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>) -> (&'tcx Steal<thir::Thir<'tcx>>, thir::ExprId) {
256 // Perf tests revealed that hashing THIR is inefficient (see #85729).
258 desc { |tcx| "building THIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
261 /// Create a THIR tree for debugging.
262 query thir_tree(key: ty::WithOptConstParam<LocalDefId>) -> String {
264 storage(ArenaCacheSelector<'tcx>)
265 desc { |tcx| "constructing THIR tree for `{}`", tcx.def_path_str(key.did.to_def_id()) }
268 /// Set of all the `DefId`s in this crate that have MIR associated with
269 /// them. This includes all the body owners, but also things like struct
271 query mir_keys(_: ()) -> rustc_data_structures::fx::FxIndexSet<LocalDefId> {
272 storage(ArenaCacheSelector<'tcx>)
273 desc { "getting a list of all mir_keys" }
276 /// Maps DefId's that have an associated `mir::Body` to the result
277 /// of the MIR const-checking pass. This is the set of qualifs in
278 /// the final value of a `const`.
279 query mir_const_qualif(key: DefId) -> mir::ConstQualifs {
280 desc { |tcx| "const checking `{}`", tcx.def_path_str(key) }
281 cache_on_disk_if { key.is_local() }
282 separate_provide_extern
284 query mir_const_qualif_const_arg(
285 key: (LocalDefId, DefId)
286 ) -> mir::ConstQualifs {
288 |tcx| "const checking the const argument `{}`",
289 tcx.def_path_str(key.0.to_def_id())
293 /// Fetch the MIR for a given `DefId` right after it's built - this includes
294 /// unreachable code.
295 query mir_built(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
296 desc { |tcx| "building MIR for `{}`", tcx.def_path_str(key.did.to_def_id()) }
299 /// Fetch the MIR for a given `DefId` up till the point where it is
300 /// ready for const qualification.
302 /// See the README for the `mir` module for details.
303 query mir_const(key: ty::WithOptConstParam<LocalDefId>) -> &'tcx Steal<mir::Body<'tcx>> {
305 |tcx| "processing MIR for {}`{}`",
306 if key.const_param_did.is_some() { "the const argument " } else { "" },
307 tcx.def_path_str(key.did.to_def_id()),
312 /// Try to build an abstract representation of the given constant.
313 query thir_abstract_const(
315 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorGuaranteed> {
317 |tcx| "building an abstract representation for {}", tcx.def_path_str(key),
319 separate_provide_extern
321 /// Try to build an abstract representation of the given constant.
322 query thir_abstract_const_of_const_arg(
323 key: (LocalDefId, DefId)
324 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorGuaranteed> {
327 "building an abstract representation for the const argument {}",
328 tcx.def_path_str(key.0.to_def_id()),
332 query try_unify_abstract_consts(key: (
333 ty::Unevaluated<'tcx, ()>, ty::Unevaluated<'tcx, ()>
336 |tcx| "trying to unify the generic constants {} and {}",
337 tcx.def_path_str(key.0.def.did), tcx.def_path_str(key.1.def.did)
341 query mir_drops_elaborated_and_const_checked(
342 key: ty::WithOptConstParam<LocalDefId>
343 ) -> &'tcx Steal<mir::Body<'tcx>> {
345 desc { |tcx| "elaborating drops for `{}`", tcx.def_path_str(key.did.to_def_id()) }
350 ) -> &'tcx mir::Body<'tcx> {
351 desc { |tcx| "caching mir of `{}` for CTFE", tcx.def_path_str(key) }
352 cache_on_disk_if { key.is_local() }
353 separate_provide_extern
356 query mir_for_ctfe_of_const_arg(key: (LocalDefId, DefId)) -> &'tcx mir::Body<'tcx> {
358 |tcx| "MIR for CTFE of the const argument `{}`",
359 tcx.def_path_str(key.0.to_def_id())
363 query mir_promoted(key: ty::WithOptConstParam<LocalDefId>) ->
365 &'tcx Steal<mir::Body<'tcx>>,
366 &'tcx Steal<IndexVec<mir::Promoted, mir::Body<'tcx>>>
370 |tcx| "processing {}`{}`",
371 if key.const_param_did.is_some() { "the const argument " } else { "" },
372 tcx.def_path_str(key.did.to_def_id()),
376 query symbols_for_closure_captures(
377 key: (LocalDefId, DefId)
378 ) -> Vec<rustc_span::Symbol> {
379 storage(ArenaCacheSelector<'tcx>)
381 |tcx| "symbols for captures of closure `{}` in `{}`",
382 tcx.def_path_str(key.1),
383 tcx.def_path_str(key.0.to_def_id())
387 /// MIR after our optimization passes have run. This is MIR that is ready
388 /// for codegen. This is also the only query that can fetch non-local MIR, at present.
389 query optimized_mir(key: DefId) -> &'tcx mir::Body<'tcx> {
390 desc { |tcx| "optimizing MIR for `{}`", tcx.def_path_str(key) }
391 cache_on_disk_if { key.is_local() }
392 separate_provide_extern
395 /// Returns coverage summary info for a function, after executing the `InstrumentCoverage`
396 /// MIR pass (assuming the -Cinstrument-coverage option is enabled).
397 query coverageinfo(key: ty::InstanceDef<'tcx>) -> mir::CoverageInfo {
398 desc { |tcx| "retrieving coverage info from MIR for `{}`", tcx.def_path_str(key.def_id()) }
399 storage(ArenaCacheSelector<'tcx>)
402 /// Returns the `CodeRegions` for a function that has instrumented coverage, in case the
403 /// function was optimized out before codegen, and before being added to the Coverage Map.
404 query covered_code_regions(key: DefId) -> Vec<&'tcx mir::coverage::CodeRegion> {
406 |tcx| "retrieving the covered `CodeRegion`s, if instrumented, for `{}`",
407 tcx.def_path_str(key)
409 storage(ArenaCacheSelector<'tcx>)
410 cache_on_disk_if { key.is_local() }
413 /// The `DefId` is the `DefId` of the containing MIR body. Promoteds do not have their own
414 /// `DefId`. This function returns all promoteds in the specified body. The body references
415 /// promoteds by the `DefId` and the `mir::Promoted` index. This is necessary, because
416 /// after inlining a body may refer to promoteds from other bodies. In that case you still
417 /// need to use the `DefId` of the original body.
418 query promoted_mir(key: DefId) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
419 desc { |tcx| "optimizing promoted MIR for `{}`", tcx.def_path_str(key) }
420 cache_on_disk_if { key.is_local() }
421 separate_provide_extern
423 query promoted_mir_of_const_arg(
424 key: (LocalDefId, DefId)
425 ) -> &'tcx IndexVec<mir::Promoted, mir::Body<'tcx>> {
427 |tcx| "optimizing promoted MIR for the const argument `{}`",
428 tcx.def_path_str(key.0.to_def_id()),
432 /// Erases regions from `ty` to yield a new type.
433 /// Normally you would just use `tcx.erase_regions(value)`,
434 /// however, which uses this query as a kind of cache.
435 query erase_regions_ty(ty: Ty<'tcx>) -> Ty<'tcx> {
436 // This query is not expected to have input -- as a result, it
437 // is not a good candidates for "replay" because it is essentially a
438 // pure function of its input (and hence the expectation is that
439 // no caller would be green **apart** from just these
440 // queries). Making it anonymous avoids hashing the result, which
441 // may save a bit of time.
