use std::{iter, sync::Arc};
use base_db::CrateId;
-use chalk_ir::{cast::Cast, fold::Shift, interner::HasInterner, Mutability, Safety};
+use chalk_ir::{cast::Cast, fold::Shift, Mutability, Safety};
+use hir_def::generics::TypeOrConstParamData;
use hir_def::intern::Interned;
+use hir_def::path::{ModPath, PathKind};
+use hir_def::type_ref::ConstScalarOrPath;
use hir_def::{
adt::StructKind,
body::{Expander, LowerCtx},
path::{GenericArg, Path, PathSegment, PathSegments},
resolver::{HasResolver, Resolver, TypeNs},
type_ref::{TraitBoundModifier, TraitRef as HirTraitRef, TypeBound, TypeRef},
- AdtId, AssocItemId, ConstId, ConstParamId, EnumId, EnumVariantId, FunctionId, GenericDefId,
- HasModule, ImplId, ItemContainerId, LocalFieldId, Lookup, StaticId, StructId, TraitId,
- TypeAliasId, TypeParamId, UnionId, VariantId,
+ AdtId, AssocItemId, ConstId, EnumId, EnumVariantId, FunctionId, GenericDefId, HasModule,
+ ImplId, ItemContainerId, LocalFieldId, Lookup, StaticId, StructId, TraitId, TypeAliasId,
+ UnionId, VariantId,
};
+use hir_def::{ConstParamId, TypeOrConstParamId, TypeParamId};
use hir_expand::{name::Name, ExpandResult};
+use itertools::Either;
use la_arena::ArenaMap;
use rustc_hash::FxHashSet;
use smallvec::SmallVec;
-use stdx::impl_from;
+use stdx::{impl_from, never};
use syntax::{ast, SmolStr};
-use crate::all_super_traits;
+use crate::consteval::{path_to_const, unknown_const_as_generic, unknown_const_usize, usize_const};
+use crate::method_resolution::fallback_bound_vars;
+use crate::utils::Generics;
+use crate::{all_super_traits, make_binders, Const, GenericArgData, ParamKind};
use crate::{
consteval,
db::HirDatabase,
mapping::ToChalk,
static_lifetime, to_assoc_type_id, to_chalk_trait_id, to_placeholder_idx,
- utils::{
- all_super_trait_refs, associated_type_by_name_including_super_traits, generics, Generics,
- },
+ utils::{all_super_trait_refs, associated_type_by_name_including_super_traits, generics},
AliasEq, AliasTy, Binders, BoundVar, CallableSig, DebruijnIndex, DynTy, FnPointer, FnSig,
FnSubst, ImplTraitId, Interner, PolyFnSig, ProjectionTy, QuantifiedWhereClause,
QuantifiedWhereClauses, ReturnTypeImplTrait, ReturnTypeImplTraits, Substitution,
/// some type params should be represented as placeholders, and others
/// should be converted to variables. I think in practice, this isn't
/// possible currently, so this should be fine for now.
- pub type_param_mode: TypeParamLoweringMode,
+ pub type_param_mode: ParamLoweringMode,
pub impl_trait_mode: ImplTraitLoweringMode,
impl_trait_counter: Cell<u16>,
/// When turning `impl Trait` into opaque types, we have to collect the
pub fn new(db: &'a dyn HirDatabase, resolver: &'a Resolver) -> Self {
let impl_trait_counter = Cell::new(0);
let impl_trait_mode = ImplTraitLoweringMode::Disallowed;
- let type_param_mode = TypeParamLoweringMode::Placeholder;
+ let type_param_mode = ParamLoweringMode::Placeholder;
let in_binders = DebruijnIndex::INNERMOST;
let opaque_type_data = RefCell::new(Vec::new());
Self {
Self { impl_trait_mode, ..self }
}
- pub fn with_type_param_mode(self, type_param_mode: TypeParamLoweringMode) -> Self {
+ pub fn with_type_param_mode(self, type_param_mode: ParamLoweringMode) -> Self {
Self { type_param_mode, ..self }
}
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub enum TypeParamLoweringMode {
+pub enum ParamLoweringMode {
Placeholder,
Variable,
}
self.lower_ty_ext(type_ref).0
}
+ fn generics(&self) -> Generics {
+ generics(
+ self.db.upcast(),
+ self.resolver
+ .generic_def()
+ .expect("there should be generics if there's a generic param"),
+ )
+ }
+
pub fn lower_ty_ext(&self, type_ref: &TypeRef) -> (Ty, Option<TypeNs>) {
let mut res = None;
let ty = match type_ref {
}
TypeRef::Array(inner, len) => {
let inner_ty = self.lower_ty(inner);
-
- let const_len = consteval::usize_const(len.as_usize());
+ let const_len = const_or_path_to_chalk(
+ self.db,
+ self.resolver,
+ len,
+ self.type_param_mode,
+ || self.generics(),
+ DebruijnIndex::INNERMOST,
+ );
TyKind::Array(inner_ty, const_len).intern(Interner)
}
TypeRef::Placeholder => TyKind::Error.intern(Interner),
