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Rollup merge of #125597 - compiler-errors:early-binder, r=jackh726

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Uplift `EarlyBinder` into `rustc_type_ir`

We also need to give `EarlyBinder` a `'tcx` param, so that we can carry the `Interner` in the `EarlyBinder` too. This is necessary because otherwise we have an unconstrained `I: Interner` parameter in many of the `EarlyBinder`'s inherent impls.

I also generally think that this is desirable to have, in case we later want to track some state in the `EarlyBinder`.

r? lcnr
This commit is contained in:
Guillaume Gomez 2024-05-27 13:10:36 +02:00 committed by GitHub
commit a9c125f864
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GPG Key ID: B5690EEEBB952194
43 changed files with 786 additions and 705 deletions
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1
Cargo.lock
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@ -4686,6 +4686,7 @@ dependencies = [
"rustc_span", "rustc_span",
"rustc_type_ir_macros", "rustc_type_ir_macros",
"smallvec", "smallvec",
"tracing",
] ]
[[package]] [[package]]

2
compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
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@ -449,7 +449,7 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {
pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>( pub(super) fn collect_return_position_impl_trait_in_trait_tys<'tcx>(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
impl_m_def_id: LocalDefId, impl_m_def_id: LocalDefId,
) -> Result<&'tcx DefIdMap<ty::EarlyBinder<Ty<'tcx>>>, ErrorGuaranteed> { ) -> Result<&'tcx DefIdMap<ty::EarlyBinder<'tcx, Ty<'tcx>>>, ErrorGuaranteed> {
let impl_m = tcx.opt_associated_item(impl_m_def_id.to_def_id()).unwrap(); let impl_m = tcx.opt_associated_item(impl_m_def_id.to_def_id()).unwrap();
let trait_m = tcx.opt_associated_item(impl_m.trait_item_def_id.unwrap()).unwrap(); let trait_m = tcx.opt_associated_item(impl_m.trait_item_def_id.unwrap()).unwrap();
let impl_trait_ref = let impl_trait_ref =

2
compiler/rustc_hir_analysis/src/collect.rs
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@ -1277,7 +1277,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::TraitDef {
} }
#[instrument(level = "debug", skip(tcx))] #[instrument(level = "debug", skip(tcx))]
fn fn_sig(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<ty::PolyFnSig<'_>> { fn fn_sig(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_, ty::PolyFnSig<'_>> {
use rustc_hir::Node::*; use rustc_hir::Node::*;
use rustc_hir::*; use rustc_hir::*;

12
compiler/rustc_hir_analysis/src/collect/item_bounds.rs
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@ -82,14 +82,14 @@ fn opaque_type_bounds<'tcx>(
pub(super) fn explicit_item_bounds( pub(super) fn explicit_item_bounds(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
def_id: LocalDefId, def_id: LocalDefId,
) -> ty::EarlyBinder<&'_ [(ty::Clause<'_>, Span)]> { ) -> ty::EarlyBinder<'_, &'_ [(ty::Clause<'_>, Span)]> {
explicit_item_bounds_with_filter(tcx, def_id, PredicateFilter::All) explicit_item_bounds_with_filter(tcx, def_id, PredicateFilter::All)
} }
pub(super) fn explicit_item_super_predicates( pub(super) fn explicit_item_super_predicates(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
def_id: LocalDefId, def_id: LocalDefId,
) -> ty::EarlyBinder<&'_ [(ty::Clause<'_>, Span)]> { ) -> ty::EarlyBinder<'_, &'_ [(ty::Clause<'_>, Span)]> {
explicit_item_bounds_with_filter(tcx, def_id, PredicateFilter::SelfOnly) explicit_item_bounds_with_filter(tcx, def_id, PredicateFilter::SelfOnly)
} }
@ -97,7 +97,7 @@ pub(super) fn explicit_item_bounds_with_filter(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
def_id: LocalDefId, def_id: LocalDefId,
filter: PredicateFilter, filter: PredicateFilter,
) -> ty::EarlyBinder<&'_ [(ty::Clause<'_>, Span)]> { ) -> ty::EarlyBinder<'_, &'_ [(ty::Clause<'_>, Span)]> {
match tcx.opt_rpitit_info(def_id.to_def_id()) { match tcx.opt_rpitit_info(def_id.to_def_id()) {
// RPITIT's bounds are the same as opaque type bounds, but with // RPITIT's bounds are the same as opaque type bounds, but with
// a projection self type. // a projection self type.
@ -166,7 +166,7 @@ pub(super) fn explicit_item_bounds_with_filter(
ty::EarlyBinder::bind(bounds) ty::EarlyBinder::bind(bounds)
} }
pub(super) fn item_bounds(tcx: TyCtxt<'_>, def_id: DefId) -> ty::EarlyBinder<ty::Clauses<'_>> { pub(super) fn item_bounds(tcx: TyCtxt<'_>, def_id: DefId) -> ty::EarlyBinder<'_, ty::Clauses<'_>> {
tcx.explicit_item_bounds(def_id).map_bound(|bounds| { tcx.explicit_item_bounds(def_id).map_bound(|bounds| {
tcx.mk_clauses_from_iter(util::elaborate(tcx, bounds.iter().map(|&(bound, _span)| bound))) tcx.mk_clauses_from_iter(util::elaborate(tcx, bounds.iter().map(|&(bound, _span)| bound)))
}) })
@ -175,7 +175,7 @@ pub(super) fn item_bounds(tcx: TyCtxt<'_>, def_id: DefId) -> ty::EarlyBinder<ty:
pub(super) fn item_super_predicates( pub(super) fn item_super_predicates(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
def_id: DefId, def_id: DefId,
) -> ty::EarlyBinder<ty::Clauses<'_>> { ) -> ty::EarlyBinder<'_, ty::Clauses<'_>> {
tcx.explicit_item_super_predicates(def_id).map_bound(|bounds| { tcx.explicit_item_super_predicates(def_id).map_bound(|bounds| {
tcx.mk_clauses_from_iter( tcx.mk_clauses_from_iter(
util::elaborate(tcx, bounds.iter().map(|&(bound, _span)| bound)).filter_only_self(), util::elaborate(tcx, bounds.iter().map(|&(bound, _span)| bound)).filter_only_self(),
@ -186,7 +186,7 @@ pub(super) fn item_super_predicates(
pub(super) fn item_non_self_assumptions( pub(super) fn item_non_self_assumptions(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
def_id: DefId, def_id: DefId,
) -> ty::EarlyBinder<ty::Clauses<'_>> { ) -> ty::EarlyBinder<'_, ty::Clauses<'_>> {
let all_bounds: FxIndexSet<_> = tcx.item_bounds(def_id).skip_binder().iter().collect(); let all_bounds: FxIndexSet<_> = tcx.item_bounds(def_id).skip_binder().iter().collect();
let own_bounds: FxIndexSet<_> = let own_bounds: FxIndexSet<_> =
tcx.item_super_predicates(def_id).skip_binder().iter().collect(); tcx.item_super_predicates(def_id).skip_binder().iter().collect();

4
compiler/rustc_hir_analysis/src/collect/type_of.rs
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@ -309,7 +309,7 @@ fn get_path_containing_arg_in_pat<'hir>(
arg_path arg_path
} }
pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<Ty<'_>> { pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_, Ty<'_>> {
use rustc_hir::*; use rustc_hir::*;
use rustc_middle::ty::Ty; use rustc_middle::ty::Ty;
@ -512,7 +512,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<Ty
pub(super) fn type_of_opaque( pub(super) fn type_of_opaque(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
def_id: DefId, def_id: DefId,
) -> Result<ty::EarlyBinder<Ty<'_>>, CyclePlaceholder> { ) -> Result<ty::EarlyBinder<'_, Ty<'_>>, CyclePlaceholder> {
if let Some(def_id) = def_id.as_local() { if let Some(def_id) = def_id.as_local() {
use rustc_hir::*; use rustc_hir::*;

4
compiler/rustc_hir_analysis/src/outlives/explicit.rs
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@ -6,7 +6,7 @@ use super::utils::*;
#[derive(Debug)] #[derive(Debug)]
pub struct ExplicitPredicatesMap<'tcx> { pub struct ExplicitPredicatesMap<'tcx> {
map: FxIndexMap<DefId, ty::EarlyBinder<RequiredPredicates<'tcx>>>, map: FxIndexMap<DefId, ty::EarlyBinder<'tcx, RequiredPredicates<'tcx>>>,
} }
impl<'tcx> ExplicitPredicatesMap<'tcx> { impl<'tcx> ExplicitPredicatesMap<'tcx> {
@ -18,7 +18,7 @@ impl<'tcx> ExplicitPredicatesMap<'tcx> {
&mut self, &mut self,
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
def_id: DefId, def_id: DefId,
) -> &ty::EarlyBinder<RequiredPredicates<'tcx>> { ) -> &ty::EarlyBinder<'tcx, RequiredPredicates<'tcx>> {
self.map.entry(def_id).or_insert_with(|| { self.map.entry(def_id).or_insert_with(|| {
let predicates = if def_id.is_local() { let predicates = if def_id.is_local() {
tcx.explicit_predicates_of(def_id) tcx.explicit_predicates_of(def_id)

6
compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs
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@ -15,7 +15,7 @@ use super::utils::*;
/// now be filled with inferred predicates. /// now be filled with inferred predicates.
pub(super) fn infer_predicates( pub(super) fn infer_predicates(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
) -> FxIndexMap<DefId, ty::EarlyBinder<RequiredPredicates<'_>>> { ) -> FxIndexMap<DefId, ty::EarlyBinder<'_, RequiredPredicates<'_>>> {
debug!("infer_predicates"); debug!("infer_predicates");
let mut explicit_map = ExplicitPredicatesMap::new(); let mut explicit_map = ExplicitPredicatesMap::new();
@ -101,7 +101,7 @@ fn insert_required_predicates_to_be_wf<'tcx>(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
ty: Ty<'tcx>, ty: Ty<'tcx>,
span: Span, span: Span,
global_inferred_outlives: &FxIndexMap<DefId, ty::EarlyBinder<RequiredPredicates<'tcx>>>, global_inferred_outlives: &FxIndexMap<DefId, ty::EarlyBinder<'tcx, RequiredPredicates<'tcx>>>,
required_predicates: &mut RequiredPredicates<'tcx>, required_predicates: &mut RequiredPredicates<'tcx>,
explicit_map: &mut ExplicitPredicatesMap<'tcx>, explicit_map: &mut ExplicitPredicatesMap<'tcx>,
) { ) {
@ -322,7 +322,7 @@ fn check_inferred_predicates<'tcx>(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
def_id: DefId, def_id: DefId,
args: ty::GenericArgsRef<'tcx>, args: ty::GenericArgsRef<'tcx>,
global_inferred_outlives: &FxIndexMap<DefId, ty::EarlyBinder<RequiredPredicates<'tcx>>>, global_inferred_outlives: &FxIndexMap<DefId, ty::EarlyBinder<'tcx, RequiredPredicates<'tcx>>>,
required_predicates: &mut RequiredPredicates<'tcx>, required_predicates: &mut RequiredPredicates<'tcx>,
) { ) {
// Load the current set of inferred and explicit predicates from `global_inferred_outlives` // Load the current set of inferred and explicit predicates from `global_inferred_outlives`

2
compiler/rustc_lint/src/non_local_def.rs
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@ -270,7 +270,7 @@ fn impl_trait_ref_has_enough_non_local_candidates<'tcx>(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
infer_span: Span, infer_span: Span,
trait_def_id: DefId, trait_def_id: DefId,
binder: EarlyBinder<TraitRef<'tcx>>, binder: EarlyBinder<'tcx, TraitRef<'tcx>>,
mut did_has_local_parent: impl FnMut(DefId) -> bool, mut did_has_local_parent: impl FnMut(DefId) -> bool,
) -> bool { ) -> bool {
let infcx = tcx let infcx = tcx

4
compiler/rustc_metadata/src/rmeta/decoder.rs
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@ -1074,7 +1074,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
self, self,
index: DefIndex, index: DefIndex,
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
) -> ty::EarlyBinder<&'tcx [(ty::Clause<'tcx>, Span)]> { ) -> ty::EarlyBinder<'tcx, &'tcx [(ty::Clause<'tcx>, Span)]> {
let lazy = self.root.tables.explicit_item_bounds.get(self, index); let lazy = self.root.tables.explicit_item_bounds.get(self, index);
let output = if lazy.is_default() { let output = if lazy.is_default() {
&mut [] &mut []
@ -1088,7 +1088,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
self, self,
index: DefIndex, index: DefIndex,
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
) -> ty::EarlyBinder<&'tcx [(ty::Clause<'tcx>, Span)]> { ) -> ty::EarlyBinder<'tcx, &'tcx [(ty::Clause<'tcx>, Span)]> {
let lazy = self.root.tables.explicit_item_super_predicates.get(self, index); let lazy = self.root.tables.explicit_item_super_predicates.get(self, index);
let output = if lazy.is_default() { let output = if lazy.is_default() {
&mut [] &mut []

