| //! The implementation of `RustIrDatabase` for Chalk, which provides information |
| //! about the code that Chalk needs. |
| use core::ops; |
| use std::{iter, sync::Arc}; |
| |
| use tracing::debug; |
| |
| use chalk_ir::{cast::Caster, fold::shift::Shift, CanonicalVarKinds}; |
| use chalk_solve::rust_ir::{self, OpaqueTyDatumBound, WellKnownTrait}; |
| |
| use base_db::CrateId; |
| use hir_def::{ |
| hir::Movability, |
| lang_item::{LangItem, LangItemTarget}, |
| AssocItemId, BlockId, GenericDefId, HasModule, ItemContainerId, Lookup, TypeAliasId, |
| }; |
| use hir_expand::name::name; |
| |
| use crate::{ |
| db::HirDatabase, |
| display::HirDisplay, |
| from_assoc_type_id, from_chalk_trait_id, from_foreign_def_id, make_binders, |
| make_single_type_binders, |
| mapping::{from_chalk, ToChalk, TypeAliasAsValue}, |
| method_resolution::{TraitImpls, TyFingerprint, ALL_FLOAT_FPS, ALL_INT_FPS}, |
| to_assoc_type_id, to_chalk_trait_id, |
| traits::ChalkContext, |
| utils::{generics, ClosureSubst}, |
| wrap_empty_binders, AliasEq, AliasTy, BoundVar, CallableDefId, DebruijnIndex, FnDefId, |
| Interner, ProjectionTy, ProjectionTyExt, QuantifiedWhereClause, Substitution, TraitRef, |
| TraitRefExt, Ty, TyBuilder, TyExt, TyKind, WhereClause, |
| }; |
| |
| pub(crate) type AssociatedTyDatum = chalk_solve::rust_ir::AssociatedTyDatum<Interner>; |
| pub(crate) type TraitDatum = chalk_solve::rust_ir::TraitDatum<Interner>; |
| pub(crate) type StructDatum = chalk_solve::rust_ir::AdtDatum<Interner>; |
| pub(crate) type ImplDatum = chalk_solve::rust_ir::ImplDatum<Interner>; |
| pub(crate) type OpaqueTyDatum = chalk_solve::rust_ir::OpaqueTyDatum<Interner>; |
| |
| pub(crate) type AssocTypeId = chalk_ir::AssocTypeId<Interner>; |
| pub(crate) type TraitId = chalk_ir::TraitId<Interner>; |
| pub(crate) type AdtId = chalk_ir::AdtId<Interner>; |
| pub(crate) type ImplId = chalk_ir::ImplId<Interner>; |
| pub(crate) type AssociatedTyValueId = chalk_solve::rust_ir::AssociatedTyValueId<Interner>; |
| pub(crate) type AssociatedTyValue = chalk_solve::rust_ir::AssociatedTyValue<Interner>; |
| pub(crate) type FnDefDatum = chalk_solve::rust_ir::FnDefDatum<Interner>; |
| pub(crate) type Variances = chalk_ir::Variances<Interner>; |
| |
| impl chalk_solve::RustIrDatabase<Interner> for ChalkContext<'_> { |
| fn associated_ty_data(&self, id: AssocTypeId) -> Arc<AssociatedTyDatum> { |
| self.db.associated_ty_data(id) |
| } |
| fn trait_datum(&self, trait_id: TraitId) -> Arc<TraitDatum> { |
| self.db.trait_datum(self.krate, trait_id) |
| } |
| fn adt_datum(&self, struct_id: AdtId) -> Arc<StructDatum> { |
| self.db.struct_datum(self.krate, struct_id) |
| } |
| fn adt_repr(&self, _struct_id: AdtId) -> Arc<rust_ir::AdtRepr<Interner>> { |
| // FIXME: keep track of these |
| Arc::new(rust_ir::AdtRepr { c: false, packed: false, int: None }) |
| } |
| fn discriminant_type(&self, ty: chalk_ir::Ty<Interner>) -> chalk_ir::Ty<Interner> { |
| if let chalk_ir::TyKind::Adt(id, _) = ty.kind(Interner) { |
| if let hir_def::AdtId::EnumId(e) = id.0 { |
| let enum_data = self.db.enum_data(e); |
| let ty = enum_data.repr.unwrap_or_default().discr_type(); |
| return chalk_ir::TyKind::Scalar(match ty { |
| hir_def::layout::IntegerType::Pointer(is_signed) => match is_signed { |
| true => chalk_ir::Scalar::Int(chalk_ir::IntTy::Isize), |
| false => chalk_ir::Scalar::Uint(chalk_ir::UintTy::Usize), |
| }, |
| hir_def::layout::IntegerType::Fixed(size, is_signed) => match is_signed { |
| true => chalk_ir::Scalar::Int(match size { |
| hir_def::layout::Integer::I8 => chalk_ir::IntTy::I8, |
| hir_def::layout::Integer::I16 => chalk_ir::IntTy::I16, |
| hir_def::layout::Integer::I32 => chalk_ir::IntTy::I32, |
| hir_def::layout::Integer::I64 => chalk_ir::IntTy::I64, |
| hir_def::layout::Integer::I128 => chalk_ir::IntTy::I128, |
| }), |
| false => chalk_ir::Scalar::Uint(match size { |
| hir_def::layout::Integer::I8 => chalk_ir::UintTy::U8, |
| hir_def::layout::Integer::I16 => chalk_ir::UintTy::U16, |
| hir_def::layout::Integer::I32 => chalk_ir::UintTy::U32, |
| hir_def::layout::Integer::I64 => chalk_ir::UintTy::U64, |
| hir_def::layout::Integer::I128 => chalk_ir::UintTy::U128, |
