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|
//! Conversion code from/to Chalk.
use std::sync::Arc;
use log::debug;
use chalk_ir::{
cast::Cast, family::ChalkIr, Identifier, ImplId, Parameter, PlaceholderIndex, TypeId,
TypeKindId, TypeName, UniverseIndex,
};
use chalk_rust_ir::{AssociatedTyDatum, ImplDatum, StructDatum, TraitDatum};
use hir_expand::name;
use ra_db::salsa::{InternId, InternKey};
use super::{Canonical, ChalkContext, Impl, Obligation};
use crate::{
db::HirDatabase,
generics::{GenericDef, HasGenericParams},
ty::display::HirDisplay,
ty::{
ApplicationTy, GenericPredicate, Namespace, ProjectionTy, Substs, TraitRef, Ty, TypeCtor,
TypeWalk,
},
AssocItem, Crate, ImplBlock, Trait, TypeAlias,
};
/// This represents a trait whose name we could not resolve.
const UNKNOWN_TRAIT: chalk_ir::TraitId =
chalk_ir::TraitId(chalk_ir::RawId { index: u32::max_value() });
pub(super) trait ToChalk {
type Chalk;
fn to_chalk(self, db: &impl HirDatabase) -> Self::Chalk;
fn from_chalk(db: &impl HirDatabase, chalk: Self::Chalk) -> Self;
}
pub(super) fn from_chalk<T, ChalkT>(db: &impl HirDatabase, chalk: ChalkT) -> T
where
T: ToChalk<Chalk = ChalkT>,
{
T::from_chalk(db, chalk)
}
impl ToChalk for Ty {
type Chalk = chalk_ir::Ty<ChalkIr>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Ty<ChalkIr> {
match self {
Ty::Apply(apply_ty) => {
let name = match apply_ty.ctor {
TypeCtor::AssociatedType(type_alias) => {
let type_id = type_alias.to_chalk(db);
TypeName::AssociatedType(type_id)
}
_ => {
// other TypeCtors get interned and turned into a chalk StructId
let struct_id = apply_ty.ctor.to_chalk(db);
TypeName::TypeKindId(struct_id.into())
}
};
let parameters = apply_ty.parameters.to_chalk(db);
chalk_ir::ApplicationTy { name, parameters }.cast()
}
Ty::Projection(proj_ty) => {
let associated_ty_id = proj_ty.associated_ty.to_chalk(db);
let parameters = proj_ty.parameters.to_chalk(db);
chalk_ir::ProjectionTy { associated_ty_id, parameters }.cast()
}
Ty::Param { idx, .. } => {
PlaceholderIndex { ui: UniverseIndex::ROOT, idx: idx as usize }.to_ty::<ChalkIr>()
}
Ty::Bound(idx) => chalk_ir::Ty::BoundVar(idx as usize),
Ty::Infer(_infer_ty) => panic!("uncanonicalized infer ty"),
// FIXME use Chalk's Dyn/Opaque once the bugs with that are fixed
Ty::Unknown | Ty::Dyn(_) | Ty::Opaque(_) => {
let parameters = Vec::new();
let name = TypeName::Error;
chalk_ir::ApplicationTy { name, parameters }.cast()
}
}
}
fn from_chalk(db: &impl HirDatabase, chalk: chalk_ir::Ty<ChalkIr>) -> Self {
match chalk {
chalk_ir::Ty::Apply(apply_ty) => {
// FIXME this is kind of hacky due to the fact that
// TypeName::Placeholder is a Ty::Param on our side
match apply_ty.name {
TypeName::TypeKindId(TypeKindId::StructId(struct_id)) => {
let ctor = from_chalk(db, struct_id);
let parameters = from_chalk(db, apply_ty.parameters);
Ty::Apply(ApplicationTy { ctor, parameters })
}
TypeName::AssociatedType(type_id) => {
let ctor = TypeCtor::AssociatedType(from_chalk(db, type_id));
let parameters = from_chalk(db, apply_ty.parameters);
Ty::Apply(ApplicationTy { ctor, parameters })
}
TypeName::Error => Ty::Unknown,
// FIXME handle TypeKindId::Trait/Type here
TypeName::TypeKindId(_) => unimplemented!(),
TypeName::Placeholder(idx) => {
assert_eq!(idx.ui, UniverseIndex::ROOT);
Ty::Param { idx: idx.idx as u32, name: crate::Name::missing() }
