[opaque pointer types] Pass function types for runtime function calls.

[jyknight]

Summary

Emit{Nounwind,}RuntimeCall{,OrInvoke} have been modified to take a
FunctionCallee as an argument, and CreateRuntimeFunction has been
modified to return a FunctionCallee. All callers have been updated.

Additionally, CreateBuiltinFunction is removed, as it was redundant
with CreateRuntimeFunction after some previous changes.

[dblaikie]

clang/lib/CodeGen/CGObjC.cpp

1028–1030 ↗

(On Diff #184982)

This code looks like it implies that the 'if' is never hit? (since cast doesn't propagate null (it asserts/fails/UB on null)) - should this be cast_or_null instead? Or "if(!CGM.getObjCRuntime().getPropertyGetFunction())" ?)

(there are a few similar instances later on)

[jyknight]

clang/lib/CodeGen/CGObjC.cpp

1028–1030 ↗

(On Diff #184982)

Indeed, good catch! I don't know if that actually happens, but this code also didn't even need these casts.

Removed the casts, both simplifying the code, and fixing that potential issue.

[jyknight]

Address comment.

[dblaikie]

Great - thanks!

lib/CodeGen/CGAtomic.cpp

 
 static RValue emitAtomicLibcall(CodeGenFunction &CGF,
                                 StringRef fnName,
                                 QualType resultType,
                                 CallArgList &args) {
   const CGFunctionInfo &fnInfo =
     CGF.CGM.getTypes().arrangeBuiltinFunctionCall(resultType, args);
   llvm::FunctionType *fnTy = CGF.CGM.getTypes().GetFunctionType(fnInfo);
-  llvm::Constant *fn = CGF.CGM.CreateRuntimeFunction(fnTy, fnName);
+  llvm::FunctionCallee fn = CGF.CGM.CreateRuntimeFunction(fnTy, fnName);
   auto callee = CGCallee::forDirect(fn);
   return CGF.EmitCall(fnInfo, callee, ReturnValueSlot(), args);
 }
 
 /// Does a store of the given IR type modify the full expected width?
 static bool isFullSizeType(CodeGenModule &CGM, llvm::Type *type,
                            uint64_t expectedSize) {
   return (CGM.getDataLayout().getTypeStoreSize(type) * 8 == expectedSize);

lib/CodeGen/CGBlocks.cpp

void emitCopy(CodeGenFunction &CGF, Address destField,
     destField = CGF.Builder.CreateBitCast(destField, CGF.VoidPtrTy);
 
     srcField = CGF.Builder.CreateBitCast(srcField, CGF.VoidPtrPtrTy);
     llvm::Value *srcValue = CGF.Builder.CreateLoad(srcField);
 
     unsigned flags = (Flags | BLOCK_BYREF_CALLER).getBitMask();
 
     llvm::Value *flagsVal = llvm::ConstantInt::get(CGF.Int32Ty, flags);
-    llvm::Value *fn = CGF.CGM.getBlockObjectAssign();
+    llvm::FunctionCallee fn = CGF.CGM.getBlockObjectAssign();
 
     llvm::Value *args[] = { destField.getPointer(), srcValue, flagsVal };
     CGF.EmitNounwindRuntimeCall(fn, args);
   }
 
   void emitDispose(CodeGenFunction &CGF, Address field) override {
     field = CGF.Builder.CreateBitCast(field, CGF.Int8PtrTy->getPointerTo(0));
     llvm::Value *value = CGF.Builder.CreateLoad(field);
void CodeGenFunction::emitByrefStructureInit(const AutoVarEmission &emission) {
   if (ByRefHasLifetime && HasByrefExtendedLayout) {
     auto layoutInfo = CGM.getObjCRuntime().BuildByrefLayout(CGM, type);
     storeHeaderField(layoutInfo, getPointerSize(), "byref.layout");
   }
 }
 
 void CodeGenFunction::BuildBlockRelease(llvm::Value *V, BlockFieldFlags flags,
                                         bool CanThrow) {
-  llvm::Value *F = CGM.getBlockObjectDispose();
+  llvm::FunctionCallee F = CGM.getBlockObjectDispose();
   llvm::Value *args[] = {
     Builder.CreateBitCast(V, Int8PtrTy),
     llvm::ConstantInt::get(Int32Ty, flags.getBitMask())
   };
 
   if (CanThrow)
     EmitRuntimeCallOrInvoke(F, args);
   else
static void configureBlocksRuntimeObject(CodeGenModule &CGM,
 
   if (CGM.getLangOpts().BlocksRuntimeOptional && GV->isDeclaration() &&
       GV->hasExternalLinkage())
     GV->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
 
   CGM.setDSOLocal(GV);
 }
 
-llvm::Constant *CodeGenModule::getBlockObjectDispose() {
+llvm::FunctionCallee CodeGenModule::getBlockObjectDispose() {
   if (BlockObjectDispose)
     return BlockObjectDispose;
 
   llvm::Type *args[] = { Int8PtrTy, Int32Ty };
   llvm::FunctionType *fty
     = llvm::FunctionType::get(VoidTy, args, false);
   BlockObjectDispose = CreateRuntimeFunction(fty, "_Block_object_dispose");
-  configureBlocksRuntimeObject(*this, BlockObjectDispose);
+  configureBlocksRuntimeObject(
+      *this, cast<llvm::Constant>(BlockObjectDispose.getCallee()));
   return BlockObjectDispose;
 }
 
-llvm::Constant *CodeGenModule::getBlockObjectAssign() {
+llvm::FunctionCallee CodeGenModule::getBlockObjectAssign() {
   if (BlockObjectAssign)
     return BlockObjectAssign;
 
   llvm::Type *args[] = { Int8PtrTy, Int8PtrTy, Int32Ty };
   llvm::FunctionType *fty
     = llvm::FunctionType::get(VoidTy, args, false);
   BlockObjectAssign = CreateRuntimeFunction(fty, "_Block_object_assign");
-  configureBlocksRuntimeObject(*this, BlockObjectAssign);
+  configureBlocksRuntimeObject(
+      *this, cast<llvm::Constant>(BlockObjectAssign.getCallee()));
   return BlockObjectAssign;
 }
 
 llvm::Constant *CodeGenModule::getNSConcreteGlobalBlock() {
   if (NSConcreteGlobalBlock)
     return NSConcreteGlobalBlock;
 
   NSConcreteGlobalBlock = GetOrCreateLLVMGlobal("_NSConcreteGlobalBlock",

lib/CodeGen/CGBuiltin.cpp

if (CGF.getTarget().getTriple().getArch() == llvm::Triple::aarch64) {
                                     llvm::ConstantInt::get(CGF.Int32Ty, 0));
   }
 
   // Mark the call site and declaration with ReturnsTwice.
   llvm::Type *ArgTypes[2] = {CGF.Int8PtrTy, Arg1Ty};
   llvm::AttributeList ReturnsTwiceAttr = llvm::AttributeList::get(
       CGF.getLLVMContext(), llvm::AttributeList::FunctionIndex,
       llvm::Attribute::ReturnsTwice);
-  llvm::Constant *SetJmpFn = CGF.CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee SetJmpFn = CGF.CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGF.IntTy, ArgTypes, IsVarArg), Name,
       ReturnsTwiceAttr, /*Local=*/true);
 
   llvm::Value *Buf = CGF.Builder.CreateBitOrPointerCast(
       CGF.EmitScalarExpr(E->getArg(0)), CGF.Int8PtrTy);
   llvm::Value *Args[] = {Buf, Arg1};
   llvm::CallBase *CB = CGF.EmitRuntimeCallOrInvoke(SetJmpFn, Args);
   CB->setAttributes(ReturnsTwiceAttr);
if (BuiltinID == Builtin::BI__atomic_is_lock_free)
       Args.add(RValue::get(EmitScalarExpr(E->getArg(1))),
                getContext().VoidPtrTy);
     else
       Args.add(RValue::get(llvm::Constant::getNullValue(VoidPtrTy)),
                getContext().VoidPtrTy);
     const CGFunctionInfo &FuncInfo =
         CGM.getTypes().arrangeBuiltinFunctionCall(E->getType(), Args);
     llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FuncInfo);
-    llvm::Constant *Func = CGM.CreateRuntimeFunction(FTy, LibCallName);
+    llvm::FunctionCallee Func = CGM.CreateRuntimeFunction(FTy, LibCallName);
     return EmitCall(FuncInfo, CGCallee::forDirect(Func),
                     ReturnValueSlot(), Args);
   }
 
   case Builtin::BI__atomic_test_and_set: {
     // Look at the argument type to determine whether this is a volatile
     // operation. The parameter type is always volatile.
     QualType PtrTy = E->getArg(0)->IgnoreImpCasts()->getType();
llvm::Value *CodeGenFunction::EmitX86CpuSupports(uint64_t FeaturesMask) {
   }
 
   return Result;
 }
 
 Value *CodeGenFunction::EmitX86CpuInit() {
   llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy,
                                                     /*Variadic*/ false);
-  llvm::Constant *Func = CGM.CreateRuntimeFunction(FTy, "__cpu_indicator_init");
-  cast<llvm::GlobalValue>(Func)->setDSOLocal(true);
-  cast<llvm::GlobalValue>(Func)->setDLLStorageClass(
-      llvm::GlobalValue::DefaultStorageClass);
+  llvm::FunctionCallee Func =
+      CGM.CreateRuntimeFunction(FTy, "__cpu_indicator_init");
+  cast<llvm::GlobalValue>(Func.getCallee())->setDSOLocal(true);
+  cast<llvm::GlobalValue>(Func.getCallee())
+      ->setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
   return Builder.CreateCall(Func);
 }
 
 Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
                                            const CallExpr *E) {
   if (BuiltinID == X86::BI__builtin_cpu_is)
     return EmitX86CpuIs(E);
   if (BuiltinID == X86::BI__builtin_cpu_supports)

lib/CodeGen/CGCUDANV.cpp

private:
   llvm::SmallVector<std::pair<llvm::GlobalVariable *, unsigned>, 16> DeviceVars;
   /// Keeps track of variable containing handle of GPU binary. Populated by
   /// ModuleCtorFunction() and used to create corresponding cleanup calls in
   /// ModuleDtorFunction()
   llvm::GlobalVariable *GpuBinaryHandle = nullptr;
   /// Whether we generate relocatable device code.
   bool RelocatableDeviceCode;
 
-  llvm::Constant *getSetupArgumentFn() const;
-  llvm::Constant *getLaunchFn() const;
+  llvm::FunctionCallee getSetupArgumentFn() const;
+  llvm::FunctionCallee getLaunchFn() const;
 
   llvm::FunctionType *getRegisterGlobalsFnTy() const;
   llvm::FunctionType *getCallbackFnTy() const;
   llvm::FunctionType *getRegisterLinkedBinaryFnTy() const;
   std::string addPrefixToName(StringRef FuncName) const;
   std::string addUnderscoredPrefixToName(StringRef FuncName) const;
 
   /// Creates a function to register all kernel stubs generated in this module.
CGNVCUDARuntime::CGNVCUDARuntime(CodeGenModule &CGM)
   SizeTy = CGM.SizeTy;
   VoidTy = CGM.VoidTy;
 
   CharPtrTy = llvm::PointerType::getUnqual(Types.ConvertType(Ctx.CharTy));
   VoidPtrTy = cast<llvm::PointerType>(Types.ConvertType(Ctx.VoidPtrTy));
   VoidPtrPtrTy = VoidPtrTy->getPointerTo();
 }
 
-llvm::Constant *CGNVCUDARuntime::getSetupArgumentFn() const {
+llvm::FunctionCallee CGNVCUDARuntime::getSetupArgumentFn() const {
   // cudaError_t cudaSetupArgument(void *, size_t, size_t)
   llvm::Type *Params[] = {VoidPtrTy, SizeTy, SizeTy};
   return CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(IntTy, Params, false),
       addPrefixToName("SetupArgument"));
 }
 
-llvm::Constant *CGNVCUDARuntime::getLaunchFn() const {
+llvm::FunctionCallee CGNVCUDARuntime::getLaunchFn() const {
   if (CGM.getLangOpts().HIP) {
     // hipError_t hipLaunchByPtr(char *);
     return CGM.CreateRuntimeFunction(
         llvm::FunctionType::get(IntTy, CharPtrTy, false), "hipLaunchByPtr");
   } else {
     // cudaError_t cudaLaunch(char *);
     return CGM.CreateRuntimeFunction(
         llvm::FunctionType::get(IntTy, CharPtrTy, false), "cudaLaunch");
void CGNVCUDARuntime::emitDeviceStubBodyNew(CodeGenFunction &CGF,
   Address GridDim =
       CGF.CreateMemTemp(Dim3Ty, CharUnits::fromQuantity(8), "grid_dim");
   Address BlockDim =
       CGF.CreateMemTemp(Dim3Ty, CharUnits::fromQuantity(8), "block_dim");
   Address ShmemSize =
       CGF.CreateTempAlloca(SizeTy, CGM.getSizeAlign(), "shmem_size");
   Address Stream =
       CGF.CreateTempAlloca(VoidPtrTy, CGM.getPointerAlign(), "stream");
-  llvm::Constant *cudaPopConfigFn = CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee cudaPopConfigFn = CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(IntTy,
                               {/*gridDim=*/GridDim.getType(),
                                /*blockDim=*/BlockDim.getType(),
                                /*ShmemSize=*/ShmemSize.getType(),
                                /*Stream=*/Stream.getType()},
                               /*isVarArg=*/false),
       "__cudaPopCallConfiguration");
 
void CGNVCUDARuntime::emitDeviceStubBodyNew(CodeGenFunction &CGF,
 
   QualType QT = cudaLaunchKernelFD->getType();
   QualType CQT = QT.getCanonicalType();
   llvm::Type *Ty = CGM.getTypes().ConvertType(CQT);
   llvm::FunctionType *FTy = dyn_cast<llvm::FunctionType>(Ty);
 
   const CGFunctionInfo &FI =
       CGM.getTypes().arrangeFunctionDeclaration(cudaLaunchKernelFD);
-  llvm::Constant *cudaLaunchKernelFn =
+  llvm::FunctionCallee cudaLaunchKernelFn =
       CGM.CreateRuntimeFunction(FTy, "cudaLaunchKernel");
   CGF.EmitCall(FI, CGCallee::forDirect(cudaLaunchKernelFn), ReturnValueSlot(),
                LaunchKernelArgs);
   CGF.EmitBranch(EndBlock);
 
   CGF.EmitBlock(EndBlock);
 }
 
 void CGNVCUDARuntime::emitDeviceStubBodyLegacy(CodeGenFunction &CGF,
                                                FunctionArgList &Args) {
   // Emit a call to cudaSetupArgument for each arg in Args.
-  llvm::Constant *cudaSetupArgFn = getSetupArgumentFn();
+  llvm::FunctionCallee cudaSetupArgFn = getSetupArgumentFn();
   llvm::BasicBlock *EndBlock = CGF.createBasicBlock("setup.end");
   CharUnits Offset = CharUnits::Zero();
   for (const VarDecl *A : Args) {
     CharUnits TyWidth, TyAlign;
     std::tie(TyWidth, TyAlign) =
         CGM.getContext().getTypeInfoInChars(A->getType());
     Offset = Offset.alignTo(TyAlign);
     llvm::Value *Args[] = {
         CGF.Builder.CreatePointerCast(CGF.GetAddrOfLocalVar(A).getPointer(),
                                       VoidPtrTy),
         llvm::ConstantInt::get(SizeTy, TyWidth.getQuantity()),
         llvm::ConstantInt::get(SizeTy, Offset.getQuantity()),
     };
     llvm::CallBase *CB = CGF.EmitRuntimeCallOrInvoke(cudaSetupArgFn, Args);
     llvm::Constant *Zero = llvm::ConstantInt::get(IntTy, 0);
     llvm::Value *CBZero = CGF.Builder.CreateICmpEQ(CB, Zero);
     llvm::BasicBlock *NextBlock = CGF.createBasicBlock("setup.next");
     CGF.Builder.CreateCondBr(CBZero, NextBlock, EndBlock);
     CGF.EmitBlock(NextBlock);
     Offset += TyWidth;
   }
 
   // Emit the call to cudaLaunch
-  llvm::Constant *cudaLaunchFn = getLaunchFn();
+  llvm::FunctionCallee cudaLaunchFn = getLaunchFn();
   llvm::Value *Arg = CGF.Builder.CreatePointerCast(CGF.CurFn, CharPtrTy);
   CGF.EmitRuntimeCallOrInvoke(cudaLaunchFn, Arg);
   CGF.EmitBranch(EndBlock);
 
   CGF.EmitBlock(EndBlock);
 }
 
 /// Creates a function that sets up state on the host side for CUDA objects that
llvm::Function *CGNVCUDARuntime::makeRegisterGlobalsFn() {
   CGBuilderTy Builder(CGM, Context);
   Builder.SetInsertPoint(EntryBB);
 
   // void __cudaRegisterFunction(void **, const char *, char *, const char *,
   //                             int, uint3*, uint3*, dim3*, dim3*, int*)
   llvm::Type *RegisterFuncParams[] = {
       VoidPtrPtrTy, CharPtrTy, CharPtrTy, CharPtrTy, IntTy,
       VoidPtrTy,    VoidPtrTy, VoidPtrTy, VoidPtrTy, IntTy->getPointerTo()};
-  llvm::Constant *RegisterFunc = CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee RegisterFunc = CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(IntTy, RegisterFuncParams, false),
       addUnderscoredPrefixToName("RegisterFunction"));
 
   // Extract GpuBinaryHandle passed as the first argument passed to
   // __cuda_register_globals() and generate __cudaRegisterFunction() call for
   // each emitted kernel.
   llvm::Argument &GpuBinaryHandlePtr = *RegisterKernelsFunc->arg_begin();
   for (llvm::Function *Kernel : EmittedKernels) {
     llvm::Constant *KernelName = makeConstantString(Kernel->getName());
     llvm::Constant *NullPtr = llvm::ConstantPointerNull::get(VoidPtrTy);
     llvm::Value *Args[] = {
         &GpuBinaryHandlePtr, Builder.CreateBitCast(Kernel, VoidPtrTy),
         KernelName, KernelName, llvm::ConstantInt::get(IntTy, -1), NullPtr,
         NullPtr, NullPtr, NullPtr,
         llvm::ConstantPointerNull::get(IntTy->getPointerTo())};
     Builder.CreateCall(RegisterFunc, Args);
   }
 
   // void __cudaRegisterVar(void **, char *, char *, const char *,
   //                        int, int, int, int)
   llvm::Type *RegisterVarParams[] = {VoidPtrPtrTy, CharPtrTy, CharPtrTy,
                                      CharPtrTy,    IntTy,     IntTy,
                                      IntTy,        IntTy};
-  llvm::Constant *RegisterVar = CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee RegisterVar = CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(IntTy, RegisterVarParams, false),
       addUnderscoredPrefixToName("RegisterVar"));
   for (auto &Pair : DeviceVars) {
     llvm::GlobalVariable *Var = Pair.first;
     unsigned Flags = Pair.second;
     llvm::Constant *VarName = makeConstantString(Var->getName());
     uint64_t VarSize =
         CGM.getDataLayout().getTypeAllocSize(Var->getValueType());
llvm::Function *CGNVCUDARuntime::makeModuleCtorFunction() {
   // void __{cuda|hip}_register_globals(void* handle);
   llvm::Function *RegisterGlobalsFunc = makeRegisterGlobalsFn();
   // We always need a function to pass in as callback. Create a dummy
   // implementation if we don't need to register anything.
   if (RelocatableDeviceCode && !RegisterGlobalsFunc)
     RegisterGlobalsFunc = makeDummyFunction(getRegisterGlobalsFnTy());
 
   // void ** __{cuda|hip}RegisterFatBinary(void *);
-  llvm::Constant *RegisterFatbinFunc = CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee RegisterFatbinFunc = CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(VoidPtrPtrTy, VoidPtrTy, false),
       addUnderscoredPrefixToName("RegisterFatBinary"));
   // struct { int magic, int version, void * gpu_binary, void * dont_care };
   llvm::StructType *FatbinWrapperTy =
       llvm::StructType::get(IntTy, IntTy, VoidPtrTy, VoidPtrTy);
 
   // Register GPU binary with the CUDA runtime, store returned handle in a
   // global variable and save a reference in GpuBinaryHandle to be cleaned up
if (IsHIP) {
     // Create an alias for the FatbinWrapper that nvcc will look for.
     llvm::GlobalAlias::create(llvm::GlobalValue::ExternalLinkage,
                               Twine("__fatbinwrap") + ModuleID, FatbinWrapper);
 
     // void __cudaRegisterLinkedBinary%ModuleID%(void (*)(void *), void *,
     // void *, void (*)(void **))
     SmallString<128> RegisterLinkedBinaryName("__cudaRegisterLinkedBinary");
     RegisterLinkedBinaryName += ModuleID;
-    llvm::Constant *RegisterLinkedBinaryFunc = CGM.CreateRuntimeFunction(
+    llvm::FunctionCallee RegisterLinkedBinaryFunc = CGM.CreateRuntimeFunction(
         getRegisterLinkedBinaryFnTy(), RegisterLinkedBinaryName);
 
     assert(RegisterGlobalsFunc && "Expecting at least dummy function!");
     llvm::Value *Args[] = {RegisterGlobalsFunc,
                            CtorBuilder.CreateBitCast(FatbinWrapper, VoidPtrTy),
                            ModuleIDConstant,
                            makeDummyFunction(getCallbackFnTy())};
     CtorBuilder.CreateCall(RegisterLinkedBinaryFunc, Args);
   }
 
   // Create destructor and register it with atexit() the way NVCC does it. Doing
   // it during regular destructor phase worked in CUDA before 9.2 but results in
   // double-free in 9.2.
   if (llvm::Function *CleanupFn = makeModuleDtorFunction()) {
     // extern "C" int atexit(void (*f)(void));
     llvm::FunctionType *AtExitTy =
         llvm::FunctionType::get(IntTy, CleanupFn->getType(), false);
-    llvm::Constant *AtExitFunc =
+    llvm::FunctionCallee AtExitFunc =
         CGM.CreateRuntimeFunction(AtExitTy, "atexit", llvm::AttributeList(),
                                   /*Local=*/true);
     CtorBuilder.CreateCall(AtExitFunc, CleanupFn);
   }
 
   CtorBuilder.CreateRetVoid();
   return ModuleCtorFunc;
 }

 /// }
 /// \endcode
 llvm::Function *CGNVCUDARuntime::makeModuleDtorFunction() {
   // No need for destructor if we don't have a handle to unregister.
   if (!GpuBinaryHandle)
     return nullptr;
 
   // void __cudaUnregisterFatBinary(void ** handle);
-  llvm::Constant *UnregisterFatbinFunc = CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee UnregisterFatbinFunc = CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(VoidTy, VoidPtrPtrTy, false),
       addUnderscoredPrefixToName("UnregisterFatBinary"));
 
   llvm::Function *ModuleDtorFunc = llvm::Function::Create(
       llvm::FunctionType::get(VoidTy, VoidPtrTy, false),
       llvm::GlobalValue::InternalLinkage,
       addUnderscoredPrefixToName("_module_dtor"), &TheModule);
 

lib/CodeGen/CGCall.h

static CGCallee forPseudoDestructor(const CXXPseudoDestructorExpr *E) {
       return result;
     }
 
     static CGCallee forDirect(llvm::Constant *functionPtr,
                         const CGCalleeInfo &abstractInfo = CGCalleeInfo()) {
       return CGCallee(abstractInfo, functionPtr);
     }
 
+    static CGCallee
+    forDirect(llvm::FunctionCallee functionPtr,
+              const CGCalleeInfo &abstractInfo = CGCalleeInfo()) {
+      return CGCallee(abstractInfo, functionPtr.getCallee());
+    }
+
     static CGCallee forVirtual(const CallExpr *CE, GlobalDecl MD, Address Addr,
                                llvm::FunctionType *FTy) {
       CGCallee result(SpecialKind::Virtual);
       result.VirtualInfo.CE = CE;
       result.VirtualInfo.MD = MD;
       result.VirtualInfo.Addr = Addr;
       result.VirtualInfo.FTy = FTy;
       return result;

lib/CodeGen/CGCall.cpp

CodeGenFunction::AddObjCARCExceptionMetadata(llvm::Instruction *Inst) {
   if (CGM.getCodeGenOpts().OptimizationLevel != 0 &&
       !CGM.getCodeGenOpts().ObjCAutoRefCountExceptions)
     Inst->setMetadata("clang.arc.no_objc_arc_exceptions",
                       CGM.getNoObjCARCExceptionsMetadata());
 }
 
 /// Emits a call to the given no-arguments nounwind runtime function.
 llvm::CallInst *
-CodeGenFunction::EmitNounwindRuntimeCall(llvm::Value *callee,
+CodeGenFunction::EmitNounwindRuntimeCall(llvm::FunctionCallee callee,
                                          const llvm::Twine &name) {
   return EmitNounwindRuntimeCall(callee, None, name);
 }
 
 /// Emits a call to the given nounwind runtime function.
 llvm::CallInst *
-CodeGenFunction::EmitNounwindRuntimeCall(llvm::Value *callee,
-                                         ArrayRef<llvm::Value*> args,
+CodeGenFunction::EmitNounwindRuntimeCall(llvm::FunctionCallee callee,
+                                         ArrayRef<llvm::Value *> args,
                                          const llvm::Twine &name) {
   llvm::CallInst *call = EmitRuntimeCall(callee, args, name);
   call->setDoesNotThrow();
   return call;
 }
 
 /// Emits a simple call (never an invoke) to the given no-arguments
 /// runtime function.
-llvm::CallInst *
-CodeGenFunction::EmitRuntimeCall(llvm::Value *callee,
+llvm::CallInst *CodeGenFunction::EmitRuntimeCall(llvm::FunctionCallee callee,
                                                  const llvm::Twine &name) {
   return EmitRuntimeCall(callee, None, name);
 }
 
 // Calls which may throw must have operand bundles indicating which funclet
 // they are nested within.
 SmallVector<llvm::OperandBundleDef, 1>
 CodeGenFunction::getBundlesForFunclet(llvm::Value *Callee) {
   SmallVector<llvm::OperandBundleDef, 1> BundleList;
   // There is no need for a funclet operand bundle if we aren't inside a
   // funclet.
   if (!CurrentFuncletPad)
     return BundleList;
 
   // Skip intrinsics which cannot throw.
   auto *CalleeFn = dyn_cast<llvm::Function>(Callee->stripPointerCasts());
   if (CalleeFn && CalleeFn->isIntrinsic() && CalleeFn->doesNotThrow())
     return BundleList;
 
   BundleList.emplace_back("funclet", CurrentFuncletPad);
   return BundleList;
 }
 
 /// Emits a simple call (never an invoke) to the given runtime function.
-llvm::CallInst *
-CodeGenFunction::EmitRuntimeCall(llvm::Value *callee,
-                                 ArrayRef<llvm::Value*> args,
+llvm::CallInst *CodeGenFunction::EmitRuntimeCall(llvm::FunctionCallee callee,
+                                                 ArrayRef<llvm::Value *> args,
                                                  const llvm::Twine &name) {
-  llvm::CallInst *call =
-      Builder.CreateCall(callee, args, getBundlesForFunclet(callee), name);
+  llvm::CallInst *call = Builder.CreateCall(
+      callee, args, getBundlesForFunclet(callee.getCallee()), name);
   call->setCallingConv(getRuntimeCC());
   return call;
 }
 
 /// Emits a call or invoke to the given noreturn runtime function.
-void CodeGenFunction::EmitNoreturnRuntimeCallOrInvoke(llvm::Value *callee,
-                                               ArrayRef<llvm::Value*> args) {
+void CodeGenFunction::EmitNoreturnRuntimeCallOrInvoke(
+    llvm::FunctionCallee callee, ArrayRef<llvm::Value *> args) {
   SmallVector<llvm::OperandBundleDef, 1> BundleList =
-      getBundlesForFunclet(callee);
+      getBundlesForFunclet(callee.getCallee());
 
   if (getInvokeDest()) {
     llvm::InvokeInst *invoke =
       Builder.CreateInvoke(callee,
                            getUnreachableBlock(),
                            getInvokeDest(),
                            args,
                            BundleList);
     invoke->setDoesNotReturn();
     invoke->setCallingConv(getRuntimeCC());
   } else {
     llvm::CallInst *call = Builder.CreateCall(callee, args, BundleList);
     call->setDoesNotReturn();
     call->setCallingConv(getRuntimeCC());
     Builder.CreateUnreachable();
   }
 }
 
 /// Emits a call or invoke instruction to the given nullary runtime function.
-llvm::CallBase *CodeGenFunction::EmitRuntimeCallOrInvoke(llvm::Value *callee,
-                                                         const Twine &name) {
+llvm::CallBase *
+CodeGenFunction::EmitRuntimeCallOrInvoke(llvm::FunctionCallee callee,
   return EmitRuntimeCallOrInvoke(callee, None, name);
 }
 
 /// Emits a call or invoke instruction to the given runtime function.
-llvm::CallBase *CodeGenFunction::EmitRuntimeCallOrInvoke(
-    llvm::Value *callee, ArrayRef<llvm::Value *> args, const Twine &name) {
+llvm::CallBase *
+CodeGenFunction::EmitRuntimeCallOrInvoke(llvm::FunctionCallee callee,
+                                         ArrayRef<llvm::Value *> args,
+                                         const Twine &name) {
   llvm::CallBase *call = EmitCallOrInvoke(callee, args, name);
   call->setCallingConv(getRuntimeCC());
   return call;
 }
 
 /// Emits a call or invoke instruction to the given function, depending
 /// on the current state of the EH stack.
-llvm::CallBase *CodeGenFunction::EmitCallOrInvoke(llvm::Value *Callee,
+llvm::CallBase *CodeGenFunction::EmitCallOrInvoke(llvm::FunctionCallee Callee,
                                                   ArrayRef<llvm::Value *> Args,
                                                   const Twine &Name) {
   llvm::BasicBlock *InvokeDest = getInvokeDest();
   SmallVector<llvm::OperandBundleDef, 1> BundleList =
-      getBundlesForFunclet(Callee);
+      getBundlesForFunclet(Callee.getCallee());
 
   llvm::CallBase *Inst;
   if (!InvokeDest)
     Inst = Builder.CreateCall(Callee, Args, BundleList, Name);
   else {
     llvm::BasicBlock *ContBB = createBasicBlock("invoke.cont");
     Inst = Builder.CreateInvoke(Callee, ContBB, InvokeDest, Args, BundleList,
                                 Name);
if (SanOpts.has(SanitizerKind::Unreachable)) {
       // Avoid incompatibility with ASan which relies on the `noreturn`
       // attribute to insert handler calls.
       if (SanOpts.hasOneOf(SanitizerKind::Address |
                            SanitizerKind::KernelAddress)) {
         SanitizerScope SanScope(this);
         llvm::IRBuilder<>::InsertPointGuard IPGuard(Builder);
         Builder.SetInsertPoint(CI);
         auto *FnType = llvm::FunctionType::get(CGM.VoidTy, /*isVarArg=*/false);
-        auto *Fn = CGM.CreateRuntimeFunction(FnType, "__asan_handle_no_return");
+        llvm::FunctionCallee Fn =
+            CGM.CreateRuntimeFunction(FnType, "__asan_handle_no_return");
         EmitNounwindRuntimeCall(Fn);
       }
     }
 
     EmitUnreachable(Loc);
     Builder.ClearInsertionPoint();
 
     // FIXME: For now, emit a dummy basic block because expr emitters in

lib/CodeGen/CGClass.cpp

void CodeGenFunction::EmitAsanPrologueOrEpilogue(bool Prologue) {
   assert(NumFields == SSV.size());
   if (SSV.size() <= 1) return;
 
   // We will insert calls to __asan_* run-time functions.
   // LLVM AddressSanitizer pass may decide to inline them later.
   llvm::Type *Args[2] = {IntPtrTy, IntPtrTy};
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(CGM.VoidTy, Args, false);
-  llvm::Constant *F = CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee F = CGM.CreateRuntimeFunction(
       FTy, Prologue ? "__asan_poison_intra_object_redzone"
                     : "__asan_unpoison_intra_object_redzone");
 
   llvm::Value *ThisPtr = LoadCXXThis();
   ThisPtr = Builder.CreatePtrToInt(ThisPtr, IntPtrTy);
   uint64_t TypeSize = Info.getNonVirtualSize().getQuantity();
   // For each field check if it has sufficient padding,
   // if so (un)poison it with a call.
static void EmitSanitizerDtorCallback(CodeGenFunction &CGF, llvm::Value *Ptr,
    // function
    llvm::Value *Args[] = {CGF.Builder.CreateBitCast(Ptr, CGF.VoidPtrTy),
                           llvm::ConstantInt::get(CGF.SizeTy, PoisonSize)};
 
    llvm::Type *ArgTypes[] = {CGF.VoidPtrTy, CGF.SizeTy};
 
    llvm::FunctionType *FnType =
        llvm::FunctionType::get(CGF.VoidTy, ArgTypes, false);
-   llvm::Value *Fn =
+   llvm::FunctionCallee Fn =
        CGF.CGM.CreateRuntimeFunction(FnType, "__sanitizer_dtor_callback");
    CGF.EmitNounwindRuntimeCall(Fn, Args);
  }
 
   class SanitizeDtorMembers final : public EHScopeStack::Cleanup {
     const CXXDestructorDecl *Dtor;
 
   public:

lib/CodeGen/CGDeclCXX.cpp

void CodeGenFunction::registerGlobalDtorWithAtExit(const VarDecl &VD,
   registerGlobalDtorWithAtExit(dtorStub);
 }
 
 void CodeGenFunction::registerGlobalDtorWithAtExit(llvm::Constant *dtorStub) {
   // extern "C" int atexit(void (*f)(void));
   llvm::FunctionType *atexitTy =
     llvm::FunctionType::get(IntTy, dtorStub->getType(), false);
 
