| //! Provides the `RustIrDatabase` implementation for `chalk-solve` |
| //! |
| //! The purpose of the `chalk_solve::RustIrDatabase` is to get data about |
| //! specific types, such as bounds, where clauses, or fields. This file contains |
| //! the minimal logic to assemble the types for `chalk-solve` by calling out to |
| //! either the `TyCtxt` (for information about types) or |
| //! `crate::chalk::lowering` (to lower rustc types into Chalk types). |
| |
| use rustc_middle::traits::ChalkRustInterner as RustInterner; |
| use rustc_middle::ty::subst::{InternalSubsts, Subst, SubstsRef}; |
| use rustc_middle::ty::{self, AssocItemContainer, AssocKind, TyCtxt, TypeFoldable}; |
| |
| use rustc_hir::def_id::DefId; |
| |
| use rustc_span::symbol::sym; |
| |
| use std::fmt; |
| use std::sync::Arc; |
| |
| use crate::chalk::lowering::{self, LowerInto}; |
| use rustc_ast::ast; |
| |
| pub struct RustIrDatabase<'tcx> { |
| pub(crate) interner: RustInterner<'tcx>, |
| pub(crate) restatic_placeholder: ty::Region<'tcx>, |
| pub(crate) reempty_placeholder: ty::Region<'tcx>, |
| } |
| |
| impl fmt::Debug for RustIrDatabase<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "RustIrDatabase") |
| } |
| } |
| |
| impl<'tcx> RustIrDatabase<'tcx> { |
| fn where_clauses_for( |
| &self, |
| def_id: DefId, |
| bound_vars: SubstsRef<'tcx>, |
| ) -> Vec<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> { |
| let predicates = self.interner.tcx.predicates_of(def_id).predicates; |
| let mut regions_substitutor = lowering::RegionsSubstitutor::new( |
| self.interner.tcx, |
| self.restatic_placeholder, |
| self.reempty_placeholder, |
| ); |
| predicates |
| .iter() |
| .map(|(wc, _)| wc.subst(self.interner.tcx, bound_vars)) |
| .map(|wc| wc.fold_with(&mut regions_substitutor)) |
| .filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect() |
| } |
| } |
| |
| impl<'tcx> chalk_solve::RustIrDatabase<RustInterner<'tcx>> for RustIrDatabase<'tcx> { |
| fn interner(&self) -> &RustInterner<'tcx> { |
| &self.interner |
| } |
| |
| fn associated_ty_data( |
| &self, |
| assoc_type_id: chalk_ir::AssocTypeId<RustInterner<'tcx>>, |
| ) -> Arc<chalk_solve::rust_ir::AssociatedTyDatum<RustInterner<'tcx>>> { |
| let def_id = assoc_type_id.0; |
| let assoc_item = self.interner.tcx.associated_item(def_id); |
| let trait_def_id = match assoc_item.container { |
| AssocItemContainer::TraitContainer(def_id) => def_id, |
| _ => unimplemented!("Not possible??"), |
| }; |
| match assoc_item.kind { |
| AssocKind::Type => {} |
| _ => unimplemented!("Not possible??"), |
| } |
| let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| // FIXME(chalk): this really isn't right I don't think. The functions |
| // for GATs are a bit hard to figure out. Are these supposed to be where |
| // clauses or bounds? |
| let where_clauses = self.where_clauses_for(def_id, bound_vars); |
| |
| Arc::new(chalk_solve::rust_ir::AssociatedTyDatum { |
| trait_id: chalk_ir::TraitId(trait_def_id), |
| id: assoc_type_id, |
| name: (), |
| binders: chalk_ir::Binders::new( |
| binders, |
| chalk_solve::rust_ir::AssociatedTyDatumBound { bounds: vec![], where_clauses }, |
| ), |
| }) |
