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 static ConstantInt* getTrue(LLVMContext &Context);
60 static ConstantInt* getFalse(LLVMContext &Context);
62 /// If Ty is a vector type, return a Constant with a splat of the given
63 /// value. Otherwise return a ConstantInt for the given value.
64 static Constant* get(const Type* Ty, uint64_t V, bool isSigned = false);
66 /// Return a ConstantInt with the specified integer value for the specified
67 /// type. If the type is wider than 64 bits, the value will be zero-extended
68 /// to fit the type, unless isSigned is true, in which case the value will
69 /// be interpreted as a 64-bit signed integer and sign-extended to fit
71 /// @brief Get a ConstantInt for a specific value.
72 static ConstantInt* get(const IntegerType* Ty, uint64_t V,
73 bool isSigned = false);
75 /// Return a ConstantInt with the specified value for the specified type. The
76 /// value V will be canonicalized to a an unsigned APInt. Accessing it with
77 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
78 /// signed value for the type Ty.
79 /// @brief Get a ConstantInt for a specific signed value.
80 static ConstantInt* getSigned(const IntegerType* Ty, int64_t V);
81 static Constant *getSigned(const Type *Ty, int64_t V);
83 /// Return a ConstantInt with the specified value and an implied Type. The
84 /// type is the integer type that corresponds to the bit width of the value.
85 static ConstantInt* get(LLVMContext &Context, const APInt& V);
87 /// Return a ConstantInt constructed from the string strStart with the given
89 static ConstantInt* get(const IntegerType* Ty, const StringRef& Str,
92 /// If Ty is a vector type, return a Constant with a splat of the given
93 /// value. Otherwise return a ConstantInt for the given value.
94 static Constant* get(const Type* Ty, const APInt& V);
96 /// Return the constant as an APInt value reference. This allows clients to
97 /// obtain a copy of the value, with all its precision in tact.
98 /// @brief Return the constant's value.
99 inline const APInt& getValue() const {
103 /// getBitWidth - Return the bitwidth of this constant.
104 unsigned getBitWidth() const { return Val.getBitWidth(); }
106 /// Return the constant as a 64-bit unsigned integer value after it
107 /// has been zero extended as appropriate for the type of this constant. Note
108 /// that this method can assert if the value does not fit in 64 bits.
110 /// @brief Return the zero extended value.
111 inline uint64_t getZExtValue() const {
112 return Val.getZExtValue();
115 /// Return the constant as a 64-bit integer value after it has been sign
116 /// extended as appropriate for the type of this constant. Note that
117 /// this method can assert if the value does not fit in 64 bits.
119 /// @brief Return the sign extended value.
120 inline int64_t getSExtValue() const {
121 return Val.getSExtValue();
124 /// A helper method that can be used to determine if the constant contained
125 /// within is equal to a constant. This only works for very small values,
126 /// because this is all that can be represented with all types.
127 /// @brief Determine if this constant's value is same as an unsigned char.
128 bool equalsInt(uint64_t V) const {
132 /// getType - Specialize the getType() method to always return an IntegerType,
133 /// which reduces the amount of casting needed in parts of the compiler.
135 inline const IntegerType *getType() const {
136 return reinterpret_cast<const IntegerType*>(Value::getType());
139 /// This static method returns true if the type Ty is big enough to
140 /// represent the value V. This can be used to avoid having the get method
141 /// assert when V is larger than Ty can represent. Note that there are two
142 /// versions of this method, one for unsigned and one for signed integers.
143 /// Although ConstantInt canonicalizes everything to an unsigned integer,
144 /// the signed version avoids callers having to convert a signed quantity
145 /// to the appropriate unsigned type before calling the method.
146 /// @returns true if V is a valid value for type Ty
147 /// @brief Determine if the value is in range for the given type.
148 static bool isValueValidForType(const Type *Ty, uint64_t V);
149 static bool isValueValidForType(const Type *Ty, int64_t V);
151 /// This function will return true iff this constant represents the "null"
152 /// value that would be returned by the getNullValue method.
153 /// @returns true if this is the null integer value.
154 /// @brief Determine if the value is null.
155 virtual bool isNullValue() const {
159 /// This is just a convenience method to make client code smaller for a
160 /// common code. It also correctly performs the comparison without the
161 /// potential for an assertion from getZExtValue().
