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|
//===-- llvm/Constants.h - Constant class subclass definitions --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations for the subclasses of Constant, which
// represent the different flavors of constant values that live in LLVM. Note
// that Constants are immutable (once created they never change) and are fully
// shared by structural equivalence. This means that two structurally
// equivalent constants will always have the same address. Constant's are
// created on demand as needed and never deleted: thus clients don't have to
// worry about the lifetime of the objects.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CONSTANTS_H
#define LLVM_CONSTANTS_H
#include "llvm/Constant.h"
#include "llvm/Type.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
class ArrayType;
class StructType;
class PointerType;
class PackedType;
template<class ConstantClass, class TypeClass, class ValType>
struct ConstantCreator;
template<class ConstantClass, class TypeClass>
struct ConvertConstantType;
//===----------------------------------------------------------------------===//
/// ConstantIntegral - Shared superclass of boolean and integer constants.
///
/// This class just defines some common interfaces to be implemented.
///
class ConstantIntegral : public Constant {
protected:
union {
int64_t Signed;
uint64_t Unsigned;
} Val;
ConstantIntegral(const Type *Ty, uint64_t V);
public:
/// getRawValue - return the underlying value of this constant as a 64-bit
/// unsigned integer value.
///
inline uint64_t getRawValue() const { return Val.Unsigned; }
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
///
virtual bool isNullValue() const = 0;
/// isMaxValue - Return true if this is the largest value that may be
/// represented by this type.
///
virtual bool isMaxValue() const = 0;
/// isMinValue - Return true if this is the smallest value that may be
/// represented by this type.
///
virtual bool isMinValue() const = 0;
/// isAllOnesValue - Return true if every bit in this constant is set to true.
///
virtual bool isAllOnesValue() const = 0;
/// Static constructor to get the maximum/minimum/allones constant of
/// specified (integral) type...
///
static ConstantIntegral *getMaxValue(const Type *Ty);
static ConstantIntegral *getMinValue(const Type *Ty);
static ConstantIntegral *getAllOnesValue(const Type *Ty);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantIntegral *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->isIntegral();
}
};
//===----------------------------------------------------------------------===//
/// ConstantBool - Boolean Values
///
class ConstantBool : public ConstantIntegral {
ConstantBool(bool V);
public:
static ConstantBool *True, *False; // The True & False values
/// get() - Static factory methods - Return objects of the specified value
static ConstantBool *get(bool Value) { return Value ? True : False; }
static ConstantBool *get(const Type *Ty, bool Value) { return get(Value); }
/// inverted - Return the opposite value of the current value.
inline ConstantBool *inverted() const { return (this==True) ? False : True; }
/// getValue - return the boolean value of this constant.
///
inline bool getValue() const { return static_cast<bool>(getRawValue()); }
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
///
virtual bool isNullValue() const { return this == False; }
virtual bool isMaxValue() const { return this == True; }
virtual bool isMinValue() const { return this == False; }
virtual bool isAllOnesValue() const { return this == True; }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantBool *) { return true; }
static bool classof(const Value *V) {
return (V == True) | (V == False);
}
};
//===----------------------------------------------------------------------===//
/// ConstantInt - Superclass of ConstantSInt & ConstantUInt, to make dealing
/// with integral constants easier.
///
class ConstantInt : public ConstantIntegral {
protected:
ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
ConstantInt(const Type *Ty, uint64_t V);
public:
/// equalsInt - Provide a helper method that can be used to determine if the
/// constant contained within is equal to a constant. This only works for
/// very small values, because this is all that can be represented with all
/// types.
///
bool equalsInt(unsigned char V) const {
assert(V <= 127 &&
"equalsInt: Can only be used with very small positive constants!");
return Val.Unsigned == V;
}
/// ConstantInt::get static method: return a ConstantInt with the specified
/// value. as above, we work only with very small values here.
///
static ConstantInt *get(const Type *Ty, unsigned char V);
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const { return Val.Unsigned == 0; }
virtual bool isMaxValue() const = 0;
virtual bool isMinValue() const = 0;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantInt *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->isInteger();
}
};
//===----------------------------------------------------------------------===//
/// ConstantSInt - Signed Integer Values [sbyte, short, int, long]
///
class ConstantSInt : public ConstantInt {
ConstantSInt(const ConstantSInt &); // DO NOT IMPLEMENT
friend struct ConstantCreator<ConstantSInt, Type, int64_t>;
protected:
ConstantSInt(const Type *Ty, int64_t V);
public:
/// get() - Static factory methods - Return objects of the specified value
///
static ConstantSInt *get(const Type *Ty, int64_t V);
/// isValueValidForType - return true if Ty is big enough to represent V.
