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"
26 #include "llvm/ADT/APFloat.h"
35 template<class ConstantClass, class TypeClass, class ValType>
36 struct ConstantCreator;
37 template<class ConstantClass, class TypeClass>
38 struct ConvertConstantType;
40 //===----------------------------------------------------------------------===//
41 /// This is the shared class of boolean and integer constants. This class
42 /// represents both boolean and integral constants.
43 /// @brief Class for constant integers.
44 class ConstantInt : public Constant {
45 static ConstantInt *TheTrueVal, *TheFalseVal;
46 ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
47 ConstantInt(const IntegerType *Ty, const APInt& V);
50 /// Return the constant as an APInt value reference. This allows clients to
51 /// obtain a copy of the value, with all its precision in tact.
52 /// @brief Return the constant's value.
53 inline const APInt& getValue() const {
57 /// getBitWidth - Return the bitwidth of this constant.
58 unsigned getBitWidth() const { return Val.getBitWidth(); }
60 /// Return the constant as a 64-bit unsigned integer value after it
61 /// has been zero extended as appropriate for the type of this constant. Note
62 /// that this method can assert if the value does not fit in 64 bits.
64 /// @brief Return the zero extended value.
65 inline uint64_t getZExtValue() const {
66 return Val.getZExtValue();
69 /// Return the constant as a 64-bit integer value after it has been sign
70 /// sign extended as appropriate for the type of this constant. Note that
71 /// this method can assert if the value does not fit in 64 bits.
73 /// @brief Return the sign extended value.
74 inline int64_t getSExtValue() const {
75 return Val.getSExtValue();
78 /// A helper method that can be used to determine if the constant contained
79 /// within is equal to a constant. This only works for very small values,
80 /// because this is all that can be represented with all types.
81 /// @brief Determine if this constant's value is same as an unsigned char.
82 bool equalsInt(uint64_t V) const {
86 /// getTrue/getFalse - Return the singleton true/false values.
87 static inline ConstantInt *getTrue() {
88 if (TheTrueVal) return TheTrueVal;
89 return CreateTrueFalseVals(true);
91 static inline ConstantInt *getFalse() {
92 if (TheFalseVal) return TheFalseVal;
93 return CreateTrueFalseVals(false);
96 /// Return a ConstantInt with the specified value for the specified type. The
97 /// value V will be canonicalized to a an unsigned APInt. Accessing it with
98 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
99 /// signed value for the type Ty.
100 /// @brief Get a ConstantInt for a specific value.
101 static ConstantInt *get(const Type *Ty, uint64_t V, bool isSigned = false);
103 /// Return a ConstantInt with the specified value and an implied Type. The
104 /// type is the integer type that corresponds to the bit width of the value.
105 static ConstantInt *get(const APInt &V);
107 /// getType - Specialize the getType() method to always return an IntegerType,
108 /// which reduces the amount of casting needed in parts of the compiler.
110 inline const IntegerType *getType() const {
111 return reinterpret_cast<const IntegerType*>(Value::getType());
114 /// This static method returns true if the type Ty is big enough to
115 /// represent the value V. This can be used to avoid having the get method
116 /// assert when V is larger than Ty can represent. Note that there are two
117 /// versions of this method, one for unsigned and one for signed integers.
118 /// Although ConstantInt canonicalizes everything to an unsigned integer,
119 /// the signed version avoids callers having to convert a signed quantity
120 /// to the appropriate unsigned type before calling the method.
121 /// @returns true if V is a valid value for type Ty
122 /// @brief Determine if the value is in range for the given type.
123 static bool isValueValidForType(const Type *Ty, uint64_t V);
124 static bool isValueValidForType(const Type *Ty, int64_t V);
126 /// This function will return true iff this constant represents the "null"
127 /// value that would be returned by the getNullValue method.
128 /// @returns true if this is the null integer value.
129 /// @brief Determine if the value is null.
130 virtual bool isNullValue() const {
134 /// This is just a convenience method to make client code smaller for a
135 /// common code. It also correctly performs the comparison without the
136 /// potential for an assertion from getZExtValue().
137 bool isZero() const {
141 /// This is just a convenience method to make client code smaller for a
142 /// common case. It also correctly performs the comparison without the
143 /// potential for an assertion from getZExtValue().
