1 //! Defines the various compiler queries.
3 //! For more information on the query system, see
4 //! ["Queries: demand-driven compilation"](https://rustc-dev-guide.rust-lang.org/query.html).
5 //! This chapter includes instructions for adding new queries.
7 // Each of these queries corresponds to a function pointer field in the
8 // `Providers` struct for requesting a value of that type, and a method
9 // on `tcx: TyCtxt` (and `tcx.at(span)`) for doing that request in a way
10 // which memoizes and does dep-graph tracking, wrapping around the actual
11 // `Providers` that the driver creates (using several `rustc_*` crates).
13 // The result type of each query must implement `Clone`, and additionally
14 // `ty::query::values::Value`, which produces an appropriate placeholder
15 // (error) value if the query resulted in a query cycle.
16 // Queries marked with `fatal_cycle` do not need the latter implementation,
17 // as they will raise an fatal error on query cycles instead.
19 query trigger_delay_span_bug(key: DefId) -> () {
20 desc { "trigger a delay span bug" }
23 query resolutions(_: ()) -> &'tcx ty::ResolverOutputs {
26 desc { "get the resolver outputs" }
29 /// Return the span for a definition.
30 /// Contrary to `def_span` below, this query returns the full absolute span of the definition.
31 /// This span is meant for dep-tracking rather than diagnostics. It should not be used outside
32 /// of rustc_middle::hir::source_map.
33 query source_span(key: LocalDefId) -> Span {
34 desc { "get the source span" }
37 /// Represents crate as a whole (as distinct from the top-level crate module).
38 /// If you call `hir_crate` (e.g., indirectly by calling `tcx.hir().krate()`),
39 /// we will have to assume that any change means that you need to be recompiled.
40 /// This is because the `hir_crate` query gives you access to all other items.
41 /// To avoid this fate, do not call `tcx.hir().krate()`; instead,
42 /// prefer wrappers like `tcx.visit_all_items_in_krate()`.
43 query hir_crate(key: ()) -> &'tcx Crate<'tcx> {
45 desc { "get the crate HIR" }
48 /// The items in a module.
50 /// This can be conveniently accessed by `tcx.hir().visit_item_likes_in_module`.
51 /// Avoid calling this query directly.
52 query hir_module_items(key: LocalDefId) -> rustc_middle::hir::ModuleItems {
53 storage(ArenaCacheSelector<'tcx>)
54 desc { |tcx| "HIR module items in `{}`", tcx.def_path_str(key.to_def_id()) }
57 /// Gives access to the HIR node for the HIR owner `key`.
59 /// This can be conveniently accessed by methods on `tcx.hir()`.
60 /// Avoid calling this query directly.
61 query hir_owner(key: LocalDefId) -> Option<crate::hir::Owner<'tcx>> {
62 desc { |tcx| "HIR owner of `{}`", tcx.def_path_str(key.to_def_id()) }
65 /// Gives access to the HIR ID for the given `LocalDefId` owner `key`.
67 /// This can be conveniently accessed by methods on `tcx.hir()`.
68 /// Avoid calling this query directly.
69 query local_def_id_to_hir_id(key: LocalDefId) -> hir::HirId {
70 desc { |tcx| "HIR ID of `{}`", tcx.def_path_str(key.to_def_id()) }
73 /// Gives access to the HIR node's parent for the HIR owner `key`.
75 /// This can be conveniently accessed by methods on `tcx.hir()`.
76 /// Avoid calling this query directly.
77 query hir_owner_parent(key: LocalDefId) -> hir::HirId {
78 desc { |tcx| "HIR parent of `{}`", tcx.def_path_str(key.to_def_id()) }
81 /// Gives access to the HIR nodes and bodies inside the HIR owner `key`.
83 /// This can be conveniently accessed by methods on `tcx.hir()`.
84 /// Avoid calling this query directly.
85 query hir_owner_nodes(key: LocalDefId) -> hir::MaybeOwner<&'tcx hir::OwnerNodes<'tcx>> {
86 desc { |tcx| "HIR owner items in `{}`", tcx.def_path_str(key.to_def_id()) }
89 /// Gives access to the HIR attributes inside the HIR owner `key`.
91 /// This can be conveniently accessed by methods on `tcx.hir()`.
92 /// Avoid calling this query directly.
93 query hir_attrs(key: LocalDefId) -> &'tcx hir::AttributeMap<'tcx> {
94 desc { |tcx| "HIR owner attributes in `{}`", tcx.def_path_str(key.to_def_id()) }
97 /// Computes the `DefId` of the corresponding const parameter in case the `key` is a
98 /// const argument and returns `None` otherwise.
100 /// ```ignore (incomplete)
101 /// let a = foo::<7>();
102 /// // ^ Calling `opt_const_param_of` for this argument,
104 /// fn foo<const N: usize>()
105 /// // ^ returns this `DefId`.
108 /// // ^ While calling `opt_const_param_of` for other bodies returns `None`.
111 // It looks like caching this query on disk actually slightly
112 // worsened performance in #74376.
114 // Once const generics are more prevalently used, we might want to
115 // consider only caching calls returning `Some`.
116 query opt_const_param_of(key: LocalDefId) -> Option<DefId> {
117 desc { |tcx| "computing the optional const parameter of `{}`", tcx.def_path_str(key.to_def_id()) }
120 /// Given the def_id of a const-generic parameter, computes the associated default const
121 /// parameter. e.g. `fn example<const N: usize=3>` called on `N` would return `3`.
122 query const_param_default(param: DefId) -> ty::Const<'tcx> {
123 desc { |tcx| "compute const default for a given parameter `{}`", tcx.def_path_str(param) }
124 separate_provide_extern
127 /// Records the type of every item.
128 query type_of(key: DefId) -> Ty<'tcx> {
132 use rustc_hir::def::DefKind;
133 match tcx.def_kind(key) {
134 DefKind::TyAlias => "expanding type alias",
135 DefKind::TraitAlias => "expanding trait alias",
136 _ => "computing type of",
139 path = tcx.def_path_str(key),
141 cache_on_disk_if { key.is_local() }
142 separate_provide_extern
145 query analysis(key: ()) -> Result<(), ErrorGuaranteed> {
147 desc { "running analysis passes on this crate" }
150 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to its
151 /// associated generics.
152 query generics_of(key: DefId) -> ty::Generics {
153 desc { |tcx| "computing generics of `{}`", tcx.def_path_str(key) }
154 storage(ArenaCacheSelector<'tcx>)
155 cache_on_disk_if { key.is_local() }
156 separate_provide_extern
159 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
160 /// predicates (where-clauses) that must be proven true in order
161 /// to reference it. This is almost always the "predicates query"
164 /// `predicates_of` builds on `predicates_defined_on` -- in fact,
165 /// it is almost always the same as that query, except for the
166 /// case of traits. For traits, `predicates_of` contains
167 /// an additional `Self: Trait<...>` predicate that users don't
168 /// actually write. This reflects the fact that to invoke the
169 /// trait (e.g., via `Default::default`) you must supply types
170 /// that actually implement the trait. (However, this extra
171 /// predicate gets in the way of some checks, which are intended
172 /// to operate over only the actual where-clauses written by the
174 query predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
175 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
176 cache_on_disk_if { key.is_local() }
179 /// Returns the list of bounds that can be used for
180 /// `SelectionCandidate::ProjectionCandidate(_)` and
181 /// `ProjectionTyCandidate::TraitDef`.
182 /// Specifically this is the bounds written on the trait's type
183 /// definition, or those after the `impl` keyword
185 /// ```ignore (incomplete)
186 /// type X: Bound + 'lt
188 /// impl Debug + Display
189 /// // ^^^^^^^^^^^^^^^
192 /// `key` is the `DefId` of the associated type or opaque type.
194 /// Bounds from the parent (e.g. with nested impl trait) are not included.
195 query explicit_item_bounds(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
196 desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
197 separate_provide_extern
200 /// Elaborated version of the predicates from `explicit_item_bounds`.
206 /// type MyAType: Eq + ?Sized;
210 /// `explicit_item_bounds` returns `[<Self as MyTrait>::MyAType: Eq]`,
211 /// and `item_bounds` returns
214 /// <Self as Trait>::MyAType: Eq,
215 /// <Self as Trait>::MyAType: PartialEq<<Self as Trait>::MyAType>
219 /// Bounds from the parent (e.g. with nested impl trait) are not included.
220 query item_bounds(key: DefId) -> &'tcx ty::List<ty::Predicate<'tcx>> {
221 desc { |tcx| "elaborating item bounds for `{}`", tcx.def_path_str(key) }
224 query native_libraries(_: CrateNum) -> Vec<NativeLib> {
225 storage(ArenaCacheSelector<'tcx>)
226 desc { "looking up the native libraries of a linked crate" }
227 separate_provide_extern
230 query lint_levels(_: ()) -> LintLevelMap {
231 storage(ArenaCacheSelector<'tcx>)
233 desc { "computing the lint levels for items in this crate" }
236 query parent_module_from_def_id(key: LocalDefId) -> LocalDefId {
238 desc { |tcx| "parent module of `{}`", tcx.def_path_str(key.to_def_id()) }
241 query expn_that_defined(key: DefId) -> rustc_span::ExpnId {
242 // This query reads from untracked data in definitions.
244 desc { |tcx| "expansion that defined `{}`", tcx.def_path_str(key) }
245 separate_provide_extern
248 query is_panic_runtime(_: CrateNum) -> bool {
250 desc { "checking if the crate is_panic_runtime" }
251 separate_provide_extern
254 /// Fetch the THIR for a given body. If typeck for that body failed, returns an empty `Thir`.
