1 //===-- llvm/Constants.h - Constant class subclass definitions --*- 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 //===----------------------------------------------------------------------===//
11 /// This file contains the declarations for the subclasses of Constant,
12 /// which represent the different flavors of constant values that live in LLVM.
13 /// Note that Constants are immutable (once created they never change) and are
14 /// fully shared by structural equivalence. This means that two structurally
15 /// equivalent constants will always have the same address. Constant's are
16 /// created on demand as needed and never deleted: thus clients don't have to
17 /// worry about the lifetime of the objects.
19 //===----------------------------------------------------------------------===//
21 #ifndef LLVM_CONSTANTS_H
22 #define LLVM_CONSTANTS_H
24 #include "llvm/Constant.h"
25 #include "llvm/OperandTraits.h"
26 #include "llvm/ADT/APInt.h"
27 #include "llvm/ADT/APFloat.h"
28 #include "llvm/ADT/ArrayRef.h"
39 template<class ConstantClass, class TypeClass, class ValType>
40 struct ConstantCreator;
41 template<class ConstantClass, class TypeClass>
42 struct ConvertConstantType;
44 //===----------------------------------------------------------------------===//
45 /// This is the shared class of boolean and integer constants. This class
46 /// represents both boolean and integral constants.
47 /// @brief Class for constant integers.
48 class ConstantInt : public Constant {
49 virtual void anchor();
50 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
51 ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
52 ConstantInt(IntegerType *Ty, const APInt& V);
55 // allocate space for exactly zero operands
56 void *operator new(size_t s) {
57 return User::operator new(s, 0);
60 static ConstantInt *getTrue(LLVMContext &Context);
61 static ConstantInt *getFalse(LLVMContext &Context);
62 static Constant *getTrue(Type *Ty);
63 static Constant *getFalse(Type *Ty);
65 /// If Ty is a vector type, return a Constant with a splat of the given
66 /// value. Otherwise return a ConstantInt for the given value.
67 static Constant *get(Type *Ty, uint64_t V, bool isSigned = false);
69 /// Return a ConstantInt with the specified integer value for the specified
70 /// type. If the type is wider than 64 bits, the value will be zero-extended
71 /// to fit the type, unless isSigned is true, in which case the value will
72 /// be interpreted as a 64-bit signed integer and sign-extended to fit
74 /// @brief Get a ConstantInt for a specific value.
75 static ConstantInt *get(IntegerType *Ty, uint64_t V,
76 bool isSigned = false);
78 /// Return a ConstantInt with the specified value for the specified type. The
79 /// value V will be canonicalized to a an unsigned APInt. Accessing it with
80 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
81 /// signed value for the type Ty.
82 /// @brief Get a ConstantInt for a specific signed value.
83 static ConstantInt *getSigned(IntegerType *Ty, int64_t V);
84 static Constant *getSigned(Type *Ty, int64_t V);
86 /// Return a ConstantInt with the specified value and an implied Type. The
87 /// type is the integer type that corresponds to the bit width of the value.
88 static ConstantInt *get(LLVMContext &Context, const APInt &V);
90 /// Return a ConstantInt constructed from the string strStart with the given
92 static ConstantInt *get(IntegerType *Ty, StringRef Str,
95 /// If Ty is a vector type, return a Constant with a splat of the given
96 /// value. Otherwise return a ConstantInt for the given value.
97 static Constant *get(Type* Ty, const APInt& V);
99 /// Return the constant as an APInt value reference. This allows clients to
100 /// obtain a copy of the value, with all its precision in tact.
101 /// @brief Return the constant's value.
102 inline const APInt &getValue() const {
106 /// getBitWidth - Return the bitwidth of this constant.
107 unsigned getBitWidth() const { return Val.getBitWidth(); }
109 /// Return the constant as a 64-bit unsigned integer value after it
110 /// has been zero extended as appropriate for the type of this constant. Note
111 /// that this method can assert if the value does not fit in 64 bits.
113 /// @brief Return the zero extended value.
114 inline uint64_t getZExtValue() const {
115 return Val.getZExtValue();
118 /// Return the constant as a 64-bit integer value after it has been sign
119 /// extended as appropriate for the type of this constant. Note that
120 /// this method can assert if the value does not fit in 64 bits.
122 /// @brief Return the sign extended value.
123 inline int64_t getSExtValue() const {
124 return Val.getSExtValue();
127 /// A helper method that can be used to determine if the constant contained
128 /// within is equal to a constant. This only works for very small values,
129 /// because this is all that can be represented with all types.
130 /// @brief Determine if this constant's value is same as an unsigned char.
131 bool equalsInt(uint64_t V) const {
135 /// getType - Specialize the getType() method to always return an IntegerType,
136 /// which reduces the amount of casting needed in parts of the compiler.
138 inline IntegerType *getType() const {
139 return reinterpret_cast<IntegerType*>(Value::getType());
142 /// This static method returns true if the type Ty is big enough to
143 /// represent the value V. This can be used to avoid having the get method
144 /// assert when V is larger than Ty can represent. Note that there are two
145 /// versions of this method, one for unsigned and one for signed integers.
146 /// Although ConstantInt canonicalizes everything to an unsigned integer,
147 /// the signed version avoids callers having to convert a signed quantity
148 /// to the appropriate unsigned type before calling the method.
