580 lines
22 KiB
Rust
580 lines
22 KiB
Rust
//! This module contains the implementations of the `ToChalk` trait, which
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//! handles conversion between our data types and their corresponding types in
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//! Chalk (in both directions); plus some helper functions for more specialized
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//! conversions.
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use chalk_ir::{cast::Cast, fold::shift::Shift, interner::HasInterner, LifetimeData};
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use chalk_solve::rust_ir;
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use base_db::salsa::InternKey;
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use hir_def::{AssocContainerId, GenericDefId, Lookup, TypeAliasId};
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use crate::{
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db::HirDatabase,
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from_assoc_type_id,
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primitive::UintTy,
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traits::{Canonical, Obligation},
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AliasTy, CallableDefId, FnPointer, InEnvironment, OpaqueTy, ProjectionTy, Scalar, Substitution,
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TraitRef, Ty, WhereClause,
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};
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use super::interner::*;
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use super::*;
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impl ToChalk for Ty {
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type Chalk = chalk_ir::Ty<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Ty<Interner> {
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match self.into_inner() {
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TyKind::Ref(m, ty) => ref_to_chalk(db, m, ty),
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TyKind::Array(ty) => array_to_chalk(db, ty),
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TyKind::Function(FnPointer { sig, substs, .. }) => {
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let substitution = chalk_ir::FnSubst(substs.to_chalk(db).shifted_in(&Interner));
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chalk_ir::TyKind::Function(chalk_ir::FnPointer {
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num_binders: 0,
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sig,
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substitution,
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})
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.intern(&Interner)
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}
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TyKind::AssociatedType(assoc_type_id, substs) => {
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let substitution = substs.to_chalk(db);
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chalk_ir::TyKind::AssociatedType(assoc_type_id, substitution).intern(&Interner)
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}
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TyKind::OpaqueType(id, substs) => {
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let substitution = substs.to_chalk(db);
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chalk_ir::TyKind::OpaqueType(id, substitution).intern(&Interner)
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}
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TyKind::ForeignType(id) => chalk_ir::TyKind::Foreign(id).intern(&Interner),
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TyKind::Scalar(scalar) => chalk_ir::TyKind::Scalar(scalar).intern(&Interner),
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TyKind::Tuple(cardinality, substs) => {
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let substitution = substs.to_chalk(db);
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chalk_ir::TyKind::Tuple(cardinality, substitution).intern(&Interner)
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}
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TyKind::Raw(mutability, ty) => {
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let ty = ty.to_chalk(db);
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chalk_ir::TyKind::Raw(mutability, ty).intern(&Interner)
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}
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TyKind::Slice(ty) => chalk_ir::TyKind::Slice(ty.to_chalk(db)).intern(&Interner),
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TyKind::Str => chalk_ir::TyKind::Str.intern(&Interner),
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TyKind::FnDef(id, substs) => {
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let substitution = substs.to_chalk(db);
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chalk_ir::TyKind::FnDef(id, substitution).intern(&Interner)
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}
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TyKind::Never => chalk_ir::TyKind::Never.intern(&Interner),
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TyKind::Closure(closure_id, substs) => {
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let substitution = substs.to_chalk(db);
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chalk_ir::TyKind::Closure(closure_id, substitution).intern(&Interner)
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}
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TyKind::Adt(adt_id, substs) => {
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let substitution = substs.to_chalk(db);
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chalk_ir::TyKind::Adt(adt_id, substitution).intern(&Interner)
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}
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TyKind::Alias(AliasTy::Projection(proj_ty)) => {
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let associated_ty_id = proj_ty.associated_ty_id;
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let substitution = proj_ty.substitution.to_chalk(db);
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chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy {
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associated_ty_id,
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substitution,
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})
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.cast(&Interner)
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.intern(&Interner)
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}
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TyKind::Alias(AliasTy::Opaque(opaque_ty)) => {
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let opaque_ty_id = opaque_ty.opaque_ty_id;
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let substitution = opaque_ty.substitution.to_chalk(db);
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chalk_ir::AliasTy::Opaque(chalk_ir::OpaqueTy { opaque_ty_id, substitution })
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.cast(&Interner)
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.intern(&Interner)
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}
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TyKind::Placeholder(idx) => idx.to_ty::<Interner>(&Interner),
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TyKind::BoundVar(idx) => chalk_ir::TyKind::BoundVar(idx).intern(&Interner),
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TyKind::InferenceVar(..) => panic!("uncanonicalized infer ty"),
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TyKind::Dyn(predicates) => {
