Rearrange code to eliminate warnings

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11512 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/DerivedTypes.h

@@ -29,20 +29,13 @@ class StructValType;
 class PointerValType;
 
 class DerivedType : public Type, public AbstractTypeUser {
-  /// RefCount - This counts the number of PATypeHolders that are pointing to
-  /// this type.  When this number falls to zero, if the type is abstract and
-  /// has no AbstractTypeUsers, the type is deleted.
-  ///
-  mutable unsigned RefCount;
-  
   // AbstractTypeUsers - Implement a list of the users that need to be notified
   // if I am a type, and I get resolved into a more concrete type.
   //
-  ///// FIXME: kill mutable nonsense when Types are not const
   mutable std::vector<AbstractTypeUser *> AbstractTypeUsers;
 
 protected:
-  DerivedType(PrimitiveID id) : Type("", id), RefCount(0) {}
+  DerivedType(PrimitiveID id) : Type("", id) {}
   ~DerivedType() {
     assert(AbstractTypeUsers.empty());
   }
@@ -59,6 +52,12 @@ protected:
   ///
   void dropAllTypeUses();
 
+  void RefCountIsZero() const {
+    if (AbstractTypeUsers.empty())
+      delete this;
+  }
+
+  
 public:
 
   //===--------------------------------------------------------------------===//
@@ -89,22 +88,6 @@ public:
   ///
   void refineAbstractTypeTo(const Type *NewType);
 
-  void addRef() const {
-    assert(isAbstract() && "Cannot add a reference to a non-abstract type!");
-    ++RefCount;
-  }
-
-  void dropRef() const {
-    assert(isAbstract() && "Cannot drop a refernce to a non-abstract type!");
-    assert(RefCount && "No objects are currently referencing this object!");
-
-    // If this is the last PATypeHolder using this object, and there are no
-    // PATypeHandles using it, the type is dead, delete it now.
-    if (--RefCount == 0 && AbstractTypeUsers.empty())
-      delete this;
-  }
-
-
   void dump() const { Value::dump(); }
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
@@ -406,51 +389,6 @@ public:
   }
 };
 
-
-// Define some inline methods for the AbstractTypeUser.h:PATypeHandle class.
-// These are defined here because they MUST be inlined, yet are dependent on 
-// the definition of the Type class.  Of course Type derives from Value, which
-// contains an AbstractTypeUser instance, so there is no good way to factor out
-// the code.  Hence this bit of uglyness.
-//
-inline void PATypeHandle::addUser() {
-  assert(Ty && "Type Handle has a null type!");
-  if (Ty->isAbstract())
-    cast<DerivedType>(Ty)->addAbstractTypeUser(User);
-}
-inline void PATypeHandle::removeUser() {
-  if (Ty->isAbstract())
-    cast<DerivedType>(Ty)->removeAbstractTypeUser(User);
-}
-
-inline void PATypeHandle::removeUserFromConcrete() {
-  if (!Ty->isAbstract())
-    cast<DerivedType>(Ty)->removeAbstractTypeUser(User);
-}
-
-// Define inline methods for PATypeHolder...
-
-inline void PATypeHolder::addRef() {
-  if (Ty->isAbstract())
-    cast<DerivedType>(Ty)->addRef();
-}
-
-inline void PATypeHolder::dropRef() {
-  if (Ty->isAbstract())
-    cast<DerivedType>(Ty)->dropRef();
-}
-
-/// get - This implements the forwarding part of the union-find algorithm for
-/// abstract types.  Before every access to the Type*, we check to see if the
-/// type we are pointing to is forwarding to a new type.  If so, we drop our
-/// reference to the type.
-///
-inline const Type* PATypeHolder::get() const {
-  const Type *NewTy = Ty->getForwardedType();
-  if (!NewTy) return Ty;
-  return *const_cast<PATypeHolder*>(this) = NewTy;
-}
-
 } // End llvm namespace
 
