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Simplify

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This commit is contained in:
Lukas Wirth 2022-04-15 21:25:44 +02:00
parent 17691ee974
commit f82d230081
1 changed files with 59 additions and 58 deletions
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117
crates/hir_ty/src/infer.rs
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@ -413,39 +413,70 @@ impl<'a> InferenceContext<'a> {
} }
} }
fn err_ty(&self) -> Ty { fn resolve_all(self) -> InferenceResult {
self.result.standard_types.unknown.clone() let InferenceContext { mut table, mut result, .. } = self;
}
fn resolve_all(mut self) -> InferenceResult {
// FIXME resolve obligations as well (use Guidance if necessary) // FIXME resolve obligations as well (use Guidance if necessary)
self.table.resolve_obligations_as_possible(); table.resolve_obligations_as_possible();
// make sure diverging type variables are marked as such // make sure diverging type variables are marked as such
self.table.propagate_diverging_flag(); table.propagate_diverging_flag();
let mut result = std::mem::take(&mut self.result);
for ty in result.type_of_expr.values_mut() { for ty in result.type_of_expr.values_mut() {
*ty = self.table.resolve_completely(ty.clone()); *ty = table.resolve_completely(ty.clone());
} }
for ty in result.type_of_pat.values_mut() { for ty in result.type_of_pat.values_mut() {
*ty = self.table.resolve_completely(ty.clone()); *ty = table.resolve_completely(ty.clone());
} }
for mismatch in result.type_mismatches.values_mut() { for mismatch in result.type_mismatches.values_mut() {
mismatch.expected = self.table.resolve_completely(mismatch.expected.clone()); mismatch.expected = table.resolve_completely(mismatch.expected.clone());
mismatch.actual = self.table.resolve_completely(mismatch.actual.clone()); mismatch.actual = table.resolve_completely(mismatch.actual.clone());
} }
for (_, subst) in result.method_resolutions.values_mut() { for (_, subst) in result.method_resolutions.values_mut() {
*subst = self.table.resolve_completely(subst.clone()); *subst = table.resolve_completely(subst.clone());
} }
for adjustment in result.expr_adjustments.values_mut().flatten() { for adjustment in result.expr_adjustments.values_mut().flatten() {
adjustment.target = self.table.resolve_completely(adjustment.target.clone()); adjustment.target = table.resolve_completely(adjustment.target.clone());
} }
for adjustment in result.pat_adjustments.values_mut().flatten() { for adjustment in result.pat_adjustments.values_mut().flatten() {
adjustment.target = self.table.resolve_completely(adjustment.target.clone()); adjustment.target = table.resolve_completely(adjustment.target.clone());
} }
result result
} }
fn collect_const(&mut self, data: &ConstData) {
self.return_ty = self.make_ty(&data.type_ref);
}
fn collect_static(&mut self, data: &StaticData) {
self.return_ty = self.make_ty(&data.type_ref);
}
fn collect_fn(&mut self, data: &FunctionData) {
let body = Arc::clone(&self.body); // avoid borrow checker problem
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)| 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);
self.infer_pat(*pat, &ty, BindingMode::default());
}
let error_ty = &TypeRef::Error;
let return_ty = if data.has_async_kw() {
data.async_ret_type.as_deref().unwrap_or(error_ty)
} else {
&*data.ret_type
};
let return_ty = self.make_ty_with_mode(return_ty, ImplTraitLoweringMode::Disallowed); // FIXME implement RPIT
self.return_ty = return_ty;
}
fn infer_body(&mut self) {
self.infer_expr_coerce(self.body.body_expr, &Expectation::has_type(self.return_ty.clone()));
}
fn write_expr_ty(&mut self, expr: ExprId, ty: Ty) { fn write_expr_ty(&mut self, expr: ExprId, ty: Ty) {
self.result.type_of_expr.insert(expr, ty); self.result.type_of_expr.insert(expr, ty);
} }
@ -491,6 +522,10 @@ impl<'a> InferenceContext<'a> {
self.make_ty_with_mode(type_ref, ImplTraitLoweringMode::Disallowed) self.make_ty_with_mode(type_ref, ImplTraitLoweringMode::Disallowed)
} }
fn err_ty(&self) -> Ty {
self.result.standard_types.unknown.clone()
}
/// Replaces ConstScalar::Unknown by a new type var, so we can maybe still infer it. /// Replaces ConstScalar::Unknown by a new type var, so we can maybe still infer it.