162 bool isZero() const {
166 /// This is just a convenience method to make client code smaller for a
167 /// common case. It also correctly performs the comparison without the
168 /// potential for an assertion from getZExtValue().
169 /// @brief Determine if the value is one.
174 /// This function will return true iff every bit in this constant is set
176 /// @returns true iff this constant's bits are all set to true.
177 /// @brief Determine if the value is all ones.
178 bool isAllOnesValue() const {
179 return Val.isAllOnesValue();
182 /// This function will return true iff this constant represents the largest
183 /// value that may be represented by the constant's type.
184 /// @returns true iff this is the largest value that may be represented
186 /// @brief Determine if the value is maximal.
187 bool isMaxValue(bool isSigned) const {
189 return Val.isMaxSignedValue();
191 return Val.isMaxValue();
194 /// This function will return true iff this constant represents the smallest
195 /// value that may be represented by this constant's type.
196 /// @returns true if this is the smallest value that may be represented by
198 /// @brief Determine if the value is minimal.
199 bool isMinValue(bool isSigned) const {
201 return Val.isMinSignedValue();
203 return Val.isMinValue();
206 /// This function will return true iff this constant represents a value with
207 /// active bits bigger than 64 bits or a value greater than the given uint64_t
209 /// @returns true iff this constant is greater or equal to the given number.
210 /// @brief Determine if the value is greater or equal to the given number.
211 bool uge(uint64_t Num) {
212 return Val.getActiveBits() > 64 || Val.getZExtValue() >= Num;
215 /// getLimitedValue - If the value is smaller than the specified limit,
216 /// return it, otherwise return the limit value. This causes the value
217 /// to saturate to the limit.
218 /// @returns the min of the value of the constant and the specified value
219 /// @brief Get the constant's value with a saturation limit
220 uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
221 return Val.getLimitedValue(Limit);
224 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
225 static inline bool classof(const ConstantInt *) { return true; }
226 static bool classof(const Value *V) {
227 return V->getValueID() == ConstantIntVal;
232 //===----------------------------------------------------------------------===//
233 /// ConstantFP - Floating Point Values [float, double]
235 class ConstantFP : public Constant {
237 void *operator new(size_t, unsigned);// DO NOT IMPLEMENT
238 ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
239 friend class LLVMContextImpl;
241 ConstantFP(const Type *Ty, const APFloat& V);
243 // allocate space for exactly zero operands
244 void *operator new(size_t s) {
245 return User::operator new(s, 0);
248 /// Floating point negation must be implemented with f(x) = -0.0 - x. This
249 /// method returns the negative zero constant for floating point or vector
250 /// floating point types; for all other types, it returns the null value.
251 static Constant* getZeroValueForNegation(const Type* Ty);
253 /// get() - This returns a ConstantFP, or a vector containing a splat of a
254 /// ConstantFP, for the specified value in the specified type. This should
255 /// only be used for simple constant values like 2.0/1.0 etc, that are
256 /// known-valid both as host double and as the target format.
257 static Constant* get(const Type* Ty, double V);
258 static Constant* get(const Type* Ty, const StringRef& Str);
259 static ConstantFP* get(LLVMContext &Context, const APFloat& V);
260 static ConstantFP* getNegativeZero(const Type* Ty);
261 static ConstantFP* getInfinity(const Type* Ty, bool negative = false);
263 /// isValueValidForType - return true if Ty is big enough to represent V.
264 static bool isValueValidForType(const Type *Ty, const APFloat& V);
265 inline const APFloat& getValueAPF() const { return Val; }
267 /// isNullValue - Return true if this is the value that would be returned by
268 /// getNullValue. Don't depend on == for doubles to tell us it's zero, it
269 /// considers -0.0 to be null as well as 0.0. :(
270 virtual bool isNullValue() const;
272 /// isNegativeZeroValue - Return true if the value is what would be returned
273 /// by getZeroValueForNegation.
274 virtual bool isNegativeZeroValue() const {
275 return Val.isZero() && Val.isNegative();
278 /// isExactlyValue - We don't rely on operator== working on double values, as
279 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
280 /// As such, this method can be used to do an exact bit-for-bit comparison of
281 /// two floating point values. The version with a double operand is retained
282 /// because it's so convenient to write isExactlyValue(2.0), but please use
283 /// it only for simple constants.
