namespace llvm {
- template <typename T>
- struct PointerUnionTypeSelectorReturn {
- typedef T Return;
+template <typename T> struct PointerUnionTypeSelectorReturn {
+ typedef T Return;
+};
+
+/// 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> class PointerUnionUIntTraits {
+public:
+ static inline void *getAsVoidPointer(void *P) { return P; }
+ static inline void *getFromVoidPointer(void *P) { return P; }
+ enum {
+ PT1BitsAv = (int)(PointerLikeTypeTraits<PT1>::NumLowBitsAvailable),
+ PT2BitsAv = (int)(PointerLikeTypeTraits<PT2>::NumLowBitsAvailable),
+ NumLowBitsAvailable = PT1BitsAv < PT2BitsAv ? PT1BitsAv : PT2BitsAv
};
-
- /// \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;
+};
+
+/// A discriminated union of two pointer types, with the discriminator in the
+/// low bit of the pointer.
+///
+/// This implementation is extremely efficient in space due to leveraging the
+/// low bits of the pointer, while exposing a natural and type-safe API.
+///
+/// Common use patterns would be something like this:
+/// PointerUnion<int*, float*> P;
+/// P = (int*)0;
+/// printf("%d %d", P.is<int*>(), P.is<float*>()); // prints "1 0"
+/// X = P.get<int*>(); // ok.
+/// Y = P.get<float*>(); // runtime assertion failure.
+/// Z = P.get<double*>(); // compile time failure.
+/// P = (float*)0;
+/// Y = P.get<float*>(); // ok.
+/// X = P.get<int*>(); // runtime assertion failure.
+template <typename PT1, typename PT2> class PointerUnion {
+public:
+ typedef PointerIntPair<void *, 1, bool, PointerUnionUIntTraits<PT1, PT2>>
+ ValTy;
+
+private:
+ ValTy Val;
+
+ struct IsPT1 {
+ static const int Num = 0;
};
-
- /// Provide PointerLikeTypeTraits for void* that is used by PointerUnion
- /// for the two template arguments.
- template <typename PT1, typename PT2>
- class PointerUnionUIntTraits {
- public:
- static inline void *getAsVoidPointer(void *P) { return P; }
- static inline void *getFromVoidPointer(void *P) { return P; }
- enum {
- PT1BitsAv = (int)(PointerLikeTypeTraits<PT1>::NumLowBitsAvailable),
- PT2BitsAv = (int)(PointerLikeTypeTraits<PT2>::NumLowBitsAvailable),
- NumLowBitsAvailable = PT1BitsAv < PT2BitsAv ? PT1BitsAv : PT2BitsAv
- };
+ struct IsPT2 {
+ static const int Num = 1;
};
+ template <typename T> struct UNION_DOESNT_CONTAIN_TYPE {};
+
+public:
+ PointerUnion() {}
+
+ PointerUnion(PT1 V)
+ : Val(const_cast<void *>(
+ PointerLikeTypeTraits<PT1>::getAsVoidPointer(V))) {}
+ PointerUnion(PT2 V)
+ : Val(const_cast<void *>(PointerLikeTypeTraits<PT2>::getAsVoidPointer(V)),
+ 1) {}
+
+ /// Test if the pointer held in the union is null, regardless of
+ /// which type it is.
+ 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());
+ }
+ explicit operator bool() const { return !isNull(); }
+
+ /// Test if the Union currently holds the type matching T.
+ template <typename T> int is() const {
+ 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;
+ }
- /// PointerUnion - This implements a discriminated union of two pointer types,
- /// and keeps the discriminator bit-mangled into the low bits of the pointer.
- /// This allows the implementation to be extremely efficient in space, but
- /// permits a very natural and type-safe API.
+ /// Returns the value of the specified pointer type.
///
- /// Common use patterns would be something like this:
- /// PointerUnion<int*, float*> P;
- /// P = (int*)0;
- /// printf("%d %d", P.is<int*>(), P.is<float*>()); // prints "1 0"
- /// X = P.get<int*>(); // ok.