fn insert_const_vars_shallow(&mut self, c: Const) -> Const { fn insert_const_vars_shallow(&mut self, c: Const) -> Const {
let data = c.data(Interner); let data = c.data(Interner);
@ -544,6 +579,16 @@ impl<'a> InferenceContext<'a> {
self.table.unify(ty1, ty2) self.table.unify(ty1, ty2)
} }
/// Recurses through the given type, normalizing associated types mentioned
/// in it by replacing them by type variables and registering obligations to
/// resolve later. This should be done once for every type we get from some
/// type annotation (e.g. from a let type annotation, field type or function
/// call). `make_ty` handles this already, but e.g. for field types we need
/// to do it as well.
fn normalize_associated_types_in(&mut self, ty: Ty) -> Ty {
self.table.normalize_associated_types_in(ty)
}
fn resolve_ty_shallow(&mut self, ty: &Ty) -> Ty { fn resolve_ty_shallow(&mut self, ty: &Ty) -> Ty {
self.resolve_obligations_as_possible(); self.resolve_obligations_as_possible();
self.table.resolve_ty_shallow(ty) self.table.resolve_ty_shallow(ty)
@ -586,16 +631,6 @@ impl<'a> InferenceContext<'a> {
} }
} }
/// Recurses through the given type, normalizing associated types mentioned
/// in it by replacing them by type variables and registering obligations to
/// resolve later. This should be done once for every type we get from some
/// type annotation (e.g. from a let type annotation, field type or function
/// call). `make_ty` handles this already, but e.g. for field types we need
/// to do it as well.
fn normalize_associated_types_in(&mut self, ty: Ty) -> Ty {
self.table.normalize_associated_types_in(ty)
}
fn resolve_variant(&mut self, path: Option<&Path>, value_ns: bool) -> (Ty, Option<VariantId>) { fn resolve_variant(&mut self, path: Option<&Path>, value_ns: bool) -> (Ty, Option<VariantId>) {
let path = match path { let path = match path {
Some(path) => path, Some(path) => path,
@ -727,40 +762,6 @@ impl<'a> InferenceContext<'a> {
} }
} }
fn collect_const(&mut self, data: &ConstData) {
self.return_ty = self.make_ty(&data.type_ref);
}
fn collect_static(&mut self, data: &StaticData) {
self.return_ty = self.make_ty(&data.type_ref);
}
fn collect_fn(&mut self, data: &FunctionData) {
let body = Arc::clone(&self.body); // avoid borrow checker problem
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)| 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);
self.infer_pat(*pat, &ty, BindingMode::default());
}
let error_ty = &TypeRef::Error;
let return_ty = if data.has_async_kw() {
data.async_ret_type.as_deref().unwrap_or(error_ty)
} else {
&*data.ret_type
};
let return_ty = self.make_ty_with_mode(return_ty, ImplTraitLoweringMode::Disallowed); // FIXME implement RPIT
self.return_ty = return_ty;
}
fn infer_body(&mut self) {
self.infer_expr_coerce(self.body.body_expr, &Expectation::has_type(self.return_ty.clone()));
}
fn resolve_lang_item(&self, name: Name) -> Option<LangItemTarget> { fn resolve_lang_item(&self, name: Name) -> Option<LangItemTarget> {
let krate = self.resolver.krate(); let krate = self.resolver.krate();
self.db.lang_item(krate, name.to_smol_str()) self.db.lang_item(krate, name.to_smol_str())