1 //! The implementation of `RustIrDatabase` for Chalk, which provides information
2 //! about the code that Chalk needs.
9 use chalk_ir::{cast::Cast, fold::shift::Shift, CanonicalVarKinds};
10 use chalk_solve::rust_ir::{self, OpaqueTyDatumBound, WellKnownTrait};
14 lang_item::{lang_attr, LangItemTarget},
15 AssocItemId, GenericDefId, HasModule, ItemContainerId, Lookup, ModuleId, TypeAliasId,
17 use hir_expand::name::name;
22 from_assoc_type_id, from_chalk_trait_id, from_foreign_def_id, make_binders,
23 make_single_type_binders,
24 mapping::{from_chalk, ToChalk, TypeAliasAsValue},
25 method_resolution::{TraitImpls, TyFingerprint, ALL_FLOAT_FPS, ALL_INT_FPS},
26 to_assoc_type_id, to_chalk_trait_id,
29 AliasEq, AliasTy, BoundVar, CallableDefId, DebruijnIndex, FnDefId, Interner, ProjectionTy,
30 ProjectionTyExt, QuantifiedWhereClause, Substitution, TraitRef, TraitRefExt, Ty, TyBuilder,
31 TyExt, TyKind, WhereClause,
34 pub(crate) type AssociatedTyDatum = chalk_solve::rust_ir::AssociatedTyDatum<Interner>;
35 pub(crate) type TraitDatum = chalk_solve::rust_ir::TraitDatum<Interner>;
36 pub(crate) type StructDatum = chalk_solve::rust_ir::AdtDatum<Interner>;
37 pub(crate) type ImplDatum = chalk_solve::rust_ir::ImplDatum<Interner>;
38 pub(crate) type OpaqueTyDatum = chalk_solve::rust_ir::OpaqueTyDatum<Interner>;
40 pub(crate) type AssocTypeId = chalk_ir::AssocTypeId<Interner>;
41 pub(crate) type TraitId = chalk_ir::TraitId<Interner>;
42 pub(crate) type AdtId = chalk_ir::AdtId<Interner>;
43 pub(crate) type ImplId = chalk_ir::ImplId<Interner>;
44 pub(crate) type AssociatedTyValueId = chalk_solve::rust_ir::AssociatedTyValueId<Interner>;
45 pub(crate) type AssociatedTyValue = chalk_solve::rust_ir::AssociatedTyValue<Interner>;
46 pub(crate) type FnDefDatum = chalk_solve::rust_ir::FnDefDatum<Interner>;
47 pub(crate) type Variances = chalk_ir::Variances<Interner>;
49 impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
50 fn associated_ty_data(&self, id: AssocTypeId) -> Arc<AssociatedTyDatum> {
51 self.db.associated_ty_data(id)
53 fn trait_datum(&self, trait_id: TraitId) -> Arc<TraitDatum> {
54 self.db.trait_datum(self.krate, trait_id)
56 fn adt_datum(&self, struct_id: AdtId) -> Arc<StructDatum> {
57 self.db.struct_datum(self.krate, struct_id)
59 fn adt_repr(&self, _struct_id: AdtId) -> Arc<rust_ir::AdtRepr<Interner>> {
60 // FIXME: keep track of these
61 Arc::new(rust_ir::AdtRepr { c: false, packed: false, int: None })
63 fn discriminant_type(&self, _ty: chalk_ir::Ty<Interner>) -> chalk_ir::Ty<Interner> {
64 // FIXME: keep track of this
65 chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Uint(chalk_ir::UintTy::U32)).intern(Interner)
67 fn impl_datum(&self, impl_id: ImplId) -> Arc<ImplDatum> {
68 self.db.impl_datum(self.krate, impl_id)
73 fn_def_id: chalk_ir::FnDefId<Interner>,
74 ) -> Arc<rust_ir::FnDefDatum<Interner>> {
75 self.db.fn_def_datum(self.krate, fn_def_id)
81 parameters: &[chalk_ir::GenericArg<Interner>],
82 binders: &CanonicalVarKinds<Interner>,
84 debug!("impls_for_trait {:?}", trait_id);
85 let trait_: hir_def::TraitId = from_chalk_trait_id(trait_id);
87 let ty: Ty = parameters[0].assert_ty_ref(Interner).clone();
91 binders: &CanonicalVarKinds<Interner>,
92 ) -> Option<chalk_ir::TyVariableKind> {
93 if let TyKind::BoundVar(bv) = ty.kind(Interner) {
94 let binders = binders.as_slice(Interner);
95 if bv.debruijn == DebruijnIndex::INNERMOST {
96 if let chalk_ir::VariableKind::Ty(tk) = binders[bv.index].kind {
104 let self_ty_fp = TyFingerprint::for_trait_impl(&ty);
105 let fps: &[TyFingerprint] = match binder_kind(&ty, binders) {
106 Some(chalk_ir::TyVariableKind::Integer) => &ALL_INT_FPS,
107 Some(chalk_ir::TyVariableKind::Float) => &ALL_FLOAT_FPS,
108 _ => self_ty_fp.as_ref().map(std::slice::from_ref).unwrap_or(&[]),
111 fn local_impls(db: &dyn HirDatabase, module: ModuleId) -> Option<Arc<TraitImpls>> {
112 let block = module.containing_block()?;
113 hit!(block_local_impls);
114 db.trait_impls_in_block(block)
117 // Note: Since we're using impls_for_trait, only impls where the trait
118 // can be resolved should ever reach Chalk. impl_datum relies on that
119 // and will panic if the trait can't be resolved.