TypeRef::Fn(params, is_varargs) => {
let substs = self.with_shifted_in(DebruijnIndex::ONE, |ctx| {
- Substitution::from_iter(Interner, params.iter().map(|tr| ctx.lower_ty(tr)))
+ Substitution::from_iter(Interner, params.iter().map(|(_, tr)| ctx.lower_ty(tr)))
});
TyKind::Function(FnPointer {
num_binders: 0, // FIXME lower `for<'a> fn()` correctly
bounds.iter().flat_map(|b| ctx.lower_type_bound(b, self_ty.clone(), false)),
)
});
- let bounds = crate::make_only_type_binders(1, bounds);
+ let bounds = crate::make_single_type_binders(bounds);
TyKind::Dyn(DynTy { bounds, lifetime: static_lifetime() }).intern(Interner)
}
TypeRef::ImplTrait(bounds) => {
// place even if we encounter more opaque types while
// lowering the bounds
self.opaque_type_data.borrow_mut().push(ReturnTypeImplTrait {
- bounds: crate::make_only_type_binders(1, Vec::new()),
+ bounds: crate::make_single_type_binders(Vec::new()),
});
// We don't want to lower the bounds inside the binders
// we're currently in, because they don't end up inside
let impl_trait_id = ImplTraitId::ReturnTypeImplTrait(func, idx);
let opaque_ty_id = self.db.intern_impl_trait_id(impl_trait_id).into();
let generics = generics(self.db.upcast(), func.into());
- let parameters = generics.bound_vars_subst(self.in_binders);
+ let parameters = generics.bound_vars_subst(self.db, self.in_binders);
TyKind::OpaqueType(opaque_ty_id, parameters).intern(Interner)
}
ImplTraitLoweringMode::Param => {
if let Some(def) = self.resolver.generic_def() {
let generics = generics(self.db.upcast(), def);
let param = generics
- .iter()
+ .type_iter()
.filter(|(_, data)| {
data.provenance == TypeParamProvenance::ArgumentImplTrait
})
let idx = self.impl_trait_counter.get();
// FIXME we're probably doing something wrong here
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) = self.resolver.generic_def() {
- let generics = generics(self.db.upcast(), def);
- generics.provenance_split()
- } else {
- (0, 0, 0, 0)
- };
+ let (
+ parent_params,
+ self_params,
+ list_params,
+ const_params,
+ _impl_trait_params,
+ ) = if let Some(def) = self.resolver.generic_def() {
+ let generics = generics(self.db.upcast(), def);
+ generics.provenance_split()
+ } else {
+ (0, 0, 0, 0, 0)
+ };
TyKind::BoundVar(BoundVar::new(
self.in_binders,
- idx as usize + parent_params + self_params + list_params,
+ idx as usize + parent_params + self_params + list_params + const_params,
))
.intern(Interner)
}
/// 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 lower_ty_only_param(&self, type_ref: &TypeRef) -> Option<TypeParamId> {
+ fn lower_ty_only_param(&self, type_ref: &TypeRef) -> Option<TypeOrConstParamId> {
let path = match type_ref {
TypeRef::Path(path) => path,
_ => return None,
_ => return None,
};
match resolution {
- TypeNs::GenericParam(param_id) => Some(param_id),
+ TypeNs::GenericParam(param_id) => Some(param_id.into()),
_ => None,
}
}
)
});
let dyn_ty = DynTy {
- bounds: crate::make_only_type_binders(
- 1,
+ bounds: crate::make_single_type_binders(
QuantifiedWhereClauses::from_iter(
Interner,
Some(crate::wrap_empty_binders(WhereClause::Implemented(
self.resolver.generic_def().expect("generics in scope"),
);
match self.type_param_mode {
- TypeParamLoweringMode::Placeholder => {
- TyKind::Placeholder(to_placeholder_idx(self.db, param_id))
+ ParamLoweringMode::Placeholder => {
+ TyKind::Placeholder(to_placeholder_idx(self.db, param_id.into()))
}
- TypeParamLoweringMode::Variable => {
- let idx = generics.param_idx(param_id).expect("matching generics");
+ ParamLoweringMode::Variable => {
+ let idx = generics.param_idx(param_id.into()).expect("matching generics");
TyKind::BoundVar(BoundVar::new(self.in_binders, idx))
}
}
TypeNs::SelfType(impl_id) => {
let generics = generics(self.db.upcast(), impl_id.into());
let substs = match self.type_param_mode {
- TypeParamLoweringMode::Placeholder => generics.type_params_subst(self.db),
- TypeParamLoweringMode::Variable => generics.bound_vars_subst(self.in_binders),
+ ParamLoweringMode::Placeholder => generics.placeholder_subst(self.db),
+ ParamLoweringMode::Variable => {
+ generics.bound_vars_subst(self.db, self.in_binders)