10
compiler/rustc_metadata/src/rmeta/mod.rs
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@ -418,19 +418,19 @@ define_tables! {
// As an optimization, we only store this for trait aliases, // As an optimization, we only store this for trait aliases,
// since it's identical to super_predicates_of for traits. // since it's identical to super_predicates_of for traits.
implied_predicates_of: Table<DefIndex, LazyValue<ty::GenericPredicates<'static>>>, implied_predicates_of: Table<DefIndex, LazyValue<ty::GenericPredicates<'static>>>,
type_of: Table<DefIndex, LazyValue<ty::EarlyBinder<Ty<'static>>>>, type_of: Table<DefIndex, LazyValue<ty::EarlyBinder<'static, Ty<'static>>>>,
variances_of: Table<DefIndex, LazyArray<ty::Variance>>, variances_of: Table<DefIndex, LazyArray<ty::Variance>>,
fn_sig: Table<DefIndex, LazyValue<ty::EarlyBinder<ty::PolyFnSig<'static>>>>, fn_sig: Table<DefIndex, LazyValue<ty::EarlyBinder<'static, ty::PolyFnSig<'static>>>>,
codegen_fn_attrs: Table<DefIndex, LazyValue<CodegenFnAttrs>>, codegen_fn_attrs: Table<DefIndex, LazyValue<CodegenFnAttrs>>,
impl_trait_header: Table<DefIndex, LazyValue<ty::ImplTraitHeader<'static>>>, impl_trait_header: Table<DefIndex, LazyValue<ty::ImplTraitHeader<'static>>>,
const_param_default: Table<DefIndex, LazyValue<ty::EarlyBinder<rustc_middle::ty::Const<'static>>>>, const_param_default: Table<DefIndex, LazyValue<ty::EarlyBinder<'static, rustc_middle::ty::Const<'static>>>>,
object_lifetime_default: Table<DefIndex, LazyValue<ObjectLifetimeDefault>>, object_lifetime_default: Table<DefIndex, LazyValue<ObjectLifetimeDefault>>,
optimized_mir: Table<DefIndex, LazyValue<mir::Body<'static>>>, optimized_mir: Table<DefIndex, LazyValue<mir::Body<'static>>>,
mir_for_ctfe: Table<DefIndex, LazyValue<mir::Body<'static>>>, mir_for_ctfe: Table<DefIndex, LazyValue<mir::Body<'static>>>,
closure_saved_names_of_captured_variables: Table<DefIndex, LazyValue<IndexVec<FieldIdx, Symbol>>>, closure_saved_names_of_captured_variables: Table<DefIndex, LazyValue<IndexVec<FieldIdx, Symbol>>>,
mir_coroutine_witnesses: Table<DefIndex, LazyValue<mir::CoroutineLayout<'static>>>, mir_coroutine_witnesses: Table<DefIndex, LazyValue<mir::CoroutineLayout<'static>>>,
promoted_mir: Table<DefIndex, LazyValue<IndexVec<mir::Promoted, mir::Body<'static>>>>, promoted_mir: Table<DefIndex, LazyValue<IndexVec<mir::Promoted, mir::Body<'static>>>>,
thir_abstract_const: Table<DefIndex, LazyValue<ty::EarlyBinder<ty::Const<'static>>>>, thir_abstract_const: Table<DefIndex, LazyValue<ty::EarlyBinder<'static, ty::Const<'static>>>>,
impl_parent: Table<DefIndex, RawDefId>, impl_parent: Table<DefIndex, RawDefId>,
constness: Table<DefIndex, hir::Constness>, constness: Table<DefIndex, hir::Constness>,
defaultness: Table<DefIndex, hir::Defaultness>, defaultness: Table<DefIndex, hir::Defaultness>,
@ -459,7 +459,7 @@ define_tables! {
macro_definition: Table<DefIndex, LazyValue<ast::DelimArgs>>, macro_definition: Table<DefIndex, LazyValue<ast::DelimArgs>>,
proc_macro: Table<DefIndex, MacroKind>, proc_macro: Table<DefIndex, MacroKind>,
deduced_param_attrs: Table<DefIndex, LazyArray<DeducedParamAttrs>>, deduced_param_attrs: Table<DefIndex, LazyArray<DeducedParamAttrs>>,
trait_impl_trait_tys: Table<DefIndex, LazyValue<DefIdMap<ty::EarlyBinder<Ty<'static>>>>>, trait_impl_trait_tys: Table<DefIndex, LazyValue<DefIdMap<ty::EarlyBinder<'static, Ty<'static>>>>>,
doc_link_resolutions: Table<DefIndex, LazyValue<DocLinkResMap>>, doc_link_resolutions: Table<DefIndex, LazyValue<DocLinkResMap>>,
doc_link_traits_in_scope: Table<DefIndex, LazyArray<DefId>>, doc_link_traits_in_scope: Table<DefIndex, LazyArray<DefId>>,
assumed_wf_types_for_rpitit: Table<DefIndex, LazyArray<(Ty<'static>, Span)>>, assumed_wf_types_for_rpitit: Table<DefIndex, LazyArray<(Ty<'static>, Span)>>,

2
compiler/rustc_middle/src/arena.rs
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@ -108,7 +108,7 @@ macro_rules! arena_types {
[decode] trait_impl_trait_tys: [decode] trait_impl_trait_tys:
rustc_data_structures::unord::UnordMap< rustc_data_structures::unord::UnordMap<
rustc_hir::def_id::DefId, rustc_hir::def_id::DefId,
rustc_middle::ty::EarlyBinder<rustc_middle::ty::Ty<'tcx>> rustc_middle::ty::EarlyBinder<'tcx, rustc_middle::ty::Ty<'tcx>>
>, >,
[] external_constraints: rustc_middle::traits::solve::ExternalConstraintsData<'tcx>, [] external_constraints: rustc_middle::traits::solve::ExternalConstraintsData<'tcx>,
[] predefined_opaques_in_body: rustc_middle::traits::solve::PredefinedOpaquesData<'tcx>, [] predefined_opaques_in_body: rustc_middle::traits::solve::PredefinedOpaquesData<'tcx>,

2
compiler/rustc_middle/src/hir/mod.rs
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@ -121,7 +121,7 @@ impl<'tcx> TyCtxt<'tcx> {
LocalModDefId::new_unchecked(id) LocalModDefId::new_unchecked(id)
} }
pub fn impl_subject(self, def_id: DefId) -> EarlyBinder<ImplSubject<'tcx>> { pub fn impl_subject(self, def_id: DefId) -> EarlyBinder<'tcx, ImplSubject<'tcx>> {
match self.impl_trait_ref(def_id) { match self.impl_trait_ref(def_id) {
Some(t) => t.map_bound(ImplSubject::Trait), Some(t) => t.map_bound(ImplSubject::Trait),
None => self.type_of(def_id).map_bound(ImplSubject::Inherent), None => self.type_of(def_id).map_bound(ImplSubject::Inherent),

5
compiler/rustc_middle/src/mir/consts.rs
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@ -220,7 +220,10 @@ pub enum Const<'tcx> {
} }
impl<'tcx> Const<'tcx> { impl<'tcx> Const<'tcx> {
pub fn identity_unevaluated(tcx: TyCtxt<'tcx>, def_id: DefId) -> ty::EarlyBinder<Const<'tcx>> { pub fn identity_unevaluated(
tcx: TyCtxt<'tcx>,
def_id: DefId,
) -> ty::EarlyBinder<'tcx, Const<'tcx>> {
ty::EarlyBinder::bind(Const::Unevaluated( ty::EarlyBinder::bind(Const::Unevaluated(
UnevaluatedConst { UnevaluatedConst {
def: def_id, def: def_id,

2
compiler/rustc_middle/src/mir/mod.rs
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@ -624,7 +624,7 @@ impl<'tcx> Body<'tcx> {
/// Returns the return type; it always return first element from `local_decls` array. /// Returns the return type; it always return first element from `local_decls` array.
#[inline] #[inline]
pub fn bound_return_ty(&self) -> ty::EarlyBinder<Ty<'tcx>> { pub fn bound_return_ty(&self) -> ty::EarlyBinder<'tcx, Ty<'tcx>> {
ty::EarlyBinder::bind(self.local_decls[RETURN_PLACE].ty) ty::EarlyBinder::bind(self.local_decls[RETURN_PLACE].ty)
} }

16
compiler/rustc_middle/src/query/erase.rs
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@ -114,9 +114,11 @@ impl EraseType for Result<CoerceUnsizedInfo, rustc_errors::ErrorGuaranteed> {
type Result = [u8; size_of::<Result<CoerceUnsizedInfo, rustc_errors::ErrorGuaranteed>>()]; type Result = [u8; size_of::<Result<CoerceUnsizedInfo, rustc_errors::ErrorGuaranteed>>()];
} }
impl EraseType for Result<Option<ty::EarlyBinder<ty::Const<'_>>>, rustc_errors::ErrorGuaranteed> { impl EraseType
for Result<Option<ty::EarlyBinder<'_, ty::Const<'_>>>, rustc_errors::ErrorGuaranteed>
{
type Result = [u8; size_of::< type Result = [u8; size_of::<
Result<Option<ty::EarlyBinder<ty::Const<'static>>>, rustc_errors::ErrorGuaranteed>, Result<Option<ty::EarlyBinder<'static, ty::Const<'static>>>, rustc_errors::ErrorGuaranteed>,
>()]; >()];
} }
@ -165,8 +167,8 @@ impl EraseType for Result<&'_ ty::List<Ty<'_>>, ty::util::AlwaysRequiresDrop> {
[u8; size_of::<Result<&'static ty::List<Ty<'static>>, ty::util::AlwaysRequiresDrop>>()]; [u8; size_of::<Result<&'static ty::List<Ty<'static>>, ty::util::AlwaysRequiresDrop>>()];
} }
impl EraseType for Result<ty::EarlyBinder<Ty<'_>>, CyclePlaceholder> { impl EraseType for Result<ty::EarlyBinder<'_, Ty<'_>>, CyclePlaceholder> {
type Result = [u8; size_of::<Result<ty::EarlyBinder<Ty<'_>>, CyclePlaceholder>>()]; type Result = [u8; size_of::<Result<ty::EarlyBinder<'static, Ty<'_>>, CyclePlaceholder>>()];
} }
impl<T> EraseType for Option<&'_ T> { impl<T> EraseType for Option<&'_ T> {
@ -185,15 +187,15 @@ impl EraseType for Option<ty::ImplTraitHeader<'_>> {
type Result = [u8; size_of::<Option<ty::ImplTraitHeader<'static>>>()]; type Result = [u8; size_of::<Option<ty::ImplTraitHeader<'static>>>()];
} }
impl EraseType for Option<ty::EarlyBinder<Ty<'_>>> { impl EraseType for Option<ty::EarlyBinder<'_, Ty<'_>>> {
type Result = [u8; size_of::<Option<ty::EarlyBinder<Ty<'static>>>>()]; type Result = [u8; size_of::<Option<ty::EarlyBinder<'static, Ty<'static>>>>()];
} }
impl EraseType for rustc_hir::MaybeOwner<'_> { impl EraseType for rustc_hir::MaybeOwner<'_> {
type Result = [u8; size_of::<rustc_hir::MaybeOwner<'static>>()]; type Result = [u8; size_of::<rustc_hir::MaybeOwner<'static>>()];
} }
impl<T: EraseType> EraseType for ty::EarlyBinder<T> { impl<T: EraseType> EraseType for ty::EarlyBinder<'_, T> {
type Result = T::Result; type Result = T::Result;
} }

