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> {
39 desc { "get the crate HIR" }
42 /// The items in a module.
44 /// This can be conveniently accessed by `tcx.hir().visit_item_likes_in_module`.
45 /// Avoid calling this query directly.
46 query hir_module_items(key: LocalDefId) -> rustc_middle::hir::ModuleItems {
47 storage(ArenaCacheSelector<'tcx>)
48 desc { |tcx| "HIR module items in `{}`", tcx.def_path_str(key.to_def_id()) }
51 /// Gives access to the HIR node for the HIR owner `key`.
53 /// This can be conveniently accessed by methods on `tcx.hir()`.
54 /// Avoid calling this query directly.
55 query hir_owner(key: LocalDefId) -> Option<crate::hir::Owner<'tcx>> {
56 desc { |tcx| "HIR owner of `{}`", tcx.def_path_str(key.to_def_id()) }
59 /// Gives access to the HIR node's parent for the HIR owner `key`.
61 /// This can be conveniently accessed by methods on `tcx.hir()`.
62 /// Avoid calling this query directly.
63 query hir_owner_parent(key: LocalDefId) -> hir::HirId {
64 desc { |tcx| "HIR parent of `{}`", tcx.def_path_str(key.to_def_id()) }
67 /// Gives access to the HIR nodes and bodies inside the HIR owner `key`.
69 /// This can be conveniently accessed by methods on `tcx.hir()`.
70 /// Avoid calling this query directly.
71 query hir_owner_nodes(key: LocalDefId) -> Option<&'tcx hir::OwnerNodes<'tcx>> {
72 desc { |tcx| "HIR owner items in `{}`", tcx.def_path_str(key.to_def_id()) }
75 /// Gives access to the HIR attributes inside the HIR owner `key`.
77 /// This can be conveniently accessed by methods on `tcx.hir()`.
78 /// Avoid calling this query directly.
79 query hir_attrs(key: LocalDefId) -> &'tcx hir::AttributeMap<'tcx> {
80 desc { |tcx| "HIR owner attributes in `{}`", tcx.def_path_str(key.to_def_id()) }
83 /// Computes the `DefId` of the corresponding const parameter in case the `key` is a
84 /// const argument and returns `None` otherwise.
86 /// ```ignore (incomplete)
87 /// let a = foo::<7>();
88 /// // ^ Calling `opt_const_param_of` for this argument,
90 /// fn foo<const N: usize>()
91 /// // ^ returns this `DefId`.
94 /// // ^ While calling `opt_const_param_of` for other bodies returns `None`.
97 // It looks like caching this query on disk actually slightly
98 // worsened performance in #74376.
100 // Once const generics are more prevalently used, we might want to
101 // consider only caching calls returning `Some`.
102 query opt_const_param_of(key: LocalDefId) -> Option<DefId> {
103 desc { |tcx| "computing the optional const parameter of `{}`", tcx.def_path_str(key.to_def_id()) }
106 /// Given the def_id of a const-generic parameter, computes the associated default const
107 /// parameter. e.g. `fn example<const N: usize=3>` called on `N` would return `3`.
108 query const_param_default(param: DefId) -> &'tcx ty::Const<'tcx> {
109 desc { |tcx| "compute const default for a given parameter `{}`", tcx.def_path_str(param) }
112 query default_anon_const_substs(key: DefId) -> SubstsRef<'tcx> {
113 desc { |tcx| "computing the default generic arguments for `{}`", tcx.def_path_str(key) }
116 /// Records the type of every item.
117 query type_of(key: DefId) -> Ty<'tcx> {
121 use rustc_hir::def::DefKind;
122 match tcx.def_kind(key) {
123 DefKind::TyAlias => "expanding type alias",
124 DefKind::TraitAlias => "expanding trait alias",
125 _ => "computing type of",
128 path = tcx.def_path_str(key),
130 cache_on_disk_if { key.is_local() }
133 query analysis(key: ()) -> Result<(), ErrorReported> {
135 desc { "running analysis passes on this crate" }
138 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to its
139 /// associated generics.
140 query generics_of(key: DefId) -> ty::Generics {
141 desc { |tcx| "computing generics of `{}`", tcx.def_path_str(key) }
142 storage(ArenaCacheSelector<'tcx>)
143 cache_on_disk_if { key.is_local() }
146 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
147 /// predicates (where-clauses) that must be proven true in order
148 /// to reference it. This is almost always the "predicates query"
151 /// `predicates_of` builds on `predicates_defined_on` -- in fact,
152 /// it is almost always the same as that query, except for the
153 /// case of traits. For traits, `predicates_of` contains
154 /// an additional `Self: Trait<...>` predicate that users don't
155 /// actually write. This reflects the fact that to invoke the
156 /// trait (e.g., via `Default::default`) you must supply types
157 /// that actually implement the trait. (However, this extra
158 /// predicate gets in the way of some checks, which are intended
159 /// to operate over only the actual where-clauses written by the
161 query predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
162 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
163 cache_on_disk_if { key.is_local() }
166 /// Returns the list of bounds that can be used for
167 /// `SelectionCandidate::ProjectionCandidate(_)` and
168 /// `ProjectionTyCandidate::TraitDef`.
169 /// Specifically this is the bounds written on the trait's type
170 /// definition, or those after the `impl` keyword
172 /// ```ignore (incomplete)
173 /// type X: Bound + 'lt
175 /// impl Debug + Display
176 /// // ^^^^^^^^^^^^^^^
179 /// `key` is the `DefId` of the associated type or opaque type.
181 /// Bounds from the parent (e.g. with nested impl trait) are not included.
182 query explicit_item_bounds(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
183 desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
186 /// Elaborated version of the predicates from `explicit_item_bounds`.
192 /// type MyAType: Eq + ?Sized;
196 /// `explicit_item_bounds` returns `[<Self as MyTrait>::MyAType: Eq]`,
197 /// and `item_bounds` returns
200 /// <Self as Trait>::MyAType: Eq,
201 /// <Self as Trait>::MyAType: PartialEq<<Self as Trait>::MyAType>
205 /// Bounds from the parent (e.g. with nested impl trait) are not included.
206 query item_bounds(key: DefId) -> &'tcx ty::List<ty::Predicate<'tcx>> {
207 desc { |tcx| "elaborating item bounds for `{}`", tcx.def_path_str(key) }
210 query native_libraries(_: CrateNum) -> Lrc<Vec<NativeLib>> {
211 desc { "looking up the native libraries of a linked crate" }
214 query lint_levels(_: ()) -> LintLevelMap {
215 storage(ArenaCacheSelector<'tcx>)
217 desc { "computing the lint levels for items in this crate" }
220 query parent_module_from_def_id(key: LocalDefId) -> LocalDefId {
222 desc { |tcx| "parent module of `{}`", tcx.def_path_str(key.to_def_id()) }
225 query expn_that_defined(key: DefId) -> rustc_span::ExpnId {
226 // This query reads from untracked data in definitions.
228 desc { |tcx| "expansion that defined `{}`", tcx.def_path_str(key) }
231 query is_panic_runtime(_: CrateNum) -> bool {
233 desc { "checking if the crate is_panic_runtime" }
236 /// Fetch the THIR for a given body. If typeck for that body failed, returns an empty `Thir`.
237 query thir_body(key: ty::WithOptConstParam<LocalDefId>) -> (&'tcx Steal<thir::Thir<'tcx>>, thir::ExprId) {
238 // Perf tests revealed that hashing THIR is inefficient (see #85729).
240 desc { |tcx| "building THIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
243 /// Create a THIR tree for debugging.
244 query thir_tree(key: ty::WithOptConstParam<LocalDefId>) -> String {
246 desc { |tcx| "constructing THIR tree for `{}`", tcx.def_path_str(key.did.to_def_id()) }
249 /// Set of all the `DefId`s in this crate that have MIR associated with
250 /// them. This includes all the body owners, but also things like struct
252 query mir_keys(_: ()) -> FxHashSet<LocalDefId> {
253 storage(ArenaCacheSelector<'tcx>)
254 desc { "getting a list of all mir_keys" }
257 /// Maps DefId's that have an associated `mir::Body` to the result
258 /// of the MIR const-checking pass. This is the set of qualifs in
259 /// the final value of a `const`.
260 query mir_const_qualif(key: DefId) -> mir::ConstQualifs {
261 desc { |tcx| "const checking `{}`", tcx.def_path_str(key) }
262 cache_on_disk_if { key.is_local() }
264 query mir_const_qualif_const_arg(
265 key: (LocalDefId, DefId)
266 ) -> mir::ConstQualifs {
268 |tcx| "const checking the const argument `{}`",
269 tcx.def_path_str(key.0.to_def_id())
273 /// Fetch the MIR for a given `DefId` right after it's built - this includes
274 /// unreachable code.