- /// Y = P.get<float*>(); // runtime assertion failure.
- /// Z = P.get<double*>(); // compile time failure.
- /// P = (float*)0;
- /// Y = P.get<float*>(); // ok.
- /// X = P.get<int*>(); // runtime assertion failure.
- template <typename PT1, typename PT2>
- class PointerUnion {
- public:
- typedef PointerIntPair<void*, 1, bool,
- 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() {}
-
- PointerUnion(PT1 V) : Val(
- const_cast<void *>(PointerLikeTypeTraits<PT1>::getAsVoidPointer(V))) {
- }
- PointerUnion(PT2 V) : Val(
- const_cast<void *>(PointerLikeTypeTraits<PT2>::getAsVoidPointer(V)), 1) {
- }
-
- /// isNull - Return true if the pointer held in the union is null,
- /// regardless of which type it is.
- 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());
- }
- explicit operator bool() const { return !isNull(); }
-
- /// is<T>() return true if the Union currently holds the type matching T.
- template<typename T>
- int is() const {
- 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;
- }
-
- /// get<T>() - Return the value of the specified pointer type. If the
- /// specified pointer type is incorrect, assert.
- template<typename T>
- T get() const {
- assert(is<T>() && "Invalid accessor called");
- return PointerLikeTypeTraits<T>::getFromVoidPointer(Val.getPointer());
- }
+ /// If the specified pointer type is incorrect, assert.
+ template <typename T> T get() const {
+ assert(is<T>() && "Invalid accessor called");
+ return PointerLikeTypeTraits<T>::getFromVoidPointer(Val.getPointer());
+ }
- /// dyn_cast<T>() - If the current value is of the specified pointer type,
- /// return it, otherwise return null.
- template<typename T>
- T dyn_cast() const {
- if (is<T>()) return get<T>();
- return T();
- }
+ /// Returns the current pointer if it is of the specified pointer type,
+ /// otherwises returns null.
+ template <typename T> T dyn_cast() const {
+ if (is<T>())
+ return get<T>();
+ return T();
+ }
- /// \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();
- }
+ /// 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");
- return (PT1 *)Val.getAddrOfPointer();
- }
+ /// 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");
+ return (PT1 *)Val.getAddrOfPointer();
+ }
- /// \brief Assignment from nullptr which just clears the union.
- const PointerUnion &operator=(std::nullptr_t) {
- Val.initWithPointer(nullptr);
- return *this;
- }
+ /// Assignment from nullptr which just clears the union.
+ const PointerUnion &operator=(std::nullptr_t) {
+ Val.initWithPointer(nullptr);
+ return *this;
+ }
- /// Assignment operators - Allow assigning into this union from either
- /// pointer type, setting the discriminator to remember what it came from.
- const PointerUnion &operator=(const PT1 &RHS) {
- Val.initWithPointer(
-
const_cast<void *>(PointerLikeTypeTraits<PT1>::getAsVoidPointer(RHS)));
- return *this;
- }
- const PointerUnion &operator=(const PT2 &RHS) {
- Val.setPointerAndInt(
+ /// Assignment operators - Allow assigning into this union from either
+ /// pointer type, setting the discriminator to remember what it came from.