| } |
| |
| fn trait_datum( |
| &self, |
| trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, |
| ) -> Arc<chalk_solve::rust_ir::TraitDatum<RustInterner<'tcx>>> { |
| let def_id = trait_id.0; |
| let trait_def = self.interner.tcx.trait_def(def_id); |
| |
| let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| |
| let where_clauses = self.where_clauses_for(def_id, bound_vars); |
| |
| let associated_ty_ids: Vec<_> = self |
| .interner |
| .tcx |
| .associated_items(def_id) |
| .in_definition_order() |
| .filter(|i| i.kind == AssocKind::Type) |
| .map(|i| chalk_ir::AssocTypeId(i.def_id)) |
| .collect(); |
| |
| let well_known = if self.interner.tcx.lang_items().sized_trait() == Some(def_id) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Sized) |
| } else if self.interner.tcx.lang_items().copy_trait() == Some(def_id) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Copy) |
| } else if self.interner.tcx.lang_items().clone_trait() == Some(def_id) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Clone) |
| } else if self.interner.tcx.lang_items().drop_trait() == Some(def_id) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Drop) |
| } else if self.interner.tcx.lang_items().fn_trait() == Some(def_id) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Fn) |
| } else if self |
| .interner |
| .tcx |
| .lang_items() |
| .fn_once_trait() |
| .map(|t| def_id == t) |
| .unwrap_or(false) |
| { |
| Some(chalk_solve::rust_ir::WellKnownTrait::FnOnce) |
| } else if self |
| .interner |
| .tcx |
| .lang_items() |
| .fn_mut_trait() |
| .map(|t| def_id == t) |
| .unwrap_or(false) |
| { |
| Some(chalk_solve::rust_ir::WellKnownTrait::FnMut) |
| } else { |
| None |
| }; |
| Arc::new(chalk_solve::rust_ir::TraitDatum { |
| id: trait_id, |
| binders: chalk_ir::Binders::new( |
| binders, |
| chalk_solve::rust_ir::TraitDatumBound { where_clauses }, |
| ), |
| flags: chalk_solve::rust_ir::TraitFlags { |
| auto: trait_def.has_auto_impl, |
| marker: trait_def.is_marker, |
| upstream: !def_id.is_local(), |
| fundamental: self.interner.tcx.has_attr(def_id, sym::fundamental), |
| non_enumerable: true, |
| coinductive: false, |
| }, |
| associated_ty_ids, |
| well_known, |
| }) |
| } |
| |
| fn adt_datum( |
| &self, |
| adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, |
| ) -> Arc<chalk_solve::rust_ir::AdtDatum<RustInterner<'tcx>>> { |
| let adt_def = adt_id.0; |
| |
| let bound_vars = bound_vars_for_item(self.interner.tcx, adt_def.did); |
| let binders = binders_for(&self.interner, bound_vars); |
| |
| let where_clauses = self.where_clauses_for(adt_def.did, bound_vars); |
| |
| let variants: Vec<_> = adt_def |
| .variants |
| .iter() |
| .map(|variant| chalk_solve::rust_ir::AdtVariantDatum { |
| fields: variant |
| .fields |
| .iter() |
| .map(|field| field.ty(self.interner.tcx, bound_vars).lower_into(&self.interner)) |
| .collect(), |
| }) |
| .collect(); |
| Arc::new(chalk_solve::rust_ir::AdtDatum { |
| id: adt_id, |
| binders: chalk_ir::Binders::new( |
| binders, |
| chalk_solve::rust_ir::AdtDatumBound { variants, where_clauses }, |
| ), |
| flags: chalk_solve::rust_ir::AdtFlags { |
| upstream: !adt_def.did.is_local(), |
