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Move type lowering methods to TyLoweringContext

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This commit is contained in:
Florian Diebold 2021-03-13 22:44:36 +01:00
parent d3ca2ab959
commit 3743ede404
5 changed files with 249 additions and 289 deletions
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6
crates/hir/src/lib.rs
View file

@ -802,7 +802,7 @@ impl Function {
let krate = self.id.lookup(db.upcast()).container.module(db.upcast()).krate();
let ret_type = &db.function_data(self.id).ret_type;
let ctx = hir_ty::TyLoweringContext::new(db, &resolver);
let ty = Ty::from_hir_ext(&ctx, ret_type).0;
let ty = ctx.lower_ty(ret_type);
Type::new_with_resolver_inner(db, krate, &resolver, ty)
}
@ -825,7 +825,7 @@ impl Function {
let ty = Type {
krate,
ty: InEnvironment {
value: Ty::from_hir_ext(&ctx, type_ref).0,
value: ctx.lower_ty(type_ref),
environment: environment.clone(),
},
};
@ -1499,7 +1499,7 @@ impl Impl {
let resolver = self.id.resolver(db.upcast());
let krate = self.id.lookup(db.upcast()).container.krate();
let ctx = hir_ty::TyLoweringContext::new(db, &resolver);
let ty = Ty::from_hir(&ctx, &impl_data.target_type);
let ty = ctx.lower_ty(&impl_data.target_type);
Type::new_with_resolver_inner(db, krate, &resolver, ty)
}

10
crates/hir_ty/src/infer.rs
View file

@ -294,7 +294,7 @@ impl<'a> InferenceContext<'a> {
// FIXME use right resolver for block
let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver)
.with_impl_trait_mode(impl_trait_mode);
let ty = Ty::from_hir(&ctx, type_ref);
let ty = ctx.lower_ty(type_ref);
let ty = self.insert_type_vars(ty);
self.normalize_associated_types_in(ty)
}
@ -437,19 +437,19 @@ impl<'a> InferenceContext<'a> {
};
return match resolution {
TypeNs::AdtId(AdtId::StructId(strukt)) => {
let substs = Ty::substs_from_path(&ctx, path, strukt.into(), true);
let substs = ctx.substs_from_path(path, strukt.into(), true);
let ty = self.db.ty(strukt.into());
let ty = self.insert_type_vars(ty.subst(&substs));
forbid_unresolved_segments((ty, Some(strukt.into())), unresolved)
}
TypeNs::AdtId(AdtId::UnionId(u)) => {
let substs = Ty::substs_from_path(&ctx, path, u.into(), true);
let substs = ctx.substs_from_path(path, u.into(), true);
let ty = self.db.ty(u.into());
let ty = self.insert_type_vars(ty.subst(&substs));
forbid_unresolved_segments((ty, Some(u.into())), unresolved)
}
TypeNs::EnumVariantId(var) => {
let substs = Ty::substs_from_path(&ctx, path, var.into(), true);
let substs = ctx.substs_from_path(path, var.into(), true);
let ty = self.db.ty(var.parent.into());
let ty = self.insert_type_vars(ty.subst(&substs));
forbid_unresolved_segments((ty, Some(var.into())), unresolved)
@ -541,7 +541,7 @@ impl<'a> InferenceContext<'a> {
let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver)
.with_impl_trait_mode(ImplTraitLoweringMode::Param);
let param_tys =
data.params.iter().map(|type_ref| Ty::from_hir(&ctx, type_ref)).collect::<Vec<_>>();
data.params.iter().map(|type_ref| ctx.lower_ty(type_ref)).collect::<Vec<_>>();
for (ty, pat) in param_tys.into_iter().zip(body.params.iter()) {
let ty = self.insert_type_vars(ty);
let ty = self.normalize_associated_types_in(ty);

10
crates/hir_ty/src/infer/path.rs
View file

@ -40,7 +40,7 @@ impl<'a> InferenceContext<'a> {
let ty = self.make_ty(type_ref);
let remaining_segments_for_ty = path.segments().take(path.segments().len() - 1);
let ctx = crate::lower::TyLoweringContext::new(self.db, &resolver);
let (ty, _) = Ty::from_type_relative_path(&ctx, ty, None, remaining_segments_for_ty);
let (ty, _) = ctx.lower_ty_relative_path(ty, None, remaining_segments_for_ty);
self.resolve_ty_assoc_item(
ty,
&path.segments().last().expect("path had at least one segment").name,
@ -96,7 +96,7 @@ impl<'a> InferenceContext<'a> {
// self_subst is just for the parent
let parent_substs = self_subst.unwrap_or_else(Substs::empty);
let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver);
let substs = Ty::substs_from_path(&ctx, path, typable, true);
let substs = ctx.substs_from_path(path, typable, true);
let full_substs = Substs::builder(substs.len())
.use_parent_substs(&parent_substs)
.fill(substs.0[parent_substs.len()..].iter().cloned())
@ -126,7 +126,8 @@ impl<'a> InferenceContext<'a> {
