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/Type.h"
26 #include "llvm/OperandTraits.h"
27 #include "llvm/ADT/APInt.h"
28 #include "llvm/ADT/APFloat.h"
29 #include "llvm/ADT/SmallVector.h"
38 template<class ConstantClass, class TypeClass, class ValType>
39 struct ConstantCreator;
40 template<class ConstantClass, class TypeClass>
41 struct ConvertConstantType;
43 //===----------------------------------------------------------------------===//
44 /// This is the shared class of boolean and integer constants. This class
45 /// represents both boolean and integral constants.
46 /// @brief Class for constant integers.
47 class ConstantInt : public Constant {
48 static ConstantInt *TheTrueVal, *TheFalseVal;
49 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
50 ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
51 ConstantInt(const IntegerType *Ty, const APInt& V);
54 // allocate space for exactly zero operands
55 void *operator new(size_t s) {
56 return User::operator new(s, 0);
59 /// Return the constant as an APInt value reference. This allows clients to
60 /// obtain a copy of the value, with all its precision in tact.
61 /// @brief Return the constant's value.
62 inline const APInt& getValue() const {
66 /// getBitWidth - Return the bitwidth of this constant.
67 unsigned getBitWidth() const { return Val.getBitWidth(); }
69 /// Return the constant as a 64-bit unsigned integer value after it
70 /// has been zero extended as appropriate for the type of this constant. Note
71 /// that this method can assert if the value does not fit in 64 bits.
73 /// @brief Return the zero extended value.
74 inline uint64_t getZExtValue() const {
75 return Val.getZExtValue();
78 /// Return the constant as a 64-bit integer value after it has been sign
79 /// extended as appropriate for the type of this constant. Note that
80 /// this method can assert if the value does not fit in 64 bits.
82 /// @brief Return the sign extended value.
83 inline int64_t getSExtValue() const {
84 return Val.getSExtValue();
87 /// A helper method that can be used to determine if the constant contained
88 /// within is equal to a constant. This only works for very small values,
89 /// because this is all that can be represented with all types.
90 /// @brief Determine if this constant's value is same as an unsigned char.
91 bool equalsInt(uint64_t V) const {
95 /// getTrue/getFalse - Return the singleton true/false values.
96 static inline ConstantInt *getTrue() {
97 if (TheTrueVal) return TheTrueVal;
98 return CreateTrueFalseVals(true);
100 static inline ConstantInt *getFalse() {
101 if (TheFalseVal) return TheFalseVal;
102 return CreateTrueFalseVals(false);
105 /// Return a ConstantInt with the specified value for the specified type. The
106 /// value V will be canonicalized to an unsigned APInt. Accessing it with
107 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
108 /// signed value for the type Ty.
109 /// @brief Get a ConstantInt for a specific value.
110 static ConstantInt *get(const IntegerType *Ty,
111 uint64_t V, bool isSigned = false);
112 static Constant *get(const Type *Ty, uint64_t V, bool isSigned = false);
114 /// Return a ConstantInt with the specified value for the specified type. The
115 /// value V will be canonicalized to a an unsigned APInt. Accessing it with
116 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
117 /// signed value for the type Ty.
118 /// @brief Get a ConstantInt for a specific signed value.
119 static ConstantInt *getSigned(const IntegerType *Ty, int64_t V) {
120 return get(Ty, V, true);
122 static Constant *getSigned(const Type *Ty, int64_t V) {
123 return get(Ty, V, true);
126 /// Return a ConstantInt with the specified value and an implied Type. The
127 /// type is the integer type that corresponds to the bit width of the value.
128 static ConstantInt *get(const APInt &V);
130 /// If Ty is a vector type, return a Constant with a splat of the given
131 /// value. Otherwise return a ConstantInt for the given value.
132 static Constant *get(const Type *Ty, const APInt &V);
134 /// getType - Specialize the getType() method to always return an IntegerType,
135 /// which reduces the amount of casting needed in parts of the compiler.