275 query mir_built(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
276 desc { |tcx| "building MIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
279 /// Fetch the MIR for a given `DefId` up till the point where it is
280 /// ready for const qualification.
282 /// See the README for the `mir` module for details.
283 query mir_const(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
285 |tcx| "processing MIR for {}`{}`",
286 if key.const_param_did.is_some() { "the const argument " } else { "" },
287 tcx.def_path_str(key.did.to_def_id()),
292 /// Try to build an abstract representation of the given constant.
293 query thir_abstract_const(
295 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
297 |tcx| "building an abstract representation for {}", tcx.def_path_str(key),
300 /// Try to build an abstract representation of the given constant.
301 query thir_abstract_const_of_const_arg(
302 key: (LocalDefId, DefId)
303 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
306 "building an abstract representation for the const argument {}",
307 tcx.def_path_str(key.0.to_def_id()),
311 query try_unify_abstract_consts(key: (
312 ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
315 |tcx| "trying to unify the generic constants {} and {}",
316 tcx.def_path_str(key.0.def.did), tcx.def_path_str(key.1.def.did)
320 query mir_drops_elaborated_and_const_checked(
321 key: ty::WithOptConstParam<LocalDefId>
322 ) -> &'tcx Steal<mir::Body<'tcx>> {
324 desc { |tcx| "elaborating drops for `{}`", tcx.def_path_str(key.did.to_def_id()) }
329 ) -> &'tcx mir::Body<'tcx> {
330 desc { |tcx| "caching mir of `{}` for CTFE", tcx.def_path_str(key) }
331 cache_on_disk_if { key.is_local() }
334 query mir_for_ctfe_of_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::Body<'tcx> {
336 |tcx| "MIR for CTFE of the const argument `{}`",
337 tcx.def_path_str(key.0.to_def_id())
341 query mir_promoted(key: ty::WithOptConstParam<LocalDefId>) ->
343 &'tcx Steal<mir::Body<'tcx>>,
344 &'tcx Steal<IndexVec<mir::Promoted, mir::Body<'tcx>>>
348 |tcx| "processing {}`{}`",
349 if key.const_param_did.is_some() { "the const argument " } else { "" },
350 tcx.def_path_str(key.did.to_def_id()),
354 query symbols_for_closure_captures(
355 key: (LocalDefId, DefId)
356 ) -> Vec<rustc_span::Symbol> {
358 |tcx| "symbols for captures of closure `{}` in `{}`",
359 tcx.def_path_str(key.1),
360 tcx.def_path_str(key.0.to_def_id())
364 /// MIR after our optimization passes have run. This is MIR that is ready
365 /// for codegen. This is also the only query that can fetch non-local MIR, at present.
366 query optimized_mir(key: DefId) -> &'tcx mir::Body<'tcx> {
367 desc { |tcx| "optimizing MIR for `{}`", tcx.def_path_str(key) }
368 cache_on_disk_if { key.is_local() }
371 /// Returns coverage summary info for a function, after executing the `InstrumentCoverage`
372 /// MIR pass (assuming the -Zinstrument-coverage option is enabled).
373 query coverageinfo(key: ty::InstanceDef<'tcx>) -> mir::CoverageInfo {
374 desc { |tcx| "retrieving coverage info from MIR for `{}`", tcx.def_path_str(key.def_id()) }
375 storage(ArenaCacheSelector<'tcx>)
378 /// Returns the name of the file that contains the function body, if instrumented for coverage.
379 query covered_file_name(key: DefId) -> Option<Symbol> {
381 |tcx| "retrieving the covered file name, if instrumented, for `{}`",
382 tcx.def_path_str(key)
384 storage(ArenaCacheSelector<'tcx>)
385 cache_on_disk_if { key.is_local() }
388 /// Returns the `CodeRegions` for a function that has instrumented coverage, in case the
389 /// function was optimized out before codegen, and before being added to the Coverage Map.
390 query covered_code_regions(key: DefId) -> Vec<&'tcx mir::coverage::CodeRegion> {
392 |tcx| "retrieving the covered `CodeRegion`s, if instrumented, for `{}`",
393 tcx.def_path_str(key)
395 storage(ArenaCacheSelector<'tcx>)
396 cache_on_disk_if { key.is_local() }
399 /// The `DefId` is the `DefId` of the containing MIR body. Promoteds do not have their own
400 /// `DefId`. This function returns all promoteds in the specified body. The body references
401 /// promoteds by the `DefId` and the `mir::Promoted` index. This is necessary, because
402 /// after inlining a body may refer to promoteds from other bodies. In that case you still
403 /// need to use the `DefId` of the original body.
404 query promoted_mir(key: DefId) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
405 desc { |tcx| "optimizing promoted MIR for `{}`", tcx.def_path_str(key) }
406 cache_on_disk_if { key.is_local() }
408 query promoted_mir_of_const_arg(
409 key: (LocalDefId, DefId)
410 ) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
412 |tcx| "optimizing promoted MIR for the const argument `{}`",
413 tcx.def_path_str(key.0.to_def_id()),
417 /// Erases regions from `ty` to yield a new type.
418 /// Normally you would just use `tcx.erase_regions(value)`,
419 /// however, which uses this query as a kind of cache.
420 query erase_regions_ty(ty: Ty<'tcx>) -> Ty<'tcx> {
421 // This query is not expected to have input -- as a result, it
422 // is not a good candidates for "replay" because it is essentially a
423 // pure function of its input (and hence the expectation is that
424 // no caller would be green **apart** from just these
425 // queries). Making it anonymous avoids hashing the result, which
426 // may save a bit of time.
428 desc { "erasing regions from `{:?}`", ty }
431 query wasm_import_module_map(_: CrateNum) -> FxHashMap<DefId, String> {
432 storage(ArenaCacheSelector<'tcx>)
433 desc { "wasm import module map" }
436 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
437 /// predicates (where-clauses) directly defined on it. This is
438 /// equal to the `explicit_predicates_of` predicates plus the
439 /// `inferred_outlives_of` predicates.
440 query predicates_defined_on(key: DefId) -> ty::GenericPredicates<'tcx> {
441 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
444 /// Returns everything that looks like a predicate written explicitly
445 /// by the user on a trait item.
447 /// Traits are unusual, because predicates on associated types are
448 /// converted into bounds on that type for backwards compatibility:
450 /// trait X where Self::U: Copy { type U; }
454 /// trait X { type U: Copy; }
456 /// `explicit_predicates_of` and `explicit_item_bounds` will then take
457 /// the appropriate subsets of the predicates here.
458 query trait_explicit_predicates_and_bounds(key: LocalDefId) -> ty::GenericPredicates<'tcx> {
459 desc { |tcx| "computing explicit predicates of trait `{}`", tcx.def_path_str(key.to_def_id()) }
462 /// Returns the predicates written explicitly by the user.
463 query explicit_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
464 desc { |tcx| "computing explicit predicates of `{}`", tcx.def_path_str(key) }
467 /// Returns the inferred outlives predicates (e.g., for `struct
468 /// Foo<'a, T> { x: &'a T }`, this would return `T: 'a`).
469 query inferred_outlives_of(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
470 desc { |tcx| "computing inferred outlives predicates of `{}`", tcx.def_path_str(key) }
473 /// Maps from the `DefId` of a trait to the list of
474 /// super-predicates. This is a subset of the full list of
475 /// predicates. We store these in a separate map because we must
476 /// evaluate them even during type conversion, often before the
477 /// full predicates are available (note that supertraits have
478 /// additional acyclicity requirements).
479 query super_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
480 desc { |tcx| "computing the super predicates of `{}`", tcx.def_path_str(key) }
483 /// The `Option<Ident>` is the name of an associated type. If it is `None`, then this query
484 /// returns the full set of predicates. If `Some<Ident>`, then the query returns only the
485 /// subset of super-predicates that reference traits that define the given associated type.
486 /// This is used to avoid cycles in resolving types like `T::Item`.
487 query super_predicates_that_define_assoc_type(key: (DefId, Option<rustc_span::symbol::Ident>)) -> ty::GenericPredicates<'tcx> {
488 desc { |tcx| "computing the super traits of `{}`{}",
489 tcx.def_path_str(key.0),
490 if let Some(assoc_name) = key.1 { format!(" with associated type name `{}`", assoc_name) } else { "".to_string() },
494 /// To avoid cycles within the predicates of a single item we compute
495 /// per-type-parameter predicates for resolving `T::AssocTy`.
