/// Note: If you add an element to this, you need to add an element to the
/// Type::getPrimitiveType function, or else things will break!
///
- enum PrimitiveID {
+ enum TypeID {
VoidTyID = 0 , BoolTyID, // 0, 1: Basics...
UByteTyID , SByteTyID, // 2, 3: 8 bit types...
UShortTyID , ShortTyID, // 4, 5: 16 bit types...
//PackedTyID , // SIMD 'packed' format... TODO
//...
- NumPrimitiveIDs, // Must remain as last defined ID
+ NumTypeIDs, // Must remain as last defined ID
FirstDerivedTyID = FunctionTyID,
};
private:
- PrimitiveID ID; // The current base type of this type...
- unsigned UID; // The unique ID number for this class
- bool Abstract; // True if type contains an OpaqueType
+ TypeID ID; // The current base type of this type...
+ 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(const std::string &Name, TypeID id);
virtual ~Type() {}
- /// setName - Associate the name with this type in the symbol table, but don't
- /// set the local name to be equal specified name.
- ///
- virtual void setName(const std::string &Name, SymbolTable *ST = 0);
/// Types can become nonabstract later, if they are refined.
///
///
bool isTypeAbstract();
+ unsigned getRefCount() const { return RefCount; }
+
/// ForwardType - This field is used to implement the union find scheme for
/// abstract types. When types are refined to other types, this field is set
/// to the more refined type. Only abstract types can be forwarded.
public:
virtual void print(std::ostream &O) const;
+ /// @brief Debugging support: print to stderr
+ virtual void dump() const;
+
+ /// setName - Associate the name with this type in the symbol table, but don't
+ /// set the local name to be equal specified name.
+ ///
+ virtual void setName(const std::string &Name, SymbolTable *ST = 0);
+
//===--------------------------------------------------------------------===//
// Property accessors for dealing with types... Some of these virtual methods
// are defined in private classes defined in Type.cpp for primitive types.
//
- /// getPrimitiveID - Return the base type of the type. This will return one
- /// of the PrimitiveID enum elements defined above.
+ /// getTypeID - Return the type id for the type. This will return one
+ /// of the TypeID enum elements defined above.
///
- inline PrimitiveID getPrimitiveID() const { return ID; }
+ inline TypeID getTypeID() const { return ID; }
/// getUniqueID - Returns the UID of the type. This can be thought of as a
/// small integer version of the pointer to the type class. Two types that
/// isSigned - Return whether an integral numeric type is signed. This is
/// true for SByteTy, ShortTy, IntTy, LongTy. Note that this is not true for
/// Float and Double.
- //
+ ///
virtual bool isSigned() const { return 0; }
/// isUnsigned - Return whether a numeric type is unsigned. This is not quite
///
unsigned getPrimitiveSize() const;
+ /// getUnsignedVersion - If this is an integer type, return the unsigned
+ /// variant of this type. For example int -> uint.
+ const Type *getUnsignedVersion() const;
+
+ /// getSignedVersion - If this is an integer type, return the signed variant
+ /// of this type. For example uint -> int.
+ const Type *getSignedVersion() const;
+
/// getForwaredType - Return the type that this type has been resolved to if
/// it has been resolved to anything. This is used to implement the
- /// union-find algorithm for type resolution.
+ /// union-find algorithm for type resolution, and shouldn't be used by general
+ /// purpose clients.
const Type *getForwardedType() const {
if (!ForwardType) return 0;
return getForwardedTypeInternal();
//
/// getPrimitiveType/getUniqueIDType - Return a type based on an identifier.
- static const Type *getPrimitiveType(PrimitiveID IDNumber);
+ static const Type *getPrimitiveType(TypeID IDNumber);
static const Type *getUniqueIDType(unsigned UID);
//===--------------------------------------------------------------------===//
}
#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...
};
template <> inline bool isa_impl<PointerType, Type>(const Type &Ty) {
- return Ty.getPrimitiveID() == Type::PointerTyID;
+ return Ty.getTypeID() == Type::PointerTyID;
}
} // End llvm namespace
projects / oota-llvm.git / blobdiff