+ }
};
self.db.impl_self_ty(impl_id).substitute(Interner, &substs)
}
TypeNs::AdtSelfType(adt) => {
let generics = generics(self.db.upcast(), adt.into());
let substs = match self.type_param_mode {
- TypeParamLoweringMode::Placeholder => generics.type_params_subst(self.db),
- TypeParamLoweringMode::Variable => generics.bound_vars_subst(self.in_binders),
+ ParamLoweringMode::Placeholder => generics.placeholder_subst(self.db),
+ ParamLoweringMode::Variable => {
+ generics.bound_vars_subst(self.db, self.in_binders)
+ }
};
self.db.ty(adt.into()).substitute(Interner, &substs)
}
}
fn select_associated_type(&self, res: Option<TypeNs>, segment: PathSegment<'_>) -> Ty {
- if let Some(res) = res {
- let ty = named_associated_type_shorthand_candidates(
- self.db,
- res,
- Some(segment.name.clone()),
- move |name, t, associated_ty| {
- if name == segment.name {
- let substs = match self.type_param_mode {
- TypeParamLoweringMode::Placeholder => {
- // if we're lowering to placeholders, we have to put
- // them in now
- let generics = generics(
- self.db.upcast(),
- self.resolver.generic_def().expect(
- "there should be generics if there's a generic param",
- ),
- );
- let s = generics.type_params_subst(self.db);
- s.apply(t.substitution.clone(), Interner)
- }
- TypeParamLoweringMode::Variable => t.substitution.clone(),
- };
- // We need to shift in the bound vars, since
- // associated_type_shorthand_candidates does not do that
- let substs = substs.shifted_in_from(Interner, self.in_binders);
- // FIXME handle type parameters on the segment
- Some(
- TyKind::Alias(AliasTy::Projection(ProjectionTy {
- associated_ty_id: to_assoc_type_id(associated_ty),
- substitution: substs,
- }))
- .intern(Interner),
- )
- } else {
- None
- }
- },
- );
+ let (def, res) = match (self.resolver.generic_def(), res) {
+ (Some(def), Some(res)) => (def, res),
+ _ => return TyKind::Error.intern(Interner),
+ };
+ let ty = named_associated_type_shorthand_candidates(
+ self.db,
+ def,
+ res,
+ Some(segment.name.clone()),
+ move |name, t, associated_ty| {
+ if name == segment.name {
+ let substs = match self.type_param_mode {
+ ParamLoweringMode::Placeholder => {
+ // if we're lowering to placeholders, we have to put
+ // them in now
+ let generics = generics(
+ self.db.upcast(),
+ self.resolver
+ .generic_def()
+ .expect("there should be generics if there's a generic param"),
+ );
+ let s = generics.placeholder_subst(self.db);
+ s.apply(t.substitution.clone(), Interner)
+ }
+ ParamLoweringMode::Variable => t.substitution.clone(),
+ };
+ // We need to shift in the bound vars, since
+ // associated_type_shorthand_candidates does not do that
+ let substs = substs.shifted_in_from(Interner, self.in_binders);
+ // FIXME handle type parameters on the segment
+ Some(
+ TyKind::Alias(AliasTy::Projection(ProjectionTy {
+ associated_ty_id: to_assoc_type_id(associated_ty),
+ substitution: substs,
+ }))
+ .intern(Interner),
+ )
+ } else {
+ None
+ }
+ },
+ );
- ty.unwrap_or_else(|| TyKind::Error.intern(Interner))
- } else {
- TyKind::Error.intern(Interner)
- }
+ ty.unwrap_or_else(|| TyKind::Error.intern(Interner))
}
fn lower_path_inner(
explicit_self_ty: Option<Ty>,
) -> Substitution {
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;
-
- substs.extend(iter::repeat(TyKind::Error.intern(Interner)).take(parent_params));
+ let def_generics = if let Some(def) = def_generic {
+ generics(self.db.upcast(), def)
+ } else {
+ return Substitution::empty(Interner);
+ };
+ let (parent_params, self_params, type_params, const_params, impl_trait_params) =
+ def_generics.provenance_split();
+ let total_len =
+ parent_params + self_params + type_params + const_params + impl_trait_params;
+
+ let ty_error = GenericArgData::Ty(TyKind::Error.intern(Interner)).intern(Interner);
+ let const_error = GenericArgData::Const(consteval::usize_const(None)).intern(Interner);
+
+ for (_, data) in def_generics.iter().take(parent_params) {
+ match data {
+ TypeOrConstParamData::TypeParamData(_) => substs.push(ty_error.clone()),
+ TypeOrConstParamData::ConstParamData(_) => substs.push(const_error.clone()),
+ }
+ }