120 let in_deps = self.db.trait_impls_in_deps(self.krate);
121 let in_self = self.db.trait_impls_in_crate(self.krate);
122 let trait_module = trait_.module(self.db.upcast());
123 let type_module = match self_ty_fp {
124 Some(TyFingerprint::Adt(adt_id)) => Some(adt_id.module(self.db.upcast())),
125 Some(TyFingerprint::ForeignType(type_id)) => {
126 Some(from_foreign_def_id(type_id).module(self.db.upcast()))
128 Some(TyFingerprint::Dyn(trait_id)) => Some(trait_id.module(self.db.upcast())),
134 local_impls(self.db, trait_module),
135 type_module.and_then(|m| local_impls(self.db, m)),
138 let id_to_chalk = |id: hir_def::ImplId| id.to_chalk(self.db);
140 let result: Vec<_> = if fps.is_empty() {
141 debug!("Unrestricted search for {:?} impls...", trait_);
144 .filter_map(|o| o.as_ref())
145 .flat_map(|impls| impls.for_trait(trait_).map(id_to_chalk))
150 .filter_map(|o| o.as_ref())
152 fps.iter().flat_map(move |fp| {
153 impls.for_trait_and_self_ty(trait_, *fp).map(id_to_chalk)
159 debug!("impls_for_trait returned {} impls", result.len());
162 fn impl_provided_for(&self, auto_trait_id: TraitId, kind: &chalk_ir::TyKind<Interner>) -> bool {
163 debug!("impl_provided_for {:?}, {:?}", auto_trait_id, kind);
166 fn associated_ty_value(&self, id: AssociatedTyValueId) -> Arc<AssociatedTyValue> {
167 self.db.associated_ty_value(self.krate, id)
170 fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<Interner>> {
173 fn local_impls_to_coherence_check(&self, _trait_id: TraitId) -> Vec<ImplId> {
174 // We don't do coherence checking (yet)
177 fn interner(&self) -> Interner {
180 fn well_known_trait_id(
182 well_known_trait: rust_ir::WellKnownTrait,
183 ) -> Option<chalk_ir::TraitId<Interner>> {
184 let lang_attr = lang_attr_from_well_known_trait(well_known_trait);
185 let trait_ = match self.db.lang_item(self.krate, lang_attr.into()) {
186 Some(LangItemTarget::TraitId(trait_)) => trait_,
189 Some(to_chalk_trait_id(trait_))
192 fn program_clauses_for_env(
194 environment: &chalk_ir::Environment<Interner>,
195 ) -> chalk_ir::ProgramClauses<Interner> {
196 self.db.program_clauses_for_chalk_env(self.krate, environment.clone())
199 fn opaque_ty_data(&self, id: chalk_ir::OpaqueTyId<Interner>) -> Arc<OpaqueTyDatum> {
200 let full_id = self.db.lookup_intern_impl_trait_id(id.into());
201 let bound = match full_id {
202 crate::ImplTraitId::ReturnTypeImplTrait(func, idx) => {
205 .return_type_impl_traits(func)
206 .expect("impl trait id without impl traits");
207 let (datas, binders) = (*datas).as_ref().into_value_and_skipped_binders();
208 let data = &datas.impl_traits[idx as usize];
209 let bound = OpaqueTyDatumBound {
210 bounds: make_single_type_binders(data.bounds.skip_binders().to_vec()),
211 where_clauses: chalk_ir::Binders::empty(Interner, vec![]),
213 chalk_ir::Binders::new(binders, bound)
215 crate::ImplTraitId::AsyncBlockTypeImplTrait(..) => {
216 if let Some((future_trait, future_output)) = self
218 .lang_item(self.krate, SmolStr::new_inline("future_trait"))
219 .and_then(|item| item.as_trait())
222 self.db.trait_data(trait_).associated_type_by_name(&name![Output])?;
223 Some((trait_, alias))
226 // Making up Symbol’s value as variable is void: AsyncBlock<T>:
228 // |--------------------OpaqueTyDatum-------------------|
229 // |-------------OpaqueTyDatumBound--------------|
230 // for<T> <Self> [Future<Self>, Future::Output<Self> = T]
232 let impl_bound = WhereClause::Implemented(TraitRef {
233 trait_id: to_chalk_trait_id(future_trait),
234 // Self type as the first parameter.
