diff options
Diffstat (limited to 'compiler/rustc_traits/src/chalk/db.rs')
| -rw-r--r-- | compiler/rustc_traits/src/chalk/db.rs | 792 |
1 files changed, 0 insertions, 792 deletions
diff --git a/compiler/rustc_traits/src/chalk/db.rs b/compiler/rustc_traits/src/chalk/db.rs deleted file mode 100644 index c319b2e31..000000000 --- a/compiler/rustc_traits/src/chalk/db.rs +++ /dev/null @@ -1,792 +0,0 @@ -//! 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::{self, AssocKind, Ty, TyCtxt, TypeFoldable, TypeSuperFoldable}; -use rustc_middle::ty::{InternalSubsts, SubstsRef}; -use rustc_target::abi::{Integer, IntegerType}; - -use rustc_ast::ast; - -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(crate) interner: RustInterner<'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>>> { - self.interner - .tcx - .predicates_defined_on(def_id) - .instantiate_own(self.interner.tcx, bound_vars) - .filter_map(|(wc, _)| LowerInto::lower_into(wc, self.interner)) - .collect() - } - - fn bounds_for<T>(&self, def_id: DefId, bound_vars: SubstsRef<'tcx>) -> Vec<T> - where - ty::Predicate<'tcx>: LowerInto<'tcx, std::option::Option<T>>, - { - self.interner - .tcx - .explicit_item_bounds(def_id) - .subst_iter_copied(self.interner.tcx, &bound_vars) - .filter_map(|(bound, _)| LowerInto::<Option<_>>::lower_into(bound, 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 Some(trait_def_id) = assoc_item.trait_container(self.interner.tcx) else { - 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 where_clauses = self.where_clauses_for(def_id, bound_vars); - let bounds = self.bounds_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, where_clauses }, - ), - }) - } - - fn trait_datum( - &self, - trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, - ) -> Arc<chalk_solve::rust_ir::TraitDatum<RustInterner<'tcx>>> { - use chalk_solve::rust_ir::WellKnownTrait::*; - - 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 lang_items = self.interner.tcx.lang_items(); - let well_known = if lang_items.sized_trait() == Some(def_id) { - Some(Sized) - } else if lang_items.copy_trait() == Some(def_id) { - Some(Copy) - } else if lang_items.clone_trait() == Some(def_id) { - Some(Clone) - } else if lang_items.drop_trait() == Some(def_id) { - Some(Drop) - } else if lang_items.fn_trait() == Some(def_id) { - Some(Fn) - } else if lang_items.fn_once_trait() == Some(def_id) { - Some(FnOnce) - } else if lang_items.fn_mut_trait() == Some(def_id) { - Some(FnMut) - } else if lang_items.unsize_trait() == Some(def_id) { - Some(Unsize) - } else if lang_items.unpin_trait() == Some(def_id) { - Some(Unpin) - } else if lang_items.coerce_unsized_trait() == Some(def_id) { - Some(CoerceUnsized) - } else if lang_items.dispatch_from_dyn_trait() == Some(def_id) { - Some(DispatchFromDyn) - } else if lang_items.tuple_trait() == Some(def_id) { - Some(Tuple) - } 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>>, - ) -> Arc<chalk_solve::rust_ir::AdtRepr<RustInterner<'tcx>>> { - let adt_def = adt_id.0; - let int = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Int(i)).intern(self.interner); - let uint = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Uint(i)).intern(self.interner); - Arc::new(chalk_solve::rust_ir::AdtRepr { - c: adt_def.repr().c(), - packed: adt_def.repr().packed(), - int: adt_def.repr().int.map(|i| match i { - IntegerType::Pointer(true) => int(chalk_ir::IntTy::Isize), - IntegerType::Pointer(false) => uint(chalk_ir::UintTy::Usize), - IntegerType::Fixed(i, true) => match i { - Integer::I8 => int(chalk_ir::IntTy::I8), - Integer::I16 => int(chalk_ir::IntTy::I16), - Integer::I32 => int(chalk_ir::IntTy::I32), - Integer::I64 => int(chalk_ir::IntTy::I64), - Integer::I128 => int(chalk_ir::IntTy::I128), - }, - IntegerType::Fixed(i, false) => match i { - Integer::I8 => uint(chalk_ir::UintTy::U8), - Integer::I16 => uint(chalk_ir::UintTy::U16), - Integer::I32 => uint(chalk_ir::UintTy::U32), - Integer::I64 => uint(chalk_ir::UintTy::U64), - Integer::I128 => uint(chalk_ir::UintTy::U128), - }, - }), - }) - } - - fn adt_size_align( - &self, - adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, - ) -> Arc<chalk_solve::rust_ir::AdtSizeAlign> { - let tcx = self.interner.tcx; - let did = adt_id.0.did(); - - // Grab the ADT and the param we might need to calculate its layout - let param_env = tcx.param_env(did); - let adt_ty = tcx.type_of(did).subst_identity(); - - // The ADT is a 1-zst if it's a ZST and its alignment is 1. - // Mark the ADT as _not_ a 1-zst if there was a layout error. - let one_zst = if let Ok(layout) = tcx.layout_of(param_env.and(adt_ty)) { - layout.is_zst() && layout.align.abi.bytes() == 1 - } else { - false - }; - - Arc::new(chalk_solve::rust_ir::AdtSizeAlign::from_one_zst(one_zst)) - } - - 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.map_bound(|s| s.inputs_and_output()).subst(self.interner.tcx, bound_vars), - ); - - let argument_types = inputs_and_output[..inputs_and_output.len() - 1] - .iter() - .map(|t| sig.rebind(*t).subst(self.interner.tcx, &bound_vars).lower_into(self.interner)) - .collect(); - - let return_type = sig - .rebind(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.0.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 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, - }; - - let associated_ty_value_ids: Vec<_> = self - .interner - .tcx - .associated_items(def_id) - .in_definition_order() - .filter(|i| i.kind == AssocKind::Type) - .map(|i| chalk_solve::rust_ir::AssociatedTyValueId(i.def_id)) - .collect(); - - Arc::new(chalk_solve::rust_ir::ImplDatum { - polarity: self.interner.tcx.impl_polarity(def_id).lower_into(self.interner), - binders: chalk_ir::Binders::new(binders, value), - impl_type: chalk_solve::rust_ir::ImplType::Local, - associated_ty_value_ids, - }) - } - - 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.map_bound(|t| t.self_ty()); - let self_ty = self_ty.subst(self.interner.tcx, bound_vars); - let lowered_ty = self_ty.lower_into(self.interner); - - parameters[0].assert_ty_ref(self.interner).could_match( - self.interner, - self.unification_database(), - &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>>, - chalk_ty: &chalk_ir::TyKind<RustInterner<'tcx>>, - ) -> bool { - use chalk_ir::Scalar::*; - use chalk_ir::TyKind::*; - - 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().subst_identity(); - let self_ty = trait_ref.self_ty(); - let provides = match (self_ty.kind(), chalk_ty) { - (&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))) => matches!( - (ty1, ty2), - (ty::IntTy::Isize, chalk_ir::IntTy::Isize) - | (ty::IntTy::I8, chalk_ir::IntTy::I8) - | (ty::IntTy::I16, chalk_ir::IntTy::I16) - | (ty::IntTy::I32, chalk_ir::IntTy::I32) - | (ty::IntTy::I64, chalk_ir::IntTy::I64) - | (ty::IntTy::I128, chalk_ir::IntTy::I128) - ), - (ty::Uint(ty1), Scalar(Uint(ty2))) => matches!( - (ty1, ty2), - (ty::UintTy::Usize, chalk_ir::UintTy::Usize) - | (ty::UintTy::U8, chalk_ir::UintTy::U8) - | (ty::UintTy::U16, chalk_ir::UintTy::U16) - | (ty::UintTy::U32, chalk_ir::UintTy::U32) - | (ty::UintTy::U64, chalk_ir::UintTy::U64) - | (ty::UintTy::U128, chalk_ir::UintTy::U128) - ), - (ty::Float(ty1), Scalar(Float(ty2))) => matches!