+ const PointerUnion &operator=(const PT1 &RHS) {
+ Val.initWithPointer(
+ const_cast<void *>(PointerLikeTypeTraits<PT1>::getAsVoidPointer(RHS)));
+ return *this;
+ }
+ const PointerUnion &operator=(const PT2 &RHS) {
+ Val.setPointerAndInt(
const_cast<void *>(PointerLikeTypeTraits<PT2>::getAsVoidPointer(RHS)),
1);
- return *this;
- }
-
- void *getOpaqueValue() const { return Val.getOpaqueValue(); }
- static inline PointerUnion getFromOpaqueValue(void *VP) {
- PointerUnion V;
- V.Val = ValTy::getFromOpaqueValue(VP);
- return V;
- }
- };
-
- template<typename PT1, typename PT2>
- static bool operator==(PointerUnion<PT1, PT2> lhs,
- PointerUnion<PT1, PT2> rhs) {
- return lhs.getOpaqueValue() == rhs.getOpaqueValue();
+ return *this;
}
- template<typename PT1, typename PT2>
- static bool operator!=(PointerUnion<PT1, PT2> lhs,
- PointerUnion<PT1, PT2> rhs) {
- return lhs.getOpaqueValue() != rhs.getOpaqueValue();
+ void *getOpaqueValue() const { return Val.getOpaqueValue(); }
+ static inline PointerUnion getFromOpaqueValue(void *VP) {
+ PointerUnion V;
+ V.Val = ValTy::getFromOpaqueValue(VP);
+ return V;
}
+};
- template<typename PT1, typename PT2>
- static bool operator<(PointerUnion<PT1, PT2> lhs,
- PointerUnion<PT1, PT2> rhs) {
- return lhs.getOpaqueValue() < rhs.getOpaqueValue();
- }
+template <typename PT1, typename PT2>
+static bool operator==(PointerUnion<PT1, PT2> lhs, PointerUnion<PT1, PT2> rhs) {
+ return lhs.getOpaqueValue() == rhs.getOpaqueValue();
+}
- // Teach SmallPtrSet that PointerUnion is "basically a pointer", that has
- // # low bits available = min(PT1bits,PT2bits)-1.
- template<typename PT1, typename PT2>
- class PointerLikeTypeTraits<PointerUnion<PT1, PT2> > {
- public:
- static inline void *
- getAsVoidPointer(const PointerUnion<PT1, PT2> &P) {
- return P.getOpaqueValue();
- }
- static inline PointerUnion<PT1, PT2>
- getFromVoidPointer(void *P) {
- return PointerUnion<PT1, PT2>::getFromOpaqueValue(P);
- }
+template <typename PT1, typename PT2>
+static bool operator!=(PointerUnion<PT1, PT2> lhs, PointerUnion<PT1, PT2> rhs) {
+ return lhs.getOpaqueValue() != rhs.getOpaqueValue();
+}
+
+template <typename PT1, typename PT2>
+static bool operator<(PointerUnion<PT1, PT2> lhs, PointerUnion<PT1, PT2> rhs) {
+ return lhs.getOpaqueValue() < rhs.getOpaqueValue();
+}
+
+// Teach SmallPtrSet that PointerUnion is "basically a pointer", that has
+// # low bits available = min(PT1bits,PT2bits)-1.
+template <typename PT1, typename PT2>
+class PointerLikeTypeTraits<PointerUnion<PT1, PT2>> {
+public:
+ static inline void *getAsVoidPointer(const PointerUnion<PT1, PT2> &P) {
+ return P.getOpaqueValue();
+ }
+ static inline PointerUnion<PT1, PT2> getFromVoidPointer(void *P) {
+ return PointerUnion<PT1, PT2>::getFromOpaqueValue(P);
+ }
- // The number of bits available are the min of the two pointer types.
- enum {
- NumLowBitsAvailable =
- PointerLikeTypeTraits<typename PointerUnion<PT1,PT2>::ValTy>
- ::NumLowBitsAvailable
- };
+ // The number of bits available are the min of the two pointer types.
+ enum {
+ NumLowBitsAvailable = PointerLikeTypeTraits<
+ typename PointerUnion<PT1, PT2>::ValTy>::NumLowBitsAvailable
};
+};
+/// A pointer union of three pointer types. See documentation for PointerUnion
+/// for usage.
+template <typename PT1, typename PT2, typename PT3> class PointerUnion3 {
+public:
+ typedef PointerUnion<PT1, PT2> InnerUnion;
+ typedef PointerUnion<InnerUnion, PT3> ValTy;
- /// PointerUnion3 - This is a pointer union of three pointer types. See
- /// documentation for PointerUnion for usage.
