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Remove idx and parent generics from generics

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This makes `hir_def::GenericParams` flatter. The logic for
re-numbering the params is moved to hir instead.
This commit is contained in:
Aleksey Kladov 2019-12-07 11:50:36 +01:00
parent 30fefcc08c
commit 8e9837df21
10 changed files with 181 additions and 157 deletions
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35
crates/ra_hir_ty/src/lower.rs
View file

@ -24,7 +24,7 @@ use crate::{
db::HirDatabase,
primitive::{FloatTy, IntTy},
utils::{
all_super_traits, associated_type_by_name_including_super_traits, make_mut_slice,
all_super_traits, associated_type_by_name_including_super_traits, generics, make_mut_slice,
variant_data,
},
FnSig, GenericPredicate, ProjectionPredicate, ProjectionTy, Substs, TraitEnvironment, TraitRef,
@ -111,7 +111,9 @@ impl Ty {
Some((it, None)) => it,
_ => return None,
};
if let TypeNs::GenericParam(idx) = resolution {
if let TypeNs::GenericParam(param_id) = resolution {
let generics = generics(db, resolver.generic_def().expect("generics in scope"));
let idx = generics.param_idx(param_id);
Some(idx)
} else {
None
@ -174,9 +176,11 @@ impl Ty {
Ty::Dyn(Arc::new([GenericPredicate::Implemented(trait_ref)]))
};
}
TypeNs::GenericParam(idx) => {
TypeNs::GenericParam(param_id) => {
let generics = generics(db, resolver.generic_def().expect("generics in scope"));
let idx = generics.param_idx(param_id);
// FIXME: maybe return name in resolution?
let name = resolved_segment.name.clone();
let name = generics.param_name(param_id);
Ty::Param { idx, name }
}
TypeNs::SelfType(impl_id) => db.impl_self_ty(impl_id).clone(),
@ -315,10 +319,10 @@ pub(super) fn substs_from_path_segment(
add_self_param: bool,
) -> Substs {
let mut substs = Vec::new();
let def_generics = def_generic.map(|def| db.generic_params(def.into()));
let def_generics = def_generic.map(|def| generics(db, def.into()));
let (parent_param_count, param_count) =
def_generics.map_or((0, 0), |g| (g.count_parent_params(), g.params.len()));
def_generics.map_or((0, 0), |g| (g.count_parent_params(), g.params.params.len()));
substs.extend(iter::repeat(Ty::Unknown).take(parent_param_count));
if add_self_param {
// FIXME this add_self_param argument is kind of a hack: Traits have the
@ -567,12 +571,11 @@ pub(crate) fn generic_predicates_query(
/// Resolve the default type params from generics
pub(crate) fn generic_defaults_query(db: &impl HirDatabase, def: GenericDefId) -> Substs {
let resolver = def.resolver(db);
let generic_params = db.generic_params(def.into());
let generic_params = generics(db, def.into());
let defaults = generic_params
.params_including_parent()
.into_iter()
.map(|p| p.default.as_ref().map_or(Ty::Unknown, |t| Ty::from_hir(db, &resolver, t)))
.iter()
.map(|(_idx, p)| p.default.as_ref().map_or(Ty::Unknown, |t| Ty::from_hir(db, &resolver, t)))
.collect();
Substs(defaults)
@ -589,7 +592,7 @@ fn fn_sig_for_fn(db: &impl HirDatabase, def: FunctionId) -> FnSig {
/// Build the declared type of a function. This should not need to look at the
/// function body.
fn type_for_fn(db: &impl HirDatabase, def: FunctionId) -> Ty {
let generics = db.generic_params(def.into());
let generics = generics(db, def.into());
let substs = Substs::identity(&generics);
Ty::apply(TypeCtor::FnDef(def.into()), substs)
}
@ -639,7 +642,7 @@ fn type_for_struct_constructor(db: &impl HirDatabase, def: StructId) -> Ty {
if struct_data.variant_data.is_unit() {
return type_for_adt(db, def.into()); // Unit struct
}
let generics = db.generic_params(def.into());
let generics = generics(db, def.into());
let substs = Substs::identity(&generics);
Ty::apply(TypeCtor::FnDef(def.into()), substs)
}
@ -653,7 +656,7 @@ fn fn_sig_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariantId
.iter()
.map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
.collect::<Vec<_>>();
let generics = db.generic_params(def.parent.into());
let generics = generics(db, def.parent.into());
let substs = Substs::identity(&generics);
let ret = type_for_adt(db, def.parent.into()).subst(&substs);
FnSig::from_params_and_return(params, ret)
@ -666,18 +669,18 @@ fn type_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariantId)
if var_data.is_unit() {
return type_for_adt(db, def.parent.into()); // Unit variant
}
let generics = db.generic_params(def.parent.into());
let generics = generics(db, def.parent.into());
let substs = Substs::identity(&generics);
Ty::apply(TypeCtor::FnDef(EnumVariantId::from(def).into()), substs)
}
fn type_for_adt(db: &impl HirDatabase, adt: AdtId) -> Ty {
let generics = db.generic_params(adt.into());
let generics = generics(db, adt.into());
Ty::apply(TypeCtor::Adt(adt), Substs::identity(&generics))
}
fn type_for_type_alias(db: &impl HirDatabase, t: TypeAliasId) -> Ty {
let generics = db.generic_params(t.into());
let generics = generics(db, t.into());
let resolver = t.resolver(db);
let type_ref = &db.type_alias_data(t).type_ref;
let substs = Substs::identity(&generics);