let fill_self_params = || {
substs.extend(
explicit_self_ty
.into_iter()
- .chain(iter::repeat(TyKind::Error.intern(Interner)))
+ .map(|x| GenericArgData::Ty(x).intern(Interner))
+ .chain(iter::repeat(ty_error.clone()))
.take(self_params),
)
};
- let mut had_explicit_type_args = false;
+ let mut had_explicit_args = false;
if let Some(generic_args) = &segment.args_and_bindings {
if !generic_args.has_self_type {
fill_self_params();
}
- let expected_num =
- if generic_args.has_self_type { self_params + type_params } else { type_params };
+ let expected_num = if generic_args.has_self_type {
+ self_params + type_params + const_params
+ } else {
+ type_params + const_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
+ for (arg, id) in generic_args
.args
.iter()
- .filter(|arg| matches!(arg, GenericArg::Type(_)))
+ .filter(|arg| !matches!(arg, GenericArg::Lifetime(_)))
.skip(skip)
.take(expected_num)
+ .zip(def_generics.iter_id().skip(skip))
{
- match arg {
- GenericArg::Type(type_ref) => {
- had_explicit_type_args = true;
- let ty = self.lower_ty(type_ref);
- substs.push(ty);
- }
- GenericArg::Lifetime(_) => {}
+ if let Some(x) = generic_arg_to_chalk(
+ self.db,
+ id,
+ arg,
+ &mut (),
+ |_, type_ref| self.lower_ty(type_ref),
+ |_, c| {
+ const_or_path_to_chalk(
+ self.db,
+ &self.resolver,
+ c,
+ self.type_param_mode,
+ || self.generics(),
+ DebruijnIndex::INNERMOST,
+ )
+ },
+ ) {
+ had_explicit_args = true;
+ substs.push(x);
}
}
} else {
// 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 !infer_args || had_explicit_args {
if let Some(def_generic) = def_generic {
let defaults = self.db.generic_defaults(def_generic);
assert_eq!(total_len, defaults.len());
// 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::Error.intern(Interner));
+ for (_, data) in def_generics.iter().skip(substs.len()) {
+ match data {
+ TypeOrConstParamData::TypeParamData(_) => substs.push(ty_error.clone()),
+ TypeOrConstParamData::ConstParamData(_) => substs.push(const_error.clone()),
+ }
}
assert_eq!(substs.len(), total_len);
| WherePredicate::TypeBound { target, bound } => {
let self_ty = match target {
WherePredicateTypeTarget::TypeRef(type_ref) => self.lower_ty(type_ref),
- WherePredicateTypeTarget::TypeParam(param_id) => {
+ WherePredicateTypeTarget::TypeOrConstParam(param_id) => {
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 param_id = hir_def::TypeOrConstParamId {
+ parent: generic_def,
+ local_id: *param_id,
+ };
let placeholder = to_placeholder_idx(self.db, param_id);
match self.type_param_mode {
- TypeParamLoweringMode::Placeholder => TyKind::Placeholder(placeholder),
- TypeParamLoweringMode::Variable => {
+ ParamLoweringMode::Placeholder => TyKind::Placeholder(placeholder),
+ ParamLoweringMode::Variable => {
let idx = generics.param_idx(param_id).expect("matching generics");
TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, idx))
}
}
predicates
});
-
- ReturnTypeImplTrait { bounds: crate::make_only_type_binders(1, predicates) }
+ ReturnTypeImplTrait { bounds: crate::make_single_type_binders(predicates) }
}
}
pub fn associated_type_shorthand_candidates<R>(
db: &dyn HirDatabase,
+ def: GenericDefId,
res: TypeNs,
cb: impl FnMut(&Name, &TraitRef, TypeAliasId) -> Option<R>,
) -> Option<R> {
- named_associated_type_shorthand_candidates(db, res, None, cb)
+ named_associated_type_shorthand_candidates(db, def, res, None, cb)
}
fn named_associated_type_shorthand_candidates<R>(
db: &dyn HirDatabase,
+ // If the type parameter is defined in an impl and we're in a method, there
+ // might be additional where clauses to consider
+ def: GenericDefId,
res: TypeNs,
assoc_name: Option<Name>,
mut cb: impl FnMut(&Name, &TraitRef, TypeAliasId) -> Option<R>,
db.impl_trait(impl_id)?.into_value_and_skipped_binders().0,
),
TypeNs::GenericParam(param_id) => {
- let predicates = db.generic_predicates_for_param(param_id, assoc_name);
+ let predicates = db.generic_predicates_for_param(def, param_id.into(), assoc_name);
let res = predicates.iter().find_map(|pred| match pred.skip_binders().skip_binders() {
// FIXME: how to correctly handle higher-ranked bounds here?