let segment =
remaining_segments.last().expect("there should be at least one segment here");
let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver);
let trait_ref = TraitRef::from_resolved_path(&ctx, trait_, resolved_segment, None);
let trait_ref =
ctx.lower_trait_ref_from_resolved_path(trait_, resolved_segment, None);
self.resolve_trait_assoc_item(trait_ref, segment, id)
}
(def, _) => {
@ -137,8 +138,7 @@ impl<'a> InferenceContext<'a> {
let remaining_segments_for_ty =
remaining_segments.take(remaining_segments.len() - 1);
let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver);
let (ty, _) = Ty::from_partly_resolved_hir_path(
&ctx,
let (ty, _) = ctx.lower_partly_resolved_path(
def,
resolved_segment,
remaining_segments_for_ty,

510
crates/hir_ty/src/lower.rs
View file

@ -140,44 +140,45 @@ pub enum TypeParamLoweringMode {
Variable,
}
impl Ty {
pub fn from_hir(ctx: &TyLoweringContext<'_>, type_ref: &TypeRef) -> Self {
Ty::from_hir_ext(ctx, type_ref).0
impl<'a> TyLoweringContext<'a> {
pub fn lower_ty(&self, type_ref: &TypeRef) -> Ty {
self.lower_ty_ext(type_ref).0
}
pub fn from_hir_ext(ctx: &TyLoweringContext<'_>, type_ref: &TypeRef) -> (Self, Option<TypeNs>) {
fn lower_ty_ext(&self, type_ref: &TypeRef) -> (Ty, Option<TypeNs>) {
let mut res = None;
let ty = match type_ref {
TypeRef::Never => TyKind::Never.intern(&Interner),
TypeRef::Tuple(inner) => {
let inner_tys: Arc<[Ty]> = inner.iter().map(|tr| Ty::from_hir(ctx, tr)).collect();
let inner_tys: Arc<[Ty]> = inner.iter().map(|tr| self.lower_ty(tr)).collect();
TyKind::Tuple(inner_tys.len(), Substs(inner_tys)).intern(&Interner)
}
TypeRef::Path(path) => {
let (ty, res_) = Ty::from_hir_path(ctx, path);
let (ty, res_) = self.lower_path(path);
res = res_;
ty
}
TypeRef::RawPtr(inner, mutability) => {
let inner_ty = Ty::from_hir(ctx, inner);
let inner_ty = self.lower_ty(inner);
TyKind::Raw(lower_to_chalk_mutability(*mutability), Substs::single(inner_ty))
.intern(&Interner)
}
TypeRef::Array(inner) => {
let inner_ty = Ty::from_hir(ctx, inner);
let inner_ty = self.lower_ty(inner);
TyKind::Array(Substs::single(inner_ty)).intern(&Interner)
}
TypeRef::Slice(inner) => {
let inner_ty = Ty::from_hir(ctx, inner);
let inner_ty = self.lower_ty(inner);
TyKind::Slice(Substs::single(inner_ty)).intern(&Interner)
}
TypeRef::Reference(inner, _, mutability) => {
let inner_ty = Ty::from_hir(ctx, inner);
let inner_ty = self.lower_ty(inner);
TyKind::Ref(lower_to_chalk_mutability(*mutability), Substs::single(inner_ty))
.intern(&Interner)
}
TypeRef::Placeholder => TyKind::Unknown.intern(&Interner),
TypeRef::Fn(params, is_varargs) => {
let substs = Substs(params.iter().map(|tr| Ty::from_hir(ctx, tr)).collect());
let substs = Substs(params.iter().map(|tr| self.lower_ty(tr)).collect());
TyKind::Function(FnPointer {
num_args: substs.len() - 1,
sig: FnSig { variadic: *is_varargs },
@ -188,25 +189,22 @@ impl Ty {
TypeRef::DynTrait(bounds) => {
let self_ty =
TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0)).intern(&Interner);
let predicates = ctx.with_shifted_in(DebruijnIndex::ONE, |ctx| {
bounds
.iter()
.flat_map(|b| GenericPredicate::from_type_bound(ctx, b, self_ty.clone()))
.collect()
let predicates = self.with_shifted_in(DebruijnIndex::ONE, |ctx| {
bounds.iter().flat_map(|b| ctx.lower_type_bound(b, self_ty.clone())).collect()
});
TyKind::Dyn(predicates).intern(&Interner)
}
TypeRef::ImplTrait(bounds) => {
match ctx.impl_trait_mode {
match self.impl_trait_mode {
ImplTraitLoweringMode::Opaque => {
let idx = ctx.impl_trait_counter.get();
ctx.impl_trait_counter.set(idx + 1);
let idx = self.impl_trait_counter.get();
self.impl_trait_counter.set(idx + 1);
assert!(idx as usize == ctx.opaque_type_data.borrow().len());
assert!(idx as usize == self.opaque_type_data.borrow().len());
// this dance is to make sure the data is in the right
// place even if we encounter more opaque types while
// lowering the bounds
ctx.opaque_type_data
self.opaque_type_data
.borrow_mut()
.push(ReturnTypeImplTrait { bounds: Binders::new(1, Vec::new()) });
// We don't want to lower the bounds inside the binders
@ -218,29 +216,29 @@ impl Ty {
// other, but separately. So if the `T` refers to a type
// parameter of the outer function, it's just one binder
// away instead of two.
