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) }
110 separate_provide_extern
113 query default_anon_const_substs(key: DefId) -> SubstsRef<'tcx> {
114 desc { |tcx| "computing the default generic arguments for `{}`", tcx.def_path_str(key) }
117 /// Records the type of every item.
118 query type_of(key: DefId) -> Ty<'tcx> {
122 use rustc_hir::def::DefKind;
123 match tcx.def_kind(key) {
124 DefKind::TyAlias => "expanding type alias",
125 DefKind::TraitAlias => "expanding trait alias",
126 _ => "computing type of",
129 path = tcx.def_path_str(key),
131 cache_on_disk_if { key.is_local() }
132 separate_provide_extern
135 query analysis(key: ()) -> Result<(), ErrorReported> {
137 desc { "running analysis passes on this crate" }
140 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to its
141 /// associated generics.
142 query generics_of(key: DefId) -> ty::Generics {
143 desc { |tcx| "computing generics of `{}`", tcx.def_path_str(key) }
144 storage(ArenaCacheSelector<'tcx>)
145 cache_on_disk_if { key.is_local() }
146 separate_provide_extern
149 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
150 /// predicates (where-clauses) that must be proven true in order
151 /// to reference it. This is almost always the "predicates query"
154 /// `predicates_of` builds on `predicates_defined_on` -- in fact,
155 /// it is almost always the same as that query, except for the
156 /// case of traits. For traits, `predicates_of` contains
157 /// an additional `Self: Trait<...>` predicate that users don't
158 /// actually write. This reflects the fact that to invoke the
159 /// trait (e.g., via `Default::default`) you must supply types
160 /// that actually implement the trait. (However, this extra
161 /// predicate gets in the way of some checks, which are intended
162 /// to operate over only the actual where-clauses written by the
164 query predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
165 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
166 cache_on_disk_if { key.is_local() }
169 /// Returns the list of bounds that can be used for
170 /// `SelectionCandidate::ProjectionCandidate(_)` and
171 /// `ProjectionTyCandidate::TraitDef`.
172 /// Specifically this is the bounds written on the trait's type
173 /// definition, or those after the `impl` keyword
175 /// ```ignore (incomplete)
176 /// type X: Bound + 'lt
178 /// impl Debug + Display
179 /// // ^^^^^^^^^^^^^^^
182 /// `key` is the `DefId` of the associated type or opaque type.
184 /// Bounds from the parent (e.g. with nested impl trait) are not included.
185 query explicit_item_bounds(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
186 desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
187 separate_provide_extern
190 /// Elaborated version of the predicates from `explicit_item_bounds`.
196 /// type MyAType: Eq + ?Sized;
200 /// `explicit_item_bounds` returns `[<Self as MyTrait>::MyAType: Eq]`,
201 /// and `item_bounds` returns
204 /// <Self as Trait>::MyAType: Eq,
205 /// <Self as Trait>::MyAType: PartialEq<<Self as Trait>::MyAType>
209 /// Bounds from the parent (e.g. with nested impl trait) are not included.
210 query item_bounds(key: DefId) -> &'tcx ty::List<ty::Predicate<'tcx>> {
211 desc { |tcx| "elaborating item bounds for `{}`", tcx.def_path_str(key) }
214 query native_libraries(_: CrateNum) -> Lrc<Vec<NativeLib>> {
215 desc { "looking up the native libraries of a linked crate" }
216 separate_provide_extern
219 query lint_levels(_: ()) -> LintLevelMap {
220 storage(ArenaCacheSelector<'tcx>)
222 desc { "computing the lint levels for items in this crate" }
225 query parent_module_from_def_id(key: LocalDefId) -> LocalDefId {
227 desc { |tcx| "parent module of `{}`", tcx.def_path_str(key.to_def_id()) }
230 query expn_that_defined(key: DefId) -> rustc_span::ExpnId {
231 // This query reads from untracked data in definitions.
233 desc { |tcx| "expansion that defined `{}`", tcx.def_path_str(key) }
234 separate_provide_extern
237 query is_panic_runtime(_: CrateNum) -> bool {
239 desc { "checking if the crate is_panic_runtime" }
240 separate_provide_extern
243 /// Fetch the THIR for a given body. If typeck for that body failed, returns an empty `Thir`.
244 query thir_body(key: ty::WithOptConstParam<LocalDefId>) -> (&'tcx Steal<thir::Thir<'tcx>>, thir::ExprId) {
245 // Perf tests revealed that hashing THIR is inefficient (see #85729).
247 desc { |tcx| "building THIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
250 /// Create a THIR tree for debugging.
251 query thir_tree(key: ty::WithOptConstParam<LocalDefId>) -> String {
253 desc { |tcx| "constructing THIR tree for `{}`", tcx.def_path_str(key.did.to_def_id()) }
256 /// Set of all the `DefId`s in this crate that have MIR associated with
257 /// them. This includes all the body owners, but also things like struct
259 query mir_keys(_: ()) -> FxHashSet<LocalDefId> {
260 storage(ArenaCacheSelector<'tcx>)
261 desc { "getting a list of all mir_keys" }
264 /// Maps DefId's that have an associated `mir::Body` to the result
265 /// of the MIR const-checking pass. This is the set of qualifs in
266 /// the final value of a `const`.
267 query mir_const_qualif(key: DefId) -> mir::ConstQualifs {
268 desc { |tcx| "const checking `{}`", tcx.def_path_str(key) }
269 cache_on_disk_if { key.is_local() }
270 separate_provide_extern
272 query mir_const_qualif_const_arg(
273 key: (LocalDefId, DefId)
274 ) -> mir::ConstQualifs {
276 |tcx| "const checking the const argument `{}`",
277 tcx.def_path_str(key.0.to_def_id())
281 /// Fetch the MIR for a given `DefId` right after it's built - this includes
282 /// unreachable code.
283 query mir_built(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
284 desc { |tcx| "building MIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
287 /// Fetch the MIR for a given `DefId` up till the point where it is
288 /// ready for const qualification.
290 /// See the README for the `mir` module for details.
291 query mir_const(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
293 |tcx| "processing MIR for {}`{}`",
294 if key.const_param_did.is_some() { "the const argument " } else { "" },
295 tcx.def_path_str(key.did.to_def_id()),
300 /// Try to build an abstract representation of the given constant.
301 query thir_abstract_const(
303 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
305 |tcx| "building an abstract representation for {}", tcx.def_path_str(key),
307 separate_provide_extern
309 /// Try to build an abstract representation of the given constant.
310 query thir_abstract_const_of_const_arg(
311 key: (LocalDefId, DefId)
312 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
315 "building an abstract representation for the const argument {}",
316 tcx.def_path_str(key.0.to_def_id()),
320 query try_unify_abstract_consts(key: (
321 ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
324 |tcx| "trying to unify the generic constants {} and {}",
325 tcx.def_path_str(key.0.def.did), tcx.def_path_str(key.1.def.did)
329 query mir_drops_elaborated_and_const_checked(
330 key: ty::WithOptConstParam<LocalDefId>
331 ) -> &'tcx Steal<mir::Body<'tcx>> {
333 desc { |tcx| "elaborating drops for `{}`", tcx.def_path_str(key.did.to_def_id()) }
338 ) -> &'tcx mir::Body<'tcx> {
339 desc { |tcx| "caching mir of `{}` for CTFE", tcx.def_path_str(key) }
340 cache_on_disk_if { key.is_local() }
341 separate_provide_extern
344 query mir_for_ctfe_of_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::Body<'tcx> {
346 |tcx| "MIR for CTFE of the const argument `{}`",
347 tcx.def_path_str(key.0.to_def_id())
351 query mir_promoted(key: ty::WithOptConstParam<LocalDefId>) ->
353 &'tcx Steal<mir::Body<'tcx>>,
354 &'tcx Steal<IndexVec<mir::Promoted, mir::Body<'tcx>>>
358 |tcx| "processing {}`{}`",
359 if key.const_param_did.is_some() { "the const argument " } else { "" },
360 tcx.def_path_str(key.did.to_def_id()),
364 query symbols_for_closure_captures(
365 key: (LocalDefId, DefId)
366 ) -> Vec<rustc_span::Symbol> {
368 |tcx| "symbols for captures of closure `{}` in `{}`",
369 tcx.def_path_str(key.1),
370 tcx.def_path_str(key.0.to_def_id())
374 /// MIR after our optimization passes have run. This is MIR that is ready
375 /// for codegen. This is also the only query that can fetch non-local MIR, at present.
