bjoernager/rust
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Auto merge of #125410 - fmease:adj-lint-diag-api, r=nnethercote

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[perf] Delay the construction of early lint diag structs

Attacks some of the perf regressions from https://github.com/rust-lang/rust/pull/124417#issuecomment-2123700666.

See individual commits for details. The first three commits are not strictly necessary.
However, the 2nd one (06bc4fc671, *Remove `LintDiagnostic::msg`*) makes the main change way nicer to implement.
It's also pretty sweet on its own if I may say so myself.
This commit is contained in:
bors 2024-05-27 08:44:12 +00:00
commit b582f807fa
50 changed files with 598 additions and 749 deletions
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32
compiler/rustc_macros/src/diagnostics/diagnostic.rs
View file

@ -105,25 +105,12 @@ impl<'a> LintDiagnosticDerive<'a> {
pub(crate) fn into_tokens(self) -> TokenStream {
let LintDiagnosticDerive { mut structure } = self;
let kind = DiagnosticDeriveKind::LintDiagnostic;
let slugs = RefCell::new(Vec::new());
let implementation = kind.each_variant(&mut structure, |mut builder, variant| {
let preamble = builder.preamble(variant);
let body = builder.body(variant);
let formatting_init = &builder.formatting_init;
quote! {
#preamble
#formatting_init
#body
diag
}
});
let slugs = RefCell::new(Vec::new());
let msg = kind.each_variant(&mut structure, |mut builder, variant| {
// Collect the slug by generating the preamble.
let _ = builder.preamble(variant);
match builder.slug.value_ref() {
let primary_message = match builder.slug.value_ref() {
None => {
span_err(builder.span, "diagnostic slug not specified")
.help(
@ -146,9 +133,18 @@ impl<'a> LintDiagnosticDerive<'a> {
Some(slug) => {
slugs.borrow_mut().push(slug.clone());
quote! {
crate::fluent_generated::#slug.into()
diag.primary_message(crate::fluent_generated::#slug);
}
}
};
let formatting_init = &builder.formatting_init;
quote! {
#primary_message
#preamble
#formatting_init
#body
diag
}
});
@ -161,10 +157,6 @@ impl<'a> LintDiagnosticDerive<'a> {
) {
#implementation;
}
fn msg(&self) -> rustc_errors::DiagMessage {
#msg
}
}
});
for test in slugs.borrow().iter().map(|s| generate_test(s, &structure)) {

2
compiler/rustc_macros/src/diagnostics/mod.rs
View file

@ -91,7 +91,7 @@ pub fn diagnostic_derive(mut s: Structure<'_>) -> TokenStream {
/// Then, later, to emit the error:
///
/// ```ignore (rust)
/// cx.span_lint(INVALID_ATOMIC_ORDERING, fail_order_arg_span, AtomicOrderingInvalidLint {
/// cx.emit_span_lint(INVALID_ATOMIC_ORDERING, fail_order_arg_span, AtomicOrderingInvalidLint {
/// method,
/// success_ordering,
/// fail_ordering,