#ifndef LLVM_ADT_POINTERUNION_H
#define LLVM_ADT_POINTERUNION_H
+#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/ADT/PointerIntPair.h"
+#include "llvm/Support/Compiler.h"
namespace llvm {
- /// \brief Statically get an integer for a type. For:
- /// @code
- /// PointerUnionTypeNum<PT1, PT2>::template NumFor<T>::Result
- /// @endcode
- /// Result will be 0 if T is PT1, 1 if it is PT2, and -1 otherwise.
- template <typename PT1, typename PT2>
- struct PointerUnionTypeNum {
- private:
- struct IsNeither { char x; };
- struct IsPT1 { char x[2]; };
- struct IsPT2 { char x[3]; };
-
- static IsPT1 determine(PT1 *P);
- static IsPT2 determine(PT2 *P);
- static IsNeither determine(...);
-
- public:
- template <typename T>
- struct NumFor {
- static const int Result = (int)sizeof(determine((T*)0)) - 2;
- };
- };
-
template <typename T>
struct PointerUnionTypeSelectorReturn {
typedef T Return;
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
};
};
/// 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*>(); // runtime assertion failure (regardless of tag)
+ /// Z = P.get<double*>(); // compile time failure.
/// P = (float*)0;
/// Y = P.get<float*>(); // ok.
/// X = P.get<int*>(); // runtime assertion failure.
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.setPointer(
- const_cast<void *>(PointerLikeTypeTraits<PT1>::getAsVoidPointer(V)));
- Val.setInt(0);
+ PointerUnion(PT1 V) : Val(
+ const_cast<void *>(PointerLikeTypeTraits<PT1>::getAsVoidPointer(V))) {
}
- PointerUnion(PT2 V) {
- Val.setPointer(
- const_cast<void *>(PointerLikeTypeTraits<PT2>::getAsVoidPointer(V)));
- Val.setInt(1);
+ 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 { return Val.getPointer() == 0; }
- operator bool() const { return !isNull(); }
+ 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());
+ }
+ LLVM_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 {
- static const int TyNo =
- ::llvm::PointerUnionTypeNum<PT1, PT2>::template NumFor<T>::Result;
- char TYPE_IS_NOT_IN_UNION[TyNo*2+1]; // statically check the type.
- (void)TYPE_IS_NOT_IN_UNION;
+ 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();
+ }
+
+ /// \brief 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.setPointer(
+ Val.initWithPointer(
const_cast<void *>(PointerLikeTypeTraits<PT1>::getAsVoidPointer(RHS)));
- Val.setInt(0);
return *this;
}
const PointerUnion &operator=(const PT2 &RHS) {
- Val.setPointer(
- const_cast<void *>(PointerLikeTypeTraits<PT2>::getAsVoidPointer(RHS)));
- Val.setInt(1);
+ Val.setPointerAndInt(
+ const_cast<void *>(PointerLikeTypeTraits<PT2>::getAsVoidPointer(RHS)),
+ 1);
return *this;
}
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>
/// isNull - Return true if the pointer held in the union is null,
/// regardless of which type it is.
bool isNull() const { return Val.isNull(); }
- operator bool() const { return !isNull(); }
+ LLVM_EXPLICIT operator bool() const { return !isNull(); }
/// is<T>() return true if the Union currently holds the type matching T.
template<typename T>
::llvm::PointerUnionTypeSelector<PT1, T, IsInnerUnion,
::llvm::PointerUnionTypeSelector<PT2, T, IsInnerUnion, IsPT3 >
>::Return Ty;
- return Ty(Val).is<T>();
+ return Ty(Val).template is<T>();
}
/// get<T>() - Return the value of the specified pointer type. If the
::llvm::PointerUnionTypeSelector<PT1, T, IsInnerUnion,
::llvm::PointerUnionTypeSelector<PT2, T, IsInnerUnion, IsPT3 >
>::Return Ty;
- return Ty(Val).get<T>();
+ return Ty(Val).template get<T>();
}
/// dyn_cast<T>() - If the current value is of the specified pointer type,
if (is<T>()) return get<T>();
return T();
}
+
+ /// \brief Assignment from nullptr which just clears the union.
+ const PointerUnion3 &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.
/// isNull - Return true if the pointer held in the union is null,
/// regardless of which type it is.
bool isNull() const { return Val.isNull(); }
- operator bool() const { return !isNull(); }
+ LLVM_EXPLICIT operator bool() const { return !isNull(); }
/// is<T>() return true if the Union currently holds the type matching T.
template<typename T>
if (is<T>()) return get<T>();
return T();
}
+
+ /// \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.
::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>()));
+ }
+ };
}
#endif
projects / oota-llvm.git / blobdiff