| fundamental: adt_def.is_fundamental(), |
| phantom_data: adt_def.is_phantom_data(), |
| }, |
| kind: match adt_def.adt_kind() { |
| ty::AdtKind::Struct => chalk_solve::rust_ir::AdtKind::Struct, |
| ty::AdtKind::Union => chalk_solve::rust_ir::AdtKind::Union, |
| ty::AdtKind::Enum => chalk_solve::rust_ir::AdtKind::Enum, |
| }, |
| }) |
| } |
| |
| fn adt_repr( |
| &self, |
| adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, |
| ) -> chalk_solve::rust_ir::AdtRepr { |
| let adt_def = adt_id.0; |
| chalk_solve::rust_ir::AdtRepr { |
| repr_c: adt_def.repr.c(), |
| repr_packed: adt_def.repr.packed(), |
| } |
| } |
| |
| fn fn_def_datum( |
| &self, |
| fn_def_id: chalk_ir::FnDefId<RustInterner<'tcx>>, |
| ) -> Arc<chalk_solve::rust_ir::FnDefDatum<RustInterner<'tcx>>> { |
| let def_id = fn_def_id.0; |
| let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| |
| let where_clauses = self.where_clauses_for(def_id, bound_vars); |
| |
| let sig = self.interner.tcx.fn_sig(def_id); |
| let (inputs_and_output, iobinders, _) = crate::chalk::lowering::collect_bound_vars( |
| &self.interner, |
| self.interner.tcx, |
| &sig.inputs_and_output().subst(self.interner.tcx, bound_vars), |
| ); |
| |
| let argument_types = inputs_and_output[..inputs_and_output.len() - 1] |
| .iter() |
| .map(|t| t.subst(self.interner.tcx, &bound_vars).lower_into(&self.interner)) |
| .collect(); |
| |
| let return_type = inputs_and_output[inputs_and_output.len() - 1] |
| .subst(self.interner.tcx, &bound_vars) |
| .lower_into(&self.interner); |
| |
| let bound = chalk_solve::rust_ir::FnDefDatumBound { |
| inputs_and_output: chalk_ir::Binders::new( |
| iobinders, |
| chalk_solve::rust_ir::FnDefInputsAndOutputDatum { argument_types, return_type }, |
| ), |
| where_clauses, |
| }; |
| Arc::new(chalk_solve::rust_ir::FnDefDatum { |
| id: fn_def_id, |
| sig: sig.lower_into(&self.interner), |
| binders: chalk_ir::Binders::new(binders, bound), |
| }) |
| } |
| |
| fn impl_datum( |
| &self, |
| impl_id: chalk_ir::ImplId<RustInterner<'tcx>>, |
| ) -> Arc<chalk_solve::rust_ir::ImplDatum<RustInterner<'tcx>>> { |
| let def_id = impl_id.0; |
| let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| |
| let trait_ref = self.interner.tcx.impl_trait_ref(def_id).expect("not an impl"); |
| let trait_ref = trait_ref.subst(self.interner.tcx, bound_vars); |
| let mut regions_substitutor = lowering::RegionsSubstitutor::new( |
| self.interner.tcx, |
| self.restatic_placeholder, |
| self.reempty_placeholder, |
| ); |
| let trait_ref = trait_ref.fold_with(&mut regions_substitutor); |
| |
| let where_clauses = self.where_clauses_for(def_id, bound_vars); |
| |
| let value = chalk_solve::rust_ir::ImplDatumBound { |
| trait_ref: trait_ref.lower_into(&self.interner), |
| where_clauses, |
| }; |
| |
| Arc::new(chalk_solve::rust_ir::ImplDatum { |
| polarity: chalk_solve::rust_ir::Polarity::Positive, |
| binders: chalk_ir::Binders::new(binders, value), |
| impl_type: chalk_solve::rust_ir::ImplType::Local, |
| associated_ty_value_ids: vec![], |
| }) |
| } |
| |
| fn impls_for_trait( |
| &self, |
| trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, |
