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 mut binder = vec![];
245 binder.push(crate::wrap_empty_binders(impl_bound));
246 let sized_trait = self
248 .lang_item(self.krate, SmolStr::new_inline("sized"))
249 .and_then(|item| item.as_trait());
250 if let Some(sized_trait_) = sized_trait {
251 let sized_bound = WhereClause::Implemented(TraitRef {
252 trait_id: to_chalk_trait_id(sized_trait_),
253 // Self type as the first parameter.
254 substitution: Substitution::from1(
256 TyKind::BoundVar(BoundVar {
257 debruijn: DebruijnIndex::INNERMOST,
263 binder.push(crate::wrap_empty_binders(sized_bound));
265 let proj_bound = WhereClause::AliasEq(AliasEq {
266 alias: AliasTy::Projection(ProjectionTy {
267 associated_ty_id: to_assoc_type_id(future_output),
268 // Self type as the first parameter.
269 substitution: Substitution::from1(
271 TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0))
275 // The parameter of the opaque type.
276 ty: TyKind::BoundVar(BoundVar { debruijn: DebruijnIndex::ONE, index: 0 })
279 binder.push(crate::wrap_empty_binders(proj_bound));
280 let bound = OpaqueTyDatumBound {
281 bounds: make_single_type_binders(binder),
282 where_clauses: chalk_ir::Binders::empty(Interner, vec![]),
284 // The opaque type has 1 parameter.
285 make_single_type_binders(bound)
287 // If failed to find Symbol’s value as variable is void: Future::Output, return empty bounds as fallback.
288 let bound = OpaqueTyDatumBound {
289 bounds: chalk_ir::Binders::empty(Interner, vec![]),
290 where_clauses: chalk_ir::Binders::empty(Interner, vec![]),
292 // The opaque type has 1 parameter.
293 make_single_type_binders(bound)
298 Arc::new(OpaqueTyDatum { opaque_ty_id: id, bound })
301 fn hidden_opaque_type(&self, _id: chalk_ir::OpaqueTyId<Interner>) -> chalk_ir::Ty<Interner> {
302 // FIXME: actually provide the hidden type; it is relevant for auto traits
303 TyKind::Error.intern(Interner)
306 fn is_object_safe(&self, _trait_id: chalk_ir::TraitId<Interner>) -> bool {
307 // FIXME: implement actual object safety
313 _closure_id: chalk_ir::ClosureId<Interner>,
314 _substs: &chalk_ir::Substitution<Interner>,
315 ) -> rust_ir::ClosureKind {
316 // Fn is the closure kind that implements all three traits
317 rust_ir::ClosureKind::Fn
319 fn closure_inputs_and_output(
321 _closure_id: chalk_ir::ClosureId<Interner>,
322 substs: &chalk_ir::Substitution<Interner>,
323 ) -> chalk_ir::Binders<rust_ir::FnDefInputsAndOutputDatum<Interner>> {
324 let sig_ty = substs.at(Interner, 0).assert_ty_ref(Interner).clone();
325 let sig = &sig_ty.callable_sig(self.db).expect("first closure param should be fn ptr");
326 let io = rust_ir::FnDefInputsAndOutputDatum {
327 argument_types: sig.params().to_vec(),
328 return_type: sig.ret().clone(),
330 chalk_ir::Binders::empty(Interner, io.shifted_in(Interner))
334 _closure_id: chalk_ir::ClosureId<Interner>,
335 _substs: &chalk_ir::Substitution<Interner>,
336 ) -> chalk_ir::Binders<chalk_ir::Ty<Interner>> {
337 let ty = TyBuilder::unit();
338 chalk_ir::Binders::empty(Interner, ty)
340 fn closure_fn_substitution(
342 _closure_id: chalk_ir::ClosureId<Interner>,
343 _substs: &chalk_ir::Substitution<Interner>,
344 ) -> chalk_ir::Substitution<Interner> {
345 Substitution::empty(Interner)
348 fn trait_name(&self, trait_id: chalk_ir::TraitId<Interner>) -> String {
349 let id = from_chalk_trait_id(trait_id);
350 self.db.trait_data(id).name.to_string()
352 fn adt_name(&self, chalk_ir::AdtId(adt_id): AdtId) -> String {
354 hir_def::AdtId::StructId(id) => self.db.struct_data(id).name.to_string(),