149 /// @returns true if V is a valid value for type Ty
150 /// @brief Determine if the value is in range for the given type.
151 static bool isValueValidForType(Type *Ty, uint64_t V);
152 static bool isValueValidForType(Type *Ty, int64_t V);
154 bool isNegative() const { return Val.isNegative(); }
156 /// This is just a convenience method to make client code smaller for a
157 /// common code. It also correctly performs the comparison without the
158 /// potential for an assertion from getZExtValue().
159 bool isZero() const {
163 /// This is just a convenience method to make client code smaller for a
164 /// common case. It also correctly performs the comparison without the
165 /// potential for an assertion from getZExtValue().
166 /// @brief Determine if the value is one.
171 /// This function will return true iff every bit in this constant is set
173 /// @returns true iff this constant's bits are all set to true.
174 /// @brief Determine if the value is all ones.
175 bool isMinusOne() const {
176 return Val.isAllOnesValue();
179 /// This function will return true iff this constant represents the largest
180 /// value that may be represented by the constant's type.
181 /// @returns true iff this is the largest value that may be represented
183 /// @brief Determine if the value is maximal.
184 bool isMaxValue(bool isSigned) const {
186 return Val.isMaxSignedValue();
188 return Val.isMaxValue();
191 /// This function will return true iff this constant represents the smallest
192 /// value that may be represented by this constant's type.
193 /// @returns true if this is the smallest value that may be represented by
195 /// @brief Determine if the value is minimal.
196 bool isMinValue(bool isSigned) const {
198 return Val.isMinSignedValue();
200 return Val.isMinValue();
203 /// This function will return true iff this constant represents a value with
204 /// active bits bigger than 64 bits or a value greater than the given uint64_t
206 /// @returns true iff this constant is greater or equal to the given number.
207 /// @brief Determine if the value is greater or equal to the given number.
208 bool uge(uint64_t Num) const {
209 return Val.getActiveBits() > 64 || Val.getZExtValue() >= Num;
212 /// getLimitedValue - If the value is smaller than the specified limit,
213 /// return it, otherwise return the limit value. This causes the value
214 /// to saturate to the limit.
215 /// @returns the min of the value of the constant and the specified value
216 /// @brief Get the constant's value with a saturation limit
217 uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
218 return Val.getLimitedValue(Limit);
221 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
222 static inline bool classof(const ConstantInt *) { return true; }
223 static bool classof(const Value *V) {
224 return V->getValueID() == ConstantIntVal;
229 //===----------------------------------------------------------------------===//
230 /// ConstantFP - Floating Point Values [float, double]
232 class ConstantFP : public Constant {
234 virtual void anchor();
235 void *operator new(size_t, unsigned);// DO NOT IMPLEMENT
236 ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
237 friend class LLVMContextImpl;
239 ConstantFP(Type *Ty, const APFloat& V);
241 // allocate space for exactly zero operands
242 void *operator new(size_t s) {
243 return User::operator new(s, 0);
246 /// Floating point negation must be implemented with f(x) = -0.0 - x. This
247 /// method returns the negative zero constant for floating point or vector
248 /// floating point types; for all other types, it returns the null value.
249 static Constant *getZeroValueForNegation(Type *Ty);
251 /// get() - This returns a ConstantFP, or a vector containing a splat of a
252 /// ConstantFP, for the specified value in the specified type. This should
253 /// only be used for simple constant values like 2.0/1.0 etc, that are
254 /// known-valid both as host double and as the target format.
255 static Constant *get(Type* Ty, double V);
256 static Constant *get(Type* Ty, StringRef Str);
257 static ConstantFP *get(LLVMContext &Context, const APFloat &V);
258 static ConstantFP *getNegativeZero(Type* Ty);
259 static ConstantFP *getInfinity(Type *Ty, bool Negative = false);
261 /// isValueValidForType - return true if Ty is big enough to represent V.
262 static bool isValueValidForType(Type *Ty, const APFloat &V);
263 inline const APFloat &getValueAPF() const { return Val; }
265 /// isZero - Return true if the value is positive or negative zero.
266 bool isZero() const { return Val.isZero(); }
268 /// isNegative - Return true if the sign bit is set.
269 bool isNegative() const { return Val.isNegative(); }
271 /// isNaN - Return true if the value is a NaN.
272 bool isNaN() const { return Val.isNaN(); }
274 /// isExactlyValue - We don't rely on operator== working on double values, as
275 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
276 /// As such, this method can be used to do an exact bit-for-bit comparison of
277 /// two floating point values. The version with a double operand is retained
278 /// because it's so convenient to write isExactlyValue(2.0), but please use
279 /// it only for simple constants.
