1 // Each of these queries corresponds to a function pointer field in the
2 // `Providers` struct for requesting a value of that type, and a method
3 // on `tcx: TyCtxt` (and `tcx.at(span)`) for doing that request in a way
4 // which memoizes and does dep-graph tracking, wrapping around the actual
5 // `Providers` that the driver creates (using several `rustc_*` crates).
7 // The result type of each query must implement `Clone`, and additionally
8 // `ty::query::values::Value`, which produces an appropriate placeholder
9 // (error) value if the query resulted in a query cycle.
10 // Queries marked with `fatal_cycle` do not need the latter implementation,
11 // as they will raise an fatal error on query cycles instead.
13 query trigger_delay_span_bug(key: DefId) -> () {
14 desc { "trigger a delay span bug" }
17 query resolutions(_: ()) -> &'tcx ty::ResolverOutputs {
20 desc { "get the resolver outputs" }
23 /// Return the span for a definition.
24 /// Contrary to `def_span` below, this query returns the full absolute span of the definition.
25 /// This span is meant for dep-tracking rather than diagnostics. It should not be used outside
26 /// of rustc_middle::hir::source_map.
27 query source_span(key: LocalDefId) -> Span {
28 desc { "get the source span" }
31 /// Represents crate as a whole (as distinct from the top-level crate module).
32 /// If you call `hir_crate` (e.g., indirectly by calling `tcx.hir().krate()`),
33 /// we will have to assume that any change means that you need to be recompiled.
34 /// This is because the `hir_crate` query gives you access to all other items.
35 /// To avoid this fate, do not call `tcx.hir().krate()`; instead,
36 /// prefer wrappers like `tcx.visit_all_items_in_krate()`.
37 query hir_crate(key: ()) -> &'tcx Crate<'tcx> {
40 desc { "get the crate HIR" }
43 /// The indexed HIR. This can be conveniently accessed by `tcx.hir()`.
44 /// Avoid calling this query directly.
45 query index_hir(_: ()) -> &'tcx crate::hir::IndexedHir<'tcx> {
51 /// The items in a module.
53 /// This can be conveniently accessed by `tcx.hir().visit_item_likes_in_module`.
54 /// Avoid calling this query directly.
55 query hir_module_items(key: LocalDefId) -> rustc_middle::hir::ModuleItems {
56 storage(ArenaCacheSelector<'tcx>)
57 desc { |tcx| "HIR module items in `{}`", tcx.def_path_str(key.to_def_id()) }
60 /// Gives access to the HIR node for the HIR owner `key`.
62 /// This can be conveniently accessed by methods on `tcx.hir()`.
63 /// Avoid calling this query directly.
64 query hir_owner(key: LocalDefId) -> Option<crate::hir::Owner<'tcx>> {
66 desc { |tcx| "HIR owner of `{}`", tcx.def_path_str(key.to_def_id()) }
69 /// Gives access to the HIR node's parent for the HIR owner `key`.
71 /// This can be conveniently accessed by methods on `tcx.hir()`.
72 /// Avoid calling this query directly.
73 query hir_owner_parent(key: LocalDefId) -> hir::HirId {
75 desc { |tcx| "HIR parent of `{}`", tcx.def_path_str(key.to_def_id()) }
78 /// Gives access to the HIR nodes and bodies inside the HIR owner `key`.
80 /// This can be conveniently accessed by methods on `tcx.hir()`.
81 /// Avoid calling this query directly.
82 query hir_owner_nodes(key: LocalDefId) -> Option<&'tcx crate::hir::OwnerNodes<'tcx>> {
84 desc { |tcx| "HIR owner items in `{}`", tcx.def_path_str(key.to_def_id()) }
87 /// Gives access to the HIR attributes inside the HIR owner `key`.
89 /// This can be conveniently accessed by methods on `tcx.hir()`.
90 /// Avoid calling this query directly.
91 query hir_attrs(key: LocalDefId) -> rustc_middle::hir::AttributeMap<'tcx> {
93 desc { |tcx| "HIR owner attributes in `{}`", tcx.def_path_str(key.to_def_id()) }
96 /// Computes the `DefId` of the corresponding const parameter in case the `key` is a
97 /// const argument and returns `None` otherwise.
99 /// ```ignore (incomplete)
100 /// let a = foo::<7>();
101 /// // ^ Calling `opt_const_param_of` for this argument,
103 /// fn foo<const N: usize>()
104 /// // ^ returns this `DefId`.
107 /// // ^ While calling `opt_const_param_of` for other bodies returns `None`.
110 // It looks like caching this query on disk actually slightly
111 // worsened performance in #74376.
113 // Once const generics are more prevalently used, we might want to
114 // consider only caching calls returning `Some`.
115 query opt_const_param_of(key: LocalDefId) -> Option<DefId> {
116 desc { |tcx| "computing the optional const parameter of `{}`", tcx.def_path_str(key.to_def_id()) }
119 /// Given the def_id of a const-generic parameter, computes the associated default const
120 /// parameter. e.g. `fn example<const N: usize=3>` called on `N` would return `3`.
121 query const_param_default(param: DefId) -> &'tcx ty::Const<'tcx> {
122 desc { |tcx| "compute const default for a given parameter `{}`", tcx.def_path_str(param) }
125 query default_anon_const_substs(key: DefId) -> SubstsRef<'tcx> {
126 desc { |tcx| "computing the default generic arguments for `{}`", tcx.def_path_str(key) }
129 /// Records the type of every item.
130 query type_of(key: DefId) -> Ty<'tcx> {
134 use rustc_hir::def::DefKind;
135 match tcx.def_kind(key) {
136 DefKind::TyAlias => "expanding type alias",
137 DefKind::TraitAlias => "expanding trait alias",
138 _ => "computing type of",
141 path = tcx.def_path_str(key),
143 cache_on_disk_if { key.is_local() }
146 query analysis(key: ()) -> Result<(), ErrorReported> {
148 desc { "running analysis passes on this crate" }
151 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to its
152 /// associated generics.
153 query generics_of(key: DefId) -> ty::Generics {
154 desc { |tcx| "computing generics of `{}`", tcx.def_path_str(key) }
155 storage(ArenaCacheSelector<'tcx>)
156 cache_on_disk_if { key.is_local() }
159 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
160 /// predicates (where-clauses) that must be proven true in order
161 /// to reference it. This is almost always the "predicates query"
164 /// `predicates_of` builds on `predicates_defined_on` -- in fact,
165 /// it is almost always the same as that query, except for the
166 /// case of traits. For traits, `predicates_of` contains
167 /// an additional `Self: Trait<...>` predicate that users don't
168 /// actually write. This reflects the fact that to invoke the
169 /// trait (e.g., via `Default::default`) you must supply types
170 /// that actually implement the trait. (However, this extra
171 /// predicate gets in the way of some checks, which are intended
172 /// to operate over only the actual where-clauses written by the
174 query predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
175 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
176 cache_on_disk_if { key.is_local() }
179 /// Returns the list of bounds that can be used for
180 /// `SelectionCandidate::ProjectionCandidate(_)` and
181 /// `ProjectionTyCandidate::TraitDef`.
182 /// Specifically this is the bounds written on the trait's type
183 /// definition, or those after the `impl` keyword
185 /// ```ignore (incomplete)
186 /// type X: Bound + 'lt
188 /// impl Debug + Display
189 /// // ^^^^^^^^^^^^^^^
192 /// `key` is the `DefId` of the associated type or opaque type.
194 /// Bounds from the parent (e.g. with nested impl trait) are not included.
195 query explicit_item_bounds(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
196 desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
199 /// Elaborated version of the predicates from `explicit_item_bounds`.
205 /// type MyAType: Eq + ?Sized;
209 /// `explicit_item_bounds` returns `[<Self as MyTrait>::MyAType: Eq]`,
210 /// and `item_bounds` returns
213 /// <Self as Trait>::MyAType: Eq,
214 /// <Self as Trait>::MyAType: PartialEq<<Self as Trait>::MyAType>
218 /// Bounds from the parent (e.g. with nested impl trait) are not included.
219 query item_bounds(key: DefId) -> &'tcx ty::List<ty::Predicate<'tcx>> {
220 desc { |tcx| "elaborating item bounds for `{}`", tcx.def_path_str(key) }
223 query native_libraries(_: CrateNum) -> Lrc<Vec<NativeLib>> {
224 desc { "looking up the native libraries of a linked crate" }
227 query lint_levels(_: ()) -> LintLevelMap {
228 storage(ArenaCacheSelector<'tcx>)
230 desc { "computing the lint levels for items in this crate" }
233 query parent_module_from_def_id(key: LocalDefId) -> LocalDefId {
235 desc { |tcx| "parent module of `{}`", tcx.def_path_str(key.to_def_id()) }
238 query expn_that_defined(key: DefId) -> rustc_span::ExpnId {
239 // This query reads from untracked data in definitions.
