1 //! Type context book-keeping.
3 use crate::arena::Arena;
4 use crate::dep_graph::{DepGraph, DepKind, DepKindStruct};
5 use crate::hir::place::Place as HirPlace;
6 use crate::infer::canonical::{Canonical, CanonicalVarInfo, CanonicalVarInfos};
7 use crate::lint::{struct_lint_level, LintDiagnosticBuilder, LintLevelSource};
8 use crate::middle::resolve_lifetime::{self, LifetimeScopeForPath};
9 use crate::middle::stability;
10 use crate::mir::interpret::{self, Allocation, ConstAllocation, ConstValue, Scalar};
12 Body, BorrowCheckResult, Field, Local, Place, PlaceElem, ProjectionKind, Promoted,
14 use crate::thir::Thir;
16 use crate::ty::query::{self, TyCtxtAt};
17 use crate::ty::subst::{GenericArg, GenericArgKind, InternalSubsts, Subst, SubstsRef, UserSubsts};
18 use crate::ty::TyKind::*;
20 self, AdtDef, AdtDefData, AdtKind, Binder, BindingMode, BoundVar, CanonicalPolyFnSig,
21 ClosureSizeProfileData, Const, ConstS, ConstVid, DefIdTree, ExistentialPredicate, FloatTy,
22 FloatVar, FloatVid, GenericParamDefKind, InferConst, InferTy, IntTy, IntVar, IntVid, List,
23 ParamConst, ParamTy, PolyFnSig, Predicate, PredicateKind, PredicateS, ProjectionTy, Region,
24 RegionKind, ReprOptions, TraitObjectVisitor, Ty, TyKind, TyS, TyVar, TyVid, TypeAndMut, UintTy,
27 use rustc_data_structures::fingerprint::Fingerprint;
28 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
29 use rustc_data_structures::intern::Interned;
30 use rustc_data_structures::memmap::Mmap;
31 use rustc_data_structures::profiling::SelfProfilerRef;
32 use rustc_data_structures::sharded::{IntoPointer, ShardedHashMap};
33 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
34 use rustc_data_structures::steal::Steal;
35 use rustc_data_structures::sync::{self, Lock, Lrc, WorkerLocal};
36 use rustc_errors::ErrorGuaranteed;
38 use rustc_hir::def::{DefKind, Res};
39 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LOCAL_CRATE};
40 use rustc_hir::intravisit::Visitor;
41 use rustc_hir::lang_items::LangItem;
43 Constness, ExprKind, HirId, ImplItemKind, ItemKind, ItemLocalId, ItemLocalMap, ItemLocalSet,
44 Node, TraitCandidate, TraitItemKind,
46 use rustc_index::vec::{Idx, IndexVec};
47 use rustc_macros::HashStable;
48 use rustc_middle::mir::FakeReadCause;
49 use rustc_query_system::ich::{NodeIdHashingMode, StableHashingContext};
50 use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
51 use rustc_session::config::{BorrowckMode, CrateType, OutputFilenames};
52 use rustc_session::lint::{Level, Lint};
53 use rustc_session::Limit;
54 use rustc_session::Session;
55 use rustc_span::def_id::{DefPathHash, StableCrateId};
56 use rustc_span::source_map::{MultiSpan, SourceMap};
57 use rustc_span::symbol::{kw, sym, Ident, Symbol};
58 use rustc_span::{Span, DUMMY_SP};
59 use rustc_target::abi::{Layout, LayoutS, TargetDataLayout, VariantIdx};
60 use rustc_target::spec::abi;
62 use rustc_type_ir::TypeFlags;
63 use smallvec::SmallVec;
65 use std::borrow::Borrow;
66 use std::cmp::Ordering;
67 use std::collections::hash_map::{self, Entry};
69 use std::hash::{Hash, Hasher};
72 use std::ops::{Bound, Deref};
75 pub trait OnDiskCache<'tcx>: rustc_data_structures::sync::Sync {
76 /// Creates a new `OnDiskCache` instance from the serialized data in `data`.
77 fn new(sess: &'tcx Session, data: Mmap, start_pos: usize) -> Self
81 fn new_empty(source_map: &'tcx SourceMap) -> Self
85 fn drop_serialized_data(&self, tcx: TyCtxt<'tcx>);
87 fn serialize(&self, tcx: TyCtxt<'tcx>, encoder: &mut FileEncoder) -> FileEncodeResult;
90 /// A type that is not publicly constructable. This prevents people from making [`TyKind::Error`]s
91 /// except through the error-reporting functions on a [`tcx`][TyCtxt].
92 #[derive(Copy, Clone, Debug, Eq, Hash, PartialEq, PartialOrd, Ord)]
93 #[derive(TyEncodable, TyDecodable, HashStable)]
94 pub struct DelaySpanBugEmitted {
95 pub reported: ErrorGuaranteed,
99 type InternedSet<'tcx, T> = ShardedHashMap<InternedInSet<'tcx, T>, ()>;
101 pub struct CtxtInterners<'tcx> {
102 /// The arena that types, regions, etc. are allocated from.
103 arena: &'tcx WorkerLocal<Arena<'tcx>>,
105 // Specifically use a speedy hash algorithm for these hash sets, since
106 // they're accessed quite often.
107 type_: InternedSet<'tcx, TyS<'tcx>>,
108 substs: InternedSet<'tcx, InternalSubsts<'tcx>>,
109 canonical_var_infos: InternedSet<'tcx, List<CanonicalVarInfo<'tcx>>>,
110 region: InternedSet<'tcx, RegionKind>,
111 poly_existential_predicates:
112 InternedSet<'tcx, List<ty::Binder<'tcx, ExistentialPredicate<'tcx>>>>,
113 predicate: InternedSet<'tcx, PredicateS<'tcx>>,
114 predicates: InternedSet<'tcx, List<Predicate<'tcx>>>,
115 projs: InternedSet<'tcx, List<ProjectionKind>>,
116 place_elems: InternedSet<'tcx, List<PlaceElem<'tcx>>>,
117 const_: InternedSet<'tcx, ConstS<'tcx>>,
118 const_allocation: InternedSet<'tcx, Allocation>,
119 bound_variable_kinds: InternedSet<'tcx, List<ty::BoundVariableKind>>,
120 layout: InternedSet<'tcx, LayoutS<'tcx>>,
121 adt_def: InternedSet<'tcx, AdtDefData>,
124 impl<'tcx> CtxtInterners<'tcx> {
125 fn new(arena: &'tcx WorkerLocal<Arena<'tcx>>) -> CtxtInterners<'tcx> {
128 type_: Default::default(),
129 substs: Default::default(),
130 region: Default::default(),
131 poly_existential_predicates: Default::default(),
132 canonical_var_infos: Default::default(),
133 predicate: Default::default(),
134 predicates: Default::default(),
135 projs: Default::default(),
136 place_elems: Default::default(),
137 const_: Default::default(),
138 const_allocation: Default::default(),
139 bound_variable_kinds: Default::default(),
140 layout: Default::default(),
141 adt_def: Default::default(),
146 #[allow(rustc::usage_of_ty_tykind)]
152 resolutions: &ty::ResolverOutputs,
154 Ty(Interned::new_unchecked(
156 .intern(kind, |kind| {
157 let flags = super::flags::FlagComputation::for_kind(&kind);
159 // It's impossible to hash inference regions (and will ICE), so we don't need to try to cache them.
160 // Without incremental, we rarely stable-hash types, so let's not do it proactively.
161 let stable_hash = if flags.flags.intersects(TypeFlags::HAS_RE_INFER)
162 || sess.opts.incremental.is_none()
166 let mut hasher = StableHasher::new();
167 let mut hcx = StableHashingContext::ignore_spans(
169 &resolutions.definitions,
170 &*resolutions.cstore,
172 kind.hash_stable(&mut hcx, &mut hasher);
176 let ty_struct = TyS {
179 outer_exclusive_binder: flags.outer_exclusive_binder,
183 InternedInSet(self.arena.alloc(ty_struct))
190 fn intern_predicate(&self, kind: Binder<'tcx, PredicateKind<'tcx>>) -> Predicate<'tcx> {
191 Predicate(Interned::new_unchecked(
193 .intern(kind, |kind| {
194 let flags = super::flags::FlagComputation::for_predicate(kind);
196 let predicate_struct = PredicateS {
199 outer_exclusive_binder: flags.outer_exclusive_binder,
202 InternedInSet(self.arena.alloc(predicate_struct))
209 pub struct CommonTypes<'tcx> {
229 pub self_param: Ty<'tcx>,
231 /// Dummy type used for the `Self` of a `TraitRef` created for converting
232 /// a trait object, and which gets removed in `ExistentialTraitRef`.
233 /// This type must not appear anywhere in other converted types.
234 pub trait_object_dummy_self: Ty<'tcx>,
237 pub struct CommonLifetimes<'tcx> {
238 /// `ReEmpty` in the root universe.
239 pub re_root_empty: Region<'tcx>,
242 pub re_static: Region<'tcx>,
244 /// Erased region, used outside of type inference.
245 pub re_erased: Region<'tcx>,
248 pub struct CommonConsts<'tcx> {
249 pub unit: Const<'tcx>,
252 pub struct LocalTableInContext<'a, V> {
253 hir_owner: LocalDefId,
254 data: &'a ItemLocalMap<V>,
257 /// Validate that the given HirId (respectively its `local_id` part) can be
258 /// safely used as a key in the maps of a TypeckResults. For that to be
259 /// the case, the HirId must have the same `owner` as all the other IDs in
260 /// this table (signified by `hir_owner`). Otherwise the HirId
261 /// would be in a different frame of reference and using its `local_id`
262 /// would result in lookup errors, or worse, in silently wrong data being
265 fn validate_hir_id_for_typeck_results(hir_owner: LocalDefId, hir_id: hir::HirId) {
266 if hir_id.owner != hir_owner {
267 invalid_hir_id_for_typeck_results(hir_owner, hir_id);
273 fn invalid_hir_id_for_typeck_results(hir_owner: LocalDefId, hir_id: hir::HirId) {
274 ty::tls::with(|tcx| {
276 "node {} with HirId::owner {:?} cannot be placed in TypeckResults with hir_owner {:?}",
277 tcx.hir().node_to_string(hir_id),
284 impl<'a, V> LocalTableInContext<'a, V> {
285 pub fn contains_key(&self, id: hir::HirId) -> bool {
286 validate_hir_id_for_typeck_results(self.hir_owner, id);
287 self.data.contains_key(&id.local_id)
290 pub fn get(&self, id: hir::HirId) -> Option<&V> {
291 validate_hir_id_for_typeck_results(self.hir_owner, id);
292 self.data.get(&id.local_id)
295 pub fn iter(&self) -> hash_map::Iter<'_, hir::ItemLocalId, V> {
300 impl<'a, V> ::std::ops::Index<hir::HirId> for LocalTableInContext<'a, V> {
303 fn index(&self, key: hir::HirId) -> &V {
304 self.get(key).expect("LocalTableInContext: key not found")
308 pub struct LocalTableInContextMut<'a, V> {
309 hir_owner: LocalDefId,
310 data: &'a mut ItemLocalMap<V>,
313 impl<'a, V> LocalTableInContextMut<'a, V> {
314 pub fn get_mut(&mut self, id: hir::HirId) -> Option<&mut V> {
315 validate_hir_id_for_typeck_results(self.hir_owner, id);
316 self.data.get_mut(&id.local_id)
319 pub fn entry(&mut self, id: hir::HirId) -> Entry<'_, hir::ItemLocalId, V> {
320 validate_hir_id_for_typeck_results(self.hir_owner, id);
321 self.data.entry(id.local_id)
324 pub fn insert(&mut self, id: hir::HirId, val: V) -> Option<V> {
325 validate_hir_id_for_typeck_results(self.hir_owner, id);
326 self.data.insert(id.local_id, val)
329 pub fn remove(&mut self, id: hir::HirId) -> Option<V> {
330 validate_hir_id_for_typeck_results(self.hir_owner, id);
331 self.data.remove(&id.local_id)
335 /// Whenever a value may be live across a generator yield, the type of that value winds up in the
336 /// `GeneratorInteriorTypeCause` struct. This struct adds additional information about such
337 /// captured types that can be useful for diagnostics. In particular, it stores the span that
338 /// caused a given type to be recorded, along with the scope that enclosed the value (which can
339 /// be used to find the await that the value is live across).
343 /// ```ignore (pseudo-Rust)
351 /// Here, we would store the type `T`, the span of the value `x`, the "scope-span" for
352 /// the scope that contains `x`, the expr `T` evaluated from, and the span of `foo.await`.
353 #[derive(TyEncodable, TyDecodable, Clone, Debug, Eq, Hash, PartialEq, HashStable)]
354 #[derive(TypeFoldable)]
355 pub struct GeneratorInteriorTypeCause<'tcx> {
356 /// Type of the captured binding.
358 /// Span of the binding that was captured.
360 /// Span of the scope of the captured binding.
361 pub scope_span: Option<Span>,
362 /// Span of `.await` or `yield` expression.
363 pub yield_span: Span,
364 /// Expr which the type evaluated from.
365 pub expr: Option<hir::HirId>,
368 #[derive(TyEncodable, TyDecodable, Debug)]
369 pub struct TypeckResults<'tcx> {
370 /// The `HirId::owner` all `ItemLocalId`s in this table are relative to.
371 pub hir_owner: LocalDefId,
373 /// Resolved definitions for `<T>::X` associated paths and
374 /// method calls, including those of overloaded operators.
375 type_dependent_defs: ItemLocalMap<Result<(DefKind, DefId), ErrorGuaranteed>>,
377 /// Resolved field indices for field accesses in expressions (`S { field }`, `obj.field`)
378 /// or patterns (`S { field }`). The index is often useful by itself, but to learn more
379 /// about the field you also need definition of the variant to which the field
380 /// belongs, but it may not exist if it's a tuple field (`tuple.0`).