}
}
}
chalk_ir::Ty::Projection(proj) => {
let associated_ty = from_chalk(db, proj.associated_ty_id);
let parameters = from_chalk(db, proj.parameters);
Ty::Projection(ProjectionTy { associated_ty, parameters })
}
chalk_ir::Ty::ForAll(_) => unimplemented!(),
chalk_ir::Ty::BoundVar(idx) => Ty::Bound(idx as u32),
chalk_ir::Ty::InferenceVar(_iv) => Ty::Unknown,
chalk_ir::Ty::Dyn(where_clauses) => {
assert_eq!(where_clauses.binders.len(), 1);
let predicates =
where_clauses.value.into_iter().map(|c| from_chalk(db, c)).collect();
Ty::Dyn(predicates)
}
chalk_ir::Ty::Opaque(where_clauses) => {
assert_eq!(where_clauses.binders.len(), 1);
let predicates =
where_clauses.value.into_iter().map(|c| from_chalk(db, c)).collect();
Ty::Opaque(predicates)
}
}
}
}
impl ToChalk for Substs {
type Chalk = Vec<chalk_ir::Parameter<ChalkIr>>;
fn to_chalk(self, db: &impl HirDatabase) -> Vec<Parameter<ChalkIr>> {
self.iter().map(|ty| ty.clone().to_chalk(db).cast()).collect()
}
fn from_chalk(db: &impl HirDatabase, parameters: Vec<chalk_ir::Parameter<ChalkIr>>) -> Substs {
let tys = parameters
.into_iter()
.map(|p| match p {
chalk_ir::Parameter(chalk_ir::ParameterKind::Ty(ty)) => from_chalk(db, ty),
chalk_ir::Parameter(chalk_ir::ParameterKind::Lifetime(_)) => unimplemented!(),
})
.collect();
Substs(tys)
}
}
impl ToChalk for TraitRef {
type Chalk = chalk_ir::TraitRef<ChalkIr>;
fn to_chalk(self: TraitRef, db: &impl HirDatabase) -> chalk_ir::TraitRef<ChalkIr> {
let trait_id = self.trait_.to_chalk(db);
let parameters = self.substs.to_chalk(db);
chalk_ir::TraitRef { trait_id, parameters }
}
fn from_chalk(db: &impl HirDatabase, trait_ref: chalk_ir::TraitRef<ChalkIr>) -> Self {
let trait_ = from_chalk(db, trait_ref.trait_id);
let substs = from_chalk(db, trait_ref.parameters);
TraitRef { trait_, substs }
}
}
impl ToChalk for Trait {
type Chalk = chalk_ir::TraitId;
fn to_chalk(self, _db: &impl HirDatabase) -> chalk_ir::TraitId {
chalk_ir::TraitId(id_to_chalk(self.id))
}
fn from_chalk(_db: &impl HirDatabase, trait_id: chalk_ir::TraitId) -> Trait {
Trait { id: id_from_chalk(trait_id.0) }
}
}
impl ToChalk for TypeCtor {
type Chalk = chalk_ir::StructId;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::StructId {
db.intern_type_ctor(self).into()
}
fn from_chalk(db: &impl HirDatabase, struct_id: chalk_ir::StructId) -> TypeCtor {
db.lookup_intern_type_ctor(struct_id.into())
}
}
impl ToChalk for Impl {
type Chalk = chalk_ir::ImplId;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::ImplId {
db.intern_impl(self).into()
}
fn from_chalk(db: &impl HirDatabase, impl_id: chalk_ir::ImplId) -> Impl {
db.lookup_intern_impl(impl_id.into())
}
}
impl ToChalk for TypeAlias {
type Chalk = chalk_ir::TypeId;
fn to_chalk(self, _db: &impl HirDatabase) -> chalk_ir::TypeId {
chalk_ir::TypeId(id_to_chalk(self.id))
}
fn from_chalk(_db: &impl HirDatabase, type_alias_id: chalk_ir::TypeId) -> TypeAlias {
TypeAlias { id: id_from_chalk(type_alias_id.0) }
}
}
impl ToChalk for GenericPredicate {
type Chalk = chalk_ir::QuantifiedWhereClause<ChalkIr>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::QuantifiedWhereClause<ChalkIr> {
match self {
GenericPredicate::Implemented(trait_ref) => {
make_binders(chalk_ir::WhereClause::Implemented(trait_ref.to_chalk(db)), 0)
}
