329 lines
12 KiB
Rust
329 lines
12 KiB
Rust
//! Conversion code from/to Chalk.
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use std::sync::Arc;
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use chalk_ir::{TypeId, ImplId, TypeKindId, ProjectionTy, Parameter, Identifier, cast::Cast, PlaceholderIndex, UniverseIndex, TypeName};
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use chalk_rust_ir::{AssociatedTyDatum, TraitDatum, StructDatum, ImplDatum};
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use ra_db::salsa::{InternId, InternKey};
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use crate::{
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Trait, HasGenericParams, ImplBlock,
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db::HirDatabase,
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ty::{TraitRef, Ty, ApplicationTy, TypeCtor, Substs},
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};
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use super::ChalkContext;
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pub(super) trait ToChalk {
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type Chalk;
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fn to_chalk(self, db: &impl HirDatabase) -> Self::Chalk;
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fn from_chalk(db: &impl HirDatabase, chalk: Self::Chalk) -> Self;
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}
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pub(super) fn from_chalk<T, ChalkT>(db: &impl HirDatabase, chalk: ChalkT) -> T
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where
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T: ToChalk<Chalk = ChalkT>,
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{
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T::from_chalk(db, chalk)
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}
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impl ToChalk for Ty {
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type Chalk = chalk_ir::Ty;
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fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Ty {
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match self {
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Ty::Apply(apply_ty) => chalk_ir::Ty::Apply(apply_ty.to_chalk(db)),
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Ty::Param { idx, .. } => {
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PlaceholderIndex { ui: UniverseIndex::ROOT, idx: idx as usize }.to_ty()
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}
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Ty::Bound(idx) => chalk_ir::Ty::BoundVar(idx as usize),
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Ty::Infer(_infer_ty) => panic!("uncanonicalized infer ty"),
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Ty::Unknown => unimplemented!(), // TODO turn into placeholder?
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}
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}
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fn from_chalk(db: &impl HirDatabase, chalk: chalk_ir::Ty) -> Self {
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match chalk {
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chalk_ir::Ty::Apply(apply_ty) => {
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match apply_ty.name {
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// FIXME handle TypeKindId::Trait/Type here
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TypeName::TypeKindId(_) => Ty::Apply(from_chalk(db, apply_ty)),
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TypeName::AssociatedType(_) => unimplemented!(),
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TypeName::Placeholder(idx) => {
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assert_eq!(idx.ui, UniverseIndex::ROOT);
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Ty::Param { idx: idx.idx as u32, name: crate::Name::missing() }
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}
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}
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}
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chalk_ir::Ty::Projection(_) => unimplemented!(),
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chalk_ir::Ty::UnselectedProjection(_) => unimplemented!(),
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chalk_ir::Ty::ForAll(_) => unimplemented!(),
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chalk_ir::Ty::BoundVar(idx) => Ty::Bound(idx as u32),
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chalk_ir::Ty::InferenceVar(_iv) => panic!("unexpected chalk infer ty"),
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}
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}
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}
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impl ToChalk for ApplicationTy {
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type Chalk = chalk_ir::ApplicationTy;
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fn to_chalk(self: ApplicationTy, db: &impl HirDatabase) -> chalk_ir::ApplicationTy {
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let struct_id = self.ctor.to_chalk(db);
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let name = TypeName::TypeKindId(struct_id.into());
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let parameters = self.parameters.to_chalk(db);
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chalk_ir::ApplicationTy { name, parameters }
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}
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fn from_chalk(db: &impl HirDatabase, apply_ty: chalk_ir::ApplicationTy) -> ApplicationTy {
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let ctor = match apply_ty.name {
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TypeName::TypeKindId(TypeKindId::StructId(struct_id)) => from_chalk(db, struct_id),
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TypeName::TypeKindId(_) => unimplemented!(),
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TypeName::Placeholder(_) => unimplemented!(),
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TypeName::AssociatedType(_) => unimplemented!(),
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};
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let parameters = from_chalk(db, apply_ty.parameters);
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ApplicationTy { ctor, parameters }
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}
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}
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impl ToChalk for Substs {
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type Chalk = Vec<chalk_ir::Parameter>;
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fn to_chalk(self, db: &impl HirDatabase) -> Vec<Parameter> {
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self.iter().map(|ty| ty.clone().to_chalk(db).cast()).collect()
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}
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fn from_chalk(db: &impl HirDatabase, parameters: Vec<chalk_ir::Parameter>) -> Substs {
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parameters
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.into_iter()
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.map(|p| match p {
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chalk_ir::Parameter(chalk_ir::ParameterKind::Ty(ty)) => from_chalk(db, ty),
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chalk_ir::Parameter(chalk_ir::ParameterKind::Lifetime(_)) => unimplemented!(),
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})
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.collect::<Vec<_>>()
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.into()
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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;
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fn to_chalk(self: TraitRef, db: &impl HirDatabase) -> chalk_ir::TraitRef {
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let trait_id = self.trait_.to_chalk(db);
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let parameters = self.substs.to_chalk(db);
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chalk_ir::TraitRef { trait_id, parameters }
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}
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fn from_chalk(db: &impl HirDatabase, trait_ref: chalk_ir::TraitRef) -> Self {