381 field_indices: ItemLocalMap<usize>,
383 /// Stores the types for various nodes in the AST. Note that this table
384 /// is not guaranteed to be populated outside inference. See
385 /// typeck::check::fn_ctxt for details.
386 node_types: ItemLocalMap<Ty<'tcx>>,
388 /// Stores the type parameters which were substituted to obtain the type
389 /// of this node. This only applies to nodes that refer to entities
390 /// parameterized by type parameters, such as generic fns, types, or
392 node_substs: ItemLocalMap<SubstsRef<'tcx>>,
394 /// This will either store the canonicalized types provided by the user
395 /// or the substitutions that the user explicitly gave (if any) attached
396 /// to `id`. These will not include any inferred values. The canonical form
397 /// is used to capture things like `_` or other unspecified values.
399 /// For example, if the user wrote `foo.collect::<Vec<_>>()`, then the
400 /// canonical substitutions would include only `for<X> { Vec<X> }`.
402 /// See also `AscribeUserType` statement in MIR.
403 user_provided_types: ItemLocalMap<CanonicalUserType<'tcx>>,
405 /// Stores the canonicalized types provided by the user. See also
406 /// `AscribeUserType` statement in MIR.
407 pub user_provided_sigs: DefIdMap<CanonicalPolyFnSig<'tcx>>,
409 adjustments: ItemLocalMap<Vec<ty::adjustment::Adjustment<'tcx>>>,
411 /// Stores the actual binding mode for all instances of hir::BindingAnnotation.
412 pat_binding_modes: ItemLocalMap<BindingMode>,
414 /// Stores the types which were implicitly dereferenced in pattern binding modes
415 /// for later usage in THIR lowering. For example,
418 /// match &&Some(5i32) {
423 /// leads to a `vec![&&Option<i32>, &Option<i32>]`. Empty vectors are not stored.
426 /// <https://github.com/rust-lang/rfcs/blob/master/text/2005-match-ergonomics.md#definitions>
427 pat_adjustments: ItemLocalMap<Vec<Ty<'tcx>>>,
429 /// Records the reasons that we picked the kind of each closure;
430 /// not all closures are present in the map.
431 closure_kind_origins: ItemLocalMap<(Span, HirPlace<'tcx>)>,
433 /// For each fn, records the "liberated" types of its arguments
434 /// and return type. Liberated means that all bound regions
435 /// (including late-bound regions) are replaced with free
436 /// equivalents. This table is not used in codegen (since regions
437 /// are erased there) and hence is not serialized to metadata.
439 /// This table also contains the "revealed" values for any `impl Trait`
440 /// that appear in the signature and whose values are being inferred
441 /// by this function.
446 /// fn foo(x: &u32) -> impl Debug { *x }
449 /// The function signature here would be:
452 /// for<'a> fn(&'a u32) -> Foo
455 /// where `Foo` is an opaque type created for this function.
458 /// The *liberated* form of this would be
461 /// fn(&'a u32) -> u32
464 /// Note that `'a` is not bound (it would be an `ReFree`) and
465 /// that the `Foo` opaque type is replaced by its hidden type.
466 liberated_fn_sigs: ItemLocalMap<ty::FnSig<'tcx>>,
468 /// For each FRU expression, record the normalized types of the fields
469 /// of the struct - this is needed because it is non-trivial to
470 /// normalize while preserving regions. This table is used only in
471 /// MIR construction and hence is not serialized to metadata.
472 fru_field_types: ItemLocalMap<Vec<Ty<'tcx>>>,
474 /// For every coercion cast we add the HIR node ID of the cast
475 /// expression to this set.
476 coercion_casts: ItemLocalSet,
478 /// Set of trait imports actually used in the method resolution.
479 /// This is used for warning unused imports. During type
480 /// checking, this `Lrc` should not be cloned: it must have a ref-count
481 /// of 1 so that we can insert things into the set mutably.
482 pub used_trait_imports: Lrc<FxHashSet<LocalDefId>>,
484 /// If any errors occurred while type-checking this body,
485 /// this field will be set to `Some(ErrorGuaranteed)`.
486 pub tainted_by_errors: Option<ErrorGuaranteed>,
488 /// All the opaque types that are restricted to concrete types
489 /// by this function.
490 pub concrete_opaque_types: FxHashSet<DefId>,
492 /// Tracks the minimum captures required for a closure;
493 /// see `MinCaptureInformationMap` for more details.
494 pub closure_min_captures: ty::MinCaptureInformationMap<'tcx>,
496 /// Tracks the fake reads required for a closure and the reason for the fake read.
497 /// When performing pattern matching for closures, there are times we don't end up
498 /// reading places that are mentioned in a closure (because of _ patterns). However,
499 /// to ensure the places are initialized, we introduce fake reads.
500 /// Consider these two examples:
501 /// ``` (discriminant matching with only wildcard arm)
503 /// let c = || match x { _ => () };
505 /// In this example, we don't need to actually read/borrow `x` in `c`, and so we don't
506 /// want to capture it. However, we do still want an error here, because `x` should have
507 /// to be initialized at the point where c is created. Therefore, we add a "fake read"
509 /// ``` (destructured assignments)
511 /// let (t1, t2) = t;
514 /// In the second example, we capture the disjoint fields of `t` (`t.0` & `t.1`), but
515 /// we never capture `t`. This becomes an issue when we build MIR as we require
516 /// information on `t` in order to create place `t.0` and `t.1`. We can solve this
517 /// issue by fake reading `t`.
518 pub closure_fake_reads: FxHashMap<DefId, Vec<(HirPlace<'tcx>, FakeReadCause, hir::HirId)>>,
520 /// Stores the type, expression, span and optional scope span of all types
521 /// that are live across the yield of this generator (if a generator).
522 pub generator_interior_types: ty::Binder<'tcx, Vec<GeneratorInteriorTypeCause<'tcx>>>,
524 /// We sometimes treat byte string literals (which are of type `&[u8; N]`)
525 /// as `&[u8]`, depending on the pattern in which they are used.
526 /// This hashset records all instances where we behave
527 /// like this to allow `const_to_pat` to reliably handle this situation.
528 pub treat_byte_string_as_slice: ItemLocalSet,
530 /// Contains the data for evaluating the effect of feature `capture_disjoint_fields`
532 pub closure_size_eval: FxHashMap<DefId, ClosureSizeProfileData<'tcx>>,
535 impl<'tcx> TypeckResults<'tcx> {
536 pub fn new(hir_owner: LocalDefId) -> TypeckResults<'tcx> {
539 type_dependent_defs: Default::default(),
540 field_indices: Default::default(),
541 user_provided_types: Default::default(),
542 user_provided_sigs: Default::default(),
543 node_types: Default::default(),
544 node_substs: Default::default(),
545 adjustments: Default::default(),
546 pat_binding_modes: Default::default(),
547 pat_adjustments: Default::default(),
548 closure_kind_origins: Default::default(),
549 liberated_fn_sigs: Default::default(),
550 fru_field_types: Default::default(),
551 coercion_casts: Default::default(),
552 used_trait_imports: Lrc::new(Default::default()),
553 tainted_by_errors: None,
554 concrete_opaque_types: Default::default(),
555 closure_min_captures: Default::default(),
556 closure_fake_reads: Default::default(),
557 generator_interior_types: ty::Binder::dummy(Default::default()),
558 treat_byte_string_as_slice: Default::default(),
559 closure_size_eval: Default::default(),
563 /// Returns the final resolution of a `QPath` in an `Expr` or `Pat` node.
564 pub fn qpath_res(&self, qpath: &hir::QPath<'_>, id: hir::HirId) -> Res {
566 hir::QPath::Resolved(_, ref path) => path.res,
567 hir::QPath::TypeRelative(..) | hir::QPath::LangItem(..) => self
568 .type_dependent_def(id)
569 .map_or(Res::Err, |(kind, def_id)| Res::Def(kind, def_id)),
573 pub fn type_dependent_defs(
575 ) -> LocalTableInContext<'_, Result<(DefKind, DefId), ErrorGuaranteed>> {
576 LocalTableInContext { hir_owner: self.hir_owner, data: &self.type_dependent_defs }
579 pub fn type_dependent_def(&self, id: HirId) -> Option<(DefKind, DefId)> {
580 validate_hir_id_for_typeck_results(self.hir_owner, id);
581 self.type_dependent_defs.get(&id.local_id).cloned().and_then(|r| r.ok())
584 pub fn type_dependent_def_id(&self, id: HirId) -> Option<DefId> {
585 self.type_dependent_def(id).map(|(_, def_id)| def_id)
588 pub fn type_dependent_defs_mut(
590 ) -> LocalTableInContextMut<'_, Result<(DefKind, DefId), ErrorGuaranteed>> {
591 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.type_dependent_defs }
594 pub fn field_indices(&self) -> LocalTableInContext<'_, usize> {
595 LocalTableInContext { hir_owner: self.hir_owner, data: &self.field_indices }
598 pub fn field_indices_mut(&mut self) -> LocalTableInContextMut<'_, usize> {
599 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.field_indices }
602 pub fn user_provided_types(&self) -> LocalTableInContext<'_, CanonicalUserType<'tcx>> {
603 LocalTableInContext { hir_owner: self.hir_owner, data: &self.user_provided_types }
606 pub fn user_provided_types_mut(
608 ) -> LocalTableInContextMut<'_, CanonicalUserType<'tcx>> {
609 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.user_provided_types }
612 pub fn node_types(&self) -> LocalTableInContext<'_, Ty<'tcx>> {
613 LocalTableInContext { hir_owner: self.hir_owner, data: &self.node_types }
616 pub fn node_types_mut(&mut self) -> LocalTableInContextMut<'_, Ty<'tcx>> {
617 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.node_types }
620 pub fn node_type(&self, id: hir::HirId) -> Ty<'tcx> {
621 self.node_type_opt(id).unwrap_or_else(|| {
622 bug!("node_type: no type for node `{}`", tls::with(|tcx| tcx.hir().node_to_string(id)))
626 pub fn node_type_opt(&self, id: hir::HirId) -> Option<Ty<'tcx>> {
627 validate_hir_id_for_typeck_results(self.hir_owner, id);
628 self.node_types.get(&id.local_id).cloned()
631 pub fn node_substs_mut(&mut self) -> LocalTableInContextMut<'_, SubstsRef<'tcx>> {
632 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.node_substs }
635 pub fn node_substs(&self, id: hir::HirId) -> SubstsRef<'tcx> {
636 validate_hir_id_for_typeck_results(self.hir_owner, id);
637 self.node_substs.get(&id.local_id).cloned().unwrap_or_else(|| InternalSubsts::empty())
640 pub fn node_substs_opt(&self, id: hir::HirId) -> Option<SubstsRef<'tcx>> {
641 validate_hir_id_for_typeck_results(self.hir_owner, id);
642 self.node_substs.get(&id.local_id).cloned()
645 // Returns the type of a pattern as a monotype. Like @expr_ty, this function
646 // doesn't provide type parameter substitutions.
647 pub fn pat_ty(&self, pat: &hir::Pat<'_>) -> Ty<'tcx> {
648 self.node_type(pat.hir_id)
651 // Returns the type of an expression as a monotype.
653 // NB (1): This is the PRE-ADJUSTMENT TYPE for the expression. That is, in
654 // some cases, we insert `Adjustment` annotations such as auto-deref or
655 // auto-ref. The type returned by this function does not consider such
656 // adjustments. See `expr_ty_adjusted()` instead.
658 // NB (2): This type doesn't provide type parameter substitutions; e.g., if you
659 // ask for the type of "id" in "id(3)", it will return "fn(&isize) -> isize"
660 // instead of "fn(ty) -> T with T = isize".
661 pub fn expr_ty(&self, expr: &hir::Expr<'_>) -> Ty<'tcx> {
662 self.node_type(expr.hir_id)
665 pub fn expr_ty_opt(&self, expr: &hir::Expr<'_>) -> Option<Ty<'tcx>> {
666 self.node_type_opt(expr.hir_id)
669 pub fn adjustments(&self) -> LocalTableInContext<'_, Vec<ty::adjustment::Adjustment<'tcx>>> {
670 LocalTableInContext { hir_owner: self.hir_owner, data: &self.adjustments }
673 pub fn adjustments_mut(
675 ) -> LocalTableInContextMut<'_, Vec<ty::adjustment::Adjustment<'tcx>>> {
676 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.adjustments }
679 pub fn expr_adjustments(&self, expr: &hir::Expr<'_>) -> &[ty::adjustment::Adjustment<'tcx>] {
680 validate_hir_id_for_typeck_results(self.hir_owner, expr.hir_id);
681 self.adjustments.get(&expr.hir_id.local_id).map_or(&[], |a| &a[..])
684 /// Returns the type of `expr`, considering any `Adjustment`
685 /// entry recorded for that expression.
686 pub fn expr_ty_adjusted(&self, expr: &hir::Expr<'_>) -> Ty<'tcx> {
687 self.expr_adjustments(expr).last().map_or_else(|| self.expr_ty(expr), |adj| adj.target)
690 pub fn expr_ty_adjusted_opt(&self, expr: &hir::Expr<'_>) -> Option<Ty<'tcx>> {
691 self.expr_adjustments(expr).last().map(|adj| adj.target).or_else(|| self.expr_ty_opt(expr))
694 pub fn is_method_call(&self, expr: &hir::Expr<'_>) -> bool {
695 // Only paths and method calls/overloaded operators have
696 // entries in type_dependent_defs, ignore the former here.