( - (ty1, ty2), - (ty::FloatTy::F32, chalk_ir::FloatTy::F32) - | (ty::FloatTy::F64, chalk_ir::FloatTy::F64) - ), - (&ty::Tuple(substs), Tuple(len, _)) => substs.len() == *len, - (&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::Alias(ty::Opaque, ty::AliasTy { 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 = assoc_item.container_id(self.interner.tcx); - match assoc_item.kind { - AssocKind::Type => {} - _ => unimplemented!("Not possible??"), - } - - let trait_item_id = assoc_item.trait_item_def_id.expect("assoc_ty with no trait version"); - 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) - .subst(self.interner.tcx, bound_vars) - .lower_into(self.interner); - - Arc::new(chalk_solve::rust_ir::AssociatedTyValue { - impl_id: chalk_ir::ImplId(impl_id), - associated_ty_id: chalk_ir::AssocTypeId(trait_item_id), - value: chalk_ir::Binders::new( - binders, - chalk_solve::rust_ir::AssociatedTyValueBound { ty }, - ), - }) - } - - 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 = ty::fold::shift_vars( - self.interner.tcx, - bound_vars_for_item(self.interner.tcx, opaque_ty_id.0), - 1, - ); - let where_clauses = self.where_clauses_for(opaque_ty_id.0, bound_vars); - - let identity_substs = InternalSubsts::identity_for_item(self.interner.tcx, opaque_ty_id.0); - - let explicit_item_bounds = self.interner.tcx.explicit_item_bounds(opaque_ty_id.0); - let bounds = - explicit_item_bounds - .subst_iter_copied(self.interner.tcx, &bound_vars) - .map(|(bound, _)| { - bound.fold_with(&mut ReplaceOpaqueTyFolder { - tcx: self.interner.tcx, - opaque_ty_id, - identity_substs, - binder_index: ty::INNERMOST, - }) - }) - .filter_map(|bound| { - LowerInto::< - Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> - >::lower_into(bound, self.interner) - }) - .collect(); - - // Binder for the bound variable representing the concrete impl Trait type. - let existential_binder = chalk_ir::VariableKinds::from1( - self.interner, - chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General), - ); - - let value = chalk_solve::rust_ir::OpaqueTyDatumBound { - bounds: chalk_ir::Binders::new(existential_binder.clone(), bounds), - where_clauses: chalk_ir::Binders::new(existential_binder, where_clauses), - }; - - let binders = binders_for(self.interner, bound_vars); - Arc::new(chalk_solve::rust_ir::OpaqueTyDatum { - opaque_ty_id, - bound: chalk_ir::Binders::new(binders, 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(), - Generator => lang_items.gen_trait(), - Unsize => lang_items.unsize_trait(), - Unpin => lang_items.unpin_trait(), - CoerceUnsized => lang_items.coerce_unsized_trait(), - DiscriminantKind => lang_items.discriminant_kind_trait(), - DispatchFromDyn => lang_items.dispatch_from_dyn_trait(), - Tuple => lang_items.tuple_trait(), - }; - def_id.map(chalk_ir::TraitId) - } - - fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool { - self.interner.tcx.check_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.types.unit.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).kind(self.interner) { - chalk_ir::TyKind::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"), - } - } - - 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).kind(self.interner) { - chalk_ir::TyKind::Function(f) => { - let substitution = f.substitution.0.