280 bool isExactlyValue(const APFloat &V) const;
282 bool isExactlyValue(double V) const {
284 // convert is not supported on this type
285 if (&Val.getSemantics() == &APFloat::PPCDoubleDouble)
288 FV.convert(Val.getSemantics(), APFloat::rmNearestTiesToEven, &ignored);
289 return isExactlyValue(FV);
291 /// Methods for support type inquiry through isa, cast, and dyn_cast:
292 static inline bool classof(const ConstantFP *) { return true; }
293 static bool classof(const Value *V) {
294 return V->getValueID() == ConstantFPVal;
298 //===----------------------------------------------------------------------===//
299 /// ConstantAggregateZero - All zero aggregate value
301 class ConstantAggregateZero : public Constant {
302 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
303 ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
305 explicit ConstantAggregateZero(Type *ty)
306 : Constant(ty, ConstantAggregateZeroVal, 0, 0) {}
308 // allocate space for exactly zero operands
309 void *operator new(size_t s) {
310 return User::operator new(s, 0);
313 static ConstantAggregateZero *get(Type *Ty);
315 virtual void destroyConstant();
317 /// getSequentialElement - If this CAZ has array or vector type, return a zero
318 /// with the right element type.
319 Constant *getSequentialElement();
321 /// getStructElement - If this CAZ has struct type, return a zero with the
322 /// right element type for the specified element.
323 Constant *getStructElement(unsigned Elt);
325 /// getElementValue - Return a zero of the right value for the specified GEP
327 Constant *getElementValue(Constant *C);
329 /// getElementValue - Return a zero of the right value for the specified GEP
331 Constant *getElementValue(unsigned Idx);
333 /// Methods for support type inquiry through isa, cast, and dyn_cast:
335 static bool classof(const ConstantAggregateZero *) { return true; }
336 static bool classof(const Value *V) {
337 return V->getValueID() == ConstantAggregateZeroVal;
342 //===----------------------------------------------------------------------===//
343 /// ConstantArray - Constant Array Declarations
345 class ConstantArray : public Constant {
346 friend struct ConstantCreator<ConstantArray, ArrayType,
347 std::vector<Constant*> >;
348 ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
350 ConstantArray(ArrayType *T, ArrayRef<Constant *> Val);
352 // ConstantArray accessors
353 static Constant *get(ArrayType *T, ArrayRef<Constant*> V);
355 /// This method constructs a ConstantArray and initializes it with a text
356 /// string. The default behavior (AddNull==true) causes a null terminator to
357 /// be placed at the end of the array. This effectively increases the length
358 /// of the array by one (you've been warned). However, in some situations
359 /// this is not desired so if AddNull==false then the string is copied without
360 /// null termination.
361 static Constant *get(LLVMContext &Context, StringRef Initializer,
362 bool AddNull = true);
364 /// Transparently provide more efficient getOperand methods.
365 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
367 /// getType - Specialize the getType() method to always return an ArrayType,
368 /// which reduces the amount of casting needed in parts of the compiler.
370 inline ArrayType *getType() const {
371 return reinterpret_cast<ArrayType*>(Value::getType());
374 /// isString - This method returns true if the array is an array of i8 and
375 /// the elements of the array are all ConstantInt's.
376 bool isString() const;
378 /// isCString - This method returns true if the array is a string (see
380 /// isString) and it ends in a null byte \0 and does not contains any other
382 /// null bytes except its terminator.
383 bool isCString() const;
385 /// getAsString - If this array is isString(), then this method converts the
386 /// array to an std::string and returns it. Otherwise, it asserts out.
388 std::string getAsString() const;
390 /// getAsCString - If this array is isCString(), then this method converts the
391 /// array (without the trailing null byte) to an std::string and returns it.
392 /// Otherwise, it asserts out.
394 std::string getAsCString() const;
396 virtual void destroyConstant();
397 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
399 /// Methods for support type inquiry through isa, cast, and dyn_cast:
400 static inline bool classof(const ConstantArray *) { return true; }
401 static bool classof(const Value *V) {
402 return V->getValueID() == ConstantArrayVal;
407 struct OperandTraits<ConstantArray> :
408 public VariadicOperandTraits<ConstantArray> {
411 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantArray, Constant)
413 //===----------------------------------------------------------------------===//
414 // ConstantStruct - Constant Struct Declarations
416 class ConstantStruct : public Constant {
417 friend struct ConstantCreator<ConstantStruct, StructType,
418 std::vector<Constant*> >;
419 ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
421 ConstantStruct(StructType *T, ArrayRef<Constant *> Val);
423 // ConstantStruct accessors
424 static Constant *get(StructType *T, ArrayRef<Constant*> V);
425 static Constant *get(StructType *T, ...) END_WITH_NULL;
427 /// getAnon - Return an anonymous struct that has the specified
428 /// elements. If the struct is possibly empty, then you must specify a
430 static Constant *getAnon(ArrayRef<Constant*> V, bool Packed = false) {
431 return get(getTypeForElements(V, Packed), V);
433 static Constant *getAnon(LLVMContext &Ctx,
434 ArrayRef<Constant*> V, bool Packed = false) {
435 return get(getTypeForElements(Ctx, V, Packed), V);
438 /// getTypeForElements - Return an anonymous struct type to use for a constant
439 /// with the specified set of elements. The list must not be empty.
440 static StructType *getTypeForElements(ArrayRef<Constant*> V,
441 bool Packed = false);
442 /// getTypeForElements - This version of the method allows an empty list.
443 static StructType *getTypeForElements(LLVMContext &Ctx,
444 ArrayRef<Constant*> V,
445 bool Packed = false);
447 /// Transparently provide more efficient getOperand methods.