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let where_clauses = chalk_ir::QuantifiedWhereClauses::from_iter(
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&Interner,
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predicates.iter().filter(|p| !p.is_error()).cloned().map(|p| p.to_chalk(db)),
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);
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let bounded_ty = chalk_ir::DynTy {
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bounds: make_binders(where_clauses, 1),
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lifetime: LifetimeData::Static.intern(&Interner),
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};
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chalk_ir::TyKind::Dyn(bounded_ty).intern(&Interner)
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}
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TyKind::Unknown => chalk_ir::TyKind::Error.intern(&Interner),
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}
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}
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fn from_chalk(db: &dyn HirDatabase, chalk: chalk_ir::Ty<Interner>) -> Self {
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match chalk.data(&Interner).kind.clone() {
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chalk_ir::TyKind::Error => TyKind::Unknown,
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chalk_ir::TyKind::Array(ty, _size) => TyKind::Array(from_chalk(db, ty)),
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chalk_ir::TyKind::Placeholder(idx) => TyKind::Placeholder(idx),
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chalk_ir::TyKind::Alias(chalk_ir::AliasTy::Projection(proj)) => {
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let associated_ty = proj.associated_ty_id;
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let parameters = from_chalk(db, proj.substitution);
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TyKind::Alias(AliasTy::Projection(ProjectionTy {
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associated_ty_id: associated_ty,
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substitution: parameters,
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}))
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}
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chalk_ir::TyKind::Alias(chalk_ir::AliasTy::Opaque(opaque_ty)) => {
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let opaque_ty_id = opaque_ty.opaque_ty_id;
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let parameters = from_chalk(db, opaque_ty.substitution);
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TyKind::Alias(AliasTy::Opaque(OpaqueTy { opaque_ty_id, substitution: parameters }))
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}
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chalk_ir::TyKind::Function(chalk_ir::FnPointer {
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num_binders,
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sig,
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substitution,
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..
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}) => {
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assert_eq!(num_binders, 0);
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let substs: Substitution = from_chalk(
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db,
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substitution.0.shifted_out(&Interner).expect("fn ptr should have no binders"),
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);
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TyKind::Function(FnPointer { num_args: (substs.len() - 1), sig, substs })
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}
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chalk_ir::TyKind::BoundVar(idx) => TyKind::BoundVar(idx),
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chalk_ir::TyKind::InferenceVar(_iv, _kind) => TyKind::Unknown,
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chalk_ir::TyKind::Dyn(where_clauses) => {
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assert_eq!(where_clauses.bounds.binders.len(&Interner), 1);
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let predicates = where_clauses
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.bounds
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.skip_binders()
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.iter(&Interner)
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.map(|c| from_chalk(db, c.clone()))
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.collect();
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TyKind::Dyn(predicates)
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}
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chalk_ir::TyKind::Adt(adt_id, subst) => TyKind::Adt(adt_id, from_chalk(db, subst)),
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chalk_ir::TyKind::AssociatedType(type_id, subst) => {
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TyKind::AssociatedType(type_id, from_chalk(db, subst))
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}
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chalk_ir::TyKind::OpaqueType(opaque_type_id, subst) => {
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TyKind::OpaqueType(opaque_type_id, from_chalk(db, subst))
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}
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chalk_ir::TyKind::Scalar(scalar) => TyKind::Scalar(scalar),
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chalk_ir::TyKind::Tuple(cardinality, subst) => {
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TyKind::Tuple(cardinality, from_chalk(db, subst))
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}
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chalk_ir::TyKind::Raw(mutability, ty) => TyKind::Raw(mutability, from_chalk(db, ty)),
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chalk_ir::TyKind::Slice(ty) => TyKind::Slice(from_chalk(db, ty)),
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chalk_ir::TyKind::Ref(mutability, _lifetime, ty) => {
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TyKind::Ref(mutability, from_chalk(db, ty))
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}
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chalk_ir::TyKind::Str => TyKind::Str,
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chalk_ir::TyKind::Never => TyKind::Never,
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chalk_ir::TyKind::FnDef(fn_def_id, subst) => {
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TyKind::FnDef(fn_def_id, from_chalk(db, subst))
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}
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chalk_ir::TyKind::Closure(id, subst) => TyKind::Closure(id, from_chalk(db, subst)),
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chalk_ir::TyKind::Foreign(foreign_def_id) => TyKind::ForeignType(foreign_def_id),
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chalk_ir::TyKind::Generator(_, _) => unimplemented!(), // FIXME
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chalk_ir::TyKind::GeneratorWitness(_, _) => unimplemented!(), // FIXME
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}
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.intern(&Interner)
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}
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}
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/// We currently don't model lifetimes, but Chalk does. So, we have to insert a
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/// fake lifetime here, because Chalks built-in logic may expect it to be there.