144 /// @brief Determine if the value is one.
149 /// This function will return true iff every bit in this constant is set
151 /// @returns true iff this constant's bits are all set to true.
152 /// @brief Determine if the value is all ones.
153 bool isAllOnesValue() const {
154 return Val.isAllOnesValue();
157 /// This function will return true iff this constant represents the largest
158 /// value that may be represented by the constant's type.
159 /// @returns true iff this is the largest value that may be represented
161 /// @brief Determine if the value is maximal.
162 bool isMaxValue(bool isSigned) const {
164 return Val.isMaxSignedValue();
166 return Val.isMaxValue();
169 /// This function will return true iff this constant represents the smallest
170 /// value that may be represented by this constant's type.
171 /// @returns true if this is the smallest value that may be represented by
173 /// @brief Determine if the value is minimal.
174 bool isMinValue(bool isSigned) const {
176 return Val.isMinSignedValue();
178 return Val.isMinValue();
181 /// This function will return true iff this constant represents a value with
182 /// active bits bigger than 64 bits or a value greater than the given uint64_t
184 /// @returns true iff this constant is greater or equal to the given number.
185 /// @brief Determine if the value is greater or equal to the given number.
186 bool uge(uint64_t Num) {
187 return Val.getActiveBits() > 64 || Val.getZExtValue() >= Num;
190 /// @returns the 64-bit value of this constant if its active bits number is
191 /// not greater than 64, otherwise, just return the given uint64_t number.
192 /// @brief Get the constant's value if possible.
193 uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
194 return Val.getLimitedValue(Limit);
197 /// @returns the value for an integer constant of the given type that has all
198 /// its bits set to true.
199 /// @brief Get the all ones value
200 static ConstantInt *getAllOnesValue(const Type *Ty);
202 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
203 static inline bool classof(const ConstantInt *) { return true; }
204 static bool classof(const Value *V) {
205 return V->getValueID() == ConstantIntVal;
207 static void ResetTrueFalse() { TheTrueVal = TheFalseVal = 0; }
209 static ConstantInt *CreateTrueFalseVals(bool WhichOne);
213 //===----------------------------------------------------------------------===//
214 /// ConstantFP - Floating Point Values [float, double]
216 class ConstantFP : public Constant {
218 ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
220 ConstantFP(const Type *Ty, double V);
222 /// get() - Static factory methods - Return objects of the specified value
223 static ConstantFP *get(const Type *Ty, double V);
225 /// isValueValidForType - return true if Ty is big enough to represent V.
226 static bool isValueValidForType(const Type *Ty, double V);
227 inline double getValue() const {
228 if (&Val.getSemantics() == &APFloat::IEEEdouble)
229 return Val.convertToDouble();
230 else if (&Val.getSemantics() == &APFloat::IEEEsingle)
231 return (double)Val.convertToFloat();
236 /// isNullValue - Return true if this is the value that would be returned by
237 /// getNullValue. Don't depend on == for doubles to tell us it's zero, it
238 /// considers -0.0 to be null as well as 0.0. :(
239 virtual bool isNullValue() const;
241 /// isExactlyValue - We don't rely on operator== working on double values, as
242 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
243 /// As such, this method can be used to do an exact bit-for-bit comparison of
244 /// two floating point values.
245 bool isExactlyValue(double V) const;
247 /// Methods for support type inquiry through isa, cast, and dyn_cast:
248 static inline bool classof(const ConstantFP *) { return true; }
249 static bool classof(const Value *V) {
250 return V->getValueID() == ConstantFPVal;
254 //===----------------------------------------------------------------------===//
255 /// ConstantAggregateZero - All zero aggregate value
257 class ConstantAggregateZero : public Constant {
258 friend struct ConstantCreator<ConstantAggregateZero, Type, char>;
259 ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
261 explicit ConstantAggregateZero(const Type *Ty)
262 : Constant(Ty, ConstantAggregateZeroVal, 0, 0) {}
264 /// get() - static factory method for creating a null aggregate. It is
265 /// illegal to call this method with a non-aggregate type.
