// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
-
+//
+// This file contains the declaration of the Type class. For more "Type"
+// stuff, look in DerivedTypes.h.
+//
+//===----------------------------------------------------------------------===//
#ifndef LLVM_TYPE_H
#define LLVM_TYPE_H
-#include "llvm/AbstractTypeUser.h"
#include "llvm/Support/Casting.h"
-#include "llvm/System/DataTypes.h"
-#include "llvm/System/Atomic.h"
-#include "llvm/ADT/GraphTraits.h"
-#include <string>
-#include <vector>
namespace llvm {
-class DerivedType;
class PointerType;
class IntegerType;
-class TypeMapBase;
class raw_ostream;
class Module;
class LLVMContext;
+class LLVMContextImpl;
+template<class GraphType> struct GraphTraits;
-/// This file contains the declaration of the Type class. For more "Type" type
-/// stuff, look in DerivedTypes.h.
-///
/// The instances of the Type class are immutable: once they are created,
/// they are never changed. Also note that only one instance of a particular
/// type is ever created. Thus seeing if two types are equal is a matter of
/// doing a trivial pointer comparison. To enforce that no two equal instances
/// are created, Type instances can only be created via static factory methods
-/// in class Type and in derived classes.
-///
-/// Once allocated, Types are never free'd, unless they are an abstract type
-/// that is resolved to a more concrete type.
+/// in class Type and in derived classes. Once allocated, Types are never
+/// free'd.
///
-/// Types themself don't have a name, and can be named either by:
-/// - using SymbolTable instance, typically from some Module,
-/// - using convenience methods in the Module class (which uses module's
-/// SymbolTable too).
-///
-/// Opaque types are simple derived types with no state. There may be many
-/// different Opaque type objects floating around, but two are only considered
-/// identical if they are pointer equals of each other. This allows us to have
-/// two opaque types that end up resolving to different concrete types later.
-///
-/// Opaque types are also kinda weird and scary and different because they have
-/// to keep a list of uses of the type. When, through linking, parsing, or
-/// bitcode reading, they become resolved, they need to find and update all
-/// users of the unknown type, causing them to reference a new, more concrete
-/// type. Opaque types are deleted when their use list dwindles to zero users.
-///
-/// @brief Root of type hierarchy
-class Type : public AbstractTypeUser {
+class Type {
public:
- //===-------------------------------------------------------------------===//
+ //===--------------------------------------------------------------------===//
/// Definitions of all of the base types for the Type system. Based on this
- /// value, you can cast to a "DerivedType" subclass (see DerivedTypes.h)
+ /// value, you can cast to a class defined in DerivedTypes.h.
/// Note: If you add an element to this, you need to add an element to the
/// Type::getPrimitiveType function, or else things will break!
/// Also update LLVMTypeKind and LLVMGetTypeKind () in the C binding.
///
enum TypeID {
- // PrimitiveTypes .. make sure LastPrimitiveTyID stays up to date
+ // PrimitiveTypes - make sure LastPrimitiveTyID stays up to date.
VoidTyID = 0, ///< 0: type with no size
- FloatTyID, ///< 1: 32 bit floating point type
- DoubleTyID, ///< 2: 64 bit floating point type
- X86_FP80TyID, ///< 3: 80 bit floating point type (X87)
- FP128TyID, ///< 4: 128 bit floating point type (112-bit mantissa)
- PPC_FP128TyID, ///< 5: 128 bit floating point type (two 64-bits)
+ FloatTyID, ///< 1: 32-bit floating point type
+ DoubleTyID, ///< 2: 64-bit floating point type
+ X86_FP80TyID, ///< 3: 80-bit floating point type (X87)
+ FP128TyID, ///< 4: 128-bit floating point type (112-bit mantissa)
+ PPC_FP128TyID, ///< 5: 128-bit floating point type (two 64-bits, PowerPC)
LabelTyID, ///< 6: Labels
MetadataTyID, ///< 7: Metadata
-
- // Derived types... see DerivedTypes.h file...
- // Make sure FirstDerivedTyID stays up to date!!!