137 inline const IntegerType *getType() const {
138 return reinterpret_cast<const IntegerType*>(Value::getType());
141 /// This static method returns true if the type Ty is big enough to
142 /// represent the value V. This can be used to avoid having the get method
143 /// assert when V is larger than Ty can represent. Note that there are two
144 /// versions of this method, one for unsigned and one for signed integers.
145 /// Although ConstantInt canonicalizes everything to an unsigned integer,
146 /// the signed version avoids callers having to convert a signed quantity
147 /// to the appropriate unsigned type before calling the method.
148 /// @returns true if V is a valid value for type Ty
149 /// @brief Determine if the value is in range for the given type.
150 static bool isValueValidForType(const Type *Ty, uint64_t V);
151 static bool isValueValidForType(const Type *Ty, int64_t V);
153 /// This function will return true iff this constant represents the "null"
154 /// value that would be returned by the getNullValue method.
155 /// @returns true if this is the null integer value.
156 /// @brief Determine if the value is null.
157 virtual bool isNullValue() const {
161 /// This is just a convenience method to make client code smaller for a
162 /// common code. It also correctly performs the comparison without the
163 /// potential for an assertion from getZExtValue().
164 bool isZero() const {
168 /// This is just a convenience method to make client code smaller for a
169 /// common case. It also correctly performs the comparison without the
170 /// potential for an assertion from getZExtValue().
171 /// @brief Determine if the value is one.
176 /// This function will return true iff every bit in this constant is set
178 /// @returns true iff this constant's bits are all set to true.
179 /// @brief Determine if the value is all ones.
180 bool isAllOnesValue() const {
181 return Val.isAllOnesValue();
184 /// This function will return true iff this constant represents the largest
185 /// value that may be represented by the constant's type.
186 /// @returns true iff this is the largest value that may be represented
188 /// @brief Determine if the value is maximal.
189 bool isMaxValue(bool isSigned) const {
191 return Val.isMaxSignedValue();
193 return Val.isMaxValue();
196 /// This function will return true iff this constant represents the smallest
197 /// value that may be represented by this constant's type.
198 /// @returns true if this is the smallest value that may be represented by
200 /// @brief Determine if the value is minimal.
201 bool isMinValue(bool isSigned) const {
203 return Val.isMinSignedValue();
205 return Val.isMinValue();
208 /// This function will return true iff this constant represents a value with
209 /// active bits bigger than 64 bits or a value greater than the given uint64_t
211 /// @returns true iff this constant is greater or equal to the given number.
212 /// @brief Determine if the value is greater or equal to the given number.
213 bool uge(uint64_t Num) {
214 return Val.getActiveBits() > 64 || Val.getZExtValue() >= Num;
217 /// getLimitedValue - If the value is smaller than the specified limit,
218 /// return it, otherwise return the limit value. This causes the value
219 /// to saturate to the limit.
220 /// @returns the min of the value of the constant and the specified value
221 /// @brief Get the constant's value with a saturation limit
222 uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
223 return Val.getLimitedValue(Limit);
226 /// @returns the value for an integer constant of the given type that has all
227 /// its bits set to true.
228 /// @brief Get the all ones value
229 static ConstantInt *getAllOnesValue(const Type *Ty);
231 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
232 static inline bool classof(const ConstantInt *) { return true; }
233 static bool classof(const Value *V) {
234 return V->getValueID() == ConstantIntVal;
236 static void ResetTrueFalse() { TheTrueVal = TheFalseVal = 0; }
238 static ConstantInt *CreateTrueFalseVals(bool WhichOne);
242 //===----------------------------------------------------------------------===//
243 /// ConstantFP - Floating Point Values [float, double]
245 class ConstantFP : public Constant {
247 void *operator new(size_t, unsigned);// DO NOT IMPLEMENT
248 ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
250 ConstantFP(const Type *Ty, const APFloat& V);
252 // allocate space for exactly zero operands
253 void *operator new(size_t s) {
254 return User::operator new(s, 0);
257 /// get() - Static factory methods - Return objects of the specified value
258 static ConstantFP *get(const APFloat &V);
260 /// get() - This returns a constant fp for the specified value in the
261 /// specified type. This should only be used for simple constant values like
262 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
263 static Constant *get(const Type *Ty, double V);
265 /// isValueValidForType - return true if Ty is big enough to represent V.
