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[rustdoc] Remove duplicated loop when computing doc cfgs #138755

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Mar 25, 2025
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[rustdoc] Remove duplicated loop when computing doc cfgs #138755

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59 changes: 21 additions & 38 deletions src/librustdoc/clean/types.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1013,7 +1013,6 @@ pub(crate) fn extract_cfg_from_attrs<'a, I: Iterator<Item = &'a hir::Attribute>
tcx: TyCtxt<'_>,
hidden_cfg: &FxHashSet<Cfg>,
) -> Option<Arc<Cfg>> {
let sess = tcx.sess;
let doc_cfg_active = tcx.features().doc_cfg();
let doc_auto_cfg_active = tcx.features().doc_auto_cfg();

Expand All @@ -1034,9 +1033,27 @@ pub(crate) fn extract_cfg_from_attrs<'a, I: Iterator<Item = &'a hir::Attribute>
.filter(|attr| attr.has_name(sym::cfg))
.peekable();
if doc_cfg.peek().is_some() && doc_cfg_active {
doc_cfg
.filter_map(|attr| Cfg::parse(&attr).ok())
.fold(Cfg::True, |cfg, new_cfg| cfg & new_cfg)
let sess = tcx.sess;
doc_cfg.fold(Cfg::True, |mut cfg, item| {
if let Some(cfg_mi) =
item.meta_item().and_then(|item| rustc_expand::config::parse_cfg(item, sess))
{
// The result is unused here but we can gate unstable predicates
rustc_attr_parsing::cfg_matches(
cfg_mi,
tcx.sess,
rustc_ast::CRATE_NODE_ID,
Some(tcx.features()),
);
match Cfg::parse(cfg_mi) {
Ok(new_cfg) => cfg &= new_cfg,
Err(e) => {
sess.dcx().span_err(e.span, e.msg);
}
}
}
cfg
})
} else if doc_auto_cfg_active {
// If there is no `doc(cfg())`, then we retrieve the `cfg()` attributes (because
// `doc(cfg())` overrides `cfg()`).
Expand All @@ -1053,40 +1070,6 @@ pub(crate) fn extract_cfg_from_attrs<'a, I: Iterator<Item = &'a hir::Attribute>
Cfg::True
};

for attr in attrs.clone() {
// #[doc]
if attr.doc_str().is_none() && attr.has_name(sym::doc) {
// #[doc(...)]
if let Some(list) = attr.meta_item_list() {
for item in list {
// #[doc(hidden)]
if !item.has_name(sym::cfg) {
continue;
}
// #[doc(cfg(...))]
if let Some(cfg_mi) = item
.meta_item()
.and_then(|item| rustc_expand::config::parse_cfg(item, sess))
{
// The result is unused here but we can gate unstable predicates
rustc_attr_parsing::cfg_matches(
cfg_mi,
tcx.sess,
rustc_ast::CRATE_NODE_ID,
Some(tcx.features()),
);
match Cfg::parse(cfg_mi) {
Ok(new_cfg) => cfg &= new_cfg,
Err(e) => {
sess.dcx().span_err(e.span, e.msg);
}
}
}
}
}
}
}

// treat #[target_feature(enable = "feat")] attributes as if they were
// #[doc(cfg(target_feature = "feat"))] attributes as well
for attr in hir_attr_lists(attrs, sym::target_feature) {
Expand Down
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