697 if let hir::ExprKind::Path(_) = expr.kind {
701 matches!(self.type_dependent_defs().get(expr.hir_id), Some(Ok((DefKind::AssocFn, _))))
704 pub fn extract_binding_mode(&self, s: &Session, id: HirId, sp: Span) -> Option<BindingMode> {
705 self.pat_binding_modes().get(id).copied().or_else(|| {
706 s.delay_span_bug(sp, "missing binding mode");
711 pub fn pat_binding_modes(&self) -> LocalTableInContext<'_, BindingMode> {
712 LocalTableInContext { hir_owner: self.hir_owner, data: &self.pat_binding_modes }
715 pub fn pat_binding_modes_mut(&mut self) -> LocalTableInContextMut<'_, BindingMode> {
716 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.pat_binding_modes }
719 pub fn pat_adjustments(&self) -> LocalTableInContext<'_, Vec<Ty<'tcx>>> {
720 LocalTableInContext { hir_owner: self.hir_owner, data: &self.pat_adjustments }
723 pub fn pat_adjustments_mut(&mut self) -> LocalTableInContextMut<'_, Vec<Ty<'tcx>>> {
724 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.pat_adjustments }
727 /// For a given closure, returns the iterator of `ty::CapturedPlace`s that are captured
729 pub fn closure_min_captures_flattened(
731 closure_def_id: DefId,
732 ) -> impl Iterator<Item = &ty::CapturedPlace<'tcx>> {
733 self.closure_min_captures
734 .get(&closure_def_id)
735 .map(|closure_min_captures| closure_min_captures.values().flat_map(|v| v.iter()))
740 pub fn closure_kind_origins(&self) -> LocalTableInContext<'_, (Span, HirPlace<'tcx>)> {
741 LocalTableInContext { hir_owner: self.hir_owner, data: &self.closure_kind_origins }
744 pub fn closure_kind_origins_mut(
746 ) -> LocalTableInContextMut<'_, (Span, HirPlace<'tcx>)> {
747 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.closure_kind_origins }
750 pub fn liberated_fn_sigs(&self) -> LocalTableInContext<'_, ty::FnSig<'tcx>> {
751 LocalTableInContext { hir_owner: self.hir_owner, data: &self.liberated_fn_sigs }
754 pub fn liberated_fn_sigs_mut(&mut self) -> LocalTableInContextMut<'_, ty::FnSig<'tcx>> {
755 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.liberated_fn_sigs }
758 pub fn fru_field_types(&self) -> LocalTableInContext<'_, Vec<Ty<'tcx>>> {
759 LocalTableInContext { hir_owner: self.hir_owner, data: &self.fru_field_types }
762 pub fn fru_field_types_mut(&mut self) -> LocalTableInContextMut<'_, Vec<Ty<'tcx>>> {
763 LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.fru_field_types }
766 pub fn is_coercion_cast(&self, hir_id: hir::HirId) -> bool {
767 validate_hir_id_for_typeck_results(self.hir_owner, hir_id);
768 self.coercion_casts.contains(&hir_id.local_id)
771 pub fn set_coercion_cast(&mut self, id: ItemLocalId) {
772 self.coercion_casts.insert(id);
775 pub fn coercion_casts(&self) -> &ItemLocalSet {
780 impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for TypeckResults<'tcx> {
781 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
782 let ty::TypeckResults {
784 ref type_dependent_defs,
786 ref user_provided_types,
787 ref user_provided_sigs,
791 ref pat_binding_modes,
793 ref closure_kind_origins,
794 ref liberated_fn_sigs,
797 ref used_trait_imports,
799 ref concrete_opaque_types,
800 ref closure_min_captures,
801 ref closure_fake_reads,
802 ref generator_interior_types,
803 ref treat_byte_string_as_slice,
804 ref closure_size_eval,
807 hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
808 hcx.local_def_path_hash(hir_owner);
810 type_dependent_defs.hash_stable(hcx, hasher);
811 field_indices.hash_stable(hcx, hasher);
812 user_provided_types.hash_stable(hcx, hasher);
813 user_provided_sigs.hash_stable(hcx, hasher);
814 node_types.hash_stable(hcx, hasher);
815 node_substs.hash_stable(hcx, hasher);
816 adjustments.hash_stable(hcx, hasher);
817 pat_binding_modes.hash_stable(hcx, hasher);
818 pat_adjustments.hash_stable(hcx, hasher);
820 closure_kind_origins.hash_stable(hcx, hasher);
821 liberated_fn_sigs.hash_stable(hcx, hasher);
822 fru_field_types.hash_stable(hcx, hasher);
823 coercion_casts.hash_stable(hcx, hasher);
824 used_trait_imports.hash_stable(hcx, hasher);
825 tainted_by_errors.hash_stable(hcx, hasher);
826 concrete_opaque_types.hash_stable(hcx, hasher);
827 closure_min_captures.hash_stable(hcx, hasher);
828 closure_fake_reads.hash_stable(hcx, hasher);
829 generator_interior_types.hash_stable(hcx, hasher);
830 treat_byte_string_as_slice.hash_stable(hcx, hasher);
831 closure_size_eval.hash_stable(hcx, hasher);
836 rustc_index::newtype_index! {
837 pub struct UserTypeAnnotationIndex {
839 DEBUG_FORMAT = "UserType({})",
840 const START_INDEX = 0,
844 /// Mapping of type annotation indices to canonical user type annotations.
845 pub type CanonicalUserTypeAnnotations<'tcx> =
846 IndexVec<UserTypeAnnotationIndex, CanonicalUserTypeAnnotation<'tcx>>;
848 #[derive(Clone, Debug, TyEncodable, TyDecodable, HashStable, TypeFoldable, Lift)]
849 pub struct CanonicalUserTypeAnnotation<'tcx> {
850 pub user_ty: CanonicalUserType<'tcx>,
852 pub inferred_ty: Ty<'tcx>,
855 /// Canonicalized user type annotation.
856 pub type CanonicalUserType<'tcx> = Canonical<'tcx, UserType<'tcx>>;
858 impl<'tcx> CanonicalUserType<'tcx> {
859 /// Returns `true` if this represents a substitution of the form `[?0, ?1, ?2]`,
860 /// i.e., each thing is mapped to a canonical variable with the same index.
861 pub fn is_identity(&self) -> bool {
863 UserType::Ty(_) => false,
864 UserType::TypeOf(_, user_substs) => {
865 if user_substs.user_self_ty.is_some() {
869 iter::zip(user_substs.substs, BoundVar::new(0)..).all(|(kind, cvar)| {
870 match kind.unpack() {
871 GenericArgKind::Type(ty) => match ty.kind() {
872 ty::Bound(debruijn, b) => {
873 // We only allow a `ty::INNERMOST` index in substitutions.
874 assert_eq!(*debruijn, ty::INNERMOST);
880 GenericArgKind::Lifetime(r) => match *r {
881 ty::ReLateBound(debruijn, br) => {
882 // We only allow a `ty::INNERMOST` index in substitutions.
883 assert_eq!(debruijn, ty::INNERMOST);
889 GenericArgKind::Const(ct) => match ct.val() {
890 ty::ConstKind::Bound(debruijn, b) => {
891 // We only allow a `ty::INNERMOST` index in substitutions.
892 assert_eq!(debruijn, ty::INNERMOST);
904 /// A user-given type annotation attached to a constant. These arise
905 /// from constants that are named via paths, like `Foo::<A>::new` and
907 #[derive(Copy, Clone, Debug, PartialEq, TyEncodable, TyDecodable)]
908 #[derive(HashStable, TypeFoldable, Lift)]
909 pub enum UserType<'tcx> {
912 /// The canonical type is the result of `type_of(def_id)` with the
913 /// given substitutions applied.
914 TypeOf(DefId, UserSubsts<'tcx>),
917 impl<'tcx> CommonTypes<'tcx> {
919 interners: &CtxtInterners<'tcx>,
921 resolutions: &ty::ResolverOutputs,
922 ) -> CommonTypes<'tcx> {
923 let mk = |ty| interners.intern_ty(ty, sess, resolutions);
926 unit: mk(Tuple(List::empty())),
930 isize: mk(Int(ty::IntTy::Isize)),
931 i8: mk(Int(ty::IntTy::I8)),
932 i16: mk(Int(ty::IntTy::I16)),
933 i32: mk(Int(ty::IntTy::I32)),
934 i64: mk(Int(ty::IntTy::I64)),
935 i128: mk(Int(ty::IntTy::I128)),
936 usize: mk(Uint(ty::UintTy::Usize)),
937 u8: mk(Uint(ty::UintTy::U8)),
938 u16: mk(Uint(ty::UintTy::U16)),
939 u32: mk(Uint(ty::UintTy::U32)),
940 u64: mk(Uint(ty::UintTy::U64)),
941 u128: mk(Uint(ty::UintTy::U128)),
942 f32: mk(Float(ty::FloatTy::F32)),
943 f64: mk(Float(ty::FloatTy::F64)),
945 self_param: mk(ty::Param(ty::ParamTy { index: 0, name: kw::SelfUpper })),
947 trait_object_dummy_self: mk(Infer(ty::FreshTy(0))),
952 impl<'tcx> CommonLifetimes<'tcx> {
953 fn new(interners: &CtxtInterners<'tcx>) -> CommonLifetimes<'tcx> {
955 Region(Interned::new_unchecked(
956 interners.region.intern(r, |r| InternedInSet(interners.arena.alloc(r))).0,
961 re_root_empty: mk(ty::ReEmpty(ty::UniverseIndex::ROOT)),
962 re_static: mk(ty::ReStatic),
963 re_erased: mk(ty::ReErased),
968 impl<'tcx> CommonConsts<'tcx> {
969 fn new(interners: &CtxtInterners<'tcx>, types: &CommonTypes<'tcx>) -> CommonConsts<'tcx> {
971 Const(Interned::new_unchecked(
972 interners.const_.intern(c, |c| InternedInSet(interners.arena.alloc(c))).0,
977 unit: mk_const(ty::ConstS {
978 val: ty::ConstKind::Value(ConstValue::Scalar(Scalar::ZST)),
985 // This struct contains information regarding the `ReFree(FreeRegion)` corresponding to a lifetime
988 pub struct FreeRegionInfo {
989 // `LocalDefId` corresponding to FreeRegion
990 pub def_id: LocalDefId,
991 // the bound region corresponding to FreeRegion
992 pub boundregion: ty::BoundRegionKind,
993 // checks if bound region is in Impl Item
994 pub is_impl_item: bool,
997 /// The central data structure of the compiler. It stores references
998 /// to the various **arenas** and also houses the results of the
999 /// various **compiler queries** that have been performed. See the
1000 /// [rustc dev guide] for more details.
1002 /// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/ty.html
1003 #[derive(Copy, Clone)]
1004 #[rustc_diagnostic_item = "TyCtxt"]
1005 #[rustc_pass_by_value]
1006 pub struct TyCtxt<'tcx> {
1007 gcx: &'tcx GlobalCtxt<'tcx>,
1010 impl<'tcx> Deref for TyCtxt<'tcx> {
1011 type Target = &'tcx GlobalCtxt<'tcx>;
1013 fn deref(&self) -> &Self::Target {
1018 pub struct GlobalCtxt<'tcx> {
1019 pub arena: &'tcx WorkerLocal<Arena<'tcx>>,
1021 interners: CtxtInterners<'tcx>,
1023 pub sess: &'tcx Session,
1025 /// This only ever stores a `LintStore` but we don't want a dependency on that type here.
1027 /// FIXME(Centril): consider `dyn LintStoreMarker` once
1028 /// we can upcast to `Any` for some additional type safety.
1029 pub lint_store: Lrc<dyn Any + sync::Sync + sync::Send>,
1031 pub dep_graph: DepGraph,
1033 pub prof: SelfProfilerRef,
1035 /// Common types, pre-interned for your convenience.
1036 pub types: CommonTypes<'tcx>,
1038 /// Common lifetimes, pre-interned for your convenience.
1039 pub lifetimes: CommonLifetimes<'tcx>,
1041 /// Common consts, pre-interned for your convenience.
1042 pub consts: CommonConsts<'tcx>,
1044 /// Output of the resolver.
1045 pub(crate) untracked_resolutions: ty::ResolverOutputs,
1047 pub(crate) untracked_crate: &'tcx hir::Crate<'tcx>,
1049 /// This provides access to the incremental compilation on-disk cache for query results.
1050 /// Do not access this directly. It is only meant to be used by
1051 /// `DepGraph::try_mark_green()` and the query infrastructure.
1052 /// This is `None` if we are not incremental compilation mode
1053 pub on_disk_cache: Option<&'tcx dyn OnDiskCache<'tcx>>,
1055 pub queries: &'tcx dyn query::QueryEngine<'tcx>,
1056 pub query_caches: query::QueryCaches<'tcx>,
1057 query_kinds: &'tcx [DepKindStruct],
1059 // Internal caches for metadata decoding. No need to track deps on this.
1060 pub ty_rcache: Lock<FxHashMap<ty::CReaderCacheKey, Ty<'tcx>>>,
1061 pub pred_rcache: Lock<FxHashMap<ty::CReaderCacheKey, Predicate<'tcx>>>,
1063 /// Caches the results of trait selection. This cache is used
1064 /// for things that do not have to do with the parameters in scope.
1065 pub selection_cache: traits::SelectionCache<'tcx>,
1067 /// Caches the results of trait evaluation. This cache is used
1068 /// for things that do not have to do with the parameters in scope.
1069 /// Merge this with `selection_cache`?
1070 pub evaluation_cache: traits::EvaluationCache<'tcx>,
1072 /// The definite name of the current crate after taking into account
1073 /// attributes, commandline parameters, etc.
1076 /// Data layout specification for the current target.
1077 pub data_layout: TargetDataLayout,
1079 /// Stores memory for globals (statics/consts).
