namespace llvm {
- /// getPointerUnionTypeNum - If the argument has type PT1* or PT2* return
- /// false or true respectively.
- template <typename PT1, typename PT2>
- static inline int getPointerUnionTypeNum(PT1 *P) { return 0; }
- template <typename PT1, typename PT2>
- static inline int getPointerUnionTypeNum(PT2 *P) { return 1; }
- template <typename PT1, typename PT2>
- static inline int getPointerUnionTypeNum(...) { return -1; }
-
-
+ template <typename T>
+ struct PointerUnionTypeSelectorReturn {
+ typedef T Return;
+ };
+
+ /// \brief Get a type based on whether two types are the same or not. For:
+ /// @code
+ /// typedef typename PointerUnionTypeSelector<T1, T2, EQ, NE>::Return Ret;
+ /// @endcode
+ /// Ret will be EQ type if T1 is same as T2 or NE type otherwise.
+ template <typename T1, typename T2, typename RET_EQ, typename RET_NE>
+ struct PointerUnionTypeSelector {
+ typedef typename PointerUnionTypeSelectorReturn<RET_NE>::Return Return;
+ };
+
+ template <typename T, typename RET_EQ, typename RET_NE>
+ struct PointerUnionTypeSelector<T, T, RET_EQ, RET_NE> {
+ typedef typename PointerUnionTypeSelectorReturn<RET_EQ>::Return Return;
+ };
+
+ template <typename T1, typename T2, typename RET_EQ, typename RET_NE>
+ struct PointerUnionTypeSelectorReturn<
+ PointerUnionTypeSelector<T1, T2, RET_EQ, RET_NE> > {
+ typedef typename PointerUnionTypeSelector<T1, T2, RET_EQ, RET_NE>::Return
+ Return;
+ };
+
/// Provide PointerLikeTypeTraits for void* that is used by PointerUnion
/// for the two template arguments.
template <typename PT1, typename PT2>
static inline void *getAsVoidPointer(void *P) { return P; }
static inline void *getFromVoidPointer(void *P) { return P; }
enum {
- PT1BitsAv = PointerLikeTypeTraits<PT1>::NumLowBitsAvailable,
- PT2BitsAv = PointerLikeTypeTraits<PT2>::NumLowBitsAvailable,
+ PT1BitsAv = (int)(PointerLikeTypeTraits<PT1>::NumLowBitsAvailable),
+ PT2BitsAv = (int)(PointerLikeTypeTraits<PT2>::NumLowBitsAvailable),
NumLowBitsAvailable = PT1BitsAv < PT2BitsAv ? PT1BitsAv : PT2BitsAv
};
};
PointerUnionUIntTraits<PT1,PT2> > ValTy;
private:
ValTy Val;
+
+ struct IsPT1 {
+ static const int Num = 0;
+ };
+ struct IsPT2 {
+ static const int Num = 1;
+ };
+ template <typename T>
+ struct UNION_DOESNT_CONTAIN_TYPE { };
+
public:
PointerUnion() {}
/// isNull - Return true if the pointer held in the union is null,
/// regardless of which type it is.
- bool isNull() const { return Val.getPointer() == 0; }
+ bool isNull() const {
+ // Convert from the void* to one of the pointer types, to make sure that
+ // we recursively strip off low bits if we have a nested PointerUnion.
+ return !PointerLikeTypeTraits<PT1>::getFromVoidPointer(Val.getPointer());
+ }
operator bool() const { return !isNull(); }
/// is<T>() return true if the Union currently holds the type matching T.
template<typename T>
int is() const {
- int TyNo = ::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0);
- assert(TyNo != -1 && "Type query could never succeed on PointerUnion!");
+ typedef typename
+ ::llvm::PointerUnionTypeSelector<PT1, T, IsPT1,
+ ::llvm::PointerUnionTypeSelector<PT2, T, IsPT2,
+ UNION_DOESNT_CONTAIN_TYPE<T> > >::Return Ty;
+ int TyNo = Ty::Num;
return static_cast<int>(Val.getInt()) == TyNo;
}
return T();
}
- /// \brief If the union is set to the first pointer type we can get an
- /// address pointing to it.
- template <typename T>
- PT1 const *getAddrOf() const {
+ /// \brief If the union is set to the first pointer type get an address
+ /// pointing to it.
+ PT1 const *getAddrOfPtr1() const {
+ return const_cast<PointerUnion *>(this)->getAddrOfPtr1();
+ }
+
+ /// \brief If the union is set to the first pointer type get an address
+ /// pointing to it.