| }), |
| }, |
| }) |
| .intern(Interner); |
| } |
| } |
| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Uint(chalk_ir::UintTy::U8)).intern(Interner) |
| } |
| fn impl_datum(&self, impl_id: ImplId) -> Arc<ImplDatum> { |
| self.db.impl_datum(self.krate, impl_id) |
| } |
| |
| fn fn_def_datum( |
| &self, |
| fn_def_id: chalk_ir::FnDefId<Interner>, |
| ) -> Arc<rust_ir::FnDefDatum<Interner>> { |
| self.db.fn_def_datum(self.krate, fn_def_id) |
| } |
| |
| fn impls_for_trait( |
| &self, |
| trait_id: TraitId, |
| parameters: &[chalk_ir::GenericArg<Interner>], |
| binders: &CanonicalVarKinds<Interner>, |
| ) -> Vec<ImplId> { |
| debug!("impls_for_trait {:?}", trait_id); |
| let trait_: hir_def::TraitId = from_chalk_trait_id(trait_id); |
| |
| let ty: Ty = parameters[0].assert_ty_ref(Interner).clone(); |
| |
| fn binder_kind( |
| ty: &Ty, |
| binders: &CanonicalVarKinds<Interner>, |
| ) -> Option<chalk_ir::TyVariableKind> { |
| if let TyKind::BoundVar(bv) = ty.kind(Interner) { |
| let binders = binders.as_slice(Interner); |
| if bv.debruijn == DebruijnIndex::INNERMOST { |
| if let chalk_ir::VariableKind::Ty(tk) = binders[bv.index].kind { |
| return Some(tk); |
| } |
| } |
| } |
| None |
| } |
| |
| let self_ty_fp = TyFingerprint::for_trait_impl(&ty); |
| let fps: &[TyFingerprint] = match binder_kind(&ty, binders) { |
| Some(chalk_ir::TyVariableKind::Integer) => &ALL_INT_FPS, |
| Some(chalk_ir::TyVariableKind::Float) => &ALL_FLOAT_FPS, |
| _ => self_ty_fp.as_ref().map(std::slice::from_ref).unwrap_or(&[]), |
| }; |
| |
| let trait_module = trait_.module(self.db.upcast()); |
| let type_module = match self_ty_fp { |
| Some(TyFingerprint::Adt(adt_id)) => Some(adt_id.module(self.db.upcast())), |
| Some(TyFingerprint::ForeignType(type_id)) => { |
| Some(from_foreign_def_id(type_id).module(self.db.upcast())) |
| } |
| Some(TyFingerprint::Dyn(trait_id)) => Some(trait_id.module(self.db.upcast())), |
| _ => None, |
| }; |
| |
| let mut def_blocks = |
| [trait_module.containing_block(), type_module.and_then(|it| it.containing_block())]; |
| |
| // Note: Since we're using impls_for_trait, only impls where the trait |
| // can be resolved should ever reach Chalk. impl_datum relies on that |
| // and will panic if the trait can't be resolved. |
| let in_deps = self.db.trait_impls_in_deps(self.krate); |
| let in_self = self.db.trait_impls_in_crate(self.krate); |
| |
| let block_impls = iter::successors(self.block, |&block_id| { |
| cov_mark::hit!(block_local_impls); |
| self.db.block_def_map(block_id).parent().and_then(|module| module.containing_block()) |
| }) |
| .inspect(|&block_id| { |
| // make sure we don't search the same block twice |
| def_blocks.iter_mut().for_each(|block| { |
| if *block == Some(block_id) { |
| *block = None; |
| } |
| }); |
| }) |
| .filter_map(|block_id| self.db.trait_impls_in_block(block_id)); |
| |
| let id_to_chalk = |id: hir_def::ImplId| id.to_chalk(self.db); |
| let mut result = vec![]; |
| match fps { |
| [] => { |
| debug!("Unrestricted search for {:?} impls...", trait_); |
| let mut f = |impls: &TraitImpls| { |
| result.extend(impls.for_trait(trait_).map(id_to_chalk)); |
| }; |
| f(&in_self); |
| in_deps.iter().map(ops::Deref::deref).for_each(&mut f); |
| block_impls.for_each(|it| f(&it)); |
| def_blocks |
| .into_iter() |
| .flatten() |
| .filter_map(|it| self.db.trait_impls_in_block(it)) |
| .for_each(|it| f(&it)); |
| } |
| fps => { |
| let mut f = |
| |impls: &TraitImpls| { |
| result.extend(fps.iter().flat_map(|fp| { |
| impls.for_trait_and_self_ty(trait_, *fp).map(id_to_chalk) |
| })); |
| }; |
| f(&in_self); |
| in_deps.iter().map(ops::Deref::deref).for_each(&mut f); |
| block_impls.for_each(|it| f(&it)); |
| def_blocks |
| .into_iter() |
| .flatten() |
| .filter_map(|it| self.db.trait_impls_in_block(it)) |
| .for_each(|it| f(&it)); |
| } |
| } |
| |
| debug!("impls_for_trait returned {} impls", result.len()); |
| result |
| } |
| fn impl_provided_for(&self, auto_trait_id: TraitId, kind: &chalk_ir::TyKind<Interner>) -> bool { |
| debug!("impl_provided_for {:?}, {:?}", auto_trait_id, kind); |
| false // FIXME |
| } |