let actual_opaque_type_data = ctx
let actual_opaque_type_data = self
.with_debruijn(DebruijnIndex::INNERMOST, |ctx| {
ReturnTypeImplTrait::from_hir(ctx, &bounds)
ctx.lower_impl_trait(&bounds)
});
ctx.opaque_type_data.borrow_mut()[idx as usize] = actual_opaque_type_data;
self.opaque_type_data.borrow_mut()[idx as usize] = actual_opaque_type_data;
let func = match ctx.resolver.generic_def() {
let func = match self.resolver.generic_def() {
Some(GenericDefId::FunctionId(f)) => f,
_ => panic!("opaque impl trait lowering in non-function"),
};
let impl_trait_id = ImplTraitId::ReturnTypeImplTrait(func, idx);
let opaque_ty_id = ctx.db.intern_impl_trait_id(impl_trait_id).into();
let generics = generics(ctx.db.upcast(), func.into());
let parameters = Substs::bound_vars(&generics, ctx.in_binders);
let opaque_ty_id = self.db.intern_impl_trait_id(impl_trait_id).into();
let generics = generics(self.db.upcast(), func.into());
let parameters = Substs::bound_vars(&generics, self.in_binders);
TyKind::Alias(AliasTy::Opaque(OpaqueTy { opaque_ty_id, parameters }))
.intern(&Interner)
}
ImplTraitLoweringMode::Param => {
let idx = ctx.impl_trait_counter.get();
let idx = self.impl_trait_counter.get();
// FIXME we're probably doing something wrong here
ctx.impl_trait_counter.set(idx + count_impl_traits(type_ref) as u16);
if let Some(def) = ctx.resolver.generic_def() {
let generics = generics(ctx.db.upcast(), def);
self.impl_trait_counter.set(idx + count_impl_traits(type_ref) as u16);
if let Some(def) = self.resolver.generic_def() {
let generics = generics(self.db.upcast(), def);
let param = generics
.iter()
.filter(|(_, data)| {
@ -248,7 +246,7 @@ impl Ty {
})
.nth(idx as usize)
.map_or(TyKind::Unknown, |(id, _)| {
TyKind::Placeholder(to_placeholder_idx(ctx.db, id))
TyKind::Placeholder(to_placeholder_idx(self.db, id))
});
param.intern(&Interner)
} else {
@ -256,18 +254,18 @@ impl Ty {
}
}
ImplTraitLoweringMode::Variable => {
let idx = ctx.impl_trait_counter.get();
let idx = self.impl_trait_counter.get();
// FIXME we're probably doing something wrong here
ctx.impl_trait_counter.set(idx + count_impl_traits(type_ref) as u16);
self.impl_trait_counter.set(idx + count_impl_traits(type_ref) as u16);
let (parent_params, self_params, list_params, _impl_trait_params) =
if let Some(def) = ctx.resolver.generic_def() {
let generics = generics(ctx.db.upcast(), def);
if let Some(def) = self.resolver.generic_def() {
let generics = generics(self.db.upcast(), def);
generics.provenance_split()
} else {
(0, 0, 0, 0)
};
TyKind::BoundVar(BoundVar::new(
ctx.in_binders,
self.in_binders,
idx as usize + parent_params + self_params + list_params,
))
.intern(&Interner)
@ -286,7 +284,7 @@ impl Ty {
/// This is only for `generic_predicates_for_param`, where we can't just
/// lower the self types of the predicates since that could lead to cycles.
/// So we just check here if the `type_ref` resolves to a generic param, and which.
fn from_hir_only_param(ctx: &TyLoweringContext<'_>, type_ref: &TypeRef) -> Option<TypeParamId> {
fn lower_ty_only_param(&self, type_ref: &TypeRef) -> Option<TypeParamId> {
let path = match type_ref {
TypeRef::Path(path) => path,
_ => return None,
@ -298,7 +296,7 @@ impl Ty {
return None;
}
let resolution =
match ctx.resolver.resolve_path_in_type_ns(ctx.db.upcast(), path.mod_path()) {
match self.resolver.resolve_path_in_type_ns(self.db.upcast(), path.mod_path()) {
Some((it, None)) => it,
_ => return None,
};
@ -309,8 +307,8 @@ impl Ty {
}
}
pub(crate) fn from_type_relative_path(
ctx: &TyLoweringContext<'_>,
pub(crate) fn lower_ty_relative_path(
&self,
ty: Ty,
// We need the original resolution to lower `Self::AssocTy` correctly
res: Option<TypeNs>,
@ -319,7 +317,7 @@ impl Ty {
if remaining_segments.len() == 1 {
// resolve unselected assoc types
let segment = remaining_segments.first().unwrap();
(Ty::select_associated_type(ctx, res, segment), None)
(self.select_associated_type(res, segment), None)
} else if remaining_segments.len() > 1 {
// FIXME report error (ambiguous associated type)
(TyKind::Unknown.intern(&Interner), None)
@ -328,8 +326,8 @@ impl Ty {
}
}
pub(crate) fn from_partly_resolved_hir_path(
ctx: &TyLoweringContext<'_>,
pub(crate) fn lower_partly_resolved_path(
&self,
resolution: TypeNs,
resolved_segment: PathSegment<'_>,
remaining_segments: PathSegments<'_>,
@ -347,11 +345,11 @@ impl Ty {
None
};
let trait_ref =
TraitRef::from_resolved_path(ctx, trait_, resolved_segment, self_ty);
self.lower_trait_ref_from_resolved_path(trait_, resolved_segment, self_ty);
let ty = if remaining_segments.len() == 1 {
let segment = remaining_segments.first().unwrap();
let found = associated_type_by_name_including_super_traits(
ctx.db,
self.db,
trait_ref,
&segment.name,
);
@ -380,68 +378,66 @@ impl Ty {
}
TypeNs::GenericParam(param_id) => {
let generics = generics(
ctx.db.upcast(),
ctx.resolver.generic_def().expect("generics in scope"),
self.db.upcast(),
self.resolver.generic_def().expect("generics in scope"),
);
match ctx.type_param_mode {
match self.type_param_mode {
TypeParamLoweringMode::Placeholder => {
TyKind::Placeholder(to_placeholder_idx(ctx.db, param_id))
TyKind::Placeholder(to_placeholder_idx(self.db, param_id))