- template <typename PT1, typename PT2, typename PT3>
- class PointerUnion3 {
- public:
- typedef PointerUnion<PT1, PT2> InnerUnion;
- typedef PointerUnion<InnerUnion, PT3> ValTy;
- private:
- ValTy Val;
+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() {}
-
- PointerUnion3(PT1 V) {
- Val = InnerUnion(V);
- }
- PointerUnion3(PT2 V) {
- Val = InnerUnion(V);
+ 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>();
}
- PointerUnion3(PT3 V) {
- Val = V;
+ template <typename T> T get() const {
+ return Val.template get<InnerUnion>().template get<T>();
}
+ };
- /// isNull - Return true if the pointer held in the union is null,
- /// regardless of which type it is.
- bool isNull() const { return Val.isNull(); }
- explicit operator bool() const { return !isNull(); }
-
- /// is<T>() return true if the Union currently holds the type matching T.
- template<typename T>
- int is() const {
- // 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>();
- }
+ 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>(); }
+ };
- /// get<T>() - Return the value of the specified pointer type. If the
- /// specified pointer type is incorrect, assert.
- template<typename T>
- T get() const {
- assert(is<T>() && "Invalid accessor called");
- // 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>();
- }
+public:
+ PointerUnion3() {}
+
+ PointerUnion3(PT1 V) { Val = InnerUnion(V); }
+ PointerUnion3(PT2 V) { Val = InnerUnion(V); }
+ PointerUnion3(PT3 V) { Val = V; }
+
+ /// Test if the pointer held in the union is null, regardless of
+ /// which type it is.
+ bool isNull() const { return Val.isNull(); }
+ explicit operator bool() const { return !isNull(); }
+
+ /// Test if the Union currently holds the type matching T.
+ template <typename T> int is() const {
+ // 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>();
+ }
- /// dyn_cast<T>() - If the current value is of the specified pointer type,
- /// return it, otherwise return null.
- template<typename T>
- T dyn_cast() const {
- if (is<T>()) return get<T>();
- return T();
- }
+ /// Returns the value of the specified pointer type.
+ ///
+ /// If the specified pointer type is incorrect, assert.
+ template <typename T> T get() const {
+ assert(is<T>() && "Invalid accessor called");
+ // 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>();
+ }
- /// \brief Assignment from nullptr which just clears the union.
- const PointerUnion3 &operator=(std::nullptr_t) {
- Val = nullptr;
- return *this;
- }
+ /// Returns the current pointer if it is of the specified pointer type,
+ /// otherwises returns null.
+ template <typename T> T dyn_cast() const {
+ if (is<T>())
+ return get<T>();
+ return T();
+ }
- /// Assignment operators - Allow assigning into this union from either
- /// pointer type, setting the discriminator to remember what it came from.
- const PointerUnion3 &operator=(const PT1 &RHS) {
- Val = InnerUnion(RHS);
- return *this;
- }
- const PointerUnion3 &operator=(const PT2 &RHS) {
- Val = InnerUnion(RHS);
- return *this;
- }
- const PointerUnion3 &operator=(const PT3 &RHS) {
- Val = RHS;
- return *this;
- }
+ /// Assignment from nullptr which just clears the union.
+ const PointerUnion3 &operator=(std::nullptr_t) {
+ Val = nullptr;
+ return *this;
+ }
- void *getOpaqueValue() const { return Val.getOpaqueValue(); }
- static inline PointerUnion3 getFromOpaqueValue(void *VP) {
- PointerUnion3 V;
- V.Val = ValTy::getFromOpaqueValue(VP);
- return V;
- }
- };
+ /// Assignment operators - Allow assigning into this union from either
+ /// pointer type, setting the discriminator to remember what it came from.
+ const PointerUnion3 &operator=(const PT1 &RHS) {
+ Val = InnerUnion(RHS);
+ return *this;
+ }
+ const PointerUnion3 &operator=(const PT2 &RHS) {
+ Val = InnerUnion(RHS);
+ return *this;
+ }
+ const PointerUnion3 &operator=(const PT3 &RHS) {
+ Val = RHS;
+ return *this;
+ }
- // Teach SmallPtrSet that PointerUnion3 is "basically a pointer", that has
- // # low bits available = min(PT1bits,PT2bits,PT2bits)-2.
