1 //===-- llvm/DerivedTypes.h - Classes for handling data types ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declarations of classes that represent "derived
11 // types". These are things like "arrays of x" or "structure of x, y, z" or
12 // "method returning x taking (y,z) as parameters", etc...
14 // The implementations of these classes live in the Type.cpp file.
16 //===----------------------------------------------------------------------===//
18 #ifndef LLVM_DERIVED_TYPES_H
19 #define LLVM_DERIVED_TYPES_H
21 #include "llvm/Type.h"
22 #include "llvm/ADT/APInt.h"
27 template<class ValType, class TypeClass> class TypeMap;
28 class FunctionValType;
35 class DerivedType : public Type {
39 DerivedType(TypeID id) : Type(id) {}
41 /// notifyUsesThatTypeBecameConcrete - Notify AbstractTypeUsers of this type
42 /// that the current type has transitioned from being abstract to being
45 void notifyUsesThatTypeBecameConcrete();
47 /// dropAllTypeUses - When this (abstract) type is resolved to be equal to
48 /// another (more concrete) type, we must eliminate all references to other
49 /// types, to avoid some circular reference problems.
51 void dropAllTypeUses();
55 //===--------------------------------------------------------------------===//
56 // Abstract Type handling methods - These types have special lifetimes, which
57 // are managed by (add|remove)AbstractTypeUser. See comments in
58 // AbstractTypeUser.h for more information.
60 /// refineAbstractTypeTo - This function is used to when it is discovered that
61 /// the 'this' abstract type is actually equivalent to the NewType specified.
62 /// This causes all users of 'this' to switch to reference the more concrete
63 /// type NewType and for 'this' to be deleted.
65 void refineAbstractTypeTo(const Type *NewType);
67 void dump() const { Type::dump(); }
69 // Methods for support type inquiry through isa, cast, and dyn_cast:
70 static inline bool classof(const DerivedType *T) { return true; }
71 static inline bool classof(const Type *T) {
72 return T->isDerivedType();
76 /// Class to represent integer types. Note that this class is also used to
77 /// represent the built-in integer types: Int1Ty, Int8Ty, Int16Ty, Int32Ty and
79 /// @brief Integer representation type
80 class IntegerType : public DerivedType {
82 IntegerType(unsigned NumBits) : DerivedType(IntegerTyID) {
83 setSubclassData(NumBits);
85 friend class TypeMap<IntegerValType, IntegerType>;
87 /// This enum is just used to hold constants we need for IntegerType.
89 MIN_INT_BITS = 1, ///< Minimum number of bits that can be specified
90 MAX_INT_BITS = (1<<23)-1 ///< Maximum number of bits that can be specified
91 ///< Note that bit width is stored in the Type classes SubclassData field
92 ///< which has 23 bits. This yields a maximum bit width of 8,388,607 bits.
95 /// This static method is the primary way of constructing an IntegerType.
96 /// If an IntegerType with the same NumBits value was previously instantiated,
97 /// that instance will be returned. Otherwise a new one will be created. Only
98 /// one instance with a given NumBits value is ever created.
99 /// @brief Get or create an IntegerType instance.
100 static const IntegerType* get(unsigned NumBits);
102 /// @brief Get the number of bits in this IntegerType
103 unsigned getBitWidth() const { return getSubclassData(); }
105 /// getBitMask - Return a bitmask with ones set for all of the bits
106 /// that can be set by an unsigned version of this type. This is 0xFF for
107 /// sbyte/ubyte, 0xFFFF for shorts, etc.
108 uint64_t getBitMask() const {
109 return ~uint64_t(0UL) >> (64-getPrimitiveSizeInBits());
112 /// For example, this is 0xFF for an 8 bit integer, 0xFFFF for i16, etc.
113 /// @returns a bit mask with ones set for all the bits of this type.
114 /// @brief Get a bit mask for this type.
115 APInt getMask() const {
116 return APInt::getAllOnesValue(getBitWidth());
119 /// This method determines if the width of this IntegerType is a power-of-2
120 /// in terms of 8 bit bytes.
