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 // Methods for support type inquiry through isa, cast, and dyn_cast:
105 static inline bool classof(const IntegerType *T) { return true; }
106 static inline bool classof(const Type *T) { return T->isIntegral(); }
110 /// FunctionType - Class to represent function types
112 class FunctionType : public DerivedType {
114 /// Function parameters can have attributes to indicate how they should be
115 /// treated by optimizations and code generation. This enumeration lists the
116 /// set of possible attributes.
117 /// @brief Function parameter attributes enumeration.
118 enum ParameterAttributes {
119 NoAttributeSet = 0, ///< No attribute value has been set
120 ZExtAttribute = 1, ///< zero extended before/after call
121 SExtAttribute = 1 << 1, ///< sign extended before/after call
122 NoReturnAttribute = 1 << 2 ///< mark the function as not returning
124 typedef std::vector<ParameterAttributes> ParamAttrsList;
126 friend class TypeMap<FunctionValType, FunctionType>;
128 ParamAttrsList *ParamAttrs;
130 FunctionType(const FunctionType &); // Do not implement
131 const FunctionType &operator=(const FunctionType &); // Do not implement
132 FunctionType(const Type *Result, const std::vector<const Type*> &Params,
133 bool IsVarArgs, const ParamAttrsList &Attrs);
136 /// FunctionType::get - This static method is the primary way of constructing
139 static FunctionType *get(
140 const Type *Result, ///< The result type
141 const std::vector<const Type*> &Params, ///< The types of the parameters
142 bool isVarArg, ///< Whether this is a variable argument length function
143 const ParamAttrsList & Attrs = ParamAttrsList()
144 ///< Indicates the parameter attributes to use, if any. The 0th entry
145 ///< in the list refers to the return type. Parameters are numbered
149 inline bool isVarArg() const { return isVarArgs; }
150 inline const Type *getReturnType() const { return ContainedTys[0]; }
152 typedef std::vector<PATypeHandle>::const_iterator param_iterator;
153 param_iterator param_begin() const { return ContainedTys.begin()+1; }
154 param_iterator param_end() const { return ContainedTys.end(); }
156 // Parameter type accessors...
157 const Type *getParamType(unsigned i) const { return ContainedTys[i+1]; }
159 /// getNumParams - Return the number of fixed parameters this function type
160 /// requires. This does not consider varargs.
162 unsigned getNumParams() const { return unsigned(ContainedTys.size()-1); }
164 /// The parameter attributes for the \p ith parameter are returned. The 0th
165 /// parameter refers to the return type of the function.
166 /// @returns The ParameterAttributes for the \p ith parameter.
167 /// @brief Get the attributes for a parameter
168 ParameterAttributes getParamAttrs(unsigned i) const;
170 /// @brief Determine if a parameter attribute is set
171 bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
172 return getParamAttrs(i) & attr;
175 /// @brief Return the number of parameter attributes this type has.
176 unsigned getNumAttrs() const {
177 return (ParamAttrs ? unsigned(ParamAttrs->size()) : 0);
180 /// @brief Convert a ParameterAttribute into its assembly text
181 static std::string getParamAttrsText(ParameterAttributes Attr);
183 // Implement the AbstractTypeUser interface.
184 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
185 virtual void typeBecameConcrete(const DerivedType *AbsTy);
187 // Methods for support type inquiry through isa, cast, and dyn_cast:
188 static inline bool classof(const FunctionType *T) { return true; }
189 static inline bool classof(const Type *T) {
190 return T->getTypeID() == FunctionTyID;
195 /// CompositeType - Common super class of ArrayType, StructType, PointerType
197 class CompositeType : public DerivedType {
199 inline CompositeType(TypeID id) : DerivedType(id) { }
202 /// getTypeAtIndex - Given an index value into the type, return the type of
205 virtual const Type *getTypeAtIndex(const Value *V) const = 0;
206 virtual bool indexValid(const Value *V) const = 0;
208 // Methods for support type inquiry through isa, cast, and dyn_cast:
209 static inline bool classof(const CompositeType *T) { return true; }
210 static inline bool classof(const Type *T) {
211 return T->getTypeID() == ArrayTyID ||
212 T->getTypeID() == StructTyID ||
213 T->getTypeID() == PointerTyID ||
214 T->getTypeID() == PackedTyID;
219 /// StructType - Class to represent struct types
221 class StructType : public CompositeType {
222 friend class TypeMap<StructValType, StructType>;
223 StructType(const StructType &); // Do not implement
224 const StructType &operator=(const StructType &); // Do not implement
225 StructType(const std::vector<const Type*> &Types, bool isPacked);
227 /// StructType::get - This static method is the primary way to create a
230 static StructType *get(const std::vector<const Type*> &Params,
231 bool isPacked=false);
233 // Iterator access to the elements
234 typedef std::vector<PATypeHandle>::const_iterator element_iterator;
235 element_iterator element_begin() const { return ContainedTys.begin(); }
236 element_iterator element_end() const { return ContainedTys.end(); }
238 // Random access to the elements
239 unsigned getNumElements() const { return unsigned(ContainedTys.size()); }
240 const Type *getElementType(unsigned N) const {
241 assert(N < ContainedTys.size() && "Element number out of range!");
242 return ContainedTys[N];
245 /// getTypeAtIndex - Given an index value into the type, return the type of
246 /// the element. For a structure type, this must be a constant value...
248 virtual const Type *getTypeAtIndex(const Value *V) const ;
249 virtual bool indexValid(const Value *V) const;
251 // Implement the AbstractTypeUser interface.