26
compiler/rustc_middle/src/query/mod.rs
View File

@ -209,7 +209,7 @@ rustc_queries! {
/// Given the def_id of a const-generic parameter, computes the associated default const /// Given the def_id of a const-generic parameter, computes the associated default const
/// parameter. e.g. `fn example<const N: usize=3>` called on `N` would return `3`. /// parameter. e.g. `fn example<const N: usize=3>` called on `N` would return `3`.
query const_param_default(param: DefId) -> ty::EarlyBinder<ty::Const<'tcx>> { query const_param_default(param: DefId) -> ty::EarlyBinder<'tcx, ty::Const<'tcx>> {
desc { |tcx| "computing const default for a given parameter `{}`", tcx.def_path_str(param) } desc { |tcx| "computing const default for a given parameter `{}`", tcx.def_path_str(param) }
cache_on_disk_if { param.is_local() } cache_on_disk_if { param.is_local() }
separate_provide_extern separate_provide_extern
@ -219,7 +219,7 @@ rustc_queries! {
/// to an alias, it will "skip" this alias to return the aliased type. /// to an alias, it will "skip" this alias to return the aliased type.
/// ///
/// [`DefId`]: rustc_hir::def_id::DefId /// [`DefId`]: rustc_hir::def_id::DefId
query type_of(key: DefId) -> ty::EarlyBinder<Ty<'tcx>> { query type_of(key: DefId) -> ty::EarlyBinder<'tcx, Ty<'tcx>> {
desc { |tcx| desc { |tcx|
"{action} `{path}`", "{action} `{path}`",
action = { action = {
@ -240,7 +240,7 @@ rustc_queries! {
/// Specialized instance of `type_of` that detects cycles that are due to /// Specialized instance of `type_of` that detects cycles that are due to
/// revealing opaque because of an auto trait bound. Unless `CyclePlaceholder` needs /// revealing opaque because of an auto trait bound. Unless `CyclePlaceholder` needs
/// to be handled separately, call `type_of` instead. /// to be handled separately, call `type_of` instead.
query type_of_opaque(key: DefId) -> Result<ty::EarlyBinder<Ty<'tcx>>, CyclePlaceholder> { query type_of_opaque(key: DefId) -> Result<ty::EarlyBinder<'tcx, Ty<'tcx>>, CyclePlaceholder> {
desc { |tcx| desc { |tcx|
"computing type of opaque `{path}`", "computing type of opaque `{path}`",
path = tcx.def_path_str(key), path = tcx.def_path_str(key),
@ -257,7 +257,7 @@ rustc_queries! {
} }
query collect_return_position_impl_trait_in_trait_tys(key: DefId) query collect_return_position_impl_trait_in_trait_tys(key: DefId)
-> Result<&'tcx DefIdMap<ty::EarlyBinder<Ty<'tcx>>>, ErrorGuaranteed> -> Result<&'tcx DefIdMap<ty::EarlyBinder<'tcx, Ty<'tcx>>>, ErrorGuaranteed>
{ {
desc { "comparing an impl and trait method signature, inferring any hidden `impl Trait` types in the process" } desc { "comparing an impl and trait method signature, inferring any hidden `impl Trait` types in the process" }
cache_on_disk_if { key.is_local() } cache_on_disk_if { key.is_local() }
@ -363,7 +363,7 @@ rustc_queries! {
/// `key` is the `DefId` of the associated type or opaque type. /// `key` is the `DefId` of the associated type or opaque type.
/// ///
/// Bounds from the parent (e.g. with nested impl trait) are not included. /// Bounds from the parent (e.g. with nested impl trait) are not included.
query explicit_item_bounds(key: DefId) -> ty::EarlyBinder<&'tcx [(ty::Clause<'tcx>, Span)]> { query explicit_item_bounds(key: DefId) -> ty::EarlyBinder<'tcx, &'tcx [(ty::Clause<'tcx>, Span)]> {
desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) } desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
cache_on_disk_if { key.is_local() } cache_on_disk_if { key.is_local() }
separate_provide_extern separate_provide_extern
@ -373,7 +373,7 @@ rustc_queries! {
/// share the `Self` type of the item. These are a subset of the bounds /// share the `Self` type of the item. These are a subset of the bounds
/// that may explicitly be used for things like closure signature /// that may explicitly be used for things like closure signature
/// deduction. /// deduction.
query explicit_item_super_predicates(key: DefId) -> ty::EarlyBinder<&'tcx [(ty::Clause<'tcx>, Span)]> { query explicit_item_super_predicates(key: DefId) -> ty::EarlyBinder<'tcx, &'tcx [(ty::Clause<'tcx>, Span)]> {
desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) } desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
cache_on_disk_if { key.is_local() } cache_on_disk_if { key.is_local() }
separate_provide_extern separate_provide_extern
@ -399,15 +399,15 @@ rustc_queries! {
/// ``` /// ```
/// ///
/// Bounds from the parent (e.g. with nested impl trait) are not included. /// Bounds from the parent (e.g. with nested impl trait) are not included.
query item_bounds(key: DefId) -> ty::EarlyBinder<ty::Clauses<'tcx>> { query item_bounds(key: DefId) -> ty::EarlyBinder<'tcx, ty::Clauses<'tcx>> {
desc { |tcx| "elaborating item bounds for `{}`", tcx.def_path_str(key) } desc { |tcx| "elaborating item bounds for `{}`", tcx.def_path_str(key) }
} }
query item_super_predicates(key: DefId) -> ty::EarlyBinder<ty::Clauses<'tcx>> { query item_super_predicates(key: DefId) -> ty::EarlyBinder<'tcx, ty::Clauses<'tcx>> {
desc { |tcx| "elaborating item assumptions for `{}`", tcx.def_path_str(key) } desc { |tcx| "elaborating item assumptions for `{}`", tcx.def_path_str(key) }
} }
query item_non_self_assumptions(key: DefId) -> ty::EarlyBinder<ty::Clauses<'tcx>> { query item_non_self_assumptions(key: DefId) -> ty::EarlyBinder<'tcx, ty::Clauses<'tcx>> {
desc { |tcx| "elaborating item assumptions for `{}`", tcx.def_path_str(key) } desc { |tcx| "elaborating item assumptions for `{}`", tcx.def_path_str(key) }
} }
@ -504,7 +504,7 @@ rustc_queries! {
/// Try to build an abstract representation of the given constant. /// Try to build an abstract representation of the given constant.
query thir_abstract_const( query thir_abstract_const(
key: DefId key: DefId
) -> Result<Option<ty::EarlyBinder<ty::Const<'tcx>>>, ErrorGuaranteed> { ) -> Result<Option<ty::EarlyBinder<'tcx, ty::Const<'tcx>>>, ErrorGuaranteed> {
desc { desc {
|tcx| "building an abstract representation for `{}`", tcx.def_path_str(key), |tcx| "building an abstract representation for `{}`", tcx.def_path_str(key),
} }
@ -704,7 +704,7 @@ rustc_queries! {
separate_provide_extern separate_provide_extern
} }
query adt_sized_constraint(key: DefId) -> Option<ty::EarlyBinder<Ty<'tcx>>> { query adt_sized_constraint(key: DefId) -> Option<ty::EarlyBinder<'tcx, Ty<'tcx>>> {
desc { |tcx| "computing the `Sized` constraint for `{}`", tcx.def_path_str(key) } desc { |tcx| "computing the `Sized` constraint for `{}`", tcx.def_path_str(key) }
} }
@ -849,7 +849,7 @@ rustc_queries! {
query self_ty_of_trait_impl_enabling_order_dep_trait_object_hack( query self_ty_of_trait_impl_enabling_order_dep_trait_object_hack(
key: DefId key: DefId
) -> Option<ty::EarlyBinder<ty::Ty<'tcx>>> { ) -> Option<ty::EarlyBinder<'tcx, ty::Ty<'tcx>>> {
desc { |tcx| "computing self type wrt issue #33140 `{}`", tcx.def_path_str(key) } desc { |tcx| "computing self type wrt issue #33140 `{}`", tcx.def_path_str(key) }
} }
@ -888,7 +888,7 @@ rustc_queries! {
} }
/// Computes the signature of the function. /// Computes the signature of the function.
query fn_sig(key: DefId) -> ty::EarlyBinder<ty::PolyFnSig<'tcx>> { query fn_sig(key: DefId) -> ty::EarlyBinder<'tcx, ty::PolyFnSig<'tcx>> {
desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) } desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }
cache_on_disk_if { key.is_local() } cache_on_disk_if { key.is_local() }
separate_provide_extern separate_provide_extern

2
compiler/rustc_middle/src/query/on_disk_cache.rs
View File

@ -752,7 +752,7 @@ impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for &'tcx UnordSet<LocalDefId>
} }
impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>>
for &'tcx UnordMap<DefId, ty::EarlyBinder<Ty<'tcx>>> for &'tcx UnordMap<DefId, ty::EarlyBinder<'tcx, Ty<'tcx>>>
{ {
#[inline] #[inline]
fn decode(d: &mut CacheDecoder<'a, 'tcx>) -> Self { fn decode(d: &mut CacheDecoder<'a, 'tcx>) -> Self {

3
compiler/rustc_middle/src/ty/abstract_const.rs
View File

@ -30,7 +30,8 @@ impl From<ErrorGuaranteed> for NotConstEvaluatable {
TrivialTypeTraversalImpls! { NotConstEvaluatable } TrivialTypeTraversalImpls! { NotConstEvaluatable }
pub type BoundAbstractConst<'tcx> = Result<Option<EarlyBinder<ty::Const<'tcx>>>, ErrorGuaranteed>; pub type BoundAbstractConst<'tcx> =
Result<Option<EarlyBinder<'tcx, ty::Const<'tcx>>>, ErrorGuaranteed>;
impl<'tcx> TyCtxt<'tcx> { impl<'tcx> TyCtxt<'tcx> {
pub fn expand_abstract_consts<T: TypeFoldable<TyCtxt<'tcx>>>(self, ac: T) -> T { pub fn expand_abstract_consts<T: TypeFoldable<TyCtxt<'tcx>>>(self, ac: T) -> T {

2
compiler/rustc_middle/src/ty/adt.rs
View File

@ -579,7 +579,7 @@ impl<'tcx> AdtDef<'tcx> {
/// Returns a type such that `Self: Sized` if and only if that type is `Sized`, /// Returns a type such that `Self: Sized` if and only if that type is `Sized`,
/// or `None` if the type is always sized. /// or `None` if the type is always sized.
pub fn sized_constraint(self, tcx: TyCtxt<'tcx>) -> Option<ty::EarlyBinder<Ty<'tcx>>> { pub fn sized_constraint(self, tcx: TyCtxt<'tcx>) -> Option<ty::EarlyBinder<'tcx, Ty<'tcx>>> {
if self.is_struct() { tcx.adt_sized_constraint(self.did()) } else { None } if self.is_struct() { tcx.adt_sized_constraint(self.did()) } else { None }
} }
} }

14
compiler/rustc_middle/src/ty/consts.rs
View File

@ -184,6 +184,15 @@ impl<'tcx> rustc_type_ir::inherent::Const<TyCtxt<'tcx>> for Const<'tcx> {
Const::new_var(tcx, vid, ty) Const::new_var(tcx, vid, ty)
} }
fn new_bound(
interner: TyCtxt<'tcx>,
debruijn: ty::DebruijnIndex,
var: ty::BoundVar,
ty: Ty<'tcx>,
) -> Self {
Const::new_bound(interner, debruijn, var, ty)
}
fn new_anon_bound( fn new_anon_bound(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
debruijn: ty::DebruijnIndex, debruijn: ty::DebruijnIndex,
@ -486,7 +495,10 @@ impl<'tcx> Const<'tcx> {
} }
} }
pub fn const_param_default(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<Const<'_>> { pub fn const_param_default<'tcx>(
tcx: TyCtxt<'tcx>,
def_id: LocalDefId,
) -> ty::EarlyBinder<'tcx, Const<'tcx>> {
let default_def_id = match tcx.hir_node_by_def_id(def_id) { let default_def_id = match tcx.hir_node_by_def_id(def_id) {
hir::Node::GenericParam(hir::GenericParam { hir::Node::GenericParam(hir::GenericParam {
kind: hir::GenericParamKind::Const { default: Some(ac), .. }, kind: hir::GenericParamKind::Const { default: Some(ac), .. },

8
compiler/rustc_middle/src/ty/context.rs
View File

@ -149,8 +149,8 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
self.generics_of(def_id) self.generics_of(def_id)
} }
fn type_of_instantiated(self, def_id: DefId, args: ty::GenericArgsRef<'tcx>) -> Ty<'tcx> { fn type_of(self, def_id: DefId) -> ty::EarlyBinder<'tcx, Ty<'tcx>> {
self.type_of(def_id).instantiate(self, args) self.type_of(def_id)
} }
fn alias_ty_kind(self, alias: ty::AliasTy<'tcx>) -> ty::AliasTyKind { fn alias_ty_kind(self, alias: ty::AliasTy<'tcx>) -> ty::AliasTyKind {
@ -679,7 +679,7 @@ impl<'tcx> TyCtxt<'tcx> {
/// In order to break cycles involving `AnonConst`, we need to set the expected type by side /// In order to break cycles involving `AnonConst`, we need to set the expected type by side
/// effect. However, we do not want this as a general capability, so this interface restricts /// effect. However, we do not want this as a general capability, so this interface restricts
/// to the only allowed case. /// to the only allowed case.
pub fn feed_anon_const_type(self, key: LocalDefId, value: ty::EarlyBinder<Ty<'tcx>>) { pub fn feed_anon_const_type(self, key: LocalDefId, value: ty::EarlyBinder<'tcx, Ty<'tcx>>) {
debug_assert_eq!(self.def_kind(key), DefKind::AnonConst); debug_assert_eq!(self.def_kind(key), DefKind::AnonConst);
TyCtxtFeed { tcx: self, key }.type_of(value) TyCtxtFeed { tcx: self, key }.type_of(value)
} }
@ -2741,7 +2741,7 @@ impl<'tcx> TyCtxt<'tcx> {
pub fn impl_trait_ref( pub fn impl_trait_ref(
self, self,
def_id: impl IntoQueryParam<DefId>, def_id: impl IntoQueryParam<DefId>,
) -> Option<ty::EarlyBinder<ty::TraitRef<'tcx>>> { ) -> Option<ty::EarlyBinder<'tcx, ty::TraitRef<'tcx>>> {
Some(self.impl_trait_header(def_id)?.trait_ref) Some(self.impl_trait_header(def_id)?.trait_ref)
} }

104
compiler/rustc_middle/src/ty/fold.rs
View File

@ -3,7 +3,9 @@ use rustc_data_structures::fx::FxIndexMap;
use rustc_hir::def_id::DefId; use rustc_hir::def_id::DefId;
use tracing::{debug, instrument}; use tracing::{debug, instrument};
pub use rustc_type_ir::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder, TypeSuperFoldable}; pub use rustc_type_ir::fold::{
shift_region, shift_vars, FallibleTypeFolder, TypeFoldable, TypeFolder, TypeSuperFoldable,
};
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
// Some sample folders // Some sample folders
@ -412,103 +414,3 @@ impl<'tcx> TyCtxt<'tcx> {
Binder::bind_with_vars(inner, bound_vars) Binder::bind_with_vars(inner, bound_vars)
} }
} }
///////////////////////////////////////////////////////////////////////////
// Shifter
//
// Shifts the De Bruijn indices on all escaping bound vars by a
// fixed amount. Useful in instantiation or when otherwise introducing
// a binding level that is not intended to capture the existing bound
// vars. See comment on `shift_vars_through_binders` method in
// `rustc_middle/src/ty/generic_args.rs` for more details.
struct Shifter<'tcx> {
tcx: TyCtxt<'tcx>,
current_index: ty::DebruijnIndex,
amount: u32,
}
impl<'tcx> Shifter<'tcx> {
pub fn new(tcx: TyCtxt<'tcx>, amount: u32) -> Self {
Shifter { tcx, current_index: ty::INNERMOST, amount }
}
}
impl<'tcx> TypeFolder<TyCtxt<'tcx>> for Shifter<'tcx> {
fn interner(&self) -> TyCtxt<'tcx> {
self.tcx
}
fn fold_binder<T: TypeFoldable<TyCtxt<'tcx>>>(
&mut self,
t: ty::Binder<'tcx, T>,
) -> ty::Binder<'tcx, T> {
self.current_index.shift_in(1);
let t = t.super_fold_with(self);
self.current_index.shift_out(1);
t
}
fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
match *r {
ty::ReBound(debruijn, br) if debruijn >= self.current_index => {
let debruijn = debruijn.shifted_in(self.amount);
ty::Region::new_bound(self.tcx, debruijn, br)
}
_ => r,
}
}
fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
match *ty.kind() {
ty::Bound(debruijn, bound_ty) if debruijn >= self.current_index => {
let debruijn = debruijn.shifted_in(self.amount);
Ty::new_bound(self.tcx, debruijn, bound_ty)
}
_ if ty.has_vars_bound_at_or_above(self.current_index) => ty.super_fold_with(self),
_ => ty,
}
}
fn fold_const(&mut self, ct: ty::Const<'tcx>) -> ty::Const<'tcx> {
if let ty::ConstKind::Bound(debruijn, bound_ct) = ct.kind()
&& debruijn >= self.current_index
{
let debruijn = debruijn.shifted_in(self.amount);
ty::Const::new_bound(self.tcx, debruijn, bound_ct, ct.ty())
} else {
ct.super_fold_with(self)
}
}
fn fold_predicate(&mut self, p: ty::Predicate<'tcx>) -> ty::Predicate<'tcx> {
if p.has_vars_bound_at_or_above(self.current_index) { p.super_fold_with(self) } else { p }
}
}
pub fn shift_region<'tcx>(
tcx: TyCtxt<'tcx>,
region: ty::Region<'tcx>,
amount: u32,
) -> ty::Region<'tcx> {
match *region {
ty::ReBound(debruijn, br) if amount > 0 => {
ty::Region::new_bound(tcx, debruijn.shifted_in(amount), br)
}
_ => region,
}
}
pub fn shift_vars<'tcx, T>(tcx: TyCtxt<'tcx>, value: T, amount: u32) -> T
where
T: TypeFoldable<TyCtxt<'tcx>>,
{
debug!("shift_vars(value={:?}, amount={})", value, amount);
if amount == 0 || !value.has_escaping_bound_vars() {
return value;
}
value.fold_with(&mut Shifter::new(tcx, amount))
}