284 bool isExactlyValue(const APFloat& V) const;
286 bool isExactlyValue(double V) const {
288 // convert is not supported on this type
289 if (&Val.getSemantics() == &APFloat::PPCDoubleDouble)
292 FV.convert(Val.getSemantics(), APFloat::rmNearestTiesToEven, &ignored);
293 return isExactlyValue(FV);
295 /// Methods for support type inquiry through isa, cast, and dyn_cast:
296 static inline bool classof(const ConstantFP *) { return true; }
297 static bool classof(const Value *V) {
298 return V->getValueID() == ConstantFPVal;
302 //===----------------------------------------------------------------------===//
303 /// ConstantAggregateZero - All zero aggregate value
305 class ConstantAggregateZero : public Constant {
306 friend struct ConstantCreator<ConstantAggregateZero, Type, char>;
307 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
308 ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
310 explicit ConstantAggregateZero(const Type *ty)
311 : Constant(ty, ConstantAggregateZeroVal, 0, 0) {}
313 // allocate space for exactly zero operands
314 void *operator new(size_t s) {
315 return User::operator new(s, 0);
318 static ConstantAggregateZero* get(const Type* Ty);
320 /// isNullValue - Return true if this is the value that would be returned by
322 virtual bool isNullValue() const { return true; }
324 virtual void destroyConstant();
326 /// Methods for support type inquiry through isa, cast, and dyn_cast:
328 static bool classof(const ConstantAggregateZero *) { return true; }
329 static bool classof(const Value *V) {
330 return V->getValueID() == ConstantAggregateZeroVal;
335 //===----------------------------------------------------------------------===//
336 /// ConstantArray - Constant Array Declarations
338 class ConstantArray : public Constant {
339 friend struct ConstantCreator<ConstantArray, ArrayType,
340 std::vector<Constant*> >;
341 ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
343 ConstantArray(const ArrayType *T, const std::vector<Constant*> &Val);
345 // ConstantArray accessors
346 static Constant* get(const ArrayType* T, const std::vector<Constant*>& V);
347 static Constant* get(const ArrayType* T, Constant* const* Vals,
350 /// This method constructs a ConstantArray and initializes it with a text
351 /// string. The default behavior (AddNull==true) causes a null terminator to
352 /// be placed at the end of the array. This effectively increases the length
353 /// of the array by one (you've been warned). However, in some situations
354 /// this is not desired so if AddNull==false then the string is copied without
355 /// null termination.
356 static Constant* get(LLVMContext &Context, const StringRef &Initializer,
357 bool AddNull = true);
359 /// Transparently provide more efficient getOperand methods.
360 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
362 /// getType - Specialize the getType() method to always return an ArrayType,
363 /// which reduces the amount of casting needed in parts of the compiler.
365 inline const ArrayType *getType() const {
366 return reinterpret_cast<const ArrayType*>(Value::getType());
369 /// isString - This method returns true if the array is an array of i8 and
370 /// the elements of the array are all ConstantInt's.
371 bool isString() const;
373 /// isCString - This method returns true if the array is a string (see
375 /// isString) and it ends in a null byte \0 and does not contains any other
377 /// null bytes except its terminator.
378 bool isCString() const;
380 /// getAsString - If this array is isString(), then this method converts the
381 /// array to an std::string and returns it. Otherwise, it asserts out.
383 std::string getAsString() const;
385 /// isNullValue - Return true if this is the value that would be returned by
386 /// getNullValue. This always returns false because zero arrays are always
387 /// created as ConstantAggregateZero objects.