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let trait_ = from_chalk(db, trait_ref.trait_id);
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let substs = from_chalk(db, trait_ref.parameters);
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TraitRef { trait_, substs }
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}
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}
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impl ToChalk for Trait {
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type Chalk = chalk_ir::TraitId;
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fn to_chalk(self, _db: &impl HirDatabase) -> chalk_ir::TraitId {
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self.id.into()
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}
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fn from_chalk(_db: &impl HirDatabase, trait_id: chalk_ir::TraitId) -> Trait {
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Trait { id: trait_id.into() }
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}
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}
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impl ToChalk for TypeCtor {
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type Chalk = chalk_ir::StructId;
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fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::StructId {
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db.intern_type_ctor(self).into()
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}
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fn from_chalk(db: &impl HirDatabase, struct_id: chalk_ir::StructId) -> TypeCtor {
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db.lookup_intern_type_ctor(struct_id.into())
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}
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}
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impl ToChalk for ImplBlock {
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type Chalk = chalk_ir::ImplId;
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fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::ImplId {
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db.intern_impl_block(self).into()
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}
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fn from_chalk(db: &impl HirDatabase, impl_id: chalk_ir::ImplId) -> ImplBlock {
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db.lookup_intern_impl_block(impl_id.into())
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}
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}
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fn make_binders<T>(value: T, num_vars: usize) -> chalk_ir::Binders<T> {
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chalk_ir::Binders {
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value,
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binders: std::iter::repeat(chalk_ir::ParameterKind::Ty(())).take(num_vars).collect(),
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}
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}
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impl<'a, DB> chalk_solve::RustIrDatabase for ChalkContext<'a, DB>
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where
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DB: HirDatabase,
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{
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fn associated_ty_data(&self, _ty: TypeId) -> Arc<AssociatedTyDatum> {
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unimplemented!()
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}
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fn trait_datum(&self, trait_id: chalk_ir::TraitId) -> Arc<TraitDatum> {
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eprintln!("trait_datum {:?}", trait_id);
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let trait_: Trait = from_chalk(self.db, trait_id);
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let generic_params = trait_.generic_params(self.db);
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let bound_vars = Substs::bound_vars(&generic_params);
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let trait_ref = trait_.trait_ref(self.db).subst(&bound_vars).to_chalk(self.db);
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let flags = chalk_rust_ir::TraitFlags {
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// FIXME set these flags correctly
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auto: false,
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marker: false,
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upstream: trait_.module(self.db).krate(self.db) != Some(self.krate),
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fundamental: false,
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};
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let where_clauses = Vec::new(); // FIXME add where clauses
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let trait_datum_bound = chalk_rust_ir::TraitDatumBound { trait_ref, where_clauses, flags };
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let trait_datum = TraitDatum { binders: make_binders(trait_datum_bound, bound_vars.len()) };
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Arc::new(trait_datum)
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}
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fn struct_datum(&self, struct_id: chalk_ir::StructId) -> Arc<StructDatum> {
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eprintln!("struct_datum {:?}", struct_id);
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let type_ctor = from_chalk(self.db, struct_id);
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// TODO might be nicer if we can create a fake GenericParams for the TypeCtor
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let (num_params, upstream) = match type_ctor {
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TypeCtor::Bool
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| TypeCtor::Char
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| TypeCtor::Int(_)
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| TypeCtor::Float(_)
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| TypeCtor::Never
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| TypeCtor::Str => (0, true),
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TypeCtor::Slice | TypeCtor::Array | TypeCtor::RawPtr(_) | TypeCtor::Ref(_) => (1, true),
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TypeCtor::FnPtr | TypeCtor::Tuple => unimplemented!(), // FIXME tuples and FnPtr are currently variadic... we need to make the parameter number explicit
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TypeCtor::FnDef(_) => unimplemented!(),
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TypeCtor::Adt(adt) => {
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let generic_params = adt.generic_params(self.db);
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(
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generic_params.count_params_including_parent(),
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adt.krate(self.db) != Some(self.krate),
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)
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}
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};
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let flags = chalk_rust_ir::StructFlags {
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upstream,
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// FIXME set fundamental flag correctly
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fundamental: false,
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};
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let where_clauses = Vec::new(); // FIXME add where clauses
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let ty = ApplicationTy {
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ctor: type_ctor,
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parameters: (0..num_params).map(|i| Ty::Bound(i as u32)).collect::<Vec<_>>().into(),
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};
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let struct_datum_bound = chalk_rust_ir::StructDatumBound {
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self_ty: ty.to_chalk(self.db),