266 static bool isValueValidForType(const Type *Ty, const APFloat& V);
267 inline const APFloat& getValueAPF() const { return Val; }
269 /// isNullValue - Return true if this is the value that would be returned by
270 /// getNullValue. Don't depend on == for doubles to tell us it's zero, it
271 /// considers -0.0 to be null as well as 0.0. :(
272 virtual bool isNullValue() const;
274 // Get a negative zero.
275 static ConstantFP *getNegativeZero(const Type* Ty);
277 /// isExactlyValue - We don't rely on operator== working on double values, as
278 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
279 /// As such, this method can be used to do an exact bit-for-bit comparison of
280 /// two floating point values. The version with a double operand is retained
281 /// because it's so convenient to write isExactlyValue(2.0), but please use
282 /// it only for simple constants.
283 bool isExactlyValue(const APFloat& V) const;
285 bool isExactlyValue(double V) const {
287 // convert is not supported on this type
288 if (&Val.getSemantics() == &APFloat::PPCDoubleDouble)
291 FV.convert(Val.getSemantics(), APFloat::rmNearestTiesToEven, &ignored);
292 return isExactlyValue(FV);
294 /// Methods for support type inquiry through isa, cast, and dyn_cast:
295 static inline bool classof(const ConstantFP *) { return true; }
296 static bool classof(const Value *V) {
297 return V->getValueID() == ConstantFPVal;
301 //===----------------------------------------------------------------------===//
302 /// ConstantAggregateZero - All zero aggregate value
304 class ConstantAggregateZero : public Constant {
305 friend struct ConstantCreator<ConstantAggregateZero, Type, char>;
306 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
307 ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
309 explicit ConstantAggregateZero(const Type *ty)
310 : Constant(ty, ConstantAggregateZeroVal, 0, 0) {}
312 // allocate space for exactly zero operands
313 void *operator new(size_t s) {
314 return User::operator new(s, 0);
317 /// get() - static factory method for creating a null aggregate. It is
318 /// illegal to call this method with a non-aggregate type.
319 static ConstantAggregateZero *get(const Type *Ty);
321 /// isNullValue - Return true if this is the value that would be returned by
323 virtual bool isNullValue() const { return true; }
325 virtual void destroyConstant();
327 /// Methods for support type inquiry through isa, cast, and dyn_cast:
329 static bool classof(const ConstantAggregateZero *) { return true; }
330 static bool classof(const Value *V) {
331 return V->getValueID() == ConstantAggregateZeroVal;
336 //===----------------------------------------------------------------------===//
337 /// ConstantArray - Constant Array Declarations
339 class ConstantArray : public Constant {
340 friend struct ConstantCreator<ConstantArray, ArrayType,
341 std::vector<Constant*> >;
342 ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
344 ConstantArray(const ArrayType *T, const std::vector<Constant*> &Val);
346 /// get() - Static factory methods - Return objects of the specified value
347 static Constant *get(const ArrayType *T, const std::vector<Constant*> &);
348 static Constant *get(const ArrayType *T,
349 Constant*const*Vals, unsigned NumVals) {
350 // FIXME: make this the primary ctor method.
351 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
354 /// This method constructs a ConstantArray and initializes it with a text
355 /// string. The default behavior (AddNull==true) causes a null terminator to
356 /// be placed at the end of the array. This effectively increases the length
357 /// of the array by one (you've been warned). However, in some situations
358 /// this is not desired so if AddNull==false then the string is copied without
359 /// null termination.