255 query thir_body(key: ty::WithOptConstParam<LocalDefId>)
256 -> Result<(&'tcx Steal<thir::Thir<'tcx>>, thir::ExprId), ErrorGuaranteed>
258 // Perf tests revealed that hashing THIR is inefficient (see #85729).
260 desc { |tcx| "building THIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
263 /// Create a THIR tree for debugging.
264 query thir_tree(key: ty::WithOptConstParam<LocalDefId>) -> String {
266 storage(ArenaCacheSelector<'tcx>)
267 desc { |tcx| "constructing THIR tree for `{}`", tcx.def_path_str(key.did.to_def_id()) }
270 /// Set of all the `DefId`s in this crate that have MIR associated with
271 /// them. This includes all the body owners, but also things like struct
273 query mir_keys(_: ()) -> rustc_data_structures::fx::FxIndexSet<LocalDefId> {
274 storage(ArenaCacheSelector<'tcx>)
275 desc { "getting a list of all mir_keys" }
278 /// Maps DefId's that have an associated `mir::Body` to the result
279 /// of the MIR const-checking pass. This is the set of qualifs in
280 /// the final value of a `const`.
281 query mir_const_qualif(key: DefId) -> mir::ConstQualifs {
282 desc { |tcx| "const checking `{}`", tcx.def_path_str(key) }
283 cache_on_disk_if { key.is_local() }
284 separate_provide_extern
286 query mir_const_qualif_const_arg(
287 key: (LocalDefId, DefId)
288 ) -> mir::ConstQualifs {
290 |tcx| "const checking the const argument `{}`",
291 tcx.def_path_str(key.0.to_def_id())
295 /// Fetch the MIR for a given `DefId` right after it's built - this includes
296 /// unreachable code.
297 query mir_built(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
298 desc { |tcx| "building MIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
301 /// Fetch the MIR for a given `DefId` up till the point where it is
302 /// ready for const qualification.
304 /// See the README for the `mir` module for details.
305 query mir_const(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
307 |tcx| "processing MIR for {}`{}`",
308 if key.const_param_did.is_some() { "the const argument " } else { "" },
309 tcx.def_path_str(key.did.to_def_id()),
314 /// Try to build an abstract representation of the given constant.
315 query thir_abstract_const(
317 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorGuaranteed> {
319 |tcx| "building an abstract representation for {}", tcx.def_path_str(key),
321 separate_provide_extern
323 /// Try to build an abstract representation of the given constant.
324 query thir_abstract_const_of_const_arg(
325 key: (LocalDefId, DefId)
326 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorGuaranteed> {
329 "building an abstract representation for the const argument {}",
330 tcx.def_path_str(key.0.to_def_id()),
334 query try_unify_abstract_consts(key:
335 ty::ParamEnvAnd<'tcx, (ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
338 |tcx| "trying to unify the generic constants {} and {}",
339 tcx.def_path_str(key.value.0.def.did), tcx.def_path_str(key.value.1.def.did)
343 query mir_drops_elaborated_and_const_checked(
344 key: ty::WithOptConstParam<LocalDefId>
345 ) -> &'tcx Steal<mir::Body<'tcx>> {
347 desc { |tcx| "elaborating drops for `{}`", tcx.def_path_str(key.did.to_def_id()) }
352 ) -> &'tcx mir::Body<'tcx> {
353 desc { |tcx| "caching mir of `{}` for CTFE", tcx.def_path_str(key) }
354 cache_on_disk_if { key.is_local() }
355 separate_provide_extern
358 query mir_for_ctfe_of_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::Body<'tcx> {
360 |tcx| "MIR for CTFE of the const argument `{}`",
361 tcx.def_path_str(key.0.to_def_id())
365 query mir_promoted(key: ty::WithOptConstParam<LocalDefId>) ->
367 &'tcx Steal<mir::Body<'tcx>>,
368 &'tcx Steal<IndexVec<mir::Promoted, mir::Body<'tcx>>>
372 |tcx| "processing {}`{}`",
373 if key.const_param_did.is_some() { "the const argument " } else { "" },
374 tcx.def_path_str(key.did.to_def_id()),
378 query symbols_for_closure_captures(
379 key: (LocalDefId, DefId)
380 ) -> Vec<rustc_span::Symbol> {
381 storage(ArenaCacheSelector<'tcx>)
383 |tcx| "symbols for captures of closure `{}` in `{}`",
384 tcx.def_path_str(key.1),
385 tcx.def_path_str(key.0.to_def_id())
389 /// MIR after our optimization passes have run. This is MIR that is ready
390 /// for codegen. This is also the only query that can fetch non-local MIR, at present.
391 query optimized_mir(key: DefId) -> &'tcx mir::Body<'tcx> {
392 desc { |tcx| "optimizing MIR for `{}`", tcx.def_path_str(key) }
393 cache_on_disk_if { key.is_local() }
394 separate_provide_extern
397 /// Returns coverage summary info for a function, after executing the `InstrumentCoverage`
398 /// MIR pass (assuming the -Cinstrument-coverage option is enabled).
399 query coverageinfo(key: ty::InstanceDef<'tcx>) -> mir::CoverageInfo {
400 desc { |tcx| "retrieving coverage info from MIR for `{}`", tcx.def_path_str(key.def_id()) }
401 storage(ArenaCacheSelector<'tcx>)
404 /// Returns the `CodeRegions` for a function that has instrumented coverage, in case the
405 /// function was optimized out before codegen, and before being added to the Coverage Map.
406 query covered_code_regions(key: DefId) -> Vec<&'tcx mir::coverage::CodeRegion> {
408 |tcx| "retrieving the covered `CodeRegion`s, if instrumented, for `{}`",
409 tcx.def_path_str(key)
411 storage(ArenaCacheSelector<'tcx>)
412 cache_on_disk_if { key.is_local() }
415 /// The `DefId` is the `DefId` of the containing MIR body. Promoteds do not have their own
416 /// `DefId`. This function returns all promoteds in the specified body. The body references
417 /// promoteds by the `DefId` and the `mir::Promoted` index. This is necessary, because
418 /// after inlining a body may refer to promoteds from other bodies. In that case you still
419 /// need to use the `DefId` of the original body.
420 query promoted_mir(key: DefId) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
421 desc { |tcx| "optimizing promoted MIR for `{}`", tcx.def_path_str(key) }
422 cache_on_disk_if { key.is_local() }
423 separate_provide_extern
425 query promoted_mir_of_const_arg(
426 key: (LocalDefId, DefId)
427 ) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
429 |tcx| "optimizing promoted MIR for the const argument `{}`",
430 tcx.def_path_str(key.0.to_def_id()),
434 /// Erases regions from `ty` to yield a new type.
435 /// Normally you would just use `tcx.erase_regions(value)`,
436 /// however, which uses this query as a kind of cache.
437 query erase_regions_ty(ty: Ty<'tcx>) -> Ty<'tcx> {
438 // This query is not expected to have input -- as a result, it
439 // is not a good candidates for "replay" because it is essentially a
440 // pure function of its input (and hence the expectation is that
441 // no caller would be green **apart** from just these
442 // queries). Making it anonymous avoids hashing the result, which
443 // may save a bit of time.
445 desc { "erasing regions from `{:?}`", ty }
448 query wasm_import_module_map(_: CrateNum) -> FxHashMap<DefId, String> {
449 storage(ArenaCacheSelector<'tcx>)
450 desc { "wasm import module map" }
453 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
454 /// predicates (where-clauses) directly defined on it. This is
455 /// equal to the `explicit_predicates_of` predicates plus the
456 /// `inferred_outlives_of` predicates.
457 query predicates_defined_on(key: DefId) -> ty::GenericPredicates<'tcx> {
458 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
461 /// Returns everything that looks like a predicate written explicitly
462 /// by the user on a trait item.
464 /// Traits are unusual, because predicates on associated types are
465 /// converted into bounds on that type for backwards compatibility:
467 /// trait X where Self::U: Copy { type U; }
471 /// trait X { type U: Copy; }
473 /// `explicit_predicates_of` and `explicit_item_bounds` will then take
474 /// the appropriate subsets of the predicates here.
475 query trait_explicit_predicates_and_bounds(key: LocalDefId) -> ty::GenericPredicates<'tcx> {
476 desc { |tcx| "computing explicit predicates of trait `{}`", tcx.def_path_str(key.to_def_id()) }
479 /// Returns the predicates written explicitly by the user.
480 query explicit_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
481 desc { |tcx| "computing explicit predicates of `{}`", tcx.def_path_str(key) }
482 separate_provide_extern
485 /// Returns the inferred outlives predicates (e.g., for `struct
486 /// Foo<'a, T> { x: &'a T }`, this would return `T: 'a`).
487 query inferred_outlives_of(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
488 desc { |tcx| "computing inferred outlives predicates of `{}`", tcx.def_path_str(key) }
489 separate_provide_extern
492 /// Maps from the `DefId` of a trait to the list of
493 /// super-predicates. This is a subset of the full list of
494 /// predicates. We store these in a separate map because we must
495 /// evaluate them even during type conversion, often before the
496 /// full predicates are available (note that supertraits have
497 /// additional acyclicity requirements).
498 query super_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
499 desc { |tcx| "computing the super predicates of `{}`", tcx.def_path_str(key) }
500 separate_provide_extern
503 /// The `Option<Ident>` is the name of an associated type. If it is `None`, then this query
504 /// returns the full set of predicates. If `Some<Ident>`, then the query returns only the
505 /// subset of super-predicates that reference traits that define the given associated type.
506 /// This is used to avoid cycles in resolving types like `T::Item`.
