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"
26 template<class ValType, class TypeClass> class TypeMap;
27 class FunctionValType;
35 class DerivedType : public Type {
39 explicit 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 explicit 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-getBitWidth());
112 /// getSignBit - Return a uint64_t with just the most significant bit set (the
113 /// sign bit, if the value is treated as a signed number).
114 uint64_t getSignBit() const {
115 return 1ULL << (getBitWidth()-1);
118 /// For example, this is 0xFF for an 8 bit integer, 0xFFFF for i16, etc.
119 /// @returns a bit mask with ones set for all the bits of this type.
120 /// @brief Get a bit mask for this type.
121 APInt getMask() const;
123 /// This method determines if the width of this IntegerType is a power-of-2
124 /// in terms of 8 bit bytes.
125 /// @returns true if this is a power-of-2 byte width.
126 /// @brief Is this a power-of-2 byte-width IntegerType ?
127 bool isPowerOf2ByteWidth() const;
129 // Methods for support type inquiry through isa, cast, and dyn_cast:
130 static inline bool classof(const IntegerType *T) { return true; }
131 static inline bool classof(const Type *T) {
132 return T->getTypeID() == IntegerTyID;
137 /// FunctionType - Class to represent function types
139 class FunctionType : public DerivedType {
141 /// Function parameters can have attributes to indicate how they should be
142 /// treated by optimizations and code generation. This enumeration lists the
143 /// set of possible attributes.
144 /// @brief Function parameter attributes enumeration.
145 enum ParameterAttributes {
146 NoAttributeSet = 0, ///< No attribute value has been set
147 ZExtAttribute = 1, ///< zero extended before/after call
148 SExtAttribute = 1 << 1, ///< sign extended before/after call
149 NoReturnAttribute = 1 << 2, ///< mark the function as not returning
150 InRegAttribute = 1 << 3, ///< force argument to be passed in register
151 StructRetAttribute= 1 << 4, ///< hidden pointer to structure to return
152 NoUnwindAttribute = 1 << 5 ///< Function doesn't unwind stack
154 typedef std::vector<ParameterAttributes> ParamAttrsList;
156 friend class TypeMap<FunctionValType, FunctionType>;
158 ParamAttrsList *ParamAttrs;
160 FunctionType(const FunctionType &); // Do not implement
161 const FunctionType &operator=(const FunctionType &); // Do not implement
162 FunctionType(const Type *Result, const std::vector<const Type*> &Params,
163 bool IsVarArgs, const ParamAttrsList &Attrs);
166 /// FunctionType::get - This static method is the primary way of constructing
169 static FunctionType *get(
170 const Type *Result, ///< The result type
171 const std::vector<const Type*> &Params, ///< The types of the parameters
172 bool isVarArg, ///< Whether this is a variable argument length function
173 const ParamAttrsList & Attrs = ParamAttrsList()
174 ///< Indicates the parameter attributes to use, if any. The 0th entry
175 ///< in the list refers to the return type. Parameters are numbered
179 inline bool isVarArg() const { return isVarArgs; }
180 inline const Type *getReturnType() const { return ContainedTys[0]; }
182 typedef std::vector<PATypeHandle>::const_iterator param_iterator;
183 param_iterator param_begin() const { return ContainedTys.begin()+1; }
184 param_iterator param_end() const { return ContainedTys.end(); }
186 // Parameter type accessors...
187 const Type *getParamType(unsigned i) const { return ContainedTys[i+1]; }
189 /// getNumParams - Return the number of fixed parameters this function type
190 /// requires. This does not consider varargs.
192 unsigned getNumParams() const { return unsigned(ContainedTys.size()-1); }
194 bool isStructReturn() const {
195 return (getNumParams() && paramHasAttr(1, StructRetAttribute));
198 /// The parameter attributes for the \p ith parameter are returned. The 0th
199 /// parameter refers to the return type of the function.
200 /// @returns The ParameterAttributes for the \p ith parameter.
201 /// @brief Get the attributes for a parameter
202 ParameterAttributes getParamAttrs(unsigned i) const;
204 /// @brief Determine if a parameter attribute is set
205 bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
206 return getParamAttrs(i) & attr;
209 /// @brief Return the number of parameter attributes this type has.