-  llvm::Constant *atexit =
+  llvm::FunctionCallee atexit =
       CGM.CreateRuntimeFunction(atexitTy, "atexit", llvm::AttributeList(),
                                 /*Local=*/true);
-  if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit))
+  if (llvm::Function *atexitFn = dyn_cast<llvm::Function>(atexit.getCallee()))
     atexitFn->setDoesNotThrow();
 
   EmitNounwindRuntimeCall(atexit, dtorStub);
 }
 
 void CodeGenFunction::EmitCXXGuardedInit(const VarDecl &D,
                                          llvm::GlobalVariable *DeclPtr,
                                          bool PerformInit) {

lib/CodeGen/CGException.cpp

 #include "clang/Basic/TargetBuiltins.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/Support/SaveAndRestore.h"
 
 using namespace clang;
 using namespace CodeGen;
 
-static llvm::Constant *getFreeExceptionFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getFreeExceptionFn(CodeGenModule &CGM) {
   // void __cxa_free_exception(void *thrown_exception);
 
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_free_exception");
 }
 
-static llvm::Constant *getUnexpectedFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getUnexpectedFn(CodeGenModule &CGM) {
   // void __cxa_call_unexpected(void *thrown_exception);
 
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_call_unexpected");
 }
 
-llvm::Constant *CodeGenModule::getTerminateFn() {
+llvm::FunctionCallee CodeGenModule::getTerminateFn() {
   // void __terminate();
 
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(VoidTy, /*IsVarArgs=*/false);
 
   StringRef name;
 
   // In C++, use std::terminate().
llvm::FunctionCallee CodeGenModule::getTerminateFn() {
   } else if (getLangOpts().ObjC &&
              getLangOpts().ObjCRuntime.hasTerminate())
     name = "objc_terminate";
   else
     name = "abort";
   return CreateRuntimeFunction(FTy, name);
 }
 
-static llvm::Constant *getCatchallRethrowFn(CodeGenModule &CGM,
+static llvm::FunctionCallee getCatchallRethrowFn(CodeGenModule &CGM,
                                                  StringRef Name) {
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, Name);
 }
 
 const EHPersonality EHPersonality::GNU_C = { "__gcc_personality_v0", nullptr };
 const EHPersonality
const EHPersonality &EHPersonality::get(CodeGenFunction &CGF) {
   const auto *FD = CGF.CurCodeDecl;
   // For outlined finallys and filters, use the SEH personality in case they
   // contain more SEH. This mostly only affects finallys. Filters could
   // hypothetically use gnu statement expressions to sneak in nested SEH.
   FD = FD ? FD : CGF.CurSEHParent;
   return get(CGF.CGM, dyn_cast_or_null<FunctionDecl>(FD));
 }
 
-static llvm::Constant *getPersonalityFn(CodeGenModule &CGM,
+static llvm::FunctionCallee getPersonalityFn(CodeGenModule &CGM,
                                              const EHPersonality &Personality) {
   return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.Int32Ty, true),
                                    Personality.PersonalityFn,
                                    llvm::AttributeList(), /*Local=*/true);
 }
 
 static llvm::Constant *getOpaquePersonalityFn(CodeGenModule &CGM,
                                         const EHPersonality &Personality) {
-  llvm::Constant *Fn = getPersonalityFn(CGM, Personality);
+  llvm::FunctionCallee Fn = getPersonalityFn(CGM, Personality);
   llvm::PointerType* Int8PtrTy = llvm::PointerType::get(
       llvm::Type::getInt8Ty(CGM.getLLVMContext()),
       CGM.getDataLayout().getProgramAddressSpace());
 
-  return llvm::ConstantExpr::getBitCast(Fn, Int8PtrTy);
+  return llvm::ConstantExpr::getBitCast(cast<llvm::Constant>(Fn.getCallee()),
+                                        Int8PtrTy);
 }
 
 /// Check whether a landingpad instruction only uses C++ features.
 static bool LandingPadHasOnlyCXXUses(llvm::LandingPadInst *LPI) {
   for (unsigned I = 0, E = LPI->getNumClauses(); I != E; ++I) {
     // Look for something that would've been returned by the ObjC
     // runtime's GetEHType() method.
     llvm::Value *Val = LPI->getClause(I)->stripPointerCasts();
void CodeGenModule::SimplifyPersonality() {
   // Nothing to do if it's unused.
   if (!Fn || Fn->use_empty()) return;
 
   // Can't do the optimization if it has non-C++ uses.
   if (!PersonalityHasOnlyCXXUses(Fn)) return;
 
   // Create the C++ personality function and kill off the old
   // function.
-  llvm::Constant *CXXFn = getPersonalityFn(*this, CXX);
+  llvm::FunctionCallee CXXFn = getPersonalityFn(*this, CXX);
 
   // This can happen if the user is screwing with us.
-  if (Fn->getType() != CXXFn->getType()) return;
+  if (Fn->getType() != CXXFn.getCallee()->getType())
+    return;
 
-  Fn->replaceAllUsesWith(CXXFn);
+  Fn->replaceAllUsesWith(CXXFn.getCallee());
   Fn->eraseFromParent();
 }
 
 /// Returns the value to inject into a selector to indicate the
 /// presence of a catch-all.
 static llvm::Constant *getCatchAllValue(CodeGenFunction &CGF) {
   // Possibly we should use @llvm.eh.catch.all.value here.
   return llvm::ConstantPointerNull::get(CGF.Int8PtrTy);
void CodeGenFunction::ExitCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock) {
 
   EmitBlock(ContBB);
   incrementProfileCounter(&S);
 }
 
 namespace {
   struct CallEndCatchForFinally final : EHScopeStack::Cleanup {
     llvm::Value *ForEHVar;
-    llvm::Value *EndCatchFn;
-    CallEndCatchForFinally(llvm::Value *ForEHVar, llvm::Value *EndCatchFn)
+    llvm::FunctionCallee EndCatchFn;
+    CallEndCatchForFinally(llvm::Value *ForEHVar,
+                           llvm::FunctionCallee EndCatchFn)
         : ForEHVar(ForEHVar), EndCatchFn(EndCatchFn) {}
 
     void Emit(CodeGenFunction &CGF, Flags flags) override {
       llvm::BasicBlock *EndCatchBB = CGF.createBasicBlock("finally.endcatch");
       llvm::BasicBlock *CleanupContBB =
         CGF.createBasicBlock("finally.cleanup.cont");
 
       llvm::Value *ShouldEndCatch =
         CGF.Builder.CreateFlagLoad(ForEHVar, "finally.endcatch");
       CGF.Builder.CreateCondBr(ShouldEndCatch, EndCatchBB, CleanupContBB);
       CGF.EmitBlock(EndCatchBB);
       CGF.EmitRuntimeCallOrInvoke(EndCatchFn); // catch-all, so might throw
       CGF.EmitBlock(CleanupContBB);
     }
   };
 
   struct PerformFinally final : EHScopeStack::Cleanup {
     const Stmt *Body;
     llvm::Value *ForEHVar;
-    llvm::Value *EndCatchFn;
-    llvm::Value *RethrowFn;
+    llvm::FunctionCallee EndCatchFn;
+    llvm::FunctionCallee RethrowFn;
     llvm::Value *SavedExnVar;
 
     PerformFinally(const Stmt *Body, llvm::Value *ForEHVar,
-                   llvm::Value *EndCatchFn,
-                   llvm::Value *RethrowFn, llvm::Value *SavedExnVar)
+                   llvm::FunctionCallee EndCatchFn,
+                   llvm::FunctionCallee RethrowFn, llvm::Value *SavedExnVar)
         : Body(Body), ForEHVar(ForEHVar), EndCatchFn(EndCatchFn),
           RethrowFn(RethrowFn), SavedExnVar(SavedExnVar) {}
 
     void Emit(CodeGenFunction &CGF, Flags flags) override {
       // Enter a cleanup to call the end-catch function if one was provided.
       if (EndCatchFn)
         CGF.EHStack.pushCleanup<CallEndCatchForFinally>(NormalAndEHCleanup,
                                                         ForEHVar, EndCatchFn);
 
       // Save the current cleanup destination in case there are
void Emit(CodeGenFunction &CGF, Flags flags) override {
       CGF.EnsureInsertPoint();
     }
   };
 } // end anonymous namespace
 
 /// Enters a finally block for an implementation using zero-cost
 /// exceptions.  This is mostly general, but hard-codes some
 /// language/ABI-specific behavior in the catch-all sections.
-void CodeGenFunction::FinallyInfo::enter(CodeGenFunction &CGF,
-                                         const Stmt *body,
-                                         llvm::Constant *beginCatchFn,
-                                         llvm::Constant *endCatchFn,
-                                         llvm::Constant *rethrowFn) {
-  assert((beginCatchFn != nullptr) == (endCatchFn != nullptr) &&
+void CodeGenFunction::FinallyInfo::enter(CodeGenFunction &CGF, const Stmt *body,
+                                         llvm::FunctionCallee beginCatchFn,
+                                         llvm::FunctionCallee endCatchFn,
+                                         llvm::FunctionCallee rethrowFn) {
+  assert((!!beginCatchFn) == (!!endCatchFn) &&
          "begin/end catch functions not paired");
   assert(rethrowFn && "rethrow function is required");
 
   BeginCatchFn = beginCatchFn;
 
   // The rethrow function has one of the following two types:
   //   void (*)()
   //   void (*)(void*)
   // In the latter case we need to pass it the exception object.
   // But we can't use the exception slot because the @finally might
   // have a landing pad (which would overwrite the exception slot).
-  llvm::FunctionType *rethrowFnTy =
-    cast<llvm::FunctionType>(
-      cast<llvm::PointerType>(rethrowFn->getType())->getElementType());
+  llvm::FunctionType *rethrowFnTy = rethrowFn.getFunctionType();
   SavedExnVar = nullptr;
   if (rethrowFnTy->getNumParams())
     SavedExnVar = CGF.CreateTempAlloca(CGF.Int8PtrTy, "finally.exn");
 
   // A finally block is a statement which must be executed on any edge
   // out of a given scope.  Unlike a cleanup, the finally block may
   // contain arbitrary control flow leading out of itself.  In
   // addition, finally blocks should always be executed, even if there

lib/CodeGen/CGExpr.cpp

static void emitCheckHandlerCall(CodeGenFunction &CGF,
 
   llvm::AttrBuilder B;
   if (!MayReturn) {
     B.addAttribute(llvm::Attribute::NoReturn)
         .addAttribute(llvm::Attribute::NoUnwind);
   }
   B.addAttribute(llvm::Attribute::UWTable);
 
-  llvm::Value *Fn = CGF.CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(
       FnType, FnName,
       llvm::AttributeList::get(CGF.getLLVMContext(),
                                llvm::AttributeList::FunctionIndex, B),
       /*Local=*/true);
   llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
   if (!MayReturn) {
     HandlerCall->setDoesNotReturn();
     CGF.Builder.CreateUnreachable();

lib/CodeGen/CGExprComplex.cpp

EPI = EPI.withExceptionSpec(
       FunctionProtoType::ExceptionSpecInfo(EST_BasicNoexcept));
   SmallVector<QualType, 4> ArgsQTys(
       4, Op.Ty->castAs<ComplexType>()->getElementType());
   QualType FQTy = CGF.getContext().getFunctionType(Op.Ty, ArgsQTys, EPI);
   const CGFunctionInfo &FuncInfo = CGF.CGM.getTypes().arrangeFreeFunctionCall(
       Args, cast<FunctionType>(FQTy.getTypePtr()), false);
 
   llvm::FunctionType *FTy = CGF.CGM.getTypes().GetFunctionType(FuncInfo);
-  llvm::Constant *Func = CGF.CGM.CreateBuiltinFunction(FTy, LibCallName);
+  llvm::FunctionCallee Func = CGF.CGM.CreateRuntimeFunction(
+      FTy, LibCallName, llvm::AttributeList(), true);
   CGCallee Callee = CGCallee::forDirect(Func, FQTy->getAs<FunctionProtoType>());
 
   llvm::CallBase *Call;
   RValue Res = CGF.EmitCall(FuncInfo, Callee, ReturnValueSlot(), Args, &Call);
   Call->setCallingConv(CGF.CGM.getRuntimeCC());
   return Res.getComplexVal();
 }
 

lib/CodeGen/CGExprScalar.cpp

Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
   // result, if it returns.
   Builder.SetInsertPoint(overflowBB);
 
   // Get the overflow handler.
   llvm::Type *Int8Ty = CGF.Int8Ty;
   llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
   llvm::FunctionType *handlerTy =
       llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
-  llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
+  llvm::FunctionCallee handler =
+      CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
 
   // Sign extend the args to 64-bit, so that we can use the same handler for
   // all types of overflow.
   llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
   llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
 
   // Call the handler with the two arguments, the operation, and the size of
   // the result.

lib/CodeGen/CGObjC.cpp

static void emitStructGetterCall(CodeGenFunction &CGF, ObjCIvarDecl *ivar,
   src = CGF.Builder.CreateBitCast(src, CGF.VoidPtrTy);
   args.add(RValue::get(src.getPointer()), Context.VoidPtrTy);
 
   CharUnits size = CGF.getContext().getTypeSizeInChars(ivar->getType());
   args.add(RValue::get(CGF.CGM.getSize(size)), Context.getSizeType());
   args.add(RValue::get(CGF.Builder.getInt1(isAtomic)), Context.BoolTy);
   args.add(RValue::get(CGF.Builder.getInt1(hasStrong)), Context.BoolTy);
 
-  llvm::Constant *fn = CGF.CGM.getObjCRuntime().GetGetStructFunction();
+  llvm::FunctionCallee fn = CGF.CGM.getObjCRuntime().GetGetStructFunction();
   CGCallee callee = CGCallee::forDirect(fn);
   CGF.EmitCall(CGF.getTypes().arrangeBuiltinFunctionCall(Context.VoidTy, args),
                callee, ReturnValueSlot(), args);
 }
 
 /// Determine whether the given architecture supports unaligned atomic
 /// accesses.  They don't have to be fast, just faster than a function
 /// call and a mutex.
llvm::Value *ivarAddr =
     CGF.EmitLValueForIvar(CGF.TypeOfSelfObject(),
                           CGF.LoadObjCSelf(), ivar, 0).getPointer();
   ivarAddr = CGF.Builder.CreateBitCast(ivarAddr, CGF.Int8PtrTy);
   args.add(RValue::get(ivarAddr), CGF.getContext().VoidPtrTy);
 
   // Third argument is the helper function.
   args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
 
-  llvm::Constant *copyCppAtomicObjectFn =
+  llvm::FunctionCallee copyCppAtomicObjectFn =
       CGF.CGM.getObjCRuntime().GetCppAtomicObjectGetFunction();
   CGCallee callee = CGCallee::forDirect(copyCppAtomicObjectFn);
   CGF.EmitCall(
       CGF.getTypes().arrangeBuiltinFunctionCall(CGF.getContext().VoidTy, args),
                callee, ReturnValueSlot(), args);
 }
 
 void
 CodeGenFunction::generateObjCGetterBody(const ObjCImplementationDecl *classImpl,
Builder.CreateStore(ivarVal,
                         Builder.CreateBitCast(ReturnValue, bitcastType));
 
     // Make sure we don't do an autorelease.
     AutoreleaseResult = false;
     return;
   }
 
   case PropertyImplStrategy::GetSetProperty: {
-    llvm::Constant *getPropertyFn =
+    llvm::FunctionCallee getPropertyFn =
         CGM.getObjCRuntime().GetPropertyGetFunction();
     if (!getPropertyFn) {
       CGM.ErrorUnsupported(propImpl, "Obj-C getter requiring atomic copy");
       return;
     }
     CGCallee callee = CGCallee::forDirect(getPropertyFn);
 
     // Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true).
     // FIXME: Can't this be simpler? This might even be worse than the
static void emitStructSetterCall(CodeGenFunction &CGF, ObjCMethodDecl *OMD,
 
   // The fourth argument is the 'isAtomic' flag.
   args.add(RValue::get(CGF.Builder.getTrue()), CGF.getContext().BoolTy);
 
   // The fifth argument is the 'hasStrong' flag.
   // FIXME: should this really always be false?
   args.add(RValue::get(CGF.Builder.getFalse()), CGF.getContext().BoolTy);
 
-  llvm::Constant *fn = CGF.CGM.getObjCRuntime().GetSetStructFunction();
+  llvm::FunctionCallee fn = CGF.CGM.getObjCRuntime().GetSetStructFunction();
   CGCallee callee = CGCallee::forDirect(fn);
   CGF.EmitCall(
       CGF.getTypes().arrangeBuiltinFunctionCall(CGF.getContext().VoidTy, args),
                callee, ReturnValueSlot(), args);
 }
 
 /// emitCPPObjectAtomicSetterCall - Call the runtime function to store
 /// the value from the first formal parameter into the given ivar, using
DeclRefExpr argRef(CGF.getContext(), argVar, false,
                      SourceLocation());
   llvm::Value *argAddr = CGF.EmitLValue(&argRef).getPointer();
   argAddr = CGF.Builder.CreateBitCast(argAddr, CGF.Int8PtrTy);
   args.add(RValue::get(argAddr), CGF.getContext().VoidPtrTy);
 
   // Third argument is the helper function.
   args.add(RValue::get(AtomicHelperFn), CGF.getContext().VoidPtrTy);
 
-  llvm::Constant *fn =
+  llvm::FunctionCallee fn =
       CGF.CGM.getObjCRuntime().GetCppAtomicObjectSetFunction();
   CGCallee callee = CGCallee::forDirect(fn);
   CGF.EmitCall(
       CGF.getTypes().arrangeBuiltinFunctionCall(CGF.getContext().VoidTy, args),
                callee, ReturnValueSlot(), args);
 }
 
 
 static bool hasTrivialSetExpr(const ObjCPropertyImplDecl *PID) {
case PropertyImplStrategy::Native: {
     llvm::StoreInst *store = Builder.CreateStore(load, ivarAddr);
     store->setAtomic(llvm::AtomicOrdering::Unordered);
     return;
   }
 
   case PropertyImplStrategy::GetSetProperty:
   case PropertyImplStrategy::SetPropertyAndExpressionGet: {
 
-    llvm::Constant *setOptimizedPropertyFn = nullptr;
-    llvm::Constant *setPropertyFn = nullptr;
+    llvm::FunctionCallee setOptimizedPropertyFn = nullptr;
+    llvm::FunctionCallee setPropertyFn = nullptr;
     if (UseOptimizedSetter(CGM)) {
       // 10.8 and iOS 6.0 code and GC is off
       setOptimizedPropertyFn =
-        CGM.getObjCRuntime()
-           .GetOptimizedPropertySetFunction(strategy.isAtomic(),
-                                            strategy.isCopy());
+          CGM.getObjCRuntime().GetOptimizedPropertySetFunction(
+              strategy.isAtomic(), strategy.isCopy());
       if (!setOptimizedPropertyFn) {
         CGM.ErrorUnsupported(propImpl, "Obj-C optimized setter - NYI");
         return;
       }
     }
     else {
       setPropertyFn = CGM.getObjCRuntime().GetPropertySetFunction();
       if (!setPropertyFn) {
QualType CodeGenFunction::TypeOfSelfObject() {
   const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
   ImplicitParamDecl *selfDecl = OMD->getSelfDecl();
   const ObjCObjectPointerType *PTy = cast<ObjCObjectPointerType>(
     getContext().getCanonicalType(selfDecl->getType()));
   return PTy->getPointeeType();
 }
 
 void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){
-  llvm::Constant *EnumerationMutationFnPtr =
+  llvm::FunctionCallee EnumerationMutationFnPtr =
       CGM.getObjCRuntime().EnumerationMutationFunction();
   if (!EnumerationMutationFnPtr) {
     CGM.ErrorUnsupported(&S, "Obj-C fast enumeration for this runtime");
     return;
   }
   CGCallee EnumerationMutationFn =
     CGCallee::forDirect(EnumerationMutationFnPtr);
 
   CGDebugInfo *DI = getDebugInfo();

 llvm::Value *CodeGenFunction::EmitObjCExtendObjectLifetime(QualType type,
                                                            llvm::Value *value) {
   return EmitARCRetainAutorelease(type, value);
 }
 
 /// Given a number of pointers, inform the optimizer that they're
 /// being intrinsically used up until this point in the program.
 void CodeGenFunction::EmitARCIntrinsicUse(ArrayRef<llvm::Value*> values) {
-  llvm::Constant *&fn = CGM.getObjCEntrypoints().clang_arc_use;
+  llvm::Function *&fn = CGM.getObjCEntrypoints().clang_arc_use;
   if (!fn)
     fn = CGM.getIntrinsic(llvm::Intrinsic::objc_clang_arc_use);
 
   // This isn't really a "runtime" function, but as an intrinsic it
   // doesn't really matter as long as we align things up.
   EmitNounwindRuntimeCall(fn, values);
 }
 
-static void setARCRuntimeFunctionLinkage(CodeGenModule &CGM,
-                                         llvm::Constant *RTF) {
+static void setARCRuntimeFunctionLinkage(CodeGenModule &CGM, llvm::Value *RTF) {
   if (auto *F = dyn_cast<llvm::Function>(RTF)) {
     // If the target runtime doesn't naturally support ARC, emit weak
     // references to the runtime support library.  We don't really
     // permit this to fail, but we need a particular relocation style.
     if (!CGM.getLangOpts().ObjCRuntime.hasNativeARC() &&
         !CGM.getTriple().isOSBinFormatCOFF()) {
       F->setLinkage(llvm::Function::ExternalWeakLinkage);
     }
   }
 }
 
+static void setARCRuntimeFunctionLinkage(CodeGenModule &CGM,
+                                         llvm::FunctionCallee RTF) {
+  setARCRuntimeFunctionLinkage(CGM, RTF.getCallee());
+}
+
 /// Perform an operation having the signature
 ///   i8* (i8*)
 /// where a null input causes a no-op and returns null.
-static llvm::Value *emitARCValueOperation(CodeGenFunction &CGF,
-                                          llvm::Value *value,
-                                          llvm::Type *returnType,
-                                          llvm::Constant *&fn,
-                                          llvm::Intrinsic::ID IntID,
-                                          bool isTailCall = false) {
+static llvm::Value *
+emitARCValueOperation(CodeGenFunction &CGF, llvm::Value *value,
+                      llvm::Type *returnType, llvm::Function *&fn,
+                      llvm::Intrinsic::ID IntID, bool isTailCall = false) {
   if (isa<llvm::ConstantPointerNull>(value))
     return value;
 
   if (!fn) {
     fn = CGF.CGM.getIntrinsic(IntID);
     setARCRuntimeFunctionLinkage(CGF.CGM, fn);
   }
 
   // Cast the argument to 'id'.
   llvm::Type *origType = returnType ? returnType : value->getType();
   value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
 
   // Call the function.
   llvm::CallInst *call = CGF.EmitNounwindRuntimeCall(fn, value);
   if (isTailCall)
     call->setTailCall();
 
   // Cast the result back to the original type.
   return CGF.Builder.CreateBitCast(call, origType);
 }
 
 /// Perform an operation having the following signature:
 ///   i8* (i8**)
-static llvm::Value *emitARCLoadOperation(CodeGenFunction &CGF,
-                                         Address addr,
-                                         llvm::Constant *&fn,
+static llvm::Value *emitARCLoadOperation(CodeGenFunction &CGF, Address addr,
+                                         llvm::Function *&fn,
                                          llvm::Intrinsic::ID IntID) {
   if (!fn) {
     fn = CGF.CGM.getIntrinsic(IntID);
     setARCRuntimeFunctionLinkage(CGF.CGM, fn);
   }
 
   // Cast the argument to 'id*'.
   llvm::Type *origType = addr.getElementType();
   addr = CGF.Builder.CreateBitCast(addr, CGF.Int8PtrPtrTy);
 
   // Call the function.
   llvm::Value *result = CGF.EmitNounwindRuntimeCall(fn, addr.getPointer());
 
   // Cast the result back to a dereference of the original type.
   if (origType != CGF.Int8PtrTy)
     result = CGF.Builder.CreateBitCast(result, origType);
 
   return result;
 }
 
 /// Perform an operation having the following signature:
 ///   i8* (i8**, i8*)
-static llvm::Value *emitARCStoreOperation(CodeGenFunction &CGF,
-                                          Address addr,
+static llvm::Value *emitARCStoreOperation(CodeGenFunction &CGF, Address addr,
                                           llvm::Value *value,
-                                          llvm::Constant *&fn,
+                                          llvm::Function *&fn,
                                           llvm::Intrinsic::ID IntID,
                                           bool ignored) {
   assert(addr.getElementType() == value->getType());
 
   if (!fn) {
     fn = CGF.CGM.getIntrinsic(IntID);
     setARCRuntimeFunctionLinkage(CGF.CGM, fn);
   }
 
   llvm::Type *origType = value->getType();
 
   llvm::Value *args[] = {
     CGF.Builder.CreateBitCast(addr.getPointer(), CGF.Int8PtrPtrTy),
     CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy)
   };
   llvm::CallInst *result = CGF.EmitNounwindRuntimeCall(fn, args);
 
   if (ignored) return nullptr;
 
   return CGF.Builder.CreateBitCast(result, origType);
 }
 
 /// Perform an operation having the following signature:
 ///   void (i8**, i8**)
-static void emitARCCopyOperation(CodeGenFunction &CGF,
-                                 Address dst,
-                                 Address src,
-                                 llvm::Constant *&fn,
+static void emitARCCopyOperation(CodeGenFunction &CGF, Address dst, Address src,
+                                 llvm::Function *&fn,
                                  llvm::Intrinsic::ID IntID) {
   assert(dst.getType() == src.getType());
 
   if (!fn) {
     fn = CGF.CGM.getIntrinsic(IntID);
     setARCRuntimeFunctionLinkage(CGF.CGM, fn);
   }
 
   llvm::Value *args[] = {
     CGF.Builder.CreateBitCast(dst.getPointer(), CGF.Int8PtrPtrTy),
     CGF.Builder.CreateBitCast(src.getPointer(), CGF.Int8PtrPtrTy)
   };
   CGF.EmitNounwindRuntimeCall(fn, args);
 }
 
 /// Perform an operation having the signature
 ///   i8* (i8*)
 /// where a null input causes a no-op and returns null.
 static llvm::Value *emitObjCValueOperation(CodeGenFunction &CGF,
                                            llvm::Value *value,
                                            llvm::Type *returnType,
-                                           llvm::Constant *&fn,
-                                           StringRef fnName,
-                                           bool MayThrow) {
+                                           llvm::FunctionCallee &fn,
+                                           StringRef fnName, bool MayThrow) {
   if (isa<llvm::ConstantPointerNull>(value))
     return value;
 
   if (!fn) {
     llvm::FunctionType *fnType =
       llvm::FunctionType::get(CGF.Int8PtrTy, CGF.Int8PtrTy, false);
     fn = CGF.CGM.CreateRuntimeFunction(fnType, fnName);
 
     // We have Native ARC, so set nonlazybind attribute for performance
-    if (llvm::Function *f = dyn_cast<llvm::Function>(fn))
+    if (llvm::Function *f = dyn_cast<llvm::Function>(fn.getCallee()))
       if (fnName == "objc_retain")
         f->addFnAttr(llvm::Attribute::NonLazyBind);
   }
 
   // Cast the argument to 'id'.
   llvm::Type *origType = returnType ? returnType : value->getType();
   value = CGF.Builder.CreateBitCast(value, CGF.Int8PtrTy);
 

 }
 
 /// Release the given object.
 ///   call void \@objc_release(i8* %value)
 void CodeGenFunction::EmitARCRelease(llvm::Value *value,
                                      ARCPreciseLifetime_t precise) {
   if (isa<llvm::ConstantPointerNull>(value)) return;
 
-  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_release;
+  llvm::Function *&fn = CGM.getObjCEntrypoints().objc_release;
   if (!fn) {
     fn = CGM.getIntrinsic(llvm::Intrinsic::objc_release);
     setARCRuntimeFunctionLinkage(CGM, fn);
   }
 
   // Cast the argument to 'id'.
   value = Builder.CreateBitCast(value, Int8PtrTy);
 

 
 /// Store into a strong object.  Always calls this:
 ///   call void \@objc_storeStrong(i8** %addr, i8* %value)
 llvm::Value *CodeGenFunction::EmitARCStoreStrongCall(Address addr,
                                                      llvm::Value *value,
                                                      bool ignored) {
   assert(addr.getElementType() == value->getType());
 
-  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_storeStrong;
+  llvm::Function *&fn = CGM.getObjCEntrypoints().objc_storeStrong;
   if (!fn) {
     fn = CGM.getIntrinsic(llvm::Intrinsic::objc_storeStrong);
     setARCRuntimeFunctionLinkage(CGM, fn);
   }
 
   llvm::Value *args[] = {
     Builder.CreateBitCast(addr.getPointer(), Int8PtrPtrTy),
     Builder.CreateBitCast(value, Int8PtrTy)
void CodeGenFunction::EmitARCInitWeak(Address addr, llvm::Value *value) {
   emitARCStoreOperation(*this, addr, value,
                         CGM.getObjCEntrypoints().objc_initWeak,
                         llvm::Intrinsic::objc_initWeak, /*ignored*/ true);
 }
 
 /// void \@objc_destroyWeak(i8** %addr)
 /// Essentially objc_storeWeak(addr, nil).
 void CodeGenFunction::EmitARCDestroyWeak(Address addr) {
-  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_destroyWeak;
+  llvm::Function *&fn = CGM.getObjCEntrypoints().objc_destroyWeak;
   if (!fn) {
     fn = CGM.getIntrinsic(llvm::Intrinsic::objc_destroyWeak);
     setARCRuntimeFunctionLinkage(CGM, fn);
   }
 
   // Cast the argument to 'id*'.
   addr = Builder.CreateBitCast(addr, Int8PtrPtrTy);
 
void CodeGenFunction::emitARCMoveAssignWeak(QualType Ty, Address DstAddr,
   Object = EmitObjCConsumeObject(Ty, Object);
   EmitARCStoreWeak(DstAddr, Object, false);
   EmitARCDestroyWeak(SrcAddr);
 }
 
 /// Produce the code to do a objc_autoreleasepool_push.
 ///   call i8* \@objc_autoreleasePoolPush(void)
 llvm::Value *CodeGenFunction::EmitObjCAutoreleasePoolPush() {
-  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPush;
+  llvm::Function *&fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPush;
   if (!fn) {
     fn = CGM.getIntrinsic(llvm::Intrinsic::objc_autoreleasePoolPush);
     setARCRuntimeFunctionLinkage(CGM, fn);
   }
 
   return EmitNounwindRuntimeCall(fn);
 }
 
 /// Produce the code to do a primitive release.
 ///   call void \@objc_autoreleasePoolPop(i8* %ptr)
 void CodeGenFunction::EmitObjCAutoreleasePoolPop(llvm::Value *value) {
   assert(value->getType() == Int8PtrTy);
 
   if (getInvokeDest()) {
     // Call the runtime method not the intrinsic if we are handling exceptions
-    llvm::Constant *&fn =
+    llvm::FunctionCallee &fn =
         CGM.getObjCEntrypoints().objc_autoreleasePoolPopInvoke;
     if (!fn) {
       llvm::FunctionType *fnType =
         llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
       fn = CGM.CreateRuntimeFunction(fnType, "objc_autoreleasePoolPop");
       setARCRuntimeFunctionLinkage(CGM, fn);
     }
 
     // objc_autoreleasePoolPop can throw.
     EmitRuntimeCallOrInvoke(fn, value);
   } else {
-    llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPop;
+    llvm::FunctionCallee &fn = CGM.getObjCEntrypoints().objc_autoreleasePoolPop;
     if (!fn) {
       fn = CGM.getIntrinsic(llvm::Intrinsic::objc_autoreleasePoolPop);
       setARCRuntimeFunctionLinkage(CGM, fn);
     }
 
     EmitRuntimeCall(fn, value);
   }
 }

 }
 
 /// Release the given object.
 ///   call void \@objc_release(i8* %value)
 void CodeGenFunction::EmitObjCRelease(llvm::Value *value,
                                       ARCPreciseLifetime_t precise) {
   if (isa<llvm::ConstantPointerNull>(value)) return;
 