496
compiler/rustc_middle/src/ty/generic_args.rs
View File

@ -1,10 +1,10 @@
// Generic arguments. // Generic arguments.
use crate::ty::codec::{TyDecoder, TyEncoder}; use crate::ty::codec::{TyDecoder, TyEncoder};
use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder, TypeSuperFoldable}; use crate::ty::fold::{FallibleTypeFolder, TypeFoldable};
use crate::ty::sty::{ClosureArgs, CoroutineArgs, CoroutineClosureArgs, InlineConstArgs}; use crate::ty::sty::{ClosureArgs, CoroutineArgs, CoroutineClosureArgs, InlineConstArgs};
use crate::ty::visit::{TypeVisitable, TypeVisitableExt, TypeVisitor}; use crate::ty::visit::{TypeVisitable, TypeVisitor};
use crate::ty::{self, Lift, List, ParamConst, Ty, TyCtxt}; use crate::ty::{self, Lift, List, Ty, TyCtxt};
use rustc_ast_ir::visit::VisitorResult; use rustc_ast_ir::visit::VisitorResult;
use rustc_ast_ir::walk_visitable_list; use rustc_ast_ir::walk_visitable_list;
@ -12,19 +12,15 @@ use rustc_data_structures::intern::Interned;
use rustc_errors::{DiagArgValue, IntoDiagArg}; use rustc_errors::{DiagArgValue, IntoDiagArg};
use rustc_hir::def_id::DefId; use rustc_hir::def_id::DefId;
use rustc_macros::extension; use rustc_macros::extension;
use rustc_macros::{ use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
Decodable, Encodable, HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable,
};
use rustc_serialize::{Decodable, Encodable}; use rustc_serialize::{Decodable, Encodable};
use rustc_type_ir::WithCachedTypeInfo; use rustc_type_ir::WithCachedTypeInfo;
use smallvec::SmallVec; use smallvec::SmallVec;
use tracing::debug;
use core::intrinsics; use core::intrinsics;
use std::marker::PhantomData; use std::marker::PhantomData;
use std::mem; use std::mem;
use std::num::NonZero; use std::num::NonZero;
use std::ops::Deref;
use std::ptr::NonNull; use std::ptr::NonNull;
pub type GenericArgKind<'tcx> = rustc_type_ir::GenericArgKind<TyCtxt<'tcx>>; pub type GenericArgKind<'tcx> = rustc_type_ir::GenericArgKind<TyCtxt<'tcx>>;
@ -576,490 +572,6 @@ impl<'tcx, T: TypeVisitable<TyCtxt<'tcx>>> TypeVisitable<TyCtxt<'tcx>> for &'tcx
} }
} }
/// Similar to [`super::Binder`] except that it tracks early bound generics, i.e. `struct Foo<T>(T)`
/// needs `T` instantiated immediately. This type primarily exists to avoid forgetting to call
/// `instantiate`.
///
/// If you don't have anything to `instantiate`, you may be looking for
/// [`instantiate_identity`](EarlyBinder::instantiate_identity) or [`skip_binder`](EarlyBinder::skip_binder).
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
#[derive(Encodable, Decodable, HashStable)]
pub struct EarlyBinder<T> {
value: T,
}
/// For early binders, you should first call `instantiate` before using any visitors.
impl<'tcx, T> !TypeFoldable<TyCtxt<'tcx>> for ty::EarlyBinder<T> {}
impl<'tcx, T> !TypeVisitable<TyCtxt<'tcx>> for ty::EarlyBinder<T> {}
impl<T> EarlyBinder<T> {
pub fn bind(value: T) -> EarlyBinder<T> {
EarlyBinder { value }
}
pub fn as_ref(&self) -> EarlyBinder<&T> {
EarlyBinder { value: &self.value }
}
pub fn map_bound_ref<F, U>(&self, f: F) -> EarlyBinder<U>
where
F: FnOnce(&T) -> U,
{
self.as_ref().map_bound(f)
}
pub fn map_bound<F, U>(self, f: F) -> EarlyBinder<U>
where
F: FnOnce(T) -> U,
{
let value = f(self.value);
EarlyBinder { value }
}
pub fn try_map_bound<F, U, E>(self, f: F) -> Result<EarlyBinder<U>, E>
where
F: FnOnce(T) -> Result<U, E>,
{
let value = f(self.value)?;
Ok(EarlyBinder { value })
}
pub fn rebind<U>(&self, value: U) -> EarlyBinder<U> {
EarlyBinder { value }
}
/// Skips the binder and returns the "bound" value.
/// This can be used to extract data that does not depend on generic parameters
/// (e.g., getting the `DefId` of the inner value or getting the number of
/// arguments of an `FnSig`). Otherwise, consider using
/// [`instantiate_identity`](EarlyBinder::instantiate_identity).
///
/// To skip the binder on `x: &EarlyBinder<T>` to obtain `&T`, leverage
/// [`EarlyBinder::as_ref`](EarlyBinder::as_ref): `x.as_ref().skip_binder()`.
///
/// See also [`Binder::skip_binder`](super::Binder::skip_binder), which is
/// the analogous operation on [`super::Binder`].
pub fn skip_binder(self) -> T {
self.value
}
}
impl<T> EarlyBinder<Option<T>> {
pub fn transpose(self) -> Option<EarlyBinder<T>> {
self.value.map(|value| EarlyBinder { value })
}
}
impl<'tcx, 's, I: IntoIterator> EarlyBinder<I>
where
I::Item: TypeFoldable<TyCtxt<'tcx>>,
{
pub fn iter_instantiated(
self,
tcx: TyCtxt<'tcx>,
args: &'s [GenericArg<'tcx>],
) -> IterInstantiated<'s, 'tcx, I> {
IterInstantiated { it: self.value.into_iter(), tcx, args }
}
/// Similar to [`instantiate_identity`](EarlyBinder::instantiate_identity),
/// but on an iterator of `TypeFoldable` values.
pub fn instantiate_identity_iter(self) -> I::IntoIter {
self.value.into_iter()
}
}
pub struct IterInstantiated<'s, 'tcx, I: IntoIterator> {
it: I::IntoIter,
tcx: TyCtxt<'tcx>,
args: &'s [GenericArg<'tcx>],
}
impl<'tcx, I: IntoIterator> Iterator for IterInstantiated<'_, 'tcx, I>
where
I::Item: TypeFoldable<TyCtxt<'tcx>>,
{
type Item = I::Item;
fn next(&mut self) -> Option<Self::Item> {
Some(EarlyBinder { value: self.it.next()? }.instantiate(self.tcx, self.args))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}
impl<'tcx, I: IntoIterator> DoubleEndedIterator for IterInstantiated<'_, 'tcx, I>
where
I::IntoIter: DoubleEndedIterator,
I::Item: TypeFoldable<TyCtxt<'tcx>>,
{
fn next_back(&mut self) -> Option<Self::Item> {
Some(EarlyBinder { value: self.it.next_back()? }.instantiate(self.tcx, self.args))
}
}
impl<'tcx, I: IntoIterator> ExactSizeIterator for IterInstantiated<'_, 'tcx, I>
where
I::IntoIter: ExactSizeIterator,
I::Item: TypeFoldable<TyCtxt<'tcx>>,
{
}
impl<'tcx, 's, I: IntoIterator> EarlyBinder<I>
where
I::Item: Deref,
<I::Item as Deref>::Target: Copy + TypeFoldable<TyCtxt<'tcx>>,
{
pub fn iter_instantiated_copied(
self,
tcx: TyCtxt<'tcx>,
args: &'s [GenericArg<'tcx>],
) -> IterInstantiatedCopied<'s, 'tcx, I> {
IterInstantiatedCopied { it: self.value.into_iter(), tcx, args }
}
/// Similar to [`instantiate_identity`](EarlyBinder::instantiate_identity),
/// but on an iterator of values that deref to a `TypeFoldable`.
pub fn instantiate_identity_iter_copied(
self,
) -> impl Iterator<Item = <I::Item as Deref>::Target> {
self.value.into_iter().map(|v| *v)
}
}
pub struct IterInstantiatedCopied<'a, 'tcx, I: IntoIterator> {
it: I::IntoIter,
tcx: TyCtxt<'tcx>,
args: &'a [GenericArg<'tcx>],
}
impl<'tcx, I: IntoIterator> Iterator for IterInstantiatedCopied<'_, 'tcx, I>
where
I::Item: Deref,
<I::Item as Deref>::Target: Copy + TypeFoldable<TyCtxt<'tcx>>,
{
type Item = <I::Item as Deref>::Target;
fn next(&mut self) -> Option<Self::Item> {
self.it.next().map(|value| EarlyBinder { value: *value }.instantiate(self.tcx, self.args))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}
impl<'tcx, I: IntoIterator> DoubleEndedIterator for IterInstantiatedCopied<'_, 'tcx, I>
where
I::IntoIter: DoubleEndedIterator,
I::Item: Deref,
<I::Item as Deref>::Target: Copy + TypeFoldable<TyCtxt<'tcx>>,
{
fn next_back(&mut self) -> Option<Self::Item> {
self.it
.next_back()
.map(|value| EarlyBinder { value: *value }.instantiate(self.tcx, self.args))
}
}
impl<'tcx, I: IntoIterator> ExactSizeIterator for IterInstantiatedCopied<'_, 'tcx, I>
where
I::IntoIter: ExactSizeIterator,
I::Item: Deref,
<I::Item as Deref>::Target: Copy + TypeFoldable<TyCtxt<'tcx>>,
{
}
pub struct EarlyBinderIter<T> {
t: T,
}
impl<T: IntoIterator> EarlyBinder<T> {
pub fn transpose_iter(self) -> EarlyBinderIter<T::IntoIter> {
EarlyBinderIter { t: self.value.into_iter() }
}
}
impl<T: Iterator> Iterator for EarlyBinderIter<T> {
type Item = EarlyBinder<T::Item>;
fn next(&mut self) -> Option<Self::Item> {
self.t.next().map(|value| EarlyBinder { value })
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.t.size_hint()
}
}
impl<'tcx, T: TypeFoldable<TyCtxt<'tcx>>> ty::EarlyBinder<T> {
pub fn instantiate(self, tcx: TyCtxt<'tcx>, args: &[GenericArg<'tcx>]) -> T {
let mut folder = ArgFolder { tcx, args, binders_passed: 0 };
self.value.fold_with(&mut folder)
}
/// Makes the identity replacement `T0 => T0, ..., TN => TN`.
/// Conceptually, this converts universally bound variables into placeholders
/// when inside of a given item.
///
/// For example, consider `for<T> fn foo<T>(){ .. }`:
/// - Outside of `foo`, `T` is bound (represented by the presence of `EarlyBinder`).
/// - Inside of the body of `foo`, we treat `T` as a placeholder by calling
/// `instantiate_identity` to discharge the `EarlyBinder`.
pub fn instantiate_identity(self) -> T {
self.value
}
/// Returns the inner value, but only if it contains no bound vars.
pub fn no_bound_vars(self) -> Option<T> {
if !self.value.has_param() { Some(self.value) } else { None }
}
}
///////////////////////////////////////////////////////////////////////////
// The actual instantiation engine itself is a type folder.
struct ArgFolder<'a, 'tcx> {
tcx: TyCtxt<'tcx>,
args: &'a [GenericArg<'tcx>],
/// Number of region binders we have passed through while doing the instantiation
binders_passed: u32,
}
impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for ArgFolder<'a, 'tcx> {
#[inline]
fn interner(&self) -> TyCtxt<'tcx> {
self.tcx
}
fn fold_binder<T: TypeFoldable<TyCtxt<'tcx>>>(
&mut self,
t: ty::Binder<'tcx, T>,
) -> ty::Binder<'tcx, T> {
self.binders_passed += 1;
let t = t.super_fold_with(self);
self.binders_passed -= 1;
t
}
fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
#[cold]
#[inline(never)]
fn region_param_out_of_range(data: ty::EarlyParamRegion, args: &[GenericArg<'_>]) -> ! {
bug!(
"Region parameter out of range when instantiating in region {} (index={}, args = {:?})",
data.name,
data.index,
args,
)
}
#[cold]
#[inline(never)]
fn region_param_invalid(data: ty::EarlyParamRegion, other: GenericArgKind<'_>) -> ! {
bug!(
"Unexpected parameter {:?} when instantiating in region {} (index={})",
other,
data.name,
data.index
)
}
// Note: This routine only handles regions that are bound on
// type declarations and other outer declarations, not those
// bound in *fn types*. Region instantiation of the bound
// regions that appear in a function signature is done using
// the specialized routine `ty::replace_late_regions()`.
match *r {
ty::ReEarlyParam(data) => {
let rk = self.args.get(data.index as usize).map(|k| k.unpack());
match rk {
Some(GenericArgKind::Lifetime(lt)) => self.shift_region_through_binders(lt),
Some(other) => region_param_invalid(data, other),
None => region_param_out_of_range(data, self.args),
}
}
ty::ReBound(..)
| ty::ReLateParam(_)
| ty::ReStatic
| ty::RePlaceholder(_)
| ty::ReErased
| ty::ReError(_) => r,
ty::ReVar(_) => bug!("unexpected region: {r:?}"),
}
}
fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
if !t.has_param() {
return t;
}
match *t.kind() {
ty::Param(p) => self.ty_for_param(p, t),
_ => t.super_fold_with(self),
}
}
fn fold_const(&mut self, c: ty::Const<'tcx>) -> ty::Const<'tcx> {
if let ty::ConstKind::Param(p) = c.kind() {
self.const_for_param(p, c)
} else {
c.super_fold_with(self)
}
}
}
impl<'a, 'tcx> ArgFolder<'a, 'tcx> {
fn ty_for_param(&self, p: ty::ParamTy, source_ty: Ty<'tcx>) -> Ty<'tcx> {
// Look up the type in the args. It really should be in there.
let opt_ty = self.args.get(p.index as usize).map(|k| k.unpack());
let ty = match opt_ty {
Some(GenericArgKind::Type(ty)) => ty,
Some(kind) => self.type_param_expected(p, source_ty, kind),
None => self.type_param_out_of_range(p, source_ty),
};
self.shift_vars_through_binders(ty)
}
#[cold]
#[inline(never)]
fn type_param_expected(&self, p: ty::ParamTy, ty: Ty<'tcx>, kind: GenericArgKind<'tcx>) -> ! {
bug!(
"expected type for `{:?}` ({:?}/{}) but found {:?} when instantiating, args={:?}",
p,
ty,
p.index,
kind,
self.args,
)
}
#[cold]
#[inline(never)]
fn type_param_out_of_range(&self, p: ty::ParamTy, ty: Ty<'tcx>) -> ! {
bug!(
"type parameter `{:?}` ({:?}/{}) out of range when instantiating, args={:?}",
p,
ty,
p.index,
self.args,
)
}
fn const_for_param(&self, p: ParamConst, source_ct: ty::Const<'tcx>) -> ty::Const<'tcx> {
// Look up the const in the args. It really should be in there.
let opt_ct = self.args.get(p.index as usize).map(|k| k.unpack());
let ct = match opt_ct {
Some(GenericArgKind::Const(ct)) => ct,
Some(kind) => self.const_param_expected(p, source_ct, kind),
None => self.const_param_out_of_range(p, source_ct),
};
self.shift_vars_through_binders(ct)
}
#[cold]
#[inline(never)]
fn const_param_expected(
&self,
p: ty::ParamConst,
ct: ty::Const<'tcx>,
kind: GenericArgKind<'tcx>,
) -> ! {
bug!(
"expected const for `{:?}` ({:?}/{}) but found {:?} when instantiating args={:?}",
p,
ct,
p.index,
kind,
self.args,
)
}
#[cold]
#[inline(never)]
fn const_param_out_of_range(&self, p: ty::ParamConst, ct: ty::Const<'tcx>) -> ! {
bug!(
"const parameter `{:?}` ({:?}/{}) out of range when instantiating args={:?}",
p,
ct,
p.index,
self.args,
)
}
/// It is sometimes necessary to adjust the De Bruijn indices during instantiation. This occurs
/// when we are instantating a type with escaping bound vars into a context where we have
/// passed through binders. That's quite a mouthful. Let's see an example:
///
/// ```
/// type Func<A> = fn(A);
/// type MetaFunc = for<'a> fn(Func<&'a i32>);
/// ```
///
/// The type `MetaFunc`, when fully expanded, will be
/// ```ignore (illustrative)
/// for<'a> fn(fn(&'a i32))
/// // ^~ ^~ ^~~
/// // | | |
/// // | | DebruijnIndex of 2
/// // Binders
/// ```
/// Here the `'a` lifetime is bound in the outer function, but appears as an argument of the
/// inner one. Therefore, that appearance will have a DebruijnIndex of 2, because we must skip
/// over the inner binder (remember that we count De Bruijn indices from 1). However, in the
/// definition of `MetaFunc`, the binder is not visible, so the type `&'a i32` will have a
/// De Bruijn index of 1. It's only during the instantiation that we can see we must increase the
/// depth by 1 to account for the binder that we passed through.
///
/// As a second example, consider this twist:
///
/// ```
/// type FuncTuple<A> = (A,fn(A));
/// type MetaFuncTuple = for<'a> fn(FuncTuple<&'a i32>);
/// ```
///
/// Here the final type will be:
/// ```ignore (illustrative)
/// for<'a> fn((&'a i32, fn(&'a i32)))
/// // ^~~ ^~~
/// // | |
/// // DebruijnIndex of 1 |
/// // DebruijnIndex of 2
/// ```
/// As indicated in the diagram, here the same type `&'a i32` is instantiated once, but in the
/// first case we do not increase the De Bruijn index and in the second case we do. The reason
/// is that only in the second case have we passed through a fn binder.
fn shift_vars_through_binders<T: TypeFoldable<TyCtxt<'tcx>>>(&self, val: T) -> T {
debug!(
"shift_vars(val={:?}, binders_passed={:?}, has_escaping_bound_vars={:?})",
val,
self.binders_passed,
val.has_escaping_bound_vars()
);
if self.binders_passed == 0 || !val.has_escaping_bound_vars() {
return val;
}
let result = ty::fold::shift_vars(TypeFolder::interner(self), val, self.binders_passed);
debug!("shift_vars: shifted result = {:?}", result);
result
}
fn shift_region_through_binders(&self, region: ty::Region<'tcx>) -> ty::Region<'tcx> {
if self.binders_passed == 0 || !region.has_escaping_bound_vars() {
return region;
}
ty::fold::shift_region(self.tcx, region, self.binders_passed)
}
}
/// Stores the user-given args to reach some fully qualified path /// Stores the user-given args to reach some fully qualified path
/// (e.g., `<T>::Item` or `<T as Trait>::Item`). /// (e.g., `<T>::Item` or `<T as Trait>::Item`).
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable)] #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable)]