///
static bool isValueValidForType(const Type *Ty, int64_t V);
/// getValue - return the underlying value of this constant.
///
inline int64_t getValue() const { return Val.Signed; }
virtual bool isAllOnesValue() const { return getValue() == -1; }
/// isMaxValue - Return true if this is the largest value that may be
/// represented by this type.
///
virtual bool isMaxValue() const {
int64_t V = getValue();
if (V < 0) return false; // Be careful about wrap-around on 'long's
++V;
return !isValueValidForType(getType(), V) || V < 0;
}
/// isMinValue - Return true if this is the smallest value that may be
/// represented by this type.
///
virtual bool isMinValue() const {
int64_t V = getValue();
if (V > 0) return false; // Be careful about wrap-around on 'long's
--V;
return !isValueValidForType(getType(), V) || V > 0;
}
/// Methods for support type inquiry through isa, cast, and dyn_cast:
///
static inline bool classof(const ConstantSInt *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->isSigned();
}
};
//===----------------------------------------------------------------------===//
/// ConstantUInt - Unsigned Integer Values [ubyte, ushort, uint, ulong]
///
class ConstantUInt : public ConstantInt {
ConstantUInt(const ConstantUInt &); // DO NOT IMPLEMENT
friend struct ConstantCreator<ConstantUInt, Type, uint64_t>;
protected:
ConstantUInt(const Type *Ty, uint64_t V);
public:
/// get() - Static factory methods - Return objects of the specified value
///
static ConstantUInt *get(const Type *Ty, uint64_t V);
/// isValueValidForType - return true if Ty is big enough to represent V.
///
static bool isValueValidForType(const Type *Ty, uint64_t V);
/// getValue - return the underlying value of this constant.
///
inline uint64_t getValue() const { return Val.Unsigned; }
/// isMaxValue - Return true if this is the largest value that may be
/// represented by this type.
///
virtual bool isAllOnesValue() const;
virtual bool isMaxValue() const { return isAllOnesValue(); }
virtual bool isMinValue() const { return getValue() == 0; }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantUInt *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->isUnsigned();
}
};
//===----------------------------------------------------------------------===//
/// ConstantFP - Floating Point Values [float, double]
///
class ConstantFP : public Constant {
double Val;
friend struct ConstantCreator<ConstantFP, Type, uint64_t>;
friend struct ConstantCreator<ConstantFP, Type, uint32_t>;
ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
protected:
ConstantFP(const Type *Ty, double V);
public:
/// get() - Static factory methods - Return objects of the specified value
static ConstantFP *get(const Type *Ty, double V);
/// isValueValidForType - return true if Ty is big enough to represent V.
static bool isValueValidForType(const Type *Ty, double V);
inline double getValue() const { return Val; }
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue. Don't depend on == for doubles to tell us it's zero, it
/// considers -0.0 to be null as well as 0.0. :(
virtual bool isNullValue() const {
union {
double V;
uint64_t I;
} T;
T.V = Val;
return T.I == 0;
}
/// isExactlyValue - We don't rely on operator== working on double values, as
/// it returns true for things that are clearly not equal, like -0.0 and 0.0.
/// As such, this method can be used to do an exact bit-for-bit comparison of
/// two floating point values.
bool isExactlyValue(double V) const {
union {
double V;
uint64_t I;
} T1;
T1.V = Val;
union {
double V;
uint64_t I;
} T2;
T2.V = V;
return T1.I == T2.I;
}
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantFP *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->isFloatingPoint();
}
};
//===----------------------------------------------------------------------===//
/// ConstantAggregateZero - All zero aggregate value
///
class ConstantAggregateZero : public Constant {
friend struct ConstantCreator<ConstantAggregateZero, Type, char>;
ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
protected:
ConstantAggregateZero(const Type *Ty)
: Constant(Ty, ConstantAggregateZeroVal) {}
public:
/// get() - static factory method for creating a null aggregate. It is
/// illegal to call this method with a non-aggregate type.
static Constant *get(const Type *Ty);
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const { return true; }
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking = false);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
///
static bool classof(const ConstantAggregateZero *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == ConstantAggregateZeroVal;
}
};
//===----------------------------------------------------------------------===//
/// ConstantArray - Constant Array Declarations
///
class ConstantArray : public Constant {
friend struct ConstantCreator<ConstantArray, ArrayType,
std::vector<Constant*> >;
ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
protected:
ConstantArray(const ArrayType *T, const std::vector<Constant*> &Val);
public:
/// get() - Static factory methods - Return objects of the specified value
static Constant *get(const ArrayType *T, const std::vector<Constant*> &);
static Constant *get(const std::string &Initializer);
/// getType - Specialize the getType() method to always return an ArrayType,
/// which reduces the amount of casting needed in parts of the compiler.