376 query optimized_mir(key: DefId) -> &'tcx mir::Body<'tcx> {
377 desc { |tcx| "optimizing MIR for `{}`", tcx.def_path_str(key) }
378 cache_on_disk_if { key.is_local() }
379 separate_provide_extern
382 /// Returns coverage summary info for a function, after executing the `InstrumentCoverage`
383 /// MIR pass (assuming the -Zinstrument-coverage option is enabled).
384 query coverageinfo(key: ty::InstanceDef<'tcx>) -> mir::CoverageInfo {
385 desc { |tcx| "retrieving coverage info from MIR for `{}`", tcx.def_path_str(key.def_id()) }
386 storage(ArenaCacheSelector<'tcx>)
389 /// Returns the name of the file that contains the function body, if instrumented for coverage.
390 query covered_file_name(key: DefId) -> Option<Symbol> {
392 |tcx| "retrieving the covered file name, if instrumented, for `{}`",
393 tcx.def_path_str(key)
395 storage(ArenaCacheSelector<'tcx>)
396 cache_on_disk_if { key.is_local() }
399 /// Returns the `CodeRegions` for a function that has instrumented coverage, in case the
400 /// function was optimized out before codegen, and before being added to the Coverage Map.
401 query covered_code_regions(key: DefId) -> Vec<&'tcx mir::coverage::CodeRegion> {
403 |tcx| "retrieving the covered `CodeRegion`s, if instrumented, for `{}`",
404 tcx.def_path_str(key)
406 storage(ArenaCacheSelector<'tcx>)
407 cache_on_disk_if { key.is_local() }
410 /// The `DefId` is the `DefId` of the containing MIR body. Promoteds do not have their own
411 /// `DefId`. This function returns all promoteds in the specified body. The body references
412 /// promoteds by the `DefId` and the `mir::Promoted` index. This is necessary, because
413 /// after inlining a body may refer to promoteds from other bodies. In that case you still
414 /// need to use the `DefId` of the original body.
415 query promoted_mir(key: DefId) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
416 desc { |tcx| "optimizing promoted MIR for `{}`", tcx.def_path_str(key) }
417 cache_on_disk_if { key.is_local() }
418 separate_provide_extern
420 query promoted_mir_of_const_arg(
421 key: (LocalDefId, DefId)
422 ) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
424 |tcx| "optimizing promoted MIR for the const argument `{}`",
425 tcx.def_path_str(key.0.to_def_id()),
429 /// Erases regions from `ty` to yield a new type.
430 /// Normally you would just use `tcx.erase_regions(value)`,
431 /// however, which uses this query as a kind of cache.
432 query erase_regions_ty(ty: Ty<'tcx>) -> Ty<'tcx> {
433 // This query is not expected to have input -- as a result, it
434 // is not a good candidates for "replay" because it is essentially a
435 // pure function of its input (and hence the expectation is that
436 // no caller would be green **apart** from just these
437 // queries). Making it anonymous avoids hashing the result, which
438 // may save a bit of time.
440 desc { "erasing regions from `{:?}`", ty }
443 query wasm_import_module_map(_: CrateNum) -> FxHashMap<DefId, String> {
444 storage(ArenaCacheSelector<'tcx>)
445 desc { "wasm import module map" }
448 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
449 /// predicates (where-clauses) directly defined on it. This is
450 /// equal to the `explicit_predicates_of` predicates plus the
451 /// `inferred_outlives_of` predicates.
452 query predicates_defined_on(key: DefId) -> ty::GenericPredicates<'tcx> {
453 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
456 /// Returns everything that looks like a predicate written explicitly
457 /// by the user on a trait item.
459 /// Traits are unusual, because predicates on associated types are
460 /// converted into bounds on that type for backwards compatibility:
462 /// trait X where Self::U: Copy { type U; }
466 /// trait X { type U: Copy; }
468 /// `explicit_predicates_of` and `explicit_item_bounds` will then take
469 /// the appropriate subsets of the predicates here.
470 query trait_explicit_predicates_and_bounds(key: LocalDefId) -> ty::GenericPredicates<'tcx> {
471 desc { |tcx| "computing explicit predicates of trait `{}`", tcx.def_path_str(key.to_def_id()) }
474 /// Returns the predicates written explicitly by the user.
475 query explicit_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
476 desc { |tcx| "computing explicit predicates of `{}`", tcx.def_path_str(key) }
477 separate_provide_extern
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) }
484 separate_provide_extern
487 /// Maps from the `DefId` of a trait to the list of
488 /// super-predicates. This is a subset of the full list of
489 /// predicates. We store these in a separate map because we must
490 /// evaluate them even during type conversion, often before the
491 /// full predicates are available (note that supertraits have
492 /// additional acyclicity requirements).
493 query super_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
494 desc { |tcx| "computing the super predicates of `{}`", tcx.def_path_str(key) }
495 separate_provide_extern
498 /// The `Option<Ident>` is the name of an associated type. If it is `None`, then this query
499 /// returns the full set of predicates. If `Some<Ident>`, then the query returns only the
500 /// subset of super-predicates that reference traits that define the given associated type.
501 /// This is used to avoid cycles in resolving types like `T::Item`.
502 query super_predicates_that_define_assoc_type(key: (DefId, Option<rustc_span::symbol::Ident>)) -> ty::GenericPredicates<'tcx> {
503 desc { |tcx| "computing the super traits of `{}`{}",
504 tcx.def_path_str(key.0),
505 if let Some(assoc_name) = key.1 { format!(" with associated type name `{}`", assoc_name) } else { "".to_string() },
509 /// To avoid cycles within the predicates of a single item we compute
510 /// per-type-parameter predicates for resolving `T::AssocTy`.
511 query type_param_predicates(key: (DefId, LocalDefId, rustc_span::symbol::Ident)) -> ty::GenericPredicates<'tcx> {
512 desc { |tcx| "computing the bounds for type parameter `{}`", {
513 let id = tcx.hir().local_def_id_to_hir_id(key.1);
514 tcx.hir().ty_param_name(id)
518 query trait_def(key: DefId) -> ty::TraitDef {
519 desc { |tcx| "computing trait definition for `{}`", tcx.def_path_str(key) }
520 storage(ArenaCacheSelector<'tcx>)
521 separate_provide_extern
523 query adt_def(key: DefId) -> &'tcx ty::AdtDef {
524 desc { |tcx| "computing ADT definition for `{}`", tcx.def_path_str(key) }
525 cache_on_disk_if { key.is_local() }
526 separate_provide_extern
528 query adt_destructor(key: DefId) -> Option<ty::Destructor> {
529 desc { |tcx| "computing `Drop` impl for `{}`", tcx.def_path_str(key) }
530 separate_provide_extern
533 // The cycle error here should be reported as an error by `check_representable`.
534 // We consider the type as Sized in the meanwhile to avoid
535 // further errors (done in impl Value for AdtSizedConstraint).
536 // Use `cycle_delay_bug` to delay the cycle error here to be emitted later
537 // in case we accidentally otherwise don't emit an error.
538 query adt_sized_constraint(
540 ) -> AdtSizedConstraint<'tcx> {
541 desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
545 query adt_dtorck_constraint(
547 ) -> Result<DtorckConstraint<'tcx>, NoSolution> {
548 desc { |tcx| "computing drop-check constraints for `{}`", tcx.def_path_str(key) }
551 /// Returns `true` if this is a const fn, use the `is_const_fn` to know whether your crate
552 /// actually sees it as const fn (e.g., the const-fn-ness might be unstable and you might
553 /// not have the feature gate active).
555 /// **Do not call this function manually.** It is only meant to cache the base data for the
556 /// `is_const_fn` function.
557 query is_const_fn_raw(key: DefId) -> bool {
558 desc { |tcx| "checking if item is const fn: `{}`", tcx.def_path_str(key) }
559 separate_provide_extern
562 query asyncness(key: DefId) -> hir::IsAsync {
563 desc { |tcx| "checking if the function is async: `{}`", tcx.def_path_str(key) }
564 separate_provide_extern
567 /// Returns `true` if calls to the function may be promoted.
569 /// This is either because the function is e.g., a tuple-struct or tuple-variant
570 /// constructor, or because it has the `#[rustc_promotable]` attribute. The attribute should
571 /// be removed in the future in favour of some form of check which figures out whether the
572 /// function does not inspect the bits of any of its arguments (so is essentially just a
573 /// constructor function).
574 query is_promotable_const_fn(key: DefId) -> bool {
575 desc { |tcx| "checking if item is promotable: `{}`", tcx.def_path_str(key) }
578 /// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
579 query is_foreign_item(key: DefId) -> bool {
580 desc { |tcx| "checking if `{}` is a foreign item", tcx.def_path_str(key) }
581 separate_provide_extern
584 /// Returns `Some(mutability)` if the node pointed to by `def_id` is a static item.