355 hir_def::AdtId::EnumId(id) => self.db.enum_data(id).name.to_string(),
356 hir_def::AdtId::UnionId(id) => self.db.union_data(id).name.to_string(),
359 fn adt_size_align(&self, _id: chalk_ir::AdtId<Interner>) -> Arc<rust_ir::AdtSizeAlign> {
361 Arc::new(rust_ir::AdtSizeAlign::from_one_zst(false))
363 fn assoc_type_name(&self, assoc_ty_id: chalk_ir::AssocTypeId<Interner>) -> String {
364 let id = self.db.associated_ty_data(assoc_ty_id).name;
365 self.db.type_alias_data(id).name.to_string()
367 fn opaque_type_name(&self, opaque_ty_id: chalk_ir::OpaqueTyId<Interner>) -> String {
368 format!("Opaque_{}", opaque_ty_id.0)
370 fn fn_def_name(&self, fn_def_id: chalk_ir::FnDefId<Interner>) -> String {
371 format!("fn_{}", fn_def_id.0)
375 _: chalk_ir::GeneratorId<Interner>,
376 ) -> std::sync::Arc<chalk_solve::rust_ir::GeneratorDatum<Interner>> {
380 fn generator_witness_datum(
382 _: chalk_ir::GeneratorId<Interner>,
383 ) -> std::sync::Arc<chalk_solve::rust_ir::GeneratorWitnessDatum<Interner>> {
388 fn unification_database(&self) -> &dyn chalk_ir::UnificationDatabase<Interner> {
393 impl<'a> chalk_ir::UnificationDatabase<Interner> for &'a dyn HirDatabase {
396 fn_def_id: chalk_ir::FnDefId<Interner>,
397 ) -> chalk_ir::Variances<Interner> {
398 HirDatabase::fn_def_variance(*self, fn_def_id)
401 fn adt_variance(&self, adt_id: chalk_ir::AdtId<Interner>) -> chalk_ir::Variances<Interner> {
402 HirDatabase::adt_variance(*self, adt_id)
406 pub(crate) fn program_clauses_for_chalk_env_query(
407 db: &dyn HirDatabase,
409 environment: chalk_ir::Environment<Interner>,
410 ) -> chalk_ir::ProgramClauses<Interner> {
411 chalk_solve::program_clauses_for_env(&ChalkContext { db, krate }, &environment)
414 pub(crate) fn associated_ty_data_query(
415 db: &dyn HirDatabase,
417 ) -> Arc<AssociatedTyDatum> {
418 debug!("associated_ty_data {:?}", id);
419 let type_alias: TypeAliasId = from_assoc_type_id(id);
420 let trait_ = match type_alias.lookup(db.upcast()).container {
421 ItemContainerId::TraitId(t) => t,
422 _ => panic!("associated type not in trait"),
425 // Lower bounds -- we could/should maybe move this to a separate query in `lower`
426 let type_alias_data = db.type_alias_data(type_alias);
427 let generic_params = generics(db.upcast(), type_alias.into());
428 // let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST);
429 let resolver = hir_def::resolver::HasResolver::resolver(type_alias, db.upcast());
430 let ctx = crate::TyLoweringContext::new(db, &resolver)
431 .with_type_param_mode(crate::lower::ParamLoweringMode::Variable);
432 let pro_ty = TyBuilder::assoc_type_projection(db, type_alias)
433 .fill_with_bound_vars(crate::DebruijnIndex::INNERMOST, 0)
435 let self_ty = TyKind::Alias(AliasTy::Projection(pro_ty)).intern(Interner);
436 let mut bounds: Vec<_> = type_alias_data
439 .flat_map(|bound| ctx.lower_type_bound(bound, self_ty.clone(), false))
440 .filter_map(|pred| generic_predicate_to_inline_bound(db, &pred, &self_ty))
443 if !ctx.unsized_types.borrow().contains(&self_ty) {
445 .lang_item(resolver.krate(), SmolStr::new_inline("sized"))
446 .and_then(|lang_item| lang_item.as_trait().map(to_chalk_trait_id));
447 let sized_bound = sized_trait.into_iter().map(|sized_trait| {
449 rust_ir::TraitBound { trait_id: sized_trait, args_no_self: Default::default() };
450 let inline_bound = rust_ir::InlineBound::TraitBound(trait_bound);
451 chalk_ir::Binders::empty(Interner, inline_bound)
453 bounds.extend(sized_bound);
454 bounds.shrink_to_fit();
457 // FIXME: Re-enable where clauses on associated types when an upstream chalk bug is fixed.