- IntegerTyID, ///< 8: Arbitrary bit width integers
- FunctionTyID, ///< 9: Functions
- StructTyID, ///< 10: Structures
- ArrayTyID, ///< 11: Arrays
- PointerTyID, ///< 12: Pointers
- OpaqueTyID, ///< 13: Opaque: type with unknown structure
+ X86_MMXTyID, ///< 8: MMX vectors (64 bits, X86 specific)
+
+ // Derived types... see DerivedTypes.h file.
+ // Make sure FirstDerivedTyID stays up to date!
+ IntegerTyID, ///< 9: Arbitrary bit width integers
+ FunctionTyID, ///< 10: Functions
+ StructTyID, ///< 11: Structures
+ ArrayTyID, ///< 12: Arrays
+ PointerTyID, ///< 13: Pointers
VectorTyID, ///< 14: SIMD 'packed' format, or other vector type
NumTypeIDs, // Must remain as last defined ID
- LastPrimitiveTyID = LabelTyID,
+ LastPrimitiveTyID = X86_MMXTyID,
FirstDerivedTyID = IntegerTyID
};
private:
- TypeID ID : 8; // The current base type of this type.
- bool Abstract : 1; // True if type contains an OpaqueType
- unsigned SubclassData : 23; //Space for subclasses to store data
-
- /// 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 sys::cas_flag RefCount;
-
/// Context - This refers to the LLVMContext in which this type was uniqued.
LLVMContext &Context;
- friend class LLVMContextImpl;
-
- const Type *getForwardedTypeInternal() const;
- // Some Type instances are allocated as arrays, some aren't. So we provide
- // this method to get the right kind of destruction for the type of Type.
- void destroy() const; // const is a lie, this does "delete this"!
+ TypeID ID : 8; // The current base type of this type.
+ unsigned SubclassData : 24; // Space for subclasses to store data
protected:
- explicit Type(LLVMContext &C, TypeID id) :
- ID(id), Abstract(false), SubclassData(0),
- RefCount(0), Context(C),
- ForwardType(0), NumContainedTys(0),
- ContainedTys(0) {}
- virtual ~Type() {
- assert(AbstractTypeUsers.empty() && "Abstract types remain");
- }
-
- /// Types can become nonabstract later, if they are refined.
- ///
- inline void setAbstract(bool Val) { Abstract = Val; }
-
- unsigned getRefCount() const { return RefCount; }
+ friend class LLVMContextImpl;
+ explicit Type(LLVMContext &C, TypeID tid)
+ : Context(C), ID(tid), SubclassData(0),
+ NumContainedTys(0), ContainedTys(0) {}
+ ~Type() {}
unsigned getSubclassData() const { return SubclassData; }
- void setSubclassData(unsigned val) { SubclassData = val; }
-
- /// 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.
- mutable const Type *ForwardType;
-
-
- /// 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.
- ///
- mutable std::vector<AbstractTypeUser *> AbstractTypeUsers;
+ void setSubclassData(unsigned val) {
+ SubclassData = val;
+ // Ensure we don't have any accidental truncation.
+ assert(SubclassData == val && "Subclass data too large for field");
+ }
- /// NumContainedTys - Keeps track of how many PATypeHandle instances there
- /// are at the end of this type instance for the list of contained types. It
- /// is the subclasses responsibility to set this up. Set to 0 if there are no
- /// contained types in this type.
+ /// NumContainedTys - Keeps track of how many Type*'s there are in the
+ /// ContainedTys list.
unsigned NumContainedTys;
- /// ContainedTys - A pointer to the array of Types (PATypeHandle) contained
- /// by this Type. For example, this includes the arguments of a function
- /// type, the elements of a structure, the pointee of a pointer, the element
- /// type of an array, etc. This pointer may be 0 for types that don't
- /// contain other types (Integer, Double, Float). In general, the subclass
- /// should arrange for space for the PATypeHandles to be included in the
- /// allocation of the type object and set this pointer to the address of the
- /// first element. This allows the Type class to manipulate the ContainedTys
- /// without understanding the subclass's placement for this array. keeping
- /// it here also allows the subtype_* members to be implemented MUCH more
- /// efficiently, and dynamically very few types do not contain any elements.