210 unsigned getNumAttrs() const {
211 return (ParamAttrs ? unsigned(ParamAttrs->size()) : 0);
214 /// @brief Convert a ParameterAttribute into its assembly text
215 static std::string getParamAttrsText(ParameterAttributes Attr);
217 // Implement the AbstractTypeUser interface.
218 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
219 virtual void typeBecameConcrete(const DerivedType *AbsTy);
221 // Methods for support type inquiry through isa, cast, and dyn_cast:
222 static inline bool classof(const FunctionType *T) { return true; }
223 static inline bool classof(const Type *T) {
224 return T->getTypeID() == FunctionTyID;
229 /// CompositeType - Common super class of ArrayType, StructType, PointerType
231 class CompositeType : public DerivedType {
233 inline explicit CompositeType(TypeID id) : DerivedType(id) { }
236 /// getTypeAtIndex - Given an index value into the type, return the type of
239 virtual const Type *getTypeAtIndex(const Value *V) const = 0;
240 virtual bool indexValid(const Value *V) const = 0;
242 // Methods for support type inquiry through isa, cast, and dyn_cast:
243 static inline bool classof(const CompositeType *T) { return true; }
244 static inline bool classof(const Type *T) {
245 return T->getTypeID() == ArrayTyID ||
246 T->getTypeID() == StructTyID ||
247 T->getTypeID() == PointerTyID ||
248 T->getTypeID() == VectorTyID;
253 /// StructType - Class to represent struct types
255 class StructType : public CompositeType {
256 friend class TypeMap<StructValType, StructType>;
257 StructType(const StructType &); // Do not implement
258 const StructType &operator=(const StructType &); // Do not implement
259 StructType(const std::vector<const Type*> &Types, bool isPacked);
261 /// StructType::get - This static method is the primary way to create a
264 static StructType *get(const std::vector<const Type*> &Params,
265 bool isPacked=false);
267 // Iterator access to the elements
268 typedef std::vector<PATypeHandle>::const_iterator element_iterator;
269 element_iterator element_begin() const { return ContainedTys.begin(); }
270 element_iterator element_end() const { return ContainedTys.end(); }
272 // Random access to the elements
273 unsigned getNumElements() const { return unsigned(ContainedTys.size()); }
274 const Type *getElementType(unsigned N) const {
275 assert(N < ContainedTys.size() && "Element number out of range!");
276 return ContainedTys[N];
279 /// getTypeAtIndex - Given an index value into the type, return the type of
280 /// the element. For a structure type, this must be a constant value...
282 virtual const Type *getTypeAtIndex(const Value *V) const ;
283 virtual bool indexValid(const Value *V) const;
285 // Implement the AbstractTypeUser interface.
286 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
287 virtual void typeBecameConcrete(const DerivedType *AbsTy);
289 // Methods for support type inquiry through isa, cast, and dyn_cast:
290 static inline bool classof(const StructType *T) { return true; }
291 static inline bool classof(const Type *T) {
292 return T->getTypeID() == StructTyID;
295 bool isPacked() const { return getSubclassData(); }
299 /// SequentialType - This is the superclass of the array, pointer and packed
300 /// type classes. All of these represent "arrays" in memory. The array type
301 /// represents a specifically sized array, pointer types are unsized/unknown
302 /// size arrays, vector types represent specifically sized arrays that
303 /// allow for use of SIMD instructions. SequentialType holds the common
304 /// features of all, which stem from the fact that all three lay their
305 /// components out in memory identically.
307 class SequentialType : public CompositeType {
308 SequentialType(const SequentialType &); // Do not implement!
309 const SequentialType &operator=(const SequentialType &); // Do not implement!
311 SequentialType(TypeID TID, const Type *ElType) : CompositeType(TID) {
312 ContainedTys.reserve(1);
313 ContainedTys.push_back(PATypeHandle(ElType, this));
317 inline const Type *getElementType() const { return ContainedTys[0]; }
319 virtual bool indexValid(const Value *V) const;
321 /// getTypeAtIndex - Given an index value into the type, return the type of
322 /// the element. For sequential types, there is only one subtype...