GenericPredicate::Projection(projection_pred) => make_binders(
chalk_ir::WhereClause::ProjectionEq(chalk_ir::ProjectionEq {
projection: projection_pred.projection_ty.to_chalk(db),
ty: projection_pred.ty.to_chalk(db),
}),
0,
),
GenericPredicate::Error => {
let impossible_trait_ref = chalk_ir::TraitRef {
trait_id: UNKNOWN_TRAIT,
parameters: vec![Ty::Unknown.to_chalk(db).cast()],
};
make_binders(chalk_ir::WhereClause::Implemented(impossible_trait_ref), 0)
}
}
}
fn from_chalk(
db: &impl HirDatabase,
where_clause: chalk_ir::QuantifiedWhereClause<ChalkIr>,
) -> GenericPredicate {
match where_clause.value {
chalk_ir::WhereClause::Implemented(tr) => {
if tr.trait_id == UNKNOWN_TRAIT {
// FIXME we need an Error enum on the Chalk side to avoid this
return GenericPredicate::Error;
}
GenericPredicate::Implemented(from_chalk(db, tr))
}
chalk_ir::WhereClause::ProjectionEq(projection_eq) => {
let projection_ty = from_chalk(db, projection_eq.projection);
let ty = from_chalk(db, projection_eq.ty);
GenericPredicate::Projection(super::ProjectionPredicate { projection_ty, ty })
}
}
}
}
impl ToChalk for ProjectionTy {
type Chalk = chalk_ir::ProjectionTy<ChalkIr>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::ProjectionTy<ChalkIr> {
chalk_ir::ProjectionTy {
associated_ty_id: self.associated_ty.to_chalk(db),
parameters: self.parameters.to_chalk(db),
}
}
fn from_chalk(
db: &impl HirDatabase,
projection_ty: chalk_ir::ProjectionTy<ChalkIr>,
) -> ProjectionTy {
ProjectionTy {
associated_ty: from_chalk(db, projection_ty.associated_ty_id),
parameters: from_chalk(db, projection_ty.parameters),
}
}
}
impl ToChalk for super::ProjectionPredicate {
type Chalk = chalk_ir::Normalize<ChalkIr>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Normalize<ChalkIr> {
chalk_ir::Normalize {
projection: self.projection_ty.to_chalk(db),
ty: self.ty.to_chalk(db),
}
}
fn from_chalk(_db: &impl HirDatabase, _normalize: chalk_ir::Normalize<ChalkIr>) -> Self {
unimplemented!()
}
}
impl ToChalk for Obligation {
type Chalk = chalk_ir::DomainGoal<ChalkIr>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::DomainGoal<ChalkIr> {
match self {
Obligation::Trait(tr) => tr.to_chalk(db).cast(),
Obligation::Projection(pr) => pr.to_chalk(db).cast(),
}
}
fn from_chalk(_db: &impl HirDatabase, _goal: chalk_ir::DomainGoal<ChalkIr>) -> Self {
unimplemented!()
}
}
impl<T> ToChalk for Canonical<T>
where
T: ToChalk,
{
type Chalk = chalk_ir::Canonical<T::Chalk>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Canonical<T::Chalk> {
let parameter = chalk_ir::ParameterKind::Ty(chalk_ir::UniverseIndex::ROOT);
let value = self.value.to_chalk(db);
let canonical = chalk_ir::Canonical { value, binders: vec![parameter; self.num_vars] };
canonical
}
fn from_chalk(db: &impl HirDatabase, canonical: chalk_ir::Canonical<T::Chalk>) -> Canonical<T> {
Canonical { num_vars: canonical.binders.len(), value: from_chalk(db, canonical.value) }
}
}
impl ToChalk for Arc<super::TraitEnvironment> {
type Chalk = chalk_ir::Environment<ChalkIr>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Environment<ChalkIr> {
let mut clauses = Vec::new();
for pred in &self.predicates {
if pred.is_error() {
// for env, we just ignore errors
continue;
}
let program_clause: chalk_ir::ProgramClause<ChalkIr> = pred.clone().to_chalk(db).cast();