| fn associated_ty_value(&self, id: AssociatedTyValueId) -> Arc<AssociatedTyValue> { |
| self.db.associated_ty_value(self.krate, id) |
| } |
| |
| fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<Interner>> { |
| vec![] |
| } |
| fn local_impls_to_coherence_check(&self, _trait_id: TraitId) -> Vec<ImplId> { |
| // We don't do coherence checking (yet) |
| unimplemented!() |
| } |
| fn interner(&self) -> Interner { |
| Interner |
| } |
| fn well_known_trait_id( |
| &self, |
| well_known_trait: rust_ir::WellKnownTrait, |
| ) -> Option<chalk_ir::TraitId<Interner>> { |
| let lang_attr = lang_item_from_well_known_trait(well_known_trait); |
| let trait_ = match self.db.lang_item(self.krate, lang_attr) { |
| Some(LangItemTarget::Trait(trait_)) => trait_, |
| _ => return None, |
| }; |
| Some(to_chalk_trait_id(trait_)) |
| } |
| |
| fn program_clauses_for_env( |
| &self, |
| environment: &chalk_ir::Environment<Interner>, |
| ) -> chalk_ir::ProgramClauses<Interner> { |
| self.db.program_clauses_for_chalk_env(self.krate, self.block, environment.clone()) |
| } |
| |
| fn opaque_ty_data(&self, id: chalk_ir::OpaqueTyId<Interner>) -> Arc<OpaqueTyDatum> { |
| let full_id = self.db.lookup_intern_impl_trait_id(id.into()); |
| let bound = match full_id { |
| crate::ImplTraitId::ReturnTypeImplTrait(func, idx) => { |
| let datas = self |
| .db |
| .return_type_impl_traits(func) |
| .expect("impl trait id without impl traits"); |
| let (datas, binders) = (*datas).as_ref().into_value_and_skipped_binders(); |
| let data = &datas.impl_traits[idx]; |
| let bound = OpaqueTyDatumBound { |
| bounds: make_single_type_binders(data.bounds.skip_binders().to_vec()), |
| where_clauses: chalk_ir::Binders::empty(Interner, vec![]), |
| }; |
| chalk_ir::Binders::new(binders, bound) |
| } |
| crate::ImplTraitId::AsyncBlockTypeImplTrait(..) => { |
| if let Some((future_trait, future_output)) = self |
| .db |
| .lang_item(self.krate, LangItem::Future) |
| .and_then(|item| item.as_trait()) |
| .and_then(|trait_| { |
| let alias = |
| self.db.trait_data(trait_).associated_type_by_name(&name![Output])?; |
| Some((trait_, alias)) |
| }) |
| { |
| // Making up Symbol’s value as variable is void: AsyncBlock<T>: |
| // |
| // |--------------------OpaqueTyDatum-------------------| |
| // |-------------OpaqueTyDatumBound--------------| |
| // for<T> <Self> [Future<Self>, Future::Output<Self> = T] |
| // ^1 ^0 ^0 ^0 ^1 |
| let impl_bound = WhereClause::Implemented(TraitRef { |
| trait_id: to_chalk_trait_id(future_trait), |
| // Self type as the first parameter. |
| substitution: Substitution::from1( |
| Interner, |
| TyKind::BoundVar(BoundVar { |
| debruijn: DebruijnIndex::INNERMOST, |
| index: 0, |
| }) |
| .intern(Interner), |
| ), |
| }); |
| let mut binder = vec![]; |
| binder.push(crate::wrap_empty_binders(impl_bound)); |
| let sized_trait = self |
| .db |
| .lang_item(self.krate, LangItem::Sized) |
| .and_then(|item| item.as_trait()); |
| if let Some(sized_trait_) = sized_trait { |
| let sized_bound = WhereClause::Implemented(TraitRef { |
| trait_id: to_chalk_trait_id(sized_trait_), |
| // Self type as the first parameter. |
| substitution: Substitution::from1( |
| Interner, |
| TyKind::BoundVar(BoundVar { |
| debruijn: DebruijnIndex::INNERMOST, |
| index: 0, |
| }) |
| .intern(Interner), |
| ), |
| }); |
| binder.push(crate::wrap_empty_binders(sized_bound)); |
| } |
| let proj_bound = WhereClause::AliasEq(AliasEq { |
| alias: AliasTy::Projection(ProjectionTy { |
| associated_ty_id: to_assoc_type_id(future_output), |
| // Self type as the first parameter. |
| substitution: Substitution::from1( |
| Interner, |
| TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0)) |
| .intern(Interner), |
| ), |
| }), |
| // The parameter of the opaque type. |
| ty: TyKind::BoundVar(BoundVar { debruijn: DebruijnIndex::ONE, index: 0 }) |
| .intern(Interner), |
| }); |
| binder.push(crate::wrap_empty_binders(proj_bound)); |
| let bound = OpaqueTyDatumBound { |
| bounds: make_single_type_binders(binder), |
| where_clauses: chalk_ir::Binders::empty(Interner, vec![]), |
| }; |
| // The opaque type has 1 parameter. |
| make_single_type_binders(bound) |
| } else { |