507 query super_predicates_that_define_assoc_type(key: (DefId, Option<rustc_span::symbol::Ident>)) -> ty::GenericPredicates<'tcx> {
508 desc { |tcx| "computing the super traits of `{}`{}",
509 tcx.def_path_str(key.0),
510 if let Some(assoc_name) = key.1 { format!(" with associated type name `{}`", assoc_name) } else { "".to_string() },
514 /// To avoid cycles within the predicates of a single item we compute
515 /// per-type-parameter predicates for resolving `T::AssocTy`.
516 query type_param_predicates(key: (DefId, LocalDefId, rustc_span::symbol::Ident)) -> ty::GenericPredicates<'tcx> {
517 desc { |tcx| "computing the bounds for type parameter `{}`", {
518 let id = tcx.hir().local_def_id_to_hir_id(key.1);
519 tcx.hir().ty_param_name(id)
523 query trait_def(key: DefId) -> ty::TraitDef {
524 desc { |tcx| "computing trait definition for `{}`", tcx.def_path_str(key) }
525 storage(ArenaCacheSelector<'tcx>)
526 separate_provide_extern
528 query adt_def(key: DefId) -> ty::AdtDef<'tcx> {
529 desc { |tcx| "computing ADT definition for `{}`", tcx.def_path_str(key) }
530 cache_on_disk_if { key.is_local() }
531 separate_provide_extern
533 query adt_destructor(key: DefId) -> Option<ty::Destructor> {
534 desc { |tcx| "computing `Drop` impl for `{}`", tcx.def_path_str(key) }
535 separate_provide_extern
538 // The cycle error here should be reported as an error by `check_representable`.
539 // We consider the type as Sized in the meanwhile to avoid
540 // further errors (done in impl Value for AdtSizedConstraint).
541 // Use `cycle_delay_bug` to delay the cycle error here to be emitted later
542 // in case we accidentally otherwise don't emit an error.
543 query adt_sized_constraint(
545 ) -> AdtSizedConstraint<'tcx> {
546 desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
550 query adt_dtorck_constraint(
552 ) -> Result<&'tcx DropckConstraint<'tcx>, NoSolution> {
553 desc { |tcx| "computing drop-check constraints for `{}`", tcx.def_path_str(key) }
556 /// Returns `true` if this is a const fn, use the `is_const_fn` to know whether your crate
557 /// actually sees it as const fn (e.g., the const-fn-ness might be unstable and you might
558 /// not have the feature gate active).
560 /// **Do not call this function manually.** It is only meant to cache the base data for the
561 /// `is_const_fn` function.
562 query impl_constness(key: DefId) -> hir::Constness {
563 desc { |tcx| "checking if item is const fn: `{}`", tcx.def_path_str(key) }
564 separate_provide_extern
567 query asyncness(key: DefId) -> hir::IsAsync {
568 desc { |tcx| "checking if the function is async: `{}`", tcx.def_path_str(key) }
569 separate_provide_extern
572 /// Returns `true` if calls to the function may be promoted.
574 /// This is either because the function is e.g., a tuple-struct or tuple-variant
575 /// constructor, or because it has the `#[rustc_promotable]` attribute. The attribute should
576 /// be removed in the future in favour of some form of check which figures out whether the
577 /// function does not inspect the bits of any of its arguments (so is essentially just a
578 /// constructor function).
579 query is_promotable_const_fn(key: DefId) -> bool {
580 desc { |tcx| "checking if item is promotable: `{}`", tcx.def_path_str(key) }
583 /// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
584 query is_foreign_item(key: DefId) -> bool {
585 desc { |tcx| "checking if `{}` is a foreign item", tcx.def_path_str(key) }
586 separate_provide_extern
589 /// Returns `Some(generator_kind)` if the node pointed to by `def_id` is a generator.
590 query generator_kind(def_id: DefId) -> Option<hir::GeneratorKind> {
591 desc { |tcx| "looking up generator kind of `{}`", tcx.def_path_str(def_id) }
592 separate_provide_extern
595 /// Gets a map with the variance of every item; use `item_variance` instead.
596 query crate_variances(_: ()) -> ty::CrateVariancesMap<'tcx> {
597 storage(ArenaCacheSelector<'tcx>)
598 desc { "computing the variances for items in this crate" }
601 /// Maps from the `DefId` of a type or region parameter to its (inferred) variance.
602 query variances_of(def_id: DefId) -> &'tcx [ty::Variance] {
603 desc { |tcx| "computing the variances of `{}`", tcx.def_path_str(def_id) }
604 separate_provide_extern
607 /// Maps from thee `DefId` of a type to its (inferred) outlives.
608 query inferred_outlives_crate(_: ()) -> ty::CratePredicatesMap<'tcx> {
609 storage(ArenaCacheSelector<'tcx>)
610 desc { "computing the inferred outlives predicates for items in this crate" }
613 /// Maps from an impl/trait `DefId` to a list of the `DefId`s of its items.
614 query associated_item_def_ids(key: DefId) -> &'tcx [DefId] {
615 desc { |tcx| "collecting associated items of `{}`", tcx.def_path_str(key) }
616 separate_provide_extern
619 /// Maps from a trait item to the trait item "descriptor".
620 query associated_item(key: DefId) -> ty::AssocItem {
621 desc { |tcx| "computing associated item data for `{}`", tcx.def_path_str(key) }
622 storage(ArenaCacheSelector<'tcx>)
623 separate_provide_extern
626 /// Collects the associated items defined on a trait or impl.
627 query associated_items(key: DefId) -> ty::AssocItems<'tcx> {
628 storage(ArenaCacheSelector<'tcx>)
629 desc { |tcx| "collecting associated items of {}", tcx.def_path_str(key) }
632 /// Maps from associated items on a trait to the corresponding associated
633 /// item on the impl specified by `impl_id`.
635 /// For example, with the following code
640 /// trait Trait { // trait_id
641 /// fn f(); // trait_f
642 /// fn g() {} // trait_g
645 /// impl Trait for Type { // impl_id
646 /// fn f() {} // impl_f
647 /// fn g() {} // impl_g
651 /// The map returned for `tcx.impl_item_implementor_ids(impl_id)` would be
652 ///`{ trait_f: impl_f, trait_g: impl_g }`
653 query impl_item_implementor_ids(impl_id: DefId) -> FxHashMap<DefId, DefId> {
654 storage(ArenaCacheSelector<'tcx>)
655 desc { |tcx| "comparing impl items against trait for {}", tcx.def_path_str(impl_id) }
658 /// Given an `impl_id`, return the trait it implements.
659 /// Return `None` if this is an inherent impl.
660 query impl_trait_ref(impl_id: DefId) -> Option<ty::TraitRef<'tcx>> {
661 desc { |tcx| "computing trait implemented by `{}`", tcx.def_path_str(impl_id) }
662 separate_provide_extern
664 query impl_polarity(impl_id: DefId) -> ty::ImplPolarity {
665 desc { |tcx| "computing implementation polarity of `{}`", tcx.def_path_str(impl_id) }
666 separate_provide_extern
669 query issue33140_self_ty(key: DefId) -> Option<ty::Ty<'tcx>> {
670 desc { |tcx| "computing Self type wrt issue #33140 `{}`", tcx.def_path_str(key) }
673 /// Maps a `DefId` of a type to a list of its inherent impls.
674 /// Contains implementations of methods that are inherent to a type.
675 /// Methods in these implementations don't need to be exported.
676 query inherent_impls(key: DefId) -> &'tcx [DefId] {
677 desc { |tcx| "collecting inherent impls for `{}`", tcx.def_path_str(key) }
678 separate_provide_extern
681 query incoherent_impls(key: SimplifiedType) -> &'tcx [DefId] {
682 desc { |tcx| "collecting all inherent impls for `{:?}`", key }
685 /// The result of unsafety-checking this `LocalDefId`.
686 query unsafety_check_result(key: LocalDefId) -> &'tcx mir::UnsafetyCheckResult {
687 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
688 cache_on_disk_if { true }
690 query unsafety_check_result_for_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::UnsafetyCheckResult {
692 |tcx| "unsafety-checking the const argument `{}`",
693 tcx.def_path_str(key.0.to_def_id())
697 /// Unsafety-check this `LocalDefId` with THIR unsafeck. This should be
698 /// used with `-Zthir-unsafeck`.
699 query thir_check_unsafety(key: LocalDefId) {
700 desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key.to_def_id()) }
701 cache_on_disk_if { true }
703 query thir_check_unsafety_for_const_arg(key: (LocalDefId, DefId)) {
705 |tcx| "unsafety-checking the const argument `{}`",
706 tcx.def_path_str(key.0.to_def_id())
710 /// HACK: when evaluated, this reports an "unsafe derive on repr(packed)" error.
712 /// Unsafety checking is executed for each method separately, but we only want
713 /// to emit this error once per derive. As there are some impls with multiple
714 /// methods, we use a query for deduplication.
715 query unsafe_derive_on_repr_packed(key: LocalDefId) -> () {
716 desc { |tcx| "processing `{}`", tcx.def_path_str(key.to_def_id()) }
719 /// Computes the signature of the function.
720 query fn_sig(key: DefId) -> ty::PolyFnSig<'tcx> {
721 desc { |tcx| "computing function signature of `{}`", tcx.def_path_str(key) }
722 separate_provide_extern
725 /// Performs lint checking for the module.
726 query lint_mod(key: LocalDefId) -> () {
727 desc { |tcx| "linting {}", describe_as_module(key, tcx) }
730 /// Checks the attributes in the module.
731 query check_mod_attrs(key: LocalDefId) -> () {
732 desc { |tcx| "checking attributes in {}", describe_as_module(key, tcx) }
735 /// Checks for uses of unstable APIs in the module.
