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/OperandTraits.h"
26 #include "llvm/ADT/APInt.h"
27 #include "llvm/ADT/APFloat.h"
28 #include "llvm/ADT/ArrayRef.h"
39 template<class ConstantClass, class TypeClass, class ValType>
40 struct ConstantCreator;
41 template<class ConstantClass, class TypeClass>
42 struct ConvertConstantType;
44 //===----------------------------------------------------------------------===//
45 /// This is the shared class of boolean and integer constants. This class
46 /// represents both boolean and integral constants.
47 /// @brief Class for constant integers.
48 class ConstantInt : public Constant {
49 virtual void anchor();
50 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
51 ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
52 ConstantInt(IntegerType *Ty, const APInt& V);
55 // allocate space for exactly zero operands
56 void *operator new(size_t s) {
57 return User::operator new(s, 0);
60 static ConstantInt *getTrue(LLVMContext &Context);
61 static ConstantInt *getFalse(LLVMContext &Context);
62 static Constant *getTrue(Type *Ty);
63 static Constant *getFalse(Type *Ty);
65 /// If Ty is a vector type, return a Constant with a splat of the given
66 /// value. Otherwise return a ConstantInt for the given value.
67 static Constant *get(Type *Ty, uint64_t V, bool isSigned = false);
69 /// Return a ConstantInt with the specified integer value for the specified
70 /// type. If the type is wider than 64 bits, the value will be zero-extended
71 /// to fit the type, unless isSigned is true, in which case the value will
72 /// be interpreted as a 64-bit signed integer and sign-extended to fit
74 /// @brief Get a ConstantInt for a specific value.
75 static ConstantInt *get(IntegerType *Ty, uint64_t V,
76 bool isSigned = false);
78 /// Return a ConstantInt with the specified value for the specified type. The
79 /// value V will be canonicalized to a an unsigned APInt. Accessing it with
80 /// either getSExtValue() or getZExtValue() will yield a correctly sized and
81 /// signed value for the type Ty.
82 /// @brief Get a ConstantInt for a specific signed value.
83 static ConstantInt *getSigned(IntegerType *Ty, int64_t V);
84 static Constant *getSigned(Type *Ty, int64_t V);
86 /// Return a ConstantInt with the specified value and an implied Type. The
87 /// type is the integer type that corresponds to the bit width of the value.
88 static ConstantInt *get(LLVMContext &Context, const APInt &V);
90 /// Return a ConstantInt constructed from the string strStart with the given
92 static ConstantInt *get(IntegerType *Ty, StringRef Str,
95 /// If Ty is a vector type, return a Constant with a splat of the given
96 /// value. Otherwise return a ConstantInt for the given value.
97 static Constant *get(Type* Ty, const APInt& V);
99 /// Return the constant as an APInt value reference. This allows clients to
100 /// obtain a copy of the value, with all its precision in tact.
101 /// @brief Return the constant's value.
102 inline const APInt &getValue() const {
106 /// getBitWidth - Return the bitwidth of this constant.
107 unsigned getBitWidth() const { return Val.getBitWidth(); }
109 /// Return the constant as a 64-bit unsigned integer value after it
110 /// has been zero extended as appropriate for the type of this constant. Note
111 /// that this method can assert if the value does not fit in 64 bits.
113 /// @brief Return the zero extended value.
114 inline uint64_t getZExtValue() const {
115 return Val.getZExtValue();
118 /// Return the constant as a 64-bit integer value after it has been sign
119 /// extended as appropriate for the type of this constant. Note that
120 /// this method can assert if the value does not fit in 64 bits.
122 /// @brief Return the sign extended value.
123 inline int64_t getSExtValue() const {
124 return Val.getSExtValue();
127 /// A helper method that can be used to determine if the constant contained
128 /// within is equal to a constant. This only works for very small values,
129 /// because this is all that can be represented with all types.
130 /// @brief Determine if this constant's value is same as an unsigned char.
131 bool equalsInt(uint64_t V) const {
135 /// getType - Specialize the getType() method to always return an IntegerType,
136 /// which reduces the amount of casting needed in parts of the compiler.
138 inline IntegerType *getType() const {
139 return reinterpret_cast<IntegerType*>(Value::getType());
142 /// This static method returns true if the type Ty is big enough to
143 /// represent the value V. This can be used to avoid having the get method
144 /// assert when V is larger than Ty can represent. Note that there are two
145 /// versions of this method, one for unsigned and one for signed integers.
146 /// Although ConstantInt canonicalizes everything to an unsigned integer,
147 /// the signed version avoids callers having to convert a signed quantity
148 /// to the appropriate unsigned type before calling the method.
149 /// @returns true if V is a valid value for type Ty
150 /// @brief Determine if the value is in range for the given type.
151 static bool isValueValidForType(Type *Ty, uint64_t V);
152 static bool isValueValidForType(Type *Ty, int64_t V);
154 bool isNegative() const { return Val.isNegative(); }
156 /// This is just a convenience method to make client code smaller for a
157 /// common code. It also correctly performs the comparison without the
158 /// potential for an assertion from getZExtValue().
159 bool isZero() const {
163 /// This is just a convenience method to make client code smaller for a
164 /// common case. It also correctly performs the comparison without the
165 /// potential for an assertion from getZExtValue().
166 /// @brief Determine if the value is one.
