1 //===- llvm/Type.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 declaration of the Type class. For more "Type"
11 // stuff, look in DerivedTypes.h.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_IR_TYPE_H
16 #define LLVM_IR_TYPE_H
18 #include "llvm/ADT/APFloat.h"
19 #include "llvm/ADT/ArrayRef.h"
20 #include "llvm/ADT/SmallPtrSet.h"
21 #include "llvm/Support/Casting.h"
22 #include "llvm/Support/CBindingWrapping.h"
23 #include "llvm/Support/Compiler.h"
24 #include "llvm/Support/ErrorHandling.h"
31 template<class GraphType> struct GraphTraits;
38 /// The instances of the Type class are immutable: once they are created,
39 /// they are never changed. Also note that only one instance of a particular
40 /// type is ever created. Thus seeing if two types are equal is a matter of
41 /// doing a trivial pointer comparison. To enforce that no two equal instances
42 /// are created, Type instances can only be created via static factory methods
43 /// in class Type and in derived classes. Once allocated, Types are never
48 //===--------------------------------------------------------------------===//
49 /// Definitions of all of the base types for the Type system. Based on this
50 /// value, you can cast to a class defined in DerivedTypes.h.
51 /// Note: If you add an element to this, you need to add an element to the
52 /// Type::getPrimitiveType function, or else things will break!
53 /// Also update LLVMTypeKind and LLVMGetTypeKind () in the C binding.
56 // PrimitiveTypes - make sure LastPrimitiveTyID stays up to date.
57 VoidTyID = 0, ///< 0: type with no size
58 HalfTyID, ///< 1: 16-bit floating point type
59 FloatTyID, ///< 2: 32-bit floating point type
60 DoubleTyID, ///< 3: 64-bit floating point type
61 X86_FP80TyID, ///< 4: 80-bit floating point type (X87)
62 FP128TyID, ///< 5: 128-bit floating point type (112-bit mantissa)
63 PPC_FP128TyID, ///< 6: 128-bit floating point type (two 64-bits, PowerPC)
64 LabelTyID, ///< 7: Labels
65 MetadataTyID, ///< 8: Metadata
66 X86_MMXTyID, ///< 9: MMX vectors (64 bits, X86 specific)
67 TokenTyID, ///< 10: Tokens
69 // Derived types... see DerivedTypes.h file.
70 // Make sure FirstDerivedTyID stays up to date!
71 IntegerTyID, ///< 11: Arbitrary bit width integers
72 FunctionTyID, ///< 12: Functions
73 StructTyID, ///< 13: Structures
74 ArrayTyID, ///< 14: Arrays
75 PointerTyID, ///< 15: Pointers
76 VectorTyID ///< 16: SIMD 'packed' format, or other vector type
80 /// This refers to the LLVMContext in which this type was uniqued.
83 TypeID ID : 8; // The current base type of this type.
84 unsigned SubclassData : 24; // Space for subclasses to store data.
85 // Note that this should be synchronized with
86 // MAX_INT_BITS value in IntegerType class.
89 friend class LLVMContextImpl;
91 explicit Type(LLVMContext &C, TypeID tid)
92 : Context(C), ID(tid), SubclassData(0) {}
95 unsigned getSubclassData() const { return SubclassData; }
97 void setSubclassData(unsigned val) {
99 // Ensure we don't have any accidental truncation.
100 assert(getSubclassData() == val && "Subclass data too large for field");
103 /// Keeps track of how many Type*'s there are in the ContainedTys list.
104 unsigned NumContainedTys = 0;
106 /// A pointer to the array of Types contained by this Type. For example, this
107 /// includes the arguments of a function type, the elements of a structure,
108 /// the pointee of a pointer, the element type of an array, etc. This pointer
109 /// may be 0 for types that don't contain other types (Integer, Double,
111 Type * const *ContainedTys = nullptr;
113 static bool isSequentialType(TypeID TyID) {
114 return TyID == ArrayTyID || TyID == VectorTyID;
118 /// Print the current type.