241 desc { |tcx| "expansion that defined `{}`", tcx.def_path_str(key) }
244 query is_panic_runtime(_: CrateNum) -> bool {
246 desc { "checking if the crate is_panic_runtime" }
249 /// Fetch the THIR for a given body. If typeck for that body failed, returns an empty `Thir`.
250 query thir_body(key: ty::WithOptConstParam<LocalDefId>) -> (&'tcx Steal<thir::Thir<'tcx>>, thir::ExprId) {
251 // Perf tests revealed that hashing THIR is inefficient (see #85729).
253 desc { |tcx| "building THIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
256 /// Create a THIR tree for debugging.
257 query thir_tree(key: ty::WithOptConstParam<LocalDefId>) -> String {
259 desc { |tcx| "constructing THIR tree for `{}`", tcx.def_path_str(key.did.to_def_id()) }
262 /// Set of all the `DefId`s in this crate that have MIR associated with
263 /// them. This includes all the body owners, but also things like struct
265 query mir_keys(_: ()) -> FxHashSet<LocalDefId> {
266 storage(ArenaCacheSelector<'tcx>)
267 desc { "getting a list of all mir_keys" }
270 /// Maps DefId's that have an associated `mir::Body` to the result
271 /// of the MIR const-checking pass. This is the set of qualifs in
272 /// the final value of a `const`.
273 query mir_const_qualif(key: DefId) -> mir::ConstQualifs {
274 desc { |tcx| "const checking `{}`", tcx.def_path_str(key) }
275 cache_on_disk_if { key.is_local() }
277 query mir_const_qualif_const_arg(
278 key: (LocalDefId, DefId)
279 ) -> mir::ConstQualifs {
281 |tcx| "const checking the const argument `{}`",
282 tcx.def_path_str(key.0.to_def_id())
286 /// Fetch the MIR for a given `DefId` right after it's built - this includes
287 /// unreachable code.
288 query mir_built(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
289 desc { |tcx| "building MIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
292 /// Fetch the MIR for a given `DefId` up till the point where it is
293 /// ready for const qualification.
295 /// See the README for the `mir` module for details.
296 query mir_const(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
298 |tcx| "processing MIR for {}`{}`",
299 if key.const_param_did.is_some() { "the const argument " } else { "" },
300 tcx.def_path_str(key.did.to_def_id()),
305 /// Try to build an abstract representation of the given constant.
306 query thir_abstract_const(
308 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
310 |tcx| "building an abstract representation for {}", tcx.def_path_str(key),
313 /// Try to build an abstract representation of the given constant.
314 query thir_abstract_const_of_const_arg(
315 key: (LocalDefId, DefId)
316 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
319 "building an abstract representation for the const argument {}",
320 tcx.def_path_str(key.0.to_def_id()),
324 query try_unify_abstract_consts(key: (
325 ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
328 |tcx| "trying to unify the generic constants {} and {}",
329 tcx.def_path_str(key.0.def.did), tcx.def_path_str(key.1.def.did)
333 query mir_drops_elaborated_and_const_checked(
334 key: ty::WithOptConstParam<LocalDefId>
335 ) -> &'tcx Steal<mir::Body<'tcx>> {
337 desc { |tcx| "elaborating drops for `{}`", tcx.def_path_str(key.did.to_def_id()) }
342 ) -> &'tcx mir::Body<'tcx> {
343 desc { |tcx| "caching mir of `{}` for CTFE", tcx.def_path_str(key) }
344 cache_on_disk_if { key.is_local() }
347 query mir_for_ctfe_of_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::Body<'tcx> {
349 |tcx| "MIR for CTFE of the const argument `{}`",
350 tcx.def_path_str(key.0.to_def_id())
354 query mir_promoted(key: ty::WithOptConstParam<LocalDefId>) ->
356 &'tcx Steal<mir::Body<'tcx>>,
357 &'tcx Steal<IndexVec<mir::Promoted, mir::Body<'tcx>>>
361 |tcx| "processing {}`{}`",
362 if key.const_param_did.is_some() { "the const argument " } else { "" },
363 tcx.def_path_str(key.did.to_def_id()),
367 query symbols_for_closure_captures(
368 key: (LocalDefId, DefId)
369 ) -> Vec<rustc_span::Symbol> {
371 |tcx| "symbols for captures of closure `{}` in `{}`",
372 tcx.def_path_str(key.1),
373 tcx.def_path_str(key.0.to_def_id())
377 /// MIR after our optimization passes have run. This is MIR that is ready
378 /// for codegen. This is also the only query that can fetch non-local MIR, at present.
379 query optimized_mir(key: DefId) -> &'tcx mir::Body<'tcx> {
380 desc { |tcx| "optimizing MIR for `{}`", tcx.def_path_str(key) }
381 cache_on_disk_if { key.is_local() }
384 /// Returns coverage summary info for a function, after executing the `InstrumentCoverage`
385 /// MIR pass (assuming the -Zinstrument-coverage option is enabled).
386 query coverageinfo(key: ty::InstanceDef<'tcx>) -> mir::CoverageInfo {
387 desc { |tcx| "retrieving coverage info from MIR for `{}`", tcx.def_path_str(key.def_id()) }
388 storage(ArenaCacheSelector<'tcx>)
391 /// Returns the name of the file that contains the function body, if instrumented for coverage.
392 query covered_file_name(key: DefId) -> Option<Symbol> {
394 |tcx| "retrieving the covered file name, if instrumented, for `{}`",
395 tcx.def_path_str(key)
397 storage(ArenaCacheSelector<'tcx>)
398 cache_on_disk_if { key.is_local() }
401 /// Returns the `CodeRegions` for a function that has instrumented coverage, in case the
402 /// function was optimized out before codegen, and before being added to the Coverage Map.
403 query covered_code_regions(key: DefId) -> Vec<&'tcx mir::coverage::CodeRegion> {
405 |tcx| "retrieving the covered `CodeRegion`s, if instrumented, for `{}`",
406 tcx.def_path_str(key)
408 storage(ArenaCacheSelector<'tcx>)
409 cache_on_disk_if { key.is_local() }
412 /// The `DefId` is the `DefId` of the containing MIR body. Promoteds do not have their own
413 /// `DefId`. This function returns all promoteds in the specified body. The body references
414 /// promoteds by the `DefId` and the `mir::Promoted` index. This is necessary, because
415 /// after inlining a body may refer to promoteds from other bodies. In that case you still
416 /// need to use the `DefId` of the original body.
417 query promoted_mir(key: DefId) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
418 desc { |tcx| "optimizing promoted MIR for `{}`", tcx.def_path_str(key) }
419 cache_on_disk_if { key.is_local() }
421 query promoted_mir_of_const_arg(
422 key: (LocalDefId, DefId)
423 ) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
425 |tcx| "optimizing promoted MIR for the const argument `{}`",
426 tcx.def_path_str(key.0.to_def_id()),
430 /// Erases regions from `ty` to yield a new type.
431 /// Normally you would just use `tcx.erase_regions(value)`,
432 /// however, which uses this query as a kind of cache.
433 query erase_regions_ty(ty: Ty<'tcx>) -> Ty<'tcx> {
434 // This query is not expected to have input -- as a result, it
435 // is not a good candidates for "replay" because it is essentially a
436 // pure function of its input (and hence the expectation is that
437 // no caller would be green **apart** from just these
438 // queries). Making it anonymous avoids hashing the result, which
439 // may save a bit of time.
441 desc { "erasing regions from `{:?}`", ty }
444 query wasm_import_module_map(_: CrateNum) -> FxHashMap<DefId, String> {
445 storage(ArenaCacheSelector<'tcx>)
446 desc { "wasm import module map" }
449 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
450 /// predicates (where-clauses) directly defined on it. This is
451 /// equal to the `explicit_predicates_of` predicates plus the
452 /// `inferred_outlives_of` predicates.
453 query predicates_defined_on(key: DefId) -> ty::GenericPredicates<'tcx> {
454 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
457 /// Returns everything that looks like a predicate written explicitly
458 /// by the user on a trait item.
460 /// Traits are unusual, because predicates on associated types are
461 /// converted into bounds on that type for backwards compatibility:
463 /// trait X where Self::U: Copy { type U; }
467 /// trait X { type U: Copy; }
469 /// `explicit_predicates_of` and `explicit_item_bounds` will then take
470 /// the appropriate subsets of the predicates here.
471 query trait_explicit_predicates_and_bounds(key: LocalDefId) -> ty::GenericPredicates<'tcx> {
472 desc { |tcx| "computing explicit predicates of trait `{}`", tcx.def_path_str(key.to_def_id()) }
475 /// Returns the predicates written explicitly by the user.
476 query explicit_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
477 desc { |tcx| "computing explicit predicates of `{}`", tcx.def_path_str(key) }
480 /// Returns the inferred outlives predicates (e.g., for `struct
481 /// Foo<'a, T> { x: &'a T }`, this would return `T: 'a`).