496 query type_param_predicates(key: (DefId, LocalDefId, rustc_span::symbol::Ident)) -> ty::GenericPredicates<'tcx> {
497 desc { |tcx| "computing the bounds for type parameter `{}`", {
498 let id = tcx.hir().local_def_id_to_hir_id(key.1);
499 tcx.hir().ty_param_name(id)
503 query trait_def(key: DefId) -> ty::TraitDef {
504 desc { |tcx| "computing trait definition for `{}`", tcx.def_path_str(key) }
505 storage(ArenaCacheSelector<'tcx>)
507 query adt_def(key: DefId) -> &'tcx ty::AdtDef {
508 desc { |tcx| "computing ADT definition for `{}`", tcx.def_path_str(key) }
510 query adt_destructor(key: DefId) -> Option<ty::Destructor> {
511 desc { |tcx| "computing `Drop` impl for `{}`", tcx.def_path_str(key) }
514 // The cycle error here should be reported as an error by `check_representable`.
515 // We consider the type as Sized in the meanwhile to avoid
516 // further errors (done in impl Value for AdtSizedConstraint).
517 // Use `cycle_delay_bug` to delay the cycle error here to be emitted later
518 // in case we accidentally otherwise don't emit an error.
519 query adt_sized_constraint(
521 ) -> AdtSizedConstraint<'tcx> {
522 desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
526 query adt_dtorck_constraint(
528 ) -> Result<DtorckConstraint<'tcx>, NoSolution> {
529 desc { |tcx| "computing drop-check constraints for `{}`", tcx.def_path_str(key) }
532 /// Returns `true` if this is a const fn, use the `is_const_fn` to know whether your crate
533 /// actually sees it as const fn (e.g., the const-fn-ness might be unstable and you might
534 /// not have the feature gate active).
536 /// **Do not call this function manually.** It is only meant to cache the base data for the
537 /// `is_const_fn` function.
538 query is_const_fn_raw(key: DefId) -> bool {
539 desc { |tcx| "checking if item is const fn: `{}`", tcx.def_path_str(key) }
542 query asyncness(key: DefId) -> hir::IsAsync {
543 desc { |tcx| "checking if the function is async: `{}`", tcx.def_path_str(key) }
546 /// Returns `true` if calls to the function may be promoted.
548 /// This is either because the function is e.g., a tuple-struct or tuple-variant
549 /// constructor, or because it has the `#[rustc_promotable]` attribute. The attribute should
550 /// be removed in the future in favour of some form of check which figures out whether the
551 /// function does not inspect the bits of any of its arguments (so is essentially just a
552 /// constructor function).
553 query is_promotable_const_fn(key: DefId) -> bool {
554 desc { |tcx| "checking if item is promotable: `{}`", tcx.def_path_str(key) }
557 /// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
558 query is_foreign_item(key: DefId) -> bool {
559 desc { |tcx| "checking if `{}` is a foreign item", tcx.def_path_str(key) }
562 /// Returns `Some(mutability)` if the node pointed to by `def_id` is a static item.
563 query static_mutability(def_id: DefId) -> Option<hir::Mutability> {
564 desc { |tcx| "looking up static mutability of `{}`", tcx.def_path_str(def_id) }
567 /// Returns `Some(generator_kind)` if the node pointed to by `def_id` is a generator.
568 query generator_kind(def_id: DefId) -> Option<hir::GeneratorKind> {
569 desc { |tcx| "looking up generator kind of `{}`", tcx.def_path_str(def_id) }
572 /// Gets a map with the variance of every item; use `item_variance` instead.
573 query crate_variances(_: ()) -> ty::CrateVariancesMap<'tcx> {
574 storage(ArenaCacheSelector<'tcx>)
575 desc { "computing the variances for items in this crate" }
578 /// Maps from the `DefId` of a type or region parameter to its (inferred) variance.
579 query variances_of(def_id: DefId) -> &'tcx [ty::Variance] {
580 desc { |tcx| "computing the variances of `{}`", tcx.def_path_str(def_id) }
583 /// Maps from thee `DefId` of a type to its (inferred) outlives.
584 query inferred_outlives_crate(_: ()) -> ty::CratePredicatesMap<'tcx> {
585 storage(ArenaCacheSelector<'tcx>)
586 desc { "computing the inferred outlives predicates for items in this crate" }
589 /// Maps from an impl/trait `DefId` to a list of the `DefId`s of its items.
590 query associated_item_def_ids(key: DefId) -> &'tcx [DefId] {
591 desc { |tcx| "collecting associated items of `{}`", tcx.def_path_str(key) }
594 /// Maps from a trait item to the trait item "descriptor".
595 query associated_item(key: DefId) -> ty::AssocItem {
596 desc { |tcx| "computing associated item data for `{}`", tcx.def_path_str(key) }
597 storage(ArenaCacheSelector<'tcx>)
600 /// Collects the associated items defined on a trait or impl.
601 query associated_items(key: DefId) -> ty::AssocItems<'tcx> {
602 storage(ArenaCacheSelector<'tcx>)
603 desc { |tcx| "collecting associated items of {}", tcx.def_path_str(key) }
606 /// Given an `impl_id`, return the trait it implements.
607 /// Return `None` if this is an inherent impl.
608 query impl_trait_ref(impl_id: DefId) -> Option<ty::TraitRef<'tcx>> {
609 desc { |tcx| "computing trait implemented by `{}`", tcx.def_path_str(impl_id) }
611 query impl_polarity(impl_id: DefId) -> ty::ImplPolarity {
612 desc { |tcx| "computing implementation polarity of `{}`", tcx.def_path_str(impl_id) }
615 query issue33140_self_ty(key: DefId) -> Option<ty::Ty<'tcx>> {
616 desc { |tcx| "computing Self type wrt issue #33140 `{}`", tcx.def_path_str(key) }
619 /// Maps a `DefId` of a type to a list of its inherent impls.
620 /// Contains implementations of methods that are inherent to a type.
621 /// Methods in these implementations don't need to be exported.
622 query inherent_impls(key: DefId) -> &'tcx [DefId] {
623 desc { |tcx| "collecting inherent impls for `{}`", tcx.def_path_str(key) }
627 /// The result of unsafety-checking this `LocalDefId`.
628 query unsafety_check_result(key: LocalDefId) -> &'tcx mir::UnsafetyCheckResult {
629 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
630 cache_on_disk_if { true }
632 query unsafety_check_result_for_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::UnsafetyCheckResult {
634 |tcx| "unsafety-checking the const argument `{}`",
635 tcx.def_path_str(key.0.to_def_id())
639 /// Unsafety-check this `LocalDefId` with THIR unsafeck. This should be
640 /// used with `-Zthir-unsafeck`.
641 query thir_check_unsafety(key: LocalDefId) {
642 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
643 cache_on_disk_if { true }
645 query thir_check_unsafety_for_const_arg(key: (LocalDefId, DefId)) {
647 |tcx| "unsafety-checking the const argument `{}`",
648 tcx.def_path_str(key.0.to_def_id())
652 /// HACK: when evaluated, this reports an "unsafe derive on repr(packed)" error.
654 /// Unsafety checking is executed for each method separately, but we only want
655 /// to emit this error once per derive. As there are some impls with multiple
656 /// methods, we use a query for deduplication.
657 query unsafe_derive_on_repr_packed(key: LocalDefId) -> () {
658 desc { |tcx| "processing `{}`", tcx.def_path_str(key.to_def_id()) }
661 /// The signature of functions.
662 query fn_sig(key: DefId) -> ty::PolyFnSig<'tcx> {
663 desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }
666 query lint_mod(key: LocalDefId) -> () {
667 desc { |tcx| "linting {}", describe_as_module(key, tcx) }
670 /// Checks the attributes in the module.
671 query check_mod_attrs(key: LocalDefId) -> () {
672 desc { |tcx| "checking attributes in {}", describe_as_module(key, tcx) }
675 query check_mod_unstable_api_usage(key: LocalDefId) -> () {
676 desc { |tcx| "checking for unstable API usage in {}", describe_as_module(key, tcx) }
679 /// Checks the const bodies in the module for illegal operations (e.g. `if` or `loop`).
680 query check_mod_const_bodies(key: LocalDefId) -> () {
681 desc { |tcx| "checking consts in {}", describe_as_module(key, tcx) }
684 /// Checks the loops in the module.