443 desc { "erasing regions from `{:?}`", ty }
446 query wasm_import_module_map(_: CrateNum) -> FxHashMap<DefId, String> {
447 storage(ArenaCacheSelector<'tcx>)
448 desc { "wasm import module map" }
451 /// Maps from the `DefId` of an item (trait/struct/enum/fn) to the
452 /// predicates (where-clauses) directly defined on it. This is
453 /// equal to the `explicit_predicates_of` predicates plus the
454 /// `inferred_outlives_of` predicates.
455 query predicates_defined_on(key: DefId) -> ty::GenericPredicates<'tcx> {
456 desc { |tcx| "computing predicates of `{}`", tcx.def_path_str(key) }
459 /// Returns everything that looks like a predicate written explicitly
460 /// by the user on a trait item.
462 /// Traits are unusual, because predicates on associated types are
463 /// converted into bounds on that type for backwards compatibility:
465 /// trait X where Self::U: Copy { type U; }
469 /// trait X { type U: Copy; }
471 /// `explicit_predicates_of` and `explicit_item_bounds` will then take
472 /// the appropriate subsets of the predicates here.
473 query trait_explicit_predicates_and_bounds(key: LocalDefId) -> ty::GenericPredicates<'tcx> {
474 desc { |tcx| "computing explicit predicates of trait `{}`", tcx.def_path_str(key.to_def_id()) }
477 /// Returns the predicates written explicitly by the user.
478 query explicit_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
479 desc { |tcx| "computing explicit predicates of `{}`", tcx.def_path_str(key) }
480 separate_provide_extern
483 /// Returns the inferred outlives predicates (e.g., for `struct
484 /// Foo<'a, T> { x: &'a T }`, this would return `T: 'a`).
485 query inferred_outlives_of(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
486 desc { |tcx| "computing inferred outlives predicates of `{}`", tcx.def_path_str(key) }
487 separate_provide_extern
490 /// Maps from the `DefId` of a trait to the list of
491 /// super-predicates. This is a subset of the full list of
492 /// predicates. We store these in a separate map because we must
493 /// evaluate them even during type conversion, often before the
494 /// full predicates are available (note that supertraits have
495 /// additional acyclicity requirements).
496 query super_predicates_of(key: DefId) -> ty::GenericPredicates<'tcx> {
497 desc { |tcx| "computing the super predicates of `{}`", tcx.def_path_str(key) }
498 separate_provide_extern
501 /// The `Option<Ident>` is the name of an associated type. If it is `None`, then this query
502 /// returns the full set of predicates. If `Some<Ident>`, then the query returns only the
503 /// subset of super-predicates that reference traits that define the given associated type.
504 /// This is used to avoid cycles in resolving types like `T::Item`.
505 query super_predicates_that_define_assoc_type(key: (DefId, Option<rustc_span::symbol::Ident>)) -> ty::GenericPredicates<'tcx> {
506 desc { |tcx| "computing the super traits of `{}`{}",
507 tcx.def_path_str(key.0),
508 if let Some(assoc_name) = key.1 { format!(" with associated type name `{}`", assoc_name) } else { "".to_string() },
512 /// To avoid cycles within the predicates of a single item we compute
513 /// per-type-parameter predicates for resolving `T::AssocTy`.
514 query type_param_predicates(key: (DefId, LocalDefId, rustc_span::symbol::Ident)) -> ty::GenericPredicates<'tcx> {
515 desc { |tcx| "computing the bounds for type parameter `{}`", {
516 let id = tcx.hir().local_def_id_to_hir_id(key.1);
517 tcx.hir().ty_param_name(id)
521 query trait_def(key: DefId) -> ty::TraitDef {
522 desc { |tcx| "computing trait definition for `{}`", tcx.def_path_str(key) }
523 storage(ArenaCacheSelector<'tcx>)
524 separate_provide_extern
526 query adt_def(key: DefId) -> &'tcx ty::AdtDef {
527 desc { |tcx| "computing ADT definition for `{}`", tcx.def_path_str(key) }
528 cache_on_disk_if { key.is_local() }
529 separate_provide_extern
531 query adt_destructor(key: DefId) -> Option<ty::Destructor> {
532 desc { |tcx| "computing `Drop` impl for `{}`", tcx.def_path_str(key) }
533 separate_provide_extern
536 // The cycle error here should be reported as an error by `check_representable`.
537 // We consider the type as Sized in the meanwhile to avoid
538 // further errors (done in impl Value for AdtSizedConstraint).
539 // Use `cycle_delay_bug` to delay the cycle error here to be emitted later
540 // in case we accidentally otherwise don't emit an error.
541 query adt_sized_constraint(
543 ) -> AdtSizedConstraint<'tcx> {
544 desc { |tcx| "computing `Sized` constraints for `{}`", tcx.def_path_str(key) }
548 query adt_dtorck_constraint(
550 ) -> Result<&'tcx DtorckConstraint<'tcx>, NoSolution> {
551 desc { |tcx| "computing drop-check constraints for `{}`", tcx.def_path_str(key) }
554 /// Returns `true` if this is a const fn, use the `is_const_fn` to know whether your crate
555 /// actually sees it as const fn (e.g., the const-fn-ness might be unstable and you might
556 /// not have the feature gate active).
558 /// **Do not call this function manually.** It is only meant to cache the base data for the
559 /// `is_const_fn` function.
560 query is_const_fn_raw(key: DefId) -> bool {
561 desc { |tcx| "checking if item is const fn: `{}`", tcx.def_path_str(key) }
562 separate_provide_extern
565 query asyncness(key: DefId) -> hir::IsAsync {
566 desc { |tcx| "checking if the function is async: `{}`", tcx.def_path_str(key) }
567 separate_provide_extern
570 /// Returns `true` if calls to the function may be promoted.
572 /// This is either because the function is e.g., a tuple-struct or tuple-variant
573 /// constructor, or because it has the `#[rustc_promotable]` attribute. The attribute should
574 /// be removed in the future in favour of some form of check which figures out whether the
575 /// function does not inspect the bits of any of its arguments (so is essentially just a
576 /// constructor function).
577 query is_promotable_const_fn(key: DefId) -> bool {
578 desc { |tcx| "checking if item is promotable: `{}`", tcx.def_path_str(key) }
581 /// Returns `true` if this is a foreign item (i.e., linked via `extern { ... }`).
582 query is_foreign_item(key: DefId) -> bool {
583 desc { |tcx| "checking if `{}` is a foreign item", tcx.def_path_str(key) }
584 separate_provide_extern
587 /// Returns `Some(mutability)` if the node pointed to by `def_id` is a static item.
588 query static_mutability(def_id: DefId) -> Option<hir::Mutability> {
589 desc { |tcx| "looking up static mutability of `{}`", tcx.def_path_str(def_id) }
590 separate_provide_extern
593 /// Returns `Some(generator_kind)` if the node pointed to by `def_id` is a generator.
594 query generator_kind(def_id: DefId) -> Option<hir::GeneratorKind> {
595 desc { |tcx| "looking up generator kind of `{}`", tcx.def_path_str(def_id) }
596 separate_provide_extern
599 /// Gets a map with the variance of every item; use `item_variance` instead.
