Port #[no_mangle] to new attribute parsing infrastructure

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs

@@ -56,3 +56,21 @@ impl<S: Stage> SingleAttributeParser<S> for ColdParser {
         Some(AttributeKind::Cold(cx.attr_span))
     }
 }
+
+pub(crate) struct NoMangleParser;
+
+impl<S: Stage> SingleAttributeParser<S> for NoMangleParser {
+    const PATH: &[rustc_span::Symbol] = &[sym::no_mangle];
+    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast;
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    const TEMPLATE: AttributeTemplate = template!(Word);
+
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
+        if !args.no_args() {
+            cx.expected_no_args(args.span().unwrap_or(cx.attr_span));
+            return None;
+        };
+
+        Some(AttributeKind::NoMangle(cx.attr_span))
+    }
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -15,7 +15,7 @@ use rustc_session::Session;
 use rustc_span::{DUMMY_SP, ErrorGuaranteed, Span, Symbol, sym};
 
 use crate::attributes::allow_unstable::{AllowConstFnUnstableParser, AllowInternalUnstableParser};
-use crate::attributes::codegen_attrs::{ColdParser, OptimizeParser};
+use crate::attributes::codegen_attrs::{ColdParser, NoMangleParser, OptimizeParser};
 use crate::attributes::confusables::ConfusablesParser;
 use crate::attributes::deprecation::DeprecationParser;
 use crate::attributes::inline::{InlineParser, RustcForceInlineParser};
@@ -114,6 +114,7 @@ attribute_parsers!(
         Single<InlineParser>,
         Single<MayDangleParser>,
         Single<MustUseParser>,
+        Single<NoMangleParser>,
         Single<OptimizeParser>,
         Single<PubTransparentParser>,
         Single<RustcForceInlineParser>,