482 query inferred_outlives_of(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
483 desc { |tcx| "computing inferred outlives predicates of `{}`", tcx.def_path_str(key) }
486 /// Maps from the `DefId` of a trait to the list of
487 /// super-predicates. This is a subset of the full list of
488 /// predicates. We store these in a separate map because we must
489 /// evaluate them even during type conversion, often before the
490 /// full predicates are available (note that supertraits have
491 /// additional acyclicity requirements).
492 query super_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
493 desc { |tcx| "computing the super predicates of `{}`", tcx.def_path_str(key) }
496 /// The `Option<Ident>` is the name of an associated type. If it is `None`, then this query
497 /// returns the full set of predicates. If `Some<Ident>`, then the query returns only the
498 /// subset of super-predicates that reference traits that define the given associated type.
499 /// This is used to avoid cycles in resolving types like `T::Item`.
500 query super_predicates_that_define_assoc_type(key: (DefId, Option<rustc_span::symbol::Ident>)) -> ty::GenericPredicates<'tcx> {
501 desc { |tcx| "computing the super traits of `{}`{}",
502 tcx.def_path_str(key.0),
503 if let Some(assoc_name) = key.1 { format!(" with associated type name `{}`", assoc_name) } else { "".to_string() },
507 /// To avoid cycles within the predicates of a single item we compute
508 /// per-type-parameter predicates for resolving `T::AssocTy`.
509 query type_param_predicates(key: (DefId, LocalDefId, rustc_span::symbol::Ident)) -> ty::GenericPredicates<'tcx> {
510 desc { |tcx| "computing the bounds for type parameter `{}`", {
511 let id = tcx.hir().local_def_id_to_hir_id(key.1);
512 tcx.hir().ty_param_name(id)
516 query trait_def(key: DefId) -> ty::TraitDef {
517 desc { |tcx| "computing trait definition for `{}`", tcx.def_path_str(key) }
518 storage(ArenaCacheSelector<'tcx>)
520 query adt_def(key: DefId) -> &'tcx ty::AdtDef {
521 desc { |tcx| "computing ADT definition for `{}`", tcx.def_path_str(key) }
523 query adt_destructor(key: DefId) -> Option<ty::Destructor> {
524 desc { |tcx| "computing `Drop` impl for `{}`", tcx.def_path_str(key) }
527 // The cycle error here should be reported as an error by `check_representable`.
528 // We consider the type as Sized in the meanwhile to avoid
529 // further errors (done in impl Value for AdtSizedConstraint).
530 // Use `cycle_delay_bug` to delay the cycle error here to be emitted later
531 // in case we accidentally otherwise don't emit an error.
532 query adt_sized_constraint(
534 ) -> AdtSizedConstraint<'tcx> {
535 desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
539 query adt_dtorck_constraint(
541 ) -> Result<DtorckConstraint<'tcx>, NoSolution> {
542 desc { |tcx| "computing drop-check constraints for `{}`", tcx.def_path_str(key) }
545 /// Returns `true` if this is a const fn, use the `is_const_fn` to know whether your crate
546 /// actually sees it as const fn (e.g., the const-fn-ness might be unstable and you might
547 /// not have the feature gate active).
549 /// **Do not call this function manually.** It is only meant to cache the base data for the
550 /// `is_const_fn` function.
551 query is_const_fn_raw(key: DefId) -> bool {
552 desc { |tcx| "checking if item is const fn: `{}`", tcx.def_path_str(key) }
555 query asyncness(key: DefId) -> hir::IsAsync {
556 desc { |tcx| "checking if the function is async: `{}`", tcx.def_path_str(key) }
559 /// Returns `true` if calls to the function may be promoted.
561 /// This is either because the function is e.g., a tuple-struct or tuple-variant
562 /// constructor, or because it has the `#[rustc_promotable]` attribute. The attribute should
563 /// be removed in the future in favour of some form of check which figures out whether the
564 /// function does not inspect the bits of any of its arguments (so is essentially just a
565 /// constructor function).
566 query is_promotable_const_fn(key: DefId) -> bool {
567 desc { |tcx| "checking if item is promotable: `{}`", tcx.def_path_str(key) }
570 /// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
571 query is_foreign_item(key: DefId) -> bool {
572 desc { |tcx| "checking if `{}` is a foreign item", tcx.def_path_str(key) }
575 /// Returns `Some(mutability)` if the node pointed to by `def_id` is a static item.
576 query static_mutability(def_id: DefId) -> Option<hir::Mutability> {
577 desc { |tcx| "looking up static mutability of `{}`", tcx.def_path_str(def_id) }
580 /// Returns `Some(generator_kind)` if the node pointed to by `def_id` is a generator.
581 query generator_kind(def_id: DefId) -> Option<hir::GeneratorKind> {
582 desc { |tcx| "looking up generator kind of `{}`", tcx.def_path_str(def_id) }
585 /// Gets a map with the variance of every item; use `item_variance` instead.
586 query crate_variances(_: ()) -> ty::CrateVariancesMap<'tcx> {
587 storage(ArenaCacheSelector<'tcx>)
588 desc { "computing the variances for items in this crate" }
591 /// Maps from the `DefId` of a type or region parameter to its (inferred) variance.
592 query variances_of(def_id: DefId) -> &'tcx [ty::Variance] {
593 desc { |tcx| "computing the variances of `{}`", tcx.def_path_str(def_id) }
596 /// Maps from thee `DefId` of a type to its (inferred) outlives.
597 query inferred_outlives_crate(_: ()) -> ty::CratePredicatesMap<'tcx> {
598 storage(ArenaCacheSelector<'tcx>)
599 desc { "computing the inferred outlives predicates for items in this crate" }
602 /// Maps from an impl/trait `DefId` to a list of the `DefId`s of its items.
603 query associated_item_def_ids(key: DefId) -> &'tcx [DefId] {
604 desc { |tcx| "collecting associated items of `{}`", tcx.def_path_str(key) }
607 /// Maps from a trait item to the trait item "descriptor".
608 query associated_item(key: DefId) -> ty::AssocItem {
609 desc { |tcx| "computing associated item data for `{}`", tcx.def_path_str(key) }
610 storage(ArenaCacheSelector<'tcx>)
613 /// Collects the associated items defined on a trait or impl.
614 query associated_items(key: DefId) -> ty::AssocItems<'tcx> {
615 storage(ArenaCacheSelector<'tcx>)
616 desc { |tcx| "collecting associated items of {}", tcx.def_path_str(key) }
619 /// Given an `impl_id`, return the trait it implements.
620 /// Return `None` if this is an inherent impl.
621 query impl_trait_ref(impl_id: DefId) -> Option<ty::TraitRef<'tcx>> {
622 desc { |tcx| "computing trait implemented by `{}`", tcx.def_path_str(impl_id) }
624 query impl_polarity(impl_id: DefId) -> ty::ImplPolarity {
625 desc { |tcx| "computing implementation polarity of `{}`", tcx.def_path_str(impl_id) }
628 query issue33140_self_ty(key: DefId) -> Option<ty::Ty<'tcx>> {
629 desc { |tcx| "computing Self type wrt issue #33140 `{}`", tcx.def_path_str(key) }
632 /// Maps a `DefId` of a type to a list of its inherent impls.
633 /// Contains implementations of methods that are inherent to a type.
634 /// Methods in these implementations don't need to be exported.
635 query inherent_impls(key: DefId) -> &'tcx [DefId] {
636 desc { |tcx| "collecting inherent impls for `{}`", tcx.def_path_str(key) }
640 /// The result of unsafety-checking this `LocalDefId`.
641 query unsafety_check_result(key: LocalDefId) -> &'tcx mir::UnsafetyCheckResult {
642 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
643 cache_on_disk_if { true }
645 query unsafety_check_result_for_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::UnsafetyCheckResult {
647 |tcx| "unsafety-checking the const argument `{}`",
648 tcx.def_path_str(key.0.to_def_id())
652 /// Unsafety-check this `LocalDefId` with THIR unsafeck. This should be
653 /// used with `-Zthir-unsafeck`.
654 query thir_check_unsafety(key: LocalDefId) {
655 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
656 cache_on_disk_if { true }
658 query thir_check_unsafety_for_const_arg(key: (LocalDefId, DefId)) {
660 |tcx| "unsafety-checking the const argument `{}`",
661 tcx.def_path_str(key.0.to_def_id())
665 /// HACK: when evaluated, this reports an "unsafe derive on repr(packed)" error.
667 /// Unsafety checking is executed for each method separately, but we only want
668 /// to emit this error once per derive. As there are some impls with multiple
669 /// methods, we use a query for deduplication.
670 query unsafe_derive_on_repr_packed(key: LocalDefId) -> () {
671 desc { |tcx| "processing `{}`", tcx.def_path_str(key.to_def_id()) }
674 /// The signature of functions.
