1 //===-- llvm/Constants.h - Constant class subclass definitions --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 /// @file This file contains the declarations for the subclasses of Constant,
11 /// which represent the different flavors of constant values that live in LLVM.
12 /// Note that Constants are immutable (once created they never change) and are
13 /// fully shared by structural equivalence. This means that two structurally
14 /// equivalent constants will always have the same address. Constant's are
15 /// created on demand as needed and never deleted: thus clients don't have to
16 /// worry about the lifetime of the objects.
18 //===----------------------------------------------------------------------===//
20 #ifndef LLVM_CONSTANTS_H
21 #define LLVM_CONSTANTS_H
23 #include "llvm/Constant.h"
24 #include "llvm/Type.h"
25 #include "llvm/ADT/APInt.h"
34 template<class ConstantClass, class TypeClass, class ValType>
35 struct ConstantCreator;
36 template<class ConstantClass, class TypeClass>
37 struct ConvertConstantType;
39 //===----------------------------------------------------------------------===//
40 /// This is the shared class of boolean and integer constants. This class
41 /// represents both boolean and integral constants.
42 /// @brief Class for constant integers.
43 class ConstantInt : public Constant {
44 static ConstantInt *TheTrueVal, *TheFalseVal;
45 ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
46 ConstantInt(const IntegerType *Ty, const APInt& V);
49 /// Return the constant as an APInt value reference. This allows clients to
50 /// obtain a copy of the value, with all its precision in tact.
51 /// @brief Return the constant's value.
52 inline const APInt& getValue() const {
56 /// getBitWidth - Return the bitwidth of this constant.
57 unsigned getBitWidth() const { return Val.getBitWidth(); }
59 /// Return the constant as a 64-bit unsigned integer value after it
60 /// has been zero extended as appropriate for the type of this constant. Note
61 /// that this method can assert if the value does not fit in 64 bits.
63 /// @brief Return the zero extended value.
64 inline uint64_t getZExtValue() const {
65 return Val.getZExtValue();
68 /// Return the constant as a 64-bit integer value after it has been sign
69 /// sign extended as appropriate for the type of this constant. Note that
70 /// this method can assert if the value does not fit in 64 bits.
72 /// @brief Return the sign extended value.
73 inline int64_t getSExtValue() const {
74 return Val.getSExtValue();
77 /// A helper method that can be used to determine if the constant contained
78 /// within is equal to a constant. This only works for very small values,
79 /// because this is all that can be represented with all types.
80 /// @brief Determine if this constant's value is same as an unsigned char.
81 bool equalsInt(uint64_t V) const {
85 /// getTrue/getFalse - Return the singleton true/false values.
86 static inline ConstantInt *getTrue() {
87 if (TheTrueVal) return TheTrueVal;
88 return CreateTrueFalseVals(true);
90 static inline ConstantInt *getFalse() {
91 if (TheFalseVal) return TheFalseVal;
92 return CreateTrueFalseVals(false);
95 /// Return a ConstantInt with the specified value for the specified type. The
96 /// value V will be canonicalized to a an unsigned APInt. Accessing it with
97 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
98 /// signed value for the type Ty.
99 /// @brief Get a ConstantInt for a specific value.
100 static ConstantInt *get(const Type *Ty, uint64_t V, bool isSigned = false);
102 /// Return a ConstantInt with the specified value and an implied Type. The
103 /// type is the integer type that corresponds to the bit width of the value.
104 static ConstantInt *get(const APInt &V);
106 /// getType - Specialize the getType() method to always return an IntegerType,
107 /// which reduces the amount of casting needed in parts of the compiler.
109 inline const IntegerType *getType() const {
110 return reinterpret_cast<const IntegerType*>(Value::getType());
113 /// This static method returns true if the type Ty is big enough to
114 /// represent the value V. This can be used to avoid having the get method
115 /// assert when V is larger than Ty can represent. Note that there are two
116 /// versions of this method, one for unsigned and one for signed integers.
117 /// Although ConstantInt canonicalizes everything to an unsigned integer,
118 /// the signed version avoids callers having to convert a signed quantity
119 /// to the appropriate unsigned type before calling the method.
120 /// @returns true if V is a valid value for type Ty
121 /// @brief Determine if the value is in range for the given type.
