1 //===-- llvm/DerivedTypes.h - Classes for handling data types ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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 // "function 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/ArrayRef.h"
23 #include "llvm/Support/DataTypes.h"
28 template<class ValType, class TypeClass> class TypeMap;
29 class FunctionValType;
38 class DerivedType : public Type {
42 explicit DerivedType(LLVMContext &C, TypeID id) : Type(C, id) {}
44 /// notifyUsesThatTypeBecameConcrete - Notify AbstractTypeUsers of this type
45 /// that the current type has transitioned from being abstract to being
48 void notifyUsesThatTypeBecameConcrete();
50 /// dropAllTypeUses - When this (abstract) type is resolved to be equal to
51 /// another (more concrete) type, we must eliminate all references to other
52 /// types, to avoid some circular reference problems.
54 void dropAllTypeUses();
58 //===--------------------------------------------------------------------===//
59 // Abstract Type handling methods - These types have special lifetimes, which
60 // are managed by (add|remove)AbstractTypeUser. See comments in
61 // AbstractTypeUser.h for more information.
63 /// refineAbstractTypeTo - This function is used to when it is discovered that
64 /// the 'this' abstract type is actually equivalent to the NewType specified.
65 /// This causes all users of 'this' to switch to reference the more concrete
66 /// type NewType and for 'this' to be deleted.
68 void refineAbstractTypeTo(const Type *NewType);
70 void dump() const { Type::dump(); }
72 // Methods for support type inquiry through isa, cast, and dyn_cast:
73 static inline bool classof(const DerivedType *) { return true; }
74 static inline bool classof(const Type *T) {
75 return T->isDerivedType();
79 /// Class to represent integer types. Note that this class is also used to
80 /// represent the built-in integer types: Int1Ty, Int8Ty, Int16Ty, Int32Ty and
82 /// @brief Integer representation type
83 class IntegerType : public DerivedType {
84 friend class LLVMContextImpl;
87 explicit IntegerType(LLVMContext &C, unsigned NumBits) :
88 DerivedType(C, IntegerTyID) {
89 setSubclassData(NumBits);
91 friend class TypeMap<IntegerValType, IntegerType>;
93 /// This enum is just used to hold constants we need for IntegerType.
95 MIN_INT_BITS = 1, ///< Minimum number of bits that can be specified
96 MAX_INT_BITS = (1<<23)-1 ///< Maximum number of bits that can be specified
97 ///< Note that bit width is stored in the Type classes SubclassData field
98 ///< which has 23 bits. This yields a maximum bit width of 8,388,607 bits.
101 /// This static method is the primary way of constructing an IntegerType.
102 /// If an IntegerType with the same NumBits value was previously instantiated,
103 /// that instance will be returned. Otherwise a new one will be created. Only
104 /// one instance with a given NumBits value is ever created.
105 /// @brief Get or create an IntegerType instance.
106 static const IntegerType* get(LLVMContext &C, unsigned NumBits);
108 /// @brief Get the number of bits in this IntegerType
109 unsigned getBitWidth() const { return getSubclassData(); }
111 /// getBitMask - Return a bitmask with ones set for all of the bits
112 /// that can be set by an unsigned version of this type. This is 0xFF for
113 /// i8, 0xFFFF for i16, etc.
114 uint64_t getBitMask() const {
115 return ~uint64_t(0UL) >> (64-getBitWidth());
118 /// getSignBit - Return a uint64_t with just the most significant bit set (the
119 /// sign bit, if the value is treated as a signed number).
120 uint64_t getSignBit() const {
121 return 1ULL << (getBitWidth()-1);
124 /// For example, this is 0xFF for an 8 bit integer, 0xFFFF for i16, etc.
125 /// @returns a bit mask with ones set for all the bits of this type.
126 /// @brief Get a bit mask for this type.
127 APInt getMask() const;
129 /// This method determines if the width of this IntegerType is a power-of-2
130 /// in terms of 8 bit bytes.
131 /// @returns true if this is a power-of-2 byte width.
132 /// @brief Is this a power-of-2 byte-width IntegerType ?