685 query check_mod_loops(key: LocalDefId) -> () {
686 desc { |tcx| "checking loops in {}", describe_as_module(key, tcx) }
689 query check_mod_naked_functions(key: LocalDefId) -> () {
690 desc { |tcx| "checking naked functions in {}", describe_as_module(key, tcx) }
693 query check_mod_item_types(key: LocalDefId) -> () {
694 desc { |tcx| "checking item types in {}", describe_as_module(key, tcx) }
697 query check_mod_privacy(key: LocalDefId) -> () {
698 desc { |tcx| "checking privacy in {}", describe_as_module(key, tcx) }
701 query check_mod_intrinsics(key: LocalDefId) -> () {
702 desc { |tcx| "checking intrinsics in {}", describe_as_module(key, tcx) }
705 query check_mod_liveness(key: LocalDefId) -> () {
706 desc { |tcx| "checking liveness of variables in {}", describe_as_module(key, tcx) }
709 query check_mod_impl_wf(key: LocalDefId) -> () {
710 desc { |tcx| "checking that impls are well-formed in {}", describe_as_module(key, tcx) }
713 query collect_mod_item_types(key: LocalDefId) -> () {
714 desc { |tcx| "collecting item types in {}", describe_as_module(key, tcx) }
717 /// Caches `CoerceUnsized` kinds for impls on custom types.
718 query coerce_unsized_info(key: DefId)
719 -> ty::adjustment::CoerceUnsizedInfo {
720 desc { |tcx| "computing CoerceUnsized info for `{}`", tcx.def_path_str(key) }
723 query typeck_item_bodies(_: ()) -> () {
724 desc { "type-checking all item bodies" }
727 query typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
728 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
729 cache_on_disk_if { true }
731 query typeck_const_arg(
732 key: (LocalDefId, DefId)
733 ) -> &'tcx ty::TypeckResults<'tcx> {
735 |tcx| "type-checking the const argument `{}`",
736 tcx.def_path_str(key.0.to_def_id()),
739 query diagnostic_only_typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
740 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
741 cache_on_disk_if { true }
742 load_cached(tcx, id) {
743 let typeck_results: Option<ty::TypeckResults<'tcx>> = tcx
744 .on_disk_cache().as_ref()
745 .and_then(|c| c.try_load_query_result(*tcx, id));
747 typeck_results.map(|x| &*tcx.arena.alloc(x))
751 query used_trait_imports(key: LocalDefId) -> &'tcx FxHashSet<LocalDefId> {
752 desc { |tcx| "used_trait_imports `{}`", tcx.def_path_str(key.to_def_id()) }
753 cache_on_disk_if { true }
756 query has_typeck_results(def_id: DefId) -> bool {
757 desc { |tcx| "checking whether `{}` has a body", tcx.def_path_str(def_id) }
760 query coherent_trait(def_id: DefId) -> () {
761 desc { |tcx| "coherence checking all impls of trait `{}`", tcx.def_path_str(def_id) }
764 /// Borrow-checks the function body. If this is a closure, returns
765 /// additional requirements that the closure's creator must verify.
766 query mir_borrowck(key: LocalDefId) -> &'tcx mir::BorrowCheckResult<'tcx> {
767 desc { |tcx| "borrow-checking `{}`", tcx.def_path_str(key.to_def_id()) }
768 cache_on_disk_if(tcx, opt_result) {
769 tcx.is_closure(key.to_def_id())
770 || opt_result.map_or(false, |r| !r.concrete_opaque_types.is_empty())
773 query mir_borrowck_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::BorrowCheckResult<'tcx> {
775 |tcx| "borrow-checking the const argument`{}`",
776 tcx.def_path_str(key.0.to_def_id())
780 /// Gets a complete map from all types to their inherent impls.
781 /// Not meant to be used directly outside of coherence.
782 query crate_inherent_impls(k: ()) -> CrateInherentImpls {
783 storage(ArenaCacheSelector<'tcx>)
785 desc { "all inherent impls defined in crate" }
788 /// Checks all types in the crate for overlap in their inherent impls. Reports errors.
789 /// Not meant to be used directly outside of coherence.
790 query crate_inherent_impls_overlap_check(_: ())
793 desc { "check for overlap between inherent impls defined in this crate" }
796 /// Check whether the function has any recursion that could cause the inliner to trigger
797 /// a cycle. Returns the call stack causing the cycle. The call stack does not contain the
798 /// current function, just all intermediate functions.
799 query mir_callgraph_reachable(key: (ty::Instance<'tcx>, LocalDefId)) -> bool {
802 "computing if `{}` (transitively) calls `{}`",
804 tcx.def_path_str(key.1.to_def_id()),
808 /// Obtain all the calls into other local functions
809 query mir_inliner_callees(key: ty::InstanceDef<'tcx>) -> &'tcx [(DefId, SubstsRef<'tcx>)] {
812 "computing all local function calls in `{}`",
813 tcx.def_path_str(key.def_id()),
817 /// Evaluates a constant and returns the computed allocation.
819 /// **Do not use this** directly, use the `tcx.eval_static_initializer` wrapper.
820 query eval_to_allocation_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
821 -> EvalToAllocationRawResult<'tcx> {
823 "const-evaluating + checking `{}`",
824 key.value.display(tcx)
826 cache_on_disk_if { true }
829 /// Evaluates const items or anonymous constants
830 /// (such as enum variant explicit discriminants or array lengths)
831 /// into a representation suitable for the type system and const generics.
833 /// **Do not use this** directly, use one of the following wrappers: `tcx.const_eval_poly`,
834 /// `tcx.const_eval_resolve`, `tcx.const_eval_instance`, or `tcx.const_eval_global_id`.
835 query eval_to_const_value_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
836 -> EvalToConstValueResult<'tcx> {
838 "simplifying constant for the type system `{}`",
839 key.value.display(tcx)
841 cache_on_disk_if { true }
844 /// Convert an evaluated constant to a type level constant or
845 /// return `None` if that is not possible.
846 query const_to_valtree(
847 key: ty::ParamEnvAnd<'tcx, ConstAlloc<'tcx>>
848 ) -> Option<ty::ValTree<'tcx>> {
849 desc { "destructure constant" }
852 /// Destructure a constant ADT or array into its variant index and its
854 query destructure_const(
855 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
856 ) -> mir::DestructuredConst<'tcx> {
857 desc { "destructure constant" }
860 /// Dereference a constant reference or raw pointer and turn the result into a constant
863 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
864 ) -> &'tcx ty::Const<'tcx> {
865 desc { "deref constant" }
868 query const_caller_location(key: (rustc_span::Symbol, u32, u32)) -> ConstValue<'tcx> {
869 desc { "get a &core::panic::Location referring to a span" }
873 key: LitToConstInput<'tcx>
874 ) -> Result<&'tcx ty::Const<'tcx>, LitToConstError> {
875 desc { "converting literal to const" }
878 query check_match(key: DefId) {
879 desc { |tcx| "match-checking `{}`", tcx.def_path_str(key) }
880 cache_on_disk_if { key.is_local() }
883 /// Performs part of the privacy check and computes "access levels".
884 query privacy_access_levels(_: ()) -> &'tcx AccessLevels {
886 desc { "privacy access levels" }
888 query check_private_in_public(_: ()) -> () {
890 desc { "checking for private elements in public interfaces" }
893 query reachable_set(_: ()) -> FxHashSet<LocalDefId> {
894 storage(ArenaCacheSelector<'tcx>)
895 desc { "reachability" }
898 /// Per-body `region::ScopeTree`. The `DefId` should be the owner `DefId` for the body;
899 /// in the case of closures, this will be redirected to the enclosing function.
900 query region_scope_tree(def_id: DefId) -> &'tcx region::ScopeTree {
901 desc { |tcx| "computing drop scopes for `{}`", tcx.def_path_str(def_id) }
904 query mir_shims(key: ty::InstanceDef<'tcx>) -> mir::Body<'tcx> {
905 storage(ArenaCacheSelector<'tcx>)
906 desc { |tcx| "generating MIR shim for `{}`", tcx.def_path_str(key.def_id()) }
909 /// The `symbol_name` query provides the symbol name for calling a
910 /// given instance from the local crate. In particular, it will also
911 /// look up the correct symbol name of instances from upstream crates.