388 virtual bool isNullValue() const { return false; }
390 virtual void destroyConstant();
391 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
393 /// Methods for support type inquiry through isa, cast, and dyn_cast:
394 static inline bool classof(const ConstantArray *) { return true; }
395 static bool classof(const Value *V) {
396 return V->getValueID() == ConstantArrayVal;
401 struct OperandTraits<ConstantArray> : public VariadicOperandTraits<> {
404 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantArray, Constant)
406 //===----------------------------------------------------------------------===//
407 // ConstantStruct - Constant Struct Declarations
409 class ConstantStruct : public Constant {
410 friend struct ConstantCreator<ConstantStruct, StructType,
411 std::vector<Constant*> >;
412 ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
414 ConstantStruct(const StructType *T, const std::vector<Constant*> &Val);
416 // ConstantStruct accessors
417 static Constant* get(const StructType* T, const std::vector<Constant*>& V);
418 static Constant* get(LLVMContext &Context,
419 const std::vector<Constant*>& V, bool Packed);
420 static Constant* get(LLVMContext &Context,
421 Constant* const *Vals, unsigned NumVals,
424 /// Transparently provide more efficient getOperand methods.
425 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
427 /// getType() specialization - Reduce amount of casting...
429 inline const StructType *getType() const {
430 return reinterpret_cast<const StructType*>(Value::getType());
433 /// isNullValue - Return true if this is the value that would be returned by
434 /// getNullValue. This always returns false because zero structs are always
435 /// created as ConstantAggregateZero objects.
436 virtual bool isNullValue() const {
440 virtual void destroyConstant();
441 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
443 /// Methods for support type inquiry through isa, cast, and dyn_cast:
444 static inline bool classof(const ConstantStruct *) { return true; }
445 static bool classof(const Value *V) {
446 return V->getValueID() == ConstantStructVal;
451 struct OperandTraits<ConstantStruct> : public VariadicOperandTraits<> {
454 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantStruct, Constant)
456 //===----------------------------------------------------------------------===//
457 /// ConstantVector - Constant Vector Declarations
459 class ConstantVector : public Constant {
460 friend struct ConstantCreator<ConstantVector, VectorType,
461 std::vector<Constant*> >;
462 ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
464 ConstantVector(const VectorType *T, const std::vector<Constant*> &Val);
466 // ConstantVector accessors
467 static Constant* get(const VectorType* T, const std::vector<Constant*>& V);
468 static Constant* get(const std::vector<Constant*>& V);
469 static Constant* get(Constant* const* Vals, unsigned NumVals);
471 /// Transparently provide more efficient getOperand methods.
472 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
474 /// getType - Specialize the getType() method to always return a VectorType,
475 /// which reduces the amount of casting needed in parts of the compiler.
477 inline const VectorType *getType() const {
478 return reinterpret_cast<const VectorType*>(Value::getType());
481 /// isNullValue - Return true if this is the value that would be returned by
482 /// getNullValue. This always returns false because zero vectors are always
483 /// created as ConstantAggregateZero objects.
484 virtual bool isNullValue() const { return false; }
486 /// This function will return true iff every element in this vector constant
487 /// is set to all ones.
488 /// @returns true iff this constant's emements are all set to all ones.
489 /// @brief Determine if the value is all ones.
490 bool isAllOnesValue() const;
492 /// getSplatValue - If this is a splat constant, meaning that all of the
493 /// elements have the same value, return that value. Otherwise return NULL.
494 Constant *getSplatValue();
496 virtual void destroyConstant();
497 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
499 /// Methods for support type inquiry through isa, cast, and dyn_cast:
500 static inline bool classof(const ConstantVector *) { return true; }
501 static bool classof(const Value *V) {
502 return V->getValueID() == ConstantVectorVal;
507 struct OperandTraits<ConstantVector> : public VariadicOperandTraits<> {
510 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantVector, Constant)
512 //===----------------------------------------------------------------------===//
513 /// ConstantPointerNull - a constant pointer value that points to null
515 class ConstantPointerNull : public Constant {
516 friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
517 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
518 ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
520 explicit ConstantPointerNull(const PointerType *T)
521 : Constant(reinterpret_cast<const Type*>(T),
522 Value::ConstantPointerNullVal, 0, 0) {}
525 // allocate space for exactly zero operands
526 void *operator new(size_t s) {
527 return User::operator new(s, 0);
530 /// get() - Static factory methods - Return objects of the specified value
531 static ConstantPointerNull *get(const PointerType *T);
533 /// isNullValue - Return true if this is the value that would be returned by
535 virtual bool isNullValue() const { return true; }
537 virtual void destroyConstant();
539 /// getType - Specialize the getType() method to always return an PointerType,
540 /// which reduces the amount of casting needed in parts of the compiler.