clauses.push(program_clause.into_from_env_clause());
}
chalk_ir::Environment::new().add_clauses(clauses)
}
fn from_chalk(
_db: &impl HirDatabase,
_env: chalk_ir::Environment<ChalkIr>,
) -> Arc<super::TraitEnvironment> {
unimplemented!()
}
}
impl<T: ToChalk> ToChalk for super::InEnvironment<T>
where
T::Chalk: chalk_ir::family::HasTypeFamily<TypeFamily = ChalkIr>,
{
type Chalk = chalk_ir::InEnvironment<T::Chalk>;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::InEnvironment<T::Chalk> {
chalk_ir::InEnvironment {
environment: self.environment.to_chalk(db),
goal: self.value.to_chalk(db),
}
}
fn from_chalk(
db: &impl HirDatabase,
in_env: chalk_ir::InEnvironment<T::Chalk>,
) -> super::InEnvironment<T> {
super::InEnvironment {
environment: from_chalk(db, in_env.environment),
value: from_chalk(db, in_env.goal),
}
}
}
fn make_binders<T>(value: T, num_vars: usize) -> chalk_ir::Binders<T> {
chalk_ir::Binders {
value,
binders: std::iter::repeat(chalk_ir::ParameterKind::Ty(())).take(num_vars).collect(),
}
}
fn convert_where_clauses(
db: &impl HirDatabase,
def: GenericDef,
substs: &Substs,
) -> Vec<chalk_ir::QuantifiedWhereClause<ChalkIr>> {
let generic_predicates = db.generic_predicates(def);
let mut result = Vec::with_capacity(generic_predicates.len());
for pred in generic_predicates.iter() {
if pred.is_error() {
// HACK: Return just the single predicate (which is always false
// anyway), otherwise Chalk can easily get into slow situations
return vec![pred.clone().subst(substs).to_chalk(db)];
}
result.push(pred.clone().subst(substs).to_chalk(db));
}
result
}
impl<'a, DB> chalk_solve::RustIrDatabase for ChalkContext<'a, DB>
where
DB: HirDatabase,
{
fn associated_ty_data(&self, id: TypeId) -> Arc<AssociatedTyDatum> {
self.db.associated_ty_data(id)
}
fn trait_datum(&self, trait_id: chalk_ir::TraitId) -> Arc<TraitDatum> {
self.db.trait_datum(self.krate, trait_id)
}
fn struct_datum(&self, struct_id: chalk_ir::StructId) -> Arc<StructDatum> {
self.db.struct_datum(self.krate, struct_id)
}
fn impl_datum(&self, impl_id: ImplId) -> Arc<ImplDatum> {
self.db.impl_datum(self.krate, impl_id)
}
fn impls_for_trait(
&self,
trait_id: chalk_ir::TraitId,
parameters: &[Parameter<ChalkIr>],
) -> Vec<ImplId> {
debug!("impls_for_trait {:?}", trait_id);
if trait_id == UNKNOWN_TRAIT {
return Vec::new();
}
let trait_: Trait = from_chalk(self.db, trait_id);
let mut result: Vec<_> = self
.db
.impls_for_trait(self.krate, trait_)
.iter()
.copied()
.map(Impl::ImplBlock)
.map(|impl_| impl_.to_chalk(self.db))
.collect();
let ty: Ty = from_chalk(self.db, parameters[0].assert_ty_ref().clone());
if let Ty::Apply(ApplicationTy { ctor: TypeCtor::Closure { def, expr }, .. }) = ty {
for &fn_trait in
[super::FnTrait::FnOnce, super::FnTrait::FnMut, super::FnTrait::Fn].iter()
{
if let Some(actual_trait) = get_fn_trait(self.db, self.krate, fn_trait) {
if trait_ == actual_trait {
let impl_ = super::ClosureFnTraitImplData { def, expr, fn_trait };
result.push(Impl::ClosureFnTraitImpl(impl_).to_chalk(self.db));
}
}
}
}
debug!("impls_for_trait returned {} impls", result.len());
result
}
fn impl_provided_for(
&self,
auto_trait_id: chalk_ir::TraitId,
struct_id: chalk_ir::StructId,
) -> bool {
debug!("impl_provided_for {:?}, {:?}", auto_trait_id, struct_id);
false // FIXME
}
fn type_name(&self, _id: TypeKindId) -> Identifier {