266 static Constant *get(const Type *Ty);
268 /// isNullValue - Return true if this is the value that would be returned by
270 virtual bool isNullValue() const { return true; }
272 virtual void destroyConstant();
274 /// Methods for support type inquiry through isa, cast, and dyn_cast:
276 static bool classof(const ConstantAggregateZero *) { return true; }
277 static bool classof(const Value *V) {
278 return V->getValueID() == ConstantAggregateZeroVal;
283 //===----------------------------------------------------------------------===//
284 /// ConstantArray - Constant Array Declarations
286 class ConstantArray : public Constant {
287 friend struct ConstantCreator<ConstantArray, ArrayType,
288 std::vector<Constant*> >;
289 ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
291 ConstantArray(const ArrayType *T, const std::vector<Constant*> &Val);
294 /// get() - Static factory methods - Return objects of the specified value
295 static Constant *get(const ArrayType *T, const std::vector<Constant*> &);
296 static Constant *get(const ArrayType *T,
297 Constant*const*Vals, unsigned NumVals) {
298 // FIXME: make this the primary ctor method.
299 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
302 /// This method constructs a ConstantArray and initializes it with a text
303 /// string. The default behavior (AddNull==true) causes a null terminator to
304 /// be placed at the end of the array. This effectively increases the length
305 /// of the array by one (you've been warned). However, in some situations
306 /// this is not desired so if AddNull==false then the string is copied without
307 /// null termination.
308 static Constant *get(const std::string &Initializer, bool AddNull = true);
310 /// getType - Specialize the getType() method to always return an ArrayType,
311 /// which reduces the amount of casting needed in parts of the compiler.
313 inline const ArrayType *getType() const {
314 return reinterpret_cast<const ArrayType*>(Value::getType());
317 /// isString - This method returns true if the array is an array of sbyte or
318 /// ubyte, and if the elements of the array are all ConstantInt's.
319 bool isString() const;
321 /// isCString - This method returns true if the array is a string (see
323 /// isString) and it ends in a null byte \0 and does not contains any other
325 /// null bytes except its terminator.
326 bool isCString() const;
328 /// getAsString - If this array is isString(), then this method converts the
329 /// array to an std::string and returns it. Otherwise, it asserts out.
331 std::string getAsString() const;
333 /// isNullValue - Return true if this is the value that would be returned by
334 /// getNullValue. This always returns false because zero arrays are always
335 /// created as ConstantAggregateZero objects.
336 virtual bool isNullValue() const { return false; }
338 virtual void destroyConstant();
339 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
341 /// Methods for support type inquiry through isa, cast, and dyn_cast:
342 static inline bool classof(const ConstantArray *) { return true; }
343 static bool classof(const Value *V) {
344 return V->getValueID() == ConstantArrayVal;
349 //===----------------------------------------------------------------------===//
350 // ConstantStruct - Constant Struct Declarations
352 class ConstantStruct : public Constant {
353 friend struct ConstantCreator<ConstantStruct, StructType,
354 std::vector<Constant*> >;
355 ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
357 ConstantStruct(const StructType *T, const std::vector<Constant*> &Val);
360 /// get() - Static factory methods - Return objects of the specified value
362 static Constant *get(const StructType *T, const std::vector<Constant*> &V);
363 static Constant *get(const std::vector<Constant*> &V, bool Packed = false);
364 static Constant *get(Constant*const* Vals, unsigned NumVals,
365 bool Packed = false) {
366 // FIXME: make this the primary ctor method.
367 return get(std::vector<Constant*>(Vals, Vals+NumVals), Packed);
370 /// getType() specialization - Reduce amount of casting...
372 inline const StructType *getType() const {
373 return reinterpret_cast<const StructType*>(Value::getType());
376 /// isNullValue - Return true if this is the value that would be returned by
377 /// getNullValue. This always returns false because zero structs are always
378 /// created as ConstantAggregateZero objects.
379 virtual bool isNullValue() const {
383 virtual void destroyConstant();
384 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
386 /// Methods for support type inquiry through isa, cast, and dyn_cast:
387 static inline bool classof(const ConstantStruct *) { return true; }
388 static bool classof(const Value *V) {
389 return V->getValueID() == ConstantStructVal;
393 //===----------------------------------------------------------------------===//
394 /// ConstantVector - Constant Vector Declarations
396 class ConstantVector : public Constant {
397 friend struct ConstantCreator<ConstantVector, VectorType,
398 std::vector<Constant*> >;
399 ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
401 ConstantVector(const VectorType *T, const std::vector<Constant*> &Val);
404 /// get() - Static factory methods - Return objects of the specified value
405 static Constant *get(const VectorType *T, const std::vector<Constant*> &);
406 static Constant *get(const std::vector<Constant*> &V);
407 static Constant *get(Constant*const* Vals, unsigned NumVals) {
408 // FIXME: make this the primary ctor method.