| parameters: &[chalk_ir::GenericArg<RustInterner<'tcx>>], |
| _binders: &chalk_ir::CanonicalVarKinds<RustInterner<'tcx>>, |
| ) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> { |
| let def_id = trait_id.0; |
| |
| // FIXME(chalk): use TraitDef::for_each_relevant_impl, but that will |
| // require us to be able to interconvert `Ty<'tcx>`, and we're |
| // not there yet. |
| |
| let all_impls = self.interner.tcx.all_impls(def_id); |
| let matched_impls = all_impls.filter(|impl_def_id| { |
| use chalk_ir::could_match::CouldMatch; |
| let trait_ref = self.interner.tcx.impl_trait_ref(*impl_def_id).unwrap(); |
| let bound_vars = bound_vars_for_item(self.interner.tcx, *impl_def_id); |
| |
| let self_ty = trait_ref.self_ty(); |
| let self_ty = self_ty.subst(self.interner.tcx, bound_vars); |
| let mut regions_substitutor = lowering::RegionsSubstitutor::new( |
| self.interner.tcx, |
| self.restatic_placeholder, |
| self.reempty_placeholder, |
| ); |
| let self_ty = self_ty.fold_with(&mut regions_substitutor); |
| let lowered_ty = self_ty.lower_into(&self.interner); |
| |
| parameters[0].assert_ty_ref(&self.interner).could_match(&self.interner, &lowered_ty) |
| }); |
| |
| let impls = matched_impls.map(chalk_ir::ImplId).collect(); |
| impls |
| } |
| |
| fn impl_provided_for( |
| &self, |
| auto_trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, |
| app_ty: &chalk_ir::ApplicationTy<RustInterner<'tcx>>, |
| ) -> bool { |
| use chalk_ir::Scalar::*; |
| use chalk_ir::TypeName::*; |
| |
| let trait_def_id = auto_trait_id.0; |
| let all_impls = self.interner.tcx.all_impls(trait_def_id); |
| for impl_def_id in all_impls { |
| let trait_ref = self.interner.tcx.impl_trait_ref(impl_def_id).unwrap(); |
| let self_ty = trait_ref.self_ty(); |
| let provides = match (self_ty.kind(), app_ty.name) { |
| (&ty::Adt(impl_adt_def, ..), Adt(id)) => impl_adt_def.did == id.0.did, |
| (_, AssociatedType(_ty_id)) => { |
| // FIXME(chalk): See https://github.com/rust-lang/rust/pull/77152#discussion_r494484774 |
| false |
| } |
| (ty::Bool, Scalar(Bool)) => true, |
| (ty::Char, Scalar(Char)) => true, |
| (ty::Int(ty1), Scalar(Int(ty2))) => match (ty1, ty2) { |
| (ast::IntTy::Isize, chalk_ir::IntTy::Isize) |
| | (ast::IntTy::I8, chalk_ir::IntTy::I8) |
| | (ast::IntTy::I16, chalk_ir::IntTy::I16) |
| | (ast::IntTy::I32, chalk_ir::IntTy::I32) |
| | (ast::IntTy::I64, chalk_ir::IntTy::I64) |
| | (ast::IntTy::I128, chalk_ir::IntTy::I128) => true, |
| _ => false, |
| }, |
| (ty::Uint(ty1), Scalar(Uint(ty2))) => match (ty1, ty2) { |
| (ast::UintTy::Usize, chalk_ir::UintTy::Usize) |
| | (ast::UintTy::U8, chalk_ir::UintTy::U8) |
| | (ast::UintTy::U16, chalk_ir::UintTy::U16) |
| | (ast::UintTy::U32, chalk_ir::UintTy::U32) |
| | (ast::UintTy::U64, chalk_ir::UintTy::U64) |
| | (ast::UintTy::U128, chalk_ir::UintTy::U128) => true, |
| _ => false, |
| }, |
| (ty::Float(ty1), Scalar(Float(ty2))) => match (ty1, ty2) { |
| (ast::FloatTy::F32, chalk_ir::FloatTy::F32) |
| | (ast::FloatTy::F64, chalk_ir::FloatTy::F64) => true, |
| _ => false, |
| }, |
| (&ty::Tuple(..), Tuple(..)) => true, |
| (&ty::Array(..), Array) => true, |
| (&ty::Slice(..), Slice) => true, |
