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Simplify bound var resolution.

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This commit is contained in:
Camille GILLOT 2024-08-18 16:10:54 +00:00
parent c7cb45a791
commit 6ec58a44e2
4 changed files with 39 additions and 44 deletions
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56
compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
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@ -11,10 +11,13 @@ use std::fmt;
use rustc_ast::visit::walk_list;
use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
use rustc_data_structures::sorted_map::SortedMap;
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Res};
use rustc_hir::intravisit::{self, Visitor};
use rustc_hir::{GenericArg, GenericParam, GenericParamKind, HirId, HirIdMap, LifetimeName, Node};
use rustc_hir::{
GenericArg, GenericParam, GenericParamKind, HirId, ItemLocalMap, LifetimeName, Node,
};
use rustc_macros::extension;
use rustc_middle::hir::nested_filter;
use rustc_middle::middle::resolve_bound_vars::*;
@ -74,7 +77,7 @@ impl ResolvedArg {
struct NamedVarMap {
// maps from every use of a named (not anonymous) bound var to a
// `ResolvedArg` describing how that variable is bound
defs: HirIdMap<ResolvedArg>,
defs: ItemLocalMap<ResolvedArg>,
// Maps relevant hir items to the bound vars on them. These include:
// - function defs
@ -82,7 +85,7 @@ struct NamedVarMap {
// - closures
// - trait refs
// - bound types (like `T` in `for<'a> T<'a>: Foo`)
late_bound_vars: HirIdMap<Vec<ty::BoundVariableKind>>,
late_bound_vars: ItemLocalMap<Vec<ty::BoundVariableKind>>,
}
struct BoundVarContext<'a, 'tcx> {
@ -225,10 +228,10 @@ pub(crate) fn provide(providers: &mut Providers) {
*providers = Providers {
resolve_bound_vars,
named_variable_map: |tcx, id| tcx.resolve_bound_vars(id).defs.get(&id),
named_variable_map: |tcx, id| &tcx.resolve_bound_vars(id).defs,
is_late_bound_map,
object_lifetime_default,
late_bound_vars_map: |tcx, id| tcx.resolve_bound_vars(id).late_bound_vars.get(&id),
late_bound_vars_map: |tcx, id| &tcx.resolve_bound_vars(id).late_bound_vars,
..*providers
};
@ -265,16 +268,12 @@ fn resolve_bound_vars(tcx: TyCtxt<'_>, local_def_id: hir::OwnerId) -> ResolveBou
hir::OwnerNode::Synthetic => unreachable!(),
}
let mut rl = ResolveBoundVars::default();
for (hir_id, v) in named_variable_map.defs {
let map = rl.defs.entry(hir_id.owner).or_default();
map.insert(hir_id.local_id, v);
}
for (hir_id, v) in named_variable_map.late_bound_vars {
let map = rl.late_bound_vars.entry(hir_id.owner).or_default();
map.insert(hir_id.local_id, v);
}
let defs = named_variable_map.defs.into_sorted_stable_ord();
let late_bound_vars = named_variable_map.late_bound_vars.into_sorted_stable_ord();
let rl = ResolveBoundVars {
defs: SortedMap::from_presorted_elements(defs),
late_bound_vars: SortedMap::from_presorted_elements(late_bound_vars),
};
debug!(?rl.defs);
debug!(?rl.late_bound_vars);
@ -340,7 +339,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
Scope::Binder { hir_id, .. } => {
// Nested poly trait refs have the binders concatenated
let mut full_binders =
self.map.late_bound_vars.entry(*hir_id).or_default().clone();
self.map.late_bound_vars.entry(hir_id.local_id).or_default().clone();
full_binders.extend(supertrait_bound_vars);
break (full_binders, BinderScopeType::Concatenating);
}
@ -677,7 +676,7 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
hir::TyKind::Ref(lifetime_ref, ref mt) => {
self.visit_lifetime(lifetime_ref);
let scope = Scope::ObjectLifetimeDefault {
lifetime: self.map.defs.get(&lifetime_ref.hir_id).cloned(),
lifetime: self.map.defs.get(&lifetime_ref.hir_id.local_id).cloned(),
s: self.scope,
};
self.with(scope, |this| this.visit_ty(mt.ty));
@ -704,7 +703,7 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
// and ban them. Type variables instantiated inside binders aren't
// well-supported at the moment, so this doesn't work.