| // If failed to find Symbol’s value as variable is void: Future::Output, return empty bounds as fallback. |
| let bound = OpaqueTyDatumBound { |
| bounds: chalk_ir::Binders::empty(Interner, vec![]), |
| where_clauses: chalk_ir::Binders::empty(Interner, vec![]), |
| }; |
| // The opaque type has 1 parameter. |
| make_single_type_binders(bound) |
| } |
| } |
| }; |
| |
| Arc::new(OpaqueTyDatum { opaque_ty_id: id, bound }) |
| } |
| |
| fn hidden_opaque_type(&self, _id: chalk_ir::OpaqueTyId<Interner>) -> chalk_ir::Ty<Interner> { |
| // FIXME: actually provide the hidden type; it is relevant for auto traits |
| TyKind::Error.intern(Interner) |
| } |
| |
| fn is_object_safe(&self, _trait_id: chalk_ir::TraitId<Interner>) -> bool { |
| // FIXME: implement actual object safety |
| true |
| } |
| |
| fn closure_kind( |
| &self, |
| _closure_id: chalk_ir::ClosureId<Interner>, |
| _substs: &chalk_ir::Substitution<Interner>, |
| ) -> rust_ir::ClosureKind { |
| // Fn is the closure kind that implements all three traits |
| rust_ir::ClosureKind::Fn |
| } |
| fn closure_inputs_and_output( |
| &self, |
| _closure_id: chalk_ir::ClosureId<Interner>, |
| substs: &chalk_ir::Substitution<Interner>, |
| ) -> chalk_ir::Binders<rust_ir::FnDefInputsAndOutputDatum<Interner>> { |
| let sig_ty = ClosureSubst(substs).sig_ty(); |
| let sig = &sig_ty.callable_sig(self.db).expect("first closure param should be fn ptr"); |
| let io = rust_ir::FnDefInputsAndOutputDatum { |
| argument_types: sig.params().to_vec(), |
| return_type: sig.ret().clone(), |
| }; |
| chalk_ir::Binders::empty(Interner, io.shifted_in(Interner)) |
| } |
| fn closure_upvars( |
| &self, |
| _closure_id: chalk_ir::ClosureId<Interner>, |
| _substs: &chalk_ir::Substitution<Interner>, |
| ) -> chalk_ir::Binders<chalk_ir::Ty<Interner>> { |
| let ty = TyBuilder::unit(); |
| chalk_ir::Binders::empty(Interner, ty) |
| } |
| fn closure_fn_substitution( |
| &self, |
| _closure_id: chalk_ir::ClosureId<Interner>, |
| _substs: &chalk_ir::Substitution<Interner>, |
| ) -> chalk_ir::Substitution<Interner> { |
| Substitution::empty(Interner) |
| } |
| |
| fn trait_name(&self, trait_id: chalk_ir::TraitId<Interner>) -> String { |
| let id = from_chalk_trait_id(trait_id); |
| self.db.trait_data(id).name.display(self.db.upcast()).to_string() |
| } |
| fn adt_name(&self, chalk_ir::AdtId(adt_id): AdtId) -> String { |
| match adt_id { |
| hir_def::AdtId::StructId(id) => { |
| self.db.struct_data(id).name.display(self.db.upcast()).to_string() |
| } |
| hir_def::AdtId::EnumId(id) => { |
| self.db.enum_data(id).name.display(self.db.upcast()).to_string() |
| } |
| hir_def::AdtId::UnionId(id) => { |
| self.db.union_data(id).name.display(self.db.upcast()).to_string() |
| } |
| } |
| } |
| fn adt_size_align(&self, _id: chalk_ir::AdtId<Interner>) -> Arc<rust_ir::AdtSizeAlign> { |
| // FIXME |
| Arc::new(rust_ir::AdtSizeAlign::from_one_zst(false)) |
| } |
| fn assoc_type_name(&self, assoc_ty_id: chalk_ir::AssocTypeId<Interner>) -> String { |
| let id = self.db.associated_ty_data(assoc_ty_id).name; |
| self.db.type_alias_data(id).name.display(self.db.upcast()).to_string() |
| } |
| fn opaque_type_name(&self, opaque_ty_id: chalk_ir::OpaqueTyId<Interner>) -> String { |
| format!("Opaque_{}", opaque_ty_id.0) |
| } |
| fn fn_def_name(&self, fn_def_id: chalk_ir::FnDefId<Interner>) -> String { |
| format!("fn_{}", fn_def_id.0) |
| } |
| fn coroutine_datum( |
| &self, |
| id: chalk_ir::CoroutineId<Interner>, |
| ) -> Arc<chalk_solve::rust_ir::CoroutineDatum<Interner>> { |
| let (parent, expr) = self.db.lookup_intern_coroutine(id.into()); |
| |
| // We fill substitution with unknown type, because we only need to know whether the generic |
| // params are types or consts to build `Binders` and those being filled up are for |
| // `resume_type`, `yield_type`, and `return_type` of the coroutine in question. |
| let subst = TyBuilder::subst_for_coroutine(self.db, parent).fill_with_unknown().build(); |
| |
| let input_output = rust_ir::CoroutineInputOutputDatum { |
| resume_type: TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0)) |
| .intern(Interner), |
| yield_type: TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 1)) |