 #endif

include/llvm/Type.h

@@ -83,10 +83,17 @@ private:
   unsigned    UID;       // The unique ID number for this class
   bool        Abstract;  // True if type contains an OpaqueType
 
+  /// RefCount - This counts the number of PATypeHolders that are pointing to
+  /// this type.  When this number falls to zero, if the type is abstract and
+  /// has no AbstractTypeUsers, the type is deleted.  This is only sensical for
+  /// derived types.
+  ///
+  mutable unsigned RefCount;
+
   const Type *getForwardedTypeInternal() const;
 protected:
   /// ctor is protected, so only subclasses can create Type objects...
-  Type(const std::string &Name, PrimitiveID id);
+  Type(PrimitiveID id);
   virtual ~Type() {}
 
   /// setName - Associate the name with this type in the symbol table, but don't
@@ -259,8 +266,89 @@ public:
   }
 
 #include "llvm/Type.def"
+
+  // Virtual methods used by callbacks below.  These should only be implemented
+  // in the DerivedType class.
+  virtual void addAbstractTypeUser(AbstractTypeUser *U) const {
+    abort(); // Only on derived types!
+  }
+  virtual void removeAbstractTypeUser(AbstractTypeUser *U) const {
+    abort(); // Only on derived types!
+  }
+
+  void addRef() const {
+    assert(isAbstract() && "Cannot add a reference to a non-abstract type!");
+    ++RefCount;
+  }
+  
+  void dropRef() const {
+    assert(isAbstract() && "Cannot drop a refernce to a non-abstract type!");
+    assert(RefCount && "No objects are currently referencing this object!");
+
+    // If this is the last PATypeHolder using this object, and there are no
+    // PATypeHandles using it, the type is dead, delete it now.
+    if (--RefCount == 0)
+      RefCountIsZero();
+  }
+private:
+  virtual void RefCountIsZero() const {
+    abort(); // only on derived types!
+  }
+
 };
 
+//===----------------------------------------------------------------------===//
+// Define some inline methods for the AbstractTypeUser.h:PATypeHandle class.
+// These are defined here because they MUST be inlined, yet are dependent on 
+// the definition of the Type class.  Of course Type derives from Value, which
+// contains an AbstractTypeUser instance, so there is no good way to factor out
+// the code.  Hence this bit of uglyness.
+//
+// In the long term, Type should not derive from Value, allowing
+// AbstractTypeUser.h to #include Type.h, allowing us to eliminate this
+// nastyness entirely.
+//
+inline void PATypeHandle::addUser() {
+  assert(Ty && "Type Handle has a null type!");
+  if (Ty->isAbstract())
+    Ty->addAbstractTypeUser(User);
+}
+inline void PATypeHandle::removeUser() {
+  if (Ty->isAbstract())
+    Ty->removeAbstractTypeUser(User);
+}
+
+inline void PATypeHandle::removeUserFromConcrete() {
+  if (!Ty->isAbstract())
+    Ty->removeAbstractTypeUser(User);
+}
+
+// Define inline methods for PATypeHolder...
+
+inline void PATypeHolder::addRef() {
+  if (Ty->isAbstract())
+    Ty->addRef();
+}
+
+inline void PATypeHolder::dropRef() {
+  if (Ty->isAbstract())
+    Ty->dropRef();
+}
+
+/// get - This implements the forwarding part of the union-find algorithm for
+/// abstract types.  Before every access to the Type*, we check to see if the
+/// type we are pointing to is forwarding to a new type.  If so, we drop our
+/// reference to the type.
+///
+inline const Type* PATypeHolder::get() const {
+  const Type *NewTy = Ty->getForwardedType();
+  if (!NewTy) return Ty;
+  return *const_cast<PATypeHolder*>(this) = NewTy;
+}
+
+
+
+//===----------------------------------------------------------------------===//
 // Provide specializations of GraphTraits to be able to treat a type as a 
 // graph of sub types...