324 virtual const Type *getTypeAtIndex(const Value *V) const {
325 return ContainedTys[0];
328 // Methods for support type inquiry through isa, cast, and dyn_cast:
329 static inline bool classof(const SequentialType *T) { return true; }
330 static inline bool classof(const Type *T) {
331 return T->getTypeID() == ArrayTyID ||
332 T->getTypeID() == PointerTyID ||
333 T->getTypeID() == VectorTyID;
338 /// ArrayType - Class to represent array types
340 class ArrayType : public SequentialType {
341 friend class TypeMap<ArrayValType, ArrayType>;
342 uint64_t NumElements;
344 ArrayType(const ArrayType &); // Do not implement
345 const ArrayType &operator=(const ArrayType &); // Do not implement
346 ArrayType(const Type *ElType, uint64_t NumEl);
348 /// ArrayType::get - This static method is the primary way to construct an
351 static ArrayType *get(const Type *ElementType, uint64_t NumElements);
353 inline uint64_t getNumElements() const { return NumElements; }
355 // Implement the AbstractTypeUser interface.
356 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
357 virtual void typeBecameConcrete(const DerivedType *AbsTy);
359 // Methods for support type inquiry through isa, cast, and dyn_cast:
360 static inline bool classof(const ArrayType *T) { return true; }
361 static inline bool classof(const Type *T) {
362 return T->getTypeID() == ArrayTyID;
366 /// VectorType - Class to represent vector types
368 class VectorType : public SequentialType {
369 friend class TypeMap<VectorValType, VectorType>;
370 unsigned NumElements;
372 VectorType(const VectorType &); // Do not implement
373 const VectorType &operator=(const VectorType &); // Do not implement
374 VectorType(const Type *ElType, unsigned NumEl);
376 /// VectorType::get - This static method is the primary way to construct an
379 static VectorType *get(const Type *ElementType, unsigned NumElements);
381 /// @brief Return the number of elements in the Vector type.
382 inline unsigned getNumElements() const { return NumElements; }
384 /// @brief Return the number of bits in the Vector type.
385 inline unsigned getBitWidth() const {
386 return NumElements *getElementType()->getPrimitiveSizeInBits();
389 // Implement the AbstractTypeUser interface.
390 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
391 virtual void typeBecameConcrete(const DerivedType *AbsTy);
393 // Methods for support type inquiry through isa, cast, and dyn_cast:
394 static inline bool classof(const VectorType *T) { return true; }
395 static inline bool classof(const Type *T) {
396 return T->getTypeID() == VectorTyID;
401 /// PointerType - Class to represent pointers
403 class PointerType : public SequentialType {
404 friend class TypeMap<PointerValType, PointerType>;
405 PointerType(const PointerType &); // Do not implement
406 const PointerType &operator=(const PointerType &); // Do not implement
407 explicit PointerType(const Type *ElType);
409 /// PointerType::get - This is the only way to construct a new pointer type.
410 static PointerType *get(const Type *ElementType);
412 // Implement the AbstractTypeUser interface.
413 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
414 virtual void typeBecameConcrete(const DerivedType *AbsTy);
416 // Implement support type inquiry through isa, cast, and dyn_cast:
417 static inline bool classof(const PointerType *T) { return true; }
418 static inline bool classof(const Type *T) {
419 return T->getTypeID() == PointerTyID;
424 /// OpaqueType - Class to represent abstract types
426 class OpaqueType : public DerivedType {
427 OpaqueType(const OpaqueType &); // DO NOT IMPLEMENT
428 const OpaqueType &operator=(const OpaqueType &); // DO NOT IMPLEMENT
431 /// OpaqueType::get - Static factory method for the OpaqueType class...
433 static OpaqueType *get() {
434 return new OpaqueType(); // All opaque types are distinct
437 // Implement the AbstractTypeUser interface.
438 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
439 abort(); // FIXME: this is not really an AbstractTypeUser!
441 virtual void typeBecameConcrete(const DerivedType *AbsTy) {
442 abort(); // FIXME: this is not really an AbstractTypeUser!
445 // Implement support for type inquiry through isa, cast, and dyn_cast:
446 static inline bool classof(const OpaqueType *T) { return true; }
447 static inline bool classof(const Type *T) {
448 return T->getTypeID() == OpaqueTyID;
452 } // End llvm namespace