#include "llvm/Support/DataTypes.h"
namespace llvm {
-
+
/// PointerLikeTypeTraits - This is a traits object that is used to handle
/// pointer types and things that are just wrappers for pointers as a uniform
/// entity.
template<typename T>
class PointerLikeTypeTraits<T*> {
public:
- static inline void *getAsVoidPointer(T* P) { return P; }
- static inline T *getFromVoidPointer(void *P) {
- return static_cast<T*>(P);
- }
-
- /// Note, we assume here that malloc returns objects at least 8-byte aligned.
+ static inline void *getAsVoidPointer(T *P) { return P; }
+ static inline T *getFromVoidPointer(void *P) { return static_cast<T *>(P); }
+
+ /// Note, we assume here that malloc returns objects at least 4-byte aligned.
/// However, this may be wrong, or pointers may be from something other than
/// malloc. In this case, you should specialize this template to reduce this.
///
/// All clients should use assertions to do a run-time check to ensure that
/// this is actually true.
- enum { NumLowBitsAvailable = 3 };
+ enum { NumLowBitsAvailable = 2 };
};
-
+
// Provide PointerLikeTypeTraits for const pointers.
template<typename T>
class PointerLikeTypeTraits<const T*> {
+ typedef PointerLikeTypeTraits<T*> NonConst;
+
public:
- static inline const void *getAsVoidPointer(const T* P) { return P; }
+ static inline const void *getAsVoidPointer(const T* P) {
+ return NonConst::getAsVoidPointer(const_cast<T*>(P));
+ }
static inline const T *getFromVoidPointer(const void *P) {
- return static_cast<const T*>(P);
+ return NonConst::getFromVoidPointer(const_cast<void*>(P));
}
- enum { NumLowBitsAvailable = 3 };
+ enum { NumLowBitsAvailable = NonConst::NumLowBitsAvailable };
};
-// Pointers to pointers are only 4-byte aligned on 32-bit systems.
-template<typename T>
-class PointerLikeTypeTraits<T**> {
-public:
- static inline void *getAsVoidPointer(T** P) { return P; }
- static inline T **getFromVoidPointer(void *P) {
- return static_cast<T**>(P);
- }
- enum { NumLowBitsAvailable = 2 };
-};
-
-
-
-
// Provide PointerLikeTypeTraits for uintptr_t.
template<>
class PointerLikeTypeTraits<uintptr_t> {
// No bits are available!
enum { NumLowBitsAvailable = 0 };
};
-
+
} // end namespace llvm
#endif