360 static Constant *get(const std::string &Initializer, bool AddNull = true);
362 /// Transparently provide more efficient getOperand methods.
363 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
365 /// getType - Specialize the getType() method to always return an ArrayType,
366 /// which reduces the amount of casting needed in parts of the compiler.
368 inline const ArrayType *getType() const {
369 return reinterpret_cast<const ArrayType*>(Value::getType());
372 /// isString - This method returns true if the array is an array of i8 and
373 /// the elements of the array are all ConstantInt's.
374 bool isString() const;
376 /// isCString - This method returns true if the array is a string (see
378 /// isString) and it ends in a null byte \0 and does not contains any other
380 /// null bytes except its terminator.
381 bool isCString() const;
383 /// getAsString - If this array is isString(), then this method converts the
384 /// array to an std::string and returns it. Otherwise, it asserts out.
386 std::string getAsString() const;
388 /// isNullValue - Return true if this is the value that would be returned by
389 /// getNullValue. This always returns false because zero arrays are always
390 /// created as ConstantAggregateZero objects.
391 virtual bool isNullValue() const { return false; }
393 virtual void destroyConstant();
394 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
396 /// Methods for support type inquiry through isa, cast, and dyn_cast:
397 static inline bool classof(const ConstantArray *) { return true; }
398 static bool classof(const Value *V) {
399 return V->getValueID() == ConstantArrayVal;
404 struct OperandTraits<ConstantArray> : VariadicOperandTraits<> {
407 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantArray, Constant)
409 //===----------------------------------------------------------------------===//
410 // ConstantStruct - Constant Struct Declarations
412 class ConstantStruct : public Constant {
413 friend struct ConstantCreator<ConstantStruct, StructType,
414 std::vector<Constant*> >;
415 ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
417 ConstantStruct(const StructType *T, const std::vector<Constant*> &Val);
419 /// get() - Static factory methods - Return objects of the specified value
421 static Constant *get(const StructType *T, const std::vector<Constant*> &V);
422 static Constant *get(const std::vector<Constant*> &V, bool Packed = false);
423 static Constant *get(Constant*const* Vals, unsigned NumVals,
424 bool Packed = false) {
425 // FIXME: make this the primary ctor method.
426 return get(std::vector<Constant*>(Vals, Vals+NumVals), Packed);
429 /// Transparently provide more efficient getOperand methods.
430 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
432 /// getType() specialization - Reduce amount of casting...
434 inline const StructType *getType() const {
435 return reinterpret_cast<const StructType*>(Value::getType());
438 /// isNullValue - Return true if this is the value that would be returned by
439 /// getNullValue. This always returns false because zero structs are always
440 /// created as ConstantAggregateZero objects.
441 virtual bool isNullValue() const {
445 virtual void destroyConstant();
446 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
448 /// Methods for support type inquiry through isa, cast, and dyn_cast:
449 static inline bool classof(const ConstantStruct *) { return true; }
450 static bool classof(const Value *V) {
451 return V->getValueID() == ConstantStructVal;
456 struct OperandTraits<ConstantStruct> : VariadicOperandTraits<> {
459 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantStruct, Constant)
461 //===----------------------------------------------------------------------===//
462 /// ConstantVector - Constant Vector Declarations
464 class ConstantVector : public Constant {
465 friend struct ConstantCreator<ConstantVector, VectorType,
466 std::vector<Constant*> >;
467 ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
469 ConstantVector(const VectorType *T, const std::vector<Constant*> &Val);
471 /// get() - Static factory methods - Return objects of the specified value
472 static Constant *get(const VectorType *T, const std::vector<Constant*> &);
473 static Constant *get(const std::vector<Constant*> &V);
474 static Constant *get(Constant*const* Vals, unsigned NumVals) {
475 // FIXME: make this the primary ctor method.
476 return get(std::vector<Constant*>(Vals, Vals+NumVals));
479 /// Transparently provide more efficient getOperand methods.
480 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
482 /// getType - Specialize the getType() method to always return a VectorType,
483 /// which reduces the amount of casting needed in parts of the compiler.
