethercote 2024-05-06 13:51:15 +10:00
parent d3d01e1cd3
commit 58a06b6a99
3 changed files with 19 additions and 51 deletions
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1
compiler/rustc_data_structures/src/lib.rs
View File

@ -62,7 +62,6 @@ pub mod fx;
pub mod graph;
pub mod intern;
pub mod jobserver;
pub mod macros;
pub mod marker;
pub mod memmap;
pub mod obligation_forest;

37
compiler/rustc_data_structures/src/macros.rs
View File

@ -1,37 +0,0 @@
#[macro_export]
macro_rules! enum_from_u32 {
($(#[$attr:meta])* pub enum $name:ident {
$($(#[$var_attr:meta])* $variant:ident = $e:expr,)*
}) => {
$(#[$attr])*
pub enum $name {
$($(#[$var_attr])* $variant = $e),*
}
impl $name {
pub fn from_u32(u: u32) -> Option<$name> {
$(if u == $name::$variant as u32 {
return Some($name::$variant)
})*
None
}
}
};
($(#[$attr:meta])* pub enum $name:ident {
$($(#[$var_attr:meta])* $variant:ident,)*
}) => {
$(#[$attr])*
pub enum $name {
$($(#[$var_attr])* $variant,)*
}
impl $name {
pub fn from_u32(u: u32) -> Option<$name> {
$(if u == $name::$variant as u32 {
return Some($name::$variant)
})*
None
}
}
}
}

32
compiler/rustc_hir/src/lang_items.rs
View File

@ -55,21 +55,27 @@ macro_rules! language_item_table {
(
$( $(#[$attr:meta])* $variant:ident, $module:ident :: $name:ident, $method:ident, $target:expr, $generics:expr; )*
) => {
rustc_data_structures::enum_from_u32! {
/// A representation of all the valid lang items in Rust.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Encodable, Decodable)]
pub enum LangItem {
$(
#[doc = concat!("The `", stringify!($name), "` lang item.")]
///
$(#[$attr])*
$variant,
)*
}
/// A representation of all the valid lang items in Rust.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Encodable, Decodable)]
pub enum LangItem {
$(
#[doc = concat!("The `", stringify!($name), "` lang item.")]
$(#[$attr])*
$variant,
)*
}
impl LangItem {
fn from_u32(u: u32) -> Option<LangItem> {
// This implementation is clumsy, but makes no assumptions
// about how discriminant tags are allocated within the
// range `0 .. std::mem::variant_count::<LangItem>()`.
$(if u == LangItem::$variant as u32 {
return Some(LangItem::$variant)
})*
None
}
/// Returns the `name` symbol in `#[lang = "$name"]`.
/// For example, [`LangItem::PartialEq`]`.name()`
/// would result in [`sym::eq`] since it is `#[lang = "eq"]`.
@ -147,7 +153,7 @@ language_item_table! {
Clone, sym::clone, clone_trait, Target::Trait, GenericRequirement::None;
Sync, sym::sync, sync_trait, Target::Trait, GenericRequirement::Exact(0);
DiscriminantKind, sym::discriminant_kind, discriminant_kind_trait, Target::Trait, GenericRequirement::None;
/// The associated item of the [`DiscriminantKind`] trait.
/// The associated item of the `DiscriminantKind` trait.
Discriminant, sym::discriminant_type, discriminant_type, Target::AssocTy, GenericRequirement::None;
PointeeTrait, sym::pointee_trait, pointee_trait, Target::Trait, GenericRequirement::None;