448 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
450 /// getType() specialization - Reduce amount of casting...
452 inline StructType *getType() const {
453 return reinterpret_cast<StructType*>(Value::getType());
456 virtual void destroyConstant();
457 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
459 /// Methods for support type inquiry through isa, cast, and dyn_cast:
460 static inline bool classof(const ConstantStruct *) { return true; }
461 static bool classof(const Value *V) {
462 return V->getValueID() == ConstantStructVal;
467 struct OperandTraits<ConstantStruct> :
468 public VariadicOperandTraits<ConstantStruct> {
471 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantStruct, Constant)
474 //===----------------------------------------------------------------------===//
475 /// ConstantVector - Constant Vector Declarations
477 class ConstantVector : public Constant {
478 friend struct ConstantCreator<ConstantVector, VectorType,
479 std::vector<Constant*> >;
480 ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
482 ConstantVector(VectorType *T, ArrayRef<Constant *> Val);
484 // ConstantVector accessors
485 static Constant *get(ArrayRef<Constant*> V);
487 /// Transparently provide more efficient getOperand methods.
488 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
490 /// getType - Specialize the getType() method to always return a VectorType,
491 /// which reduces the amount of casting needed in parts of the compiler.
493 inline VectorType *getType() const {
494 return reinterpret_cast<VectorType*>(Value::getType());
497 /// getSplatValue - If this is a splat constant, meaning that all of the
498 /// elements have the same value, return that value. Otherwise return NULL.
499 Constant *getSplatValue() const;
501 virtual void destroyConstant();
502 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
504 /// Methods for support type inquiry through isa, cast, and dyn_cast:
505 static inline bool classof(const ConstantVector *) { return true; }
506 static bool classof(const Value *V) {
507 return V->getValueID() == ConstantVectorVal;
512 struct OperandTraits<ConstantVector> :
513 public VariadicOperandTraits<ConstantVector> {
516 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantVector, Constant)
518 //===----------------------------------------------------------------------===//
519 /// ConstantPointerNull - a constant pointer value that points to null
521 class ConstantPointerNull : public Constant {
522 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
523 ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
525 explicit ConstantPointerNull(PointerType *T)
526 : Constant(reinterpret_cast<Type*>(T),
527 Value::ConstantPointerNullVal, 0, 0) {}
530 // allocate space for exactly zero operands
531 void *operator new(size_t s) {
532 return User::operator new(s, 0);
535 /// get() - Static factory methods - Return objects of the specified value
536 static ConstantPointerNull *get(PointerType *T);
538 virtual void destroyConstant();
540 /// getType - Specialize the getType() method to always return an PointerType,
541 /// which reduces the amount of casting needed in parts of the compiler.
543 inline PointerType *getType() const {
544 return reinterpret_cast<PointerType*>(Value::getType());
547 /// Methods for support type inquiry through isa, cast, and dyn_cast:
548 static inline bool classof(const ConstantPointerNull *) { return true; }
549 static bool classof(const Value *V) {
550 return V->getValueID() == ConstantPointerNullVal;
554 //===----------------------------------------------------------------------===//
555 /// ConstantDataSequential - A vector or array of data that contains no
556 /// relocations, and whose element type is a simple 1/2/4/8-byte integer or
557 /// float/double. This is the common base class of ConstantDataArray and
558 /// ConstantDataVector.
560 class ConstantDataSequential : public Constant {
561 friend class LLVMContextImpl;
562 /// DataElements - A pointer to the bytes underlying this constant (which is
563 /// owned by the uniquing StringMap).
564 const char *DataElements;
566 /// Next - This forms a link list of ConstantDataSequential nodes that have
567 /// the same value but different type. For example, 0,0,0,1 could be a 4
568 /// element array of i8, or a 1-element array of i32. They'll both end up in
569 /// the same StringMap bucket, linked up.
570 ConstantDataSequential *Next;
571 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
572 ConstantDataSequential(const ConstantDataSequential &); // DO NOT IMPLEMENT
574 explicit ConstantDataSequential(Type *ty, ValueTy VT, const char *Data)
575 : Constant(ty, VT, 0, 0), DataElements(Data) {}
576 ~ConstantDataSequential() { delete Next; }
578 static Constant *getImpl(StringRef Bytes, Type *Ty);
581 // allocate space for exactly zero operands.
582 void *operator new(size_t s) {
583 return User::operator new(s, 0);
587 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
588 /// formed with a vector or array of the specified element type.
589 /// ConstantDataArray only works with normal float and int types that are
590 /// stored densely in memory, not with things like i42 or x86_f80.
591 static bool isElementTypeCompatible(const Type *Ty);
593 /// getElementAsInteger - If this is a sequential container of integers (of
594 /// any size), return the specified element in the low bits of a uint64_t.
595 uint64_t getElementAsInteger(unsigned i) const;
597 /// getElementAsAPFloat - If this is a sequential container of floating point
598 /// type, return the specified element as an APFloat.
599 APFloat getElementAsAPFloat(unsigned i) const;
601 /// getElementAsFloat - If this is an sequential container of floats, return
602 /// the specified element as a float.
603 float getElementAsFloat(unsigned i) const;
605 /// getElementAsDouble - If this is an sequential container of doubles, return
606 /// the specified element as a float.