409 return get(std::vector<Constant*>(Vals, Vals+NumVals));
412 /// getType - Specialize the getType() method to always return a VectorType,
413 /// which reduces the amount of casting needed in parts of the compiler.
415 inline const VectorType *getType() const {
416 return reinterpret_cast<const VectorType*>(Value::getType());
419 /// @returns the value for a vector integer constant of the given type that
420 /// has all its bits set to true.
421 /// @brief Get the all ones value
422 static ConstantVector *getAllOnesValue(const VectorType *Ty);
424 /// isNullValue - Return true if this is the value that would be returned by
425 /// getNullValue. This always returns false because zero vectors are always
426 /// created as ConstantAggregateZero objects.
427 virtual bool isNullValue() const { return false; }
429 /// This function will return true iff every element in this vector constant
430 /// is set to all ones.
431 /// @returns true iff this constant's emements are all set to all ones.
432 /// @brief Determine if the value is all ones.
433 bool isAllOnesValue() const;
435 virtual void destroyConstant();
436 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
438 /// Methods for support type inquiry through isa, cast, and dyn_cast:
439 static inline bool classof(const ConstantVector *) { return true; }
440 static bool classof(const Value *V) {
441 return V->getValueID() == ConstantVectorVal;
445 //===----------------------------------------------------------------------===//
446 /// ConstantPointerNull - a constant pointer value that points to null
448 class ConstantPointerNull : public Constant {
449 friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
450 ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
452 explicit ConstantPointerNull(const PointerType *T)
453 : Constant(reinterpret_cast<const Type*>(T),
454 Value::ConstantPointerNullVal, 0, 0) {}
458 /// get() - Static factory methods - Return objects of the specified value
459 static ConstantPointerNull *get(const PointerType *T);
461 /// isNullValue - Return true if this is the value that would be returned by
463 virtual bool isNullValue() const { return true; }
465 virtual void destroyConstant();
467 /// getType - Specialize the getType() method to always return an PointerType,
468 /// which reduces the amount of casting needed in parts of the compiler.
470 inline const PointerType *getType() const {
471 return reinterpret_cast<const PointerType*>(Value::getType());
474 /// Methods for support type inquiry through isa, cast, and dyn_cast:
475 static inline bool classof(const ConstantPointerNull *) { return true; }
476 static bool classof(const Value *V) {
477 return V->getValueID() == ConstantPointerNullVal;
482 /// ConstantExpr - a constant value that is initialized with an expression using
483 /// other constant values.
485 /// This class uses the standard Instruction opcodes to define the various
486 /// constant expressions. The Opcode field for the ConstantExpr class is
487 /// maintained in the Value::SubclassData field.
488 class ConstantExpr : public Constant {
489 friend struct ConstantCreator<ConstantExpr,Type,
490 std::pair<unsigned, std::vector<Constant*> > >;
491 friend struct ConvertConstantType<ConstantExpr, Type>;
494 ConstantExpr(const Type *Ty, unsigned Opcode, Use *Ops, unsigned NumOps)
495 : Constant(Ty, ConstantExprVal, Ops, NumOps) {
496 // Operation type (an Instruction opcode) is stored as the SubclassData.
497 SubclassData = Opcode;
500 // These private methods are used by the type resolution code to create
501 // ConstantExprs in intermediate forms.