}
TypeParamLoweringMode::Variable => {
let idx = generics.param_idx(param_id).expect("matching generics");
TyKind::BoundVar(BoundVar::new(ctx.in_binders, idx))
TyKind::BoundVar(BoundVar::new(self.in_binders, idx))
}
}
.intern(&Interner)
}
TypeNs::SelfType(impl_id) => {
let generics = generics(ctx.db.upcast(), impl_id.into());
let substs = match ctx.type_param_mode {
let generics = generics(self.db.upcast(), impl_id.into());
let substs = match self.type_param_mode {
TypeParamLoweringMode::Placeholder => {
Substs::type_params_for_generics(ctx.db, &generics)
Substs::type_params_for_generics(self.db, &generics)
}
TypeParamLoweringMode::Variable => {
Substs::bound_vars(&generics, ctx.in_binders)
Substs::bound_vars(&generics, self.in_binders)
}
};
ctx.db.impl_self_ty(impl_id).subst(&substs)
self.db.impl_self_ty(impl_id).subst(&substs)
}
TypeNs::AdtSelfType(adt) => {
let generics = generics(ctx.db.upcast(), adt.into());
let substs = match ctx.type_param_mode {
let generics = generics(self.db.upcast(), adt.into());
let substs = match self.type_param_mode {
TypeParamLoweringMode::Placeholder => {
Substs::type_params_for_generics(ctx.db, &generics)
Substs::type_params_for_generics(self.db, &generics)
}
TypeParamLoweringMode::Variable => {
Substs::bound_vars(&generics, ctx.in_binders)
Substs::bound_vars(&generics, self.in_binders)
}
};
ctx.db.ty(adt.into()).subst(&substs)
self.db.ty(adt.into()).subst(&substs)
}
TypeNs::AdtId(it) => {
Ty::from_hir_path_inner(ctx, resolved_segment, it.into(), infer_args)
}
TypeNs::AdtId(it) => self.lower_path_inner(resolved_segment, it.into(), infer_args),
TypeNs::BuiltinType(it) => {
Ty::from_hir_path_inner(ctx, resolved_segment, it.into(), infer_args)
self.lower_path_inner(resolved_segment, it.into(), infer_args)
}
TypeNs::TypeAliasId(it) => {
Ty::from_hir_path_inner(ctx, resolved_segment, it.into(), infer_args)
self.lower_path_inner(resolved_segment, it.into(), infer_args)
}
// FIXME: report error
TypeNs::EnumVariantId(_) => return (TyKind::Unknown.intern(&Interner), None),
};
Ty::from_type_relative_path(ctx, ty, Some(resolution), remaining_segments)
self.lower_ty_relative_path(ty, Some(resolution), remaining_segments)
}
pub(crate) fn from_hir_path(ctx: &TyLoweringContext<'_>, path: &Path) -> (Ty, Option<TypeNs>) {
pub(crate) fn lower_path(&self, path: &Path) -> (Ty, Option<TypeNs>) {
// Resolve the path (in type namespace)
if let Some(type_ref) = path.type_anchor() {
let (ty, res) = Ty::from_hir_ext(ctx, &type_ref);
return Ty::from_type_relative_path(ctx, ty, res, path.segments());
let (ty, res) = self.lower_ty_ext(&type_ref);
return self.lower_ty_relative_path(ty, res, path.segments());
}
let (resolution, remaining_index) =
match ctx.resolver.resolve_path_in_type_ns(ctx.db.upcast(), path.mod_path()) {
match self.resolver.resolve_path_in_type_ns(self.db.upcast(), path.mod_path()) {
Some(it) => it,
None => return (TyKind::Unknown.intern(&Interner), None),
};
@ -452,31 +448,23 @@ impl Ty {
),
Some(i) => (path.segments().get(i - 1).unwrap(), path.segments().skip(i)),
};
Ty::from_partly_resolved_hir_path(
ctx,
resolution,
resolved_segment,
remaining_segments,
false,
)
self.lower_partly_resolved_path(resolution, resolved_segment, remaining_segments, false)
}
fn select_associated_type(
ctx: &TyLoweringContext<'_>,
res: Option<TypeNs>,
segment: PathSegment<'_>,
) -> Ty {
fn select_associated_type(&self, res: Option<TypeNs>, segment: PathSegment<'_>) -> Ty {
if let Some(res) = res {
let ty =
associated_type_shorthand_candidates(ctx.db, res, move |name, t, associated_ty| {
let ty = associated_type_shorthand_candidates(
self.db,
res,
move |name, t, associated_ty| {
if name == segment.name {
let substs = match ctx.type_param_mode {
let substs = match self.type_param_mode {
TypeParamLoweringMode::Placeholder => {
// if we're lowering to placeholders, we have to put
// them in now
let s = Substs::type_params(
ctx.db,
ctx.resolver.generic_def().expect(
self.db,
self.resolver.generic_def().expect(
"there should be generics if there's a generic param",
),
);
@ -486,7 +474,7 @@ impl Ty {
};
// We need to shift in the bound vars, since
// associated_type_shorthand_candidates does not do that
let substs = substs.shift_bound_vars(ctx.in_binders);
let substs = substs.shift_bound_vars(self.in_binders);
// FIXME handle type parameters on the segment
return Some(
TyKind::Alias(AliasTy::Projection(ProjectionTy {
@ -498,7 +486,8 @@ impl Ty {
}
None
});
},
);
ty.unwrap_or(TyKind::Unknown.intern(&Interner))
} else {
@ -506,8 +495,8 @@ impl Ty {
}
}
fn from_hir_path_inner(
ctx: &TyLoweringContext<'_>,
fn lower_path_inner(
&self,
segment: PathSegment<'_>,
typeable: TyDefId,
infer_args: bool,
@ -517,14 +506,14 @@ impl Ty {
TyDefId::AdtId(it) => Some(it.into()),
TyDefId::TypeAliasId(it) => Some(it.into()),
};
let substs = substs_from_path_segment(ctx, segment, generic_def, infer_args);
ctx.db.ty(typeable).subst(&substs)
let substs = self.substs_from_path_segment(segment, generic_def, infer_args);
self.db.ty(typeable).subst(&substs)
}
/// Collect generic arguments from a path into a `Substs`. See also
/// `create_substs_for_ast_path` and `def_to_ty` in rustc.