-  llvm::Constant *&fn = CGM.getObjCEntrypoints().objc_release;
-  if (!fn) {
-    if (!fn) {
-      llvm::FunctionType *fnType =
+  llvm::FunctionCallee &fn =
+      CGM.getObjCEntrypoints().objc_releaseRuntimeFunction;
         llvm::FunctionType::get(Builder.getVoidTy(), Int8PtrTy, false);
-      fn = CGM.CreateRuntimeFunction(fnType, "objc_release");
-      setARCRuntimeFunctionLinkage(CGM, fn);
-      // We have Native ARC, so set nonlazybind attribute for performance
-      if (llvm::Function *f = dyn_cast<llvm::Function>(fn))
-        f->addFnAttr(llvm::Attribute::NonLazyBind);
-    }
-  }
+    if (llvm::Function *f = dyn_cast<llvm::Function>(fn.getCallee()))
 
   // Cast the argument to 'id'.
   value = Builder.CreateBitCast(value, Int8PtrTy);
 
   // Call objc_release.
   llvm::CallInst *call = EmitNounwindRuntimeCall(fn, value);
 
   if (precise == ARCImpreciseLifetime) {

 }
 
 /// EmitExtendGCLifetime - Given a pointer to an Objective-C object,
 /// make sure it survives garbage collection until this point.
 void CodeGenFunction::EmitExtendGCLifetime(llvm::Value *object) {
   // We just use an inline assembly.
   llvm::FunctionType *extenderType
     = llvm::FunctionType::get(VoidTy, VoidPtrTy, RequiredArgs::All);
-  llvm::Value *extender
-    = llvm::InlineAsm::get(extenderType,
+  llvm::InlineAsm *extender = llvm::InlineAsm::get(extenderType,
                                                    /* assembly */ "",
                                                    /* constraints */ "r",
                                                    /* side effects */ true);
 
   object = Builder.CreateBitCast(object, VoidPtrTy);
   EmitNounwindRuntimeCall(extender, object);
 }
 
 /// GenerateObjCAtomicSetterCopyHelperFunction - Given a c++ object type with
 /// non-trivial copy assignment function, produce following helper function.
 /// static void copyHelper(Ty *dest, const Ty *source) { *dest = *source; }
void CodeGenModule::emitAtAvailableLinkGuard() {
   auto &Context = getLLVMContext();
   llvm::Metadata *Args[2] = {llvm::MDString::get(Context, "-framework"),
                              llvm::MDString::get(Context, "CoreFoundation")};
   LinkerOptionsMetadata.push_back(llvm::MDNode::get(Context, Args));
   // Emit a reference to a symbol from CoreFoundation to ensure that
   // CoreFoundation is linked into the final binary.
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(Int32Ty, {VoidPtrTy}, false);
-  llvm::Constant *CFFunc =
+  llvm::FunctionCallee CFFunc =
       CreateRuntimeFunction(FTy, "CFBundleGetVersionNumber");
 
   llvm::FunctionType *CheckFTy = llvm::FunctionType::get(VoidTy, {}, false);
-  llvm::Function *CFLinkCheckFunc = cast<llvm::Function>(CreateBuiltinFunction(
-      CheckFTy, "__clang_at_available_requires_core_foundation_framework"));
+  llvm::FunctionCallee CFLinkCheckFuncRef = CreateRuntimeFunction(
+      CheckFTy, "__clang_at_available_requires_core_foundation_framework",
+      llvm::AttributeList(), /*IsLocal=*/true);
+  llvm::Function *CFLinkCheckFunc =
+      cast<llvm::Function>(CFLinkCheckFuncRef.getCallee()->stripPointerCasts());
+  if (CFLinkCheckFunc->empty()) {
     CFLinkCheckFunc->setLinkage(llvm::GlobalValue::LinkOnceAnyLinkage);
     CFLinkCheckFunc->setVisibility(llvm::GlobalValue::HiddenVisibility);
     CodeGenFunction CGF(*this);
     CGF.Builder.SetInsertPoint(CGF.createBasicBlock("", CFLinkCheckFunc));
-  CGF.EmitNounwindRuntimeCall(CFFunc, llvm::Constant::getNullValue(VoidPtrTy));
+    CGF.EmitNounwindRuntimeCall(CFFunc,
+                                llvm::Constant::getNullValue(VoidPtrTy));
     CGF.Builder.CreateUnreachable();
     addCompilerUsedGlobal(CFLinkCheckFunc);
   }
+}
 
 CGObjCRuntime::~CGObjCRuntime() {}

lib/CodeGen/CGObjCGNU.cpp

 
 /// Class that lazily initialises the runtime function.  Avoids inserting the
 /// types and the function declaration into a module if they're not used, and
 /// avoids constructing the type more than once if it's used more than once.
 class LazyRuntimeFunction {
   CodeGenModule *CGM;
   llvm::FunctionType *FTy;
   const char *FunctionName;
-  llvm::Constant *Function;
+  llvm::FunctionCallee Function;
 
 public:
   /// Constructor leaves this class uninitialized, because it is intended to
   /// be used as a field in another class and not all of the types that are
   /// used as arguments will necessarily be available at construction time.
   LazyRuntimeFunction()
       : CGM(nullptr), FunctionName(nullptr), Function(nullptr) {}
 
else {
       FTy = llvm::FunctionType::get(RetTy, None, false);
     }
   }
 
   llvm::FunctionType *getType() { return FTy; }
 
   /// Overloaded cast operator, allows the class to be implicitly cast to an
   /// LLVM constant.
-  operator llvm::Constant *() {
+  operator llvm::FunctionCallee() {
     if (!Function) {
       if (!FunctionName)
         return nullptr;
       Function = CGM->CreateRuntimeFunction(FTy, FunctionName);
     }
     return Function;
   }
-  operator llvm::Function *() {
-    return cast<llvm::Function>((llvm::Constant *)*this);
-  }
 };
 
 
 /// GNU Objective-C runtime code generation.  This class implements the parts of
 /// Objective-C support that are specific to the GNU family of runtimes (GCC,
 /// GNUstep and ObjFW).
 class CGObjCGNU : public CGObjCRuntime {
 protected:
llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
                                  const ObjCContainerDecl *CD) override;
   void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
   void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
   void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override;
   llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
                                    const ObjCProtocolDecl *PD) override;
   void GenerateProtocol(const ObjCProtocolDecl *PD) override;
   llvm::Function *ModuleInitFunction() override;
-  llvm::Constant *GetPropertyGetFunction() override;
-  llvm::Constant *GetPropertySetFunction() override;
-  llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
+  llvm::FunctionCallee GetPropertyGetFunction() override;
+  llvm::FunctionCallee GetPropertySetFunction() override;
+  llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
                                                        bool copy) override;
-  llvm::Constant *GetSetStructFunction() override;
-  llvm::Constant *GetGetStructFunction() override;
-  llvm::Constant *GetCppAtomicObjectGetFunction() override;
-  llvm::Constant *GetCppAtomicObjectSetFunction() override;
-  llvm::Constant *EnumerationMutationFunction() override;
+  llvm::FunctionCallee GetSetStructFunction() override;
+  llvm::FunctionCallee GetGetStructFunction() override;
+  llvm::FunctionCallee GetCppAtomicObjectGetFunction() override;
+  llvm::FunctionCallee GetCppAtomicObjectSetFunction() override;
+  llvm::FunctionCallee EnumerationMutationFunction() override;
 
   void EmitTryStmt(CodeGenFunction &CGF,
                    const ObjCAtTryStmt &S) override;
   void EmitSynchronizedStmt(CodeGenFunction &CGF,
                             const ObjCAtSynchronizedStmt &S) override;
   void EmitThrowStmt(CodeGenFunction &CGF,
                      const ObjCAtThrowStmt &S,
                      bool ClearInsertionPoint=true) override;
class CGObjCGNUstep : public CGObjCGNU {
   public:
     llvm::Constant *GetEHType(QualType T) override;
 
   protected:
     llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
                            llvm::Value *cmd, llvm::MDNode *node,
                            MessageSendInfo &MSI) override {
       CGBuilderTy &Builder = CGF.Builder;
-      llvm::Function *LookupFn = SlotLookupFn;
+      llvm::FunctionCallee LookupFn = SlotLookupFn;
 
       // Store the receiver on the stack so that we can reload it later
       Address ReceiverPtr =
         CGF.CreateTempAlloca(Receiver->getType(), CGF.getPointerAlign());
       Builder.CreateStore(Receiver, ReceiverPtr);
 
       llvm::Value *self;
 
       if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)) {
         self = CGF.LoadObjCSelf();
       } else {
         self = llvm::ConstantPointerNull::get(IdTy);
       }
 
       // The lookup function is guaranteed not to capture the receiver pointer.
-      LookupFn->addParamAttr(0, llvm::Attribute::NoCapture);
+      if (auto *LookupFn2 = dyn_cast<llvm::Function>(LookupFn.getCallee()))
+        LookupFn2->addParamAttr(0, llvm::Attribute::NoCapture);
 
       llvm::Value *args[] = {
               EnforceType(Builder, ReceiverPtr.getPointer(), PtrToIdTy),
               EnforceType(Builder, cmd, SelectorTy),
               EnforceType(Builder, self, IdTy) };
       llvm::CallBase *slot = CGF.EmitRuntimeCallOrInvoke(LookupFn, args);
       slot->setOnlyReadsMemory();
       slot->setMetadata(msgSendMDKind, node);
CGObjCGNUstep(CodeGenModule &Mod, unsigned ABI, unsigned ProtocolABI,
       CxxAtomicObjectSetFn.init(&CGM, "objc_setCppObjectAtomic", VoidTy, PtrTy,
                                 PtrTy, PtrTy);
       // void objc_getCppObjectAtomic(void *dest, const void *src, void
       // *helper);
       CxxAtomicObjectGetFn.init(&CGM, "objc_getCppObjectAtomic", VoidTy, PtrTy,
                                 PtrTy, PtrTy);
     }
 
-    llvm::Constant *GetCppAtomicObjectGetFunction() override {
+    llvm::FunctionCallee GetCppAtomicObjectGetFunction() override {
       // The optimised functions were added in version 1.7 of the GNUstep
       // runtime.
       assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
           VersionTuple(1, 7));
       return CxxAtomicObjectGetFn;
     }
 
-    llvm::Constant *GetCppAtomicObjectSetFunction() override {
+    llvm::FunctionCallee GetCppAtomicObjectSetFunction() override {
       // The optimised functions were added in version 1.7 of the GNUstep
       // runtime.
       assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
           VersionTuple(1, 7));
       return CxxAtomicObjectSetFn;
     }
 
-    llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
+    llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
                                                          bool copy) override {
       // The optimised property functions omit the GC check, and so are not
       // safe to use in GC mode.  The standard functions are fast in GC mode,
       // so there is less advantage in using them.
       assert ((CGM.getLangOpts().getGC() == LangOptions::NonGC));
       // The optimised functions were added in version 1.7 of the GNUstep
       // runtime.
       assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
           VersionTuple(1, 7));
class CGObjCGNUstep2 : public CGObjCGNUstep {
   }
   void CallRuntimeFunction(CGBuilderTy &B, StringRef FunctionName,
       ArrayRef<llvm::Value*> Args) {
     SmallVector<llvm::Type *,8> Types;
     for (auto *Arg : Args)
       Types.push_back(Arg->getType());
     llvm::FunctionType *FT = llvm::FunctionType::get(B.getVoidTy(), Types,
         false);
-    llvm::Value *Fn = CGM.CreateRuntimeFunction(FT, FunctionName);
+    llvm::FunctionCallee Fn = CGM.CreateRuntimeFunction(FT, FunctionName);
     B.CreateCall(Fn, Args);
   }
 
   ConstantAddress GenerateConstantString(const StringLiteral *SL) override {
 
     auto Str = SL->getString();
     CharUnits Align = CGM.getPointerAlign();
 
llvm::Value *CGObjCGNU::GetClassNamed(CodeGenFunction &CGF,
   // still performing this lookup at run time but emitting the symbol for the
   // class externally so that we can make the switch later.
   //
   // Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class
   // with memoized versions or with static references if it's safe to do so.
   if (!isWeak)
     EmitClassRef(Name);
 
-  llvm::Constant *ClassLookupFn =
-    CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, PtrToInt8Ty, true),
-                              "objc_lookup_class");
+  llvm::FunctionCallee ClassLookupFn = CGM.CreateRuntimeFunction(
+      llvm::FunctionType::get(IdTy, PtrToInt8Ty, true), "objc_lookup_class");
   return CGF.EmitNounwindRuntimeCall(ClassLookupFn, ClassName);
 }
 
 // This has to perform the lookup every time, since posing and related
 // techniques can modify the name -> class mapping.
 llvm::Value *CGObjCGNU::GetClass(CodeGenFunction &CGF,
                                  const ObjCInterfaceDecl *OID) {
   auto *Value =
if (IsClassMessage)  {
       ReceiverClass = Builder.CreateBitCast(ReceiverClass,
                                             llvm::PointerType::getUnqual(IdTy));
       ReceiverClass =
         Builder.CreateAlignedLoad(ReceiverClass, CGF.getPointerAlign());
     }
     ReceiverClass = EnforceType(Builder, ReceiverClass, IdTy);
   } else {
     if (isCategoryImpl) {
-      llvm::Constant *classLookupFunction = nullptr;
+      llvm::FunctionCallee classLookupFunction = nullptr;
       if (IsClassMessage)  {
         classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
               IdTy, PtrTy, true), "objc_get_meta_class");
       } else {
         classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
               IdTy, PtrTy, true), "objc_get_class");
       }
       ReceiverClass = Builder.CreateCall(classLookupFunction,
CGObjCGNU::GenerateMessageSend(CodeGenFunction &CGF,
   // given platform), so we
   switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) {
     case CodeGenOptions::Legacy:
       imp = LookupIMP(CGF, Receiver, cmd, node, MSI);
       break;
     case CodeGenOptions::Mixed:
     case CodeGenOptions::NonLegacy:
       if (CGM.ReturnTypeUsesFPRet(ResultType)) {
-        imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
-                                  "objc_msgSend_fpret");
+        imp =
+            CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
+                                      "objc_msgSend_fpret")
+                .getCallee();
       } else if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) {
         // The actual types here don't matter - we're going to bitcast the
         // function anyway
-        imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
-                                  "objc_msgSend_stret");
+        imp =
+            CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
+                                      "objc_msgSend_stret")
+                .getCallee();
       } else {
-        imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
-                                  "objc_msgSend");
+        imp = CGM.CreateRuntimeFunction(
+                     llvm::FunctionType::get(IdTy, IdTy, true), "objc_msgSend")
+                  .getCallee();
       }
   }
 
   // Reset the receiver in case the lookup modified it
   ActualArgs[0] = CallArg(RValue::get(Receiver), ASTIdTy);
 
   imp = EnforceType(Builder, imp, MSI.MessengerType);
 
llvm::Function * LoadFunction = llvm::Function::Create(
       &TheModule);
   llvm::BasicBlock *EntryBB =
       llvm::BasicBlock::Create(VMContext, "entry", LoadFunction);
   CGBuilderTy Builder(CGM, VMContext);
   Builder.SetInsertPoint(EntryBB);
 
   llvm::FunctionType *FT =
     llvm::FunctionType::get(Builder.getVoidTy(), module->getType(), true);
-  llvm::Value *Register = CGM.CreateRuntimeFunction(FT, "__objc_exec_class");
+  llvm::FunctionCallee Register =
+      CGM.CreateRuntimeFunction(FT, "__objc_exec_class");
   Builder.CreateCall(Register, module);
 
   if (!ClassAliases.empty()) {
     llvm::Type *ArgTypes[2] = {PtrTy, PtrToInt8Ty};
     llvm::FunctionType *RegisterAliasTy =
       llvm::FunctionType::get(Builder.getVoidTy(),
                               ArgTypes, false);
     llvm::Function *RegisterAlias = llvm::Function::Create(
llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD,
   llvm::Function *Method
     = llvm::Function::Create(MethodTy,
                              llvm::GlobalValue::InternalLinkage,
                              FunctionName,
                              &TheModule);
   return Method;
 }
 
-llvm::Constant *CGObjCGNU::GetPropertyGetFunction() {
+llvm::FunctionCallee CGObjCGNU::GetPropertyGetFunction() {
   return GetPropertyFn;
 }
 
-llvm::Constant *CGObjCGNU::GetPropertySetFunction() {
+llvm::FunctionCallee CGObjCGNU::GetPropertySetFunction() {
   return SetPropertyFn;
 }
 
-llvm::Constant *CGObjCGNU::GetOptimizedPropertySetFunction(bool atomic,
+llvm::FunctionCallee CGObjCGNU::GetOptimizedPropertySetFunction(bool atomic,
                                                                 bool copy) {
   return nullptr;
 }
 
-llvm::Constant *CGObjCGNU::GetGetStructFunction() {
+llvm::FunctionCallee CGObjCGNU::GetGetStructFunction() {
   return GetStructPropertyFn;
 }
 
-llvm::Constant *CGObjCGNU::GetSetStructFunction() {
+llvm::FunctionCallee CGObjCGNU::GetSetStructFunction() {
   return SetStructPropertyFn;
 }
 
-llvm::Constant *CGObjCGNU::GetCppAtomicObjectGetFunction() {
+llvm::FunctionCallee CGObjCGNU::GetCppAtomicObjectGetFunction() {
   return nullptr;
 }
 
-llvm::Constant *CGObjCGNU::GetCppAtomicObjectSetFunction() {
+llvm::FunctionCallee CGObjCGNU::GetCppAtomicObjectSetFunction() {
   return nullptr;
 }
 
-llvm::Constant *CGObjCGNU::EnumerationMutationFunction() {
+llvm::FunctionCallee CGObjCGNU::EnumerationMutationFunction() {
   return EnumerationMutationFn;
 }
 
 void CGObjCGNU::EmitSynchronizedStmt(CodeGenFunction &CGF,
                                      const ObjCAtSynchronizedStmt &S) {
   EmitAtSynchronizedStmt(CGF, S, SyncEnterFn, SyncExitFn);
 }
 
void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF,
   if (ClearInsertionPoint)
     CGF.Builder.ClearInsertionPoint();
 }
 
 llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF,
                                           Address AddrWeakObj) {
   CGBuilderTy &B = CGF.Builder;
   AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy);
-  return B.CreateCall(WeakReadFn.getType(), WeakReadFn,
-                      AddrWeakObj.getPointer());
+  return B.CreateCall(WeakReadFn, AddrWeakObj.getPointer());
 }
 
 void CGObjCGNU::EmitObjCWeakAssign(CodeGenFunction &CGF,
                                    llvm::Value *src, Address dst) {
   CGBuilderTy &B = CGF.Builder;
   src = EnforceType(B, src, IdTy);
   dst = EnforceType(B, dst, PtrToIdTy);
-  B.CreateCall(WeakAssignFn.getType(), WeakAssignFn,
-               {src, dst.getPointer()});
+  B.CreateCall(WeakAssignFn, {src, dst.getPointer()});
 }
 
 void CGObjCGNU::EmitObjCGlobalAssign(CodeGenFunction &CGF,
                                      llvm::Value *src, Address dst,
                                      bool threadlocal) {
   CGBuilderTy &B = CGF.Builder;
   src = EnforceType(B, src, IdTy);
   dst = EnforceType(B, dst, PtrToIdTy);
   // FIXME. Add threadloca assign API
   assert(!threadlocal && "EmitObjCGlobalAssign - Threal Local API NYI");
-  B.CreateCall(GlobalAssignFn.getType(), GlobalAssignFn,
-               {src, dst.getPointer()});
+  B.CreateCall(GlobalAssignFn, {src, dst.getPointer()});
 }
 
 void CGObjCGNU::EmitObjCIvarAssign(CodeGenFunction &CGF,
                                    llvm::Value *src, Address dst,
                                    llvm::Value *ivarOffset) {
   CGBuilderTy &B = CGF.Builder;
   src = EnforceType(B, src, IdTy);
   dst = EnforceType(B, dst, IdTy);
-  B.CreateCall(IvarAssignFn.getType(), IvarAssignFn,
-               {src, dst.getPointer(), ivarOffset});
+  B.CreateCall(IvarAssignFn, {src, dst.getPointer(), ivarOffset});
 }
 
 void CGObjCGNU::EmitObjCStrongCastAssign(CodeGenFunction &CGF,
                                          llvm::Value *src, Address dst) {
   CGBuilderTy &B = CGF.Builder;
   src = EnforceType(B, src, IdTy);
   dst = EnforceType(B, dst, PtrToIdTy);
-  B.CreateCall(StrongCastAssignFn.getType(), StrongCastAssignFn,
-               {src, dst.getPointer()});
+  B.CreateCall(StrongCastAssignFn, {src, dst.getPointer()});
 }
 
 void CGObjCGNU::EmitGCMemmoveCollectable(CodeGenFunction &CGF,
                                          Address DestPtr,
                                          Address SrcPtr,
                                          llvm::Value *Size) {
   CGBuilderTy &B = CGF.Builder;
   DestPtr = EnforceType(B, DestPtr, PtrTy);
   SrcPtr = EnforceType(B, SrcPtr, PtrTy);
 
-  B.CreateCall(MemMoveFn.getType(), MemMoveFn,
-               {DestPtr.getPointer(), SrcPtr.getPointer(), Size});
+  B.CreateCall(MemMoveFn, {DestPtr.getPointer(), SrcPtr.getPointer(), Size});
 }
 
 llvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable(
                               const ObjCInterfaceDecl *ID,
                               const ObjCIvarDecl *Ivar) {
   const std::string Name = GetIVarOffsetVariableName(ID, Ivar);
   // Emit the variable and initialize it with what we think the correct value
   // is.  This allows code compiled with non-fragile ivars to work correctly

lib/CodeGen/CGObjCMac.cpp

 private:
   // The types of these functions don't really matter because we
   // should always bitcast before calling them.
 
   /// id objc_msgSend (id, SEL, ...)
   ///
   /// The default messenger, used for sends whose ABI is unchanged from
   /// the all-integer/pointer case.
-  llvm::Constant *getMessageSendFn() const {
+  llvm::FunctionCallee getMessageSendFn() const {
     // Add the non-lazy-bind attribute, since objc_msgSend is likely to
     // be called a lot.
     llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
     return CGM.CreateRuntimeFunction(
         llvm::FunctionType::get(ObjectPtrTy, params, true), "objc_msgSend",
         llvm::AttributeList::get(CGM.getLLVMContext(),
                                  llvm::AttributeList::FunctionIndex,
                                  llvm::Attribute::NonLazyBind));
   }
 
   /// void objc_msgSend_stret (id, SEL, ...)
   ///
   /// The messenger used when the return value is an aggregate returned
   /// by indirect reference in the first argument, and therefore the
   /// self and selector parameters are shifted over by one.
-  llvm::Constant *getMessageSendStretFn() const {
+  llvm::FunctionCallee getMessageSendStretFn() const {
     llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.VoidTy,
                                                              params, true),
                                      "objc_msgSend_stret");
-
   }
 
   /// [double | long double] objc_msgSend_fpret(id self, SEL op, ...)
   ///
   /// The messenger used when the return value is returned on the x87
   /// floating-point stack; without a special entrypoint, the nil case
   /// would be unbalanced.
-  llvm::Constant *getMessageSendFpretFn() const {
+  llvm::FunctionCallee getMessageSendFpretFn() const {
     llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.DoubleTy,
                                                              params, true),
                                      "objc_msgSend_fpret");
-
   }
 
   /// _Complex long double objc_msgSend_fp2ret(id self, SEL op, ...)
   ///
   /// The messenger used when the return value is returned in two values on the
   /// x87 floating point stack; without a special entrypoint, the nil case
   /// would be unbalanced. Only used on 64-bit X86.
-  llvm::Constant *getMessageSendFp2retFn() const {
+  llvm::FunctionCallee getMessageSendFp2retFn() const {
     llvm::Type *params[] = { ObjectPtrTy, SelectorPtrTy };
     llvm::Type *longDoubleType = llvm::Type::getX86_FP80Ty(VMContext);
     llvm::Type *resultType =
         llvm::StructType::get(longDoubleType, longDoubleType);
 
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(resultType,
                                                              params, true),
                                      "objc_msgSend_fp2ret");
   }
 
   /// id objc_msgSendSuper(struct objc_super *super, SEL op, ...)
   ///
   /// The messenger used for super calls, which have different dispatch
   /// semantics.  The class passed is the superclass of the current
   /// class.
-  llvm::Constant *getMessageSendSuperFn() const {
+  llvm::FunctionCallee getMessageSendSuperFn() const {
     llvm::Type *params[] = { SuperPtrTy, SelectorPtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                              params, true),
                                      "objc_msgSendSuper");
   }
 
   /// id objc_msgSendSuper2(struct objc_super *super, SEL op, ...)
   ///
   /// A slightly different messenger used for super calls.  The class
   /// passed is the current class.
-  llvm::Constant *getMessageSendSuperFn2() const {
+  llvm::FunctionCallee getMessageSendSuperFn2() const {
     llvm::Type *params[] = { SuperPtrTy, SelectorPtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                              params, true),
                                      "objc_msgSendSuper2");
   }
 
   /// void objc_msgSendSuper_stret(void *stretAddr, struct objc_super *super,
   ///                              SEL op, ...)
   ///
   /// The messenger used for super calls which return an aggregate indirectly.
-  llvm::Constant *getMessageSendSuperStretFn() const {
+  llvm::FunctionCallee getMessageSendSuperStretFn() const {
     llvm::Type *params[] = { Int8PtrTy, SuperPtrTy, SelectorPtrTy };
     return CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGM.VoidTy, params, true),
       "objc_msgSendSuper_stret");
   }
 
   /// void objc_msgSendSuper2_stret(void * stretAddr, struct objc_super *super,
   ///                               SEL op, ...)
   ///
   /// objc_msgSendSuper_stret with the super2 semantics.
-  llvm::Constant *getMessageSendSuperStretFn2() const {
+  llvm::FunctionCallee getMessageSendSuperStretFn2() const {
     llvm::Type *params[] = { Int8PtrTy, SuperPtrTy, SelectorPtrTy };
     return CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGM.VoidTy, params, true),
       "objc_msgSendSuper2_stret");
   }
 
-  llvm::Constant *getMessageSendSuperFpretFn() const {
+  llvm::FunctionCallee getMessageSendSuperFpretFn() const {
     // There is no objc_msgSendSuper_fpret? How can that work?
     return getMessageSendSuperFn();
   }
 
-  llvm::Constant *getMessageSendSuperFpretFn2() const {
+  llvm::FunctionCallee getMessageSendSuperFpretFn2() const {
     // There is no objc_msgSendSuper_fpret? How can that work?
     return getMessageSendSuperFn2();
   }
 
 protected:
   CodeGen::CodeGenModule &CGM;
 
 public:
public:
   // MethodTy - LLVM type for struct objc_method.
   llvm::StructType *MethodTy;
 
   /// CacheTy - LLVM type for struct objc_cache.
   llvm::Type *CacheTy;
   /// CachePtrTy - LLVM type for struct objc_cache *.
   llvm::PointerType *CachePtrTy;
 
-  llvm::Constant *getGetPropertyFn() {
+  llvm::FunctionCallee getGetPropertyFn() {
     CodeGen::CodeGenTypes &Types = CGM.getTypes();
     ASTContext &Ctx = CGM.getContext();
     // id objc_getProperty (id, SEL, ptrdiff_t, bool)
     CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
     CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
     CanQualType Params[] = {
         IdType, SelType,
         Ctx.getPointerDiffType()->getCanonicalTypeUnqualified(), Ctx.BoolTy};
     llvm::FunctionType *FTy =
         Types.GetFunctionType(
           Types.arrangeBuiltinFunctionDeclaration(IdType, Params));
     return CGM.CreateRuntimeFunction(FTy, "objc_getProperty");
   }
 
-  llvm::Constant *getSetPropertyFn() {
+  llvm::FunctionCallee getSetPropertyFn() {
     CodeGen::CodeGenTypes &Types = CGM.getTypes();
     ASTContext &Ctx = CGM.getContext();
     // void objc_setProperty (id, SEL, ptrdiff_t, id, bool, bool)
     CanQualType IdType = Ctx.getCanonicalParamType(Ctx.getObjCIdType());
     CanQualType SelType = Ctx.getCanonicalParamType(Ctx.getObjCSelType());
     CanQualType Params[] = {
         IdType,
         SelType,
         Ctx.getPointerDiffType()->getCanonicalTypeUnqualified(),
         IdType,
         Ctx.BoolTy,
         Ctx.BoolTy};
     llvm::FunctionType *FTy =
         Types.GetFunctionType(
           Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
     return CGM.CreateRuntimeFunction(FTy, "objc_setProperty");
   }
 
-  llvm::Constant *getOptimizedSetPropertyFn(bool atomic, bool copy) {
+  llvm::FunctionCallee getOptimizedSetPropertyFn(bool atomic, bool copy) {
     CodeGen::CodeGenTypes &Types = CGM.getTypes();
     ASTContext &Ctx = CGM.getContext();
     // void objc_setProperty_atomic(id self, SEL _cmd,
     //                              id newValue, ptrdiff_t offset);
     // void objc_setProperty_nonatomic(id self, SEL _cmd,
     //                                 id newValue, ptrdiff_t offset);
     // void objc_setProperty_atomic_copy(id self, SEL _cmd,
     //                                   id newValue, ptrdiff_t offset);
llvm::FunctionCallee getOptimizedSetPropertyFn(bool atomic, bool copy) {
     else if (!atomic && copy)
       name = "objc_setProperty_nonatomic_copy";
     else
       name = "objc_setProperty_nonatomic";
 
     return CGM.CreateRuntimeFunction(FTy, name);
   }
 
-  llvm::Constant *getCopyStructFn() {
+  llvm::FunctionCallee getCopyStructFn() {
     CodeGen::CodeGenTypes &Types = CGM.getTypes();
     ASTContext &Ctx = CGM.getContext();
     // void objc_copyStruct (void *, const void *, size_t, bool, bool)
     SmallVector<CanQualType,5> Params;
     Params.push_back(Ctx.VoidPtrTy);
     Params.push_back(Ctx.VoidPtrTy);
     Params.push_back(Ctx.getSizeType());
     Params.push_back(Ctx.BoolTy);
     Params.push_back(Ctx.BoolTy);
     llvm::FunctionType *FTy =
         Types.GetFunctionType(
           Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
     return CGM.CreateRuntimeFunction(FTy, "objc_copyStruct");
   }
 
   /// This routine declares and returns address of:
   /// void objc_copyCppObjectAtomic(
   ///         void *dest, const void *src,
   ///         void (*copyHelper) (void *dest, const void *source));
-  llvm::Constant *getCppAtomicObjectFunction() {
+  llvm::FunctionCallee getCppAtomicObjectFunction() {
     CodeGen::CodeGenTypes &Types = CGM.getTypes();
     ASTContext &Ctx = CGM.getContext();
     /// void objc_copyCppObjectAtomic(void *dest, const void *src, void *helper);
     SmallVector<CanQualType,3> Params;
     Params.push_back(Ctx.VoidPtrTy);
     Params.push_back(Ctx.VoidPtrTy);
     Params.push_back(Ctx.VoidPtrTy);
     llvm::FunctionType *FTy =
         Types.GetFunctionType(
           Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
     return CGM.CreateRuntimeFunction(FTy, "objc_copyCppObjectAtomic");
   }
 
-  llvm::Constant *getEnumerationMutationFn() {
+  llvm::FunctionCallee getEnumerationMutationFn() {
     CodeGen::CodeGenTypes &Types = CGM.getTypes();
     ASTContext &Ctx = CGM.getContext();
     // void objc_enumerationMutation (id)
     SmallVector<CanQualType,1> Params;
     Params.push_back(Ctx.getCanonicalParamType(Ctx.getObjCIdType()));
     llvm::FunctionType *FTy =
         Types.GetFunctionType(
           Types.arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Params));
     return CGM.CreateRuntimeFunction(FTy, "objc_enumerationMutation");
   }
 
-  llvm::Constant *getLookUpClassFn() {
+  llvm::FunctionCallee getLookUpClassFn() {
     CodeGen::CodeGenTypes &Types = CGM.getTypes();
     ASTContext &Ctx = CGM.getContext();
     // Class objc_lookUpClass (const char *)
     SmallVector<CanQualType,1> Params;
     Params.push_back(
       Ctx.getCanonicalType(Ctx.getPointerType(Ctx.CharTy.withConst())));
     llvm::FunctionType *FTy =
         Types.GetFunctionType(Types.arrangeBuiltinFunctionDeclaration(
                                 Ctx.getCanonicalType(Ctx.getObjCClassType()),
                                 Params));
     return CGM.CreateRuntimeFunction(FTy, "objc_lookUpClass");
   }
 
   /// GcReadWeakFn -- LLVM objc_read_weak (id *src) function.
-  llvm::Constant *getGcReadWeakFn() {
+  llvm::FunctionCallee getGcReadWeakFn() {
     // id objc_read_weak (id *)
     llvm::Type *args[] = { ObjectPtrTy->getPointerTo() };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(ObjectPtrTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_read_weak");
   }
 
   /// GcAssignWeakFn -- LLVM objc_assign_weak function.
-  llvm::Constant *getGcAssignWeakFn() {
+  llvm::FunctionCallee getGcAssignWeakFn() {
     // id objc_assign_weak (id, id *)
     llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(ObjectPtrTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_assign_weak");
   }
 
   /// GcAssignGlobalFn -- LLVM objc_assign_global function.
-  llvm::Constant *getGcAssignGlobalFn() {
+  llvm::FunctionCallee getGcAssignGlobalFn() {
     // id objc_assign_global(id, id *)
     llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(ObjectPtrTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_assign_global");
   }
 