// In the future, this should be fixed and this error should be removed.
let def = self.map.defs.get(&lifetime.hir_id).copied();
let def = self.map.defs.get(&lifetime.hir_id.local_id).copied();
let Some(ResolvedArg::LateBound(_, _, lifetime_def_id)) = def else { continue };
let lifetime_hir_id = self.tcx.local_def_id_to_hir_id(lifetime_def_id);
@ -841,7 +840,7 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
let bound_vars: Vec<_> =
self.tcx.fn_sig(sig_id).skip_binder().bound_vars().iter().collect();
let hir_id = self.tcx.local_def_id_to_hir_id(def_id);
self.map.late_bound_vars.insert(hir_id, bound_vars);
self.map.late_bound_vars.insert(hir_id.local_id, bound_vars);
}
self.visit_fn_like_elision(fd.inputs, output, matches!(fk, intravisit::FnKind::Closure));
intravisit::walk_fn_kind(self, fk);
@ -1019,10 +1018,10 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
}
fn record_late_bound_vars(&mut self, hir_id: HirId, binder: Vec<ty::BoundVariableKind>) {
if let Some(old) = self.map.late_bound_vars.insert(hir_id, binder) {
if let Some(old) = self.map.late_bound_vars.insert(hir_id.local_id, binder) {
bug!(
"overwrote bound vars for {hir_id:?}:\nold={old:?}\nnew={:?}",
self.map.late_bound_vars[&hir_id]
self.map.late_bound_vars[&hir_id.local_id]
)
}
}
@ -1381,9 +1380,9 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
kind.descr(param_def_id.to_def_id())
),
};
self.map.defs.insert(hir_id, ResolvedArg::Error(guar));
self.map.defs.insert(hir_id.local_id, ResolvedArg::Error(guar));
} else {
self.map.defs.insert(hir_id, def);
self.map.defs.insert(hir_id.local_id, def);
}
return;
}
@ -1416,7 +1415,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
bug!("unexpected def-kind: {}", kind.descr(param_def_id.to_def_id()))
}
});
self.map.defs.insert(hir_id, ResolvedArg::Error(guar));
self.map.defs.insert(hir_id.local_id, ResolvedArg::Error(guar));
return;
}
Scope::Root { .. } => break,
@ -1526,7 +1525,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
// This index can be used with `generic_args` since `parent_count == 0`.
let index = generics.param_def_id_to_index[&param_def_id] as usize;
generic_args.args.get(index).and_then(|arg| match arg {
GenericArg::Lifetime(lt) => map.defs.get(&lt.hir_id).copied(),
GenericArg::Lifetime(lt) => map.defs.get(&lt.hir_id.local_id).copied(),
_ => None,
})
}
@ -1816,7 +1815,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
#[instrument(level = "debug", skip(self))]
fn insert_lifetime(&mut self, lifetime_ref: &'tcx hir::Lifetime, def: ResolvedArg) {
debug!(span = ?lifetime_ref.ident.span);
self.map.defs.insert(lifetime_ref.hir_id, def);
self.map.defs.insert(lifetime_ref.hir_id.local_id, def);
}
/// Sometimes we resolve a lifetime, but later find that it is an
@ -1827,8 +1826,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
lifetime_ref: &'tcx hir::Lifetime,
bad_def: ResolvedArg,
) {
// FIXME(#120456) - is `swap_remove` correct?
let old_value = self.map.defs.swap_remove(&lifetime_ref.hir_id);
let old_value = self.map.defs.remove(&lifetime_ref.hir_id.local_id);
assert_eq!(old_value, Some(bad_def));
}
@ -1998,7 +1996,7 @@ impl<'a, 'tcx> BoundVarContext<'a, 'tcx> {
// See where these vars are used in `HirTyLowerer::lower_ty_maybe_return_type_notation`.
// And this is exercised in:
// `tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.rs`.
let existing_bound_vars = self.map.late_bound_vars.get_mut(&hir_id).unwrap();
let existing_bound_vars = self.map.late_bound_vars.get_mut(&hir_id.local_id).unwrap();
let existing_bound_vars_saved = existing_bound_vars.clone();
existing_bound_vars.extend(bound_vars);
self.record_late_bound_vars(item_segment.hir_id, existing_bound_vars_saved);