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 //===----------------------------------------------------------------------===//
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 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
47 ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
48 ConstantInt(const IntegerType *Ty, const APInt& V);
51 // allocate space for exactly zero operands
52 void *operator new(size_t s) {
53 return User::operator new(s, 0);
56 /// Return the constant as an APInt value reference. This allows clients to
57 /// obtain a copy of the value, with all its precision in tact.
58 /// @brief Return the constant's value.
59 inline const APInt& getValue() const {
63 /// getBitWidth - Return the bitwidth of this constant.
64 unsigned getBitWidth() const { return Val.getBitWidth(); }
66 /// Return the constant as a 64-bit unsigned integer value after it
67 /// has been zero extended as appropriate for the type of this constant. Note
68 /// that this method can assert if the value does not fit in 64 bits.
70 /// @brief Return the zero extended value.
71 inline uint64_t getZExtValue() const {
72 return Val.getZExtValue();
75 /// Return the constant as a 64-bit integer value after it has been sign
76 /// sign extended as appropriate for the type of this constant. Note that
77 /// this method can assert if the value does not fit in 64 bits.
79 /// @brief Return the sign extended value.
80 inline int64_t getSExtValue() const {
81 return Val.getSExtValue();
84 /// A helper method that can be used to determine if the constant contained
85 /// within is equal to a constant. This only works for very small values,
86 /// because this is all that can be represented with all types.
87 /// @brief Determine if this constant's value is same as an unsigned char.
88 bool equalsInt(uint64_t V) const {
92 /// getTrue/getFalse - Return the singleton true/false values.
93 static inline ConstantInt *getTrue() {
94 if (TheTrueVal) return TheTrueVal;
95 return CreateTrueFalseVals(true);
97 static inline ConstantInt *getFalse() {
98 if (TheFalseVal) return TheFalseVal;
99 return CreateTrueFalseVals(false);
102 /// Return a ConstantInt with the specified value for the specified type. The
103 /// value V will be canonicalized to a an unsigned APInt. Accessing it with
104 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
105 /// signed value for the type Ty.
106 /// @brief Get a ConstantInt for a specific value.
107 static ConstantInt *get(const Type *Ty, uint64_t V, bool isSigned = false);
109 /// Return a ConstantInt with the specified value and an implied Type. The
110 /// type is the integer type that corresponds to the bit width of the value.
111 static ConstantInt *get(const APInt &V);
113 /// getType - Specialize the getType() method to always return an IntegerType,
114 /// which reduces the amount of casting needed in parts of the compiler.
116 inline const IntegerType *getType() const {
117 return reinterpret_cast<const IntegerType*>(Value::getType());
120 /// This static method returns true if the type Ty is big enough to
121 /// represent the value V. This can be used to avoid having the get method
122 /// assert when V is larger than Ty can represent. Note that there are two
123 /// versions of this method, one for unsigned and one for signed integers.
124 /// Although ConstantInt canonicalizes everything to an unsigned integer,
125 /// the signed version avoids callers having to convert a signed quantity
126 /// to the appropriate unsigned type before calling the method.
127 /// @returns true if V is a valid value for type Ty
128 /// @brief Determine if the value is in range for the given type.
129 static bool isValueValidForType(const Type *Ty, uint64_t V);
130 static bool isValueValidForType(const Type *Ty, int64_t V);
132 /// This function will return true iff this constant represents the "null"
133 /// value that would be returned by the getNullValue method.
134 /// @returns true if this is the null integer value.
135 /// @brief Determine if the value is null.
136 virtual bool isNullValue() const {
140 /// This is just a convenience method to make client code smaller for a
141 /// common code. It also correctly performs the comparison without the
142 /// potential for an assertion from getZExtValue().
143 bool isZero() const {
147 /// This is just a convenience method to make client code smaller for a
148 /// common case. It also correctly performs the comparison without the
149 /// potential for an assertion from getZExtValue().
150 /// @brief Determine if the value is one.
155 /// This function will return true iff every bit in this constant is set
157 /// @returns true iff this constant's bits are all set to true.
158 /// @brief Determine if the value is all ones.
159 bool isAllOnesValue() const {
160 return Val.isAllOnesValue();
163 /// This function will return true iff this constant represents the largest
164 /// value that may be represented by the constant's type.
165 /// @returns true iff this is the largest value that may be represented
167 /// @brief Determine if the value is maximal.
