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;
34 class DerivedType : public Type {
38 DerivedType(TypeID id) : Type(id) {}
40 /// notifyUsesThatTypeBecameConcrete - Notify AbstractTypeUsers of this type
41 /// that the current type has transitioned from being abstract to being
44 void notifyUsesThatTypeBecameConcrete();
46 /// dropAllTypeUses - When this (abstract) type is resolved to be equal to
47 /// another (more concrete) type, we must eliminate all references to other
48 /// types, to avoid some circular reference problems.
50 void dropAllTypeUses();
54 //===--------------------------------------------------------------------===//
55 // Abstract Type handling methods - These types have special lifetimes, which
56 // are managed by (add|remove)AbstractTypeUser. See comments in
57 // AbstractTypeUser.h for more information.
59 /// refineAbstractTypeTo - This function is used to when it is discovered that
60 /// the 'this' abstract type is actually equivalent to the NewType specified.
61 /// This causes all users of 'this' to switch to reference the more concrete
62 /// type NewType and for 'this' to be deleted.
64 void refineAbstractTypeTo(const Type *NewType);
66 void dump() const { Type::dump(); }
68 // Methods for support type inquiry through isa, cast, and dyn_cast:
69 static inline bool classof(const DerivedType *T) { return true; }
70 static inline bool classof(const Type *T) {
71 return T->isDerivedType();
75 /// Class to represent integer types. Note that this class is also used to
76 /// represent the built-in integer types: Int1Ty, Int8Ty, Int16Ty, Int32Ty and
78 /// @brief Integer representation type
79 class IntegerType : public DerivedType {
81 IntegerType(unsigned NumBits) : DerivedType(IntegerTyID) {
82 setSubclassData(NumBits);
84 friend class TypeMap<IntegerValType, IntegerType>;
86 /// This enum is just used to hold constants we need for IntegerType.
88 MIN_INT_BITS = 1, ///< Minimum number of bits that can be specified
89 MAX_INT_BITS = (1<<23)-1 ///< Maximum number of bits that can be specified
90 ///< Note that bit width is stored in the Type classes SubclassData field
91 ///< which has 23 bits. This yields a maximum bit width of 8,388,607 bits.
94 /// This static method is the primary way of constructing an IntegerType.
95 /// If an IntegerType with the same NumBits value was previously instantiated,
96 /// that instance will be returned. Otherwise a new one will be created. Only
97 /// one instance with a given NumBits value is ever created.
98 /// @brief Get or create an IntegerType instance.
99 static const IntegerType* get(unsigned NumBits);
101 /// @brief Get the number of bits in this IntegerType
102 unsigned getBitWidth() const { return getSubclassData(); }
104 /// getBitMask - Return a bitmask with ones set for all of the bits
105 /// that can be set by an unsigned version of this type. This is 0xFF for
106 /// sbyte/ubyte, 0xFFFF for shorts, etc.
107 uint64_t getBitMask() const {
108 return ~uint64_t(0UL) >> (64-getPrimitiveSizeInBits());
111 /// This method determines if the width of this IntegerType is a power-of-2
112 /// in terms of 8 bit bytes.
113 /// @returns true if this is a power-of-2 byte width.
114 /// @brief Is this a power-of-2 byte-width IntegerType ?
115 bool isPowerOf2ByteWidth() const;
117 // Methods for support type inquiry through isa, cast, and dyn_cast:
118 static inline bool classof(const IntegerType *T) { return true; }
119 static inline bool classof(const Type *T) {
120 return T->getTypeID() == IntegerTyID;
125 /// FunctionType - Class to represent function types
127 class FunctionType : public DerivedType {
129 /// Function parameters can have attributes to indicate how they should be
130 /// treated by optimizations and code generation. This enumeration lists the
131 /// set of possible attributes.
132 /// @brief Function parameter attributes enumeration.
133 enum ParameterAttributes {
134 NoAttributeSet = 0, ///< No attribute value has been set
135 ZExtAttribute = 1, ///< zero extended before/after call
136 SExtAttribute = 1 << 1, ///< sign extended before/after call
137 NoReturnAttribute = 1 << 2 ///< mark the function as not returning
139 typedef std::vector<ParameterAttributes> ParamAttrsList;
141 friend class TypeMap<FunctionValType, FunctionType>;
143 ParamAttrsList *ParamAttrs;
145 FunctionType(const FunctionType &); // Do not implement
146 const FunctionType &operator=(const FunctionType &); // Do not implement
147 FunctionType(const Type *Result, const std::vector<const Type*> &Params,
148 bool IsVarArgs, const ParamAttrsList &Attrs);
151 /// FunctionType::get - This static method is the primary way of constructing
154 static FunctionType *get(
155 const Type *Result, ///< The result type
156 const std::vector<const Type*> &Params, ///< The types of the parameters
157 bool isVarArg, ///< Whether this is a variable argument length function
158 const ParamAttrsList & Attrs = ParamAttrsList()
159 ///< Indicates the parameter attributes to use, if any. The 0th entry
160 ///< in the list refers to the return type. Parameters are numbered
164 inline bool isVarArg() const { return isVarArgs; }
165 inline const Type *getReturnType() const { return ContainedTys[0]; }
167 typedef std::vector<PATypeHandle>::const_iterator param_iterator;
168 param_iterator param_begin() const { return ContainedTys.begin()+1; }
169 param_iterator param_end() const { return ContainedTys.end(); }
171 // Parameter type accessors...