121 /// @returns true if this is a power-of-2 byte width.
122 /// @brief Is this a power-of-2 byte-width IntegerType ?
123 bool isPowerOf2ByteWidth() const;
125 // Methods for support type inquiry through isa, cast, and dyn_cast:
126 static inline bool classof(const IntegerType *T) { return true; }
127 static inline bool classof(const Type *T) {
128 return T->getTypeID() == IntegerTyID;
133 /// FunctionType - Class to represent function types
135 class FunctionType : public DerivedType {
137 /// Function parameters can have attributes to indicate how they should be
138 /// treated by optimizations and code generation. This enumeration lists the
139 /// set of possible attributes.
140 /// @brief Function parameter attributes enumeration.
141 enum ParameterAttributes {
142 NoAttributeSet = 0, ///< No attribute value has been set
143 ZExtAttribute = 1, ///< zero extended before/after call
144 SExtAttribute = 1 << 1, ///< sign extended before/after call
145 NoReturnAttribute = 1 << 2, ///< mark the function as not returning
146 InRegAttribute = 1 << 3, ///< force argument to be passed in register
147 StructRetAttribute= 1 << 4 ///< hidden pointer to structure to return
149 typedef std::vector<ParameterAttributes> ParamAttrsList;
151 friend class TypeMap<FunctionValType, FunctionType>;
153 ParamAttrsList *ParamAttrs;
155 FunctionType(const FunctionType &); // Do not implement
156 const FunctionType &operator=(const FunctionType &); // Do not implement
157 FunctionType(const Type *Result, const std::vector<const Type*> &Params,
158 bool IsVarArgs, const ParamAttrsList &Attrs);
161 /// FunctionType::get - This static method is the primary way of constructing
164 static FunctionType *get(
165 const Type *Result, ///< The result type
166 const std::vector<const Type*> &Params, ///< The types of the parameters
167 bool isVarArg, ///< Whether this is a variable argument length function
168 const ParamAttrsList & Attrs = ParamAttrsList()
169 ///< Indicates the parameter attributes to use, if any. The 0th entry
170 ///< in the list refers to the return type. Parameters are numbered
174 inline bool isVarArg() const { return isVarArgs; }
175 inline const Type *getReturnType() const { return ContainedTys[0]; }
177 typedef std::vector<PATypeHandle>::const_iterator param_iterator;
178 param_iterator param_begin() const { return ContainedTys.begin()+1; }
179 param_iterator param_end() const { return ContainedTys.end(); }
181 // Parameter type accessors...
182 const Type *getParamType(unsigned i) const { return ContainedTys[i+1]; }
184 /// getNumParams - Return the number of fixed parameters this function type
185 /// requires. This does not consider varargs.
187 unsigned getNumParams() const { return unsigned(ContainedTys.size()-1); }
189 bool isStructReturn() const {
190 return (getNumParams() && paramHasAttr(1, StructRetAttribute));
193 /// The parameter attributes for the \p ith parameter are returned. The 0th
194 /// parameter refers to the return type of the function.
195 /// @returns The ParameterAttributes for the \p ith parameter.
196 /// @brief Get the attributes for a parameter
197 ParameterAttributes getParamAttrs(unsigned i) const;
199 /// @brief Determine if a parameter attribute is set
200 bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
201 return getParamAttrs(i) & attr;
204 /// @brief Return the number of parameter attributes this type has.
205 unsigned getNumAttrs() const {
206 return (ParamAttrs ? unsigned(ParamAttrs->size()) : 0);
209 /// @brief Convert a ParameterAttribute into its assembly text
210 static std::string getParamAttrsText(ParameterAttributes Attr);
212 // Implement the AbstractTypeUser interface.