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fn ref_to_chalk(
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db: &dyn HirDatabase,
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mutability: chalk_ir::Mutability,
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ty: Ty,
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) -> chalk_ir::Ty<Interner> {
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let arg = ty.to_chalk(db);
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let lifetime = LifetimeData::Static.intern(&Interner);
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chalk_ir::TyKind::Ref(mutability, lifetime, arg).intern(&Interner)
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}
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/// We currently don't model constants, but Chalk does. So, we have to insert a
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/// fake constant here, because Chalks built-in logic may expect it to be there.
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fn array_to_chalk(db: &dyn HirDatabase, ty: Ty) -> chalk_ir::Ty<Interner> {
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let arg = ty.to_chalk(db);
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let usize_ty = chalk_ir::TyKind::Scalar(Scalar::Uint(UintTy::Usize)).intern(&Interner);
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let const_ = chalk_ir::ConstData {
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ty: usize_ty,
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value: chalk_ir::ConstValue::Concrete(chalk_ir::ConcreteConst { interned: () }),
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}
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.intern(&Interner);
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chalk_ir::TyKind::Array(arg, const_).intern(&Interner)
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}
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impl ToChalk for Substitution {
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type Chalk = chalk_ir::Substitution<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Substitution<Interner> {
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chalk_ir::Substitution::from_iter(&Interner, self.iter().map(|ty| ty.clone().to_chalk(db)))
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}
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fn from_chalk(
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db: &dyn HirDatabase,
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parameters: chalk_ir::Substitution<Interner>,
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) -> Substitution {
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let tys = parameters
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.iter(&Interner)
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.map(|p| match p.ty(&Interner) {
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Some(ty) => from_chalk(db, ty.clone()),
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None => unimplemented!(),
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})
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.collect();
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Substitution(tys)
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}
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}
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impl ToChalk for TraitRef {
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type Chalk = chalk_ir::TraitRef<Interner>;
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fn to_chalk(self: TraitRef, db: &dyn HirDatabase) -> chalk_ir::TraitRef<Interner> {
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let trait_id = self.trait_id;
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let substitution = self.substitution.to_chalk(db);
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chalk_ir::TraitRef { trait_id, substitution }
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}
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fn from_chalk(db: &dyn HirDatabase, trait_ref: chalk_ir::TraitRef<Interner>) -> Self {
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let trait_id = trait_ref.trait_id;
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let substs = from_chalk(db, trait_ref.substitution);
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TraitRef { trait_id, substitution: substs }
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}
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}
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impl ToChalk for hir_def::TraitId {
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type Chalk = TraitId;
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fn to_chalk(self, _db: &dyn HirDatabase) -> TraitId {
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chalk_ir::TraitId(self.as_intern_id())
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}
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fn from_chalk(_db: &dyn HirDatabase, trait_id: TraitId) -> hir_def::TraitId {
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InternKey::from_intern_id(trait_id.0)
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}
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}
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impl ToChalk for hir_def::ImplId {
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type Chalk = ImplId;
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fn to_chalk(self, _db: &dyn HirDatabase) -> ImplId {
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chalk_ir::ImplId(self.as_intern_id())
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}
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fn from_chalk(_db: &dyn HirDatabase, impl_id: ImplId) -> hir_def::ImplId {
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InternKey::from_intern_id(impl_id.0)
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}
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}
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impl ToChalk for CallableDefId {
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type Chalk = FnDefId;