172 const Type *getParamType(unsigned i) const { return ContainedTys[i+1]; }
174 /// getNumParams - Return the number of fixed parameters this function type
175 /// requires. This does not consider varargs.
177 unsigned getNumParams() const { return unsigned(ContainedTys.size()-1); }
179 /// The parameter attributes for the \p ith parameter are returned. The 0th
180 /// parameter refers to the return type of the function.
181 /// @returns The ParameterAttributes for the \p ith parameter.
182 /// @brief Get the attributes for a parameter
183 ParameterAttributes getParamAttrs(unsigned i) const;
185 /// @brief Determine if a parameter attribute is set
186 bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
187 return getParamAttrs(i) & attr;
190 /// @brief Return the number of parameter attributes this type has.
191 unsigned getNumAttrs() const {
192 return (ParamAttrs ? unsigned(ParamAttrs->size()) : 0);
195 /// @brief Convert a ParameterAttribute into its assembly text
196 static std::string getParamAttrsText(ParameterAttributes Attr);
198 // Implement the AbstractTypeUser interface.
199 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
200 virtual void typeBecameConcrete(const DerivedType *AbsTy);
202 // Methods for support type inquiry through isa, cast, and dyn_cast:
203 static inline bool classof(const FunctionType *T) { return true; }
204 static inline bool classof(const Type *T) {
205 return T->getTypeID() == FunctionTyID;
210 /// CompositeType - Common super class of ArrayType, StructType, PointerType
212 class CompositeType : public DerivedType {
214 inline CompositeType(TypeID id) : DerivedType(id) { }
217 /// getTypeAtIndex - Given an index value into the type, return the type of
220 virtual const Type *getTypeAtIndex(const Value *V) const = 0;
221 virtual bool indexValid(const Value *V) const = 0;
223 // Methods for support type inquiry through isa, cast, and dyn_cast:
224 static inline bool classof(const CompositeType *T) { return true; }
225 static inline bool classof(const Type *T) {
226 return T->getTypeID() == ArrayTyID ||
227 T->getTypeID() == StructTyID ||
228 T->getTypeID() == PointerTyID ||
229 T->getTypeID() == PackedTyID;
234 /// StructType - Class to represent struct types
236 class StructType : public CompositeType {
237 friend class TypeMap<StructValType, StructType>;
238 StructType(const StructType &); // Do not implement
239 const StructType &operator=(const StructType &); // Do not implement
240 StructType(const std::vector<const Type*> &Types, bool isPacked);
242 /// StructType::get - This static method is the primary way to create a
245 static StructType *get(const std::vector<const Type*> &Params,
246 bool isPacked=false);
248 // Iterator access to the elements
249 typedef std::vector<PATypeHandle>::const_iterator element_iterator;
250 element_iterator element_begin() const { return ContainedTys.begin(); }
251 element_iterator element_end() const { return ContainedTys.end(); }
253 // Random access to the elements
254 unsigned getNumElements() const { return unsigned(ContainedTys.size()); }
255 const Type *getElementType(unsigned N) const {
256 assert(N < ContainedTys.size() && "Element number out of range!");
257 return ContainedTys[N];
260 /// getTypeAtIndex - Given an index value into the type, return the type of
261 /// the element. For a structure type, this must be a constant value...
263 virtual const Type *getTypeAtIndex(const Value *V) const ;
264 virtual bool indexValid(const Value *V) const;
266 // Implement the AbstractTypeUser interface.
267 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
268 virtual void typeBecameConcrete(const DerivedType *AbsTy);
270 // Methods for support type inquiry through isa, cast, and dyn_cast:
271 static inline bool classof(const StructType *T) { return true; }
272 static inline bool classof(const Type *T) {
273 return T->getTypeID() == StructTyID;
276 bool isPacked() const { return getSubclassData(); }
280 /// SequentialType - This is the superclass of the array, pointer and packed
281 /// type classes. All of these represent "arrays" in memory. The array type
282 /// represents a specifically sized array, pointer types are unsized/unknown
283 /// size arrays, packed types represent specifically sized arrays that
284 /// allow for use of SIMD instructions. SequentialType holds the common
285 /// features of all, which stem from the fact that all three lay their
286 /// components out in memory identically.