122 static bool isValueValidForType(const Type *Ty, uint64_t V);
123 static bool isValueValidForType(const Type *Ty, int64_t V);
125 /// This function will return true iff this constant represents the "null"
126 /// value that would be returned by the getNullValue method.
127 /// @returns true if this is the null integer value.
128 /// @brief Determine if the value is null.
129 virtual bool isNullValue() const {
133 /// This is just a convenience method to make client code smaller for a
134 /// common code. It also correctly performs the comparison without the
135 /// potential for an assertion from getZExtValue().
136 bool isZero() const {
140 /// This is just a convenience method to make client code smaller for a
141 /// common case. It also correctly performs the comparison without the
142 /// potential for an assertion from getZExtValue().
143 /// @brief Determine if the value is one.
148 /// This function will return true iff every bit in this constant is set
150 /// @returns true iff this constant's bits are all set to true.
151 /// @brief Determine if the value is all ones.
152 bool isAllOnesValue() const {
153 return Val.isAllOnesValue();
156 /// This function will return true iff this constant represents the largest
157 /// value that may be represented by the constant's type.
158 /// @returns true iff this is the largest value that may be represented
160 /// @brief Determine if the value is maximal.
161 bool isMaxValue(bool isSigned) const {
163 return Val.isMaxSignedValue();
165 return Val.isMaxValue();
168 /// This function will return true iff this constant represents the smallest
169 /// value that may be represented by this constant's type.
170 /// @returns true if this is the smallest value that may be represented by
172 /// @brief Determine if the value is minimal.
173 bool isMinValue(bool isSigned) const {
175 return Val.isMinSignedValue();
177 return Val.isMinValue();
180 /// This function will return true iff this constant represents a value with
181 /// active bits bigger than 64 bits or a value greater than the given uint64_t
183 /// @returns true iff this constant is greater or equal to the given number.
184 /// @brief Determine if the value is greater or equal to the given number.
185 bool uge(uint64_t Num) {
186 return Val.getActiveBits() > 64 || Val.getZExtValue() >= Num;
189 /// @returns the 64-bit value of this constant if its active bits number is
190 /// not greater than 64, otherwise, just return the given uint64_t number.
191 /// @brief Get the constant's value if possible.
192 uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
193 return Val.getLimitedValue(Limit);
196 /// @returns the value for an integer constant of the given type that has all
197 /// its bits set to true.
198 /// @brief Get the all ones value
199 static ConstantInt *getAllOnesValue(const Type *Ty);
201 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
202 static inline bool classof(const ConstantInt *) { return true; }
203 static bool classof(const Value *V) {
204 return V->getValueID() == ConstantIntVal;
206 static void ResetTrueFalse() { TheTrueVal = TheFalseVal = 0; }
208 static ConstantInt *CreateTrueFalseVals(bool WhichOne);
212 //===----------------------------------------------------------------------===//
213 /// ConstantFP - Floating Point Values [float, double]
215 class ConstantFP : public Constant {
217 ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
219 ConstantFP(const Type *Ty, double V);
221 /// get() - Static factory methods - Return objects of the specified value
222 static ConstantFP *get(const Type *Ty, double V);
224 /// isValueValidForType - return true if Ty is big enough to represent V.
225 static bool isValueValidForType(const Type *Ty, double V);
226 inline double getValue() const { return Val; }
228 /// isNullValue - Return true if this is the value that would be returned by
229 /// getNullValue. Don't depend on == for doubles to tell us it's zero, it
230 /// considers -0.0 to be null as well as 0.0. :(
231 virtual bool isNullValue() const;
233 /// isExactlyValue - We don't rely on operator== working on double values, as
234 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
235 /// As such, this method can be used to do an exact bit-for-bit comparison of
236 /// two floating point values.
237 bool isExactlyValue(double V) const;
239 /// Methods for support type inquiry through isa, cast, and dyn_cast:
240 static inline bool classof(const ConstantFP *) { return true; }
241 static bool classof(const Value *V) {
242 return V->getValueID() == ConstantFPVal;
246 //===----------------------------------------------------------------------===//
247 /// ConstantAggregateZero - All zero aggregate value
249 class ConstantAggregateZero : public Constant {
250 friend struct ConstantCreator<ConstantAggregateZero, Type, char>;
251 ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
253 explicit ConstantAggregateZero(const Type *Ty)
254 : Constant(Ty, ConstantAggregateZeroVal, 0, 0) {}
256 /// get() - static factory method for creating a null aggregate. It is
257 /// illegal to call this method with a non-aggregate type.