458 // (rust-analyzer#9052)
459 // let where_clauses = convert_where_clauses(db, type_alias.into(), &bound_vars);
460 let bound_data = rust_ir::AssociatedTyDatumBound { bounds, where_clauses: vec![] };
461 let datum = AssociatedTyDatum {
462 trait_id: to_chalk_trait_id(trait_),
465 binders: make_binders(db, &generic_params, bound_data),
470 pub(crate) fn trait_datum_query(
471 db: &dyn HirDatabase,
474 ) -> Arc<TraitDatum> {
475 debug!("trait_datum {:?}", trait_id);
476 let trait_ = from_chalk_trait_id(trait_id);
477 let trait_data = db.trait_data(trait_);
478 debug!("trait {:?} = {:?}", trait_id, trait_data.name);
479 let generic_params = generics(db.upcast(), trait_.into());
480 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
481 let flags = rust_ir::TraitFlags {
482 auto: trait_data.is_auto,
483 upstream: trait_.lookup(db.upcast()).container.krate() != krate,
484 non_enumerable: true,
485 coinductive: false, // only relevant for Chalk testing
486 // FIXME: set these flags correctly
490 let where_clauses = convert_where_clauses(db, trait_.into(), &bound_vars);
491 let associated_ty_ids = trait_data.associated_types().map(to_assoc_type_id).collect();
492 let trait_datum_bound = rust_ir::TraitDatumBound { where_clauses };
494 lang_attr(db.upcast(), trait_).and_then(|name| well_known_trait_from_lang_attr(&name));
495 let trait_datum = TraitDatum {
497 binders: make_binders(db, &generic_params, trait_datum_bound),
502 Arc::new(trait_datum)
505 fn well_known_trait_from_lang_attr(name: &str) -> Option<WellKnownTrait> {
507 "clone" => WellKnownTrait::Clone,
508 "coerce_unsized" => WellKnownTrait::CoerceUnsized,
509 "copy" => WellKnownTrait::Copy,
510 "discriminant_kind" => WellKnownTrait::DiscriminantKind,
511 "dispatch_from_dyn" => WellKnownTrait::DispatchFromDyn,
512 "drop" => WellKnownTrait::Drop,
513 "fn" => WellKnownTrait::Fn,
514 "fn_mut" => WellKnownTrait::FnMut,
515 "fn_once" => WellKnownTrait::FnOnce,
516 "generator" => WellKnownTrait::Generator,
517 "sized" => WellKnownTrait::Sized,
518 "unpin" => WellKnownTrait::Unpin,
519 "unsize" => WellKnownTrait::Unsize,
524 fn lang_attr_from_well_known_trait(attr: WellKnownTrait) -> &'static str {
526 WellKnownTrait::Clone => "clone",
527 WellKnownTrait::CoerceUnsized => "coerce_unsized",
528 WellKnownTrait::Copy => "copy",
529 WellKnownTrait::DiscriminantKind => "discriminant_kind",
530 WellKnownTrait::DispatchFromDyn => "dispatch_from_dyn",
531 WellKnownTrait::Drop => "drop",
532 WellKnownTrait::Fn => "fn",
533 WellKnownTrait::FnMut => "fn_mut",
534 WellKnownTrait::FnOnce => "fn_once",
535 WellKnownTrait::Generator => "generator",
536 WellKnownTrait::Sized => "sized",
537 WellKnownTrait::Unpin => "unpin",
538 WellKnownTrait::Unsize => "unsize",
542 pub(crate) fn struct_datum_query(
543 db: &dyn HirDatabase,
546 ) -> Arc<StructDatum> {
547 debug!("struct_datum {:?}", struct_id);
548 let chalk_ir::AdtId(adt_id) = struct_id;
549 let generic_params = generics(db.upcast(), adt_id.into());
550 let upstream = adt_id.module(db.upcast()).krate() != krate;
551 let where_clauses = {
552 let generic_params = generics(db.upcast(), adt_id.into());
553 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
554 convert_where_clauses(db, adt_id.into(), &bound_vars)
556 let flags = rust_ir::AdtFlags {
558 // FIXME set fundamental and phantom_data flags correctly
562 // FIXME provide enum variants properly (for auto traits)
563 let variant = rust_ir::AdtVariantDatum {
564 fields: Vec::new(), // FIXME add fields (only relevant for auto traits),