485 inline const VectorType *getType() const {
486 return reinterpret_cast<const VectorType*>(Value::getType());
489 /// @returns the value for a vector integer constant of the given type that
490 /// has all its bits set to true.
491 /// @brief Get the all ones value
492 static ConstantVector *getAllOnesValue(const VectorType *Ty);
494 /// isNullValue - Return true if this is the value that would be returned by
495 /// getNullValue. This always returns false because zero vectors are always
496 /// created as ConstantAggregateZero objects.
497 virtual bool isNullValue() const { return false; }
499 /// This function will return true iff every element in this vector constant
500 /// is set to all ones.
501 /// @returns true iff this constant's emements are all set to all ones.
502 /// @brief Determine if the value is all ones.
503 bool isAllOnesValue() const;
505 /// getSplatValue - If this is a splat constant, meaning that all of the
506 /// elements have the same value, return that value. Otherwise return NULL.
507 Constant *getSplatValue();
509 virtual void destroyConstant();
510 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
512 /// Methods for support type inquiry through isa, cast, and dyn_cast:
513 static inline bool classof(const ConstantVector *) { return true; }
514 static bool classof(const Value *V) {
515 return V->getValueID() == ConstantVectorVal;
520 struct OperandTraits<ConstantVector> : VariadicOperandTraits<> {
523 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantVector, Constant)
525 //===----------------------------------------------------------------------===//
526 /// ConstantPointerNull - a constant pointer value that points to null
528 class ConstantPointerNull : public Constant {
529 friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
530 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
531 ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
533 explicit ConstantPointerNull(const PointerType *T)
534 : Constant(reinterpret_cast<const Type*>(T),
535 Value::ConstantPointerNullVal, 0, 0) {}
538 // allocate space for exactly zero operands
539 void *operator new(size_t s) {
540 return User::operator new(s, 0);
543 /// get() - Static factory methods - Return objects of the specified value
544 static ConstantPointerNull *get(const PointerType *T);
546 /// isNullValue - Return true if this is the value that would be returned by
548 virtual bool isNullValue() const { return true; }
550 virtual void destroyConstant();
552 /// getType - Specialize the getType() method to always return an PointerType,
553 /// which reduces the amount of casting needed in parts of the compiler.
555 inline const PointerType *getType() const {
556 return reinterpret_cast<const PointerType*>(Value::getType());
559 /// Methods for support type inquiry through isa, cast, and dyn_cast:
560 static inline bool classof(const ConstantPointerNull *) { return true; }
561 static bool classof(const Value *V) {
562 return V->getValueID() == ConstantPointerNullVal;
567 /// ConstantExpr - a constant value that is initialized with an expression using
568 /// other constant values.
570 /// This class uses the standard Instruction opcodes to define the various
571 /// constant expressions. The Opcode field for the ConstantExpr class is
572 /// maintained in the Value::SubclassData field.
573 class ConstantExpr : public Constant {
574 friend struct ConstantCreator<ConstantExpr,Type,
575 std::pair<unsigned, std::vector<Constant*> > >;
576 friend struct ConvertConstantType<ConstantExpr, Type>;
579 ConstantExpr(const Type *ty, unsigned Opcode, Use *Ops, unsigned NumOps)
580 : Constant(ty, ConstantExprVal, Ops, NumOps) {
581 // Operation type (an Instruction opcode) is stored as the SubclassData.
582 SubclassData = Opcode;
585 // These private methods are used by the type resolution code to create
586 // ConstantExprs in intermediate forms.