168 bool isMaxValue(bool isSigned) const {
170 return Val.isMaxSignedValue();
172 return Val.isMaxValue();
175 /// This function will return true iff this constant represents the smallest
176 /// value that may be represented by this constant's type.
177 /// @returns true if this is the smallest value that may be represented by
179 /// @brief Determine if the value is minimal.
180 bool isMinValue(bool isSigned) const {
182 return Val.isMinSignedValue();
184 return Val.isMinValue();
187 /// This function will return true iff this constant represents a value with
188 /// active bits bigger than 64 bits or a value greater than the given uint64_t
190 /// @returns true iff this constant is greater or equal to the given number.
191 /// @brief Determine if the value is greater or equal to the given number.
192 bool uge(uint64_t Num) {
193 return Val.getActiveBits() > 64 || Val.getZExtValue() >= Num;
196 /// @returns the 64-bit value of this constant if its active bits number is
197 /// not greater than 64, otherwise, just return the given uint64_t number.
198 /// @brief Get the constant's value if possible.
199 uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
200 return Val.getLimitedValue(Limit);
203 /// @returns the value for an integer constant of the given type that has all
204 /// its bits set to true.
205 /// @brief Get the all ones value
206 static ConstantInt *getAllOnesValue(const Type *Ty);
208 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
209 static inline bool classof(const ConstantInt *) { return true; }
210 static bool classof(const Value *V) {
211 return V->getValueID() == ConstantIntVal;
213 static void ResetTrueFalse() { TheTrueVal = TheFalseVal = 0; }
215 static ConstantInt *CreateTrueFalseVals(bool WhichOne);
219 //===----------------------------------------------------------------------===//
220 /// ConstantFP - Floating Point Values [float, double]
222 class ConstantFP : public Constant {
224 void *operator new(size_t, unsigned);// DO NOT IMPLEMENT
225 ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
227 ConstantFP(const Type *Ty, const APFloat& V);
229 // allocate space for exactly zero operands
230 void *operator new(size_t s) {
231 return User::operator new(s, 0);
234 /// get() - Static factory methods - Return objects of the specified value
235 static ConstantFP *get(const Type *Ty, const APFloat& V);
237 /// isValueValidForType - return true if Ty is big enough to represent V.
238 static bool isValueValidForType(const Type *Ty, const APFloat& V);
239 inline const APFloat& getValueAPF() const { return Val; }
241 /// isNullValue - Return true if this is the value that would be returned by
242 /// getNullValue. Don't depend on == for doubles to tell us it's zero, it
243 /// considers -0.0 to be null as well as 0.0. :(
244 virtual bool isNullValue() const;
246 // Get a negative zero.
247 static ConstantFP *getNegativeZero(const Type* Ty);
249 /// isExactlyValue - We don't rely on operator== working on double values, as
250 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
251 /// As such, this method can be used to do an exact bit-for-bit comparison of
252 /// two floating point values. The version with a double operand is retained
253 /// because it's so convenient to write isExactlyValue(2.0), but please use
254 /// it only for constants.
255 bool isExactlyValue(const APFloat& V) const;
257 bool isExactlyValue(double V) const {
258 if (&Val.getSemantics() == &APFloat::IEEEdouble)
259 return isExactlyValue(APFloat(V));
260 else if (&Val.getSemantics() == &APFloat::IEEEsingle)
261 return isExactlyValue(APFloat((float)V));
265 /// Methods for support type inquiry through isa, cast, and dyn_cast:
266 static inline bool classof(const ConstantFP *) { return true; }
267 static bool classof(const Value *V) {
268 return V->getValueID() == ConstantFPVal;
272 //===----------------------------------------------------------------------===//
273 /// ConstantAggregateZero - All zero aggregate value
275 class ConstantAggregateZero : public Constant {
276 friend struct ConstantCreator<ConstantAggregateZero, Type, char>;
277 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
278 ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
280 explicit ConstantAggregateZero(const Type *Ty)
281 : Constant(Ty, ConstantAggregateZeroVal, 0, 0) {}
283 // allocate space for exactly zero operands
284 void *operator new(size_t s) {
285 return User::operator new(s, 0);
288 /// get() - static factory method for creating a null aggregate. It is
289 /// illegal to call this method with a non-aggregate type.
