bjoernager/rust
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Address review comments

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This commit is contained in:
Amanieu d'Antras 2021-02-25 00:09:33 +00:00
parent 00eca69bff
commit 2451f124c9
6 changed files with 78 additions and 90 deletions
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48
compiler/rustc_ast_lowering/src/expr.rs
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@ -44,7 +44,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
ExprKind::Tup(ref elts) => hir::ExprKind::Tup(self.lower_exprs(elts)),
ExprKind::Call(ref f, ref args) => {
if let Some(legacy_args) = self.legacy_const_generic_args(f) {
if let Some(legacy_args) = self.resolver.legacy_const_generic_args(f) {
self.lower_legacy_const_generics((**f).clone(), args.clone(), &legacy_args)
} else {
let f = self.lower_expr(f);
@ -298,39 +298,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
}
/// Checks if an expression refers to a function marked with
/// `#[rustc_legacy_const_generics]` and returns the argument index list
/// from the attribute.
fn legacy_const_generic_args(&mut self, expr: &Expr) -> Option<Vec<usize>> {
if let ExprKind::Path(None, path) = &expr.kind {
if path.segments.last().unwrap().args.is_some() {
return None;
}
if let Some(partial_res) = self.resolver.get_partial_res(expr.id) {
if partial_res.unresolved_segments() != 0 {
return None;
}
if let Res::Def(hir::def::DefKind::Fn, def_id) = partial_res.base_res() {
let attrs = self.item_attrs(def_id);
let attr = attrs
.iter()
.find(|a| self.sess.check_name(a, sym::rustc_legacy_const_generics))?;
let mut ret = vec![];
for meta in attr.meta_item_list()? {
match meta.literal()?.kind {
LitKind::Int(a, _) => {
ret.push(a as usize);
}
_ => panic!("invalid arg index"),
}
}
return Some(ret);
}
}
}
None
}
fn lower_legacy_const_generics(
&mut self,
mut f: Expr,
@ -366,12 +333,13 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
}
// Add generic args to the last element of the path
path.segments.last_mut().unwrap().args =
Some(AstP(GenericArgs::AngleBracketed(AngleBracketedArgs {
span: DUMMY_SP,
args: generic_args,
})));
// Add generic args to the last element of the path.
let last_segment = path.segments.last_mut().unwrap();
assert!(last_segment.args.is_none());
last_segment.args = Some(AstP(GenericArgs::AngleBracketed(AngleBracketedArgs {
span: DUMMY_SP,
args: generic_args,
})));
// Now lower everything as normal.
let f = self.lower_expr(&f);