587 static Constant *getTy(const Type *Ty, unsigned Opcode,
588 Constant *C1, Constant *C2);
589 static Constant *getCompareTy(unsigned short pred, Constant *C1,
591 static Constant *getSelectTy(const Type *Ty,
592 Constant *C1, Constant *C2, Constant *C3);
593 static Constant *getGetElementPtrTy(const Type *Ty, Constant *C,
594 Value* const *Idxs, unsigned NumIdxs);
595 static Constant *getExtractElementTy(const Type *Ty, Constant *Val,
597 static Constant *getInsertElementTy(const Type *Ty, Constant *Val,
598 Constant *Elt, Constant *Idx);
599 static Constant *getShuffleVectorTy(const Type *Ty, Constant *V1,
600 Constant *V2, Constant *Mask);
601 static Constant *getExtractValueTy(const Type *Ty, Constant *Agg,
602 const unsigned *Idxs, unsigned NumIdxs);
603 static Constant *getInsertValueTy(const Type *Ty, Constant *Agg,
605 const unsigned *Idxs, unsigned NumIdxs);
608 // Static methods to construct a ConstantExpr of different kinds. Note that
609 // these methods may return a object that is not an instance of the
610 // ConstantExpr class, because they will attempt to fold the constant
611 // expression into something simpler if possible.
613 /// Cast constant expr
615 static Constant *getTrunc (Constant *C, const Type *Ty);
616 static Constant *getSExt (Constant *C, const Type *Ty);
617 static Constant *getZExt (Constant *C, const Type *Ty);
618 static Constant *getFPTrunc (Constant *C, const Type *Ty);
619 static Constant *getFPExtend(Constant *C, const Type *Ty);
620 static Constant *getUIToFP (Constant *C, const Type *Ty);
621 static Constant *getSIToFP (Constant *C, const Type *Ty);
622 static Constant *getFPToUI (Constant *C, const Type *Ty);
623 static Constant *getFPToSI (Constant *C, const Type *Ty);
624 static Constant *getPtrToInt(Constant *C, const Type *Ty);
625 static Constant *getIntToPtr(Constant *C, const Type *Ty);
626 static Constant *getBitCast (Constant *C, const Type *Ty);
628 /// Transparently provide more efficient getOperand methods.
629 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
631 // @brief Convenience function for getting one of the casting operations
632 // using a CastOps opcode.
633 static Constant *getCast(
634 unsigned ops, ///< The opcode for the conversion
635 Constant *C, ///< The constant to be converted
636 const Type *Ty ///< The type to which the constant is converted
639 // @brief Create a ZExt or BitCast cast constant expression
640 static Constant *getZExtOrBitCast(
641 Constant *C, ///< The constant to zext or bitcast
642 const Type *Ty ///< The type to zext or bitcast C to
645 // @brief Create a SExt or BitCast cast constant expression
646 static Constant *getSExtOrBitCast(
647 Constant *C, ///< The constant to sext or bitcast
648 const Type *Ty ///< The type to sext or bitcast C to
651 // @brief Create a Trunc or BitCast cast constant expression
652 static Constant *getTruncOrBitCast(
653 Constant *C, ///< The constant to trunc or bitcast
654 const Type *Ty ///< The type to trunc or bitcast C to
657 /// @brief Create a BitCast or a PtrToInt cast constant expression
658 static Constant *getPointerCast(
659 Constant *C, ///< The pointer value to be casted (operand 0)
660 const Type *Ty ///< The type to which cast should be made
663 /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
664 static Constant *getIntegerCast(
665 Constant *C, ///< The integer constant to be casted
666 const Type *Ty, ///< The integer type to cast to
667 bool isSigned ///< Whether C should be treated as signed or not
670 /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
671 static Constant *getFPCast(
672 Constant *C, ///< The integer constant to be casted
673 const Type *Ty ///< The integer type to cast to
676 /// @brief Return true if this is a convert constant expression
679 /// @brief Return true if this is a compare constant expression
680 bool isCompare() const;
682 /// @brief Return true if this is an insertvalue or extractvalue expression,
683 /// and the getIndices() method may be used.
684 bool hasIndices() const;
686 /// Select constant expr
688 static Constant *getSelect(Constant *C, Constant *V1, Constant *V2) {
689 return getSelectTy(V1->getType(), C, V1, V2);
692 /// getAlignOf constant expr - computes the alignment of a type in a target
693 /// independent way (Note: the return type is an i32; Note: assumes that i8
694 /// is byte aligned).