252 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
253 virtual void typeBecameConcrete(const DerivedType *AbsTy);
255 // Methods for support type inquiry through isa, cast, and dyn_cast:
256 static inline bool classof(const StructType *T) { return true; }
257 static inline bool classof(const Type *T) {
258 return T->getTypeID() == StructTyID;
261 bool isPacked() const { return getSubclassData(); }
265 /// SequentialType - This is the superclass of the array, pointer and packed
266 /// type classes. All of these represent "arrays" in memory. The array type
267 /// represents a specifically sized array, pointer types are unsized/unknown
268 /// size arrays, packed types represent specifically sized arrays that
269 /// allow for use of SIMD instructions. SequentialType holds the common
270 /// features of all, which stem from the fact that all three lay their
271 /// components out in memory identically.
273 class SequentialType : public CompositeType {
274 SequentialType(const SequentialType &); // Do not implement!
275 const SequentialType &operator=(const SequentialType &); // Do not implement!
277 SequentialType(TypeID TID, const Type *ElType) : CompositeType(TID) {
278 ContainedTys.reserve(1);
279 ContainedTys.push_back(PATypeHandle(ElType, this));
283 inline const Type *getElementType() const { return ContainedTys[0]; }
285 virtual bool indexValid(const Value *V) const;
287 /// getTypeAtIndex - Given an index value into the type, return the type of
288 /// the element. For sequential types, there is only one subtype...
290 virtual const Type *getTypeAtIndex(const Value *V) const {
291 return ContainedTys[0];
294 // Methods for support type inquiry through isa, cast, and dyn_cast:
295 static inline bool classof(const SequentialType *T) { return true; }
296 static inline bool classof(const Type *T) {
297 return T->getTypeID() == ArrayTyID ||
298 T->getTypeID() == PointerTyID ||
299 T->getTypeID() == PackedTyID;
304 /// ArrayType - Class to represent array types
306 class ArrayType : public SequentialType {
307 friend class TypeMap<ArrayValType, ArrayType>;
308 uint64_t NumElements;
310 ArrayType(const ArrayType &); // Do not implement
311 const ArrayType &operator=(const ArrayType &); // Do not implement
312 ArrayType(const Type *ElType, uint64_t NumEl);
314 /// ArrayType::get - This static method is the primary way to construct an
317 static ArrayType *get(const Type *ElementType, uint64_t NumElements);
319 inline uint64_t getNumElements() const { return NumElements; }
321 // Implement the AbstractTypeUser interface.
322 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
323 virtual void typeBecameConcrete(const DerivedType *AbsTy);
325 // Methods for support type inquiry through isa, cast, and dyn_cast:
326 static inline bool classof(const ArrayType *T) { return true; }
327 static inline bool classof(const Type *T) {
328 return T->getTypeID() == ArrayTyID;
332 /// PackedType - Class to represent packed types
334 class PackedType : public SequentialType {
335 friend class TypeMap<PackedValType, PackedType>;
336 unsigned NumElements;
338 PackedType(const PackedType &); // Do not implement
339 const PackedType &operator=(const PackedType &); // Do not implement
340 PackedType(const Type *ElType, unsigned NumEl);
342 /// PackedType::get - This static method is the primary way to construct an
345 static PackedType *get(const Type *ElementType, unsigned NumElements);
347 /// @brief Return the number of elements in the Packed type.
348 inline unsigned getNumElements() const { return NumElements; }
350 /// @brief Return the number of bits in the Packed type.
351 inline unsigned getBitWidth() const {
352 return NumElements *getElementType()->getPrimitiveSizeInBits();
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 PackedType *T) { return true; }
361 static inline bool classof(const Type *T) {
362 return T->getTypeID() == PackedTyID;
367 /// PointerType - Class to represent pointers
369 class PointerType : public SequentialType {
370 friend class TypeMap<PointerValType, PointerType>;
371 PointerType(const PointerType &); // Do not implement
372 const PointerType &operator=(const PointerType &); // Do not implement
373 PointerType(const Type *ElType);
375 /// PointerType::get - This is the only way to construct a new pointer type.
376 static PointerType *get(const Type *ElementType);
378 // Implement the AbstractTypeUser interface.
379 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
380 virtual void typeBecameConcrete(const DerivedType *AbsTy);
382 // Implement support type inquiry through isa, cast, and dyn_cast:
383 static inline bool classof(const PointerType *T) { return true; }
384 static inline bool classof(const Type *T) {
385 return T->getTypeID() == PointerTyID;
390 /// OpaqueType - Class to represent abstract types
392 class OpaqueType : public DerivedType {
393 OpaqueType(const OpaqueType &); // DO NOT IMPLEMENT
394 const OpaqueType &operator=(const OpaqueType &); // DO NOT IMPLEMENT
397 /// OpaqueType::get - Static factory method for the OpaqueType class...
399 static OpaqueType *get() {
400 return new OpaqueType(); // All opaque types are distinct
403 // Implement the AbstractTypeUser interface.
404 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
405 abort(); // FIXME: this is not really an AbstractTypeUser!
407 virtual void typeBecameConcrete(const DerivedType *AbsTy) {
408 abort(); // FIXME: this is not really an AbstractTypeUser!
411 // Implement support for type inquiry through isa, cast, and dyn_cast:
412 static inline bool classof(const OpaqueType *T) { return true; }
413 static inline bool classof(const Type *T) {
414 return T->getTypeID() == OpaqueTyID;
418 } // End llvm namespace