| //! 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}; |
| |
| use rustc_hir::def_id::DefId; |
| |
| use rustc_span::symbol::sym; |
| |
| use std::fmt; |
| use std::sync::Arc; |
| |
| use crate::chalk::lowering::LowerInto; |
| |
| pub struct RustIrDatabase<'tcx> { |
| pub tcx: TyCtxt<'tcx>, |
| pub interner: RustInterner<'tcx>, |
| } |
| |
| impl fmt::Debug for RustIrDatabase<'_> { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "RustIrDatabase") |
| } |
| } |
| |
| 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.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.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 predicates = self.tcx.predicates_defined_on(def_id).predicates; |
| let where_clauses: Vec<_> = predicates |
| .iter() |
| .map(|(wc, _)| wc.subst(self.tcx, &bound_vars)) |
| .filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect(); |
| |
| 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.tcx.trait_def(def_id); |
| |
| let bound_vars = bound_vars_for_item(self.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| let predicates = self.tcx.predicates_defined_on(def_id).predicates; |
| let where_clauses: Vec<_> = predicates |
| .iter() |
| .map(|(wc, _)| wc.subst(self.tcx, &bound_vars)) |
| .filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect(); |
| let associated_ty_ids: Vec<_> = self |
| .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.tcx.lang_items().sized_trait().map(|t| def_id == t).unwrap_or(false) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Sized) |
| } else if self.tcx.lang_items().copy_trait().map(|t| def_id == t).unwrap_or(false) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Copy) |
| } else if self.tcx.lang_items().clone_trait().map(|t| def_id == t).unwrap_or(false) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Clone) |
| } else if self.tcx.lang_items().drop_trait().map(|t| def_id == t).unwrap_or(false) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Drop) |
| } else if self.tcx.lang_items().fn_trait().map(|t| def_id == t).unwrap_or(false) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::Fn) |
| } else if self.tcx.lang_items().fn_once_trait().map(|t| def_id == t).unwrap_or(false) { |
| Some(chalk_solve::rust_ir::WellKnownTrait::FnOnce) |
| } else if self.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.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.tcx, adt_def.did); |
| let binders = binders_for(&self.interner, bound_vars); |
| |
| let predicates = self.tcx.predicates_of(adt_def.did).predicates; |
| let where_clauses: Vec<_> = predicates |
| .into_iter() |
| .map(|(wc, _)| wc.subst(self.tcx, bound_vars)) |
| .filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)) |
| .collect(); |
| let fields = match adt_def.adt_kind() { |
| ty::AdtKind::Struct | ty::AdtKind::Union => { |
| let variant = adt_def.non_enum_variant(); |
| variant |
| .fields |
| .iter() |
| .map(|field| { |
| self.tcx |
| .type_of(field.did) |
| .subst(self.tcx, bound_vars) |
| .lower_into(&self.interner) |
| }) |
| .collect() |
| } |
| // FIXME(chalk): handle enums; force_impl_for requires this |
| ty::AdtKind::Enum => vec![], |
| }; |
| let struct_datum = Arc::new(chalk_solve::rust_ir::AdtDatum { |
| id: adt_id, |
| binders: chalk_ir::Binders::new( |
| binders, |
| chalk_solve::rust_ir::AdtDatumBound { fields, 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(), |
| }, |
| }); |
| return struct_datum; |
| } |
| |
| 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.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| |
| let predicates = self.tcx.predicates_defined_on(def_id).predicates; |
| let where_clauses: Vec<_> = predicates |
| .into_iter() |
| .map(|(wc, _)| wc.subst(self.tcx, &bound_vars)) |
| .filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect(); |
| |
| let sig = self.tcx.fn_sig(def_id); |
| let inputs_and_output = sig.inputs_and_output(); |
| let (inputs_and_output, iobinders, _) = crate::chalk::lowering::collect_bound_vars( |
| &self.interner, |
| self.tcx, |
| &inputs_and_output, |
| ); |
| |
| let argument_types = inputs_and_output[..inputs_and_output.len() - 1] |
| .iter() |
| .map(|t| t.subst(self.tcx, &bound_vars).lower_into(&self.interner)) |
| .collect(); |
| |
| let return_type = inputs_and_output[inputs_and_output.len() - 1] |
| .subst(self.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, |
| abi: sig.abi(), |
| 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.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| |
| let trait_ref = self.tcx.impl_trait_ref(def_id).expect("not an impl"); |
| let trait_ref = trait_ref.subst(self.tcx, bound_vars); |
| |
| let predicates = self.tcx.predicates_of(def_id).predicates; |
| let where_clauses: Vec<_> = predicates |
| .iter() |
| .map(|(wc, _)| wc.subst(self.tcx, bound_vars)) |
| .filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect(); |
| |
| 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>>], |
| ) -> 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.tcx.all_impls(def_id); |