213 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
214 virtual void typeBecameConcrete(const DerivedType *AbsTy);
216 // Methods for support type inquiry through isa, cast, and dyn_cast:
217 static inline bool classof(const FunctionType *T) { return true; }
218 static inline bool classof(const Type *T) {
219 return T->getTypeID() == FunctionTyID;
224 /// CompositeType - Common super class of ArrayType, StructType, PointerType
226 class CompositeType : public DerivedType {
228 inline CompositeType(TypeID id) : DerivedType(id) { }
231 /// getTypeAtIndex - Given an index value into the type, return the type of
234 virtual const Type *getTypeAtIndex(const Value *V) const = 0;
235 virtual bool indexValid(const Value *V) const = 0;
237 // Methods for support type inquiry through isa, cast, and dyn_cast:
238 static inline bool classof(const CompositeType *T) { return true; }
239 static inline bool classof(const Type *T) {
240 return T->getTypeID() == ArrayTyID ||
241 T->getTypeID() == StructTyID ||
242 T->getTypeID() == PointerTyID ||
243 T->getTypeID() == VectorTyID;
248 /// StructType - Class to represent struct types
250 class StructType : public CompositeType {
251 friend class TypeMap<StructValType, StructType>;
252 StructType(const StructType &); // Do not implement
253 const StructType &operator=(const StructType &); // Do not implement
254 StructType(const std::vector<const Type*> &Types, bool isPacked);
256 /// StructType::get - This static method is the primary way to create a
259 static StructType *get(const std::vector<const Type*> &Params,
260 bool isPacked=false);
262 // Iterator access to the elements
263 typedef std::vector<PATypeHandle>::const_iterator element_iterator;
264 element_iterator element_begin() const { return ContainedTys.begin(); }
265 element_iterator element_end() const { return ContainedTys.end(); }
267 // Random access to the elements
268 unsigned getNumElements() const { return unsigned(ContainedTys.size()); }
269 const Type *getElementType(unsigned N) const {
270 assert(N < ContainedTys.size() && "Element number out of range!");
271 return ContainedTys[N];
274 /// getTypeAtIndex - Given an index value into the type, return the type of
275 /// the element. For a structure type, this must be a constant value...
277 virtual const Type *getTypeAtIndex(const Value *V) const ;
278 virtual bool indexValid(const Value *V) const;
280 // Implement the AbstractTypeUser interface.
281 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
282 virtual void typeBecameConcrete(const DerivedType *AbsTy);
284 // Methods for support type inquiry through isa, cast, and dyn_cast:
285 static inline bool classof(const StructType *T) { return true; }
286 static inline bool classof(const Type *T) {
287 return T->getTypeID() == StructTyID;
290 bool isPacked() const { return getSubclassData(); }
294 /// SequentialType - This is the superclass of the array, pointer and packed
295 /// type classes. All of these represent "arrays" in memory. The array type
296 /// represents a specifically sized array, pointer types are unsized/unknown
297 /// size arrays, vector types represent specifically sized arrays that
298 /// allow for use of SIMD instructions. SequentialType holds the common
299 /// features of all, which stem from the fact that all three lay their
300 /// components out in memory identically.
302 class SequentialType : public CompositeType {
303 SequentialType(const SequentialType &); // Do not implement!
304 const SequentialType &operator=(const SequentialType &); // Do not implement!
306 SequentialType(TypeID TID, const Type *ElType) : CompositeType(TID) {
307 ContainedTys.reserve(1);
308 ContainedTys.push_back(PATypeHandle(ElType, this));
312 inline const Type *getElementType() const { return ContainedTys[0]; }
314 virtual bool indexValid(const Value *V) const;
316 /// getTypeAtIndex - Given an index value into the type, return the type of
317 /// the element. For sequential types, there is only one subtype...