- PATypeHandle *ContainedTys;
+ /// ContainedTys - A pointer to the array of Types contained by this Type.
+ /// For example, this includes the arguments of a function type, the elements
+ /// of a structure, the pointee of a pointer, the element type of an array,
+ /// etc. This pointer may be 0 for types that don't contain other types
+ /// (Integer, Double, Float).
+ Type * const *ContainedTys;
public:
void print(raw_ostream &O) const;
-
- /// @brief Debugging support: print to stderr
void dump() const;
- /// @brief Debugging support: print to stderr (use type names from context
- /// module).
- void dump(const Module *Context) const;
-
- /// getContext - Fetch the LLVMContext in which this type was uniqued.
+ /// getContext - Return the LLVMContext in which this type was uniqued.
LLVMContext &getContext() const { return Context; }
//===--------------------------------------------------------------------===//
- // Property accessors for dealing with types... Some of these virtual methods
- // are defined in private classes defined in Type.cpp for primitive types.
+ // Accessors for working with types.
//
/// getTypeID - Return the type id for the type. This will return one
/// of the TypeID enum elements defined above.
///
- inline TypeID getTypeID() const { return ID; }
+ TypeID getTypeID() const { return ID; }
/// isVoidTy - Return true if this is 'void'.
bool isVoidTy() const { return ID == VoidTyID; }
/// isPPC_FP128Ty - Return true if this is powerpc long double.
bool isPPC_FP128Ty() const { return ID == PPC_FP128TyID; }
+ /// isFloatingPointTy - Return true if this is one of the five floating point
+ /// types
+ bool isFloatingPointTy() const {
+ return ID == FloatTyID || ID == DoubleTyID ||
+ ID == X86_FP80TyID || ID == FP128TyID || ID == PPC_FP128TyID;
+ }
+
+ /// isX86_MMXTy - Return true if this is X86 MMX.
+ bool isX86_MMXTy() const { return ID == X86_MMXTyID; }
+
+ /// isFPOrFPVectorTy - Return true if this is a FP type or a vector of FP.
+ ///
+ bool isFPOrFPVectorTy() const;
+
/// isLabelTy - Return true if this is 'label'.
bool isLabelTy() const { return ID == LabelTyID; }
/// isMetadataTy - Return true if this is 'metadata'.
bool isMetadataTy() const { return ID == MetadataTyID; }
- /// getDescription - Return the string representation of the type.
- std::string getDescription() const;
-
- /// isInteger - True if this is an instance of IntegerType.
+ /// isIntegerTy - True if this is an instance of IntegerType.
///
- bool isInteger() const { return ID == IntegerTyID; }
+ bool isIntegerTy() const { return ID == IntegerTyID; }
- /// isIntOrIntVector - Return true if this is an integer type or a vector of
+ /// isIntegerTy - Return true if this is an IntegerType of the given width.
+ bool isIntegerTy(unsigned Bitwidth) const;
+
+ /// isIntOrIntVectorTy - Return true if this is an integer type or a vector of
/// integer types.
///
- bool isIntOrIntVector() const;
+ bool isIntOrIntVectorTy() const;
- /// isFloatingPoint - Return true if this is one of the five floating point
- /// types
- bool isFloatingPoint() const { return ID == FloatTyID || ID == DoubleTyID ||
- ID == X86_FP80TyID || ID == FP128TyID || ID == PPC_FP128TyID; }
+ /// isFunctionTy - True if this is an instance of FunctionType.
+ ///
+ bool isFunctionTy() const { return ID == FunctionTyID; }
- /// isFPOrFPVector - Return true if this is a FP type or a vector of FP types.
+ /// isStructTy - True if this is an instance of StructType.
///
- bool isFPOrFPVector() const;
-
- /// isAbstract - True if the type is either an Opaque type, or is a derived
- /// type that includes an opaque type somewhere in it.
+ bool isStructTy() const { return ID == StructTyID; }
+
+ /// isArrayTy - True if this is an instance of ArrayType.