| (&ty::RawPtr(type_and_mut), Raw(mutability)) => { |
| match (type_and_mut.mutbl, mutability) { |
| (ast::Mutability::Mut, chalk_ir::Mutability::Mut) => true, |
| (ast::Mutability::Mut, chalk_ir::Mutability::Not) => false, |
| (ast::Mutability::Not, chalk_ir::Mutability::Mut) => false, |
| (ast::Mutability::Not, chalk_ir::Mutability::Not) => true, |
| } |
| } |
| (&ty::Ref(.., mutability1), Ref(mutability2)) => match (mutability1, mutability2) { |
| (ast::Mutability::Mut, chalk_ir::Mutability::Mut) => true, |
| (ast::Mutability::Mut, chalk_ir::Mutability::Not) => false, |
| (ast::Mutability::Not, chalk_ir::Mutability::Mut) => false, |
| (ast::Mutability::Not, chalk_ir::Mutability::Not) => true, |
| }, |
| (&ty::Opaque(def_id, ..), OpaqueType(opaque_ty_id)) => def_id == opaque_ty_id.0, |
| (&ty::FnDef(def_id, ..), FnDef(fn_def_id)) => def_id == fn_def_id.0, |
| (&ty::Str, Str) => true, |
| (&ty::Never, Never) => true, |
| (&ty::Closure(def_id, ..), Closure(closure_id)) => def_id == closure_id.0, |
| (&ty::Foreign(def_id), Foreign(foreign_def_id)) => def_id == foreign_def_id.0, |
| (&ty::Error(..), Error) => false, |
| _ => false, |
| }; |
| if provides { |
| return true; |
| } |
| } |
| false |
| } |
| |
| fn associated_ty_value( |
| &self, |
| associated_ty_id: chalk_solve::rust_ir::AssociatedTyValueId<RustInterner<'tcx>>, |
| ) -> Arc<chalk_solve::rust_ir::AssociatedTyValue<RustInterner<'tcx>>> { |
| let def_id = associated_ty_id.0; |
| let assoc_item = self.interner.tcx.associated_item(def_id); |
| let impl_id = match assoc_item.container { |
| AssocItemContainer::TraitContainer(def_id) => def_id, |
| _ => unimplemented!("Not possible??"), |
| }; |
| match assoc_item.kind { |
| AssocKind::Type => {} |
| _ => unimplemented!("Not possible??"), |
| } |
| let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| let ty = self.interner.tcx.type_of(def_id); |
| |
| Arc::new(chalk_solve::rust_ir::AssociatedTyValue { |
| impl_id: chalk_ir::ImplId(impl_id), |
| associated_ty_id: chalk_ir::AssocTypeId(def_id), |
| value: chalk_ir::Binders::new( |
| binders, |
| chalk_solve::rust_ir::AssociatedTyValueBound { ty: ty.lower_into(&self.interner) }, |
| ), |
| }) |
| } |
| |
| fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<RustInterner<'tcx>>> { |
| vec![] |
| } |
| |
| fn local_impls_to_coherence_check( |
| &self, |
| _trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, |
| ) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> { |
| unimplemented!() |
| } |
| |
| fn opaque_ty_data( |
| &self, |
| opaque_ty_id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>, |
| ) -> Arc<chalk_solve::rust_ir::OpaqueTyDatum<RustInterner<'tcx>>> { |
| let bound_vars = bound_vars_for_item(self.interner.tcx, opaque_ty_id.0); |
| let binders = binders_for(&self.interner, bound_vars); |
| let where_clauses = self.where_clauses_for(opaque_ty_id.0, bound_vars); |
| |
| let value = chalk_solve::rust_ir::OpaqueTyDatumBound { |
| bounds: chalk_ir::Binders::new(binders.clone(), vec![]), |
| where_clauses: chalk_ir::Binders::new(binders, where_clauses), |
| }; |
| Arc::new(chalk_solve::rust_ir::OpaqueTyDatum { |
| opaque_ty_id, |