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.kind(self.interner) { - chalk_ir::TyKind::Tuple(_len, substitution) => substitution - .iter(self.interner) - .map(|arg| arg.assert_ty_ref(self.interner)) - .cloned() - .collect(), - _ => 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) - } - - fn generator_datum( - &self, - _generator_id: chalk_ir::GeneratorId<RustInterner<'tcx>>, - ) -> Arc<chalk_solve::rust_ir::GeneratorDatum<RustInterner<'tcx>>> { - unimplemented!() - } - - fn generator_witness_datum( - &self, - _generator_id: chalk_ir::GeneratorId<RustInterner<'tcx>>, - ) -> Arc<chalk_solve::rust_ir::GeneratorWitnessDatum<RustInterner<'tcx>>> { - unimplemented!() - } - - fn unification_database(&self) -> &dyn chalk_ir::UnificationDatabase<RustInterner<'tcx>> { - self - } - - fn discriminant_type( - &self, - _: chalk_ir::Ty<RustInterner<'tcx>>, - ) -> chalk_ir::Ty<RustInterner<'tcx>> { - unimplemented!() - } -} - -impl<'tcx> chalk_ir::UnificationDatabase<RustInterner<'tcx>> for RustIrDatabase<'tcx> { - fn fn_def_variance( - &self, - def_id: chalk_ir::FnDefId<RustInterner<'tcx>>, - ) -> chalk_ir::Variances<RustInterner<'tcx>> { - let variances = self.interner.tcx.variances_of(def_id.0); - chalk_ir::Variances::from_iter( - self.interner, - variances.iter().map(|v| v.lower_into(self.interner)), - ) - } - - fn adt_variance( - &self, - adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, - ) -> chalk_ir::Variances<RustInterner<'tcx>> { - let variances = self.interner.tcx.variances_of(adt_id.0.did()); - chalk_ir::Variances::from_iter( - self.interner, - variances.iter().map(|v| v.lower_into(self.interner)), - ) - } -} - -/// Creates an `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 `BoundRegionKind::BrNamed` -/// variant (which has a `DefId`). -fn bound_vars_for_item(tcx: TyCtxt<'_>, def_id: DefId) -> SubstsRef<'_> { - InternalSubsts::for_item(tcx, def_id, |param, substs| match param.kind { - ty::GenericParamDefKind::Type { .. } => tcx - .mk_bound( - ty::INNERMOST, - ty::BoundTy { - var: ty::BoundVar::from(param.index), - kind: ty::BoundTyKind::Param(param.def_id, param.name), - }, - ) - .into(), - - ty::GenericParamDefKind::Lifetime => { - let br = ty::BoundRegion { - var: ty::BoundVar::from_usize(substs.len()), - kind: ty::BrAnon(None), - }; - tcx.mk_re_late_bound(ty::INNERMOST, br).into() - } - - ty::GenericParamDefKind::Const { .. } => tcx - .mk_const( - ty::ConstKind::Bound(ty::INNERMOST, ty::BoundVar::from(param.index)), - tcx.type_of(param.def_id).subst_identity(), - ) - .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::TyVariableKind::General) - } - ty::subst::GenericArgKind::Const(c) => { - chalk_ir::VariableKind::Const(c.ty().lower_into(interner)) - } - }), - ) -} - -struct ReplaceOpaqueTyFolder<'tcx> { - tcx: TyCtxt<'tcx>, - opaque_ty_id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>, - identity_substs: SubstsRef<'tcx>, - binder_index: ty::DebruijnIndex, -} - -impl<'tcx> ty::TypeFolder<TyCtxt<'tcx>> for ReplaceOpaqueTyFolder<'tcx> { - fn interner(&self) -> TyCtxt<'tcx> { - self.tcx - } - - fn fold_binder<T: TypeFoldable<TyCtxt<'tcx>>>( - &mut self, - t: ty::Binder<'tcx, T>, - ) -> ty::Binder<'tcx, T> { - self.binder_index.shift_in(1); - let t = t.super_fold_with(self); - self.binder_index.shift_out(1); - t - } - - fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> { - if let ty::Alias(ty::Opaque, ty::AliasTy { def_id, substs, .. }) = *ty.kind() { - if def_id == self.opaque_ty_id.0 && substs == self.identity_substs { - return self - .tcx - .mk_bound(self.binder_index, ty::BoundTy::from(ty::BoundVar::from_u32(0))); - } - } - ty - } -} |