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add a PointerUnion3 class and generalize PointerUnion to work with

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anything pointer-like, which may or may not actually be a pointer.

llvm-svn: 68056
This commit is contained in:
Chris Lattner 2009-03-30 20:29:27 +00:00
parent 2d00a451cb
commit a172ae1d4f
1 changed files with 120 additions and 15 deletions
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133
include/llvm/ADT/PointerUnion.h
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@ -22,12 +22,11 @@ namespace llvm {
/// getPointerUnionTypeNum - If the argument has type PT1* or PT2* return
/// false or true respectively.
template <typename PT1, typename PT2>
static inline bool getPointerUnionTypeNum(PT1 *P) { return false; }
static inline int getPointerUnionTypeNum(PT1 *P) { return 0; }
template <typename PT1, typename PT2>
static inline bool getPointerUnionTypeNum(PT2 *P) { return true; }
// Enable, if we could use static_assert.
//template <typename PT1, typename PT2>
//static inline bool getPointerUnionTypeNum(...) { abort() }
static inline int getPointerUnionTypeNum(PT2 *P) { return 1; }
template <typename PT1, typename PT2>
static inline int getPointerUnionTypeNum(...) { return -1; }
/// Provide PointerLikeTypeTraits for void* that is used by PointerUnion
@ -70,22 +69,25 @@ namespace llvm {
PointerUnion() {}
PointerUnion(PT1 V) {
Val.setPointer(V);
Val.setPointer(PointerLikeTypeTraits<PT1>::getAsVoidPointer(V));
Val.setInt(0);
}
PointerUnion(PT2 V) {
Val.setPointer(V);
Val.setPointer(PointerLikeTypeTraits<PT2>::getAsVoidPointer(V));
Val.setInt(1);
}
/// isNull - Return true if the pointer help in the union is null,
/// regardless of which type it is.
bool isNull() const { return Val.getPointer() == 0; }
operator bool() const { return !isNull(); }
/// is<T>() return true if the Union currently holds the type matching T.
template<typename T>
int is() const {
return Val.getInt() == ::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0);
int TyNo = ::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0);
assert(TyNo != -1 && "Type query could never succeed on PointerUnion!");
return Val.getInt() == TyNo;
}
/// get<T>() - Return the value of the specified pointer type. If the
@ -93,26 +95,26 @@ namespace llvm {
template<typename T>
T get() const {
assert(is<T>() && "Invalid accessor called");
return static_cast<T>(Val.getPointer());
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 static_cast<T>(Val.getPointer());
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 PointerUnion &operator=(const PT1 &RHS) {
Val.setPointer(RHS);
Val.setPointer(PointerLikeTypeTraits<PT1>::getAsVoidPointer(RHS));
Val.setInt(0);
return *this;
}
const PointerUnion &operator=(const PT2 &RHS) {
Val.setPointer(RHS);
Val.setPointer(PointerLikeTypeTraits<PT2>::getAsVoidPointer(RHS));
Val.setInt(1);
return *this;
}
@ -125,7 +127,7 @@ namespace llvm {
}
};
// Teach SmallPtrSet that PointerIntPair is "basically a pointer", that has
// 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> > {
@ -142,7 +144,110 @@ namespace llvm {
// The number of bits available are the min of the two pointer types.
enum {
NumLowBitsAvailable =
PointerUnion<PT1,PT2>::ValTy::NumLowBitsAvailable
PointerLikeTypeTraits<typename PointerUnion<PT1,PT2>::ValTy>
::NumLowBitsAvailable
};
};
/// 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;
public:
PointerUnion3() {}
PointerUnion3(PT1 V) {
Val = InnerUnion(V);
}
PointerUnion3(PT2 V) {
Val = InnerUnion(V);
}
PointerUnion3(PT3 V) {
Val = V;
}
/// isNull - Return true if the pointer help in the union is null,
/// regardless of which type it is.
bool isNull() const { return Val.isNull(); }
operator bool() const { return !isNull(); }
/// 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.get<InnerUnion>().is<T>();
// Must be PT3 or statically invalid.
assert(Val.is<T>());
return true;
}
/// 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 (Val.is<T>())
return Val.get<T>();
return Val.get<InnerUnion>().get<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 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;
}
void *getOpaqueValue() const { return Val.getOpaqueValue(); }
static 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
};
};
}