600 query crate_variances(_: ()) -> ty::CrateVariancesMap<'tcx> {
601 storage(ArenaCacheSelector<'tcx>)
602 desc { "computing the variances for items in this crate" }
605 /// Maps from the `DefId` of a type or region parameter to its (inferred) variance.
606 query variances_of(def_id: DefId) -> &'tcx [ty::Variance] {
607 desc { |tcx| "computing the variances of `{}`", tcx.def_path_str(def_id) }
608 separate_provide_extern
611 /// Maps from thee `DefId` of a type to its (inferred) outlives.
612 query inferred_outlives_crate(_: ()) -> ty::CratePredicatesMap<'tcx> {
613 storage(ArenaCacheSelector<'tcx>)
614 desc { "computing the inferred outlives predicates for items in this crate" }
617 /// Maps from an impl/trait `DefId` to a list of the `DefId`s of its items.
618 query associated_item_def_ids(key: DefId) -> &'tcx [DefId] {
619 desc { |tcx| "collecting associated items of `{}`", tcx.def_path_str(key) }
620 separate_provide_extern
623 /// Maps from a trait item to the trait item "descriptor".
624 query associated_item(key: DefId) -> ty::AssocItem {
625 desc { |tcx| "computing associated item data for `{}`", tcx.def_path_str(key) }
626 storage(ArenaCacheSelector<'tcx>)
627 separate_provide_extern
630 /// Collects the associated items defined on a trait or impl.
631 query associated_items(key: DefId) -> ty::AssocItems<'tcx> {
632 storage(ArenaCacheSelector<'tcx>)
633 desc { |tcx| "collecting associated items of {}", tcx.def_path_str(key) }
636 /// Maps from associated items on a trait to the corresponding associated
637 /// item on the impl specified by `impl_id`.
639 /// For example, with the following code
644 /// trait Trait { // trait_id
645 /// fn f(); // trait_f
646 /// fn g() {} // trait_g
649 /// impl Trait for Type { // impl_id
650 /// fn f() {} // impl_f
651 /// fn g() {} // impl_g
655 /// The map returned for `tcx.impl_item_implementor_ids(impl_id)` would be
656 ///`{ trait_f: impl_f, trait_g: impl_g }`
657 query impl_item_implementor_ids(impl_id: DefId) -> FxHashMap<DefId, DefId> {
658 storage(ArenaCacheSelector<'tcx>)
659 desc { |tcx| "comparing impl items against trait for {}", tcx.def_path_str(impl_id) }
662 /// Given an `impl_id`, return the trait it implements.
663 /// Return `None` if this is an inherent impl.
664 query impl_trait_ref(impl_id: DefId) -> Option<ty::TraitRef<'tcx>> {
665 desc { |tcx| "computing trait implemented by `{}`", tcx.def_path_str(impl_id) }
666 separate_provide_extern
668 query impl_polarity(impl_id: DefId) -> ty::ImplPolarity {
669 desc { |tcx| "computing implementation polarity of `{}`", tcx.def_path_str(impl_id) }
670 separate_provide_extern
673 query issue33140_self_ty(key: DefId) -> Option<ty::Ty<'tcx>> {
674 desc { |tcx| "computing Self type wrt issue #33140 `{}`", tcx.def_path_str(key) }
677 /// Maps a `DefId` of a type to a list of its inherent impls.
678 /// Contains implementations of methods that are inherent to a type.
679 /// Methods in these implementations don't need to be exported.
680 query inherent_impls(key: DefId) -> &'tcx [DefId] {
681 desc { |tcx| "collecting inherent impls for `{}`", tcx.def_path_str(key) }
682 separate_provide_extern
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" }
957 key: LitToConstInput<'tcx>
958 ) -> Result<ty::Const<'tcx>, LitToConstError> {
959 desc { "converting literal to const" }
962 query check_match(key: DefId) {
963 desc { |tcx| "match-checking `{}`", tcx.def_path_str(key) }
964 cache_on_disk_if { key.is_local() }
967 /// Performs part of the privacy check and computes "access levels".
968 query privacy_access_levels(_: ()) -> &'tcx AccessLevels {
970 desc { "privacy access levels" }
972 query check_private_in_public(_: ()) -> () {
974 desc { "checking for private elements in public interfaces" }
977 query reachable_set(_: ()) -> FxHashSet<LocalDefId> {
978 storage(ArenaCacheSelector<'tcx>)
979 desc { "reachability" }
982 /// Per-body `region::ScopeTree`. The `DefId` should be the owner `DefId` for the body;
983 /// in the case of closures, this will be redirected to the enclosing function.
984 query region_scope_tree(def_id: DefId) -> &'tcx region::ScopeTree {
985 desc { |tcx| "computing drop scopes for `{}`", tcx.def_path_str(def_id) }
988 /// Generates a MIR body for the shim.
989 query mir_shims(key: ty::InstanceDef<'tcx>) -> mir::Body<'tcx> {
990 storage(ArenaCacheSelector<'tcx>)
991 desc { |tcx| "generating MIR shim for `{}`", tcx.def_path_str(key.def_id()) }
994 /// The `symbol_name` query provides the symbol name for calling a
995 /// given instance from the local crate. In particular, it will also
996 /// look up the correct symbol name of instances from upstream crates.
997 query symbol_name(key: ty::Instance<'tcx>) -> ty::SymbolName<'tcx> {
998 desc { "computing the symbol for `{}`", key }
999 cache_on_disk_if { true }
1002 query opt_def_kind(def_id: DefId) -> Option<DefKind> {
1003 desc { |tcx| "looking up definition kind of `{}`", tcx.def_path_str(def_id) }
1004 separate_provide_extern
1007 /// Gets the span for the definition.
1008 query def_span(def_id: DefId) -> Span {
1009 desc { |tcx| "looking up span for `{}`", tcx.def_path_str(def_id) }
1010 separate_provide_extern
1013 /// Gets the span for the identifier of the definition.
1014 query def_ident_span(def_id: DefId) -> Option<Span> {
1015 desc { |tcx| "looking up span for `{}`'s identifier", tcx.def_path_str(def_id) }
1016 separate_provide_extern
1019 query lookup_stability(def_id: DefId) -> Option<attr::Stability> {
1020 desc { |tcx| "looking up stability of `{}`", tcx.def_path_str(def_id) }
1021 separate_provide_extern
1024 query lookup_const_stability(def_id: DefId) -> Option<attr::ConstStability> {
1025 desc { |tcx| "looking up const stability of `{}`", tcx.def_path_str(def_id) }
1026 separate_provide_extern
1029 query should_inherit_track_caller(def_id: DefId) -> bool {
1030 desc { |tcx| "computing should_inherit_track_caller of `{}`", tcx.def_path_str(def_id) }
1033 query lookup_deprecation_entry(def_id: DefId) -> Option<DeprecationEntry> {
1034 desc { |tcx| "checking whether `{}` is deprecated", tcx.def_path_str(def_id) }
1035 separate_provide_extern
1038 query item_attrs(def_id: DefId) -> &'tcx [ast::Attribute] {
1039 desc { |tcx| "collecting attributes of `{}`", tcx.def_path_str(def_id) }
1040 separate_provide_extern
1043 query codegen_fn_attrs(def_id: DefId) -> CodegenFnAttrs {
1044 desc { |tcx| "computing codegen attributes of `{}`", tcx.def_path_str(def_id) }
1045 storage(ArenaCacheSelector<'tcx>)
1046 cache_on_disk_if { true }
1049 query asm_target_features(def_id: DefId) -> &'tcx FxHashSet<Symbol> {
1050 desc { |tcx| "computing target features for inline asm of `{}`", tcx.def_path_str(def_id) }
1053 query fn_arg_names(def_id: DefId) -> &'tcx [rustc_span::symbol::Ident] {
1054 desc { |tcx| "looking up function parameter names for `{}`", tcx.def_path_str(def_id) }
1055 separate_provide_extern
1057 /// Gets the rendered value of the specified constant or associated constant.
