[clang] [ObjC] Set visibility of IvarOffsetGV when it is created in ObjCIvarOffsetVariable (PR #83726)

[via cfe-commits]

https://github.com/AtariDreams created https://github.com/llvm/llvm-project/pull/83726

It makes sense to set the visibility of the IvarOffsetGV when a new value for it is made in the heap.

>From 5396049175e77825c5e9de9296d3e8045b454dd6 Mon Sep 17 00:00:00 2001
From: Rose <83477269+AtariDreams at users.noreply.github.com>
Date: Fri, 1 Mar 2024 17:52:58 -0500
Subject: [PATCH] [ObjC] Set visibility of IvarOffsetGV when it is created in
 ObjCIvarOffsetVariable

It makes sense to set the visibility of the IvarOffsetGV when a new value for it is made in the heap.
---
 clang/lib/CodeGen/CGObjCMac.cpp | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 27d77e9a8a5511..cf472707d1794d 100644
--- a/clang/lib/CodeGen/CGObjCMac.cpp
+++ b/clang/lib/CodeGen/CGObjCMac.cpp
@@ -6826,10 +6826,9 @@ CGObjCNonFragileABIMac::ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
   Name += Ivar->getName();
   llvm::GlobalVariable *IvarOffsetGV = CGM.getModule().getGlobalVariable(Name);
   if (!IvarOffsetGV) {
-    IvarOffsetGV =
-        new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.IvarOffsetVarTy,
-                                 false, llvm::GlobalValue::ExternalLinkage,
-                                 nullptr, Name.str());
+    IvarOffsetGV = new llvm::GlobalVariable(
+        CGM.getModule(), ObjCTypes.IvarOffsetVarTy, false,
+        llvm::GlobalValue::ExternalLinkage, nullptr, Name.str());
     if (CGM.getTriple().isOSBinFormatCOFF()) {
       bool IsPrivateOrPackage =
           Ivar->getAccessControl() == ObjCIvarDecl::Private ||
@@ -6838,11 +6837,16 @@ CGObjCNonFragileABIMac::ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
       const ObjCInterfaceDecl *ContainingID = Ivar->getContainingInterface();
 
       if (ContainingID->hasAttr<DLLImportAttr>())
-        IvarOffsetGV
-            ->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
+        IvarOffsetGV->setDLLStorageClass(
+            llvm::GlobalValue::DLLImportStorageClass);
       else if (ContainingID->hasAttr<DLLExportAttr>() && !IsPrivateOrPackage)
-        IvarOffsetGV
-            ->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
+        IvarOffsetGV->setDLLStorageClass(
+            llvm::GlobalValue::DLLExportStorageClass);
+
+      if (IsPrivateOrPackage || ID->getVisibility() == HiddenVisibility)
+        IvarOffsetGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
+      else
+        IvarOffsetGV->setVisibility(llvm::GlobalValue::DefaultVisibility);
     }
   }
   return IvarOffsetGV;