WhereClause::Implemented(tr) => search(
return res;
}
// Handle `Self::Type` referring to own associated type in trait definitions
- if let GenericDefId::TraitId(trait_id) = param_id.parent {
+ if let GenericDefId::TraitId(trait_id) = param_id.parent() {
let generics = generics(db.upcast(), trait_id.into());
- if generics.params.types[param_id.local_id].provenance
- == TypeParamProvenance::TraitSelf
- {
+ if generics.params.type_or_consts[param_id.local_id()].is_trait_self() {
let trait_ref = TyBuilder::trait_ref(db, trait_id)
.fill_with_bound_vars(DebruijnIndex::INNERMOST, 0)
.build();
let generics = generics(db.upcast(), def);
let mut res = ArenaMap::default();
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
for (field_id, field_data) in var_data.fields().iter() {
- res.insert(field_id, make_binders(&generics, ctx.lower_ty(&field_data.type_ref)))
+ res.insert(field_id, make_binders(db, &generics, ctx.lower_ty(&field_data.type_ref)))
}
Arc::new(res)
}
/// these are fine: `T: Foo<U::Item>, U: Foo<()>`.
pub(crate) fn generic_predicates_for_param_query(
db: &dyn HirDatabase,
- param_id: TypeParamId,
+ def: GenericDefId,
+ param_id: TypeOrConstParamId,
assoc_name: Option<Name>,
) -> Arc<[Binders<QuantifiedWhereClause>]> {
- let resolver = param_id.parent.resolver(db.upcast());
+ let resolver = def.resolver(db.upcast());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
- let generics = generics(db.upcast(), param_id.parent);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
+ let generics = generics(db.upcast(), def);
let mut predicates: Vec<_> = resolver
.where_predicates_in_scope()
// we have to filter out all other predicates *first*, before attempting to lower them
return false;
}
}
- WherePredicateTypeTarget::TypeParam(local_id) => {
+ WherePredicateTypeTarget::TypeOrConstParam(local_id) => {
if *local_id != param_id.local_id {
return false;
}
}
WherePredicate::Lifetime { .. } => false,
})
- .flat_map(|pred| ctx.lower_where_predicate(pred, true).map(|p| make_binders(&generics, p)))
+ .flat_map(|pred| {
+ ctx.lower_where_predicate(pred, true).map(|p| make_binders(db, &generics, p))
+ })
.collect();
- let subst = generics.bound_vars_subst(DebruijnIndex::INNERMOST);
+ let subst = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
let explicitly_unsized_tys = ctx.unsized_types.into_inner();
let implicitly_sized_predicates =
implicitly_sized_clauses(db, param_id.parent, &explicitly_unsized_tys, &subst, &resolver)
- .map(|p| make_binders(&generics, crate::wrap_empty_binders(p)));
+ .map(|p| make_binders(db, &generics, crate::wrap_empty_binders(p)));
predicates.extend(implicitly_sized_predicates);
predicates.into()
}
pub(crate) fn generic_predicates_for_param_recover(
_db: &dyn HirDatabase,
_cycle: &[String],
- _param_id: &TypeParamId,
+ _def: &GenericDefId,
+ _param_id: &TypeOrConstParamId,
_assoc_name: &Option<Name>,
) -> Arc<[Binders<QuantifiedWhereClause>]> {
Arc::new([])
def: GenericDefId,
) -> Arc<TraitEnvironment> {
let resolver = def.resolver(db.upcast());
- let ctx = TyLoweringContext::new(db, &resolver)
- .with_type_param_mode(TypeParamLoweringMode::Placeholder);
+ let ctx =
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Placeholder);
let mut traits_in_scope = Vec::new();
let mut clauses = Vec::new();
for pred in resolver.where_predicates_in_scope() {
// function default implementations (and speculative code
// inside consts or type aliases)
cov_mark::hit!(trait_self_implements_self);
- let substs = TyBuilder::type_params_subst(db, trait_id);
+ let substs = TyBuilder::placeholder_subst(db, trait_id);
let trait_ref = TraitRef { trait_id: to_chalk_trait_id(trait_id), substitution: substs };
let pred = WhereClause::Implemented(trait_ref);
let program_clause: chalk_ir::ProgramClause<Interner> = pred.cast(Interner);
clauses.push(program_clause.into_from_env_clause(Interner));
}
- let subst = generics(db.upcast(), def).type_params_subst(db);
+ let subst = generics(db.upcast(), def).placeholder_subst(db);
let explicitly_unsized_tys = ctx.unsized_types.into_inner();
let implicitly_sized_clauses =
implicitly_sized_clauses(db, def, &explicitly_unsized_tys, &subst, &resolver).map(|pred| {