- template<typename PT1, typename PT2, typename PT3>
- class PointerLikeTypeTraits<PointerUnion3<PT1, PT2, PT3> > {
- public:
- static inline void *
- getAsVoidPointer(const PointerUnion3<PT1, PT2, PT3> &P) {
- return P.getOpaqueValue();
- }
- static inline PointerUnion3<PT1, PT2, PT3>
- getFromVoidPointer(void *P) {
- return PointerUnion3<PT1, PT2, PT3>::getFromOpaqueValue(P);
- }
+ void *getOpaqueValue() const { return Val.getOpaqueValue(); }
+ static inline PointerUnion3 getFromOpaqueValue(void *VP) {
+ PointerUnion3 V;
+ V.Val = ValTy::getFromOpaqueValue(VP);
+ return V;
+ }
+};
+
+// Teach SmallPtrSet that PointerUnion3 is "basically a pointer", that has
+// # low bits available = min(PT1bits,PT2bits,PT2bits)-2.
+template <typename PT1, typename PT2, typename PT3>
+class PointerLikeTypeTraits<PointerUnion3<PT1, PT2, PT3>> {
+public:
+ static inline void *getAsVoidPointer(const PointerUnion3<PT1, PT2, PT3> &P) {
+ return P.getOpaqueValue();
+ }
+ static inline PointerUnion3<PT1, PT2, PT3> getFromVoidPointer(void *P) {
+ return PointerUnion3<PT1, PT2, PT3>::getFromOpaqueValue(P);
+ }
- // The number of bits available are the min of the two pointer types.
- enum {
- NumLowBitsAvailable =
- PointerLikeTypeTraits<typename PointerUnion3<PT1, PT2, PT3>::ValTy>
- ::NumLowBitsAvailable
- };
+ // The number of bits available are the min of the two pointer types.
+ enum {
+ NumLowBitsAvailable = PointerLikeTypeTraits<
+ typename PointerUnion3<PT1, PT2, PT3>::ValTy>::NumLowBitsAvailable
};
+};
+
+/// A pointer union of four pointer types. See documentation for PointerUnion
+/// for usage.
+template <typename PT1, typename PT2, typename PT3, typename PT4>
+class PointerUnion4 {
+public:
+ typedef PointerUnion<PT1, PT2> InnerUnion1;
+ typedef PointerUnion<PT3, PT4> InnerUnion2;
+ typedef PointerUnion<InnerUnion1, InnerUnion2> ValTy;
+
+private:
+ ValTy Val;
+
+public:
+ PointerUnion4() {}
+
+ PointerUnion4(PT1 V) { Val = InnerUnion1(V); }
+ PointerUnion4(PT2 V) { Val = InnerUnion1(V); }
+ PointerUnion4(PT3 V) { Val = InnerUnion2(V); }
+ PointerUnion4(PT4 V) { Val = InnerUnion2(V); }
+
+ /// Test if the pointer held in the union is null, regardless of
+ /// which type it is.
+ bool isNull() const { return Val.isNull(); }
+ explicit operator bool() const { return !isNull(); }
+
+ /// Test if the Union currently holds the type matching T.
+ template <typename T> int is() const {
+ // 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>();
+ }
- /// PointerUnion4 - This is a pointer union of four pointer types. See
- /// documentation for PointerUnion for usage.
- template <typename PT1, typename PT2, typename PT3, typename PT4>
- class PointerUnion4 {
- public:
- typedef PointerUnion<PT1, PT2> InnerUnion1;
- typedef PointerUnion<PT3, PT4> InnerUnion2;
- typedef PointerUnion<InnerUnion1, InnerUnion2> ValTy;
- private:
- ValTy Val;
- public:
- PointerUnion4() {}
-
- PointerUnion4(PT1 V) {
- Val = InnerUnion1(V);
- }
- PointerUnion4(PT2 V) {
- Val = InnerUnion1(V);
- }
- PointerUnion4(PT3 V) {
- Val = InnerUnion2(V);
- }
- PointerUnion4(PT4 V) {
- Val = InnerUnion2(V);
- }
-
- /// isNull - Return true if the pointer held in the union is null,
- /// regardless of which type it is.