unimplemented!()
}
fn split_projection<'p>(
&self,
projection: &'p chalk_ir::ProjectionTy<ChalkIr>,
) -> (Arc<AssociatedTyDatum>, &'p [Parameter<ChalkIr>], &'p [Parameter<ChalkIr>]) {
debug!("split_projection {:?}", projection);
// we don't support GATs, so I think this should always be correct currently
(self.db.associated_ty_data(projection.associated_ty_id), &projection.parameters, &[])
}
fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<ChalkIr>> {
vec![]
}
fn local_impls_to_coherence_check(
&self,
_trait_id: chalk_ir::TraitId,
) -> Vec<chalk_ir::ImplId> {
// We don't do coherence checking (yet)
unimplemented!()
}
}
pub(crate) fn associated_ty_data_query(
db: &impl HirDatabase,
id: TypeId,
) -> Arc<AssociatedTyDatum> {
debug!("associated_ty_data {:?}", id);
let type_alias: TypeAlias = from_chalk(db, id);
let trait_ = match type_alias.container(db) {
Some(crate::Container::Trait(t)) => t,
_ => panic!("associated type not in trait"),
};
let generic_params = type_alias.generic_params(db);
let parameter_kinds = generic_params
.params_including_parent()
.into_iter()
.map(|p| chalk_ir::ParameterKind::Ty(lalrpop_intern::intern(&p.name.to_string())))
.collect();
let datum = AssociatedTyDatum {
trait_id: trait_.to_chalk(db),
id,
name: lalrpop_intern::intern(&type_alias.name(db).to_string()),
parameter_kinds,
// FIXME add bounds and where clauses
bounds: vec![],
where_clauses: vec![],
};
Arc::new(datum)
}
pub(crate) fn trait_datum_query(
db: &impl HirDatabase,
krate: Crate,
trait_id: chalk_ir::TraitId,
) -> Arc<TraitDatum> {
debug!("trait_datum {:?}", trait_id);
if trait_id == UNKNOWN_TRAIT {
let trait_datum_bound = chalk_rust_ir::TraitDatumBound {
trait_ref: chalk_ir::TraitRef {
trait_id: UNKNOWN_TRAIT,
parameters: vec![chalk_ir::Ty::BoundVar(0).cast()],
},
associated_ty_ids: Vec::new(),
where_clauses: Vec::new(),
};
let flags = chalk_rust_ir::TraitFlags {
auto: false,
marker: false,
upstream: true,
fundamental: false,
non_enumerable: true,
};
return Arc::new(TraitDatum { binders: make_binders(trait_datum_bound, 1), flags });
}
let trait_: Trait = from_chalk(db, trait_id);
debug!("trait {:?} = {:?}", trait_id, trait_.name(db));
let generic_params = trait_.generic_params(db);
let bound_vars = Substs::bound_vars(&generic_params);
let trait_ref = trait_.trait_ref(db).subst(&bound_vars).to_chalk(db);
let flags = chalk_rust_ir::TraitFlags {
auto: trait_.is_auto(db),
upstream: trait_.module(db).krate() != krate,
non_enumerable: true,
// FIXME set these flags correctly
marker: false,
fundamental: false,
};
let where_clauses = convert_where_clauses(db, trait_.into(), &bound_vars);
let associated_ty_ids = trait_
.items(db)
.into_iter()
.filter_map(|trait_item| match trait_item {
crate::AssocItem::TypeAlias(type_alias) => Some(type_alias),
_ => None,
})
.map(|type_alias| type_alias.to_chalk(db))
.collect();
let trait_datum_bound =
chalk_rust_ir::TraitDatumBound { trait_ref, where_clauses, associated_ty_ids };
let trait_datum =
TraitDatum { binders: make_binders(trait_datum_bound, bound_vars.len()), flags };
Arc::new(trait_datum)
}
pub(crate) fn struct_datum_query(
db: &impl HirDatabase,
krate: Crate,
struct_id: chalk_ir::StructId,
) -> Arc<StructDatum> {
debug!("struct_datum {:?}", struct_id);
let type_ctor: TypeCtor = from_chalk(db, struct_id);