1058 /// Used by rustdoc.
1059 query rendered_const(def_id: DefId) -> String {
1060 storage(ArenaCacheSelector<'tcx>)
1061 desc { |tcx| "rendering constant intializer of `{}`", tcx.def_path_str(def_id) }
1062 separate_provide_extern
1064 query impl_parent(def_id: DefId) -> Option<DefId> {
1065 desc { |tcx| "computing specialization parent impl of `{}`", tcx.def_path_str(def_id) }
1066 separate_provide_extern
1069 /// Given an `associated_item`, find the trait it belongs to.
1070 /// Return `None` if the `DefId` is not an associated item.
1071 query trait_of_item(associated_item: DefId) -> Option<DefId> {
1072 desc { |tcx| "finding trait defining `{}`", tcx.def_path_str(associated_item) }
1073 separate_provide_extern
1076 query is_ctfe_mir_available(key: DefId) -> bool {
1077 desc { |tcx| "checking if item has ctfe mir available: `{}`", tcx.def_path_str(key) }
1078 separate_provide_extern
1080 query is_mir_available(key: DefId) -> bool {
1081 desc { |tcx| "checking if item has mir available: `{}`", tcx.def_path_str(key) }
1082 separate_provide_extern
1085 query own_existential_vtable_entries(
1086 key: ty::PolyExistentialTraitRef<'tcx>
1087 ) -> &'tcx [DefId] {
1088 desc { |tcx| "finding all existential vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1091 query vtable_entries(key: ty::PolyTraitRef<'tcx>)
1092 -> &'tcx [ty::VtblEntry<'tcx>] {
1093 desc { |tcx| "finding all vtable entries for trait {}", tcx.def_path_str(key.def_id()) }
1096 query vtable_trait_upcasting_coercion_new_vptr_slot(key: (ty::Ty<'tcx>, ty::Ty<'tcx>)) -> Option<usize> {
1097 desc { |tcx| "finding the slot within vtable for trait object {} vtable ptr during trait upcasting coercion from {} vtable",
1101 query vtable_allocation(key: (Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>)) -> mir::interpret::AllocId {
1102 desc { |tcx| "vtable const allocation for <{} as {}>",
1104 key.1.map(|trait_ref| format!("{}", trait_ref)).unwrap_or("_".to_owned())
1108 query codegen_fulfill_obligation(
1109 key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
1110 ) -> Result<&'tcx ImplSource<'tcx, ()>, ErrorGuaranteed> {
1111 cache_on_disk_if { true }
1113 "checking if `{}` fulfills its obligations",
1114 tcx.def_path_str(key.1.def_id())
1118 /// Return all `impl` blocks in the current crate.
1119 query all_local_trait_impls(_: ()) -> &'tcx rustc_data_structures::fx::FxIndexMap<DefId, Vec<LocalDefId>> {
1120 desc { "local trait impls" }
1123 /// Given a trait `trait_id`, return all known `impl` blocks.
1124 query trait_impls_of(trait_id: DefId) -> ty::trait_def::TraitImpls {
1125 storage(ArenaCacheSelector<'tcx>)
1126 desc { |tcx| "trait impls of `{}`", tcx.def_path_str(trait_id) }
1129 query specialization_graph_of(trait_id: DefId) -> specialization_graph::Graph {
1130 storage(ArenaCacheSelector<'tcx>)
1131 desc { |tcx| "building specialization graph of trait `{}`", tcx.def_path_str(trait_id) }
1132 cache_on_disk_if { true }
1134 query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
1135 desc { |tcx| "determine object safety of trait `{}`", tcx.def_path_str(trait_id) }
1138 /// Gets the ParameterEnvironment for a given item; this environment
1139 /// will be in "user-facing" mode, meaning that it is suitable for
1140 /// type-checking etc, and it does not normalize specializable
1141 /// associated types. This is almost always what you want,
1142 /// unless you are doing MIR optimizations, in which case you
1143 /// might want to use `reveal_all()` method to change modes.
1144 query param_env(def_id: DefId) -> ty::ParamEnv<'tcx> {
1145 desc { |tcx| "computing normalized predicates of `{}`", tcx.def_path_str(def_id) }
1148 /// Like `param_env`, but returns the `ParamEnv` in `Reveal::All` mode.
1149 /// Prefer this over `tcx.param_env(def_id).with_reveal_all_normalized(tcx)`,
1150 /// as this method is more efficient.
1151 query param_env_reveal_all_normalized(def_id: DefId) -> ty::ParamEnv<'tcx> {
1152 desc { |tcx| "computing revealed normalized predicates of `{}`", tcx.def_path_str(def_id) }
1155 /// Trait selection queries. These are best used by invoking `ty.is_copy_modulo_regions()`,
1156 /// `ty.is_copy()`, etc, since that will prune the environment where possible.
1157 query is_copy_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1158 desc { "computing whether `{}` is `Copy`", env.value }
1161 /// Query backing `Ty::is_sized`.
1162 query is_sized_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1163 desc { "computing whether `{}` is `Sized`", env.value }
1166 /// Query backing `Ty::is_freeze`.
1167 query is_freeze_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1168 desc { "computing whether `{}` is freeze", env.value }
1171 /// Query backing `Ty::is_unpin`.
1172 query is_unpin_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1173 desc { "computing whether `{}` is `Unpin`", env.value }
1176 /// Query backing `Ty::needs_drop`.
1177 query needs_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1178 desc { "computing whether `{}` needs drop", env.value }
1181 /// Query backing `Ty::has_significant_drop_raw`.
1182 query has_significant_drop_raw(env: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1183 desc { "computing whether `{}` has a significant drop", env.value }
1187 /// Query backing `Ty::is_structural_eq_shallow`.
1189 /// This is only correct for ADTs. Call `is_structural_eq_shallow` to handle all types
1191 query has_structural_eq_impls(ty: Ty<'tcx>) -> bool {
1193 "computing whether `{:?}` implements `PartialStructuralEq` and `StructuralEq`",
1198 /// A list of types where the ADT requires drop if and only if any of
1199 /// those types require drop. If the ADT is known to always need drop
1200 /// then `Err(AlwaysRequiresDrop)` is returned.
1201 query adt_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1202 desc { |tcx| "computing when `{}` needs drop", tcx.def_path_str(def_id) }
1203 cache_on_disk_if { true }
1206 /// A list of types where the ADT requires drop if and only if any of those types
1207 /// has significant drop. A type marked with the attribute `rustc_insignificant_dtor`
1208 /// is considered to not be significant. A drop is significant if it is implemented
1209 /// by the user or does anything that will have any observable behavior (other than
1210 /// freeing up memory). If the ADT is known to have a significant destructor then
1211 /// `Err(AlwaysRequiresDrop)` is returned.
