From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 compiler/rustc_codegen_cranelift/src/linkage.rs | 36 +++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 compiler/rustc_codegen_cranelift/src/linkage.rs

(limited to 'compiler/rustc_codegen_cranelift/src/linkage.rs')

diff --git a/compiler/rustc_codegen_cranelift/src/linkage.rs b/compiler/rustc_codegen_cranelift/src/linkage.rs
new file mode 100644
index 000000000..ca853aac1
--- /dev/null
+++ b/compiler/rustc_codegen_cranelift/src/linkage.rs
@@ -0,0 +1,36 @@
+use rustc_middle::mir::mono::{Linkage as RLinkage, MonoItem, Visibility};
+
+use crate::prelude::*;
+
+pub(crate) fn get_clif_linkage(
+    mono_item: MonoItem<'_>,
+    linkage: RLinkage,
+    visibility: Visibility,
+    is_compiler_builtins: bool,
+) -> Linkage {
+    match (linkage, visibility) {
+        (RLinkage::External, Visibility::Default) if is_compiler_builtins => Linkage::Hidden,
+        (RLinkage::External, Visibility::Default) => Linkage::Export,
+        (RLinkage::Internal, Visibility::Default) => Linkage::Local,
+        (RLinkage::External, Visibility::Hidden) => Linkage::Hidden,
+        (RLinkage::WeakAny, Visibility::Default) => Linkage::Preemptible,
+        _ => panic!("{:?} = {:?} {:?}", mono_item, linkage, visibility),
+    }
+}
+
+pub(crate) fn get_static_linkage(tcx: TyCtxt<'_>, def_id: DefId) -> Linkage {
+    let fn_attrs = tcx.codegen_fn_attrs(def_id);
+
+    if let Some(linkage) = fn_attrs.linkage {
+        match linkage {
+            RLinkage::External => Linkage::Export,
+            RLinkage::Internal => Linkage::Local,
+            RLinkage::ExternalWeak | RLinkage::WeakAny => Linkage::Preemptible,
+            _ => panic!("{:?}", linkage),
+        }
+    } else if tcx.is_reachable_non_generic(def_id) {
+        Linkage::Export
+    } else {
+        Linkage::Hidden
+    }
+}
-- 
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