From a87579500a2c35597071efd0ad6983927f0c1815 Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Wed, 27 Nov 2019 17:46:02 +0300 Subject: Move Ty --- crates/ra_hir/src/ty/traits/chalk.rs | 906 ----------------------------------- 1 file changed, 906 deletions(-) delete mode 100644 crates/ra_hir/src/ty/traits/chalk.rs (limited to 'crates/ra_hir/src/ty/traits/chalk.rs') diff --git a/crates/ra_hir/src/ty/traits/chalk.rs b/crates/ra_hir/src/ty/traits/chalk.rs deleted file mode 100644 index 67ac5422c..000000000 --- a/crates/ra_hir/src/ty/traits/chalk.rs +++ /dev/null @@ -1,906 +0,0 @@ -//! Conversion code from/to Chalk. -use std::sync::Arc; - -use log::debug; - -use chalk_ir::{ - cast::Cast, family::ChalkIr, Identifier, Parameter, PlaceholderIndex, TypeId, TypeKindId, - TypeName, UniverseIndex, -}; -use chalk_rust_ir::{AssociatedTyDatum, AssociatedTyValue, ImplDatum, StructDatum, TraitDatum}; -use ra_db::CrateId; - -use hir_def::{ - lang_item::LangItemTarget, resolver::HasResolver, AssocItemId, AstItemDef, ContainerId, - GenericDefId, ImplId, Lookup, TraitId, TypeAliasId, -}; -use hir_expand::name; - -use ra_db::salsa::{InternId, InternKey}; - -use super::{AssocTyValue, Canonical, ChalkContext, Impl, Obligation}; -use crate::{ - db::HirDatabase, - ty::display::HirDisplay, - ty::{ApplicationTy, GenericPredicate, ProjectionTy, Substs, TraitRef, Ty, TypeCtor, TypeWalk}, -}; - -/// This represents a trait whose name we could not resolve. -const UNKNOWN_TRAIT: chalk_ir::TraitId = - chalk_ir::TraitId(chalk_ir::RawId { index: u32::max_value() }); - -pub(super) trait ToChalk { - type Chalk; - fn to_chalk(self, db: &impl HirDatabase) -> Self::Chalk; - fn from_chalk(db: &impl HirDatabase, chalk: Self::Chalk) -> Self; -} - -pub(super) fn from_chalk(db: &impl HirDatabase, chalk: ChalkT) -> T -where - T: ToChalk, -{ - T::from_chalk(db, chalk) -} - -impl ToChalk for Ty { - type Chalk = chalk_ir::Ty; - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Ty { - match self { - Ty::Apply(apply_ty) => { - let name = match apply_ty.ctor { - TypeCtor::AssociatedType(type_alias) => { - let type_id = type_alias.to_chalk(db); - TypeName::AssociatedType(type_id) - } - _ => { - // other TypeCtors get interned and turned into a chalk StructId - let struct_id = apply_ty.ctor.to_chalk(db); - TypeName::TypeKindId(struct_id.into()) - } - }; - let parameters = apply_ty.parameters.to_chalk(db); - chalk_ir::ApplicationTy { name, parameters }.cast().intern() - } - Ty::Projection(proj_ty) => { - let associated_ty_id = proj_ty.associated_ty.to_chalk(db); - let parameters = proj_ty.parameters.to_chalk(db); - chalk_ir::ProjectionTy { associated_ty_id, parameters }.cast().intern() - } - Ty::Param { idx, .. } => { - PlaceholderIndex { ui: UniverseIndex::ROOT, idx: idx as usize }.to_ty::() - } - Ty::Bound(idx) => chalk_ir::TyData::BoundVar(idx as usize).intern(), - Ty::Infer(_infer_ty) => panic!("uncanonicalized infer ty"), - Ty::Dyn(predicates) => { - let where_clauses = predicates.iter().cloned().map(|p| p.to_chalk(db)).collect(); - chalk_ir::TyData::Dyn(make_binders(where_clauses, 1)).intern() - } - Ty::Opaque(predicates) => { - let where_clauses = predicates.iter().cloned().map(|p| p.to_chalk(db)).collect(); - chalk_ir::TyData::Opaque(make_binders(where_clauses, 1)).intern() - } - Ty::Unknown => { - let parameters = Vec::new(); - let name = TypeName::Error; - chalk_ir::ApplicationTy { name, parameters }.cast().intern() - } - } - } - fn from_chalk(db: &impl HirDatabase, chalk: chalk_ir::Ty) -> Self { - match chalk.data().clone() { - chalk_ir::TyData::Apply(apply_ty) => { - // FIXME this is kind of hacky due to the fact that - // TypeName::Placeholder is a Ty::Param on our side - match apply_ty.name { - TypeName::TypeKindId(TypeKindId::StructId(struct_id)) => { - let ctor = from_chalk(db, struct_id); - let parameters = from_chalk(db, apply_ty.parameters); - Ty::Apply(ApplicationTy { ctor, parameters }) - } - TypeName::AssociatedType(type_id) => { - let ctor = TypeCtor::AssociatedType(from_chalk(db, type_id)); - let parameters = from_chalk(db, apply_ty.parameters); - Ty::Apply(ApplicationTy { ctor, parameters }) - } - TypeName::Error => Ty::Unknown, - // FIXME handle TypeKindId::Trait/Type here - TypeName::TypeKindId(_) => unimplemented!(), - TypeName::Placeholder(idx) => { - assert_eq!(idx.ui, UniverseIndex::ROOT); - Ty::Param { idx: idx.idx as u32, name: crate::Name::missing() } - } - } - } - chalk_ir::TyData::Projection(proj) => { - let associated_ty = from_chalk(db, proj.associated_ty_id); - let parameters = from_chalk(db, proj.parameters); - Ty::Projection(ProjectionTy { associated_ty, parameters }) - } - chalk_ir::TyData::ForAll(_) => unimplemented!(), - chalk_ir::TyData::BoundVar(idx) => Ty::Bound(idx as u32), - chalk_ir::TyData::InferenceVar(_iv) => Ty::Unknown, - chalk_ir::TyData::Dyn(where_clauses) => { - assert_eq!(where_clauses.binders.len(), 1); - let predicates = - where_clauses.value.into_iter().map(|c| from_chalk(db, c)).collect(); - Ty::Dyn(predicates) - } - chalk_ir::TyData::Opaque(where_clauses) => { - assert_eq!(where_clauses.binders.len(), 1); - let predicates = - where_clauses.value.into_iter().map(|c| from_chalk(db, c)).collect(); - Ty::Opaque(predicates) - } - } - } -} - -impl ToChalk for Substs { - type Chalk = Vec>; - - fn to_chalk(self, db: &impl HirDatabase) -> Vec> { - self.iter().map(|ty| ty.clone().to_chalk(db).cast()).collect() - } - - fn from_chalk(db: &impl HirDatabase, parameters: Vec>) -> Substs { - let tys = parameters - .into_iter() - .map(|p| match p { - chalk_ir::Parameter(chalk_ir::ParameterKind::Ty(ty)) => from_chalk(db, ty), - chalk_ir::Parameter(chalk_ir::ParameterKind::Lifetime(_)) => unimplemented!(), - }) - .collect(); - Substs(tys) - } -} - -impl ToChalk for TraitRef { - type Chalk = chalk_ir::TraitRef; - - fn to_chalk(self: TraitRef, db: &impl HirDatabase) -> chalk_ir::TraitRef { - let trait_id = self.trait_.to_chalk(db); - let parameters = self.substs.to_chalk(db); - chalk_ir::TraitRef { trait_id, parameters } - } - - fn from_chalk(db: &impl HirDatabase, trait_ref: chalk_ir::TraitRef) -> Self { - let trait_ = from_chalk(db, trait_ref.trait_id); - let substs = from_chalk(db, trait_ref.parameters); - TraitRef { trait_, substs } - } -} - -impl ToChalk for TraitId { - type Chalk = chalk_ir::TraitId; - - fn to_chalk(self, _db: &impl HirDatabase) -> chalk_ir::TraitId { - chalk_ir::TraitId(id_to_chalk(self)) - } - - fn from_chalk(_db: &impl HirDatabase, trait_id: chalk_ir::TraitId) -> TraitId { - id_from_chalk(trait_id.0) - } -} - -impl ToChalk for TypeCtor { - type Chalk = chalk_ir::StructId; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::StructId { - db.intern_type_ctor(self).into() - } - - fn from_chalk(db: &impl HirDatabase, struct_id: chalk_ir::StructId) -> TypeCtor { - db.lookup_intern_type_ctor(struct_id.into()) - } -} - -impl ToChalk for Impl { - type Chalk = chalk_ir::ImplId; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::ImplId { - db.intern_chalk_impl(self).into() - } - - fn from_chalk(db: &impl HirDatabase, impl_id: chalk_ir::ImplId) -> Impl { - db.lookup_intern_chalk_impl(impl_id.into()) - } -} - -impl ToChalk for TypeAliasId { - type Chalk = chalk_ir::TypeId; - - fn to_chalk(self, _db: &impl HirDatabase) -> chalk_ir::TypeId { - chalk_ir::TypeId(id_to_chalk(self)) - } - - fn from_chalk(_db: &impl HirDatabase, type_alias_id: chalk_ir::TypeId) -> TypeAliasId { - id_from_chalk(type_alias_id.0) - } -} - -impl ToChalk for AssocTyValue { - type Chalk = chalk_rust_ir::AssociatedTyValueId; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_rust_ir::AssociatedTyValueId { - db.intern_assoc_ty_value(self).into() - } - - fn from_chalk( - db: &impl HirDatabase, - assoc_ty_value_id: chalk_rust_ir::AssociatedTyValueId, - ) -> AssocTyValue { - db.lookup_intern_assoc_ty_value(assoc_ty_value_id.into()) - } -} - -impl ToChalk for GenericPredicate { - type Chalk = chalk_ir::QuantifiedWhereClause; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::QuantifiedWhereClause { - match self { - GenericPredicate::Implemented(trait_ref) => { - make_binders(chalk_ir::WhereClause::Implemented(trait_ref.to_chalk(db)), 0) - } - GenericPredicate::Projection(projection_pred) => make_binders( - chalk_ir::WhereClause::ProjectionEq(chalk_ir::ProjectionEq { - projection: projection_pred.projection_ty.to_chalk(db), - ty: projection_pred.ty.to_chalk(db), - }), - 0, - ), - GenericPredicate::Error => { - let impossible_trait_ref = chalk_ir::TraitRef { - trait_id: UNKNOWN_TRAIT, - parameters: vec![Ty::Unknown.to_chalk(db).cast()], - }; - make_binders(chalk_ir::WhereClause::Implemented(impossible_trait_ref), 0) - } - } - } - - fn from_chalk( - db: &impl HirDatabase, - where_clause: chalk_ir::QuantifiedWhereClause, - ) -> GenericPredicate { - match where_clause.value { - chalk_ir::WhereClause::Implemented(tr) => { - if tr.trait_id == UNKNOWN_TRAIT { - // FIXME we need an Error enum on the Chalk side to avoid this - return GenericPredicate::Error; - } - GenericPredicate::Implemented(from_chalk(db, tr)) - } - chalk_ir::WhereClause::ProjectionEq(projection_eq) => { - let projection_ty = from_chalk(db, projection_eq.projection); - let ty = from_chalk(db, projection_eq.ty); - GenericPredicate::Projection(super::ProjectionPredicate { projection_ty, ty }) - } - } - } -} - -impl ToChalk for ProjectionTy { - type Chalk = chalk_ir::ProjectionTy; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::ProjectionTy { - chalk_ir::ProjectionTy { - associated_ty_id: self.associated_ty.to_chalk(db), - parameters: self.parameters.to_chalk(db), - } - } - - fn from_chalk( - db: &impl HirDatabase, - projection_ty: chalk_ir::ProjectionTy, - ) -> ProjectionTy { - ProjectionTy { - associated_ty: from_chalk(db, projection_ty.associated_ty_id), - parameters: from_chalk(db, projection_ty.parameters), - } - } -} - -impl ToChalk for super::ProjectionPredicate { - type Chalk = chalk_ir::Normalize; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Normalize { - chalk_ir::Normalize { - projection: self.projection_ty.to_chalk(db), - ty: self.ty.to_chalk(db), - } - } - - fn from_chalk(_db: &impl HirDatabase, _normalize: chalk_ir::Normalize) -> Self { - unimplemented!() - } -} - -impl ToChalk for Obligation { - type Chalk = chalk_ir::DomainGoal; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::DomainGoal { - match self { - Obligation::Trait(tr) => tr.to_chalk(db).cast(), - Obligation::Projection(pr) => pr.to_chalk(db).cast(), - } - } - - fn from_chalk(_db: &impl HirDatabase, _goal: chalk_ir::DomainGoal) -> Self { - unimplemented!