607 double getElementAsDouble(unsigned i) const;
609 /// getElementAsConstant - Return a Constant for a specified index's element.
610 /// Note that this has to compute a new constant to return, so it isn't as
611 /// efficient as getElementAsInteger/Float/Double.
612 Constant *getElementAsConstant(unsigned i) const;
614 /// getType - Specialize the getType() method to always return a
615 /// SequentialType, which reduces the amount of casting needed in parts of the
617 inline SequentialType *getType() const {
618 return reinterpret_cast<SequentialType*>(Value::getType());
621 /// getElementType - Return the element type of the array/vector.
622 Type *getElementType() const;
624 /// getElementByteSize - Return the size (in bytes) of each element in the
625 /// array/vector. The size of the elements is known to be a multiple of one
627 uint64_t getElementByteSize() const;
629 virtual void destroyConstant();
631 /// Methods for support type inquiry through isa, cast, and dyn_cast:
633 static bool classof(const ConstantDataSequential *) { return true; }
634 static bool classof(const Value *V) {
635 return V->getValueID() == ConstantDataArrayVal ||
636 V->getValueID() == ConstantDataVectorVal;
639 const char *getElementPointer(unsigned Elt) const;
642 //===----------------------------------------------------------------------===//
643 /// ConstantDataArray - An array of data that contains no relocations, and whose
644 /// element type is a simple 1/2/4/8-byte integer or float/double.
646 class ConstantDataArray : public ConstantDataSequential {
647 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
648 ConstantDataArray(const ConstantDataArray &); // DO NOT IMPLEMENT
649 virtual void anchor();
650 friend class ConstantDataSequential;
651 explicit ConstantDataArray(Type *ty, const char *Data)
652 : ConstantDataSequential(ty, ConstantDataArrayVal, Data) {}
654 // allocate space for exactly zero operands.
655 void *operator new(size_t s) {
656 return User::operator new(s, 0);
660 /// get() constructors - Return a constant with array type with an element
661 /// count and element type matching the ArrayRef passed in. Note that this
662 /// can return a ConstantAggregateZero object.
663 static Constant *get(ArrayRef<uint8_t> Elts, LLVMContext &Context);
664 static Constant *get(ArrayRef<uint16_t> Elts, LLVMContext &Context);
665 static Constant *get(ArrayRef<uint32_t> Elts, LLVMContext &Context);
666 static Constant *get(ArrayRef<uint64_t> Elts, LLVMContext &Context);
667 static Constant *get(ArrayRef<float> Elts, LLVMContext &Context);
668 static Constant *get(ArrayRef<double> Elts, LLVMContext &Context);
670 /// getType - Specialize the getType() method to always return an ArrayType,
671 /// which reduces the amount of casting needed in parts of the compiler.
673 inline ArrayType *getType() const {
674 return reinterpret_cast<ArrayType*>(Value::getType());
677 /// Methods for support type inquiry through isa, cast, and dyn_cast:
679 static bool classof(const ConstantDataArray *) { return true; }
680 static bool classof(const Value *V) {
681 return V->getValueID() == ConstantDataArrayVal;
685 //===----------------------------------------------------------------------===//
686 /// ConstantDataVector - A vector of data that contains no relocations, and
687 /// whose element type is a simple 1/2/4/8-byte integer or float/double.
689 class ConstantDataVector : public ConstantDataSequential {
690 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
691 ConstantDataVector(const ConstantDataVector &); // DO NOT IMPLEMENT
692 virtual void anchor();
693 friend class ConstantDataSequential;
694 explicit ConstantDataVector(Type *ty, const char *Data)
695 : ConstantDataSequential(ty, ConstantDataVectorVal, Data) {}
697 // allocate space for exactly zero operands.
698 void *operator new(size_t s) {
699 return User::operator new(s, 0);
703 /// get() constructors - Return a constant with vector type with an element
704 /// count and element type matching the ArrayRef passed in. Note that this
705 /// can return a ConstantAggregateZero object.
706 static Constant *get(ArrayRef<uint8_t> Elts, LLVMContext &Context);
707 static Constant *get(ArrayRef<uint16_t> Elts, LLVMContext &Context);
708 static Constant *get(ArrayRef<uint32_t> Elts, LLVMContext &Context);
709 static Constant *get(ArrayRef<uint64_t> Elts, LLVMContext &Context);
710 static Constant *get(ArrayRef<float> Elts, LLVMContext &Context);
711 static Constant *get(ArrayRef<double> Elts, LLVMContext &Context);
713 /// getType - Specialize the getType() method to always return a VectorType,
714 /// which reduces the amount of casting needed in parts of the compiler.
716 inline VectorType *getType() const {
717 return reinterpret_cast<VectorType*>(Value::getType());
720 /// Methods for support type inquiry through isa, cast, and dyn_cast:
722 static bool classof(const ConstantDataVector *) { return true; }
723 static bool classof(const Value *V) {
724 return V->getValueID() == ConstantDataVectorVal;
730 /// BlockAddress - The address of a basic block.
732 class BlockAddress : public Constant {
733 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
734 void *operator new(size_t s) { return User::operator new(s, 2); }
735 BlockAddress(Function *F, BasicBlock *BB);
737 /// get - Return a BlockAddress for the specified function and basic block.