133 bool isPowerOf2ByteWidth() const;
135 // Methods for support type inquiry through isa, cast, and dyn_cast:
136 static inline bool classof(const IntegerType *) { return true; }
137 static inline bool classof(const Type *T) {
138 return T->getTypeID() == IntegerTyID;
143 /// FunctionType - Class to represent function types
145 class FunctionType : public DerivedType {
146 friend class TypeMap<FunctionValType, FunctionType>;
149 FunctionType(const FunctionType &); // Do not implement
150 const FunctionType &operator=(const FunctionType &); // Do not implement
151 FunctionType(const Type *Result, ArrayRef<const Type*> Params,
155 /// FunctionType::get - This static method is the primary way of constructing
158 static FunctionType *get(
159 const Type *Result, ///< The result type
160 ArrayRef<const Type*> Params, ///< The types of the parameters
161 bool isVarArg ///< Whether this is a variable argument length function
164 /// FunctionType::get - Create a FunctionType taking no parameters.
166 static FunctionType *get(
167 const Type *Result, ///< The result type
168 bool isVarArg ///< Whether this is a variable argument length function
170 return get(Result, ArrayRef<const Type *>(), isVarArg);
173 /// isValidReturnType - Return true if the specified type is valid as a return
175 static bool isValidReturnType(const Type *RetTy);
177 /// isValidArgumentType - Return true if the specified type is valid as an
179 static bool isValidArgumentType(const Type *ArgTy);
181 inline bool isVarArg() const { return isVarArgs; }
182 inline const Type *getReturnType() const { return ContainedTys[0]; }
184 typedef Type::subtype_iterator param_iterator;
185 param_iterator param_begin() const { return ContainedTys + 1; }
186 param_iterator param_end() const { return &ContainedTys[NumContainedTys]; }
188 // Parameter type accessors...
189 const Type *getParamType(unsigned i) const { return ContainedTys[i+1]; }
191 /// getNumParams - Return the number of fixed parameters this function type
192 /// requires. This does not consider varargs.
194 unsigned getNumParams() const { return NumContainedTys - 1; }
196 // Implement the AbstractTypeUser interface.
197 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
198 virtual void typeBecameConcrete(const DerivedType *AbsTy);
200 // Methods for support type inquiry through isa, cast, and dyn_cast:
201 static inline bool classof(const FunctionType *) { return true; }
202 static inline bool classof(const Type *T) {
203 return T->getTypeID() == FunctionTyID;
208 /// CompositeType - Common super class of ArrayType, StructType, PointerType
210 class CompositeType : public DerivedType {
212 inline explicit CompositeType(LLVMContext &C, TypeID id) :
213 DerivedType(C, id) { }
216 /// getTypeAtIndex - Given an index value into the type, return the type of
219 virtual const Type *getTypeAtIndex(const Value *V) const = 0;
220 virtual const Type *getTypeAtIndex(unsigned Idx) const = 0;
221 virtual bool indexValid(const Value *V) const = 0;
222 virtual bool indexValid(unsigned Idx) const = 0;
224 // Methods for support type inquiry through isa, cast, and dyn_cast:
225 static inline bool classof(const CompositeType *) { return true; }
226 static inline bool classof(const Type *T) {
227 return T->getTypeID() == ArrayTyID ||
228 T->getTypeID() == StructTyID ||
229 T->getTypeID() == PointerTyID ||
230 T->getTypeID() == VectorTyID;
235 /// StructType - Class to represent struct types
237 class StructType : public CompositeType {
238 friend class TypeMap<StructValType, StructType>;
239 StructType(const StructType &); // Do not implement
240 const StructType &operator=(const StructType &); // Do not implement
241 StructType(LLVMContext &C, ArrayRef<const Type*> Types, bool isPacked);
243 /// StructType::get - This static method is the primary way to create a
246 static StructType *get(LLVMContext &Context,
247 ArrayRef<const Type*> Params,
248 bool isPacked=false);
250 /// StructType::get - Create an empty structure type.
252 static StructType *get(LLVMContext &Context, bool isPacked=false) {
253 return get(Context, llvm::ArrayRef<const Type*>(), isPacked);
256 /// StructType::get - This static method is a convenience method for
257 /// creating structure types by specifying the elements as arguments.
258 /// Note that this method always returns a non-packed struct. To get
259 /// an empty struct, pass NULL, NULL.
