Removed ReadVal from SerializeTrait<T>, and also removed it from

Deserializer.

There were issues with Visual C++ barfing when instantiating
SerializeTrait<T> when "T" was an abstract class AND
SerializeTrait<T>::ReadVal was *never* called:

template <typename T>
struct SerializeTrait {
 <SNIP>
  static inline T ReadVal(Deserializer& D) { T::ReadVal(D); }
 <SNIP>
};

Visual C++ would complain about "T" being an abstract class, even
though ReadVal was never instantiated (although one of the other
member functions were).

Removing this from the trait is not a big deal.  It was used hardly
ever, and users who want "read-by-value" deserialization can simply
call the appropriate methods directly instead of relying on
trait-based-dispatch.  The trait dispatch for
serialization/deserialization is simply sugar in many cases (like this
one).

llvm-svn: 43624

include/llvm/Bitcode/Deserialize.h

@@ -103,11 +103,6 @@ public:
     SerializeTrait<T>::Read(*this,X);
     return X;
   }
-  
-  template <typename T>
-  inline T ReadVal() {
-    return SerializeTrait<T>::ReadVal(*this);
-  }
 
   template <typename T>
   inline T* Materialize() {

include/llvm/Bitcode/Serialization.h

@@ -37,15 +37,13 @@ template <typename T>
 struct SerializeTrait {
   static inline void Emit(Serializer& S, const T& X) { X.Emit(S); }
   static inline void Read(Deserializer& D, T& X) { X.Read(D); }
-  static inline T ReadVal(Deserializer& D) { T::ReadVal(D); }
   static inline T* Materialize(Deserializer& D) { return T::Materialize(D); }
 };
 
 #define SERIALIZE_INT_TRAIT(TYPE)\
 template <> struct SerializeTrait<TYPE> {\
   static void Emit(Serializer& S, TYPE X);\
-  static void Read(Deserializer& S, TYPE& X);\
-  static TYPE ReadVal(Deserializer& S); };
+  static void Read(Deserializer& S, TYPE& X); };
 
 SERIALIZE_INT_TRAIT(bool)
 SERIALIZE_INT_TRAIT(unsigned char)

lib/Bitcode/Reader/Deserialize.cpp

@@ -166,9 +166,7 @@ void Deserializer::BPEntry::SetPtr(BPNode*& FreeList, void* P) {
 
 #define INT_READ(TYPE)\
 void SerializeTrait<TYPE>::Read(Deserializer& D, TYPE& X) {\
-  X = (TYPE) D.ReadInt(); }\
-TYPE SerializeTrait<TYPE>::ReadVal(Deserializer& D) {\
-  return (TYPE) D.ReadInt(); }
+  X = (TYPE) D.ReadInt(); }
 
 INT_READ(bool)
 INT_READ(unsigned char)