738 static BlockAddress *get(Function *F, BasicBlock *BB);
740 /// get - Return a BlockAddress for the specified basic block. The basic
741 /// block must be embedded into a function.
742 static BlockAddress *get(BasicBlock *BB);
744 /// Transparently provide more efficient getOperand methods.
745 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
747 Function *getFunction() const { return (Function*)Op<0>().get(); }
748 BasicBlock *getBasicBlock() const { return (BasicBlock*)Op<1>().get(); }
750 virtual void destroyConstant();
751 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
753 /// Methods for support type inquiry through isa, cast, and dyn_cast:
754 static inline bool classof(const BlockAddress *) { return true; }
755 static inline bool classof(const Value *V) {
756 return V->getValueID() == BlockAddressVal;
761 struct OperandTraits<BlockAddress> :
762 public FixedNumOperandTraits<BlockAddress, 2> {
765 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(BlockAddress, Value)
768 //===----------------------------------------------------------------------===//
769 /// ConstantExpr - a constant value that is initialized with an expression using
770 /// other constant values.
772 /// This class uses the standard Instruction opcodes to define the various
773 /// constant expressions. The Opcode field for the ConstantExpr class is
774 /// maintained in the Value::SubclassData field.
775 class ConstantExpr : public Constant {
776 friend struct ConstantCreator<ConstantExpr,Type,
777 std::pair<unsigned, std::vector<Constant*> > >;
778 friend struct ConvertConstantType<ConstantExpr, Type>;
781 ConstantExpr(Type *ty, unsigned Opcode, Use *Ops, unsigned NumOps)
782 : Constant(ty, ConstantExprVal, Ops, NumOps) {
783 // Operation type (an Instruction opcode) is stored as the SubclassData.
784 setValueSubclassData(Opcode);
788 // Static methods to construct a ConstantExpr of different kinds. Note that
789 // these methods may return a object that is not an instance of the
790 // ConstantExpr class, because they will attempt to fold the constant
791 // expression into something simpler if possible.
793 /// getAlignOf constant expr - computes the alignment of a type in a target
794 /// independent way (Note: the return type is an i64).
795 static Constant *getAlignOf(Type *Ty);
797 /// getSizeOf constant expr - computes the (alloc) size of a type (in
798 /// address-units, not bits) in a target independent way (Note: the return
801 static Constant *getSizeOf(Type *Ty);
803 /// getOffsetOf constant expr - computes the offset of a struct field in a
804 /// target independent way (Note: the return type is an i64).
806 static Constant *getOffsetOf(StructType *STy, unsigned FieldNo);
808 /// getOffsetOf constant expr - This is a generalized form of getOffsetOf,
809 /// which supports any aggregate type, and any Constant index.
811 static Constant *getOffsetOf(Type *Ty, Constant *FieldNo);
813 static Constant *getNeg(Constant *C, bool HasNUW = false, bool HasNSW =false);
814 static Constant *getFNeg(Constant *C);
815 static Constant *getNot(Constant *C);
816 static Constant *getAdd(Constant *C1, Constant *C2,
817 bool HasNUW = false, bool HasNSW = false);
818 static Constant *getFAdd(Constant *C1, Constant *C2);
819 static Constant *getSub(Constant *C1, Constant *C2,
820 bool HasNUW = false, bool HasNSW = false);
821 static Constant *getFSub(Constant *C1, Constant *C2);
822 static Constant *getMul(Constant *C1, Constant *C2,
823 bool HasNUW = false, bool HasNSW = false);
824 static Constant *getFMul(Constant *C1, Constant *C2);
825 static Constant *getUDiv(Constant *C1, Constant *C2, bool isExact = false);
826 static Constant *getSDiv(Constant *C1, Constant *C2, bool isExact = false);
827 static Constant *getFDiv(Constant *C1, Constant *C2);
828 static Constant *getURem(Constant *C1, Constant *C2);
829 static Constant *getSRem(Constant *C1, Constant *C2);
830 static Constant *getFRem(Constant *C1, Constant *C2);
831 static Constant *getAnd(Constant *C1, Constant *C2);
832 static Constant *getOr(Constant *C1, Constant *C2);
833 static Constant *getXor(Constant *C1, Constant *C2);
834 static Constant *getShl(Constant *C1, Constant *C2,
835 bool HasNUW = false, bool HasNSW = false);
836 static Constant *getLShr(Constant *C1, Constant *C2, bool isExact = false);
837 static Constant *getAShr(Constant *C1, Constant *C2, bool isExact = false);
838 static Constant *getTrunc (Constant *C, Type *Ty);
839 static Constant *getSExt (Constant *C, Type *Ty);
840 static Constant *getZExt (Constant *C, Type *Ty);
841 static Constant *getFPTrunc (Constant *C, Type *Ty);
842 static Constant *getFPExtend(Constant *C, Type *Ty);
843 static Constant *getUIToFP (Constant *C, Type *Ty);
844 static Constant *getSIToFP (Constant *C, Type *Ty);
845 static Constant *getFPToUI (Constant *C, Type *Ty);
846 static Constant *getFPToSI (Constant *C, Type *Ty);
847 static Constant *getPtrToInt(Constant *C, Type *Ty);
848 static Constant *getIntToPtr(Constant *C, Type *Ty);
