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the "add missing members" assists: implemented substitution of default values of const params

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ponyii 2023-06-30 17:31:04 +04:00
parent 6918eb6ebd
commit 52b4392724
8 changed files with 127 additions and 52 deletions
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23
crates/hir/src/lib.rs
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@ -62,13 +62,13 @@ use hir_expand::{name::name, MacroCallKind};
use hir_ty::{
all_super_traits, autoderef,
consteval::{try_const_usize, unknown_const_as_generic, ConstEvalError, ConstExt},
diagnostics::BodyValidationDiagnostic,
diagnostics::BodyValidationDiagnostic, known_const_to_string,
layout::{Layout as TyLayout, RustcEnumVariantIdx, TagEncoding},
method_resolution::{self, TyFingerprint},
mir::{self, interpret_mir},
primitive::UintTy,
traits::FnTrait,
AliasTy, CallableDefId, CallableSig, Canonical, CanonicalVarKinds, Cast, ClosureId,
AliasTy, CallableDefId, CallableSig, Canonical, CanonicalVarKinds, Cast, ClosureId, GenericArg,
GenericArgData, Interner, ParamKind, QuantifiedWhereClause, Scalar, Substitution,
TraitEnvironment, TraitRefExt, Ty, TyBuilder, TyDefId, TyExt, TyKind, ValueTyDefId,
WhereClause,
@ -3142,12 +3142,8 @@ impl TypeParam {
}
pub fn default(self, db: &dyn HirDatabase) -> Option<Type> {
let params = db.generic_defaults(self.id.parent());
let local_idx = hir_ty::param_idx(db, self.id.into())?;
let ty = generic_arg_from_param(db, self.id.into())?;
let resolver = self.id.parent().resolver(db.upcast());
let ty = params.get(local_idx)?.clone();
let subst = TyBuilder::placeholder_subst(db, self.id.parent());
let ty = ty.substitute(Interner, &subst);
match ty.data(Interner) {
GenericArgData::Ty(it) => {
Some(Type::new_with_resolver_inner(db, &resolver, it.clone()))
@ -3209,6 +3205,19 @@ impl ConstParam {
pub fn ty(self, db: &dyn HirDatabase) -> Type {
Type::new(db, self.id.parent(), db.const_param_ty(self.id))
}
pub fn default(self, db: &dyn HirDatabase) -> Option<String> {
let arg = generic_arg_from_param(db, self.id.into())?;
known_const_to_string(arg.constant(Interner)?, db)
}
}
fn generic_arg_from_param(db: &dyn HirDatabase, id: TypeOrConstParamId) -> Option<GenericArg> {
let params = db.generic_defaults(id.parent);
let local_idx = hir_ty::param_idx(db, id)?;
let ty = params.get(local_idx)?.clone();
let subst = TyBuilder::placeholder_subst(db, id.parent);
Some(ty.substitute(Interner, &subst))
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]