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 virtual ~FunctionType() { delete ParamAttrs; }
167 /// FunctionType::get - This static method is the primary way of constructing
170 static FunctionType *get(
171 const Type *Result, ///< The result type
172 const std::vector<const Type*> &Params, ///< The types of the parameters
173 bool isVarArg, ///< Whether this is a variable argument length function
174 const ParamAttrsList & Attrs = ParamAttrsList()
175 ///< Indicates the parameter attributes to use, if any. The 0th entry
176 ///< in the list refers to the return type. Parameters are numbered
180 inline bool isVarArg() const { return isVarArgs; }
181 inline const Type *getReturnType() const { return ContainedTys[0]; }
183 typedef Type::subtype_iterator param_iterator;
184 param_iterator param_begin() const { return ContainedTys + 1; }
185 param_iterator param_end() const { return &ContainedTys[NumContainedTys]; }
187 // Parameter type accessors...
188 const Type *getParamType(unsigned i) const { return ContainedTys[i+1]; }
190 /// getNumParams - Return the number of fixed parameters this function type
191 /// requires. This does not consider varargs.
193 unsigned getNumParams() const { return NumContainedTys - 1; }
195 bool isStructReturn() const {
196 return (getNumParams() && paramHasAttr(1, StructRetAttribute));
199 /// The parameter attributes for the \p ith parameter are returned. The 0th
200 /// parameter refers to the return type of the function.
201 /// @returns The ParameterAttributes for the \p ith parameter.
202 /// @brief Get the attributes for a parameter
203 ParameterAttributes getParamAttrs(unsigned i) const;
205 /// @brief Determine if a parameter attribute is set
206 bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
207 return getParamAttrs(i) & attr;
210 /// @brief Return the number of parameter attributes this type has.
211 unsigned getNumAttrs() const {
212 return (ParamAttrs ? unsigned(ParamAttrs->size()) : 0);
215 /// @brief Convert a ParameterAttribute into its assembly text
216 static std::string getParamAttrsText(ParameterAttributes Attr);
218 // Implement the AbstractTypeUser interface.
219 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
220 virtual void typeBecameConcrete(const DerivedType *AbsTy);
222 // Methods for support type inquiry through isa, cast, and dyn_cast:
223 static inline bool classof(const FunctionType *T) { return true; }
224 static inline bool classof(const Type *T) {
225 return T->getTypeID() == FunctionTyID;
230 /// CompositeType - Common super class of ArrayType, StructType, PointerType
232 class CompositeType : public DerivedType {
234 inline explicit CompositeType(TypeID id) : DerivedType(id) { }
237 /// getTypeAtIndex - Given an index value into the type, return the type of
240 virtual const Type *getTypeAtIndex(const Value *V) const = 0;
241 virtual bool indexValid(const Value *V) const = 0;
243 // Methods for support type inquiry through isa, cast, and dyn_cast:
244 static inline bool classof(const CompositeType *T) { return true; }
245 static inline bool classof(const Type *T) {
246 return T->getTypeID() == ArrayTyID ||
247 T->getTypeID() == StructTyID ||
248 T->getTypeID() == PointerTyID ||
249 T->getTypeID() == VectorTyID;
254 /// StructType - Class to represent struct types
256 class StructType : public CompositeType {
257 friend class TypeMap<StructValType, StructType>;
258 StructType(const StructType &); // Do not implement
259 const StructType &operator=(const StructType &); // Do not implement
260 StructType(const std::vector<const Type*> &Types, bool isPacked);
262 /// StructType::get - This static method is the primary way to create a
265 static StructType *get(const std::vector<const Type*> &Params,
266 bool isPacked=false);
268 // Iterator access to the elements
269 typedef Type::subtype_iterator element_iterator;
270 element_iterator element_begin() const { return ContainedTys; }
271 element_iterator element_end() const { return &ContainedTys[NumContainedTys];}
273 // Random access to the elements
274 unsigned getNumElements() const { return NumContainedTys; }
275 const Type *getElementType(unsigned N) const {
276 assert(N < NumContainedTys && "Element number out of range!");
277 return ContainedTys[N];
280 /// getTypeAtIndex - Given an index value into the type, return the type of
281 /// the element. For a structure type, this must be a constant value...
283 virtual const Type *getTypeAtIndex(const Value *V) const ;
284 virtual bool indexValid(const Value *V) const;
286 // Implement the AbstractTypeUser interface.
287 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
288 virtual void typeBecameConcrete(const DerivedType *AbsTy);
290 // Methods for support type inquiry through isa, cast, and dyn_cast:
291 static inline bool classof(const StructType *T) { return true; }
292 static inline bool classof(const Type *T) {
293 return T->getTypeID() == StructTyID;
296 bool isPacked() const { return getSubclassData(); }
300 /// SequentialType - This is the superclass of the array, pointer and packed
301 /// type classes. All of these represent "arrays" in memory. The array type
302 /// represents a specifically sized array, pointer types are unsized/unknown
303 /// size arrays, vector types represent specifically sized arrays that
304 /// allow for use of SIMD instructions. SequentialType holds the common
305 /// features of all, which stem from the fact that all three lay their
306 /// components out in memory identically.