() - } -} - -impl ToChalk for Canonical -where - T: ToChalk, -{ - type Chalk = chalk_ir::Canonical; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Canonical { - let parameter = chalk_ir::ParameterKind::Ty(chalk_ir::UniverseIndex::ROOT); - let value = self.value.to_chalk(db); - let canonical = chalk_ir::Canonical { value, binders: vec![parameter; self.num_vars] }; - canonical - } - - fn from_chalk(db: &impl HirDatabase, canonical: chalk_ir::Canonical) -> Canonical { - Canonical { num_vars: canonical.binders.len(), value: from_chalk(db, canonical.value) } - } -} - -impl ToChalk for Arc { - type Chalk = chalk_ir::Environment; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Environment { - let mut clauses = Vec::new(); - for pred in &self.predicates { - if pred.is_error() { - // for env, we just ignore errors - continue; - } - let program_clause: chalk_ir::ProgramClause = pred.clone().to_chalk(db).cast(); - clauses.push(program_clause.into_from_env_clause()); - } - chalk_ir::Environment::new().add_clauses(clauses) - } - - fn from_chalk( - _db: &impl HirDatabase, - _env: chalk_ir::Environment, - ) -> Arc { - unimplemented!() - } -} - -impl ToChalk for super::InEnvironment -where - T::Chalk: chalk_ir::family::HasTypeFamily, -{ - type Chalk = chalk_ir::InEnvironment; - - fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::InEnvironment { - chalk_ir::InEnvironment { - environment: self.environment.to_chalk(db), - goal: self.value.to_chalk(db), - } - } - - fn from_chalk( - db: &impl HirDatabase, - in_env: chalk_ir::InEnvironment, - ) -> super::InEnvironment { - super::InEnvironment { - environment: from_chalk(db, in_env.environment), - value: from_chalk(db, in_env.goal), - } - } -} - -fn make_binders(value: T, num_vars: usize) -> chalk_ir::Binders { - chalk_ir::Binders { - value, - binders: std::iter::repeat(chalk_ir::ParameterKind::Ty(())).take(num_vars).collect(), - } -} - -fn convert_where_clauses( - db: &impl HirDatabase, - def: GenericDefId, - substs: &Substs, -) -> Vec> { - let generic_predicates = db.generic_predicates(def); - let mut result = Vec::with_capacity(generic_predicates.len()); - for pred in generic_predicates.iter() { - if pred.is_error() { - // HACK: Return just the single predicate (which is always false - // anyway), otherwise Chalk can easily get into slow situations - return vec![pred.clone().subst(substs).to_chalk(db)]; - } - result.push(pred.clone().subst(substs).to_chalk(db)); - } - result -} - -impl<'a, DB> chalk_solve::RustIrDatabase for ChalkContext<'a, DB> -where - DB: HirDatabase, -{ - fn associated_ty_data(&self, id: TypeId) -> Arc> { - self.db.associated_ty_data(id) - } - fn trait_datum(&self, trait_id: chalk_ir::TraitId) -> Arc> { - self.db.trait_datum(self.krate, trait_id) - } - fn struct_datum(&self, struct_id: chalk_ir::StructId) -> Arc> { - self.db.struct_datum(self.krate, struct_id) - } - fn impl_datum(&self, impl_id: chalk_ir::ImplId) -> Arc> { - self.db.impl_datum(self.krate, impl_id) - } - fn impls_for_trait( - &self, - trait_id: chalk_ir::TraitId, - parameters: &[Parameter], - ) -> Vec { - debug!("impls_for_trait {:?