171 /// This function will return true iff every bit in this constant is set
173 /// @returns true iff this constant's bits are all set to true.
174 /// @brief Determine if the value is all ones.
175 bool isMinusOne() const {
176 return Val.isAllOnesValue();
179 /// This function will return true iff this constant represents the largest
180 /// value that may be represented by the constant's type.
181 /// @returns true iff this is the largest value that may be represented
183 /// @brief Determine if the value is maximal.
184 bool isMaxValue(bool isSigned) const {
186 return Val.isMaxSignedValue();
188 return Val.isMaxValue();
191 /// This function will return true iff this constant represents the smallest
192 /// value that may be represented by this constant's type.
193 /// @returns true if this is the smallest value that may be represented by
195 /// @brief Determine if the value is minimal.
196 bool isMinValue(bool isSigned) const {
198 return Val.isMinSignedValue();
200 return Val.isMinValue();
203 /// This function will return true iff this constant represents a value with
204 /// active bits bigger than 64 bits or a value greater than the given uint64_t
206 /// @returns true iff this constant is greater or equal to the given number.
207 /// @brief Determine if the value is greater or equal to the given number.
208 bool uge(uint64_t Num) const {
209 return Val.getActiveBits() > 64 || Val.getZExtValue() >= Num;
212 /// getLimitedValue - If the value is smaller than the specified limit,
213 /// return it, otherwise return the limit value. This causes the value
214 /// to saturate to the limit.
215 /// @returns the min of the value of the constant and the specified value
216 /// @brief Get the constant's value with a saturation limit
217 uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
218 return Val.getLimitedValue(Limit);
221 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
222 static inline bool classof(const ConstantInt *) { return true; }
223 static bool classof(const Value *V) {
224 return V->getValueID() == ConstantIntVal;
229 //===----------------------------------------------------------------------===//
230 /// ConstantFP - Floating Point Values [float, double]
232 class ConstantFP : public Constant {
234 virtual void anchor();
235 void *operator new(size_t, unsigned);// DO NOT IMPLEMENT
236 ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
237 friend class LLVMContextImpl;
239 ConstantFP(Type *Ty, const APFloat& V);
241 // allocate space for exactly zero operands
242 void *operator new(size_t s) {
243 return User::operator new(s, 0);
246 /// Floating point negation must be implemented with f(x) = -0.0 - x. This
247 /// method returns the negative zero constant for floating point or vector
248 /// floating point types; for all other types, it returns the null value.
249 static Constant *getZeroValueForNegation(Type *Ty);
251 /// get() - This returns a ConstantFP, or a vector containing a splat of a
252 /// ConstantFP, for the specified value in the specified type. This should
253 /// only be used for simple constant values like 2.0/1.0 etc, that are
254 /// known-valid both as host double and as the target format.
255 static Constant *get(Type* Ty, double V);
256 static Constant *get(Type* Ty, StringRef Str);
257 static ConstantFP *get(LLVMContext &Context, const APFloat &V);
258 static ConstantFP *getNegativeZero(Type* Ty);
259 static ConstantFP *getInfinity(Type *Ty, bool Negative = false);
261 /// isValueValidForType - return true if Ty is big enough to represent V.
262 static bool isValueValidForType(Type *Ty, const APFloat &V);
263 inline const APFloat &getValueAPF() const { return Val; }
265 /// isZero - Return true if the value is positive or negative zero.
266 bool isZero() const { return Val.isZero(); }
268 /// isNegative - Return true if the sign bit is set.
269 bool isNegative() const { return Val.isNegative(); }
271 /// isNaN - Return true if the value is a NaN.
272 bool isNaN() const { return Val.isNaN(); }
274 /// isExactlyValue - We don't rely on operator== working on double values, as
275 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
276 /// As such, this method can be used to do an exact bit-for-bit comparison of
277 /// two floating point values. The version with a double operand is retained
278 /// because it's so convenient to write isExactlyValue(2.0), but please use
279 /// it only for simple constants.
280 bool isExactlyValue(const APFloat &V) const;
282 bool isExactlyValue(double V) const {
284 // convert is not supported on this type
285 if (&Val.getSemantics() == &APFloat::PPCDoubleDouble)
288 FV.convert(Val.getSemantics(), APFloat::rmNearestTiesToEven, &ignored);
289 return isExactlyValue(FV);
291 /// Methods for support type inquiry through isa, cast, and dyn_cast:
292 static inline bool classof(const ConstantFP *) { return true; }
293 static bool classof(const Value *V) {
294 return V->getValueID() == ConstantFPVal;
298 //===----------------------------------------------------------------------===//
299 /// ConstantAggregateZero - All zero aggregate value
301 class ConstantAggregateZero : public Constant {
302 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
303 ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
305 explicit ConstantAggregateZero(Type *ty)
306 : Constant(ty, ConstantAggregateZeroVal, 0, 0) {}
308 // allocate space for exactly zero operands
309 void *operator new(size_t s) {
310 return User::operator new(s, 0);
313 static ConstantAggregateZero *get(Type *Ty);
315 virtual void destroyConstant();
317 /// getSequentialElement - If this CAZ has array or vector type, return a zero
318 /// with the right element type.
319 Constant *getSequentialElement();
321 /// getStructElement - If this CAZ has struct type, return a zero with the
322 /// right element type for the specified element.