675 query fn_sig(key: DefId) -> ty::PolyFnSig<'tcx> {
676 desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }
679 query lint_mod(key: LocalDefId) -> () {
680 desc { |tcx| "linting {}", describe_as_module(key, tcx) }
683 /// Checks the attributes in the module.
684 query check_mod_attrs(key: LocalDefId) -> () {
685 desc { |tcx| "checking attributes in {}", describe_as_module(key, tcx) }
688 query check_mod_unstable_api_usage(key: LocalDefId) -> () {
689 desc { |tcx| "checking for unstable API usage in {}", describe_as_module(key, tcx) }
692 /// Checks the const bodies in the module for illegal operations (e.g. `if` or `loop`).
693 query check_mod_const_bodies(key: LocalDefId) -> () {
694 desc { |tcx| "checking consts in {}", describe_as_module(key, tcx) }
697 /// Checks the loops in the module.
698 query check_mod_loops(key: LocalDefId) -> () {
699 desc { |tcx| "checking loops in {}", describe_as_module(key, tcx) }
702 query check_mod_naked_functions(key: LocalDefId) -> () {
703 desc { |tcx| "checking naked functions in {}", describe_as_module(key, tcx) }
706 query check_mod_item_types(key: LocalDefId) -> () {
707 desc { |tcx| "checking item types in {}", describe_as_module(key, tcx) }
710 query check_mod_privacy(key: LocalDefId) -> () {
711 desc { |tcx| "checking privacy in {}", describe_as_module(key, tcx) }
714 query check_mod_intrinsics(key: LocalDefId) -> () {
715 desc { |tcx| "checking intrinsics in {}", describe_as_module(key, tcx) }
718 query check_mod_liveness(key: LocalDefId) -> () {
719 desc { |tcx| "checking liveness of variables in {}", describe_as_module(key, tcx) }
722 query check_mod_impl_wf(key: LocalDefId) -> () {
723 desc { |tcx| "checking that impls are well-formed in {}", describe_as_module(key, tcx) }
726 query collect_mod_item_types(key: LocalDefId) -> () {
727 desc { |tcx| "collecting item types in {}", describe_as_module(key, tcx) }
730 /// Caches `CoerceUnsized` kinds for impls on custom types.
731 query coerce_unsized_info(key: DefId)
732 -> ty::adjustment::CoerceUnsizedInfo {
733 desc { |tcx| "computing CoerceUnsized info for `{}`", tcx.def_path_str(key) }
736 query typeck_item_bodies(_: ()) -> () {
737 desc { "type-checking all item bodies" }
740 query typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
741 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
742 cache_on_disk_if { true }
744 query typeck_const_arg(
745 key: (LocalDefId, DefId)
746 ) -> &'tcx ty::TypeckResults<'tcx> {
748 |tcx| "type-checking the const argument `{}`",
749 tcx.def_path_str(key.0.to_def_id()),
752 query diagnostic_only_typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
753 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
754 cache_on_disk_if { true }
755 load_cached(tcx, id) {
756 let typeck_results: Option<ty::TypeckResults<'tcx>> = tcx
757 .on_disk_cache().as_ref()
758 .and_then(|c| c.try_load_query_result(*tcx, id));
760 typeck_results.map(|x| &*tcx.arena.alloc(x))
764 query used_trait_imports(key: LocalDefId) -> &'tcx FxHashSet<LocalDefId> {
765 desc { |tcx| "used_trait_imports `{}`", tcx.def_path_str(key.to_def_id()) }
766 cache_on_disk_if { true }
769 query has_typeck_results(def_id: DefId) -> bool {
770 desc { |tcx| "checking whether `{}` has a body", tcx.def_path_str(def_id) }
773 query coherent_trait(def_id: DefId) -> () {
774 desc { |tcx| "coherence checking all impls of trait `{}`", tcx.def_path_str(def_id) }
777 /// Borrow-checks the function body. If this is a closure, returns
778 /// additional requirements that the closure's creator must verify.
779 query mir_borrowck(key: LocalDefId) -> &'tcx mir::BorrowCheckResult<'tcx> {
780 desc { |tcx| "borrow-checking `{}`", tcx.def_path_str(key.to_def_id()) }
781 cache_on_disk_if(tcx, opt_result) {
782 tcx.is_closure(key.to_def_id())
783 || opt_result.map_or(false, |r| !r.concrete_opaque_types.is_empty())
786 query mir_borrowck_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::BorrowCheckResult<'tcx> {
788 |tcx| "borrow-checking the const argument`{}`",
789 tcx.def_path_str(key.0.to_def_id())
793 /// Gets a complete map from all types to their inherent impls.
794 /// Not meant to be used directly outside of coherence.
795 query crate_inherent_impls(k: ()) -> CrateInherentImpls {
796 storage(ArenaCacheSelector<'tcx>)
798 desc { "all inherent impls defined in crate" }
801 /// Checks all types in the crate for overlap in their inherent impls. Reports errors.
802 /// Not meant to be used directly outside of coherence.
803 query crate_inherent_impls_overlap_check(_: ())
806 desc { "check for overlap between inherent impls defined in this crate" }
809 /// Check whether the function has any recursion that could cause the inliner to trigger
810 /// a cycle. Returns the call stack causing the cycle. The call stack does not contain the
811 /// current function, just all intermediate functions.
812 query mir_callgraph_reachable(key: (ty::Instance<'tcx>, LocalDefId)) -> bool {
815 "computing if `{}` (transitively) calls `{}`",
817 tcx.def_path_str(key.1.to_def_id()),
821 /// Obtain all the calls into other local functions
822 query mir_inliner_callees(key: ty::InstanceDef<'tcx>) -> &'tcx [(DefId, SubstsRef<'tcx>)] {
825 "computing all local function calls in `{}`",
826 tcx.def_path_str(key.def_id()),
830 /// Evaluates a constant and returns the computed allocation.
832 /// **Do not use this** directly, use the `tcx.eval_static_initializer` wrapper.
833 query eval_to_allocation_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
834 -> EvalToAllocationRawResult<'tcx> {
836 "const-evaluating + checking `{}`",
837 key.value.display(tcx)
839 cache_on_disk_if { true }
842 /// Evaluates const items or anonymous constants
843 /// (such as enum variant explicit discriminants or array lengths)
844 /// into a representation suitable for the type system and const generics.
846 /// **Do not use this** directly, use one of the following wrappers: `tcx.const_eval_poly`,
847 /// `tcx.const_eval_resolve`, `tcx.const_eval_instance`, or `tcx.const_eval_global_id`.
848 query eval_to_const_value_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
849 -> EvalToConstValueResult<'tcx> {
851 "simplifying constant for the type system `{}`",
852 key.value.display(tcx)
854 cache_on_disk_if { true }
857 /// Convert an evaluated constant to a type level constant or
858 /// return `None` if that is not possible.
859 query const_to_valtree(
860 key: ty::ParamEnvAnd<'tcx, ConstAlloc<'tcx>>
861 ) -> Option<ty::ValTree<'tcx>> {
862 desc { "destructure constant" }
865 /// Destructure a constant ADT or array into its variant index and its
867 query destructure_const(
868 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
869 ) -> mir::DestructuredConst<'tcx> {
870 desc { "destructure constant" }
873 /// Dereference a constant reference or raw pointer and turn the result into a constant
876 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
877 ) -> &'tcx ty::Const<'tcx> {
878 desc { "deref constant" }
881 query const_caller_location(key: (rustc_span::Symbol, u32, u32)) -> ConstValue<'tcx> {
882 desc { "get a &core::panic::Location referring to a span" }
886 key: LitToConstInput<'tcx>
887 ) -> Result<&'tcx ty::Const<'tcx>, LitToConstError> {
888 desc { "converting literal to const" }
891 query check_match(key: DefId) {
892 desc { |tcx| "match-checking `{}`", tcx.def_path_str(key) }
893 cache_on_disk_if { key.is_local() }
896 /// Performs part of the privacy check and computes "access levels".
897 query privacy_access_levels(_: ()) -> &'tcx AccessLevels {
899 desc { "privacy access levels" }
901 query check_private_in_public(_: ()) -> () {
903 desc { "checking for private elements in public interfaces" }
906 query reachable_set(_: ()) -> FxHashSet<LocalDefId> {
907 storage(ArenaCacheSelector<'tcx>)
908 desc { "reachability" }
911 /// Per-body `region::ScopeTree`. The `DefId` should be the owner `DefId` for the body;
912 /// in the case of closures, this will be redirected to the enclosing function.
913 query region_scope_tree(def_id: DefId) -> &'tcx region::ScopeTree {
914 desc { |tcx| "computing drop scopes for `{}`", tcx.def_path_str(def_id) }
917 query mir_shims(key: ty::InstanceDef<'tcx>) -> mir::Body<'tcx> {
918 storage(ArenaCacheSelector<'tcx>)
919 desc { |tcx| "generating MIR shim for `{}`", tcx.def_path_str(key.def_id()) }
922 /// The `symbol_name` query provides the symbol name for calling a
923 /// given instance from the local crate. In particular, it will also
924 /// look up the correct symbol name of instances from upstream crates.