290 static Constant *get(const Type *Ty);
292 /// isNullValue - Return true if this is the value that would be returned by
294 virtual bool isNullValue() const { return true; }
296 virtual void destroyConstant();
298 /// Methods for support type inquiry through isa, cast, and dyn_cast:
300 static bool classof(const ConstantAggregateZero *) { return true; }
301 static bool classof(const Value *V) {
302 return V->getValueID() == ConstantAggregateZeroVal;
307 //===----------------------------------------------------------------------===//
308 /// ConstantArray - Constant Array Declarations
310 class ConstantArray : public Constant {
311 friend struct ConstantCreator<ConstantArray, ArrayType,
312 std::vector<Constant*> >;
313 ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
315 ConstantArray(const ArrayType *T, const std::vector<Constant*> &Val);
318 /// get() - Static factory methods - Return objects of the specified value
319 static Constant *get(const ArrayType *T, const std::vector<Constant*> &);
320 static Constant *get(const ArrayType *T,
321 Constant*const*Vals, unsigned NumVals) {
322 // FIXME: make this the primary ctor method.
323 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
326 /// This method constructs a ConstantArray and initializes it with a text
327 /// string. The default behavior (AddNull==true) causes a null terminator to
328 /// be placed at the end of the array. This effectively increases the length
329 /// of the array by one (you've been warned). However, in some situations
330 /// this is not desired so if AddNull==false then the string is copied without
331 /// null termination.
332 static Constant *get(const std::string &Initializer, bool AddNull = true);
334 /// getType - Specialize the getType() method to always return an ArrayType,
335 /// which reduces the amount of casting needed in parts of the compiler.
337 inline const ArrayType *getType() const {
338 return reinterpret_cast<const ArrayType*>(Value::getType());
341 /// isString - This method returns true if the array is an array of i8 and
342 /// the elements of the array are all ConstantInt's.
343 bool isString() const;
345 /// isCString - This method returns true if the array is a string (see
347 /// isString) and it ends in a null byte \0 and does not contains any other
349 /// null bytes except its terminator.
350 bool isCString() const;
352 /// getAsString - If this array is isString(), then this method converts the
353 /// array to an std::string and returns it. Otherwise, it asserts out.
355 std::string getAsString() const;
357 /// isNullValue - Return true if this is the value that would be returned by
358 /// getNullValue. This always returns false because zero arrays are always
359 /// created as ConstantAggregateZero objects.
360 virtual bool isNullValue() const { return false; }
362 virtual void destroyConstant();
363 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
365 /// Methods for support type inquiry through isa, cast, and dyn_cast:
366 static inline bool classof(const ConstantArray *) { return true; }
367 static bool classof(const Value *V) {
368 return V->getValueID() == ConstantArrayVal;
373 //===----------------------------------------------------------------------===//
374 // ConstantStruct - Constant Struct Declarations
376 class ConstantStruct : public Constant {
377 friend struct ConstantCreator<ConstantStruct, StructType,
378 std::vector<Constant*> >;
379 ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
381 ConstantStruct(const StructType *T, const std::vector<Constant*> &Val);
384 /// get() - Static factory methods - Return objects of the specified value
386 static Constant *get(const StructType *T, const std::vector<Constant*> &V);
387 static Constant *get(const std::vector<Constant*> &V, bool Packed = false);
388 static Constant *get(Constant*const* Vals, unsigned NumVals,
389 bool Packed = false) {
390 // FIXME: make this the primary ctor method.
391 return get(std::vector<Constant*>(Vals, Vals+NumVals), Packed);
394 /// getType() specialization - Reduce amount of casting...
396 inline const StructType *getType() const {
397 return reinterpret_cast<const StructType*>(Value::getType());
400 /// isNullValue - Return true if this is the value that would be returned by
401 /// getNullValue. This always returns false because zero structs are always
402 /// created as ConstantAggregateZero objects.
403 virtual bool isNullValue() const {
407 virtual void destroyConstant();
408 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
410 /// Methods for support type inquiry through isa, cast, and dyn_cast:
411 static inline bool classof(const ConstantStruct *) { return true; }
412 static bool classof(const Value *V) {
413 return V->getValueID() == ConstantStructVal;
417 //===----------------------------------------------------------------------===//
418 /// ConstantVector - Constant Vector Declarations
420 class ConstantVector : public Constant {
421 friend struct ConstantCreator<ConstantVector, VectorType,
422 std::vector<Constant*> >;
423 ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
425 ConstantVector(const VectorType *T, const std::vector<Constant*> &Val);
428 /// get() - Static factory methods - Return objects of the specified value
429 static Constant *get(const VectorType *T, const std::vector<Constant*> &);
430 static Constant *get(const std::vector<Constant*> &V);
431 static Constant *get(Constant*const* Vals, unsigned NumVals) {
432 // FIXME: make this the primary ctor method.