+ ///
+ bool isArrayTy() const { return ID == ArrayTyID; }
+
+ /// isPointerTy - True if this is an instance of PointerType.
+ ///
+ bool isPointerTy() const { return ID == PointerTyID; }
+
+ /// isVectorTy - True if this is an instance of VectorType.
///
- inline bool isAbstract() const { return Abstract; }
+ bool isVectorTy() const { return ID == VectorTyID; }
/// canLosslesslyBitCastTo - Return true if this type could be converted
/// with a lossless BitCast to type 'Ty'. For example, i8* to i32*. BitCasts
/// are valid for types of the same size only where no re-interpretation of
/// the bits is done.
/// @brief Determine if this type could be losslessly bitcast to Ty
- bool canLosslesslyBitCastTo(const Type *Ty) const;
+ bool canLosslesslyBitCastTo(Type *Ty) const;
+ /// isEmptyTy - Return true if this type is empty, that is, it has no
+ /// elements or all its elements are empty.
+ bool isEmptyTy() const;
/// Here are some useful little methods to query what type derived types are
/// Note that all other types can just compare to see if this == Type::xxxTy;
///
- inline bool isPrimitiveType() const { return ID <= LastPrimitiveTyID; }
- inline bool isDerivedType() const { return ID >= FirstDerivedTyID; }
+ bool isPrimitiveType() const { return ID <= LastPrimitiveTyID; }
+ bool isDerivedType() const { return ID >= FirstDerivedTyID; }
/// isFirstClassType - Return true if the type is "first class", meaning it
/// is a valid type for a Value.
///
- inline bool isFirstClassType() const {
- // There are more first-class kinds than non-first-class kinds, so a
- // negative test is simpler than a positive one.
- return ID != FunctionTyID && ID != VoidTyID && ID != OpaqueTyID;
+ bool isFirstClassType() const {
+ return ID != FunctionTyID && ID != VoidTyID;
}
/// isSingleValueType - Return true if the type is a valid type for a
- /// virtual register in codegen. This includes all first-class types
- /// except struct and array types.
+ /// register in codegen. This includes all first-class types except struct
+ /// and array types.
///
- inline bool isSingleValueType() const {
- return (ID != VoidTyID && ID <= LastPrimitiveTyID) ||
+ bool isSingleValueType() const {
+ return (ID != VoidTyID && isPrimitiveType()) ||
ID == IntegerTyID || ID == PointerTyID || ID == VectorTyID;
}
/// extractvalue instruction. This includes struct and array types, but
/// does not include vector types.
///
- inline bool isAggregateType() const {
+ bool isAggregateType() const {
return ID == StructTyID || ID == ArrayTyID;
}
///
bool isSized() const {
// If it's a primitive, it is always sized.
- if (ID == IntegerTyID || isFloatingPoint() || ID == PointerTyID)
+ if (ID == IntegerTyID || isFloatingPointTy() || ID == PointerTyID ||
+ ID == X86_MMXTyID)
return true;
// If it is not something that can have a size (e.g. a function or label),
// it doesn't have a size.
if (ID != StructTyID && ID != ArrayTyID && ID != VectorTyID)
return false;
- // If it is something that can have a size and it's concrete, it definitely
- // has a size, otherwise we have to try harder to decide.
- return !isAbstract() || isSizedDerivedType();
+ // Otherwise we have to try harder to decide.
+ return isSizedDerivedType();
}
/// getPrimitiveSizeInBits - Return the basic size of this type if it is a
/// getScalarSizeInBits - If this is a vector type, return the
/// getPrimitiveSizeInBits value for the element type. Otherwise return the
/// getPrimitiveSizeInBits value for this type.
- unsigned getScalarSizeInBits() const;
+ unsigned getScalarSizeInBits();
/// getFPMantissaWidth - Return the width of the mantissa of this type. This
/// is only valid on floating point types. If the FP type does not
/// have a stable mantissa (e.g. ppc long double), this method returns -1.
int getFPMantissaWidth() const;
- /// getForwardedType - 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, and shouldn't be used by general
- /// purpose clients.