235 substitution: Substitution::from1(
237 TyKind::BoundVar(BoundVar {
238 debruijn: DebruijnIndex::INNERMOST,
244 let proj_bound = WhereClause::AliasEq(AliasEq {
245 alias: AliasTy::Projection(ProjectionTy {
246 associated_ty_id: to_assoc_type_id(future_output),
247 // Self type as the first parameter.
248 substitution: Substitution::from1(
250 TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0))
254 // The parameter of the opaque type.
255 ty: TyKind::BoundVar(BoundVar { debruijn: DebruijnIndex::ONE, index: 0 })
258 let bound = OpaqueTyDatumBound {
259 bounds: make_single_type_binders(vec![
260 crate::wrap_empty_binders(impl_bound),
261 crate::wrap_empty_binders(proj_bound),
263 where_clauses: chalk_ir::Binders::empty(Interner, vec![]),
265 // The opaque type has 1 parameter.
266 make_single_type_binders(bound)
268 // If failed to find Symbol’s value as variable is void: Future::Output, return empty bounds as fallback.
269 let bound = OpaqueTyDatumBound {
270 bounds: chalk_ir::Binders::empty(Interner, vec![]),
271 where_clauses: chalk_ir::Binders::empty(Interner, vec![]),
273 // The opaque type has 1 parameter.
274 make_single_type_binders(bound)
279 Arc::new(OpaqueTyDatum { opaque_ty_id: id, bound })
282 fn hidden_opaque_type(&self, _id: chalk_ir::OpaqueTyId<Interner>) -> chalk_ir::Ty<Interner> {
283 // FIXME: actually provide the hidden type; it is relevant for auto traits
284 TyKind::Error.intern(Interner)
287 fn is_object_safe(&self, _trait_id: chalk_ir::TraitId<Interner>) -> bool {
288 // FIXME: implement actual object safety
294 _closure_id: chalk_ir::ClosureId<Interner>,
295 _substs: &chalk_ir::Substitution<Interner>,
296 ) -> rust_ir::ClosureKind {
297 // Fn is the closure kind that implements all three traits
298 rust_ir::ClosureKind::Fn
300 fn closure_inputs_and_output(
302 _closure_id: chalk_ir::ClosureId<Interner>,
303 substs: &chalk_ir::Substitution<Interner>,
304 ) -> chalk_ir::Binders<rust_ir::FnDefInputsAndOutputDatum<Interner>> {
305 let sig_ty = substs.at(Interner, 0).assert_ty_ref(Interner).clone();
306 let sig = &sig_ty.callable_sig(self.db).expect("first closure param should be fn ptr");
307 let io = rust_ir::FnDefInputsAndOutputDatum {
308 argument_types: sig.params().to_vec(),
309 return_type: sig.ret().clone(),
311 chalk_ir::Binders::empty(Interner, io.shifted_in(Interner))
315 _closure_id: chalk_ir::ClosureId<Interner>,
316 _substs: &chalk_ir::Substitution<Interner>,
317 ) -> chalk_ir::Binders<chalk_ir::Ty<Interner>> {
318 let ty = TyBuilder::unit();
319 chalk_ir::Binders::empty(Interner, ty)
321 fn closure_fn_substitution(
323 _closure_id: chalk_ir::ClosureId<Interner>,
324 _substs: &chalk_ir::Substitution<Interner>,
325 ) -> chalk_ir::Substitution<Interner> {
326 Substitution::empty(Interner)
329 fn trait_name(&self, trait_id: chalk_ir::TraitId<Interner>) -> String {
330 let id = from_chalk_trait_id(trait_id);
331 self.db.trait_data(id).name.to_string()
333 fn adt_name(&self, chalk_ir::AdtId(adt_id): AdtId) -> String {
335 hir_def::AdtId::StructId(id) => self.db.struct_data(id).name.to_string(),
336 hir_def::AdtId::EnumId(id) => self.db.enum_data(id).name.to_string(),
337 hir_def::AdtId::UnionId(id) => self.db.union_data(id).name.to_string(),
340 fn adt_size_align(&self, _id: chalk_ir::AdtId<Interner>) -> Arc<rust_ir::AdtSizeAlign> {
