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 ID for the given `LocalDefId` owner `key`.
61 /// This can be conveniently accessed by methods on `tcx.hir()`.
62 /// Avoid calling this query directly.
63 query local_def_id_to_hir_id(key: LocalDefId) -> hir::HirId {
64 desc { |tcx| "HIR ID of `{}`", tcx.def_path_str(key.to_def_id()) }
67 /// Gives access to the HIR node's parent for 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_parent(key: LocalDefId) -> hir::HirId {
72 desc { |tcx| "HIR parent of `{}`", tcx.def_path_str(key.to_def_id()) }
75 /// Gives access to the HIR nodes and bodies 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_owner_nodes(key: LocalDefId) -> hir::MaybeOwner<&'tcx hir::OwnerNodes<'tcx>> {
80 desc { |tcx| "HIR owner items in `{}`", tcx.def_path_str(key.to_def_id()) }
83 /// Gives access to the HIR attributes inside the HIR owner `key`.
85 /// This can be conveniently accessed by methods on `tcx.hir()`.
86 /// Avoid calling this query directly.
87 query hir_attrs(key: LocalDefId) -> &'tcx hir::AttributeMap<'tcx> {
88 desc { |tcx| "HIR owner attributes in `{}`", tcx.def_path_str(key.to_def_id()) }
91 /// Computes the `DefId` of the corresponding const parameter in case the `key` is a
92 /// const argument and returns `None` otherwise.
94 /// ```ignore (incomplete)
95 /// let a = foo::<7>();
96 /// // ^ Calling `opt_const_param_of` for this argument,
98 /// fn foo<const N: usize>()
99 /// // ^ returns this `DefId`.
102 /// // ^ While calling `opt_const_param_of` for other bodies returns `None`.
105 // It looks like caching this query on disk actually slightly
106 // worsened performance in #74376.
108 // Once const generics are more prevalently used, we might want to
109 // consider only caching calls returning `Some`.
110 query opt_const_param_of(key: LocalDefId) -> Option<DefId> {
111 desc { |tcx| "computing the optional const parameter of `{}`", tcx.def_path_str(key.to_def_id()) }
114 /// Given the def_id of a const-generic parameter, computes the associated default const
115 /// parameter. e.g. `fn example<const N: usize=3>` called on `N` would return `3`.
116 query const_param_default(param: DefId) -> &'tcx ty::Const<'tcx> {
117 desc { |tcx| "compute const default for a given parameter `{}`", tcx.def_path_str(param) }
118 separate_provide_extern
121 /// Records the type of every item.
122 query type_of(key: DefId) -> Ty<'tcx> {
126 use rustc_hir::def::DefKind;
127 match tcx.def_kind(key) {
128 DefKind::TyAlias => "expanding type alias",
129 DefKind::TraitAlias => "expanding trait alias",
130 _ => "computing type of",
133 path = tcx.def_path_str(key),
135 cache_on_disk_if { key.is_local() }
136 separate_provide_extern
139 query analysis(key: ()) -> Result<(), ErrorReported> {
141 desc { "running analysis passes on this crate" }
144 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to its
145 /// associated generics.
146 query generics_of(key: DefId) -> ty::Generics {
147 desc { |tcx| "computing generics of `{}`", tcx.def_path_str(key) }
148 storage(ArenaCacheSelector<'tcx>)
149 cache_on_disk_if { key.is_local() }
150 separate_provide_extern
153 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
154 /// predicates (where-clauses) that must be proven true in order
155 /// to reference it. This is almost always the "predicates query"
158 /// `predicates_of` builds on `predicates_defined_on` -- in fact,
159 /// it is almost always the same as that query, except for the
160 /// case of traits. For traits, `predicates_of` contains
161 /// an additional `Self: Trait<...>` predicate that users don't
162 /// actually write. This reflects the fact that to invoke the
163 /// trait (e.g., via `Default::default`) you must supply types
164 /// that actually implement the trait. (However, this extra
165 /// predicate gets in the way of some checks, which are intended
166 /// to operate over only the actual where-clauses written by the
168 query predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
169 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
170 cache_on_disk_if { key.is_local() }
173 /// Returns the list of bounds that can be used for
174 /// `SelectionCandidate::ProjectionCandidate(_)` and
175 /// `ProjectionTyCandidate::TraitDef`.
176 /// Specifically this is the bounds written on the trait's type
177 /// definition, or those after the `impl` keyword
179 /// ```ignore (incomplete)
180 /// type X: Bound + 'lt
182 /// impl Debug + Display
183 /// // ^^^^^^^^^^^^^^^
186 /// `key` is the `DefId` of the associated type or opaque type.
188 /// Bounds from the parent (e.g. with nested impl trait) are not included.
189 query explicit_item_bounds(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
190 desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
191 separate_provide_extern
194 /// Elaborated version of the predicates from `explicit_item_bounds`.
200 /// type MyAType: Eq + ?Sized;
204 /// `explicit_item_bounds` returns `[<Self as MyTrait>::MyAType: Eq]`,
205 /// and `item_bounds` returns
208 /// <Self as Trait>::MyAType: Eq,
209 /// <Self as Trait>::MyAType: PartialEq<<Self as Trait>::MyAType>
213 /// Bounds from the parent (e.g. with nested impl trait) are not included.
214 query item_bounds(key: DefId) -> &'tcx ty::List<ty::Predicate<'tcx>> {
215 desc { |tcx| "elaborating item bounds for `{}`", tcx.def_path_str(key) }
218 query native_libraries(_: CrateNum) -> Lrc<Vec<NativeLib>> {
219 desc { "looking up the native libraries of a linked crate" }
220 separate_provide_extern
223 query lint_levels(_: ()) -> LintLevelMap {
224 storage(ArenaCacheSelector<'tcx>)
226 desc { "computing the lint levels for items in this crate" }
229 query parent_module_from_def_id(key: LocalDefId) -> LocalDefId {
231 desc { |tcx| "parent module of `{}`", tcx.def_path_str(key.to_def_id()) }
234 query expn_that_defined(key: DefId) -> rustc_span::ExpnId {
235 // This query reads from untracked data in definitions.
237 desc { |tcx| "expansion that defined `{}`", tcx.def_path_str(key) }
238 separate_provide_extern
241 query is_panic_runtime(_: CrateNum) -> bool {
243 desc { "checking if the crate is_panic_runtime" }
244 separate_provide_extern
247 /// Fetch the THIR for a given body. If typeck for that body failed, returns an empty `Thir`.
248 query thir_body(key: ty::WithOptConstParam<LocalDefId>) -> (&'tcx Steal<thir::Thir<'tcx>>, thir::ExprId) {
249 // Perf tests revealed that hashing THIR is inefficient (see #85729).
251 desc { |tcx| "building THIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
254 /// Create a THIR tree for debugging.
255 query thir_tree(key: ty::WithOptConstParam<LocalDefId>) -> String {
257 desc { |tcx| "constructing THIR tree for `{}`", tcx.def_path_str(key.did.to_def_id()) }
260 /// Set of all the `DefId`s in this crate that have MIR associated with
261 /// them. This includes all the body owners, but also things like struct
263 query mir_keys(_: ()) -> rustc_data_structures::fx::FxIndexSet<LocalDefId> {
264 storage(ArenaCacheSelector<'tcx>)
265 desc { "getting a list of all mir_keys" }
268 /// Maps DefId's that have an associated `mir::Body` to the result
269 /// of the MIR const-checking pass. This is the set of qualifs in
270 /// the final value of a `const`.
271 query mir_const_qualif(key: DefId) -> mir::ConstQualifs {
272 desc { |tcx| "const checking `{}`", tcx.def_path_str(key) }
273 cache_on_disk_if { key.is_local() }
274 separate_provide_extern
276 query mir_const_qualif_const_arg(
277 key: (LocalDefId, DefId)
278 ) -> mir::ConstQualifs {
280 |tcx| "const checking the const argument `{}`",
281 tcx.def_path_str(key.0.to_def_id())
285 /// Fetch the MIR for a given `DefId` right after it's built - this includes
286 /// unreachable code.
287 query mir_built(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
288 desc { |tcx| "building MIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
291 /// Fetch the MIR for a given `DefId` up till the point where it is
292 /// ready for const qualification.
294 /// See the README for the `mir` module for details.
295 query mir_const(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
297 |tcx| "processing MIR for {}`{}`",
298 if key.const_param_did.is_some() { "the const argument " } else { "" },
299 tcx.def_path_str(key.did.to_def_id()),
304 /// Try to build an abstract representation of the given constant.
305 query thir_abstract_const(
307 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
309 |tcx| "building an abstract representation for {}", tcx.def_path_str(key),
311 separate_provide_extern
313 /// Try to build an abstract representation of the given constant.