| .intern(Interner), |
| return_type: TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 2)) |
| .intern(Interner), |
| // FIXME: calculate upvars |
| upvars: vec![], |
| }; |
| |
| let it = subst |
| .iter(Interner) |
| .map(|it| it.constant(Interner).map(|c| c.data(Interner).ty.clone())); |
| let input_output = crate::make_type_and_const_binders(it, input_output); |
| |
| let movability = match self.db.body(parent)[expr] { |
| hir_def::hir::Expr::Closure { |
| closure_kind: hir_def::hir::ClosureKind::Coroutine(movability), |
| .. |
| } => movability, |
| _ => unreachable!("non coroutine expression interned as coroutine"), |
| }; |
| let movability = match movability { |
| Movability::Static => rust_ir::Movability::Static, |
| Movability::Movable => rust_ir::Movability::Movable, |
| }; |
| |
| Arc::new(rust_ir::CoroutineDatum { movability, input_output }) |
| } |
| fn coroutine_witness_datum( |
| &self, |
| id: chalk_ir::CoroutineId<Interner>, |
| ) -> Arc<chalk_solve::rust_ir::CoroutineWitnessDatum<Interner>> { |
| // FIXME: calculate inner types |
| let inner_types = |
| rust_ir::CoroutineWitnessExistential { types: wrap_empty_binders(vec![]) }; |
| |
| let (parent, _) = self.db.lookup_intern_coroutine(id.into()); |
| // See the comment in `coroutine_datum()` for unknown types. |
| let subst = TyBuilder::subst_for_coroutine(self.db, parent).fill_with_unknown().build(); |
| let it = subst |
| .iter(Interner) |
| .map(|it| it.constant(Interner).map(|c| c.data(Interner).ty.clone())); |
| let inner_types = crate::make_type_and_const_binders(it, inner_types); |
| |
| Arc::new(rust_ir::CoroutineWitnessDatum { inner_types }) |
| } |
| |
| fn unification_database(&self) -> &dyn chalk_ir::UnificationDatabase<Interner> { |
| &self.db |
| } |
| } |
| |
| impl chalk_ir::UnificationDatabase<Interner> for &dyn HirDatabase { |
| fn fn_def_variance( |
| &self, |
| fn_def_id: chalk_ir::FnDefId<Interner>, |
| ) -> chalk_ir::Variances<Interner> { |
| HirDatabase::fn_def_variance(*self, fn_def_id) |
| } |
| |
| fn adt_variance(&self, adt_id: chalk_ir::AdtId<Interner>) -> chalk_ir::Variances<Interner> { |
| HirDatabase::adt_variance(*self, adt_id) |
| } |
| } |
| |
| pub(crate) fn program_clauses_for_chalk_env_query( |
| db: &dyn HirDatabase, |
| krate: CrateId, |
| block: Option<BlockId>, |
| environment: chalk_ir::Environment<Interner>, |
| ) -> chalk_ir::ProgramClauses<Interner> { |
| chalk_solve::program_clauses_for_env(&ChalkContext { db, krate, block }, &environment) |
| } |
| |
| pub(crate) fn associated_ty_data_query( |
| db: &dyn HirDatabase, |
| id: AssocTypeId, |
| ) -> Arc<AssociatedTyDatum> { |
| debug!("associated_ty_data {:?}", id); |
| let type_alias: TypeAliasId = from_assoc_type_id(id); |
| let trait_ = match type_alias.lookup(db.upcast()).container { |
| ItemContainerId::TraitId(t) => t, |
| _ => panic!("associated type not in trait"), |
| }; |
| |
| // Lower bounds -- we could/should maybe move this to a separate query in `lower` |
| let type_alias_data = db.type_alias_data(type_alias); |
| let generic_params = generics(db.upcast(), type_alias.into()); |
| // let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST); |
| let resolver = hir_def::resolver::HasResolver::resolver(type_alias, db.upcast()); |
| let ctx = crate::TyLoweringContext::new(db, &resolver, type_alias.into()) |
| .with_type_param_mode(crate::lower::ParamLoweringMode::Variable); |
| |
| let trait_subst = TyBuilder::subst_for_def(db, trait_, None) |
| .fill_with_bound_vars(crate::DebruijnIndex::INNERMOST, generic_params.len_self()) |
| .build(); |
| let pro_ty = TyBuilder::assoc_type_projection(db, type_alias, Some(trait_subst)) |
| .fill_with_bound_vars(crate::DebruijnIndex::INNERMOST, 0) |
| .build(); |
| let self_ty = TyKind::Alias(AliasTy::Projection(pro_ty)).intern(Interner); |
| |
| let mut bounds: Vec<_> = type_alias_data |
| .bounds |
| .iter() |
| .flat_map(|bound| ctx.lower_type_bound(bound, self_ty.clone(), false)) |
| .filter_map(|pred| generic_predicate_to_inline_bound(db, &pred, &self_ty)) |
| .collect(); |
| |
| if !ctx.unsized_types.borrow().contains(&self_ty) { |
| let sized_trait = db |