1212 query adt_significant_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
1213 desc { |tcx| "computing when `{}` has a significant destructor", tcx.def_path_str(def_id) }
1214 cache_on_disk_if { false }
1217 /// Computes the layout of a type. Note that this implicitly
1218 /// executes in "reveal all" mode, and will normalize the input type.
1220 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1221 ) -> Result<ty::layout::TyAndLayout<'tcx>, ty::layout::LayoutError<'tcx>> {
1222 desc { "computing layout of `{}`", key.value }
1226 /// Compute a `FnAbi` suitable for indirect calls, i.e. to `fn` pointers.
1228 /// NB: this doesn't handle virtual calls - those should use `fn_abi_of_instance`
1229 /// instead, where the instance is an `InstanceDef::Virtual`.
1230 query fn_abi_of_fn_ptr(
1231 key: ty::ParamEnvAnd<'tcx, (ty::PolyFnSig<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1232 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1233 desc { "computing call ABI of `{}` function pointers", key.value.0 }
1237 /// Compute a `FnAbi` suitable for declaring/defining an `fn` instance, and for
1238 /// direct calls to an `fn`.
1240 /// NB: that includes virtual calls, which are represented by "direct calls"
1241 /// to an `InstanceDef::Virtual` instance (of `<dyn Trait as Trait>::fn`).
1242 query fn_abi_of_instance(
1243 key: ty::ParamEnvAnd<'tcx, (ty::Instance<'tcx>, &'tcx ty::List<Ty<'tcx>>)>
1244 ) -> Result<&'tcx abi::call::FnAbi<'tcx, Ty<'tcx>>, ty::layout::FnAbiError<'tcx>> {
1245 desc { "computing call ABI of `{}`", key.value.0 }
1249 query dylib_dependency_formats(_: CrateNum)
1250 -> &'tcx [(CrateNum, LinkagePreference)] {
1251 desc { "dylib dependency formats of crate" }
1252 separate_provide_extern
1255 query dependency_formats(_: ()) -> Lrc<crate::middle::dependency_format::Dependencies> {
1256 storage(ArenaCacheSelector<'tcx>)
1257 desc { "get the linkage format of all dependencies" }
1260 query is_compiler_builtins(_: CrateNum) -> bool {
1262 desc { "checking if the crate is_compiler_builtins" }
1263 separate_provide_extern
1265 query has_global_allocator(_: CrateNum) -> bool {
1266 // This query depends on untracked global state in CStore
1269 desc { "checking if the crate has_global_allocator" }
1270 separate_provide_extern
1272 query has_panic_handler(_: CrateNum) -> bool {
1274 desc { "checking if the crate has_panic_handler" }
1275 separate_provide_extern
1277 query is_profiler_runtime(_: CrateNum) -> bool {
1279 desc { "query a crate is `#![profiler_runtime]`" }
1280 separate_provide_extern
1282 query panic_strategy(_: CrateNum) -> PanicStrategy {
1284 desc { "query a crate's configured panic strategy" }
1285 separate_provide_extern
1287 query panic_in_drop_strategy(_: CrateNum) -> PanicStrategy {
1289 desc { "query a crate's configured panic-in-drop strategy" }
1290 separate_provide_extern
1292 query is_no_builtins(_: CrateNum) -> bool {
1294 desc { "test whether a crate has `#![no_builtins]`" }
1295 separate_provide_extern
1297 query symbol_mangling_version(_: CrateNum) -> SymbolManglingVersion {
1299 desc { "query a crate's symbol mangling version" }
1300 separate_provide_extern
1303 query extern_crate(def_id: DefId) -> Option<&'tcx ExternCrate> {
1305 desc { "getting crate's ExternCrateData" }
1306 separate_provide_extern
1309 query specializes(_: (DefId, DefId)) -> bool {
1310 desc { "computing whether impls specialize one another" }
1312 query in_scope_traits_map(_: LocalDefId)
1313 -> Option<&'tcx FxHashMap<ItemLocalId, Box<[TraitCandidate]>>> {
1314 desc { "traits in scope at a block" }
1317 query module_reexports(def_id: LocalDefId) -> Option<&'tcx [ModChild]> {
1318 desc { |tcx| "looking up reexports of module `{}`", tcx.def_path_str(def_id.to_def_id()) }
1321 query impl_defaultness(def_id: DefId) -> hir::Defaultness {
1322 desc { |tcx| "looking up whether `{}` is a default impl", tcx.def_path_str(def_id) }
1323 separate_provide_extern
1326 query impl_constness(def_id: DefId) -> hir::Constness {
1327 desc { |tcx| "looking up whether `{}` is a const impl", tcx.def_path_str(def_id) }
1328 separate_provide_extern
1331 query check_item_well_formed(key: LocalDefId) -> () {
1332 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1334 query check_trait_item_well_formed(key: LocalDefId) -> () {
1335 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1337 query check_impl_item_well_formed(key: LocalDefId) -> () {
1338 desc { |tcx| "checking that `{}` is well-formed", tcx.def_path_str(key.to_def_id()) }
1341 // The `DefId`s of all non-generic functions and statics in the given crate
1342 // that can be reached from outside the crate.
1344 // We expect this items to be available for being linked to.
1346 // This query can also be called for `LOCAL_CRATE`. In this case it will
1347 // compute which items will be reachable to other crates, taking into account
1348 // the kind of crate that is currently compiled. Crates with only a
1349 // C interface have fewer reachable things.
1351 // Does not include external symbols that don't have a corresponding DefId,
1352 // like the compiler-generated `main` function and so on.
1353 query reachable_non_generics(_: CrateNum)
1354 -> DefIdMap<SymbolExportLevel> {
1355 storage(ArenaCacheSelector<'tcx>)
1356 desc { "looking up the exported symbols of a crate" }
1357 separate_provide_extern
1359 query is_reachable_non_generic(def_id: DefId) -> bool {
1360 desc { |tcx| "checking whether `{}` is an exported symbol", tcx.def_path_str(def_id) }
1361 separate_provide_extern
1363 query is_unreachable_local_definition(def_id: LocalDefId) -> bool {
1365 "checking whether `{}` is reachable from outside the crate",
1366 tcx.def_path_str(def_id.to_def_id()),
1370 /// The entire set of monomorphizations the local crate can safely link
1371 /// to because they are exported from upstream crates. Do not depend on
1372 /// this directly, as its value changes anytime a monomorphization gets
1373 /// added or removed in any upstream crate. Instead use the narrower
1374 /// `upstream_monomorphizations_for`, `upstream_drop_glue_for`, or, even
1375 /// better, `Instance::upstream_monomorphization()`.
1376 query upstream_monomorphizations(_: ()) -> DefIdMap<FxHashMap<SubstsRef<'tcx>, CrateNum>> {
1377 storage(ArenaCacheSelector<'tcx>)
1378 desc { "collecting available upstream monomorphizations" }
1381 /// Returns the set of upstream monomorphizations available for the
1382 /// generic function identified by the given `def_id`. The query makes
1383 /// sure to make a stable selection if the same monomorphization is
1384 /// available in multiple upstream crates.
1386 /// You likely want to call `Instance::upstream_monomorphization()`
1387 /// instead of invoking this query directly.
1388 query upstream_monomorphizations_for(def_id: DefId)
1389 -> Option<&'tcx FxHashMap<SubstsRef<'tcx>, CrateNum>>
1391 storage(ArenaCacheSelector<'tcx>)
1393 "collecting available upstream monomorphizations for `{}`",
1394 tcx.def_path_str(def_id),
1396 separate_provide_extern
1399 /// Returns the upstream crate that exports drop-glue for the given
1400 /// type (`substs` is expected to be a single-item list containing the
1401 /// type one wants drop-glue for).