| let matched_impls = all_impls.filter(|impl_def_id| { |
| use chalk_ir::could_match::CouldMatch; |
| let trait_ref = self.tcx.impl_trait_ref(*impl_def_id).unwrap(); |
| let bound_vars = bound_vars_for_item(self.tcx, *impl_def_id); |
| |
| let self_ty = trait_ref.self_ty(); |
| let self_ty = self_ty.subst(self.tcx, bound_vars); |
| 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(|matched_impl| chalk_ir::ImplId(matched_impl)).collect(); |
| impls |
| } |
| |
| fn impl_provided_for( |
| &self, |
| auto_trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, |
| adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, |
| ) -> bool { |
| let trait_def_id = auto_trait_id.0; |
| let adt_def = adt_id.0; |
| let all_impls = self.tcx.all_impls(trait_def_id); |
| for impl_def_id in all_impls { |
| let trait_ref = self.tcx.impl_trait_ref(impl_def_id).unwrap(); |
| let self_ty = trait_ref.self_ty(); |
| match self_ty.kind { |
| ty::Adt(impl_adt_def, _) => { |
| if impl_adt_def == adt_def { |
| 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.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.tcx, def_id); |
| let binders = binders_for(&self.interner, bound_vars); |
| let ty = self.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.tcx, opaque_ty_id.0); |
| let binders = binders_for(&self.interner, bound_vars); |
| let predicates = self.tcx.predicates_defined_on(opaque_ty_id.0).predicates; |
| let where_clauses: Vec<_> = predicates |
| .iter() |
| .map(|(wc, _)| wc.subst(self.tcx, &bound_vars)) |
| .filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect(); |
| |
| let value = chalk_solve::rust_ir::OpaqueTyDatumBound { |
| bounds: chalk_ir::Binders::new(binders, where_clauses), |
| }; |
| Arc::new(chalk_solve::rust_ir::OpaqueTyDatum { |
| opaque_ty_id, |
| bound: chalk_ir::Binders::new(chalk_ir::VariableKinds::new(&self.interner), value), |
| }) |
| } |
| |
| /// Since Chalk can't handle all Rust types currently, we have to handle |
| /// some specially for now. Over time, these `Some` returns will change to |
| /// `None` and eventually this function will be removed. |
| fn force_impl_for( |
| &self, |
| well_known: chalk_solve::rust_ir::WellKnownTrait, |
| ty: &chalk_ir::TyData<RustInterner<'tcx>>, |
| ) -> Option<bool> { |
| use chalk_ir::TyData::*; |
| match well_known { |
| chalk_solve::rust_ir::WellKnownTrait::Sized => match ty { |
| Apply(apply) => match apply.name { |
| chalk_ir::TypeName::Adt(chalk_ir::AdtId(adt_def)) => match adt_def.adt_kind() { |
| ty::AdtKind::Struct | ty::AdtKind::Union => None, |
| ty::AdtKind::Enum => { |
| let constraint = self.tcx.adt_sized_constraint(adt_def.did); |
| if constraint.0.len() > 0 { unimplemented!() } else { Some(true) } |
| } |
| }, |
| _ => None, |
| }, |
| Dyn(_) |
| | Alias(_) |
| | Placeholder(_) |
| | Function(_) |
| | InferenceVar(_, _) |
| | BoundVar(_) => None, |
| }, |
| chalk_solve::rust_ir::WellKnownTrait::Copy |
| | chalk_solve::rust_ir::WellKnownTrait::Clone => match ty { |
| Apply(apply) => match apply.name { |
| chalk_ir::TypeName::Adt(chalk_ir::AdtId(adt_def)) => match adt_def.adt_kind() { |
| ty::AdtKind::Struct | ty::AdtKind::Union => None, |
| ty::AdtKind::Enum => { |
| let constraint = self.tcx.adt_sized_constraint(adt_def.did); |
| if constraint.0.len() > 0 { unimplemented!() } else { Some(true) } |
| } |
| }, |
| _ => None, |
| }, |
| Dyn(_) |
| | Alias(_) |
| | Placeholder(_) |
| | Function(_) |
| | InferenceVar(_, _) |
| | BoundVar(_) => None, |
| }, |
| chalk_solve::rust_ir::WellKnownTrait::Drop => None, |
| chalk_solve::rust_ir::WellKnownTrait::Fn => None, |
| chalk_solve::rust_ir::WellKnownTrait::FnMut => None, |
| chalk_solve::rust_ir::WellKnownTrait::FnOnce => None, |
| chalk_solve::rust_ir::WellKnownTrait::Unsize => None, |
| } |
| } |
| |
| 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 def_id = match well_known_trait { |
| Sized => self.tcx.lang_items().sized_trait(), |
| Copy => self.tcx.lang_items().copy_trait(), |
| Clone => self.tcx.lang_items().clone_trait(), |
| Drop => self.tcx.lang_items().drop_trait(), |
| Fn => self.tcx.lang_items().fn_trait(), |
| FnMut => self.tcx.lang_items().fn_mut_trait(), |
| FnOnce => self.tcx.lang_items().fn_once_trait(), |
| Unsize => self.tcx.lang_items().unsize_trait(), |
| }; |
| def_id.map(|t| chalk_ir::TraitId(t)) |
| } |
| |
| fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool { |
| self.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.tcx.mk_ty(ty::Tuple(self.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.parameters(&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.parameters(&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.parameters(&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( |
| &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.parameters(&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.parameters(&self.interner)[0..substs.len(&self.interner) - 3]; |
| chalk_ir::Substitution::from(&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( |
| 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)) |
| } |
| }), |
| ) |
| } |