502 static Constant *getTy(const Type *Ty, unsigned Opcode,
503 Constant *C1, Constant *C2);
504 static Constant *getCompareTy(unsigned short pred, Constant *C1,
506 static Constant *getSelectTy(const Type *Ty,
507 Constant *C1, Constant *C2, Constant *C3);
508 static Constant *getGetElementPtrTy(const Type *Ty, Constant *C,
509 Value* const *Idxs, unsigned NumIdxs);
510 static Constant *getExtractElementTy(const Type *Ty, Constant *Val,
512 static Constant *getInsertElementTy(const Type *Ty, Constant *Val,
513 Constant *Elt, Constant *Idx);
514 static Constant *getShuffleVectorTy(const Type *Ty, Constant *V1,
515 Constant *V2, Constant *Mask);
518 // Static methods to construct a ConstantExpr of different kinds. Note that
519 // these methods may return a object that is not an instance of the
520 // ConstantExpr class, because they will attempt to fold the constant
521 // expression into something simpler if possible.
523 /// Cast constant expr
525 static Constant *getTrunc (Constant *C, const Type *Ty);
526 static Constant *getSExt (Constant *C, const Type *Ty);
527 static Constant *getZExt (Constant *C, const Type *Ty);
528 static Constant *getFPTrunc (Constant *C, const Type *Ty);
529 static Constant *getFPExtend(Constant *C, const Type *Ty);
530 static Constant *getUIToFP (Constant *C, const Type *Ty);
531 static Constant *getSIToFP (Constant *C, const Type *Ty);
532 static Constant *getFPToUI (Constant *C, const Type *Ty);
533 static Constant *getFPToSI (Constant *C, const Type *Ty);
534 static Constant *getPtrToInt(Constant *C, const Type *Ty);
535 static Constant *getIntToPtr(Constant *C, const Type *Ty);
536 static Constant *getBitCast (Constant *C, const Type *Ty);
538 // @brief Convenience function for getting one of the casting operations
539 // using a CastOps opcode.
540 static Constant *getCast(
541 unsigned ops, ///< The opcode for the conversion
542 Constant *C, ///< The constant to be converted
543 const Type *Ty ///< The type to which the constant is converted
546 // @brief Create a ZExt or BitCast cast constant expression
547 static Constant *getZExtOrBitCast(
548 Constant *C, ///< The constant to zext or bitcast
549 const Type *Ty ///< The type to zext or bitcast C to
552 // @brief Create a SExt or BitCast cast constant expression
553 static Constant *getSExtOrBitCast(
554 Constant *C, ///< The constant to sext or bitcast
555 const Type *Ty ///< The type to sext or bitcast C to
558 // @brief Create a Trunc or BitCast cast constant expression
559 static Constant *getTruncOrBitCast(
560 Constant *C, ///< The constant to trunc or bitcast
561 const Type *Ty ///< The type to trunc or bitcast C to
564 /// @brief Create a BitCast or a PtrToInt cast constant expression
565 static Constant *getPointerCast(
566 Constant *C, ///< The pointer value to be casted (operand 0)
567 const Type *Ty ///< The type to which cast should be made
570 /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
571 static Constant *getIntegerCast(
572 Constant *C, ///< The integer constant to be casted
573 const Type *Ty, ///< The integer type to cast to
574 bool isSigned ///< Whether C should be treated as signed or not
577 /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
578 static Constant *getFPCast(
579 Constant *C, ///< The integer constant to be casted
580 const Type *Ty ///< The integer type to cast to
583 /// @brief Return true if this is a convert constant expression
586 /// @brief Return true if this is a compare constant expression
587 bool isCompare() const;
589 /// Select constant expr
591 static Constant *getSelect(Constant *C, Constant *V1, Constant *V2) {
592 return getSelectTy(V1->getType(), C, V1, V2);
595 /// getSizeOf constant expr - computes the size of a type in a target
596 /// independent way (Note: the return type is a ULong).
598 static Constant *getSizeOf(const Type *Ty);
600 /// ConstantExpr::get - Return a binary or shift operator constant expression,
601 /// folding if possible.
603 static Constant *get(unsigned Opcode, Constant *C1, Constant *C2);
605 /// @brief Return an ICmp or FCmp comparison operator constant expression.
606 static Constant *getCompare(unsigned short pred, Constant *C1, Constant *C2);
608 /// ConstantExpr::get* - Return some common constants without having to
609 /// specify the full Instruction::OPCODE identifier.
