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Factor out some repeated feature-getting code.

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This commit is contained in:
Nicholas Nethercote 2023-10-05 11:15:14 +11:00
parent e24f394404
commit 9e2cd038b0
1 changed files with 11 additions and 18 deletions
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29
compiler/rustc_expand/src/config.rs
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@ -24,6 +24,7 @@ use rustc_session::Session;
use rustc_span::edition::{Edition, ALL_EDITIONS};
use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use thin_vec::ThinVec;
/// A folder that strips out items that do not belong in the current configuration.
pub struct StripUnconfigured<'a> {
@ -54,6 +55,14 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute]) -> Features {
})
}
fn feature_list(attr: &Attribute) -> ThinVec<ast::NestedMetaItem> {
if attr.has_name(sym::feature) && let Some(list) = attr.meta_item_list() {
list
} else {
ThinVec::new()
}
}
let mut features = Features::default();
let mut edition_enabled_features = FxHashMap::default();
let crate_edition = sess.edition();
@ -81,15 +90,7 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute]) -> Features {
// - E.g. enable `test_2018_feature` if the crate edition is 2015 but
// `rust_2018_preview` is present
for attr in krate_attrs {
if !attr.has_name(sym::feature) {
continue;
}
let Some(list) = attr.meta_item_list() else {
continue;
};
for mi in list {
for mi in feature_list(attr) {
if !mi.is_word() {
continue;
}
@ -114,15 +115,7 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute]) -> Features {
// Process all features declared in the code.
for attr in krate_attrs {
if !attr.has_name(sym::feature) {
continue;
}
let Some(list) = attr.meta_item_list() else {
continue;
};
for mi in list {
for mi in feature_list(attr) {
let name = match mi.ident() {
Some(ident) if mi.is_word() => ident.name,
Some(ident) => {