433 return get(std::vector<Constant*>(Vals, Vals+NumVals));
436 /// getType - Specialize the getType() method to always return a VectorType,
437 /// which reduces the amount of casting needed in parts of the compiler.
439 inline const VectorType *getType() const {
440 return reinterpret_cast<const VectorType*>(Value::getType());
443 /// @returns the value for a vector integer constant of the given type that
444 /// has all its bits set to true.
445 /// @brief Get the all ones value
446 static ConstantVector *getAllOnesValue(const VectorType *Ty);
448 /// isNullValue - Return true if this is the value that would be returned by
449 /// getNullValue. This always returns false because zero vectors are always
450 /// created as ConstantAggregateZero objects.
451 virtual bool isNullValue() const { return false; }
453 /// This function will return true iff every element in this vector constant
454 /// is set to all ones.
455 /// @returns true iff this constant's emements are all set to all ones.
456 /// @brief Determine if the value is all ones.
457 bool isAllOnesValue() const;
459 /// getSplatValue - If this is a splat constant, meaning that all of the
460 /// elements have the same value, return that value. Otherwise return NULL.
461 Constant *getSplatValue();
463 virtual void destroyConstant();
464 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
466 /// Methods for support type inquiry through isa, cast, and dyn_cast:
467 static inline bool classof(const ConstantVector *) { return true; }
468 static bool classof(const Value *V) {
469 return V->getValueID() == ConstantVectorVal;
473 //===----------------------------------------------------------------------===//
474 /// ConstantPointerNull - a constant pointer value that points to null
476 class ConstantPointerNull : public Constant {
477 friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
478 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
479 ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
481 explicit ConstantPointerNull(const PointerType *T)
482 : Constant(reinterpret_cast<const Type*>(T),
483 Value::ConstantPointerNullVal, 0, 0) {}
486 // allocate space for exactly zero operands
487 void *operator new(size_t s) {
488 return User::operator new(s, 0);
491 /// get() - Static factory methods - Return objects of the specified value
492 static ConstantPointerNull *get(const PointerType *T);
494 /// isNullValue - Return true if this is the value that would be returned by
496 virtual bool isNullValue() const { return true; }
498 virtual void destroyConstant();
500 /// getType - Specialize the getType() method to always return an PointerType,
501 /// which reduces the amount of casting needed in parts of the compiler.
503 inline const PointerType *getType() const {
504 return reinterpret_cast<const PointerType*>(Value::getType());
507 /// Methods for support type inquiry through isa, cast, and dyn_cast:
508 static inline bool classof(const ConstantPointerNull *) { return true; }
509 static bool classof(const Value *V) {
510 return V->getValueID() == ConstantPointerNullVal;
515 /// ConstantExpr - a constant value that is initialized with an expression using
516 /// other constant values.
518 /// This class uses the standard Instruction opcodes to define the various
519 /// constant expressions. The Opcode field for the ConstantExpr class is
520 /// maintained in the Value::SubclassData field.
521 class ConstantExpr : public Constant {
522 friend struct ConstantCreator<ConstantExpr,Type,
523 std::pair<unsigned, std::vector<Constant*> > >;
524 friend struct ConvertConstantType<ConstantExpr, Type>;
527 ConstantExpr(const Type *Ty, unsigned Opcode, Use *Ops, unsigned NumOps)
528 : Constant(Ty, ConstantExprVal, Ops, NumOps) {
529 // Operation type (an Instruction opcode) is stored as the SubclassData.
530 SubclassData = Opcode;
533 // These private methods are used by the type resolution code to create
534 // ConstantExprs in intermediate forms.