2
compiler/rustc_middle/src/ty/generics.rs
View File

@ -88,7 +88,7 @@ impl GenericParamDef {
pub fn default_value<'tcx>( pub fn default_value<'tcx>(
&self, &self,
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
) -> Option<EarlyBinder<ty::GenericArg<'tcx>>> { ) -> Option<EarlyBinder<'tcx, ty::GenericArg<'tcx>>> {
match self.kind { match self.kind {
GenericParamDefKind::Type { has_default, .. } if has_default => { GenericParamDefKind::Type { has_default, .. } if has_default => {
Some(tcx.type_of(self.def_id).map_bound(|t| t.into())) Some(tcx.type_of(self.def_id).map_bound(|t| t.into()))

6
compiler/rustc_middle/src/ty/instance.rs
View File

@ -764,7 +764,7 @@ impl<'tcx> Instance<'tcx> {
self.def.has_polymorphic_mir_body().then_some(self.args) self.def.has_polymorphic_mir_body().then_some(self.args)
} }
pub fn instantiate_mir<T>(&self, tcx: TyCtxt<'tcx>, v: EarlyBinder<&T>) -> T pub fn instantiate_mir<T>(&self, tcx: TyCtxt<'tcx>, v: EarlyBinder<'tcx, &T>) -> T
where where
T: TypeFoldable<TyCtxt<'tcx>> + Copy, T: TypeFoldable<TyCtxt<'tcx>> + Copy,
{ {
@ -782,7 +782,7 @@ impl<'tcx> Instance<'tcx> {
&self, &self,
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>, param_env: ty::ParamEnv<'tcx>,
v: EarlyBinder<T>, v: EarlyBinder<'tcx, T>,
) -> T ) -> T
where where
T: TypeFoldable<TyCtxt<'tcx>>, T: TypeFoldable<TyCtxt<'tcx>>,
@ -800,7 +800,7 @@ impl<'tcx> Instance<'tcx> {
&self, &self,
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>, param_env: ty::ParamEnv<'tcx>,
v: EarlyBinder<T>, v: EarlyBinder<'tcx, T>,
) -> Result<T, NormalizationError<'tcx>> ) -> Result<T, NormalizationError<'tcx>>
where where
T: TypeFoldable<TyCtxt<'tcx>>, T: TypeFoldable<TyCtxt<'tcx>>,

8
compiler/rustc_middle/src/ty/mod.rs
View File

@ -114,9 +114,9 @@ pub use self::rvalue_scopes::RvalueScopes;
pub use self::sty::{ pub use self::sty::{
AliasTy, Article, Binder, BoundTy, BoundTyKind, BoundVariableKind, CanonicalPolyFnSig, AliasTy, Article, Binder, BoundTy, BoundTyKind, BoundVariableKind, CanonicalPolyFnSig,
ClosureArgs, ClosureArgsParts, CoroutineArgs, CoroutineArgsParts, CoroutineClosureArgs, ClosureArgs, ClosureArgsParts, CoroutineArgs, CoroutineArgsParts, CoroutineClosureArgs,
CoroutineClosureArgsParts, CoroutineClosureSignature, FnSig, GenSig, InlineConstArgs, CoroutineClosureArgsParts, CoroutineClosureSignature, EarlyBinder, FnSig, GenSig,
InlineConstArgsParts, ParamConst, ParamTy, PolyFnSig, TyKind, TypeAndMut, UpvarArgs, InlineConstArgs, InlineConstArgsParts, ParamConst, ParamTy, PolyFnSig, TyKind, TypeAndMut,
VarianceDiagInfo, UpvarArgs, VarianceDiagInfo,
}; };
pub use self::trait_def::TraitDef; pub use self::trait_def::TraitDef;
pub use self::typeck_results::{ pub use self::typeck_results::{
@ -266,7 +266,7 @@ pub struct ImplHeader<'tcx> {
#[derive(Copy, Clone, Debug, TyEncodable, TyDecodable, HashStable)] #[derive(Copy, Clone, Debug, TyEncodable, TyDecodable, HashStable)]
pub struct ImplTraitHeader<'tcx> { pub struct ImplTraitHeader<'tcx> {
pub trait_ref: ty::EarlyBinder<ty::TraitRef<'tcx>>, pub trait_ref: ty::EarlyBinder<'tcx, ty::TraitRef<'tcx>>,
pub polarity: ImplPolarity, pub polarity: ImplPolarity,
pub safety: hir::Safety, pub safety: hir::Safety,
} }

4
compiler/rustc_middle/src/ty/normalize_erasing_regions.rs
View File

@ -125,7 +125,7 @@ impl<'tcx> TyCtxt<'tcx> {
self, self,
param_args: GenericArgsRef<'tcx>, param_args: GenericArgsRef<'tcx>,
param_env: ty::ParamEnv<'tcx>, param_env: ty::ParamEnv<'tcx>,
value: EarlyBinder<T>, value: EarlyBinder<'tcx, T>,
) -> T ) -> T
where where
T: TypeFoldable<TyCtxt<'tcx>>, T: TypeFoldable<TyCtxt<'tcx>>,
@ -143,7 +143,7 @@ impl<'tcx> TyCtxt<'tcx> {
self, self,
param_args: GenericArgsRef<'tcx>, param_args: GenericArgsRef<'tcx>,
param_env: ty::ParamEnv<'tcx>, param_env: ty::ParamEnv<'tcx>,
value: EarlyBinder<T>, value: EarlyBinder<'tcx, T>,
) -> Result<T, NormalizationError<'tcx>> ) -> Result<T, NormalizationError<'tcx>>
where where
T: TypeFoldable<TyCtxt<'tcx>>, T: TypeFoldable<TyCtxt<'tcx>>,

4
compiler/rustc_middle/src/ty/parameterized.rs
View File

@ -33,8 +33,8 @@ impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::Binder<'static, T> {
type Value<'tcx> = ty::Binder<'tcx, T::Value<'tcx>>; type Value<'tcx> = ty::Binder<'tcx, T::Value<'tcx>>;
} }
impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::EarlyBinder<T> { impl<T: ParameterizedOverTcx> ParameterizedOverTcx for ty::EarlyBinder<'static, T> {
type Value<'tcx> = ty::EarlyBinder<T::Value<'tcx>>; type Value<'tcx> = ty::EarlyBinder<'tcx, T::Value<'tcx>>;
} }
#[macro_export] #[macro_export]

14
compiler/rustc_middle/src/ty/region.rs
View File

@ -138,6 +138,14 @@ impl<'tcx> Region<'tcx> {
} }
impl<'tcx> rustc_type_ir::inherent::Region<TyCtxt<'tcx>> for Region<'tcx> { impl<'tcx> rustc_type_ir::inherent::Region<TyCtxt<'tcx>> for Region<'tcx> {
fn new_bound(
interner: TyCtxt<'tcx>,
debruijn: ty::DebruijnIndex,
var: ty::BoundRegion,
) -> Self {
Region::new_bound(interner, debruijn, var)
}
fn new_anon_bound(tcx: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self { fn new_anon_bound(tcx: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self {
Region::new_bound(tcx, debruijn, ty::BoundRegion { var, kind: ty::BoundRegionKind::BrAnon }) Region::new_bound(tcx, debruijn, ty::BoundRegion { var, kind: ty::BoundRegionKind::BrAnon })
} }
@ -327,6 +335,12 @@ pub struct EarlyParamRegion {
pub name: Symbol, pub name: Symbol,
} }
impl rustc_type_ir::inherent::ParamLike for EarlyParamRegion {
fn index(self) -> u32 {
self.index
}
}
impl std::fmt::Debug for EarlyParamRegion { impl std::fmt::Debug for EarlyParamRegion {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}/#{}", self.name, self.index) write!(f, "{}/#{}", self.name, self.index)

19
compiler/rustc_middle/src/ty/sty.rs
View File

@ -40,6 +40,7 @@ pub type TypeAndMut<'tcx> = ir::TypeAndMut<TyCtxt<'tcx>>;
pub type AliasTy<'tcx> = ir::AliasTy<TyCtxt<'tcx>>; pub type AliasTy<'tcx> = ir::AliasTy<TyCtxt<'tcx>>;
pub type FnSig<'tcx> = ir::FnSig<TyCtxt<'tcx>>; pub type FnSig<'tcx> = ir::FnSig<TyCtxt<'tcx>>;
pub type Binder<'tcx, T> = ir::Binder<TyCtxt<'tcx>, T>; pub type Binder<'tcx, T> = ir::Binder<TyCtxt<'tcx>, T>;
pub type EarlyBinder<'tcx, T> = ir::EarlyBinder<TyCtxt<'tcx>, T>;
pub trait Article { pub trait Article {
fn article(&self) -> &'static str; fn article(&self) -> &'static str;
@ -954,6 +955,12 @@ pub struct ParamTy {
pub name: Symbol, pub name: Symbol,
} }
impl rustc_type_ir::inherent::ParamLike for ParamTy {
fn index(self) -> u32 {
self.index
}
}
impl<'tcx> ParamTy { impl<'tcx> ParamTy {
pub fn new(index: u32, name: Symbol) -> ParamTy { pub fn new(index: u32, name: Symbol) -> ParamTy {
ParamTy { index, name } ParamTy { index, name }
@ -982,6 +989,12 @@ pub struct ParamConst {
pub name: Symbol, pub name: Symbol,
} }
impl rustc_type_ir::inherent::ParamLike for ParamConst {
fn index(self) -> u32 {
self.index
}
}
impl ParamConst { impl ParamConst {
pub fn new(index: u32, name: Symbol) -> ParamConst { pub fn new(index: u32, name: Symbol) -> ParamConst {
ParamConst { index, name } ParamConst { index, name }
@ -1423,6 +1436,10 @@ impl<'tcx> rustc_type_ir::inherent::Ty<TyCtxt<'tcx>> for Ty<'tcx> {
Ty::new_var(tcx, vid) Ty::new_var(tcx, vid)
} }
fn new_bound(interner: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundTy) -> Self {
Ty::new_bound(interner, debruijn, var)
}
fn new_anon_bound(tcx: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self { fn new_anon_bound(tcx: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self {
Ty::new_bound(tcx, debruijn, ty::BoundTy { var, kind: ty::BoundTyKind::Anon }) Ty::new_bound(tcx, debruijn, ty::BoundTy { var, kind: ty::BoundTyKind::Anon })
} }
@ -2055,7 +2072,7 @@ impl<'tcx> Ty<'tcx> {
fn async_destructor_combinator( fn async_destructor_combinator(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
lang_item: LangItem, lang_item: LangItem,
) -> ty::EarlyBinder<Ty<'tcx>> { ) -> ty::EarlyBinder<'tcx, Ty<'tcx>> {
tcx.fn_sig(tcx.require_lang_item(lang_item, None)) tcx.fn_sig(tcx.require_lang_item(lang_item, None))
.map_bound(|fn_sig| fn_sig.output().no_bound_vars().unwrap()) .map_bound(|fn_sig| fn_sig.output().no_bound_vars().unwrap())
} }