debug!("struct {:?} = {:?}", struct_id, type_ctor);
let num_params = type_ctor.num_ty_params(db);
let upstream = type_ctor.krate(db) != Some(krate);
let where_clauses = type_ctor
.as_generic_def()
.map(|generic_def| {
let generic_params = generic_def.generic_params(db);
let bound_vars = Substs::bound_vars(&generic_params);
convert_where_clauses(db, generic_def, &bound_vars)
})
.unwrap_or_else(Vec::new);
let flags = chalk_rust_ir::StructFlags {
upstream,
// FIXME set fundamental flag correctly
fundamental: false,
};
let self_ty = chalk_ir::ApplicationTy {
name: TypeName::TypeKindId(type_ctor.to_chalk(db).into()),
parameters: (0..num_params).map(|i| chalk_ir::Ty::BoundVar(i).cast()).collect(),
};
let struct_datum_bound = chalk_rust_ir::StructDatumBound {
self_ty,
fields: Vec::new(), // FIXME add fields (only relevant for auto traits)
where_clauses,
flags,
};
let struct_datum = StructDatum { binders: make_binders(struct_datum_bound, num_params) };
Arc::new(struct_datum)
}
pub(crate) fn impl_datum_query(
db: &impl HirDatabase,
krate: Crate,
impl_id: ImplId,
) -> Arc<ImplDatum> {
let _p = ra_prof::profile("impl_datum");
debug!("impl_datum {:?}", impl_id);
let impl_: Impl = from_chalk(db, impl_id);
match impl_ {
Impl::ImplBlock(impl_block) => impl_block_datum(db, krate, impl_id, impl_block),
Impl::ClosureFnTraitImpl(data) => {
closure_fn_trait_impl_datum(db, krate, impl_id, data).unwrap_or_else(invalid_impl_datum)
}
}
}
fn impl_block_datum(
db: &impl HirDatabase,
krate: Crate,
impl_id: ImplId,
impl_block: ImplBlock,
) -> Arc<ImplDatum> {
let generic_params = impl_block.generic_params(db);
let bound_vars = Substs::bound_vars(&generic_params);
let trait_ref = impl_block
.target_trait_ref(db)
.expect("FIXME handle unresolved impl block trait ref")
.subst(&bound_vars);
let impl_type = if impl_block.module().krate() == krate {
chalk_rust_ir::ImplType::Local
} else {
chalk_rust_ir::ImplType::External
};
let where_clauses = convert_where_clauses(db, impl_block.into(), &bound_vars);
let negative = impl_block.is_negative(db);
debug!(
"impl {:?}: {}{} where {:?}",
impl_id,
if negative { "!" } else { "" },
trait_ref.display(db),
where_clauses
);
let trait_ = trait_ref.trait_;
let trait_ref = trait_ref.to_chalk(db);
let associated_ty_values = impl_block
.items(db)
.into_iter()
.filter_map(|item| match item {
AssocItem::TypeAlias(t) => Some(t),
_ => None,
})
.filter_map(|t| {
let assoc_ty = trait_.associated_type_by_name(db, &t.name(db))?;
let ty = db.type_for_def(t.into(), Namespace::Types).subst(&bound_vars);
Some(chalk_rust_ir::AssociatedTyValue {
impl_id,
associated_ty_id: assoc_ty.to_chalk(db),
value: chalk_ir::Binders {
value: chalk_rust_ir::AssociatedTyValueBound { ty: ty.to_chalk(db) },
binders: vec![], // we don't support GATs yet
},
})
})
.collect();
let polarity = if negative {
chalk_rust_ir::Polarity::Negative
} else {
chalk_rust_ir::Polarity::Positive
};
let impl_datum_bound =
chalk_rust_ir::ImplDatumBound { trait_ref, where_clauses, associated_ty_values };
debug!("impl_datum: {:?}", impl_datum_bound);
let impl_datum = ImplDatum {
binders: make_binders(impl_datum_bound, bound_vars.len()),
impl_type,
polarity,
};
Arc::new(impl_datum)
}
fn invalid_impl_datum() -> Arc<ImplDatum> {
let trait_ref = chalk_ir::TraitRef {
trait_id: UNKNOWN_TRAIT,