535 static Constant *getTy(const Type *Ty, unsigned Opcode,
536 Constant *C1, Constant *C2);
537 static Constant *getCompareTy(unsigned short pred, Constant *C1,
539 static Constant *getSelectTy(const Type *Ty,
540 Constant *C1, Constant *C2, Constant *C3);
541 static Constant *getGetElementPtrTy(const Type *Ty, Constant *C,
542 Value* const *Idxs, unsigned NumIdxs);
543 static Constant *getExtractElementTy(const Type *Ty, Constant *Val,
545 static Constant *getInsertElementTy(const Type *Ty, Constant *Val,
546 Constant *Elt, Constant *Idx);
547 static Constant *getShuffleVectorTy(const Type *Ty, Constant *V1,
548 Constant *V2, Constant *Mask);
551 // Static methods to construct a ConstantExpr of different kinds. Note that
552 // these methods may return a object that is not an instance of the
553 // ConstantExpr class, because they will attempt to fold the constant
554 // expression into something simpler if possible.
556 /// Cast constant expr
558 static Constant *getTrunc (Constant *C, const Type *Ty);
559 static Constant *getSExt (Constant *C, const Type *Ty);
560 static Constant *getZExt (Constant *C, const Type *Ty);
561 static Constant *getFPTrunc (Constant *C, const Type *Ty);
562 static Constant *getFPExtend(Constant *C, const Type *Ty);
563 static Constant *getUIToFP (Constant *C, const Type *Ty);
564 static Constant *getSIToFP (Constant *C, const Type *Ty);
565 static Constant *getFPToUI (Constant *C, const Type *Ty);
566 static Constant *getFPToSI (Constant *C, const Type *Ty);
567 static Constant *getPtrToInt(Constant *C, const Type *Ty);
568 static Constant *getIntToPtr(Constant *C, const Type *Ty);
569 static Constant *getBitCast (Constant *C, const Type *Ty);
571 // @brief Convenience function for getting one of the casting operations
572 // using a CastOps opcode.
573 static Constant *getCast(
574 unsigned ops, ///< The opcode for the conversion
575 Constant *C, ///< The constant to be converted
576 const Type *Ty ///< The type to which the constant is converted
579 // @brief Create a ZExt or BitCast cast constant expression
580 static Constant *getZExtOrBitCast(
581 Constant *C, ///< The constant to zext or bitcast
582 const Type *Ty ///< The type to zext or bitcast C to
585 // @brief Create a SExt or BitCast cast constant expression
586 static Constant *getSExtOrBitCast(
587 Constant *C, ///< The constant to sext or bitcast
588 const Type *Ty ///< The type to sext or bitcast C to
591 // @brief Create a Trunc or BitCast cast constant expression
592 static Constant *getTruncOrBitCast(
593 Constant *C, ///< The constant to trunc or bitcast
594 const Type *Ty ///< The type to trunc or bitcast C to
597 /// @brief Create a BitCast or a PtrToInt cast constant expression
598 static Constant *getPointerCast(
599 Constant *C, ///< The pointer value to be casted (operand 0)
600 const Type *Ty ///< The type to which cast should be made
603 /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
604 static Constant *getIntegerCast(
605 Constant *C, ///< The integer constant to be casted
606 const Type *Ty, ///< The integer type to cast to
607 bool isSigned ///< Whether C should be treated as signed or not
610 /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
611 static Constant *getFPCast(
612 Constant *C, ///< The integer constant to be casted
613 const Type *Ty ///< The integer type to cast to
616 /// @brief Return true if this is a convert constant expression
619 /// @brief Return true if this is a compare constant expression
620 bool isCompare() const;
622 /// Select constant expr
624 static Constant *getSelect(Constant *C, Constant *V1, Constant *V2) {
625 return getSelectTy(V1->getType(), C, V1, V2);
628 /// getSizeOf constant expr - computes the size of a type in a target
629 /// independent way (Note: the return type is an i64).
631 static Constant *getSizeOf(const Type *Ty);
633 /// ConstantExpr::get - Return a binary or shift operator constant expression,
634 /// folding if possible.
636 static Constant *get(unsigned Opcode, Constant *C1, Constant *C2);
638 /// @brief Return an ICmp or FCmp comparison operator constant expression.
639 static Constant *getCompare(unsigned short pred, Constant *C1, Constant *C2);
641 /// ConstantExpr::get* - Return some common constants without having to
642 /// specify the full Instruction::OPCODE identifier.