1080 pub(crate) alloc_map: Lock<interpret::AllocMap<'tcx>>,
1082 output_filenames: Arc<OutputFilenames>,
1085 impl<'tcx> TyCtxt<'tcx> {
1086 pub fn typeck_opt_const_arg(
1088 def: ty::WithOptConstParam<LocalDefId>,
1089 ) -> &'tcx TypeckResults<'tcx> {
1090 if let Some(param_did) = def.const_param_did {
1091 self.typeck_const_arg((def.did, param_did))
1093 self.typeck(def.did)
1097 pub fn mir_borrowck_opt_const_arg(
1099 def: ty::WithOptConstParam<LocalDefId>,
1100 ) -> &'tcx BorrowCheckResult<'tcx> {
1101 if let Some(param_did) = def.const_param_did {
1102 self.mir_borrowck_const_arg((def.did, param_did))
1104 self.mir_borrowck(def.did)
1108 pub fn alloc_steal_thir(self, thir: Thir<'tcx>) -> &'tcx Steal<Thir<'tcx>> {
1109 self.arena.alloc(Steal::new(thir))
1112 pub fn alloc_steal_mir(self, mir: Body<'tcx>) -> &'tcx Steal<Body<'tcx>> {
1113 self.arena.alloc(Steal::new(mir))
1116 pub fn alloc_steal_promoted(
1118 promoted: IndexVec<Promoted, Body<'tcx>>,
1119 ) -> &'tcx Steal<IndexVec<Promoted, Body<'tcx>>> {
1120 self.arena.alloc(Steal::new(promoted))
1123 pub fn alloc_adt_def(
1127 variants: IndexVec<VariantIdx, ty::VariantDef>,
1129 ) -> ty::AdtDef<'tcx> {
1130 self.intern_adt_def(ty::AdtDefData::new(self, did, kind, variants, repr))
1133 /// Allocates a read-only byte or string literal for `mir::interpret`.
1134 pub fn allocate_bytes(self, bytes: &[u8]) -> interpret::AllocId {
1135 // Create an allocation that just contains these bytes.
1136 let alloc = interpret::Allocation::from_bytes_byte_aligned_immutable(bytes);
1137 let alloc = self.intern_const_alloc(alloc);
1138 self.create_memory_alloc(alloc)
1141 /// Returns a range of the start/end indices specified with the
1142 /// `rustc_layout_scalar_valid_range` attribute.
1143 // FIXME(eddyb) this is an awkward spot for this method, maybe move it?
1144 pub fn layout_scalar_valid_range(self, def_id: DefId) -> (Bound<u128>, Bound<u128>) {
1145 let attrs = self.get_attrs(def_id);
1147 let Some(attr) = attrs.iter().find(|a| a.has_name(name)) else {
1148 return Bound::Unbounded;
1150 debug!("layout_scalar_valid_range: attr={:?}", attr);
1153 ast::NestedMetaItem::Literal(ast::Lit {
1154 kind: ast::LitKind::Int(a, _), ..
1157 ) = attr.meta_item_list().as_deref()
1162 .delay_span_bug(attr.span, "invalid rustc_layout_scalar_valid_range attribute");
1167 get(sym::rustc_layout_scalar_valid_range_start),
1168 get(sym::rustc_layout_scalar_valid_range_end),
1172 pub fn lift<T: Lift<'tcx>>(self, value: T) -> Option<T::Lifted> {
1173 value.lift_to_tcx(self)
1176 /// Creates a type context and call the closure with a `TyCtxt` reference
1177 /// to the context. The closure enforces that the type context and any interned
1178 /// value (types, substs, etc.) can only be used while `ty::tls` has a valid
1179 /// reference to the context, to allow formatting values that need it.
1180 pub fn create_global_ctxt(
1182 lint_store: Lrc<dyn Any + sync::Send + sync::Sync>,
1183 arena: &'tcx WorkerLocal<Arena<'tcx>>,
1184 resolutions: ty::ResolverOutputs,
1185 krate: &'tcx hir::Crate<'tcx>,
1186 dep_graph: DepGraph,
1187 on_disk_cache: Option<&'tcx dyn OnDiskCache<'tcx>>,
1188 queries: &'tcx dyn query::QueryEngine<'tcx>,
1189 query_kinds: &'tcx [DepKindStruct],
1191 output_filenames: OutputFilenames,
1192 ) -> GlobalCtxt<'tcx> {
1193 let data_layout = TargetDataLayout::parse(&s.target).unwrap_or_else(|err| {
1196 let interners = CtxtInterners::new(arena);
1197 let common_types = CommonTypes::new(&interners, s, &resolutions);
1198 let common_lifetimes = CommonLifetimes::new(&interners);
1199 let common_consts = CommonConsts::new(&interners, &common_types);
1207 untracked_resolutions: resolutions,
1208 prof: s.prof.clone(),
1209 types: common_types,
1210 lifetimes: common_lifetimes,
1211 consts: common_consts,
1212 untracked_crate: krate,
1215 query_caches: query::QueryCaches::default(),
1217 ty_rcache: Default::default(),
1218 pred_rcache: Default::default(),
1219 selection_cache: Default::default(),
1220 evaluation_cache: Default::default(),
1221 crate_name: Symbol::intern(crate_name),
1223 alloc_map: Lock::new(interpret::AllocMap::new()),
1224 output_filenames: Arc::new(output_filenames),
1228 crate fn query_kind(self, k: DepKind) -> &'tcx DepKindStruct {
1229 &self.query_kinds[k as usize]
1232 /// Constructs a `TyKind::Error` type and registers a `delay_span_bug` to ensure it gets used.
1234 pub fn ty_error(self) -> Ty<'tcx> {
1235 self.ty_error_with_message(DUMMY_SP, "TyKind::Error constructed but no error reported")
1238 /// Constructs a `TyKind::Error` type and registers a `delay_span_bug` with the given `msg` to
1239 /// ensure it gets used.
1241 pub fn ty_error_with_message<S: Into<MultiSpan>>(self, span: S, msg: &str) -> Ty<'tcx> {
1242 let reported = self.sess.delay_span_bug(span, msg);
1243 self.mk_ty(Error(DelaySpanBugEmitted { reported, _priv: () }))
1246 /// Like [TyCtxt::ty_error] but for constants.
1248 pub fn const_error(self, ty: Ty<'tcx>) -> Const<'tcx> {
1249 self.const_error_with_message(
1252 "ty::ConstKind::Error constructed but no error reported",
1256 /// Like [TyCtxt::ty_error_with_message] but for constants.
1258 pub fn const_error_with_message<S: Into<MultiSpan>>(
1264 let reported = self.sess.delay_span_bug(span, msg);
1265 self.mk_const(ty::ConstS {
1266 val: ty::ConstKind::Error(DelaySpanBugEmitted { reported, _priv: () }),
1271 pub fn consider_optimizing<T: Fn() -> String>(self, msg: T) -> bool {
1272 let cname = self.crate_name(LOCAL_CRATE);
1273 self.sess.consider_optimizing(cname.as_str(), msg)
1276 /// Obtain all lang items of this crate and all dependencies (recursively)
1277 pub fn lang_items(self) -> &'tcx rustc_hir::lang_items::LanguageItems {
1278 self.get_lang_items(())
1281 /// Obtain the given diagnostic item's `DefId`. Use `is_diagnostic_item` if you just want to
1282 /// compare against another `DefId`, since `is_diagnostic_item` is cheaper.
1283 pub fn get_diagnostic_item(self, name: Symbol) -> Option<DefId> {
1284 self.all_diagnostic_items(()).name_to_id.get(&name).copied()
1287 /// Obtain the diagnostic item's name
1288 pub fn get_diagnostic_name(self, id: DefId) -> Option<Symbol> {
1289 self.diagnostic_items(id.krate).id_to_name.get(&id).copied()
1292 /// Check whether the diagnostic item with the given `name` has the given `DefId`.
1293 pub fn is_diagnostic_item(self, name: Symbol, did: DefId) -> bool {
1294 self.diagnostic_items(did.krate).name_to_id.get(&name) == Some(&did)
1297 pub fn stability(self) -> &'tcx stability::Index {
1298 self.stability_index(())
1301 pub fn features(self) -> &'tcx rustc_feature::Features {
1302 self.features_query(())
1305 pub fn def_key(self, id: DefId) -> rustc_hir::definitions::DefKey {
1306 // Accessing the DefKey is ok, since it is part of DefPathHash.
1307 if let Some(id) = id.as_local() {
1308 self.untracked_resolutions.definitions.def_key(id)
1310 self.untracked_resolutions.cstore.def_key(id)
1314 /// Converts a `DefId` into its fully expanded `DefPath` (every
1315 /// `DefId` is really just an interned `DefPath`).
1317 /// Note that if `id` is not local to this crate, the result will
1318 /// be a non-local `DefPath`.
1319 pub fn def_path(self, id: DefId) -> rustc_hir::definitions::DefPath {
1320 // Accessing the DefPath is ok, since it is part of DefPathHash.
1321 if let Some(id) = id.as_local() {
1322 self.untracked_resolutions.definitions.def_path(id)
1324 self.untracked_resolutions.cstore.def_path(id)
1329 pub fn def_path_hash(self, def_id: DefId) -> rustc_hir::definitions::DefPathHash {
1330 // Accessing the DefPathHash is ok, it is incr. comp. stable.
1331 if let Some(def_id) = def_id.as_local() {
1332 self.untracked_resolutions.definitions.def_path_hash(def_id)
1334 self.untracked_resolutions.cstore.def_path_hash(def_id)
1339 pub fn stable_crate_id(self, crate_num: CrateNum) -> StableCrateId {
1340 if crate_num == LOCAL_CRATE {
1341 self.sess.local_stable_crate_id()
1343 self.untracked_resolutions.cstore.stable_crate_id(crate_num)
1347 /// Maps a StableCrateId to the corresponding CrateNum. This method assumes
1348 /// that the crate in question has already been loaded by the CrateStore.
1350 pub fn stable_crate_id_to_crate_num(self, stable_crate_id: StableCrateId) -> CrateNum {
1351 if stable_crate_id == self.sess.local_stable_crate_id() {
1354 self.untracked_resolutions.cstore.stable_crate_id_to_crate_num(stable_crate_id)
1358 /// Converts a `DefPathHash` to its corresponding `DefId` in the current compilation
1359 /// session, if it still exists. This is used during incremental compilation to
1360 /// turn a deserialized `DefPathHash` into its current `DefId`.
1361 pub fn def_path_hash_to_def_id(self, hash: DefPathHash, err: &mut dyn FnMut() -> !) -> DefId {
1362 debug!("def_path_hash_to_def_id({:?})", hash);
1364 let stable_crate_id = hash.stable_crate_id();
1366 // If this is a DefPathHash from the local crate, we can look up the
1367 // DefId in the tcx's `Definitions`.
1368 if stable_crate_id == self.sess.local_stable_crate_id() {
1369 self.untracked_resolutions
1371 .local_def_path_hash_to_def_id(hash, err)
1374 // If this is a DefPathHash from an upstream crate, let the CrateStore map
1376 let cstore = &self.untracked_resolutions.cstore;
1377 let cnum = cstore.stable_crate_id_to_crate_num(stable_crate_id);
1378 cstore.def_path_hash_to_def_id(cnum, hash)
1382 pub fn def_path_debug_str(self, def_id: DefId) -> String {
1383 // We are explicitly not going through queries here in order to get
1384 // crate name and stable crate id since this code is called from debug!()
1385 // statements within the query system and we'd run into endless
1386 // recursion otherwise.
1387 let (crate_name, stable_crate_id) = if def_id.is_local() {
1388 (self.crate_name, self.sess.local_stable_crate_id())
1390 let cstore = &self.untracked_resolutions.cstore;
1391 (cstore.crate_name(def_id.krate), cstore.stable_crate_id(def_id.krate))
1397 // Don't print the whole stable crate id. That's just
1398 // annoying in debug output.
1399 &(format!("{:08x}", stable_crate_id.to_u64()))[..4],
1400 self.def_path(def_id).to_string_no_crate_verbose()
1404 /// Note that this is *untracked* and should only be used within the query
1405 /// system if the result is otherwise tracked through queries
1406 pub fn cstore_untracked(self) -> &'tcx ty::CrateStoreDyn {
1407 &*self.untracked_resolutions.cstore
1410 /// Note that this is *untracked* and should only be used within the query
1411 /// system if the result is otherwise tracked through queries
1412 pub fn definitions_untracked(self) -> &'tcx hir::definitions::Definitions {
1413 &self.untracked_resolutions.definitions
1417 pub fn create_stable_hashing_context(self) -> StableHashingContext<'tcx> {
1418 let resolutions = &self.gcx.untracked_resolutions;
1419 StableHashingContext::new(self.sess, &resolutions.definitions, &*resolutions.cstore)
1423 pub fn create_no_span_stable_hashing_context(self) -> StableHashingContext<'tcx> {
1424 let resolutions = &self.gcx.untracked_resolutions;
1425 StableHashingContext::ignore_spans(
1427 &resolutions.definitions,
1428 &*resolutions.cstore,
1432 pub fn serialize_query_result_cache(self, encoder: &mut FileEncoder) -> FileEncodeResult {
1433 self.on_disk_cache.as_ref().map_or(Ok(()), |c| c.serialize(self, encoder))
1436 /// If `true`, we should use the MIR-based borrowck, but also
1437 /// fall back on the AST borrowck if the MIR-based one errors.
1438 pub fn migrate_borrowck(self) -> bool {
1439 self.borrowck_mode().migrate()
1442 /// What mode(s) of borrowck should we run? AST? MIR? both?
1443 /// (Also considers the `#![feature(nll)]` setting.)
1444 pub fn borrowck_mode(self) -> BorrowckMode {
1445 // Here are the main constraints we need to deal with:
1447 // 1. An opts.borrowck_mode of `BorrowckMode::Migrate` is
1448 // synonymous with no `-Z borrowck=...` flag at all.