736 query check_mod_unstable_api_usage(key: LocalDefId) -> () {
737 desc { |tcx| "checking for unstable API usage in {}", describe_as_module(key, tcx) }
740 /// Checks the const bodies in the module for illegal operations (e.g. `if` or `loop`).
741 query check_mod_const_bodies(key: LocalDefId) -> () {
742 desc { |tcx| "checking consts in {}", describe_as_module(key, tcx) }
745 /// Checks the loops in the module.
746 query check_mod_loops(key: LocalDefId) -> () {
747 desc { |tcx| "checking loops in {}", describe_as_module(key, tcx) }
750 query check_mod_naked_functions(key: LocalDefId) -> () {
751 desc { |tcx| "checking naked functions in {}", describe_as_module(key, tcx) }
754 query check_mod_item_types(key: LocalDefId) -> () {
755 desc { |tcx| "checking item types in {}", describe_as_module(key, tcx) }
758 query check_mod_privacy(key: LocalDefId) -> () {
759 desc { |tcx| "checking privacy in {}", describe_as_module(key, tcx) }
762 query check_mod_intrinsics(key: LocalDefId) -> () {
763 desc { |tcx| "checking intrinsics in {}", describe_as_module(key, tcx) }
766 query check_mod_liveness(key: LocalDefId) -> () {
767 desc { |tcx| "checking liveness of variables in {}", describe_as_module(key, tcx) }
770 /// Return the live symbols in the crate for dead code check.
772 /// The second return value maps from ADTs to ignored derived traits (e.g. Debug and Clone) and
773 /// their respective impl (i.e., part of the derive macro)
774 query live_symbols_and_ignored_derived_traits(_: ()) -> (
775 FxHashSet<LocalDefId>,
776 FxHashMap<LocalDefId, Vec<(DefId, DefId)>>
778 storage(ArenaCacheSelector<'tcx>)
779 desc { "find live symbols in crate" }
782 query check_mod_deathness(key: LocalDefId) -> () {
783 desc { |tcx| "checking deathness of variables in {}", describe_as_module(key, tcx) }
786 query check_mod_impl_wf(key: LocalDefId) -> () {
787 desc { |tcx| "checking that impls are well-formed in {}", describe_as_module(key, tcx) }
790 query collect_mod_item_types(key: LocalDefId) -> () {
791 desc { |tcx| "collecting item types in {}", describe_as_module(key, tcx) }
794 /// Caches `CoerceUnsized` kinds for impls on custom types.
795 query coerce_unsized_info(key: DefId) -> ty::adjustment::CoerceUnsizedInfo {
796 desc { |tcx| "computing CoerceUnsized info for `{}`", tcx.def_path_str(key) }
797 separate_provide_extern
800 query typeck_item_bodies(_: ()) -> () {
801 desc { "type-checking all item bodies" }
804 query typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
805 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
806 cache_on_disk_if { true }
808 query typeck_const_arg(
809 key: (LocalDefId, DefId)
810 ) -> &'tcx ty::TypeckResults<'tcx> {
812 |tcx| "type-checking the const argument `{}`",
813 tcx.def_path_str(key.0.to_def_id()),
816 query diagnostic_only_typeck(key: LocalDefId) -> &'tcx ty::TypeckResults<'tcx> {
817 desc { |tcx| "type-checking `{}`", tcx.def_path_str(key.to_def_id()) }
818 cache_on_disk_if { true }
819 load_cached(tcx, id) {
820 let typeck_results: Option<ty::TypeckResults<'tcx>> = tcx
821 .on_disk_cache().as_ref()
822 .and_then(|c| c.try_load_query_result(*tcx, id));
824 typeck_results.map(|x| &*tcx.arena.alloc(x))
828 query used_trait_imports(key: LocalDefId) -> &'tcx FxHashSet<LocalDefId> {
829 desc { |tcx| "used_trait_imports `{}`", tcx.def_path_str(key.to_def_id()) }
830 cache_on_disk_if { true }
833 query has_typeck_results(def_id: DefId) -> bool {
834 desc { |tcx| "checking whether `{}` has a body", tcx.def_path_str(def_id) }
837 query coherent_trait(def_id: DefId) -> () {
838 desc { |tcx| "coherence checking all impls of trait `{}`", tcx.def_path_str(def_id) }
841 /// Borrow-checks the function body. If this is a closure, returns
842 /// additional requirements that the closure's creator must verify.
843 query mir_borrowck(key: LocalDefId) -> &'tcx mir::BorrowCheckResult<'tcx> {
844 desc { |tcx| "borrow-checking `{}`", tcx.def_path_str(key.to_def_id()) }
845 cache_on_disk_if(tcx) { tcx.is_typeck_child(key.to_def_id()) }
847 query mir_borrowck_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::BorrowCheckResult<'tcx> {
849 |tcx| "borrow-checking the const argument`{}`",
850 tcx.def_path_str(key.0.to_def_id())
854 /// Gets a complete map from all types to their inherent impls.
855 /// Not meant to be used directly outside of coherence.
856 query crate_inherent_impls(k: ()) -> CrateInherentImpls {
857 storage(ArenaCacheSelector<'tcx>)
858 desc { "all inherent impls defined in crate" }
861 /// Checks all types in the crate for overlap in their inherent impls. Reports errors.
862 /// Not meant to be used directly outside of coherence.
863 query crate_inherent_impls_overlap_check(_: ()) -> () {
864 desc { "check for overlap between inherent impls defined in this crate" }
867 /// Checks whether all impls in the crate pass the overlap check, returning
868 /// which impls fail it. If all impls are correct, the returned slice is empty.
869 query orphan_check_crate(_: ()) -> &'tcx [LocalDefId] {
871 "checking whether the immpl in the this crate follow the orphan rules",
875 /// Check whether the function has any recursion that could cause the inliner to trigger
876 /// a cycle. Returns the call stack causing the cycle. The call stack does not contain the
877 /// current function, just all intermediate functions.
878 query mir_callgraph_reachable(key: (ty::Instance<'tcx>, LocalDefId)) -> bool {
881 "computing if `{}` (transitively) calls `{}`",
883 tcx.def_path_str(key.1.to_def_id()),
887 /// Obtain all the calls into other local functions
888 query mir_inliner_callees(key: ty::InstanceDef<'tcx>) -> &'tcx [(DefId, SubstsRef<'tcx>)] {
891 "computing all local function calls in `{}`",
892 tcx.def_path_str(key.def_id()),
896 /// Evaluates a constant and returns the computed allocation.
898 /// **Do not use this** directly, use the `tcx.eval_static_initializer` wrapper.
899 query eval_to_allocation_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
900 -> EvalToAllocationRawResult<'tcx> {
902 "const-evaluating + checking `{}`",
903 key.value.display(tcx)
905 cache_on_disk_if { true }
908 /// Evaluates const items or anonymous constants
909 /// (such as enum variant explicit discriminants or array lengths)
910 /// into a representation suitable for the type system and const generics.
912 /// **Do not use this** directly, use one of the following wrappers: `tcx.const_eval_poly`,
913 /// `tcx.const_eval_resolve`, `tcx.const_eval_instance`, or `tcx.const_eval_global_id`.
914 query eval_to_const_value_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
915 -> EvalToConstValueResult<'tcx> {
917 "simplifying constant for the type system `{}`",
918 key.value.display(tcx)
920 cache_on_disk_if { true }
923 /// Convert an evaluated constant to a type level constant or
924 /// return `None` if that is not possible.
925 query const_to_valtree(
926 key: ty::ParamEnvAnd<'tcx, ConstAlloc<'tcx>>
927 ) -> Option<ty::ValTree<'tcx>> {
928 desc { "destructure constant" }
932 /// Destructure a constant ADT or array into its variant index and its
933 /// field values or return `None` if constant is invalid.
935 /// Use infallible `TyCtxt::destructure_const` when you know that constant is valid.
936 query try_destructure_const(
937 key: ty::ParamEnvAnd<'tcx, ty::Const<'tcx>>
938 ) -> Option<mir::DestructuredConst<'tcx>> {
939 desc { "destructure constant" }
943 /// Dereference a constant reference or raw pointer and turn the result into a constant
946 key: ty::ParamEnvAnd<'tcx, ty::Const<'tcx>>
947 ) -> ty::Const<'tcx> {
948 desc { "deref constant" }
952 query const_caller_location(key: (rustc_span::Symbol, u32, u32)) -> ConstValue<'tcx> {
953 desc { "get a &core::panic::Location referring to a span" }
956 // FIXME get rid of this with valtrees
958 key: LitToConstInput<'tcx>
959 ) -> Result<ty::Const<'tcx>, LitToConstError> {
960 desc { "converting literal to const" }
963 query lit_to_mir_constant(key: LitToConstInput<'tcx>) -> Result<mir::ConstantKind<'tcx>, LitToConstError> {
964 desc { "converting literal to mir constant" }
967 query check_match(key: DefId) {
968 desc { |tcx| "match-checking `{}`", tcx.def_path_str(key) }
969 cache_on_disk_if { key.is_local() }
972 /// Performs part of the privacy check and computes "access levels".
973 query privacy_access_levels(_: ()) -> &'tcx AccessLevels {
975 desc { "privacy access levels" }
977 query check_private_in_public(_: ()) -> () {
979 desc { "checking for private elements in public interfaces" }
982 query reachable_set(_: ()) -> FxHashSet<LocalDefId> {
983 storage(ArenaCacheSelector<'tcx>)
984 desc { "reachability" }
987 /// Per-body `region::ScopeTree`. The `DefId` should be the owner `DefId` for the body;
988 /// in the case of closures, this will be redirected to the enclosing function.