260 static StructType *get(LLVMContext &Context,
261 const Type *type, ...) END_WITH_NULL;
263 /// isValidElementType - Return true if the specified type is valid as a
265 static bool isValidElementType(const Type *ElemTy);
267 // Iterator access to the elements
268 typedef Type::subtype_iterator element_iterator;
269 element_iterator element_begin() const { return ContainedTys; }
270 element_iterator element_end() const { return &ContainedTys[NumContainedTys];}
272 // Random access to the elements
273 unsigned getNumElements() const { return NumContainedTys; }
274 const Type *getElementType(unsigned N) const {
275 assert(N < NumContainedTys && "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 const Type *getTypeAtIndex(unsigned Idx) const;
284 virtual bool indexValid(const Value *V) const;
285 virtual bool indexValid(unsigned Idx) const;
287 // Implement the AbstractTypeUser interface.
288 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
289 virtual void typeBecameConcrete(const DerivedType *AbsTy);
291 // Methods for support type inquiry through isa, cast, and dyn_cast:
292 static inline bool classof(const StructType *) { return true; }
293 static inline bool classof(const Type *T) {
294 return T->getTypeID() == StructTyID;
297 bool isPacked() const { return (0 != getSubclassData()) ? true : false; }
300 /// SequentialType - This is the superclass of the array, pointer and vector
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 // avoiding warning: 'this' : used in base member initializer list
314 SequentialType* this_() { return this; }
316 SequentialType(TypeID TID, const Type *ElType)
317 : CompositeType(ElType->getContext(), TID), ContainedType(ElType, this_()) {
318 ContainedTys = &ContainedType;
323 inline const Type *getElementType() const { return ContainedTys[0]; }
325 virtual bool indexValid(const Value *V) const;
326 virtual bool indexValid(unsigned) const {
330 /// getTypeAtIndex - Given an index value into the type, return the type of
331 /// the element. For sequential types, there is only one subtype...
333 virtual const Type *getTypeAtIndex(const Value *) const {
334 return ContainedTys[0];
336 virtual const Type *getTypeAtIndex(unsigned) const {
337 return ContainedTys[0];
340 // Methods for support type inquiry through isa, cast, and dyn_cast:
341 static inline bool classof(const SequentialType *) { return true; }
342 static inline bool classof(const Type *T) {
343 return T->getTypeID() == ArrayTyID ||
344 T->getTypeID() == PointerTyID ||
345 T->getTypeID() == VectorTyID;
350 /// ArrayType - Class to represent array types
352 class ArrayType : public SequentialType {
353 friend class TypeMap<ArrayValType, ArrayType>;
354 uint64_t NumElements;
356 ArrayType(const ArrayType &); // Do not implement
357 const ArrayType &operator=(const ArrayType &); // Do not implement
358 ArrayType(const Type *ElType, uint64_t NumEl);
360 /// ArrayType::get - This static method is the primary way to construct an
363 static ArrayType *get(const Type *ElementType, uint64_t NumElements);
365 /// isValidElementType - Return true if the specified type is valid as a
367 static bool isValidElementType(const Type *ElemTy);
369 inline uint64_t getNumElements() const { return NumElements; }
371 // Implement the AbstractTypeUser interface.
372 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
373 virtual void typeBecameConcrete(const DerivedType *AbsTy);
375 // Methods for support type inquiry through isa, cast, and dyn_cast:
376 static inline bool classof(const ArrayType *) { return true; }
377 static inline bool classof(const Type *T) {
378 return T->getTypeID() == ArrayTyID;
382 /// VectorType - Class to represent vector types
384 class VectorType : public SequentialType {
385 friend class TypeMap<VectorValType, VectorType>;
386 unsigned NumElements;
388 VectorType(const VectorType &); // Do not implement
389 const VectorType &operator=(const VectorType &); // Do not implement
390 VectorType(const Type *ElType, unsigned NumEl);
392 /// VectorType::get - This static method is the primary way to construct an
395 static VectorType *get(const Type *ElementType, unsigned NumElements);
397 /// VectorType::getInteger - This static method gets a VectorType with the
398 /// same number of elements as the input type, and the element type is an
399 /// integer type of the same width as the input element type.