1403 /// This is a subset of `upstream_monomorphizations_for` in order to
1404 /// increase dep-tracking granularity. Otherwise adding or removing any
1405 /// type with drop-glue in any upstream crate would invalidate all
1406 /// functions calling drop-glue of an upstream type.
1408 /// You likely want to call `Instance::upstream_monomorphization()`
1409 /// instead of invoking this query directly.
1411 /// NOTE: This query could easily be extended to also support other
1412 /// common functions that have are large set of monomorphizations
1413 /// (like `Clone::clone` for example).
1414 query upstream_drop_glue_for(substs: SubstsRef<'tcx>) -> Option<CrateNum> {
1415 desc { "available upstream drop-glue for `{:?}`", substs }
1418 query foreign_modules(_: CrateNum) -> FxHashMap<DefId, ForeignModule> {
1419 storage(ArenaCacheSelector<'tcx>)
1420 desc { "looking up the foreign modules of a linked crate" }
1421 separate_provide_extern
1424 /// Identifies the entry-point (e.g., the `main` function) for a given
1425 /// crate, returning `None` if there is no entry point (such as for library crates).
1426 query entry_fn(_: ()) -> Option<(DefId, EntryFnType)> {
1427 desc { "looking up the entry function of a crate" }
1429 query proc_macro_decls_static(_: ()) -> Option<LocalDefId> {
1430 desc { "looking up the derive registrar for a crate" }
1432 // The macro which defines `rustc_metadata::provide_extern` depends on this query's name.
1433 // Changing the name should cause a compiler error, but in case that changes, be aware.
1434 query crate_hash(_: CrateNum) -> Svh {
1436 desc { "looking up the hash a crate" }
1437 separate_provide_extern
1439 query crate_host_hash(_: CrateNum) -> Option<Svh> {
1441 desc { "looking up the hash of a host version of a crate" }
1442 separate_provide_extern
1444 query extra_filename(_: CrateNum) -> String {
1445 storage(ArenaCacheSelector<'tcx>)
1447 desc { "looking up the extra filename for a crate" }
1448 separate_provide_extern
1450 query crate_extern_paths(_: CrateNum) -> Vec<PathBuf> {
1451 storage(ArenaCacheSelector<'tcx>)
1453 desc { "looking up the paths for extern crates" }
1454 separate_provide_extern
1457 /// Given a crate and a trait, look up all impls of that trait in the crate.
1458 /// Return `(impl_id, self_ty)`.
1459 query implementations_of_trait(_: (CrateNum, DefId)) -> &'tcx [(DefId, Option<SimplifiedType>)] {
1460 desc { "looking up implementations of a trait in a crate" }
1461 separate_provide_extern
1464 query is_dllimport_foreign_item(def_id: DefId) -> bool {
1465 desc { |tcx| "is_dllimport_foreign_item({})", tcx.def_path_str(def_id) }
1467 query is_statically_included_foreign_item(def_id: DefId) -> bool {
1468 desc { |tcx| "is_statically_included_foreign_item({})", tcx.def_path_str(def_id) }
1470 query native_library_kind(def_id: DefId)
1471 -> Option<NativeLibKind> {
1472 desc { |tcx| "native_library_kind({})", tcx.def_path_str(def_id) }
1475 /// Does lifetime resolution, but does not descend into trait items. This
1476 /// should only be used for resolving lifetimes of on trait definitions,
1477 /// and is used to avoid cycles. Importantly, `resolve_lifetimes` still visits
1478 /// the same lifetimes and is responsible for diagnostics.
1479 /// See `rustc_resolve::late::lifetimes for details.
1480 query resolve_lifetimes_trait_definition(_: LocalDefId) -> ResolveLifetimes {
1481 storage(ArenaCacheSelector<'tcx>)
1482 desc { "resolving lifetimes for a trait definition" }
1484 /// Does lifetime resolution on items. Importantly, we can't resolve
1485 /// lifetimes directly on things like trait methods, because of trait params.
1486 /// See `rustc_resolve::late::lifetimes for details.
1487 query resolve_lifetimes(_: LocalDefId) -> ResolveLifetimes {
1488 storage(ArenaCacheSelector<'tcx>)
1489 desc { "resolving lifetimes" }
1491 query named_region_map(_: LocalDefId) ->
1492 Option<&'tcx FxHashMap<ItemLocalId, Region>> {
1493 desc { "looking up a named region" }
1495 query is_late_bound_map(_: LocalDefId) ->
1496 Option<(LocalDefId, &'tcx FxHashSet<ItemLocalId>)> {
1497 desc { "testing if a region is late bound" }
1499 /// For a given item (like a struct), gets the default lifetimes to be used
1500 /// for each parameter if a trait object were to be passed for that parameter.
1501 /// For example, for `struct Foo<'a, T, U>`, this would be `['static, 'static]`.
1502 /// For `struct Foo<'a, T: 'a, U>`, this would instead be `['a, 'static]`.
1503 query object_lifetime_defaults(_: LocalDefId) -> Option<&'tcx [ObjectLifetimeDefault]> {
1504 desc { "looking up lifetime defaults for a region on an item" }
1506 query late_bound_vars_map(_: LocalDefId)
1507 -> Option<&'tcx FxHashMap<ItemLocalId, Vec<ty::BoundVariableKind>>> {
1508 desc { "looking up late bound vars" }
1511 query lifetime_scope_map(_: LocalDefId) -> Option<FxHashMap<ItemLocalId, LifetimeScopeForPath>> {
1512 storage(ArenaCacheSelector<'tcx>)
1513 desc { "finds the lifetime scope for an HirId of a PathSegment" }
1516 query visibility(def_id: DefId) -> ty::Visibility {
1517 desc { |tcx| "computing visibility of `{}`", tcx.def_path_str(def_id) }
1518 separate_provide_extern
1521 /// Computes the set of modules from which this type is visibly uninhabited.
1522 /// To check whether a type is uninhabited at all (not just from a given module), you could
1523 /// check whether the forest is empty.
1524 query type_uninhabited_from(
1525 key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>
1526 ) -> ty::inhabitedness::DefIdForest<'tcx> {
1527 desc { "computing the inhabitedness of `{:?}`", key }
1531 query dep_kind(_: CrateNum) -> CrateDepKind {
1533 desc { "fetching what a dependency looks like" }
1534 separate_provide_extern
1537 /// Gets the name of the crate.
1538 query crate_name(_: CrateNum) -> Symbol {
1540 desc { "fetching what a crate is named" }
1541 separate_provide_extern
1543 query module_children(def_id: DefId) -> &'tcx [ModChild] {
1544 desc { |tcx| "collecting child items of module `{}`", tcx.def_path_str(def_id) }
1545 separate_provide_extern
1547 query extern_mod_stmt_cnum(def_id: LocalDefId) -> Option<CrateNum> {
1548 desc { |tcx| "computing crate imported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
1551 query lib_features(_: ()) -> LibFeatures {
1552 storage(ArenaCacheSelector<'tcx>)
1553 desc { "calculating the lib features map" }
1555 query defined_lib_features(_: CrateNum)
1556 -> &'tcx [(Symbol, Option<Symbol>)] {
1557 desc { "calculating the lib features defined in a crate" }
1558 separate_provide_extern
1560 /// Returns the lang items defined in another crate by loading it from metadata.