912 query symbol_name(key: ty::Instance<'tcx>) -> ty::SymbolName<'tcx> {
913 desc { "computing the symbol for `{}`", key }
914 cache_on_disk_if { true }
917 query opt_def_kind(def_id: DefId) -> Option<DefKind> {
918 desc { |tcx| "looking up definition kind of `{}`", tcx.def_path_str(def_id) }
921 query def_span(def_id: DefId) -> Span {
922 desc { |tcx| "looking up span for `{}`", tcx.def_path_str(def_id) }
925 query def_ident_span(def_id: DefId) -> Option<Span> {
926 desc { |tcx| "looking up span for `{}`'s identifier", tcx.def_path_str(def_id) }
929 query lookup_stability(def_id: DefId) -> Option<&'tcx attr::Stability> {
930 desc { |tcx| "looking up stability of `{}`", tcx.def_path_str(def_id) }
933 query lookup_const_stability(def_id: DefId) -> Option<&'tcx attr::ConstStability> {
934 desc { |tcx| "looking up const stability of `{}`", tcx.def_path_str(def_id) }
937 query should_inherit_track_caller(def_id: DefId) -> bool {
938 desc { |tcx| "computing should_inherit_track_caller of `{}`", tcx.def_path_str(def_id) }
941 query lookup_deprecation_entry(def_id: DefId) -> Option<DeprecationEntry> {
942 desc { |tcx| "checking whether `{}` is deprecated", tcx.def_path_str(def_id) }
945 query item_attrs(def_id: DefId) -> &'tcx [ast::Attribute] {
946 desc { |tcx| "collecting attributes of `{}`", tcx.def_path_str(def_id) }
949 query codegen_fn_attrs(def_id: DefId) -> CodegenFnAttrs {
950 desc { |tcx| "computing codegen attributes of `{}`", tcx.def_path_str(def_id) }
951 storage(ArenaCacheSelector<'tcx>)
952 cache_on_disk_if { true }
955 query fn_arg_names(def_id: DefId) -> &'tcx [rustc_span::symbol::Ident] {
956 desc { |tcx| "looking up function parameter names for `{}`", tcx.def_path_str(def_id) }
958 /// Gets the rendered value of the specified constant or associated constant.
960 query rendered_const(def_id: DefId) -> String {
961 desc { |tcx| "rendering constant intializer of `{}`", tcx.def_path_str(def_id) }
963 query impl_parent(def_id: DefId) -> Option<DefId> {
964 desc { |tcx| "computing specialization parent impl of `{}`", tcx.def_path_str(def_id) }
967 /// Given an `associated_item`, find the trait it belongs to.
968 /// Return `None` if the `DefId` is not an associated item.
969 query trait_of_item(associated_item: DefId) -> Option<DefId> {
970 desc { |tcx| "finding trait defining `{}`", tcx.def_path_str(associated_item) }
973 query is_ctfe_mir_available(key: DefId) -> bool {
974 desc { |tcx| "checking if item has ctfe mir available: `{}`", tcx.def_path_str(key) }
976 query is_mir_available(key: DefId) -> bool {
977 desc { |tcx| "checking if item has mir available: `{}`", tcx.def_path_str(key) }
980 query own_existential_vtable_entries(
981 key: ty::PolyExistentialTraitRef<'tcx>
983 desc { |tcx| "finding all existential vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
986 query vtable_entries(key: ty::PolyTraitRef<'tcx>)
987 -> &'tcx [ty::VtblEntry<'tcx>] {
988 desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
991 query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::Ty<'tcx>, ty::Ty<'tcx>)) -> Option<usize> {
992 desc { |tcx| "finding the slot within vtable for trait object {} vtable ptr during trait upcasting coercion from {} vtable",
996 query vtable_allocation(key: (Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>)) -> mir::interpret::AllocId {
997 desc { |tcx| "vtable const allocation for <{} as {}>",
999 key.1.map(|trait_ref| format!("{}", trait_ref)).unwrap_or("_".to_owned())
1003 query codegen_fulfill_obligation(
1004 key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
1005 ) -> Result<ImplSource<'tcx, ()>, ErrorReported> {
1006 cache_on_disk_if { true }
1008 "checking if `{}` fulfills its obligations",
1009 tcx.def_path_str(key.1.def_id())
1013 /// Return all `impl` blocks in the current crate.
1015 /// To allow caching this between crates, you must pass in [`LOCAL_CRATE`] as the crate number.
1016 /// Passing in any other crate will cause an ICE.
1018 /// [`LOCAL_CRATE`]: rustc_hir::def_id::LOCAL_CRATE
1019 query all_local_trait_impls(_: ()) -> &'tcx BTreeMap<DefId, Vec<LocalDefId>> {
1020 desc { "local trait impls" }
1023 /// Given a trait `trait_id`, return all known `impl` blocks.
1024 query trait_impls_of(trait_id: DefId) -> ty::trait_def::TraitImpls {
1025 storage(ArenaCacheSelector<'tcx>)
1026 desc { |tcx| "trait impls of `{}`", tcx.def_path_str(trait_id) }
1029 query specialization_graph_of(trait_id: DefId) -> specialization_graph::Graph {
1030 storage(ArenaCacheSelector<'tcx>)
1031 desc { |tcx| "building specialization graph of trait `{}`", tcx.def_path_str(trait_id) }
1032 cache_on_disk_if { true }
1034 query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
1035 desc { |tcx| "determine object safety of trait `{}`", tcx.def_path_str(trait_id) }
1038 /// Gets the ParameterEnvironment for a given item; this environment
1039 /// will be in "user-facing" mode, meaning that it is suitable for
1040 /// type-checking etc, and it does not normalize specializable
1041 /// associated types. This is almost always what you want,
1042 /// unless you are doing MIR optimizations, in which case you
1043 /// might want to use `reveal_all()` method to change modes.
1044 query param_env(def_id: DefId) -> ty::ParamEnv<'tcx> {
1045 desc { |tcx| "computing normalized predicates of `{}`", tcx.def_path_str(def_id) }
1048 /// Like `param_env`, but returns the `ParamEnv` in `Reveal::All` mode.
1049 /// Prefer this over `tcx.param_env(def_id).with_reveal_all_normalized(tcx)`,
1050 /// as this method is more efficient.
1051 query param_env_reveal_all_normalized(def_id: DefId) -> ty::ParamEnv<'tcx> {
1052 desc { |tcx| "computing revealed normalized predicates of `{}`", tcx.def_path_str(def_id) }
1055 /// Trait selection queries. These are best used by invoking `ty.is_copy_modulo_regions()`,
1056 /// `ty.is_copy()`, etc, since that will prune the environment where possible.
1057 query is_copy_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1058 desc { "computing whether `{}` is `Copy`", env.value }
1060 /// Query backing `TyS::is_sized`.
1061 query is_sized_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1062 desc { "computing whether `{}` is `Sized`", env.value }
1064 /// Query backing `TyS::is_freeze`.
1065 query is_freeze_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1066 desc { "computing whether `{}` is freeze", env.value }
1068 /// Query backing `TyS::is_unpin`.
1069 query is_unpin_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1070 desc { "computing whether `{}` is `Unpin`", env.value }
1072 /// Query backing `TyS::needs_drop`.
1073 query needs_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1074 desc { "computing whether `{}` needs drop", env.value }
1076 /// Query backing `TyS::has_significant_drop_raw`.
1077 query has_significant_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1078 desc { "computing whether `{}` has a significant drop", env.value }
1081 /// Query backing `TyS::is_structural_eq_shallow`.
1083 /// This is only correct for ADTs. Call `is_structural_eq_shallow` to handle all types
1085 query has_structural_eq_impls(ty: Ty<'tcx>) -> bool {
1087 "computing whether `{:?}` implements `PartialStructuralEq` and `StructuralEq`",
1092 /// A list of types where the ADT requires drop if and only if any of
1093 /// those types require drop. If the ADT is known to always need drop
1094 /// then `Err(AlwaysRequiresDrop)` is returned.
1095 query adt_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1096 desc { |tcx| "computing when `{}` needs drop", tcx.def_path_str(def_id) }
1097 cache_on_disk_if { true }
1100 /// A list of types where the ADT requires drop if and only if any of those types
1101 /// has significant drop. A type marked with the attribute `rustc_insignificant_dtor`
1102 /// is considered to not be significant. A drop is significant if it is implemented
1103 /// by the user or does anything that will have any observable behavior (other than
1104 /// freeing up memory). If the ADT is known to have a significant destructor then
1105 /// `Err(AlwaysRequiresDrop)` is returned.
1106 query adt_significant_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1107 desc { |tcx| "computing when `{}` has a significant destructor", tcx.def_path_str(def_id) }
1108 cache_on_disk_if { false }
1111 /// Computes the layout of a type. Note that this implicitly
1112 /// executes in "reveal all" mode, and will normalize the input type.
1114 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1115 ) -> Result<ty::layout::TyAndLayout<'tcx>, ty::layout::LayoutError<'tcx>> {
1116 desc { "computing layout of `{}`", key.value }
1119 /// Compute a `FnAbi` suitable for indirect calls, i.e. to `fn` pointers.