925 query symbol_name(key: ty::Instance<'tcx>) -> ty::SymbolName<'tcx> {
926 desc { "computing the symbol for `{}`", key }
927 cache_on_disk_if { true }
930 query opt_def_kind(def_id: DefId) -> Option<DefKind> {
931 desc { |tcx| "looking up definition kind of `{}`", tcx.def_path_str(def_id) }
934 query def_span(def_id: DefId) -> Span {
935 desc { |tcx| "looking up span for `{}`", tcx.def_path_str(def_id) }
936 // FIXME(mw): DefSpans are not really inputs since they are derived from
937 // HIR. But at the moment HIR hashing still contains some hacks that allow
938 // to make type debuginfo to be source location independent. Declaring
939 // DefSpan an input makes sure that changes to these are always detected
940 // regardless of HIR hashing.
944 query def_ident_span(def_id: DefId) -> Option<Span> {
945 desc { |tcx| "looking up span for `{}`'s identifier", tcx.def_path_str(def_id) }
948 query lookup_stability(def_id: DefId) -> Option<&'tcx attr::Stability> {
949 desc { |tcx| "looking up stability of `{}`", tcx.def_path_str(def_id) }
952 query lookup_const_stability(def_id: DefId) -> Option<&'tcx attr::ConstStability> {
953 desc { |tcx| "looking up const stability of `{}`", tcx.def_path_str(def_id) }
956 query should_inherit_track_caller(def_id: DefId) -> bool {
957 desc { |tcx| "computing should_inherit_track_caller of `{}`", tcx.def_path_str(def_id) }
960 query lookup_deprecation_entry(def_id: DefId) -> Option<DeprecationEntry> {
961 desc { |tcx| "checking whether `{}` is deprecated", tcx.def_path_str(def_id) }
964 query item_attrs(def_id: DefId) -> &'tcx [ast::Attribute] {
965 desc { |tcx| "collecting attributes of `{}`", tcx.def_path_str(def_id) }
968 query codegen_fn_attrs(def_id: DefId) -> CodegenFnAttrs {
969 desc { |tcx| "computing codegen attributes of `{}`", tcx.def_path_str(def_id) }
970 storage(ArenaCacheSelector<'tcx>)
971 cache_on_disk_if { true }
974 query fn_arg_names(def_id: DefId) -> &'tcx [rustc_span::symbol::Ident] {
975 desc { |tcx| "looking up function parameter names for `{}`", tcx.def_path_str(def_id) }
977 /// Gets the rendered value of the specified constant or associated constant.
979 query rendered_const(def_id: DefId) -> String {
980 desc { |tcx| "rendering constant intializer of `{}`", tcx.def_path_str(def_id) }
982 query impl_parent(def_id: DefId) -> Option<DefId> {
983 desc { |tcx| "computing specialization parent impl of `{}`", tcx.def_path_str(def_id) }
986 /// Given an `associated_item`, find the trait it belongs to.
987 /// Return `None` if the `DefId` is not an associated item.
988 query trait_of_item(associated_item: DefId) -> Option<DefId> {
989 desc { |tcx| "finding trait defining `{}`", tcx.def_path_str(associated_item) }
992 query is_ctfe_mir_available(key: DefId) -> bool {
993 desc { |tcx| "checking if item has ctfe mir available: `{}`", tcx.def_path_str(key) }
995 query is_mir_available(key: DefId) -> bool {
996 desc { |tcx| "checking if item has mir available: `{}`", tcx.def_path_str(key) }
999 query own_existential_vtable_entries(
1000 key: ty::PolyExistentialTraitRef<'tcx>
1001 ) -> &'tcx [DefId] {
1002 desc { |tcx| "finding all existential vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1005 query vtable_entries(key: ty::PolyTraitRef<'tcx>)
1006 -> &'tcx [ty::VtblEntry<'tcx>] {
1007 desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1010 query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::Ty<'tcx>, ty::Ty<'tcx>)) -> Option<usize> {
1011 desc { |tcx| "finding the slot within vtable for trait object {} vtable ptr during trait upcasting coercion from {} vtable",
1015 query vtable_allocation(key: (Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>)) -> mir::interpret::AllocId {
1016 desc { |tcx| "vtable const allocation for <{} as {}>",
1018 key.1.map(|trait_ref| format!("{}", trait_ref)).unwrap_or("_".to_owned())
1022 query codegen_fulfill_obligation(
1023 key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
1024 ) -> Result<ImplSource<'tcx, ()>, ErrorReported> {
1025 cache_on_disk_if { true }
1027 "checking if `{}` fulfills its obligations",
1028 tcx.def_path_str(key.1.def_id())
1032 /// Return all `impl` blocks in the current crate.
1034 /// To allow caching this between crates, you must pass in [`LOCAL_CRATE`] as the crate number.
1035 /// Passing in any other crate will cause an ICE.
1037 /// [`LOCAL_CRATE`]: rustc_hir::def_id::LOCAL_CRATE
1038 query all_local_trait_impls(_: ()) -> &'tcx BTreeMap<DefId, Vec<LocalDefId>> {
1039 desc { "local trait impls" }
1042 /// Given a trait `trait_id`, return all known `impl` blocks.
1043 query trait_impls_of(trait_id: DefId) -> ty::trait_def::TraitImpls {
1044 storage(ArenaCacheSelector<'tcx>)
1045 desc { |tcx| "trait impls of `{}`", tcx.def_path_str(trait_id) }
1048 query specialization_graph_of(trait_id: DefId) -> specialization_graph::Graph {
1049 storage(ArenaCacheSelector<'tcx>)
1050 desc { |tcx| "building specialization graph of trait `{}`", tcx.def_path_str(trait_id) }
1051 cache_on_disk_if { true }
1053 query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
1054 desc { |tcx| "determine object safety of trait `{}`", tcx.def_path_str(trait_id) }
1057 /// Gets the ParameterEnvironment for a given item; this environment
1058 /// will be in "user-facing" mode, meaning that it is suitable for
1059 /// type-checking etc, and it does not normalize specializable
1060 /// associated types. This is almost always what you want,
1061 /// unless you are doing MIR optimizations, in which case you
1062 /// might want to use `reveal_all()` method to change modes.
1063 query param_env(def_id: DefId) -> ty::ParamEnv<'tcx> {
1064 desc { |tcx| "computing normalized predicates of `{}`", tcx.def_path_str(def_id) }
1067 /// Like `param_env`, but returns the `ParamEnv` in `Reveal::All` mode.
1068 /// Prefer this over `tcx.param_env(def_id).with_reveal_all_normalized(tcx)`,
1069 /// as this method is more efficient.
1070 query param_env_reveal_all_normalized(def_id: DefId) -> ty::ParamEnv<'tcx> {
1071 desc { |tcx| "computing revealed normalized predicates of `{}`", tcx.def_path_str(def_id) }
1074 /// Trait selection queries. These are best used by invoking `ty.is_copy_modulo_regions()`,
1075 /// `ty.is_copy()`, etc, since that will prune the environment where possible.
1076 query is_copy_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1077 desc { "computing whether `{}` is `Copy`", env.value }
1079 /// Query backing `TyS::is_sized`.
1080 query is_sized_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1081 desc { "computing whether `{}` is `Sized`", env.value }
1083 /// Query backing `TyS::is_freeze`.
1084 query is_freeze_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1085 desc { "computing whether `{}` is freeze", env.value }
1087 /// Query backing `TyS::is_unpin`.
1088 query is_unpin_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1089 desc { "computing whether `{}` is `Unpin`", env.value }
1091 /// Query backing `TyS::needs_drop`.
1092 query needs_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1093 desc { "computing whether `{}` needs drop", env.value }
1095 /// Query backing `TyS::has_significant_drop_raw`.
1096 query has_significant_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1097 desc { "computing whether `{}` has a significant drop", env.value }
1100 /// Query backing `TyS::is_structural_eq_shallow`.
1102 /// This is only correct for ADTs. Call `is_structural_eq_shallow` to handle all types
1104 query has_structural_eq_impls(ty: Ty<'tcx>) -> bool {
1106 "computing whether `{:?}` implements `PartialStructuralEq` and `StructuralEq`",
1111 /// A list of types where the ADT requires drop if and only if any of
1112 /// those types require drop. If the ADT is known to always need drop
1113 /// then `Err(AlwaysRequiresDrop)` is returned.
1114 query adt_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1115 desc { |tcx| "computing when `{}` needs drop", tcx.def_path_str(def_id) }
1116 cache_on_disk_if { true }
1119 /// A list of types where the ADT requires drop if and only if any of those types
1120 /// has significant drop. A type marked with the attribute `rustc_insignificant_dtor`
1121 /// is considered to not be significant. A drop is significant if it is implemented
1122 /// by the user or does anything that will have any observable behavior (other than
1123 /// freeing up memory). If the ADT is known to have a significant destructor then
1124 /// `Err(AlwaysRequiresDrop)` is returned.