- bool isNull() const { return Val.isNull(); }
- explicit operator bool() const { return !isNull(); }
-
- /// is<T>() return true if the Union currently holds the type matching T.
- template<typename T>
- int is() const {
- // 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>();
- }
+ /// Returns the value of the specified pointer type.
+ ///
+ /// If the specified pointer type is incorrect, assert.
+ template <typename T> T get() const {
+ assert(is<T>() && "Invalid accessor called");
+ // 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>();
+ }
- /// get<T>() - Return the value of the specified pointer type. If the
- /// specified pointer type is incorrect, assert.
- template<typename T>
- T get() const {
- assert(is<T>() && "Invalid accessor called");
- // 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>();
- }
+ /// Returns the current pointer if it is of the specified pointer type,
+ /// otherwises returns null.
+ template <typename T> T dyn_cast() const {
+ if (is<T>())
+ return get<T>();
+ return T();
+ }
- /// dyn_cast<T>() - If the current value is of the specified pointer type,
- /// return it, otherwise return null.
- template<typename T>
- T dyn_cast() const {
- if (is<T>()) return get<T>();
- return T();
- }
+ /// Assignment from nullptr which just clears the union.
+ const PointerUnion4 &operator=(std::nullptr_t) {
+ Val = nullptr;
+ return *this;
+ }
- /// \brief Assignment from nullptr which just clears the union.
- const PointerUnion4 &operator=(std::nullptr_t) {
- Val = nullptr;
- return *this;
- }
+ /// Assignment operators - Allow assigning into this union from either
+ /// pointer type, setting the discriminator to remember what it came from.
+ const PointerUnion4 &operator=(const PT1 &RHS) {
+ Val = InnerUnion1(RHS);
+ return *this;
+ }
+ const PointerUnion4 &operator=(const PT2 &RHS) {
+ Val = InnerUnion1(RHS);
+ return *this;
+ }
+ const PointerUnion4 &operator=(const PT3 &RHS) {
+ Val = InnerUnion2(RHS);
+ return *this;
+ }
+ const PointerUnion4 &operator=(const PT4 &RHS) {
+ Val = InnerUnion2(RHS);
+ return *this;
+ }
- /// Assignment operators - Allow assigning into this union from either
- /// pointer type, setting the discriminator to remember what it came from.
- const PointerUnion4 &operator=(const PT1 &RHS) {
- Val = InnerUnion1(RHS);
- return *this;
- }
- const PointerUnion4 &operator=(const PT2 &RHS) {
- Val = InnerUnion1(RHS);
- return *this;
- }
- const PointerUnion4 &operator=(const PT3 &RHS) {
- Val = InnerUnion2(RHS);
- return *this;
- }
- const PointerUnion4 &operator=(const PT4 &RHS) {
- Val = InnerUnion2(RHS);
- return *this;
- }
+ void *getOpaqueValue() const { return Val.getOpaqueValue(); }
+ static inline PointerUnion4 getFromOpaqueValue(void *VP) {
+ PointerUnion4 V;
+ V.Val = ValTy::getFromOpaqueValue(VP);
+ return V;
+ }
+};
+
+// Teach SmallPtrSet that PointerUnion4 is "basically a pointer", that has
+// # low bits available = min(PT1bits,PT2bits,PT2bits)-2.
+template <typename PT1, typename PT2, typename PT3, typename PT4>
+class PointerLikeTypeTraits<PointerUnion4<PT1, PT2, PT3, PT4>> {
+public:
+ static inline void *
+ getAsVoidPointer(const PointerUnion4<PT1, PT2, PT3, PT4> &P) {
+ return P.getOpaqueValue();
+ }
+ static inline PointerUnion4<PT1, PT2, PT3, PT4> getFromVoidPointer(void *P) {
+ return PointerUnion4<PT1, PT2, PT3, PT4>::getFromOpaqueValue(P);
+ }
- void *getOpaqueValue() const { return Val.getOpaqueValue(); }
- static inline PointerUnion4 getFromOpaqueValue(void *VP) {
- PointerUnion4 V;
- V.Val = ValTy::getFromOpaqueValue(VP);
- return V;
- }
+ // The number of bits available are the min of the two pointer types.