585 query static_mutability(def_id: DefId) -> Option<hir::Mutability> {
586 desc { |tcx| "looking up static mutability of `{}`", tcx.def_path_str(def_id) }
587 separate_provide_extern
590 /// Returns `Some(generator_kind)` if the node pointed to by `def_id` is a generator.
591 query generator_kind(def_id: DefId) -> Option<hir::GeneratorKind> {
592 desc { |tcx| "looking up generator kind of `{}`", tcx.def_path_str(def_id) }
593 separate_provide_extern
596 /// Gets a map with the variance of every item; use `item_variance` instead.
597 query crate_variances(_: ()) -> ty::CrateVariancesMap<'tcx> {
598 storage(ArenaCacheSelector<'tcx>)
599 desc { "computing the variances for items in this crate" }
602 /// Maps from the `DefId` of a type or region parameter to its (inferred) variance.
603 query variances_of(def_id: DefId) -> &'tcx [ty::Variance] {
604 desc { |tcx| "computing the variances of `{}`", tcx.def_path_str(def_id) }
605 separate_provide_extern
608 /// Maps from thee `DefId` of a type to its (inferred) outlives.
609 query inferred_outlives_crate(_: ()) -> ty::CratePredicatesMap<'tcx> {
610 storage(ArenaCacheSelector<'tcx>)
611 desc { "computing the inferred outlives predicates for items in this crate" }
614 /// Maps from an impl/trait `DefId` to a list of the `DefId`s of its items.
615 query associated_item_def_ids(key: DefId) -> &'tcx [DefId] {
616 desc { |tcx| "collecting associated items of `{}`", tcx.def_path_str(key) }
617 separate_provide_extern
620 /// Maps from a trait item to the trait item "descriptor".
621 query associated_item(key: DefId) -> ty::AssocItem {
622 desc { |tcx| "computing associated item data for `{}`", tcx.def_path_str(key) }
623 storage(ArenaCacheSelector<'tcx>)
624 separate_provide_extern
627 /// Collects the associated items defined on a trait or impl.
628 query associated_items(key: DefId) -> ty::AssocItems<'tcx> {
629 storage(ArenaCacheSelector<'tcx>)
630 desc { |tcx| "collecting associated items of {}", tcx.def_path_str(key) }
633 /// Maps from associated items on a trait to the corresponding associated
634 /// item on the impl specified by `impl_id`.
636 /// For example, with the following code
641 /// trait Trait { // trait_id
642 /// fn f(); // trait_f
643 /// fn g() {} // trait_g
646 /// impl Trait for Type { // impl_id
647 /// fn f() {} // impl_f
648 /// fn g() {} // impl_g
652 /// The map returned for `tcx.impl_item_implementor_ids(impl_id)` would be
653 ///`{ trait_f: impl_f, trait_g: impl_g }`
654 query impl_item_implementor_ids(impl_id: DefId) -> FxHashMap<DefId, DefId> {
655 desc { |tcx| "comparing impl items against trait for {}", tcx.def_path_str(impl_id) }
656 storage(ArenaCacheSelector<'tcx>)
659 /// Given an `impl_id`, return the trait it implements.
660 /// Return `None` if this is an inherent impl.
661 query impl_trait_ref(impl_id: DefId) -> Option<ty::TraitRef<'tcx>> {
662 desc { |tcx| "computing trait implemented by `{}`", tcx.def_path_str(impl_id) }
663 separate_provide_extern
665 query impl_polarity(impl_id: DefId) -> ty::ImplPolarity {
666 desc { |tcx| "computing implementation polarity of `{}`", tcx.def_path_str(impl_id) }
667 separate_provide_extern
670 query issue33140_self_ty(key: DefId) -> Option<ty::Ty<'tcx>> {
671 desc { |tcx| "computing Self type wrt issue #33140 `{}`", tcx.def_path_str(key) }
674 /// Maps a `DefId` of a type to a list of its inherent impls.
675 /// Contains implementations of methods that are inherent to a type.
676 /// Methods in these implementations don't need to be exported.
677 query inherent_impls(key: DefId) -> &'tcx [DefId] {
678 desc { |tcx| "collecting inherent impls for `{}`", tcx.def_path_str(key) }
679 separate_provide_extern
682 /// The result of unsafety-checking this `LocalDefId`.
683 query unsafety_check_result(key: LocalDefId) -> &'tcx mir::UnsafetyCheckResult {
684 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
685 cache_on_disk_if { true }
687 query unsafety_check_result_for_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::UnsafetyCheckResult {
689 |tcx| "unsafety-checking the const argument `{}`",
690 tcx.def_path_str(key.0.to_def_id())
694 /// Unsafety-check this `LocalDefId` with THIR unsafeck. This should be
695 /// used with `-Zthir-unsafeck`.
696 query thir_check_unsafety(key: LocalDefId) {
697 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
698 cache_on_disk_if { true }
700 query thir_check_unsafety_for_const_arg(key: (LocalDefId, DefId)) {
702 |tcx| "unsafety-checking the const argument `{}`",
703 tcx.def_path_str(key.0.to_def_id())
707 /// HACK: when evaluated, this reports an "unsafe derive on repr(packed)" error.
709 /// Unsafety checking is executed for each method separately, but we only want
710 /// to emit this error once per derive. As there are some impls with multiple
711 /// methods, we use a query for deduplication.
712 query unsafe_derive_on_repr_packed(key: LocalDefId) -> () {
713 desc { |tcx| "processing `{}`", tcx.def_path_str(key.to_def_id()) }
716 /// Computes the signature of the function.
717 query fn_sig(key: DefId) -> ty::PolyFnSig<'tcx> {
718 desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }
719 separate_provide_extern
722 /// Performs lint checking for the module.
723 query lint_mod(key: LocalDefId) -> () {
724 desc { |tcx| "linting {}", describe_as_module(key, tcx) }
727 /// Checks the attributes in the module.
728 query check_mod_attrs(key: LocalDefId) -> () {
729 desc { |tcx| "checking attributes in {}", describe_as_module(key, tcx) }
732 /// Checks for uses of unstable APIs in the module.
733 query check_mod_unstable_api_usage(key: LocalDefId) -> () {
734 desc { |tcx| "checking for unstable API usage in {}", describe_as_module(key, tcx) }
737 /// Checks the const bodies in the module for illegal operations (e.g. `if` or `loop`).
738 query check_mod_const_bodies(key: LocalDefId) -> () {
739 desc { |tcx| "checking consts in {}", describe_as_module(key, tcx) }
742 /// Checks the loops in the module.
743 query check_mod_loops(key: LocalDefId) -> () {
744 desc { |tcx| "checking loops in {}", describe_as_module(key, tcx) }
747 query check_mod_naked_functions(key: LocalDefId) -> () {
748 desc { |tcx| "checking naked functions in {}", describe_as_module(key, tcx) }
751 query check_mod_item_types(key: LocalDefId) -> () {
752 desc { |tcx| "checking item types in {}", describe_as_module(key, tcx) }
755 query check_mod_privacy(key: LocalDefId) -> () {
756 desc { |tcx| "checking privacy in {}", describe_as_module(key, tcx) }
759 query check_mod_intrinsics(key: LocalDefId) -> () {
760 desc { |tcx| "checking intrinsics in {}", describe_as_module(key, tcx) }
763 query check_mod_liveness(key: LocalDefId) -> () {
764 desc { |tcx| "checking liveness of variables in {}", describe_as_module(key, tcx) }
767 query check_mod_impl_wf(key: LocalDefId) -> () {
768 desc { |tcx| "checking that impls are well-formed in {}", describe_as_module(key, tcx) }
771 query collect_mod_item_types(key: LocalDefId) -> () {
772 desc { |tcx| "collecting item types in {}", describe_as_module(key, tcx) }
775 /// Caches `CoerceUnsized` kinds for impls on custom types.