1561 query get_lang_items(_: ()) -> LanguageItems {
1562 storage(ArenaCacheSelector<'tcx>)
1564 desc { "calculating the lang items map" }
1567 /// Returns all diagnostic items defined in all crates.
1568 query all_diagnostic_items(_: ()) -> rustc_hir::diagnostic_items::DiagnosticItems {
1569 storage(ArenaCacheSelector<'tcx>)
1571 desc { "calculating the diagnostic items map" }
1574 /// Returns the lang items defined in another crate by loading it from metadata.
1575 query defined_lang_items(_: CrateNum) -> &'tcx [(DefId, usize)] {
1576 desc { "calculating the lang items defined in a crate" }
1577 separate_provide_extern
1580 /// Returns the diagnostic items defined in a crate.
1581 query diagnostic_items(_: CrateNum) -> rustc_hir::diagnostic_items::DiagnosticItems {
1582 storage(ArenaCacheSelector<'tcx>)
1583 desc { "calculating the diagnostic items map in a crate" }
1584 separate_provide_extern
1587 query missing_lang_items(_: CrateNum) -> &'tcx [LangItem] {
1588 desc { "calculating the missing lang items in a crate" }
1589 separate_provide_extern
1591 query visible_parent_map(_: ()) -> DefIdMap<DefId> {
1592 storage(ArenaCacheSelector<'tcx>)
1593 desc { "calculating the visible parent map" }
1595 query trimmed_def_paths(_: ()) -> FxHashMap<DefId, Symbol> {
1596 storage(ArenaCacheSelector<'tcx>)
1597 desc { "calculating trimmed def paths" }
1599 query missing_extern_crate_item(_: CrateNum) -> bool {
1601 desc { "seeing if we're missing an `extern crate` item for this crate" }
1602 separate_provide_extern
1604 query used_crate_source(_: CrateNum) -> Lrc<CrateSource> {
1605 storage(ArenaCacheSelector<'tcx>)
1607 desc { "looking at the source for a crate" }
1608 separate_provide_extern
1610 query postorder_cnums(_: ()) -> &'tcx [CrateNum] {
1612 desc { "generating a postorder list of CrateNums" }
1614 /// Returns whether or not the crate with CrateNum 'cnum'
1615 /// is marked as a private dependency
1616 query is_private_dep(c: CrateNum) -> bool {
1618 desc { "check whether crate {} is a private dependency", c }
1619 separate_provide_extern
1621 query allocator_kind(_: ()) -> Option<AllocatorKind> {
1623 desc { "allocator kind for the current crate" }
1626 query upvars_mentioned(def_id: DefId) -> Option<&'tcx FxIndexMap<hir::HirId, hir::Upvar>> {
1627 desc { |tcx| "collecting upvars mentioned in `{}`", tcx.def_path_str(def_id) }
1629 query maybe_unused_trait_import(def_id: LocalDefId) -> bool {
1630 desc { |tcx| "maybe_unused_trait_import for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1632 query maybe_unused_extern_crates(_: ()) -> &'tcx [(LocalDefId, Span)] {
1633 desc { "looking up all possibly unused extern crates" }
1635 query names_imported_by_glob_use(def_id: LocalDefId) -> &'tcx FxHashSet<Symbol> {
1636 desc { |tcx| "names_imported_by_glob_use for `{}`", tcx.def_path_str(def_id.to_def_id()) }
1639 query stability_index(_: ()) -> stability::Index {
1640 storage(ArenaCacheSelector<'tcx>)
1642 desc { "calculating the stability index for the local crate" }
1644 query crates(_: ()) -> &'tcx [CrateNum] {
1646 desc { "fetching all foreign CrateNum instances" }
1649 /// A list of all traits in a crate, used by rustdoc and error reporting.
1650 /// NOTE: Not named just `traits` due to a naming conflict.
1651 query traits_in_crate(_: CrateNum) -> &'tcx [DefId] {
1652 desc { "fetching all traits in a crate" }
1653 separate_provide_extern
1656 /// The list of symbols exported from the given crate.
1658 /// - All names contained in `exported_symbols(cnum)` are guaranteed to
1659 /// correspond to a publicly visible symbol in `cnum` machine code.
1660 /// - The `exported_symbols` sets of different crates do not intersect.
1661 query exported_symbols(_: CrateNum)
1662 -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1663 desc { "exported_symbols" }
1664 separate_provide_extern
1667 query collect_and_partition_mono_items(_: ()) -> (&'tcx DefIdSet, &'tcx [CodegenUnit<'tcx>]) {
1669 desc { "collect_and_partition_mono_items" }
1671 query is_codegened_item(def_id: DefId) -> bool {
1672 desc { |tcx| "determining whether `{}` needs codegen", tcx.def_path_str(def_id) }
1675 /// All items participating in code generation together with items inlined into them.
1676 query codegened_and_inlined_items(_: ()) -> &'tcx DefIdSet {
1678 desc { "codegened_and_inlined_items" }
1681 query codegen_unit(_: Symbol) -> &'tcx CodegenUnit<'tcx> {
1682 desc { "codegen_unit" }
1684 query unused_generic_params(key: ty::InstanceDef<'tcx>) -> FiniteBitSet<u32> {
1685 cache_on_disk_if { key.def_id().is_local() }
1687 |tcx| "determining which generic parameters are unused by `{}`",
1688 tcx.def_path_str(key.def_id())
1690 separate_provide_extern
1692 query backend_optimization_level(_: ()) -> OptLevel {
1693 desc { "optimization level used by backend" }
1696 /// Return the filenames where output artefacts shall be stored.
1698 /// This query returns an `&Arc` because codegen backends need the value even after the `TyCtxt`
1699 /// has been destroyed.
1700 query output_filenames(_: ()) -> &'tcx Arc<OutputFilenames> {
1702 desc { "output_filenames" }
1705 /// Do not call this query directly: invoke `normalize` instead.
1706 query normalize_projection_ty(
1707 goal: CanonicalProjectionGoal<'tcx>
1709 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, NormalizationResult<'tcx>>>,
1712 desc { "normalizing `{:?}`", goal }
1716 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1717 query try_normalize_generic_arg_after_erasing_regions(
1718 goal: ParamEnvAnd<'tcx, GenericArg<'tcx>>
1719 ) -> Result<GenericArg<'tcx>, NoSolution> {
1720 desc { "normalizing `{}`", goal.value }
1724 /// Do not call this query directly: invoke `try_normalize_erasing_regions` instead.
1725 query try_normalize_mir_const_after_erasing_regions(
1726 goal: ParamEnvAnd<'tcx, mir::ConstantKind<'tcx>>
1727 ) -> Result<mir::ConstantKind<'tcx>, NoSolution> {
1728 desc { "normalizing `{}`", goal.value }
1732 query implied_outlives_bounds(
1733 goal: CanonicalTyGoal<'tcx>
1735 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Vec<OutlivesBound<'tcx>>>>,
1738 desc { "computing implied outlives bounds for `{:?}`", goal }
1742 /// Do not call this query directly: invoke `infcx.at().dropck_outlives()` instead.