| .lang_item(resolver.krate(), LangItem::Sized) |
| .and_then(|lang_item| lang_item.as_trait().map(to_chalk_trait_id)); |
| let sized_bound = sized_trait.into_iter().map(|sized_trait| { |
| let trait_bound = |
| rust_ir::TraitBound { trait_id: sized_trait, args_no_self: Default::default() }; |
| let inline_bound = rust_ir::InlineBound::TraitBound(trait_bound); |
| chalk_ir::Binders::empty(Interner, inline_bound) |
| }); |
| bounds.extend(sized_bound); |
| bounds.shrink_to_fit(); |
| } |
| |
| // FIXME: Re-enable where clauses on associated types when an upstream chalk bug is fixed. |
| // (rust-analyzer#9052) |
| // let where_clauses = convert_where_clauses(db, type_alias.into(), &bound_vars); |
| let bound_data = rust_ir::AssociatedTyDatumBound { bounds, where_clauses: vec![] }; |
| let datum = AssociatedTyDatum { |
| trait_id: to_chalk_trait_id(trait_), |
| id, |
| name: type_alias, |
| binders: make_binders(db, &generic_params, bound_data), |
| }; |
| Arc::new(datum) |
| } |
| |
| pub(crate) fn trait_datum_query( |
| db: &dyn HirDatabase, |
| krate: CrateId, |
| trait_id: TraitId, |
| ) -> Arc<TraitDatum> { |
| debug!("trait_datum {:?}", trait_id); |
| let trait_ = from_chalk_trait_id(trait_id); |
| let trait_data = db.trait_data(trait_); |
| debug!("trait {:?} = {:?}", trait_id, trait_data.name); |
| let generic_params = generics(db.upcast(), trait_.into()); |
| let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST); |
| let flags = rust_ir::TraitFlags { |
| auto: trait_data.is_auto, |
| upstream: trait_.lookup(db.upcast()).container.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(to_assoc_type_id).collect(); |
| let trait_datum_bound = rust_ir::TraitDatumBound { where_clauses }; |
| let well_known = db.lang_attr(trait_.into()).and_then(well_known_trait_from_lang_item); |
| let trait_datum = TraitDatum { |
| id: trait_id, |
| binders: make_binders(db, &generic_params, trait_datum_bound), |
| flags, |
| associated_ty_ids, |
| well_known, |
| }; |
| Arc::new(trait_datum) |
| } |
| |
| fn well_known_trait_from_lang_item(item: LangItem) -> Option<WellKnownTrait> { |
| Some(match item { |
| LangItem::Clone => WellKnownTrait::Clone, |
| LangItem::CoerceUnsized => WellKnownTrait::CoerceUnsized, |
| LangItem::Copy => WellKnownTrait::Copy, |
| LangItem::DiscriminantKind => WellKnownTrait::DiscriminantKind, |
| LangItem::DispatchFromDyn => WellKnownTrait::DispatchFromDyn, |
| LangItem::Drop => WellKnownTrait::Drop, |
| LangItem::Fn => WellKnownTrait::Fn, |
| LangItem::FnMut => WellKnownTrait::FnMut, |
| LangItem::FnOnce => WellKnownTrait::FnOnce, |
| LangItem::Coroutine => WellKnownTrait::Coroutine, |
| LangItem::Sized => WellKnownTrait::Sized, |
| LangItem::Unpin => WellKnownTrait::Unpin, |
| LangItem::Unsize => WellKnownTrait::Unsize, |
| LangItem::Tuple => WellKnownTrait::Tuple, |
| LangItem::PointeeTrait => WellKnownTrait::Pointee, |
| LangItem::FnPtrTrait => WellKnownTrait::FnPtr, |
| _ => return None, |
| }) |
| } |
| |
| fn lang_item_from_well_known_trait(trait_: WellKnownTrait) -> LangItem { |
| match trait_ { |
| WellKnownTrait::Clone => LangItem::Clone, |
| WellKnownTrait::CoerceUnsized => LangItem::CoerceUnsized, |
| WellKnownTrait::Copy => LangItem::Copy, |
| WellKnownTrait::DiscriminantKind => LangItem::DiscriminantKind, |
| WellKnownTrait::DispatchFromDyn => LangItem::DispatchFromDyn, |
| WellKnownTrait::Drop => LangItem::Drop, |
| WellKnownTrait::Fn => LangItem::Fn, |
| WellKnownTrait::FnMut => LangItem::FnMut, |
| WellKnownTrait::FnOnce => LangItem::FnOnce, |
| WellKnownTrait::Coroutine => LangItem::Coroutine, |
| WellKnownTrait::Sized => LangItem::Sized, |
| WellKnownTrait::Tuple => LangItem::Tuple, |
| WellKnownTrait::Unpin => LangItem::Unpin, |
| WellKnownTrait::Unsize => LangItem::Unsize, |
| WellKnownTrait::Pointee => LangItem::PointeeTrait, |
| WellKnownTrait::FnPtr => LangItem::FnPtrTrait, |
| } |
| } |
| |
| pub(crate) fn struct_datum_query( |
| db: &dyn HirDatabase, |
| krate: CrateId, |
| struct_id: AdtId, |
| ) -> Arc<StructDatum> { |
| debug!("struct_datum {:?}", struct_id); |
| let chalk_ir::AdtId(adt_id) = struct_id; |
| let generic_params = generics(db.upcast(), adt_id.into()); |