776 query coerce_unsized_info(key: DefId) -> ty::adjustment::CoerceUnsizedInfo {
777 desc { |tcx| "computing CoerceUnsized info for `{}`", tcx.def_path_str(key) }
778 separate_provide_extern
781 query typeck_item_bodies(_: ()) -> () {
782 desc { "type-checking all item bodies" }
785 query typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
786 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
787 cache_on_disk_if { true }
789 query typeck_const_arg(
790 key: (LocalDefId, DefId)
791 ) -> &'tcx ty::TypeckResults<'tcx> {
793 |tcx| "type-checking the const argument `{}`",
794 tcx.def_path_str(key.0.to_def_id()),
797 query diagnostic_only_typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
798 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
799 cache_on_disk_if { true }
800 load_cached(tcx, id) {
803 match match tcx.on_disk_cache().as_ref() {
804 Some(c) => c.try_load_query_result(*tcx, id),
807 Some(x) => Some(&*tcx.arena.alloc(x)),
811 #[cfg(not(bootstrap))]
813 let typeck_results: Option<ty::TypeckResults<'tcx>> = tcx
814 .on_disk_cache().as_ref()
815 .and_then(|c| c.try_load_query_result(*tcx, id));
817 typeck_results.map(|x| &*tcx.arena.alloc(x))
822 query used_trait_imports(key: LocalDefId) -> &'tcx FxHashSet<LocalDefId> {
823 desc { |tcx| "used_trait_imports `{}`", tcx.def_path_str(key.to_def_id()) }
824 cache_on_disk_if { true }
827 query has_typeck_results(def_id: DefId) -> bool {
828 desc { |tcx| "checking whether `{}` has a body", tcx.def_path_str(def_id) }
831 query coherent_trait(def_id: DefId) -> () {
832 desc { |tcx| "coherence checking all impls of trait `{}`", tcx.def_path_str(def_id) }
835 /// Borrow-checks the function body. If this is a closure, returns
836 /// additional requirements that the closure's creator must verify.
837 query mir_borrowck(key: LocalDefId) -> &'tcx mir::BorrowCheckResult<'tcx> {
838 desc { |tcx| "borrow-checking `{}`", tcx.def_path_str(key.to_def_id()) }
839 cache_on_disk_if(tcx) { tcx.is_typeck_child(key.to_def_id()) }
841 query mir_borrowck_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::BorrowCheckResult<'tcx> {
843 |tcx| "borrow-checking the const argument`{}`",
844 tcx.def_path_str(key.0.to_def_id())
848 /// Gets a complete map from all types to their inherent impls.
849 /// Not meant to be used directly outside of coherence.
850 query crate_inherent_impls(k: ()) -> CrateInherentImpls {
851 storage(ArenaCacheSelector<'tcx>)
852 desc { "all inherent impls defined in crate" }
855 /// Checks all types in the crate for overlap in their inherent impls. Reports errors.
856 /// Not meant to be used directly outside of coherence.
857 query crate_inherent_impls_overlap_check(_: ()) -> () {
858 desc { "check for overlap between inherent impls defined in this crate" }
861 /// Checks whether all impls in the crate pass the overlap check, returning
862 /// which impls fail it. If all impls are correct, the returned slice is empty.
863 query orphan_check_crate(_: ()) -> &'tcx [LocalDefId] {
865 "checking whether the immpl in the this crate follow the orphan rules",
869 /// Check whether the function has any recursion that could cause the inliner to trigger
870 /// a cycle. Returns the call stack causing the cycle. The call stack does not contain the
871 /// current function, just all intermediate functions.
872 query mir_callgraph_reachable(key: (ty::Instance<'tcx>, LocalDefId)) -> bool {
875 "computing if `{}` (transitively) calls `{}`",
877 tcx.def_path_str(key.1.to_def_id()),
881 /// Obtain all the calls into other local functions
882 query mir_inliner_callees(key: ty::InstanceDef<'tcx>) -> &'tcx [(DefId, SubstsRef<'tcx>)] {
885 "computing all local function calls in `{}`",
886 tcx.def_path_str(key.def_id()),
890 /// Evaluates a constant and returns the computed allocation.
892 /// **Do not use this** directly, use the `tcx.eval_static_initializer` wrapper.
893 query eval_to_allocation_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
894 -> EvalToAllocationRawResult<'tcx> {
896 "const-evaluating + checking `{}`",
897 key.value.display(tcx)
899 cache_on_disk_if { true }
902 /// Evaluates const items or anonymous constants
903 /// (such as enum variant explicit discriminants or array lengths)
904 /// into a representation suitable for the type system and const generics.
906 /// **Do not use this** directly, use one of the following wrappers: `tcx.const_eval_poly`,
907 /// `tcx.const_eval_resolve`, `tcx.const_eval_instance`, or `tcx.const_eval_global_id`.
908 query eval_to_const_value_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
909 -> EvalToConstValueResult<'tcx> {
911 "simplifying constant for the type system `{}`",
912 key.value.display(tcx)
914 cache_on_disk_if { true }
917 /// Convert an evaluated constant to a type level constant or
918 /// return `None` if that is not possible.
919 query const_to_valtree(
920 key: ty::ParamEnvAnd<'tcx, ConstAlloc<'tcx>>
921 ) -> Option<ty::ValTree<'tcx>> {
922 desc { "destructure constant" }
926 /// Destructure a constant ADT or array into its variant index and its
928 query destructure_const(
929 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
930 ) -> mir::DestructuredConst<'tcx> {
931 desc { "destructure constant" }
935 /// Dereference a constant reference or raw pointer and turn the result into a constant
938 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
939 ) -> &'tcx ty::Const<'tcx> {
940 desc { "deref constant" }
944 query const_caller_location(key: (rustc_span::Symbol, u32, u32)) -> ConstValue<'tcx> {
945 desc { "get a &core::panic::Location referring to a span" }
949 key: LitToConstInput<'tcx>
950 ) -> Result<&'tcx ty::Const<'tcx>, LitToConstError> {
951 desc { "converting literal to const" }
954 query check_match(key: DefId) {
955 desc { |tcx| "match-checking `{}`", tcx.def_path_str(key) }
956 cache_on_disk_if { key.is_local() }
959 /// Performs part of the privacy check and computes "access levels".
960 query privacy_access_levels(_: ()) -> &'tcx AccessLevels {
962 desc { "privacy access levels" }
964 query check_private_in_public(_: ()) -> () {
966 desc { "checking for private elements in public interfaces" }
969 query reachable_set(_: ()) -> FxHashSet<LocalDefId> {
970 storage(ArenaCacheSelector<'tcx>)
971 desc { "reachability" }
974 /// Per-body `region::ScopeTree`. The `DefId` should be the owner `DefId` for the body;
975 /// in the case of closures, this will be redirected to the enclosing function.
976 query region_scope_tree(def_id: DefId) -> &'tcx region::ScopeTree {
977 desc { |tcx| "computing drop scopes for `{}`", tcx.def_path_str(def_id) }
980 /// Generates a MIR body for the shim.
981 query mir_shims(key: ty::InstanceDef<'tcx>) -> mir::Body<'tcx> {
982 storage(ArenaCacheSelector<'tcx>)
983 desc { |tcx| "generating MIR shim for `{}`", tcx.def_path_str(key.def_id()) }
986 /// The `symbol_name` query provides the symbol name for calling a
987 /// given instance from the local crate. In particular, it will also
988 /// look up the correct symbol name of instances from upstream crates.
989 query symbol_name(key: ty::Instance<'tcx>) -> ty::SymbolName<'tcx> {
990 desc { "computing the symbol for `{}`", key }
991 cache_on_disk_if { true }
994 query opt_def_kind(def_id: DefId) -> Option<DefKind> {
995 desc { |tcx| "looking up definition kind of `{}`", tcx.def_path_str(def_id) }
996 separate_provide_extern
999 /// Gets the span for the definition.
1000 query def_span(def_id: DefId) -> Span {
1001 desc { |tcx| "looking up span for `{}`", tcx.def_path_str(def_id) }
1002 separate_provide_extern
1005 /// Gets the span for the identifier of the definition.
1006 query def_ident_span(def_id: DefId) -> Option<Span> {
1007 desc { |tcx| "looking up span for `{}`'s identifier", tcx.def_path_str(def_id) }
1008 separate_provide_extern
1011 query lookup_stability(def_id: DefId) -> Option<&'tcx attr::Stability> {
1012 desc { |tcx| "looking up stability of `{}`", tcx.def_path_str(def_id) }
1013 separate_provide_extern
1016 query lookup_const_stability(def_id: DefId) -> Option<&'tcx attr::ConstStability> {
1017 desc { |tcx| "looking up const stability of `{}`", tcx.def_path_str(def_id) }
1018 separate_provide_extern
1021 query should_inherit_track_caller(def_id: DefId) -> bool {
1022 desc { |tcx| "computing should_inherit_track_caller of `{}`", tcx.def_path_str(def_id) }
1025 query lookup_deprecation_entry(def_id: DefId) -> Option<DeprecationEntry> {
1026 desc { |tcx| "checking whether `{}` is deprecated", tcx.def_path_str(def_id) }
1027 separate_provide_extern
1030 query item_attrs(def_id: DefId) -> &'tcx [ast::Attribute] {
1031 desc { |tcx| "collecting attributes of `{}`", tcx.def_path_str(def_id) }
1032 separate_provide_extern
1035 query codegen_fn_attrs(def_id: DefId) -> CodegenFnAttrs {
1036 desc { |tcx| "computing codegen attributes of `{}`", tcx.def_path_str(def_id) }
1037 storage(ArenaCacheSelector<'tcx>)
1038 cache_on_disk_if { true }
1041 query fn_arg_names(def_id: DefId) -> &'tcx [rustc_span::symbol::Ident] {
1042 desc { |tcx| "looking up function parameter names for `{}`", tcx.def_path_str(def_id) }
1043 separate_provide_extern
1045 /// Gets the rendered value of the specified constant or associated constant.