parameters: vec![chalk_ir::Ty::BoundVar(0).cast()],
};
let impl_datum_bound = chalk_rust_ir::ImplDatumBound {
trait_ref,
where_clauses: Vec::new(),
associated_ty_values: Vec::new(),
};
let impl_datum = ImplDatum {
binders: make_binders(impl_datum_bound, 1),
impl_type: chalk_rust_ir::ImplType::External,
polarity: chalk_rust_ir::Polarity::Positive,
};
Arc::new(impl_datum)
}
fn closure_fn_trait_impl_datum(
db: &impl HirDatabase,
krate: Crate,
impl_id: ImplId,
data: super::ClosureFnTraitImplData,
) -> Option<Arc<ImplDatum>> {
// for some closure |X, Y| -> Z:
// impl<T, U, V> Fn<(T, U)> for closure<fn(T, U) -> V> { Output = V }
let fn_once_trait = get_fn_trait(db, krate, super::FnTrait::FnOnce)?;
let trait_ = get_fn_trait(db, krate, data.fn_trait)?; // get corresponding fn trait
let num_args: u16 = match &db.body_hir(data.def)[data.expr] {
crate::expr::Expr::Lambda { args, .. } => args.len() as u16,
_ => {
log::warn!("closure for closure type {:?} not found", data);
0
}
};
let arg_ty = Ty::apply(
TypeCtor::Tuple { cardinality: num_args },
Substs::builder(num_args as usize).fill_with_bound_vars(0).build(),
);
let output_ty = Ty::Bound(num_args.into());
let sig_ty = Ty::apply(
TypeCtor::FnPtr { num_args },
Substs::builder(num_args as usize + 1).fill_with_bound_vars(0).build(),
);
let self_ty = Ty::apply_one(TypeCtor::Closure { def: data.def, expr: data.expr }, sig_ty);
let trait_ref = TraitRef {
trait_,
substs: Substs::build_for_def(db, trait_).push(self_ty).push(arg_ty).build(),
};
let output_ty_id = fn_once_trait.associated_type_by_name(db, &name::OUTPUT_TYPE)?;
let output_ty_value = chalk_rust_ir::AssociatedTyValue {
associated_ty_id: output_ty_id.to_chalk(db),
impl_id,
value: make_binders(
chalk_rust_ir::AssociatedTyValueBound { ty: output_ty.to_chalk(db) },
0,
),
};
let impl_type = chalk_rust_ir::ImplType::External;
let impl_datum_bound = chalk_rust_ir::ImplDatumBound {
trait_ref: trait_ref.to_chalk(db),
where_clauses: Vec::new(),
associated_ty_values: vec![output_ty_value],
};
let impl_datum = ImplDatum {
binders: make_binders(impl_datum_bound, num_args as usize + 1),
impl_type,
polarity: chalk_rust_ir::Polarity::Positive,
};
Some(Arc::new(impl_datum))
}
fn get_fn_trait(db: &impl HirDatabase, krate: Crate, fn_trait: super::FnTrait) -> Option<Trait> {
let target = db.lang_item(krate, fn_trait.lang_item_name().into())?;
match target {
crate::lang_item::LangItemTarget::Trait(t) => Some(t),
_ => None,
}
}
fn id_from_chalk<T: InternKey>(chalk_id: chalk_ir::RawId) -> T {
T::from_intern_id(InternId::from(chalk_id.index))
}
fn id_to_chalk<T: InternKey>(salsa_id: T) -> chalk_ir::RawId {
chalk_ir::RawId { index: salsa_id.as_intern_id().as_u32() }
}
impl From<chalk_ir::StructId> for crate::ids::TypeCtorId {
fn from(struct_id: chalk_ir::StructId) -> Self {
id_from_chalk(struct_id.0)
}
}
impl From<crate::ids::TypeCtorId> for chalk_ir::StructId {
fn from(type_ctor_id: crate::ids::TypeCtorId) -> Self {
chalk_ir::StructId(id_to_chalk(type_ctor_id))
}
}
impl From<chalk_ir::ImplId> for crate::ids::GlobalImplId {
fn from(impl_id: chalk_ir::ImplId) -> Self {
id_from_chalk(impl_id.0)
}
}
impl From<crate::ids::GlobalImplId> for chalk_ir::ImplId {
fn from(impl_id: crate::ids::GlobalImplId) -> Self {
chalk_ir::ImplId(id_to_chalk(impl_id))
}
}
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