| let upstream = adt_id.module(db.upcast()).krate() != krate; |
| let where_clauses = { |
| let generic_params = generics(db.upcast(), adt_id.into()); |
| let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST); |
| convert_where_clauses(db, adt_id.into(), &bound_vars) |
| }; |
| let flags = rust_ir::AdtFlags { |
| upstream, |
| // FIXME set fundamental and phantom_data flags correctly |
| fundamental: false, |
| phantom_data: false, |
| }; |
| // FIXME provide enum variants properly (for auto traits) |
| let variant = rust_ir::AdtVariantDatum { |
| fields: Vec::new(), // FIXME add fields (only relevant for auto traits), |
| }; |
| let struct_datum_bound = rust_ir::AdtDatumBound { variants: vec![variant], where_clauses }; |
| let struct_datum = StructDatum { |
| // FIXME set ADT kind |
| kind: rust_ir::AdtKind::Struct, |
| id: struct_id, |
| binders: make_binders(db, &generic_params, struct_datum_bound), |
| flags, |
| }; |
| Arc::new(struct_datum) |
| } |
| |
| pub(crate) fn impl_datum_query( |
| db: &dyn HirDatabase, |
| krate: CrateId, |
| impl_id: ImplId, |
| ) -> Arc<ImplDatum> { |
| let _p = profile::span("impl_datum"); |
| debug!("impl_datum {:?}", impl_id); |
| let impl_: hir_def::ImplId = from_chalk(db, impl_id); |
| impl_def_datum(db, krate, impl_id, impl_) |
| } |
| |
| fn impl_def_datum( |
| db: &dyn HirDatabase, |
| krate: CrateId, |
| chalk_id: ImplId, |
| impl_id: hir_def::ImplId, |
| ) -> Arc<ImplDatum> { |
| let trait_ref = db |
| .impl_trait(impl_id) |
| // ImplIds for impls where the trait ref can't be resolved should never reach Chalk |
| .expect("invalid impl passed to Chalk") |
| .into_value_and_skipped_binders() |
| .0; |
| let impl_data = db.impl_data(impl_id); |
| |
| let generic_params = generics(db.upcast(), impl_id.into()); |
| let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST); |
| let trait_ = trait_ref.hir_trait_id(); |
| let impl_type = if impl_id.lookup(db.upcast()).container.krate() == krate { |
| rust_ir::ImplType::Local |
| } else { |
| 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 polarity = if negative { rust_ir::Polarity::Negative } else { rust_ir::Polarity::Positive }; |
| |
| let impl_datum_bound = 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| TypeAliasAsValue(type_alias).to_chalk(db)) |
| .collect(); |
| debug!("impl_datum: {:?}", impl_datum_bound); |
| let impl_datum = ImplDatum { |
| binders: make_binders(db, &generic_params, impl_datum_bound), |
| impl_type, |
| polarity, |
| associated_ty_value_ids, |
| }; |
| Arc::new(impl_datum) |
| } |
| |
| pub(crate) fn associated_ty_value_query( |
| db: &dyn HirDatabase, |
| krate: CrateId, |
| id: AssociatedTyValueId, |
| ) -> Arc<AssociatedTyValue> { |
| let type_alias: TypeAliasAsValue = from_chalk(db, id); |
| type_alias_associated_ty_value(db, krate, type_alias.0) |
| } |
| |
| fn type_alias_associated_ty_value( |
| db: &dyn HirDatabase, |
| _krate: CrateId, |
| type_alias: TypeAliasId, |
| ) -> Arc<AssociatedTyValue> { |
| let type_alias_data = db.type_alias_data(type_alias); |
| let impl_id = match type_alias.lookup(db.upcast()).container { |
| ItemContainerId::ImplId(it) => it, |
| _ => panic!("assoc ty value should be in impl"), |
| }; |
| |
| let trait_ref = db |
| .impl_trait(impl_id) |
| .expect("assoc ty value should not exist") |
| .into_value_and_skipped_binders() |
| .0; // we don't return any assoc ty values if the impl'd trait can't be resolved |
| |
| let assoc_ty = db |
| .trait_data(trait_ref.hir_trait_id()) |
| .associated_type_by_name(&type_alias_data.name) |
| .expect("assoc ty value should not exist"); // validated when building the impl data as well |
| let (ty, binders) = db.ty(type_alias.into()).into_value_and_skipped_binders(); |
| let value_bound = rust_ir::AssociatedTyValueBound { ty }; |
| let value = rust_ir::AssociatedTyValue { |
| impl_id: impl_id.to_chalk(db), |
| associated_ty_id: to_assoc_type_id(assoc_ty), |
| value: chalk_ir::Binders::new(binders, value_bound), |
| }; |
| Arc::new(value) |
| } |
| |
| pub(crate) fn fn_def_datum_query( |
| db: &dyn HirDatabase, |
| _krate: CrateId, |
| fn_def_id: FnDefId, |
| ) -> Arc<FnDefDatum> { |