1046 /// Used by rustdoc.
1047 query rendered_const(def_id: DefId) -> String {
1048 desc { |tcx| "rendering constant intializer of `{}`", tcx.def_path_str(def_id) }
1049 separate_provide_extern
1051 query impl_parent(def_id: DefId) -> Option<DefId> {
1052 desc { |tcx| "computing specialization parent impl of `{}`", tcx.def_path_str(def_id) }
1053 separate_provide_extern
1056 /// Given an `associated_item`, find the trait it belongs to.
1057 /// Return `None` if the `DefId` is not an associated item.
1058 query trait_of_item(associated_item: DefId) -> Option<DefId> {
1059 desc { |tcx| "finding trait defining `{}`", tcx.def_path_str(associated_item) }
1060 separate_provide_extern
1063 query is_ctfe_mir_available(key: DefId) -> bool {
1064 desc { |tcx| "checking if item has ctfe mir available: `{}`", tcx.def_path_str(key) }
1065 separate_provide_extern
1067 query is_mir_available(key: DefId) -> bool {
1068 desc { |tcx| "checking if item has mir available: `{}`", tcx.def_path_str(key) }
1069 separate_provide_extern
1072 query own_existential_vtable_entries(
1073 key: ty::PolyExistentialTraitRef<'tcx>
1074 ) -> &'tcx [DefId] {
1075 desc { |tcx| "finding all existential vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1078 query vtable_entries(key: ty::PolyTraitRef<'tcx>)
1079 -> &'tcx [ty::VtblEntry<'tcx>] {
1080 desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1083 query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::Ty<'tcx>, ty::Ty<'tcx>)) -> Option<usize> {
1084 desc { |tcx| "finding the slot within vtable for trait object {} vtable ptr during trait upcasting coercion from {} vtable",
1088 query vtable_allocation(key: (Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>)) -> mir::interpret::AllocId {
1089 desc { |tcx| "vtable const allocation for <{} as {}>",
1091 key.1.map(|trait_ref| format!("{}", trait_ref)).unwrap_or("_".to_owned())
1095 query codegen_fulfill_obligation(
1096 key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
1097 ) -> Result<ImplSource<'tcx, ()>, ErrorReported> {
1098 cache_on_disk_if { true }
1100 "checking if `{}` fulfills its obligations",
1101 tcx.def_path_str(key.1.def_id())
1105 /// Return all `impl` blocks in the current crate.
1106 query all_local_trait_impls(_: ()) -> &'tcx BTreeMap<DefId, Vec<LocalDefId>> {
1107 desc { "local trait impls" }
1110 /// Given a trait `trait_id`, return all known `impl` blocks.
1111 query trait_impls_of(trait_id: DefId) -> ty::trait_def::TraitImpls {
1112 storage(ArenaCacheSelector<'tcx>)
1113 desc { |tcx| "trait impls of `{}`", tcx.def_path_str(trait_id) }
1116 query specialization_graph_of(trait_id: DefId) -> specialization_graph::Graph {
1117 storage(ArenaCacheSelector<'tcx>)
1118 desc { |tcx| "building specialization graph of trait `{}`", tcx.def_path_str(trait_id) }
1119 cache_on_disk_if { true }
1121 query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
1122 desc { |tcx| "determine object safety of trait `{}`", tcx.def_path_str(trait_id) }
1125 /// Gets the ParameterEnvironment for a given item; this environment
1126 /// will be in "user-facing" mode, meaning that it is suitable for
1127 /// type-checking etc, and it does not normalize specializable
1128 /// associated types. This is almost always what you want,
1129 /// unless you are doing MIR optimizations, in which case you
1130 /// might want to use `reveal_all()` method to change modes.
1131 query param_env(def_id: DefId) -> ty::ParamEnv<'tcx> {
1132 desc { |tcx| "computing normalized predicates of `{}`", tcx.def_path_str(def_id) }
1135 /// Like `param_env`, but returns the `ParamEnv` in `Reveal::All` mode.
1136 /// Prefer this over `tcx.param_env(def_id).with_reveal_all_normalized(tcx)`,
1137 /// as this method is more efficient.
1138 query param_env_reveal_all_normalized(def_id: DefId) -> ty::ParamEnv<'tcx> {
1139 desc { |tcx| "computing revealed normalized predicates of `{}`", tcx.def_path_str(def_id) }
1142 /// Trait selection queries. These are best used by invoking `ty.is_copy_modulo_regions()`,
1143 /// `ty.is_copy()`, etc, since that will prune the environment where possible.
1144 query is_copy_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1145 desc { "computing whether `{}` is `Copy`", env.value }
1148 /// Query backing `TyS::is_sized`.
1149 query is_sized_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1150 desc { "computing whether `{}` is `Sized`", env.value }
1153 /// Query backing `TyS::is_freeze`.
1154 query is_freeze_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1155 desc { "computing whether `{}` is freeze", env.value }
1158 /// Query backing `TyS::is_unpin`.
1159 query is_unpin_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1160 desc { "computing whether `{}` is `Unpin`", env.value }
1163 /// Query backing `TyS::needs_drop`.
1164 query needs_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1165 desc { "computing whether `{}` needs drop", env.value }
1168 /// Query backing `TyS::has_significant_drop_raw`.
1169 query has_significant_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1170 desc { "computing whether `{}` has a significant drop", env.value }
1174 /// Query backing `TyS::is_structural_eq_shallow`.
1176 /// This is only correct for ADTs. Call `is_structural_eq_shallow` to handle all types
1178 query has_structural_eq_impls(ty: Ty<'tcx>) -> bool {
1180 "computing whether `{:?}` implements `PartialStructuralEq` and `StructuralEq`",
1185 /// A list of types where the ADT requires drop if and only if any of
1186 /// those types require drop. If the ADT is known to always need drop
1187 /// then `Err(AlwaysRequiresDrop)` is returned.
1188 query adt_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1189 desc { |tcx| "computing when `{}` needs drop", tcx.def_path_str(def_id) }
1190 cache_on_disk_if { true }
1193 /// A list of types where the ADT requires drop if and only if any of those types
1194 /// has significant drop. A type marked with the attribute `rustc_insignificant_dtor`
1195 /// is considered to not be significant. A drop is significant if it is implemented
1196 /// by the user or does anything that will have any observable behavior (other than
1197 /// freeing up memory). If the ADT is known to have a significant destructor then
1198 /// `Err(AlwaysRequiresDrop)` is returned.
1199 query adt_significant_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1200 desc { |tcx| "computing when `{}` has a significant destructor", tcx.def_path_str(def_id) }
1201 cache_on_disk_if { false }
1204 /// Computes the layout of a type. Note that this implicitly
1205 /// executes in "reveal all" mode, and will normalize the input type.
1207 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1208 ) -> Result<ty::layout::TyAndLayout<'tcx>, ty::layout::LayoutError<'tcx>> {
1209 desc { "computing layout of `{}`", key.value }
1213 /// Compute a `FnAbi` suitable for indirect calls, i.e. to `fn` pointers.
1215 /// NB: this doesn't handle virtual calls - those should use `fn_abi_of_instance`
1216 /// instead, where the instance is an `InstanceDef::Virtual`.
1217 query fn_abi_of_fn_ptr(
1218 key: ty::ParamEnvAnd<'tcx, (ty::PolyFnSig<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1219 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1220 desc { "computing call ABI of `{}` function pointers", key.value.0 }
1224 /// Compute a `FnAbi` suitable for declaring/defining an `fn` instance, and for
1225 /// direct calls to an `fn`.
1227 /// NB: that includes virtual calls, which are represented by "direct calls"
1228 /// to an `InstanceDef::Virtual` instance (of `<dyn Trait as Trait>::fn`).