989 query region_scope_tree(def_id: DefId) -> &'tcx region::ScopeTree {
990 desc { |tcx| "computing drop scopes for `{}`", tcx.def_path_str(def_id) }
993 /// Generates a MIR body for the shim.
994 query mir_shims(key: ty::InstanceDef<'tcx>) -> mir::Body<'tcx> {
995 storage(ArenaCacheSelector<'tcx>)
996 desc { |tcx| "generating MIR shim for `{}`", tcx.def_path_str(key.def_id()) }
999 /// The `symbol_name` query provides the symbol name for calling a
1000 /// given instance from the local crate. In particular, it will also
1001 /// look up the correct symbol name of instances from upstream crates.
1002 query symbol_name(key: ty::Instance<'tcx>) -> ty::SymbolName<'tcx> {
1003 desc { "computing the symbol for `{}`", key }
1004 cache_on_disk_if { true }
1007 query opt_def_kind(def_id: DefId) -> Option<DefKind> {
1008 desc { |tcx| "looking up definition kind of `{}`", tcx.def_path_str(def_id) }
1009 separate_provide_extern
1012 /// Gets the span for the definition.
1013 query def_span(def_id: DefId) -> Span {
1014 desc { |tcx| "looking up span for `{}`", tcx.def_path_str(def_id) }
1015 separate_provide_extern
1018 /// Gets the span for the identifier of the definition.
1019 query def_ident_span(def_id: DefId) -> Option<Span> {
1020 desc { |tcx| "looking up span for `{}`'s identifier", tcx.def_path_str(def_id) }
1021 separate_provide_extern
1024 query lookup_stability(def_id: DefId) -> Option<attr::Stability> {
1025 desc { |tcx| "looking up stability of `{}`", tcx.def_path_str(def_id) }
1026 separate_provide_extern
1029 query lookup_const_stability(def_id: DefId) -> Option<attr::ConstStability> {
1030 desc { |tcx| "looking up const stability of `{}`", tcx.def_path_str(def_id) }
1031 separate_provide_extern
1034 query should_inherit_track_caller(def_id: DefId) -> bool {
1035 desc { |tcx| "computing should_inherit_track_caller of `{}`", tcx.def_path_str(def_id) }
1038 query lookup_deprecation_entry(def_id: DefId) -> Option<DeprecationEntry> {
1039 desc { |tcx| "checking whether `{}` is deprecated", tcx.def_path_str(def_id) }
1040 separate_provide_extern
1043 /// Determines whether an item is annotated with `doc(hidden)`.
1044 query is_doc_hidden(def_id: DefId) -> bool {
1045 desc { |tcx| "checking whether `{}` is `doc(hidden)`", tcx.def_path_str(def_id) }
1048 query item_attrs(def_id: DefId) -> &'tcx [ast::Attribute] {
1049 desc { |tcx| "collecting attributes of `{}`", tcx.def_path_str(def_id) }
1050 separate_provide_extern
1053 query codegen_fn_attrs(def_id: DefId) -> CodegenFnAttrs {
1054 desc { |tcx| "computing codegen attributes of `{}`", tcx.def_path_str(def_id) }
1055 storage(ArenaCacheSelector<'tcx>)
1056 cache_on_disk_if { true }
1059 query asm_target_features(def_id: DefId) -> &'tcx FxHashSet<Symbol> {
1060 desc { |tcx| "computing target features for inline asm of `{}`", tcx.def_path_str(def_id) }
1063 query fn_arg_names(def_id: DefId) -> &'tcx [rustc_span::symbol::Ident] {
1064 desc { |tcx| "looking up function parameter names for `{}`", tcx.def_path_str(def_id) }
1065 separate_provide_extern
1067 /// Gets the rendered value of the specified constant or associated constant.
1068 /// Used by rustdoc.
1069 query rendered_const(def_id: DefId) -> String {
1070 storage(ArenaCacheSelector<'tcx>)
1071 desc { |tcx| "rendering constant intializer of `{}`", tcx.def_path_str(def_id) }
1072 separate_provide_extern
1074 query impl_parent(def_id: DefId) -> Option<DefId> {
1075 desc { |tcx| "computing specialization parent impl of `{}`", tcx.def_path_str(def_id) }
1076 separate_provide_extern
1079 /// Given an `associated_item`, find the trait it belongs to.
1080 /// Return `None` if the `DefId` is not an associated item.
1081 query trait_of_item(associated_item: DefId) -> Option<DefId> {
1082 desc { |tcx| "finding trait defining `{}`", tcx.def_path_str(associated_item) }
1083 separate_provide_extern
1086 query is_ctfe_mir_available(key: DefId) -> bool {
1087 desc { |tcx| "checking if item has ctfe mir available: `{}`", tcx.def_path_str(key) }
1088 separate_provide_extern
1090 query is_mir_available(key: DefId) -> bool {
1091 desc { |tcx| "checking if item has mir available: `{}`", tcx.def_path_str(key) }
1092 separate_provide_extern
1095 query own_existential_vtable_entries(
1096 key: ty::PolyExistentialTraitRef<'tcx>
1097 ) -> &'tcx [DefId] {
1098 desc { |tcx| "finding all existential vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1101 query vtable_entries(key: ty::PolyTraitRef<'tcx>)
1102 -> &'tcx [ty::VtblEntry<'tcx>] {
1103 desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1106 query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::Ty<'tcx>, ty::Ty<'tcx>)) -> Option<usize> {
1107 desc { |tcx| "finding the slot within vtable for trait object {} vtable ptr during trait upcasting coercion from {} vtable",
1111 query vtable_allocation(key: (Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>)) -> mir::interpret::AllocId {
1112 desc { |tcx| "vtable const allocation for <{} as {}>",
1114 key.1.map(|trait_ref| format!("{}", trait_ref)).unwrap_or("_".to_owned())
1118 query codegen_fulfill_obligation(
1119 key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
1120 ) -> Result<&'tcx ImplSource<'tcx, ()>, ErrorGuaranteed> {
1121 cache_on_disk_if { true }
1123 "checking if `{}` fulfills its obligations",
1124 tcx.def_path_str(key.1.def_id())
1128 /// Return all `impl` blocks in the current crate.
1129 query all_local_trait_impls(_: ()) -> &'tcx rustc_data_structures::fx::FxIndexMap<DefId, Vec<LocalDefId>> {
1130 desc { "local trait impls" }
1133 /// Given a trait `trait_id`, return all known `impl` blocks.
1134 query trait_impls_of(trait_id: DefId) -> ty::trait_def::TraitImpls {
1135 storage(ArenaCacheSelector<'tcx>)
1136 desc { |tcx| "trait impls of `{}`", tcx.def_path_str(trait_id) }
1139 query specialization_graph_of(trait_id: DefId) -> specialization_graph::Graph {
1140 storage(ArenaCacheSelector<'tcx>)
1141 desc { |tcx| "building specialization graph of trait `{}`", tcx.def_path_str(trait_id) }
1142 cache_on_disk_if { true }
1144 query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
1145 desc { |tcx| "determine object safety of trait `{}`", tcx.def_path_str(trait_id) }
1148 /// Gets the ParameterEnvironment for a given item; this environment
1149 /// will be in "user-facing" mode, meaning that it is suitable for
1150 /// type-checking etc, and it does not normalize specializable
1151 /// associated types. This is almost always what you want,
1152 /// unless you are doing MIR optimizations, in which case you
1153 /// might want to use `reveal_all()` method to change modes.
1154 query param_env(def_id: DefId) -> ty::ParamEnv<'tcx> {
1155 desc { |tcx| "computing normalized predicates of `{}`", tcx.def_path_str(def_id) }
1158 /// Like `param_env`, but returns the `ParamEnv` in `Reveal::All` mode.
1159 /// Prefer this over `tcx.param_env(def_id).with_reveal_all_normalized(tcx)`,
1160 /// as this method is more efficient.
1161 query param_env_reveal_all_normalized(def_id: DefId) -> ty::ParamEnv<'tcx> {
1162 desc { |tcx| "computing revealed normalized predicates of `{}`", tcx.def_path_str(def_id) }
1165 /// Trait selection queries. These are best used by invoking `ty.is_copy_modulo_regions()`,
1166 /// `ty.is_copy()`, etc, since that will prune the environment where possible.
1167 query is_copy_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1168 desc { "computing whether `{}` is `Copy`", env.value }
1171 /// Query backing `Ty::is_sized`.
1172 query is_sized_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1173 desc { "computing whether `{}` is `Sized`", env.value }
1176 /// Query backing `Ty::is_freeze`.
1177 query is_freeze_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1178 desc { "computing whether `{}` is freeze", env.value }
1181 /// Query backing `Ty::is_unpin`.
1182 query is_unpin_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1183 desc { "computing whether `{}` is `Unpin`", env.value }
1186 /// Query backing `Ty::needs_drop`.
1187 query needs_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1188 desc { "computing whether `{}` needs drop", env.value }
1191 /// Query backing `Ty::has_significant_drop_raw`.
1192 query has_significant_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1193 desc { "computing whether `{}` has a significant drop", env.value }
1197 /// Query backing `Ty::is_structural_eq_shallow`.
1199 /// This is only correct for ADTs. Call `is_structural_eq_shallow` to handle all types
1201 query has_structural_eq_impls(ty: Ty<'tcx>) -> bool {
1203 "computing whether `{:?}` implements `PartialStructuralEq` and `StructuralEq`",
1208 /// A list of types where the ADT requires drop if and only if any of
1209 /// those types require drop. If the ADT is known to always need drop
1210 /// then `Err(AlwaysRequiresDrop)` is returned.