542 inline const PointerType *getType() const {
543 return reinterpret_cast<const PointerType*>(Value::getType());
546 /// Methods for support type inquiry through isa, cast, and dyn_cast:
547 static inline bool classof(const ConstantPointerNull *) { return true; }
548 static bool classof(const Value *V) {
549 return V->getValueID() == ConstantPointerNullVal;
554 /// ConstantExpr - a constant value that is initialized with an expression using
555 /// other constant values.
557 /// This class uses the standard Instruction opcodes to define the various
558 /// constant expressions. The Opcode field for the ConstantExpr class is
559 /// maintained in the Value::SubclassData field.
560 class ConstantExpr : public Constant {
561 friend struct ConstantCreator<ConstantExpr,Type,
562 std::pair<unsigned, std::vector<Constant*> > >;
563 friend struct ConvertConstantType<ConstantExpr, Type>;
566 ConstantExpr(const Type *ty, unsigned Opcode, Use *Ops, unsigned NumOps)
567 : Constant(ty, ConstantExprVal, Ops, NumOps) {
568 // Operation type (an Instruction opcode) is stored as the SubclassData.
569 SubclassData = Opcode;
572 // These private methods are used by the type resolution code to create
573 // ConstantExprs in intermediate forms.
574 static Constant *getTy(const Type *Ty, unsigned Opcode,
575 Constant *C1, Constant *C2,
577 static Constant *getCompareTy(unsigned short pred, Constant *C1,
579 static Constant *getSelectTy(const Type *Ty,
580 Constant *C1, Constant *C2, Constant *C3);
581 static Constant *getGetElementPtrTy(const Type *Ty, Constant *C,
582 Value* const *Idxs, unsigned NumIdxs);
583 static Constant *getInBoundsGetElementPtrTy(const Type *Ty, Constant *C,
586 static Constant *getExtractElementTy(const Type *Ty, Constant *Val,
588 static Constant *getInsertElementTy(const Type *Ty, Constant *Val,
589 Constant *Elt, Constant *Idx);
590 static Constant *getShuffleVectorTy(const Type *Ty, Constant *V1,
591 Constant *V2, Constant *Mask);
592 static Constant *getExtractValueTy(const Type *Ty, Constant *Agg,
593 const unsigned *Idxs, unsigned NumIdxs);
594 static Constant *getInsertValueTy(const Type *Ty, Constant *Agg,
596 const unsigned *Idxs, unsigned NumIdxs);
599 // Static methods to construct a ConstantExpr of different kinds. Note that
600 // these methods may return a object that is not an instance of the
601 // ConstantExpr class, because they will attempt to fold the constant
602 // expression into something simpler if possible.
604 /// Cast constant expr
607 /// getAlignOf constant expr - computes the alignment of a type in a target
608 /// independent way (Note: the return type is an i32; Note: assumes that i8
609 /// is byte aligned).
610 static Constant* getAlignOf(const Type* Ty);
612 /// getSizeOf constant expr - computes the size of a type in a target
613 /// independent way (Note: the return type is an i64).
615 static Constant* getSizeOf(const Type* Ty);
617 /// getOffsetOf constant expr - computes the offset of a field in a target
618 /// independent way (Note: the return type is an i64).