4
compiler/rustc_middle/src/ty/util.rs
View File

@ -694,7 +694,7 @@ impl<'tcx> TyCtxt<'tcx> {
pub fn coroutine_hidden_types( pub fn coroutine_hidden_types(
self, self,
def_id: DefId, def_id: DefId,
) -> impl Iterator<Item = ty::EarlyBinder<Ty<'tcx>>> { ) -> impl Iterator<Item = ty::EarlyBinder<'tcx, Ty<'tcx>>> {
let coroutine_layout = self.mir_coroutine_witnesses(def_id); let coroutine_layout = self.mir_coroutine_witnesses(def_id);
coroutine_layout coroutine_layout
.as_ref() .as_ref()
@ -709,7 +709,7 @@ impl<'tcx> TyCtxt<'tcx> {
pub fn bound_coroutine_hidden_types( pub fn bound_coroutine_hidden_types(
self, self,
def_id: DefId, def_id: DefId,
) -> impl Iterator<Item = ty::EarlyBinder<ty::Binder<'tcx, Ty<'tcx>>>> { ) -> impl Iterator<Item = ty::EarlyBinder<'tcx, ty::Binder<'tcx, Ty<'tcx>>>> {
let coroutine_layout = self.mir_coroutine_witnesses(def_id); let coroutine_layout = self.mir_coroutine_witnesses(def_id);
coroutine_layout coroutine_layout
.as_ref() .as_ref()

6
compiler/rustc_middle/src/values.rs
View File

@ -23,7 +23,7 @@ impl<'tcx> Value<TyCtxt<'tcx>> for Ty<'_> {
} }
} }
impl<'tcx> Value<TyCtxt<'tcx>> for Result<ty::EarlyBinder<Ty<'_>>, CyclePlaceholder> { impl<'tcx> Value<TyCtxt<'tcx>> for Result<ty::EarlyBinder<'_, Ty<'_>>, CyclePlaceholder> {
fn from_cycle_error(_tcx: TyCtxt<'tcx>, _: &CycleError, guar: ErrorGuaranteed) -> Self { fn from_cycle_error(_tcx: TyCtxt<'tcx>, _: &CycleError, guar: ErrorGuaranteed) -> Self {
Err(CyclePlaceholder(guar)) Err(CyclePlaceholder(guar))
} }
@ -111,7 +111,7 @@ impl<'tcx> Value<TyCtxt<'tcx>> for Representability {
} }
} }
impl<'tcx> Value<TyCtxt<'tcx>> for ty::EarlyBinder<Ty<'_>> { impl<'tcx> Value<TyCtxt<'tcx>> for ty::EarlyBinder<'_, Ty<'_>> {
fn from_cycle_error( fn from_cycle_error(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
cycle_error: &CycleError, cycle_error: &CycleError,
@ -121,7 +121,7 @@ impl<'tcx> Value<TyCtxt<'tcx>> for ty::EarlyBinder<Ty<'_>> {
} }
} }
impl<'tcx> Value<TyCtxt<'tcx>> for ty::EarlyBinder<ty::Binder<'_, ty::FnSig<'_>>> { impl<'tcx> Value<TyCtxt<'tcx>> for ty::EarlyBinder<'_, ty::Binder<'_, ty::FnSig<'_>>> {
fn from_cycle_error( fn from_cycle_error(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
cycle_error: &CycleError, cycle_error: &CycleError,

2
compiler/rustc_smir/src/rustc_smir/convert/ty.rs
View File

@ -194,7 +194,7 @@ where
} }
} }
impl<'tcx, S, V> Stable<'tcx> for ty::EarlyBinder<S> impl<'tcx, S, V> Stable<'tcx> for ty::EarlyBinder<'tcx, S>
where where
S: Stable<'tcx, T = V>, S: Stable<'tcx, T = V>,
{ {

2
compiler/rustc_trait_selection/src/traits/project.rs
View File

@ -2097,7 +2097,7 @@ fn confirm_impl_candidate<'cx, 'tcx>(
let args = translate_args(selcx.infcx, param_env, impl_def_id, args, assoc_ty.defining_node); let args = translate_args(selcx.infcx, param_env, impl_def_id, args, assoc_ty.defining_node);
let ty = tcx.type_of(assoc_ty.item.def_id); let ty = tcx.type_of(assoc_ty.item.def_id);
let is_const = matches!(tcx.def_kind(assoc_ty.item.def_id), DefKind::AssocConst); let is_const = matches!(tcx.def_kind(assoc_ty.item.def_id), DefKind::AssocConst);
let term: ty::EarlyBinder<ty::Term<'tcx>> = if is_const { let term: ty::EarlyBinder<'tcx, ty::Term<'tcx>> = if is_const {
let did = assoc_ty.item.def_id; let did = assoc_ty.item.def_id;
let identity_args = crate::traits::GenericArgs::identity_for_item(tcx, did); let identity_args = crate::traits::GenericArgs::identity_for_item(tcx, did);
let uv = ty::UnevaluatedConst::new(did, identity_args); let uv = ty::UnevaluatedConst::new(did, identity_args);

6
compiler/rustc_ty_utils/src/consts.rs
View File

@ -398,10 +398,10 @@ impl<'a, 'tcx> visit::Visitor<'a, 'tcx> for IsThirPolymorphic<'a, 'tcx> {
} }
/// Builds an abstract const, do not use this directly, but use `AbstractConst::new` instead. /// Builds an abstract const, do not use this directly, but use `AbstractConst::new` instead.
fn thir_abstract_const( fn thir_abstract_const<'tcx>(
tcx: TyCtxt<'_>, tcx: TyCtxt<'tcx>,
def: LocalDefId, def: LocalDefId,
) -> Result<Option<ty::EarlyBinder<ty::Const<'_>>>, ErrorGuaranteed> { ) -> Result<Option<ty::EarlyBinder<'tcx, ty::Const<'tcx>>>, ErrorGuaranteed> {
if !tcx.features().generic_const_exprs { if !tcx.features().generic_const_exprs {
return Ok(None); return Ok(None);
} }

4
compiler/rustc_ty_utils/src/ty.rs
View File

@ -77,7 +77,7 @@ fn defaultness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Defaultness {
fn adt_sized_constraint<'tcx>( fn adt_sized_constraint<'tcx>(
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
def_id: DefId, def_id: DefId,
) -> Option<ty::EarlyBinder<Ty<'tcx>>> { ) -> Option<ty::EarlyBinder<'tcx, Ty<'tcx>>> {
if let Some(def_id) = def_id.as_local() { if let Some(def_id) = def_id.as_local() {
if let ty::Representability::Infinite(_) = tcx.representability(def_id) { if let ty::Representability::Infinite(_) = tcx.representability(def_id) {
return None; return None;
@ -253,7 +253,7 @@ fn param_env_reveal_all_normalized(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamE
fn self_ty_of_trait_impl_enabling_order_dep_trait_object_hack( fn self_ty_of_trait_impl_enabling_order_dep_trait_object_hack(
tcx: TyCtxt<'_>, tcx: TyCtxt<'_>,
def_id: DefId, def_id: DefId,
) -> Option<EarlyBinder<Ty<'_>>> { ) -> Option<EarlyBinder<'_, Ty<'_>>> {
let impl_ = let impl_ =
tcx.impl_trait_header(def_id).unwrap_or_else(|| bug!("called on inherent impl {def_id:?}")); tcx.impl_trait_header(def_id).unwrap_or_else(|| bug!("called on inherent impl {def_id:?}"));

1
compiler/rustc_type_ir/Cargo.toml
View File

@ -15,6 +15,7 @@ rustc_serialize = { path = "../rustc_serialize", optional = true }
rustc_span = { path = "../rustc_span", optional = true } rustc_span = { path = "../rustc_span", optional = true }
rustc_type_ir_macros = { path = "../rustc_type_ir_macros" } rustc_type_ir_macros = { path = "../rustc_type_ir_macros" }
smallvec = { version = "1.8.1", default-features = false } smallvec = { version = "1.8.1", default-features = false }
tracing = "0.1"
# tidy-alphabetical-end # tidy-alphabetical-end
[features] [features]