119 /// Omit the type details if \p NoDetails == true.
120 /// E.g., let %st = type { i32, i16 }
121 /// When \p NoDetails is true, we only print %st.
122 /// Put differently, \p NoDetails prints the type as if
123 /// inlined with the operands when printing an instruction.
124 void print(raw_ostream &O, bool IsForDebug = false,
125 bool NoDetails = false) const;
129 /// Return the LLVMContext in which this type was uniqued.
130 LLVMContext &getContext() const { return Context; }
132 //===--------------------------------------------------------------------===//
133 // Accessors for working with types.
136 /// Return the type id for the type. This will return one of the TypeID enum
137 /// elements defined above.
138 TypeID getTypeID() const { return ID; }
140 /// Return true if this is 'void'.
141 bool isVoidTy() const { return getTypeID() == VoidTyID; }
143 /// Return true if this is 'half', a 16-bit IEEE fp type.
144 bool isHalfTy() const { return getTypeID() == HalfTyID; }
146 /// Return true if this is 'float', a 32-bit IEEE fp type.
147 bool isFloatTy() const { return getTypeID() == FloatTyID; }
149 /// Return true if this is 'double', a 64-bit IEEE fp type.
150 bool isDoubleTy() const { return getTypeID() == DoubleTyID; }
152 /// Return true if this is x86 long double.
153 bool isX86_FP80Ty() const { return getTypeID() == X86_FP80TyID; }
155 /// Return true if this is 'fp128'.
156 bool isFP128Ty() const { return getTypeID() == FP128TyID; }
158 /// Return true if this is powerpc long double.
159 bool isPPC_FP128Ty() const { return getTypeID() == PPC_FP128TyID; }
161 /// Return true if this is one of the six floating-point types
162 bool isFloatingPointTy() const {
163 return getTypeID() == HalfTyID || getTypeID() == FloatTyID ||
164 getTypeID() == DoubleTyID ||
165 getTypeID() == X86_FP80TyID || getTypeID() == FP128TyID ||
166 getTypeID() == PPC_FP128TyID;
169 const fltSemantics &getFltSemantics() const {
170 switch (getTypeID()) {
171 case HalfTyID: return APFloat::IEEEhalf();
172 case FloatTyID: return APFloat::IEEEsingle();
173 case DoubleTyID: return APFloat::IEEEdouble();
174 case X86_FP80TyID: return APFloat::x87DoubleExtended();
175 case FP128TyID: return APFloat::IEEEquad();
176 case PPC_FP128TyID: return APFloat::PPCDoubleDouble();
177 default: llvm_unreachable("Invalid floating type");
181 /// Return true if this is X86 MMX.
182 bool isX86_MMXTy() const { return getTypeID() == X86_MMXTyID; }
184 /// Return true if this is a FP type or a vector of FP.
185 bool isFPOrFPVectorTy() const { return getScalarType()->isFloatingPointTy(); }
187 /// Return true if this is 'label'.
188 bool isLabelTy() const { return getTypeID() == LabelTyID; }
190 /// Return true if this is 'metadata'.
191 bool isMetadataTy() const { return getTypeID() == MetadataTyID; }
193 /// Return true if this is 'token'.
194 bool isTokenTy() const { return getTypeID() == TokenTyID; }
196 /// True if this is an instance of IntegerType.
197 bool isIntegerTy() const { return getTypeID() == IntegerTyID; }
199 /// Return true if this is an IntegerType of the given width.
200 bool isIntegerTy(unsigned Bitwidth) const;
202 /// Return true if this is an integer type or a vector of integer types.
203 bool isIntOrIntVectorTy() const { return getScalarType()->isIntegerTy(); }
205 /// True if this is an instance of FunctionType.
206 bool isFunctionTy() const { return getTypeID() == FunctionTyID; }
208 /// True if this is an instance of StructType.