323 Constant *getStructElement(unsigned Elt);
325 /// getElementValue - Return a zero of the right value for the specified GEP
327 Constant *getElementValue(Constant *C);
329 /// getElementValue - Return a zero of the right value for the specified GEP
331 Constant *getElementValue(unsigned Idx);
333 /// Methods for support type inquiry through isa, cast, and dyn_cast:
335 static bool classof(const ConstantAggregateZero *) { return true; }
336 static bool classof(const Value *V) {
337 return V->getValueID() == ConstantAggregateZeroVal;
342 //===----------------------------------------------------------------------===//
343 /// ConstantArray - Constant Array Declarations
345 class ConstantArray : public Constant {
346 friend struct ConstantCreator<ConstantArray, ArrayType,
347 std::vector<Constant*> >;
348 ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
350 ConstantArray(ArrayType *T, ArrayRef<Constant *> Val);
352 // ConstantArray accessors
353 static Constant *get(ArrayType *T, ArrayRef<Constant*> V);
355 /// This method constructs a ConstantArray and initializes it with a text
356 /// string. The default behavior (AddNull==true) causes a null terminator to
357 /// be placed at the end of the array. This effectively increases the length
358 /// of the array by one (you've been warned). However, in some situations
359 /// this is not desired so if AddNull==false then the string is copied without
360 /// null termination.
362 // FIXME Remove this.
363 static Constant *get(LLVMContext &Context, StringRef Initializer,
364 bool AddNull = true);
366 /// Transparently provide more efficient getOperand methods.
367 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
369 /// getType - Specialize the getType() method to always return an ArrayType,
370 /// which reduces the amount of casting needed in parts of the compiler.
372 inline ArrayType *getType() const {
373 return reinterpret_cast<ArrayType*>(Value::getType());
376 // FIXME: String methods will eventually be removed.
379 /// isString - This method returns true if the array is an array of i8 and
380 /// the elements of the array are all ConstantInt's.
381 bool isString() const;
383 /// isCString - This method returns true if the array is a string (see
385 /// isString) and it ends in a null byte \0 and does not contains any other
387 /// null bytes except its terminator.
388 bool isCString() const;
390 /// getAsString - If this array is isString(), then this method converts the
391 /// array to an std::string and returns it. Otherwise, it asserts out.
393 std::string getAsString() const;
395 /// getAsCString - If this array is isCString(), then this method converts the
396 /// array (without the trailing null byte) to an std::string and returns it.
397 /// Otherwise, it asserts out.
399 std::string getAsCString() const;
401 virtual void destroyConstant();
402 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
404 /// Methods for support type inquiry through isa, cast, and dyn_cast:
405 static inline bool classof(const ConstantArray *) { return true; }
406 static bool classof(const Value *V) {
407 return V->getValueID() == ConstantArrayVal;
412 struct OperandTraits<ConstantArray> :
413 public VariadicOperandTraits<ConstantArray> {
416 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantArray, Constant)
418 //===----------------------------------------------------------------------===//
419 // ConstantStruct - Constant Struct Declarations
421 class ConstantStruct : public Constant {
422 friend struct ConstantCreator<ConstantStruct, StructType,
423 std::vector<Constant*> >;
424 ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
426 ConstantStruct(StructType *T, ArrayRef<Constant *> Val);
428 // ConstantStruct accessors
429 static Constant *get(StructType *T, ArrayRef<Constant*> V);
430 static Constant *get(StructType *T, ...) END_WITH_NULL;
432 /// getAnon - Return an anonymous struct that has the specified
433 /// elements. If the struct is possibly empty, then you must specify a
435 static Constant *getAnon(ArrayRef<Constant*> V, bool Packed = false) {
436 return get(getTypeForElements(V, Packed), V);
438 static Constant *getAnon(LLVMContext &Ctx,
439 ArrayRef<Constant*> V, bool Packed = false) {
440 return get(getTypeForElements(Ctx, V, Packed), V);
443 /// getTypeForElements - Return an anonymous struct type to use for a constant
444 /// with the specified set of elements. The list must not be empty.
445 static StructType *getTypeForElements(ArrayRef<Constant*> V,
446 bool Packed = false);
447 /// getTypeForElements - This version of the method allows an empty list.
448 static StructType *getTypeForElements(LLVMContext &Ctx,
449 ArrayRef<Constant*> V,
450 bool Packed = false);
452 /// Transparently provide more efficient getOperand methods.
453 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
455 /// getType() specialization - Reduce amount of casting...
457 inline StructType *getType() const {
458 return reinterpret_cast<StructType*>(Value::getType());
461 virtual void destroyConstant();
462 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
464 /// Methods for support type inquiry through isa, cast, and dyn_cast:
465 static inline bool classof(const ConstantStruct *) { return true; }
466 static bool classof(const Value *V) {
467 return V->getValueID() == ConstantStructVal;
472 struct OperandTraits<ConstantStruct> :
473 public VariadicOperandTraits<ConstantStruct> {
476 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantStruct, Constant)
479 //===----------------------------------------------------------------------===//
480 /// ConstantVector - Constant Vector Declarations
482 class ConstantVector : public Constant {
483 friend struct ConstantCreator<ConstantVector, VectorType,
484 std::vector<Constant*> >;
485 ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
487 ConstantVector(VectorType *T, ArrayRef<Constant *> Val);
489 // ConstantVector accessors
490 static Constant *get(ArrayRef<Constant*> V);
492 /// Transparently provide more efficient getOperand methods.