620 static Constant* getOffsetOf(const StructType* Ty, unsigned FieldNo);
622 static Constant* getNeg(Constant* C);
623 static Constant* getFNeg(Constant* C);
624 static Constant* getNot(Constant* C);
625 static Constant* getAdd(Constant* C1, Constant* C2);
626 static Constant* getFAdd(Constant* C1, Constant* C2);
627 static Constant* getSub(Constant* C1, Constant* C2);
628 static Constant* getFSub(Constant* C1, Constant* C2);
629 static Constant* getMul(Constant* C1, Constant* C2);
630 static Constant* getFMul(Constant* C1, Constant* C2);
631 static Constant* getUDiv(Constant* C1, Constant* C2);
632 static Constant* getSDiv(Constant* C1, Constant* C2);
633 static Constant* getFDiv(Constant* C1, Constant* C2);
634 static Constant* getURem(Constant* C1, Constant* C2);
635 static Constant* getSRem(Constant* C1, Constant* C2);
636 static Constant* getFRem(Constant* C1, Constant* C2);
637 static Constant* getAnd(Constant* C1, Constant* C2);
638 static Constant* getOr(Constant* C1, Constant* C2);
639 static Constant* getXor(Constant* C1, Constant* C2);
640 static Constant* getShl(Constant* C1, Constant* C2);
641 static Constant* getLShr(Constant* C1, Constant* C2);
642 static Constant* getAShr(Constant* C1, Constant* C2);
643 static Constant *getTrunc (Constant *C, const Type *Ty);
644 static Constant *getSExt (Constant *C, const Type *Ty);
645 static Constant *getZExt (Constant *C, const Type *Ty);
646 static Constant *getFPTrunc (Constant *C, const Type *Ty);
647 static Constant *getFPExtend(Constant *C, const Type *Ty);
648 static Constant *getUIToFP (Constant *C, const Type *Ty);
649 static Constant *getSIToFP (Constant *C, const Type *Ty);
650 static Constant *getFPToUI (Constant *C, const Type *Ty);
651 static Constant *getFPToSI (Constant *C, const Type *Ty);
652 static Constant *getPtrToInt(Constant *C, const Type *Ty);
653 static Constant *getIntToPtr(Constant *C, const Type *Ty);
654 static Constant *getBitCast (Constant *C, const Type *Ty);
656 static Constant* getNSWAdd(Constant* C1, Constant* C2);
657 static Constant* getNSWSub(Constant* C1, Constant* C2);
658 static Constant* getExactSDiv(Constant* C1, Constant* C2);
660 /// Transparently provide more efficient getOperand methods.
661 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
663 // @brief Convenience function for getting one of the casting operations
664 // using a CastOps opcode.
665 static Constant *getCast(
666 unsigned ops, ///< The opcode for the conversion
667 Constant *C, ///< The constant to be converted
668 const Type *Ty ///< The type to which the constant is converted
671 // @brief Create a ZExt or BitCast cast constant expression
672 static Constant *getZExtOrBitCast(
673 Constant *C, ///< The constant to zext or bitcast
674 const Type *Ty ///< The type to zext or bitcast C to
677 // @brief Create a SExt or BitCast cast constant expression
678 static Constant *getSExtOrBitCast(
679 Constant *C, ///< The constant to sext or bitcast
680 const Type *Ty ///< The type to sext or bitcast C to
683 // @brief Create a Trunc or BitCast cast constant expression
684 static Constant *getTruncOrBitCast(
685 Constant *C, ///< The constant to trunc or bitcast
686 const Type *Ty ///< The type to trunc or bitcast C to
689 /// @brief Create a BitCast or a PtrToInt cast constant expression
690 static Constant *getPointerCast(
691 Constant *C, ///< The pointer value to be casted (operand 0)
692 const Type *Ty ///< The type to which cast should be made
695 /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
696 static Constant *getIntegerCast(
697 Constant *C, ///< The integer constant to be casted
698 const Type *Ty, ///< The integer type to cast to
699 bool isSigned ///< Whether C should be treated as signed or not
702 /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
703 static Constant *getFPCast(
704 Constant *C, ///< The integer constant to be casted
705 const Type *Ty ///< The integer type to cast to
708 /// @brief Return true if this is a convert constant expression
711 /// @brief Return true if this is a compare constant expression
712 bool isCompare() const;
714 /// @brief Return true if this is an insertvalue or extractvalue expression,
715 /// and the getIndices() method may be used.
716 bool hasIndices() const;
718 /// @brief Return true if this is a getelementptr expression and all
719 /// the index operands are compile-time known integers within the
720 /// corresponding notional static array extents. Note that this is
721 /// not equivalant to, a subset of, or a superset of the "inbounds"
723 bool isGEPWithNoNotionalOverIndexing() const;
725 /// Select constant expr
727 static Constant *getSelect(Constant *C, Constant *V1, Constant *V2) {
728 return getSelectTy(V1->getType(), C, V1, V2);
731 /// get - Return a binary or shift operator constant expression,
732 /// folding if possible.
734 static Constant *get(unsigned Opcode, Constant *C1, Constant *C2,
737 /// @brief Return an ICmp or FCmp comparison operator constant expression.