342 Arc::new(rust_ir::AdtSizeAlign::from_one_zst(false))
344 fn assoc_type_name(&self, assoc_ty_id: chalk_ir::AssocTypeId<Interner>) -> String {
345 let id = self.db.associated_ty_data(assoc_ty_id).name;
346 self.db.type_alias_data(id).name.to_string()
348 fn opaque_type_name(&self, opaque_ty_id: chalk_ir::OpaqueTyId<Interner>) -> String {
349 format!("Opaque_{}", opaque_ty_id.0)
351 fn fn_def_name(&self, fn_def_id: chalk_ir::FnDefId<Interner>) -> String {
352 format!("fn_{}", fn_def_id.0)
356 _: chalk_ir::GeneratorId<Interner>,
357 ) -> std::sync::Arc<chalk_solve::rust_ir::GeneratorDatum<Interner>> {
361 fn generator_witness_datum(
363 _: chalk_ir::GeneratorId<Interner>,
364 ) -> std::sync::Arc<chalk_solve::rust_ir::GeneratorWitnessDatum<Interner>> {
369 fn unification_database(&self) -> &dyn chalk_ir::UnificationDatabase<Interner> {
374 impl<'a> chalk_ir::UnificationDatabase<Interner> for &'a dyn HirDatabase {
377 fn_def_id: chalk_ir::FnDefId<Interner>,
378 ) -> chalk_ir::Variances<Interner> {
379 HirDatabase::fn_def_variance(*self, fn_def_id)
382 fn adt_variance(&self, adt_id: chalk_ir::AdtId<Interner>) -> chalk_ir::Variances<Interner> {
383 HirDatabase::adt_variance(*self, adt_id)
387 pub(crate) fn program_clauses_for_chalk_env_query(
388 db: &dyn HirDatabase,
390 environment: chalk_ir::Environment<Interner>,
391 ) -> chalk_ir::ProgramClauses<Interner> {
392 chalk_solve::program_clauses_for_env(&ChalkContext { db, krate }, &environment)
395 pub(crate) fn associated_ty_data_query(
396 db: &dyn HirDatabase,
398 ) -> Arc<AssociatedTyDatum> {
399 debug!("associated_ty_data {:?}", id);
400 let type_alias: TypeAliasId = from_assoc_type_id(id);
401 let trait_ = match type_alias.lookup(db.upcast()).container {
402 ItemContainerId::TraitId(t) => t,
403 _ => panic!("associated type not in trait"),
406 // Lower bounds -- we could/should maybe move this to a separate query in `lower`
407 let type_alias_data = db.type_alias_data(type_alias);
408 let generic_params = generics(db.upcast(), type_alias.into());
409 // let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST);
410 let resolver = hir_def::resolver::HasResolver::resolver(type_alias, db.upcast());
411 let ctx = crate::TyLoweringContext::new(db, &resolver)
412 .with_type_param_mode(crate::lower::ParamLoweringMode::Variable);
413 let pro_ty = TyBuilder::assoc_type_projection(db, type_alias)
414 .fill_with_bound_vars(crate::DebruijnIndex::INNERMOST, 0)
416 let self_ty = TyKind::Alias(AliasTy::Projection(pro_ty)).intern(Interner);
417 let mut bounds: Vec<_> = type_alias_data
420 .flat_map(|bound| ctx.lower_type_bound(bound, self_ty.clone(), false))
421 .filter_map(|pred| generic_predicate_to_inline_bound(db, &pred, &self_ty))
424 if !ctx.unsized_types.borrow().contains(&self_ty) {
426 .lang_item(resolver.krate(), SmolStr::new_inline("sized"))
427 .and_then(|lang_item| lang_item.as_trait().map(to_chalk_trait_id));
428 let sized_bound = sized_trait.into_iter().map(|sized_trait| {
430 rust_ir::TraitBound { trait_id: sized_trait, args_no_self: Default::default() };
431 let inline_bound = rust_ir::InlineBound::TraitBound(trait_bound);
432 chalk_ir::Binders::empty(Interner, inline_bound)
434 bounds.extend(sized_bound);
435 bounds.shrink_to_fit();
438 // FIXME: Re-enable where clauses on associated types when an upstream chalk bug is fixed.