pub(super) fn substs_from_path(
ctx: &TyLoweringContext<'_>,
&self,
path: &Path,
// Note that we don't call `db.value_type(resolved)` here,
// `ValueTyDefId` is just a convenient way to pass generics and
@ -554,145 +543,137 @@ impl Ty {
(segment, Some(var.parent.into()))
}
};
substs_from_path_segment(ctx, segment, generic_def, infer_args)
self.substs_from_path_segment(segment, generic_def, infer_args)
}
}
fn substs_from_path_segment(
ctx: &TyLoweringContext<'_>,
segment: PathSegment<'_>,
def_generic: Option<GenericDefId>,
infer_args: bool,
) -> Substs {
let mut substs = Vec::new();
let def_generics = def_generic.map(|def| generics(ctx.db.upcast(), def));
fn substs_from_path_segment(
&self,
segment: PathSegment<'_>,
def_generic: Option<GenericDefId>,
infer_args: bool,
) -> Substs {
let mut substs = Vec::new();
let def_generics = def_generic.map(|def| generics(self.db.upcast(), def));
let (parent_params, self_params, type_params, impl_trait_params) =
def_generics.map_or((0, 0, 0, 0), |g| g.provenance_split());
let total_len = parent_params + self_params + type_params + impl_trait_params;
let (parent_params, self_params, type_params, impl_trait_params) =
def_generics.map_or((0, 0, 0, 0), |g| g.provenance_split());
let total_len = parent_params + self_params + type_params + impl_trait_params;
substs.extend(iter::repeat(TyKind::Unknown.intern(&Interner)).take(parent_params));
substs.extend(iter::repeat(TyKind::Unknown.intern(&Interner)).take(parent_params));
let mut had_explicit_type_args = false;
let mut had_explicit_type_args = false;
if let Some(generic_args) = &segment.args_and_bindings {
if !generic_args.has_self_type {
substs.extend(iter::repeat(TyKind::Unknown.intern(&Interner)).take(self_params));
}
let expected_num =
if generic_args.has_self_type { self_params + type_params } else { type_params };
let skip = if generic_args.has_self_type && self_params == 0 { 1 } else { 0 };
// if args are provided, it should be all of them, but we can't rely on that
for arg in generic_args
.args
.iter()
.filter(|arg| matches!(arg, GenericArg::Type(_)))
.skip(skip)
.take(expected_num)
{
match arg {
GenericArg::Type(type_ref) => {
had_explicit_type_args = true;
let ty = Ty::from_hir(ctx, type_ref);
substs.push(ty);
if let Some(generic_args) = &segment.args_and_bindings {
if !generic_args.has_self_type {
substs.extend(iter::repeat(TyKind::Unknown.intern(&Interner)).take(self_params));
}
let expected_num =
if generic_args.has_self_type { self_params + type_params } else { type_params };
let skip = if generic_args.has_self_type && self_params == 0 { 1 } else { 0 };
// if args are provided, it should be all of them, but we can't rely on that
for arg in generic_args
.args
.iter()
.filter(|arg| matches!(arg, GenericArg::Type(_)))
.skip(skip)
.take(expected_num)
{
match arg {
GenericArg::Type(type_ref) => {
had_explicit_type_args = true;
let ty = self.lower_ty(type_ref);
substs.push(ty);
}
GenericArg::Lifetime(_) => {}
}
GenericArg::Lifetime(_) => {}
}
}
}
// handle defaults. In expression or pattern path segments without
// explicitly specified type arguments, missing type arguments are inferred
// (i.e. defaults aren't used).
if !infer_args || had_explicit_type_args {
if let Some(def_generic) = def_generic {
let defaults = ctx.db.generic_defaults(def_generic);
assert_eq!(total_len, defaults.len());
// handle defaults. In expression or pattern path segments without
// explicitly specified type arguments, missing type arguments are inferred
// (i.e. defaults aren't used).
if !infer_args || had_explicit_type_args {
if let Some(def_generic) = def_generic {
let defaults = self.db.generic_defaults(def_generic);
assert_eq!(total_len, defaults.len());
for default_ty in defaults.iter().skip(substs.len()) {
// each default can depend on the previous parameters
let substs_so_far = Substs(substs.clone().into());
substs.push(default_ty.clone().subst(&substs_so_far));
for default_ty in defaults.iter().skip(substs.len()) {
// each default can depend on the previous parameters
let substs_so_far = Substs(substs.clone().into());
substs.push(default_ty.clone().subst(&substs_so_far));
}
}
}
// add placeholders for args that were not provided
// FIXME: emit diagnostics in contexts where this is not allowed
for _ in substs.len()..total_len {
substs.push(TyKind::Unknown.intern(&Interner));
}
assert_eq!(substs.len(), total_len);
Substs(substs.into())
}
// add placeholders for args that were not provided
// FIXME: emit diagnostics in contexts where this is not allowed
for _ in substs.len()..total_len {
substs.push(TyKind::Unknown.intern(&Interner));
}
assert_eq!(substs.len(), total_len);
Substs(substs.into())
}
impl TraitRef {
fn from_path(
ctx: &TyLoweringContext<'_>,
fn lower_trait_ref_from_path(
&self,
path: &Path,
explicit_self_ty: Option<Ty>,
) -> Option<Self> {
) -> Option<TraitRef> {
let resolved =
match ctx.resolver.resolve_path_in_type_ns_fully(ctx.db.upcast(), path.mod_path())? {
match self.resolver.resolve_path_in_type_ns_fully(self.db.upcast(), path.mod_path())? {
TypeNs::TraitId(tr) => tr,
_ => return None,
};
let segment = path.segments().last().expect("path should have at least one segment");