566 let struct_datum_bound = rust_ir::AdtDatumBound { variants: vec![variant], where_clauses };
567 let struct_datum = StructDatum {
568 // FIXME set ADT kind
569 kind: rust_ir::AdtKind::Struct,
571 binders: make_binders(db, &generic_params, struct_datum_bound),
574 Arc::new(struct_datum)
577 pub(crate) fn impl_datum_query(
578 db: &dyn HirDatabase,
581 ) -> Arc<ImplDatum> {
582 let _p = profile::span("impl_datum");
583 debug!("impl_datum {:?}", impl_id);
584 let impl_: hir_def::ImplId = from_chalk(db, impl_id);
585 impl_def_datum(db, krate, impl_id, impl_)
589 db: &dyn HirDatabase,
592 impl_id: hir_def::ImplId,
593 ) -> Arc<ImplDatum> {
596 // ImplIds for impls where the trait ref can't be resolved should never reach Chalk
597 .expect("invalid impl passed to Chalk")
598 .into_value_and_skipped_binders()
600 let impl_data = db.impl_data(impl_id);
602 let generic_params = generics(db.upcast(), impl_id.into());
603 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
604 let trait_ = trait_ref.hir_trait_id();
605 let impl_type = if impl_id.lookup(db.upcast()).container.krate() == krate {
606 rust_ir::ImplType::Local
608 rust_ir::ImplType::External
610 let where_clauses = convert_where_clauses(db, impl_id.into(), &bound_vars);
611 let negative = impl_data.is_negative;
613 "impl {:?}: {}{} where {:?}",
615 if negative { "!" } else { "" },
616 trait_ref.display(db),
620 let polarity = if negative { rust_ir::Polarity::Negative } else { rust_ir::Polarity::Positive };
622 let impl_datum_bound = rust_ir::ImplDatumBound { trait_ref, where_clauses };
623 let trait_data = db.trait_data(trait_);
624 let associated_ty_value_ids = impl_data
627 .filter_map(|item| match item {
628 AssocItemId::TypeAliasId(type_alias) => Some(*type_alias),
631 .filter(|&type_alias| {
632 // don't include associated types that don't exist in the trait
633 let name = &db.type_alias_data(type_alias).name;
634 trait_data.associated_type_by_name(name).is_some()
636 .map(|type_alias| TypeAliasAsValue(type_alias).to_chalk(db))
638 debug!("impl_datum: {:?}", impl_datum_bound);
639 let impl_datum = ImplDatum {
640 binders: make_binders(db, &generic_params, impl_datum_bound),
643 associated_ty_value_ids,
648 pub(crate) fn associated_ty_value_query(
649 db: &dyn HirDatabase,
651 id: AssociatedTyValueId,
652 ) -> Arc<AssociatedTyValue> {
653 let type_alias: TypeAliasAsValue = from_chalk(db, id);
654 type_alias_associated_ty_value(db, krate, type_alias.0)
657 fn type_alias_associated_ty_value(
658 db: &dyn HirDatabase,
660 type_alias: TypeAliasId,
661 ) -> Arc<AssociatedTyValue> {
662 let type_alias_data = db.type_alias_data(type_alias);
663 let impl_id = match type_alias.lookup(db.upcast()).container {
664 ItemContainerId::ImplId(it) => it,
665 _ => panic!("assoc ty value should be in impl"),
670 .expect("assoc ty value should not exist")
671 .into_value_and_skipped_binders()
672 .0; // we don't return any assoc ty values if the impl'd trait can't be resolved
675 .trait_data(trait_ref.hir_trait_id())
676 .associated_type_by_name(&type_alias_data.name)
677 .expect("assoc ty value should not exist"); // validated when building the impl data as well
678 let (ty, binders) = db.ty(type_alias.into()).into_value_and_skipped_binders();
679 let value_bound = rust_ir::AssociatedTyValueBound { ty };
680 let value = rust_ir::AssociatedTyValue {
681 impl_id: impl_id.to_chalk(db),
682 associated_ty_id: to_assoc_type_id(assoc_ty),
683 value: chalk_ir::Binders::new(binders, value_bound),
688 pub(crate) fn fn_def_datum_query(
689 db: &dyn HirDatabase,