| bound: chalk_ir::Binders::empty(&self.interner, value), |
| }) |
| } |
| |
| fn program_clauses_for_env( |
| &self, |
| environment: &chalk_ir::Environment<RustInterner<'tcx>>, |
| ) -> chalk_ir::ProgramClauses<RustInterner<'tcx>> { |
| chalk_solve::program_clauses_for_env(self, environment) |
| } |
| |
| fn well_known_trait_id( |
| &self, |
| well_known_trait: chalk_solve::rust_ir::WellKnownTrait, |
| ) -> Option<chalk_ir::TraitId<RustInterner<'tcx>>> { |
| use chalk_solve::rust_ir::WellKnownTrait::*; |
| let lang_items = self.interner.tcx.lang_items(); |
| let def_id = match well_known_trait { |
| Sized => lang_items.sized_trait(), |
| Copy => lang_items.copy_trait(), |
| Clone => lang_items.clone_trait(), |
| Drop => lang_items.drop_trait(), |
| Fn => lang_items.fn_trait(), |
| FnMut => lang_items.fn_mut_trait(), |
| FnOnce => lang_items.fn_once_trait(), |
| Unsize => lang_items.unsize_trait(), |
| Unpin => lang_items.unpin_trait(), |
| CoerceUnsized => lang_items.coerce_unsized_trait(), |
| }; |
| def_id.map(chalk_ir::TraitId) |
| } |
| |
| fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool { |
| self.interner.tcx.is_object_safe(trait_id.0) |
| } |
| |
| fn hidden_opaque_type( |
| &self, |
| _id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>, |
| ) -> chalk_ir::Ty<RustInterner<'tcx>> { |
| // FIXME(chalk): actually get hidden ty |
| self.interner |
| .tcx |
| .mk_ty(ty::Tuple(self.interner.tcx.intern_substs(&[]))) |
| .lower_into(&self.interner) |
| } |
| |
| fn closure_kind( |
| &self, |
| _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, |
| substs: &chalk_ir::Substitution<RustInterner<'tcx>>, |
| ) -> chalk_solve::rust_ir::ClosureKind { |
| let kind = &substs.as_slice(&self.interner)[substs.len(&self.interner) - 3]; |
| match kind.assert_ty_ref(&self.interner).data(&self.interner) { |
| chalk_ir::TyData::Apply(apply) => match apply.name { |
| chalk_ir::TypeName::Scalar(scalar) => match scalar { |
| chalk_ir::Scalar::Int(int_ty) => match int_ty { |
| chalk_ir::IntTy::I8 => chalk_solve::rust_ir::ClosureKind::Fn, |
| chalk_ir::IntTy::I16 => chalk_solve::rust_ir::ClosureKind::FnMut, |
| chalk_ir::IntTy::I32 => chalk_solve::rust_ir::ClosureKind::FnOnce, |
| _ => bug!("bad closure kind"), |
| }, |
| _ => bug!("bad closure kind"), |
| }, |
| _ => bug!("bad closure kind"), |
| }, |
| _ => bug!("bad closure kind"), |
| } |
| } |
| |
| fn closure_inputs_and_output( |
| &self, |
| _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, |
| substs: &chalk_ir::Substitution<RustInterner<'tcx>>, |
| ) -> chalk_ir::Binders<chalk_solve::rust_ir::FnDefInputsAndOutputDatum<RustInterner<'tcx>>> |
| { |
| let sig = &substs.as_slice(&self.interner)[substs.len(&self.interner) - 2]; |
| match sig.assert_ty_ref(&self.interner).data(&self.interner) { |
| chalk_ir::TyData::Function(f) => { |
| let substitution = f.substitution.as_slice(&self.interner); |
| let return_type = |
| substitution.last().unwrap().assert_ty_ref(&self.interner).clone(); |
| // Closure arguments are tupled |
| let argument_tuple = substitution[0].assert_ty_ref(&self.interner); |
| let argument_types = match argument_tuple.data(&self.interner) { |