209 bool isStructTy() const { return getTypeID() == StructTyID; }
211 /// True if this is an instance of ArrayType.
212 bool isArrayTy() const { return getTypeID() == ArrayTyID; }
214 /// True if this is an instance of PointerType.
215 bool isPointerTy() const { return getTypeID() == PointerTyID; }
217 /// Return true if this is a pointer type or a vector of pointer types.
218 bool isPtrOrPtrVectorTy() const { return getScalarType()->isPointerTy(); }
220 /// True if this is an instance of VectorType.
221 bool isVectorTy() const { return getTypeID() == VectorTyID; }
223 /// Return true if this type could be converted with a lossless BitCast to
224 /// type 'Ty'. For example, i8* to i32*. BitCasts are valid for types of the
225 /// same size only where no re-interpretation of the bits is done.
226 /// @brief Determine if this type could be losslessly bitcast to Ty
227 bool canLosslesslyBitCastTo(Type *Ty) const;
229 /// Return true if this type is empty, that is, it has no elements or all of
230 /// its elements are empty.
231 bool isEmptyTy() const;
233 /// Return true if the type is "first class", meaning it is a valid type for a
235 bool isFirstClassType() const {
236 return getTypeID() != FunctionTyID && getTypeID() != VoidTyID;
239 /// Return true if the type is a valid type for a register in codegen. This
240 /// includes all first-class types except struct and array types.
241 bool isSingleValueType() const {
242 return isFloatingPointTy() || isX86_MMXTy() || isIntegerTy() ||
243 isPointerTy() || isVectorTy();
246 /// Return true if the type is an aggregate type. This means it is valid as
247 /// the first operand of an insertvalue or extractvalue instruction. This
248 /// includes struct and array types, but does not include vector types.
249 bool isAggregateType() const {
250 return getTypeID() == StructTyID || getTypeID() == ArrayTyID;
253 /// Return true if it makes sense to take the size of this type. To get the
254 /// actual size for a particular target, it is reasonable to use the
255 /// DataLayout subsystem to do this.
256 bool isSized(SmallPtrSetImpl<Type*> *Visited = nullptr) const {
257 // If it's a primitive, it is always sized.
258 if (getTypeID() == IntegerTyID || isFloatingPointTy() ||
259 getTypeID() == PointerTyID ||
260 getTypeID() == X86_MMXTyID)
262 // If it is not something that can have a size (e.g. a function or label),
263 // it doesn't have a size.
264 if (getTypeID() != StructTyID && getTypeID() != ArrayTyID &&
265 getTypeID() != VectorTyID)
267 // Otherwise we have to try harder to decide.
268 return isSizedDerivedType(Visited);
271 /// Return the basic size of this type if it is a primitive type. These are
272 /// fixed by LLVM and are not target-dependent.
273 /// This will return zero if the type does not have a size or is not a
276 /// Note that this may not reflect the size of memory allocated for an
277 /// instance of the type or the number of bytes that are written when an
278 /// instance of the type is stored to memory. The DataLayout class provides
279 /// additional query functions to provide this information.
281 unsigned getPrimitiveSizeInBits() const LLVM_READONLY;
283 /// If this is a vector type, return the getPrimitiveSizeInBits value for the
284 /// element type. Otherwise return the getPrimitiveSizeInBits value for this
286 unsigned getScalarSizeInBits() const LLVM_READONLY;
288 /// Return the width of the mantissa of this type. This is only valid on
289 /// floating-point types. If the FP type does not have a stable mantissa (e.g.
290 /// ppc long double), this method returns -1.
291 int getFPMantissaWidth() const;
293 /// If this is a vector type, return the element type, otherwise return
295 Type *getScalarType() const {
297 return getVectorElementType();
298 return const_cast<Type*>(this);
301 //===--------------------------------------------------------------------===//
302 // Type Iteration support.
