Teach ARM va_arg to ignore empty structs.
Empty structs are ignored for parameter passing purposes, but va_arg was
incrementing the pointer anyway which could lead to va_list getting out of
sync.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184605 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
index c9f0d75..bef0d05 100644
--- a/lib/CodeGen/TargetInfo.cpp
+++ b/lib/CodeGen/TargetInfo.cpp
@@ -3593,6 +3593,12 @@
llvm::Value *VAListAddrAsBPP = Builder.CreateBitCast(VAListAddr, BPP, "ap");
llvm::Value *Addr = Builder.CreateLoad(VAListAddrAsBPP, "ap.cur");
+ if (isEmptyRecord(getContext(), Ty, true)) {
+ // These are ignored for parameter passing purposes.
+ llvm::Type *PTy = llvm::PointerType::getUnqual(CGF.ConvertType(Ty));
+ return Builder.CreateBitCast(Addr, PTy);
+ }
+
uint64_t Size = CGF.getContext().getTypeSize(Ty) / 8;
uint64_t TyAlign = CGF.getContext().getTypeAlign(Ty) / 8;
bool IsIndirect = false;