) -> Arc<[Binders<QuantifiedWhereClause>]> {
let resolver = def.resolver(db.upcast());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
let generics = generics(db.upcast(), def);
let mut predicates = resolver
.where_predicates_in_scope()
- .flat_map(|pred| ctx.lower_where_predicate(pred, false).map(|p| make_binders(&generics, p)))
+ .flat_map(|pred| {
+ ctx.lower_where_predicate(pred, false).map(|p| make_binders(db, &generics, p))
+ })
.collect::<Vec<_>>();
- let subst = generics.bound_vars_subst(DebruijnIndex::INNERMOST);
+ let subst = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
let explicitly_unsized_tys = ctx.unsized_types.into_inner();
let implicitly_sized_predicates =
implicitly_sized_clauses(db, def, &explicitly_unsized_tys, &subst, &resolver)
- .map(|p| make_binders(&generics, crate::wrap_empty_binders(p)));
+ .map(|p| make_binders(db, &generics, crate::wrap_empty_binders(p)));
predicates.extend(implicitly_sized_predicates);
predicates.into()
}
pub(crate) fn generic_defaults_query(
db: &dyn HirDatabase,
def: GenericDefId,
-) -> Arc<[Binders<Ty>]> {
+) -> Arc<[Binders<chalk_ir::GenericArg<Interner>>]> {
let resolver = def.resolver(db.upcast());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
let generic_params = generics(db.upcast(), def);
let defaults = generic_params
.iter()
.enumerate()
- .map(|(idx, (_, p))| {
+ .map(|(idx, (id, p))| {
+ let p = match p {
+ TypeOrConstParamData::TypeParamData(p) => p,
+ TypeOrConstParamData::ConstParamData(_) => {
+ // FIXME: implement const generic defaults
+ let val = unknown_const_as_generic(
+ db.const_param_ty(ConstParamId::from_unchecked(id)),
+ );
+ return crate::make_binders_with_count(db, idx, &generic_params, val);
+ }
+ };
let mut ty =
p.default.as_ref().map_or(TyKind::Error.intern(Interner), |t| ctx.lower_ty(t));
// Each default can only refer to previous parameters.
- ty = crate::fold_free_vars(ty, |bound, binders| {
- if bound.index >= idx && bound.debruijn == DebruijnIndex::INNERMOST {
- // type variable default referring to parameter coming
- // after it. This is forbidden (FIXME: report
- // diagnostic)
- TyKind::Error.intern(Interner)
- } else {
- bound.shifted_in_from(binders).to_ty(Interner)
- }
- });
-
- crate::make_only_type_binders(idx, ty)
+ // type variable default referring to parameter coming
+ // after it. This is forbidden (FIXME: report
+ // diagnostic)
+ ty = fallback_bound_vars(ty, idx);
+ let val = GenericArgData::Ty(ty).intern(Interner);
+ crate::make_binders_with_count(db, idx, &generic_params, val)
})
.collect();
db: &dyn HirDatabase,
_cycle: &[String],
def: &GenericDefId,
-) -> Arc<[Binders<Ty>]> {
+) -> Arc<[Binders<crate::GenericArg>]> {
let generic_params = generics(db.upcast(), *def);
-
+ // FIXME: this code is not covered in tests.
// we still need one default per parameter
let defaults = generic_params
- .iter()
+ .iter_id()
.enumerate()
- .map(|(idx, _)| {
- let ty = TyKind::Error.intern(Interner);
-
- crate::make_only_type_binders(idx, ty)
+ .map(|(count, id)| {
+ let val = match id {
+ itertools::Either::Left(_) => {
+ GenericArgData::Ty(TyKind::Error.intern(Interner)).intern(Interner)
+ }
+ itertools::Either::Right(id) => unknown_const_as_generic(db.const_param_ty(id)),
+ };
+ crate::make_binders_with_count(db, count, &generic_params, val)
})
.collect();
let resolver = def.resolver(db.upcast());
let ctx_params = TyLoweringContext::new(db, &resolver)
.with_impl_trait_mode(ImplTraitLoweringMode::Variable)
- .with_type_param_mode(TypeParamLoweringMode::Variable);
+ .with_type_param_mode(ParamLoweringMode::Variable);
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);
+ .with_type_param_mode(ParamLoweringMode::Variable);
let ret = ctx_ret.lower_ty(&data.ret_type);
let generics = generics(db.upcast(), def.into());
let mut sig = CallableSig::from_params_and_return(params, ret, data.is_varargs());
if !data.legacy_const_generics_indices.is_empty() {
sig.set_legacy_const_generics_indices(&data.legacy_const_generics_indices);
}
- make_binders(&generics, sig)
+ make_binders(db, &generics, sig)
}
/// Build the declared type of a function. This should not need to look at the
/// function body.