314 query thir_abstract_const_of_const_arg(
315 key: (LocalDefId, DefId)
316 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
319 "building an abstract representation for the const argument {}",
320 tcx.def_path_str(key.0.to_def_id()),
324 query try_unify_abstract_consts(key: (
325 ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
328 |tcx| "trying to unify the generic constants {} and {}",
329 tcx.def_path_str(key.0.def.did), tcx.def_path_str(key.1.def.did)
333 query mir_drops_elaborated_and_const_checked(
334 key: ty::WithOptConstParam<LocalDefId>
335 ) -> &'tcx Steal<mir::Body<'tcx>> {
337 desc { |tcx| "elaborating drops for `{}`", tcx.def_path_str(key.did.to_def_id()) }
342 ) -> &'tcx mir::Body<'tcx> {
343 desc { |tcx| "caching mir of `{}` for CTFE", tcx.def_path_str(key) }
344 cache_on_disk_if { key.is_local() }
345 separate_provide_extern
348 query mir_for_ctfe_of_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::Body<'tcx> {
350 |tcx| "MIR for CTFE of the const argument `{}`",
351 tcx.def_path_str(key.0.to_def_id())
355 query mir_promoted(key: ty::WithOptConstParam<LocalDefId>) ->
357 &'tcx Steal<mir::Body<'tcx>>,
358 &'tcx Steal<IndexVec<mir::Promoted, mir::Body<'tcx>>>
362 |tcx| "processing {}`{}`",
363 if key.const_param_did.is_some() { "the const argument " } else { "" },
364 tcx.def_path_str(key.did.to_def_id()),
368 query symbols_for_closure_captures(
369 key: (LocalDefId, DefId)
370 ) -> Vec<rustc_span::Symbol> {
372 |tcx| "symbols for captures of closure `{}` in `{}`",
373 tcx.def_path_str(key.1),
374 tcx.def_path_str(key.0.to_def_id())
378 /// MIR after our optimization passes have run. This is MIR that is ready
379 /// for codegen. This is also the only query that can fetch non-local MIR, at present.
380 query optimized_mir(key: DefId) -> &'tcx mir::Body<'tcx> {
381 desc { |tcx| "optimizing MIR for `{}`", tcx.def_path_str(key) }
382 cache_on_disk_if { key.is_local() }
383 separate_provide_extern
386 /// Returns coverage summary info for a function, after executing the `InstrumentCoverage`
387 /// MIR pass (assuming the -Zinstrument-coverage option is enabled).
388 query coverageinfo(key: ty::InstanceDef<'tcx>) -> mir::CoverageInfo {
389 desc { |tcx| "retrieving coverage info from MIR for `{}`", tcx.def_path_str(key.def_id()) }
390 storage(ArenaCacheSelector<'tcx>)
393 /// Returns the `CodeRegions` for a function that has instrumented coverage, in case the
394 /// function was optimized out before codegen, and before being added to the Coverage Map.
395 query covered_code_regions(key: DefId) -> Vec<&'tcx mir::coverage::CodeRegion> {
397 |tcx| "retrieving the covered `CodeRegion`s, if instrumented, for `{}`",
398 tcx.def_path_str(key)
400 storage(ArenaCacheSelector<'tcx>)
401 cache_on_disk_if { key.is_local() }
404 /// The `DefId` is the `DefId` of the containing MIR body. Promoteds do not have their own
405 /// `DefId`. This function returns all promoteds in the specified body. The body references
406 /// promoteds by the `DefId` and the `mir::Promoted` index. This is necessary, because
407 /// after inlining a body may refer to promoteds from other bodies. In that case you still
408 /// need to use the `DefId` of the original body.
409 query promoted_mir(key: DefId) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
410 desc { |tcx| "optimizing promoted MIR for `{}`", tcx.def_path_str(key) }
411 cache_on_disk_if { key.is_local() }
412 separate_provide_extern
414 query promoted_mir_of_const_arg(
415 key: (LocalDefId, DefId)
416 ) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
418 |tcx| "optimizing promoted MIR for the const argument `{}`",
419 tcx.def_path_str(key.0.to_def_id()),
423 /// Erases regions from `ty` to yield a new type.
424 /// Normally you would just use `tcx.erase_regions(value)`,
425 /// however, which uses this query as a kind of cache.
426 query erase_regions_ty(ty: Ty<'tcx>) -> Ty<'tcx> {
427 // This query is not expected to have input -- as a result, it
428 // is not a good candidates for "replay" because it is essentially a
429 // pure function of its input (and hence the expectation is that
430 // no caller would be green **apart** from just these
431 // queries). Making it anonymous avoids hashing the result, which
432 // may save a bit of time.
434 desc { "erasing regions from `{:?}`", ty }
437 query wasm_import_module_map(_: CrateNum) -> FxHashMap<DefId, String> {
438 storage(ArenaCacheSelector<'tcx>)
439 desc { "wasm import module map" }
442 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
443 /// predicates (where-clauses) directly defined on it. This is
444 /// equal to the `explicit_predicates_of` predicates plus the
445 /// `inferred_outlives_of` predicates.
446 query predicates_defined_on(key: DefId) -> ty::GenericPredicates<'tcx> {
447 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
450 /// Returns everything that looks like a predicate written explicitly
451 /// by the user on a trait item.
453 /// Traits are unusual, because predicates on associated types are
454 /// converted into bounds on that type for backwards compatibility:
456 /// trait X where Self::U: Copy { type U; }
460 /// trait X { type U: Copy; }
462 /// `explicit_predicates_of` and `explicit_item_bounds` will then take
463 /// the appropriate subsets of the predicates here.
464 query trait_explicit_predicates_and_bounds(key: LocalDefId) -> ty::GenericPredicates<'tcx> {
465 desc { |tcx| "computing explicit predicates of trait `{}`", tcx.def_path_str(key.to_def_id()) }
468 /// Returns the predicates written explicitly by the user.
469 query explicit_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
470 desc { |tcx| "computing explicit predicates of `{}`", tcx.def_path_str(key) }
471 separate_provide_extern
474 /// Returns the inferred outlives predicates (e.g., for `struct
475 /// Foo<'a, T> { x: &'a T }`, this would return `T: 'a`).
476 query inferred_outlives_of(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
477 desc { |tcx| "computing inferred outlives predicates of `{}`", tcx.def_path_str(key) }
478 separate_provide_extern
481 /// Maps from the `DefId` of a trait to the list of
482 /// super-predicates. This is a subset of the full list of
483 /// predicates. We store these in a separate map because we must
484 /// evaluate them even during type conversion, often before the
485 /// full predicates are available (note that supertraits have
486 /// additional acyclicity requirements).
487 query super_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
488 desc { |tcx| "computing the super predicates of `{}`", tcx.def_path_str(key) }
489 separate_provide_extern
492 /// The `Option<Ident>` is the name of an associated type. If it is `None`, then this query
493 /// returns the full set of predicates. If `Some<Ident>`, then the query returns only the
494 /// subset of super-predicates that reference traits that define the given associated type.
495 /// This is used to avoid cycles in resolving types like `T::Item`.
496 query super_predicates_that_define_assoc_type(key: (DefId, Option<rustc_span::symbol::Ident>)) -> ty::GenericPredicates<'tcx> {
497 desc { |tcx| "computing the super traits of `{}`{}",
498 tcx.def_path_str(key.0),
499 if let Some(assoc_name) = key.1 { format!(" with associated type name `{}`", assoc_name) } else { "".to_string() },
503 /// To avoid cycles within the predicates of a single item we compute
504 /// per-type-parameter predicates for resolving `T::AssocTy`.
505 query type_param_predicates(key: (DefId, LocalDefId, rustc_span::symbol::Ident)) -> ty::GenericPredicates<'tcx> {
506 desc { |tcx| "computing the bounds for type parameter `{}`", {
507 let id = tcx.hir().local_def_id_to_hir_id(key.1);
508 tcx.hir().ty_param_name(id)
512 query trait_def(key: DefId) -> ty::TraitDef {
513 desc { |tcx| "computing trait definition for `{}`", tcx.def_path_str(key) }
514 storage(ArenaCacheSelector<'tcx>)
515 separate_provide_extern
517 query adt_def(key: DefId) -> &'tcx ty::AdtDef {
518 desc { |tcx| "computing ADT definition for `{}`", tcx.def_path_str(key) }
519 cache_on_disk_if { key.is_local() }
520 separate_provide_extern
522 query adt_destructor(key: DefId) -> Option<ty::Destructor> {
523 desc { |tcx| "computing `Drop` impl for `{}`", tcx.def_path_str(key) }
524 separate_provide_extern
527 // The cycle error here should be reported as an error by `check_representable`.
528 // We consider the type as Sized in the meanwhile to avoid
529 // further errors (done in impl Value for AdtSizedConstraint).
530 // Use `cycle_delay_bug` to delay the cycle error here to be emitted later
531 // in case we accidentally otherwise don't emit an error.