Some(TraitRef::from_resolved_path(ctx, resolved, segment, explicit_self_ty))
Some(self.lower_trait_ref_from_resolved_path(resolved, segment, explicit_self_ty))
}
pub(crate) fn from_resolved_path(
ctx: &TyLoweringContext<'_>,
pub(crate) fn lower_trait_ref_from_resolved_path(
&self,
resolved: TraitId,
segment: PathSegment<'_>,
explicit_self_ty: Option<Ty>,
) -> Self {
let mut substs = TraitRef::substs_from_path(ctx, segment, resolved);
) -> TraitRef {
let mut substs = self.trait_ref_substs_from_path(segment, resolved);
if let Some(self_ty) = explicit_self_ty {
make_mut_slice(&mut substs.0)[0] = self_ty;
}
TraitRef { trait_: resolved, substs }
}
fn from_hir(
ctx: &TyLoweringContext<'_>,
fn lower_trait_ref(
&self,
type_ref: &TypeRef,
explicit_self_ty: Option<Ty>,
) -> Option<Self> {
) -> Option<TraitRef> {
let path = match type_ref {
TypeRef::Path(path) => path,
_ => return None,
};
TraitRef::from_path(ctx, path, explicit_self_ty)
self.lower_trait_ref_from_path(path, explicit_self_ty)
}
fn substs_from_path(
ctx: &TyLoweringContext<'_>,
segment: PathSegment<'_>,
resolved: TraitId,
) -> Substs {
substs_from_path_segment(ctx, segment, Some(resolved.into()), false)
fn trait_ref_substs_from_path(&self, segment: PathSegment<'_>, resolved: TraitId) -> Substs {
self.substs_from_path_segment(segment, Some(resolved.into()), false)
}
}
impl GenericPredicate {
pub(crate) fn from_where_predicate<'a>(
ctx: &'a TyLoweringContext<'a>,
pub(crate) fn lower_where_predicate(
&'a self,
where_predicate: &'a WherePredicate,
) -> impl Iterator<Item = GenericPredicate> + 'a {
match where_predicate {
WherePredicate::ForLifetime { target, bound, .. }
| WherePredicate::TypeBound { target, bound } => {
let self_ty = match target {
WherePredicateTypeTarget::TypeRef(type_ref) => Ty::from_hir(ctx, type_ref),
WherePredicateTypeTarget::TypeRef(type_ref) => self.lower_ty(type_ref),
WherePredicateTypeTarget::TypeParam(param_id) => {
let generic_def = ctx.resolver.generic_def().expect("generics in scope");
let generics = generics(ctx.db.upcast(), generic_def);
let generic_def = self.resolver.generic_def().expect("generics in scope");
let generics = generics(self.db.upcast(), generic_def);
let param_id =
hir_def::TypeParamId { parent: generic_def, local_id: *param_id };
let placeholder = to_placeholder_idx(ctx.db, param_id);
match ctx.type_param_mode {
let placeholder = to_placeholder_idx(self.db, param_id);
match self.type_param_mode {
TypeParamLoweringMode::Placeholder => TyKind::Placeholder(placeholder),
TypeParamLoweringMode::Variable => {
let idx = generics.param_idx(param_id).expect("matching generics");
@ -702,23 +683,21 @@ impl GenericPredicate {
.intern(&Interner)
}
};
GenericPredicate::from_type_bound(ctx, bound, self_ty)
.collect::<Vec<_>>()
.into_iter()
self.lower_type_bound(bound, self_ty).collect::<Vec<_>>().into_iter()
}
WherePredicate::Lifetime { .. } => vec![].into_iter(),
}
}
pub(crate) fn from_type_bound<'a>(
ctx: &'a TyLoweringContext<'a>,
pub(crate) fn lower_type_bound(
&'a self,
bound: &'a TypeBound,
self_ty: Ty,
) -> impl Iterator<Item = GenericPredicate> + 'a {
let mut bindings = None;
let trait_ref = match bound {
TypeBound::Path(path) => {
bindings = TraitRef::from_path(ctx, path, Some(self_ty));
bindings = self.lower_trait_ref_from_path(path, Some(self_ty));
Some(
bindings.clone().map_or(GenericPredicate::Error, GenericPredicate::Implemented),
)
@ -729,68 +708,62 @@ impl GenericPredicate {
trait_ref.into_iter().chain(
bindings
.into_iter()
.flat_map(move |tr| assoc_type_bindings_from_type_bound(ctx, bound, tr)),
.flat_map(move |tr| self.assoc_type_bindings_from_type_bound(bound, tr)),
)
}
}
fn assoc_type_bindings_from_type_bound<'a>(
ctx: &'a TyLoweringContext<'a>,
bound: &'a TypeBound,
trait_ref: TraitRef,
) -> impl Iterator<Item = GenericPredicate> + 'a {
let last_segment = match bound {
TypeBound::Path(path) => path.segments().last(),
TypeBound::Error | TypeBound::Lifetime(_) => None,
};
last_segment
.into_iter()
.flat_map(|segment| segment.args_and_bindings.into_iter())
.flat_map(|args_and_bindings| args_and_bindings.bindings.iter())
.flat_map(move |binding| {
let found = associated_type_by_name_including_super_traits(
ctx.db,
trait_ref.clone(),
&binding.name,
);
let (super_trait_ref, associated_ty) = match found {
None => return SmallVec::<[GenericPredicate; 1]>::new(),
Some(t) => t,
};
let projection_ty = ProjectionTy {
associated_ty: to_assoc_type_id(associated_ty),
parameters: super_trait_ref.substs,
};
let mut preds = SmallVec::with_capacity(
binding.type_ref.as_ref().map_or(0, |_| 1) + binding.bounds.len(),
);
if let Some(type_ref) = &binding.type_ref {
let ty = Ty::from_hir(ctx, type_ref);
let projection_predicate =
ProjectionPredicate { projection_ty: projection_ty.clone(), ty };
preds.push(GenericPredicate::Projection(projection_predicate));
}
for bound in &binding.bounds {
preds.extend(GenericPredicate::from_type_bound(
ctx,
bound,
TyKind::Alias(AliasTy::Projection(projection_ty.clone())).intern(&Interner),
));
}
preds
})
}
fn assoc_type_bindings_from_type_bound(
&'a self,
bound: &'a TypeBound,
trait_ref: TraitRef,
) -> impl Iterator<Item = GenericPredicate> + 'a {