319 virtual const Type *getTypeAtIndex(const Value *V) const {
320 return ContainedTys[0];
323 // Methods for support type inquiry through isa, cast, and dyn_cast:
324 static inline bool classof(const SequentialType *T) { return true; }
325 static inline bool classof(const Type *T) {
326 return T->getTypeID() == ArrayTyID ||
327 T->getTypeID() == PointerTyID ||
328 T->getTypeID() == VectorTyID;
333 /// ArrayType - Class to represent array types
335 class ArrayType : public SequentialType {
336 friend class TypeMap<ArrayValType, ArrayType>;
337 uint64_t NumElements;
339 ArrayType(const ArrayType &); // Do not implement
340 const ArrayType &operator=(const ArrayType &); // Do not implement
341 ArrayType(const Type *ElType, uint64_t NumEl);
343 /// ArrayType::get - This static method is the primary way to construct an
346 static ArrayType *get(const Type *ElementType, uint64_t NumElements);
348 inline uint64_t getNumElements() const { return NumElements; }
350 // Implement the AbstractTypeUser interface.
351 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
352 virtual void typeBecameConcrete(const DerivedType *AbsTy);
354 // Methods for support type inquiry through isa, cast, and dyn_cast:
355 static inline bool classof(const ArrayType *T) { return true; }
356 static inline bool classof(const Type *T) {
357 return T->getTypeID() == ArrayTyID;
361 /// VectorType - Class to represent vector types
363 class VectorType : public SequentialType {
364 friend class TypeMap<VectorValType, VectorType>;
365 unsigned NumElements;
367 VectorType(const VectorType &); // Do not implement
368 const VectorType &operator=(const VectorType &); // Do not implement
369 VectorType(const Type *ElType, unsigned NumEl);
371 /// VectorType::get - This static method is the primary way to construct an
374 static VectorType *get(const Type *ElementType, unsigned NumElements);
376 /// @brief Return the number of elements in the Vector type.
377 inline unsigned getNumElements() const { return NumElements; }
379 /// @brief Return the number of bits in the Vector type.
380 inline unsigned getBitWidth() const {
381 return NumElements *getElementType()->getPrimitiveSizeInBits();
384 // Implement the AbstractTypeUser interface.
385 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
386 virtual void typeBecameConcrete(const DerivedType *AbsTy);
388 // Methods for support type inquiry through isa, cast, and dyn_cast:
389 static inline bool classof(const VectorType *T) { return true; }
390 static inline bool classof(const Type *T) {
391 return T->getTypeID() == VectorTyID;
396 /// PointerType - Class to represent pointers
398 class PointerType : public SequentialType {
399 friend class TypeMap<PointerValType, PointerType>;
400 PointerType(const PointerType &); // Do not implement
401 const PointerType &operator=(const PointerType &); // Do not implement
402 PointerType(const Type *ElType);
404 /// PointerType::get - This is the only way to construct a new pointer type.
405 static PointerType *get(const Type *ElementType);
407 // Implement the AbstractTypeUser interface.
408 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
409 virtual void typeBecameConcrete(const DerivedType *AbsTy);
411 // Implement support type inquiry through isa, cast, and dyn_cast:
412 static inline bool classof(const PointerType *T) { return true; }
413 static inline bool classof(const Type *T) {
414 return T->getTypeID() == PointerTyID;
419 /// OpaqueType - Class to represent abstract types
421 class OpaqueType : public DerivedType {
422 OpaqueType(const OpaqueType &); // DO NOT IMPLEMENT
423 const OpaqueType &operator=(const OpaqueType &); // DO NOT IMPLEMENT
426 /// OpaqueType::get - Static factory method for the OpaqueType class...
428 static OpaqueType *get() {
429 return new OpaqueType(); // All opaque types are distinct
432 // Implement the AbstractTypeUser interface.
433 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
434 abort(); // FIXME: this is not really an AbstractTypeUser!
436 virtual void typeBecameConcrete(const DerivedType *AbsTy) {
437 abort(); // FIXME: this is not really an AbstractTypeUser!
440 // Implement support for type inquiry through isa, cast, and dyn_cast:
441 static inline bool classof(const OpaqueType *T) { return true; }
442 static inline bool classof(const Type *T) {
443 return T->getTypeID() == OpaqueTyID;
447 } // End llvm namespace