}", trait_id); - if trait_id == UNKNOWN_TRAIT { - return Vec::new(); - } - let trait_: TraitId = from_chalk(self.db, trait_id); - let mut result: Vec<_> = self - .db - .impls_for_trait(self.krate, trait_.into()) - .iter() - .copied() - .map(|it| Impl::ImplBlock(it.into())) - .map(|impl_| impl_.to_chalk(self.db)) - .collect(); - - let ty: Ty = from_chalk(self.db, parameters[0].assert_ty_ref().clone()); - if let Ty::Apply(ApplicationTy { ctor: TypeCtor::Closure { def, expr }, .. }) = ty { - for &fn_trait in - [super::FnTrait::FnOnce, super::FnTrait::FnMut, super::FnTrait::Fn].iter() - { - if let Some(actual_trait) = get_fn_trait(self.db, self.krate, fn_trait) { - if trait_ == actual_trait { - let impl_ = super::ClosureFnTraitImplData { def, expr, fn_trait }; - result.push(Impl::ClosureFnTraitImpl(impl_).to_chalk(self.db)); - } - } - } - } - - debug!("impls_for_trait returned {} impls", result.len()); - result - } - fn impl_provided_for( - &self, - auto_trait_id: chalk_ir::TraitId, - struct_id: chalk_ir::StructId, - ) -> bool { - debug!("impl_provided_for {:?}, {:?}", auto_trait_id, struct_id); - false // FIXME - } - fn type_name(&self, _id: TypeKindId) -> Identifier { - unimplemented!() - } - fn associated_ty_value( - &self, - id: chalk_rust_ir::AssociatedTyValueId, - ) -> Arc> { - self.db.associated_ty_value(self.krate.into(), id) - } - fn custom_clauses(&self) -> Vec> { - vec![] - } - fn local_impls_to_coherence_check( - &self, - _trait_id: chalk_ir::TraitId, - ) -> Vec { - // We don't do coherence checking (yet) - unimplemented!() - } -} - -pub(crate) fn associated_ty_data_query( - db: &impl HirDatabase, - id: TypeId, -) -> Arc> { - debug!("associated_ty_data {:?}", id); - let type_alias: TypeAliasId = from_chalk(db, id); - let trait_ = match type_alias.lookup(db).container { - ContainerId::TraitId(t) => t, - _ => panic!("associated type not in trait"), - }; - let generic_params = db.generic_params(type_alias.into()); - let bound_data = chalk_rust_ir::AssociatedTyDatumBound { - // FIXME add bounds and where clauses - bounds: vec![], - where_clauses: vec![], - }; - let datum = AssociatedTyDatum { - trait_id: trait_.to_chalk(db), - id, - name: lalrpop_intern::intern(&db.type_alias_data(type_alias).name.to_string()), - binders: make_binders(bound_data, generic_params.count_params_including_parent()), - }; - Arc::new(datum) -} - -pub(crate) fn trait_datum_query( - db: &impl HirDatabase, - krate: CrateId, - trait_id: chalk_ir::TraitId, -) -> Arc> { - debug!("trait_datum {:?}", trait_id); - if trait_id == UNKNOWN_TRAIT { - let trait_datum_bound = chalk_rust_ir::TraitDatumBound { where_clauses: Vec::new() }; - - let flags = chalk_rust_ir::TraitFlags { - auto: false, - marker: false, - upstream: true, - fundamental: false, - non_enumerable: true, - coinductive: false, - }; - return Arc::new(TraitDatum { - id: trait_id, - binders: make_binders(trait_datum_bound, 1), - flags, - associated_ty_ids: vec![], - }); - } - let trait_: TraitId = from_chalk(db, trait_id); - let trait_data = db.trait_data(trait_); - debug!("trait {:?} = {:?}", trait_id, trait_data.name); - let generic_params = db.generic_params(trait_.into()); - let bound_vars = Substs::bound_vars(&generic_params); - let flags = chalk_rust_ir::TraitFlags { - auto: trait_data.auto, - upstream: trait_.module(db).krate != krate, - non_enumerable: true, - coinductive: false, // only relevant for Chalk testing - // FIXME set these flags correctly - marker: false, - fundamental: false, - }; - let where_clauses = convert_where_clauses(db, trait_.into(), &bound_vars); - let associated_ty_ids = - trait_data.associated_types().map(|type_alias| type_alias.to_chalk(db)).collect(); - let trait_datum_bound = chalk_rust_ir::TraitDatumBound { where_clauses }; - let trait_datum = TraitDatum { - id: trait_id, - binders: make_binders(trait_datum_bound, bound_vars.len()), - flags, - associated_ty_ids, - }; - Arc::new(trait_datum) -} - -pub(crate) fn struct_datum_query( - db: &impl HirDatabase, - krate: CrateId, - struct_id: chalk_ir::StructId, -) -> Arc> { - debug!