519
compiler/rustc_type_ir/src/binder.rs
View File

@ -1,12 +1,14 @@
use std::fmt::Debug; use std::fmt::Debug;
use std::hash::Hash; use std::hash::Hash;
use std::marker::PhantomData;
use std::ops::{ControlFlow, Deref}; use std::ops::{ControlFlow, Deref};
#[cfg(feature = "nightly")] #[cfg(feature = "nightly")]
use rustc_macros::HashStable_NoContext; use rustc_macros::{HashStable_NoContext, TyDecodable, TyEncodable};
use rustc_serialize::Decodable; use rustc_serialize::Decodable;
use tracing::debug;
use crate::fold::{FallibleTypeFolder, TypeFoldable, TypeSuperFoldable}; use crate::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder, TypeSuperFoldable};
use crate::inherent::*; use crate::inherent::*;
use crate::lift::Lift; use crate::lift::Lift;
use crate::visit::{Flags, TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor}; use crate::visit::{Flags, TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor};
@ -338,3 +340,516 @@ impl<I: Interner> TypeVisitor<I> for ValidateBoundVars<I> {
ControlFlow::Continue(()) ControlFlow::Continue(())
} }
} }
/// Similar to [`super::Binder`] except that it tracks early bound generics, i.e. `struct Foo<T>(T)`
/// needs `T` instantiated immediately. This type primarily exists to avoid forgetting to call
/// `instantiate`.
///
/// If you don't have anything to `instantiate`, you may be looking for
/// [`instantiate_identity`](EarlyBinder::instantiate_identity) or [`skip_binder`](EarlyBinder::skip_binder).
#[derive(derivative::Derivative)]
#[derivative(
Clone(bound = "T: Clone"),
Copy(bound = "T: Copy"),
PartialEq(bound = "T: PartialEq"),
Eq(bound = "T: Eq"),
Ord(bound = "T: Ord"),
PartialOrd(bound = "T: Ord"),
Hash(bound = "T: Hash"),
Debug(bound = "T: Debug")
)]
#[cfg_attr(feature = "nightly", derive(TyEncodable, TyDecodable, HashStable_NoContext))]
pub struct EarlyBinder<I: Interner, T> {
value: T,
_tcx: PhantomData<I>,
}
/// For early binders, you should first call `instantiate` before using any visitors.
#[cfg(feature = "nightly")]
impl<I: Interner, T> !TypeFoldable<I> for ty::EarlyBinder<I, T> {}
/// For early binders, you should first call `instantiate` before using any visitors.
#[cfg(feature = "nightly")]
impl<I: Interner, T> !TypeVisitable<I> for ty::EarlyBinder<I, T> {}
impl<I: Interner, T> EarlyBinder<I, T> {
pub fn bind(value: T) -> EarlyBinder<I, T> {
EarlyBinder { value, _tcx: PhantomData }
}
pub fn as_ref(&self) -> EarlyBinder<I, &T> {
EarlyBinder { value: &self.value, _tcx: PhantomData }
}
pub fn map_bound_ref<F, U>(&self, f: F) -> EarlyBinder<I, U>
where
F: FnOnce(&T) -> U,
{
self.as_ref().map_bound(f)
}
pub fn map_bound<F, U>(self, f: F) -> EarlyBinder<I, U>
where
F: FnOnce(T) -> U,
{
let value = f(self.value);
EarlyBinder { value, _tcx: PhantomData }
}
pub fn try_map_bound<F, U, E>(self, f: F) -> Result<EarlyBinder<I, U>, E>
where
F: FnOnce(T) -> Result<U, E>,
{
let value = f(self.value)?;
Ok(EarlyBinder { value, _tcx: PhantomData })
}
pub fn rebind<U>(&self, value: U) -> EarlyBinder<I, U> {
EarlyBinder { value, _tcx: PhantomData }
}
/// Skips the binder and returns the "bound" value.
/// This can be used to extract data that does not depend on generic parameters
/// (e.g., getting the `DefId` of the inner value or getting the number of
/// arguments of an `FnSig`). Otherwise, consider using
/// [`instantiate_identity`](EarlyBinder::instantiate_identity).
///
/// To skip the binder on `x: &EarlyBinder<I, T>` to obtain `&T`, leverage
/// [`EarlyBinder::as_ref`](EarlyBinder::as_ref): `x.as_ref().skip_binder()`.
///
/// See also [`Binder::skip_binder`](super::Binder::skip_binder), which is
/// the analogous operation on [`super::Binder`].
pub fn skip_binder(self) -> T {
self.value
}
}
impl<I: Interner, T> EarlyBinder<I, Option<T>> {
pub fn transpose(self) -> Option<EarlyBinder<I, T>> {
self.value.map(|value| EarlyBinder { value, _tcx: PhantomData })
}
}
impl<'s, I: Interner, Iter: IntoIterator> EarlyBinder<I, Iter>
where
Iter::Item: TypeFoldable<I>,
{
pub fn iter_instantiated(
self,
tcx: I,
args: &'s [I::GenericArg],
) -> IterInstantiated<'s, I, Iter> {
IterInstantiated { it: self.value.into_iter(), tcx, args }
}
/// Similar to [`instantiate_identity`](EarlyBinder::instantiate_identity),
/// but on an iterator of `TypeFoldable` values.
pub fn instantiate_identity_iter(self) -> Iter::IntoIter {
self.value.into_iter()
}
}
pub struct IterInstantiated<'s, I: Interner, Iter: IntoIterator> {
it: Iter::IntoIter,
tcx: I,
args: &'s [I::GenericArg],
}
impl<I: Interner, Iter: IntoIterator> Iterator for IterInstantiated<'_, I, Iter>
where
Iter::Item: TypeFoldable<I>,
{
type Item = Iter::Item;
fn next(&mut self) -> Option<Self::Item> {
Some(
EarlyBinder { value: self.it.next()?, _tcx: PhantomData }
.instantiate(self.tcx, self.args),
)
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}
impl<I: Interner, Iter: IntoIterator> DoubleEndedIterator for IterInstantiated<'_, I, Iter>
where
Iter::IntoIter: DoubleEndedIterator,
Iter::Item: TypeFoldable<I>,
{
fn next_back(&mut self) -> Option<Self::Item> {
Some(
EarlyBinder { value: self.it.next_back()?, _tcx: PhantomData }
.instantiate(self.tcx, self.args),
)
}
}
impl<I: Interner, Iter: IntoIterator> ExactSizeIterator for IterInstantiated<'_, I, Iter>
where
Iter::IntoIter: ExactSizeIterator,
Iter::Item: TypeFoldable<I>,
{
}
impl<'s, I: Interner, Iter: IntoIterator> EarlyBinder<I, Iter>
where
Iter::Item: Deref,
<Iter::Item as Deref>::Target: Copy + TypeFoldable<I>,
{
pub fn iter_instantiated_copied(
self,
tcx: I,
args: &'s [I::GenericArg],
) -> IterInstantiatedCopied<'s, I, Iter> {
IterInstantiatedCopied { it: self.value.into_iter(), tcx, args }
}
/// Similar to [`instantiate_identity`](EarlyBinder::instantiate_identity),
/// but on an iterator of values that deref to a `TypeFoldable`.
pub fn instantiate_identity_iter_copied(
self,
) -> impl Iterator<Item = <Iter::Item as Deref>::Target> {
self.value.into_iter().map(|v| *v)
}
}
pub struct IterInstantiatedCopied<'a, I: Interner, Iter: IntoIterator> {
it: Iter::IntoIter,
tcx: I,
args: &'a [I::GenericArg],
}
impl<I: Interner, Iter: IntoIterator> Iterator for IterInstantiatedCopied<'_, I, Iter>
where
Iter::Item: Deref,
<Iter::Item as Deref>::Target: Copy + TypeFoldable<I>,
{
type Item = <Iter::Item as Deref>::Target;
fn next(&mut self) -> Option<Self::Item> {
self.it.next().map(|value| {
EarlyBinder { value: *value, _tcx: PhantomData }.instantiate(self.tcx, self.args)
})
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.it.size_hint()
}
}
impl<I: Interner, Iter: IntoIterator> DoubleEndedIterator for IterInstantiatedCopied<'_, I, Iter>
where
Iter::IntoIter: DoubleEndedIterator,
Iter::Item: Deref,
<Iter::Item as Deref>::Target: Copy + TypeFoldable<I>,
{
fn next_back(&mut self) -> Option<Self::Item> {
self.it.next_back().map(|value| {
EarlyBinder { value: *value, _tcx: PhantomData }.instantiate(self.tcx, self.args)
})
}
}
impl<I: Interner, Iter: IntoIterator> ExactSizeIterator for IterInstantiatedCopied<'_, I, Iter>
where
Iter::IntoIter: ExactSizeIterator,
Iter::Item: Deref,
<Iter::Item as Deref>::Target: Copy + TypeFoldable<I>,
{
}
pub struct EarlyBinderIter<I, T> {
t: T,
_tcx: PhantomData<I>,
}
impl<I: Interner, T: IntoIterator> EarlyBinder<I, T> {
pub fn transpose_iter(self) -> EarlyBinderIter<I, T::IntoIter> {
EarlyBinderIter { t: self.value.into_iter(), _tcx: PhantomData }
}
}
impl<I: Interner, T: Iterator> Iterator for EarlyBinderIter<I, T> {
type Item = EarlyBinder<I, T::Item>;
fn next(&mut self) -> Option<Self::Item> {
self.t.next().map(|value| EarlyBinder { value, _tcx: PhantomData })
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.t.size_hint()
}
}
impl<I: Interner, T: TypeFoldable<I>> ty::EarlyBinder<I, T> {
pub fn instantiate(self, tcx: I, args: &[I::GenericArg]) -> T {
let mut folder = ArgFolder { tcx, args, binders_passed: 0 };
self.value.fold_with(&mut folder)
}
/// Makes the identity replacement `T0 => T0, ..., TN => TN`.
/// Conceptually, this converts universally bound variables into placeholders
/// when inside of a given item.
///
/// For example, consider `for<T> fn foo<T>(){ .. }`:
/// - Outside of `foo`, `T` is bound (represented by the presence of `EarlyBinder`).
/// - Inside of the body of `foo`, we treat `T` as a placeholder by calling
/// `instantiate_identity` to discharge the `EarlyBinder`.
pub fn instantiate_identity(self) -> T {
self.value
}
/// Returns the inner value, but only if it contains no bound vars.
pub fn no_bound_vars(self) -> Option<T> {
if !self.value.has_param() { Some(self.value) } else { None }
}
}
///////////////////////////////////////////////////////////////////////////
// The actual instantiation engine itself is a type folder.
struct ArgFolder<'a, I: Interner> {
tcx: I,
args: &'a [I::GenericArg],
/// Number of region binders we have passed through while doing the instantiation
binders_passed: u32,
}
impl<'a, I: Interner> TypeFolder<I> for ArgFolder<'a, I> {
#[inline]
fn interner(&self) -> I {
self.tcx
}
fn fold_binder<T: TypeFoldable<I>>(&mut self, t: ty::Binder<I, T>) -> ty::Binder<I, T> {
self.binders_passed += 1;
let t = t.super_fold_with(self);
self.binders_passed -= 1;
t
}
fn fold_region(&mut self, r: I::Region) -> I::Region {
// Note: This routine only handles regions that are bound on
// type declarations and other outer declarations, not those
// bound in *fn types*. Region instantiation of the bound
// regions that appear in a function signature is done using
// the specialized routine `ty::replace_late_regions()`.
match r.kind() {
ty::ReEarlyParam(data) => {
let rk = self.args.get(data.index() as usize).map(|k| k.kind());
match rk {
Some(ty::GenericArgKind::Lifetime(lt)) => self.shift_region_through_binders(lt),
Some(other) => self.region_param_expected(data, r, other),
None => self.region_param_out_of_range(data, r),
}
}
ty::ReBound(..)
| ty::ReLateParam(_)
| ty::ReStatic
| ty::RePlaceholder(_)
| ty::ReErased
| ty::ReError(_) => r,
ty::ReVar(_) => panic!("unexpected region: {r:?}"),
}
}
fn fold_ty(&mut self, t: I::Ty) -> I::Ty {
if !t.has_param() {
return t;
}
match t.kind() {
ty::Param(p) => self.ty_for_param(p, t),
_ => t.super_fold_with(self),
}
}
fn fold_const(&mut self, c: I::Const) -> I::Const {
if let ty::ConstKind::Param(p) = c.kind() {
self.const_for_param(p, c)
} else {
c.super_fold_with(self)
}
}
}
impl<'a, I: Interner> ArgFolder<'a, I> {
fn ty_for_param(&self, p: I::ParamTy, source_ty: I::Ty) -> I::Ty {
// Look up the type in the args. It really should be in there.
let opt_ty = self.args.get(p.index() as usize).map(|k| k.kind());
let ty = match opt_ty {
Some(ty::GenericArgKind::Type(ty)) => ty,
Some(kind) => self.type_param_expected(p, source_ty, kind),
None => self.type_param_out_of_range(p, source_ty),
};
self.shift_vars_through_binders(ty)
}
#[cold]
#[inline(never)]
fn type_param_expected(&self, p: I::ParamTy, ty: I::Ty, kind: ty::GenericArgKind<I>) -> ! {
panic!(
"expected type for `{:?}` ({:?}/{}) but found {:?} when instantiating, args={:?}",
p,
ty,
p.index(),
kind,
self.args,
)
}
#[cold]
#[inline(never)]
fn type_param_out_of_range(&self, p: I::ParamTy, ty: I::Ty) -> ! {
panic!(
"type parameter `{:?}` ({:?}/{}) out of range when instantiating, args={:?}",
p,
ty,
p.index(),
self.args,
)
}
fn const_for_param(&self, p: I::ParamConst, source_ct: I::Const) -> I::Const {
// Look up the const in the args. It really should be in there.
let opt_ct = self.args.get(p.index() as usize).map(|k| k.kind());
let ct = match opt_ct {
Some(ty::GenericArgKind::Const(ct)) => ct,
Some(kind) => self.const_param_expected(p, source_ct, kind),
None => self.const_param_out_of_range(p, source_ct),
};
self.shift_vars_through_binders(ct)
}
#[cold]
#[inline(never)]
fn const_param_expected(
&self,
p: I::ParamConst,
ct: I::Const,
kind: ty::GenericArgKind<I>,
) -> ! {
panic!(
"expected const for `{:?}` ({:?}/{}) but found {:?} when instantiating args={:?}",
p,
ct,
p.index(),
kind,
self.args,
)
}
#[cold]
#[inline(never)]
fn const_param_out_of_range(&self, p: I::ParamConst, ct: I::Const) -> ! {
panic!(
"const parameter `{:?}` ({:?}/{}) out of range when instantiating args={:?}",
p,
ct,
p.index(),
self.args,
)
}
#[cold]
#[inline(never)]
fn region_param_expected(
&self,
ebr: I::EarlyParamRegion,
r: I::Region,
kind: ty::GenericArgKind<I>,
) -> ! {
panic!(
"expected region for `{:?}` ({:?}/{}) but found {:?} when instantiating args={:?}",
ebr,
r,
ebr.index(),
kind,
self.args,
)
}
#[cold]
#[inline(never)]
fn region_param_out_of_range(&self, ebr: I::EarlyParamRegion, r: I::Region) -> ! {
panic!(
"const parameter `{:?}` ({:?}/{}) out of range when instantiating args={:?}",
ebr,
r,
ebr.index(),
self.args,
)
}
/// It is sometimes necessary to adjust the De Bruijn indices during instantiation. This occurs
/// when we are instantating a type with escaping bound vars into a context where we have
/// passed through binders. That's quite a mouthful. Let's see an example:
///
/// ```
/// type Func<A> = fn(A);
/// type MetaFunc = for<'a> fn(Func<&'a i32>);
/// ```
///
/// The type `MetaFunc`, when fully expanded, will be
/// ```ignore (illustrative)
/// for<'a> fn(fn(&'a i32))
/// // ^~ ^~ ^~~
/// // | | |
/// // | | DebruijnIndex of 2
/// // Binders
/// ```
/// Here the `'a` lifetime is bound in the outer function, but appears as an argument of the
/// inner one. Therefore, that appearance will have a DebruijnIndex of 2, because we must skip
/// over the inner binder (remember that we count De Bruijn indices from 1). However, in the
/// definition of `MetaFunc`, the binder is not visible, so the type `&'a i32` will have a
/// De Bruijn index of 1. It's only during the instantiation that we can see we must increase the
/// depth by 1 to account for the binder that we passed through.
///
/// As a second example, consider this twist:
///
/// ```
/// type FuncTuple<A> = (A,fn(A));
/// type MetaFuncTuple = for<'a> fn(FuncTuple<&'a i32>);
/// ```
///
/// Here the final type will be:
/// ```ignore (illustrative)
/// for<'a> fn((&'a i32, fn(&'a i32)))
/// // ^~~ ^~~
/// // | |
/// // DebruijnIndex of 1 |
/// // DebruijnIndex of 2
/// ```
/// As indicated in the diagram, here the same type `&'a i32` is instantiated once, but in the
/// first case we do not increase the De Bruijn index and in the second case we do. The reason
/// is that only in the second case have we passed through a fn binder.
fn shift_vars_through_binders<T: TypeFoldable<I>>(&self, val: T) -> T {
debug!(
"shift_vars(val={:?}, binders_passed={:?}, has_escaping_bound_vars={:?})",
val,
self.binders_passed,
val.has_escaping_bound_vars()
);
if self.binders_passed == 0 || !val.has_escaping_bound_vars() {
return val;
}
let result = ty::fold::shift_vars(TypeFolder::interner(self), val, self.binders_passed);
debug!("shift_vars: shifted result = {:?}", result);
result
}
fn shift_region_through_binders(&self, region: I::Region) -> I::Region {
if self.binders_passed == 0 || !region.has_escaping_bound_vars() {
return region;
}
ty::fold::shift_region(self.tcx, region, self.binders_passed)
}
}