1211 query adt_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1212 desc { |tcx| "computing when `{}` needs drop", tcx.def_path_str(def_id) }
1213 cache_on_disk_if { true }
1216 /// A list of types where the ADT requires drop if and only if any of those types
1217 /// has significant drop. A type marked with the attribute `rustc_insignificant_dtor`
1218 /// is considered to not be significant. A drop is significant if it is implemented
1219 /// by the user or does anything that will have any observable behavior (other than
1220 /// freeing up memory). If the ADT is known to have a significant destructor then
1221 /// `Err(AlwaysRequiresDrop)` is returned.
1222 query adt_significant_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1223 desc { |tcx| "computing when `{}` has a significant destructor", tcx.def_path_str(def_id) }
1224 cache_on_disk_if { false }
1227 /// Computes the layout of a type. Note that this implicitly
1228 /// executes in "reveal all" mode, and will normalize the input type.
1230 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1231 ) -> Result<ty::layout::TyAndLayout<'tcx>, ty::layout::LayoutError<'tcx>> {
1232 desc { "computing layout of `{}`", key.value }
1236 /// Compute a `FnAbi` suitable for indirect calls, i.e. to `fn` pointers.
1238 /// NB: this doesn't handle virtual calls - those should use `fn_abi_of_instance`
1239 /// instead, where the instance is an `InstanceDef::Virtual`.
1240 query fn_abi_of_fn_ptr(
1241 key: ty::ParamEnvAnd<'tcx, (ty::PolyFnSig<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1242 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1243 desc { "computing call ABI of `{}` function pointers", key.value.0 }
1247 /// Compute a `FnAbi` suitable for declaring/defining an `fn` instance, and for
1248 /// direct calls to an `fn`.
1250 /// NB: that includes virtual calls, which are represented by "direct calls"
1251 /// to an `InstanceDef::Virtual` instance (of `<dyn Trait as Trait>::fn`).
1252 query fn_abi_of_instance(
1253 key: ty::ParamEnvAnd<'tcx, (ty::Instance<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1254 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1255 desc { "computing call ABI of `{}`", key.value.0 }
1259 query dylib_dependency_formats(_: CrateNum)
1260 -> &'tcx [(CrateNum, LinkagePreference)] {
1261 desc { "dylib dependency formats of crate" }
1262 separate_provide_extern
1265 query dependency_formats(_: ()) -> Lrc<crate::middle::dependency_format::Dependencies> {
1266 storage(ArenaCacheSelector<'tcx>)
1267 desc { "get the linkage format of all dependencies" }
1270 query is_compiler_builtins(_: CrateNum) -> bool {
1272 desc { "checking if the crate is_compiler_builtins" }
1273 separate_provide_extern
1275 query has_global_allocator(_: CrateNum) -> bool {
1276 // This query depends on untracked global state in CStore
1279 desc { "checking if the crate has_global_allocator" }
1280 separate_provide_extern
1282 query has_panic_handler(_: CrateNum) -> bool {
1284 desc { "checking if the crate has_panic_handler" }
1285 separate_provide_extern
1287 query is_profiler_runtime(_: CrateNum) -> bool {
1289 desc { "query a crate is `#![profiler_runtime]`" }
1290 separate_provide_extern
1292 query panic_strategy(_: CrateNum) -> PanicStrategy {
1294 desc { "query a crate's configured panic strategy" }
1295 separate_provide_extern
1297 query panic_in_drop_strategy(_: CrateNum) -> PanicStrategy {
1299 desc { "query a crate's configured panic-in-drop strategy" }
1300 separate_provide_extern
1302 query is_no_builtins(_: CrateNum) -> bool {
1304 desc { "test whether a crate has `#![no_builtins]`" }
1305 separate_provide_extern
1307 query symbol_mangling_version(_: CrateNum) -> SymbolManglingVersion {
1309 desc { "query a crate's symbol mangling version" }
1310 separate_provide_extern
1313 query extern_crate(def_id: DefId) -> Option<&'tcx ExternCrate> {
1315 desc { "getting crate's ExternCrateData" }
1316 separate_provide_extern
1319 query specializes(_: (DefId, DefId)) -> bool {
1320 desc { "computing whether impls specialize one another" }
1322 query in_scope_traits_map(_: LocalDefId)
1323 -> Option<&'tcx FxHashMap<ItemLocalId, Box<[TraitCandidate]>>> {
1324 desc { "traits in scope at a block" }
1327 query module_reexports(def_id: LocalDefId) -> Option<&'tcx [ModChild]> {
1328 desc { |tcx| "looking up reexports of module `{}`", tcx.def_path_str(def_id.to_def_id()) }
1331 query impl_defaultness(def_id: DefId) -> hir::Defaultness {
1332 desc { |tcx| "looking up whether `{}` is a default impl", tcx.def_path_str(def_id) }
1333 separate_provide_extern
1336 query check_item_well_formed(key: LocalDefId) -> () {
1337 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1339 query check_trait_item_well_formed(key: LocalDefId) -> () {
1340 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1342 query check_impl_item_well_formed(key: LocalDefId) -> () {
1343 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1346 // The `DefId`s of all non-generic functions and statics in the given crate
1347 // that can be reached from outside the crate.
1349 // We expect this items to be available for being linked to.
1351 // This query can also be called for `LOCAL_CRATE`. In this case it will
1352 // compute which items will be reachable to other crates, taking into account
1353 // the kind of crate that is currently compiled. Crates with only a
1354 // C interface have fewer reachable things.
1356 // Does not include external symbols that don't have a corresponding DefId,
1357 // like the compiler-generated `main` function and so on.
1358 query reachable_non_generics(_: CrateNum)
1359 -> DefIdMap<SymbolExportLevel> {
1360 storage(ArenaCacheSelector<'tcx>)
1361 desc { "looking up the exported symbols of a crate" }
1362 separate_provide_extern
1364 query is_reachable_non_generic(def_id: DefId) -> bool {
1365 desc { |tcx| "checking whether `{}` is an exported symbol", tcx.def_path_str(def_id) }
1366 separate_provide_extern
1368 query is_unreachable_local_definition(def_id: LocalDefId) -> bool {
1370 "checking whether `{}` is reachable from outside the crate",
1371 tcx.def_path_str(def_id.to_def_id()),
1375 /// The entire set of monomorphizations the local crate can safely link
1376 /// to because they are exported from upstream crates. Do not depend on
1377 /// this directly, as its value changes anytime a monomorphization gets
1378 /// added or removed in any upstream crate. Instead use the narrower
1379 /// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
1380 /// better, `Instance::upstream_monomorphization()`.
1381 query upstream_monomorphizations(_: ()) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1382 storage(ArenaCacheSelector<'tcx>)
1383 desc { "collecting available upstream monomorphizations" }
1386 /// Returns the set of upstream monomorphizations available for the
1387 /// generic function identified by the given `def_id`. The query makes
1388 /// sure to make a stable selection if the same monomorphization is
1389 /// available in multiple upstream crates.
1391 /// You likely want to call `Instance::upstream_monomorphization()`
1392 /// instead of invoking this query directly.
1393 query upstream_monomorphizations_for(def_id: DefId)
1394 -> Option<&'tcx FxHashMap<SubstsRef<'tcx>, CrateNum>>
1396 storage(ArenaCacheSelector<'tcx>)
1398 "collecting available upstream monomorphizations for `{}`",
1399 tcx.def_path_str(def_id),
1401 separate_provide_extern
1404 /// Returns the upstream crate that exports drop-glue for the given
1405 /// type (`substs` is expected to be a single-item list containing the
1406 /// type one wants drop-glue for).
1408 /// This is a subset of `upstream_monomorphizations_for` in order to
1409 /// increase dep-tracking granularity. Otherwise adding or removing any
1410 /// type with drop-glue in any upstream crate would invalidate all
1411 /// functions calling drop-glue of an upstream type.
1413 /// You likely want to call `Instance::upstream_monomorphization()`
1414 /// instead of invoking this query directly.
1416 /// NOTE: This query could easily be extended to also support other
1417 /// common functions that have are large set of monomorphizations
1418 /// (like `Clone::clone` for example).
1419 query upstream_drop_glue_for(substs: SubstsRef<'tcx>) -> Option<CrateNum> {
1420 desc { "available upstream drop-glue for `{:?}`", substs }
1423 query foreign_modules(_: CrateNum) -> FxHashMap<DefId, ForeignModule> {
1424 storage(ArenaCacheSelector<'tcx>)
1425 desc { "looking up the foreign modules of a linked crate" }
1426 separate_provide_extern
1429 /// Identifies the entry-point (e.g., the `main` function) for a given
1430 /// crate, returning `None` if there is no entry point (such as for library crates).
1431 query entry_fn(_: ()) -> Option<(DefId, EntryFnType)> {
1432 desc { "looking up the entry function of a crate" }
1434 query proc_macro_decls_static(_: ()) -> Option<LocalDefId> {
1435 desc { "looking up the derive registrar for a crate" }
1437 // The macro which defines `rustc_metadata::provide_extern` depends on this query's name.
1438 // Changing the name should cause a compiler error, but in case that changes, be aware.
1439 query crate_hash(_: CrateNum) -> Svh {
1441 desc { "looking up the hash a crate" }
1442 separate_provide_extern
1444 query crate_host_hash(_: CrateNum) -> Option<Svh> {
1446 desc { "looking up the hash of a host version of a crate" }
1447 separate_provide_extern
1449 query extra_filename(_: CrateNum) -> String {
1450 storage(ArenaCacheSelector<'tcx>)
1452 desc { "looking up the extra filename for a crate" }
1453 separate_provide_extern
1455 query crate_extern_paths(_: CrateNum) -> Vec<PathBuf> {
1456 storage(ArenaCacheSelector<'tcx>)
1458 desc { "looking up the paths for extern crates" }
1459 separate_provide_extern
1462 /// Given a crate and a trait, look up all impls of that trait in the crate.