   /// GcAssignThreadLocalFn -- LLVM objc_assign_threadlocal function.
-  llvm::Constant *getGcAssignThreadLocalFn() {
+  llvm::FunctionCallee getGcAssignThreadLocalFn() {
     // id objc_assign_threadlocal(id src, id * dest)
     llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(ObjectPtrTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_assign_threadlocal");
   }
 
   /// GcAssignIvarFn -- LLVM objc_assign_ivar function.
-  llvm::Constant *getGcAssignIvarFn() {
+  llvm::FunctionCallee getGcAssignIvarFn() {
     // id objc_assign_ivar(id, id *, ptrdiff_t)
     llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo(),
                            CGM.PtrDiffTy };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(ObjectPtrTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar");
   }
 
   /// GcMemmoveCollectableFn -- LLVM objc_memmove_collectable function.
-  llvm::Constant *GcMemmoveCollectableFn() {
+  llvm::FunctionCallee GcMemmoveCollectableFn() {
     // void *objc_memmove_collectable(void *dst, const void *src, size_t size)
     llvm::Type *args[] = { Int8PtrTy, Int8PtrTy, LongTy };
     llvm::FunctionType *FTy = llvm::FunctionType::get(Int8PtrTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_memmove_collectable");
   }
 
   /// GcAssignStrongCastFn -- LLVM objc_assign_strongCast function.
-  llvm::Constant *getGcAssignStrongCastFn() {
+  llvm::FunctionCallee getGcAssignStrongCastFn() {
     // id objc_assign_strongCast(id, id *)
     llvm::Type *args[] = { ObjectPtrTy, ObjectPtrTy->getPointerTo() };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(ObjectPtrTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast");
   }
 
   /// ExceptionThrowFn - LLVM objc_exception_throw function.
-  llvm::Constant *getExceptionThrowFn() {
+  llvm::FunctionCallee getExceptionThrowFn() {
     // void objc_exception_throw(id)
     llvm::Type *args[] = { ObjectPtrTy };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(CGM.VoidTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_exception_throw");
   }
 
   /// ExceptionRethrowFn - LLVM objc_exception_rethrow function.
-  llvm::Constant *getExceptionRethrowFn() {
+  llvm::FunctionCallee getExceptionRethrowFn() {
     // void objc_exception_rethrow(void)
     llvm::FunctionType *FTy = llvm::FunctionType::get(CGM.VoidTy, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_exception_rethrow");
   }
 
   /// SyncEnterFn - LLVM object_sync_enter function.
-  llvm::Constant *getSyncEnterFn() {
+  llvm::FunctionCallee getSyncEnterFn() {
     // int objc_sync_enter (id)
     llvm::Type *args[] = { ObjectPtrTy };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(CGM.IntTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_sync_enter");
   }
 
   /// SyncExitFn - LLVM object_sync_exit function.
-  llvm::Constant *getSyncExitFn() {
+  llvm::FunctionCallee getSyncExitFn() {
     // int objc_sync_exit (id)
     llvm::Type *args[] = { ObjectPtrTy };
     llvm::FunctionType *FTy =
       llvm::FunctionType::get(CGM.IntTy, args, false);
     return CGM.CreateRuntimeFunction(FTy, "objc_sync_exit");
   }
 
-  llvm::Constant *getSendFn(bool IsSuper) const {
+  llvm::FunctionCallee getSendFn(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperFn() : getMessageSendFn();
   }
 
-  llvm::Constant *getSendFn2(bool IsSuper) const {
+  llvm::FunctionCallee getSendFn2(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperFn2() : getMessageSendFn();
   }
 
-  llvm::Constant *getSendStretFn(bool IsSuper) const {
+  llvm::FunctionCallee getSendStretFn(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperStretFn() : getMessageSendStretFn();
   }
 
-  llvm::Constant *getSendStretFn2(bool IsSuper) const {
+  llvm::FunctionCallee getSendStretFn2(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperStretFn2() : getMessageSendStretFn();
   }
 
-  llvm::Constant *getSendFpretFn(bool IsSuper) const {
+  llvm::FunctionCallee getSendFpretFn(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperFpretFn() : getMessageSendFpretFn();
   }
 
-  llvm::Constant *getSendFpretFn2(bool IsSuper) const {
+  llvm::FunctionCallee getSendFpretFn2(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperFpretFn2() : getMessageSendFpretFn();
   }
 
-  llvm::Constant *getSendFp2retFn(bool IsSuper) const {
+  llvm::FunctionCallee getSendFp2retFn(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperFn() : getMessageSendFp2retFn();
   }
 
-  llvm::Constant *getSendFp2RetFn2(bool IsSuper) const {
+  llvm::FunctionCallee getSendFp2RetFn2(bool IsSuper) const {
     return IsSuper ? getMessageSendSuperFn2() : getMessageSendFp2retFn();
   }
 
   ObjCCommonTypesHelper(CodeGen::CodeGenModule &cgm);
 };
 
 /// ObjCTypesHelper - Helper class that encapsulates lazy
 /// construction of varies types used during ObjC generation.
public:
   llvm::StructType *MethodListTy;
   /// MethodListPtrTy - LLVM type for struct objc_method_list *.
   llvm::PointerType *MethodListPtrTy;
 
   /// ExceptionDataTy - LLVM type for struct _objc_exception_data.
   llvm::StructType *ExceptionDataTy;
 
   /// ExceptionTryEnterFn - LLVM objc_exception_try_enter function.
-  llvm::Constant *getExceptionTryEnterFn() {
+  llvm::FunctionCallee getExceptionTryEnterFn() {
     llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
     return CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGM.VoidTy, params, false),
       "objc_exception_try_enter");
   }
 
   /// ExceptionTryExitFn - LLVM objc_exception_try_exit function.
-  llvm::Constant *getExceptionTryExitFn() {
+  llvm::FunctionCallee getExceptionTryExitFn() {
     llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
     return CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGM.VoidTy, params, false),
       "objc_exception_try_exit");
   }
 
   /// ExceptionExtractFn - LLVM objc_exception_extract function.
-  llvm::Constant *getExceptionExtractFn() {
+  llvm::FunctionCallee getExceptionExtractFn() {
     llvm::Type *params[] = { ExceptionDataTy->getPointerTo() };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                              params, false),
                                      "objc_exception_extract");
   }
 
   /// ExceptionMatchFn - LLVM objc_exception_match function.
-  llvm::Constant *getExceptionMatchFn() {
+  llvm::FunctionCallee getExceptionMatchFn() {
     llvm::Type *params[] = { ClassPtrTy, ObjectPtrTy };
     return CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGM.Int32Ty, params, false),
       "objc_exception_match");
   }
 
   /// SetJmpFn - LLVM _setjmp function.
-  llvm::Constant *getSetJmpFn() {
+  llvm::FunctionCallee getSetJmpFn() {
     // This is specifically the prototype for x86.
     llvm::Type *params[] = { CGM.Int32Ty->getPointerTo() };
     return CGM.CreateRuntimeFunction(
         llvm::FunctionType::get(CGM.Int32Ty, params, false), "_setjmp",
         llvm::AttributeList::get(CGM.getLLVMContext(),
                                  llvm::AttributeList::FunctionIndex,
                                  llvm::Attribute::NonLazyBind));
   }
public:
   //   SUPER_IMP messenger;
   //   SEL name;
   // };
   llvm::StructType *SuperMessageRefTy;
 
   // SuperMessageRefPtrTy - LLVM for struct _super_message_ref_t*
   llvm::PointerType *SuperMessageRefPtrTy;
 
-  llvm::Constant *getMessageSendFixupFn() {
+  llvm::FunctionCallee getMessageSendFixupFn() {
     // id objc_msgSend_fixup(id, struct message_ref_t*, ...)
     llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                              params, true),
                                      "objc_msgSend_fixup");
   }
 
-  llvm::Constant *getMessageSendFpretFixupFn() {
+  llvm::FunctionCallee getMessageSendFpretFixupFn() {
     // id objc_msgSend_fpret_fixup(id, struct message_ref_t*, ...)
     llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                              params, true),
                                      "objc_msgSend_fpret_fixup");
   }
 
-  llvm::Constant *getMessageSendStretFixupFn() {
+  llvm::FunctionCallee getMessageSendStretFixupFn() {
     // id objc_msgSend_stret_fixup(id, struct message_ref_t*, ...)
     llvm::Type *params[] = { ObjectPtrTy, MessageRefPtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                              params, true),
                                      "objc_msgSend_stret_fixup");
   }
 
-  llvm::Constant *getMessageSendSuper2FixupFn() {
+  llvm::FunctionCallee getMessageSendSuper2FixupFn() {
     // id objc_msgSendSuper2_fixup (struct objc_super *,
     //                              struct _super_message_ref_t*, ...)
     llvm::Type *params[] = { SuperPtrTy, SuperMessageRefPtrTy };
     return  CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                               params, true),
                                       "objc_msgSendSuper2_fixup");
   }
 
-  llvm::Constant *getMessageSendSuper2StretFixupFn() {
+  llvm::FunctionCallee getMessageSendSuper2StretFixupFn() {
     // id objc_msgSendSuper2_stret_fixup(struct objc_super *,
     //                                   struct _super_message_ref_t*, ...)
     llvm::Type *params[] = { SuperPtrTy, SuperMessageRefPtrTy };
     return  CGM.CreateRuntimeFunction(llvm::FunctionType::get(ObjectPtrTy,
                                                               params, true),
                                       "objc_msgSendSuper2_stret_fixup");
   }
 
-  llvm::Constant *getObjCEndCatchFn() {
+  llvm::FunctionCallee getObjCEndCatchFn() {
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.VoidTy, false),
                                      "objc_end_catch");
-
   }
 
-  llvm::Constant *getObjCBeginCatchFn() {
+  llvm::FunctionCallee getObjCBeginCatchFn() {
     llvm::Type *params[] = { Int8PtrTy };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(Int8PtrTy,
                                                              params, false),
                                      "objc_begin_catch");
   }
 
   llvm::StructType *EHTypeTy;
   llvm::Type *EHTypePtrTy;
public:
 
   void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
 
   void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {}
 
   llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
                                    const ObjCProtocolDecl *PD) override;
 
-  llvm::Constant *GetPropertyGetFunction() override;
-  llvm::Constant *GetPropertySetFunction() override;
-  llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
+  llvm::FunctionCallee GetPropertyGetFunction() override;
+  llvm::FunctionCallee GetPropertySetFunction() override;
+  llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
                                                        bool copy) override;
-  llvm::Constant *GetGetStructFunction() override;
-  llvm::Constant *GetSetStructFunction() override;
-  llvm::Constant *GetCppAtomicObjectGetFunction() override;
-  llvm::Constant *GetCppAtomicObjectSetFunction() override;
-  llvm::Constant *EnumerationMutationFunction() override;
+  llvm::FunctionCallee GetGetStructFunction() override;
+  llvm::FunctionCallee GetSetStructFunction() override;
+  llvm::FunctionCallee GetCppAtomicObjectGetFunction() override;
+  llvm::FunctionCallee GetCppAtomicObjectSetFunction() override;
+  llvm::FunctionCallee EnumerationMutationFunction() override;
 
   void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
                    const ObjCAtTryStmt &S) override;
   void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
                             const ObjCAtSynchronizedStmt &S) override;
   void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, const Stmt &S);
   void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtThrowStmt &S,
                      bool ClearInsertionPoint=true) override;
public:
 
   void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override {}
 
   llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
                                    const ObjCProtocolDecl *PD) override;
 
   llvm::Constant *GetEHType(QualType T) override;
 
-  llvm::Constant *GetPropertyGetFunction() override {
+  llvm::FunctionCallee GetPropertyGetFunction() override {
     return ObjCTypes.getGetPropertyFn();
   }
-  llvm::Constant *GetPropertySetFunction() override {
+  llvm::FunctionCallee GetPropertySetFunction() override {
     return ObjCTypes.getSetPropertyFn();
   }
 
-  llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
+  llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
                                                        bool copy) override {
     return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy);
   }
 
-  llvm::Constant *GetSetStructFunction() override {
+  llvm::FunctionCallee GetSetStructFunction() override {
     return ObjCTypes.getCopyStructFn();
   }
 
-  llvm::Constant *GetGetStructFunction() override {
+  llvm::FunctionCallee GetGetStructFunction() override {
     return ObjCTypes.getCopyStructFn();
   }
 
-  llvm::Constant *GetCppAtomicObjectSetFunction() override {
+  llvm::FunctionCallee GetCppAtomicObjectSetFunction() override {
     return ObjCTypes.getCppAtomicObjectFunction();
   }
 
-  llvm::Constant *GetCppAtomicObjectGetFunction() override {
+  llvm::FunctionCallee GetCppAtomicObjectGetFunction() override {
     return ObjCTypes.getCppAtomicObjectFunction();
   }
 
-  llvm::Constant *EnumerationMutationFunction() override {
+  llvm::FunctionCallee EnumerationMutationFunction() override {
     return ObjCTypes.getEnumerationMutationFn();
   }
 
   void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
                    const ObjCAtTryStmt &S) override;
   void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
                             const ObjCAtSynchronizedStmt &S) override;
   void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, const ObjCAtThrowStmt &S,
if (Self->getType().isConstQualified()) {
           ReceiverCanBeNull = false;
         }
       }
     }
   }
 
   bool RequiresNullCheck = false;
 
-  llvm::Constant *Fn = nullptr;
+  llvm::FunctionCallee Fn = nullptr;
   if (CGM.ReturnSlotInterferesWithArgs(MSI.CallInfo)) {
     if (ReceiverCanBeNull) RequiresNullCheck = true;
     Fn = (ObjCABI == 2) ?  ObjCTypes.getSendStretFn2(IsSuper)
       : ObjCTypes.getSendStretFn(IsSuper);
   } else if (CGM.ReturnTypeUsesFPRet(ResultType)) {
     Fn = (ObjCABI == 2) ? ObjCTypes.getSendFpretFn2(IsSuper)
       : ObjCTypes.getSendFpretFn(IsSuper);
   } else if (CGM.ReturnTypeUsesFP2Ret(ResultType)) {
     Fn = (ObjCABI == 2) ? ObjCTypes.getSendFp2RetFn2(IsSuper)
       : ObjCTypes.getSendFp2retFn(IsSuper);
   } else {
     // arm64 uses objc_msgSend for stret methods and yet null receiver check
     // must be made for it.
     if (ReceiverCanBeNull && CGM.ReturnTypeUsesSRet(MSI.CallInfo))
       RequiresNullCheck = true;
     Fn = (ObjCABI == 2) ? ObjCTypes.getSendFn2(IsSuper)
       : ObjCTypes.getSendFn(IsSuper);
   }
 
+  // Cast function to proper signature
+  llvm::Constant *BitcastFn = cast<llvm::Constant>(
+      CGF.Builder.CreateBitCast(Fn.getCallee(), MSI.MessengerType));
+
   // We don't need to emit a null check to zero out an indirect result if the
   // result is ignored.
   if (Return.isUnused())
     RequiresNullCheck = false;
 
   // Emit a null-check if there's a consumed argument other than the receiver.
   if (!RequiresNullCheck && CGM.getLangOpts().ObjCAutoRefCount && Method) {
     for (const auto *ParamDecl : Method->parameters()) {
       if (ParamDecl->hasAttr<NSConsumedAttr>()) {
         RequiresNullCheck = true;
         break;
       }
     }
   }
 
   NullReturnState nullReturn;
   if (RequiresNullCheck) {
     nullReturn.init(CGF, Arg0);
   }
 
   llvm::CallBase *CallSite;
-  Fn = llvm::ConstantExpr::getBitCast(Fn, MSI.MessengerType);
-  CGCallee Callee = CGCallee::forDirect(Fn);
+  CGCallee Callee = CGCallee::forDirect(BitcastFn);
   RValue rvalue = CGF.EmitCall(MSI.CallInfo, Callee, Return, ActualArgs,
                                &CallSite);
 
   // Mark the call as noreturn if the method is marked noreturn and the
   // receiver cannot be null.
   if (Method && Method->hasAttr<NoReturnAttr>() && !ReceiverCanBeNull) {
     CallSite->setDoesNotReturn();
   }
llvm::Constant *CGObjCCommonMac::GetProtocolRef(const ObjCProtocolDecl *PD) {
 
   return GetOrEmitProtocolRef(PD);
 }
 
 llvm::Value *CGObjCCommonMac::EmitClassRefViaRuntime(
                CodeGenFunction &CGF,
                const ObjCInterfaceDecl *ID,
                ObjCCommonTypesHelper &ObjCTypes) {
-  llvm::Constant *lookUpClassFn = ObjCTypes.getLookUpClassFn();
+  llvm::FunctionCallee lookUpClassFn = ObjCTypes.getLookUpClassFn();
 
   llvm::Value *className =
       CGF.CGM.GetAddrOfConstantCString(ID->getObjCRuntimeNameAsString())
         .getPointer();
   ASTContext &ctx = CGF.CGM.getContext();
   className =
       CGF.Builder.CreateBitCast(className,
                                 CGF.ConvertType(

 }
 
 llvm::Function *CGObjCMac::ModuleInitFunction() {
   // Abuse this interface function as a place to finalize.
   FinishModule();
   return nullptr;
 }
 
-llvm::Constant *CGObjCMac::GetPropertyGetFunction() {
+llvm::FunctionCallee CGObjCMac::GetPropertyGetFunction() {
   return ObjCTypes.getGetPropertyFn();
 }
 
-llvm::Constant *CGObjCMac::GetPropertySetFunction() {
+llvm::FunctionCallee CGObjCMac::GetPropertySetFunction() {
   return ObjCTypes.getSetPropertyFn();
 }
 
-llvm::Constant *CGObjCMac::GetOptimizedPropertySetFunction(bool atomic,
+llvm::FunctionCallee CGObjCMac::GetOptimizedPropertySetFunction(bool atomic,
                                                                 bool copy) {
   return ObjCTypes.getOptimizedSetPropertyFn(atomic, copy);
 }
 
-llvm::Constant *CGObjCMac::GetGetStructFunction() {
+llvm::FunctionCallee CGObjCMac::GetGetStructFunction() {
   return ObjCTypes.getCopyStructFn();
 }
 
-llvm::Constant *CGObjCMac::GetSetStructFunction() {
+llvm::FunctionCallee CGObjCMac::GetSetStructFunction() {
   return ObjCTypes.getCopyStructFn();
 }
 
-llvm::Constant *CGObjCMac::GetCppAtomicObjectGetFunction() {
+llvm::FunctionCallee CGObjCMac::GetCppAtomicObjectGetFunction() {
   return ObjCTypes.getCppAtomicObjectFunction();
 }
 
-llvm::Constant *CGObjCMac::GetCppAtomicObjectSetFunction() {
+llvm::FunctionCallee CGObjCMac::GetCppAtomicObjectSetFunction() {
   return ObjCTypes.getCppAtomicObjectFunction();
 }
 
-llvm::Constant *CGObjCMac::EnumerationMutationFunction() {
+llvm::FunctionCallee CGObjCMac::EnumerationMutationFunction() {
   return ObjCTypes.getEnumerationMutationFn();
 }
 
 void CGObjCMac::EmitTryStmt(CodeGenFunction &CGF, const ObjCAtTryStmt &S) {
   return EmitTryOrSynchronizedStmt(CGF, S);
 }
 
 void CGObjCMac::EmitSynchronizedStmt(CodeGenFunction &CGF,
CGObjCNonFragileABIMac::EmitVTableMessageSend(CodeGenFunction &CGF,
 
   // Find the function to call and the mangled name for the message
   // ref structure.  Using a different mangled name wouldn't actually
   // be a problem; it would just be a waste.
   //
   // The runtime currently never uses vtable dispatch for anything
   // except normal, non-super message-sends.
   // FIXME: don't use this for that.
-  llvm::Constant *fn = nullptr;
+  llvm::FunctionCallee fn = nullptr;
   std::string messageRefName("\01l_");
   if (CGM.ReturnSlotInterferesWithArgs(MSI.CallInfo)) {
     if (isSuper) {
       fn = ObjCTypes.getMessageSendSuper2StretFixupFn();
       messageRefName += "objc_msgSendSuper2_stret_fixup";
     } else {
       nullReturn.init(CGF, arg0);
       fn = ObjCTypes.getMessageSendStretFixupFn();
CGObjCNonFragileABIMac::EmitVTableMessageSend(CodeGenFunction &CGF,
   appendSelectorForMessageRefTable(messageRefName, selector);
 
   llvm::GlobalVariable *messageRef
     = CGM.getModule().getGlobalVariable(messageRefName);
   if (!messageRef) {
     // Build the message ref structure.
     ConstantInitBuilder builder(CGM);
     auto values = builder.beginStruct();
-    values.add(fn);
+    values.add(cast<llvm::Constant>(fn.getCallee()));
     values.add(GetMethodVarName(selector));
     messageRef = values.finishAndCreateGlobal(messageRefName,
                                               CharUnits::fromQuantity(16),
                                               /*constant*/ false,
                                         llvm::GlobalValue::WeakAnyLinkage);
     messageRef->setVisibility(llvm::GlobalValue::HiddenVisibility);
     messageRef->setSection(GetSectionName("__objc_msgrefs", "coalesced"));
   }
void CGObjCNonFragileABIMac::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
   else
     CGF.EmitNounwindRuntimeCall(ObjCTypes.getGcAssignThreadLocalFn(),
                                 args, "threadlocalassign");
 }
 
 void
 CGObjCNonFragileABIMac::EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
                                              const ObjCAtSynchronizedStmt &S) {
-  EmitAtSynchronizedStmt(CGF, S,
-      cast<llvm::Function>(ObjCTypes.getSyncEnterFn()),
-      cast<llvm::Function>(ObjCTypes.getSyncExitFn()));
+  EmitAtSynchronizedStmt(CGF, S, ObjCTypes.getSyncEnterFn(),
+                         ObjCTypes.getSyncExitFn());
 }
 
 llvm::Constant *
 CGObjCNonFragileABIMac::GetEHType(QualType T) {
   // There's a particular fixed type info for 'id'.
   if (T->isObjCIdType() || T->isObjCQualifiedIdType()) {
     auto *IDEHType = CGM.getModule().getGlobalVariable("OBJC_EHTYPE_id");
     if (!IDEHType) {
CGObjCNonFragileABIMac::GetEHType(QualType T) {
   const ObjCInterfaceType *IT = PT->getInterfaceType();
   assert(IT && "Invalid @catch type.");
 
   return GetInterfaceEHType(IT->getDecl(), NotForDefinition);
 }
 
 void CGObjCNonFragileABIMac::EmitTryStmt(CodeGen::CodeGenFunction &CGF,
                                          const ObjCAtTryStmt &S) {
-  EmitTryCatchStmt(CGF, S,
-      cast<llvm::Function>(ObjCTypes.getObjCBeginCatchFn()),
-      cast<llvm::Function>(ObjCTypes.getObjCEndCatchFn()),
-      cast<llvm::Function>(ObjCTypes.getExceptionRethrowFn()));
+  EmitTryCatchStmt(CGF, S, ObjCTypes.getObjCBeginCatchFn(),
+                   ObjCTypes.getObjCEndCatchFn(),
+                   ObjCTypes.getExceptionRethrowFn());
 }
 
 /// EmitThrowStmt - Generate code for a throw statement.
 void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
                                            const ObjCAtThrowStmt &S,
                                            bool ClearInsertionPoint) {
   if (const Expr *ThrowExpr = S.getThrowExpr()) {
     llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);

lib/CodeGen/CGObjCRuntime.h

LValue EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF,
                                   llvm::Value *Offset);
   /// Emits a try / catch statement.  This function is intended to be called by
   /// subclasses, and provides a generic mechanism for generating these, which
   /// should be usable by all runtimes.  The caller must provide the functions
   /// to call when entering and exiting a \@catch() block, and the function
   /// used to rethrow exceptions.  If the begin and end catch functions are
   /// NULL, then the function assumes that the EH personality function provides
   /// the thrown object directly.
-  void EmitTryCatchStmt(CodeGenFunction &CGF,
-                        const ObjCAtTryStmt &S,
-                        llvm::Constant *beginCatchFn,
-                        llvm::Constant *endCatchFn,
-                        llvm::Constant *exceptionRethrowFn);
+  void EmitTryCatchStmt(CodeGenFunction &CGF, const ObjCAtTryStmt &S,
+                        llvm::FunctionCallee beginCatchFn,
+                        llvm::FunctionCallee endCatchFn,
+                        llvm::FunctionCallee exceptionRethrowFn);
 
   void EmitInitOfCatchParam(CodeGenFunction &CGF, llvm::Value *exn,
                             const VarDecl *paramDecl);
 
   /// Emits an \@synchronize() statement, using the \p syncEnterFn and
   /// \p syncExitFn arguments as the functions called to lock and unlock
   /// the object.  This function can be called by subclasses that use
   /// zero-cost exception handling.
   void EmitAtSynchronizedStmt(CodeGenFunction &CGF,
                               const ObjCAtSynchronizedStmt &S,
-                            llvm::Function *syncEnterFn,
-                            llvm::Function *syncExitFn);
+                              llvm::FunctionCallee syncEnterFn,
+                              llvm::FunctionCallee syncExitFn);
 
 public:
   virtual ~CGObjCRuntime();
 
   /// Generate the function required to register all Objective-C components in
   /// this compilation unit with the runtime library.
   virtual llvm::Function *ModuleInitFunction() = 0;
 
public:
 
   // FIXME: Current this just generates the Function definition, but really this
   // should also be generating the loads of the parameters, as the runtime
   // should have full control over how parameters are passed.
   virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
                                          const ObjCContainerDecl *CD) = 0;
 
   /// Return the runtime function for getting properties.
-  virtual llvm::Constant *GetPropertyGetFunction() = 0;
+  virtual llvm::FunctionCallee GetPropertyGetFunction() = 0;
 
   /// Return the runtime function for setting properties.
-  virtual llvm::Constant *GetPropertySetFunction() = 0;
+  virtual llvm::FunctionCallee GetPropertySetFunction() = 0;
 
   /// Return the runtime function for optimized setting properties.
-  virtual llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
+  virtual llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
                                                                bool copy) = 0;
 
   // API for atomic copying of qualified aggregates in getter.
-  virtual llvm::Constant *GetGetStructFunction() = 0;
+  virtual llvm::FunctionCallee GetGetStructFunction() = 0;
   // API for atomic copying of qualified aggregates in setter.
-  virtual llvm::Constant *GetSetStructFunction() = 0;
+  virtual llvm::FunctionCallee GetSetStructFunction() = 0;
   /// API for atomic copying of qualified aggregates with non-trivial copy
   /// assignment (c++) in setter.
-  virtual llvm::Constant *GetCppAtomicObjectSetFunction() = 0;
+  virtual llvm::FunctionCallee GetCppAtomicObjectSetFunction() = 0;
   /// API for atomic copying of qualified aggregates with non-trivial copy
   /// assignment (c++) in getter.
-  virtual llvm::Constant *GetCppAtomicObjectGetFunction() = 0;
+  virtual llvm::FunctionCallee GetCppAtomicObjectGetFunction() = 0;
 
   /// GetClass - Return a reference to the class for the given
   /// interface decl.
   virtual llvm::Value *GetClass(CodeGenFunction &CGF,
                                 const ObjCInterfaceDecl *OID) = 0;
 
 
   virtual llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) {
     llvm_unreachable("autoreleasepool unsupported in this ABI");
   }
 
   /// EnumerationMutationFunction - Return the function that's called by the
   /// compiler when a mutation is detected during foreach iteration.
-  virtual llvm::Constant *EnumerationMutationFunction() = 0;
+  virtual llvm::FunctionCallee EnumerationMutationFunction() = 0;
 
   virtual void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
                                     const ObjCAtSynchronizedStmt &S) = 0;
   virtual void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
                            const ObjCAtTryStmt &S) = 0;
   virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
                              const ObjCAtThrowStmt &S,
                              bool ClearInsertionPoint=true) = 0;

lib/CodeGen/CGObjCRuntime.cpp

struct CatchHandler {
     const Stmt *Body;
     llvm::BasicBlock *Block;
     llvm::Constant *TypeInfo;
     /// Flags used to differentiate cleanups and catchalls in Windows SEH
     unsigned Flags;
   };
 
   struct CallObjCEndCatch final : EHScopeStack::Cleanup {
-    CallObjCEndCatch(bool MightThrow, llvm::Value *Fn)
+    CallObjCEndCatch(bool MightThrow, llvm::FunctionCallee Fn)
         : MightThrow(MightThrow), Fn(Fn) {}
     bool MightThrow;
-    llvm::Value *Fn;
+    llvm::FunctionCallee Fn;
 
     void Emit(CodeGenFunction &CGF, Flags flags) override {
       if (MightThrow)
         CGF.EmitRuntimeCallOrInvoke(Fn);
       else
         CGF.EmitNounwindRuntimeCall(Fn);
     }
   };
 }
 
-
 void CGObjCRuntime::EmitTryCatchStmt(CodeGenFunction &CGF,
                                      const ObjCAtTryStmt &S,
-                                     llvm::Constant *beginCatchFn,
-                                     llvm::Constant *endCatchFn,
-                                     llvm::Constant *exceptionRethrowFn) {
+                                     llvm::FunctionCallee beginCatchFn,
+                                     llvm::FunctionCallee endCatchFn,
+                                     llvm::FunctionCallee exceptionRethrowFn) {
   // Jump destination for falling out of catch bodies.
   CodeGenFunction::JumpDest Cont;
   if (S.getNumCatchStmts())
     Cont = CGF.getJumpDestInCurrentScope("eh.cont");
 
   bool useFunclets = EHPersonality::get(CGF).usesFuncletPads();
 
   CodeGenFunction::FinallyInfo FinallyInfo;
case Qualifiers::OCL_Weak:
     CGF.EmitARCInitWeak(paramAddr, exn);
     return;
   }
   llvm_unreachable("invalid ownership qualifier");
 }
 
 namespace {
   struct CallSyncExit final : EHScopeStack::Cleanup {
-    llvm::Value *SyncExitFn;
+    llvm::FunctionCallee SyncExitFn;
     llvm::Value *SyncArg;
-    CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
+    CallSyncExit(llvm::FunctionCallee SyncExitFn, llvm::Value *SyncArg)
         : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
 
     void Emit(CodeGenFunction &CGF, Flags flags) override {
       CGF.EmitNounwindRuntimeCall(SyncExitFn, SyncArg);
     }
   };
 }
 
 void CGObjCRuntime::EmitAtSynchronizedStmt(CodeGenFunction &CGF,
                                            const ObjCAtSynchronizedStmt &S,
-                                           llvm::Function *syncEnterFn,
-                                           llvm::Function *syncExitFn) {
+                                           llvm::FunctionCallee syncEnterFn,
+                                           llvm::FunctionCallee syncExitFn) {
   CodeGenFunction::RunCleanupsScope cleanups(CGF);
 
   // Evaluate the lock operand.  This is guaranteed to dominate the
   // ARC release and lock-release cleanups.
   const Expr *lockExpr = S.getSynchExpr();
   llvm::Value *lock;
   if (CGF.getLangOpts().ObjCAutoRefCount) {
     lock = CGF.EmitARCRetainScalarExpr(lockExpr);

lib/CodeGen/CGOpenMPRuntime.h

protected:
   llvm::Value *getThreadID(CodeGenFunction &CGF, SourceLocation Loc);
 
   /// Get the function name of an outlined region.
   //  The name can be customized depending on the target.
   //
   virtual StringRef getOutlinedHelperName() const { return ".omp_outlined."; }
 
   /// Emits \p Callee function call with arguments \p Args with location \p Loc.
-  void emitCall(CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *Callee,
+  void emitCall(CodeGenFunction &CGF, SourceLocation Loc,
+                llvm::FunctionCallee Callee,
                 ArrayRef<llvm::Value *> Args = llvm::None) const;
 
   /// Emits address of the word in a memory where current thread id is
   /// stored.
   virtual Address emitThreadIDAddress(CodeGenFunction &CGF, SourceLocation Loc);
 
   void setLocThreadIdInsertPt(CodeGenFunction &CGF,
                               bool AtCurrentPoint = false);
private:
   void emitKmpRoutineEntryT(QualType KmpInt32Ty);
 
   /// Returns pointer to kmpc_micro type.
   llvm::Type *getKmpc_MicroPointerTy();
 
   /// Returns specified OpenMP runtime function.
   /// \param Function OpenMP runtime function.
   /// \return Specified function.
-  llvm::Constant *createRuntimeFunction(unsigned Function);
+  llvm::FunctionCallee createRuntimeFunction(unsigned Function);
 
   /// Returns __kmpc_for_static_init_* runtime function for the specified
   /// size \a IVSize and sign \a IVSigned.
-  llvm::Constant *createForStaticInitFunction(unsigned IVSize, bool IVSigned);
+  llvm::FunctionCallee createForStaticInitFunction(unsigned IVSize,
+                                                   bool IVSigned);
 
   /// Returns __kmpc_dispatch_init_* runtime function for the specified
   /// size \a IVSize and sign \a IVSigned.
-  llvm::Constant *createDispatchInitFunction(unsigned IVSize, bool IVSigned);
+  llvm::FunctionCallee createDispatchInitFunction(unsigned IVSize,
+                                                  bool IVSigned);
 
