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Do a compiler check that we use one of the types from PointerUnion[N], instead of a runtime check.
llvm-svn: 127145
This commit is contained in:
Argyrios Kyrtzidis
parent
6587cb0973
commit
9cd53db2f9
@ -19,15 +19,55 @@
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namespace llvm {
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/// getPointerUnionTypeNum - If the argument has type PT1* or PT2* return
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/// false or true respectively.
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/// \brief Statically get an integer for a type. For:
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/// @code
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/// PointerUnionTypeNum<PT1, PT2>::template NumFor<T>::Result
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/// @endcode
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/// Result will be 0 if T is PT1, 1 if it is PT2, and -1 otherwise.
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template <typename PT1, typename PT2>
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static inline int getPointerUnionTypeNum(PT1 *P) { return 0; }
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template <typename PT1, typename PT2>
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static inline int getPointerUnionTypeNum(PT2 *P) { return 1; }
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template <typename PT1, typename PT2>
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static inline int getPointerUnionTypeNum(...) { return -1; }
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struct PointerUnionTypeNum {
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private:
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struct IsNeither { char x; };
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struct IsPT1 { char x[2]; };
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struct IsPT2 { char x[3]; };
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static IsPT1 determine(PT1 *P);
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static IsPT2 determine(PT2 *P);
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static IsNeither determine(...);
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public:
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template <typename T>
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struct NumFor {
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static const int Result = (int)sizeof(determine((T*)0)) - 2;
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};
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};
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template <typename T>
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struct PointerUnionTypeSelectorReturn {
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typedef T Return;
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};
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/// \brief Get a type based on whether two types are the same or not. For:
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/// @code
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/// typedef typename PointerUnionTypeSelector<T1, T2, EQ, NE>::Return Ret;
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/// @endcode
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/// Ret will be EQ type if T1 is same as T2 or NE type otherwise.
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template <typename T1, typename T2, typename RET_EQ, typename RET_NE>
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struct PointerUnionTypeSelector {
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typedef typename PointerUnionTypeSelectorReturn<RET_NE>::Return Return;
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};
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template <typename T, typename RET_EQ, typename RET_NE>
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struct PointerUnionTypeSelector<T, T, RET_EQ, RET_NE> {
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typedef typename PointerUnionTypeSelectorReturn<RET_EQ>::Return Return;
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};
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template <typename T1, typename T2, typename RET_EQ, typename RET_NE>
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struct PointerUnionTypeSelectorReturn<
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PointerUnionTypeSelector<T1, T2, RET_EQ, RET_NE> > {
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typedef typename PointerUnionTypeSelector<T1, T2, RET_EQ, RET_NE>::Return
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Return;
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};
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/// Provide PointerLikeTypeTraits for void* that is used by PointerUnion
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/// for the two template arguments.
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@ -87,8 +127,10 @@ namespace llvm {
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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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int TyNo = ::llvm::getPointerUnionTypeNum<PT1, PT2>((T*)0);
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assert(TyNo != -1 && "Type query could never succeed on PointerUnion!");
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static const int TyNo =
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::llvm::PointerUnionTypeNum<PT1, PT2>::template NumFor<T>::Result;
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char TYPE_IS_NOT_IN_UNION[TyNo*2+1]; // statically check the type.
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(void)TYPE_IS_NOT_IN_UNION;
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return static_cast<int>(Val.getInt()) == TyNo;
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}
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@ -175,6 +217,34 @@ namespace llvm {
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typedef PointerUnion<InnerUnion, PT3> ValTy;
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private:
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ValTy Val;
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struct IsInnerUnion {
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ValTy Val;
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IsInnerUnion(ValTy val) : Val(val) { }
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template<typename T>
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int is() const {
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return Val.template is<InnerUnion>() &&
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Val.template get<InnerUnion>().template is<T>();
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}
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template<typename T>
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T get() const {
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return Val.template get<InnerUnion>().template get<T>();
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}
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};
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struct IsPT3 {
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ValTy Val;
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IsPT3(ValTy val) : Val(val) { }
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template<typename T>
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int is() const {
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return Val.template is<T>();
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}
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template<typename T>
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T get() const {
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return Val.template get<T>();
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}
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};
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public:
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PointerUnion3() {}
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@ -196,11 +266,12 @@ namespace llvm {
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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.template is<InnerUnion>() &&
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Val.template get<InnerUnion>().template is<T>();
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return Val.template is<T>();
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// If T is PT1/PT2 choose IsInnerUnion otherwise choose IsPT3.
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typedef typename
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::llvm::PointerUnionTypeSelector<PT1, T, IsInnerUnion,
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::llvm::PointerUnionTypeSelector<PT2, T, IsInnerUnion, IsPT3 >
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>::Return Ty;
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return Ty(Val).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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@ -208,11 +279,12 @@ namespace llvm {
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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.template get<InnerUnion>().template get<T>();
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return Val.template get<T>();
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// If T is PT1/PT2 choose IsInnerUnion otherwise choose IsPT3.
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typedef typename
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::llvm::PointerUnionTypeSelector<PT1, T, IsInnerUnion,
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::llvm::PointerUnionTypeSelector<PT2, T, IsInnerUnion, IsPT3 >
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>::Return Ty;
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return Ty(Val).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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@ -302,12 +374,13 @@ namespace llvm {
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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.template is<InnerUnion1>() &&
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Val.template get<InnerUnion1>().template is<T>();
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return Val.template is<InnerUnion2>() &&
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Val.template get<InnerUnion2>().template is<T>();
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// If T is PT1/PT2 choose InnerUnion1 otherwise choose InnerUnion2.
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typedef typename
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::llvm::PointerUnionTypeSelector<PT1, T, InnerUnion1,
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::llvm::PointerUnionTypeSelector<PT2, T, InnerUnion1, InnerUnion2 >
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>::Return Ty;
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return Val.template is<Ty>() &&
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Val.template get<Ty>().template 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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@ -315,11 +388,12 @@ namespace llvm {
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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.template get<InnerUnion1>().template get<T>();
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return Val.template get<InnerUnion2>().template get<T>();
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// If T is PT1/PT2 choose InnerUnion1 otherwise choose InnerUnion2.
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typedef typename
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::llvm::PointerUnionTypeSelector<PT1, T, InnerUnion1,
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::llvm::PointerUnionTypeSelector<PT2, T, InnerUnion1, InnerUnion2 >
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>::Return Ty;
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return Val.template get<Ty>().template 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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