1125 query adt_significant_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1126 desc { |tcx| "computing when `{}` has a significant destructor", tcx.def_path_str(def_id) }
1127 cache_on_disk_if { false }
1130 /// Computes the layout of a type. Note that this implicitly
1131 /// executes in "reveal all" mode, and will normalize the input type.
1133 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1134 ) -> Result<ty::layout::TyAndLayout<'tcx>, ty::layout::LayoutError<'tcx>> {
1135 desc { "computing layout of `{}`", key.value }
1138 /// Compute a `FnAbi` suitable for indirect calls, i.e. to `fn` pointers.
1140 /// NB: this doesn't handle virtual calls - those should use `fn_abi_of_instance`
1141 /// instead, where the instance is an `InstanceDef::Virtual`.
1142 query fn_abi_of_fn_ptr(
1143 key: ty::ParamEnvAnd<'tcx, (ty::PolyFnSig<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1144 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1145 desc { "computing call ABI of `{}` function pointers", key.value.0 }
1148 /// Compute a `FnAbi` suitable for declaring/defining an `fn` instance, and for
1149 /// direct calls to an `fn`.
1151 /// NB: that includes virtual calls, which are represented by "direct calls"
1152 /// to an `InstanceDef::Virtual` instance (of `<dyn Trait as Trait>::fn`).
1153 query fn_abi_of_instance(
1154 key: ty::ParamEnvAnd<'tcx, (ty::Instance<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1155 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1156 desc { "computing call ABI of `{}`", key.value.0 }
1159 query dylib_dependency_formats(_: CrateNum)
1160 -> &'tcx [(CrateNum, LinkagePreference)] {
1161 desc { "dylib dependency formats of crate" }
1164 query dependency_formats(_: ()) -> Lrc<crate::middle::dependency_format::Dependencies> {
1165 desc { "get the linkage format of all dependencies" }
1168 query is_compiler_builtins(_: CrateNum) -> bool {
1170 desc { "checking if the crate is_compiler_builtins" }
1172 query has_global_allocator(_: CrateNum) -> bool {
1173 // This query depends on untracked global state in CStore
1176 desc { "checking if the crate has_global_allocator" }
1178 query has_panic_handler(_: CrateNum) -> bool {
1180 desc { "checking if the crate has_panic_handler" }
1182 query is_profiler_runtime(_: CrateNum) -> bool {
1184 desc { "query a crate is `#![profiler_runtime]`" }
1186 query panic_strategy(_: CrateNum) -> PanicStrategy {
1188 desc { "query a crate's configured panic strategy" }
1190 query panic_in_drop_strategy(_: CrateNum) -> PanicStrategy {
1192 desc { "query a crate's configured panic-in-drop strategy" }
1194 query is_no_builtins(_: CrateNum) -> bool {
1196 desc { "test whether a crate has `#![no_builtins]`" }
1198 query symbol_mangling_version(_: CrateNum) -> SymbolManglingVersion {
1200 desc { "query a crate's symbol mangling version" }
1203 query extern_crate(def_id: DefId) -> Option<&'tcx ExternCrate> {
1205 desc { "getting crate's ExternCrateData" }
1208 query specializes(_: (DefId, DefId)) -> bool {
1209 desc { "computing whether impls specialize one another" }
1211 query in_scope_traits_map(_: LocalDefId)
1212 -> Option<&'tcx FxHashMap<ItemLocalId, Box<[TraitCandidate]>>> {
1213 desc { "traits in scope at a block" }
1216 query module_exports(def_id: LocalDefId) -> Option<&'tcx [Export]> {
1217 desc { |tcx| "looking up items exported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1220 query impl_defaultness(def_id: DefId) -> hir::Defaultness {
1221 desc { |tcx| "looking up whether `{}` is a default impl", tcx.def_path_str(def_id) }
1224 query impl_constness(def_id: DefId) -> hir::Constness {
1225 desc { |tcx| "looking up whether `{}` is a const impl", tcx.def_path_str(def_id) }
1228 query check_item_well_formed(key: LocalDefId) -> () {
1229 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1231 query check_trait_item_well_formed(key: LocalDefId) -> () {
1232 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1234 query check_impl_item_well_formed(key: LocalDefId) -> () {
1235 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1238 // The `DefId`s of all non-generic functions and statics in the given crate
1239 // that can be reached from outside the crate.
1241 // We expect this items to be available for being linked to.
1243 // This query can also be called for `LOCAL_CRATE`. In this case it will
1244 // compute which items will be reachable to other crates, taking into account
1245 // the kind of crate that is currently compiled. Crates with only a
1246 // C interface have fewer reachable things.
1248 // Does not include external symbols that don't have a corresponding DefId,
1249 // like the compiler-generated `main` function and so on.
1250 query reachable_non_generics(_: CrateNum)
1251 -> DefIdMap<SymbolExportLevel> {
1252 storage(ArenaCacheSelector<'tcx>)
1253 desc { "looking up the exported symbols of a crate" }
1255 query is_reachable_non_generic(def_id: DefId) -> bool {
1256 desc { |tcx| "checking whether `{}` is an exported symbol", tcx.def_path_str(def_id) }
1258 query is_unreachable_local_definition(def_id: LocalDefId) -> bool {
1260 "checking whether `{}` is reachable from outside the crate",
1261 tcx.def_path_str(def_id.to_def_id()),
1265 /// The entire set of monomorphizations the local crate can safely link
1266 /// to because they are exported from upstream crates. Do not depend on
1267 /// this directly, as its value changes anytime a monomorphization gets
1268 /// added or removed in any upstream crate. Instead use the narrower
1269 /// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
1270 /// better, `Instance::upstream_monomorphization()`.
1271 query upstream_monomorphizations(_: ()) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1272 storage(ArenaCacheSelector<'tcx>)
1273 desc { "collecting available upstream monomorphizations" }
1276 /// Returns the set of upstream monomorphizations available for the
1277 /// generic function identified by the given `def_id`. The query makes
1278 /// sure to make a stable selection if the same monomorphization is
1279 /// available in multiple upstream crates.
1281 /// You likely want to call `Instance::upstream_monomorphization()`
1282 /// instead of invoking this query directly.
1283 query upstream_monomorphizations_for(def_id: DefId)
1284 -> Option<&'tcx FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1286 "collecting available upstream monomorphizations for `{}`",
1287 tcx.def_path_str(def_id),
1291 /// Returns the upstream crate that exports drop-glue for the given
1292 /// type (`substs` is expected to be a single-item list containing the
1293 /// type one wants drop-glue for).
1295 /// This is a subset of `upstream_monomorphizations_for` in order to
1296 /// increase dep-tracking granularity. Otherwise adding or removing any
1297 /// type with drop-glue in any upstream crate would invalidate all
1298 /// functions calling drop-glue of an upstream type.
1300 /// You likely want to call `Instance::upstream_monomorphization()`
1301 /// instead of invoking this query directly.
1303 /// NOTE: This query could easily be extended to also support other
1304 /// common functions that have are large set of monomorphizations
1305 /// (like `Clone::clone` for example).
1306 query upstream_drop_glue_for(substs: SubstsRef<'tcx>) -> Option<CrateNum> {
1307 desc { "available upstream drop-glue for `{:?}`", substs }
1310 query foreign_modules(_: CrateNum) -> Lrc<FxHashMap<DefId, ForeignModule>> {
1311 desc { "looking up the foreign modules of a linked crate" }
1314 /// Identifies the entry-point (e.g., the `main` function) for a given
1315 /// crate, returning `None` if there is no entry point (such as for library crates).
1316 query entry_fn(_: ()) -> Option<(DefId, EntryFnType)> {
1317 desc { "looking up the entry function of a crate" }
1319 query proc_macro_decls_static(_: ()) -> Option<LocalDefId> {
1320 desc { "looking up the derive registrar for a crate" }
1322 // The macro which defines `rustc_metadata::provide_extern` depends on this query's name.
1323 // Changing the name should cause a compiler error, but in case that changes, be aware.
1324 query crate_hash(_: CrateNum) -> Svh {
1326 desc { "looking up the hash a crate" }
1328 query crate_host_hash(_: CrateNum) -> Option<Svh> {
1330 desc { "looking up the hash of a host version of a crate" }
1332 query extra_filename(_: CrateNum) -> String {
1334 desc { "looking up the extra filename for a crate" }
1336 query crate_extern_paths(_: CrateNum) -> Vec<PathBuf> {
1338 desc { "looking up the paths for extern crates" }
1341 /// Given a crate and a trait, look up all impls of that trait in the crate.
1342 /// Return `(impl_id, self_ty)`.