644 static Constant *getNeg(Constant *C);
645 static Constant *getNot(Constant *C);
646 static Constant *getAdd(Constant *C1, Constant *C2);
647 static Constant *getSub(Constant *C1, Constant *C2);
648 static Constant *getMul(Constant *C1, Constant *C2);
649 static Constant *getUDiv(Constant *C1, Constant *C2);
650 static Constant *getSDiv(Constant *C1, Constant *C2);
651 static Constant *getFDiv(Constant *C1, Constant *C2);
652 static Constant *getURem(Constant *C1, Constant *C2); // unsigned rem
653 static Constant *getSRem(Constant *C1, Constant *C2); // signed rem
654 static Constant *getFRem(Constant *C1, Constant *C2);
655 static Constant *getAnd(Constant *C1, Constant *C2);
656 static Constant *getOr(Constant *C1, Constant *C2);
657 static Constant *getXor(Constant *C1, Constant *C2);
658 static Constant *getICmp(unsigned short pred, Constant *LHS, Constant *RHS);
659 static Constant *getFCmp(unsigned short pred, Constant *LHS, Constant *RHS);
660 static Constant *getShl(Constant *C1, Constant *C2);
661 static Constant *getLShr(Constant *C1, Constant *C2);
662 static Constant *getAShr(Constant *C1, Constant *C2);
664 /// Getelementptr form. std::vector<Value*> is only accepted for convenience:
665 /// all elements must be Constant's.
667 static Constant *getGetElementPtr(Constant *C,
668 Constant* const *IdxList, unsigned NumIdx);
669 static Constant *getGetElementPtr(Constant *C,
670 Value* const *IdxList, unsigned NumIdx);
672 static Constant *getExtractElement(Constant *Vec, Constant *Idx);
673 static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
674 static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
676 /// Floating point negation must be implemented with f(x) = -0.0 - x. This
677 /// method returns the negative zero constant for floating point or vector
678 /// floating point types; for all other types, it returns the null value.
679 static Constant *getZeroValueForNegationExpr(const Type *Ty);
681 /// isNullValue - Return true if this is the value that would be returned by
683 virtual bool isNullValue() const { return false; }
685 /// getOpcode - Return the opcode at the root of this constant expression
686 unsigned getOpcode() const { return SubclassData; }
688 /// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
689 /// not an ICMP or FCMP constant expression.
690 unsigned getPredicate() const;
692 /// getOpcodeName - Return a string representation for an opcode.
693 const char *getOpcodeName() const;
695 /// getWithOperandReplaced - Return a constant expression identical to this
696 /// one, but with the specified operand set to the specified value.
697 Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
699 /// getWithOperands - This returns the current constant expression with the
700 /// operands replaced with the specified values. The specified operands must
701 /// match count and type with the existing ones.
702 Constant *getWithOperands(const std::vector<Constant*> &Ops) const;
704 virtual void destroyConstant();
705 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
707 /// Override methods to provide more type information...
708 inline Constant *getOperand(unsigned i) {
709 return cast<Constant>(User::getOperand(i));
711 inline Constant *getOperand(unsigned i) const {
712 return const_cast<Constant*>(cast<Constant>(User::getOperand(i)));
716 /// Methods for support type inquiry through isa, cast, and dyn_cast:
717 static inline bool classof(const ConstantExpr *) { return true; }
718 static inline bool classof(const Value *V) {
719 return V->getValueID() == ConstantExprVal;
724 //===----------------------------------------------------------------------===//
725 /// UndefValue - 'undef' values are things that do not have specified contents.
726 /// These are used for a variety of purposes, including global variable
727 /// initializers and operands to instructions. 'undef' values can occur with
730 class UndefValue : public Constant {
731 friend struct ConstantCreator<UndefValue, Type, char>;
732 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
733 UndefValue(const UndefValue &); // DO NOT IMPLEMENT
735 explicit UndefValue(const Type *T) : Constant(T, UndefValueVal, 0, 0) {}
737 // allocate space for exactly zero operands
738 void *operator new(size_t s) {
739 return User::operator new(s, 0);
742 /// get() - Static factory methods - Return an 'undef' object of the specified
745 static UndefValue *get(const Type *T);
747 /// isNullValue - Return true if this is the value that would be returned by
749 virtual bool isNullValue() const { return false; }
751 virtual void destroyConstant();
753 /// Methods for support type inquiry through isa, cast, and dyn_cast:
754 static inline bool classof(const UndefValue *) { return true; }
755 static bool classof(const Value *V) {
756 return V->getValueID() == UndefValueVal;
760 } // End llvm namespace