258 static Constant *get(const Type *Ty);
260 /// isNullValue - Return true if this is the value that would be returned by
262 virtual bool isNullValue() const { return true; }
264 virtual void destroyConstant();
266 /// Methods for support type inquiry through isa, cast, and dyn_cast:
268 static bool classof(const ConstantAggregateZero *) { return true; }
269 static bool classof(const Value *V) {
270 return V->getValueID() == ConstantAggregateZeroVal;
275 //===----------------------------------------------------------------------===//
276 /// ConstantArray - Constant Array Declarations
278 class ConstantArray : public Constant {
279 friend struct ConstantCreator<ConstantArray, ArrayType,
280 std::vector<Constant*> >;
281 ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
283 ConstantArray(const ArrayType *T, const std::vector<Constant*> &Val);
286 /// get() - Static factory methods - Return objects of the specified value
287 static Constant *get(const ArrayType *T, const std::vector<Constant*> &);
288 static Constant *get(const ArrayType *T,
289 Constant*const*Vals, unsigned NumVals) {
290 // FIXME: make this the primary ctor method.
291 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
294 /// This method constructs a ConstantArray and initializes it with a text
295 /// string. The default behavior (AddNull==true) causes a null terminator to
296 /// be placed at the end of the array. This effectively increases the length
297 /// of the array by one (you've been warned). However, in some situations
298 /// this is not desired so if AddNull==false then the string is copied without
299 /// null termination.
300 static Constant *get(const std::string &Initializer, bool AddNull = true);
302 /// getType - Specialize the getType() method to always return an ArrayType,
303 /// which reduces the amount of casting needed in parts of the compiler.
305 inline const ArrayType *getType() const {
306 return reinterpret_cast<const ArrayType*>(Value::getType());
309 /// isString - This method returns true if the array is an array of sbyte or
310 /// ubyte, and if the elements of the array are all ConstantInt's.
311 bool isString() const;
313 /// isCString - This method returns true if the array is a string (see
315 /// isString) and it ends in a null byte \0 and does not contains any other
317 /// null bytes except its terminator.
318 bool isCString() const;
320 /// getAsString - If this array is isString(), then this method converts the
321 /// array to an std::string and returns it. Otherwise, it asserts out.
323 std::string getAsString() const;
325 /// isNullValue - Return true if this is the value that would be returned by
326 /// getNullValue. This always returns false because zero arrays are always
327 /// created as ConstantAggregateZero objects.
328 virtual bool isNullValue() const { return false; }
330 virtual void destroyConstant();
331 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
333 /// Methods for support type inquiry through isa, cast, and dyn_cast:
334 static inline bool classof(const ConstantArray *) { return true; }
335 static bool classof(const Value *V) {
336 return V->getValueID() == ConstantArrayVal;
341 //===----------------------------------------------------------------------===//
342 // ConstantStruct - Constant Struct Declarations
344 class ConstantStruct : public Constant {
345 friend struct ConstantCreator<ConstantStruct, StructType,
346 std::vector<Constant*> >;
347 ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
349 ConstantStruct(const StructType *T, const std::vector<Constant*> &Val);
352 /// get() - Static factory methods - Return objects of the specified value
354 static Constant *get(const StructType *T, const std::vector<Constant*> &V);
355 static Constant *get(const std::vector<Constant*> &V, bool Packed = false);
356 static Constant *get(Constant*const* Vals, unsigned NumVals,
357 bool Packed = false) {
358 // FIXME: make this the primary ctor method.
359 return get(std::vector<Constant*>(Vals, Vals+NumVals), Packed);
362 /// getType() specialization - Reduce amount of casting...
364 inline const StructType *getType() const {
365 return reinterpret_cast<const StructType*>(Value::getType());
368 /// isNullValue - Return true if this is the value that would be returned by
369 /// getNullValue. This always returns false because zero structs are always
370 /// created as ConstantAggregateZero objects.
371 virtual bool isNullValue() const {
375 virtual void destroyConstant();
376 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
378 /// Methods for support type inquiry through isa, cast, and dyn_cast:
379 static inline bool classof(const ConstantStruct *) { return true; }
380 static bool classof(const Value *V) {
381 return V->getValueID() == ConstantStructVal;
385 //===----------------------------------------------------------------------===//
386 /// ConstantVector - Constant Vector Declarations
388 class ConstantVector : public Constant {
389 friend struct ConstantCreator<ConstantVector, VectorType,
390 std::vector<Constant*> >;
391 ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
393 ConstantVector(const VectorType *T, const std::vector<Constant*> &Val);
396 /// get() - Static factory methods - Return objects of the specified value
397 static Constant *get(const VectorType *T, const std::vector<Constant*> &);
398 static Constant *get(const std::vector<Constant*> &V);
399 static Constant *get(Constant*const* Vals, unsigned NumVals) {
400 // FIXME: make this the primary ctor method.
401 return get(std::vector<Constant*>(Vals, Vals+NumVals));
404 /// getType - Specialize the getType() method to always return a VectorType,
405 /// which reduces the amount of casting needed in parts of the compiler.
407 inline const VectorType *getType() const {
408 return reinterpret_cast<const VectorType*>(Value::getType());
411 /// @returns the value for a vector integer constant of the given type that
412 /// has all its bits set to true.
413 /// @brief Get the all ones value
414 static ConstantVector *getAllOnesValue(const VectorType *Ty);
416 /// isNullValue - Return true if this is the value that would be returned by
417 /// getNullValue. This always returns false because zero vectors are always
418 /// created as ConstantAggregateZero objects.
419 virtual bool isNullValue() const { return false; }
421 /// This function will return true iff every element in this vector constant
422 /// is set to all ones.
423 /// @returns true iff this constant's emements are all set to all ones.
424 /// @brief Determine if the value is all ones.
425 bool isAllOnesValue() const;
427 virtual void destroyConstant();
428 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
430 /// Methods for support type inquiry through isa, cast, and dyn_cast:
431 static inline bool classof(const ConstantVector *) { return true; }
432 static bool classof(const Value *V) {
433 return V->getValueID() == ConstantVectorVal;
437 //===----------------------------------------------------------------------===//
438 /// ConstantPointerNull - a constant pointer value that points to null
440 class ConstantPointerNull : public Constant {
441 friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
442 ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
444 explicit ConstantPointerNull(const PointerType *T)
445 : Constant(reinterpret_cast<const Type*>(T),
446 Value::ConstantPointerNullVal, 0, 0) {}
450 /// get() - Static factory methods - Return objects of the specified value
451 static ConstantPointerNull *get(const PointerType *T);
453 /// isNullValue - Return true if this is the value that would be returned by
455 virtual bool isNullValue() const { return true; }
457 virtual void destroyConstant();
459 /// getType - Specialize the getType() method to always return an PointerType,
460 /// which reduces the amount of casting needed in parts of the compiler.
462 inline const PointerType *getType() const {
463 return reinterpret_cast<const PointerType*>(Value::getType());
466 /// Methods for support type inquiry through isa, cast, and dyn_cast:
467 static inline bool classof(const ConstantPointerNull *) { return true; }
468 static bool classof(const Value *V) {
469 return V->getValueID() == ConstantPointerNullVal;
474 /// ConstantExpr - a constant value that is initialized with an expression using
475 /// other constant values.
477 /// This class uses the standard Instruction opcodes to define the various
478 /// constant expressions. The Opcode field for the ConstantExpr class is
479 /// maintained in the Value::SubclassData field.
480 class ConstantExpr : public Constant {
481 friend struct ConstantCreator<ConstantExpr,Type,
482 std::pair<unsigned, std::vector<Constant*> > >;
483 friend struct ConvertConstantType<ConstantExpr, Type>;
486 ConstantExpr(const Type *Ty, unsigned Opcode, Use *Ops, unsigned NumOps)
487 : Constant(Ty, ConstantExprVal, Ops, NumOps) {
488 // Operation type (an Instruction opcode) is stored as the SubclassData.
489 SubclassData = Opcode;
492 // These private methods are used by the type resolution code to create
493 // ConstantExprs in intermediate forms.
494 static Constant *getTy(const Type *Ty, unsigned Opcode,
495 Constant *C1, Constant *C2);
496 static Constant *getCompareTy(unsigned short pred, Constant *C1,
498 static Constant *getSelectTy(const Type *Ty,
499 Constant *C1, Constant *C2, Constant *C3);
500 static Constant *getGetElementPtrTy(const Type *Ty, Constant *C,
501 Value* const *Idxs, unsigned NumIdxs);
502 static Constant *getExtractElementTy(const Type *Ty, Constant *Val,
504 static Constant *getInsertElementTy(const Type *Ty, Constant *Val,
505 Constant *Elt, Constant *Idx);
506 static Constant *getShuffleVectorTy(const Type *Ty, Constant *V1,
507 Constant *V2, Constant *Mask);
510 // Static methods to construct a ConstantExpr of different kinds. Note that
511 // these methods may return a object that is not an instance of the
512 // ConstantExpr class, because they will attempt to fold the constant
513 // expression into something simpler if possible.
515 /// Cast constant expr
517 static Constant *getTrunc (Constant *C, const Type *Ty);
518 static Constant *getSExt (Constant *C, const Type *Ty);
519 static Constant *getZExt (Constant *C, const Type *Ty);
520 static Constant *getFPTrunc (Constant *C, const Type *Ty);
521 static Constant *getFPExtend(Constant *C, const Type *Ty);
522 static Constant *getUIToFP (Constant *C, const Type *Ty);
523 static Constant *getSIToFP (Constant *C, const Type *Ty);
524 static Constant *getFPToUI (Constant *C, const Type *Ty);
525 static Constant *getFPToSI (Constant *C, const Type *Ty);
526 static Constant *getPtrToInt(Constant *C, const Type *Ty);
527 static Constant *getIntToPtr(Constant *C, const Type *Ty);
528 static Constant *getBitCast (Constant *C, const Type *Ty);
530 // @brief Convenience function for getting one of the casting operations
531 // using a CastOps opcode.
532 static Constant *getCast(
533 unsigned ops, ///< The opcode for the conversion
534 Constant *C, ///< The constant to be converted
535 const Type *Ty ///< The type to which the constant is converted
538 // @brief Create a ZExt or BitCast cast constant expression
539 static Constant *getZExtOrBitCast(
540 Constant *C, ///< The constant to zext or bitcast
541 const Type *Ty ///< The type to zext or bitcast C to
544 // @brief Create a SExt or BitCast cast constant expression
545 static Constant *getSExtOrBitCast(
546 Constant *C, ///< The constant to sext or bitcast
547 const Type *Ty ///< The type to sext or bitcast C to
550 // @brief Create a Trunc or BitCast cast constant expression
551 static Constant *getTruncOrBitCast(
552 Constant *C, ///< The constant to trunc or bitcast
553 const Type *Ty ///< The type to trunc or bitcast C to
556 /// @brief Create a BitCast or a PtrToInt cast constant expression
557 static Constant *getPointerCast(
558 Constant *C, ///< The pointer value to be casted (operand 0)
559 const Type *Ty ///< The type to which cast should be made
562 /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
563 static Constant *getIntegerCast(
564 Constant *C, ///< The integer constant to be casted
565 const Type *Ty, ///< The integer type to cast to
566 bool isSigned ///< Whether C should be treated as signed or not
569 /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
570 static Constant *getFPCast(
571 Constant *C, ///< The integer constant to be casted
572 const Type *Ty ///< The integer type to cast to
575 /// @brief Return true if this is a convert constant expression
578 /// @brief Return true if this is a compare constant expression
579 bool isCompare() const;
581 /// Select constant expr
583 static Constant *getSelect(Constant *C, Constant *V1, Constant *V2) {
584 return getSelectTy(V1->getType(), C, V1, V2);
587 /// getSizeOf constant expr - computes the size of a type in a target
588 /// independent way (Note: the return type is a ULong).
590 static Constant *getSizeOf(const Type *Ty);
592 /// ConstantExpr::get - Return a binary or shift operator constant expression,
593 /// folding if possible.
595 static Constant *get(unsigned Opcode, Constant *C1, Constant *C2);
597 /// @brief Return an ICmp or FCmp comparison operator constant expression.
598 static Constant *getCompare(unsigned short pred, Constant *C1, Constant *C2);
600 /// ConstantExpr::get* - Return some common constants without having to
601 /// specify the full Instruction::OPCODE identifier.
603 static Constant *getNeg(Constant *C);
604 static Constant *getNot(Constant *C);
605 static Constant *getAdd(Constant *C1, Constant *C2);
606 static Constant *getSub(Constant *C1, Constant *C2);
607 static Constant *getMul(Constant *C1, Constant *C2);
608 static Constant *getUDiv(Constant *C1, Constant *C2);
609 static Constant *getSDiv(Constant *C1, Constant *C2);
610 static Constant *getFDiv(Constant *C1, Constant *C2);
611 static Constant *getURem(Constant *C1, Constant *C2); // unsigned rem
612 static Constant *getSRem(Constant *C1, Constant *C2); // signed rem
613 static Constant *getFRem(Constant *C1, Constant *C2);
614 static Constant *getAnd(Constant *C1, Constant *C2);
615 static Constant *getOr(Constant *C1, Constant *C2);
616 static Constant *getXor(Constant *C1, Constant *C2);
617 static Constant* getICmp(unsigned short pred, Constant* LHS, Constant* RHS);
618 static Constant* getFCmp(unsigned short pred, Constant* LHS, Constant* RHS);
619 static Constant *getShl(Constant *C1, Constant *C2);
620 static Constant *getLShr(Constant *C1, Constant *C2);
621 static Constant *getAShr(Constant *C1, Constant *C2);
623 /// Getelementptr form. std::vector<Value*> is only accepted for convenience:
624 /// all elements must be Constant's.
626 static Constant *getGetElementPtr(Constant *C,
627 Constant* const *IdxList, unsigned NumIdx);
628 static Constant *getGetElementPtr(Constant *C,
629 Value* const *IdxList, unsigned NumIdx);
631 static Constant *getExtractElement(Constant *Vec, Constant *Idx);
632 static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
633 static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
635 /// Floating point negation must be implemented with f(x) = -0.0 - x. This
636 /// method returns the negative zero constant for floating point or vector
637 /// floating point types; for all other types, it returns the null value.
638 static Constant *getZeroValueForNegationExpr(const Type *Ty);
640 /// isNullValue - Return true if this is the value that would be returned by
642 virtual bool isNullValue() const { return false; }
644 /// getOpcode - Return the opcode at the root of this constant expression
645 unsigned getOpcode() const { return SubclassData; }
647 /// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
648 /// not an ICMP or FCMP constant expression.
649 unsigned getPredicate() const;
651 /// getOpcodeName - Return a string representation for an opcode.
652 const char *getOpcodeName() const;
654 /// getWithOperandReplaced - Return a constant expression identical to this
655 /// one, but with the specified operand set to the specified value.
656 Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
658 /// getWithOperands - This returns the current constant expression with the
659 /// operands replaced with the specified values. The specified operands must
660 /// match count and type with the existing ones.
661 Constant *getWithOperands(const std::vector<Constant*> &Ops) const;
663 virtual void destroyConstant();
664 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
666 /// Override methods to provide more type information...
667 inline Constant *getOperand(unsigned i) {
668 return cast<Constant>(User::getOperand(i));
670 inline Constant *getOperand(unsigned i) const {
671 return const_cast<Constant*>(cast<Constant>(User::getOperand(i)));
675 /// Methods for support type inquiry through isa, cast, and dyn_cast:
676 static inline bool classof(const ConstantExpr *) { return true; }
677 static inline bool classof(const Value *V) {
678 return V->getValueID() == ConstantExprVal;
683 //===----------------------------------------------------------------------===//
684 /// UndefValue - 'undef' values are things that do not have specified contents.
685 /// These are used for a variety of purposes, including global variable
686 /// initializers and operands to instructions. 'undef' values can occur with
689 class UndefValue : public Constant {
690 friend struct ConstantCreator<UndefValue, Type, char>;
691 UndefValue(const UndefValue &); // DO NOT IMPLEMENT
693 explicit UndefValue(const Type *T) : Constant(T, UndefValueVal, 0, 0) {}
695 /// get() - Static factory methods - Return an 'undef' object of the specified
698 static UndefValue *get(const Type *T);
700 /// isNullValue - Return true if this is the value that would be returned by
702 virtual bool isNullValue() const { return false; }
704 virtual void destroyConstant();
706 /// Methods for support type inquiry through isa, cast, and dyn_cast:
707 static inline bool classof(const UndefValue *) { return true; }
708 static bool classof(const Value *V) {
709 return V->getValueID() == UndefValueVal;
713 } // End llvm namespace