1229 query fn_abi_of_instance(
1230 key: ty::ParamEnvAnd<'tcx, (ty::Instance<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1231 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1232 desc { "computing call ABI of `{}`", key.value.0 }
1236 query dylib_dependency_formats(_: CrateNum)
1237 -> &'tcx [(CrateNum, LinkagePreference)] {
1238 desc { "dylib dependency formats of crate" }
1239 separate_provide_extern
1242 query dependency_formats(_: ()) -> Lrc<crate::middle::dependency_format::Dependencies> {
1243 desc { "get the linkage format of all dependencies" }
1246 query is_compiler_builtins(_: CrateNum) -> bool {
1248 desc { "checking if the crate is_compiler_builtins" }
1249 separate_provide_extern
1251 query has_global_allocator(_: CrateNum) -> bool {
1252 // This query depends on untracked global state in CStore
1255 desc { "checking if the crate has_global_allocator" }
1256 separate_provide_extern
1258 query has_panic_handler(_: CrateNum) -> bool {
1260 desc { "checking if the crate has_panic_handler" }
1261 separate_provide_extern
1263 query is_profiler_runtime(_: CrateNum) -> bool {
1265 desc { "query a crate is `#![profiler_runtime]`" }
1266 separate_provide_extern
1268 query panic_strategy(_: CrateNum) -> PanicStrategy {
1270 desc { "query a crate's configured panic strategy" }
1271 separate_provide_extern
1273 query panic_in_drop_strategy(_: CrateNum) -> PanicStrategy {
1275 desc { "query a crate's configured panic-in-drop strategy" }
1276 separate_provide_extern
1278 query is_no_builtins(_: CrateNum) -> bool {
1280 desc { "test whether a crate has `#![no_builtins]`" }
1281 separate_provide_extern
1283 query symbol_mangling_version(_: CrateNum) -> SymbolManglingVersion {
1285 desc { "query a crate's symbol mangling version" }
1286 separate_provide_extern
1289 query extern_crate(def_id: DefId) -> Option<&'tcx ExternCrate> {
1291 desc { "getting crate's ExternCrateData" }
1292 separate_provide_extern
1295 query specializes(_: (DefId, DefId)) -> bool {
1296 desc { "computing whether impls specialize one another" }
1298 query in_scope_traits_map(_: LocalDefId)
1299 -> Option<&'tcx FxHashMap<ItemLocalId, Box<[TraitCandidate]>>> {
1300 desc { "traits in scope at a block" }
1303 query module_reexports(def_id: LocalDefId) -> Option<&'tcx [ModChild]> {
1304 desc { |tcx| "looking up reexports of module `{}`", tcx.def_path_str(def_id.to_def_id()) }
1307 query impl_defaultness(def_id: DefId) -> hir::Defaultness {
1308 desc { |tcx| "looking up whether `{}` is a default impl", tcx.def_path_str(def_id) }
1309 separate_provide_extern
1312 query impl_constness(def_id: DefId) -> hir::Constness {
1313 desc { |tcx| "looking up whether `{}` is a const impl", tcx.def_path_str(def_id) }
1314 separate_provide_extern
1317 query check_item_well_formed(key: LocalDefId) -> () {
1318 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1320 query check_trait_item_well_formed(key: LocalDefId) -> () {
1321 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1323 query check_impl_item_well_formed(key: LocalDefId) -> () {
1324 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1327 // The `DefId`s of all non-generic functions and statics in the given crate
1328 // that can be reached from outside the crate.
1330 // We expect this items to be available for being linked to.
1332 // This query can also be called for `LOCAL_CRATE`. In this case it will
1333 // compute which items will be reachable to other crates, taking into account
1334 // the kind of crate that is currently compiled. Crates with only a
1335 // C interface have fewer reachable things.
1337 // Does not include external symbols that don't have a corresponding DefId,
1338 // like the compiler-generated `main` function and so on.
1339 query reachable_non_generics(_: CrateNum)
1340 -> DefIdMap<SymbolExportLevel> {
1341 storage(ArenaCacheSelector<'tcx>)
1342 desc { "looking up the exported symbols of a crate" }
1343 separate_provide_extern
1345 query is_reachable_non_generic(def_id: DefId) -> bool {
1346 desc { |tcx| "checking whether `{}` is an exported symbol", tcx.def_path_str(def_id) }
1347 separate_provide_extern
1349 query is_unreachable_local_definition(def_id: LocalDefId) -> bool {
1351 "checking whether `{}` is reachable from outside the crate",
1352 tcx.def_path_str(def_id.to_def_id()),
1356 /// The entire set of monomorphizations the local crate can safely link
1357 /// to because they are exported from upstream crates. Do not depend on
1358 /// this directly, as its value changes anytime a monomorphization gets
1359 /// added or removed in any upstream crate. Instead use the narrower
1360 /// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
1361 /// better, `Instance::upstream_monomorphization()`.
1362 query upstream_monomorphizations(_: ()) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1363 storage(ArenaCacheSelector<'tcx>)
1364 desc { "collecting available upstream monomorphizations" }
1367 /// Returns the set of upstream monomorphizations available for the
1368 /// generic function identified by the given `def_id`. The query makes
1369 /// sure to make a stable selection if the same monomorphization is
1370 /// available in multiple upstream crates.
1372 /// You likely want to call `Instance::upstream_monomorphization()`
1373 /// instead of invoking this query directly.
1374 query upstream_monomorphizations_for(def_id: DefId)
1375 -> Option<&'tcx FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1377 "collecting available upstream monomorphizations for `{}`",
1378 tcx.def_path_str(def_id),
1380 separate_provide_extern
1383 /// Returns the upstream crate that exports drop-glue for the given
1384 /// type (`substs` is expected to be a single-item list containing the
1385 /// type one wants drop-glue for).
1387 /// This is a subset of `upstream_monomorphizations_for` in order to
1388 /// increase dep-tracking granularity. Otherwise adding or removing any
1389 /// type with drop-glue in any upstream crate would invalidate all
1390 /// functions calling drop-glue of an upstream type.
1392 /// You likely want to call `Instance::upstream_monomorphization()`
1393 /// instead of invoking this query directly.
1395 /// NOTE: This query could easily be extended to also support other
1396 /// common functions that have are large set of monomorphizations
1397 /// (like `Clone::clone` for example).
1398 query upstream_drop_glue_for(substs: SubstsRef<'tcx>) -> Option<CrateNum> {
1399 desc { "available upstream drop-glue for `{:?}`", substs }
1402 query foreign_modules(_: CrateNum) -> Lrc<FxHashMap<DefId, ForeignModule>> {
1403 desc { "looking up the foreign modules of a linked crate" }
1404 separate_provide_extern
1407 /// Identifies the entry-point (e.g., the `main` function) for a given
1408 /// crate, returning `None` if there is no entry point (such as for library crates).
1409 query entry_fn(_: ()) -> Option<(DefId, EntryFnType)> {
1410 desc { "looking up the entry function of a crate" }
1412 query proc_macro_decls_static(_: ()) -> Option<LocalDefId> {
1413 desc { "looking up the derive registrar for a crate" }
1415 // The macro which defines `rustc_metadata::provide_extern` depends on this query's name.
1416 // Changing the name should cause a compiler error, but in case that changes, be aware.
1417 query crate_hash(_: CrateNum) -> Svh {
1419 desc { "looking up the hash a crate" }
1420 separate_provide_extern
1422 query crate_host_hash(_: CrateNum) -> Option<Svh> {
1424 desc { "looking up the hash of a host version of a crate" }
1425 separate_provide_extern
1427 query extra_filename(_: CrateNum) -> String {
1429 desc { "looking up the extra filename for a crate" }
1430 separate_provide_extern
1432 query crate_extern_paths(_: CrateNum) -> Vec<PathBuf> {
1434 desc { "looking up the paths for extern crates" }
1435 separate_provide_extern
1438 /// Given a crate and a trait, look up all impls of that trait in the crate.
1439 /// Return `(impl_id, self_ty)`.
1440 query implementations_of_trait(_: (CrateNum, DefId)) -> &'tcx [(DefId, Option<SimplifiedType>)] {
1441 desc { "looking up implementations of a trait in a crate" }
1442 separate_provide_extern
1445 query is_dllimport_foreign_item(def_id: DefId) -> bool {
1446 desc { |tcx| "is_dllimport_foreign_item({})", tcx.def_path_str(def_id) }
1448 query is_statically_included_foreign_item(def_id: DefId) -> bool {
1449 desc { |tcx| "is_statically_included_foreign_item({})", tcx.def_path_str(def_id) }
1451 query native_library_kind(def_id: DefId)
1452 -> Option<NativeLibKind> {
1453 desc { |tcx| "native_library_kind({})", tcx.def_path_str(def_id) }
1456 /// Does lifetime resolution, but does not descend into trait items. This
1457 /// should only be used for resolving lifetimes of on trait definitions,
1458 /// and is used to avoid cycles. Importantly, `resolve_lifetimes` still visits
1459 /// the same lifetimes and is responsible for diagnostics.