439 // (rust-analyzer#9052)
440 // let where_clauses = convert_where_clauses(db, type_alias.into(), &bound_vars);
441 let bound_data = rust_ir::AssociatedTyDatumBound { bounds, where_clauses: vec![] };
442 let datum = AssociatedTyDatum {
443 trait_id: to_chalk_trait_id(trait_),
446 binders: make_binders(db, &generic_params, bound_data),
451 pub(crate) fn trait_datum_query(
452 db: &dyn HirDatabase,
455 ) -> Arc<TraitDatum> {
456 debug!("trait_datum {:?}", trait_id);
457 let trait_ = from_chalk_trait_id(trait_id);
458 let trait_data = db.trait_data(trait_);
459 debug!("trait {:?} = {:?}", trait_id, trait_data.name);
460 let generic_params = generics(db.upcast(), trait_.into());
461 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
462 let flags = rust_ir::TraitFlags {
463 auto: trait_data.is_auto,
464 upstream: trait_.lookup(db.upcast()).container.krate() != krate,
465 non_enumerable: true,
466 coinductive: false, // only relevant for Chalk testing
467 // FIXME: set these flags correctly
471 let where_clauses = convert_where_clauses(db, trait_.into(), &bound_vars);
472 let associated_ty_ids = trait_data.associated_types().map(to_assoc_type_id).collect();
473 let trait_datum_bound = rust_ir::TraitDatumBound { where_clauses };
475 lang_attr(db.upcast(), trait_).and_then(|name| well_known_trait_from_lang_attr(&name));
476 let trait_datum = TraitDatum {
478 binders: make_binders(db, &generic_params, trait_datum_bound),
483 Arc::new(trait_datum)
486 fn well_known_trait_from_lang_attr(name: &str) -> Option<WellKnownTrait> {
488 "clone" => WellKnownTrait::Clone,
489 "coerce_unsized" => WellKnownTrait::CoerceUnsized,
490 "copy" => WellKnownTrait::Copy,
491 "discriminant_kind" => WellKnownTrait::DiscriminantKind,
492 "dispatch_from_dyn" => WellKnownTrait::DispatchFromDyn,
493 "drop" => WellKnownTrait::Drop,
494 "fn" => WellKnownTrait::Fn,
495 "fn_mut" => WellKnownTrait::FnMut,
496 "fn_once" => WellKnownTrait::FnOnce,
497 "generator" => WellKnownTrait::Generator,
498 "sized" => WellKnownTrait::Sized,
499 "unpin" => WellKnownTrait::Unpin,
500 "unsize" => WellKnownTrait::Unsize,
505 fn lang_attr_from_well_known_trait(attr: WellKnownTrait) -> &'static str {
507 WellKnownTrait::Clone => "clone",
508 WellKnownTrait::CoerceUnsized => "coerce_unsized",
509 WellKnownTrait::Copy => "copy",
510 WellKnownTrait::DiscriminantKind => "discriminant_kind",
511 WellKnownTrait::DispatchFromDyn => "dispatch_from_dyn",
512 WellKnownTrait::Drop => "drop",
513 WellKnownTrait::Fn => "fn",
514 WellKnownTrait::FnMut => "fn_mut",
515 WellKnownTrait::FnOnce => "fn_once",
516 WellKnownTrait::Generator => "generator",
517 WellKnownTrait::Sized => "sized",
518 WellKnownTrait::Unpin => "unpin",
519 WellKnownTrait::Unsize => "unsize",
523 pub(crate) fn struct_datum_query(
524 db: &dyn HirDatabase,
527 ) -> Arc<StructDatum> {
528 debug!("struct_datum {:?}", struct_id);
529 let chalk_ir::AdtId(adt_id) = struct_id;
530 let generic_params = generics(db.upcast(), adt_id.into());
531 let upstream = adt_id.module(db.upcast()).krate() != krate;
532 let where_clauses = {
533 let generic_params = generics(db.upcast(), adt_id.into());
534 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
535 convert_where_clauses(db, adt_id.into(), &bound_vars)
537 let flags = rust_ir::AdtFlags {
539 // FIXME set fundamental and phantom_data flags correctly
543 // FIXME provide enum variants properly (for auto traits)
544 let variant = rust_ir::AdtVariantDatum {
545 fields: Vec::new(), // FIXME add fields (only relevant for auto traits),