1450 // 2. We want to allow developers on the Nightly channel
1451 // to opt back into the "hard error" mode for NLL,
1452 // (which they can do via specifying `#![feature(nll)]`
1453 // explicitly in their crate).
1455 // So, this precedence list is how pnkfelix chose to work with
1456 // the above constraints:
1458 // * `#![feature(nll)]` *always* means use NLL with hard
1459 // errors. (To simplify the code here, it now even overrides
1460 // a user's attempt to specify `-Z borrowck=compare`, which
1461 // we arguably do not need anymore and should remove.)
1463 // * Otherwise, if no `-Z borrowck=...` then use migrate mode
1465 // * Otherwise, use the behavior requested via `-Z borrowck=...`
1467 if self.features().nll {
1468 return BorrowckMode::Mir;
1471 self.sess.opts.borrowck_mode
1474 /// If `true`, we should use lazy normalization for constants, otherwise
1475 /// we still evaluate them eagerly.
1477 pub fn lazy_normalization(self) -> bool {
1478 let features = self.features();
1479 // Note: We only use lazy normalization for generic const expressions.
1480 features.generic_const_exprs
1484 pub fn local_crate_exports_generics(self) -> bool {
1485 debug_assert!(self.sess.opts.share_generics());
1487 self.sess.crate_types().iter().any(|crate_type| {
1489 CrateType::Executable
1490 | CrateType::Staticlib
1491 | CrateType::ProcMacro
1492 | CrateType::Cdylib => false,
1494 // FIXME rust-lang/rust#64319, rust-lang/rust#64872:
1495 // We want to block export of generics from dylibs,
1496 // but we must fix rust-lang/rust#65890 before we can
1497 // do that robustly.
1498 CrateType::Dylib => true,
1500 CrateType::Rlib => true,
1505 // Returns the `DefId` and the `BoundRegionKind` corresponding to the given region.
1506 pub fn is_suitable_region(self, region: Region<'tcx>) -> Option<FreeRegionInfo> {
1507 let (suitable_region_binding_scope, bound_region) = match *region {
1508 ty::ReFree(ref free_region) => {
1509 (free_region.scope.expect_local(), free_region.bound_region)
1511 ty::ReEarlyBound(ref ebr) => (
1512 self.parent(ebr.def_id).unwrap().expect_local(),
1513 ty::BoundRegionKind::BrNamed(ebr.def_id, ebr.name),
1515 _ => return None, // not a free region
1518 let is_impl_item = match self.hir().find_by_def_id(suitable_region_binding_scope) {
1519 Some(Node::Item(..) | Node::TraitItem(..)) => false,
1520 Some(Node::ImplItem(..)) => {
1521 self.is_bound_region_in_impl_item(suitable_region_binding_scope)
1526 Some(FreeRegionInfo {
1527 def_id: suitable_region_binding_scope,
1528 boundregion: bound_region,
1533 /// Given a `DefId` for an `fn`, return all the `dyn` and `impl` traits in its return type.
1534 pub fn return_type_impl_or_dyn_traits(
1536 scope_def_id: LocalDefId,
1537 ) -> Vec<&'tcx hir::Ty<'tcx>> {
1538 let hir_id = self.hir().local_def_id_to_hir_id(scope_def_id);
1539 let Some(hir::FnDecl { output: hir::FnRetTy::Return(hir_output), .. }) = self.hir().fn_decl_by_hir_id(hir_id) else {
1543 let mut v = TraitObjectVisitor(vec![], self.hir());
1544 v.visit_ty(hir_output);
1548 pub fn return_type_impl_trait(self, scope_def_id: LocalDefId) -> Option<(Ty<'tcx>, Span)> {
1549 // `type_of()` will fail on these (#55796, #86483), so only allow `fn`s or closures.
1550 match self.hir().get_by_def_id(scope_def_id) {
1551 Node::Item(&hir::Item { kind: ItemKind::Fn(..), .. }) => {}
1552 Node::TraitItem(&hir::TraitItem { kind: TraitItemKind::Fn(..), .. }) => {}
1553 Node::ImplItem(&hir::ImplItem { kind: ImplItemKind::Fn(..), .. }) => {}
1554 Node::Expr(&hir::Expr { kind: ExprKind::Closure(..), .. }) => {}
1558 let ret_ty = self.type_of(scope_def_id);
1559 match ret_ty.kind() {
1560 ty::FnDef(_, _) => {
1561 let sig = ret_ty.fn_sig(self);
1562 let output = self.erase_late_bound_regions(sig.output());
1563 if output.is_impl_trait() {
1564 let hir_id = self.hir().local_def_id_to_hir_id(scope_def_id);
1565 let fn_decl = self.hir().fn_decl_by_hir_id(hir_id).unwrap();
1566 Some((output, fn_decl.output.span()))
1575 // Checks if the bound region is in Impl Item.
1576 pub fn is_bound_region_in_impl_item(self, suitable_region_binding_scope: LocalDefId) -> bool {
1578 self.associated_item(suitable_region_binding_scope.to_def_id()).container.id();
1579 if self.impl_trait_ref(container_id).is_some() {
1580 // For now, we do not try to target impls of traits. This is
1581 // because this message is going to suggest that the user
1582 // change the fn signature, but they may not be free to do so,
1583 // since the signature must match the trait.
1585 // FIXME(#42706) -- in some cases, we could do better here.
1591 /// Determines whether identifiers in the assembly have strict naming rules.
1592 /// Currently, only NVPTX* targets need it.
1593 pub fn has_strict_asm_symbol_naming(self) -> bool {
1594 self.sess.target.arch.contains("nvptx")
1597 /// Returns `&'static core::panic::Location<'static>`.
1598 pub fn caller_location_ty(self) -> Ty<'tcx> {
1600 self.lifetimes.re_static,
1601 self.type_of(self.require_lang_item(LangItem::PanicLocation, None))
1602 .subst(self, self.mk_substs([self.lifetimes.re_static.into()].iter())),
1606 /// Returns a displayable description and article for the given `def_id` (e.g. `("a", "struct")`).
1607 pub fn article_and_description(self, def_id: DefId) -> (&'static str, &'static str) {
1608 match self.def_kind(def_id) {
1609 DefKind::Generator => match self.generator_kind(def_id).unwrap() {
1610 rustc_hir::GeneratorKind::Async(..) => ("an", "async closure"),
1611 rustc_hir::GeneratorKind::Gen => ("a", "generator"),
1613 def_kind => (def_kind.article(), def_kind.descr(def_id)),
1617 pub fn type_length_limit(self) -> Limit {
1618 self.limits(()).type_length_limit
1621 pub fn recursion_limit(self) -> Limit {
1622 self.limits(()).recursion_limit
1625 pub fn move_size_limit(self) -> Limit {
1626 self.limits(()).move_size_limit
1629 pub fn const_eval_limit(self) -> Limit {
1630 self.limits(()).const_eval_limit
1633 pub fn all_traits(self) -> impl Iterator<Item = DefId> + 'tcx {
1634 iter::once(LOCAL_CRATE)
1635 .chain(self.crates(()).iter().copied())
1636 .flat_map(move |cnum| self.traits_in_crate(cnum).iter().copied())
1640 /// A trait implemented for all `X<'a>` types that can be safely and
1641 /// efficiently converted to `X<'tcx>` as long as they are part of the
1642 /// provided `TyCtxt<'tcx>`.
1643 /// This can be done, for example, for `Ty<'tcx>` or `SubstsRef<'tcx>`
1644 /// by looking them up in their respective interners.
1646 /// However, this is still not the best implementation as it does
1647 /// need to compare the components, even for interned values.
1648 /// It would be more efficient if `TypedArena` provided a way to
1649 /// determine whether the address is in the allocated range.
1651 /// `None` is returned if the value or one of the components is not part
1652 /// of the provided context.
1653 /// For `Ty`, `None` can be returned if either the type interner doesn't
1654 /// contain the `TyKind` key or if the address of the interned
1655 /// pointer differs. The latter case is possible if a primitive type,
1656 /// e.g., `()` or `u8`, was interned in a different context.
1657 pub trait Lift<'tcx>: fmt::Debug {
1658 type Lifted: fmt::Debug + 'tcx;
1659 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted>;
1662 macro_rules! nop_lift {
1663 ($set:ident; $ty:ty => $lifted:ty) => {
1664 impl<'a, 'tcx> Lift<'tcx> for $ty {
1665 type Lifted = $lifted;
1666 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
1667 if tcx.interners.$set.contains_pointer_to(&InternedInSet(self.0.0)) {
1668 // SAFETY: `self` is interned and therefore valid
1669 // for the entire lifetime of the `TyCtxt`.
1670 Some(unsafe { mem::transmute(self) })
1679 // Can't use the macros as we have reuse the `substs` here.
1681 // See `intern_type_list` for more info.
1682 impl<'a, 'tcx> Lift<'tcx> for &'a List<Ty<'a>> {
1683 type Lifted = &'tcx List<Ty<'tcx>>;
1684 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
1685 if self.is_empty() {
1686 return Some(List::empty());
1688 if tcx.interners.substs.contains_pointer_to(&InternedInSet(self.as_substs())) {
1689 // SAFETY: `self` is interned and therefore valid
1690 // for the entire lifetime of the `TyCtxt`.
1691 Some(unsafe { mem::transmute::<&'a List<Ty<'a>>, &'tcx List<Ty<'tcx>>>(self) })
1698 macro_rules! nop_list_lift {
1699 ($set:ident; $ty:ty => $lifted:ty) => {
1700 impl<'a, 'tcx> Lift<'tcx> for &'a List<$ty> {
1701 type Lifted = &'tcx List<$lifted>;
1702 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
1703 if self.is_empty() {
1704 return Some(List::empty());
1706 if tcx.interners.$set.contains_pointer_to(&InternedInSet(self)) {
1707 Some(unsafe { mem::transmute(self) })
1716 nop_lift! {type_; Ty<'a> => Ty<'tcx>}
1717 nop_lift! {region; Region<'a> => Region<'tcx>}
1718 nop_lift! {const_; Const<'a> => Const<'tcx>}
1719 nop_lift! {const_allocation; ConstAllocation<'a> => ConstAllocation<'tcx>}
1720 nop_lift! {predicate; Predicate<'a> => Predicate<'tcx>}
1722 nop_list_lift! {poly_existential_predicates; ty::Binder<'a, ExistentialPredicate<'a>> => ty::Binder<'tcx, ExistentialPredicate<'tcx>>}
1723 nop_list_lift! {predicates; Predicate<'a> => Predicate<'tcx>}
1724 nop_list_lift! {canonical_var_infos; CanonicalVarInfo<'a> => CanonicalVarInfo<'tcx>}
1725 nop_list_lift! {projs; ProjectionKind => ProjectionKind}
1726 nop_list_lift! {bound_variable_kinds; ty::BoundVariableKind => ty::BoundVariableKind}
1728 // This is the impl for `&'a InternalSubsts<'a>`.
1729 nop_list_lift! {substs; GenericArg<'a> => GenericArg<'tcx>}
1731 CloneLiftImpls! { for<'tcx> { Constness, traits::WellFormedLoc, } }
1734 use super::{ptr_eq, GlobalCtxt, TyCtxt};
1736 use crate::dep_graph::TaskDepsRef;
1737 use crate::ty::query;
1738 use rustc_data_structures::sync::{self, Lock};
1739 use rustc_data_structures::thin_vec::ThinVec;
1740 use rustc_errors::Diagnostic;
1743 #[cfg(not(parallel_compiler))]
1744 use std::cell::Cell;
1746 #[cfg(parallel_compiler)]
1747 use rustc_rayon_core as rayon_core;
1749 /// This is the implicit state of rustc. It contains the current
1750 /// `TyCtxt` and query. It is updated when creating a local interner or
1751 /// executing a new query. Whenever there's a `TyCtxt` value available
1752 /// you should also have access to an `ImplicitCtxt` through the functions
1755 pub struct ImplicitCtxt<'a, 'tcx> {
1756 /// The current `TyCtxt`.
1757 pub tcx: TyCtxt<'tcx>,
1759 /// The current query job, if any. This is updated by `JobOwner::start` in
1760 /// `ty::query::plumbing` when executing a query.
1761 pub query: Option<query::QueryJobId>,
1763 /// Where to store diagnostics for the current query job, if any.
1764 /// This is updated by `JobOwner::start` in `ty::query::plumbing` when executing a query.
1765 pub diagnostics: Option<&'a Lock<ThinVec<Diagnostic>>>,
1767 /// Used to prevent layout from recursing too deeply.
1768 pub layout_depth: usize,
1770 /// The current dep graph task. This is used to add dependencies to queries
1771 /// when executing them.
1772 pub task_deps: TaskDepsRef<'a>,
1775 impl<'a, 'tcx> ImplicitCtxt<'a, 'tcx> {
1776 pub fn new(gcx: &'tcx GlobalCtxt<'tcx>) -> Self {
1777 let tcx = TyCtxt { gcx };
1783 task_deps: TaskDepsRef::Ignore,
1788 /// Sets Rayon's thread-local variable, which is preserved for Rayon jobs
1789 /// to `value` during the call to `f`. It is restored to its previous value after.
1790 /// This is used to set the pointer to the new `ImplicitCtxt`.
1791 #[cfg(parallel_compiler)]
1793 fn set_tlv<F: FnOnce() -> R, R>(value: usize, f: F) -> R {
1794 rayon_core::tlv::with(value, f)
1797 /// Gets Rayon's thread-local variable, which is preserved for Rayon jobs.
1798 /// This is used to get the pointer to the current `ImplicitCtxt`.
1799 #[cfg(parallel_compiler)]
1801 pub fn get_tlv() -> usize {
1802 rayon_core::tlv::get()
1805 #[cfg(not(parallel_compiler))]
1807 /// A thread local variable that stores a pointer to the current `ImplicitCtxt`.