fn type_for_fn(db: &dyn HirDatabase, def: FunctionId) -> Binders<Ty> {
let generics = generics(db.upcast(), def.into());
- let substs = generics.bound_vars_subst(DebruijnIndex::INNERMOST);
+ let substs = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
make_binders(
+ db,
&generics,
TyKind::FnDef(CallableDefId::FunctionId(def).to_chalk(db), substs).intern(Interner),
)
let generics = generics(db.upcast(), def.into());
let resolver = def.resolver(db.upcast());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
- make_binders(&generics, ctx.lower_ty(&data.type_ref))
+ make_binders(db, &generics, ctx.lower_ty(&data.type_ref))
}
/// Build the declared type of a static.
let fields = struct_data.variant_data.fields();
let resolver = def.resolver(db.upcast());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
let params = fields.iter().map(|(_, field)| ctx.lower_ty(&field.type_ref)).collect::<Vec<_>>();
let (ret, binders) = type_for_adt(db, def.into()).into_value_and_skipped_binders();
Binders::new(binders, CallableSig::from_params_and_return(params, ret, false))
return type_for_adt(db, def.into());
}
let generics = generics(db.upcast(), def.into());
- let substs = generics.bound_vars_subst(DebruijnIndex::INNERMOST);
+ let substs = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
make_binders(
+ db,
&generics,
TyKind::FnDef(CallableDefId::StructId(def).to_chalk(db), substs).intern(Interner),
)
let fields = var_data.variant_data.fields();
let resolver = def.parent.resolver(db.upcast());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
let params = fields.iter().map(|(_, field)| ctx.lower_ty(&field.type_ref)).collect::<Vec<_>>();
let (ret, binders) = type_for_adt(db, def.parent.into()).into_value_and_skipped_binders();
Binders::new(binders, CallableSig::from_params_and_return(params, ret, false))
return type_for_adt(db, def.parent.into());
}
let generics = generics(db.upcast(), def.parent.into());
- let substs = generics.bound_vars_subst(DebruijnIndex::INNERMOST);
+ let substs = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
make_binders(
+ db,
&generics,
TyKind::FnDef(CallableDefId::EnumVariantId(def).to_chalk(db), substs).intern(Interner),
)
fn type_for_adt(db: &dyn HirDatabase, adt: AdtId) -> Binders<Ty> {
let generics = generics(db.upcast(), adt.into());
- let b = TyBuilder::adt(db, adt);
- let ty = b.fill_with_bound_vars(DebruijnIndex::INNERMOST, 0).build();
- make_binders(&generics, ty)
+ let subst = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
+ let ty = TyKind::Adt(crate::AdtId(adt), subst).intern(Interner);
+ make_binders(db, &generics, ty)
}
fn type_for_type_alias(db: &dyn HirDatabase, t: TypeAliasId) -> Binders<Ty> {
let generics = generics(db.upcast(), t.into());
let resolver = t.resolver(db.upcast());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
if db.type_alias_data(t).is_extern {
Binders::empty(Interner, TyKind::Foreign(crate::to_foreign_def_id(t)).intern(Interner))
} else {
let type_ref = &db.type_alias_data(t).type_ref;
let inner = ctx.lower_ty(type_ref.as_deref().unwrap_or(&TypeRef::Error));
- make_binders(&generics, inner)
+ make_binders(db, &generics, inner)
}
}
TyDefId::AdtId(it) => generics(db.upcast(), it.into()),
TyDefId::TypeAliasId(it) => generics(db.upcast(), it.into()),
};
- make_binders(&generics, TyKind::Error.intern(Interner))
+ make_binders(db, &generics, TyKind::Error.intern(Interner))
}
pub(crate) fn value_ty_query(db: &dyn HirDatabase, def: ValueTyDefId) -> Binders<Ty> {
));
let generics = generics(db.upcast(), impl_id.into());
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
- make_binders(&generics, ctx.lower_ty(&impl_data.self_ty))
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
+ make_binders(db, &generics, ctx.lower_ty(&impl_data.self_ty))
}
+// returns None if def is a type arg
pub(crate) fn const_param_ty_query(db: &dyn HirDatabase, def: ConstParamId) -> Ty {
- let parent_data = db.generic_params(def.parent);
- let data = &parent_data.consts[def.local_id];
- let resolver = def.parent.resolver(db.upcast());
+ let parent_data = db.generic_params(def.parent());
+ let data = &parent_data.type_or_consts[def.local_id()];
+ let resolver = def.parent().resolver(db.upcast());
let ctx = TyLoweringContext::new(db, &resolver);
-
- ctx.lower_ty(&data.ty)
+ match data {
+ TypeOrConstParamData::TypeParamData(_) => {
+ never!();
+ Ty::new(Interner, TyKind::Error)
+ }
+ TypeOrConstParamData::ConstParamData(d) => ctx.lower_ty(&d.ty),
+ }
}
pub(crate) fn impl_self_ty_recover(
impl_id: &ImplId,
) -> Binders<Ty> {
let generics = generics(db.upcast(), (*impl_id).into());
- make_binders(&generics, TyKind::Error.intern(Interner))
+ make_binders(db, &generics, TyKind::Error.intern(Interner))
}
pub(crate) fn impl_trait_query(db: &dyn HirDatabase, impl_id: ImplId) -> Option<Binders<TraitRef>> {
impl_id, impl_loc, impl_data
));
let ctx =
- TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
+ TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
let (self_ty, binders) = db.impl_self_ty(impl_id).into_value_and_skipped_binders();
let target_trait = impl_data.target_trait.as_ref()?;
Some(Binders::new(binders, ctx.lower_trait_ref(target_trait, Some(self_ty))?))