1121 /// NB: this doesn't handle virtual calls - those should use `fn_abi_of_instance`
1122 /// instead, where the instance is an `InstanceDef::Virtual`.
1123 query fn_abi_of_fn_ptr(
1124 key: ty::ParamEnvAnd<'tcx, (ty::PolyFnSig<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1125 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1126 desc { "computing call ABI of `{}` function pointers", key.value.0 }
1129 /// Compute a `FnAbi` suitable for declaring/defining an `fn` instance, and for
1130 /// direct calls to an `fn`.
1132 /// NB: that includes virtual calls, which are represented by "direct calls"
1133 /// to an `InstanceDef::Virtual` instance (of `<dyn Trait as Trait>::fn`).
1134 query fn_abi_of_instance(
1135 key: ty::ParamEnvAnd<'tcx, (ty::Instance<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1136 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1137 desc { "computing call ABI of `{}`", key.value.0 }
1140 query dylib_dependency_formats(_: CrateNum)
1141 -> &'tcx [(CrateNum, LinkagePreference)] {
1142 desc { "dylib dependency formats of crate" }
1145 query dependency_formats(_: ()) -> Lrc<crate::middle::dependency_format::Dependencies> {
1146 desc { "get the linkage format of all dependencies" }
1149 query is_compiler_builtins(_: CrateNum) -> bool {
1151 desc { "checking if the crate is_compiler_builtins" }
1153 query has_global_allocator(_: CrateNum) -> bool {
1154 // This query depends on untracked global state in CStore
1157 desc { "checking if the crate has_global_allocator" }
1159 query has_panic_handler(_: CrateNum) -> bool {
1161 desc { "checking if the crate has_panic_handler" }
1163 query is_profiler_runtime(_: CrateNum) -> bool {
1165 desc { "query a crate is `#![profiler_runtime]`" }
1167 query panic_strategy(_: CrateNum) -> PanicStrategy {
1169 desc { "query a crate's configured panic strategy" }
1171 query panic_in_drop_strategy(_: CrateNum) -> PanicStrategy {
1173 desc { "query a crate's configured panic-in-drop strategy" }
1175 query is_no_builtins(_: CrateNum) -> bool {
1177 desc { "test whether a crate has `#![no_builtins]`" }
1179 query symbol_mangling_version(_: CrateNum) -> SymbolManglingVersion {
1181 desc { "query a crate's symbol mangling version" }
1184 query extern_crate(def_id: DefId) -> Option<&'tcx ExternCrate> {
1186 desc { "getting crate's ExternCrateData" }
1189 query specializes(_: (DefId, DefId)) -> bool {
1190 desc { "computing whether impls specialize one another" }
1192 query in_scope_traits_map(_: LocalDefId)
1193 -> Option<&'tcx FxHashMap<ItemLocalId, Box<[TraitCandidate]>>> {
1194 desc { "traits in scope at a block" }
1197 query module_exports(def_id: LocalDefId) -> Option<&'tcx [Export]> {
1198 desc { |tcx| "looking up items exported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1201 query impl_defaultness(def_id: DefId) -> hir::Defaultness {
1202 desc { |tcx| "looking up whether `{}` is a default impl", tcx.def_path_str(def_id) }
1205 query impl_constness(def_id: DefId) -> hir::Constness {
1206 desc { |tcx| "looking up whether `{}` is a const impl", tcx.def_path_str(def_id) }
1209 query check_item_well_formed(key: LocalDefId) -> () {
1210 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1212 query check_trait_item_well_formed(key: LocalDefId) -> () {
1213 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1215 query check_impl_item_well_formed(key: LocalDefId) -> () {
1216 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1219 // The `DefId`s of all non-generic functions and statics in the given crate
1220 // that can be reached from outside the crate.
1222 // We expect this items to be available for being linked to.
1224 // This query can also be called for `LOCAL_CRATE`. In this case it will
1225 // compute which items will be reachable to other crates, taking into account
1226 // the kind of crate that is currently compiled. Crates with only a
1227 // C interface have fewer reachable things.
1229 // Does not include external symbols that don't have a corresponding DefId,
1230 // like the compiler-generated `main` function and so on.
1231 query reachable_non_generics(_: CrateNum)
1232 -> DefIdMap<SymbolExportLevel> {
1233 storage(ArenaCacheSelector<'tcx>)
1234 desc { "looking up the exported symbols of a crate" }
1236 query is_reachable_non_generic(def_id: DefId) -> bool {
1237 desc { |tcx| "checking whether `{}` is an exported symbol", tcx.def_path_str(def_id) }
1239 query is_unreachable_local_definition(def_id: LocalDefId) -> bool {
1241 "checking whether `{}` is reachable from outside the crate",
1242 tcx.def_path_str(def_id.to_def_id()),
1246 /// The entire set of monomorphizations the local crate can safely link
1247 /// to because they are exported from upstream crates. Do not depend on
1248 /// this directly, as its value changes anytime a monomorphization gets
1249 /// added or removed in any upstream crate. Instead use the narrower
1250 /// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
1251 /// better, `Instance::upstream_monomorphization()`.
1252 query upstream_monomorphizations(_: ()) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1253 storage(ArenaCacheSelector<'tcx>)
1254 desc { "collecting available upstream monomorphizations" }
1257 /// Returns the set of upstream monomorphizations available for the
1258 /// generic function identified by the given `def_id`. The query makes
1259 /// sure to make a stable selection if the same monomorphization is
1260 /// available in multiple upstream crates.
1262 /// You likely want to call `Instance::upstream_monomorphization()`
1263 /// instead of invoking this query directly.
1264 query upstream_monomorphizations_for(def_id: DefId)
1265 -> Option<&'tcx FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1267 "collecting available upstream monomorphizations for `{}`",
1268 tcx.def_path_str(def_id),
1272 /// Returns the upstream crate that exports drop-glue for the given
1273 /// type (`substs` is expected to be a single-item list containing the
1274 /// type one wants drop-glue for).
1276 /// This is a subset of `upstream_monomorphizations_for` in order to
1277 /// increase dep-tracking granularity. Otherwise adding or removing any
1278 /// type with drop-glue in any upstream crate would invalidate all
1279 /// functions calling drop-glue of an upstream type.
1281 /// You likely want to call `Instance::upstream_monomorphization()`
1282 /// instead of invoking this query directly.
1284 /// NOTE: This query could easily be extended to also support other
1285 /// common functions that have are large set of monomorphizations
1286 /// (like `Clone::clone` for example).
1287 query upstream_drop_glue_for(substs: SubstsRef<'tcx>) -> Option<CrateNum> {
1288 desc { "available upstream drop-glue for `{:?}`", substs }
1291 query foreign_modules(_: CrateNum) -> Lrc<FxHashMap<DefId, ForeignModule>> {
1292 desc { "looking up the foreign modules of a linked crate" }
1295 /// Identifies the entry-point (e.g., the `main` function) for a given
1296 /// crate, returning `None` if there is no entry point (such as for library crates).
1297 query entry_fn(_: ()) -> Option<(DefId, EntryFnType)> {
1298 desc { "looking up the entry function of a crate" }
1300 query proc_macro_decls_static(_: ()) -> Option<LocalDefId> {
1301 desc { "looking up the derive registrar for a crate" }
1303 // The macro which defines `rustc_metadata::provide_extern` depends on this query's name.
1304 // Changing the name should cause a compiler error, but in case that changes, be aware.
1305 query crate_hash(_: CrateNum) -> Svh {
1307 desc { "looking up the hash a crate" }
1309 query crate_host_hash(_: CrateNum) -> Option<Svh> {
1311 desc { "looking up the hash of a host version of a crate" }
1313 query extra_filename(_: CrateNum) -> String {
1315 desc { "looking up the extra filename for a crate" }
1317 query crate_extern_paths(_: CrateNum) -> Vec<PathBuf> {
1319 desc { "looking up the paths for extern crates" }
1322 /// Given a crate and a trait, look up all impls of that trait in the crate.
1323 /// Return `(impl_id, self_ty)`.
1324 query implementations_of_trait(_: (CrateNum, DefId))
1325 -> &'tcx [(DefId, Option<ty::fast_reject::SimplifiedType>)] {
1326 desc { "looking up implementations of a trait in a crate" }
1329 /// Given a crate, look up all trait impls in that crate.
1330 /// Return `(impl_id, self_ty)`.