493 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
495 /// getType - Specialize the getType() method to always return a VectorType,
496 /// which reduces the amount of casting needed in parts of the compiler.
498 inline VectorType *getType() const {
499 return reinterpret_cast<VectorType*>(Value::getType());
502 /// getSplatValue - If this is a splat constant, meaning that all of the
503 /// elements have the same value, return that value. Otherwise return NULL.
504 Constant *getSplatValue() const;
506 virtual void destroyConstant();
507 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
509 /// Methods for support type inquiry through isa, cast, and dyn_cast:
510 static inline bool classof(const ConstantVector *) { return true; }
511 static bool classof(const Value *V) {
512 return V->getValueID() == ConstantVectorVal;
517 struct OperandTraits<ConstantVector> :
518 public VariadicOperandTraits<ConstantVector> {
521 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantVector, Constant)
523 //===----------------------------------------------------------------------===//
524 /// ConstantPointerNull - a constant pointer value that points to null
526 class ConstantPointerNull : public Constant {
527 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
528 ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
530 explicit ConstantPointerNull(PointerType *T)
531 : Constant(reinterpret_cast<Type*>(T),
532 Value::ConstantPointerNullVal, 0, 0) {}
535 // allocate space for exactly zero operands
536 void *operator new(size_t s) {
537 return User::operator new(s, 0);
540 /// get() - Static factory methods - Return objects of the specified value
541 static ConstantPointerNull *get(PointerType *T);
543 virtual void destroyConstant();
545 /// getType - Specialize the getType() method to always return an PointerType,
546 /// which reduces the amount of casting needed in parts of the compiler.
548 inline PointerType *getType() const {
549 return reinterpret_cast<PointerType*>(Value::getType());
552 /// Methods for support type inquiry through isa, cast, and dyn_cast:
553 static inline bool classof(const ConstantPointerNull *) { return true; }
554 static bool classof(const Value *V) {
555 return V->getValueID() == ConstantPointerNullVal;
559 //===----------------------------------------------------------------------===//
560 /// ConstantDataSequential - A vector or array of data that contains no
561 /// relocations, and whose element type is a simple 1/2/4/8-byte integer or
562 /// float/double. This is the common base class of ConstantDataArray and
563 /// ConstantDataVector.
565 class ConstantDataSequential : public Constant {
566 friend class LLVMContextImpl;
567 /// DataElements - A pointer to the bytes underlying this constant (which is
568 /// owned by the uniquing StringMap).
569 const char *DataElements;
571 /// Next - This forms a link list of ConstantDataSequential nodes that have
572 /// the same value but different type. For example, 0,0,0,1 could be a 4
573 /// element array of i8, or a 1-element array of i32. They'll both end up in
574 /// the same StringMap bucket, linked up.
575 ConstantDataSequential *Next;
576 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
577 ConstantDataSequential(const ConstantDataSequential &); // DO NOT IMPLEMENT
579 explicit ConstantDataSequential(Type *ty, ValueTy VT, const char *Data)
580 : Constant(ty, VT, 0, 0), DataElements(Data) {}
581 ~ConstantDataSequential() { delete Next; }
583 static Constant *getImpl(StringRef Bytes, Type *Ty);
586 // allocate space for exactly zero operands.
587 void *operator new(size_t s) {
588 return User::operator new(s, 0);
592 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
593 /// formed with a vector or array of the specified element type.
594 /// ConstantDataArray only works with normal float and int types that are
595 /// stored densely in memory, not with things like i42 or x86_f80.
596 static bool isElementTypeCompatible(const Type *Ty);
598 /// getElementAsInteger - If this is a sequential container of integers (of
599 /// any size), return the specified element in the low bits of a uint64_t.
600 uint64_t getElementAsInteger(unsigned i) const;
602 /// getElementAsAPFloat - If this is a sequential container of floating point
603 /// type, return the specified element as an APFloat.
604 APFloat getElementAsAPFloat(unsigned i) const;
606 /// getElementAsFloat - If this is an sequential container of floats, return
607 /// the specified element as a float.
608 float getElementAsFloat(unsigned i) const;
610 /// getElementAsDouble - If this is an sequential container of doubles, return
611 /// the specified element as a float.
612 double getElementAsDouble(unsigned i) const;
614 /// getElementAsConstant - Return a Constant for a specified index's element.
615 /// Note that this has to compute a new constant to return, so it isn't as
616 /// efficient as getElementAsInteger/Float/Double.
617 Constant *getElementAsConstant(unsigned i) const;
619 /// getType - Specialize the getType() method to always return a
620 /// SequentialType, which reduces the amount of casting needed in parts of the
622 inline SequentialType *getType() const {
623 return reinterpret_cast<SequentialType*>(Value::getType());
626 /// getElementType - Return the element type of the array/vector.
627 Type *getElementType() const;
629 /// getNumElements - Return the number of elements in the array or vector.
630 unsigned getNumElements() const;
632 /// getElementByteSize - Return the size (in bytes) of each element in the
633 /// array/vector. The size of the elements is known to be a multiple of one
635 uint64_t getElementByteSize() const;
638 /// isString - This method returns true if this is an array of i8.
639 bool isString() const;
641 /// isCString - This method returns true if the array "isString", ends with a
642 /// nul byte, and does not contains any other nul bytes.