532 query adt_sized_constraint(
534 ) -> AdtSizedConstraint<'tcx> {
535 desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
539 query adt_dtorck_constraint(
541 ) -> Result<DtorckConstraint<'tcx>, NoSolution> {
542 desc { |tcx| "computing drop-check constraints for `{}`", tcx.def_path_str(key) }
545 /// Returns `true` if this is a const fn, use the `is_const_fn` to know whether your crate
546 /// actually sees it as const fn (e.g., the const-fn-ness might be unstable and you might
547 /// not have the feature gate active).
549 /// **Do not call this function manually.** It is only meant to cache the base data for the
550 /// `is_const_fn` function.
551 query is_const_fn_raw(key: DefId) -> bool {
552 desc { |tcx| "checking if item is const fn: `{}`", tcx.def_path_str(key) }
553 separate_provide_extern
556 query asyncness(key: DefId) -> hir::IsAsync {
557 desc { |tcx| "checking if the function is async: `{}`", tcx.def_path_str(key) }
558 separate_provide_extern
561 /// Returns `true` if calls to the function may be promoted.
563 /// This is either because the function is e.g., a tuple-struct or tuple-variant
564 /// constructor, or because it has the `#[rustc_promotable]` attribute. The attribute should
565 /// be removed in the future in favour of some form of check which figures out whether the
566 /// function does not inspect the bits of any of its arguments (so is essentially just a
567 /// constructor function).
568 query is_promotable_const_fn(key: DefId) -> bool {
569 desc { |tcx| "checking if item is promotable: `{}`", tcx.def_path_str(key) }
572 /// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
573 query is_foreign_item(key: DefId) -> bool {
574 desc { |tcx| "checking if `{}` is a foreign item", tcx.def_path_str(key) }
575 separate_provide_extern
578 /// Returns `Some(mutability)` if the node pointed to by `def_id` is a static item.
579 query static_mutability(def_id: DefId) -> Option<hir::Mutability> {
580 desc { |tcx| "looking up static mutability of `{}`", tcx.def_path_str(def_id) }
581 separate_provide_extern
584 /// Returns `Some(generator_kind)` if the node pointed to by `def_id` is a generator.
585 query generator_kind(def_id: DefId) -> Option<hir::GeneratorKind> {
586 desc { |tcx| "looking up generator kind of `{}`", tcx.def_path_str(def_id) }
587 separate_provide_extern
590 /// Gets a map with the variance of every item; use `item_variance` instead.
591 query crate_variances(_: ()) -> ty::CrateVariancesMap<'tcx> {
592 storage(ArenaCacheSelector<'tcx>)
593 desc { "computing the variances for items in this crate" }
596 /// Maps from the `DefId` of a type or region parameter to its (inferred) variance.
597 query variances_of(def_id: DefId) -> &'tcx [ty::Variance] {
598 desc { |tcx| "computing the variances of `{}`", tcx.def_path_str(def_id) }
599 separate_provide_extern
602 /// Maps from thee `DefId` of a type to its (inferred) outlives.
603 query inferred_outlives_crate(_: ()) -> ty::CratePredicatesMap<'tcx> {
604 storage(ArenaCacheSelector<'tcx>)
605 desc { "computing the inferred outlives predicates for items in this crate" }
608 /// Maps from an impl/trait `DefId` to a list of the `DefId`s of its items.
609 query associated_item_def_ids(key: DefId) -> &'tcx [DefId] {
610 desc { |tcx| "collecting associated items of `{}`", tcx.def_path_str(key) }
611 separate_provide_extern
614 /// Maps from a trait item to the trait item "descriptor".
615 query associated_item(key: DefId) -> ty::AssocItem {
616 desc { |tcx| "computing associated item data for `{}`", tcx.def_path_str(key) }
617 storage(ArenaCacheSelector<'tcx>)
618 separate_provide_extern
621 /// Collects the associated items defined on a trait or impl.
622 query associated_items(key: DefId) -> ty::AssocItems<'tcx> {
623 storage(ArenaCacheSelector<'tcx>)
624 desc { |tcx| "collecting associated items of {}", tcx.def_path_str(key) }
627 /// Maps from associated items on a trait to the corresponding associated
628 /// item on the impl specified by `impl_id`.
630 /// For example, with the following code
635 /// trait Trait { // trait_id
636 /// fn f(); // trait_f
637 /// fn g() {} // trait_g
640 /// impl Trait for Type { // impl_id
641 /// fn f() {} // impl_f
642 /// fn g() {} // impl_g
646 /// The map returned for `tcx.impl_item_implementor_ids(impl_id)` would be
647 ///`{ trait_f: impl_f, trait_g: impl_g }`
648 query impl_item_implementor_ids(impl_id: DefId) -> FxHashMap<DefId, DefId> {
649 desc { |tcx| "comparing impl items against trait for {}", tcx.def_path_str(impl_id) }
650 storage(ArenaCacheSelector<'tcx>)
653 /// Given an `impl_id`, return the trait it implements.
654 /// Return `None` if this is an inherent impl.
655 query impl_trait_ref(impl_id: DefId) -> Option<ty::TraitRef<'tcx>> {
656 desc { |tcx| "computing trait implemented by `{}`", tcx.def_path_str(impl_id) }
657 separate_provide_extern
659 query impl_polarity(impl_id: DefId) -> ty::ImplPolarity {
660 desc { |tcx| "computing implementation polarity of `{}`", tcx.def_path_str(impl_id) }
661 separate_provide_extern
664 query issue33140_self_ty(key: DefId) -> Option<ty::Ty<'tcx>> {
665 desc { |tcx| "computing Self type wrt issue #33140 `{}`", tcx.def_path_str(key) }
668 /// Maps a `DefId` of a type to a list of its inherent impls.
669 /// Contains implementations of methods that are inherent to a type.
670 /// Methods in these implementations don't need to be exported.
671 query inherent_impls(key: DefId) -> &'tcx [DefId] {
672 desc { |tcx| "collecting inherent impls for `{}`", tcx.def_path_str(key) }
673 separate_provide_extern
676 /// The result of unsafety-checking this `LocalDefId`.
677 query unsafety_check_result(key: LocalDefId) -> &'tcx mir::UnsafetyCheckResult {
678 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
679 cache_on_disk_if { true }
681 query unsafety_check_result_for_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::UnsafetyCheckResult {
683 |tcx| "unsafety-checking the const argument `{}`",
684 tcx.def_path_str(key.0.to_def_id())
688 /// Unsafety-check this `LocalDefId` with THIR unsafeck. This should be
689 /// used with `-Zthir-unsafeck`.
690 query thir_check_unsafety(key: LocalDefId) {
691 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
692 cache_on_disk_if { true }
694 query thir_check_unsafety_for_const_arg(key: (LocalDefId, DefId)) {
696 |tcx| "unsafety-checking the const argument `{}`",
697 tcx.def_path_str(key.0.to_def_id())
701 /// HACK: when evaluated, this reports an "unsafe derive on repr(packed)" error.
703 /// Unsafety checking is executed for each method separately, but we only want
704 /// to emit this error once per derive. As there are some impls with multiple
705 /// methods, we use a query for deduplication.
706 query unsafe_derive_on_repr_packed(key: LocalDefId) -> () {
707 desc { |tcx| "processing `{}`", tcx.def_path_str(key.to_def_id()) }
710 /// Computes the signature of the function.
711 query fn_sig(key: DefId) -> ty::PolyFnSig<'tcx> {
712 desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }
713 separate_provide_extern
716 /// Performs lint checking for the module.
717 query lint_mod(key: LocalDefId) -> () {
718 desc { |tcx| "linting {}", describe_as_module(key, tcx) }
721 /// Checks the attributes in the module.
722 query check_mod_attrs(key: LocalDefId) -> () {
723 desc { |tcx| "checking attributes in {}", describe_as_module(key, tcx) }
726 /// Checks for uses of unstable APIs in the module.
727 query check_mod_unstable_api_usage(key: LocalDefId) -> () {
728 desc { |tcx| "checking for unstable API usage in {}", describe_as_module(key, tcx) }
731 /// Checks the const bodies in the module for illegal operations (e.g. `if` or `loop`).
732 query check_mod_const_bodies(key: LocalDefId) -> () {
733 desc { |tcx| "checking consts in {}", describe_as_module(key, tcx) }
736 /// Checks the loops in the module.
