Rollup merge of #145323 - scrabsha:push-pqwvmznzzmpr, r=jdonszelmann

Port the `#[linkage]` attribute to the new attribute system

r? `@jdonszelmann`

3 files changed, 23 insertions, 0 deletions

diff --git a/compiler/rustc_hir/src/attrs/data_structures.rs b/compiler/rustc_hir/src/attrs/data_structures.rs
index e02edf5fe24..510fc832978 100644
--- a/compiler/rustc_hir/src/attrs/data_structures.rs
+++ b/compiler/rustc_hir/src/attrs/data_structures.rs
@@ -187,6 +187,24 @@ pub enum CfgEntry {
     Version(Option<RustcVersion>, Span),
 }
 
+/// Possible values for the `#[linkage]` attribute, allowing to specify the
+/// linkage type for a `MonoItem`.
+///
+/// See <https://llvm.org/docs/LangRef.html#linkage-types> for more details about these variants.
+#[derive(Encodable, Decodable, Clone, Copy, Debug, PartialEq, Eq, Hash)]
+#[derive(HashStable_Generic, PrintAttribute)]
+pub enum Linkage {
+    AvailableExternally,
+    Common,
+    ExternalWeak,
+    External,
+    Internal,
+    LinkOnceAny,
+    LinkOnceODR,
+    WeakAny,
+    WeakODR,
+}
+
 /// Represents parsed *built-in* inert attributes.
 ///
 /// ## Overview
@@ -360,6 +378,9 @@ pub enum AttributeKind {
     /// Represents [`#[link_section]`](https://doc.rust-lang.org/reference/abi.html#the-link_section-attribute)
     LinkSection { name: Symbol, span: Span },
 
+    /// Represents `#[linkage]`.
+    Linkage(Linkage, Span),
+
     /// Represents `#[loop_match]`.
     LoopMatch(Span),
 
diff --git a/compiler/rustc_hir/src/attrs/encode_cross_crate.rs b/compiler/rustc_hir/src/attrs/encode_cross_crate.rs
index 7ce624dcc55..84a975523f2 100644
--- a/compiler/rustc_hir/src/attrs/encode_cross_crate.rs
+++ b/compiler/rustc_hir/src/attrs/encode_cross_crate.rs
@@ -46,6 +46,7 @@ impl AttributeKind {
             LinkName { .. } => Yes, // Needed for rustdoc
             LinkOrdinal { .. } => No,
             LinkSection { .. } => Yes, // Needed for rustdoc
+            Linkage(..) => No,
             LoopMatch(..) => No,
             MacroEscape(..) => No,
             MacroTransparency(..) => Yes,
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index e8feb721984..0cc03ef7b5b 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -1310,6 +1310,7 @@ impl AttributeExt for Attribute {
             Attribute::Parsed(AttributeKind::ShouldPanic { span, .. }) => *span,
             Attribute::Parsed(AttributeKind::AutomaticallyDerived(span)) => *span,
             Attribute::Parsed(AttributeKind::AllowInternalUnsafe(span)) => *span,
+            Attribute::Parsed(AttributeKind::Linkage(_, span)) => *span,
             a => panic!("can't get the span of an arbitrary parsed attribute: {a:?}"),
         }
     }