643 bool isCString() const;
645 /// getAsString - If this array is isString(), then this method returns the
646 /// array as a StringRef. Otherwise, it asserts out.
648 StringRef getAsString() const {
649 assert(isString() && "Not a string");
650 return getRawDataValues();
653 /// getAsCString - If this array is isCString(), then this method returns the
654 /// array (without the trailing null byte) as a StringRef. Otherwise, it
657 StringRef getAsCString() const {
658 assert(isCString() && "Isn't a C string");
659 StringRef Str = getAsString();
660 return Str.substr(0, Str.size()-1);
663 /// getRawDataValues - Return the raw, underlying, bytes of this data. Note
664 /// that this is an extremely tricky thing to work with, as it exposes the
665 /// host endianness of the data elements.
666 StringRef getRawDataValues() const;
668 virtual void destroyConstant();
670 /// Methods for support type inquiry through isa, cast, and dyn_cast:
672 static bool classof(const ConstantDataSequential *) { return true; }
673 static bool classof(const Value *V) {
674 return V->getValueID() == ConstantDataArrayVal ||
675 V->getValueID() == ConstantDataVectorVal;
678 const char *getElementPointer(unsigned Elt) const;
681 //===----------------------------------------------------------------------===//
682 /// ConstantDataArray - An array of data that contains no relocations, and whose
683 /// element type is a simple 1/2/4/8-byte integer or float/double.
685 class ConstantDataArray : public ConstantDataSequential {
686 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
687 ConstantDataArray(const ConstantDataArray &); // DO NOT IMPLEMENT
688 virtual void anchor();
689 friend class ConstantDataSequential;
690 explicit ConstantDataArray(Type *ty, const char *Data)
691 : ConstantDataSequential(ty, ConstantDataArrayVal, Data) {}
693 // allocate space for exactly zero operands.
694 void *operator new(size_t s) {
695 return User::operator new(s, 0);
699 /// get() constructors - Return a constant with array type with an element
700 /// count and element type matching the ArrayRef passed in. Note that this
701 /// can return a ConstantAggregateZero object.
702 static Constant *get(LLVMContext &Context, ArrayRef<uint8_t> Elts);
703 static Constant *get(LLVMContext &Context, ArrayRef<uint16_t> Elts);
704 static Constant *get(LLVMContext &Context, ArrayRef<uint32_t> Elts);
705 static Constant *get(LLVMContext &Context, ArrayRef<uint64_t> Elts);
706 static Constant *get(LLVMContext &Context, ArrayRef<float> Elts);
707 static Constant *get(LLVMContext &Context, ArrayRef<double> Elts);
709 /// getString - This method constructs a CDS and initializes it with a text
710 /// string. The default behavior (AddNull==true) causes a null terminator to
711 /// be placed at the end of the array (increasing the length of the string by
712 /// one more than the StringRef would normally indicate. Pass AddNull=false
713 /// to disable this behavior.
714 static Constant *getString(LLVMContext &Context, StringRef Initializer,
715 bool AddNull = true);
717 /// getType - Specialize the getType() method to always return an ArrayType,
718 /// which reduces the amount of casting needed in parts of the compiler.
720 inline ArrayType *getType() const {
721 return reinterpret_cast<ArrayType*>(Value::getType());
724 /// Methods for support type inquiry through isa, cast, and dyn_cast:
726 static bool classof(const ConstantDataArray *) { return true; }
727 static bool classof(const Value *V) {
728 return V->getValueID() == ConstantDataArrayVal;
732 //===----------------------------------------------------------------------===//
733 /// ConstantDataVector - A vector of data that contains no relocations, and
734 /// whose element type is a simple 1/2/4/8-byte integer or float/double.
736 class ConstantDataVector : public ConstantDataSequential {
737 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
738 ConstantDataVector(const ConstantDataVector &); // DO NOT IMPLEMENT
739 virtual void anchor();
740 friend class ConstantDataSequential;
741 explicit ConstantDataVector(Type *ty, const char *Data)
742 : ConstantDataSequential(ty, ConstantDataVectorVal, Data) {}
744 // allocate space for exactly zero operands.
745 void *operator new(size_t s) {
746 return User::operator new(s, 0);
750 /// get() constructors - Return a constant with vector type with an element
751 /// count and element type matching the ArrayRef passed in. Note that this
752 /// can return a ConstantAggregateZero object.
753 static Constant *get(LLVMContext &Context, ArrayRef<uint8_t> Elts);
754 static Constant *get(LLVMContext &Context, ArrayRef<uint16_t> Elts);
755 static Constant *get(LLVMContext &Context, ArrayRef<uint32_t> Elts);
756 static Constant *get(LLVMContext &Context, ArrayRef<uint64_t> Elts);
757 static Constant *get(LLVMContext &Context, ArrayRef<float> Elts);
758 static Constant *get(LLVMContext &Context, ArrayRef<double> Elts);
760 /// getType - Specialize the getType() method to always return a VectorType,
761 /// which reduces the amount of casting needed in parts of the compiler.
763 inline VectorType *getType() const {
764 return reinterpret_cast<VectorType*>(Value::getType());
767 /// Methods for support type inquiry through isa, cast, and dyn_cast:
769 static bool classof(const ConstantDataVector *) { return true; }
770 static bool classof(const Value *V) {
771 return V->getValueID() == ConstantDataVectorVal;
777 /// BlockAddress - The address of a basic block.