| let callable_def: CallableDefId = from_chalk(db, fn_def_id); |
| let generic_params = generics(db.upcast(), callable_def.into()); |
| let (sig, binders) = db.callable_item_signature(callable_def).into_value_and_skipped_binders(); |
| let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST); |
| let where_clauses = convert_where_clauses(db, callable_def.into(), &bound_vars); |
| let bound = rust_ir::FnDefDatumBound { |
| // Note: Chalk doesn't actually use this information yet as far as I am aware, but we provide it anyway |
| inputs_and_output: chalk_ir::Binders::empty( |
| Interner, |
| rust_ir::FnDefInputsAndOutputDatum { |
| argument_types: sig.params().to_vec(), |
| return_type: sig.ret().clone(), |
| } |
| .shifted_in(Interner), |
| ), |
| where_clauses, |
| }; |
| let datum = FnDefDatum { |
| id: fn_def_id, |
| sig: chalk_ir::FnSig { |
| abi: sig.abi, |
| safety: chalk_ir::Safety::Safe, |
| variadic: sig.is_varargs, |
| }, |
| binders: chalk_ir::Binders::new(binders, bound), |
| }; |
| Arc::new(datum) |
| } |
| |
| pub(crate) fn fn_def_variance_query(db: &dyn HirDatabase, fn_def_id: FnDefId) -> Variances { |
| let callable_def: CallableDefId = from_chalk(db, fn_def_id); |
| let generic_params = generics(db.upcast(), callable_def.into()); |
| Variances::from_iter( |
| Interner, |
| std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()), |
| ) |
| } |
| |
| pub(crate) fn adt_variance_query( |
| db: &dyn HirDatabase, |
| chalk_ir::AdtId(adt_id): AdtId, |
| ) -> Variances { |
| let generic_params = generics(db.upcast(), adt_id.into()); |
| Variances::from_iter( |
| Interner, |
| std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()), |
| ) |
| } |
| |
| /// Returns instantiated predicates. |
| pub(super) fn convert_where_clauses( |
| db: &dyn HirDatabase, |
| def: GenericDefId, |
| substs: &Substitution, |
| ) -> Vec<chalk_ir::QuantifiedWhereClause<Interner>> { |
| db.generic_predicates(def) |
| .iter() |
| .cloned() |
| .map(|pred| pred.substitute(Interner, substs)) |
| .collect() |
| } |
| |
| pub(super) fn generic_predicate_to_inline_bound( |
| db: &dyn HirDatabase, |
| pred: &QuantifiedWhereClause, |
| self_ty: &Ty, |
| ) -> Option<chalk_ir::Binders<rust_ir::InlineBound<Interner>>> { |
| // An InlineBound is like a GenericPredicate, except the self type is left out. |
| // We don't have a special type for this, but Chalk does. |
| let self_ty_shifted_in = self_ty.clone().shifted_in_from(Interner, DebruijnIndex::ONE); |
| let (pred, binders) = pred.as_ref().into_value_and_skipped_binders(); |
| match pred { |
| WhereClause::Implemented(trait_ref) => { |
| if trait_ref.self_type_parameter(Interner) != self_ty_shifted_in { |
| // we can only convert predicates back to type bounds if they |
| // have the expected self type |
| return None; |
| } |
| let args_no_self = trait_ref.substitution.as_slice(Interner)[1..] |
| .iter() |
| .cloned() |
| .casted(Interner) |
| .collect(); |
| let trait_bound = rust_ir::TraitBound { trait_id: trait_ref.trait_id, args_no_self }; |
| Some(chalk_ir::Binders::new(binders, rust_ir::InlineBound::TraitBound(trait_bound))) |
| } |
| WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => { |
| let generics = |
| generics(db.upcast(), from_assoc_type_id(projection_ty.associated_ty_id).into()); |
| let (assoc_args, trait_args) = |
| projection_ty.substitution.as_slice(Interner).split_at(generics.len_self()); |
| let (self_ty, args_no_self) = |
| trait_args.split_first().expect("projection without trait self type"); |
| if self_ty.assert_ty_ref(Interner) != &self_ty_shifted_in { |
| return None; |
| } |
| |
| let args_no_self = args_no_self.iter().cloned().casted(Interner).collect(); |
| let parameters = assoc_args.to_vec(); |
| |
| let alias_eq_bound = rust_ir::AliasEqBound { |
| value: ty.clone(), |
| trait_bound: rust_ir::TraitBound { |
| trait_id: to_chalk_trait_id(projection_ty.trait_(db)), |
| args_no_self, |
| }, |
| associated_ty_id: projection_ty.associated_ty_id, |
| parameters, |
| }; |
| Some(chalk_ir::Binders::new( |
| binders, |
| rust_ir::InlineBound::AliasEqBound(alias_eq_bound), |
| )) |
| } |
| _ => None, |
| } |
| } |
