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Add rustc_fluent_macro to decouple fluent from rustc_macros

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Fluent, with all the icu4x it brings in, takes quite some time to
compile. `fluent_messages!` is only needed in further downstream rustc
crates, but is blocking more upstream crates like `rustc_index`. By
splitting it out, we allow `rustc_macros` to be compiled earlier, which
speeds up `x check compiler` by about 5 seconds (and even more after the
needless dependency on `serde_json` is removed from
`rustc_data_structures`).
This commit is contained in:
Nilstrieb 2023-04-16 14:33:00 +02:00
parent de96f3d873
commit b5d3d970fa
81 changed files with 398 additions and 293 deletions
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54
compiler/rustc_macros/src/lib.rs
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@ -54,60 +54,6 @@ pub fn newtype_index(input: TokenStream) -> TokenStream {
newtype::newtype(input)
}
/// Implements the `fluent_messages` macro, which performs compile-time validation of the
/// compiler's Fluent resources (i.e. that the resources parse and don't multiply define the same
/// messages) and generates constants that make using those messages in diagnostics more ergonomic.
///
/// For example, given the following invocation of the macro..
///
/// ```ignore (rust)
/// fluent_messages! { "./typeck.ftl" }
/// ```
/// ..where `typeck.ftl` has the following contents..
///
/// ```fluent
/// typeck_field_multiply_specified_in_initializer =
/// field `{$ident}` specified more than once
/// .label = used more than once
/// .label_previous_use = first use of `{$ident}`
/// ```
/// ...then the macro parse the Fluent resource, emitting a diagnostic if it fails to do so, and
/// will generate the following code:
///
/// ```ignore (rust)
/// pub static DEFAULT_LOCALE_RESOURCE: &'static [&'static str] = include_str!("./typeck.ftl");
///
/// mod fluent_generated {
/// mod typeck {
/// pub const field_multiply_specified_in_initializer: DiagnosticMessage =
/// DiagnosticMessage::fluent("typeck_field_multiply_specified_in_initializer");
/// pub const field_multiply_specified_in_initializer_label_previous_use: DiagnosticMessage =
/// DiagnosticMessage::fluent_attr(
/// "typeck_field_multiply_specified_in_initializer",
/// "previous_use_label"
/// );
/// }
/// }
/// ```
/// When emitting a diagnostic, the generated constants can be used as follows:
///
/// ```ignore (rust)
/// let mut err = sess.struct_span_err(
/// span,
/// fluent::typeck::field_multiply_specified_in_initializer
/// );
/// err.span_default_label(span);
/// err.span_label(
/// previous_use_span,
/// fluent::typeck::field_multiply_specified_in_initializer_label_previous_use
/// );
/// err.emit();
/// ```
#[proc_macro]
pub fn fluent_messages(input: TokenStream) -> TokenStream {
diagnostics::fluent_messages(input)
}
decl_derive!([HashStable, attributes(stable_hasher)] => hash_stable::hash_stable_derive);
decl_derive!(
[HashStable_Generic, attributes(stable_hasher)] =>