///
inline const ArrayType *getType() const {
return reinterpret_cast<const ArrayType*>(Value::getType());
}
/// isString - This method returns true if the array is an array of sbyte or
/// ubyte, and if the elements of the array are all ConstantInt's.
bool isString() const;
/// getAsString - If this array is isString(), then this method converts the
/// array to an std::string and returns it. Otherwise, it asserts out.
///
std::string getAsString() const;
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue. This always returns false because zero arrays are always
/// created as ConstantAggregateZero objects.
virtual bool isNullValue() const { return false; }
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking = false);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantArray *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->getTypeID() == Type::ArrayTyID;
}
};
//===----------------------------------------------------------------------===//
// ConstantStruct - Constant Struct Declarations
//
class ConstantStruct : public Constant {
friend struct ConstantCreator<ConstantStruct, StructType,
std::vector<Constant*> >;
ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
protected:
ConstantStruct(const StructType *T, const std::vector<Constant*> &Val);
public:
/// get() - Static factory methods - Return objects of the specified value
///
static Constant *get(const StructType *T, const std::vector<Constant*> &V);
static Constant *get(const std::vector<Constant*> &V);
/// getType() specialization - Reduce amount of casting...
///
inline const StructType *getType() const {
return reinterpret_cast<const StructType*>(Value::getType());
}
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue. This always returns false because zero structs are always
/// created as ConstantAggregateZero objects.
virtual bool isNullValue() const {
return false;
}
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking = false);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantStruct *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->getTypeID() == Type::StructTyID;
}
};
//===----------------------------------------------------------------------===//
/// ConstantPacked - Constant Packed Declarations
///
class ConstantPacked : public Constant {
friend struct ConstantCreator<ConstantPacked, PackedType,
std::vector<Constant*> >;
ConstantPacked(const ConstantPacked &); // DO NOT IMPLEMENT
protected:
ConstantPacked(const PackedType *T, const std::vector<Constant*> &Val);
public:
/// get() - Static factory methods - Return objects of the specified value
static Constant *get(const PackedType *T, const std::vector<Constant*> &);
static Constant *get(const std::vector<Constant*> &V);
/// getType - Specialize the getType() method to always return an PackedType,
/// which reduces the amount of casting needed in parts of the compiler.
///
inline const PackedType *getType() const {
return reinterpret_cast<const PackedType*>(Value::getType());
}
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue. This always returns false because zero arrays are always
/// created as ConstantAggregateZero objects.
virtual bool isNullValue() const { return false; }
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking = false);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPacked *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
V->getType()->getTypeID() == Type::PackedTyID;
}
};
//===----------------------------------------------------------------------===//
/// ConstantPointerNull - a constant pointer value that points to null
///
class ConstantPointerNull : public Constant {
friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
protected:
ConstantPointerNull(const PointerType *T)
: Constant(reinterpret_cast<const Type*>(T)) {}
public:
/// get() - Static factory methods - Return objects of the specified value
static ConstantPointerNull *get(const PointerType *T);
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const { return true; }
virtual void destroyConstant();
/// getType - Specialize the getType() method to always return an PointerType,
/// which reduces the amount of casting needed in parts of the compiler.
///
inline const PointerType *getType() const {
return reinterpret_cast<const PointerType*>(Value::getType());
}
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPointerNull *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == SimpleConstantVal &&
isa<PointerType>(V->getType());
}
};
/// ConstantExpr - a constant value that is initialized with an expression using
/// other constant values. This is only used to represent values that cannot be
/// evaluated at compile-time (e.g., something derived from an address) because
/// it does not have a mechanism to store the actual value. Use the appropriate
/// Constant subclass above for known constants.
///
class ConstantExpr : public Constant {
unsigned iType; // Operation type (an Instruction opcode)
friend struct ConstantCreator<ConstantExpr,Type,
std::pair<unsigned, std::vector<Constant*> > >;
friend struct ConvertConstantType<ConstantExpr, Type>;
protected:
// Cast creation ctor
ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty);
// Binary/Shift instruction creation ctor
ConstantExpr(unsigned Opcode, Constant *C1, Constant *C2);
// Select instruction creation ctor
ConstantExpr(Constant *C, Constant *V1, Constant *V2);
// GEP instruction creation ctor
ConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
const Type *DestTy);
// These private methods are used by the type resolution code to create
// ConstantExprs in intermediate forms.
static Constant *getTy(const Type *Ty, unsigned Opcode,
Constant *C1, Constant *C2);
static Constant *getShiftTy(const Type *Ty,
unsigned Opcode, Constant *C1, Constant *C2);
static Constant *getSelectTy(const Type *Ty,
Constant *C1, Constant *C2, Constant *C3);
static Constant *getGetElementPtrTy(const Type *Ty, Constant *C,
const std::vector<Value*> &IdxList);
public:
// Static methods to construct a ConstantExpr of different kinds. Note that
// these methods may return a object that is not an instance of the
// ConstantExpr class, because they will attempt to fold the constant
// expression into something simpler if possible.