611 static Constant *getNeg(Constant *C);
612 static Constant *getNot(Constant *C);
613 static Constant *getAdd(Constant *C1, Constant *C2);
614 static Constant *getSub(Constant *C1, Constant *C2);
615 static Constant *getMul(Constant *C1, Constant *C2);
616 static Constant *getUDiv(Constant *C1, Constant *C2);
617 static Constant *getSDiv(Constant *C1, Constant *C2);
618 static Constant *getFDiv(Constant *C1, Constant *C2);
619 static Constant *getURem(Constant *C1, Constant *C2); // unsigned rem
620 static Constant *getSRem(Constant *C1, Constant *C2); // signed rem
621 static Constant *getFRem(Constant *C1, Constant *C2);
622 static Constant *getAnd(Constant *C1, Constant *C2);
623 static Constant *getOr(Constant *C1, Constant *C2);
624 static Constant *getXor(Constant *C1, Constant *C2);
625 static Constant* getICmp(unsigned short pred, Constant* LHS, Constant* RHS);
626 static Constant* getFCmp(unsigned short pred, Constant* LHS, Constant* RHS);
627 static Constant *getShl(Constant *C1, Constant *C2);
628 static Constant *getLShr(Constant *C1, Constant *C2);
629 static Constant *getAShr(Constant *C1, Constant *C2);
631 /// Getelementptr form. std::vector<Value*> is only accepted for convenience:
632 /// all elements must be Constant's.
634 static Constant *getGetElementPtr(Constant *C,
635 Constant* const *IdxList, unsigned NumIdx);
636 static Constant *getGetElementPtr(Constant *C,
637 Value* const *IdxList, unsigned NumIdx);
639 static Constant *getExtractElement(Constant *Vec, Constant *Idx);
640 static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
641 static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
643 /// Floating point negation must be implemented with f(x) = -0.0 - x. This
644 /// method returns the negative zero constant for floating point or vector
645 /// floating point types; for all other types, it returns the null value.
646 static Constant *getZeroValueForNegationExpr(const Type *Ty);
648 /// isNullValue - Return true if this is the value that would be returned by
650 virtual bool isNullValue() const { return false; }
652 /// getOpcode - Return the opcode at the root of this constant expression
653 unsigned getOpcode() const { return SubclassData; }
655 /// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
656 /// not an ICMP or FCMP constant expression.
657 unsigned getPredicate() const;
659 /// getOpcodeName - Return a string representation for an opcode.
660 const char *getOpcodeName() const;
662 /// getWithOperandReplaced - Return a constant expression identical to this
663 /// one, but with the specified operand set to the specified value.
664 Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
666 /// getWithOperands - This returns the current constant expression with the
667 /// operands replaced with the specified values. The specified operands must
668 /// match count and type with the existing ones.
669 Constant *getWithOperands(const std::vector<Constant*> &Ops) const;
671 virtual void destroyConstant();
672 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
674 /// Override methods to provide more type information...
675 inline Constant *getOperand(unsigned i) {
676 return cast<Constant>(User::getOperand(i));
678 inline Constant *getOperand(unsigned i) const {
679 return const_cast<Constant*>(cast<Constant>(User::getOperand(i)));
683 /// Methods for support type inquiry through isa, cast, and dyn_cast:
684 static inline bool classof(const ConstantExpr *) { return true; }
685 static inline bool classof(const Value *V) {
686 return V->getValueID() == ConstantExprVal;
691 //===----------------------------------------------------------------------===//
692 /// UndefValue - 'undef' values are things that do not have specified contents.
693 /// These are used for a variety of purposes, including global variable
694 /// initializers and operands to instructions. 'undef' values can occur with
697 class UndefValue : public Constant {
698 friend struct ConstantCreator<UndefValue, Type, char>;
699 UndefValue(const UndefValue &); // DO NOT IMPLEMENT
701 explicit UndefValue(const Type *T) : Constant(T, UndefValueVal, 0, 0) {}
703 /// get() - Static factory methods - Return an 'undef' object of the specified
706 static UndefValue *get(const Type *T);
708 /// isNullValue - Return true if this is the value that would be returned by
710 virtual bool isNullValue() const { return false; }
712 virtual void destroyConstant();
714 /// Methods for support type inquiry through isa, cast, and dyn_cast:
715 static inline bool classof(const UndefValue *) { return true; }
716 static bool classof(const Value *V) {
717 return V->getValueID() == UndefValueVal;
721 } // End llvm namespace