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fields: Vec::new(), // FIXME add fields (only relevant for auto traits)
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where_clauses,
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flags,
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};
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let struct_datum = StructDatum { binders: make_binders(struct_datum_bound, num_params) };
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Arc::new(struct_datum)
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}
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fn impl_datum(&self, impl_id: ImplId) -> Arc<ImplDatum> {
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eprintln!("impl_datum {:?}", impl_id);
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let impl_block: ImplBlock = from_chalk(self.db, impl_id);
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let generic_params = impl_block.generic_params(self.db);
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let bound_vars = Substs::bound_vars(&generic_params);
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let trait_ref = impl_block
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.target_trait_ref(self.db)
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.expect("FIXME handle unresolved impl block trait ref")
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.subst(&bound_vars);
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let impl_type = if impl_block.module().krate(self.db) == Some(self.krate) {
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chalk_rust_ir::ImplType::Local
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} else {
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chalk_rust_ir::ImplType::External
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};
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let impl_datum_bound = chalk_rust_ir::ImplDatumBound {
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// FIXME handle negative impls (impl !Sync for Foo)
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trait_ref: chalk_rust_ir::PolarizedTraitRef::Positive(trait_ref.to_chalk(self.db)),
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where_clauses: Vec::new(), // FIXME add where clauses
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associated_ty_values: Vec::new(), // FIXME add associated type values
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impl_type,
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};
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let impl_datum = ImplDatum { binders: make_binders(impl_datum_bound, bound_vars.len()) };
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Arc::new(impl_datum)
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}
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fn impls_for_trait(&self, trait_id: chalk_ir::TraitId) -> Vec<ImplId> {
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eprintln!("impls_for_trait {:?}", trait_id);
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let trait_ = from_chalk(self.db, trait_id);
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self.db
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.impls_for_trait(self.krate, trait_)
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.iter()
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// FIXME temporary hack -- as long as we're not lowering where clauses
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// correctly, ignore impls with them completely so as to not treat
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// impl<T> Trait for T where T: ... as a blanket impl on all types
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.filter(|impl_block| impl_block.generic_params(self.db).where_predicates.is_empty())
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.map(|impl_block| impl_block.to_chalk(self.db))
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.collect()
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}
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fn impl_provided_for(
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&self,
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auto_trait_id: chalk_ir::TraitId,
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struct_id: chalk_ir::StructId,
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) -> bool {
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eprintln!("impl_provided_for {:?}, {:?}", auto_trait_id, struct_id);
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false // FIXME
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}
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fn type_name(&self, _id: TypeKindId) -> Identifier {
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unimplemented!()
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}
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fn split_projection<'p>(
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&self,
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projection: &'p ProjectionTy,
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) -> (Arc<AssociatedTyDatum>, &'p [Parameter], &'p [Parameter]) {
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eprintln!("split_projection {:?}", projection);
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unimplemented!()
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}
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}
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fn id_from_chalk<T: InternKey>(chalk_id: chalk_ir::RawId) -> T {
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T::from_intern_id(InternId::from(chalk_id.index))
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}
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fn id_to_chalk<T: InternKey>(salsa_id: T) -> chalk_ir::RawId {
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chalk_ir::RawId { index: salsa_id.as_intern_id().as_u32() }
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}
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impl From<chalk_ir::TraitId> for crate::ids::TraitId {
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fn from(trait_id: chalk_ir::TraitId) -> Self {
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id_from_chalk(trait_id.0)
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}
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}
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impl From<crate::ids::TraitId> for chalk_ir::TraitId {
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fn from(trait_id: crate::ids::TraitId) -> Self {
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chalk_ir::TraitId(id_to_chalk(trait_id))
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}
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}
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impl From<chalk_ir::StructId> for crate::ids::TypeCtorId {
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fn from(struct_id: chalk_ir::StructId) -> Self {
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id_from_chalk(struct_id.0)
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}
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}
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impl From<crate::ids::TypeCtorId> for chalk_ir::StructId {
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fn from(type_ctor_id: crate::ids::TypeCtorId) -> Self {
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chalk_ir::StructId(id_to_chalk(type_ctor_id))
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}
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}
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impl From<chalk_ir::ImplId> for crate::ids::GlobalImplId {
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fn from(impl_id: chalk_ir::ImplId) -> Self {
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id_from_chalk(impl_id.0)
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}
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}
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impl From<crate::ids::GlobalImplId> for chalk_ir::ImplId {
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fn from(impl_id: crate::ids::GlobalImplId) -> Self {
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chalk_ir::ImplId(id_to_chalk(impl_id))
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}
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}
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