1460 /// See `rustc_resolve::late::lifetimes for details.
1461 query resolve_lifetimes_trait_definition(_: LocalDefId) -> ResolveLifetimes {
1462 storage(ArenaCacheSelector<'tcx>)
1463 desc { "resolving lifetimes for a trait definition" }
1465 /// Does lifetime resolution on items. Importantly, we can't resolve
1466 /// lifetimes directly on things like trait methods, because of trait params.
1467 /// See `rustc_resolve::late::lifetimes for details.
1468 query resolve_lifetimes(_: LocalDefId) -> ResolveLifetimes {
1469 storage(ArenaCacheSelector<'tcx>)
1470 desc { "resolving lifetimes" }
1472 query named_region_map(_: LocalDefId) ->
1473 Option<&'tcx FxHashMap<ItemLocalId, Region>> {
1474 desc { "looking up a named region" }
1476 query is_late_bound_map(_: LocalDefId) ->
1477 Option<(LocalDefId, &'tcx FxHashSet<ItemLocalId>)> {
1478 desc { "testing if a region is late bound" }
1480 /// For a given item (like a struct), gets the default lifetimes to be used
1481 /// for each parameter if a trait object were to be passed for that parameter.
1482 /// For example, for `struct Foo<'a, T, U>`, this would be `['static, 'static]`.
1483 /// For `struct Foo<'a, T: 'a, U>`, this would instead be `['a, 'static]`.
1484 query object_lifetime_defaults_map(_: LocalDefId)
1485 -> Option<Vec<ObjectLifetimeDefault>> {
1486 desc { "looking up lifetime defaults for a region on an item" }
1488 query late_bound_vars_map(_: LocalDefId)
1489 -> Option<&'tcx FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
1490 desc { "looking up late bound vars" }
1493 query lifetime_scope_map(_: LocalDefId) -> Option<FxHashMap<ItemLocalId, LifetimeScopeForPath>> {
1494 desc { "finds the lifetime scope for an HirId of a PathSegment" }
1497 query visibility(def_id: DefId) -> ty::Visibility {
1498 desc { |tcx| "computing visibility of `{}`", tcx.def_path_str(def_id) }
1499 separate_provide_extern
1502 /// Computes the set of modules from which this type is visibly uninhabited.
1503 /// To check whether a type is uninhabited at all (not just from a given module), you could
1504 /// check whether the forest is empty.
1505 query type_uninhabited_from(
1506 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1507 ) -> ty::inhabitedness::DefIdForest {
1508 desc { "computing the inhabitedness of `{:?}`", key }
1512 query dep_kind(_: CrateNum) -> CrateDepKind {
1514 desc { "fetching what a dependency looks like" }
1515 separate_provide_extern
1518 /// Gets the name of the crate.
1519 query crate_name(_: CrateNum) -> Symbol {
1521 desc { "fetching what a crate is named" }
1522 separate_provide_extern
1524 query module_children(def_id: DefId) -> &'tcx [ModChild] {
1525 desc { |tcx| "collecting child items of module `{}`", tcx.def_path_str(def_id) }
1526 separate_provide_extern
1528 query extern_mod_stmt_cnum(def_id: LocalDefId) -> Option<CrateNum> {
1529 desc { |tcx| "computing crate imported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1532 query lib_features(_: ()) -> LibFeatures {
1533 storage(ArenaCacheSelector<'tcx>)
1534 desc { "calculating the lib features map" }
1536 query defined_lib_features(_: CrateNum)
1537 -> &'tcx [(Symbol, Option<Symbol>)] {
1538 desc { "calculating the lib features defined in a crate" }
1539 separate_provide_extern
1541 /// Returns the lang items defined in another crate by loading it from metadata.
1542 query get_lang_items(_: ()) -> LanguageItems {
1543 storage(ArenaCacheSelector<'tcx>)
1545 desc { "calculating the lang items map" }
1548 /// Returns all diagnostic items defined in all crates.
1549 query all_diagnostic_items(_: ()) -> rustc_hir::diagnostic_items::DiagnosticItems {
1550 storage(ArenaCacheSelector<'tcx>)
1552 desc { "calculating the diagnostic items map" }
1555 /// Returns the lang items defined in another crate by loading it from metadata.
1556 query defined_lang_items(_: CrateNum) -> &'tcx [(DefId, usize)] {
1557 desc { "calculating the lang items defined in a crate" }
1558 separate_provide_extern
1561 /// Returns the diagnostic items defined in a crate.
1562 query diagnostic_items(_: CrateNum) -> rustc_hir::diagnostic_items::DiagnosticItems {
1563 storage(ArenaCacheSelector<'tcx>)
1564 desc { "calculating the diagnostic items map in a crate" }
1565 separate_provide_extern
1568 query missing_lang_items(_: CrateNum) -> &'tcx [LangItem] {
1569 desc { "calculating the missing lang items in a crate" }
1570 separate_provide_extern
1572 query visible_parent_map(_: ()) -> Lrc<DefIdMap<DefId>> {
1573 desc { "calculating the visible parent map" }
1575 query trimmed_def_paths(_: ()) -> FxHashMap<DefId, Symbol> {
1576 storage(ArenaCacheSelector<'tcx>)
1577 desc { "calculating trimmed def paths" }
1579 query missing_extern_crate_item(_: CrateNum) -> bool {
1581 desc { "seeing if we're missing an `extern crate` item for this crate" }
1582 separate_provide_extern
1584 query used_crate_source(_: CrateNum) -> Lrc<CrateSource> {
1586 desc { "looking at the source for a crate" }
1587 separate_provide_extern
1589 query postorder_cnums(_: ()) -> &'tcx [CrateNum] {
1591 desc { "generating a postorder list of CrateNums" }
1593 /// Returns whether or not the crate with CrateNum 'cnum'
1594 /// is marked as a private dependency
1595 query is_private_dep(c: CrateNum) -> bool {
1597 desc { "check whether crate {} is a private dependency", c }
1598 separate_provide_extern
1600 query allocator_kind(_: ()) -> Option<AllocatorKind> {
1602 desc { "allocator kind for the current crate" }
1605 query upvars_mentioned(def_id: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
1606 desc { |tcx| "collecting upvars mentioned in `{}`", tcx.def_path_str(def_id) }
1608 query maybe_unused_trait_import(def_id: LocalDefId) -> bool {
1609 desc { |tcx| "maybe_unused_trait_import for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1611 query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
1612 desc { "looking up all possibly unused extern crates" }
1614 query names_imported_by_glob_use(def_id: LocalDefId) -> &'tcx FxHashSet<Symbol> {
1615 desc { |tcx| "names_imported_by_glob_use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1618 query stability_index(_: ()) -> stability::Index<'tcx> {
1619 storage(ArenaCacheSelector<'tcx>)
1621 desc { "calculating the stability index for the local crate" }
1623 query crates(_: ()) -> &'tcx [CrateNum] {
1625 desc { "fetching all foreign CrateNum instances" }
1628 /// A list of all traits in a crate, used by rustdoc and error reporting.
1629 /// NOTE: Not named just `traits` due to a naming conflict.
1630 query traits_in_crate(_: CrateNum) -> &'tcx [DefId] {
1631 desc { "fetching all traits in a crate" }
1632 separate_provide_extern
1635 /// The list of symbols exported from the given crate.
1637 /// - All names contained in `exported_symbols(cnum)` are guaranteed to
1638 /// correspond to a publicly visible symbol in `cnum` machine code.
1639 /// - The `exported_symbols` sets of different crates do not intersect.
1640 query exported_symbols(_: CrateNum)
1641 -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1642 desc { "exported_symbols" }
1643 separate_provide_extern
1646 query collect_and_partition_mono_items(_: ()) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
1648 desc { "collect_and_partition_mono_items" }
1650 query is_codegened_item(def_id: DefId) -> bool {
1651 desc { |tcx| "determining whether `{}` needs codegen", tcx.def_path_str(def_id) }
1654 /// All items participating in code generation together with items inlined into them.
