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Don't call own_existential_vtable_entries on unresolved trait ref

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This commit is contained in:
Michael Goulet 2022-10-19 01:27:32 +00:00
parent a6b5f95fb0
commit 1e2eb97c6e
3 changed files with 8 additions and 19 deletions
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4
compiler/rustc_middle/src/query/mod.rs
View File

@ -1207,9 +1207,9 @@ rustc_queries! {
}
query own_existential_vtable_entries(
key: ty::PolyExistentialTraitRef<'tcx>
key: DefId
) -> &'tcx [DefId] {
desc { |tcx| "finding all existential vtable entries for trait `{}`", tcx.def_path_str(key.def_id()) }
desc { |tcx| "finding all existential vtable entries for trait `{}`", tcx.def_path_str(key) }
}
query vtable_entries(key: ty::PolyTraitRef<'tcx>)

11
compiler/rustc_trait_selection/src/traits/mod.rs
View File

@ -764,12 +764,9 @@ fn dump_vtable_entries<'tcx>(
});
}
fn own_existential_vtable_entries<'tcx>(
tcx: TyCtxt<'tcx>,
trait_ref: ty::PolyExistentialTraitRef<'tcx>,
) -> &'tcx [DefId] {
fn own_existential_vtable_entries<'tcx>(tcx: TyCtxt<'tcx>, trait_def_id: DefId) -> &'tcx [DefId] {
let trait_methods = tcx
.associated_items(trait_ref.def_id())
.associated_items(trait_def_id)
.in_definition_order()
.filter(|item| item.kind == ty::AssocKind::Fn);
// Now list each method's DefId (for within its trait).
@ -778,7 +775,7 @@ fn own_existential_vtable_entries<'tcx>(
let def_id = trait_method.def_id;
// Some methods cannot be called on an object; skip those.
if !is_vtable_safe_method(tcx, trait_ref.def_id(), &trait_method) {
if !is_vtable_safe_method(tcx, trait_def_id, &trait_method) {
debug!("own_existential_vtable_entry: not vtable safe");
return None;
}
@ -810,7 +807,7 @@ fn vtable_entries<'tcx>(
// Lookup the shape of vtable for the trait.
let own_existential_entries =
tcx.own_existential_vtable_entries(existential_trait_ref);
tcx.own_existential_vtable_entries(existential_trait_ref.def_id());
let own_entries = own_existential_entries.iter().copied().map(|def_id| {
debug!("vtable_entries: trait_method={:?}", def_id);

12
compiler/rustc_trait_selection/src/traits/util.rs
View File

@ -268,10 +268,7 @@ pub fn count_own_vtable_entries<'tcx>(
tcx: TyCtxt<'tcx>,
trait_ref: ty::PolyTraitRef<'tcx>,
) -> usize {
let existential_trait_ref =
trait_ref.map_bound(|trait_ref| ty::ExistentialTraitRef::erase_self_ty(tcx, trait_ref));
let existential_trait_ref = tcx.erase_regions(existential_trait_ref);
tcx.own_existential_vtable_entries(existential_trait_ref).len()
tcx.own_existential_vtable_entries(trait_ref.def_id()).len()
}
/// Given an upcast trait object described by `object`, returns the
@ -282,15 +279,10 @@ pub fn get_vtable_index_of_object_method<'tcx, N>(
object: &super::ImplSourceObjectData<'tcx, N>,
method_def_id: DefId,
) -> Option<usize> {
let existential_trait_ref = object
.upcast_trait_ref
.map_bound(|trait_ref| ty::ExistentialTraitRef::erase_self_ty(tcx, trait_ref));
let existential_trait_ref = tcx.erase_regions(existential_trait_ref);
// Count number of methods preceding the one we are selecting and
// add them to the total offset.
if let Some(index) = tcx
.own_existential_vtable_entries(existential_trait_ref)
.own_existential_vtable_entries(object.upcast_trait_ref.def_id())
.iter()
.copied()
.position(|def_id| def_id == method_def_id)