let last_segment = match bound {
TypeBound::Path(path) => path.segments().last(),
TypeBound::Error | TypeBound::Lifetime(_) => None,
};
last_segment
.into_iter()
.flat_map(|segment| segment.args_and_bindings.into_iter())
.flat_map(|args_and_bindings| args_and_bindings.bindings.iter())
.flat_map(move |binding| {
let found = associated_type_by_name_including_super_traits(
self.db,
trait_ref.clone(),
&binding.name,
);
let (super_trait_ref, associated_ty) = match found {
None => return SmallVec::<[GenericPredicate; 1]>::new(),
Some(t) => t,
};
let projection_ty = ProjectionTy {
associated_ty: to_assoc_type_id(associated_ty),
parameters: super_trait_ref.substs,
};
let mut preds = SmallVec::with_capacity(
binding.type_ref.as_ref().map_or(0, |_| 1) + binding.bounds.len(),
);
if let Some(type_ref) = &binding.type_ref {
let ty = self.lower_ty(type_ref);
let projection_predicate =
ProjectionPredicate { projection_ty: projection_ty.clone(), ty };
preds.push(GenericPredicate::Projection(projection_predicate));
}
for bound in &binding.bounds {
preds.extend(self.lower_type_bound(
bound,
TyKind::Alias(AliasTy::Projection(projection_ty.clone())).intern(&Interner),
));
}
preds
})
}
impl ReturnTypeImplTrait {
fn from_hir(ctx: &TyLoweringContext, bounds: &[TypeBound]) -> Self {
fn lower_impl_trait(&self, bounds: &[TypeBound]) -> ReturnTypeImplTrait {
cov_mark::hit!(lower_rpit);
let self_ty =
TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0)).intern(&Interner);
let predicates = ctx.with_shifted_in(DebruijnIndex::ONE, |ctx| {
bounds
.iter()
.flat_map(|b| GenericPredicate::from_type_bound(ctx, b, self_ty.clone()))
.collect()
let predicates = self.with_shifted_in(DebruijnIndex::ONE, |ctx| {
bounds.iter().flat_map(|b| ctx.lower_type_bound(b, self_ty.clone())).collect()
});
ReturnTypeImplTrait { bounds: Binders::new(1, predicates) }
}
@ -886,7 +859,7 @@ pub(crate) fn field_types_query(
let ctx =
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
for (field_id, field_data) in var_data.fields().iter() {
res.insert(field_id, Binders::new(generics.len(), Ty::from_hir(&ctx, &field_data.type_ref)))
res.insert(field_id, Binders::new(generics.len(), ctx.lower_ty(&field_data.type_ref)))
}
Arc::new(res)
}
@ -914,16 +887,13 @@ pub(crate) fn generic_predicates_for_param_query(
WherePredicate::ForLifetime { target, .. }
| WherePredicate::TypeBound { target, .. } => match target {
WherePredicateTypeTarget::TypeRef(type_ref) => {
Ty::from_hir_only_param(&ctx, type_ref) == Some(param_id)
ctx.lower_ty_only_param(type_ref) == Some(param_id)
}
WherePredicateTypeTarget::TypeParam(local_id) => *local_id == param_id.local_id,
},
WherePredicate::Lifetime { .. } => false,
})
.flat_map(|pred| {
GenericPredicate::from_where_predicate(&ctx, pred)
.map(|p| Binders::new(generics.len(), p))
})
.flat_map(|pred| ctx.lower_where_predicate(pred).map(|p| Binders::new(generics.len(), p)))
.collect()
}
@ -945,7 +915,7 @@ pub(crate) fn trait_environment_query(
let mut traits_in_scope = Vec::new();
let mut clauses = Vec::new();
for pred in resolver.where_predicates_in_scope() {
for pred in GenericPredicate::from_where_predicate(&ctx, pred) {
for pred in ctx.lower_where_predicate(pred) {
if pred.is_error() {
continue;
}
@ -997,10 +967,7 @@ pub(crate) fn generic_predicates_query(
let generics = generics(db.upcast(), def);
resolver
.where_predicates_in_scope()
.flat_map(|pred| {
GenericPredicate::from_where_predicate(&ctx, pred)
.map(|p| Binders::new(generics.len(), p))
})
.flat_map(|pred| ctx.lower_where_predicate(pred).map(|p| Binders::new(generics.len(), p)))
.collect()
}
@ -1018,10 +985,8 @@ pub(crate) fn generic_defaults_query(
.iter()
.enumerate()
.map(|(idx, (_, p))| {
let mut ty = p
.default
.as_ref()
.map_or(TyKind::Unknown.intern(&Interner), |t| Ty::from_hir(&ctx, t));
let mut ty =
p.default.as_ref().map_or(TyKind::Unknown.intern(&Interner), |t| ctx.lower_ty(t));
// Each default can only refer to previous parameters.
ty.walk_mut_binders(
@ -1052,11 +1017,11 @@ fn fn_sig_for_fn(db: &dyn HirDatabase, def: FunctionId) -> PolyFnSig {
let ctx_params = TyLoweringContext::new(db, &resolver)
.with_impl_trait_mode(ImplTraitLoweringMode::Variable)
.with_type_param_mode(TypeParamLoweringMode::Variable);
let params = data.params.iter().map(|tr| Ty::from_hir(&ctx_params, tr)).collect::<Vec<_>>();
let params = data.params.iter().map(|tr| (&ctx_params).lower_ty(tr)).collect::<Vec<_>>();
let ctx_ret = TyLoweringContext::new(db, &resolver)
.with_impl_trait_mode(ImplTraitLoweringMode::Opaque)
.with_type_param_mode(TypeParamLoweringMode::Variable);
let ret = Ty::from_hir(&ctx_ret, &data.ret_type);
let ret = (&ctx_ret).lower_ty(&data.ret_type);
let generics = generics(db.upcast(), def.into());
let num_binders = generics.len();
Binders::new(num_binders, CallableSig::from_params_and_return(params, ret, data.is_varargs))
@ -1081,7 +1046,7 @@ fn type_for_const(db: &dyn HirDatabase, def: ConstId) -> Binders<Ty> {
let ctx =
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
Binders::new(generics.len(), Ty::from_hir(&ctx, &data.type_ref))
Binders::new(generics.len(), ctx.lower_ty(&data.type_ref))
}
/// Build the declared type of a static.