+ enum {
+ NumLowBitsAvailable = PointerLikeTypeTraits<
+ typename PointerUnion4<PT1, PT2, PT3, PT4>::ValTy>::NumLowBitsAvailable
};
+};
- // Teach SmallPtrSet that PointerUnion4 is "basically a pointer", that has
- // # low bits available = min(PT1bits,PT2bits,PT2bits)-2.
- template<typename PT1, typename PT2, typename PT3, typename PT4>
- class PointerLikeTypeTraits<PointerUnion4<PT1, PT2, PT3, PT4> > {
- public:
- static inline void *
- getAsVoidPointer(const PointerUnion4<PT1, PT2, PT3, PT4> &P) {
- return P.getOpaqueValue();
- }
- static inline PointerUnion4<PT1, PT2, PT3, PT4>
- getFromVoidPointer(void *P) {
- return PointerUnion4<PT1, PT2, PT3, PT4>::getFromOpaqueValue(P);
- }
+// Teach DenseMap how to use PointerUnions as keys.
+template <typename T, typename U> struct DenseMapInfo<PointerUnion<T, U>> {
+ typedef PointerUnion<T, U> Pair;
+ typedef DenseMapInfo<T> FirstInfo;
+ typedef DenseMapInfo<U> SecondInfo;
- // The number of bits available are the min of the two pointer types.
- enum {
- NumLowBitsAvailable =
- PointerLikeTypeTraits<typename PointerUnion4<PT1, PT2, PT3, PT4>::ValTy>
- ::NumLowBitsAvailable
- };
- };
-
- // Teach DenseMap how to use PointerUnions as keys.
- template<typename T, typename U>
- struct DenseMapInfo<PointerUnion<T, U> > {
- typedef PointerUnion<T, U> Pair;
- typedef DenseMapInfo<T> FirstInfo;
- typedef DenseMapInfo<U> SecondInfo;
+ static inline Pair getEmptyKey() { return Pair(FirstInfo::getEmptyKey()); }
+ static inline Pair getTombstoneKey() {
+ return Pair(FirstInfo::getTombstoneKey());
+ }
+ static unsigned getHashValue(const Pair &PairVal) {
+ intptr_t key = (intptr_t)PairVal.getOpaqueValue();
+ return DenseMapInfo<intptr_t>::getHashValue(key);
+ }
+ static bool isEqual(const Pair &LHS, const Pair &RHS) {
+ return LHS.template is<T>() == RHS.template is<T>() &&
+ (LHS.template is<T>() ? FirstInfo::isEqual(LHS.template get<T>(),
+ RHS.template get<T>())
+ : SecondInfo::isEqual(LHS.template get<U>(),
+ RHS.template get<U>()));
+ }
+};
- static inline Pair getEmptyKey() {
- return Pair(FirstInfo::getEmptyKey());
- }
- static inline Pair getTombstoneKey() {
- return Pair(FirstInfo::getTombstoneKey());
- }
- static unsigned getHashValue(const Pair &PairVal) {
- intptr_t key = (intptr_t)PairVal.getOpaqueValue();
- return DenseMapInfo<intptr_t>::getHashValue(key);
- }
- static bool isEqual(const Pair &LHS, const Pair &RHS) {
- return LHS.template is<T>() == RHS.template is<T>() &&
- (LHS.template is<T>() ?
- FirstInfo::isEqual(LHS.template get<T>(),
- RHS.template get<T>()) :
- SecondInfo::isEqual(LHS.template get<U>(),
- RHS.template get<U>()));
- }
- };
}
#endif
projects / oota-llvm.git / commitdiff