- const Type *getForwardedType() const {
- if (!ForwardType) return 0;
- return getForwardedTypeInternal();
- }
-
- /// getVAArgsPromotedType - Return the type an argument of this type
- /// will be promoted to if passed through a variable argument
- /// function.
- const Type *getVAArgsPromotedType(LLVMContext &C) const;
-
/// getScalarType - If this is a vector type, return the element type,
- /// otherwise return this.
- const Type *getScalarType() const;
+ /// otherwise return 'this'.
+ Type *getScalarType();
+
+ /// getNumElements - If this is a vector type, return the number of elements,
+ /// otherwise return zero.
+ unsigned getNumElements();
//===--------------------------------------------------------------------===//
- // Type Iteration support
+ // Type Iteration support.
//
- typedef PATypeHandle *subtype_iterator;
+ typedef Type * const *subtype_iterator;
subtype_iterator subtype_begin() const { return ContainedTys; }
subtype_iterator subtype_end() const { return &ContainedTys[NumContainedTys];}
/// (defined a the end of the file). For derived types, this returns the
/// types 'contained' in the derived type.
///
- const Type *getContainedType(unsigned i) const {
+ Type *getContainedType(unsigned i) const {
assert(i < NumContainedTys && "Index out of range!");
- return ContainedTys[i].get();
+ return ContainedTys[i];
}
/// getNumContainedTypes - Return the number of types in the derived type.
//
/// getPrimitiveType - Return a type based on an identifier.
- static const Type *getPrimitiveType(LLVMContext &C, TypeID IDNumber);
+ static Type *getPrimitiveType(LLVMContext &C, TypeID IDNumber);
//===--------------------------------------------------------------------===//
- // These are the builtin types that are always available...
+ // These are the builtin types that are always available.
//
- static const Type *getVoidTy(LLVMContext &C);
- static const Type *getLabelTy(LLVMContext &C);
- static const Type *getFloatTy(LLVMContext &C);
- static const Type *getDoubleTy(LLVMContext &C);
- static const Type *getMetadataTy(LLVMContext &C);
- static const Type *getX86_FP80Ty(LLVMContext &C);
- static const Type *getFP128Ty(LLVMContext &C);
- static const Type *getPPC_FP128Ty(LLVMContext &C);
- static const IntegerType *getInt1Ty(LLVMContext &C);
- static const IntegerType *getInt8Ty(LLVMContext &C);
- static const IntegerType *getInt16Ty(LLVMContext &C);
- static const IntegerType *getInt32Ty(LLVMContext &C);
- static const IntegerType *getInt64Ty(LLVMContext &C);
+ static Type *getVoidTy(LLVMContext &C);
+ static Type *getLabelTy(LLVMContext &C);
+ static Type *getFloatTy(LLVMContext &C);
+ static Type *getDoubleTy(LLVMContext &C);
+ static Type *getMetadataTy(LLVMContext &C);
+ static Type *getX86_FP80Ty(LLVMContext &C);
+ static Type *getFP128Ty(LLVMContext &C);
+ static Type *getPPC_FP128Ty(LLVMContext &C);
+ static Type *getX86_MMXTy(LLVMContext &C);
+ static IntegerType *getIntNTy(LLVMContext &C, unsigned N);
+ static IntegerType *getInt1Ty(LLVMContext &C);
+ static IntegerType *getInt8Ty(LLVMContext &C);
+ static IntegerType *getInt16Ty(LLVMContext &C);
+ static IntegerType *getInt32Ty(LLVMContext &C);
+ static IntegerType *getInt64Ty(LLVMContext &C);
//===--------------------------------------------------------------------===//
// Convenience methods for getting pointer types with one of the above builtin
// types as pointee.
