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Avoid loading and parsing unconfigured non-inline modules.

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This commit is contained in:
Jeffrey Seyfried
2016-09-14 22:36:42 +00:00
parent 5a5736db91
commit b232f6d9fe
2 changed files with 19 additions and 10 deletions
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27
src/libsyntax/parse/parser.rs
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@@ -5291,20 +5291,29 @@ impl<'a> Parser<'a> {
/// Parse a `mod <foo> { ... }` or `mod <foo>;` item
fn parse_item_mod(&mut self, outer_attrs: &[Attribute]) -> PResult<'a, ItemInfo> {
let outer_attrs = ::config::StripUnconfigured {
config: &self.cfg,
sess: self.sess,
should_test: false, // irrelevant
features: None, // don't perform gated feature checking
}.process_cfg_attrs(outer_attrs.to_owned());
let (in_cfg, outer_attrs) = {
let mut strip_unconfigured = ::config::StripUnconfigured {
config: &self.cfg,
sess: self.sess,
should_test: false, // irrelevant
features: None, // don't perform gated feature checking
};
let outer_attrs = strip_unconfigured.process_cfg_attrs(outer_attrs.to_owned());
(strip_unconfigured.in_cfg(&outer_attrs), outer_attrs)
};
let id_span = self.span;
let id = self.parse_ident()?;
if self.check(&token::Semi) {
self.bump();
// This mod is in an external file. Let's go get it!
let (m, attrs) = self.eval_src_mod(id, &outer_attrs, id_span)?;
Ok((id, m, Some(attrs)))
if in_cfg {
// This mod is in an external file. Let's go get it!
let (m, attrs) = self.eval_src_mod(id, &outer_attrs, id_span)?;
Ok((id, m, Some(attrs)))
} else {
let placeholder = ast::Mod { inner: syntax_pos::DUMMY_SP, items: Vec::new() };
Ok((id, ItemKind::Mod(placeholder), None))
}
} else {
let directory = self.directory.clone();
self.push_directory(id, &outer_attrs);