737 query check_mod_loops(key: LocalDefId) -> () {
738 desc { |tcx| "checking loops in {}", describe_as_module(key, tcx) }
741 query check_mod_naked_functions(key: LocalDefId) -> () {
742 desc { |tcx| "checking naked functions in {}", describe_as_module(key, tcx) }
745 query check_mod_item_types(key: LocalDefId) -> () {
746 desc { |tcx| "checking item types in {}", describe_as_module(key, tcx) }
749 query check_mod_privacy(key: LocalDefId) -> () {
750 desc { |tcx| "checking privacy in {}", describe_as_module(key, tcx) }
753 query check_mod_intrinsics(key: LocalDefId) -> () {
754 desc { |tcx| "checking intrinsics in {}", describe_as_module(key, tcx) }
757 query check_mod_liveness(key: LocalDefId) -> () {
758 desc { |tcx| "checking liveness of variables in {}", describe_as_module(key, tcx) }
761 query check_mod_impl_wf(key: LocalDefId) -> () {
762 desc { |tcx| "checking that impls are well-formed in {}", describe_as_module(key, tcx) }
765 query collect_mod_item_types(key: LocalDefId) -> () {
766 desc { |tcx| "collecting item types in {}", describe_as_module(key, tcx) }
769 /// Caches `CoerceUnsized` kinds for impls on custom types.
770 query coerce_unsized_info(key: DefId) -> ty::adjustment::CoerceUnsizedInfo {
771 desc { |tcx| "computing CoerceUnsized info for `{}`", tcx.def_path_str(key) }
772 separate_provide_extern
775 query typeck_item_bodies(_: ()) -> () {
776 desc { "type-checking all item bodies" }
779 query typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
780 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
781 cache_on_disk_if { true }
783 query typeck_const_arg(
784 key: (LocalDefId, DefId)
785 ) -> &'tcx ty::TypeckResults<'tcx> {
787 |tcx| "type-checking the const argument `{}`",
788 tcx.def_path_str(key.0.to_def_id()),
791 query diagnostic_only_typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
792 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
793 cache_on_disk_if { true }
794 load_cached(tcx, id) {
795 let typeck_results: Option<ty::TypeckResults<'tcx>> = tcx
796 .on_disk_cache().as_ref()
797 .and_then(|c| c.try_load_query_result(*tcx, id));
799 typeck_results.map(|x| &*tcx.arena.alloc(x))
803 query used_trait_imports(key: LocalDefId) -> &'tcx FxHashSet<LocalDefId> {
804 desc { |tcx| "used_trait_imports `{}`", tcx.def_path_str(key.to_def_id()) }
805 cache_on_disk_if { true }
808 query has_typeck_results(def_id: DefId) -> bool {
809 desc { |tcx| "checking whether `{}` has a body", tcx.def_path_str(def_id) }
812 query coherent_trait(def_id: DefId) -> () {
813 desc { |tcx| "coherence checking all impls of trait `{}`", tcx.def_path_str(def_id) }
816 /// Borrow-checks the function body. If this is a closure, returns
817 /// additional requirements that the closure's creator must verify.
818 query mir_borrowck(key: LocalDefId) -> &'tcx mir::BorrowCheckResult<'tcx> {
819 desc { |tcx| "borrow-checking `{}`", tcx.def_path_str(key.to_def_id()) }
820 cache_on_disk_if(tcx) { tcx.is_typeck_child(key.to_def_id()) }
822 query mir_borrowck_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::BorrowCheckResult<'tcx> {
824 |tcx| "borrow-checking the const argument`{}`",
825 tcx.def_path_str(key.0.to_def_id())
829 /// Gets a complete map from all types to their inherent impls.
830 /// Not meant to be used directly outside of coherence.
831 query crate_inherent_impls(k: ()) -> CrateInherentImpls {
832 storage(ArenaCacheSelector<'tcx>)
833 desc { "all inherent impls defined in crate" }
836 /// Checks all types in the crate for overlap in their inherent impls. Reports errors.
837 /// Not meant to be used directly outside of coherence.
838 query crate_inherent_impls_overlap_check(_: ()) -> () {
839 desc { "check for overlap between inherent impls defined in this crate" }
842 /// Checks whether all impls in the crate pass the overlap check, returning
843 /// which impls fail it. If all impls are correct, the returned slice is empty.
844 query orphan_check_crate(_: ()) -> &'tcx [LocalDefId] {
846 "checking whether the immpl in the this crate follow the orphan rules",
850 /// Check whether the function has any recursion that could cause the inliner to trigger
851 /// a cycle. Returns the call stack causing the cycle. The call stack does not contain the
852 /// current function, just all intermediate functions.
853 query mir_callgraph_reachable(key: (ty::Instance<'tcx>, LocalDefId)) -> bool {
856 "computing if `{}` (transitively) calls `{}`",
858 tcx.def_path_str(key.1.to_def_id()),
862 /// Obtain all the calls into other local functions
863 query mir_inliner_callees(key: ty::InstanceDef<'tcx>) -> &'tcx [(DefId, SubstsRef<'tcx>)] {
866 "computing all local function calls in `{}`",
867 tcx.def_path_str(key.def_id()),
871 /// Evaluates a constant and returns the computed allocation.
873 /// **Do not use this** directly, use the `tcx.eval_static_initializer` wrapper.
874 query eval_to_allocation_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
875 -> EvalToAllocationRawResult<'tcx> {
877 "const-evaluating + checking `{}`",
878 key.value.display(tcx)
880 cache_on_disk_if { true }
883 /// Evaluates const items or anonymous constants
884 /// (such as enum variant explicit discriminants or array lengths)
885 /// into a representation suitable for the type system and const generics.
887 /// **Do not use this** directly, use one of the following wrappers: `tcx.const_eval_poly`,
888 /// `tcx.const_eval_resolve`, `tcx.const_eval_instance`, or `tcx.const_eval_global_id`.
889 query eval_to_const_value_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
890 -> EvalToConstValueResult<'tcx> {
892 "simplifying constant for the type system `{}`",
893 key.value.display(tcx)
895 cache_on_disk_if { true }
898 /// Convert an evaluated constant to a type level constant or
899 /// return `None` if that is not possible.
900 query const_to_valtree(
901 key: ty::ParamEnvAnd<'tcx, ConstAlloc<'tcx>>
902 ) -> Option<ty::ValTree<'tcx>> {
903 desc { "destructure constant" }
907 /// Destructure a constant ADT or array into its variant index and its
909 query destructure_const(
910 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
911 ) -> mir::DestructuredConst<'tcx> {
912 desc { "destructure constant" }
916 /// Dereference a constant reference or raw pointer and turn the result into a constant
919 key: ty::ParamEnvAnd<'tcx, &'tcx ty::Const<'tcx>>
920 ) -> &'tcx ty::Const<'tcx> {
921 desc { "deref constant" }
925 query const_caller_location(key: (rustc_span::Symbol, u32, u32)) -> ConstValue<'tcx> {
926 desc { "get a &core::panic::Location referring to a span" }
930 key: LitToConstInput<'tcx>
931 ) -> Result<&'tcx ty::Const<'tcx>, LitToConstError> {
932 desc { "converting literal to const" }
935 query check_match(key: DefId) {
936 desc { |tcx| "match-checking `{}`", tcx.def_path_str(key) }
937 cache_on_disk_if { key.is_local() }
940 /// Performs part of the privacy check and computes "access levels".
941 query privacy_access_levels(_: ()) -> &'tcx AccessLevels {
943 desc { "privacy access levels" }
945 query check_private_in_public(_: ()) -> () {
947 desc { "checking for private elements in public interfaces" }
950 query reachable_set(_: ()) -> FxHashSet<LocalDefId> {
951 storage(ArenaCacheSelector<'tcx>)
952 desc { "reachability" }
955 /// Per-body `region::ScopeTree`. The `DefId` should be the owner `DefId` for the body;
956 /// in the case of closures, this will be redirected to the enclosing function.
957 query region_scope_tree(def_id: DefId) -> &'tcx region::ScopeTree {
958 desc { |tcx| "computing drop scopes for `{}`", tcx.def_path_str(def_id) }
961 /// Generates a MIR body for the shim.
962 query mir_shims(key: ty::InstanceDef<'tcx>) -> mir::Body<'tcx> {
963 storage(ArenaCacheSelector<'tcx>)
964 desc { |tcx| "generating MIR shim for `{}`", tcx.def_path_str(key.def_id()) }
967 /// The `symbol_name` query provides the symbol name for calling a
968 /// given instance from the local crate. In particular, it will also
969 /// look up the correct symbol name of instances from upstream crates.
970 query symbol_name(key: ty::Instance<'tcx>) -> ty::SymbolName<'tcx> {
971 desc { "computing the symbol for `{}`", key }
972 cache_on_disk_if { true }
975 query opt_def_kind(def_id: DefId) -> Option<DefKind> {
976 desc { |tcx| "looking up definition kind of `{}`", tcx.def_path_str(def_id) }
977 separate_provide_extern
980 /// Gets the span for the definition.
981 query def_span(def_id: DefId) -> Span {
982 desc { |tcx| "looking up span for `{}`", tcx.def_path_str(def_id) }
983 separate_provide_extern
986 /// Gets the span for the identifier of the definition.