849 static Constant *getBitCast (Constant *C, Type *Ty);
851 static Constant *getNSWNeg(Constant *C) { return getNeg(C, false, true); }
852 static Constant *getNUWNeg(Constant *C) { return getNeg(C, true, false); }
853 static Constant *getNSWAdd(Constant *C1, Constant *C2) {
854 return getAdd(C1, C2, false, true);
856 static Constant *getNUWAdd(Constant *C1, Constant *C2) {
857 return getAdd(C1, C2, true, false);
859 static Constant *getNSWSub(Constant *C1, Constant *C2) {
860 return getSub(C1, C2, false, true);
862 static Constant *getNUWSub(Constant *C1, Constant *C2) {
863 return getSub(C1, C2, true, false);
865 static Constant *getNSWMul(Constant *C1, Constant *C2) {
866 return getMul(C1, C2, false, true);
868 static Constant *getNUWMul(Constant *C1, Constant *C2) {
869 return getMul(C1, C2, true, false);
871 static Constant *getNSWShl(Constant *C1, Constant *C2) {
872 return getShl(C1, C2, false, true);
874 static Constant *getNUWShl(Constant *C1, Constant *C2) {
875 return getShl(C1, C2, true, false);
877 static Constant *getExactSDiv(Constant *C1, Constant *C2) {
878 return getSDiv(C1, C2, true);
880 static Constant *getExactUDiv(Constant *C1, Constant *C2) {
881 return getUDiv(C1, C2, true);
883 static Constant *getExactAShr(Constant *C1, Constant *C2) {
884 return getAShr(C1, C2, true);
886 static Constant *getExactLShr(Constant *C1, Constant *C2) {
887 return getLShr(C1, C2, true);
890 /// Transparently provide more efficient getOperand methods.
891 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
893 // @brief Convenience function for getting one of the casting operations
894 // using a CastOps opcode.
895 static Constant *getCast(
896 unsigned ops, ///< The opcode for the conversion
897 Constant *C, ///< The constant to be converted
898 Type *Ty ///< The type to which the constant is converted
901 // @brief Create a ZExt or BitCast cast constant expression
902 static Constant *getZExtOrBitCast(
903 Constant *C, ///< The constant to zext or bitcast
904 Type *Ty ///< The type to zext or bitcast C to
907 // @brief Create a SExt or BitCast cast constant expression
908 static Constant *getSExtOrBitCast(
909 Constant *C, ///< The constant to sext or bitcast
910 Type *Ty ///< The type to sext or bitcast C to
913 // @brief Create a Trunc or BitCast cast constant expression
914 static Constant *getTruncOrBitCast(
915 Constant *C, ///< The constant to trunc or bitcast
916 Type *Ty ///< The type to trunc or bitcast C to
919 /// @brief Create a BitCast or a PtrToInt cast constant expression
920 static Constant *getPointerCast(
921 Constant *C, ///< The pointer value to be casted (operand 0)
922 Type *Ty ///< The type to which cast should be made
925 /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
926 static Constant *getIntegerCast(
927 Constant *C, ///< The integer constant to be casted
928 Type *Ty, ///< The integer type to cast to
929 bool isSigned ///< Whether C should be treated as signed or not
932 /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
933 static Constant *getFPCast(
934 Constant *C, ///< The integer constant to be casted
935 Type *Ty ///< The integer type to cast to
938 /// @brief Return true if this is a convert constant expression
941 /// @brief Return true if this is a compare constant expression
942 bool isCompare() const;
944 /// @brief Return true if this is an insertvalue or extractvalue expression,
945 /// and the getIndices() method may be used.
946 bool hasIndices() const;
948 /// @brief Return true if this is a getelementptr expression and all
949 /// the index operands are compile-time known integers within the
950 /// corresponding notional static array extents. Note that this is
951 /// not equivalant to, a subset of, or a superset of the "inbounds"
953 bool isGEPWithNoNotionalOverIndexing() const;
955 /// Select constant expr
957 static Constant *getSelect(Constant *C, Constant *V1, Constant *V2);
959 /// get - Return a binary or shift operator constant expression,
960 /// folding if possible.
962 static Constant *get(unsigned Opcode, Constant *C1, Constant *C2,
965 /// @brief Return an ICmp or FCmp comparison operator constant expression.
966 static Constant *getCompare(unsigned short pred, Constant *C1, Constant *C2);
968 /// get* - Return some common constants without having to
969 /// specify the full Instruction::OPCODE identifier.
971 static Constant *getICmp(unsigned short pred, Constant *LHS, Constant *RHS);
972 static Constant *getFCmp(unsigned short pred, Constant *LHS, Constant *RHS);
974 /// Getelementptr form. Value* is only accepted for convenience;
975 /// all elements must be Constant's.
977 static Constant *getGetElementPtr(Constant *C,
978 ArrayRef<Constant *> IdxList,
979 bool InBounds = false) {
980 return getGetElementPtr(C, makeArrayRef((Value * const *)IdxList.data(),
984 static Constant *getGetElementPtr(Constant *C,
986 bool InBounds = false) {
987 // This form of the function only exists to avoid ambiguous overload
988 // warnings about whether to convert Idx to ArrayRef<Constant *> or
989 // ArrayRef<Value *>.