1331 query all_trait_implementations(_: CrateNum)
1332 -> &'tcx [(DefId, Option<ty::fast_reject::SimplifiedType>)] {
1333 desc { "looking up all (?) trait implementations" }
1336 query is_dllimport_foreign_item(def_id: DefId) -> bool {
1337 desc { |tcx| "is_dllimport_foreign_item({})", tcx.def_path_str(def_id) }
1339 query is_statically_included_foreign_item(def_id: DefId) -> bool {
1340 desc { |tcx| "is_statically_included_foreign_item({})", tcx.def_path_str(def_id) }
1342 query native_library_kind(def_id: DefId)
1343 -> Option<NativeLibKind> {
1344 desc { |tcx| "native_library_kind({})", tcx.def_path_str(def_id) }
1347 /// Does lifetime resolution, but does not descend into trait items. This
1348 /// should only be used for resolving lifetimes of on trait definitions,
1349 /// and is used to avoid cycles. Importantly, `resolve_lifetimes` still visits
1350 /// the same lifetimes and is responsible for diagnostics.
1351 /// See `rustc_resolve::late::lifetimes for details.
1352 query resolve_lifetimes_trait_definition(_: LocalDefId) -> ResolveLifetimes {
1353 storage(ArenaCacheSelector<'tcx>)
1354 desc { "resolving lifetimes for a trait definition" }
1356 /// Does lifetime resolution on items. Importantly, we can't resolve
1357 /// lifetimes directly on things like trait methods, because of trait params.
1358 /// See `rustc_resolve::late::lifetimes for details.
1359 query resolve_lifetimes(_: LocalDefId) -> ResolveLifetimes {
1360 storage(ArenaCacheSelector<'tcx>)
1361 desc { "resolving lifetimes" }
1363 query named_region_map(_: LocalDefId) ->
1364 Option<&'tcx FxHashMap<ItemLocalId, Region>> {
1365 desc { "looking up a named region" }
1367 query is_late_bound_map(_: LocalDefId) ->
1368 Option<(LocalDefId, &'tcx FxHashSet<ItemLocalId>)> {
1369 desc { "testing if a region is late bound" }
1371 /// For a given item (like a struct), gets the default lifetimes to be used
1372 /// for each parameter if a trait object were to be passed for that parameter.
1373 /// For example, for `struct Foo<'a, T, U>`, this would be `['static, 'static]`.
1374 /// For `struct Foo<'a, T: 'a, U>`, this would instead be `['a, 'static]`.
1375 query object_lifetime_defaults_map(_: LocalDefId)
1376 -> Option<Vec<ObjectLifetimeDefault>> {
1377 desc { "looking up lifetime defaults for a region on an item" }
1379 query late_bound_vars_map(_: LocalDefId)
1380 -> Option<&'tcx FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
1381 desc { "looking up late bound vars" }
1384 query lifetime_scope_map(_: LocalDefId) -> Option<FxHashMap<ItemLocalId, LifetimeScopeForPath>> {
1385 desc { "finds the lifetime scope for an HirId of a PathSegment" }
1388 query visibility(def_id: DefId) -> ty::Visibility {
1389 desc { |tcx| "computing visibility of `{}`", tcx.def_path_str(def_id) }
1392 /// Computes the set of modules from which this type is visibly uninhabited.
1393 /// To check whether a type is uninhabited at all (not just from a given module), you could
1394 /// check whether the forest is empty.
1395 query type_uninhabited_from(
1396 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1397 ) -> ty::inhabitedness::DefIdForest {
1398 desc { "computing the inhabitedness of `{:?}`", key }
1401 query dep_kind(_: CrateNum) -> CrateDepKind {
1403 desc { "fetching what a dependency looks like" }
1405 query crate_name(_: CrateNum) -> Symbol {
1407 desc { "fetching what a crate is named" }
1409 query item_children(def_id: DefId) -> &'tcx [Export] {
1410 desc { |tcx| "collecting child items of `{}`", tcx.def_path_str(def_id) }
1412 query extern_mod_stmt_cnum(def_id: LocalDefId) -> Option<CrateNum> {
1413 desc { |tcx| "computing crate imported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1416 query get_lib_features(_: ()) -> LibFeatures {
1417 storage(ArenaCacheSelector<'tcx>)
1419 desc { "calculating the lib features map" }
1421 query defined_lib_features(_: CrateNum)
1422 -> &'tcx [(Symbol, Option<Symbol>)] {
1423 desc { "calculating the lib features defined in a crate" }
1425 /// Returns the lang items defined in another crate by loading it from metadata.
1426 query get_lang_items(_: ()) -> LanguageItems {
1427 storage(ArenaCacheSelector<'tcx>)
1429 desc { "calculating the lang items map" }
1432 /// Returns all diagnostic items defined in all crates.
1433 query all_diagnostic_items(_: ()) -> rustc_hir::diagnostic_items::DiagnosticItems {
1434 storage(ArenaCacheSelector<'tcx>)
1436 desc { "calculating the diagnostic items map" }
1439 /// Returns the lang items defined in another crate by loading it from metadata.
1440 query defined_lang_items(_: CrateNum) -> &'tcx [(DefId, usize)] {
1441 desc { "calculating the lang items defined in a crate" }
1444 /// Returns the diagnostic items defined in a crate.
1445 query diagnostic_items(_: CrateNum) -> rustc_hir::diagnostic_items::DiagnosticItems {
1446 storage(ArenaCacheSelector<'tcx>)
1447 desc { "calculating the diagnostic items map in a crate" }
1450 query missing_lang_items(_: CrateNum) -> &'tcx [LangItem] {
1451 desc { "calculating the missing lang items in a crate" }
1453 query visible_parent_map(_: ()) -> DefIdMap<DefId> {
1454 storage(ArenaCacheSelector<'tcx>)
1455 desc { "calculating the visible parent map" }
1457 query trimmed_def_paths(_: ()) -> FxHashMap<DefId, Symbol> {
1458 storage(ArenaCacheSelector<'tcx>)
1459 desc { "calculating trimmed def paths" }
1461 query missing_extern_crate_item(_: CrateNum) -> bool {
1463 desc { "seeing if we're missing an `extern crate` item for this crate" }
1465 query used_crate_source(_: CrateNum) -> Lrc<CrateSource> {
1467 desc { "looking at the source for a crate" }
1469 query postorder_cnums(_: ()) -> &'tcx [CrateNum] {
1471 desc { "generating a postorder list of CrateNums" }
1473 /// Returns whether or not the crate with CrateNum 'cnum'
1474 /// is marked as a private dependency
1475 query is_private_dep(c: CrateNum) -> bool {
1477 desc { "check whether crate {} is a private dependency", c }
1479 query allocator_kind(_: ()) -> Option<AllocatorKind> {
1481 desc { "allocator kind for the current crate" }
1484 query upvars_mentioned(def_id: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
1485 desc { |tcx| "collecting upvars mentioned in `{}`", tcx.def_path_str(def_id) }
1488 query maybe_unused_trait_import(def_id: LocalDefId) -> bool {
1489 desc { |tcx| "maybe_unused_trait_import for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1491 query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
1492 desc { "looking up all possibly unused extern crates" }
1494 query names_imported_by_glob_use(def_id: LocalDefId) -> &'tcx FxHashSet<Symbol> {
1495 desc { |tcx| "names_imported_by_glob_use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1498 query stability_index(_: ()) -> stability::Index<'tcx> {
1499 storage(ArenaCacheSelector<'tcx>)
1501 desc { "calculating the stability index for the local crate" }
1503 query crates(_: ()) -> &'tcx [CrateNum] {
1505 desc { "fetching all foreign CrateNum instances" }
1508 /// A vector of every trait accessible in the whole crate
1509 /// (i.e., including those from subcrates). This is used only for
1510 /// error reporting.
1511 query all_traits(_: ()) -> &'tcx [DefId] {
1512 desc { "fetching all foreign and local traits" }
1515 /// The list of symbols exported from the given crate.
1517 /// - All names contained in `exported_symbols(cnum)` are guaranteed to
1518 /// correspond to a publicly visible symbol in `cnum` machine code.
1519 /// - The `exported_symbols` sets of different crates do not intersect.
1520 query exported_symbols(_: CrateNum)
1521 -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1522 desc { "exported_symbols" }
1525 query collect_and_partition_mono_items(_: ()) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
1527 desc { "collect_and_partition_mono_items" }
1529 query is_codegened_item(def_id: DefId) -> bool {
1530 desc { |tcx| "determining whether `{}` needs codegen", tcx.def_path_str(def_id) }
1533 /// All items participating in code generation together with items inlined into them.
