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Prefer visibility paths where items are not named _

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This commit is contained in:
Michael Goulet 2021-11-30 17:18:48 -08:00
parent 48dab5c960
commit 1f2cf1e9b7
1 changed files with 19 additions and 4 deletions
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23
compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
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@ -17,7 +17,7 @@ use rustc_session::utils::NativeLibKind;
use rustc_session::{Session, StableCrateId};
use rustc_span::hygiene::{ExpnHash, ExpnId};
use rustc_span::source_map::{Span, Spanned};
use rustc_span::symbol::Symbol;
use rustc_span::symbol::{kw, Symbol};
use rustc_data_structures::sync::Lrc;
use smallvec::SmallVec;
@ -295,6 +295,10 @@ pub fn provide(providers: &mut Providers) {
use std::collections::vec_deque::VecDeque;
let mut visible_parent_map: DefIdMap<DefId> = Default::default();
// This is a secondary visible_parent_map, storing the DefId of parents that re-export
// the child as `_`. Since we prefer parents that don't do this, merge this map at the
// end, only if we're missing any keys from the former.
let mut fallback_map: DefIdMap<DefId> = Default::default();
// Issue 46112: We want the map to prefer the shortest
// paths when reporting the path to an item. Therefore we
@ -317,12 +321,17 @@ pub fn provide(providers: &mut Providers) {
bfs_queue.push_back(DefId { krate: cnum, index: CRATE_DEF_INDEX });
}
let mut add_child = |bfs_queue: &mut VecDeque<_>, child: &Export, parent: DefId| {
if !child.vis.is_public() {
let mut add_child = |bfs_queue: &mut VecDeque<_>, export: &Export, parent: DefId| {
if !export.vis.is_public() {
return;
}
if let Some(child) = child.res.opt_def_id() {
if let Some(child) = export.res.opt_def_id() {
if export.ident.name == kw::Underscore {
fallback_map.insert(child, parent);
return;
}
match visible_parent_map.entry(child) {
Entry::Occupied(mut entry) => {
// If `child` is defined in crate `cnum`, ensure
@ -345,6 +354,12 @@ pub fn provide(providers: &mut Providers) {
}
}
// Fill in any missing entries with the (less preferable) path ending in `::_`.
// We still use this path in a diagnostic that suggests importing `::*`.
for (child, parent) in fallback_map {
visible_parent_map.entry(child).or_insert(parent);
}
visible_parent_map
},