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Auto merge of #30135 - michaelwoerister:interning-checks, r=sanxiyn

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This PR adds some safety checks to interning things in `ty::ctxt`. Accidentally re-interning an `AdtDef` has bitten me in the behind just last week (it messes up things in very subtle way only showing up later as an LLVM assertion).

Initially I had also added a check to `ty::ctxt::node_type_insert()` -- but there it seems to be expected that the same table slot is written to multiple times.

Roll-up candidate.
This commit is contained in:
bors 2015-12-01 13:19:41 +00:00
commit 4dda364ab3
1 changed files with 18 additions and 5 deletions
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23
src/librustc/middle/ty/context.rs
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@ -408,7 +408,10 @@ impl<'tcx> ctxt<'tcx> {
-> &'tcx ty::TraitDef<'tcx> {
let did = def.trait_ref.def_id;
let interned = self.arenas.trait_defs.alloc(def);
self.trait_defs.borrow_mut().insert(did, interned);
if let Some(prev) = self.trait_defs.borrow_mut().insert(did, interned) {
self.sess.bug(&format!("Tried to overwrite interned TraitDef: {:?}",
prev))
}
interned
}
@ -425,7 +428,10 @@ impl<'tcx> ctxt<'tcx> {
let def = ty::AdtDefData::new(self, did, kind, variants);
let interned = self.arenas.adt_defs.alloc(def);
// this will need a transmute when reverse-variance is removed
self.adt_defs.borrow_mut().insert(did, interned);
if let Some(prev) = self.adt_defs.borrow_mut().insert(did, interned) {
self.sess.bug(&format!("Tried to overwrite interned AdtDef: {:?}",
prev))
}
interned
}
@ -435,13 +441,20 @@ impl<'tcx> ctxt<'tcx> {
}
let interned = self.arenas.stability.alloc(stab);
self.stability_interner.borrow_mut().insert(interned, interned);
if let Some(prev) = self.stability_interner
.borrow_mut()
.insert(interned, interned) {
self.sess.bug(&format!("Tried to overwrite interned Stability: {:?}",
prev))
}
interned
}
pub fn store_free_region_map(&self, id: NodeId, map: FreeRegionMap) {
self.free_region_maps.borrow_mut()
.insert(id, map);
if self.free_region_maps.borrow_mut().insert(id, map).is_some() {
self.sess.bug(&format!("Tried to overwrite interned FreeRegionMap for NodeId {:?}",
id))
}
}
pub fn free_region_map(&self, id: NodeId) -> FreeRegionMap {