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Implement PointerUnion4.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77487 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -254,6 +254,115 @@ namespace llvm {
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::NumLowBitsAvailable
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};
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};
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/// PointerUnion4 - This is a pointer union of four pointer types. See
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/// documentation for PointerUnion for usage.
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template <typename PT1, typename PT2, typename PT3, typename PT4>
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class PointerUnion4 {
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public:
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typedef PointerUnion<PT1, PT2> InnerUnion1;
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typedef PointerUnion<PT3, PT4> InnerUnion2;
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typedef PointerUnion<InnerUnion1, InnerUnion2> ValTy;
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private:
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ValTy Val;
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public:
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PointerUnion4() {}
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PointerUnion4(PT1 V) {
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Val = InnerUnion1(V);
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}
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PointerUnion4(PT2 V) {
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Val = InnerUnion1(V);
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}
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PointerUnion4(PT3 V) {
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Val = InnerUnion2(V);
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}
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PointerUnion4(PT4 V) {
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Val = InnerUnion2(V);
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}
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/// isNull - Return true if the pointer help in the union is null,
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/// regardless of which type it is.
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bool isNull() const { return Val.isNull(); }
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operator bool() const { return !isNull(); }
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/// is<T>() return true if the Union currently holds the type matching T.
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template<typename T>
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int is() const {
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// Is it PT1/PT2?
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if (::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0) != -1)
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return Val.is<InnerUnion1>() && Val.get<InnerUnion1>().is<T>();
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return Val.is<InnerUnion2>() && Val.get<InnerUnion2>().is<T>();
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}
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/// get<T>() - Return the value of the specified pointer type. If the
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/// specified pointer type is incorrect, assert.
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template<typename T>
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T get() const {
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assert(is<T>() && "Invalid accessor called");
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// Is it PT1/PT2?
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if (::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0) != -1)
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return Val.get<InnerUnion1>().get<T>();
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return Val.get<InnerUnion2>().get<T>();
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}
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/// dyn_cast<T>() - If the current value is of the specified pointer type,
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/// return it, otherwise return null.
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template<typename T>
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T dyn_cast() const {
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if (is<T>()) return get<T>();
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return T();
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}
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/// Assignment operators - Allow assigning into this union from either
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/// pointer type, setting the discriminator to remember what it came from.
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const PointerUnion4 &operator=(const PT1 &RHS) {
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Val = InnerUnion1(RHS);
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return *this;
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}
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const PointerUnion4 &operator=(const PT2 &RHS) {
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Val = InnerUnion1(RHS);
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return *this;
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}
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const PointerUnion4 &operator=(const PT3 &RHS) {
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Val = InnerUnion2(RHS);
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return *this;
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}
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const PointerUnion4 &operator=(const PT4 &RHS) {
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Val = InnerUnion2(RHS);
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return *this;
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}
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void *getOpaqueValue() const { return Val.getOpaqueValue(); }
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static PointerUnion4 getFromOpaqueValue(void *VP) {
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PointerUnion4 V;
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V.Val = ValTy::getFromOpaqueValue(VP);
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return V;
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}
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};
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// Teach SmallPtrSet that PointerUnion4 is "basically a pointer", that has
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// # low bits available = min(PT1bits,PT2bits,PT2bits)-2.
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template<typename PT1, typename PT2, typename PT3, typename PT4>
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class PointerLikeTypeTraits<PointerUnion4<PT1, PT2, PT3, PT4> > {
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public:
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static inline void *
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getAsVoidPointer(const PointerUnion4<PT1, PT2, PT3, PT4> &P) {
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return P.getOpaqueValue();
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}
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static inline PointerUnion4<PT1, PT2, PT3, PT4>
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getFromVoidPointer(void *P) {
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return PointerUnion4<PT1, PT2, PT3, PT4>::getFromOpaqueValue(P);
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}
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// The number of bits available are the min of the two pointer types.
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enum {
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NumLowBitsAvailable =
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PointerLikeTypeTraits<typename PointerUnion4<PT1, PT2, PT3, PT4>::ValTy>
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::NumLowBitsAvailable
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};
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};
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}
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#endif
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