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Avoid a collection and iteration on empty passes #120853

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Merged
merged 2 commits into from
Feb 10, 2024
Merged

Avoid a collection and iteration on empty passes #120853

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e59d9b1
Avoid a collection and iteration on empty passes
blyxyas Feb 9, 2024
4ef1790
tidy
blyxyas Feb 9, 2024
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9 changes: 3 additions & 6 deletions compiler/rustc_lint/src/late.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -364,14 +364,11 @@ pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
// Note: `passes` is often empty. In that case, it's faster to run
// `builtin_lints` directly rather than bundling it up into the
// `RuntimeCombinedLateLintPass`.
let mut passes: Vec<_> = unerased_lint_store(tcx.sess)
.late_module_passes
.iter()
.map(|mk_pass| (mk_pass)(tcx))
.collect();
if passes.is_empty() {
let late_module_passes = &unerased_lint_store(tcx.sess).late_module_passes;
if late_module_passes.is_empty() {
late_lint_mod_inner(tcx, module_def_id, context, builtin_lints);
} else {
let mut passes: Vec<_> = late_module_passes.iter().map(|mk_pass| (mk_pass)(tcx)).collect();
passes.push(Box::new(builtin_lints));
let pass = RuntimeCombinedLateLintPass { passes: &mut passes[..] };
late_lint_mod_inner(tcx, module_def_id, context, pass);
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