692 ) -> Arc<FnDefDatum> {
693 let callable_def: CallableDefId = from_chalk(db, fn_def_id);
694 let generic_params = generics(db.upcast(), callable_def.into());
695 let (sig, binders) = db.callable_item_signature(callable_def).into_value_and_skipped_binders();
696 let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
697 let where_clauses = convert_where_clauses(db, callable_def.into(), &bound_vars);
698 let bound = rust_ir::FnDefDatumBound {
699 // Note: Chalk doesn't actually use this information yet as far as I am aware, but we provide it anyway
700 inputs_and_output: chalk_ir::Binders::empty(
702 rust_ir::FnDefInputsAndOutputDatum {
703 argument_types: sig.params().to_vec(),
704 return_type: sig.ret().clone(),
706 .shifted_in(Interner),
710 let datum = FnDefDatum {
712 sig: chalk_ir::FnSig { abi: (), safety: chalk_ir::Safety::Safe, variadic: sig.is_varargs },
713 binders: chalk_ir::Binders::new(binders, bound),
718 pub(crate) fn fn_def_variance_query(db: &dyn HirDatabase, fn_def_id: FnDefId) -> Variances {
719 let callable_def: CallableDefId = from_chalk(db, fn_def_id);
720 let generic_params = generics(db.upcast(), callable_def.into());
721 Variances::from_iter(
723 std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
727 pub(crate) fn adt_variance_query(
728 db: &dyn HirDatabase,
729 chalk_ir::AdtId(adt_id): AdtId,
731 let generic_params = generics(db.upcast(), adt_id.into());
732 Variances::from_iter(
734 std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
738 pub(super) fn convert_where_clauses(
739 db: &dyn HirDatabase,
741 substs: &Substitution,
742 ) -> Vec<chalk_ir::QuantifiedWhereClause<Interner>> {
743 let generic_predicates = db.generic_predicates(def);
744 let mut result = Vec::with_capacity(generic_predicates.len());
745 for pred in generic_predicates.iter() {
746 result.push(pred.clone().substitute(Interner, substs));
751 pub(super) fn generic_predicate_to_inline_bound(
752 db: &dyn HirDatabase,
753 pred: &QuantifiedWhereClause,
755 ) -> Option<chalk_ir::Binders<rust_ir::InlineBound<Interner>>> {
756 // An InlineBound is like a GenericPredicate, except the self type is left out.
757 // We don't have a special type for this, but Chalk does.
758 let self_ty_shifted_in = self_ty.clone().shifted_in_from(Interner, DebruijnIndex::ONE);
759 let (pred, binders) = pred.as_ref().into_value_and_skipped_binders();
761 WhereClause::Implemented(trait_ref) => {
762 if trait_ref.self_type_parameter(Interner) != self_ty_shifted_in {
763 // we can only convert predicates back to type bounds if they
764 // have the expected self type
767 let args_no_self = trait_ref.substitution.as_slice(Interner)[1..]
769 .map(|ty| ty.clone().cast(Interner))
771 let trait_bound = rust_ir::TraitBound { trait_id: trait_ref.trait_id, args_no_self };
772 Some(chalk_ir::Binders::new(binders, rust_ir::InlineBound::TraitBound(trait_bound)))
774 WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => {
775 if projection_ty.self_type_parameter(Interner) != self_ty_shifted_in {
778 let trait_ = projection_ty.trait_(db);
779 let args_no_self = projection_ty.substitution.as_slice(Interner)[1..]
781 .map(|ty| ty.clone().cast(Interner))
783 let alias_eq_bound = rust_ir::AliasEqBound {
785 trait_bound: rust_ir::TraitBound {
786 trait_id: to_chalk_trait_id(trait_),
789 associated_ty_id: projection_ty.associated_ty_id,
790 parameters: Vec::new(), // FIXME we don't support generic associated types yet
792 Some(chalk_ir::Binders::new(
794 rust_ir::InlineBound::AliasEqBound(alias_eq_bound),