("struct_datum {:?}", struct_id); - let type_ctor: TypeCtor = from_chalk(db, struct_id); - debug!("struct {:?} = {:?}", struct_id, type_ctor); - let num_params = type_ctor.num_ty_params(db); - let upstream = type_ctor.krate(db) != Some(krate); - let where_clauses = type_ctor - .as_generic_def() - .map(|generic_def| { - let generic_params = db.generic_params(generic_def.into()); - let bound_vars = Substs::bound_vars(&generic_params); - convert_where_clauses(db, generic_def, &bound_vars) - }) - .unwrap_or_else(Vec::new); - let flags = chalk_rust_ir::StructFlags { - upstream, - // FIXME set fundamental flag correctly - fundamental: false, - }; - let struct_datum_bound = chalk_rust_ir::StructDatumBound { - fields: Vec::new(), // FIXME add fields (only relevant for auto traits) - where_clauses, - }; - let struct_datum = - StructDatum { id: struct_id, binders: make_binders(struct_datum_bound, num_params), flags }; - Arc::new(struct_datum) -} - -pub(crate) fn impl_datum_query( - db: &impl HirDatabase, - krate: CrateId, - impl_id: chalk_ir::ImplId, -) -> Arc> { - let _p = ra_prof::profile("impl_datum"); - debug!("impl_datum {:?}", impl_id); - let impl_: Impl = from_chalk(db, impl_id); - match impl_ { - Impl::ImplBlock(impl_block) => impl_block_datum(db, krate, impl_id, impl_block), - Impl::ClosureFnTraitImpl(data) => closure_fn_trait_impl_datum(db, krate, data), - } - .unwrap_or_else(invalid_impl_datum) -} - -fn impl_block_datum( - db: &impl HirDatabase, - krate: CrateId, - chalk_id: chalk_ir::ImplId, - impl_id: ImplId, -) -> Option>> { - let impl_data = db.impl_data(impl_id); - let resolver = impl_id.resolver(db); - let target_ty = Ty::from_hir(db, &resolver, &impl_data.target_type); - - // `CoerseUnsized` has one generic parameter for the target type. - let trait_ref = - TraitRef::from_hir(db, &resolver, impl_data.target_trait.as_ref()?, Some(target_ty))?; - - let generic_params = db.generic_params(impl_id.into()); - let bound_vars = Substs::bound_vars(&generic_params); - let trait_ref = trait_ref.subst(&bound_vars); - let trait_ = trait_ref.trait_; - let impl_type = if impl_id.module(db).krate == krate { - chalk_rust_ir::ImplType::Local - } else { - chalk_rust_ir::ImplType::External - }; - let where_clauses = convert_where_clauses(db, impl_id.into(), &bound_vars); - let negative = impl_data.is_negative; - debug!( - "impl {:?}: {}{} where {:?}", - chalk_id, - if negative { "!" } else { "" }, - trait_ref.display(db), - where_clauses - ); - let trait_ref = trait_ref.to_chalk(db); - - let polarity = if negative { - chalk_rust_ir::Polarity::Negative - } else { - chalk_rust_ir::Polarity::Positive - }; - - let impl_datum_bound = chalk_rust_ir::ImplDatumBound { trait_ref, where_clauses }; - let trait_data = db.trait_data(trait_); - let associated_ty_value_ids = impl_data - .items - .iter() - .filter_map(|item| match item { - AssocItemId::TypeAliasId(type_alias) => Some(*type_alias), - _ => None, - }) - .filter(|&type_alias| { - // don't include associated types that don't exist in the trait - let name = &db.type_alias_data(type_alias).name; - trait_data.associated_type_by_name(name).is_some() - }) - .map(|type_alias| AssocTyValue::TypeAlias(type_alias).to_chalk(db)) - .collect(); - debug!