   /// Returns __kmpc_dispatch_next_* runtime function for the specified
   /// size \a IVSize and sign \a IVSigned.
-  llvm::Constant *createDispatchNextFunction(unsigned IVSize, bool IVSigned);
+  llvm::FunctionCallee createDispatchNextFunction(unsigned IVSize,
+                                                  bool IVSigned);
 
   /// Returns __kmpc_dispatch_fini_* runtime function for the specified
   /// size \a IVSize and sign \a IVSigned.
-  llvm::Constant *createDispatchFiniFunction(unsigned IVSize, bool IVSigned);
+  llvm::FunctionCallee createDispatchFiniFunction(unsigned IVSize,
+                                                  bool IVSigned);
 
   /// If the specified mangled name is not in the module, create and
   /// return threadprivate cache object. This object is a pointer's worth of
   /// storage that's reserved for use by the OpenMP runtime.
   /// \param VD Threadprivate variable.
   /// \return Cache variable for the specified threadprivate.
   llvm::Constant *getOrCreateThreadPrivateCache(const VarDecl *VD);
 
private:
   /// \param Dtor Pointer to a global destructor function for \a VD.
   /// \param Loc Location of threadprivate declaration.
   void emitThreadPrivateVarInit(CodeGenFunction &CGF, Address VDAddr,
                                 llvm::Value *Ctor, llvm::Value *CopyCtor,
                                 llvm::Value *Dtor, SourceLocation Loc);
 
   struct TaskResultTy {
     llvm::Value *NewTask = nullptr;
-    llvm::Value *TaskEntry = nullptr;
+    llvm::Function *TaskEntry = nullptr;
     llvm::Value *NewTaskNewTaskTTy = nullptr;
     LValue TDBase;
     const RecordDecl *KmpTaskTQTyRD = nullptr;
     llvm::Value *TaskDupFn = nullptr;
   };
   /// Emit task region for the task directive. The task region is emitted in
   /// several steps:
   /// 1. Emit a call to kmp_task_t *__kmpc_omp_task_alloc(ident_t *, kmp_int32
private:
   /// /*part_id*/, captured_struct */*__context*/);
   /// \param SharedsTy A type which contains references the shared variables.
   /// \param Shareds Context with the list of shared variables from the \p
   /// TaskFunction.
   /// \param Data Additional data for task generation like tiednsee, final
   /// state, list of privates etc.
   TaskResultTy emitTaskInit(CodeGenFunction &CGF, SourceLocation Loc,
                             const OMPExecutableDirective &D,
-                            llvm::Value *TaskFunction, QualType SharedsTy,
+                            llvm::Function *TaskFunction, QualType SharedsTy,
                             Address Shareds, const OMPTaskDataTy &Data);
 
 public:
   explicit CGOpenMPRuntime(CodeGenModule &CGM)
       : CGOpenMPRuntime(CGM, ".", ".") {}
   virtual ~CGOpenMPRuntime() {}
   virtual void clear();
 
public:
   /// Emits outlined function for the specified OpenMP parallel directive
   /// \a D. This outlined function has type void(*)(kmp_int32 *ThreadID,
   /// kmp_int32 BoundID, struct context_vars*).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
-  virtual llvm::Value *emitParallelOutlinedFunction(
+  virtual llvm::Function *emitParallelOutlinedFunction(
       const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
       OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen);
 
   /// Emits outlined function for the specified OpenMP teams directive
   /// \a D. This outlined function has type void(*)(kmp_int32 *ThreadID,
   /// kmp_int32 BoundID, struct context_vars*).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
-  virtual llvm::Value *emitTeamsOutlinedFunction(
+  virtual llvm::Function *emitTeamsOutlinedFunction(
       const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
       OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen);
 
   /// Emits outlined function for the OpenMP task directive \a D. This
   /// outlined function has type void(*)(kmp_int32 ThreadID, struct task_t*
   /// TaskT).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param PartIDVar Variable for partition id in the current OpenMP untied
   /// task region.
   /// \param TaskTVar Variable for task_t argument.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
   /// \param Tied true if task is generated for tied task, false otherwise.
   /// \param NumberOfParts Number of parts in untied task. Ignored for tied
   /// tasks.
   ///
-  virtual llvm::Value *emitTaskOutlinedFunction(
+  virtual llvm::Function *emitTaskOutlinedFunction(
       const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
       const VarDecl *PartIDVar, const VarDecl *TaskTVar,
       OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen,
       bool Tied, unsigned &NumberOfParts);
 
   /// Cleans up references to the objects in finished function.
   ///
   virtual void functionFinished(CodeGenFunction &CGF);
 
   /// Emits code for parallel or serial call of the \a OutlinedFn with
   /// variables captured in a record which address is stored in \a
   /// CapturedStruct.
   /// \param OutlinedFn Outlined function to be run in parallel threads. Type of
   /// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
   /// \param CapturedVars A pointer to the record with the references to
   /// variables used in \a OutlinedFn function.
   /// \param IfCond Condition in the associated 'if' clause, if it was
   /// specified, nullptr otherwise.
   ///
   virtual void emitParallelCall(CodeGenFunction &CGF, SourceLocation Loc,
-                                llvm::Value *OutlinedFn,
+                                llvm::Function *OutlinedFn,
                                 ArrayRef<llvm::Value *> CapturedVars,
                                 const Expr *IfCond);
 
   /// Emits a critical region.
   /// \param CriticalName Name of the critical region.
   /// \param CriticalOpGen Generator for the statement associated with the given
   /// critical region.
   /// \param Hint Value of the 'hint' clause (optional).
public:
   /// \param Shareds Context with the list of shared variables from the \p
   /// TaskFunction.
   /// \param IfCond Not a nullptr if 'if' clause was specified, nullptr
   /// otherwise.
   /// \param Data Additional data for task generation like tiednsee, final
   /// state, list of privates etc.
   virtual void emitTaskCall(CodeGenFunction &CGF, SourceLocation Loc,
                             const OMPExecutableDirective &D,
-                            llvm::Value *TaskFunction, QualType SharedsTy,
+                            llvm::Function *TaskFunction, QualType SharedsTy,
                             Address Shareds, const Expr *IfCond,
                             const OMPTaskDataTy &Data);
 
   /// Emit task region for the taskloop directive. The taskloop region is
   /// emitted in several steps:
   /// 1. Emit a call to kmp_task_t *__kmpc_omp_task_alloc(ident_t *, kmp_int32
   /// gtid, kmp_int32 flags, size_t sizeof_kmp_task_t, size_t sizeof_shareds,
   /// kmp_routine_entry_t *task_entry). Here task_entry is a pointer to the
public:
   /// /*part_id*/, captured_struct */*__context*/);
   /// \param SharedsTy A type which contains references the shared variables.
   /// \param Shareds Context with the list of shared variables from the \p
   /// TaskFunction.
   /// \param IfCond Not a nullptr if 'if' clause was specified, nullptr
   /// otherwise.
   /// \param Data Additional data for task generation like tiednsee, final
   /// state, list of privates etc.
-  virtual void emitTaskLoopCall(
-      CodeGenFunction &CGF, SourceLocation Loc, const OMPLoopDirective &D,
-      llvm::Value *TaskFunction, QualType SharedsTy, Address Shareds,
+  virtual void emitTaskLoopCall(CodeGenFunction &CGF, SourceLocation Loc,
+                                const OMPLoopDirective &D,
+                                llvm::Function *TaskFunction,
+                                QualType SharedsTy, Address Shareds,
                                 const Expr *IfCond, const OMPTaskDataTy &Data);
 
   /// Emit code for the directive that does not require outlining.
   ///
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
   /// \param HasCancel true if region has inner cancel directive, false
   /// otherwise.
   virtual void emitInlinedDirective(CodeGenFunction &CGF,
                                     OpenMPDirectiveKind InnermostKind,
                                     const RegionCodeGenTy &CodeGen,
                                     bool HasCancel = false);
 
   /// Emits reduction function.
   /// \param ArgsType Array type containing pointers to reduction variables.
   /// \param Privates List of private copies for original reduction arguments.
   /// \param LHSExprs List of LHS in \a ReductionOps reduction operations.
   /// \param RHSExprs List of RHS in \a ReductionOps reduction operations.
   /// \param ReductionOps List of reduction operations in form 'LHS binop RHS'
   /// or 'operator binop(LHS, RHS)'.
-  llvm::Value *emitReductionFunction(CodeGenModule &CGM, SourceLocation Loc,
+  llvm::Function *emitReductionFunction(CodeGenModule &CGM, SourceLocation Loc,
                                         llvm::Type *ArgsType,
                                         ArrayRef<const Expr *> Privates,
                                         ArrayRef<const Expr *> LHSExprs,
                                         ArrayRef<const Expr *> RHSExprs,
                                         ArrayRef<const Expr *> ReductionOps);
 
   /// Emits single reduction combiner
   void emitSingleReductionCombiner(CodeGenFunction &CGF,
                                    const Expr *ReductionOp,
                                    const Expr *PrivateRef,
                                    const DeclRefExpr *LHS,
                                    const DeclRefExpr *RHS);
 
public:
   /// \param OutlinedFn Host version of the code to be offloaded.
   /// \param OutlinedFnID ID of host version of the code to be offloaded.
   /// \param IfCond Expression evaluated in if clause associated with the target
   /// directive, or null if no if clause is used.
   /// \param Device Expression evaluated in device clause associated with the
   /// target directive, or null if no device clause is used.
   virtual void emitTargetCall(CodeGenFunction &CGF,
                               const OMPExecutableDirective &D,
-                              llvm::Value *OutlinedFn,
+                              llvm::Function *OutlinedFn,
                               llvm::Value *OutlinedFnID, const Expr *IfCond,
                               const Expr *Device);
 
   /// Emit the target regions enclosed in \a GD function definition or
   /// the function itself in case it is a valid device function. Returns true if
   /// \a GD was dealt with successfully.
   /// \param GD Function to scan.
   virtual bool emitTargetFunctions(GlobalDecl GD);
public:
   /// CapturedStruct.
   /// \param OutlinedFn Outlined function to be run by team masters. Type of
   /// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
   /// \param CapturedVars A pointer to the record with the references to
   /// variables used in \a OutlinedFn function.
   ///
   virtual void emitTeamsCall(CodeGenFunction &CGF,
                              const OMPExecutableDirective &D,
-                             SourceLocation Loc, llvm::Value *OutlinedFn,
+                             SourceLocation Loc, llvm::Function *OutlinedFn,
                              ArrayRef<llvm::Value *> CapturedVars);
 
   /// Emits call to void __kmpc_push_num_teams(ident_t *loc, kmp_int32
   /// global_tid, kmp_int32 num_teams, kmp_int32 thread_limit) to generate code
   /// for num_teams clause.
   /// \param NumTeams An integer expression of teams.
   /// \param ThreadLimit An integer expression of threads.
   virtual void emitNumTeamsClause(CodeGenFunction &CGF, const Expr *NumTeams,
public:
   virtual void getDefaultScheduleAndChunk(CodeGenFunction &CGF,
       const OMPLoopDirective &S, OpenMPScheduleClauseKind &ScheduleKind,
       const Expr *&ChunkExpr) const {}
 
   /// Emits call of the outlined function with the provided arguments,
   /// translating these arguments to correct target-specific arguments.
   virtual void
   emitOutlinedFunctionCall(CodeGenFunction &CGF, SourceLocation Loc,
-                           llvm::Value *OutlinedFn,
+                           llvm::FunctionCallee OutlinedFn,
                            ArrayRef<llvm::Value *> Args = llvm::None) const;
 
   /// Emits OpenMP-specific function prolog.
   /// Required for device constructs.
   virtual void emitFunctionProlog(CodeGenFunction &CGF, const Decl *D) {}
 
   /// Gets the OpenMP-specific address of the local variable.
   virtual Address getAddressOfLocalVariable(CodeGenFunction &CGF,
public:
   /// Emits outlined function for the specified OpenMP parallel directive
   /// \a D. This outlined function has type void(*)(kmp_int32 *ThreadID,
   /// kmp_int32 BoundID, struct context_vars*).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
-  llvm::Value *
+  llvm::Function *
   emitParallelOutlinedFunction(const OMPExecutableDirective &D,
                                const VarDecl *ThreadIDVar,
                                OpenMPDirectiveKind InnermostKind,
                                const RegionCodeGenTy &CodeGen) override;
 
   /// Emits outlined function for the specified OpenMP teams directive
   /// \a D. This outlined function has type void(*)(kmp_int32 *ThreadID,
   /// kmp_int32 BoundID, struct context_vars*).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
-  llvm::Value *
+  llvm::Function *
   emitTeamsOutlinedFunction(const OMPExecutableDirective &D,
                             const VarDecl *ThreadIDVar,
                             OpenMPDirectiveKind InnermostKind,
                             const RegionCodeGenTy &CodeGen) override;
 
   /// Emits outlined function for the OpenMP task directive \a D. This
   /// outlined function has type void(*)(kmp_int32 ThreadID, struct task_t*
   /// TaskT).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param PartIDVar Variable for partition id in the current OpenMP untied
   /// task region.
   /// \param TaskTVar Variable for task_t argument.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
   /// \param Tied true if task is generated for tied task, false otherwise.
   /// \param NumberOfParts Number of parts in untied task. Ignored for tied
   /// tasks.
   ///
-  llvm::Value *emitTaskOutlinedFunction(
+  llvm::Function *emitTaskOutlinedFunction(
       const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
       const VarDecl *PartIDVar, const VarDecl *TaskTVar,
       OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen,
       bool Tied, unsigned &NumberOfParts) override;
 
   /// Emits code for parallel or serial call of the \a OutlinedFn with
   /// variables captured in a record which address is stored in \a
   /// CapturedStruct.
   /// \param OutlinedFn Outlined function to be run in parallel threads. Type of
   /// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
   /// \param CapturedVars A pointer to the record with the references to
   /// variables used in \a OutlinedFn function.
   /// \param IfCond Condition in the associated 'if' clause, if it was
   /// specified, nullptr otherwise.
   ///
   void emitParallelCall(CodeGenFunction &CGF, SourceLocation Loc,
-                        llvm::Value *OutlinedFn,
+                        llvm::Function *OutlinedFn,
                         ArrayRef<llvm::Value *> CapturedVars,
                         const Expr *IfCond) override;
 
   /// Emits a critical region.
   /// \param CriticalName Name of the critical region.
   /// \param CriticalOpGen Generator for the statement associated with the given
   /// critical region.
   /// \param Hint Value of the 'hint' clause (optional).
public:
   /// \param SharedsTy A type which contains references the shared variables.
   /// \param Shareds Context with the list of shared variables from the \p
   /// TaskFunction.
   /// \param IfCond Not a nullptr if 'if' clause was specified, nullptr
   /// otherwise.
   /// \param Data Additional data for task generation like tiednsee, final
   /// state, list of privates etc.
   void emitTaskCall(CodeGenFunction &CGF, SourceLocation Loc,
-                    const OMPExecutableDirective &D, llvm::Value *TaskFunction,
-                    QualType SharedsTy, Address Shareds, const Expr *IfCond,
+                    const OMPExecutableDirective &D,
+                    llvm::Function *TaskFunction, QualType SharedsTy,
+                    Address Shareds, const Expr *IfCond,
                     const OMPTaskDataTy &Data) override;
 
   /// Emit task region for the taskloop directive. The taskloop region is
   /// emitted in several steps:
   /// 1. Emit a call to kmp_task_t *__kmpc_omp_task_alloc(ident_t *, kmp_int32
   /// gtid, kmp_int32 flags, size_t sizeof_kmp_task_t, size_t sizeof_shareds,
   /// kmp_routine_entry_t *task_entry). Here task_entry is a pointer to the
   /// function:
public:
   /// \param SharedsTy A type which contains references the shared variables.
   /// \param Shareds Context with the list of shared variables from the \p
   /// TaskFunction.
   /// \param IfCond Not a nullptr if 'if' clause was specified, nullptr
   /// otherwise.
   /// \param Data Additional data for task generation like tiednsee, final
   /// state, list of privates etc.
   void emitTaskLoopCall(CodeGenFunction &CGF, SourceLocation Loc,
-                        const OMPLoopDirective &D, llvm::Value *TaskFunction,
+                        const OMPLoopDirective &D, llvm::Function *TaskFunction,
                         QualType SharedsTy, Address Shareds, const Expr *IfCond,
                         const OMPTaskDataTy &Data) override;
 
   /// Emit a code for reduction clause. Next code should be emitted for
   /// reduction:
   /// \code
   ///
   /// static kmp_critical_name lock = { 0 };
public:
   /// \param D Directive to emit.
   /// \param OutlinedFn Host version of the code to be offloaded.
   /// \param OutlinedFnID ID of host version of the code to be offloaded.
   /// \param IfCond Expression evaluated in if clause associated with the target
   /// directive, or null if no if clause is used.
   /// \param Device Expression evaluated in device clause associated with the
   /// target directive, or null if no device clause is used.
   void emitTargetCall(CodeGenFunction &CGF, const OMPExecutableDirective &D,
-                      llvm::Value *OutlinedFn, llvm::Value *OutlinedFnID,
+                      llvm::Function *OutlinedFn, llvm::Value *OutlinedFnID,
                       const Expr *IfCond, const Expr *Device) override;
 
   /// Emit the target regions enclosed in \a GD function definition or
   /// the function itself in case it is a valid device function. Returns true if
   /// \a GD was dealt with successfully.
   /// \param GD Function to scan.
   bool emitTargetFunctions(GlobalDecl GD) override;
 
public:
   /// variables captured in a record which address is stored in \a
   /// CapturedStruct.
   /// \param OutlinedFn Outlined function to be run by team masters. Type of
   /// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
   /// \param CapturedVars A pointer to the record with the references to
   /// variables used in \a OutlinedFn function.
   ///
   void emitTeamsCall(CodeGenFunction &CGF, const OMPExecutableDirective &D,
-                     SourceLocation Loc, llvm::Value *OutlinedFn,
+                     SourceLocation Loc, llvm::Function *OutlinedFn,
                      ArrayRef<llvm::Value *> CapturedVars) override;
 
   /// Emits call to void __kmpc_push_num_teams(ident_t *loc, kmp_int32
   /// global_tid, kmp_int32 num_teams, kmp_int32 thread_limit) to generate code
   /// for num_teams clause.
   /// \param NumTeams An integer expression of teams.
   /// \param ThreadLimit An integer expression of threads.
   void emitNumTeamsClause(CodeGenFunction &CGF, const Expr *NumTeams,

lib/CodeGen/CGOpenMPRuntime.cpp

 CGOpenMPRuntime::getUserDefinedReduction(const OMPDeclareReductionDecl *D) {
   auto I = UDRMap.find(D);
   if (I != UDRMap.end())
     return I->second;
   emitUserDefinedReduction(/*CGF=*/nullptr, D);
   return UDRMap.lookup(D);
 }
 
-static llvm::Value *emitParallelOrTeamsOutlinedFunction(
+static llvm::Function *emitParallelOrTeamsOutlinedFunction(
     CodeGenModule &CGM, const OMPExecutableDirective &D, const CapturedStmt *CS,
     const VarDecl *ThreadIDVar, OpenMPDirectiveKind InnermostKind,
     const StringRef OutlinedHelperName, const RegionCodeGenTy &CodeGen) {
   assert(ThreadIDVar->getType()->isPointerType() &&
          "thread id variable must be of type kmp_int32 *");
   CodeGenFunction CGF(CGM, true);
   bool HasCancel = false;
   if (const auto *OPD = dyn_cast<OMPParallelDirective>(&D))
else if (const auto *OPFD =
                dyn_cast<OMPTargetTeamsDistributeParallelForDirective>(&D))
     HasCancel = OPFD->hasCancel();
   CGOpenMPOutlinedRegionInfo CGInfo(*CS, ThreadIDVar, CodeGen, InnermostKind,
                                     HasCancel, OutlinedHelperName);
   CodeGenFunction::CGCapturedStmtRAII CapInfoRAII(CGF, &CGInfo);
   return CGF.GenerateOpenMPCapturedStmtFunction(*CS);
 }
 
-llvm::Value *CGOpenMPRuntime::emitParallelOutlinedFunction(
+llvm::Function *CGOpenMPRuntime::emitParallelOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) {
   const CapturedStmt *CS = D.getCapturedStmt(OMPD_parallel);
   return emitParallelOrTeamsOutlinedFunction(
       CGM, D, CS, ThreadIDVar, InnermostKind, getOutlinedHelperName(), CodeGen);
 }
 
-llvm::Value *CGOpenMPRuntime::emitTeamsOutlinedFunction(
+llvm::Function *CGOpenMPRuntime::emitTeamsOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) {
   const CapturedStmt *CS = D.getCapturedStmt(OMPD_teams);
   return emitParallelOrTeamsOutlinedFunction(
       CGM, D, CS, ThreadIDVar, InnermostKind, getOutlinedHelperName(), CodeGen);
 }
 
-llvm::Value *CGOpenMPRuntime::emitTaskOutlinedFunction(
+llvm::Function *CGOpenMPRuntime::emitTaskOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     const VarDecl *PartIDVar, const VarDecl *TaskTVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen,
     bool Tied, unsigned &NumberOfParts) {
   auto &&UntiedCodeGen = [this, &D, TaskTVar](CodeGenFunction &CGF,
                                               PrePostActionTy &) {
     llvm::Value *ThreadID = getThreadID(CGF, D.getBeginLoc());
     llvm::Value *UpLoc = emitUpdateLocation(CGF, D.getBeginLoc());
const OpenMPDirectiveKind Region =
                                                       : OMPD_task;
   const CapturedStmt *CS = D.getCapturedStmt(Region);
   const auto *TD = dyn_cast<OMPTaskDirective>(&D);
   CodeGenFunction CGF(CGM, true);
   CGOpenMPTaskOutlinedRegionInfo CGInfo(*CS, ThreadIDVar, CodeGen,
                                         InnermostKind,
                                         TD ? TD->hasCancel() : false, Action);
   CodeGenFunction::CGCapturedStmtRAII CapInfoRAII(CGF, &CGInfo);
-  llvm::Value *Res = CGF.GenerateCapturedStmtFunction(*CS);
+  llvm::Function *Res = CGF.GenerateCapturedStmtFunction(*CS);
   if (!Tied)
     NumberOfParts = Action.getNumberOfParts();
   return Res;
 }
 
 static void buildStructValue(ConstantStructBuilder &Fields, CodeGenModule &CGM,
                              const RecordDecl *RD, const CGRecordLayout &RL,
                              ArrayRef<llvm::Constant *> Data) {
if (!Kmpc_MicroTy) {
     // Build void (*kmpc_micro)(kmp_int32 *global_tid, kmp_int32 *bound_tid,...)
     llvm::Type *MicroParams[] = {llvm::PointerType::getUnqual(CGM.Int32Ty),
                                  llvm::PointerType::getUnqual(CGM.Int32Ty)};
     Kmpc_MicroTy = llvm::FunctionType::get(CGM.VoidTy, MicroParams, true);
   }
   return llvm::PointerType::getUnqual(Kmpc_MicroTy);
 }
 
-llvm::Constant *
-CGOpenMPRuntime::createRuntimeFunction(unsigned Function) {
-  llvm::Constant *RTLFn = nullptr;
+llvm::FunctionCallee CGOpenMPRuntime::createRuntimeFunction(unsigned Function) {
+  llvm::FunctionCallee RTLFn = nullptr;
   switch (static_cast<OpenMPRTLFunction>(Function)) {
   case OMPRTL__kmpc_fork_call: {
     // Build void __kmpc_fork_call(ident_t *loc, kmp_int32 argc, kmpc_micro
     // microtask, ...);
     llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty,
                                 getKmpc_MicroPointerTy()};
     auto *FnTy =
         llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ true);
     RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_fork_call");
-    if (auto *F = dyn_cast<llvm::Function>(RTLFn)) {
+    if (auto *F = dyn_cast<llvm::Function>(RTLFn.getCallee())) {
       if (!F->hasMetadata(llvm::LLVMContext::MD_callback)) {
         llvm::LLVMContext &Ctx = F->getContext();
         llvm::MDBuilder MDB(Ctx);
         // Annotate the callback behavior of the __kmpc_fork_call:
         //  - The callback callee is argument number 2 (microtask).
         //  - The first two arguments of the callback callee are unknown (-1).
         //  - All variadic arguments to the __kmpc_fork_call are passed to the
         //    callback callee.
llvm::FunctionCallee CGOpenMPRuntime::createRuntimeFunction(unsigned Function) {
   case OMPRTL__kmpc_fork_teams: {
     // Build void __kmpc_fork_teams(ident_t *loc, kmp_int32 argc, kmpc_micro
     // microtask, ...);
     llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty,
                                 getKmpc_MicroPointerTy()};
     auto *FnTy =
         llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ true);
     RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_fork_teams");
-    if (auto *F = dyn_cast<llvm::Function>(RTLFn)) {
+    if (auto *F = dyn_cast<llvm::Function>(RTLFn.getCallee())) {
       if (!F->hasMetadata(llvm::LLVMContext::MD_callback)) {
         llvm::LLVMContext &Ctx = F->getContext();
         llvm::MDBuilder MDB(Ctx);
         // Annotate the callback behavior of the __kmpc_fork_teams:
         //  - The callback callee is argument number 2 (microtask).
         //  - The first two arguments of the callback callee are unknown (-1).
         //  - All variadic arguments to the __kmpc_fork_teams are passed to the
         //    callback callee.
case OMPRTL__tgt_target_data_update_nowait: {
     RTLFn = CGM.CreateRuntimeFunction(FnTy, "__tgt_target_data_update_nowait");
     break;
   }
   }
   assert(RTLFn && "Unable to find OpenMP runtime function");
   return RTLFn;
 }
 
-llvm::Constant *CGOpenMPRuntime::createForStaticInitFunction(unsigned IVSize,
-                                                             bool IVSigned) {
+llvm::FunctionCallee
+CGOpenMPRuntime::createForStaticInitFunction(unsigned IVSize, bool IVSigned) {
   assert((IVSize == 32 || IVSize == 64) &&
          "IV size is not compatible with the omp runtime");
   StringRef Name = IVSize == 32 ? (IVSigned ? "__kmpc_for_static_init_4"
                                             : "__kmpc_for_static_init_4u")
                                 : (IVSigned ? "__kmpc_for_static_init_8"
                                             : "__kmpc_for_static_init_8u");
   llvm::Type *ITy = IVSize == 32 ? CGM.Int32Ty : CGM.Int64Ty;
   auto *PtrTy = llvm::PointerType::getUnqual(ITy);
   llvm::Type *TypeParams[] = {
     getIdentTyPointerTy(),                     // loc
     CGM.Int32Ty,                               // tid
     CGM.Int32Ty,                               // schedtype
     llvm::PointerType::getUnqual(CGM.Int32Ty), // p_lastiter
     PtrTy,                                     // p_lower
     PtrTy,                                     // p_upper
     PtrTy,                                     // p_stride
     ITy,                                       // incr
     ITy                                        // chunk
   };
   auto *FnTy =
       llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
   return CGM.CreateRuntimeFunction(FnTy, Name);
 }
 
-llvm::Constant *CGOpenMPRuntime::createDispatchInitFunction(unsigned IVSize,
-                                                            bool IVSigned) {
+llvm::FunctionCallee
+CGOpenMPRuntime::createDispatchInitFunction(unsigned IVSize, bool IVSigned) {
   assert((IVSize == 32 || IVSize == 64) &&
          "IV size is not compatible with the omp runtime");
   StringRef Name =
       IVSize == 32
           ? (IVSigned ? "__kmpc_dispatch_init_4" : "__kmpc_dispatch_init_4u")
           : (IVSigned ? "__kmpc_dispatch_init_8" : "__kmpc_dispatch_init_8u");
   llvm::Type *ITy = IVSize == 32 ? CGM.Int32Ty : CGM.Int64Ty;
   llvm::Type *TypeParams[] = { getIdentTyPointerTy(), // loc
                                CGM.Int32Ty,           // tid
                                CGM.Int32Ty,           // schedtype
                                ITy,                   // lower
                                ITy,                   // upper
                                ITy,                   // stride
                                ITy                    // chunk
   };
   auto *FnTy =
       llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
   return CGM.CreateRuntimeFunction(FnTy, Name);
 }
 
-llvm::Constant *CGOpenMPRuntime::createDispatchFiniFunction(unsigned IVSize,
-                                                            bool IVSigned) {
+llvm::FunctionCallee
+CGOpenMPRuntime::createDispatchFiniFunction(unsigned IVSize, bool IVSigned) {
   assert((IVSize == 32 || IVSize == 64) &&
          "IV size is not compatible with the omp runtime");
   StringRef Name =
       IVSize == 32
           ? (IVSigned ? "__kmpc_dispatch_fini_4" : "__kmpc_dispatch_fini_4u")
           : (IVSigned ? "__kmpc_dispatch_fini_8" : "__kmpc_dispatch_fini_8u");
   llvm::Type *TypeParams[] = {
       getIdentTyPointerTy(), // loc
       CGM.Int32Ty,           // tid
   };
   auto *FnTy =
       llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg=*/false);
   return CGM.CreateRuntimeFunction(FnTy, Name);
 }
 
-llvm::Constant *CGOpenMPRuntime::createDispatchNextFunction(unsigned IVSize,
-                                                            bool IVSigned) {
+llvm::FunctionCallee
+CGOpenMPRuntime::createDispatchNextFunction(unsigned IVSize, bool IVSigned) {
   assert((IVSize == 32 || IVSize == 64) &&
          "IV size is not compatible with the omp runtime");
   StringRef Name =
       IVSize == 32
           ? (IVSigned ? "__kmpc_dispatch_next_4" : "__kmpc_dispatch_next_4u")
           : (IVSigned ? "__kmpc_dispatch_next_8" : "__kmpc_dispatch_next_8u");
   llvm::Type *ITy = IVSize == 32 ? CGM.Int32Ty : CGM.Int64Ty;
   auto *PtrTy = llvm::PointerType::getUnqual(ITy);
void CGOpenMPRuntime::emitOMPIfClause(CodeGenFunction &CGF, const Expr *Cond,
   // There is no need to emit line number for unconditional branch.
   (void)ApplyDebugLocation::CreateEmpty(CGF);
   CGF.EmitBranch(ContBlock);
   // Emit the continuation block for code after the if.
   CGF.EmitBlock(ContBlock, /*IsFinished=*/true);
 }
 
 void CGOpenMPRuntime::emitParallelCall(CodeGenFunction &CGF, SourceLocation Loc,
-                                       llvm::Value *OutlinedFn,
+                                       llvm::Function *OutlinedFn,
                                        ArrayRef<llvm::Value *> CapturedVars,
                                        const Expr *IfCond) {
   if (!CGF.HaveInsertPoint())
     return;
   llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc);
   auto &&ThenGen = [OutlinedFn, CapturedVars, RTLoc](CodeGenFunction &CGF,
                                                      PrePostActionTy &) {
     // Build call __kmpc_fork_call(loc, n, microtask, var1, .., varn);
     CGOpenMPRuntime &RT = CGF.CGM.getOpenMPRuntime();
     llvm::Value *Args[] = {
         RTLoc,
         CGF.Builder.getInt32(CapturedVars.size()), // Number of captured vars
         CGF.Builder.CreateBitCast(OutlinedFn, RT.getKmpc_MicroPointerTy())};
     llvm::SmallVector<llvm::Value *, 16> RealArgs;
     RealArgs.append(std::begin(Args), std::end(Args));
     RealArgs.append(CapturedVars.begin(), CapturedVars.end());
 