987 query def_ident_span(def_id: DefId) -> Option<Span> {
988 desc { |tcx| "looking up span for `{}`'s identifier", tcx.def_path_str(def_id) }
989 separate_provide_extern
992 query lookup_stability(def_id: DefId) -> Option<&'tcx attr::Stability> {
993 desc { |tcx| "looking up stability of `{}`", tcx.def_path_str(def_id) }
994 separate_provide_extern
997 query lookup_const_stability(def_id: DefId) -> Option<&'tcx attr::ConstStability> {
998 desc { |tcx| "looking up const stability of `{}`", tcx.def_path_str(def_id) }
999 separate_provide_extern
1002 query should_inherit_track_caller(def_id: DefId) -> bool {
1003 desc { |tcx| "computing should_inherit_track_caller of `{}`", tcx.def_path_str(def_id) }
1006 query lookup_deprecation_entry(def_id: DefId) -> Option<DeprecationEntry> {
1007 desc { |tcx| "checking whether `{}` is deprecated", tcx.def_path_str(def_id) }
1008 separate_provide_extern
1011 query item_attrs(def_id: DefId) -> &'tcx [ast::Attribute] {
1012 desc { |tcx| "collecting attributes of `{}`", tcx.def_path_str(def_id) }
1013 separate_provide_extern
1016 query codegen_fn_attrs(def_id: DefId) -> CodegenFnAttrs {
1017 desc { |tcx| "computing codegen attributes of `{}`", tcx.def_path_str(def_id) }
1018 storage(ArenaCacheSelector<'tcx>)
1019 cache_on_disk_if { true }
1022 query fn_arg_names(def_id: DefId) -> &'tcx [rustc_span::symbol::Ident] {
1023 desc { |tcx| "looking up function parameter names for `{}`", tcx.def_path_str(def_id) }
1024 separate_provide_extern
1026 /// Gets the rendered value of the specified constant or associated constant.
1027 /// Used by rustdoc.
1028 query rendered_const(def_id: DefId) -> String {
1029 desc { |tcx| "rendering constant intializer of `{}`", tcx.def_path_str(def_id) }
1030 separate_provide_extern
1032 query impl_parent(def_id: DefId) -> Option<DefId> {
1033 desc { |tcx| "computing specialization parent impl of `{}`", tcx.def_path_str(def_id) }
1034 separate_provide_extern
1037 /// Given an `associated_item`, find the trait it belongs to.
1038 /// Return `None` if the `DefId` is not an associated item.
1039 query trait_of_item(associated_item: DefId) -> Option<DefId> {
1040 desc { |tcx| "finding trait defining `{}`", tcx.def_path_str(associated_item) }
1041 separate_provide_extern
1044 query is_ctfe_mir_available(key: DefId) -> bool {
1045 desc { |tcx| "checking if item has ctfe mir available: `{}`", tcx.def_path_str(key) }
1046 separate_provide_extern
1048 query is_mir_available(key: DefId) -> bool {
1049 desc { |tcx| "checking if item has mir available: `{}`", tcx.def_path_str(key) }
1050 separate_provide_extern
1053 query own_existential_vtable_entries(
1054 key: ty::PolyExistentialTraitRef<'tcx>
1055 ) -> &'tcx [DefId] {
1056 desc { |tcx| "finding all existential vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1059 query vtable_entries(key: ty::PolyTraitRef<'tcx>)
1060 -> &'tcx [ty::VtblEntry<'tcx>] {
1061 desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1064 query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::Ty<'tcx>, ty::Ty<'tcx>)) -> Option<usize> {
1065 desc { |tcx| "finding the slot within vtable for trait object {} vtable ptr during trait upcasting coercion from {} vtable",
1069 query vtable_allocation(key: (Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>)) -> mir::interpret::AllocId {
1070 desc { |tcx| "vtable const allocation for <{} as {}>",
1072 key.1.map(|trait_ref| format!("{}", trait_ref)).unwrap_or("_".to_owned())
1076 query codegen_fulfill_obligation(
1077 key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
1078 ) -> Result<ImplSource<'tcx, ()>, ErrorReported> {
1079 cache_on_disk_if { true }
1081 "checking if `{}` fulfills its obligations",
1082 tcx.def_path_str(key.1.def_id())
1086 /// Return all `impl` blocks in the current crate.
1087 query all_local_trait_impls(_: ()) -> &'tcx BTreeMap<DefId, Vec<LocalDefId>> {
1088 desc { "local trait impls" }
1091 /// Given a trait `trait_id`, return all known `impl` blocks.
1092 query trait_impls_of(trait_id: DefId) -> ty::trait_def::TraitImpls {
1093 storage(ArenaCacheSelector<'tcx>)
1094 desc { |tcx| "trait impls of `{}`", tcx.def_path_str(trait_id) }
1097 query specialization_graph_of(trait_id: DefId) -> specialization_graph::Graph {
1098 storage(ArenaCacheSelector<'tcx>)
1099 desc { |tcx| "building specialization graph of trait `{}`", tcx.def_path_str(trait_id) }
1100 cache_on_disk_if { true }
1102 query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
1103 desc { |tcx| "determine object safety of trait `{}`", tcx.def_path_str(trait_id) }
1106 /// Gets the ParameterEnvironment for a given item; this environment
1107 /// will be in "user-facing" mode, meaning that it is suitable for
1108 /// type-checking etc, and it does not normalize specializable
1109 /// associated types. This is almost always what you want,
1110 /// unless you are doing MIR optimizations, in which case you
1111 /// might want to use `reveal_all()` method to change modes.
1112 query param_env(def_id: DefId) -> ty::ParamEnv<'tcx> {
1113 desc { |tcx| "computing normalized predicates of `{}`", tcx.def_path_str(def_id) }
1116 /// Like `param_env`, but returns the `ParamEnv` in `Reveal::All` mode.
1117 /// Prefer this over `tcx.param_env(def_id).with_reveal_all_normalized(tcx)`,
1118 /// as this method is more efficient.
1119 query param_env_reveal_all_normalized(def_id: DefId) -> ty::ParamEnv<'tcx> {
1120 desc { |tcx| "computing revealed normalized predicates of `{}`", tcx.def_path_str(def_id) }
1123 /// Trait selection queries. These are best used by invoking `ty.is_copy_modulo_regions()`,
1124 /// `ty.is_copy()`, etc, since that will prune the environment where possible.
1125 query is_copy_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1126 desc { "computing whether `{}` is `Copy`", env.value }
1129 /// Query backing `TyS::is_sized`.
1130 query is_sized_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1131 desc { "computing whether `{}` is `Sized`", env.value }
1134 /// Query backing `TyS::is_freeze`.
1135 query is_freeze_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1136 desc { "computing whether `{}` is freeze", env.value }
1139 /// Query backing `TyS::is_unpin`.
1140 query is_unpin_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1141 desc { "computing whether `{}` is `Unpin`", env.value }
1144 /// Query backing `TyS::needs_drop`.
1145 query needs_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1146 desc { "computing whether `{}` needs drop", env.value }
1149 /// Query backing `TyS::has_significant_drop_raw`.
1150 query has_significant_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1151 desc { "computing whether `{}` has a significant drop", env.value }
1155 /// Query backing `TyS::is_structural_eq_shallow`.
1157 /// This is only correct for ADTs. Call `is_structural_eq_shallow` to handle all types
1159 query has_structural_eq_impls(ty: Ty<'tcx>) -> bool {
1161 "computing whether `{:?}` implements `PartialStructuralEq` and `StructuralEq`",
1166 /// A list of types where the ADT requires drop if and only if any of
1167 /// those types require drop. If the ADT is known to always need drop
1168 /// then `Err(AlwaysRequiresDrop)` is returned.
1169 query adt_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1170 desc { |tcx| "computing when `{}` needs drop", tcx.def_path_str(def_id) }
1171 cache_on_disk_if { true }
1174 /// A list of types where the ADT requires drop if and only if any of those types
1175 /// has significant drop. A type marked with the attribute `rustc_insignificant_dtor`
1176 /// is considered to not be significant. A drop is significant if it is implemented
1177 /// by the user or does anything that will have any observable behavior (other than
1178 /// freeing up memory). If the ADT is known to have a significant destructor then
1179 /// `Err(AlwaysRequiresDrop)` is returned.
1180 query adt_significant_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1181 desc { |tcx| "computing when `{}` has a significant destructor", tcx.def_path_str(def_id) }
1182 cache_on_disk_if { false }
1185 /// Computes the layout of a type. Note that this implicitly
1186 /// executes in "reveal all" mode, and will normalize the input type.
1188 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1189 ) -> Result<ty::layout::TyAndLayout<'tcx>, ty::layout::LayoutError<'tcx>> {
1190 desc { "computing layout of `{}`", key.value }
1194 /// Compute a `FnAbi` suitable for indirect calls, i.e. to `fn` pointers.
