bjoernager/rust
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Only compute vtable information during codegen

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This commit is contained in:
Michael Goulet 2024-06-14 20:35:45 -04:00
parent f8e5660532
commit 3b9adbec32
14 changed files with 141 additions and 195 deletions
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22
compiler/rustc_ty_utils/src/instance.rs
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@ -212,13 +212,23 @@ fn resolve_associated_item<'tcx>(
Some(ty::Instance::new(leaf_def.item.def_id, args))
}
traits::ImplSource::Builtin(BuiltinImplSource::Object { vtable_base }, _) => {
traits::get_vtable_index_of_object_method(tcx, *vtable_base, trait_item_id).map(
|index| Instance {
def: ty::InstanceDef::Virtual(trait_item_id, index),
traits::ImplSource::Builtin(BuiltinImplSource::Object(_), _) => {
let trait_ref = ty::TraitRef::from_method(tcx, trait_id, rcvr_args);
if trait_ref.has_non_region_infer() || trait_ref.has_non_region_param() {
// We only resolve totally substituted vtable entries.
None
} else {
let vtable_base = tcx.first_method_vtable_slot(trait_ref);
let offset = tcx
.own_existential_vtable_entries(trait_id)
.iter()
.copied()
.position(|def_id| def_id == trait_item_id);
offset.map(|offset| Instance {
def: ty::InstanceDef::Virtual(trait_item_id, vtable_base + offset),
args: rcvr_args,
},
)
})
}
}
traits::ImplSource::Builtin(BuiltinImplSource::Misc, _) => {
let lang_items = tcx.lang_items();