-    llvm::Value *RTLFn = RT.createRuntimeFunction(OMPRTL__kmpc_fork_call);
+    llvm::FunctionCallee RTLFn =
+        RT.createRuntimeFunction(OMPRTL__kmpc_fork_call);
     CGF.EmitRuntimeCall(RTLFn, RealArgs);
   };
   auto &&ElseGen = [OutlinedFn, CapturedVars, RTLoc, Loc](CodeGenFunction &CGF,
                                                           PrePostActionTy &) {
     CGOpenMPRuntime &RT = CGF.CGM.getOpenMPRuntime();
     llvm::Value *ThreadID = RT.getThreadID(CGF, Loc);
     // Build calls:
     // __kmpc_serialized_parallel(&Loc, GTid);
llvm::Value *CGOpenMPRuntime::getCriticalRegionLock(StringRef CriticalName) {
   std::string Prefix = Twine("gomp_critical_user_", CriticalName).str();
   std::string Name = getName({Prefix, "var"});
   return getOrCreateInternalVariable(KmpCriticalNameTy, Name);
 }
 
 namespace {
 /// Common pre(post)-action for different OpenMP constructs.
 class CommonActionTy final : public PrePostActionTy {
-  llvm::Value *EnterCallee;
+  llvm::FunctionCallee EnterCallee;
   ArrayRef<llvm::Value *> EnterArgs;
-  llvm::Value *ExitCallee;
+  llvm::FunctionCallee ExitCallee;
   ArrayRef<llvm::Value *> ExitArgs;
   bool Conditional;
   llvm::BasicBlock *ContBlock = nullptr;
 
 public:
-  CommonActionTy(llvm::Value *EnterCallee, ArrayRef<llvm::Value *> EnterArgs,
-                 llvm::Value *ExitCallee, ArrayRef<llvm::Value *> ExitArgs,
-                 bool Conditional = false)
+  CommonActionTy(llvm::FunctionCallee EnterCallee,
+                 ArrayRef<llvm::Value *> EnterArgs,
+                 llvm::FunctionCallee ExitCallee,
+                 ArrayRef<llvm::Value *> ExitArgs, bool Conditional = false)
       : EnterCallee(EnterCallee), EnterArgs(EnterArgs), ExitCallee(ExitCallee),
         ExitArgs(ExitArgs), Conditional(Conditional) {}
   void Enter(CodeGenFunction &CGF) override {
     llvm::Value *EnterRes = CGF.EmitRuntimeCall(EnterCallee, EnterArgs);
     if (Conditional) {
       llvm::Value *CallBool = CGF.Builder.CreateIsNotNull(EnterRes);
       auto *ThenBlock = CGF.createBasicBlock("omp_if.then");
       ContBlock = CGF.createBasicBlock("omp_if.end");
llvm::Value *Args[] = {
       CGF.Builder.getIntN(IVSize, 1),                   // Stride
       Chunk                                             // Chunk
   };
   CGF.EmitRuntimeCall(createDispatchInitFunction(IVSize, IVSigned), Args);
 }
 
 static void emitForStaticInitCall(
     CodeGenFunction &CGF, llvm::Value *UpdateLocation, llvm::Value *ThreadId,
-    llvm::Constant *ForStaticInitFunction, OpenMPSchedType Schedule,
+    llvm::FunctionCallee ForStaticInitFunction, OpenMPSchedType Schedule,
     OpenMPScheduleClauseModifier M1, OpenMPScheduleClauseModifier M2,
     const CGOpenMPRuntime::StaticRTInput &Values) {
   if (!CGF.HaveInsertPoint())
     return;
 
   assert(!Values.Ordered);
   assert(Schedule == OMP_sch_static || Schedule == OMP_sch_static_chunked ||
          Schedule == OMP_sch_static_balanced_chunked ||
OpenMPSchedType ScheduleNum = getRuntimeSchedule(
       ScheduleKind.Schedule, Values.Chunk != nullptr, Values.Ordered);
   assert(isOpenMPWorksharingDirective(DKind) &&
          "Expected loop-based or sections-based directive.");
   llvm::Value *UpdatedLocation = emitUpdateLocation(CGF, Loc,
                                              isOpenMPLoopDirective(DKind)
                                                  ? OMP_IDENT_WORK_LOOP
                                                  : OMP_IDENT_WORK_SECTIONS);
   llvm::Value *ThreadId = getThreadID(CGF, Loc);
-  llvm::Constant *StaticInitFunction =
+  llvm::FunctionCallee StaticInitFunction =
       createForStaticInitFunction(Values.IVSize, Values.IVSigned);
   emitForStaticInitCall(CGF, UpdatedLocation, ThreadId, StaticInitFunction,
                         ScheduleNum, ScheduleKind.M1, ScheduleKind.M2, Values);
 }
 
 void CGOpenMPRuntime::emitDistributeStaticInit(
     CodeGenFunction &CGF, SourceLocation Loc,
     OpenMPDistScheduleClauseKind SchedKind,
     const CGOpenMPRuntime::StaticRTInput &Values) {
   OpenMPSchedType ScheduleNum =
       getRuntimeSchedule(SchedKind, Values.Chunk != nullptr);
   llvm::Value *UpdatedLocation =
       emitUpdateLocation(CGF, Loc, OMP_IDENT_WORK_DISTRIBUTE);
   llvm::Value *ThreadId = getThreadID(CGF, Loc);
-  llvm::Constant *StaticInitFunction =
+  llvm::FunctionCallee StaticInitFunction =
       createForStaticInitFunction(Values.IVSize, Values.IVSigned);
   emitForStaticInitCall(CGF, UpdatedLocation, ThreadId, StaticInitFunction,
                         ScheduleNum, OMPC_SCHEDULE_MODIFIER_unknown,
                         OMPC_SCHEDULE_MODIFIER_unknown, Values);
 }
 
 void CGOpenMPRuntime::emitForStaticFinish(CodeGenFunction &CGF,
                                           SourceLocation Loc,

 /// kmp_int32 .omp_task_entry.(kmp_int32 gtid, kmp_task_t *tt) {
 ///   TaskFunction(gtid, tt->part_id, &tt->privates, task_privates_map, tt,
 ///   For taskloops:
 ///   tt->task_data.lb, tt->task_data.ub, tt->task_data.st, tt->task_data.liter,
 ///   tt->reductions, tt->shareds);
 ///   return 0;
 /// }
 /// \endcode
-static llvm::Value *
+static llvm::Function *
 emitProxyTaskFunction(CodeGenModule &CGM, SourceLocation Loc,
                       OpenMPDirectiveKind Kind, QualType KmpInt32Ty,
                       QualType KmpTaskTWithPrivatesPtrQTy,
                       QualType KmpTaskTWithPrivatesQTy, QualType KmpTaskTQTy,
-                      QualType SharedsPtrTy, llvm::Value *TaskFunction,
+                      QualType SharedsPtrTy, llvm::Function *TaskFunction,
                       llvm::Value *TaskPrivatesMap) {
   ASTContext &C = CGM.getContext();
   FunctionArgList Args;
   ImplicitParamDecl GtidArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, KmpInt32Ty,
                             ImplicitParamDecl::Other);
   ImplicitParamDecl TaskTypeArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr,
                                 KmpTaskTWithPrivatesPtrQTy.withRestrict(),
                                 ImplicitParamDecl::Other);
if (NeedsCleanup)
       break;
   }
   return NeedsCleanup;
 }
 
 CGOpenMPRuntime::TaskResultTy
 CGOpenMPRuntime::emitTaskInit(CodeGenFunction &CGF, SourceLocation Loc,
                               const OMPExecutableDirective &D,
-                              llvm::Value *TaskFunction, QualType SharedsTy,
+                              llvm::Function *TaskFunction, QualType SharedsTy,
                               Address Shareds, const OMPTaskDataTy &Data) {
   ASTContext &C = CGM.getContext();
   llvm::SmallVector<PrivateDataTy, 4> Privates;
   // Aggregate privates and sort them by the alignment.
   auto I = Data.PrivateCopies.begin();
   for (const Expr *E : Data.PrivateVars) {
     const auto *VD = cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl());
     Privates.emplace_back(
llvm::Type *KmpTaskTWithPrivatesPtrTy =
       KmpTaskTWithPrivatesTy->getPointerTo();
   llvm::Value *KmpTaskTWithPrivatesTySize =
       CGF.getTypeSize(KmpTaskTWithPrivatesQTy);
   QualType SharedsPtrTy = C.getPointerType(SharedsTy);
 
   // Emit initial values for private copies (if any).
   llvm::Value *TaskPrivatesMap = nullptr;
   llvm::Type *TaskPrivatesMapTy =
-      std::next(cast<llvm::Function>(TaskFunction)->arg_begin(), 3)->getType();
+      std::next(TaskFunction->arg_begin(), 3)->getType();
   if (!Privates.empty()) {
     auto FI = std::next(KmpTaskTWithPrivatesQTyRD->field_begin());
     TaskPrivatesMap = emitTaskPrivateMappingFunction(
         CGM, Loc, Data.PrivateVars, Data.FirstprivateVars, Data.LastprivateVars,
         FI->getType(), Privates);
     TaskPrivatesMap = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(
         TaskPrivatesMap, TaskPrivatesMapTy);
   } else {
     TaskPrivatesMap = llvm::ConstantPointerNull::get(
         cast<llvm::PointerType>(TaskPrivatesMapTy));
   }
   // Build a proxy function kmp_int32 .omp_task_entry.(kmp_int32 gtid,
   // kmp_task_t *tt);
-  llvm::Value *TaskEntry = emitProxyTaskFunction(
+  llvm::Function *TaskEntry = emitProxyTaskFunction(
       CGM, Loc, D.getDirectiveKind(), KmpInt32Ty, KmpTaskTWithPrivatesPtrQTy,
       KmpTaskTWithPrivatesQTy, KmpTaskTQTy, SharedsPtrTy, TaskFunction,
       TaskPrivatesMap);
 
   // Build call kmp_task_t * __kmpc_omp_task_alloc(ident_t *, kmp_int32 gtid,
   // kmp_int32 flags, size_t sizeof_kmp_task_t, size_t sizeof_shareds,
   // kmp_routine_entry_t *task_entry);
   // Task flags. Format is taken from
CGOpenMPRuntime::emitTaskInit(CodeGenFunction &CGF, SourceLocation Loc,
   Result.NewTaskNewTaskTTy = NewTaskNewTaskTTy;
   Result.TDBase = TDBase;
   Result.KmpTaskTQTyRD = KmpTaskTQTyRD;
   return Result;
 }
 
 void CGOpenMPRuntime::emitTaskCall(CodeGenFunction &CGF, SourceLocation Loc,
                                    const OMPExecutableDirective &D,
-                                   llvm::Value *TaskFunction,
+                                   llvm::Function *TaskFunction,
                                    QualType SharedsTy, Address Shareds,
                                    const Expr *IfCond,
                                    const OMPTaskDataTy &Data) {
   if (!CGF.HaveInsertPoint())
     return;
 
   TaskResultTy Result =
       emitTaskInit(CGF, Loc, D, TaskFunction, SharedsTy, Shareds, Data);
   llvm::Value *NewTask = Result.NewTask;
-  llvm::Value *TaskEntry = Result.TaskEntry;
+  llvm::Function *TaskEntry = Result.TaskEntry;
   llvm::Value *NewTaskNewTaskTTy = Result.NewTaskNewTaskTTy;
   LValue TDBase = Result.TDBase;
   const RecordDecl *KmpTaskTQTyRD = Result.KmpTaskTQTyRD;
   ASTContext &C = CGM.getContext();
   // Process list of dependences.
   Address DependenciesArray = Address::invalid();
   unsigned NumDependencies = Data.Dependences.size();
   if (NumDependencies) {
void CGOpenMPRuntime::emitTaskCall(CodeGenFunction &CGF, SourceLocation Loc,
   } else {
     RegionCodeGenTy ThenRCG(ThenCodeGen);
     ThenRCG(CGF);
   }
 }
 
 void CGOpenMPRuntime::emitTaskLoopCall(CodeGenFunction &CGF, SourceLocation Loc,
                                        const OMPLoopDirective &D,
-                                       llvm::Value *TaskFunction,
+                                       llvm::Function *TaskFunction,
                                        QualType SharedsTy, Address Shareds,
                                        const Expr *IfCond,
                                        const OMPTaskDataTy &Data) {
   if (!CGF.HaveInsertPoint())
     return;
   TaskResultTy Result =
       emitTaskInit(CGF, Loc, D, TaskFunction, SharedsTy, Shareds, Data);
   // NOTE: routine and part_id fields are initialized by __kmpc_omp_task_alloc()
if (const auto *OVE = dyn_cast<OpaqueValueExpr>(CE->getCallee()))
           RValue Func = RValue::get(Reduction.first);
           CodeGenFunction::OpaqueValueMapping Map(CGF, OVE, Func);
           CGF.EmitIgnoredExpr(ReductionOp);
           return;
         }
   CGF.EmitIgnoredExpr(ReductionOp);
 }
 
-llvm::Value *CGOpenMPRuntime::emitReductionFunction(
+llvm::Function *CGOpenMPRuntime::emitReductionFunction(
     CodeGenModule &CGM, SourceLocation Loc, llvm::Type *ArgsType,
     ArrayRef<const Expr *> Privates, ArrayRef<const Expr *> LHSExprs,
     ArrayRef<const Expr *> RHSExprs, ArrayRef<const Expr *> ReductionOps) {
   ASTContext &C = CGM.getContext();
 
   // void reduction_func(void *LHSArg, void *RHSArg);
   FunctionArgList Args;
   ImplicitParamDecl LHSArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.VoidPtrTy,
if ((*IPriv)->getType()->isVariablyModifiedType()) {
               .NumElts,
           CGF.SizeTy, /*isSigned=*/false);
       CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy),
                               Elem);
     }
   }
 
   // 2. Emit reduce_func().
-  llvm::Value *ReductionFn = emitReductionFunction(
+  llvm::Function *ReductionFn = emitReductionFunction(
       CGM, Loc, CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo(),
       Privates, LHSExprs, RHSExprs, ReductionOps);
 
   // 3. Create static kmp_critical_name lock = { 0 };
   std::string Name = getName({"reduction"});
   llvm::Value *Lock = getCriticalRegionLock(Name);
 
   // 4. Build res = __kmpc_reduce{_nowait}(<loc>, <gtid>, <n>, sizeof(RedList),
auto &&CodeGen = [LD, &Device, &SizeEmitter, this](CodeGenFunction &CGF,
     CGF.EmitRuntimeCall(
         createRuntimeFunction(OMPRTL__kmpc_push_target_tripcount), Args);
   };
   emitInlinedDirective(CGF, OMPD_unknown, CodeGen);
 }
 
 void CGOpenMPRuntime::emitTargetCall(CodeGenFunction &CGF,
                                      const OMPExecutableDirective &D,
-                                     llvm::Value *OutlinedFn,
+                                     llvm::Function *OutlinedFn,
                                      llvm::Value *OutlinedFnID,
                                      const Expr *IfCond, const Expr *Device) {
   if (!CGF.HaveInsertPoint())
     return;
 
   assert(OutlinedFn && "Invalid outlined function!");
 
   const bool RequiresOuterTask = D.hasClausesOfKind<OMPDependClause>();
llvm::Function *CGOpenMPRuntime::emitRegistrationFunction() {
   // entity that captures all the information about offloading in the current
   // compilation unit.
   return createOffloadingBinaryDescriptorRegistration();
 }
 
 void CGOpenMPRuntime::emitTeamsCall(CodeGenFunction &CGF,
                                     const OMPExecutableDirective &D,
                                     SourceLocation Loc,
-                                    llvm::Value *OutlinedFn,
+                                    llvm::Function *OutlinedFn,
                                     ArrayRef<llvm::Value *> CapturedVars) {
   if (!CGF.HaveInsertPoint())
     return;
 
   llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc);
   CodeGenFunction::RunCleanupsScope Scope(CGF);
 
   // Build call __kmpc_fork_teams(loc, n, microtask, var1, .., varn);
   llvm::Value *Args[] = {
       RTLoc,
       CGF.Builder.getInt32(CapturedVars.size()), // Number of captured vars
       CGF.Builder.CreateBitCast(OutlinedFn, getKmpc_MicroPointerTy())};
   llvm::SmallVector<llvm::Value *, 16> RealArgs;
   RealArgs.append(std::begin(Args), std::end(Args));
   RealArgs.append(CapturedVars.begin(), CapturedVars.end());
 
-  llvm::Value *RTLFn = createRuntimeFunction(OMPRTL__kmpc_fork_teams);
+  llvm::FunctionCallee RTLFn = createRuntimeFunction(OMPRTL__kmpc_fork_teams);
   CGF.EmitRuntimeCall(RTLFn, RealArgs);
 }
 
 void CGOpenMPRuntime::emitNumTeamsClause(CodeGenFunction &CGF,
                                          const Expr *NumTeams,
                                          const Expr *ThreadLimit,
                                          SourceLocation Loc) {
   if (!CGF.HaveInsertPoint())

 
 namespace {
 /// Cleanup action for doacross support.
 class DoacrossCleanupTy final : public EHScopeStack::Cleanup {
 public:
   static const int DoacrossFinArgs = 2;
 
 private:
-  llvm::Value *RTLFn;
+  llvm::FunctionCallee RTLFn;
   llvm::Value *Args[DoacrossFinArgs];
 
 public:
-  DoacrossCleanupTy(llvm::Value *RTLFn, ArrayRef<llvm::Value *> CallArgs)
+  DoacrossCleanupTy(llvm::FunctionCallee RTLFn,
+                    ArrayRef<llvm::Value *> CallArgs)
       : RTLFn(RTLFn) {
     assert(CallArgs.size() == DoacrossFinArgs);
     std::copy(CallArgs.begin(), CallArgs.end(), std::begin(Args));
   }
   void Emit(CodeGenFunction &CGF, Flags /*flags*/) override {
     if (!CGF.HaveInsertPoint())
       return;
     CGF.EmitRuntimeCall(RTLFn, Args);
llvm::Value *Args[] = {
       getThreadID(CGF, D.getBeginLoc()),
       llvm::ConstantInt::getSigned(CGM.Int32Ty, NumIterations.size()),
       CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(
           CGF.Builder
               .CreateConstArrayGEP(DimsAddr, 0, C.getTypeSizeInChars(KmpDimTy))
               .getPointer(),
           CGM.VoidPtrTy)};
 
-  llvm::Value *RTLFn = createRuntimeFunction(OMPRTL__kmpc_doacross_init);
+  llvm::FunctionCallee RTLFn =
+      createRuntimeFunction(OMPRTL__kmpc_doacross_init);
   CGF.EmitRuntimeCall(RTLFn, Args);
   llvm::Value *FiniArgs[DoacrossCleanupTy::DoacrossFinArgs] = {
       emitUpdateLocation(CGF, D.getEndLoc()), getThreadID(CGF, D.getEndLoc())};
-  llvm::Value *FiniRTLFn = createRuntimeFunction(OMPRTL__kmpc_doacross_fini);
+  llvm::FunctionCallee FiniRTLFn =
+      createRuntimeFunction(OMPRTL__kmpc_doacross_fini);
   CGF.EHStack.pushCleanup<DoacrossCleanupTy>(NormalAndEHCleanup, FiniRTLFn,
                                              llvm::makeArrayRef(FiniArgs));
 }
 
 void CGOpenMPRuntime::emitDoacrossOrdered(CodeGenFunction &CGF,
                                           const OMPDependClause *C) {
   QualType Int64Ty =
       CGM.getContext().getIntTypeForBitwidth(/*DestWidth=*/64, /*Signed=*/1);
void CGOpenMPRuntime::emitDoacrossOrdered(CodeGenFunction &CGF,
   }
   llvm::Value *Args[] = {
       emitUpdateLocation(CGF, C->getBeginLoc()),
       getThreadID(CGF, C->getBeginLoc()),
       CGF.Builder
           .CreateConstArrayGEP(CntAddr, 0,
                                CGM.getContext().getTypeSizeInChars(Int64Ty))
           .getPointer()};
-  llvm::Value *RTLFn;
+  llvm::FunctionCallee RTLFn;
   if (C->getDependencyKind() == OMPC_DEPEND_source) {
     RTLFn = createRuntimeFunction(OMPRTL__kmpc_doacross_post);
   } else {
     assert(C->getDependencyKind() == OMPC_DEPEND_sink);
     RTLFn = createRuntimeFunction(OMPRTL__kmpc_doacross_wait);
   }
   CGF.EmitRuntimeCall(RTLFn, Args);
 }
 
 void CGOpenMPRuntime::emitCall(CodeGenFunction &CGF, SourceLocation Loc,
-                               llvm::Value *Callee,
+                               llvm::FunctionCallee Callee,
                                ArrayRef<llvm::Value *> Args) const {
   assert(Loc.isValid() && "Outlined function call location must be valid.");
   auto DL = ApplyDebugLocation::CreateDefaultArtificial(CGF, Loc);
 
-  if (auto *Fn = dyn_cast<llvm::Function>(Callee)) {
+  if (auto *Fn = dyn_cast<llvm::Function>(Callee.getCallee())) {
     if (Fn->doesNotThrow()) {
       CGF.EmitNounwindRuntimeCall(Fn, Args);
       return;
     }
   }
   CGF.EmitRuntimeCall(Callee, Args);
 }
 
 void CGOpenMPRuntime::emitOutlinedFunctionCall(
-    CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *OutlinedFn,
+    CodeGenFunction &CGF, SourceLocation Loc, llvm::FunctionCallee OutlinedFn,
     ArrayRef<llvm::Value *> Args) const {
   emitCall(CGF, Loc, OutlinedFn, Args);
 }
 
 Address CGOpenMPRuntime::getParameterAddress(CodeGenFunction &CGF,
                                              const VarDecl *NativeParam,
                                              const VarDecl *TargetParam) const {
   return CGF.GetAddrOfLocalVar(NativeParam);
 }
 
 Address CGOpenMPRuntime::getAddressOfLocalVariable(CodeGenFunction &CGF,
                                                    const VarDecl *VD) {
   return Address::invalid();
 }
 
-llvm::Value *CGOpenMPSIMDRuntime::emitParallelOutlinedFunction(
+llvm::Function *CGOpenMPSIMDRuntime::emitParallelOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
-llvm::Value *CGOpenMPSIMDRuntime::emitTeamsOutlinedFunction(
+llvm::Function *CGOpenMPSIMDRuntime::emitTeamsOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
-llvm::Value *CGOpenMPSIMDRuntime::emitTaskOutlinedFunction(
+llvm::Function *CGOpenMPSIMDRuntime::emitTaskOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     const VarDecl *PartIDVar, const VarDecl *TaskTVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen,
     bool Tied, unsigned &NumberOfParts) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 void CGOpenMPSIMDRuntime::emitParallelCall(CodeGenFunction &CGF,
                                            SourceLocation Loc,
-                                           llvm::Value *OutlinedFn,
+                                           llvm::Function *OutlinedFn,
                                            ArrayRef<llvm::Value *> CapturedVars,
                                            const Expr *IfCond) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 void CGOpenMPSIMDRuntime::emitCriticalRegion(
     CodeGenFunction &CGF, StringRef CriticalName,
     const RegionCodeGenTy &CriticalOpGen, SourceLocation Loc,

 void CGOpenMPSIMDRuntime::emitFlush(CodeGenFunction &CGF,
                                     ArrayRef<const Expr *> Vars,
                                     SourceLocation Loc) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 void CGOpenMPSIMDRuntime::emitTaskCall(CodeGenFunction &CGF, SourceLocation Loc,
                                        const OMPExecutableDirective &D,
-                                       llvm::Value *TaskFunction,
+                                       llvm::Function *TaskFunction,
                                        QualType SharedsTy, Address Shareds,
                                        const Expr *IfCond,
                                        const OMPTaskDataTy &Data) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 void CGOpenMPSIMDRuntime::emitTaskLoopCall(
     CodeGenFunction &CGF, SourceLocation Loc, const OMPLoopDirective &D,
-    llvm::Value *TaskFunction, QualType SharedsTy, Address Shareds,
+    llvm::Function *TaskFunction, QualType SharedsTy, Address Shareds,
     const Expr *IfCond, const OMPTaskDataTy &Data) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 void CGOpenMPSIMDRuntime::emitReduction(
     CodeGenFunction &CGF, SourceLocation Loc, ArrayRef<const Expr *> Privates,
     ArrayRef<const Expr *> LHSExprs, ArrayRef<const Expr *> RHSExprs,
     ArrayRef<const Expr *> ReductionOps, ReductionOptionsTy Options) {
void CGOpenMPSIMDRuntime::emitTargetOutlinedFunction(
     const OMPExecutableDirective &D, StringRef ParentName,
     llvm::Function *&OutlinedFn, llvm::Constant *&OutlinedFnID,
     bool IsOffloadEntry, const RegionCodeGenTy &CodeGen) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 void CGOpenMPSIMDRuntime::emitTargetCall(CodeGenFunction &CGF,
                                          const OMPExecutableDirective &D,
-                                         llvm::Value *OutlinedFn,
+                                         llvm::Function *OutlinedFn,
                                          llvm::Value *OutlinedFnID,
-                                         const Expr *IfCond, const Expr *Device) {
+                                         const Expr *IfCond,
+                                         const Expr *Device) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 bool CGOpenMPSIMDRuntime::emitTargetFunctions(GlobalDecl GD) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 bool CGOpenMPSIMDRuntime::emitTargetGlobalVariable(GlobalDecl GD) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 bool CGOpenMPSIMDRuntime::emitTargetGlobal(GlobalDecl GD) {
   return false;
 }
 
 llvm::Function *CGOpenMPSIMDRuntime::emitRegistrationFunction() {
   return nullptr;
 }
 
 void CGOpenMPSIMDRuntime::emitTeamsCall(CodeGenFunction &CGF,
                                         const OMPExecutableDirective &D,
                                         SourceLocation Loc,
-                                        llvm::Value *OutlinedFn,
+                                        llvm::Function *OutlinedFn,
                                         ArrayRef<llvm::Value *> CapturedVars) {
   llvm_unreachable("Not supported in SIMD-only mode");
 }
 
 void CGOpenMPSIMDRuntime::emitNumTeamsClause(CodeGenFunction &CGF,
                                              const Expr *NumTeams,
                                              const Expr *ThreadLimit,
                                              SourceLocation Loc) {

lib/CodeGen/CGOpenMPRuntimeNVPTX.h

private:
   /// \param OutlinedFn Outlined function to be run in parallel threads. Type of
   /// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
   /// \param CapturedVars A pointer to the record with the references to
   /// variables used in \a OutlinedFn function.
   /// \param IfCond Condition in the associated 'if' clause, if it was
   /// specified, nullptr otherwise.
   ///
   void emitSPMDParallelCall(CodeGenFunction &CGF, SourceLocation Loc,
-                            llvm::Value *OutlinedFn,
+                            llvm::Function *OutlinedFn,
                             ArrayRef<llvm::Value *> CapturedVars,
                             const Expr *IfCond);
 
 protected:
   /// Get the function name of an outlined region.
   //  The name can be customized depending on the target.
   //
   StringRef getOutlinedHelperName() const override {
public:
   //  directive.
   /// \a D. This outlined function has type void(*)(kmp_int32 *ThreadID,
   /// kmp_int32 BoundID, struct context_vars*).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
-  llvm::Value *
+  llvm::Function *
   emitParallelOutlinedFunction(const OMPExecutableDirective &D,
                                const VarDecl *ThreadIDVar,
                                OpenMPDirectiveKind InnermostKind,
                                const RegionCodeGenTy &CodeGen) override;
 
   /// Emits inlined function for the specified OpenMP teams
   //  directive.
   /// \a D. This outlined function has type void(*)(kmp_int32 *ThreadID,
   /// kmp_int32 BoundID, struct context_vars*).
   /// \param D OpenMP directive.
   /// \param ThreadIDVar Variable for thread id in the current OpenMP region.
   /// \param InnermostKind Kind of innermost directive (for simple directives it
   /// is a directive itself, for combined - its innermost directive).
   /// \param CodeGen Code generation sequence for the \a D directive.
-  llvm::Value *
+  llvm::Function *
   emitTeamsOutlinedFunction(const OMPExecutableDirective &D,
                             const VarDecl *ThreadIDVar,
                             OpenMPDirectiveKind InnermostKind,
                             const RegionCodeGenTy &CodeGen) override;
 
   /// Emits code for teams call of the \a OutlinedFn with
   /// variables captured in a record which address is stored in \a
   /// CapturedStruct.
   /// \param OutlinedFn Outlined function to be run by team masters. Type of
   /// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
   /// \param CapturedVars A pointer to the record with the references to
   /// variables used in \a OutlinedFn function.
   ///
   void emitTeamsCall(CodeGenFunction &CGF, const OMPExecutableDirective &D,
-                     SourceLocation Loc, llvm::Value *OutlinedFn,
+                     SourceLocation Loc, llvm::Function *OutlinedFn,
                      ArrayRef<llvm::Value *> CapturedVars) override;
 
   /// Emits code for parallel or serial call of the \a OutlinedFn with
   /// variables captured in a record which address is stored in \a
   /// CapturedStruct.
   /// \param OutlinedFn Outlined function to be run in parallel threads. Type of
   /// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
   /// \param CapturedVars A pointer to the record with the references to
   /// variables used in \a OutlinedFn function.
   /// \param IfCond Condition in the associated 'if' clause, if it was
   /// specified, nullptr otherwise.
   void emitParallelCall(CodeGenFunction &CGF, SourceLocation Loc,
-                        llvm::Value *OutlinedFn,
+                        llvm::Function *OutlinedFn,
                         ArrayRef<llvm::Value *> CapturedVars,
                         const Expr *IfCond) override;
 
   /// Emit an implicit/explicit barrier for OpenMP threads.
   /// \param Kind Directive for which this implicit barrier call must be
   /// generated. Must be OMPD_barrier for explicit barrier generation.
   /// \param EmitChecks true if need to emit checks for cancellation barriers.
   /// \param ForceSimpleCall true simple barrier call must be emitted, false if
virtual void emitReduction(CodeGenFunction &CGF, SourceLocation Loc,
                              ArrayRef<const Expr *> RHSExprs,
                              ArrayRef<const Expr *> ReductionOps,
                              ReductionOptionsTy Options) override;
 
   /// Returns specified OpenMP runtime function for the current OpenMP
   /// implementation.  Specialized for the NVPTX device.
   /// \param Function OpenMP runtime function.
   /// \return Specified function.
-  llvm::Constant *createNVPTXRuntimeFunction(unsigned Function);
+  llvm::FunctionCallee createNVPTXRuntimeFunction(unsigned Function);
 
   /// Translates the native parameter of outlined function if this is required
   /// for target.
   /// \param FD Field decl from captured record for the parameter.
   /// \param NativeParam Parameter itself.
   const VarDecl *translateParameter(const FieldDecl *FD,
                                     const VarDecl *NativeParam) const override;
 
   /// Gets the address of the native argument basing on the address of the
   /// target-specific parameter.
   /// \param NativeParam Parameter itself.
   /// \param TargetParam Corresponding target-specific parameter.
   Address getParameterAddress(CodeGenFunction &CGF, const VarDecl *NativeParam,
                               const VarDecl *TargetParam) const override;
 
   /// Emits call of the outlined function with the provided arguments,
   /// translating these arguments to correct target-specific arguments.
   void emitOutlinedFunctionCall(
-      CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *OutlinedFn,
+      CodeGenFunction &CGF, SourceLocation Loc, llvm::FunctionCallee OutlinedFn,
       ArrayRef<llvm::Value *> Args = llvm::None) const override;
 
   /// Emits OpenMP-specific function prolog.
   /// Required for device constructs.
   void emitFunctionProlog(CodeGenFunction &CGF, const Decl *D) override;
 
   /// Gets the OpenMP-specific address of the local variable.
   Address getAddressOfLocalVariable(CodeGenFunction &CGF,

lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp

enum OpenMPRTLFunctionNVPTX {
   OMPRTL__kmpc_barrier,
   /// Call to void __kmpc_barrier_simple_spmd(ident_t *loc, kmp_int32
   /// global_tid);
   OMPRTL__kmpc_barrier_simple_spmd,
 };
 
 /// Pre(post)-action for different OpenMP constructs specialized for NVPTX.
 class NVPTXActionTy final : public PrePostActionTy {
-  llvm::Value *EnterCallee = nullptr;
+  llvm::FunctionCallee EnterCallee = nullptr;
   ArrayRef<llvm::Value *> EnterArgs;
-  llvm::Value *ExitCallee = nullptr;
+  llvm::FunctionCallee ExitCallee = nullptr;
   ArrayRef<llvm::Value *> ExitArgs;
   bool Conditional = false;
   llvm::BasicBlock *ContBlock = nullptr;
 
 public:
-  NVPTXActionTy(llvm::Value *EnterCallee, ArrayRef<llvm::Value *> EnterArgs,
-                llvm::Value *ExitCallee, ArrayRef<llvm::Value *> ExitArgs,
-                bool Conditional = false)
+  NVPTXActionTy(llvm::FunctionCallee EnterCallee,
+                ArrayRef<llvm::Value *> EnterArgs,
+                llvm::FunctionCallee ExitCallee,
+                ArrayRef<llvm::Value *> ExitArgs, bool Conditional = false)
       : EnterCallee(EnterCallee), EnterArgs(EnterArgs), ExitCallee(ExitCallee),
         ExitArgs(ExitArgs), Conditional(Conditional) {}
   void Enter(CodeGenFunction &CGF) override {
     llvm::Value *EnterRes = CGF.EmitRuntimeCall(EnterCallee, EnterArgs);
     if (Conditional) {
       llvm::Value *CallBool = CGF.Builder.CreateIsNotNull(EnterRes);
       auto *ThenBlock = CGF.createBasicBlock("omp_if.then");
       ContBlock = CGF.createBasicBlock("omp_if.end");
for (llvm::Function *W : Work) {
 
     CGF.EmitBlock(CheckNextBB);
   }
   // Default case: call to outlined function through pointer if the target
   // region makes a declare target call that may contain an orphaned parallel
   // directive.
   auto *ParallelFnTy =
       llvm::FunctionType::get(CGM.VoidTy, {CGM.Int16Ty, CGM.Int32Ty},
-                              /*isVarArg=*/false)
-          ->getPointerTo();
-  llvm::Value *WorkFnCast = Bld.CreateBitCast(WorkID, ParallelFnTy);
+                              /*isVarArg=*/false);
+  llvm::Value *WorkFnCast =
+      Bld.CreateBitCast(WorkID, ParallelFnTy->getPointerTo());
   // Insert call to work function via shared wrapper. The shared
   // wrapper takes two arguments:
   //   - the parallelism level;
   //   - the thread ID;
-  emitCall(CGF, WST.Loc, WorkFnCast,
+  emitCall(CGF, WST.Loc, {ParallelFnTy, WorkFnCast},
            {Bld.getInt16(/*ParallelLevel=*/0), getThreadID(CGF, WST.Loc)});
   // Go to end of parallel region.
   CGF.EmitBranch(TerminateBB);
 
