#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 {
- /// 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
};
};
-
+
/// 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
/// 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.
template <typename PT1, typename PT2>
class PointerUnion {
public:
- typedef PointerIntPair<void*, 1, bool,
+ 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.setPointer(
- const_cast<void *>(PointerLikeTypeTraits<PT1>::getAsVoidPointer(V)));
- Val.setInt(0);
- }
- PointerUnion(PT2 V) {
- Val.setPointer(
- const_cast<void *>(PointerLikeTypeTraits<PT2>::getAsVoidPointer(V)));
- Val.setInt(1);
- }
-
+
+ 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 { 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());
+ }
+ 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 {
- 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;
}
-
+
/// get<T>() - Return the value of the specified pointer type. If the
/// specified pointer type is incorrect, assert.
template<typename T>
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>
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();
+ }
+
+ /// \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();
+ }
+
+ /// \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;
}
-
+
void *getOpaqueValue() const { return Val.getOpaqueValue(); }
- static PointerUnion getFromOpaqueValue(void *VP) {
+ 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();
+ }
+
+ 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>
getFromVoidPointer(void *P) {
return PointerUnion<PT1, PT2>::getFromOpaqueValue(P);
}
-
+
// The number of bits available are the min of the two pointer types.
enum {
- NumLowBitsAvailable =
+ 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>
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() {}
-
+
PointerUnion3(PT1 V) {
Val = InnerUnion(V);
}
PointerUnion3(PT3 V) {
Val = 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(); }
- operator bool() const { return !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 {
- // 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
/// specified pointer type is incorrect, assert.
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,
/// return it, otherwise return null.
template<typename T>
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.
const PointerUnion3 &operator=(const PT1 &RHS) {
Val = RHS;
return *this;
}
-
+
void *getOpaqueValue() const { return Val.getOpaqueValue(); }
- static PointerUnion3 getFromOpaqueValue(void *VP) {
+ 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>
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 =
+ NumLowBitsAvailable =
PointerLikeTypeTraits<typename PointerUnion3<PT1, PT2, PT3>::ValTy>
::NumLowBitsAvailable
};
ValTy Val;
public:
PointerUnion4() {}
-
+
PointerUnion4(PT1 V) {
Val = InnerUnion1(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(); }
- operator bool() const { return !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 {
- // 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
/// specified pointer type is incorrect, assert.
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,
/// return it, otherwise return null.
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.
const PointerUnion4 &operator=(const PT1 &RHS) {
Val = InnerUnion2(RHS);
return *this;
}
-
+
void *getOpaqueValue() const { return Val.getOpaqueValue(); }
- static PointerUnion4 getFromOpaqueValue(void *VP) {
+ 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>
getFromVoidPointer(void *P) {
return PointerUnion4<PT1, PT2, PT3, PT4>::getFromOpaqueValue(P);
}
-
+
// The number of bits available are the min of the two pointer types.
enum {
- NumLowBitsAvailable =
+ 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>()));
+ }
+ };
+} // namespace llvm
#endif
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