("impl_datum: {:?}", impl_datum_bound); - let impl_datum = ImplDatum { - binders: make_binders(impl_datum_bound, bound_vars.len()), - impl_type, - polarity, - associated_ty_value_ids, - }; - Some(Arc::new(impl_datum)) -} - -fn invalid_impl_datum() -> Arc> { - let trait_ref = chalk_ir::TraitRef { - trait_id: UNKNOWN_TRAIT, - parameters: vec![chalk_ir::TyData::BoundVar(0).cast().intern().cast()], - }; - let impl_datum_bound = chalk_rust_ir::ImplDatumBound { trait_ref, where_clauses: Vec::new() }; - let impl_datum = ImplDatum { - binders: make_binders(impl_datum_bound, 1), - impl_type: chalk_rust_ir::ImplType::External, - polarity: chalk_rust_ir::Polarity::Positive, - associated_ty_value_ids: Vec::new(), - }; - Arc::new(impl_datum) -} - -fn closure_fn_trait_impl_datum( - db: &impl HirDatabase, - krate: CrateId, - data: super::ClosureFnTraitImplData, -) -> Option>> { - // for some closure |X, Y| -> Z: - // impl Fn<(T, U)> for closure V> { Output = V } - - let trait_ = get_fn_trait(db, krate, data.fn_trait)?; // get corresponding fn trait - - // validate FnOnce trait, since we need it in the assoc ty value definition - // and don't want to return a valid value only to find out later that FnOnce - // is broken - let fn_once_trait = get_fn_trait(db, krate, super::FnTrait::FnOnce)?; - let _output = db.trait_data(fn_once_trait).associated_type_by_name(&name::OUTPUT_TYPE)?; - - let num_args: u16 = match &db.body(data.def.into())[data.expr] { - crate::expr::Expr::Lambda { args, .. } => args.len() as u16, - _ => { - log::warn!("closure for closure type {:?} not found", data); - 0 - } - }; - - let arg_ty = Ty::apply( - TypeCtor::Tuple { cardinality: num_args }, - Substs::builder(num_args as usize).fill_with_bound_vars(0).build(), - ); - let sig_ty = Ty::apply( - TypeCtor::FnPtr { num_args }, - Substs::builder(num_args as usize + 1).fill_with_bound_vars(0).build(), - ); - - let self_ty = Ty::apply_one(TypeCtor::Closure { def: data.def, expr: data.expr }, sig_ty); - - let trait_ref = TraitRef { - trait_: trait_.into(), - substs: Substs::build_for_def(db, trait_).push(self_ty).push(arg_ty).build(), - }; - - let output_ty_id = AssocTyValue::ClosureFnTraitImplOutput(data.clone()).to_chalk(db); - - let impl_type = chalk_rust_ir::ImplType::External; - - let impl_datum_bound = chalk_rust_ir::ImplDatumBound { - trait_ref: trait_ref.to_chalk(db), - where_clauses: Vec::new(), - }; - let impl_datum = ImplDatum { - binders: make_binders(impl_datum_bound, num_args as usize + 1), - impl_type, - polarity: chalk_rust_ir::Polarity::Positive, - associated_ty_value_ids: vec![output_ty_id], - }; - Some(Arc::new(impl_datum)) -} - -pub(crate) fn associated_ty_value_query( - db: &impl HirDatabase, - krate: CrateId, - id: chalk_rust_ir::AssociatedTyValueId, -) -> Arc> { - let data: AssocTyValue = from_chalk(db, id); - match data { - AssocTyValue::TypeAlias(type_alias) => { - type_alias_associated_ty_value(db, krate, type_alias) - } - AssocTyValue::ClosureFnTraitImplOutput(data) => { - closure_fn_trait_output_assoc_ty_value(db, krate, data) - } - } -} - -fn type_alias_associated_ty_value( - db: &impl HirDatabase, - _krate: CrateId, - type_alias: TypeAliasId, -) -> Arc> { - let type_alias_data = db.type_alias_data(type_alias); - let impl_id = match type_alias.lookup(db).container { - ContainerId::ImplId(it) => it, - _ => panic!