1463 /// Return `(impl_id, self_ty)`.
1464 query implementations_of_trait(_: (CrateNum, DefId)) -> &'tcx [(DefId, Option<SimplifiedType>)] {
1465 desc { "looking up implementations of a trait in a crate" }
1466 separate_provide_extern
1469 /// Collects all incoherent impls for the given crate and type.
1471 /// Do not call this directly, but instead use the `incoherent_impls` query.
1472 /// This query is only used to get the data necessary for that query.
1473 query crate_incoherent_impls(key: (CrateNum, SimplifiedType)) -> &'tcx [DefId] {
1474 desc { |tcx| "collecting all impls for a type in a crate" }
1475 separate_provide_extern
1478 query is_dllimport_foreign_item(def_id: DefId) -> bool {
1479 desc { |tcx| "is_dllimport_foreign_item({})", tcx.def_path_str(def_id) }
1481 query is_statically_included_foreign_item(def_id: DefId) -> bool {
1482 desc { |tcx| "is_statically_included_foreign_item({})", tcx.def_path_str(def_id) }
1484 query native_library_kind(def_id: DefId)
1485 -> Option<NativeLibKind> {
1486 desc { |tcx| "native_library_kind({})", tcx.def_path_str(def_id) }
1489 /// Does lifetime resolution, but does not descend into trait items. This
1490 /// should only be used for resolving lifetimes of on trait definitions,
1491 /// and is used to avoid cycles. Importantly, `resolve_lifetimes` still visits
1492 /// the same lifetimes and is responsible for diagnostics.
1493 /// See `rustc_resolve::late::lifetimes for details.
1494 query resolve_lifetimes_trait_definition(_: LocalDefId) -> ResolveLifetimes {
1495 storage(ArenaCacheSelector<'tcx>)
1496 desc { "resolving lifetimes for a trait definition" }
1498 /// Does lifetime resolution on items. Importantly, we can't resolve
1499 /// lifetimes directly on things like trait methods, because of trait params.
1500 /// See `rustc_resolve::late::lifetimes for details.
1501 query resolve_lifetimes(_: LocalDefId) -> ResolveLifetimes {
1502 storage(ArenaCacheSelector<'tcx>)
1503 desc { "resolving lifetimes" }
1505 query named_region_map(_: LocalDefId) ->
1506 Option<&'tcx FxHashMap<ItemLocalId, Region>> {
1507 desc { "looking up a named region" }
1509 query is_late_bound_map(_: LocalDefId) ->
1510 Option<(LocalDefId, &'tcx FxHashSet<ItemLocalId>)> {
1511 desc { "testing if a region is late bound" }
1513 /// For a given item (like a struct), gets the default lifetimes to be used
1514 /// for each parameter if a trait object were to be passed for that parameter.
1515 /// For example, for `struct Foo<'a, T, U>`, this would be `['static, 'static]`.
1516 /// For `struct Foo<'a, T: 'a, U>`, this would instead be `['a, 'static]`.
1517 query object_lifetime_defaults(_: LocalDefId) -> Option<&'tcx [ObjectLifetimeDefault]> {
1518 desc { "looking up lifetime defaults for a region on an item" }
1520 query late_bound_vars_map(_: LocalDefId)
1521 -> Option<&'tcx FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
1522 desc { "looking up late bound vars" }
1525 query lifetime_scope_map(_: LocalDefId) -> Option<FxHashMap<ItemLocalId, LifetimeScopeForPath>> {
1526 storage(ArenaCacheSelector<'tcx>)
1527 desc { "finds the lifetime scope for an HirId of a PathSegment" }
1530 query visibility(def_id: DefId) -> ty::Visibility {
1531 desc { |tcx| "computing visibility of `{}`", tcx.def_path_str(def_id) }
1532 separate_provide_extern
1535 /// Computes the set of modules from which this type is visibly uninhabited.
1536 /// To check whether a type is uninhabited at all (not just from a given module), you could
1537 /// check whether the forest is empty.
1538 query type_uninhabited_from(
1539 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1540 ) -> ty::inhabitedness::DefIdForest<'tcx> {
1541 desc { "computing the inhabitedness of `{:?}`", key }
1545 query dep_kind(_: CrateNum) -> CrateDepKind {
1547 desc { "fetching what a dependency looks like" }
1548 separate_provide_extern
1551 /// Gets the name of the crate.
1552 query crate_name(_: CrateNum) -> Symbol {
1554 desc { "fetching what a crate is named" }
1555 separate_provide_extern
1557 query module_children(def_id: DefId) -> &'tcx [ModChild] {
1558 desc { |tcx| "collecting child items of module `{}`", tcx.def_path_str(def_id) }
1559 separate_provide_extern
1561 query extern_mod_stmt_cnum(def_id: LocalDefId) -> Option<CrateNum> {
1562 desc { |tcx| "computing crate imported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1565 query lib_features(_: ()) -> LibFeatures {
1566 storage(ArenaCacheSelector<'tcx>)
1567 desc { "calculating the lib features map" }
1569 query defined_lib_features(_: CrateNum)
1570 -> &'tcx [(Symbol, Option<Symbol>)] {
1571 desc { "calculating the lib features defined in a crate" }
1572 separate_provide_extern
1574 /// Returns the lang items defined in another crate by loading it from metadata.
1575 query get_lang_items(_: ()) -> LanguageItems {
1576 storage(ArenaCacheSelector<'tcx>)
1578 desc { "calculating the lang items map" }
1581 /// Returns all diagnostic items defined in all crates.
1582 query all_diagnostic_items(_: ()) -> rustc_hir::diagnostic_items::DiagnosticItems {
1583 storage(ArenaCacheSelector<'tcx>)
1585 desc { "calculating the diagnostic items map" }
1588 /// Returns the lang items defined in another crate by loading it from metadata.
1589 query defined_lang_items(_: CrateNum) -> &'tcx [(DefId, usize)] {
1590 desc { "calculating the lang items defined in a crate" }
1591 separate_provide_extern
1594 /// Returns the diagnostic items defined in a crate.
1595 query diagnostic_items(_: CrateNum) -> rustc_hir::diagnostic_items::DiagnosticItems {
1596 storage(ArenaCacheSelector<'tcx>)
1597 desc { "calculating the diagnostic items map in a crate" }
1598 separate_provide_extern
1601 query missing_lang_items(_: CrateNum) -> &'tcx [LangItem] {
1602 desc { "calculating the missing lang items in a crate" }
1603 separate_provide_extern
1605 query visible_parent_map(_: ()) -> DefIdMap<DefId> {
1606 storage(ArenaCacheSelector<'tcx>)
1607 desc { "calculating the visible parent map" }
1609 query trimmed_def_paths(_: ()) -> FxHashMap<DefId, Symbol> {
1610 storage(ArenaCacheSelector<'tcx>)
1611 desc { "calculating trimmed def paths" }
1613 query missing_extern_crate_item(_: CrateNum) -> bool {
1615 desc { "seeing if we're missing an `extern crate` item for this crate" }
1616 separate_provide_extern
1618 query used_crate_source(_: CrateNum) -> Lrc<CrateSource> {
1619 storage(ArenaCacheSelector<'tcx>)
1621 desc { "looking at the source for a crate" }
1622 separate_provide_extern
1624 query postorder_cnums(_: ()) -> &'tcx [CrateNum] {
1626 desc { "generating a postorder list of CrateNums" }
1628 /// Returns whether or not the crate with CrateNum 'cnum'
1629 /// is marked as a private dependency
1630 query is_private_dep(c: CrateNum) -> bool {
1632 desc { "check whether crate {} is a private dependency", c }
1633 separate_provide_extern
1635 query allocator_kind(_: ()) -> Option<AllocatorKind> {
1637 desc { "allocator kind for the current crate" }
1640 query upvars_mentioned(def_id: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
1641 desc { |tcx| "collecting upvars mentioned in `{}`", tcx.def_path_str(def_id) }
1643 query maybe_unused_trait_import(def_id: LocalDefId) -> bool {
1644 desc { |tcx| "maybe_unused_trait_import for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1646 query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
1647 desc { "looking up all possibly unused extern crates" }
1649 query names_imported_by_glob_use(def_id: LocalDefId) -> &'tcx FxHashSet<Symbol> {
1650 desc { |tcx| "names_imported_by_glob_use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1653 query stability_index(_: ()) -> stability::Index {
1654 storage(ArenaCacheSelector<'tcx>)
1656 desc { "calculating the stability index for the local crate" }
1658 query crates(_: ()) -> &'tcx [CrateNum] {
1660 desc { "fetching all foreign CrateNum instances" }
1663 /// A list of all traits in a crate, used by rustdoc and error reporting.
1664 /// NOTE: Not named just `traits` due to a naming conflict.
1665 query traits_in_crate(_: CrateNum) -> &'tcx [DefId] {
1666 desc { "fetching all traits in a crate" }
1667 separate_provide_extern
1670 /// The list of symbols exported from the given crate.
1672 /// - All names contained in `exported_symbols(cnum)` are guaranteed to
1673 /// correspond to a publicly visible symbol in `cnum` machine code.
1674 /// - The `exported_symbols` sets of different crates do not intersect.
1675 query exported_symbols(_: CrateNum)
1676 -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1677 desc { "exported_symbols" }
1678 separate_provide_extern
1681 query collect_and_partition_mono_items(_: ()) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
1683 desc { "collect_and_partition_mono_items" }
1685 query is_codegened_item(def_id: DefId) -> bool {
1686 desc { |tcx| "determining whether `{}` needs codegen", tcx.def_path_str(def_id) }
1689 /// All items participating in code generation together with items inlined into them.
