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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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2
compiler/rustc_errors/src/diagnostic.rs
View file

@ -200,8 +200,6 @@ pub trait SubdiagMessageOp<G: EmissionGuarantee> =
pub trait LintDiagnostic<'a, G: EmissionGuarantee> {
/// Decorate and emit a lint.
fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, G>);
fn msg(&self) -> DiagMessage;
}
#[derive(Clone, Debug, Encodable, Decodable)]

6
compiler/rustc_errors/src/lib.rs
View file

@ -39,7 +39,7 @@ pub use diagnostic_impls::{
};
pub use emitter::ColorConfig;
pub use rustc_error_messages::{
fallback_fluent_bundle, fluent_bundle, DelayDm, DiagMessage, FluentBundle, LanguageIdentifier,
fallback_fluent_bundle, fluent_bundle, DiagMessage, FluentBundle, LanguageIdentifier,
LazyFallbackBundle, MultiSpan, SpanLabel, SubdiagMessage,
};
pub use rustc_lint_defs::{pluralize, Applicability};
@ -572,8 +572,8 @@ impl Drop for DiagCtxtInner {
if let Some(backtrace) = &self.must_produce_diag {
panic!(
"must_produce_diag: `trimmed_def_paths` called but no diagnostics emitted; \
use `DelayDm` for lints or `with_no_trimmed_paths` for debugging. \
called at: {backtrace}"
`with_no_trimmed_paths` for debugging. \
called at: {backtrace}"
);
}
}