1808 static TLV: Cell<usize> = const { Cell::new(0) };
1811 /// Sets TLV to `value` during the call to `f`.
1812 /// It is restored to its previous value after.
1813 /// This is used to set the pointer to the new `ImplicitCtxt`.
1814 #[cfg(not(parallel_compiler))]
1816 fn set_tlv<F: FnOnce() -> R, R>(value: usize, f: F) -> R {
1817 let old = get_tlv();
1818 let _reset = rustc_data_structures::OnDrop(move || TLV.with(|tlv| tlv.set(old)));
1819 TLV.with(|tlv| tlv.set(value));
1823 /// Gets the pointer to the current `ImplicitCtxt`.
1824 #[cfg(not(parallel_compiler))]
1826 fn get_tlv() -> usize {
1827 TLV.with(|tlv| tlv.get())
1830 /// Sets `context` as the new current `ImplicitCtxt` for the duration of the function `f`.
1832 pub fn enter_context<'a, 'tcx, F, R>(context: &ImplicitCtxt<'a, 'tcx>, f: F) -> R
1834 F: FnOnce(&ImplicitCtxt<'a, 'tcx>) -> R,
1836 set_tlv(context as *const _ as usize, || f(&context))
1839 /// Allows access to the current `ImplicitCtxt` in a closure if one is available.
1841 pub fn with_context_opt<F, R>(f: F) -> R
1843 F: for<'a, 'tcx> FnOnce(Option<&ImplicitCtxt<'a, 'tcx>>) -> R,
1845 let context = get_tlv();
1849 // We could get an `ImplicitCtxt` pointer from another thread.
1850 // Ensure that `ImplicitCtxt` is `Sync`.
1851 sync::assert_sync::<ImplicitCtxt<'_, '_>>();
1853 unsafe { f(Some(&*(context as *const ImplicitCtxt<'_, '_>))) }
1857 /// Allows access to the current `ImplicitCtxt`.
1858 /// Panics if there is no `ImplicitCtxt` available.
1860 pub fn with_context<F, R>(f: F) -> R
1862 F: for<'a, 'tcx> FnOnce(&ImplicitCtxt<'a, 'tcx>) -> R,
1864 with_context_opt(|opt_context| f(opt_context.expect("no ImplicitCtxt stored in tls")))
1867 /// Allows access to the current `ImplicitCtxt` whose tcx field is the same as the tcx argument
1868 /// passed in. This means the closure is given an `ImplicitCtxt` with the same `'tcx` lifetime
1869 /// as the `TyCtxt` passed in.
1870 /// This will panic if you pass it a `TyCtxt` which is different from the current
1871 /// `ImplicitCtxt`'s `tcx` field.
1873 pub fn with_related_context<'tcx, F, R>(tcx: TyCtxt<'tcx>, f: F) -> R
1875 F: FnOnce(&ImplicitCtxt<'_, 'tcx>) -> R,
1877 with_context(|context| unsafe {
1878 assert!(ptr_eq(context.tcx.gcx, tcx.gcx));
1879 let context: &ImplicitCtxt<'_, '_> = mem::transmute(context);
1884 /// Allows access to the `TyCtxt` in the current `ImplicitCtxt`.
1885 /// Panics if there is no `ImplicitCtxt` available.
1887 pub fn with<F, R>(f: F) -> R
1889 F: for<'tcx> FnOnce(TyCtxt<'tcx>) -> R,
1891 with_context(|context| f(context.tcx))
1894 /// Allows access to the `TyCtxt` in the current `ImplicitCtxt`.
1895 /// The closure is passed None if there is no `ImplicitCtxt` available.
1897 pub fn with_opt<F, R>(f: F) -> R
1899 F: for<'tcx> FnOnce(Option<TyCtxt<'tcx>>) -> R,
1901 with_context_opt(|opt_context| f(opt_context.map(|context| context.tcx)))
1905 macro_rules! sty_debug_print {
1906 ($fmt: expr, $ctxt: expr, $($variant: ident),*) => {{
1907 // Curious inner module to allow variant names to be used as
1909 #[allow(non_snake_case)]
1911 use crate::ty::{self, TyCtxt};
1912 use crate::ty::context::InternedInSet;
1914 #[derive(Copy, Clone)]
1923 pub fn go(fmt: &mut std::fmt::Formatter<'_>, tcx: TyCtxt<'_>) -> std::fmt::Result {
1924 let mut total = DebugStat {
1931 $(let mut $variant = total;)*
1933 let shards = tcx.interners.type_.lock_shards();
1934 let types = shards.iter().flat_map(|shard| shard.keys());
1935 for &InternedInSet(t) in types {
1936 let variant = match t.kind {
1937 ty::Bool | ty::Char | ty::Int(..) | ty::Uint(..) |
1938 ty::Float(..) | ty::Str | ty::Never => continue,
1939 ty::Error(_) => /* unimportant */ continue,
1940 $(ty::$variant(..) => &mut $variant,)*
1942 let lt = t.flags.intersects(ty::TypeFlags::HAS_RE_INFER);
1943 let ty = t.flags.intersects(ty::TypeFlags::HAS_TY_INFER);
1944 let ct = t.flags.intersects(ty::TypeFlags::HAS_CT_INFER);
1948 if lt { total.lt_infer += 1; variant.lt_infer += 1 }
1949 if ty { total.ty_infer += 1; variant.ty_infer += 1 }
1950 if ct { total.ct_infer += 1; variant.ct_infer += 1 }
1951 if lt && ty && ct { total.all_infer += 1; variant.all_infer += 1 }
1953 writeln!(fmt, "Ty interner total ty lt ct all")?;
1954 $(writeln!(fmt, " {:18}: {uses:6} {usespc:4.1}%, \
1955 {ty:4.1}% {lt:5.1}% {ct:4.1}% {all:4.1}%",
1956 stringify!($variant),
1957 uses = $variant.total,
1958 usespc = $variant.total as f64 * 100.0 / total.total as f64,
1959 ty = $variant.ty_infer as f64 * 100.0 / total.total as f64,
1960 lt = $variant.lt_infer as f64 * 100.0 / total.total as f64,
1961 ct = $variant.ct_infer as f64 * 100.0 / total.total as f64,
1962 all = $variant.all_infer as f64 * 100.0 / total.total as f64)?;
1964 writeln!(fmt, " total {uses:6} \
1965 {ty:4.1}% {lt:5.1}% {ct:4.1}% {all:4.1}%",
1967 ty = total.ty_infer as f64 * 100.0 / total.total as f64,
1968 lt = total.lt_infer as f64 * 100.0 / total.total as f64,
1969 ct = total.ct_infer as f64 * 100.0 / total.total as f64,
1970 all = total.all_infer as f64 * 100.0 / total.total as f64)
1974 inner::go($fmt, $ctxt)
1978 impl<'tcx> TyCtxt<'tcx> {
1979 pub fn debug_stats(self) -> impl std::fmt::Debug + 'tcx {
1980 struct DebugStats<'tcx>(TyCtxt<'tcx>);
1982 impl<'tcx> std::fmt::Debug for DebugStats<'tcx> {
1983 fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
2008 writeln!(fmt, "InternalSubsts interner: #{}", self.0.interners.substs.len())?;
2009 writeln!(fmt, "Region interner: #{}", self.0.interners.region.len())?;
2012 "Const Allocation interner: #{}",
2013 self.0.interners.const_allocation.len()
2015 writeln!(fmt, "Layout interner: #{}", self.0.interners.layout.len())?;
2025 // This type holds a `T` in the interner. The `T` is stored in the arena and
2026 // this type just holds a pointer to it, but it still effectively owns it. It
2027 // impls `Borrow` so that it can be looked up using the original
2028 // (non-arena-memory-owning) types.
2029 struct InternedInSet<'tcx, T: ?Sized>(&'tcx T);
2031 impl<'tcx, T: 'tcx + ?Sized> Clone for InternedInSet<'tcx, T> {
2032 fn clone(&self) -> Self {
2033 InternedInSet(self.0)
2037 impl<'tcx, T: 'tcx + ?Sized> Copy for InternedInSet<'tcx, T> {}
2039 impl<'tcx, T: 'tcx + ?Sized> IntoPointer for InternedInSet<'tcx, T> {
2040 fn into_pointer(&self) -> *const () {
2041 self.0 as *const _ as *const ()
2045 #[allow(rustc::usage_of_ty_tykind)]
2046 impl<'tcx> Borrow<TyKind<'tcx>> for InternedInSet<'tcx, TyS<'tcx>> {
2047 fn borrow<'a>(&'a self) -> &'a TyKind<'tcx> {
2052 impl<'tcx> PartialEq for InternedInSet<'tcx, TyS<'tcx>> {
2053 fn eq(&self, other: &InternedInSet<'tcx, TyS<'tcx>>) -> bool {
2054 // The `Borrow` trait requires that `x.borrow() == y.borrow()` equals
2056 self.0.kind == other.0.kind
2060 impl<'tcx> Eq for InternedInSet<'tcx, TyS<'tcx>> {}
2062 impl<'tcx> Hash for InternedInSet<'tcx, TyS<'tcx>> {
2063 fn hash<H: Hasher>(&self, s: &mut H) {
2064 // The `Borrow` trait requires that `x.borrow().hash(s) == x.hash(s)`.
2069 impl<'tcx> Borrow<Binder<'tcx, PredicateKind<'tcx>>> for InternedInSet<'tcx, PredicateS<'tcx>> {
2070 fn borrow<'a>(&'a self) -> &'a Binder<'tcx, PredicateKind<'tcx>> {
2075 impl<'tcx> PartialEq for InternedInSet<'tcx, PredicateS<'tcx>> {
2076 fn eq(&self, other: &InternedInSet<'tcx, PredicateS<'tcx>>) -> bool {
2077 // The `Borrow` trait requires that `x.borrow() == y.borrow()` equals
2079 self.0.kind == other.0.kind
2083 impl<'tcx> Eq for InternedInSet<'tcx, PredicateS<'tcx>> {}
2085 impl<'tcx> Hash for InternedInSet<'tcx, PredicateS<'tcx>> {
2086 fn hash<H: Hasher>(&self, s: &mut H) {
2087 // The `Borrow` trait requires that `x.borrow().hash(s) == x.hash(s)`.
2092 impl<'tcx, T> Borrow<[T]> for InternedInSet<'tcx, List<T>> {
2093 fn borrow<'a>(&'a self) -> &'a [T] {
2098 impl<'tcx, T: PartialEq> PartialEq for InternedInSet<'tcx, List<T>> {
2099 fn eq(&self, other: &InternedInSet<'tcx, List<T>>) -> bool {
2100 // The `Borrow` trait requires that `x.borrow() == y.borrow()` equals
2102 self.0[..] == other.0[..]
2106 impl<'tcx, T: Eq> Eq for InternedInSet<'tcx, List<T>> {}
2108 impl<'tcx, T: Hash> Hash for InternedInSet<'tcx, List<T>> {
2109 fn hash<H: Hasher>(&self, s: &mut H) {
2110 // The `Borrow` trait requires that `x.borrow().hash(s) == x.hash(s)`.
2115 macro_rules! direct_interners {
2116 ($($name:ident: $method:ident($ty:ty): $ret_ctor:ident -> $ret_ty:ty,)+) => {
2117 $(impl<'tcx> Borrow<$ty> for InternedInSet<'tcx, $ty> {
2118 fn borrow<'a>(&'a self) -> &'a $ty {
2123 impl<'tcx> PartialEq for InternedInSet<'tcx, $ty> {
2124 fn eq(&self, other: &Self) -> bool {
2125 // The `Borrow` trait requires that `x.borrow() == y.borrow()`
2131 impl<'tcx> Eq for InternedInSet<'tcx, $ty> {}
2133 impl<'tcx> Hash for InternedInSet<'tcx, $ty> {
2134 fn hash<H: Hasher>(&self, s: &mut H) {
2135 // The `Borrow` trait requires that `x.borrow().hash(s) ==
2141 impl<'tcx> TyCtxt<'tcx> {
2142 pub fn $method(self, v: $ty) -> $ret_ty {
2143 $ret_ctor(Interned::new_unchecked(self.interners.$name.intern(v, |v| {
2144 InternedInSet(self.interners.arena.alloc(v))
2152 region: mk_region(RegionKind): Region -> Region<'tcx>,
2153 const_: mk_const(ConstS<'tcx>): Const -> Const<'tcx>,
2154 const_allocation: intern_const_alloc(Allocation): ConstAllocation -> ConstAllocation<'tcx>,
2155 layout: intern_layout(LayoutS<'tcx>): Layout -> Layout<'tcx>,
2156 adt_def: intern_adt_def(AdtDefData): AdtDef -> AdtDef<'tcx>,
2159 macro_rules! slice_interners {
2160 ($($field:ident: $method:ident($ty:ty)),+ $(,)?) => (
2161 impl<'tcx> TyCtxt<'tcx> {
2162 $(pub fn $method(self, v: &[$ty]) -> &'tcx List<$ty> {
2163 self.interners.$field.intern_ref(v, || {
2164 InternedInSet(List::from_arena(&*self.arena, v))
2172 substs: _intern_substs(GenericArg<'tcx>),
2173 canonical_var_infos: _intern_canonical_var_infos(CanonicalVarInfo<'tcx>),
2174 poly_existential_predicates:
2175 _intern_poly_existential_predicates(ty::Binder<'tcx, ExistentialPredicate<'tcx>>),
2176 predicates: _intern_predicates(Predicate<'tcx>),
2177 projs: _intern_projs(ProjectionKind),
2178 place_elems: _intern_place_elems(PlaceElem<'tcx>),
2179 bound_variable_kinds: _intern_bound_variable_kinds(ty::BoundVariableKind),
2182 impl<'tcx> TyCtxt<'tcx> {
2183 /// Given a `fn` type, returns an equivalent `unsafe fn` type;
2184 /// that is, a `fn` type that is equivalent in every way for being
2186 pub fn safe_to_unsafe_fn_ty(self, sig: PolyFnSig<'tcx>) -> Ty<'tcx> {
2187 assert_eq!(sig.unsafety(), hir::Unsafety::Normal);
2188 self.mk_fn_ptr(sig.map_bound(|sig| ty::FnSig { unsafety: hir::Unsafety::Unsafe, ..sig }))
2191 /// Given the def_id of a Trait `trait_def_id` and the name of an associated item `assoc_name`
2192 /// returns true if the `trait_def_id` defines an associated item of name `assoc_name`.