779 class BlockAddress : public Constant {
780 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
781 void *operator new(size_t s) { return User::operator new(s, 2); }
782 BlockAddress(Function *F, BasicBlock *BB);
784 /// get - Return a BlockAddress for the specified function and basic block.
785 static BlockAddress *get(Function *F, BasicBlock *BB);
787 /// get - Return a BlockAddress for the specified basic block. The basic
788 /// block must be embedded into a function.
789 static BlockAddress *get(BasicBlock *BB);
791 /// Transparently provide more efficient getOperand methods.
792 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
794 Function *getFunction() const { return (Function*)Op<0>().get(); }
795 BasicBlock *getBasicBlock() const { return (BasicBlock*)Op<1>().get(); }
797 virtual void destroyConstant();
798 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
800 /// Methods for support type inquiry through isa, cast, and dyn_cast:
801 static inline bool classof(const BlockAddress *) { return true; }
802 static inline bool classof(const Value *V) {
803 return V->getValueID() == BlockAddressVal;
808 struct OperandTraits<BlockAddress> :
809 public FixedNumOperandTraits<BlockAddress, 2> {
812 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(BlockAddress, Value)
815 //===----------------------------------------------------------------------===//
816 /// ConstantExpr - a constant value that is initialized with an expression using
817 /// other constant values.
819 /// This class uses the standard Instruction opcodes to define the various
820 /// constant expressions. The Opcode field for the ConstantExpr class is
821 /// maintained in the Value::SubclassData field.
822 class ConstantExpr : public Constant {
823 friend struct ConstantCreator<ConstantExpr,Type,
824 std::pair<unsigned, std::vector<Constant*> > >;
825 friend struct ConvertConstantType<ConstantExpr, Type>;
828 ConstantExpr(Type *ty, unsigned Opcode, Use *Ops, unsigned NumOps)
829 : Constant(ty, ConstantExprVal, Ops, NumOps) {
830 // Operation type (an Instruction opcode) is stored as the SubclassData.
831 setValueSubclassData(Opcode);
835 // Static methods to construct a ConstantExpr of different kinds. Note that
836 // these methods may return a object that is not an instance of the
837 // ConstantExpr class, because they will attempt to fold the constant
838 // expression into something simpler if possible.
840 /// getAlignOf constant expr - computes the alignment of a type in a target
841 /// independent way (Note: the return type is an i64).
842 static Constant *getAlignOf(Type *Ty);
844 /// getSizeOf constant expr - computes the (alloc) size of a type (in
845 /// address-units, not bits) in a target independent way (Note: the return
848 static Constant *getSizeOf(Type *Ty);
850 /// getOffsetOf constant expr - computes the offset of a struct field in a
851 /// target independent way (Note: the return type is an i64).
853 static Constant *getOffsetOf(StructType *STy, unsigned FieldNo);
855 /// getOffsetOf constant expr - This is a generalized form of getOffsetOf,
856 /// which supports any aggregate type, and any Constant index.
858 static Constant *getOffsetOf(Type *Ty, Constant *FieldNo);
860 static Constant *getNeg(Constant *C, bool HasNUW = false, bool HasNSW =false);
861 static Constant *getFNeg(Constant *C);
862 static Constant *getNot(Constant *C);
863 static Constant *getAdd(Constant *C1, Constant *C2,
864 bool HasNUW = false, bool HasNSW = false);
865 static Constant *getFAdd(Constant *C1, Constant *C2);
866 static Constant *getSub(Constant *C1, Constant *C2,
867 bool HasNUW = false, bool HasNSW = false);
868 static Constant *getFSub(Constant *C1, Constant *C2);
869 static Constant *getMul(Constant *C1, Constant *C2,
870 bool HasNUW = false, bool HasNSW = false);
871 static Constant *getFMul(Constant *C1, Constant *C2);
872 static Constant *getUDiv(Constant *C1, Constant *C2, bool isExact = false);
873 static Constant *getSDiv(Constant *C1, Constant *C2, bool isExact = false);
874 static Constant *getFDiv(Constant *C1, Constant *C2);
875 static Constant *getURem(Constant *C1, Constant *C2);
876 static Constant *getSRem(Constant *C1, Constant *C2);
877 static Constant *getFRem(Constant *C1, Constant *C2);
878 static Constant *getAnd(Constant *C1, Constant *C2);
879 static Constant *getOr(Constant *C1, Constant *C2);
880 static Constant *getXor(Constant *C1, Constant *C2);
881 static Constant *getShl(Constant *C1, Constant *C2,
882 bool HasNUW = false, bool HasNSW = false);
883 static Constant *getLShr(Constant *C1, Constant *C2, bool isExact = false);
884 static Constant *getAShr(Constant *C1, Constant *C2, bool isExact = false);
885 static Constant *getTrunc (Constant *C, Type *Ty);
886 static Constant *getSExt (Constant *C, Type *Ty);
887 static Constant *getZExt (Constant *C, Type *Ty);
888 static Constant *getFPTrunc (Constant *C, Type *Ty);
889 static Constant *getFPExtend(Constant *C, Type *Ty);