696 static Constant *getAlignOf(const Type *Ty);
698 /// getSizeOf constant expr - computes the size of a type in a target
699 /// independent way (Note: the return type is an i64).
701 static Constant *getSizeOf(const Type *Ty);
703 /// ConstantExpr::get - Return a binary or shift operator constant expression,
704 /// folding if possible.
706 static Constant *get(unsigned Opcode, Constant *C1, Constant *C2);
708 /// @brief Return an ICmp, FCmp, VICmp, or VFCmp comparison operator constant
710 static Constant *getCompare(unsigned short pred, Constant *C1, Constant *C2);
712 /// ConstantExpr::get* - Return some common constants without having to
713 /// specify the full Instruction::OPCODE identifier.
715 static Constant *getNeg(Constant *C);
716 static Constant *getFNeg(Constant *C);
717 static Constant *getNot(Constant *C);
718 static Constant *getAdd(Constant *C1, Constant *C2);
719 static Constant *getFAdd(Constant *C1, Constant *C2);
720 static Constant *getSub(Constant *C1, Constant *C2);
721 static Constant *getFSub(Constant *C1, Constant *C2);
722 static Constant *getMul(Constant *C1, Constant *C2);
723 static Constant *getFMul(Constant *C1, Constant *C2);
724 static Constant *getUDiv(Constant *C1, Constant *C2);
725 static Constant *getSDiv(Constant *C1, Constant *C2);
726 static Constant *getFDiv(Constant *C1, Constant *C2);
727 static Constant *getURem(Constant *C1, Constant *C2); // unsigned rem
728 static Constant *getSRem(Constant *C1, Constant *C2); // signed rem
729 static Constant *getFRem(Constant *C1, Constant *C2);
730 static Constant *getAnd(Constant *C1, Constant *C2);
731 static Constant *getOr(Constant *C1, Constant *C2);
732 static Constant *getXor(Constant *C1, Constant *C2);
733 static Constant *getICmp(unsigned short pred, Constant *LHS, Constant *RHS);
734 static Constant *getFCmp(unsigned short pred, Constant *LHS, Constant *RHS);
735 static Constant *getVICmp(unsigned short pred, Constant *LHS, Constant *RHS);
736 static Constant *getVFCmp(unsigned short pred, Constant *LHS, Constant *RHS);
737 static Constant *getShl(Constant *C1, Constant *C2);
738 static Constant *getLShr(Constant *C1, Constant *C2);
739 static Constant *getAShr(Constant *C1, Constant *C2);
741 /// Getelementptr form. std::vector<Value*> is only accepted for convenience:
742 /// all elements must be Constant's.
744 static Constant *getGetElementPtr(Constant *C,
745 Constant* const *IdxList, unsigned NumIdx);
746 static Constant *getGetElementPtr(Constant *C,
747 Value* const *IdxList, unsigned NumIdx);
749 static Constant *getExtractElement(Constant *Vec, Constant *Idx);
750 static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
751 static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
752 static Constant *getExtractValue(Constant *Agg,
753 const unsigned *IdxList, unsigned NumIdx);
754 static Constant *getInsertValue(Constant *Agg, Constant *Val,
755 const unsigned *IdxList, unsigned NumIdx);
757 /// Floating point negation must be implemented with f(x) = -0.0 - x. This
758 /// method returns the negative zero constant for floating point or vector
759 /// floating point types; for all other types, it returns the null value.
760 static Constant *getZeroValueForNegationExpr(const Type *Ty);
762 /// isNullValue - Return true if this is the value that would be returned by
764 virtual bool isNullValue() const { return false; }
766 /// getOpcode - Return the opcode at the root of this constant expression
767 unsigned getOpcode() const { return SubclassData; }
769 /// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
770 /// not an ICMP or FCMP constant expression.
771 unsigned getPredicate() const;
773 /// getIndices - Assert that this is an insertvalue or exactvalue
774 /// expression and return the list of indices.
775 const SmallVector<unsigned, 4> &getIndices() const;
777 /// getOpcodeName - Return a string representation for an opcode.
778 const char *getOpcodeName() const;
780 /// getWithOperandReplaced - Return a constant expression identical to this
781 /// one, but with the specified operand set to the specified value.
782 Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
784 /// getWithOperands - This returns the current constant expression with the
785 /// operands replaced with the specified values. The specified operands must
786 /// match count and type with the existing ones.
787 Constant *getWithOperands(const std::vector<Constant*> &Ops) const {
788 return getWithOperands(&Ops[0], (unsigned)Ops.size());
790 Constant *getWithOperands(Constant* const *Ops, unsigned NumOps) const;
792 virtual void destroyConstant();
793 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
795 /// Methods for support type inquiry through isa, cast, and dyn_cast:
796 static inline bool classof(const ConstantExpr *) { return true; }
797 static inline bool classof(const Value *V) {
798 return V->getValueID() == ConstantExprVal;
803 struct OperandTraits<ConstantExpr> : VariadicOperandTraits<1> {
806 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantExpr, Constant)
808 //===----------------------------------------------------------------------===//
809 /// UndefValue - 'undef' values are things that do not have specified contents.
810 /// These are used for a variety of purposes, including global variable
811 /// initializers and operands to instructions. 'undef' values can occur with
814 class UndefValue : public Constant {
815 friend struct ConstantCreator<UndefValue, Type, char>;
816 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
817 UndefValue(const UndefValue &); // DO NOT IMPLEMENT
819 explicit UndefValue(const Type *T) : Constant(T, UndefValueVal, 0, 0) {}
821 // allocate space for exactly zero operands
822 void *operator new(size_t s) {
823 return User::operator new(s, 0);
826 /// get() - Static factory methods - Return an 'undef' object of the specified
829 static UndefValue *get(const Type *T);
831 /// isNullValue - Return true if this is the value that would be returned by
833 virtual bool isNullValue() const { return false; }
835 virtual void destroyConstant();
837 /// Methods for support type inquiry through isa, cast, and dyn_cast:
838 static inline bool classof(const UndefValue *) { return true; }
839 static bool classof(const Value *V) {
840 return V->getValueID() == UndefValueVal;
844 //===----------------------------------------------------------------------===//
845 /// MDString - a single uniqued string.
846 /// These are used to efficiently contain a byte sequence for metadata.
848 class MDString : public Constant {
849 MDString(const MDString &); // DO NOT IMPLEMENT
850 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
851 MDString(const char *begin, const char *end);
853 const char *StrBegin, *StrEnd;
855 // allocate space for exactly zero operands
856 void *operator new(size_t s) {
857 return User::operator new(s, 0);
860 /// get() - Static factory methods - Return objects of the specified value.
862 static MDString *get(const char *StrBegin, const char *StrEnd);
864 /// size() - The length of this string.
866 intptr_t size() const { return StrEnd - StrBegin; }
868 /// begin() - Pointer to the first byte of the string.
870 const char *begin() const { return StrBegin; }
872 /// end() - Pointer to one byte past the end of the string.
874 const char *end() const { return StrEnd; }
876 /// getType() specialization - Type is always MetadataTy.
878 inline const Type *getType() const {
879 return Type::MetadataTy;
882 /// isNullValue - Return true if this is the value that would be returned by
883 /// getNullValue. This always returns false because getNullValue will never
884 /// produce metadata.
885 virtual bool isNullValue() const {
889 virtual void destroyConstant();
891 /// Methods for support type inquiry through isa, cast, and dyn_cast:
892 static inline bool classof(const MDString *) { return true; }
893 static bool classof(const Value *V) {
894 return V->getValueID() == MDStringVal;
898 } // End llvm namespace