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fn to_chalk(self, db: &dyn HirDatabase) -> FnDefId {
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db.intern_callable_def(self).into()
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}
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fn from_chalk(db: &dyn HirDatabase, fn_def_id: FnDefId) -> CallableDefId {
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db.lookup_intern_callable_def(fn_def_id.into())
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}
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}
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pub(crate) struct TypeAliasAsValue(pub(crate) TypeAliasId);
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impl ToChalk for TypeAliasAsValue {
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type Chalk = AssociatedTyValueId;
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fn to_chalk(self, _db: &dyn HirDatabase) -> AssociatedTyValueId {
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rust_ir::AssociatedTyValueId(self.0.as_intern_id())
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}
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fn from_chalk(
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_db: &dyn HirDatabase,
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assoc_ty_value_id: AssociatedTyValueId,
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) -> TypeAliasAsValue {
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TypeAliasAsValue(TypeAliasId::from_intern_id(assoc_ty_value_id.0))
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}
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}
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impl ToChalk for WhereClause {
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type Chalk = chalk_ir::QuantifiedWhereClause<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::QuantifiedWhereClause<Interner> {
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match self {
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WhereClause::Implemented(trait_ref) => {
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let chalk_trait_ref = trait_ref.to_chalk(db);
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let chalk_trait_ref = chalk_trait_ref.shifted_in(&Interner);
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make_binders(chalk_ir::WhereClause::Implemented(chalk_trait_ref), 0)
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}
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WhereClause::AliasEq(alias_eq) => make_binders(
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chalk_ir::WhereClause::AliasEq(alias_eq.to_chalk(db).shifted_in(&Interner)),
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0,
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),
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WhereClause::Error => panic!("tried passing GenericPredicate::Error to Chalk"),
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}
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}
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fn from_chalk(
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db: &dyn HirDatabase,
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where_clause: chalk_ir::QuantifiedWhereClause<Interner>,
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) -> WhereClause {
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// we don't produce any where clauses with binders and can't currently deal with them
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match where_clause
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.skip_binders()
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.clone()
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.shifted_out(&Interner)
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.expect("unexpected bound vars in where clause")
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{
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chalk_ir::WhereClause::Implemented(tr) => WhereClause::Implemented(from_chalk(db, tr)),
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chalk_ir::WhereClause::AliasEq(alias_eq) => {
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WhereClause::AliasEq(from_chalk(db, alias_eq))
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}
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chalk_ir::WhereClause::LifetimeOutlives(_) => {
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// we shouldn't get these from Chalk
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panic!("encountered LifetimeOutlives from Chalk")
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}
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chalk_ir::WhereClause::TypeOutlives(_) => {
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// we shouldn't get these from Chalk
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panic!("encountered TypeOutlives from Chalk")
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}
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}
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}
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}
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impl ToChalk for ProjectionTy {
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type Chalk = chalk_ir::ProjectionTy<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::ProjectionTy<Interner> {
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chalk_ir::ProjectionTy {
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associated_ty_id: self.associated_ty_id,
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substitution: self.substitution.to_chalk(db),
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}
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}
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fn from_chalk(
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db: &dyn HirDatabase,
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projection_ty: chalk_ir::ProjectionTy<Interner>,
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) -> ProjectionTy {
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ProjectionTy {