1196 /// NB: this doesn't handle virtual calls - those should use `fn_abi_of_instance`
1197 /// instead, where the instance is an `InstanceDef::Virtual`.
1198 query fn_abi_of_fn_ptr(
1199 key: ty::ParamEnvAnd<'tcx, (ty::PolyFnSig<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1200 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1201 desc { "computing call ABI of `{}` function pointers", key.value.0 }
1205 /// Compute a `FnAbi` suitable for declaring/defining an `fn` instance, and for
1206 /// direct calls to an `fn`.
1208 /// NB: that includes virtual calls, which are represented by "direct calls"
1209 /// to an `InstanceDef::Virtual` instance (of `<dyn Trait as Trait>::fn`).
1210 query fn_abi_of_instance(
1211 key: ty::ParamEnvAnd<'tcx, (ty::Instance<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1212 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1213 desc { "computing call ABI of `{}`", key.value.0 }
1217 query dylib_dependency_formats(_: CrateNum)
1218 -> &'tcx [(CrateNum, LinkagePreference)] {
1219 desc { "dylib dependency formats of crate" }
1220 separate_provide_extern
1223 query dependency_formats(_: ()) -> Lrc<crate::middle::dependency_format::Dependencies> {
1224 desc { "get the linkage format of all dependencies" }
1227 query is_compiler_builtins(_: CrateNum) -> bool {
1229 desc { "checking if the crate is_compiler_builtins" }
1230 separate_provide_extern
1232 query has_global_allocator(_: CrateNum) -> bool {
1233 // This query depends on untracked global state in CStore
1236 desc { "checking if the crate has_global_allocator" }
1237 separate_provide_extern
1239 query has_panic_handler(_: CrateNum) -> bool {
1241 desc { "checking if the crate has_panic_handler" }
1242 separate_provide_extern
1244 query is_profiler_runtime(_: CrateNum) -> bool {
1246 desc { "query a crate is `#![profiler_runtime]`" }
1247 separate_provide_extern
1249 query panic_strategy(_: CrateNum) -> PanicStrategy {
1251 desc { "query a crate's configured panic strategy" }
1252 separate_provide_extern
1254 query panic_in_drop_strategy(_: CrateNum) -> PanicStrategy {
1256 desc { "query a crate's configured panic-in-drop strategy" }
1257 separate_provide_extern
1259 query is_no_builtins(_: CrateNum) -> bool {
1261 desc { "test whether a crate has `#![no_builtins]`" }
1262 separate_provide_extern
1264 query symbol_mangling_version(_: CrateNum) -> SymbolManglingVersion {
1266 desc { "query a crate's symbol mangling version" }
1267 separate_provide_extern
1270 query extern_crate(def_id: DefId) -> Option<&'tcx ExternCrate> {
1272 desc { "getting crate's ExternCrateData" }
1273 separate_provide_extern
1276 query specializes(_: (DefId, DefId)) -> bool {
1277 desc { "computing whether impls specialize one another" }
1279 query in_scope_traits_map(_: LocalDefId)
1280 -> Option<&'tcx FxHashMap<ItemLocalId, Box<[TraitCandidate]>>> {
1281 desc { "traits in scope at a block" }
1284 query module_reexports(def_id: LocalDefId) -> Option<&'tcx [ModChild]> {
1285 desc { |tcx| "looking up reexports of module `{}`", tcx.def_path_str(def_id.to_def_id()) }
1288 query impl_defaultness(def_id: DefId) -> hir::Defaultness {
1289 desc { |tcx| "looking up whether `{}` is a default impl", tcx.def_path_str(def_id) }
1290 separate_provide_extern
1293 query impl_constness(def_id: DefId) -> hir::Constness {
1294 desc { |tcx| "looking up whether `{}` is a const impl", tcx.def_path_str(def_id) }
1295 separate_provide_extern
1298 query check_item_well_formed(key: LocalDefId) -> () {
1299 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1301 query check_trait_item_well_formed(key: LocalDefId) -> () {
1302 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1304 query check_impl_item_well_formed(key: LocalDefId) -> () {
1305 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1308 // The `DefId`s of all non-generic functions and statics in the given crate
1309 // that can be reached from outside the crate.
1311 // We expect this items to be available for being linked to.
1313 // This query can also be called for `LOCAL_CRATE`. In this case it will
1314 // compute which items will be reachable to other crates, taking into account
1315 // the kind of crate that is currently compiled. Crates with only a
1316 // C interface have fewer reachable things.
1318 // Does not include external symbols that don't have a corresponding DefId,
1319 // like the compiler-generated `main` function and so on.
1320 query reachable_non_generics(_: CrateNum)
1321 -> DefIdMap<SymbolExportLevel> {
1322 storage(ArenaCacheSelector<'tcx>)
1323 desc { "looking up the exported symbols of a crate" }
1324 separate_provide_extern
1326 query is_reachable_non_generic(def_id: DefId) -> bool {
1327 desc { |tcx| "checking whether `{}` is an exported symbol", tcx.def_path_str(def_id) }
1328 separate_provide_extern
1330 query is_unreachable_local_definition(def_id: LocalDefId) -> bool {
1332 "checking whether `{}` is reachable from outside the crate",
1333 tcx.def_path_str(def_id.to_def_id()),
1337 /// The entire set of monomorphizations the local crate can safely link
1338 /// to because they are exported from upstream crates. Do not depend on
1339 /// this directly, as its value changes anytime a monomorphization gets
1340 /// added or removed in any upstream crate. Instead use the narrower
1341 /// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
1342 /// better, `Instance::upstream_monomorphization()`.
1343 query upstream_monomorphizations(_: ()) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1344 storage(ArenaCacheSelector<'tcx>)
1345 desc { "collecting available upstream monomorphizations" }
1348 /// Returns the set of upstream monomorphizations available for the
1349 /// generic function identified by the given `def_id`. The query makes
1350 /// sure to make a stable selection if the same monomorphization is
1351 /// available in multiple upstream crates.
1353 /// You likely want to call `Instance::upstream_monomorphization()`
1354 /// instead of invoking this query directly.
1355 query upstream_monomorphizations_for(def_id: DefId)
1356 -> Option<&'tcx FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1358 "collecting available upstream monomorphizations for `{}`",
1359 tcx.def_path_str(def_id),
1361 separate_provide_extern
1364 /// Returns the upstream crate that exports drop-glue for the given
1365 /// type (`substs` is expected to be a single-item list containing the
1366 /// type one wants drop-glue for).
1368 /// This is a subset of `upstream_monomorphizations_for` in order to
1369 /// increase dep-tracking granularity. Otherwise adding or removing any
1370 /// type with drop-glue in any upstream crate would invalidate all
1371 /// functions calling drop-glue of an upstream type.
1373 /// You likely want to call `Instance::upstream_monomorphization()`
1374 /// instead of invoking this query directly.
1376 /// NOTE: This query could easily be extended to also support other
1377 /// common functions that have are large set of monomorphizations
1378 /// (like `Clone::clone` for example).
1379 query upstream_drop_glue_for(substs: SubstsRef<'tcx>) -> Option<CrateNum> {
1380 desc { "available upstream drop-glue for `{:?}`", substs }
1383 query foreign_modules(_: CrateNum) -> Lrc<FxHashMap<DefId, ForeignModule>> {
1384 desc { "looking up the foreign modules of a linked crate" }
1385 separate_provide_extern
1388 /// Identifies the entry-point (e.g., the `main` function) for a given
1389 /// crate, returning `None` if there is no entry point (such as for library crates).
1390 query entry_fn(_: ()) -> Option<(DefId, EntryFnType)> {
1391 desc { "looking up the entry function of a crate" }
1393 query proc_macro_decls_static(_: ()) -> Option<LocalDefId> {
1394 desc { "looking up the derive registrar for a crate" }
1396 // The macro which defines `rustc_metadata::provide_extern` depends on this query's name.
1397 // Changing the name should cause a compiler error, but in case that changes, be aware.
1398 query crate_hash(_: CrateNum) -> Svh {
1400 desc { "looking up the hash a crate" }
1401 separate_provide_extern
1403 query crate_host_hash(_: CrateNum) -> Option<Svh> {
1405 desc { "looking up the hash of a host version of a crate" }
1406 separate_provide_extern
1408 query extra_filename(_: CrateNum) -> String {
1410 desc { "looking up the extra filename for a crate" }
1411 separate_provide_extern
1413 query crate_extern_paths(_: CrateNum) -> Vec<PathBuf> {
1415 desc { "looking up the paths for extern crates" }
1416 separate_provide_extern
1419 /// Given a crate and a trait, look up all impls of that trait in the crate.
1420 /// Return `(impl_id, self_ty)`.