738 static Constant *getCompare(unsigned short pred, Constant *C1, Constant *C2);
740 /// get* - Return some common constants without having to
741 /// specify the full Instruction::OPCODE identifier.
743 static Constant *getICmp(unsigned short pred, Constant *LHS, Constant *RHS);
744 static Constant *getFCmp(unsigned short pred, Constant *LHS, Constant *RHS);
746 /// Getelementptr form. std::vector<Value*> is only accepted for convenience:
747 /// all elements must be Constant's.
749 static Constant *getGetElementPtr(Constant *C,
750 Constant* const *IdxList, unsigned NumIdx);
751 static Constant *getGetElementPtr(Constant *C,
752 Value* const *IdxList, unsigned NumIdx);
754 /// Create an "inbounds" getelementptr. See the documentation for the
755 /// "inbounds" flag in LangRef.html for details.
756 static Constant *getInBoundsGetElementPtr(Constant *C,
757 Constant* const *IdxList,
759 static Constant *getInBoundsGetElementPtr(Constant *C,
760 Value* const *IdxList,
763 static Constant *getExtractElement(Constant *Vec, Constant *Idx);
764 static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
765 static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
766 static Constant *getExtractValue(Constant *Agg,
767 const unsigned *IdxList, unsigned NumIdx);
768 static Constant *getInsertValue(Constant *Agg, Constant *Val,
769 const unsigned *IdxList, unsigned NumIdx);
771 /// isNullValue - Return true if this is the value that would be returned by
773 virtual bool isNullValue() const { return false; }
775 /// getOpcode - Return the opcode at the root of this constant expression
776 unsigned getOpcode() const { return SubclassData; }
778 /// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
779 /// not an ICMP or FCMP constant expression.
780 unsigned getPredicate() const;
782 /// getIndices - Assert that this is an insertvalue or exactvalue
783 /// expression and return the list of indices.
784 const SmallVector<unsigned, 4> &getIndices() const;
786 /// getOpcodeName - Return a string representation for an opcode.
787 const char *getOpcodeName() const;
789 /// getWithOperandReplaced - Return a constant expression identical to this
790 /// one, but with the specified operand set to the specified value.
791 Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
793 /// getWithOperands - This returns the current constant expression with the
794 /// operands replaced with the specified values. The specified operands must
795 /// match count and type with the existing ones.
796 Constant *getWithOperands(const std::vector<Constant*> &Ops) const {
797 return getWithOperands(&Ops[0], (unsigned)Ops.size());
799 Constant *getWithOperands(Constant* const *Ops, unsigned NumOps) const;
801 virtual void destroyConstant();
802 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
804 /// Methods for support type inquiry through isa, cast, and dyn_cast:
805 static inline bool classof(const ConstantExpr *) { return true; }
806 static inline bool classof(const Value *V) {
807 return V->getValueID() == ConstantExprVal;
812 struct OperandTraits<ConstantExpr> : public VariadicOperandTraits<1> {
815 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantExpr, Constant)
817 //===----------------------------------------------------------------------===//
818 /// UndefValue - 'undef' values are things that do not have specified contents.
819 /// These are used for a variety of purposes, including global variable
820 /// initializers and operands to instructions. 'undef' values can occur with
823 class UndefValue : public Constant {
824 friend struct ConstantCreator<UndefValue, Type, char>;
825 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
826 UndefValue(const UndefValue &); // DO NOT IMPLEMENT
828 explicit UndefValue(const Type *T) : Constant(T, UndefValueVal, 0, 0) {}
830 // allocate space for exactly zero operands
831 void *operator new(size_t s) {
832 return User::operator new(s, 0);
835 /// get() - Static factory methods - Return an 'undef' object of the specified
838 static UndefValue *get(const Type *T);
840 /// isNullValue - Return true if this is the value that would be returned by
842 virtual bool isNullValue() const { return false; }
844 virtual void destroyConstant();
846 /// Methods for support type inquiry through isa, cast, and dyn_cast:
847 static inline bool classof(const UndefValue *) { return true; }
848 static bool classof(const Value *V) {
849 return V->getValueID() == UndefValueVal;
852 } // End llvm namespace