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[oota-llvm.git] / include / llvm / Support / PointerLikeTypeTraits.h

diff --git a/include/llvm/Support/PointerLikeTypeTraits.h b/include/llvm/Support/PointerLikeTypeTraits.h
index 41b2302381f0f4bdd4b2759af479cc962fa634d9..6b8845836221148393f4144f04f5cb6d3235b22a 100644 (file)
--- a/include/llvm/Support/PointerLikeTypeTraits.h
+++ b/include/llvm/Support/PointerLikeTypeTraits.h
@@ -15,8 +15,10 @@
 #ifndef LLVM_SUPPORT_POINTERLIKETYPETRAITS_H
 #define LLVM_SUPPORT_POINTERLIKETYPETRAITS_H
 
+#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.
@@ -35,27 +37,45 @@ public:
   static inline T *getFromVoidPointer(void *P) {
     return static_cast<T*>(P);
   }
-  
-  /// Note, we assume here that malloc returns objects at least 8-byte aligned.
+
+  /// 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.
-  static inline unsigned getNumLowBitsAvailable() { return 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));
   }
-  static inline unsigned getNumLowBitsAvailable() { return 3; }
+  enum { NumLowBitsAvailable = NonConst::NumLowBitsAvailable };
 };
-  
+
+// Provide PointerLikeTypeTraits for uintptr_t.
+template<>
+class PointerLikeTypeTraits<uintptr_t> {
+public:
+  static inline void *getAsVoidPointer(uintptr_t P) {
+    return reinterpret_cast<void*>(P);
+  }
+  static inline uintptr_t getFromVoidPointer(void *P) {
+    return reinterpret_cast<uintptr_t>(P);
+  }
+  // No bits are available!
+  enum { NumLowBitsAvailable = 0 };
+};
+
 } // end namespace llvm
 
 #endif