1655 query codegened_and_inlined_items(_: ()) -> &'tcx DefIdSet {
1657 desc { "codegened_and_inlined_items" }
1660 query codegen_unit(_: Symbol) -> &'tcx CodegenUnit<'tcx> {
1661 desc { "codegen_unit" }
1663 query unused_generic_params(key: ty::InstanceDef<'tcx>) -> FiniteBitSet<u32> {
1664 cache_on_disk_if { key.def_id().is_local() }
1666 |tcx| "determining which generic parameters are unused by `{}`",
1667 tcx.def_path_str(key.def_id())
1669 separate_provide_extern
1671 query backend_optimization_level(_: ()) -> OptLevel {
1672 desc { "optimization level used by backend" }
1675 query output_filenames(_: ()) -> Arc<OutputFilenames> {
1677 desc { "output_filenames" }
1680 /// Do not call this query directly: invoke `normalize` instead.
1681 query normalize_projection_ty(
1682 goal: CanonicalProjectionGoal<'tcx>
1684 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, NormalizationResult<'tcx>>>,
1687 desc { "normalizing `{:?}`", goal }
1691 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1692 query try_normalize_generic_arg_after_erasing_regions(
1693 goal: ParamEnvAnd<'tcx, GenericArg<'tcx>>
1694 ) -> Result<GenericArg<'tcx>, NoSolution> {
1695 desc { "normalizing `{}`", goal.value }
1699 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1700 query try_normalize_mir_const_after_erasing_regions(
1701 goal: ParamEnvAnd<'tcx, mir::ConstantKind<'tcx>>
1702 ) -> Result<mir::ConstantKind<'tcx>, NoSolution> {
1703 desc { "normalizing `{}`", goal.value }
1707 query implied_outlives_bounds(
1708 goal: CanonicalTyGoal<'tcx>
1710 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Vec<OutlivesBound<'tcx>>>>,
1713 desc { "computing implied outlives bounds for `{:?}`", goal }
1717 /// Do not call this query directly: invoke `infcx.at().dropck_outlives()` instead.
1718 query dropck_outlives(
1719 goal: CanonicalTyGoal<'tcx>
1721 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>,
1724 desc { "computing dropck types for `{:?}`", goal }
1728 /// Do not call this query directly: invoke `infcx.predicate_may_hold()` or
1729 /// `infcx.predicate_must_hold()` instead.
1730 query evaluate_obligation(
1731 goal: CanonicalPredicateGoal<'tcx>
1732 ) -> Result<traits::EvaluationResult, traits::OverflowError> {
1733 desc { "evaluating trait selection obligation `{}`", goal.value.value }
1736 query evaluate_goal(
1737 goal: traits::CanonicalChalkEnvironmentAndGoal<'tcx>
1739 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1742 desc { "evaluating trait selection obligation `{}`", goal.value }
1745 /// Do not call this query directly: part of the `Eq` type-op
1746 query type_op_ascribe_user_type(
1747 goal: CanonicalTypeOpAscribeUserTypeGoal<'tcx>
1749 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1752 desc { "evaluating `type_op_ascribe_user_type` `{:?}`", goal }
1756 /// Do not call this query directly: part of the `Eq` type-op
1758 goal: CanonicalTypeOpEqGoal<'tcx>
1760 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1763 desc { "evaluating `type_op_eq` `{:?}`", goal }
1767 /// Do not call this query directly: part of the `Subtype` type-op
1768 query type_op_subtype(
1769 goal: CanonicalTypeOpSubtypeGoal<'tcx>
1771 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1774 desc { "evaluating `type_op_subtype` `{:?}`", goal }
1778 /// Do not call this query directly: part of the `ProvePredicate` type-op
1779 query type_op_prove_predicate(
1780 goal: CanonicalTypeOpProvePredicateGoal<'tcx>
1782 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1785 desc { "evaluating `type_op_prove_predicate` `{:?}`", goal }
1788 /// Do not call this query directly: part of the `Normalize` type-op
1789 query type_op_normalize_ty(
1790 goal: CanonicalTypeOpNormalizeGoal<'tcx, Ty<'tcx>>
1792 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Ty<'tcx>>>,
1795 desc { "normalizing `{:?}`", goal }
1799 /// Do not call this query directly: part of the `Normalize` type-op
1800 query type_op_normalize_predicate(
1801 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::Predicate<'tcx>>
1803 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::Predicate<'tcx>>>,
1806 desc { "normalizing `{:?}`", goal }
1810 /// Do not call this query directly: part of the `Normalize` type-op
1811 query type_op_normalize_poly_fn_sig(
1812 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::PolyFnSig<'tcx>>
1814 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::PolyFnSig<'tcx>>>,
1817 desc { "normalizing `{:?}`", goal }
1821 /// Do not call this query directly: part of the `Normalize` type-op
1822 query type_op_normalize_fn_sig(
1823 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::FnSig<'tcx>>
1825 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::FnSig<'tcx>>>,
1828 desc { "normalizing `{:?}`", goal }
1832 query subst_and_check_impossible_predicates(key: (DefId, SubstsRef<'tcx>)) -> bool {
1834 "impossible substituted predicates:`{}`",
1835 tcx.def_path_str(key.0)
1839 query method_autoderef_steps(
1840 goal: CanonicalTyGoal<'tcx>
1841 ) -> MethodAutoderefStepsResult<'tcx> {
1842 desc { "computing autoderef types for `{:?}`", goal }
1846 query supported_target_features(_: CrateNum) -> FxHashMap<String, Option<Symbol>> {
1847 storage(ArenaCacheSelector<'tcx>)
1849 desc { "looking up supported target features" }
1852 /// Get an estimate of the size of an InstanceDef based on its MIR for CGU partitioning.
1853 query instance_def_size_estimate(def: ty::InstanceDef<'tcx>)
1855 desc { |tcx| "estimating size for `{}`", tcx.def_path_str(def.def_id()) }
1858 query features_query(_: ()) -> &'tcx rustc_feature::Features {
1860 desc { "looking up enabled feature gates" }
1863 /// Attempt to resolve the given `DefId` to an `Instance`, for the
1864 /// given generics args (`SubstsRef`), returning one of:
1865 /// * `Ok(Some(instance))` on success
1866 /// * `Ok(None)` when the `SubstsRef` are still too generic,
1867 /// and therefore don't allow finding the final `Instance`
1868 /// * `Err(ErrorReported)` when the `Instance` resolution process
1869 /// couldn't complete due to errors elsewhere - this is distinct
1870 /// from `Ok(None)` to avoid misleading diagnostics when an error
1871 /// has already been/will be emitted, for the original cause
1872 query resolve_instance(
1873 key: ty::ParamEnvAnd<'tcx, (DefId, SubstsRef<'tcx>)>
1874 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1875 desc { "resolving instance `{}`", ty::Instance::new(key.value.0, key.value.1) }
1879 query resolve_instance_of_const_arg(
1880 key: ty::ParamEnvAnd<'tcx, (LocalDefId, DefId, SubstsRef<'tcx>)>
1881 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1883 "resolving instance of the const argument `{}`",
1884 ty::Instance::new(key.value.0.to_def_id(), key.value.2),
1889 query normalize_opaque_types(key: &'tcx ty::List<ty::Predicate<'tcx>>) -> &'tcx ty::List<ty::Predicate<'tcx>> {
1890 desc { "normalizing opaque types in {:?}", key }
1893 /// Checks whether a type is definitely uninhabited. This is
1894 /// conservative: for some types that are uninhabited we return `false`,
1895 /// but we only return `true` for types that are definitely uninhabited.
1896 /// `ty.conservative_is_privately_uninhabited` implies that any value of type `ty`
1897 /// will be `Abi::Uninhabited`. (Note that uninhabited types may have nonzero
1898 /// size, to account for partial initialisation. See #49298 for details.)
1899 query conservative_is_privately_uninhabited(key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1900 desc { "conservatively checking if {:?} is privately uninhabited", key }
1904 query limits(key: ()) -> Limits {
1905 desc { "looking up limits" }
1908 /// Performs an HIR-based well-formed check on the item with the given `HirId`. If
1909 /// we get an `Unimplemented` error that matches the provided `Predicate`, return
1910 /// the cause of the newly created obligation.
1912 /// This is only used by error-reporting code to get a better cause (in particular, a better
1913 /// span) for an *existing* error. Therefore, it is best-effort, and may never handle
1914 /// all of the cases that the normal `ty::Ty`-based wfcheck does. This is fine,
1915 /// because the `ty::Ty`-based wfcheck is always run.
1916 query diagnostic_hir_wf_check(key: (ty::Predicate<'tcx>, traits::WellFormedLoc)) -> Option<traits::ObligationCause<'tcx>> {
1919 desc { "performing HIR wf-checking for predicate {:?} at item {:?}", key.0, key.1 }