   // Signal end of parallel region.
   CGF.EmitBlock(TerminateBB);
   CGF.EmitRuntimeCall(
       createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_kernel_end_parallel),
void CGOpenMPRuntimeNVPTX::emitWorkerLoop(CodeGenFunction &CGF,
   // Skip initialization.
   clearLocThreadIdInsertPt(CGF);
 }
 
 /// Returns specified OpenMP runtime function for the current OpenMP
 /// implementation.  Specialized for the NVPTX device.
 /// \param Function OpenMP runtime function.
 /// \return Specified function.
-llvm::Constant *
+llvm::FunctionCallee
 CGOpenMPRuntimeNVPTX::createNVPTXRuntimeFunction(unsigned Function) {
-  llvm::Constant *RTLFn = nullptr;
+  llvm::FunctionCallee RTLFn = nullptr;
   switch (static_cast<OpenMPRTLFunctionNVPTX>(Function)) {
   case OMPRTL_NVPTX__kmpc_kernel_init: {
     // Build void __kmpc_kernel_init(kmp_int32 thread_limit, int16_t
     // RequiresOMPRuntime);
     llvm::Type *TypeParams[] = {CGM.Int32Ty, CGM.Int16Ty};
     auto *FnTy =
         llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
     RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_kernel_init");
case OMPRTL_NVPTX__kmpc_restore_team_static_memory: {
     break;
   }
   case OMPRTL__kmpc_barrier: {
     // Build void __kmpc_barrier(ident_t *loc, kmp_int32 global_tid);
     llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty};
     auto *FnTy =
         llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
     RTLFn = CGM.CreateRuntimeFunction(FnTy, /*Name*/ "__kmpc_barrier");
-    cast<llvm::Function>(RTLFn)->addFnAttr(llvm::Attribute::Convergent);
+    cast<llvm::Function>(RTLFn.getCallee())
+        ->addFnAttr(llvm::Attribute::Convergent);
     break;
   }
   case OMPRTL__kmpc_barrier_simple_spmd: {
     // Build void __kmpc_barrier_simple_spmd(ident_t *loc, kmp_int32
     // global_tid);
     llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty};
     auto *FnTy =
         llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false);
     RTLFn =
         CGM.CreateRuntimeFunction(FnTy, /*Name*/ "__kmpc_barrier_simple_spmd");
-    cast<llvm::Function>(RTLFn)->addFnAttr(llvm::Attribute::Convergent);
+    cast<llvm::Function>(RTLFn.getCallee())
+        ->addFnAttr(llvm::Attribute::Convergent);
     break;
   }
   }
   return RTLFn;
 }
 
 void CGOpenMPRuntimeNVPTX::createOffloadEntry(llvm::Constant *ID,
                                               llvm::Constant *Addr,
void CGOpenMPRuntimeNVPTX::emitNumThreadsClause(CodeGenFunction &CGF,
   CGOpenMPRuntime::emitNumThreadsClause(CGF, NumThreads, Loc);
 }
 
 void CGOpenMPRuntimeNVPTX::emitNumTeamsClause(CodeGenFunction &CGF,
                                               const Expr *NumTeams,
                                               const Expr *ThreadLimit,
                                               SourceLocation Loc) {}
 
-llvm::Value *CGOpenMPRuntimeNVPTX::emitParallelOutlinedFunction(
+llvm::Function *CGOpenMPRuntimeNVPTX::emitParallelOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) {
   // Emit target region as a standalone region.
   class NVPTXPrePostActionTy : public PrePostActionTy {
     bool &IsInParallelRegion;
     bool PrevIsInParallelRegion;
 
   public:
getTeamsReductionVars(ASTContext &Ctx, const OMPExecutableDirective &D,
   assert(isOpenMPTeamsDirective(D.getDirectiveKind()) &&
          "expected teams directive.");
   for (const auto *C : D.getClausesOfKind<OMPReductionClause>()) {
     for (const Expr *E : C->privates())
       Vars.push_back(getPrivateItem(E));
   }
 }
 
-llvm::Value *CGOpenMPRuntimeNVPTX::emitTeamsOutlinedFunction(
+llvm::Function *CGOpenMPRuntimeNVPTX::emitTeamsOutlinedFunction(
     const OMPExecutableDirective &D, const VarDecl *ThreadIDVar,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) {
   SourceLocation Loc = D.getBeginLoc();
 
   const RecordDecl *GlobalizedRD = nullptr;
   llvm::SmallVector<const ValueDecl *, 4> LastPrivatesReductions;
   llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> MappedDeclsFields;
   // Globalize team reductions variable unconditionally in all modes.
void Enter(CodeGenFunction &CGF) override {
       Rt.emitGenericVarsProlog(CGF, Loc);
     }
     void Exit(CodeGenFunction &CGF) override {
       static_cast<CGOpenMPRuntimeNVPTX &>(CGF.CGM.getOpenMPRuntime())
           .emitGenericVarsEpilog(CGF);
     }
   } Action(Loc, GlobalizedRD, MappedDeclsFields);
   CodeGen.setAction(Action);
-  llvm::Value *OutlinedFunVal = CGOpenMPRuntime::emitTeamsOutlinedFunction(
+  llvm::Function *OutlinedFun = CGOpenMPRuntime::emitTeamsOutlinedFunction(
       D, ThreadIDVar, InnermostKind, CodeGen);
-  llvm::Function *OutlinedFun = cast<llvm::Function>(OutlinedFunVal);
   OutlinedFun->removeFnAttr(llvm::Attribute::NoInline);
   OutlinedFun->removeFnAttr(llvm::Attribute::OptimizeNone);
   OutlinedFun->addFnAttr(llvm::Attribute::AlwaysInline);
 
   return OutlinedFun;
 }
 
 void CGOpenMPRuntimeNVPTX::emitGenericVarsProlog(CodeGenFunction &CGF,
if (I->getSecond().GlobalRecordAddr) {
       }
     }
   }
 }
 
 void CGOpenMPRuntimeNVPTX::emitTeamsCall(CodeGenFunction &CGF,
                                          const OMPExecutableDirective &D,
                                          SourceLocation Loc,
-                                         llvm::Value *OutlinedFn,
+                                         llvm::Function *OutlinedFn,
                                          ArrayRef<llvm::Value *> CapturedVars) {
   if (!CGF.HaveInsertPoint())
     return;
 
   Address ZeroAddr = CGF.CreateMemTemp(
       CGF.getContext().getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/1),
       /*Name*/ ".zero.addr");
   CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0));
   llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs;
   OutlinedFnArgs.push_back(emitThreadIDAddress(CGF, Loc).getPointer());
   OutlinedFnArgs.push_back(ZeroAddr.getPointer());
   OutlinedFnArgs.append(CapturedVars.begin(), CapturedVars.end());
   emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, OutlinedFnArgs);
 }
 
 void CGOpenMPRuntimeNVPTX::emitParallelCall(
-    CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *OutlinedFn,
+    CodeGenFunction &CGF, SourceLocation Loc, llvm::Function *OutlinedFn,
     ArrayRef<llvm::Value *> CapturedVars, const Expr *IfCond) {
   if (!CGF.HaveInsertPoint())
     return;
 
   if (getExecutionMode() == CGOpenMPRuntimeNVPTX::EM_SPMD)
     emitSPMDParallelCall(CGF, Loc, OutlinedFn, CapturedVars, IfCond);
   else
     emitNonSPMDParallelCall(CGF, Loc, OutlinedFn, CapturedVars, IfCond);
void CGOpenMPRuntimeNVPTX::emitNonSPMDParallelCall(
   } else {
     CodeGenFunction::RunCleanupsScope Scope(CGF);
     RegionCodeGenTy ThenRCG(LNParallelGen);
     ThenRCG(CGF);
   }
 }
 
 void CGOpenMPRuntimeNVPTX::emitSPMDParallelCall(
-    CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *OutlinedFn,
+    CodeGenFunction &CGF, SourceLocation Loc, llvm::Function *OutlinedFn,
     ArrayRef<llvm::Value *> CapturedVars, const Expr *IfCond) {
   // Just call the outlined function to execute the parallel region.
   // OutlinedFn(&GTid, &zero, CapturedStruct);
   //
   llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs;
 
   Address ZeroAddr = CGF.CreateMemTemp(CGF.getContext().getIntTypeForBitwidth(
                                            /*DestWidth=*/32, /*Signed=*/1),

 /// Value copy:
 ///   In this step, we deal with the assumption made by algorithm 2
 ///   (i.e. contiguity assumption).  When we have an odd number of lanes
 ///   active, say 2k+1, only k threads will be effective and therefore k
 ///   new values will be produced.  However, the Reduce list owned by the
 ///   (2k+1)th thread is ignored in the value aggregation.  Therefore
 ///   we copy the Reduce list from the (2k+1)th lane to (k+1)th lane so
 ///   that the contiguity assumption still holds.
-static llvm::Value *emitShuffleAndReduceFunction(
+static llvm::Function *emitShuffleAndReduceFunction(
     CodeGenModule &CGM, ArrayRef<const Expr *> Privates,
-    QualType ReductionArrayTy, llvm::Value *ReduceFn, SourceLocation Loc) {
+    QualType ReductionArrayTy, llvm::Function *ReduceFn, SourceLocation Loc) {
   ASTContext &C = CGM.getContext();
 
   // Thread local Reduce list used to host the values of data to be reduced.
   ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr,
                                   C.VoidPtrTy, ImplicitParamDecl::Other);
   // Current lane id; could be logical.
   ImplicitParamDecl LaneIDArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.ShortTy,
                               ImplicitParamDecl::Other);
for (unsigned I = 0, E = RHSExprs.size(); I < E; ++I, ++IPriv, ++Idx) {
         CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy),
                                 Elem);
       }
     }
 
     llvm::Value *ReductionArrayTySize = CGF.getTypeSize(ReductionArrayTy);
     llvm::Value *RL = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(
         ReductionList.getPointer(), CGF.VoidPtrTy);
-    llvm::Value *ReductionFn = emitReductionFunction(
+    llvm::Function *ReductionFn = emitReductionFunction(
         CGM, Loc, CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo(),
         Privates, LHSExprs, RHSExprs, ReductionOps);
-    llvm::Value *ShuffleAndReduceFn = emitShuffleAndReduceFunction(
+    llvm::Function *ShuffleAndReduceFn = emitShuffleAndReduceFunction(
         CGM, Privates, ReductionArrayTy, ReductionFn, Loc);
     llvm::Value *InterWarpCopyFn =
         emitInterWarpCopyFunction(CGM, Privates, ReductionArrayTy, Loc);
 
     llvm::Value *Args[] = {RTLoc,
                            ThreadId,
                            CGF.Builder.getInt32(RHSExprs.size()),
                            ReductionArrayTySize,
TargetAddr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(
                       NativePointeeAddrSpace));
   Address NativeParamAddr = CGF.CreateMemTemp(NativeParamType);
   CGF.EmitStoreOfScalar(TargetAddr, NativeParamAddr, /*Volatile=*/false,
                         NativeParamType);
   return NativeParamAddr;
 }
 
 void CGOpenMPRuntimeNVPTX::emitOutlinedFunctionCall(
-    CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *OutlinedFn,
+    CodeGenFunction &CGF, SourceLocation Loc, llvm::FunctionCallee OutlinedFn,
     ArrayRef<llvm::Value *> Args) const {
   SmallVector<llvm::Value *, 4> TargetArgs;
   TargetArgs.reserve(Args.size());
-  auto *FnType =
-      cast<llvm::FunctionType>(OutlinedFn->getType()->getPointerElementType());
+  auto *FnType = OutlinedFn.getFunctionType();
   for (unsigned I = 0, E = Args.size(); I < E; ++I) {
     if (FnType->isVarArg() && FnType->getNumParams() <= I) {
       TargetArgs.append(std::next(Args.begin(), I), Args.end());
       break;
     }
     llvm::Type *TargetType = FnType->getParamType(I);
     llvm::Value *NativeArg = Args[I];
     if (!TargetType->isPointerTy()) {

lib/CodeGen/CGStmtOpenMP.cpp

typedef llvm::function_ref<void(CodeGenFunction &,
     CodeGenBoundParametersTy;
 } // anonymous namespace
 
 static void emitCommonOMPParallelDirective(
     CodeGenFunction &CGF, const OMPExecutableDirective &S,
     OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen,
     const CodeGenBoundParametersTy &CodeGenBoundParameters) {
   const CapturedStmt *CS = S.getCapturedStmt(OMPD_parallel);
-  llvm::Value *OutlinedFn =
+  llvm::Function *OutlinedFn =
       CGF.CGM.getOpenMPRuntime().emitParallelOutlinedFunction(
           S, *CS->getCapturedDecl()->param_begin(), InnermostKind, CodeGen);
   if (const auto *NumThreadsClause = S.getSingleClause<OMPNumThreadsClause>()) {
     CodeGenFunction::RunCleanupsScope NumThreadsScope(CGF);
     llvm::Value *NumThreads =
         CGF.EmitScalarExpr(NumThreadsClause->getNumThreads(),
                            /*IgnoreResultAssign=*/true);
     CGF.CGM.getOpenMPRuntime().emitNumThreadsClause(
for (const Expr *IRef : C->varlists())
       Data.Dependences.emplace_back(C->getDependencyKind(), IRef);
   auto &&CodeGen = [&Data, &S, CS, &BodyGen, &LastprivateDstsOrigs,
                     CapturedRegion](CodeGenFunction &CGF,
                                     PrePostActionTy &Action) {
     // Set proper addresses for generated private copies.
     OMPPrivateScope Scope(CGF);
     if (!Data.PrivateVars.empty() || !Data.FirstprivateVars.empty() ||
         !Data.LastprivateVars.empty()) {
+      llvm::FunctionType *CopyFnTy = llvm::FunctionType::get(
+          CGF.Builder.getVoidTy(), {CGF.Builder.getInt8PtrTy()}, true);
       enum { PrivatesParam = 2, CopyFnParam = 3 };
       llvm::Value *CopyFn = CGF.Builder.CreateLoad(
           CGF.GetAddrOfLocalVar(CS->getCapturedDecl()->getParam(CopyFnParam)));
       llvm::Value *PrivatesPtr = CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(
           CS->getCapturedDecl()->getParam(PrivatesParam)));
       // Map privates.
       llvm::SmallVector<std::pair<const VarDecl *, Address>, 16> PrivatePtrs;
       llvm::SmallVector<llvm::Value *, 16> CallArgs;
if (!Data.PrivateVars.empty() || !Data.FirstprivateVars.empty() ||
       for (const Expr *E : Data.LastprivateVars) {
         const auto *VD = cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl());
         Address PrivatePtr =
             CGF.CreateMemTemp(CGF.getContext().getPointerType(E->getType()),
                               ".lastpriv.ptr.addr");
         PrivatePtrs.emplace_back(VD, PrivatePtr);
         CallArgs.push_back(PrivatePtr.getPointer());
       }
-      CGF.CGM.getOpenMPRuntime().emitOutlinedFunctionCall(CGF, S.getBeginLoc(),
-                                                          CopyFn, CallArgs);
+      CGF.CGM.getOpenMPRuntime().emitOutlinedFunctionCall(
+          CGF, S.getBeginLoc(), {CopyFnTy, CopyFn}, CallArgs);
       for (const auto &Pair : LastprivateDstsOrigs) {
         const auto *OrigVD = cast<VarDecl>(Pair.second->getDecl());
         DeclRefExpr DRE(CGF.getContext(), const_cast<VarDecl *>(OrigVD),
                         /*RefersToEnclosingVariableOrCapture=*/
                             CGF.CapturedStmtInfo->lookup(OrigVD) != nullptr,
                         Pair.second->getType(), VK_LValue,
                         Pair.second->getExprLoc());
         Scope.addPrivate(Pair.first, [&CGF, &DRE]() {
if (!InRedVars.empty()) {
                               [Replacement]() { return Replacement; });
       }
     }
     (void)InRedScope.Privatize();
 
     Action.Enter(CGF);
     BodyGen(CGF);
   };
-  llvm::Value *OutlinedFn = CGM.getOpenMPRuntime().emitTaskOutlinedFunction(
+  llvm::Function *OutlinedFn = CGM.getOpenMPRuntime().emitTaskOutlinedFunction(
       S, *I, *PartId, *TaskT, S.getDirectiveKind(), CodeGen, Data.Tied,
       Data.NumberOfParts);
   OMPLexicalScope Scope(*this, S);
   TaskGen(*this, OutlinedFn, Data);
 }
 
 static ImplicitParamDecl *
 createImplicitFirstprivateForType(ASTContext &C, OMPTaskDataTy &Data,
void CodeGenFunction::EmitOMPTargetTaskBasedDirective(
   for (const auto *C : S.getClausesOfKind<OMPDependClause>())
     for (const Expr *IRef : C->varlists())
       Data.Dependences.emplace_back(C->getDependencyKind(), IRef);
   auto &&CodeGen = [&Data, &S, CS, &BodyGen, BPVD, PVD, SVD,
                     &InputInfo](CodeGenFunction &CGF, PrePostActionTy &Action) {
     // Set proper addresses for generated private copies.
     OMPPrivateScope Scope(CGF);
     if (!Data.FirstprivateVars.empty()) {
+      llvm::FunctionType *CopyFnTy = llvm::FunctionType::get(
+          CGF.Builder.getVoidTy(), {CGF.Builder.getInt8PtrTy()}, true);
       enum { PrivatesParam = 2, CopyFnParam = 3 };
       llvm::Value *CopyFn = CGF.Builder.CreateLoad(
           CGF.GetAddrOfLocalVar(CS->getCapturedDecl()->getParam(CopyFnParam)));
       llvm::Value *PrivatesPtr = CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(
           CS->getCapturedDecl()->getParam(PrivatesParam)));
       // Map privates.
       llvm::SmallVector<std::pair<const VarDecl *, Address>, 16> PrivatePtrs;
       llvm::SmallVector<llvm::Value *, 16> CallArgs;
       CallArgs.push_back(PrivatesPtr);
       for (const Expr *E : Data.FirstprivateVars) {
         const auto *VD = cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl());
         Address PrivatePtr =
             CGF.CreateMemTemp(CGF.getContext().getPointerType(E->getType()),
                               ".firstpriv.ptr.addr");
         PrivatePtrs.emplace_back(VD, PrivatePtr);
         CallArgs.push_back(PrivatePtr.getPointer());
       }
-      CGF.CGM.getOpenMPRuntime().emitOutlinedFunctionCall(CGF, S.getBeginLoc(),
-                                                          CopyFn, CallArgs);
+      CGF.CGM.getOpenMPRuntime().emitOutlinedFunctionCall(
+          CGF, S.getBeginLoc(), {CopyFnTy, CopyFn}, CallArgs);
       for (const auto &Pair : PrivatePtrs) {
         Address Replacement(CGF.Builder.CreateLoad(Pair.second),
                             CGF.getContext().getDeclAlign(Pair.first));
         Scope.addPrivate(Pair.first, [Replacement]() { return Replacement; });
       }
     }
     // Privatize all private variables except for in_reduction items.
     (void)Scope.Privatize();
     if (InputInfo.NumberOfTargetItems > 0) {
       InputInfo.BasePointersArray = CGF.Builder.CreateConstArrayGEP(
           CGF.GetAddrOfLocalVar(BPVD), /*Index=*/0, CGF.getPointerSize());
       InputInfo.PointersArray = CGF.Builder.CreateConstArrayGEP(
           CGF.GetAddrOfLocalVar(PVD), /*Index=*/0, CGF.getPointerSize());
       InputInfo.SizesArray = CGF.Builder.CreateConstArrayGEP(
           CGF.GetAddrOfLocalVar(SVD), /*Index=*/0, CGF.getSizeSize());
     }
 
     Action.Enter(CGF);
     OMPLexicalScope LexScope(CGF, S, OMPD_task, /*EmitPreInitStmt=*/false);
     BodyGen(CGF);
   };
-  llvm::Value *OutlinedFn = CGM.getOpenMPRuntime().emitTaskOutlinedFunction(
+  llvm::Function *OutlinedFn = CGM.getOpenMPRuntime().emitTaskOutlinedFunction(
       S, *I, *PartId, *TaskT, S.getDirectiveKind(), CodeGen, /*Tied=*/true,
       Data.NumberOfParts);
   llvm::APInt TrueOrFalse(32, S.hasClausesOfKind<OMPNowaitClause>() ? 1 : 0);
   IntegerLiteral IfCond(getContext(), TrueOrFalse,
                         getContext().getIntTypeForBitwidth(32, /*Signed=*/0),
                         SourceLocation());
 
   CGM.getOpenMPRuntime().emitTaskCall(*this, S.getBeginLoc(), S, OutlinedFn,
void CodeGenFunction::EmitOMPTaskDirective(const OMPTaskDirective &S) {
 
   OMPTaskDataTy Data;
   // Check if we should emit tied or untied task.
   Data.Tied = !S.getSingleClause<OMPUntiedClause>();
   auto &&BodyGen = [CS](CodeGenFunction &CGF, PrePostActionTy &) {
     CGF.EmitStmt(CS->getCapturedStmt());
   };
   auto &&TaskGen = [&S, SharedsTy, CapturedStruct,
-                    IfCond](CodeGenFunction &CGF, llvm::Value *OutlinedFn,
+                    IfCond](CodeGenFunction &CGF, llvm::Function *OutlinedFn,
                             const OMPTaskDataTy &Data) {
     CGF.CGM.getOpenMPRuntime().emitTaskCall(CGF, S.getBeginLoc(), S, OutlinedFn,
                                             SharedsTy, CapturedStruct, IfCond,
                                             Data);
   };
   EmitOMPTaskBasedDirective(S, OMPD_task, BodyGen, TaskGen, Data);
 }
 
void CodeGenFunction::EmitOMPTargetDirective(const OMPTargetDirective &S) {
   emitCommonOMPTargetDirective(*this, S, CodeGen);
 }
 
 static void emitCommonOMPTeamsDirective(CodeGenFunction &CGF,
                                         const OMPExecutableDirective &S,
                                         OpenMPDirectiveKind InnermostKind,
                                         const RegionCodeGenTy &CodeGen) {
   const CapturedStmt *CS = S.getCapturedStmt(OMPD_teams);
-  llvm::Value *OutlinedFn =
+  llvm::Function *OutlinedFn =
       CGF.CGM.getOpenMPRuntime().emitTeamsOutlinedFunction(
           S, *CS->getCapturedDecl()->param_begin(), InnermostKind, CodeGen);
 
   const auto *NT = S.getSingleClause<OMPNumTeamsClause>();
   const auto *TL = S.getSingleClause<OMPThreadLimitClause>();
   if (NT || TL) {
     const Expr *NumTeams = NT ? NT->getNumTeams() : nullptr;
     const Expr *ThreadLimit = TL ? TL->getThreadLimit() : nullptr;
if (HasLastprivateClause) {
       CGF.EmitOMPLastprivateClauseFinal(
           S, isOpenMPSimdDirective(S.getDirectiveKind()),
           CGF.Builder.CreateIsNotNull(CGF.EmitLoadOfScalar(
               CGF.GetAddrOfLocalVar(*LIP), /*Volatile=*/false,
               (*LIP)->getType(), S.getBeginLoc())));
     }
   };
   auto &&TaskGen = [&S, SharedsTy, CapturedStruct,
-                    IfCond](CodeGenFunction &CGF, llvm::Value *OutlinedFn,
+                    IfCond](CodeGenFunction &CGF, llvm::Function *OutlinedFn,
                             const OMPTaskDataTy &Data) {
     auto &&CodeGen = [&S, OutlinedFn, SharedsTy, CapturedStruct, IfCond,
                       &Data](CodeGenFunction &CGF, PrePostActionTy &) {
       OMPLoopScope PreInitScope(CGF, S);
       CGF.CGM.getOpenMPRuntime().emitTaskLoopCall(CGF, S.getBeginLoc(), S,
                                                   OutlinedFn, SharedsTy,
                                                   CapturedStruct, IfCond, Data);
     };

lib/CodeGen/CGVTables.cpp

if (CGM.getLangOpts().CUDA) {
       if (!CanEmitMethod)
         return builder.addNullPointer(CGM.Int8PtrTy);
       // Method is acceptable, continue processing as usual.
     }
 
     auto getSpecialVirtualFn = [&](StringRef name) {
       llvm::FunctionType *fnTy =
           llvm::FunctionType::get(CGM.VoidTy, /*isVarArg=*/false);
-      llvm::Constant *fn = CGM.CreateRuntimeFunction(fnTy, name);
+      llvm::Constant *fn = cast<llvm::Constant>(
+          CGM.CreateRuntimeFunction(fnTy, name).getCallee());
       if (auto f = dyn_cast<llvm::Function>(fn))
         f->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
       return llvm::ConstantExpr::getBitCast(fn, CGM.Int8PtrTy);
     };
 
     llvm::Constant *fnPtr;
 
     // Pure virtual member functions.

lib/CodeGen/CodeGenFunction.h

public:
   SmallVector<llvm::Value*, 8> ObjCEHValueStack;
 
   /// A class controlling the emission of a finally block.
   class FinallyInfo {
     /// Where the catchall's edge through the cleanup should go.
     JumpDest RethrowDest;
 
     /// A function to call to enter the catch.
-    llvm::Constant *BeginCatchFn;
+    llvm::FunctionCallee BeginCatchFn;
 
     /// An i1 variable indicating whether or not the @finally is
     /// running for an exception.
     llvm::AllocaInst *ForEHVar;
 
     /// An i8* variable into which the exception pointer to rethrow
     /// has been saved.
     llvm::AllocaInst *SavedExnVar;
 
   public:
     void enter(CodeGenFunction &CGF, const Stmt *Finally,
-               llvm::Constant *beginCatchFn, llvm::Constant *endCatchFn,
-               llvm::Constant *rethrowFn);
+               llvm::FunctionCallee beginCatchFn,
+               llvm::FunctionCallee endCatchFn, llvm::FunctionCallee rethrowFn);
     void exit(CodeGenFunction &CGF);
   };
 
   /// Returns true inside SEH __try blocks.
   bool isSEHTryScope() const { return !SEHTryEpilogueStack.empty(); }
 
   /// Returns true while emitting a cleanuppad.
   bool isCleanupPadScope() const {

   /// and initializes them with the values according to OpenMP standard.
   ///
   /// \param D Directive (possibly) with the 'linear' clause.
   /// \return true if at least one linear variable is found that should be
   /// initialized with the value of the original variable, false otherwise.
   bool EmitOMPLinearClauseInit(const OMPLoopDirective &D);
 
   typedef const llvm::function_ref<void(CodeGenFunction & /*CGF*/,
-                                        llvm::Value * /*OutlinedFn*/,
+                                        llvm::Function * /*OutlinedFn*/,
                                         const OMPTaskDataTy & /*Data*/)>
       TaskGenTy;
   void EmitOMPTaskBasedDirective(const OMPExecutableDirective &S,
                                  const OpenMPDirectiveKind CapturedRegion,
                                  const RegionCodeGenTy &BodyGen,
                                  const TaskGenTy &TaskGen, OMPTaskDataTy &Data);
   struct OMPTargetDataInfo {
     Address BasePointersArray = Address::invalid();
RValue EmitCall(QualType FnType, const CGCallee &Callee, const CallExpr *E,
                   ReturnValueSlot ReturnValue, llvm::Value *Chain = nullptr);
   RValue EmitCallExpr(const CallExpr *E,
                       ReturnValueSlot ReturnValue = ReturnValueSlot());
   RValue EmitSimpleCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue);
   CGCallee EmitCallee(const Expr *E);
 
   void checkTargetFeatures(const CallExpr *E, const FunctionDecl *TargetDecl);
 
-  llvm::CallInst *EmitRuntimeCall(llvm::Value *callee,
+  llvm::CallInst *EmitRuntimeCall(llvm::FunctionCallee callee,
                                   const Twine &name = "");
-  llvm::CallInst *EmitRuntimeCall(llvm::Value *callee,
-                                  ArrayRef<llvm::Value*> args,
+  llvm::CallInst *EmitRuntimeCall(llvm::FunctionCallee callee,
+                                  ArrayRef<llvm::Value *> args,
                                   const Twine &name = "");
-  llvm::CallInst *EmitNounwindRuntimeCall(llvm::Value *callee,
+  llvm::CallInst *EmitNounwindRuntimeCall(llvm::FunctionCallee callee,
                                           const Twine &name = "");
-  llvm::CallInst *EmitNounwindRuntimeCall(llvm::Value *callee,
-                                          ArrayRef<llvm::Value*> args,
+  llvm::CallInst *EmitNounwindRuntimeCall(llvm::FunctionCallee callee,
+                                          ArrayRef<llvm::Value *> args,
                                           const Twine &name = "");
 
   SmallVector<llvm::OperandBundleDef, 1>
   getBundlesForFunclet(llvm::Value *Callee);
 
-  llvm::CallBase *EmitCallOrInvoke(llvm::Value *Callee,
+  llvm::CallBase *EmitCallOrInvoke(llvm::FunctionCallee Callee,
                                    ArrayRef<llvm::Value *> Args,
                                    const Twine &Name = "");
-  llvm::CallBase *EmitRuntimeCallOrInvoke(llvm::Value *callee,
+  llvm::CallBase *EmitRuntimeCallOrInvoke(llvm::FunctionCallee callee,
                                           ArrayRef<llvm::Value *> args,
                                           const Twine &name = "");
-  llvm::CallBase *EmitRuntimeCallOrInvoke(llvm::Value *callee,
+  llvm::CallBase *EmitRuntimeCallOrInvoke(llvm::FunctionCallee callee,
                                           const Twine &name = "");
-  void EmitNoreturnRuntimeCallOrInvoke(llvm::Value *callee,
-                                       ArrayRef<llvm::Value*> args);
+  void EmitNoreturnRuntimeCallOrInvoke(llvm::FunctionCallee callee,
+                                       ArrayRef<llvm::Value *> args);
 
   CGCallee BuildAppleKextVirtualCall(const CXXMethodDecl *MD,
                                      NestedNameSpecifier *Qual,
                                      llvm::Type *Ty);
 
   CGCallee BuildAppleKextVirtualDestructorCall(const CXXDestructorDecl *DD,
                                                CXXDtorType Type,
                                                const CXXRecordDecl *RD);

lib/CodeGen/CodeGenModule.h

return std::tie(priority, lex_order) <
            std::tie(RHS.priority, RHS.lex_order);
   }
 };
 
 struct ObjCEntrypoints {
   ObjCEntrypoints() { memset(this, 0, sizeof(*this)); }
 
   /// void objc_alloc(id);
-  llvm::Constant *objc_alloc;
+  llvm::FunctionCallee objc_alloc;
 
   /// void objc_allocWithZone(id);
-  llvm::Constant *objc_allocWithZone;
+  llvm::FunctionCallee objc_allocWithZone;
 
   /// void objc_autoreleasePoolPop(void*);
-  llvm::Constant *objc_autoreleasePoolPop;
+  llvm::FunctionCallee objc_autoreleasePoolPop;
 
   /// void objc_autoreleasePoolPop(void*);
   /// Note this method is used when we are using exception handling
-  llvm::Constant *objc_autoreleasePoolPopInvoke;
+  llvm::FunctionCallee objc_autoreleasePoolPopInvoke;
 
   /// void *objc_autoreleasePoolPush(void);
-  llvm::Constant *objc_autoreleasePoolPush;
+  llvm::Function *objc_autoreleasePoolPush;
 
   /// id objc_autorelease(id);
-  llvm::Constant *objc_autorelease;
+  llvm::Function *objc_autorelease;
 
   /// id objc_autorelease(id);
   /// Note this is the runtime method not the intrinsic.
-  llvm::Constant *objc_autoreleaseRuntimeFunction;
+  llvm::FunctionCallee objc_autoreleaseRuntimeFunction;
 
   /// id objc_autoreleaseReturnValue(id);
-  llvm::Constant *objc_autoreleaseReturnValue;
+  llvm::Function *objc_autoreleaseReturnValue;
 
   /// void objc_copyWeak(id *dest, id *src);
-  llvm::Constant *objc_copyWeak;
+  llvm::Function *objc_copyWeak;
 
   /// void objc_destroyWeak(id*);
-  llvm::Constant *objc_destroyWeak;
+  llvm::Function *objc_destroyWeak;
 
   /// id objc_initWeak(id*, id);
-  llvm::Constant *objc_initWeak;
+  llvm::Function *objc_initWeak;
 
   /// id objc_loadWeak(id*);
-  llvm::Constant *objc_loadWeak;
+  llvm::Function *objc_loadWeak;
 
   /// id objc_loadWeakRetained(id*);
-  llvm::Constant *objc_loadWeakRetained;
+  llvm::Function *objc_loadWeakRetained;
 
   /// void objc_moveWeak(id *dest, id *src);
-  llvm::Constant *objc_moveWeak;
+  llvm::Function *objc_moveWeak;
 
   /// id objc_retain(id);
-  llvm::Constant *objc_retain;
+  llvm::Function *objc_retain;
 
