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Clean up inherent_impls #62268

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Jul 4, 2019
Merged

Clean up inherent_impls #62268

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33 changes: 4 additions & 29 deletions src/librustc_typeck/coherence/inherent_impls.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@
//! `tcx.inherent_impls(def_id)`). That value, however,
//! is computed by selecting an idea from this table.
use rustc::dep_graph::DepKind;
use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
use rustc::hir;
use rustc::hir::itemlikevisit::ItemLikeVisitor;
Expand Down Expand Up @@ -36,35 +35,11 @@ pub fn crate_inherent_impls<'tcx>(
pub fn inherent_impls<'tcx>(tcx: TyCtxt<'tcx>, ty_def_id: DefId) -> &'tcx [DefId] {
assert!(ty_def_id.is_local());

// NB. Until we adopt the red-green dep-tracking algorithm (see
// [the plan] for details on that), we do some hackery here to get
// the dependencies correct. Basically, we use a `with_ignore` to
// read the result we want. If we didn't have the `with_ignore`,
// we would wind up with a dependency on the entire crate, which
// we don't want. Then we go and add dependencies on all the impls
// in the result (which is what we wanted).
//
// The result is a graph with an edge from `Hir(I)` for every impl
// `I` defined on some type `T` to `CoherentInherentImpls(T)`,
// thus ensuring that if any of those impls change, the set of
// inherent impls is considered dirty.
//
// [the plan]: https://github.com/rust-lang/rust-roadmap/issues/4

let result = tcx.dep_graph.with_ignore(|| {
let crate_map = tcx.crate_inherent_impls(ty_def_id.krate);
match crate_map.inherent_impls.get(&ty_def_id) {
Some(v) => &v[..],
None => &[],
}
});

for &impl_def_id in &result[..] {
let def_path_hash = tcx.def_path_hash(impl_def_id);
tcx.dep_graph.read(def_path_hash.to_dep_node(DepKind::Hir));
let crate_map = tcx.crate_inherent_impls(ty_def_id.krate);
match crate_map.inherent_impls.get(&ty_def_id) {
Some(v) => &v[..],
None => &[],
}

result
}

struct InherentCollect<'tcx> {
Expand Down