//
- static const PointerType *getFloatPtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getDoublePtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getX86_FP80PtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getFP128PtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getPPC_FP128PtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getInt1PtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getInt8PtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getInt16PtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getInt32PtrTy(LLVMContext &C, unsigned AS = 0);
- static const PointerType *getInt64PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getFloatPtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getDoublePtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getX86_FP80PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getFP128PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getPPC_FP128PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getX86_MMXPtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getIntNPtrTy(LLVMContext &C, unsigned N, unsigned AS = 0);
+ static PointerType *getInt1PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getInt8PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getInt16PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getInt32PtrTy(LLVMContext &C, unsigned AS = 0);
+ static PointerType *getInt64PtrTy(LLVMContext &C, unsigned AS = 0);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const Type *) { return true; }
- void addRef() const {
- assert(isAbstract() && "Cannot add a reference to a non-abstract type!");
- sys::AtomicIncrement(&RefCount);
- }
-
- void dropRef() const {
- assert(isAbstract() && "Cannot drop a reference 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.
- sys::cas_flag OldCount = sys::AtomicDecrement(&RefCount);
- if (OldCount == 0 && AbstractTypeUsers.empty())
- this->destroy();
- }
-
- /// addAbstractTypeUser - Notify an abstract type that there is a new user of
- /// it. This function is called primarily by the PATypeHandle class.
- ///
- void addAbstractTypeUser(AbstractTypeUser *U) const;
-
- /// removeAbstractTypeUser - Notify an abstract type that a user of the class
- /// no longer has a handle to the type. This function is called primarily by
- /// the PATypeHandle class. When there are no users of the abstract type, it
- /// is annihilated, because there is no way to get a reference to it ever
- /// again.
- ///
- void removeAbstractTypeUser(AbstractTypeUser *U) const;
-
/// getPointerTo - Return a pointer to the current type. This is equivalent
/// to PointerType::get(Foo, AddrSpace).
- const PointerType *getPointerTo(unsigned AddrSpace = 0) const;
+ PointerType *getPointerTo(unsigned AddrSpace = 0);
private:
/// isSizedDerivedType - Derived types like structures and arrays are sized
/// iff all of the members of the type are sized as well. Since asking for
/// their size is relatively uncommon, move this operation out of line.
bool isSizedDerivedType() const;
-
- virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
- virtual void typeBecameConcrete(const DerivedType *AbsTy);
-
-protected:
- // PromoteAbstractToConcrete - This is an internal method used to calculate
- // change "Abstract" from true to false when types are refined.
- void PromoteAbstractToConcrete();
- friend class TypeMapBase;
};
-//===----------------------------------------------------------------------===//
-// 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.
-//
-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);
-}
-
-// Define inline methods for PATypeHolder.
-
-/// 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 Type* PATypeHolder::get() const {
- const Type *NewTy = Ty->getForwardedType();
- if (!NewTy) return const_cast<Type*>(Ty);
- return *const_cast<PATypeHolder*>(this) = NewTy;
-}
-
-inline void PATypeHolder::addRef() {
- assert(Ty && "Type Holder has a null type!");
- if (Ty->isAbstract())
- Ty->addRef();
-}
-
-inline void PATypeHolder::dropRef() {
- if (Ty->isAbstract())
- Ty->dropRef();
+// Printing of types.
+static inline raw_ostream &operator<<(raw_ostream &OS, Type &T) {
+ T.print(OS);
+ return OS;
}
+// allow isa<PointerType>(x) to work without DerivedTypes.h included.
+template <> struct isa_impl<PointerType, Type> {
+ static inline bool doit(const Type &Ty) {
+ return Ty.getTypeID() == Type::PointerTyID;
+ }
+};
+
//===----------------------------------------------------------------------===//
// Provide specializations of GraphTraits to be able to treat a type as a
-// graph of sub types...
+// graph of sub types.
+
template <> struct GraphTraits<Type*> {
typedef Type NodeType;
typedef const Type NodeType;
typedef Type::subtype_iterator ChildIteratorType;
- static inline NodeType *getEntryNode(const Type *T) { return T; }
+ static inline NodeType *getEntryNode(NodeType *T) { return T; }
static inline ChildIteratorType child_begin(NodeType *N) {
return N->subtype_begin();
}
}
};
-template <> inline bool isa_impl<PointerType, Type>(const Type &Ty) {
- return Ty.getTypeID() == Type::PointerTyID;
-}
-
-raw_ostream &operator<<(raw_ostream &OS, const Type &T);
-
} // End llvm namespace
#endif
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