llvm-6502/include/llvm/Constants.h
Chris Lattner 6cc89aad25 Remove some cruft, add some methods to allow implementation of bugfix for
Bug: Linker/2003-04-26-NullPtrLinkProblem.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6313 91177308-0d34-0410-b5e6-96231b3b80d8
2003-05-23 20:02:05 +00:00

539 lines
20 KiB
C++

//===-- llvm/Constants.h - Constant class subclass definitions ---*- C++ -*--=//
//
// This file contains the declarations for the subclasses of Constant, which
// represent the different type of constant pool values
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CONSTANTS_H
#define LLVM_CONSTANTS_H
#include "llvm/Constant.h"
#include "Support/DataTypes.h"
class ArrayType;
class StructType;
class PointerType;
template<class ConstantClass, class TypeClass, class ValType>
struct ConstantCreator;
//===---------------------------------------------------------------------------
/// ConstantIntegral - Shared superclass of boolean and integer constants.
///
/// This class just defines some common interfaces to be implemented.
///
class ConstantIntegral : public Constant {
protected:
ConstantIntegral(const Type *Ty) : Constant(Ty) {}
public:
/// 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 Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
/// ConstantBool - Boolean Values
///
class ConstantBool : public ConstantIntegral {
bool Val;
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 Val; }
/// 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 Constant *CPV) {
return (CPV == True) | (CPV == False);
}
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
/// ConstantInt - Superclass of ConstantSInt & ConstantUInt, to make dealing
/// with integral constants easier.
///
class ConstantInt : public ConstantIntegral {
protected:
union {
int64_t Signed;
uint64_t Unsigned;
} Val;
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 &&
"equals: 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 Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
/// 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 Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
/// 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 Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
/// ConstantFP - