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Make Session::features_untracked thread-safe

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This commit is contained in:
John Kåre Alsaker 2018-04-01 08:21:21 +02:00
parent a46f05978a
commit 904e2b6b35
1 changed files with 5 additions and 11 deletions
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16
src/librustc/session/mod.rs
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@ -101,7 +101,7 @@ pub struct Session {
/// trans::back::symbol_names module for more information.
pub crate_disambiguator: RefCell<Option<CrateDisambiguator>>,
features: RefCell<Option<feature_gate::Features>>,
features: Once<feature_gate::Features>,
/// The maximum recursion limit for potentially infinitely recursive
/// operations such as auto-dereference and monomorphization.
@ -532,18 +532,12 @@ impl Session {
/// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents
/// dependency tracking. Use tcx.features() instead.
#[inline]
pub fn features_untracked(&self) -> cell::Ref<feature_gate::Features> {
let features = self.features.borrow();
if features.is_none() {
bug!("Access to Session::features before it is initialized");
}
cell::Ref::map(features, |r| r.as_ref().unwrap())
pub fn features_untracked(&self) -> &feature_gate::Features {
self.features.get()
}
pub fn init_features(&self, features: feature_gate::Features) {
*(self.features.borrow_mut()) = Some(features);
self.features.set(features);
}
/// Calculates the flavor of LTO to use for this compilation.
@ -1108,7 +1102,7 @@ pub fn build_session_(
crate_types: RefCell::new(Vec::new()),
dependency_formats: RefCell::new(FxHashMap()),
crate_disambiguator: RefCell::new(None),
features: RefCell::new(None),
features: Once::new(),
recursion_limit: Once::new(),
type_length_limit: Once::new(),
const_eval_stack_frame_limit: 100,