1690 query codegened_and_inlined_items(_: ()) -> &'tcx DefIdSet {
1692 desc { "codegened_and_inlined_items" }
1695 query codegen_unit(_: Symbol) -> &'tcx CodegenUnit<'tcx> {
1696 desc { "codegen_unit" }
1698 query unused_generic_params(key: ty::InstanceDef<'tcx>) -> FiniteBitSet<u32> {
1699 cache_on_disk_if { key.def_id().is_local() }
1701 |tcx| "determining which generic parameters are unused by `{}`",
1702 tcx.def_path_str(key.def_id())
1704 separate_provide_extern
1706 query backend_optimization_level(_: ()) -> OptLevel {
1707 desc { "optimization level used by backend" }
1710 /// Return the filenames where output artefacts shall be stored.
1712 /// This query returns an `&Arc` because codegen backends need the value even after the `TyCtxt`
1713 /// has been destroyed.
1714 query output_filenames(_: ()) -> &'tcx Arc<OutputFilenames> {
1716 desc { "output_filenames" }
1719 /// Do not call this query directly: invoke `normalize` instead.
1720 query normalize_projection_ty(
1721 goal: CanonicalProjectionGoal<'tcx>
1723 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, NormalizationResult<'tcx>>>,
1726 desc { "normalizing `{:?}`", goal }
1730 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1731 query try_normalize_generic_arg_after_erasing_regions(
1732 goal: ParamEnvAnd<'tcx, GenericArg<'tcx>>
1733 ) -> Result<GenericArg<'tcx>, NoSolution> {
1734 desc { "normalizing `{}`", goal.value }
1738 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1739 query try_normalize_mir_const_after_erasing_regions(
1740 goal: ParamEnvAnd<'tcx, mir::ConstantKind<'tcx>>
1741 ) -> Result<mir::ConstantKind<'tcx>, NoSolution> {
1742 desc { "normalizing `{}`", goal.value }
1746 query implied_outlives_bounds(
1747 goal: CanonicalTyGoal<'tcx>
1749 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Vec<OutlivesBound<'tcx>>>>,
1752 desc { "computing implied outlives bounds for `{:?}`", goal }
1756 /// Do not call this query directly: invoke `infcx.at().dropck_outlives()` instead.
1757 query dropck_outlives(
1758 goal: CanonicalTyGoal<'tcx>
1760 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>,
1763 desc { "computing dropck types for `{:?}`", goal }
1767 /// Do not call this query directly: invoke `infcx.predicate_may_hold()` or
1768 /// `infcx.predicate_must_hold()` instead.
1769 query evaluate_obligation(
1770 goal: CanonicalPredicateGoal<'tcx>
1771 ) -> Result<traits::EvaluationResult, traits::OverflowError> {
1772 desc { "evaluating trait selection obligation `{}`", goal.value.value }
1775 query evaluate_goal(
1776 goal: traits::CanonicalChalkEnvironmentAndGoal<'tcx>
1778 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1781 desc { "evaluating trait selection obligation `{}`", goal.value }
1784 /// Do not call this query directly: part of the `Eq` type-op
1785 query type_op_ascribe_user_type(
1786 goal: CanonicalTypeOpAscribeUserTypeGoal<'tcx>
1788 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1791 desc { "evaluating `type_op_ascribe_user_type` `{:?}`", goal }
1795 /// Do not call this query directly: part of the `Eq` type-op
1797 goal: CanonicalTypeOpEqGoal<'tcx>
1799 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1802 desc { "evaluating `type_op_eq` `{:?}`", goal }
1806 /// Do not call this query directly: part of the `Subtype` type-op
1807 query type_op_subtype(
1808 goal: CanonicalTypeOpSubtypeGoal<'tcx>
1810 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1813 desc { "evaluating `type_op_subtype` `{:?}`", goal }
1817 /// Do not call this query directly: part of the `ProvePredicate` type-op
1818 query type_op_prove_predicate(
1819 goal: CanonicalTypeOpProvePredicateGoal<'tcx>
1821 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1824 desc { "evaluating `type_op_prove_predicate` `{:?}`", goal }
1827 /// Do not call this query directly: part of the `Normalize` type-op
1828 query type_op_normalize_ty(
1829 goal: CanonicalTypeOpNormalizeGoal<'tcx, Ty<'tcx>>
1831 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Ty<'tcx>>>,
1834 desc { "normalizing `{:?}`", goal }
1838 /// Do not call this query directly: part of the `Normalize` type-op
1839 query type_op_normalize_predicate(
1840 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::Predicate<'tcx>>
1842 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::Predicate<'tcx>>>,
1845 desc { "normalizing `{:?}`", goal }
1849 /// Do not call this query directly: part of the `Normalize` type-op
1850 query type_op_normalize_poly_fn_sig(
1851 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::PolyFnSig<'tcx>>
1853 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::PolyFnSig<'tcx>>>,
1856 desc { "normalizing `{:?}`", goal }
1860 /// Do not call this query directly: part of the `Normalize` type-op
1861 query type_op_normalize_fn_sig(
1862 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::FnSig<'tcx>>
1864 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::FnSig<'tcx>>>,
1867 desc { "normalizing `{:?}`", goal }
1871 query subst_and_check_impossible_predicates(key: (DefId, SubstsRef<'tcx>)) -> bool {
1873 "impossible substituted predicates:`{}`",
1874 tcx.def_path_str(key.0)
1878 query method_autoderef_steps(
1879 goal: CanonicalTyGoal<'tcx>
1880 ) -> MethodAutoderefStepsResult<'tcx> {
1881 desc { "computing autoderef types for `{:?}`", goal }
1885 query supported_target_features(_: CrateNum) -> FxHashMap<String, Option<Symbol>> {
1886 storage(ArenaCacheSelector<'tcx>)
1888 desc { "looking up supported target features" }
1891 /// Get an estimate of the size of an InstanceDef based on its MIR for CGU partitioning.
1892 query instance_def_size_estimate(def: ty::InstanceDef<'tcx>)
1894 desc { |tcx| "estimating size for `{}`", tcx.def_path_str(def.def_id()) }
1897 query features_query(_: ()) -> &'tcx rustc_feature::Features {
1899 desc { "looking up enabled feature gates" }
1902 /// Attempt to resolve the given `DefId` to an `Instance`, for the
1903 /// given generics args (`SubstsRef`), returning one of:
1904 /// * `Ok(Some(instance))` on success
1905 /// * `Ok(None)` when the `SubstsRef` are still too generic,
1906 /// and therefore don't allow finding the final `Instance`
1907 /// * `Err(ErrorGuaranteed)` when the `Instance` resolution process
1908 /// couldn't complete due to errors elsewhere - this is distinct
1909 /// from `Ok(None)` to avoid misleading diagnostics when an error
1910 /// has already been/will be emitted, for the original cause
1911 query resolve_instance(
1912 key: ty::ParamEnvAnd<'tcx, (DefId, SubstsRef<'tcx>)>
1913 ) -> Result<Option<ty::Instance<'tcx>>, ErrorGuaranteed> {
1914 desc { "resolving instance `{}`", ty::Instance::new(key.value.0, key.value.1) }
1918 query resolve_instance_of_const_arg(
1919 key: ty::ParamEnvAnd<'tcx, (LocalDefId, DefId, SubstsRef<'tcx>)>
1920 ) -> Result<Option<ty::Instance<'tcx>>, ErrorGuaranteed> {
1922 "resolving instance of the const argument `{}`",
1923 ty::Instance::new(key.value.0.to_def_id(), key.value.2),
1928 query normalize_opaque_types(key: &'tcx ty::List<ty::Predicate<'tcx>>) -> &'tcx ty::List<ty::Predicate<'tcx>> {
1929 desc { "normalizing opaque types in {:?}", key }
1932 /// Checks whether a type is definitely uninhabited. This is
1933 /// conservative: for some types that are uninhabited we return `false`,
1934 /// but we only return `true` for types that are definitely uninhabited.
1935 /// `ty.conservative_is_privately_uninhabited` implies that any value of type `ty`
1936 /// will be `Abi::Uninhabited`. (Note that uninhabited types may have nonzero
1937 /// size, to account for partial initialisation. See #49298 for details.)
1938 query conservative_is_privately_uninhabited(key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1939 desc { "conservatively checking if {:?} is privately uninhabited", key }
1943 query limits(key: ()) -> Limits {
1944 desc { "looking up limits" }
1947 /// Performs an HIR-based well-formed check on the item with the given `HirId`. If
1948 /// we get an `Unimplemented` error that matches the provided `Predicate`, return
1949 /// the cause of the newly created obligation.
1951 /// This is only used by error-reporting code to get a better cause (in particular, a better
1952 /// span) for an *existing* error. Therefore, it is best-effort, and may never handle
1953 /// all of the cases that the normal `ty::Ty`-based wfcheck does. This is fine,
1954 /// because the `ty::Ty`-based wfcheck is always run.
1955 query diagnostic_hir_wf_check(key: (ty::Predicate<'tcx>, traits::WellFormedLoc)) -> Option<traits::ObligationCause<'tcx>> {
1956 storage(ArenaCacheSelector<'tcx>)
1959 desc { "performing HIR wf-checking for predicate {:?} at item {:?}", key.0, key.1 }
1963 /// The list of backend features computed from CLI flags (`-Ctarget-cpu`, `-Ctarget-feature`,
1964 /// `--target` and similar).
1965 query global_backend_features(_: ()) -> Vec<String> {
1966 storage(ArenaCacheSelector<'tcx>)
1968 desc { "computing the backend features for CLI flags" }