890 static Constant *getUIToFP (Constant *C, Type *Ty);
891 static Constant *getSIToFP (Constant *C, Type *Ty);
892 static Constant *getFPToUI (Constant *C, Type *Ty);
893 static Constant *getFPToSI (Constant *C, Type *Ty);
894 static Constant *getPtrToInt(Constant *C, Type *Ty);
895 static Constant *getIntToPtr(Constant *C, Type *Ty);
896 static Constant *getBitCast (Constant *C, Type *Ty);
898 static Constant *getNSWNeg(Constant *C) { return getNeg(C, false, true); }
899 static Constant *getNUWNeg(Constant *C) { return getNeg(C, true, false); }
900 static Constant *getNSWAdd(Constant *C1, Constant *C2) {
901 return getAdd(C1, C2, false, true);
903 static Constant *getNUWAdd(Constant *C1, Constant *C2) {
904 return getAdd(C1, C2, true, false);
906 static Constant *getNSWSub(Constant *C1, Constant *C2) {
907 return getSub(C1, C2, false, true);
909 static Constant *getNUWSub(Constant *C1, Constant *C2) {
910 return getSub(C1, C2, true, false);
912 static Constant *getNSWMul(Constant *C1, Constant *C2) {
913 return getMul(C1, C2, false, true);
915 static Constant *getNUWMul(Constant *C1, Constant *C2) {
916 return getMul(C1, C2, true, false);
918 static Constant *getNSWShl(Constant *C1, Constant *C2) {
919 return getShl(C1, C2, false, true);
921 static Constant *getNUWShl(Constant *C1, Constant *C2) {
922 return getShl(C1, C2, true, false);
924 static Constant *getExactSDiv(Constant *C1, Constant *C2) {
925 return getSDiv(C1, C2, true);
927 static Constant *getExactUDiv(Constant *C1, Constant *C2) {
928 return getUDiv(C1, C2, true);
930 static Constant *getExactAShr(Constant *C1, Constant *C2) {
931 return getAShr(C1, C2, true);
933 static Constant *getExactLShr(Constant *C1, Constant *C2) {
934 return getLShr(C1, C2, true);
937 /// Transparently provide more efficient getOperand methods.
938 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
940 // @brief Convenience function for getting one of the casting operations
941 // using a CastOps opcode.
942 static Constant *getCast(
943 unsigned ops, ///< The opcode for the conversion
944 Constant *C, ///< The constant to be converted
945 Type *Ty ///< The type to which the constant is converted
948 // @brief Create a ZExt or BitCast cast constant expression
949 static Constant *getZExtOrBitCast(
950 Constant *C, ///< The constant to zext or bitcast
951 Type *Ty ///< The type to zext or bitcast C to
954 // @brief Create a SExt or BitCast cast constant expression
955 static Constant *getSExtOrBitCast(
956 Constant *C, ///< The constant to sext or bitcast
957 Type *Ty ///< The type to sext or bitcast C to
960 // @brief Create a Trunc or BitCast cast constant expression
961 static Constant *getTruncOrBitCast(
962 Constant *C, ///< The constant to trunc or bitcast
963 Type *Ty ///< The type to trunc or bitcast C to
966 /// @brief Create a BitCast or a PtrToInt cast constant expression
967 static Constant *getPointerCast(
968 Constant *C, ///< The pointer value to be casted (operand 0)
969 Type *Ty ///< The type to which cast should be made
972 /// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
973 static Constant *getIntegerCast(
974 Constant *C, ///< The integer constant to be casted
975 Type *Ty, ///< The integer type to cast to
976 bool isSigned ///< Whether C should be treated as signed or not
979 /// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
980 static Constant *getFPCast(
981 Constant *C, ///< The integer constant to be casted
982 Type *Ty ///< The integer type to cast to
985 /// @brief Return true if this is a convert constant expression
988 /// @brief Return true if this is a compare constant expression
989 bool isCompare() const;
991 /// @brief Return true if this is an insertvalue or extractvalue expression,
992 /// and the getIndices() method may be used.
993 bool hasIndices() const;
995 /// @brief Return true if this is a getelementptr expression and all
996 /// the index operands are compile-time known integers within the
997 /// corresponding notional static array extents. Note that this is
998 /// not equivalant to, a subset of, or a superset of the "inbounds"
1000 bool isGEPWithNoNotionalOverIndexing() const;
1002 /// Select constant expr
1004 static Constant *getSelect(Constant *C, Constant *V1, Constant *V2);
1006 /// get - Return a binary or shift operator constant expression,
1007 /// folding if possible.
1009 static Constant *get(unsigned Opcode, Constant *C1, Constant *C2,
1010 unsigned Flags = 0);
1012 /// @brief Return an ICmp or FCmp comparison operator constant expression.
1013 static Constant *getCompare(unsigned short pred, Constant *C1, Constant *C2);
1015 /// get* - Return some common constants without having to
1016 /// specify the full Instruction::OPCODE identifier.
1018 static Constant *getICmp(unsigned short pred, Constant *LHS, Constant *RHS);
1019 static Constant *getFCmp(unsigned short pred, Constant *LHS, Constant *RHS);
1021 /// Getelementptr form. Value* is only accepted for convenience;
1022 /// all elements must be Constant's.
