bjoernager/rust
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Allow specifying alignment for functions

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This commit is contained in:
Wesley Norris 2021-01-20 21:49:04 -05:00
parent 138fd56cf9
commit 448d07683a
18 changed files with 137 additions and 83 deletions
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46
compiler/rustc_passes/src/check_attr.rs
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@ -1127,17 +1127,41 @@ impl CheckAttrVisitor<'tcx> {
let mut is_transparent = false;
for hint in &hints {
if !hint.is_meta_item() {
struct_span_err!(
self.tcx.sess,
hint.span(),
E0565,
"meta item in `repr` must be an identifier"
)
.emit();
continue;
}
let (article, allowed_targets) = match hint.name_or_empty() {
_ if !matches!(target, Target::Struct | Target::Enum | Target::Union) => {
("a", "struct, enum, or union")
}
name @ sym::C | name @ sym::align => {
is_c |= name == sym::C;
sym::C => {
is_c = true;
match target {
Target::Struct | Target::Union | Target::Enum => continue,
_ => ("a", "struct, enum, or union"),
}
}
sym::align => {
if let (Target::Fn, true) = (target, !self.tcx.features().fn_align) {
feature_err(
&self.tcx.sess.parse_sess,
sym::fn_align,
hint.span(),
"`repr(align)` attributes on functions are unstable",
)
.emit();
}
match target {
Target::Struct | Target::Union | Target::Enum | Target::Fn => continue,
_ => ("a", "struct, enum, function, or union"),
}
}
sym::packed => {
if target != Target::Struct && target != Target::Union {
("a", "struct or union")
@ -1194,7 +1218,17 @@ impl CheckAttrVisitor<'tcx> {
continue;
}
}
_ => continue,
_ => {
struct_span_err!(
self.tcx.sess,
hint.span(),
E0552,
"unrecognized representation hint"
)
.emit();
continue;
}
};
struct_span_err!(