1343 query implementations_of_trait(_: (CrateNum, DefId))
1344 -> &'tcx [(DefId, Option<ty::fast_reject::SimplifiedType>)] {
1345 desc { "looking up implementations of a trait in a crate" }
1348 /// Given a crate, look up all trait impls in that crate.
1349 /// Return `(impl_id, self_ty)`.
1350 query all_trait_implementations(_: CrateNum)
1351 -> &'tcx [(DefId, Option<ty::fast_reject::SimplifiedType>)] {
1352 desc { "looking up all (?) trait implementations" }
1355 query is_dllimport_foreign_item(def_id: DefId) -> bool {
1356 desc { |tcx| "is_dllimport_foreign_item({})", tcx.def_path_str(def_id) }
1358 query is_statically_included_foreign_item(def_id: DefId) -> bool {
1359 desc { |tcx| "is_statically_included_foreign_item({})", tcx.def_path_str(def_id) }
1361 query native_library_kind(def_id: DefId)
1362 -> Option<NativeLibKind> {
1363 desc { |tcx| "native_library_kind({})", tcx.def_path_str(def_id) }
1366 /// Does lifetime resolution, but does not descend into trait items. This
1367 /// should only be used for resolving lifetimes of on trait definitions,
1368 /// and is used to avoid cycles. Importantly, `resolve_lifetimes` still visits
1369 /// the same lifetimes and is responsible for diagnostics.
1370 /// See `rustc_resolve::late::lifetimes for details.
1371 query resolve_lifetimes_trait_definition(_: LocalDefId) -> ResolveLifetimes {
1372 storage(ArenaCacheSelector<'tcx>)
1373 desc { "resolving lifetimes for a trait definition" }
1375 /// Does lifetime resolution on items. Importantly, we can't resolve
1376 /// lifetimes directly on things like trait methods, because of trait params.
1377 /// See `rustc_resolve::late::lifetimes for details.
1378 query resolve_lifetimes(_: LocalDefId) -> ResolveLifetimes {
1379 storage(ArenaCacheSelector<'tcx>)
1380 desc { "resolving lifetimes" }
1382 query named_region_map(_: LocalDefId) ->
1383 Option<&'tcx FxHashMap<ItemLocalId, Region>> {
1384 desc { "looking up a named region" }
1386 query is_late_bound_map(_: LocalDefId) ->
1387 Option<(LocalDefId, &'tcx FxHashSet<ItemLocalId>)> {
1388 desc { "testing if a region is late bound" }
1390 /// For a given item (like a struct), gets the default lifetimes to be used
1391 /// for each parameter if a trait object were to be passed for that parameter.
1392 /// For example, for `struct Foo<'a, T, U>`, this would be `['static, 'static]`.
1393 /// For `struct Foo<'a, T: 'a, U>`, this would instead be `['a, 'static]`.
1394 query object_lifetime_defaults_map(_: LocalDefId)
1395 -> Option<Vec<ObjectLifetimeDefault>> {
1396 desc { "looking up lifetime defaults for a region on an item" }
1398 query late_bound_vars_map(_: LocalDefId)
1399 -> Option<&'tcx FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
1400 desc { "looking up late bound vars" }
1403 query lifetime_scope_map(_: LocalDefId) -> Option<FxHashMap<ItemLocalId, LifetimeScopeForPath>> {
1404 desc { "finds the lifetime scope for an HirId of a PathSegment" }
1407 query visibility(def_id: DefId) -> ty::Visibility {
1408 desc { |tcx| "computing visibility of `{}`", tcx.def_path_str(def_id) }
1411 /// Computes the set of modules from which this type is visibly uninhabited.
1412 /// To check whether a type is uninhabited at all (not just from a given module), you could
1413 /// check whether the forest is empty.
1414 query type_uninhabited_from(
1415 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1416 ) -> ty::inhabitedness::DefIdForest {
1417 desc { "computing the inhabitedness of `{:?}`", key }
1420 query dep_kind(_: CrateNum) -> CrateDepKind {
1422 desc { "fetching what a dependency looks like" }
1424 query crate_name(_: CrateNum) -> Symbol {
1426 desc { "fetching what a crate is named" }
1428 query item_children(def_id: DefId) -> &'tcx [Export] {
1429 desc { |tcx| "collecting child items of `{}`", tcx.def_path_str(def_id) }
1431 query extern_mod_stmt_cnum(def_id: LocalDefId) -> Option<CrateNum> {
1432 desc { |tcx| "computing crate imported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1435 query get_lib_features(_: ()) -> LibFeatures {
1436 storage(ArenaCacheSelector<'tcx>)
1438 desc { "calculating the lib features map" }
1440 query defined_lib_features(_: CrateNum)
1441 -> &'tcx [(Symbol, Option<Symbol>)] {
1442 desc { "calculating the lib features defined in a crate" }
1444 /// Returns the lang items defined in another crate by loading it from metadata.
1445 query get_lang_items(_: ()) -> LanguageItems {
1446 storage(ArenaCacheSelector<'tcx>)
1448 desc { "calculating the lang items map" }
1451 /// Returns all diagnostic items defined in all crates.
1452 query all_diagnostic_items(_: ()) -> rustc_hir::diagnostic_items::DiagnosticItems {
1453 storage(ArenaCacheSelector<'tcx>)
1455 desc { "calculating the diagnostic items map" }
1458 /// Returns the lang items defined in another crate by loading it from metadata.
1459 query defined_lang_items(_: CrateNum) -> &'tcx [(DefId, usize)] {
1460 desc { "calculating the lang items defined in a crate" }
1463 /// Returns the diagnostic items defined in a crate.
1464 query diagnostic_items(_: CrateNum) -> rustc_hir::diagnostic_items::DiagnosticItems {
1465 storage(ArenaCacheSelector<'tcx>)
1466 desc { "calculating the diagnostic items map in a crate" }
1469 query missing_lang_items(_: CrateNum) -> &'tcx [LangItem] {
1470 desc { "calculating the missing lang items in a crate" }
1472 query visible_parent_map(_: ()) -> DefIdMap<DefId> {
1473 storage(ArenaCacheSelector<'tcx>)
1474 desc { "calculating the visible parent map" }
1476 query trimmed_def_paths(_: ()) -> FxHashMap<DefId, Symbol> {
1477 storage(ArenaCacheSelector<'tcx>)
1478 desc { "calculating trimmed def paths" }
1480 query missing_extern_crate_item(_: CrateNum) -> bool {
1482 desc { "seeing if we're missing an `extern crate` item for this crate" }
1484 query used_crate_source(_: CrateNum) -> Lrc<CrateSource> {
1486 desc { "looking at the source for a crate" }
1488 query postorder_cnums(_: ()) -> &'tcx [CrateNum] {
1490 desc { "generating a postorder list of CrateNums" }
1492 /// Returns whether or not the crate with CrateNum 'cnum'
1493 /// is marked as a private dependency
1494 query is_private_dep(c: CrateNum) -> bool {
1496 desc { "check whether crate {} is a private dependency", c }
1498 query allocator_kind(_: ()) -> Option<AllocatorKind> {
1500 desc { "allocator kind for the current crate" }
1503 query upvars_mentioned(def_id: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
1504 desc { |tcx| "collecting upvars mentioned in `{}`", tcx.def_path_str(def_id) }
1507 query maybe_unused_trait_import(def_id: LocalDefId) -> bool {
1508 desc { |tcx| "maybe_unused_trait_import for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1510 query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
1511 desc { "looking up all possibly unused extern crates" }
1513 query names_imported_by_glob_use(def_id: LocalDefId) -> &'tcx FxHashSet<Symbol> {
1514 desc { |tcx| "names_imported_by_glob_use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1517 query stability_index(_: ()) -> stability::Index<'tcx> {
1518 storage(ArenaCacheSelector<'tcx>)
1520 desc { "calculating the stability index for the local crate" }
1522 query crates(_: ()) -> &'tcx [CrateNum] {
1524 desc { "fetching all foreign CrateNum instances" }
1527 /// A vector of every trait accessible in the whole crate
1528 /// (i.e., including those from subcrates). This is used only for
1529 /// error reporting.
1530 query all_traits(_: ()) -> &'tcx [DefId] {
1531 desc { "fetching all foreign and local traits" }
1534 /// The list of symbols exported from the given crate.
1536 /// - All names contained in `exported_symbols(cnum)` are guaranteed to
1537 /// correspond to a publicly visible symbol in `cnum` machine code.
1538 /// - The `exported_symbols` sets of different crates do not intersect.
1539 query exported_symbols(_: CrateNum)
1540 -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1541 desc { "exported_symbols" }
1544 query collect_and_partition_mono_items(_: ()) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
1546 desc { "collect_and_partition_mono_items" }
1548 query is_codegened_item(def_id: DefId) -> bool {
1549 desc { |tcx| "determining whether `{}` needs codegen", tcx.def_path_str(def_id) }
1552 /// All items participating in code generation together with items inlined into them.