308 class SequentialType : public CompositeType {
309 PATypeHandle ContainedType; ///< Storage for the single contained type
310 SequentialType(const SequentialType &); // Do not implement!
311 const SequentialType &operator=(const SequentialType &); // Do not implement!
313 SequentialType(TypeID TID, const Type *ElType)
314 : CompositeType(TID), ContainedType(ElType, this) {
315 ContainedTys = &ContainedType;
320 inline const Type *getElementType() const { return ContainedTys[0]; }
322 virtual bool indexValid(const Value *V) const;
324 /// getTypeAtIndex - Given an index value into the type, return the type of
325 /// the element. For sequential types, there is only one subtype...
327 virtual const Type *getTypeAtIndex(const Value *V) const {
328 return ContainedTys[0];
331 // Methods for support type inquiry through isa, cast, and dyn_cast:
332 static inline bool classof(const SequentialType *T) { return true; }
333 static inline bool classof(const Type *T) {
334 return T->getTypeID() == ArrayTyID ||
335 T->getTypeID() == PointerTyID ||
336 T->getTypeID() == VectorTyID;
341 /// ArrayType - Class to represent array types
343 class ArrayType : public SequentialType {
344 friend class TypeMap<ArrayValType, ArrayType>;
345 uint64_t NumElements;
347 ArrayType(const ArrayType &); // Do not implement
348 const ArrayType &operator=(const ArrayType &); // Do not implement
349 ArrayType(const Type *ElType, uint64_t NumEl);
351 /// ArrayType::get - This static method is the primary way to construct an
354 static ArrayType *get(const Type *ElementType, uint64_t NumElements);
356 inline uint64_t getNumElements() const { return NumElements; }
358 // Implement the AbstractTypeUser interface.
359 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
360 virtual void typeBecameConcrete(const DerivedType *AbsTy);
362 // Methods for support type inquiry through isa, cast, and dyn_cast:
363 static inline bool classof(const ArrayType *T) { return true; }
364 static inline bool classof(const Type *T) {
365 return T->getTypeID() == ArrayTyID;
369 /// VectorType - Class to represent vector types
371 class VectorType : public SequentialType {
372 friend class TypeMap<VectorValType, VectorType>;
373 unsigned NumElements;
375 VectorType(const VectorType &); // Do not implement
376 const VectorType &operator=(const VectorType &); // Do not implement
377 VectorType(const Type *ElType, unsigned NumEl);
379 /// VectorType::get - This static method is the primary way to construct an
382 static VectorType *get(const Type *ElementType, unsigned NumElements);
384 /// @brief Return the number of elements in the Vector type.
385 inline unsigned getNumElements() const { return NumElements; }
387 /// @brief Return the number of bits in the Vector type.
388 inline unsigned getBitWidth() const {
389 return NumElements *getElementType()->getPrimitiveSizeInBits();
392 // Implement the AbstractTypeUser interface.
393 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
394 virtual void typeBecameConcrete(const DerivedType *AbsTy);
396 // Methods for support type inquiry through isa, cast, and dyn_cast:
397 static inline bool classof(const VectorType *T) { return true; }
398 static inline bool classof(const Type *T) {
399 return T->getTypeID() == VectorTyID;
404 /// PointerType - Class to represent pointers
406 class PointerType : public SequentialType {
407 friend class TypeMap<PointerValType, PointerType>;
408 PointerType(const PointerType &); // Do not implement
409 const PointerType &operator=(const PointerType &); // Do not implement
410 explicit PointerType(const Type *ElType);
412 /// PointerType::get - This is the only way to construct a new pointer type.
413 static PointerType *get(const Type *ElementType);
415 // Implement the AbstractTypeUser interface.
416 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
417 virtual void typeBecameConcrete(const DerivedType *AbsTy);
419 // Implement support type inquiry through isa, cast, and dyn_cast:
420 static inline bool classof(const PointerType *T) { return true; }
421 static inline bool classof(const Type *T) {
422 return T->getTypeID() == PointerTyID;
427 /// OpaqueType - Class to represent abstract types
429 class OpaqueType : public DerivedType {
430 OpaqueType(const OpaqueType &); // DO NOT IMPLEMENT
431 const OpaqueType &operator=(const OpaqueType &); // DO NOT IMPLEMENT
434 /// OpaqueType::get - Static factory method for the OpaqueType class...
436 static OpaqueType *get() {
437 return new OpaqueType(); // All opaque types are distinct
440 // Implement the AbstractTypeUser interface.
441 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
442 abort(); // FIXME: this is not really an AbstractTypeUser!
444 virtual void typeBecameConcrete(const DerivedType *AbsTy) {
445 abort(); // FIXME: this is not really an AbstractTypeUser!
448 // Implement support for type inquiry through isa, cast, and dyn_cast:
449 static inline bool classof(const OpaqueType *T) { return true; }
450 static inline bool classof(const Type *T) {
451 return T->getTypeID() == OpaqueTyID;
455 } // End llvm namespace