let resolver = def.resolver(db.upcast());
let ctx_ret = TyLoweringContext::new(db, &resolver)
.with_impl_trait_mode(ImplTraitLoweringMode::Opaque)
- .with_type_param_mode(TypeParamLoweringMode::Variable);
+ .with_type_param_mode(ParamLoweringMode::Variable);
let _ret = (&ctx_ret).lower_ty(&data.ret_type);
let generics = generics(db.upcast(), def.into());
let return_type_impl_traits =
if return_type_impl_traits.impl_traits.is_empty() {
None
} else {
- Some(Arc::new(make_binders(&generics, return_type_impl_traits)))
+ Some(Arc::new(make_binders(db, &generics, return_type_impl_traits)))
}
}
}
}
-fn make_binders<T: HasInterner<Interner = Interner>>(generics: &Generics, value: T) -> Binders<T> {
- crate::make_only_type_binders(generics.len(), value)
+pub(crate) fn generic_arg_to_chalk<'a, T>(
+ db: &dyn HirDatabase,
+ kind_id: Either<TypeParamId, ConstParamId>,
+ arg: &'a GenericArg,
+ this: &mut T,
+ for_type: impl FnOnce(&mut T, &TypeRef) -> Ty + 'a,
+ for_const: impl FnOnce(&mut T, &ConstScalarOrPath) -> Const + 'a,
+) -> Option<crate::GenericArg> {
+ let kind = match kind_id {
+ Either::Left(_) => ParamKind::Type,
+ Either::Right(id) => {
+ let ty = db.const_param_ty(id);
+ ParamKind::Const(ty)
+ }
+ };
+ Some(match (arg, kind) {
+ (GenericArg::Type(type_ref), ParamKind::Type) => {
+ let ty = for_type(this, type_ref);
+ GenericArgData::Ty(ty).intern(Interner)
+ }
+ (GenericArg::Const(c), ParamKind::Const(_)) => {
+ GenericArgData::Const(for_const(this, c)).intern(Interner)
+ }
+ (GenericArg::Const(_), ParamKind::Type) => {
+ GenericArgData::Ty(TyKind::Error.intern(Interner)).intern(Interner)
+ }
+ (GenericArg::Type(t), ParamKind::Const(ty)) => {
+ // We want to recover simple idents, which parser detects them
+ // as types. Maybe here is not the best place to do it, but
+ // it works.
+ if let TypeRef::Path(p) = t {
+ let p = p.mod_path();
+ if p.kind == PathKind::Plain {
+ if let [n] = p.segments() {
+ let c = ConstScalarOrPath::Path(n.clone());
+ return Some(GenericArgData::Const(for_const(this, &c)).intern(Interner));
+ }
+ }
+ }
+ unknown_const_as_generic(ty)
+ }
+ (GenericArg::Lifetime(_), _) => return None,
+ })
+}
+
+pub(crate) fn const_or_path_to_chalk(
+ db: &dyn HirDatabase,
+ resolver: &Resolver,
+ value: &ConstScalarOrPath,
+ mode: ParamLoweringMode,
+ args: impl FnOnce() -> Generics,
+ debruijn: DebruijnIndex,
+) -> Const {
+ match value {
+ ConstScalarOrPath::Scalar(s) => usize_const(s.as_usize()),
+ ConstScalarOrPath::Path(n) => {
+ let path = ModPath::from_segments(PathKind::Plain, Some(n.clone()));
+ path_to_const(db, resolver, &path, mode, args, debruijn)
+ .unwrap_or_else(|| unknown_const_usize())
+ }
+ }
}
projects / rust.git / blobdiff