1421 query implementations_of_trait(_: (CrateNum, DefId)) -> &'tcx [(DefId, Option<SimplifiedType>)] {
1422 desc { "looking up implementations of a trait in a crate" }
1423 separate_provide_extern
1426 query is_dllimport_foreign_item(def_id: DefId) -> bool {
1427 desc { |tcx| "is_dllimport_foreign_item({})", tcx.def_path_str(def_id) }
1429 query is_statically_included_foreign_item(def_id: DefId) -> bool {
1430 desc { |tcx| "is_statically_included_foreign_item({})", tcx.def_path_str(def_id) }
1432 query native_library_kind(def_id: DefId)
1433 -> Option<NativeLibKind> {
1434 desc { |tcx| "native_library_kind({})", tcx.def_path_str(def_id) }
1437 /// Does lifetime resolution, but does not descend into trait items. This
1438 /// should only be used for resolving lifetimes of on trait definitions,
1439 /// and is used to avoid cycles. Importantly, `resolve_lifetimes` still visits
1440 /// the same lifetimes and is responsible for diagnostics.
1441 /// See `rustc_resolve::late::lifetimes for details.
1442 query resolve_lifetimes_trait_definition(_: LocalDefId) -> ResolveLifetimes {
1443 storage(ArenaCacheSelector<'tcx>)
1444 desc { "resolving lifetimes for a trait definition" }
1446 /// Does lifetime resolution on items. Importantly, we can't resolve
1447 /// lifetimes directly on things like trait methods, because of trait params.
1448 /// See `rustc_resolve::late::lifetimes for details.
1449 query resolve_lifetimes(_: LocalDefId) -> ResolveLifetimes {
1450 storage(ArenaCacheSelector<'tcx>)
1451 desc { "resolving lifetimes" }
1453 query named_region_map(_: LocalDefId) ->
1454 Option<&'tcx FxHashMap<ItemLocalId, Region>> {
1455 desc { "looking up a named region" }
1457 query is_late_bound_map(_: LocalDefId) ->
1458 Option<(LocalDefId, &'tcx FxHashSet<ItemLocalId>)> {
1459 desc { "testing if a region is late bound" }
1461 /// For a given item (like a struct), gets the default lifetimes to be used
1462 /// for each parameter if a trait object were to be passed for that parameter.
1463 /// For example, for `struct Foo<'a, T, U>`, this would be `['static, 'static]`.
1464 /// For `struct Foo<'a, T: 'a, U>`, this would instead be `['a, 'static]`.
1465 query object_lifetime_defaults_map(_: LocalDefId)
1466 -> Option<Vec<ObjectLifetimeDefault>> {
1467 desc { "looking up lifetime defaults for a region on an item" }
1469 query late_bound_vars_map(_: LocalDefId)
1470 -> Option<&'tcx FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
1471 desc { "looking up late bound vars" }
1474 query lifetime_scope_map(_: LocalDefId) -> Option<FxHashMap<ItemLocalId, LifetimeScopeForPath>> {
1475 desc { "finds the lifetime scope for an HirId of a PathSegment" }
1478 query visibility(def_id: DefId) -> ty::Visibility {
1479 desc { |tcx| "computing visibility of `{}`", tcx.def_path_str(def_id) }
1480 separate_provide_extern
1483 /// Computes the set of modules from which this type is visibly uninhabited.
1484 /// To check whether a type is uninhabited at all (not just from a given module), you could
1485 /// check whether the forest is empty.
1486 query type_uninhabited_from(
1487 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1488 ) -> ty::inhabitedness::DefIdForest {
1489 desc { "computing the inhabitedness of `{:?}`", key }
1493 query dep_kind(_: CrateNum) -> CrateDepKind {
1495 desc { "fetching what a dependency looks like" }
1496 separate_provide_extern
1499 /// Gets the name of the crate.
1500 query crate_name(_: CrateNum) -> Symbol {
1502 desc { "fetching what a crate is named" }
1503 separate_provide_extern
1505 query module_children(def_id: DefId) -> &'tcx [ModChild] {
1506 desc { |tcx| "collecting child items of module `{}`", tcx.def_path_str(def_id) }
1507 separate_provide_extern
1509 query extern_mod_stmt_cnum(def_id: LocalDefId) -> Option<CrateNum> {
1510 desc { |tcx| "computing crate imported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1513 query lib_features(_: ()) -> LibFeatures {
1514 storage(ArenaCacheSelector<'tcx>)
1515 desc { "calculating the lib features map" }
1517 query defined_lib_features(_: CrateNum)
1518 -> &'tcx [(Symbol, Option<Symbol>)] {
1519 desc { "calculating the lib features defined in a crate" }
1520 separate_provide_extern
1522 /// Returns the lang items defined in another crate by loading it from metadata.
1523 query get_lang_items(_: ()) -> LanguageItems {
1524 storage(ArenaCacheSelector<'tcx>)
1526 desc { "calculating the lang items map" }
1529 /// Returns all diagnostic items defined in all crates.
1530 query all_diagnostic_items(_: ()) -> rustc_hir::diagnostic_items::DiagnosticItems {
1531 storage(ArenaCacheSelector<'tcx>)
1533 desc { "calculating the diagnostic items map" }
1536 /// Returns the lang items defined in another crate by loading it from metadata.
1537 query defined_lang_items(_: CrateNum) -> &'tcx [(DefId, usize)] {
1538 desc { "calculating the lang items defined in a crate" }
1539 separate_provide_extern
1542 /// Returns the diagnostic items defined in a crate.
1543 query diagnostic_items(_: CrateNum) -> rustc_hir::diagnostic_items::DiagnosticItems {
1544 storage(ArenaCacheSelector<'tcx>)
1545 desc { "calculating the diagnostic items map in a crate" }
1546 separate_provide_extern
1549 query missing_lang_items(_: CrateNum) -> &'tcx [LangItem] {
1550 desc { "calculating the missing lang items in a crate" }
1551 separate_provide_extern
1553 query visible_parent_map(_: ()) -> Lrc<DefIdMap<DefId>> {
1554 desc { "calculating the visible parent map" }
1556 query trimmed_def_paths(_: ()) -> FxHashMap<DefId, Symbol> {
1557 storage(ArenaCacheSelector<'tcx>)
1558 desc { "calculating trimmed def paths" }
1560 query missing_extern_crate_item(_: CrateNum) -> bool {
1562 desc { "seeing if we're missing an `extern crate` item for this crate" }
1563 separate_provide_extern
1565 query used_crate_source(_: CrateNum) -> Lrc<CrateSource> {
1567 desc { "looking at the source for a crate" }
1568 separate_provide_extern
1570 query postorder_cnums(_: ()) -> &'tcx [CrateNum] {
1572 desc { "generating a postorder list of CrateNums" }
1574 /// Returns whether or not the crate with CrateNum 'cnum'
1575 /// is marked as a private dependency
1576 query is_private_dep(c: CrateNum) -> bool {
1578 desc { "check whether crate {} is a private dependency", c }
1579 separate_provide_extern
1581 query allocator_kind(_: ()) -> Option<AllocatorKind> {
1583 desc { "allocator kind for the current crate" }
1586 query upvars_mentioned(def_id: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
1587 desc { |tcx| "collecting upvars mentioned in `{}`", tcx.def_path_str(def_id) }
1589 query maybe_unused_trait_import(def_id: LocalDefId) -> bool {
1590 desc { |tcx| "maybe_unused_trait_import for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1592 query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
1593 desc { "looking up all possibly unused extern crates" }
1595 query names_imported_by_glob_use(def_id: LocalDefId) -> &'tcx FxHashSet<Symbol> {
1596 desc { |tcx| "names_imported_by_glob_use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1599 query stability_index(_: ()) -> stability::Index<'tcx> {
1600 storage(ArenaCacheSelector<'tcx>)
1602 desc { "calculating the stability index for the local crate" }
1604 query crates(_: ()) -> &'tcx [CrateNum] {
1606 desc { "fetching all foreign CrateNum instances" }
1609 /// A list of all traits in a crate, used by rustdoc and error reporting.
1610 /// NOTE: Not named just `traits` due to a naming conflict.
1611 query traits_in_crate(_: CrateNum) -> &'tcx [DefId] {
1612 desc { "fetching all traits in a crate" }
1613 separate_provide_extern
1616 /// The list of symbols exported from the given crate.
1618 /// - All names contained in `exported_symbols(cnum)` are guaranteed to
1619 /// correspond to a publicly visible symbol in `cnum` machine code.
1620 /// - The `exported_symbols` sets of different crates do not intersect.
1621 query exported_symbols(_: CrateNum)
1622 -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1623 desc { "exported_symbols" }
1624 separate_provide_extern
1627 query collect_and_partition_mono_items(_: ()) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
1629 desc { "collect_and_partition_mono_items" }
1631 query is_codegened_item(def_id: DefId) -> bool {
1632 desc { |tcx| "determining whether `{}` needs codegen", tcx.def_path_str(def_id) }
1635 /// All items participating in code generation together with items inlined into them.