1534 query codegened_and_inlined_items(_: ()) -> &'tcx DefIdSet {
1536 desc { "codegened_and_inlined_items" }
1539 query codegen_unit(_: Symbol) -> &'tcx CodegenUnit<'tcx> {
1540 desc { "codegen_unit" }
1542 query unused_generic_params(key: ty::InstanceDef<'tcx>) -> FiniteBitSet<u32> {
1543 cache_on_disk_if { key.def_id().is_local() }
1545 |tcx| "determining which generic parameters are unused by `{}`",
1546 tcx.def_path_str(key.def_id())
1549 query backend_optimization_level(_: ()) -> OptLevel {
1550 desc { "optimization level used by backend" }
1553 query output_filenames(_: ()) -> Arc<OutputFilenames> {
1555 desc { "output_filenames" }
1558 /// Do not call this query directly: invoke `normalize` instead.
1559 query normalize_projection_ty(
1560 goal: CanonicalProjectionGoal<'tcx>
1562 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, NormalizationResult<'tcx>>>,
1565 desc { "normalizing `{:?}`", goal }
1568 /// Do not call this query directly: invoke `normalize_erasing_regions` instead.
1569 query normalize_generic_arg_after_erasing_regions(
1570 goal: ParamEnvAnd<'tcx, GenericArg<'tcx>>
1571 ) -> GenericArg<'tcx> {
1572 desc { "normalizing `{}`", goal.value }
1575 /// Do not call this query directly: invoke `normalize_erasing_regions` instead.
1576 query normalize_mir_const_after_erasing_regions(
1577 goal: ParamEnvAnd<'tcx, mir::ConstantKind<'tcx>>
1578 ) -> mir::ConstantKind<'tcx> {
1579 desc { "normalizing `{}`", goal.value }
1582 query implied_outlives_bounds(
1583 goal: CanonicalTyGoal<'tcx>
1585 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Vec<OutlivesBound<'tcx>>>>,
1588 desc { "computing implied outlives bounds for `{:?}`", goal }
1591 /// Do not call this query directly: invoke `infcx.at().dropck_outlives()` instead.
1592 query dropck_outlives(
1593 goal: CanonicalTyGoal<'tcx>
1595 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>,
1598 desc { "computing dropck types for `{:?}`", goal }
1601 /// Do not call this query directly: invoke `infcx.predicate_may_hold()` or
1602 /// `infcx.predicate_must_hold()` instead.
1603 query evaluate_obligation(
1604 goal: CanonicalPredicateGoal<'tcx>
1605 ) -> Result<traits::EvaluationResult, traits::OverflowError> {
1606 desc { "evaluating trait selection obligation `{}`", goal.value.value }
1609 query evaluate_goal(
1610 goal: traits::CanonicalChalkEnvironmentAndGoal<'tcx>
1612 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1615 desc { "evaluating trait selection obligation `{}`", goal.value }
1618 /// Do not call this query directly: part of the `Eq` type-op
1619 query type_op_ascribe_user_type(
1620 goal: CanonicalTypeOpAscribeUserTypeGoal<'tcx>
1622 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1625 desc { "evaluating `type_op_ascribe_user_type` `{:?}`", goal }
1628 /// Do not call this query directly: part of the `Eq` type-op
1630 goal: CanonicalTypeOpEqGoal<'tcx>
1632 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1635 desc { "evaluating `type_op_eq` `{:?}`", goal }
1638 /// Do not call this query directly: part of the `Subtype` type-op
1639 query type_op_subtype(
1640 goal: CanonicalTypeOpSubtypeGoal<'tcx>
1642 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1645 desc { "evaluating `type_op_subtype` `{:?}`", goal }
1648 /// Do not call this query directly: part of the `ProvePredicate` type-op
1649 query type_op_prove_predicate(
1650 goal: CanonicalTypeOpProvePredicateGoal<'tcx>
1652 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1655 desc { "evaluating `type_op_prove_predicate` `{:?}`", goal }
1658 /// Do not call this query directly: part of the `Normalize` type-op
1659 query type_op_normalize_ty(
1660 goal: CanonicalTypeOpNormalizeGoal<'tcx, Ty<'tcx>>
1662 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Ty<'tcx>>>,
1665 desc { "normalizing `{:?}`", goal }
1668 /// Do not call this query directly: part of the `Normalize` type-op
1669 query type_op_normalize_predicate(
1670 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::Predicate<'tcx>>
1672 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::Predicate<'tcx>>>,
1675 desc { "normalizing `{:?}`", goal }
1678 /// Do not call this query directly: part of the `Normalize` type-op
1679 query type_op_normalize_poly_fn_sig(
1680 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::PolyFnSig<'tcx>>
1682 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::PolyFnSig<'tcx>>>,
1685 desc { "normalizing `{:?}`", goal }
1688 /// Do not call this query directly: part of the `Normalize` type-op
1689 query type_op_normalize_fn_sig(
1690 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::FnSig<'tcx>>
1692 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::FnSig<'tcx>>>,
1695 desc { "normalizing `{:?}`", goal }
1698 query subst_and_check_impossible_predicates(key: (DefId, SubstsRef<'tcx>)) -> bool {
1700 "impossible substituted predicates:`{}`",
1701 tcx.def_path_str(key.0)
1705 query method_autoderef_steps(
1706 goal: CanonicalTyGoal<'tcx>
1707 ) -> MethodAutoderefStepsResult<'tcx> {
1708 desc { "computing autoderef types for `{:?}`", goal }
1711 query supported_target_features(_: CrateNum) -> FxHashMap<String, Option<Symbol>> {
1712 storage(ArenaCacheSelector<'tcx>)
1714 desc { "looking up supported target features" }
1717 /// Get an estimate of the size of an InstanceDef based on its MIR for CGU partitioning.
1718 query instance_def_size_estimate(def: ty::InstanceDef<'tcx>)
1720 desc { |tcx| "estimating size for `{}`", tcx.def_path_str(def.def_id()) }
1723 query features_query(_: ()) -> &'tcx rustc_feature::Features {
1725 desc { "looking up enabled feature gates" }
1728 /// Attempt to resolve the given `DefId` to an `Instance`, for the
1729 /// given generics args (`SubstsRef`), returning one of:
1730 /// * `Ok(Some(instance))` on success
1731 /// * `Ok(None)` when the `SubstsRef` are still too generic,
1732 /// and therefore don't allow finding the final `Instance`
1733 /// * `Err(ErrorReported)` when the `Instance` resolution process
1734 /// couldn't complete due to errors elsewhere - this is distinct
1735 /// from `Ok(None)` to avoid misleading diagnostics when an error
1736 /// has already been/will be emitted, for the original cause
1737 query resolve_instance(
1738 key: ty::ParamEnvAnd<'tcx, (DefId, SubstsRef<'tcx>)>
1739 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1740 desc { "resolving instance `{}`", ty::Instance::new(key.value.0, key.value.1) }
1743 query resolve_instance_of_const_arg(
1744 key: ty::ParamEnvAnd<'tcx, (LocalDefId, DefId, SubstsRef<'tcx>)>
1745 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1747 "resolving instance of the const argument `{}`",
1748 ty::Instance::new(key.value.0.to_def_id(), key.value.2),
1752 query normalize_opaque_types(key: &'tcx ty::List<ty::Predicate<'tcx>>) -> &'tcx ty::List<ty::Predicate<'tcx>> {
1753 desc { "normalizing opaque types in {:?}", key }
1756 /// Checks whether a type is definitely uninhabited. This is
1757 /// conservative: for some types that are uninhabited we return `false`,
1758 /// but we only return `true` for types that are definitely uninhabited.
1759 /// `ty.conservative_is_privately_uninhabited` implies that any value of type `ty`
1760 /// will be `Abi::Uninhabited`. (Note that uninhabited types may have nonzero
1761 /// size, to account for partial initialisation. See #49298 for details.)
1762 query conservative_is_privately_uninhabited(key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1763 desc { "conservatively checking if {:?} is privately uninhabited", key }
1766 query limits(key: ()) -> Limits {
1767 desc { "looking up limits" }
1770 /// Performs an HIR-based well-formed check on the item with the given `HirId`. If
1771 /// we get an `Unimplemented` error that matches the provided `Predicate`, return
1772 /// the cause of the newly created obligation.
1774 /// This is only used by error-reporting code to get a better cause (in particular, a better
1775 /// span) for an *existing* error. Therefore, it is best-effort, and may never handle
1776 /// all of the cases that the normal `ty::Ty`-based wfcheck does. This is fine,
1777 /// because the `ty::Ty`-based wfcheck is always run.
1778 query diagnostic_hir_wf_check(key: (ty::Predicate<'tcx>, traits::WellFormedLoc)) -> Option<traits::ObligationCause<'tcx>> {
1781 desc { "performing HIR wf-checking for predicate {:?} at item {:?}", key.0, key.1 }