("assoc ty value should be in impl"), - }; - - let impl_data = db.impl_data(impl_id); - let resolver = impl_id.resolver(db); - let target_ty = Ty::from_hir(db, &resolver, &impl_data.target_type); - let target_trait = impl_data - .target_trait - .as_ref() - .and_then(|trait_ref| TraitRef::from_hir(db, &resolver, &trait_ref, Some(target_ty))) - .expect("assoc ty value should not exist"); // we don't return any assoc ty values if the impl'd trait can't be resolved - - let assoc_ty = db - .trait_data(target_trait.trait_) - .associated_type_by_name(&type_alias_data.name) - .expect("assoc ty value should not exist"); // validated when building the impl data as well - let generic_params = db.generic_params(impl_id.into()); - let bound_vars = Substs::bound_vars(&generic_params); - let ty = db.ty(type_alias.into()).subst(&bound_vars); - let value_bound = chalk_rust_ir::AssociatedTyValueBound { ty: ty.to_chalk(db) }; - let value = chalk_rust_ir::AssociatedTyValue { - impl_id: Impl::ImplBlock(impl_id.into()).to_chalk(db), - associated_ty_id: assoc_ty.to_chalk(db), - value: make_binders(value_bound, bound_vars.len()), - }; - Arc::new(value) -} - -fn closure_fn_trait_output_assoc_ty_value( - db: &impl HirDatabase, - krate: CrateId, - data: super::ClosureFnTraitImplData, -) -> Arc> { - let impl_id = Impl::ClosureFnTraitImpl(data.clone()).to_chalk(db); - - let num_args: u16 = match &db.body(data.def.into())[data.expr] { - crate::expr::Expr::Lambda { args, .. } => args.len() as u16, - _ => { - log::warn!("closure for closure type {:?} not found", data); - 0 - } - }; - - let output_ty = Ty::Bound(num_args.into()); - - let fn_once_trait = - get_fn_trait(db, krate, super::FnTrait::FnOnce).expect("assoc ty value should not exist"); - - let output_ty_id = db - .trait_data(fn_once_trait) - .associated_type_by_name(&name::OUTPUT_TYPE) - .expect("assoc ty value should not exist"); - - let value_bound = chalk_rust_ir::AssociatedTyValueBound { ty: output_ty.to_chalk(db) }; - - let value = chalk_rust_ir::AssociatedTyValue { - associated_ty_id: output_ty_id.to_chalk(db), - impl_id, - value: make_binders(value_bound, num_args as usize + 1), - }; - Arc::new(value) -} - -fn get_fn_trait( - db: &impl HirDatabase, - krate: CrateId, - fn_trait: super::FnTrait, -) -> Option { - let target = db.lang_item(krate, fn_trait.lang_item_name().into())?; - match target { - LangItemTarget::TraitId(t) => Some(t), - _ => None, - } -} - -fn id_from_chalk(chalk_id: chalk_ir::RawId) -> T { - T::from_intern_id(InternId::from(chalk_id.index)) -} -fn id_to_chalk(salsa_id: T) -> chalk_ir::RawId { - chalk_ir::RawId { index: salsa_id.as_intern_id().as_u32() } -} - -impl From for crate::ty::TypeCtorId { - fn from(struct_id: chalk_ir::StructId) -> Self { - id_from_chalk(struct_id.0) - } -} - -impl From for chalk_ir::StructId { - fn from(type_ctor_id: crate::ty::TypeCtorId) -> Self { - chalk_ir::StructId(id_to_chalk(type_ctor_id)) - } -} - -impl From for crate::ty::traits::GlobalImplId { - fn from(impl_id: chalk_ir::ImplId) -> Self { - id_from_chalk(impl_id.0) - } -} - -impl From for chalk_ir::ImplId { - fn from(impl_id: crate::ty::traits::GlobalImplId) -> Self { - chalk_ir::ImplId(id_to_chalk(impl_id)) - } -} - -impl From for crate::ty::traits::AssocTyValueId { - fn from(id: chalk_rust_ir::AssociatedTyValueId) -> Self { - id_from_chalk(id.0) - } -} - -impl From for chalk_rust_ir::AssociatedTyValueId { - fn from(assoc_ty_value_id: crate::ty::traits::AssocTyValueId) -> Self { - chalk_rust_ir::AssociatedTyValueId(id_to_chalk(assoc_ty_value_id)) - } -} -- cgit v1.2.3