1024 static Constant *getGetElementPtr(Constant *C,
1025 ArrayRef<Constant *> IdxList,
1026 bool InBounds = false) {
1027 return getGetElementPtr(C, makeArrayRef((Value * const *)IdxList.data(),
1031 static Constant *getGetElementPtr(Constant *C,
1033 bool InBounds = false) {
1034 // This form of the function only exists to avoid ambiguous overload
1035 // warnings about whether to convert Idx to ArrayRef<Constant *> or
1036 // ArrayRef<Value *>.
1037 return getGetElementPtr(C, cast<Value>(Idx), InBounds);
1039 static Constant *getGetElementPtr(Constant *C,
1040 ArrayRef<Value *> IdxList,
1041 bool InBounds = false);
1043 /// Create an "inbounds" getelementptr. See the documentation for the
1044 /// "inbounds" flag in LangRef.html for details.
1045 static Constant *getInBoundsGetElementPtr(Constant *C,
1046 ArrayRef<Constant *> IdxList) {
1047 return getGetElementPtr(C, IdxList, true);
1049 static Constant *getInBoundsGetElementPtr(Constant *C,
1051 // This form of the function only exists to avoid ambiguous overload
1052 // warnings about whether to convert Idx to ArrayRef<Constant *> or
1053 // ArrayRef<Value *>.
1054 return getGetElementPtr(C, Idx, true);
1056 static Constant *getInBoundsGetElementPtr(Constant *C,
1057 ArrayRef<Value *> IdxList) {
1058 return getGetElementPtr(C, IdxList, true);
1061 static Constant *getExtractElement(Constant *Vec, Constant *Idx);
1062 static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
1063 static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
1064 static Constant *getExtractValue(Constant *Agg, ArrayRef<unsigned> Idxs);
1065 static Constant *getInsertValue(Constant *Agg, Constant *Val,
1066 ArrayRef<unsigned> Idxs);
1068 /// getOpcode - Return the opcode at the root of this constant expression
1069 unsigned getOpcode() const { return getSubclassDataFromValue(); }
1071 /// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
1072 /// not an ICMP or FCMP constant expression.
1073 unsigned getPredicate() const;
1075 /// getIndices - Assert that this is an insertvalue or exactvalue
1076 /// expression and return the list of indices.
1077 ArrayRef<unsigned> getIndices() const;
1079 /// getOpcodeName - Return a string representation for an opcode.
1080 const char *getOpcodeName() const;
1082 /// getWithOperandReplaced - Return a constant expression identical to this
1083 /// one, but with the specified operand set to the specified value.
1084 Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
1086 /// getWithOperands - This returns the current constant expression with the
1087 /// operands replaced with the specified values. The specified array must
1088 /// have the same number of operands as our current one.
1089 Constant *getWithOperands(ArrayRef<Constant*> Ops) const {
1090 return getWithOperands(Ops, getType());
1093 /// getWithOperands - This returns the current constant expression with the
1094 /// operands replaced with the specified values and with the specified result
1095 /// type. The specified array must have the same number of operands as our
1097 Constant *getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const;
1099 virtual void destroyConstant();
1100 virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
1102 /// Methods for support type inquiry through isa, cast, and dyn_cast:
1103 static inline bool classof(const ConstantExpr *) { return true; }
1104 static inline bool classof(const Value *V) {
1105 return V->getValueID() == ConstantExprVal;
1109 // Shadow Value::setValueSubclassData with a private forwarding method so that
1110 // subclasses cannot accidentally use it.
1111 void setValueSubclassData(unsigned short D) {
1112 Value::setValueSubclassData(D);
1117 struct OperandTraits<ConstantExpr> :
1118 public VariadicOperandTraits<ConstantExpr, 1> {
1121 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantExpr, Constant)
1123 //===----------------------------------------------------------------------===//
1124 /// UndefValue - 'undef' values are things that do not have specified contents.
1125 /// These are used for a variety of purposes, including global variable
1126 /// initializers and operands to instructions. 'undef' values can occur with
1127 /// any first-class type.
1129 /// Undef values aren't exactly constants; if they have multiple uses, they
1130 /// can appear to have different bit patterns at each use. See
1131 /// LangRef.html#undefvalues for details.
1133 class UndefValue : public Constant {
1134 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
1135 UndefValue(const UndefValue &); // DO NOT IMPLEMENT
1137 explicit UndefValue(Type *T) : Constant(T, UndefValueVal, 0, 0) {}
1139 // allocate space for exactly zero operands
1140 void *operator new(size_t s) {
1141 return User::operator new(s, 0);
1144 /// get() - Static factory methods - Return an 'undef' object of the specified
1147 static UndefValue *get(Type *T);
1149 /// getSequentialElement - If this Undef has array or vector type, return a
1150 /// undef with the right element type.
1151 UndefValue *getSequentialElement();
1153 /// getStructElement - If this undef has struct type, return a undef with the
1154 /// right element type for the specified element.
1155 UndefValue *getStructElement(unsigned Elt);
1157 /// getElementValue - Return an undef of the right value for the specified GEP
1159 UndefValue *getElementValue(Constant *C);
1161 /// getElementValue - Return an undef of the right value for the specified GEP
1163 UndefValue *getElementValue(unsigned Idx);
1165 virtual void destroyConstant();
1167 /// Methods for support type inquiry through isa, cast, and dyn_cast:
1168 static inline bool classof(const UndefValue *) { return true; }
1169 static bool classof(const Value *V) {
1170 return V->getValueID() == UndefValueVal;
1174 } // End llvm namespace