| chalk_ir::TyData::Apply(apply) => match apply.name { |
| chalk_ir::TypeName::Tuple(_) => apply |
| .substitution |
| .iter(&self.interner) |
| .map(|arg| arg.assert_ty_ref(&self.interner)) |
| .cloned() |
| .collect(), |
| _ => bug!("Expecting closure FnSig args to be tupled."), |
| }, |
| _ => bug!("Expecting closure FnSig args to be tupled."), |
| }; |
| |
| chalk_ir::Binders::new( |
| chalk_ir::VariableKinds::from_iter( |
| &self.interner, |
| (0..f.num_binders).map(|_| chalk_ir::VariableKind::Lifetime), |
| ), |
| chalk_solve::rust_ir::FnDefInputsAndOutputDatum { argument_types, return_type }, |
| ) |
| } |
| _ => panic!("Invalid sig."), |
| } |
| } |
| |
| fn closure_upvars( |
| &self, |
| _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, |
| substs: &chalk_ir::Substitution<RustInterner<'tcx>>, |
| ) -> chalk_ir::Binders<chalk_ir::Ty<RustInterner<'tcx>>> { |
| let inputs_and_output = self.closure_inputs_and_output(_closure_id, substs); |
| let tuple = substs.as_slice(&self.interner).last().unwrap().assert_ty_ref(&self.interner); |
| inputs_and_output.map_ref(|_| tuple.clone()) |
| } |
| |
| fn closure_fn_substitution( |
| &self, |
| _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, |
| substs: &chalk_ir::Substitution<RustInterner<'tcx>>, |
| ) -> chalk_ir::Substitution<RustInterner<'tcx>> { |
| let substitution = &substs.as_slice(&self.interner)[0..substs.len(&self.interner) - 3]; |
| chalk_ir::Substitution::from_iter(&self.interner, substitution) |
| } |
| } |
| |
| /// Creates a `InternalSubsts` that maps each generic parameter to a higher-ranked |
| /// var bound at index `0`. For types, we use a `BoundVar` index equal to |
| /// the type parameter index. For regions, we use the `BoundRegion::BrNamed` |
| /// variant (which has a `DefId`). |
| fn bound_vars_for_item(tcx: TyCtxt<'tcx>, def_id: DefId) -> SubstsRef<'tcx> { |
| InternalSubsts::for_item(tcx, def_id, |param, substs| match param.kind { |
| ty::GenericParamDefKind::Type { .. } => tcx |
| .mk_ty(ty::Bound( |
| ty::INNERMOST, |
| ty::BoundTy { |
| var: ty::BoundVar::from(param.index), |
| kind: ty::BoundTyKind::Param(param.name), |
| }, |
| )) |
| .into(), |
| |
| ty::GenericParamDefKind::Lifetime => tcx |
| .mk_region(ty::RegionKind::ReLateBound( |
| ty::INNERMOST, |
| ty::BoundRegion::BrAnon(substs.len() as u32), |
| )) |
| .into(), |
| |
| ty::GenericParamDefKind::Const => tcx |
| .mk_const(ty::Const { |
| val: ty::ConstKind::Bound(ty::INNERMOST, ty::BoundVar::from(param.index)), |
| ty: tcx.type_of(param.def_id), |
| }) |
| .into(), |
| }) |
| } |
| |
| fn binders_for<'tcx>( |
| interner: &RustInterner<'tcx>, |
| bound_vars: SubstsRef<'tcx>, |
| ) -> chalk_ir::VariableKinds<RustInterner<'tcx>> { |
| chalk_ir::VariableKinds::from_iter( |
| interner, |
| bound_vars.iter().map(|arg| match arg.unpack() { |
| ty::subst::GenericArgKind::Lifetime(_re) => chalk_ir::VariableKind::Lifetime, |
| ty::subst::GenericArgKind::Type(_ty) => { |
| chalk_ir::VariableKind::Ty(chalk_ir::TyKind::General) |
| } |
| ty::subst::GenericArgKind::Const(c) => { |
| chalk_ir::VariableKind::Const(c.ty.lower_into(interner)) |
| } |
| }), |
| ) |
| } |