288 class SequentialType : public CompositeType {
289 SequentialType(const SequentialType &); // Do not implement!
290 const SequentialType &operator=(const SequentialType &); // Do not implement!
292 SequentialType(TypeID TID, const Type *ElType) : CompositeType(TID) {
293 ContainedTys.reserve(1);
294 ContainedTys.push_back(PATypeHandle(ElType, this));
298 inline const Type *getElementType() const { return ContainedTys[0]; }
300 virtual bool indexValid(const Value *V) const;
302 /// getTypeAtIndex - Given an index value into the type, return the type of
303 /// the element. For sequential types, there is only one subtype...
305 virtual const Type *getTypeAtIndex(const Value *V) const {
306 return ContainedTys[0];
309 // Methods for support type inquiry through isa, cast, and dyn_cast:
310 static inline bool classof(const SequentialType *T) { return true; }
311 static inline bool classof(const Type *T) {
312 return T->getTypeID() == ArrayTyID ||
313 T->getTypeID() == PointerTyID ||
314 T->getTypeID() == PackedTyID;
319 /// ArrayType - Class to represent array types
321 class ArrayType : public SequentialType {
322 friend class TypeMap<ArrayValType, ArrayType>;
323 uint64_t NumElements;
325 ArrayType(const ArrayType &); // Do not implement
326 const ArrayType &operator=(const ArrayType &); // Do not implement
327 ArrayType(const Type *ElType, uint64_t NumEl);
329 /// ArrayType::get - This static method is the primary way to construct an
332 static ArrayType *get(const Type *ElementType, uint64_t NumElements);
334 inline uint64_t getNumElements() const { return NumElements; }
336 // Implement the AbstractTypeUser interface.
337 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
338 virtual void typeBecameConcrete(const DerivedType *AbsTy);
340 // Methods for support type inquiry through isa, cast, and dyn_cast:
341 static inline bool classof(const ArrayType *T) { return true; }
342 static inline bool classof(const Type *T) {
343 return T->getTypeID() == ArrayTyID;
347 /// PackedType - Class to represent packed types
349 class PackedType : public SequentialType {
350 friend class TypeMap<PackedValType, PackedType>;
351 unsigned NumElements;
353 PackedType(const PackedType &); // Do not implement
354 const PackedType &operator=(const PackedType &); // Do not implement
355 PackedType(const Type *ElType, unsigned NumEl);
357 /// PackedType::get - This static method is the primary way to construct an
360 static PackedType *get(const Type *ElementType, unsigned NumElements);
362 /// @brief Return the number of elements in the Packed type.
363 inline unsigned getNumElements() const { return NumElements; }
365 /// @brief Return the number of bits in the Packed type.
366 inline unsigned getBitWidth() const {
367 return NumElements *getElementType()->getPrimitiveSizeInBits();
370 // Implement the AbstractTypeUser interface.
371 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
372 virtual void typeBecameConcrete(const DerivedType *AbsTy);
374 // Methods for support type inquiry through isa, cast, and dyn_cast:
375 static inline bool classof(const PackedType *T) { return true; }
376 static inline bool classof(const Type *T) {
377 return T->getTypeID() == PackedTyID;
382 /// PointerType - Class to represent pointers
384 class PointerType : public SequentialType {
385 friend class TypeMap<PointerValType, PointerType>;
386 PointerType(const PointerType &); // Do not implement
387 const PointerType &operator=(const PointerType &); // Do not implement
388 PointerType(const Type *ElType);
390 /// PointerType::get - This is the only way to construct a new pointer type.
391 static PointerType *get(const Type *ElementType);
393 // Implement the AbstractTypeUser interface.
394 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
395 virtual void typeBecameConcrete(const DerivedType *AbsTy);
397 // Implement support type inquiry through isa, cast, and dyn_cast:
398 static inline bool classof(const PointerType *T) { return true; }
399 static inline bool classof(const Type *T) {
400 return T->getTypeID() == PointerTyID;
405 /// OpaqueType - Class to represent abstract types
407 class OpaqueType : public DerivedType {
408 OpaqueType(const OpaqueType &); // DO NOT IMPLEMENT
409 const OpaqueType &operator=(const OpaqueType &); // DO NOT IMPLEMENT
412 /// OpaqueType::get - Static factory method for the OpaqueType class...
414 static OpaqueType *get() {
415 return new OpaqueType(); // All opaque types are distinct
418 // Implement the AbstractTypeUser interface.
419 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
420 abort(); // FIXME: this is not really an AbstractTypeUser!
422 virtual void typeBecameConcrete(const DerivedType *AbsTy) {
423 abort(); // FIXME: this is not really an AbstractTypeUser!
426 // Implement support for type inquiry through isa, cast, and dyn_cast:
427 static inline bool classof(const OpaqueType *T) { return true; }
428 static inline bool classof(const Type *T) {
429 return T->getTypeID() == OpaqueTyID;
433 } // End llvm namespace