1636 query codegened_and_inlined_items(_: ()) -> &'tcx DefIdSet {
1638 desc { "codegened_and_inlined_items" }
1641 query codegen_unit(_: Symbol) -> &'tcx CodegenUnit<'tcx> {
1642 desc { "codegen_unit" }
1644 query unused_generic_params(key: ty::InstanceDef<'tcx>) -> FiniteBitSet<u32> {
1645 cache_on_disk_if { key.def_id().is_local() }
1647 |tcx| "determining which generic parameters are unused by `{}`",
1648 tcx.def_path_str(key.def_id())
1650 separate_provide_extern
1652 query backend_optimization_level(_: ()) -> OptLevel {
1653 desc { "optimization level used by backend" }
1656 query output_filenames(_: ()) -> Arc<OutputFilenames> {
1658 desc { "output_filenames" }
1661 /// Do not call this query directly: invoke `normalize` instead.
1662 query normalize_projection_ty(
1663 goal: CanonicalProjectionGoal<'tcx>
1665 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, NormalizationResult<'tcx>>>,
1668 desc { "normalizing `{:?}`", goal }
1672 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1673 query try_normalize_generic_arg_after_erasing_regions(
1674 goal: ParamEnvAnd<'tcx, GenericArg<'tcx>>
1675 ) -> Result<GenericArg<'tcx>, NoSolution> {
1676 desc { "normalizing `{}`", goal.value }
1680 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1681 query try_normalize_mir_const_after_erasing_regions(
1682 goal: ParamEnvAnd<'tcx, mir::ConstantKind<'tcx>>
1683 ) -> Result<mir::ConstantKind<'tcx>, NoSolution> {
1684 desc { "normalizing `{}`", goal.value }
1688 query implied_outlives_bounds(
1689 goal: CanonicalTyGoal<'tcx>
1691 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Vec<OutlivesBound<'tcx>>>>,
1694 desc { "computing implied outlives bounds for `{:?}`", goal }
1698 /// Do not call this query directly: invoke `infcx.at().dropck_outlives()` instead.
1699 query dropck_outlives(
1700 goal: CanonicalTyGoal<'tcx>
1702 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>,
1705 desc { "computing dropck types for `{:?}`", goal }
1709 /// Do not call this query directly: invoke `infcx.predicate_may_hold()` or
1710 /// `infcx.predicate_must_hold()` instead.
1711 query evaluate_obligation(
1712 goal: CanonicalPredicateGoal<'tcx>
1713 ) -> Result<traits::EvaluationResult, traits::OverflowError> {
1714 desc { "evaluating trait selection obligation `{}`", goal.value.value }
1717 query evaluate_goal(
1718 goal: traits::CanonicalChalkEnvironmentAndGoal<'tcx>
1720 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1723 desc { "evaluating trait selection obligation `{}`", goal.value }
1726 /// Do not call this query directly: part of the `Eq` type-op
1727 query type_op_ascribe_user_type(
1728 goal: CanonicalTypeOpAscribeUserTypeGoal<'tcx>
1730 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1733 desc { "evaluating `type_op_ascribe_user_type` `{:?}`", goal }
1737 /// Do not call this query directly: part of the `Eq` type-op
1739 goal: CanonicalTypeOpEqGoal<'tcx>
1741 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1744 desc { "evaluating `type_op_eq` `{:?}`", goal }
1748 /// Do not call this query directly: part of the `Subtype` type-op
1749 query type_op_subtype(
1750 goal: CanonicalTypeOpSubtypeGoal<'tcx>
1752 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1755 desc { "evaluating `type_op_subtype` `{:?}`", goal }
1759 /// Do not call this query directly: part of the `ProvePredicate` type-op
1760 query type_op_prove_predicate(
1761 goal: CanonicalTypeOpProvePredicateGoal<'tcx>
1763 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1766 desc { "evaluating `type_op_prove_predicate` `{:?}`", goal }
1769 /// Do not call this query directly: part of the `Normalize` type-op
1770 query type_op_normalize_ty(
1771 goal: CanonicalTypeOpNormalizeGoal<'tcx, Ty<'tcx>>
1773 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Ty<'tcx>>>,
1776 desc { "normalizing `{:?}`", goal }
1780 /// Do not call this query directly: part of the `Normalize` type-op
1781 query type_op_normalize_predicate(
1782 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::Predicate<'tcx>>
1784 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::Predicate<'tcx>>>,
1787 desc { "normalizing `{:?}`", goal }
1791 /// Do not call this query directly: part of the `Normalize` type-op
1792 query type_op_normalize_poly_fn_sig(
1793 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::PolyFnSig<'tcx>>
1795 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::PolyFnSig<'tcx>>>,
1798 desc { "normalizing `{:?}`", goal }
1802 /// Do not call this query directly: part of the `Normalize` type-op
1803 query type_op_normalize_fn_sig(
1804 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::FnSig<'tcx>>
1806 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::FnSig<'tcx>>>,
1809 desc { "normalizing `{:?}`", goal }
1813 query subst_and_check_impossible_predicates(key: (DefId, SubstsRef<'tcx>)) -> bool {
1815 "impossible substituted predicates:`{}`",
1816 tcx.def_path_str(key.0)
1820 query method_autoderef_steps(
1821 goal: CanonicalTyGoal<'tcx>
1822 ) -> MethodAutoderefStepsResult<'tcx> {
1823 desc { "computing autoderef types for `{:?}`", goal }
1827 query supported_target_features(_: CrateNum) -> FxHashMap<String, Option<Symbol>> {
1828 storage(ArenaCacheSelector<'tcx>)
1830 desc { "looking up supported target features" }
1833 /// Get an estimate of the size of an InstanceDef based on its MIR for CGU partitioning.
1834 query instance_def_size_estimate(def: ty::InstanceDef<'tcx>)
1836 desc { |tcx| "estimating size for `{}`", tcx.def_path_str(def.def_id()) }
1839 query features_query(_: ()) -> &'tcx rustc_feature::Features {
1841 desc { "looking up enabled feature gates" }
1844 /// Attempt to resolve the given `DefId` to an `Instance`, for the
1845 /// given generics args (`SubstsRef`), returning one of:
1846 /// * `Ok(Some(instance))` on success
1847 /// * `Ok(None)` when the `SubstsRef` are still too generic,
1848 /// and therefore don't allow finding the final `Instance`
1849 /// * `Err(ErrorReported)` when the `Instance` resolution process
1850 /// couldn't complete due to errors elsewhere - this is distinct
1851 /// from `Ok(None)` to avoid misleading diagnostics when an error
1852 /// has already been/will be emitted, for the original cause
1853 query resolve_instance(
1854 key: ty::ParamEnvAnd<'tcx, (DefId, SubstsRef<'tcx>)>
1855 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1856 desc { "resolving instance `{}`", ty::Instance::new(key.value.0, key.value.1) }
1860 query resolve_instance_of_const_arg(
1861 key: ty::ParamEnvAnd<'tcx, (LocalDefId, DefId, SubstsRef<'tcx>)>
1862 ) -> Result<Option<ty::Instance<'tcx>>, ErrorReported> {
1864 "resolving instance of the const argument `{}`",
1865 ty::Instance::new(key.value.0.to_def_id(), key.value.2),
1870 query normalize_opaque_types(key: &'tcx ty::List<ty::Predicate<'tcx>>) -> &'tcx ty::List<ty::Predicate<'tcx>> {
1871 desc { "normalizing opaque types in {:?}", key }
1874 /// Checks whether a type is definitely uninhabited. This is
1875 /// conservative: for some types that are uninhabited we return `false`,
1876 /// but we only return `true` for types that are definitely uninhabited.
1877 /// `ty.conservative_is_privately_uninhabited` implies that any value of type `ty`
1878 /// will be `Abi::Uninhabited`. (Note that uninhabited types may have nonzero
1879 /// size, to account for partial initialisation. See #49298 for details.)
1880 query conservative_is_privately_uninhabited(key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1881 desc { "conservatively checking if {:?} is privately uninhabited", key }
1885 query limits(key: ()) -> Limits {
1886 desc { "looking up limits" }
1889 /// Performs an HIR-based well-formed check on the item with the given `HirId`. If
1890 /// we get an `Unimplemented` error that matches the provided `Predicate`, return
1891 /// the cause of the newly created obligation.
1893 /// This is only used by error-reporting code to get a better cause (in particular, a better
1894 /// span) for an *existing* error. Therefore, it is best-effort, and may never handle
1895 /// all of the cases that the normal `ty::Ty`-based wfcheck does. This is fine,
1896 /// because the `ty::Ty`-based wfcheck is always run.
1897 query diagnostic_hir_wf_check(key: (ty::Predicate<'tcx>, traits::WellFormedLoc)) -> Option<traits::ObligationCause<'tcx>> {
1900 desc { "performing HIR wf-checking for predicate {:?} at item {:?}", key.0, key.1 }