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associated_ty_id: projection_ty.associated_ty_id,
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substitution: from_chalk(db, projection_ty.substitution),
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}
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}
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}
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impl ToChalk for OpaqueTy {
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type Chalk = chalk_ir::OpaqueTy<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> Self::Chalk {
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chalk_ir::OpaqueTy {
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opaque_ty_id: self.opaque_ty_id,
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substitution: self.substitution.to_chalk(db),
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}
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}
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fn from_chalk(db: &dyn HirDatabase, chalk: Self::Chalk) -> Self {
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OpaqueTy {
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opaque_ty_id: chalk.opaque_ty_id,
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substitution: from_chalk(db, chalk.substitution),
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}
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}
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}
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impl ToChalk for AliasTy {
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type Chalk = chalk_ir::AliasTy<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> Self::Chalk {
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match self {
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AliasTy::Projection(projection_ty) => {
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chalk_ir::AliasTy::Projection(projection_ty.to_chalk(db))
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}
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AliasTy::Opaque(opaque_ty) => chalk_ir::AliasTy::Opaque(opaque_ty.to_chalk(db)),
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}
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}
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fn from_chalk(db: &dyn HirDatabase, chalk: Self::Chalk) -> Self {
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match chalk {
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chalk_ir::AliasTy::Projection(projection_ty) => {
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AliasTy::Projection(from_chalk(db, projection_ty))
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}
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chalk_ir::AliasTy::Opaque(opaque_ty) => AliasTy::Opaque(from_chalk(db, opaque_ty)),
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}
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}
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}
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impl ToChalk for AliasEq {
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type Chalk = chalk_ir::AliasEq<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::AliasEq<Interner> {
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chalk_ir::AliasEq { alias: self.alias.to_chalk(db), ty: self.ty.to_chalk(db) }
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}
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fn from_chalk(db: &dyn HirDatabase, alias_eq: chalk_ir::AliasEq<Interner>) -> Self {
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AliasEq { alias: from_chalk(db, alias_eq.alias), ty: from_chalk(db, alias_eq.ty) }
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}
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}
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impl ToChalk for Obligation {
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type Chalk = chalk_ir::DomainGoal<Interner>;
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fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::DomainGoal<Interner> {
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match self {
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Obligation::Trait(tr) => tr.to_chalk(db).cast(&Interner),
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Obligation::AliasEq(alias_eq) => alias_eq.to_chalk(db).cast(&Interner),
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}
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}
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fn from_chalk(_db: &dyn HirDatabase, _goal: chalk_ir::DomainGoal<Interner>) -> Self {
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unimplemented!()
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}
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}
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impl<T> ToChalk for Canonical<T>
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where
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T: ToChalk,
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|
T::Chalk: HasInterner<Interner = Interner>,
|
|
{
|
|
type Chalk = chalk_ir::Canonical<T::Chalk>;
|
|
|
|
fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Canonical<T::Chalk> {
|
|
let kinds = self.kinds.iter().map(|&tk| {
|
|
chalk_ir::CanonicalVarKind::new(
|
|
chalk_ir::VariableKind::Ty(tk),
|
|
chalk_ir::UniverseIndex::ROOT,
|
|
)
|
|
});
|
|
let value = self.value.to_chalk(db);
|
|
chalk_ir::Canonical {
|
|
value,
|
|
binders: chalk_ir::CanonicalVarKinds::from_iter(&Interner, kinds),
|
|
}
|
|
}
|
|
|
|
fn from_chalk(db: &dyn HirDatabase, canonical: chalk_ir::Canonical<T::Chalk>) -> Canonical<T> {
|
|
let kinds = canonical
|
|
.binders
|
|
.iter(&Interner)
|
|
.map(|k| match k.kind {
|
|
chalk_ir::VariableKind::Ty(tk) => tk,
|
|
// HACK: Chalk can sometimes return new lifetime variables. We
|
|
// want to just skip them, but to not mess up the indices of
|
|
// other variables, we'll just create a new type variable in
|
|
// their place instead. This should not matter (we never see the
|
|
// actual *uses* of the lifetime variable).