/// Cast constant expr
///
static Constant *getCast(Constant *C, const Type *Ty);
static Constant *getSignExtend(Constant *C, const Type *Ty);
static Constant *getZeroExtend(Constant *C, const Type *Ty);
/// Select constant expr
///
static Constant *getSelect(Constant *C, Constant *V1, Constant *V2) {
return getSelectTy(V1->getType(), C, V1, V2);
}
/// getSizeOf constant expr - computes the size of a type in a target
/// independent way (Note: the return type UInt but the object is is not
/// necessarily a ConstantUInt).
///
static Constant *getSizeOf(const Type *Ty);
/// ConstantExpr::get - Return a binary or shift operator constant expression,
/// folding if possible.
///
static Constant *get(unsigned Opcode, Constant *C1, Constant *C2);
/// ConstantExpr::get* - Return some common constants without having to
/// specify the full Instruction::OPCODE identifier.
///
static Constant *getNeg(Constant *C);
static Constant *getNot(Constant *C);
static Constant *getAdd(Constant *C1, Constant *C2);
static Constant *getSub(Constant *C1, Constant *C2);
static Constant *getMul(Constant *C1, Constant *C2);
static Constant *getDiv(Constant *C1, Constant *C2);
static Constant *getRem(Constant *C1, Constant *C2);
static Constant *getAnd(Constant *C1, Constant *C2);
static Constant *getOr(Constant *C1, Constant *C2);
static Constant *getXor(Constant *C1, Constant *C2);
static Constant *getSetEQ(Constant *C1, Constant *C2);
static Constant *getSetNE(Constant *C1, Constant *C2);
static Constant *getSetLT(Constant *C1, Constant *C2);
static Constant *getSetGT(Constant *C1, Constant *C2);
static Constant *getSetLE(Constant *C1, Constant *C2);
static Constant *getSetGE(Constant *C1, Constant *C2);
static Constant *getShl(Constant *C1, Constant *C2);
static Constant *getShr(Constant *C1, Constant *C2);
static Constant *getUShr(Constant *C1, Constant *C2); // unsigned shr
static Constant *getSShr(Constant *C1, Constant *C2); // signed shr
/// Getelementptr form. std::vector<Value*> is only accepted for convenience:
/// all elements must be Constant's.
///
static Constant *getGetElementPtr(Constant *C,
const std::vector<Constant*> &IdxList);
static Constant *getGetElementPtr(Constant *C,
const std::vector<Value*> &IdxList);
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const { return false; }
/// getOpcode - Return the opcode at the root of this constant expression
unsigned getOpcode() const { return iType; }
/// getOpcodeName - Return a string representation for an opcode.
const char *getOpcodeName() const;
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking = false);
/// Override methods to provide more type information...
inline Constant *getOperand(unsigned i) {
return cast<Constant>(User::getOperand(i));
}
inline Constant *getOperand(unsigned i) const {
return const_cast<Constant*>(cast<Constant>(User::getOperand(i)));
}
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantExpr *) { return true; }
static inline bool classof(const Value *V) {
return V->getValueType() == ConstantExprVal;
}
};
//===----------------------------------------------------------------------===//
/// UndefValue - 'undef' values are things that do not have specified contents.
/// These are used for a variety of purposes, including global variable
/// initializers and operands to instructions. 'undef' values can occur with
/// any type.
///
class UndefValue : public Constant {
friend struct ConstantCreator<UndefValue, Type, char>;
UndefValue(const UndefValue &); // DO NOT IMPLEMENT
protected:
UndefValue(const Type *T) : Constant(T, UndefValueVal) {}
public:
/// get() - Static factory methods - Return an 'undef' object of the specified
/// type.
///
static UndefValue *get(const Type *T);
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const { return false; }
virtual void destroyConstant();
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const UndefValue *) { return true; }
static bool classof(const Value *V) {
return V->getValueType() == UndefValueVal;
}
};
} // End llvm namespace
#endif
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