#if LLVM_VERSION < 30

 #define constType const Type
 #define constArrayType const ArrayType
 #define constStructType const StructType
 #define constPointerType const PointerType
 #define constFunctionType const FunctionType
 #define ARRAYREF(t,a,b) (a),(b)
 #define ARRAYREFPARAM(t,a,b,n) a, b
 #define ARRAYREFP(a,b,n) a, b
 #define ARRAYREFVECTOR(t,a) (a).begin(),(a).end()
 #define HINT(n)
 #define OPT(n)

 #else
 #define constType Type
 #define constArrayType ArrayType
 #define constStructType StructType
 #define constPointerType PointerType
 #define constFunctionType FunctionType
 #define ARRAYREF(t,a,b) ArrayRef<t>(a,b)
 #define ARRAYREFPARAM(t,a,b,n) ArrayRef<t> n
 #define ARRAYREFP(a,b,n) n
 #define ARRAYREFVECTOR(t,a) ArrayRef<t>(a)
 #define HINT(n) n,
 #define OPT(n) ,n

 #endif