304 using subtype_iterator = Type * const *;
306 subtype_iterator subtype_begin() const { return ContainedTys; }
307 subtype_iterator subtype_end() const { return &ContainedTys[NumContainedTys];}
308 ArrayRef<Type*> subtypes() const {
309 return makeArrayRef(subtype_begin(), subtype_end());
312 using subtype_reverse_iterator = std::reverse_iterator<subtype_iterator>;
314 subtype_reverse_iterator subtype_rbegin() const {
315 return subtype_reverse_iterator(subtype_end());
317 subtype_reverse_iterator subtype_rend() const {
318 return subtype_reverse_iterator(subtype_begin());
321 /// This method is used to implement the type iterator (defined at the end of
322 /// the file). For derived types, this returns the types 'contained' in the
324 Type *getContainedType(unsigned i) const {
325 assert(i < NumContainedTys && "Index out of range!");
326 return ContainedTys[i];
329 /// Return the number of types in the derived type.
330 unsigned getNumContainedTypes() const { return NumContainedTys; }
332 //===--------------------------------------------------------------------===//
333 // Helper methods corresponding to subclass methods. This forces a cast to
334 // the specified subclass and calls its accessor. "getVectorNumElements" (for
335 // example) is shorthand for cast<VectorType>(Ty)->getNumElements(). This is
336 // only intended to cover the core methods that are frequently used, helper
337 // methods should not be added here.
339 inline unsigned getIntegerBitWidth() const;
341 inline Type *getFunctionParamType(unsigned i) const;
342 inline unsigned getFunctionNumParams() const;
343 inline bool isFunctionVarArg() const;
345 inline StringRef getStructName() const;
346 inline unsigned getStructNumElements() const;
347 inline Type *getStructElementType(unsigned N) const;
349 inline Type *getSequentialElementType() const {
350 assert(isSequentialType(getTypeID()) && "Not a sequential type!");
351 return ContainedTys[0];
354 inline uint64_t getArrayNumElements() const;
356 Type *getArrayElementType() const {
357 assert(getTypeID() == ArrayTyID);
358 return ContainedTys[0];
361 inline unsigned getVectorNumElements() const;
362 Type *getVectorElementType() const {
363 assert(getTypeID() == VectorTyID);
364 return ContainedTys[0];
367 Type *getPointerElementType() const {
368 assert(getTypeID() == PointerTyID);
369 return ContainedTys[0];
372 /// Get the address space of this pointer or pointer vector type.
373 inline unsigned getPointerAddressSpace() const;
375 //===--------------------------------------------------------------------===//
376 // Static members exported by the Type class itself. Useful for getting
377 // instances of Type.
380 /// Return a type based on an identifier.
381 static Type *getPrimitiveType(LLVMContext &C, TypeID IDNumber);
383 //===--------------------------------------------------------------------===//
384 // These are the builtin types that are always available.