547 let struct_datum_bound = rust_ir::AdtDatumBound { variants: vec![variant], where_clauses };
548 let struct_datum = StructDatum {
549 // FIXME set ADT kind
550 kind: rust_ir::AdtKind::Struct,
552 binders: make_binders(db, &generic_params, struct_datum_bound),
555 Arc::new(struct_datum)
558 pub(crate) fn impl_datum_query(
559 db: &dyn HirDatabase,
562 ) -> Arc<ImplDatum> {
563 let _p = profile::span("impl_datum");
564 debug!("impl_datum {:?}", impl_id);
565 let impl_: hir_def::ImplId = from_chalk(db, impl_id);
566 impl_def_datum(db, krate, impl_id, impl_)
570 db: &dyn HirDatabase,
573 impl_id: hir_def::ImplId,
574 ) -> Arc<ImplDatum> {
577 // ImplIds for impls where the trait ref can't be resolved should never reach Chalk
578 .expect("invalid impl passed to Chalk")
579 .into_value_and_skipped_binders()
581 let impl_data = db.impl_data(impl_id);
583 let generic_params = generics(db.upcast(), impl_id.into());
584 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
585 let trait_ = trait_ref.hir_trait_id();
586 let impl_type = if impl_id.lookup(db.upcast()).container.krate() == krate {
587 rust_ir::ImplType::Local
589 rust_ir::ImplType::External
591 let where_clauses = convert_where_clauses(db, impl_id.into(), &bound_vars);
592 let negative = impl_data.is_negative;
594 "impl {:?}: {}{} where {:?}",
596 if negative { "!" } else { "" },
597 trait_ref.display(db),
601 let polarity = if negative { rust_ir::Polarity::Negative } else { rust_ir::Polarity::Positive };
603 let impl_datum_bound = rust_ir::ImplDatumBound { trait_ref, where_clauses };
604 let trait_data = db.trait_data(trait_);
605 let associated_ty_value_ids = impl_data
608 .filter_map(|item| match item {
609 AssocItemId::TypeAliasId(type_alias) => Some(*type_alias),
612 .filter(|&type_alias| {
613 // don't include associated types that don't exist in the trait
614 let name = &db.type_alias_data(type_alias).name;
615 trait_data.associated_type_by_name(name).is_some()
617 .map(|type_alias| TypeAliasAsValue(type_alias).to_chalk(db))
619 debug!("impl_datum: {:?}", impl_datum_bound);
620 let impl_datum = ImplDatum {
621 binders: make_binders(db, &generic_params, impl_datum_bound),
624 associated_ty_value_ids,
629 pub(crate) fn associated_ty_value_query(
630 db: &dyn HirDatabase,
632 id: AssociatedTyValueId,
633 ) -> Arc<AssociatedTyValue> {
634 let type_alias: TypeAliasAsValue = from_chalk(db, id);
635 type_alias_associated_ty_value(db, krate, type_alias.0)
638 fn type_alias_associated_ty_value(
639 db: &dyn HirDatabase,
641 type_alias: TypeAliasId,
642 ) -> Arc<AssociatedTyValue> {
643 let type_alias_data = db.type_alias_data(type_alias);
644 let impl_id = match type_alias.lookup(db.upcast()).container {
645 ItemContainerId::ImplId(it) => it,
646 _ => panic!("assoc ty value should be in impl"),
651 .expect("assoc ty value should not exist")
652 .into_value_and_skipped_binders()
653 .0; // we don't return any assoc ty values if the impl'd trait can't be resolved
656 .trait_data(trait_ref.hir_trait_id())
657 .associated_type_by_name(&type_alias_data.name)
658 .expect("assoc ty value should not exist"); // validated when building the impl data as well
659 let (ty, binders) = db.ty(type_alias.into()).into_value_and_skipped_binders();
660 let value_bound = rust_ir::AssociatedTyValueBound { ty };
661 let value = rust_ir::AssociatedTyValue {
662 impl_id: impl_id.to_chalk(db),
663 associated_ty_id: to_assoc_type_id(assoc_ty),
664 value: chalk_ir::Binders::new(binders, value_bound),
669 pub(crate) fn fn_def_datum_query(