96
compiler/rustc_type_ir/src/fold.rs
View File

@ -47,8 +47,10 @@
use rustc_index::{Idx, IndexVec}; use rustc_index::{Idx, IndexVec};
use std::mem; use std::mem;
use tracing::debug;
use crate::visit::TypeVisitable; use crate::inherent::*;
use crate::visit::{TypeVisitable, TypeVisitableExt as _};
use crate::{self as ty, Interner, Lrc}; use crate::{self as ty, Interner, Lrc};
#[cfg(feature = "nightly")] #[cfg(feature = "nightly")]
@ -325,3 +327,95 @@ impl<I: Interner, T: TypeFoldable<I>, Ix: Idx> TypeFoldable<I> for IndexVec<Ix,
self.raw.try_fold_with(folder).map(IndexVec::from_raw) self.raw.try_fold_with(folder).map(IndexVec::from_raw)
} }
} }
///////////////////////////////////////////////////////////////////////////
// Shifter
//
// Shifts the De Bruijn indices on all escaping bound vars by a
// fixed amount. Useful in instantiation or when otherwise introducing
// a binding level that is not intended to capture the existing bound
// vars. See comment on `shift_vars_through_binders` method in
// `rustc_middle/src/ty/generic_args.rs` for more details.
struct Shifter<I: Interner> {
tcx: I,
current_index: ty::DebruijnIndex,
amount: u32,
}
impl<I: Interner> Shifter<I> {
pub fn new(tcx: I, amount: u32) -> Self {
Shifter { tcx, current_index: ty::INNERMOST, amount }
}
}
impl<I: Interner> TypeFolder<I> for Shifter<I> {
fn interner(&self) -> I {
self.tcx
}
fn fold_binder<T: TypeFoldable<I>>(&mut self, t: ty::Binder<I, T>) -> ty::Binder<I, T> {
self.current_index.shift_in(1);
let t = t.super_fold_with(self);
self.current_index.shift_out(1);
t
}
fn fold_region(&mut self, r: I::Region) -> I::Region {
match r.kind() {
ty::ReBound(debruijn, br) if debruijn >= self.current_index => {
let debruijn = debruijn.shifted_in(self.amount);
Region::new_bound(self.tcx, debruijn, br)
}
_ => r,
}
}
fn fold_ty(&mut self, ty: I::Ty) -> I::Ty {
match ty.kind() {
ty::Bound(debruijn, bound_ty) if debruijn >= self.current_index => {
let debruijn = debruijn.shifted_in(self.amount);
Ty::new_bound(self.tcx, debruijn, bound_ty)
}
_ if ty.has_vars_bound_at_or_above(self.current_index) => ty.super_fold_with(self),
_ => ty,
}
}
fn fold_const(&mut self, ct: I::Const) -> I::Const {
match ct.kind() {
ty::ConstKind::Bound(debruijn, bound_ct) if debruijn >= self.current_index => {
let debruijn = debruijn.shifted_in(self.amount);
Const::new_bound(self.tcx, debruijn, bound_ct, ct.ty())
}
_ => ct.super_fold_with(self),
}
}
fn fold_predicate(&mut self, p: I::Predicate) -> I::Predicate {
if p.has_vars_bound_at_or_above(self.current_index) { p.super_fold_with(self) } else { p }
}
}
pub fn shift_region<I: Interner>(tcx: I, region: I::Region, amount: u32) -> I::Region {
match region.kind() {
ty::ReBound(debruijn, br) if amount > 0 => {
Region::new_bound(tcx, debruijn.shifted_in(amount), br)
}
_ => region,
}
}
pub fn shift_vars<I: Interner, T>(tcx: I, value: T, amount: u32) -> T
where
T: TypeFoldable<I>,
{
debug!("shift_vars(value={:?}, amount={})", value, amount);
if amount == 0 || !value.has_escaping_bound_vars() {
return value;
}
value.fold_with(&mut Shifter::new(tcx, amount))
}

11
compiler/rustc_type_ir/src/inherent.rs
View File

@ -29,6 +29,8 @@ pub trait Ty<I: Interner<Ty = Self>>:
fn new_var(interner: I, var: ty::TyVid) -> Self; fn new_var(interner: I, var: ty::TyVid) -> Self;
fn new_bound(interner: I, debruijn: ty::DebruijnIndex, var: I::BoundTy) -> Self;
fn new_anon_bound(interner: I, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self; fn new_anon_bound(interner: I, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self;
fn new_alias(interner: I, kind: ty::AliasTyKind, alias_ty: ty::AliasTy<I>) -> Self; fn new_alias(interner: I, kind: ty::AliasTyKind, alias_ty: ty::AliasTy<I>) -> Self;
@ -65,7 +67,10 @@ pub trait Region<I: Interner<Region = Self>>:
+ Into<I::GenericArg> + Into<I::GenericArg>
+ IntoKind<Kind = ty::RegionKind<I>> + IntoKind<Kind = ty::RegionKind<I>>
+ Flags + Flags
+ TypeVisitable<I>
{ {
fn new_bound(interner: I, debruijn: ty::DebruijnIndex, var: I::BoundRegion) -> Self;
fn new_anon_bound(interner: I, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self; fn new_anon_bound(interner: I, debruijn: ty::DebruijnIndex, var: ty::BoundVar) -> Self;
fn new_static(interner: I) -> Self; fn new_static(interner: I) -> Self;
@ -87,6 +92,8 @@ pub trait Const<I: Interner<Const = Self>>:
fn new_var(interner: I, var: ty::ConstVid, ty: I::Ty) -> Self; fn new_var(interner: I, var: ty::ConstVid, ty: I::Ty) -> Self;
fn new_bound(interner: I, debruijn: ty::DebruijnIndex, var: I::BoundConst, ty: I::Ty) -> Self;
fn new_anon_bound( fn new_anon_bound(
interner: I, interner: I,
debruijn: ty::DebruijnIndex, debruijn: ty::DebruijnIndex,
@ -162,3 +169,7 @@ pub trait BoundVarLike<I: Interner> {
fn assert_eq(self, var: I::BoundVarKind); fn assert_eq(self, var: I::BoundVarKind);
} }
pub trait ParamLike {
fn index(self) -> u32;
}

50
compiler/rustc_type_ir/src/interner.rs
View File

@ -7,26 +7,22 @@ use crate::inherent::*;
use crate::ir_print::IrPrint; use crate::ir_print::IrPrint;
use crate::solve::inspect::CanonicalGoalEvaluationStep; use crate::solve::inspect::CanonicalGoalEvaluationStep;
use crate::visit::{Flags, TypeSuperVisitable, TypeVisitable}; use crate::visit::{Flags, TypeSuperVisitable, TypeVisitable};
use crate::{ use crate::{self as ty, DebugWithInfcx};
AliasTerm, AliasTermKind, AliasTy, AliasTyKind, CanonicalVarInfo, CoercePredicate,
DebugWithInfcx, ExistentialProjection, ExistentialTraitRef, FnSig, GenericArgKind,
NormalizesTo, ProjectionPredicate, SubtypePredicate, TermKind, TraitPredicate, TraitRef,
};
pub trait Interner: pub trait Interner:
Sized Sized
+ Copy + Copy
+ IrPrint<AliasTy<Self>> + IrPrint<ty::AliasTy<Self>>
+ IrPrint<AliasTerm<Self>> + IrPrint<ty::AliasTerm<Self>>
+ IrPrint<TraitRef<Self>> + IrPrint<ty::TraitRef<Self>>
+ IrPrint<TraitPredicate<Self>> + IrPrint<ty::TraitPredicate<Self>>
+ IrPrint<ExistentialTraitRef<Self>> + IrPrint<ty::ExistentialTraitRef<Self>>
+ IrPrint<ExistentialProjection<Self>> + IrPrint<ty::ExistentialProjection<Self>>
+ IrPrint<ProjectionPredicate<Self>> + IrPrint<ty::ProjectionPredicate<Self>>
+ IrPrint<NormalizesTo<Self>> + IrPrint<ty::NormalizesTo<Self>>
+ IrPrint<SubtypePredicate<Self>> + IrPrint<ty::SubtypePredicate<Self>>
+ IrPrint<CoercePredicate<Self>> + IrPrint<ty::CoercePredicate<Self>>
+ IrPrint<FnSig<Self>> + IrPrint<ty::FnSig<Self>>
{ {
type DefId: Copy + Debug + Hash + Eq + TypeVisitable<Self>; type DefId: Copy + Debug + Hash + Eq + TypeVisitable<Self>;
type AdtDef: Copy + Debug + Hash + Eq; type AdtDef: Copy + Debug + Hash + Eq;
@ -39,9 +35,9 @@ pub trait Interner:
+ DebugWithInfcx<Self> + DebugWithInfcx<Self>
+ Hash + Hash
+ Eq + Eq
+ IntoKind<Kind = GenericArgKind<Self>> + IntoKind<Kind = ty::GenericArgKind<Self>>
+ TypeVisitable<Self>; + TypeVisitable<Self>;
type Term: Copy + Debug + Hash + Eq + IntoKind<Kind = TermKind<Self>> + TypeVisitable<Self>; type Term: Copy + Debug + Hash + Eq + IntoKind<Kind = ty::TermKind<Self>> + TypeVisitable<Self>;
type BoundVarKinds: Copy type BoundVarKinds: Copy
+ Debug + Debug
@ -51,7 +47,7 @@ pub trait Interner:
+ Default; + Default;
type BoundVarKind: Copy + Debug + Hash + Eq; type BoundVarKind: Copy + Debug + Hash + Eq;
type CanonicalVars: Copy + Debug + Hash + Eq + IntoIterator<Item = CanonicalVarInfo<Self>>; type CanonicalVars: Copy + Debug + Hash + Eq + IntoIterator<Item = ty::CanonicalVarInfo<Self>>;
type PredefinedOpaques: Copy + Debug + Hash + Eq; type PredefinedOpaques: Copy + Debug + Hash + Eq;
type DefiningOpaqueTypes: Copy + Debug + Hash + Default + Eq + TypeVisitable<Self>; type DefiningOpaqueTypes: Copy + Debug + Hash + Default + Eq + TypeVisitable<Self>;
type ExternalConstraints: Copy + Debug + Hash + Eq; type ExternalConstraints: Copy + Debug + Hash + Eq;
@ -65,7 +61,7 @@ pub trait Interner:
type Ty: Ty<Self>; type Ty: Ty<Self>;
type Tys: Tys<Self>; type Tys: Tys<Self>;
type FnInputTys: Copy + Debug + Hash + Eq + Deref<Target = [Self::Ty]> + TypeVisitable<Self>; type FnInputTys: Copy + Debug + Hash + Eq + Deref<Target = [Self::Ty]> + TypeVisitable<Self>;
type ParamTy: Copy + Debug + Hash + Eq; type ParamTy: Copy + Debug + Hash + Eq + ParamLike;
type BoundTy: Copy + Debug + Hash + Eq + BoundVarLike<Self>; type BoundTy: Copy + Debug + Hash + Eq + BoundVarLike<Self>;
type PlaceholderTy: PlaceholderLike; type PlaceholderTy: PlaceholderLike;
@ -81,14 +77,14 @@ pub trait Interner:
// Kinds of consts // Kinds of consts
type Const: Const<Self>; type Const: Const<Self>;
type PlaceholderConst: PlaceholderLike; type PlaceholderConst: PlaceholderLike;
type ParamConst: Copy + Debug + Hash + Eq; type ParamConst: Copy + Debug + Hash + Eq + ParamLike;
type BoundConst: Copy + Debug + Hash + Eq + BoundVarLike<Self>; type BoundConst: Copy + Debug + Hash + Eq + BoundVarLike<Self>;
type ValueConst: Copy + Debug + Hash + Eq; type ValueConst: Copy + Debug + Hash + Eq;
type ExprConst: Copy + DebugWithInfcx<Self> + Hash + Eq; type ExprConst: Copy + DebugWithInfcx<Self> + Hash + Eq;
// Kinds of regions // Kinds of regions
type Region: Region<Self>; type Region: Region<Self>;
type EarlyParamRegion: Copy + Debug + Hash + Eq; type EarlyParamRegion: Copy + Debug + Hash + Eq + ParamLike;
type LateParamRegion: Copy + Debug + Hash + Eq; type LateParamRegion: Copy + Debug + Hash + Eq;
type BoundRegion: Copy + Debug + Hash + Eq + BoundVarLike<Self>; type BoundRegion: Copy + Debug + Hash + Eq + BoundVarLike<Self>;
type PlaceholderRegion: PlaceholderLike; type PlaceholderRegion: PlaceholderLike;
@ -99,23 +95,23 @@ pub trait Interner:
type Clause: Clause<Self>; type Clause: Clause<Self>;
type Clauses: Copy + Debug + Hash + Eq + TypeSuperVisitable<Self> + Flags; type Clauses: Copy + Debug + Hash + Eq + TypeSuperVisitable<Self> + Flags;
fn mk_canonical_var_infos(self, infos: &[CanonicalVarInfo<Self>]) -> Self::CanonicalVars; fn mk_canonical_var_infos(self, infos: &[ty::CanonicalVarInfo<Self>]) -> Self::CanonicalVars;
type GenericsOf: GenericsOf<Self>; type GenericsOf: GenericsOf<Self>;
fn generics_of(self, def_id: Self::DefId) -> Self::GenericsOf; fn generics_of(self, def_id: Self::DefId) -> Self::GenericsOf;
// FIXME: Remove after uplifting `EarlyBinder` // FIXME: Remove after uplifting `EarlyBinder`
fn type_of_instantiated(self, def_id: Self::DefId, args: Self::GenericArgs) -> Self::Ty; fn type_of(self, def_id: Self::DefId) -> ty::EarlyBinder<Self, Self::Ty>;
fn alias_ty_kind(self, alias: AliasTy<Self>) -> AliasTyKind; fn alias_ty_kind(self, alias: ty::AliasTy<Self>) -> ty::AliasTyKind;
fn alias_term_kind(self, alias: AliasTerm<Self>) -> AliasTermKind; fn alias_term_kind(self, alias: ty::AliasTerm<Self>) -> ty::AliasTermKind;
fn trait_ref_and_own_args_for_alias( fn trait_ref_and_own_args_for_alias(
self, self,
def_id: Self::DefId, def_id: Self::DefId,
args: Self::GenericArgs, args: Self::GenericArgs,
) -> (TraitRef<Self>, Self::OwnItemArgs); ) -> (ty::TraitRef<Self>, Self::OwnItemArgs);
fn mk_args(self, args: &[Self::GenericArg]) -> Self::GenericArgs; fn mk_args(self, args: &[Self::GenericArg]) -> Self::GenericArgs;

2
compiler/rustc_type_ir/src/lib.rs
View File

@ -1,6 +1,6 @@
#![cfg_attr( #![cfg_attr(
feature = "nightly", feature = "nightly",
feature(associated_type_defaults, min_specialization, never_type, rustc_attrs) feature(associated_type_defaults, min_specialization, never_type, rustc_attrs, negative_impls)
)] )]
#![allow(rustc::usage_of_ty_tykind)] #![allow(rustc::usage_of_ty_tykind)]
#![cfg_attr(feature = "nightly", allow(internal_features))] #![cfg_attr(feature = "nightly", allow(internal_features))]

2
compiler/rustc_type_ir/src/predicate.rs
View File

@ -567,7 +567,7 @@ impl<I: Interner> AliasTerm<I> {
I::Const::new_unevaluated( I::Const::new_unevaluated(
interner, interner,
ty::UnevaluatedConst::new(self.def_id, self.args), ty::UnevaluatedConst::new(self.def_id, self.args),
interner.type_of_instantiated(self.def_id, self.args), interner.type_of(self.def_id).instantiate(interner, &self.args),
) )
.into() .into()
} }