990 return getGetElementPtr(C, cast<Value>(Idx), InBounds);
992 static Constant *getGetElementPtr(Constant *C,
993 ArrayRef<Value *> IdxList,
994 bool InBounds = false);
996 /// Create an "inbounds" getelementptr. See the documentation for the
997 /// "inbounds" flag in LangRef.html for details.
998 static Constant *getInBoundsGetElementPtr(Constant *C,
999 ArrayRef<Constant *> IdxList) {
1000 return getGetElementPtr(C, IdxList, true);
1002 static Constant *getInBoundsGetElementPtr(Constant *C,
1004 // This form of the function only exists to avoid ambiguous overload
1005 // warnings about whether to convert Idx to ArrayRef<Constant *> or
1006 // ArrayRef<Value *>.
1007 return getGetElementPtr(C, Idx, true);
1009 static Constant *getInBoundsGetElementPtr(Constant *C,
1010 ArrayRef<Value *> IdxList) {
1011 return getGetElementPtr(C, IdxList, true);
1014 static Constant *getExtractElement(Constant *Vec, Constant *Idx);
1015 static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
1016 static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
1017 static Constant *getExtractValue(Constant *Agg, ArrayRef<unsigned> Idxs);
1018 static Constant *getInsertValue(Constant *Agg, Constant *Val,
1019 ArrayRef<unsigned> Idxs);
1021 /// getOpcode - Return the opcode at the root of this constant expression
1022 unsigned getOpcode() const { return getSubclassDataFromValue(); }
1024 /// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
1025 /// not an ICMP or FCMP constant expression.
1026 unsigned getPredicate() const;
1028 /// getIndices - Assert that this is an insertvalue or exactvalue
1029 /// expression and return the list of indices.
1030 ArrayRef<unsigned> getIndices() const;
1032 /// getOpcodeName - Return a string representation for an opcode.
1033 const char *getOpcodeName() const;
1035 /// getWithOperandReplaced - Return a constant expression identical to this
1036 /// one, but with the specified operand set to the specified value.
1037 Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
1039 /// getWithOperands - This returns the current constant expression with the
1040 /// operands replaced with the specified values. The specified array must
1041 /// have the same number of operands as our current one.
1042 Constant *getWithOperands(ArrayRef<Constant*> Ops) const {
1043 return getWithOperands(Ops, getType());
1046 /// getWithOperands - This returns the current constant expression with the
1047 /// operands replaced with the specified values and with the specified result
1048 /// type. The specified array must have the same number of operands as our
1050 Constant *getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const;
1052 virtual void destroyConstant();
1053 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
1055 /// Methods for support type inquiry through isa, cast, and dyn_cast:
1056 static inline bool classof(const ConstantExpr *) { return true; }
1057 static inline bool classof(const Value *V) {
1058 return V->getValueID() == ConstantExprVal;
1062 // Shadow Value::setValueSubclassData with a private forwarding method so that
1063 // subclasses cannot accidentally use it.
1064 void setValueSubclassData(unsigned short D) {
1065 Value::setValueSubclassData(D);
1070 struct OperandTraits<ConstantExpr> :
1071 public VariadicOperandTraits<ConstantExpr, 1> {
1074 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantExpr, Constant)
1076 //===----------------------------------------------------------------------===//
1077 /// UndefValue - 'undef' values are things that do not have specified contents.
1078 /// These are used for a variety of purposes, including global variable
1079 /// initializers and operands to instructions. 'undef' values can occur with
1080 /// any first-class type.
1082 /// Undef values aren't exactly constants; if they have multiple uses, they
1083 /// can appear to have different bit patterns at each use. See
1084 /// LangRef.html#undefvalues for details.
1086 class UndefValue : public Constant {
1087 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
1088 UndefValue(const UndefValue &); // DO NOT IMPLEMENT
1090 explicit UndefValue(Type *T) : Constant(T, UndefValueVal, 0, 0) {}
1092 // allocate space for exactly zero operands
1093 void *operator new(size_t s) {
1094 return User::operator new(s, 0);
1097 /// get() - Static factory methods - Return an 'undef' object of the specified
1100 static UndefValue *get(Type *T);
1102 /// getSequentialElement - If this Undef has array or vector type, return a
1103 /// undef with the right element type.
1104 UndefValue *getSequentialElement();
1106 /// getStructElement - If this undef has struct type, return a undef with the
1107 /// right element type for the specified element.
1108 UndefValue *getStructElement(unsigned Elt);
1110 /// getElementValue - Return an undef of the right value for the specified GEP
1112 UndefValue *getElementValue(Constant *C);
1114 /// getElementValue - Return an undef of the right value for the specified GEP
1116 UndefValue *getElementValue(unsigned Idx);
1118 virtual void destroyConstant();
1120 /// Methods for support type inquiry through isa, cast, and dyn_cast:
1121 static inline bool classof(const UndefValue *) { return true; }
1122 static bool classof(const Value *V) {
1123 return V->getValueID() == UndefValueVal;
1127 } // End llvm namespace