1553 query codegened_and_inlined_items(_: ()) -> &'tcx DefIdSet {
1555 desc { "codegened_and_inlined_items" }
1558 query codegen_unit(_: Symbol) -> &'tcx CodegenUnit<'tcx> {
1559 desc { "codegen_unit" }
1561 query unused_generic_params(key: ty::InstanceDef<'tcx>) -> FiniteBitSet<u32> {
1562 cache_on_disk_if { key.def_id().is_local() }
1564 |tcx| "determining which generic parameters are unused by `{}`",
1565 tcx.def_path_str(key.def_id())
1568 query backend_optimization_level(_: ()) -> OptLevel {
1569 desc { "optimization level used by backend" }
1572 query output_filenames(_: ()) -> Arc<OutputFilenames> {
1574 desc { "output_filenames" }
1577 /// Do not call this query directly: invoke `normalize` instead.
1578 query normalize_projection_ty(
1579 goal: CanonicalProjectionGoal<'tcx>
1581 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, NormalizationResult<'tcx>>>,
1584 desc { "normalizing `{:?}`", goal }
1587 /// Do not call this query directly: invoke `normalize_erasing_regions` instead.
1588 query normalize_generic_arg_after_erasing_regions(
1589 goal: ParamEnvAnd<'tcx, GenericArg<'tcx>>
1590 ) -> GenericArg<'tcx> {
1591 desc { "normalizing `{}`", goal.value }
1594 /// Do not call this query directly: invoke `normalize_erasing_regions` instead.
1595 query normalize_mir_const_after_erasing_regions(
1596 goal: ParamEnvAnd<'tcx, mir::ConstantKind<'tcx>>
1597 ) -> mir::ConstantKind<'tcx> {
1598 desc { "normalizing `{}`", goal.value }
1601 query implied_outlives_bounds(
1602 goal: CanonicalTyGoal<'tcx>
1604 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Vec<OutlivesBound<'tcx>>>>,
1607 desc { "computing implied outlives bounds for `{:?}`", goal }
1610 /// Do not call this query directly: invoke `infcx.at().dropck_outlives()` instead.
1611 query dropck_outlives(
1612 goal: CanonicalTyGoal<'tcx>
1614 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>,
1617 desc { "computing dropck types for `{:?}`", goal }
1620 /// Do not call this query directly: invoke `infcx.predicate_may_hold()` or
1621 /// `infcx.predicate_must_hold()` instead.
1622 query evaluate_obligation(
1623 goal: CanonicalPredicateGoal<'tcx>
1624 ) -> Result<traits::EvaluationResult, traits::OverflowError> {
1625 desc { "evaluating trait selection obligation `{}`", goal.value.value }
1628 query evaluate_goal(
1629 goal: traits::CanonicalChalkEnvironmentAndGoal<'tcx>
1631 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1634 desc { "evaluating trait selection obligation `{}`", goal.value }
1637 /// Do not call this query directly: part of the `Eq` type-op
1638 query type_op_ascribe_user_type(
1639 goal: CanonicalTypeOpAscribeUserTypeGoal<'tcx>
1641 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1644 desc { "evaluating `type_op_ascribe_user_type` `{:?}`", goal }
1647 /// Do not call this query directly: part of the `Eq` type-op
1649 goal: CanonicalTypeOpEqGoal<'tcx>
1651 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1654 desc { "evaluating `type_op_eq` `{:?}`", goal }
1657 /// Do not call this query directly: part of the `Subtype` type-op
1658 query type_op_subtype(
1659 goal: CanonicalTypeOpSubtypeGoal<'tcx>
1661 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1664 desc { "evaluating `type_op_subtype` `{:?}`", goal }
1667 /// Do not call this query directly: part of the `ProvePredicate` type-op
1668 query type_op_prove_predicate(
1669 goal: CanonicalTypeOpProvePredicateGoal<'tcx>
1671 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1674 desc { "evaluating `type_op_prove_predicate` `{:?}`", goal }
1677 /// Do not call this query directly: part of the `Normalize` type-op
1678 query type_op_normalize_ty(
1679 goal: CanonicalTypeOpNormalizeGoal<'tcx, Ty<'tcx>>
1681 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Ty<'tcx>>>,
1684 desc { "normalizing `{:?}`", goal }
1687 /// Do not call this query directly: part of the `Normalize` type-op
1688 query type_op_normalize_predicate(
1689 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::Predicate<'tcx>>
1691 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::Predicate<'tcx>>>,
1694 desc { "normalizing `{:?}`", goal }
1697 /// Do not call this query directly: part of the `Normalize` type-op
1698 query type_op_normalize_poly_fn_sig(
1699 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::PolyFnSig<'tcx>>
1701 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::PolyFnSig<'tcx>>>,
1704 desc { "normalizing `{:?}`", goal }
1707 /// Do not call this query directly: part of the `Normalize` type-op
1708 query type_op_normalize_fn_sig(
1709 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::FnSig<'tcx>>
1711 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::FnSig<'tcx>>>,
1714 desc { "normalizing `{:?}`", goal }
1717 query subst_and_check_impossible_predicates(key: (DefId, SubstsRef<'tcx>)) -> bool {
1719 "impossible substituted predicates:`{}`",
1720 tcx.def_path_str(key.0)
1724 query method_autoderef_steps(
1725 goal: CanonicalTyGoal<'tcx>
1726 ) -> MethodAutoderefStepsResult<'tcx> {
1727 desc { "computing autoderef types for `{:?}`", goal }
1730 query supported_target_features(_: CrateNum) -> FxHashMap<String, Option<Symbol>> {
1731 storage(ArenaCacheSelector<'tcx>)
1733 desc { "looking up supported target features" }
1736 /// Get an estimate of the size of an InstanceDef based on its MIR for CGU partitioning.
1737 query instance_def_size_estimate(def: ty::InstanceDef<'tcx>)
1739 desc { |tcx| "estimating size for `{}`", tcx.def_path_str(def.def_id()) }
1742 query features_query(_: ()) -> &'tcx rustc_feature::Features {
1744 desc { "looking up enabled feature gates" }
1747 /// Attempt to resolve the given `DefId` to an `Instance`, for the
1748 /// given generics args (`SubstsRef`), returning one of:
1749 /// * `Ok(Some(instance))` on success
1750 /// * `Ok(None)` when the `SubstsRef` are still too generic,
1751 /// and therefore don't allow finding the final `Instance`
1752 /// * `Err(ErrorReported)` when the `Instance` resolution process
1753 /// couldn't complete due to errors elsewhere - this is distinct
1754 /// from `Ok(None)` to avoid misleading diagnostics when an error
1755 /// has already been/will be emitted, for the original cause
1756 query resolve_instance(
1757 key: ty::ParamEnvAnd<'tcx, (DefId, SubstsRef<'tcx>)>
1758 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1759 desc { "resolving instance `{}`", ty::Instance::new(key.value.0, key.value.1) }
1762 query resolve_instance_of_const_arg(
1763 key: ty::ParamEnvAnd<'tcx, (LocalDefId, DefId, SubstsRef<'tcx>)>
1764 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1766 "resolving instance of the const argument `{}`",
1767 ty::Instance::new(key.value.0.to_def_id(), key.value.2),
1771 query normalize_opaque_types(key: &'tcx ty::List<ty::Predicate<'tcx>>) -> &'tcx ty::List<ty::Predicate<'tcx>> {
1772 desc { "normalizing opaque types in {:?}", key }
1775 /// Checks whether a type is definitely uninhabited. This is
1776 /// conservative: for some types that are uninhabited we return `false`,
1777 /// but we only return `true` for types that are definitely uninhabited.
1778 /// `ty.conservative_is_privately_uninhabited` implies that any value of type `ty`
1779 /// will be `Abi::Uninhabited`. (Note that uninhabited types may have nonzero
1780 /// size, to account for partial initialisation. See #49298 for details.)
1781 query conservative_is_privately_uninhabited(key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1782 desc { "conservatively checking if {:?} is privately uninhabited", key }
1785 query limits(key: ()) -> Limits {
1786 desc { "looking up limits" }
1789 /// Performs an HIR-based well-formed check on the item with the given `HirId`. If
1790 /// we get an `Unimplemented` error that matches the provided `Predicate`, return
1791 /// the cause of the newly created obligation.
1793 /// This is only used by error-reporting code to get a better cause (in particular, a better
1794 /// span) for an *existing* error. Therefore, it is best-effort, and may never handle
1795 /// all of the cases that the normal `ty::Ty`-based wfcheck does. This is fine,
1796 /// because the `ty::Ty`-based wfcheck is always run.
1797 query diagnostic_hir_wf_check(key: (ty::Predicate<'tcx>, traits::WellFormedLoc)) -> Option<traits::ObligationCause<'tcx>> {
1800 desc { "performing HIR wf-checking for predicate {:?} at item {:?}", key.0, key.1 }