+ PT1 *getAddrOfPtr1() {
assert(is<PT1>() && "Val is not the first pointer");
assert(get<PT1>() == Val.getPointer() &&
"Can't get the address because PointerLikeTypeTraits changes the ptr");
- T const *can_only_get_address_of_first_pointer_type
- = reinterpret_cast<PT1 const *>(Val.getAddrOfPointer());
- return can_only_get_address_of_first_pointer_type;
+ return (PT1 *)Val.getAddrOfPointer();
}
/// Assignment operators - Allow assigning into this union from either
typedef PointerUnion<InnerUnion, PT3> ValTy;
private:
ValTy Val;
+
+ struct IsInnerUnion {
+ ValTy Val;
+ IsInnerUnion(ValTy val) : Val(val) { }
+ template<typename T>
+ int is() const {
+ return Val.template is<InnerUnion>() &&
+ Val.template get<InnerUnion>().template is<T>();
+ }
+ template<typename T>
+ T get() const {
+ return Val.template get<InnerUnion>().template get<T>();
+ }
+ };
+
+ struct IsPT3 {
+ ValTy Val;
+ IsPT3(ValTy val) : Val(val) { }
+ template<typename T>
+ int is() const {
+ return Val.template is<T>();
+ }
+ template<typename T>
+ T get() const {
+ return Val.template get<T>();
+ }
+ };
+
public:
PointerUnion3() {}
/// is<T>() return true if the Union currently holds the type matching T.
template<typename T>
int is() const {
- // Is it PT1/PT2?
- if (::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0) != -1)
- return Val.template is<InnerUnion>() &&
- Val.template get<InnerUnion>().template is<T>();
- return Val.template is<T>();
+ // If T is PT1/PT2 choose IsInnerUnion otherwise choose IsPT3.
+ typedef typename
+ ::llvm::PointerUnionTypeSelector<PT1, T, IsInnerUnion,
+ ::llvm::PointerUnionTypeSelector<PT2, T, IsInnerUnion, IsPT3 >
+ >::Return Ty;
+ return Ty(Val).template is<T>();
}
/// get<T>() - Return the value of the specified pointer type. If the
template<typename T>
T get() const {
assert(is<T>() && "Invalid accessor called");
- // Is it PT1/PT2?
- if (::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0) != -1)
- return Val.template get<InnerUnion>().template get<T>();
-
- return Val.template get<T>();
+ // If T is PT1/PT2 choose IsInnerUnion otherwise choose IsPT3.
+ typedef typename
+ ::llvm::PointerUnionTypeSelector<PT1, T, IsInnerUnion,
+ ::llvm::PointerUnionTypeSelector<PT2, T, IsInnerUnion, IsPT3 >
+ >::Return Ty;
+ return Ty(Val).template get<T>();
}
/// dyn_cast<T>() - If the current value is of the specified pointer type,
/// is<T>() return true if the Union currently holds the type matching T.
template<typename T>
int is() const {
- // Is it PT1/PT2?
- if (::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0) != -1)
- return Val.template is<InnerUnion1>() &&
- Val.template get<InnerUnion1>().template is<T>();
- return Val.template is<InnerUnion2>() &&
- Val.template get<InnerUnion2>().template is<T>();
+ // If T is PT1/PT2 choose InnerUnion1 otherwise choose InnerUnion2.
+ typedef typename
+ ::llvm::PointerUnionTypeSelector<PT1, T, InnerUnion1,
+ ::llvm::PointerUnionTypeSelector<PT2, T, InnerUnion1, InnerUnion2 >
+ >::Return Ty;
+ return Val.template is<Ty>() &&
+ Val.template get<Ty>().template is<T>();
}
/// get<T>() - Return the value of the specified pointer type. If the
template<typename T>
T get() const {
assert(is<T>() && "Invalid accessor called");
- // Is it PT1/PT2?
- if (::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0) != -1)
- return Val.template get<InnerUnion1>().template get<T>();
-
- return Val.template get<InnerUnion2>().template get<T>();
+ // If T is PT1/PT2 choose InnerUnion1 otherwise choose InnerUnion2.
+ typedef typename
+ ::llvm::PointerUnionTypeSelector<PT1, T, InnerUnion1,
+ ::llvm::PointerUnionTypeSelector<PT2, T, InnerUnion1, InnerUnion2 >
+ >::Return Ty;
+ return Val.template get<Ty>().template get<T>();
}
/// dyn_cast<T>() - If the current value is of the specified pointer type,
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