401 static VectorType *getInteger(const VectorType *VTy) {
402 unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
403 const Type *EltTy = IntegerType::get(VTy->getContext(), EltBits);
404 return VectorType::get(EltTy, VTy->getNumElements());
407 /// VectorType::getExtendedElementVectorType - This static method is like
408 /// getInteger except that the element types are twice as wide as the
409 /// elements in the input type.
411 static VectorType *getExtendedElementVectorType(const VectorType *VTy) {
412 unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
413 const Type *EltTy = IntegerType::get(VTy->getContext(), EltBits * 2);
414 return VectorType::get(EltTy, VTy->getNumElements());
417 /// VectorType::getTruncatedElementVectorType - This static method is like
418 /// getInteger except that the element types are half as wide as the
419 /// elements in the input type.
421 static VectorType *getTruncatedElementVectorType(const VectorType *VTy) {
422 unsigned EltBits = VTy->getElementType()->getPrimitiveSizeInBits();
423 assert((EltBits & 1) == 0 &&
424 "Cannot truncate vector element with odd bit-width");
425 const Type *EltTy = IntegerType::get(VTy->getContext(), EltBits / 2);
426 return VectorType::get(EltTy, VTy->getNumElements());
429 /// isValidElementType - Return true if the specified type is valid as a
431 static bool isValidElementType(const Type *ElemTy);
433 /// @brief Return the number of elements in the Vector type.
434 inline unsigned getNumElements() const { return NumElements; }
436 /// @brief Return the number of bits in the Vector type.
437 inline unsigned getBitWidth() const {
438 return NumElements * getElementType()->getPrimitiveSizeInBits();
441 // Implement the AbstractTypeUser interface.
442 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
443 virtual void typeBecameConcrete(const DerivedType *AbsTy);
445 // Methods for support type inquiry through isa, cast, and dyn_cast:
446 static inline bool classof(const VectorType *) { return true; }
447 static inline bool classof(const Type *T) {
448 return T->getTypeID() == VectorTyID;
453 /// PointerType - Class to represent pointers
455 class PointerType : public SequentialType {
456 friend class TypeMap<PointerValType, PointerType>;
457 unsigned AddressSpace;
459 PointerType(const PointerType &); // Do not implement
460 const PointerType &operator=(const PointerType &); // Do not implement
461 explicit PointerType(const Type *ElType, unsigned AddrSpace);
463 /// PointerType::get - This constructs a pointer to an object of the specified
464 /// type in a numbered address space.
465 static PointerType *get(const Type *ElementType, unsigned AddressSpace);
467 /// PointerType::getUnqual - This constructs a pointer to an object of the
468 /// specified type in the generic address space (address space zero).
469 static PointerType *getUnqual(const Type *ElementType) {
470 return PointerType::get(ElementType, 0);
473 /// isValidElementType - Return true if the specified type is valid as a
475 static bool isValidElementType(const Type *ElemTy);
477 /// @brief Return the address space of the Pointer type.
478 inline unsigned getAddressSpace() const { return AddressSpace; }
480 // Implement the AbstractTypeUser interface.
481 virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
482 virtual void typeBecameConcrete(const DerivedType *AbsTy);
484 // Implement support type inquiry through isa, cast, and dyn_cast:
485 static inline bool classof(const PointerType *) { return true; }
486 static inline bool classof(const Type *T) {
487 return T->getTypeID() == PointerTyID;
492 /// OpaqueType - Class to represent abstract types
494 class OpaqueType : public DerivedType {
495 friend class LLVMContextImpl;
496 OpaqueType(const OpaqueType &); // DO NOT IMPLEMENT
497 const OpaqueType &operator=(const OpaqueType &); // DO NOT IMPLEMENT
498 OpaqueType(LLVMContext &C);
500 /// OpaqueType::get - Static factory method for the OpaqueType class...
502 static OpaqueType *get(LLVMContext &C);
504 // Implement support for type inquiry through isa, cast, and dyn_cast:
505 static inline bool classof(const OpaqueType *) { return true; }
506 static inline bool classof(const Type *T) {
507 return T->getTypeID() == OpaqueTyID;
511 } // End llvm namespace