|
|
chalk_ir::VariableKind::Lifetime => chalk_ir::TyVariableKind::General,
|
|
chalk_ir::VariableKind::Const(_) => panic!("unexpected const from Chalk"),
|
|
})
|
|
.collect();
|
|
Canonical { kinds, value: from_chalk(db, canonical.value) }
|
|
}
|
|
}
|
|
|
|
impl<T: ToChalk> ToChalk for InEnvironment<T>
|
|
where
|
|
T::Chalk: chalk_ir::interner::HasInterner<Interner = Interner>,
|
|
{
|
|
type Chalk = chalk_ir::InEnvironment<T::Chalk>;
|
|
|
|
fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::InEnvironment<T::Chalk> {
|
|
chalk_ir::InEnvironment {
|
|
environment: self.environment.env.clone(),
|
|
goal: self.value.to_chalk(db),
|
|
}
|
|
}
|
|
|
|
fn from_chalk(
|
|
_db: &dyn HirDatabase,
|
|
_in_env: chalk_ir::InEnvironment<T::Chalk>,
|
|
) -> InEnvironment<T> {
|
|
unimplemented!()
|
|
}
|
|
}
|
|
|
|
pub(super) fn make_binders<T>(value: T, num_vars: usize) -> chalk_ir::Binders<T>
|
|
where
|
|
T: HasInterner<Interner = Interner>,
|
|
{
|
|
chalk_ir::Binders::new(
|
|
chalk_ir::VariableKinds::from_iter(
|
|
&Interner,
|
|
std::iter::repeat(chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General))
|
|
.take(num_vars),
|
|
),
|
|
value,
|
|
)
|
|
}
|
|
|
|
pub(super) fn convert_where_clauses(
|
|
db: &dyn HirDatabase,
|
|
def: GenericDefId,
|
|
substs: &Substitution,
|
|
) -> Vec<chalk_ir::QuantifiedWhereClause<Interner>> {
|
|
let generic_predicates = db.generic_predicates(def);
|
|
let mut result = Vec::with_capacity(generic_predicates.len());
|
|
for pred in generic_predicates.iter() {
|
|
if pred.value.is_error() {
|
|
// skip errored predicates completely
|
|
continue;
|
|
}
|
|
result.push(pred.clone().subst(substs).to_chalk(db));
|
|
}
|
|
result
|
|
}
|
|
|
|
pub(super) fn generic_predicate_to_inline_bound(
|
|
db: &dyn HirDatabase,
|
|
pred: &WhereClause,
|
|
self_ty: &Ty,
|
|
) -> Option<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.
|
|
match pred {
|
|
WhereClause::Implemented(trait_ref) => {
|
|
if &trait_ref.substitution[0] != self_ty {
|
|
// 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[1..]
|
|
.iter()
|
|
.map(|ty| ty.clone().to_chalk(db).cast(&Interner))
|
|
.collect();
|
|
let trait_bound = rust_ir::TraitBound { trait_id: trait_ref.trait_id, args_no_self };
|
|
Some(rust_ir::InlineBound::TraitBound(trait_bound))
|
|
}
|
|
WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => {
|
|
if &projection_ty.substitution[0] != self_ty {
|
|
return None;
|
|
}
|
|
let trait_ = match from_assoc_type_id(projection_ty.associated_ty_id)
|
|
.lookup(db.upcast())
|
|
.container
|
|
{
|
|
AssocContainerId::TraitId(t) => t,
|
|
_ => panic!("associated type not in trait"),
|
|
};
|
|
let args_no_self = projection_ty.substitution[1..]
|
|
.iter()
|
|
.map(|ty| ty.clone().to_chalk(db).cast(&Interner))
|
|
.collect();
|
|
let alias_eq_bound = rust_ir::AliasEqBound {
|
|
value: ty.clone().to_chalk(db),
|
|
trait_bound: rust_ir::TraitBound { trait_id: trait_.to_chalk(db), args_no_self },
|
|
associated_ty_id: projection_ty.associated_ty_id,
|
|
parameters: Vec::new(), // FIXME we don't support generic associated types yet
|
|
};
|
|
Some(rust_ir::InlineBound::AliasEqBound(alias_eq_bound))
|
|
}
|
|
_ => None,
|
|
}
|
|
}
|