386 static Type *getVoidTy(LLVMContext &C);
387 static Type *getLabelTy(LLVMContext &C);
388 static Type *getHalfTy(LLVMContext &C);
389 static Type *getFloatTy(LLVMContext &C);
390 static Type *getDoubleTy(LLVMContext &C);
391 static Type *getMetadataTy(LLVMContext &C);
392 static Type *getX86_FP80Ty(LLVMContext &C);
393 static Type *getFP128Ty(LLVMContext &C);
394 static Type *getPPC_FP128Ty(LLVMContext &C);
395 static Type *getX86_MMXTy(LLVMContext &C);
396 static Type *getTokenTy(LLVMContext &C);
397 static IntegerType *getIntNTy(LLVMContext &C, unsigned N);
398 static IntegerType *getInt1Ty(LLVMContext &C);
399 static IntegerType *getInt8Ty(LLVMContext &C);
400 static IntegerType *getInt16Ty(LLVMContext &C);
401 static IntegerType *getInt32Ty(LLVMContext &C);
402 static IntegerType *getInt64Ty(LLVMContext &C);
403 static IntegerType *getInt128Ty(LLVMContext &C);
405 //===--------------------------------------------------------------------===//
406 // Convenience methods for getting pointer types with one of the above builtin
409 static PointerType *getHalfPtrTy(LLVMContext &C, unsigned AS = 0);
410 static PointerType *getFloatPtrTy(LLVMContext &C, unsigned AS = 0);
411 static PointerType *getDoublePtrTy(LLVMContext &C, unsigned AS = 0);
412 static PointerType *getX86_FP80PtrTy(LLVMContext &C, unsigned AS = 0);
413 static PointerType *getFP128PtrTy(LLVMContext &C, unsigned AS = 0);
414 static PointerType *getPPC_FP128PtrTy(LLVMContext &C, unsigned AS = 0);
415 static PointerType *getX86_MMXPtrTy(LLVMContext &C, unsigned AS = 0);
416 static PointerType *getIntNPtrTy(LLVMContext &C, unsigned N, unsigned AS = 0);
417 static PointerType *getInt1PtrTy(LLVMContext &C, unsigned AS = 0);
418 static PointerType *getInt8PtrTy(LLVMContext &C, unsigned AS = 0);
419 static PointerType *getInt16PtrTy(LLVMContext &C, unsigned AS = 0);
420 static PointerType *getInt32PtrTy(LLVMContext &C, unsigned AS = 0);
421 static PointerType *getInt64PtrTy(LLVMContext &C, unsigned AS = 0);
423 /// Return a pointer to the current type. This is equivalent to
424 /// PointerType::get(Foo, AddrSpace).
425 PointerType *getPointerTo(unsigned AddrSpace = 0) const;
428 /// Derived types like structures and arrays are sized iff all of the members
429 /// of the type are sized as well. Since asking for their size is relatively
430 /// uncommon, move this operation out-of-line.
431 bool isSizedDerivedType(SmallPtrSetImpl<Type*> *Visited = nullptr) const;
434 // Printing of types.
435 static inline raw_ostream &operator<<(raw_ostream &OS, const Type &T) {
440 // allow isa<PointerType>(x) to work without DerivedTypes.h included.
441 template <> struct isa_impl<PointerType, Type> {
442 static inline bool doit(const Type &Ty) {
443 return Ty.getTypeID() == Type::PointerTyID;
447 //===----------------------------------------------------------------------===//
448 // Provide specializations of GraphTraits to be able to treat a type as a
449 // graph of sub types.
451 template <> struct GraphTraits<Type *> {
452 using NodeRef = Type *;
453 using ChildIteratorType = Type::subtype_iterator;
455 static NodeRef getEntryNode(Type *T) { return T; }
456 static ChildIteratorType child_begin(NodeRef N) { return N->subtype_begin(); }
457 static ChildIteratorType child_end(NodeRef N) { return N->subtype_end(); }
460 template <> struct GraphTraits<const Type*> {
461 using NodeRef = const Type *;
462 using ChildIteratorType = Type::subtype_iterator;
464 static NodeRef getEntryNode(NodeRef T) { return T; }
465 static ChildIteratorType child_begin(NodeRef N) { return N->subtype_begin(); }
466 static ChildIteratorType child_end(NodeRef N) { return N->subtype_end(); }
469 // Create wrappers for C Binding types (see CBindingWrapping.h).
470 DEFINE_ISA_CONVERSION_FUNCTIONS(Type, LLVMTypeRef)
472 /* Specialized opaque type conversions.
474 inline Type **unwrap(LLVMTypeRef* Tys) {
475 return reinterpret_cast<Type**>(Tys);
478 inline LLVMTypeRef *wrap(Type **Tys) {
479 return reinterpret_cast<LLVMTypeRef*>(const_cast<Type**>(Tys));
482 } // end namespace llvm
484 #endif // LLVM_IR_TYPE_H