670 db: &dyn HirDatabase,
673 ) -> Arc<FnDefDatum> {
674 let callable_def: CallableDefId = from_chalk(db, fn_def_id);
675 let generic_params = generics(db.upcast(), callable_def.into());
676 let (sig, binders) = db.callable_item_signature(callable_def).into_value_and_skipped_binders();
677 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
678 let where_clauses = convert_where_clauses(db, callable_def.into(), &bound_vars);
679 let bound = rust_ir::FnDefDatumBound {
680 // Note: Chalk doesn't actually use this information yet as far as I am aware, but we provide it anyway
681 inputs_and_output: chalk_ir::Binders::empty(
683 rust_ir::FnDefInputsAndOutputDatum {
684 argument_types: sig.params().to_vec(),
685 return_type: sig.ret().clone(),
687 .shifted_in(Interner),
691 let datum = FnDefDatum {
693 sig: chalk_ir::FnSig { abi: (), safety: chalk_ir::Safety::Safe, variadic: sig.is_varargs },
694 binders: chalk_ir::Binders::new(binders, bound),
699 pub(crate) fn fn_def_variance_query(db: &dyn HirDatabase, fn_def_id: FnDefId) -> Variances {
700 let callable_def: CallableDefId = from_chalk(db, fn_def_id);
701 let generic_params = generics(db.upcast(), callable_def.into());
702 Variances::from_iter(
704 std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
708 pub(crate) fn adt_variance_query(
709 db: &dyn HirDatabase,
710 chalk_ir::AdtId(adt_id): AdtId,
712 let generic_params = generics(db.upcast(), adt_id.into());
713 Variances::from_iter(
715 std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
719 pub(super) fn convert_where_clauses(
720 db: &dyn HirDatabase,
722 substs: &Substitution,
723 ) -> Vec<chalk_ir::QuantifiedWhereClause<Interner>> {
724 let generic_predicates = db.generic_predicates(def);
725 let mut result = Vec::with_capacity(generic_predicates.len());
726 for pred in generic_predicates.iter() {
727 result.push(pred.clone().substitute(Interner, substs));
732 pub(super) fn generic_predicate_to_inline_bound(
733 db: &dyn HirDatabase,
734 pred: &QuantifiedWhereClause,
736 ) -> Option<chalk_ir::Binders<rust_ir::InlineBound<Interner>>> {
737 // An InlineBound is like a GenericPredicate, except the self type is left out.
738 // We don't have a special type for this, but Chalk does.
739 let self_ty_shifted_in = self_ty.clone().shifted_in_from(Interner, DebruijnIndex::ONE);
740 let (pred, binders) = pred.as_ref().into_value_and_skipped_binders();
742 WhereClause::Implemented(trait_ref) => {
743 if trait_ref.self_type_parameter(Interner) != self_ty_shifted_in {
744 // we can only convert predicates back to type bounds if they
745 // have the expected self type
748 let args_no_self = trait_ref.substitution.as_slice(Interner)[1..]
750 .map(|ty| ty.clone().cast(Interner))
752 let trait_bound = rust_ir::TraitBound { trait_id: trait_ref.trait_id, args_no_self };
753 Some(chalk_ir::Binders::new(binders, rust_ir::InlineBound::TraitBound(trait_bound)))
755 WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => {
756 if projection_ty.self_type_parameter(Interner) != self_ty_shifted_in {
759 let trait_ = projection_ty.trait_(db);
760 let args_no_self = projection_ty.substitution.as_slice(Interner)[1..]
762 .map(|ty| ty.clone().cast(Interner))
764 let alias_eq_bound = rust_ir::AliasEqBound {
766 trait_bound: rust_ir::TraitBound {
767 trait_id: to_chalk_trait_id(trait_),
770 associated_ty_id: projection_ty.associated_ty_id,
771 parameters: Vec::new(), // FIXME we don't support generic associated types yet
773 Some(chalk_ir::Binders::new(
775 rust_ir::InlineBound::AliasEqBound(alias_eq_bound),