@ -1090,7 +1055,7 @@ fn type_for_static(db: &dyn HirDatabase, def: StaticId) -> Binders<Ty> {
let resolver = def.resolver(db.upcast());
let ctx = TyLoweringContext::new(db, &resolver);
Binders::new(0, Ty::from_hir(&ctx, &data.type_ref))
Binders::new(0, ctx.lower_ty(&data.type_ref))
}
fn fn_sig_for_struct_constructor(db: &dyn HirDatabase, def: StructId) -> PolyFnSig {
@ -1099,8 +1064,7 @@ fn fn_sig_for_struct_constructor(db: &dyn HirDatabase, def: StructId) -> PolyFnS
let resolver = def.resolver(db.upcast());
let ctx =
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
let params =
fields.iter().map(|(_, field)| Ty::from_hir(&ctx, &field.type_ref)).collect::<Vec<_>>();
let params = fields.iter().map(|(_, field)| ctx.lower_ty(&field.type_ref)).collect::<Vec<_>>();
let ret = type_for_adt(db, def.into());
Binders::new(ret.num_binders, CallableSig::from_params_and_return(params, ret.value, false))
}
@ -1126,8 +1090,7 @@ fn fn_sig_for_enum_variant_constructor(db: &dyn HirDatabase, def: EnumVariantId)
let resolver = def.parent.resolver(db.upcast());
let ctx =
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
let params =
fields.iter().map(|(_, field)| Ty::from_hir(&ctx, &field.type_ref)).collect::<Vec<_>>();
let params = fields.iter().map(|(_, field)| ctx.lower_ty(&field.type_ref)).collect::<Vec<_>>();
let ret = type_for_adt(db, def.parent.into());
Binders::new(ret.num_binders, CallableSig::from_params_and_return(params, ret.value, false))
}
@ -1163,7 +1126,7 @@ fn type_for_type_alias(db: &dyn HirDatabase, t: TypeAliasId) -> Binders<Ty> {
} else {
let substs = Substs::bound_vars(&generics, DebruijnIndex::INNERMOST);
let type_ref = &db.type_alias_data(t).type_ref;
let inner = Ty::from_hir(&ctx, type_ref.as_ref().unwrap_or(&TypeRef::Error));
let inner = ctx.lower_ty(type_ref.as_ref().unwrap_or(&TypeRef::Error));
Binders::new(substs.len(), inner)
}
}
@ -1255,7 +1218,7 @@ pub(crate) fn impl_self_ty_query(db: &dyn HirDatabase, impl_id: ImplId) -> Binde
let generics = generics(db.upcast(), impl_id.into());
let ctx =
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
Binders::new(generics.len(), Ty::from_hir(&ctx, &impl_data.target_type))
Binders::new(generics.len(), ctx.lower_ty(&impl_data.target_type))
}
pub(crate) fn const_param_ty_query(db: &dyn HirDatabase, def: ConstParamId) -> Ty {
@ -1264,7 +1227,7 @@ pub(crate) fn const_param_ty_query(db: &dyn HirDatabase, def: ConstParamId) -> T
let resolver = def.parent.resolver(db.upcast());
let ctx = TyLoweringContext::new(db, &resolver);
Ty::from_hir(&ctx, &data.ty)
ctx.lower_ty(&data.ty)
}
pub(crate) fn impl_self_ty_recover(
@ -1283,10 +1246,7 @@ pub(crate) fn impl_trait_query(db: &dyn HirDatabase, impl_id: ImplId) -> Option<
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
let self_ty = db.impl_self_ty(impl_id);
let target_trait = impl_data.target_trait.as_ref()?;
Some(Binders::new(
self_ty.num_binders,
TraitRef::from_hir(&ctx, target_trait, Some(self_ty.value))?,
))
Some(Binders::new(self_ty.num_binders, ctx.lower_trait_ref(target_trait, Some(self_ty.value))?))
}
pub(crate) fn return_type_impl_traits(
@ -1299,7 +1259,7 @@ pub(crate) fn return_type_impl_traits(
let ctx_ret = TyLoweringContext::new(db, &resolver)
.with_impl_trait_mode(ImplTraitLoweringMode::Opaque)
.with_type_param_mode(TypeParamLoweringMode::Variable);
let _ret = Ty::from_hir(&ctx_ret, &data.ret_type);
let _ret = (&ctx_ret).lower_ty(&data.ret_type);
let generics = generics(db.upcast(), def.into());
let num_binders = generics.len();
let return_type_impl_traits =

2
crates/hir_ty/src/traits/chalk.rs
View file

@ -401,7 +401,7 @@ pub(crate) fn associated_ty_data_query(
let bounds = type_alias_data
.bounds
.iter()
.flat_map(|bound| GenericPredicate::from_type_bound(&ctx, bound, self_ty.clone()))
.flat_map(|bound| ctx.lower_type_bound(bound, self_ty.clone()))
.filter_map(|pred| generic_predicate_to_inline_bound(db, &pred, &self_ty))
.map(|bound| make_binders(bound.shifted_in(&Interner), 0))
.collect();