ObjectiveC IRGen. Replace _objc_empty_vtable pointer in Objective-C
class metadata for certain deployment targets. // rdar://14802916
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193359 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjCMac.cpp b/lib/CodeGen/CGObjCMac.cpp
index f761822..b720969 100644
--- a/lib/CodeGen/CGObjCMac.cpp
+++ b/lib/CodeGen/CGObjCMac.cpp
@@ -5757,6 +5757,9 @@
};
if (!Values[1])
Values[1] = llvm::Constant::getNullValue(ObjCTypes.ClassnfABIPtrTy);
+ if (!Values[3])
+ Values[3] = llvm::Constant::getNullValue(
+ llvm::PointerType::getUnqual(ObjCTypes.ImpnfABITy));
llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.ClassnfABITy,
Values);
llvm::GlobalVariable *GV = GetClassGlobal(ClassName);
@@ -5800,14 +5803,21 @@
llvm::GlobalValue::ExternalLinkage,
0,
"_objc_empty_cache");
-
- ObjCEmptyVtableVar = new llvm::GlobalVariable(
- CGM.getModule(),
- ObjCTypes.ImpnfABITy,
- false,
- llvm::GlobalValue::ExternalLinkage,
- 0,
- "_objc_empty_vtable");
+
+ // Make this entry NULL for any iOS device target, any iOS simulator target,
+ // OS X with deployment target 10.9 or later.
+ const llvm::Triple &Triple = CGM.getTarget().getTriple();
+ if (Triple.isiOS() || (Triple.isMacOSX() && !Triple.isMacOSXVersionLT(10, 9)))
+ // This entry will be null.
+ ObjCEmptyVtableVar = 0;
+ else
+ ObjCEmptyVtableVar = new llvm::GlobalVariable(
+ CGM.getModule(),
+ ObjCTypes.ImpnfABITy,
+ false,
+ llvm::GlobalValue::ExternalLinkage,
+ 0,
+ "_objc_empty_vtable");
}
assert(ID->getClassInterface() &&
"CGObjCNonFragileABIMac::GenerateClass - class is 0");