2193 pub fn trait_may_define_assoc_type(self, trait_def_id: DefId, assoc_name: Ident) -> bool {
2194 self.super_traits_of(trait_def_id).any(|trait_did| {
2195 self.associated_items(trait_did)
2196 .find_by_name_and_kind(self, assoc_name, ty::AssocKind::Type, trait_did)
2201 /// Computes the def-ids of the transitive supertraits of `trait_def_id`. This (intentionally)
2202 /// does not compute the full elaborated super-predicates but just the set of def-ids. It is used
2203 /// to identify which traits may define a given associated type to help avoid cycle errors.
2204 /// Returns a `DefId` iterator.
2205 fn super_traits_of(self, trait_def_id: DefId) -> impl Iterator<Item = DefId> + 'tcx {
2206 let mut set = FxHashSet::default();
2207 let mut stack = vec![trait_def_id];
2209 set.insert(trait_def_id);
2211 iter::from_fn(move || -> Option<DefId> {
2212 let trait_did = stack.pop()?;
2213 let generic_predicates = self.super_predicates_of(trait_did);
2215 for (predicate, _) in generic_predicates.predicates {
2216 if let ty::PredicateKind::Trait(data) = predicate.kind().skip_binder() {
2217 if set.insert(data.def_id()) {
2218 stack.push(data.def_id());
2227 /// Given a closure signature, returns an equivalent fn signature. Detuples
2228 /// and so forth -- so e.g., if we have a sig with `Fn<(u32, i32)>` then
2229 /// you would get a `fn(u32, i32)`.
2230 /// `unsafety` determines the unsafety of the fn signature. If you pass
2231 /// `hir::Unsafety::Unsafe` in the previous example, then you would get
2232 /// an `unsafe fn (u32, i32)`.
2233 /// It cannot convert a closure that requires unsafe.
2234 pub fn signature_unclosure(
2236 sig: PolyFnSig<'tcx>,
2237 unsafety: hir::Unsafety,
2238 ) -> PolyFnSig<'tcx> {
2240 let params_iter = match s.inputs()[0].kind() {
2241 ty::Tuple(params) => params.into_iter(),
2244 self.mk_fn_sig(params_iter, s.output(), s.c_variadic, unsafety, abi::Abi::Rust)
2248 /// Same a `self.mk_region(kind)`, but avoids accessing the interners if
2251 pub fn reuse_or_mk_region(self, r: Region<'tcx>, kind: RegionKind) -> Region<'tcx> {
2252 if *r == kind { r } else { self.mk_region(kind) }
2255 #[allow(rustc::usage_of_ty_tykind)]
2257 pub fn mk_ty(self, st: TyKind<'tcx>) -> Ty<'tcx> {
2258 self.interners.intern_ty(st, self.sess, &self.gcx.untracked_resolutions)
2262 pub fn mk_predicate(self, binder: Binder<'tcx, PredicateKind<'tcx>>) -> Predicate<'tcx> {
2263 self.interners.intern_predicate(binder)
2267 pub fn reuse_or_mk_predicate(
2269 pred: Predicate<'tcx>,
2270 binder: Binder<'tcx, PredicateKind<'tcx>>,
2271 ) -> Predicate<'tcx> {
2272 if pred.kind() != binder { self.mk_predicate(binder) } else { pred }
2275 pub fn mk_mach_int(self, tm: IntTy) -> Ty<'tcx> {
2277 IntTy::Isize => self.types.isize,
2278 IntTy::I8 => self.types.i8,
2279 IntTy::I16 => self.types.i16,
2280 IntTy::I32 => self.types.i32,
2281 IntTy::I64 => self.types.i64,
2282 IntTy::I128 => self.types.i128,
2286 pub fn mk_mach_uint(self, tm: UintTy) -> Ty<'tcx> {
2288 UintTy::Usize => self.types.usize,
2289 UintTy::U8 => self.types.u8,
2290 UintTy::U16 => self.types.u16,
2291 UintTy::U32 => self.types.u32,
2292 UintTy::U64 => self.types.u64,
2293 UintTy::U128 => self.types.u128,
2297 pub fn mk_mach_float(self, tm: FloatTy) -> Ty<'tcx> {
2299 FloatTy::F32 => self.types.f32,
2300 FloatTy::F64 => self.types.f64,
2305 pub fn mk_static_str(self) -> Ty<'tcx> {
2306 self.mk_imm_ref(self.lifetimes.re_static, self.types.str_)
2310 pub fn mk_adt(self, def: AdtDef<'tcx>, substs: SubstsRef<'tcx>) -> Ty<'tcx> {
2311 // Take a copy of substs so that we own the vectors inside.
2312 self.mk_ty(Adt(def, substs))
2316 pub fn mk_foreign(self, def_id: DefId) -> Ty<'tcx> {
2317 self.mk_ty(Foreign(def_id))
2320 fn mk_generic_adt(self, wrapper_def_id: DefId, ty_param: Ty<'tcx>) -> Ty<'tcx> {
2321 let adt_def = self.adt_def(wrapper_def_id);
2323 InternalSubsts::for_item(self, wrapper_def_id, |param, substs| match param.kind {
2324 GenericParamDefKind::Lifetime | GenericParamDefKind::Const { .. } => bug!(),
2325 GenericParamDefKind::Type { has_default, .. } => {
2326 if param.index == 0 {
2329 assert!(has_default);
2330 self.type_of(param.def_id).subst(self, substs).into()
2334 self.mk_ty(Adt(adt_def, substs))
2338 pub fn mk_box(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2339 let def_id = self.require_lang_item(LangItem::OwnedBox, None);
2340 self.mk_generic_adt(def_id, ty)
2344 pub fn mk_lang_item(self, ty: Ty<'tcx>, item: LangItem) -> Option<Ty<'tcx>> {
2345 let def_id = self.lang_items().require(item).ok()?;
2346 Some(self.mk_generic_adt(def_id, ty))
2350 pub fn mk_diagnostic_item(self, ty: Ty<'tcx>, name: Symbol) -> Option<Ty<'tcx>> {
2351 let def_id = self.get_diagnostic_item(name)?;
2352 Some(self.mk_generic_adt(def_id, ty))
2356 pub fn mk_maybe_uninit(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2357 let def_id = self.require_lang_item(LangItem::MaybeUninit, None);
2358 self.mk_generic_adt(def_id, ty)
2362 pub fn mk_ptr(self, tm: TypeAndMut<'tcx>) -> Ty<'tcx> {
2363 self.mk_ty(RawPtr(tm))
2367 pub fn mk_ref(self, r: Region<'tcx>, tm: TypeAndMut<'tcx>) -> Ty<'tcx> {
2368 self.mk_ty(Ref(r, tm.ty, tm.mutbl))
2372 pub fn mk_mut_ref(self, r: Region<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
2373 self.mk_ref(r, TypeAndMut { ty, mutbl: hir::Mutability::Mut })
2377 pub fn mk_imm_ref(self, r: Region<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
2378 self.mk_ref(r, TypeAndMut { ty, mutbl: hir::Mutability::Not })
2382 pub fn mk_mut_ptr(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2383 self.mk_ptr(TypeAndMut { ty, mutbl: hir::Mutability::Mut })
2387 pub fn mk_imm_ptr(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2388 self.mk_ptr(TypeAndMut { ty, mutbl: hir::Mutability::Not })
2392 pub fn mk_array(self, ty: Ty<'tcx>, n: u64) -> Ty<'tcx> {
2393 self.mk_ty(Array(ty, ty::Const::from_usize(self, n)))
2397 pub fn mk_slice(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2398 self.mk_ty(Slice(ty))
2402 pub fn intern_tup(self, ts: &[Ty<'tcx>]) -> Ty<'tcx> {
2403 self.mk_ty(Tuple(self.intern_type_list(&ts)))
2406 pub fn mk_tup<I: InternAs<[Ty<'tcx>], Ty<'tcx>>>(self, iter: I) -> I::Output {
2407 iter.intern_with(|ts| self.mk_ty(Tuple(self.intern_type_list(&ts))))
2411 pub fn mk_unit(self) -> Ty<'tcx> {
2416 pub fn mk_diverging_default(self) -> Ty<'tcx> {
2417 if self.features().never_type_fallback { self.types.never } else { self.types.unit }
2421 pub fn mk_fn_def(self, def_id: DefId, substs: SubstsRef<'tcx>) -> Ty<'tcx> {
2422 self.mk_ty(FnDef(def_id, substs))
2426 pub fn mk_fn_ptr(self, fty: PolyFnSig<'tcx>) -> Ty<'tcx> {
2427 self.mk_ty(FnPtr(fty))
2433 obj: &'tcx List<ty::Binder<'tcx, ExistentialPredicate<'tcx>>>,
2434 reg: ty::Region<'tcx>,
2436 self.mk_ty(Dynamic(obj, reg))
2440 pub fn mk_projection(self, item_def_id: DefId, substs: SubstsRef<'tcx>) -> Ty<'tcx> {
2441 self.mk_ty(Projection(ProjectionTy { item_def_id, substs }))
2445 pub fn mk_closure(self, closure_id: DefId, closure_substs: SubstsRef<'tcx>) -> Ty<'tcx> {
2446 self.mk_ty(Closure(closure_id, closure_substs))
2450 pub fn mk_generator(
2453 generator_substs: SubstsRef<'tcx>,
2454 movability: hir::Movability,
2456 self.mk_ty(Generator(id, generator_substs, movability))
2460 pub fn mk_generator_witness(self, types: ty::Binder<'tcx, &'tcx List<Ty<'tcx>>>) -> Ty<'tcx> {
2461 self.mk_ty(GeneratorWitness(types))
2465 pub fn mk_ty_var(self, v: TyVid) -> Ty<'tcx> {
2466 self.mk_ty_infer(TyVar(v))
2470 pub fn mk_const_var(self, v: ConstVid<'tcx>, ty: Ty<'tcx>) -> Const<'tcx> {
2471 self.mk_const(ty::ConstS { val: ty::ConstKind::Infer(InferConst::Var(v)), ty })
2475 pub fn mk_int_var(self, v: IntVid) -> Ty<'tcx> {
2476 self.mk_ty_infer(IntVar(v))
2480 pub fn mk_float_var(self, v: FloatVid) -> Ty<'tcx> {
2481 self.mk_ty_infer(FloatVar(v))
2485 pub fn mk_ty_infer(self, it: InferTy) -> Ty<'tcx> {
2486 self.mk_ty(Infer(it))
2490 pub fn mk_const_infer(self, ic: InferConst<'tcx>, ty: Ty<'tcx>) -> ty::Const<'tcx> {
2491 self.mk_const(ty::ConstS { val: ty::ConstKind::Infer(ic), ty })
2495 pub fn mk_ty_param(self, index: u32, name: Symbol) -> Ty<'tcx> {
2496 self.mk_ty(Param(ParamTy { index, name }))
2500 pub fn mk_const_param(self, index: u32, name: Symbol, ty: Ty<'tcx>) -> Const<'tcx> {
2501 self.mk_const(ty::ConstS { val: ty::ConstKind::Param(ParamConst { index, name }), ty })
2504 pub fn mk_param_from_def(self, param: &ty::GenericParamDef) -> GenericArg<'tcx> {
2506 GenericParamDefKind::Lifetime => {
2507 self.mk_region(ty::ReEarlyBound(param.to_early_bound_region_data())).into()
2509 GenericParamDefKind::Type { .. } => self.mk_ty_param(param.index, param.name).into(),
2510 GenericParamDefKind::Const { .. } => {
2511 self.mk_const_param(param.index, param.name, self.type_of(param.def_id)).into()
2517 pub fn mk_opaque(self, def_id: DefId, substs: SubstsRef<'tcx>) -> Ty<'tcx> {
2518 self.mk_ty(Opaque(def_id, substs))
2521 pub fn mk_place_field(self, place: Place<'tcx>, f: Field, ty: Ty<'tcx>) -> Place<'tcx> {
2522 self.mk_place_elem(place, PlaceElem::Field(f, ty))
2525 pub fn mk_place_deref(self, place: Place<'tcx>) -> Place<'tcx> {
2526 self.mk_place_elem(place, PlaceElem::Deref)
2529 pub fn mk_place_downcast(
2532 adt_def: AdtDef<'tcx>,
2533 variant_index: VariantIdx,
2537 PlaceElem::Downcast(Some(adt_def.variant(variant_index).name), variant_index),
2541 pub fn mk_place_downcast_unnamed(
2544 variant_index: VariantIdx,
2546 self.mk_place_elem(place, PlaceElem::Downcast(None, variant_index))
2549 pub fn mk_place_index(self, place: Place<'tcx>, index: Local) -> Place<'tcx> {
2550 self.mk_place_elem(place, PlaceElem::Index(index))
2553 /// This method copies `Place`'s projection, add an element and reintern it. Should not be used
2554 /// to build a full `Place` it's just a convenient way to grab a projection and modify it in
2556 pub fn mk_place_elem(self, place: Place<'tcx>, elem: PlaceElem<'tcx>) -> Place<'tcx> {
2557 let mut projection = place.projection.to_vec();
2558 projection.push(elem);
2560 Place { local: place.local, projection: self.intern_place_elems(&projection) }
2563 pub fn intern_poly_existential_predicates(
2565 eps: &[ty::Binder<'tcx, ExistentialPredicate<'tcx>>],
2566 ) -> &'tcx List<ty::Binder<'tcx, ExistentialPredicate<'tcx>>> {
2567 assert!(!eps.is_empty());
2570 .all(|[a, b]| a.skip_binder().stable_cmp(self, &b.skip_binder())
2571 != Ordering::Greater)
2573 self._intern_poly_existential_predicates(eps)
2576 pub fn intern_predicates(self, preds: &[Predicate<'tcx>]) -> &'tcx List<Predicate<'tcx>> {
2577 // FIXME consider asking the input slice to be sorted to avoid
2578 // re-interning permutations, in which case that would be asserted
2580 if preds.is_empty() {
2581 // The macro-generated method below asserts we don't intern an empty slice.