   /// id objc_retain(id);
   /// Note this is the runtime method not the intrinsic.
-  llvm::Constant *objc_retainRuntimeFunction;
+  llvm::FunctionCallee objc_retainRuntimeFunction;
 
   /// id objc_retainAutorelease(id);
-  llvm::Constant *objc_retainAutorelease;
+  llvm::Function *objc_retainAutorelease;
 
   /// id objc_retainAutoreleaseReturnValue(id);
-  llvm::Constant *objc_retainAutoreleaseReturnValue;
+  llvm::Function *objc_retainAutoreleaseReturnValue;
 
   /// id objc_retainAutoreleasedReturnValue(id);
-  llvm::Constant *objc_retainAutoreleasedReturnValue;
+  llvm::Function *objc_retainAutoreleasedReturnValue;
 
   /// id objc_retainBlock(id);
-  llvm::Constant *objc_retainBlock;
+  llvm::Function *objc_retainBlock;
 
   /// void objc_release(id);
-  llvm::Constant *objc_release;
+  llvm::Function *objc_release;
 
   /// void objc_release(id);
   /// Note this is the runtime method not the intrinsic.
-  llvm::Constant *objc_releaseRuntimeFunction;
+  llvm::FunctionCallee objc_releaseRuntimeFunction;
 
   /// void objc_storeStrong(id*, id);
-  llvm::Constant *objc_storeStrong;
+  llvm::Function *objc_storeStrong;
 
   /// id objc_storeWeak(id*, id);
-  llvm::Constant *objc_storeWeak;
+  llvm::Function *objc_storeWeak;
 
   /// id objc_unsafeClaimAutoreleasedReturnValue(id);
-  llvm::Constant *objc_unsafeClaimAutoreleasedReturnValue;
+  llvm::Function *objc_unsafeClaimAutoreleasedReturnValue;
 
   /// A void(void) inline asm to use to mark that the return value of
   /// a call will be immediately retain.
   llvm::InlineAsm *retainAutoreleasedReturnValueMarker;
 
   /// void clang.arc.use(...);
-  llvm::Constant *clang_arc_use;
+  llvm::Function *clang_arc_use;
 };
 
 /// This class records statistics on instrumentation based profiling.
 class InstrProfStats {
   uint32_t VisitedInMainFile;
   uint32_t MissingInMainFile;
   uint32_t Visited;
   uint32_t Missing;
private:
   llvm::DenseMap<const BlockExpr *, llvm::Constant *> EmittedGlobalBlocks;
 
   /// @name Cache for Blocks Runtime Globals
   /// @{
 
   llvm::Constant *NSConcreteGlobalBlock = nullptr;
   llvm::Constant *NSConcreteStackBlock = nullptr;
 
-  llvm::Constant *BlockObjectAssign = nullptr;
-  llvm::Constant *BlockObjectDispose = nullptr;
+  llvm::FunctionCallee BlockObjectAssign = nullptr;
+  llvm::FunctionCallee BlockObjectDispose = nullptr;
 
   llvm::Type *BlockDescriptorType = nullptr;
   llvm::Type *GenericBlockLiteralType = nullptr;
 
   struct {
     int GlobalUniqueCount;
   } Block;
 
public:
 
   ObjCEntrypoints &getObjCEntrypoints() const {
     assert(ObjCData != nullptr);
     return *ObjCData;
   }
 
   // Version checking function, used to implement ObjC's @available:
   // i32 @__isOSVersionAtLeast(i32, i32, i32)
-  llvm::Constant *IsOSVersionAtLeastFn = nullptr;
+  llvm::FunctionCallee IsOSVersionAtLeastFn = nullptr;
 
   InstrProfStats &getPGOStats() { return PGOStats; }
   llvm::IndexedInstrProfReader *getPGOReader() const { return PGOReader.get(); }
 
   CoverageMappingModuleGen *getCoverageMapping() const {
     return CoverageMapping.get();
   }
 
public:
   /// Add a global to a list to be added to the llvm.compiler.used metadata.
   void addCompilerUsedGlobal(llvm::GlobalValue *GV);
 
   /// Add a destructor and object to add to the C++ global destructor function.
   void AddCXXDtorEntry(llvm::Constant *DtorFn, llvm::Constant *Object) {
     CXXGlobalDtors.emplace_back(DtorFn, Object);
   }
 
-  /// Create a new runtime function with the specified type and name.
-  llvm::Constant *
+  /// Create or return a runtime function declaration with the specified type
+  /// and name.
+  llvm::FunctionCallee
   CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name,
                         llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
                         bool Local = false);
 
-  /// Create a new compiler builtin function with the specified type and name.
-  llvm::Constant *
-  CreateBuiltinFunction(llvm::FunctionType *Ty, StringRef Name,
-                        llvm::AttributeList ExtraAttrs = llvm::AttributeList());
   /// Create a new runtime global variable with the specified type and name.
   llvm::Constant *CreateRuntimeVariable(llvm::Type *Ty,
                                         StringRef Name);
 
   ///@name Custom Blocks Runtime Interfaces
   ///@{
 
   llvm::Constant *getNSConcreteGlobalBlock();
   llvm::Constant *getNSConcreteStackBlock();
-  llvm::Constant *getBlockObjectAssign();
-  llvm::Constant *getBlockObjectDispose();
+  llvm::FunctionCallee getBlockObjectAssign();
+  llvm::FunctionCallee getBlockObjectDispose();
 
   ///@}
 
   llvm::Constant *getLLVMLifetimeStartFn();
   llvm::Constant *getLLVMLifetimeEndFn();
 
   // Make sure that this type is translated.
   void UpdateCompletedType(const TagDecl *TD);
public:
   /// control flow integrity checks for member function pointers.
   ///
   /// A most-base class of a class C is defined as a recursive base class of C,
   /// including C itself, that does not have any bases.
   std::vector<const CXXRecordDecl *>
   getMostBaseClasses(const CXXRecordDecl *RD);
 
   /// Get the declaration of std::terminate for the platform.
-  llvm::Constant *getTerminateFn();
+  llvm::FunctionCallee getTerminateFn();
 
   llvm::SanitizerStatReport &getSanStats();
 
   llvm::Value *
   createOpenCLIntToSamplerConversion(const Expr *E, CodeGenFunction &CGF);
 
   /// Get target specific null pointer.
   /// \param T is the LLVM type of the null pointer.

lib/CodeGen/CodeGenModule.cpp

for (const auto &N : {"__cxxabiv1", "std"}) {
     }
   }
 
   return nullptr;
 }
 
 /// CreateRuntimeFunction - Create a new runtime function with the specified
 /// type and name.
-llvm::Constant *
+llvm::FunctionCallee
 CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
                                      llvm::AttributeList ExtraAttrs,
                                      bool Local) {
   llvm::Constant *C =
       GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(), /*ForVTable=*/false,
                               /*DontDefer=*/false, /*IsThunk=*/false,
                               ExtraAttrs);
 
if (F->empty()) {
           F->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
           F->setLinkage(llvm::GlobalValue::ExternalLinkage);
         }
       }
       setDSOLocal(F);
     }
   }
 
-  return C;
-}
-
-/// CreateBuiltinFunction - Create a new builtin function with the specified
-/// type and name.
-llvm::Constant *
-CodeGenModule::CreateBuiltinFunction(llvm::FunctionType *FTy, StringRef Name,
-                                     llvm::AttributeList ExtraAttrs) {
-  return CreateRuntimeFunction(FTy, Name, ExtraAttrs, true);
+  return {FTy, C};
 }
 
 /// isTypeConstant - Determine whether an object of this type can be emitted
 /// as a constant.
 ///
 /// If ExcludeCtor is true, the duration when the object's constructor runs
 /// will not be considered. The caller will need to verify that the object is
 /// not written to during its construction.

lib/CodeGen/ItaniumCXXABI.cpp

 }
 
 void ItaniumCXXABI::emitRethrow(CodeGenFunction &CGF, bool isNoReturn) {
   // void __cxa_rethrow();
 
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.VoidTy, /*IsVarArgs=*/false);
 
-  llvm::Constant *Fn = CGM.CreateRuntimeFunction(FTy, "__cxa_rethrow");
+  llvm::FunctionCallee Fn = CGM.CreateRuntimeFunction(FTy, "__cxa_rethrow");
 
   if (isNoReturn)
     CGF.EmitNoreturnRuntimeCallOrInvoke(Fn, None);
   else
     CGF.EmitRuntimeCallOrInvoke(Fn);
 }
 
-static llvm::Constant *getAllocateExceptionFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getAllocateExceptionFn(CodeGenModule &CGM) {
   // void *__cxa_allocate_exception(size_t thrown_size);
 
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.Int8PtrTy, CGM.SizeTy, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_allocate_exception");
 }
 
-static llvm::Constant *getThrowFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getThrowFn(CodeGenModule &CGM) {
   // void __cxa_throw(void *thrown_exception, std::type_info *tinfo,
   //                  void (*dest) (void *));
 
   llvm::Type *Args[3] = { CGM.Int8PtrTy, CGM.Int8PtrTy, CGM.Int8PtrTy };
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.VoidTy, Args, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_throw");
 }
 
 void ItaniumCXXABI::emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) {
   QualType ThrowType = E->getSubExpr()->getType();
   // Now allocate the exception object.
   llvm::Type *SizeTy = CGF.ConvertType(getContext().getSizeType());
   uint64_t TypeSize = getContext().getTypeSizeInChars(ThrowType).getQuantity();
 
-  llvm::Constant *AllocExceptionFn = getAllocateExceptionFn(CGM);
+  llvm::FunctionCallee AllocExceptionFn = getAllocateExceptionFn(CGM);
   llvm::CallInst *ExceptionPtr = CGF.EmitNounwindRuntimeCall(
       AllocExceptionFn, llvm::ConstantInt::get(SizeTy, TypeSize), "exception");
 
   CharUnits ExnAlign = getAlignmentOfExnObject();
   CGF.EmitAnyExprToExn(E->getSubExpr(), Address(ExceptionPtr, ExnAlign));
 
   // Now throw the exception.
   llvm::Constant *TypeInfo = CGM.GetAddrOfRTTIDescriptor(ThrowType,
if (const RecordType *RecordTy = ThrowType->getAs<RecordType>()) {
     }
   }
   if (!Dtor) Dtor = llvm::Constant::getNullValue(CGM.Int8PtrTy);
 
   llvm::Value *args[] = { ExceptionPtr, TypeInfo, Dtor };
   CGF.EmitNoreturnRuntimeCallOrInvoke(getThrowFn(CGM), args);
 }
 
-static llvm::Constant *getItaniumDynamicCastFn(CodeGenFunction &CGF) {
+static llvm::FunctionCallee getItaniumDynamicCastFn(CodeGenFunction &CGF) {
   // void *__dynamic_cast(const void *sub,
   //                      const abi::__class_type_info *src,
   //                      const abi::__class_type_info *dst,
   //                      std::ptrdiff_t src2dst_offset);
 
   llvm::Type *Int8PtrTy = CGF.Int8PtrTy;
   llvm::Type *PtrDiffTy =
     CGF.ConvertType(CGF.getContext().getPointerDiffType());
 
   llvm::Type *Args[4] = { Int8PtrTy, Int8PtrTy, Int8PtrTy, PtrDiffTy };
 
   llvm::FunctionType *FTy = llvm::FunctionType::get(Int8PtrTy, Args, false);
 
   // Mark the function as nounwind readonly.
   llvm::Attribute::AttrKind FuncAttrs[] = { llvm::Attribute::NoUnwind,
                                             llvm::Attribute::ReadOnly };
   llvm::AttributeList Attrs = llvm::AttributeList::get(
       CGF.getLLVMContext(), llvm::AttributeList::FunctionIndex, FuncAttrs);
 
   return CGF.CGM.CreateRuntimeFunction(FTy, "__dynamic_cast", Attrs);
 }
 
-static llvm::Constant *getBadCastFn(CodeGenFunction &CGF) {
+static llvm::FunctionCallee getBadCastFn(CodeGenFunction &CGF) {
   // void __cxa_bad_cast();
   llvm::FunctionType *FTy = llvm::FunctionType::get(CGF.VoidTy, false);
   return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_bad_cast");
 }
 
 /// Compute the src2dst_offset hint as described in the
 /// Itanium C++ ABI [2.9.7]
 static CharUnits computeOffsetHint(ASTContext &Context,
static CharUnits computeOffsetHint(ASTContext &Context,
   if (NumPublicPaths > 1)
     return CharUnits::fromQuantity(-3ULL);
 
   // Otherwise, the Src type is a unique public nonvirtual base type of Dst.
   // Return the offset of Src from the origin of Dst.
   return Offset;
 }
 
-static llvm::Constant *getBadTypeidFn(CodeGenFunction &CGF) {
+static llvm::FunctionCallee getBadTypeidFn(CodeGenFunction &CGF) {
   // void __cxa_bad_typeid();
   llvm::FunctionType *FTy = llvm::FunctionType::get(CGF.VoidTy, false);
 
   return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_bad_typeid");
 }
 
 bool ItaniumCXXABI::shouldTypeidBeNullChecked(bool IsDeref,
                                               QualType SrcRecordTy) {
   return IsDeref;
 }
 
 void ItaniumCXXABI::EmitBadTypeidCall(CodeGenFunction &CGF) {
-  llvm::Value *Fn = getBadTypeidFn(CGF);
+  llvm::FunctionCallee Fn = getBadTypeidFn(CGF);
   llvm::CallBase *Call = CGF.EmitRuntimeCallOrInvoke(Fn);
   Call->setDoesNotReturn();
   CGF.Builder.CreateUnreachable();
 }
 
 llvm::Value *ItaniumCXXABI::EmitTypeid(CodeGenFunction &CGF,
                                        QualType SrcRecordTy,
                                        Address ThisPtr,
llvm::Value *ItaniumCXXABI::EmitDynamicCastToVoid(CodeGenFunction &CGF,
   llvm::Value *Value = ThisAddr.getPointer();
   Value = CGF.EmitCastToVoidPtr(Value);
   Value = CGF.Builder.CreateInBoundsGEP(Value, OffsetToTop);
 
   return CGF.Builder.CreateBitCast(Value, DestLTy);
 }
 
 bool ItaniumCXXABI::EmitBadCastCall(CodeGenFunction &CGF) {
-  llvm::Value *Fn = getBadCastFn(CGF);
+  llvm::FunctionCallee Fn = getBadCastFn(CGF);
   llvm::CallBase *Call = CGF.EmitRuntimeCallOrInvoke(Fn);
   Call->setDoesNotReturn();
   CGF.Builder.CreateUnreachable();
   return true;
 }
 
 llvm::Value *
 ItaniumCXXABI::GetVirtualBaseClassOffset(CodeGenFunction &CGF,
Address ItaniumCXXABI::InitializeArrayCookie(CodeGenFunction &CGF,
   // Handle the array cookie specially in ASan.
   if (CGM.getLangOpts().Sanitize.has(SanitizerKind::Address) && AS == 0 &&
       (expr->getOperatorNew()->isReplaceableGlobalAllocationFunction() ||
        CGM.getCodeGenOpts().SanitizeAddressPoisonCustomArrayCookie)) {
     // The store to the CookiePtr does not need to be instrumented.
     CGM.getSanitizerMetadata()->disableSanitizerForInstruction(SI);
     llvm::FunctionType *FTy =
         llvm::FunctionType::get(CGM.VoidTy, NumElementsPtr.getType(), false);
-    llvm::Constant *F =
+    llvm::FunctionCallee F =
         CGM.CreateRuntimeFunction(FTy, "__asan_poison_cxx_array_cookie");
     CGF.Builder.CreateCall(F, NumElementsPtr.getPointer());
   }
 
   // Finally, compute a pointer to the actual data buffer by skipping
   // over the cookie completely.
   return CGF.Builder.CreateConstInBoundsByteGEP(NewPtr, CookieSize);
 }
if (!CGM.getLangOpts().Sanitize.has(SanitizerKind::Address) || AS != 0)
     return CGF.Builder.CreateLoad(numElementsPtr);
   // In asan mode emit a function call instead of a regular load and let the
   // run-time deal with it: if the shadow is properly poisoned return the
   // cookie, otherwise return 0 to avoid an infinite loop calling DTORs.
   // We can't simply ignore this load using nosanitize metadata because
   // the metadata may be lost.
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(CGF.SizeTy, CGF.SizeTy->getPointerTo(0), false);
-  llvm::Constant *F =
+  llvm::FunctionCallee F =
       CGM.CreateRuntimeFunction(FTy, "__asan_load_cxx_array_cookie");
   return CGF.Builder.CreateCall(F, numElementsPtr.getPointer());
 }
 
 CharUnits ARMCXXABI::getArrayCookieSizeImpl(QualType elementType) {
   // ARM says that the cookie is always:
   //   struct array_cookie {
   //     std::size_t element_size; // element_size != 0
Address numElementsPtr
     = CGF.Builder.CreateConstInBoundsByteGEP(allocPtr, CGF.getSizeSize());
 
   numElementsPtr = CGF.Builder.CreateElementBitCast(numElementsPtr, CGF.SizeTy);
   return CGF.Builder.CreateLoad(numElementsPtr);
 }
 
 /*********************** Static local initialization **************************/
 
-static llvm::Constant *getGuardAcquireFn(CodeGenModule &CGM,
+static llvm::FunctionCallee getGuardAcquireFn(CodeGenModule &CGM,
                                               llvm::PointerType *GuardPtrTy) {
   // int __cxa_guard_acquire(__guard *guard_object);
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.getTypes().ConvertType(CGM.getContext().IntTy),
                             GuardPtrTy, /*isVarArg=*/false);
   return CGM.CreateRuntimeFunction(
       FTy, "__cxa_guard_acquire",
       llvm::AttributeList::get(CGM.getLLVMContext(),
                                llvm::AttributeList::FunctionIndex,
                                llvm::Attribute::NoUnwind));
 }
 
-static llvm::Constant *getGuardReleaseFn(CodeGenModule &CGM,
+static llvm::FunctionCallee getGuardReleaseFn(CodeGenModule &CGM,
                                               llvm::PointerType *GuardPtrTy) {
   // void __cxa_guard_release(__guard *guard_object);
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.VoidTy, GuardPtrTy, /*isVarArg=*/false);
   return CGM.CreateRuntimeFunction(
       FTy, "__cxa_guard_release",
       llvm::AttributeList::get(CGM.getLLVMContext(),
                                llvm::AttributeList::FunctionIndex,
                                llvm::Attribute::NoUnwind));
 }
 
-static llvm::Constant *getGuardAbortFn(CodeGenModule &CGM,
+static llvm::FunctionCallee getGuardAbortFn(CodeGenModule &CGM,
                                             llvm::PointerType *GuardPtrTy) {
   // void __cxa_guard_abort(__guard *guard_object);
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(CGM.VoidTy, GuardPtrTy, /*isVarArg=*/false);
   return CGM.CreateRuntimeFunction(
       FTy, "__cxa_guard_abort",
       llvm::AttributeList::get(CGM.getLLVMContext(),
                                llvm::AttributeList::FunctionIndex,
                                llvm::Attribute::NoUnwind));
llvm::Type *dtorTy =
     llvm::FunctionType::get(CGF.VoidTy, CGF.Int8PtrTy, false)->getPointerTo();
 
   // extern "C" int __cxa_atexit(void (*f)(void *), void *p, void *d);
   llvm::Type *paramTys[] = { dtorTy, CGF.Int8PtrTy, CGF.Int8PtrTy };
   llvm::FunctionType *atexitTy =
     llvm::FunctionType::get(CGF.IntTy, paramTys, false);
 
   // Fetch the actual function.
-  llvm::Constant *atexit = CGF.CGM.CreateRuntimeFunction(atexitTy, Name);
-  if (llvm::Function *fn = dyn_cast<llvm::Function>(atexit))
+  llvm::FunctionCallee atexit = CGF.CGM.CreateRuntimeFunction(atexitTy, Name);
+  if (llvm::Function *fn = dyn_cast<llvm::Function>(atexit.getCallee()))
     fn->setDoesNotThrow();
 
   // Create a variable that binds the atexit to this shared object.
   llvm::Constant *handle =
       CGF.CGM.CreateRuntimeVariable(CGF.Int8Ty, "__dso_handle");
   auto *GV = cast<llvm::GlobalValue>(handle->stripPointerCasts());
   GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
 
else
       getMangleContext().mangleCXXCtorComdat(CD, Out);
     llvm::Comdat *C = CGM.getModule().getOrInsertComdat(Out.str());
     Fn->setComdat(C);
   } else {
     CGM.maybeSetTrivialComdat(*MD, *Fn);
   }
 }
 
-static llvm::Constant *getBeginCatchFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getBeginCatchFn(CodeGenModule &CGM) {
   // void *__cxa_begin_catch(void*);
   llvm::FunctionType *FTy = llvm::FunctionType::get(
       CGM.Int8PtrTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_begin_catch");
 }
 
-static llvm::Constant *getEndCatchFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getEndCatchFn(CodeGenModule &CGM) {
   // void __cxa_end_catch();
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(CGM.VoidTy, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_end_catch");
 }
 
-static llvm::Constant *getGetExceptionPtrFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getGetExceptionPtrFn(CodeGenModule &CGM) {
   // void *__cxa_get_exception_ptr(void*);
   llvm::FunctionType *FTy = llvm::FunctionType::get(
       CGM.Int8PtrTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_get_exception_ptr");
 }
 
 namespace {
void ItaniumCXXABI::emitBeginCatch(CodeGenFunction &CGF,
   CodeGenFunction::AutoVarEmission var = CGF.EmitAutoVarAlloca(*CatchParam);
   InitCatchParam(CGF, *CatchParam, var.getObjectAddress(CGF), S->getBeginLoc());
   CGF.EmitAutoVarCleanups(var);
 }
 
 /// Get or define the following function:
 ///   void @__clang_call_terminate(i8* %exn) nounwind noreturn
 /// This code is used only in C++.
-static llvm::Constant *getClangCallTerminateFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getClangCallTerminateFn(CodeGenModule &CGM) {
   llvm::FunctionType *fnTy =
     llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
-  llvm::Constant *fnRef = CGM.CreateRuntimeFunction(
-      fnTy, "__clang_call_terminate", llvm::AttributeList(), /*Local=*/true);
-
-  llvm::Function *fn = dyn_cast<llvm::Function>(fnRef);
-  if (fn && fn->empty()) {
+  llvm::FunctionCallee fnRef = CGM.CreateRuntimeFunction(
+      fnTy, "__clang_call_terminate", llvm::AttributeList(), /*IsLocal=*/true);
+  llvm::Function *fn =
+      cast<llvm::Function>(fnRef.getCallee()->stripPointerCasts());
+  if (fn->empty()) {
     fn->setDoesNotThrow();
     fn->setDoesNotReturn();
 
     // What we really want is to massively penalize inlining without
     // forbidding it completely.  The difference between that and
     // 'noinline' is negligible.
     fn->addFnAttr(llvm::Attribute::NoInline);
 
     // Allow this function to be shared across translation units, but
     // we don't want it to turn into an exported symbol.
     fn->setLinkage(llvm::Function::LinkOnceODRLinkage);
     fn->setVisibility(llvm::Function::HiddenVisibility);
     if (CGM.supportsCOMDAT())
       fn->setComdat(CGM.getModule().getOrInsertComdat(fn->getName()));
 
     // Set up the function.
     llvm::BasicBlock *entry =
         llvm::BasicBlock::Create(CGM.getLLVMContext(), "", fn);
     CGBuilderTy builder(CGM, entry);
 
     // Pull the exception pointer out of the parameter list.
     llvm::Value *exn = &*fn->arg_begin();
 
     // Call __cxa_begin_catch(exn).
     llvm::CallInst *catchCall = builder.CreateCall(getBeginCatchFn(CGM), exn);
     catchCall->setDoesNotThrow();
     catchCall->setCallingConv(CGM.getRuntimeCC());
 
     // Call std::terminate().
     llvm::CallInst *termCall = builder.CreateCall(CGM.getTerminateFn());
     termCall->setDoesNotThrow();
     termCall->setDoesNotReturn();
     termCall->setCallingConv(CGM.getRuntimeCC());
 
     // std::terminate cannot return.
     builder.CreateUnreachable();
   }
-
   return fnRef;
 }
 
 llvm::CallInst *
 ItaniumCXXABI::emitTerminateForUnexpectedException(CodeGenFunction &CGF,
                                                    llvm::Value *Exn) {
   // In C++, we want to call __cxa_begin_catch() before terminating.
   if (Exn) {

lib/CodeGen/MicrosoftCXXABI.cpp

llvm::Type *FieldTypes[] = {
         getImageRelativeType(CGM.Int8PtrTy), // ForwardCompat
         getImageRelativeType(CGM.Int8PtrTy)  // CatchableTypeArray
     };
     ThrowInfoType = llvm::StructType::create(CGM.getLLVMContext(), FieldTypes,
                                              "eh.ThrowInfo");
     return ThrowInfoType;
   }
 
-  llvm::Constant *getThrowFn() {
+  llvm::FunctionCallee getThrowFn() {
     // _CxxThrowException is passed an exception object and a ThrowInfo object
     // which describes the exception.
     llvm::Type *Args[] = {CGM.Int8PtrTy, getThrowInfoType()->getPointerTo()};
     llvm::FunctionType *FTy =
         llvm::FunctionType::get(CGM.VoidTy, Args, /*IsVarArgs=*/false);
-    auto *Fn = cast<llvm::Function>(
-        CGM.CreateRuntimeFunction(FTy, "_CxxThrowException"));
+    llvm::FunctionCallee Throw =
+        CGM.CreateRuntimeFunction(FTy, "_CxxThrowException");
     // _CxxThrowException is stdcall on 32-bit x86 platforms.
-    if (CGM.getTarget().getTriple().getArch() == llvm::Triple::x86)
+    if (CGM.getTarget().getTriple().getArch() == llvm::Triple::x86) {
+      if (auto *Fn = cast<llvm::Function>(Throw.getCallee()))
         Fn->setCallingConv(llvm::CallingConv::X86_StdCall);
-    return Fn;
+    }
+    return Throw;
   }
 
   llvm::Function *getAddrOfCXXCtorClosure(const CXXConstructorDecl *CD,
                                           CXXCtorType CT);
 
   llvm::Constant *getCatchableType(QualType T,
                                    uint32_t NVOffset = 0,
                                    int32_t VBPtrOffset = -1,
void MicrosoftCXXABI::emitVirtualObjectDelete(CodeGenFunction &CGF,
   if (UseGlobalDelete)
     CGF.EmitDeleteCall(DE->getOperatorDelete(), MDThis, ElementType);
 }
 
 void MicrosoftCXXABI::emitRethrow(CodeGenFunction &CGF, bool isNoReturn) {
   llvm::Value *Args[] = {
       llvm::ConstantPointerNull::get(CGM.Int8PtrTy),
       llvm::ConstantPointerNull::get(getThrowInfoType()->getPointerTo())};
-  auto *Fn = getThrowFn();
+  llvm::FunctionCallee Fn = getThrowFn();
   if (isNoReturn)
     CGF.EmitNoreturnRuntimeCallOrInvoke(Fn, Args);
   else
     CGF.EmitRuntimeCallOrInvoke(Fn, Args);
 }
 
 void MicrosoftCXXABI::emitBeginCatch(CodeGenFunction &CGF,
                                      const CXXCatchStmt *S) {

 }
 
 static llvm::CallBase *emitRTtypeidCall(CodeGenFunction &CGF,
                                         llvm::Value *Argument) {
   llvm::Type *ArgTypes[] = {CGF.Int8PtrTy};
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false);
   llvm::Value *Args[] = {Argument};
-  llvm::Constant *Fn = CGF.CGM.CreateRuntimeFunction(FTy, "__RTtypeid");
+  llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(FTy, "__RTtypeid");
   return CGF.EmitRuntimeCallOrInvoke(Fn, Args);
 }
 
 void MicrosoftCXXABI::EmitBadTypeidCall(CodeGenFunction &CGF) {
   llvm::CallBase *Call =
       emitRTtypeidCall(CGF, llvm::Constant::getNullValue(CGM.VoidPtrTy));
   Call->setDoesNotReturn();
   CGF.Builder.CreateUnreachable();
llvm::Value *MicrosoftCXXABI::EmitDynamicCastCall(
   // PVOID __RTDynamicCast(
   //   PVOID inptr,
   //   LONG VfDelta,
   //   PVOID SrcType,
   //   PVOID TargetType,
   //   BOOL isReference)
   llvm::Type *ArgTypes[] = {CGF.Int8PtrTy, CGF.Int32Ty, CGF.Int8PtrTy,
                             CGF.Int8PtrTy, CGF.Int32Ty};
-  llvm::Constant *Function = CGF.CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee Function = CGF.CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false),
       "__RTDynamicCast");
   llvm::Value *Args[] = {
       ThisPtr, Offset, SrcRTTI, DestRTTI,
       llvm::ConstantInt::get(CGF.Int32Ty, DestTy->isReferenceType())};
   ThisPtr = CGF.EmitRuntimeCallOrInvoke(Function, Args);
   return CGF.Builder.CreateBitCast(ThisPtr, DestLTy);
 }
 
 llvm::Value *
 MicrosoftCXXABI::EmitDynamicCastToVoid(CodeGenFunction &CGF, Address Value,
                                        QualType SrcRecordTy,
                                        QualType DestTy) {
   std::tie(Value, std::ignore, std::ignore) =
       performBaseAdjustment(CGF, Value, SrcRecordTy);
 
   // PVOID __RTCastToVoid(
   //   PVOID inptr)
   llvm::Type *ArgTypes[] = {CGF.Int8PtrTy};
-  llvm::Constant *Function = CGF.CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee Function = CGF.CGM.CreateRuntimeFunction(
       llvm::FunctionType::get(CGF.Int8PtrTy, ArgTypes, false),
       "__RTCastToVoid");
   llvm::Value *Args[] = {Value.getPointer()};
   return CGF.EmitRuntimeCall(Function, Args);
 }
 
 bool MicrosoftCXXABI::EmitBadCastCall(CodeGenFunction &CGF) {
   return false;
static void emitGlobalDtorWithTLRegDtor(CodeGenFunction &CGF, const VarDecl &VD,
                                         llvm::Constant *Addr) {
   // Create a function which calls the destructor.
   llvm::Constant *DtorStub = CGF.createAtExitStub(VD, Dtor, Addr);
 
   // extern "C" int __tlregdtor(void (*f)(void));
   llvm::FunctionType *TLRegDtorTy = llvm::FunctionType::get(
       CGF.IntTy, DtorStub->getType(), /*IsVarArg=*/false);
 
-  llvm::Constant *TLRegDtor = CGF.CGM.CreateRuntimeFunction(
+  llvm::FunctionCallee TLRegDtor = CGF.CGM.CreateRuntimeFunction(
       TLRegDtorTy, "__tlregdtor", llvm::AttributeList(), /*Local=*/true);
-  if (llvm::Function *TLRegDtorFn = dyn_cast<llvm::Function>(TLRegDtor))
+  if (llvm::Function *TLRegDtorFn =
+          dyn_cast<llvm::Function>(TLRegDtor.getCallee()))
     TLRegDtorFn->setDoesNotThrow();
 
   CGF.EmitNounwindRuntimeCall(TLRegDtor, DtorStub);
 }
 
 void MicrosoftCXXABI::registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
                                          llvm::Constant *Dtor,
                                          llvm::Constant *Addr) {
auto *GV = new llvm::GlobalVariable(
       CGM.getModule(), CGM.IntTy,
       /*Constant=*/false, llvm::GlobalVariable::ExternalLinkage,
       /*Initializer=*/nullptr, VarName,
       /*InsertBefore=*/nullptr, llvm::GlobalVariable::GeneralDynamicTLSModel);
   GV->setAlignment(Align.getQuantity());
   return ConstantAddress(GV, Align);
 }
 
-static llvm::Constant *getInitThreadHeaderFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getInitThreadHeaderFn(CodeGenModule &CGM) {
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
                               CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
   return CGM.CreateRuntimeFunction(
       FTy, "_Init_thread_header",
       llvm::AttributeList::get(CGM.getLLVMContext(),
                                llvm::AttributeList::FunctionIndex,
                                llvm::Attribute::NoUnwind),
       /*Local=*/true);
 }
 
-static llvm::Constant *getInitThreadFooterFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getInitThreadFooterFn(CodeGenModule &CGM) {
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
                               CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
   return CGM.CreateRuntimeFunction(
       FTy, "_Init_thread_footer",
       llvm::AttributeList::get(CGM.getLLVMContext(),
                                llvm::AttributeList::FunctionIndex,
                                llvm::Attribute::NoUnwind),
       /*Local=*/true);
 }
 
-static llvm::Constant *getInitThreadAbortFn(CodeGenModule &CGM) {
+static llvm::FunctionCallee getInitThreadAbortFn(CodeGenModule &CGM) {
   llvm::FunctionType *FTy =
       llvm::FunctionType::get(llvm::Type::getVoidTy(CGM.getLLVMContext()),
                               CGM.IntTy->getPointerTo(), /*isVarArg=*/false);
   return CGM.CreateRuntimeFunction(
       FTy, "_Init_thread_abort",
       llvm::AttributeList::get(CGM.getLLVMContext(),
                                llvm::AttributeList::FunctionIndex,
                                llvm::Attribute::NoUnwind),