1743 query dropck_outlives(
1744 goal: CanonicalTyGoal<'tcx>
1746 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, DropckOutlivesResult<'tcx>>>,
1749 desc { "computing dropck types for `{:?}`", goal }
1753 /// Do not call this query directly: invoke `infcx.predicate_may_hold()` or
1754 /// `infcx.predicate_must_hold()` instead.
1755 query evaluate_obligation(
1756 goal: CanonicalPredicateGoal<'tcx>
1757 ) -> Result<traits::EvaluationResult, traits::OverflowError> {
1758 desc { "evaluating trait selection obligation `{}`", goal.value.value }
1761 query evaluate_goal(
1762 goal: traits::CanonicalChalkEnvironmentAndGoal<'tcx>
1764 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1767 desc { "evaluating trait selection obligation `{}`", goal.value }
1770 /// Do not call this query directly: part of the `Eq` type-op
1771 query type_op_ascribe_user_type(
1772 goal: CanonicalTypeOpAscribeUserTypeGoal<'tcx>
1774 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1777 desc { "evaluating `type_op_ascribe_user_type` `{:?}`", goal }
1781 /// Do not call this query directly: part of the `Eq` type-op
1783 goal: CanonicalTypeOpEqGoal<'tcx>
1785 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1788 desc { "evaluating `type_op_eq` `{:?}`", goal }
1792 /// Do not call this query directly: part of the `Subtype` type-op
1793 query type_op_subtype(
1794 goal: CanonicalTypeOpSubtypeGoal<'tcx>
1796 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1799 desc { "evaluating `type_op_subtype` `{:?}`", goal }
1803 /// Do not call this query directly: part of the `ProvePredicate` type-op
1804 query type_op_prove_predicate(
1805 goal: CanonicalTypeOpProvePredicateGoal<'tcx>
1807 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
1810 desc { "evaluating `type_op_prove_predicate` `{:?}`", goal }
1813 /// Do not call this query directly: part of the `Normalize` type-op
1814 query type_op_normalize_ty(
1815 goal: CanonicalTypeOpNormalizeGoal<'tcx, Ty<'tcx>>
1817 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, Ty<'tcx>>>,
1820 desc { "normalizing `{:?}`", goal }
1824 /// Do not call this query directly: part of the `Normalize` type-op
1825 query type_op_normalize_predicate(
1826 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::Predicate<'tcx>>
1828 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::Predicate<'tcx>>>,
1831 desc { "normalizing `{:?}`", goal }
1835 /// Do not call this query directly: part of the `Normalize` type-op
1836 query type_op_normalize_poly_fn_sig(
1837 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::PolyFnSig<'tcx>>
1839 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::PolyFnSig<'tcx>>>,
1842 desc { "normalizing `{:?}`", goal }
1846 /// Do not call this query directly: part of the `Normalize` type-op
1847 query type_op_normalize_fn_sig(
1848 goal: CanonicalTypeOpNormalizeGoal<'tcx, ty::FnSig<'tcx>>
1850 &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ty::FnSig<'tcx>>>,
1853 desc { "normalizing `{:?}`", goal }
1857 query subst_and_check_impossible_predicates(key: (DefId, SubstsRef<'tcx>)) -> bool {
1859 "impossible substituted predicates:`{}`",
1860 tcx.def_path_str(key.0)
1864 query method_autoderef_steps(
1865 goal: CanonicalTyGoal<'tcx>
1866 ) -> MethodAutoderefStepsResult<'tcx> {
1867 desc { "computing autoderef types for `{:?}`", goal }
1871 query supported_target_features(_: CrateNum) -> FxHashMap<String, Option<Symbol>> {
1872 storage(ArenaCacheSelector<'tcx>)
1874 desc { "looking up supported target features" }
1877 /// Get an estimate of the size of an InstanceDef based on its MIR for CGU partitioning.
1878 query instance_def_size_estimate(def: ty::InstanceDef<'tcx>)
1880 desc { |tcx| "estimating size for `{}`", tcx.def_path_str(def.def_id()) }
1883 query features_query(_: ()) -> &'tcx rustc_feature::Features {
1885 desc { "looking up enabled feature gates" }
1888 /// Attempt to resolve the given `DefId` to an `Instance`, for the
1889 /// given generics args (`SubstsRef`), returning one of:
1890 /// * `Ok(Some(instance))` on success
1891 /// * `Ok(None)` when the `SubstsRef` are still too generic,
1892 /// and therefore don't allow finding the final `Instance`
1893 /// * `Err(ErrorGuaranteed)` when the `Instance` resolution process
1894 /// couldn't complete due to errors elsewhere - this is distinct
1895 /// from `Ok(None)` to avoid misleading diagnostics when an error
1896 /// has already been/will be emitted, for the original cause
1897 query resolve_instance(
1898 key: ty::ParamEnvAnd<'tcx, (DefId, SubstsRef<'tcx>)>
1899 ) -> Result<Option<ty::Instance<'tcx>>, ErrorGuaranteed> {
1900 desc { "resolving instance `{}`", ty::Instance::new(key.value.0, key.value.1) }
1904 query resolve_instance_of_const_arg(
1905 key: ty::ParamEnvAnd<'tcx, (LocalDefId, DefId, SubstsRef<'tcx>)>
1906 ) -> Result<Option<ty::Instance<'tcx>>, ErrorGuaranteed> {
1908 "resolving instance of the const argument `{}`",
1909 ty::Instance::new(key.value.0.to_def_id(), key.value.2),
1914 query normalize_opaque_types(key: &'tcx ty::List<ty::Predicate<'tcx>>) -> &'tcx ty::List<ty::Predicate<'tcx>> {
1915 desc { "normalizing opaque types in {:?}", key }
1918 /// Checks whether a type is definitely uninhabited. This is
1919 /// conservative: for some types that are uninhabited we return `false`,
1920 /// but we only return `true` for types that are definitely uninhabited.
1921 /// `ty.conservative_is_privately_uninhabited` implies that any value of type `ty`
1922 /// will be `Abi::Uninhabited`. (Note that uninhabited types may have nonzero
1923 /// size, to account for partial initialisation. See #49298 for details.)
1924 query conservative_is_privately_uninhabited(key: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
1925 desc { "conservatively checking if {:?} is privately uninhabited", key }
1929 query limits(key: ()) -> Limits {
1930 desc { "looking up limits" }
1933 /// Performs an HIR-based well-formed check on the item with the given `HirId`. If
1934 /// we get an `Unimplemented` error that matches the provided `Predicate`, return
1935 /// the cause of the newly created obligation.
1937 /// This is only used by error-reporting code to get a better cause (in particular, a better
1938 /// span) for an *existing* error. Therefore, it is best-effort, and may never handle
1939 /// all of the cases that the normal `ty::Ty`-based wfcheck does. This is fine,
1940 /// because the `ty::Ty`-based wfcheck is always run.
1941 query diagnostic_hir_wf_check(key: (ty::Predicate<'tcx>, traits::WellFormedLoc)) -> Option<traits::ObligationCause<'tcx>> {
1942 storage(ArenaCacheSelector<'tcx>)
1945 desc { "performing HIR wf-checking for predicate {:?} at item {:?}", key.0, key.1 }
1949 /// The list of backend features computed from CLI flags (`-Ctarget-cpu`, `-Ctarget-feature`,
1950 /// `--target` and similar).
1951 query global_backend_features(_: ()) -> Vec<String> {
1952 storage(ArenaCacheSelector<'tcx>)
1954 desc { "computing the backend features for CLI flags" }