2584 self._intern_predicates(preds)
2588 pub fn intern_type_list(self, ts: &[Ty<'tcx>]) -> &'tcx List<Ty<'tcx>> {
2592 // Actually intern type lists as lists of `GenericArg`s.
2594 // Transmuting from `Ty<'tcx>` to `GenericArg<'tcx>` is sound
2595 // as explained in ty_slice_as_generic_arg`. With this,
2596 // we guarantee that even when transmuting between `List<Ty<'tcx>>`
2597 // and `List<GenericArg<'tcx>>`, the uniqueness requirement for
2599 let substs = self._intern_substs(ty::subst::ty_slice_as_generic_args(ts));
2600 substs.try_as_type_list().unwrap()
2604 pub fn intern_substs(self, ts: &[GenericArg<'tcx>]) -> &'tcx List<GenericArg<'tcx>> {
2605 if ts.is_empty() { List::empty() } else { self._intern_substs(ts) }
2608 pub fn intern_projs(self, ps: &[ProjectionKind]) -> &'tcx List<ProjectionKind> {
2609 if ps.is_empty() { List::empty() } else { self._intern_projs(ps) }
2612 pub fn intern_place_elems(self, ts: &[PlaceElem<'tcx>]) -> &'tcx List<PlaceElem<'tcx>> {
2613 if ts.is_empty() { List::empty() } else { self._intern_place_elems(ts) }
2616 pub fn intern_canonical_var_infos(
2618 ts: &[CanonicalVarInfo<'tcx>],
2619 ) -> CanonicalVarInfos<'tcx> {
2620 if ts.is_empty() { List::empty() } else { self._intern_canonical_var_infos(ts) }
2623 pub fn intern_bound_variable_kinds(
2625 ts: &[ty::BoundVariableKind],
2626 ) -> &'tcx List<ty::BoundVariableKind> {
2627 if ts.is_empty() { List::empty() } else { self._intern_bound_variable_kinds(ts) }
2630 pub fn mk_fn_sig<I>(
2635 unsafety: hir::Unsafety,
2637 ) -> <I::Item as InternIteratorElement<Ty<'tcx>, ty::FnSig<'tcx>>>::Output
2639 I: Iterator<Item: InternIteratorElement<Ty<'tcx>, ty::FnSig<'tcx>>>,
2641 inputs.chain(iter::once(output)).intern_with(|xs| ty::FnSig {
2642 inputs_and_output: self.intern_type_list(xs),
2649 pub fn mk_poly_existential_predicates<
2651 [ty::Binder<'tcx, ExistentialPredicate<'tcx>>],
2652 &'tcx List<ty::Binder<'tcx, ExistentialPredicate<'tcx>>>,
2658 iter.intern_with(|xs| self.intern_poly_existential_predicates(xs))
2661 pub fn mk_predicates<I: InternAs<[Predicate<'tcx>], &'tcx List<Predicate<'tcx>>>>(
2665 iter.intern_with(|xs| self.intern_predicates(xs))
2668 pub fn mk_type_list<I: InternAs<[Ty<'tcx>], &'tcx List<Ty<'tcx>>>>(self, iter: I) -> I::Output {
2669 iter.intern_with(|xs| self.intern_type_list(xs))
2672 pub fn mk_substs<I: InternAs<[GenericArg<'tcx>], &'tcx List<GenericArg<'tcx>>>>(
2676 iter.intern_with(|xs| self.intern_substs(xs))
2679 pub fn mk_place_elems<I: InternAs<[PlaceElem<'tcx>], &'tcx List<PlaceElem<'tcx>>>>(
2683 iter.intern_with(|xs| self.intern_place_elems(xs))
2686 pub fn mk_substs_trait(self, self_ty: Ty<'tcx>, rest: &[GenericArg<'tcx>]) -> SubstsRef<'tcx> {
2687 self.mk_substs(iter::once(self_ty.into()).chain(rest.iter().cloned()))
2690 pub fn mk_bound_variable_kinds<
2691 I: InternAs<[ty::BoundVariableKind], &'tcx List<ty::BoundVariableKind>>,
2696 iter.intern_with(|xs| self.intern_bound_variable_kinds(xs))
2699 /// Walks upwards from `id` to find a node which might change lint levels with attributes.
2700 /// It stops at `bound` and just returns it if reached.
2701 pub fn maybe_lint_level_root_bounded(self, mut id: HirId, bound: HirId) -> HirId {
2702 let hir = self.hir();
2708 if hir.attrs(id).iter().any(|attr| Level::from_attr(attr).is_some()) {
2711 let next = hir.get_parent_node(id);
2713 bug!("lint traversal reached the root of the crate");
2719 pub fn lint_level_at_node(
2721 lint: &'static Lint,
2723 ) -> (Level, LintLevelSource) {
2724 let sets = self.lint_levels(());
2726 if let Some(pair) = sets.level_and_source(lint, id, self.sess) {
2729 let next = self.hir().get_parent_node(id);
2731 bug!("lint traversal reached the root of the crate");
2737 pub fn struct_span_lint_hir(
2739 lint: &'static Lint,
2741 span: impl Into<MultiSpan>,
2742 decorate: impl for<'a> FnOnce(LintDiagnosticBuilder<'a, ()>),
2744 let (level, src) = self.lint_level_at_node(lint, hir_id);
2745 struct_lint_level(self.sess, lint, level, src, Some(span.into()), decorate);
2748 pub fn struct_lint_node(
2750 lint: &'static Lint,
2752 decorate: impl for<'a> FnOnce(LintDiagnosticBuilder<'a, ()>),
2754 let (level, src) = self.lint_level_at_node(lint, id);
2755 struct_lint_level(self.sess, lint, level, src, None, decorate);
2758 pub fn in_scope_traits(self, id: HirId) -> Option<&'tcx [TraitCandidate]> {
2759 let map = self.in_scope_traits_map(id.owner)?;
2760 let candidates = map.get(&id.local_id)?;
2764 pub fn named_region(self, id: HirId) -> Option<resolve_lifetime::Region> {
2765 debug!(?id, "named_region");
2766 self.named_region_map(id.owner).and_then(|map| map.get(&id.local_id).cloned())
2769 pub fn is_late_bound(self, id: HirId) -> bool {
2770 self.is_late_bound_map(id.owner)
2771 .map_or(false, |(owner, set)| owner == id.owner && set.contains(&id.local_id))
2774 pub fn late_bound_vars(self, id: HirId) -> &'tcx List<ty::BoundVariableKind> {
2775 self.mk_bound_variable_kinds(
2776 self.late_bound_vars_map(id.owner)
2777 .and_then(|map| map.get(&id.local_id).cloned())
2778 .unwrap_or_else(|| {
2779 bug!("No bound vars found for {:?} ({:?})", self.hir().node_to_string(id), id)
2785 pub fn lifetime_scope(self, id: HirId) -> Option<&'tcx LifetimeScopeForPath> {
2786 self.lifetime_scope_map(id.owner).as_ref().and_then(|map| map.get(&id.local_id))
2789 /// Whether the `def_id` counts as const fn in the current crate, considering all active
2791 pub fn is_const_fn(self, def_id: DefId) -> bool {
2792 if self.is_const_fn_raw(def_id) {
2793 match self.lookup_const_stability(def_id) {
2794 Some(stability) if stability.level.is_unstable() => {
2795 // has a `rustc_const_unstable` attribute, check whether the user enabled the
2796 // corresponding feature gate.
2798 .declared_lib_features
2800 .any(|&(sym, _)| sym == stability.feature)
2802 // functions without const stability are either stable user written
2803 // const fn or the user is using feature gates and we thus don't
2804 // care what they do
2813 impl<'tcx> TyCtxtAt<'tcx> {
2814 /// Constructs a `TyKind::Error` type and registers a `delay_span_bug` to ensure it gets used.
2816 pub fn ty_error(self) -> Ty<'tcx> {
2817 self.tcx.ty_error_with_message(self.span, "TyKind::Error constructed but no error reported")
2820 /// Constructs a `TyKind::Error` type and registers a `delay_span_bug` with the given `msg to
2821 /// ensure it gets used.
2823 pub fn ty_error_with_message(self, msg: &str) -> Ty<'tcx> {
2824 self.tcx.ty_error_with_message(self.span, msg)
2828 pub trait InternAs<T: ?Sized, R> {
2830 fn intern_with<F>(self, f: F) -> Self::Output
2835 impl<I, T, R, E> InternAs<[T], R> for I
2837 E: InternIteratorElement<T, R>,
2838 I: Iterator<Item = E>,
2840 type Output = E::Output;
2841 fn intern_with<F>(self, f: F) -> Self::Output
2843 F: FnOnce(&[T]) -> R,
2845 E::intern_with(self, f)
2849 pub trait InternIteratorElement<T, R>: Sized {
2851 fn intern_with<I: Iterator<Item = Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output;
2854 impl<T, R> InternIteratorElement<T, R> for T {
2856 fn intern_with<I: Iterator<Item = Self>, F: FnOnce(&[T]) -> R>(
2860 // This code is hot enough that it's worth specializing for the most
2861 // common length lists, to avoid the overhead of `SmallVec` creation.
2862 // Lengths 0, 1, and 2 typically account for ~95% of cases. If
2863 // `size_hint` is incorrect a panic will occur via an `unwrap` or an
2865 match iter.size_hint() {
2867 assert!(iter.next().is_none());
2871 let t0 = iter.next().unwrap();
2872 assert!(iter.next().is_none());
2876 let t0 = iter.next().unwrap();
2877 let t1 = iter.next().unwrap();
2878 assert!(iter.next().is_none());
2881 _ => f(&iter.collect::<SmallVec<[_; 8]>>()),
2886 impl<'a, T, R> InternIteratorElement<T, R> for &'a T
2891 fn intern_with<I: Iterator<Item = Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output {
2892 // This code isn't hot.
2893 f(&iter.cloned().collect::<SmallVec<[_; 8]>>())
2897 impl<T, R, E> InternIteratorElement<T, R> for Result<T, E> {
2898 type Output = Result<R, E>;
2899 fn intern_with<I: Iterator<Item = Self>, F: FnOnce(&[T]) -> R>(
2903 // This code is hot enough that it's worth specializing for the most
2904 // common length lists, to avoid the overhead of `SmallVec` creation.
2905 // Lengths 0, 1, and 2 typically account for ~95% of cases. If
2906 // `size_hint` is incorrect a panic will occur via an `unwrap` or an
2907 // `assert`, unless a failure happens first, in which case the result
2908 // will be an error anyway.
2909 Ok(match iter.size_hint() {
2911 assert!(iter.next().is_none());
2915 let t0 = iter.next().unwrap()?;
2916 assert!(iter.next().is_none());
2920 let t0 = iter.next().unwrap()?;
2921 let t1 = iter.next().unwrap()?;
2922 assert!(iter.next().is_none());
2925 _ => f(&iter.collect::<Result<SmallVec<[_; 8]>, _>>()?),
2930 // We are comparing types with different invariant lifetimes, so `ptr::eq`
2931 // won't work for us.
2932 fn ptr_eq<T, U>(t: *const T, u: *const U) -> bool {
2933 t as *const () == u as *const ()
2936 pub fn provide(providers: &mut ty::query::Providers) {
2937 providers.resolutions = |tcx, ()| &tcx.untracked_resolutions;
2938 providers.module_reexports =
2939 |tcx, id| tcx.resolutions(()).reexport_map.get(&id).map(|v| &v[..]);
2940 providers.crate_name = |tcx, id| {
2941 assert_eq!(id, LOCAL_CRATE);
2944 providers.maybe_unused_trait_import =
2945 |tcx, id| tcx.resolutions(()).maybe_unused_trait_imports.contains(&id);
2946 providers.maybe_unused_extern_crates =
2947 |tcx, ()| &tcx.resolutions(()).maybe_unused_extern_crates[..];
2948 providers.names_imported_by_glob_use = |tcx, id| {
2949 tcx.arena.alloc(tcx.resolutions(()).glob_map.get(&id).cloned().unwrap_or_default())
2952 providers.extern_mod_stmt_cnum =
2953 |tcx, id| tcx.resolutions(()).extern_crate_map.get(&id).cloned();
2954 providers.output_filenames = |tcx, ()| &tcx.output_filenames;
2955 providers.features_query = |tcx, ()| tcx.sess.features_untracked();
2956 providers.is_panic_runtime = |tcx, cnum| {
2957 assert_eq!(cnum, LOCAL_CRATE);
2958 tcx.sess.contains_name(tcx.hir().krate_attrs(), sym::panic_runtime)
2960 providers.is_compiler_builtins = |tcx, cnum| {
2961 assert_eq!(cnum, LOCAL_CRATE);
2962 tcx.sess.contains_name(tcx.hir().krate_attrs(), sym::compiler_builtins)
2964 providers.has_panic_handler = |tcx, cnum| {
2965 assert_eq!(cnum, LOCAL_CRATE);
2966 // We want to check if the panic handler was defined in this crate
2967 tcx.lang_items().panic_impl().map_or(false, |did| did.is_local())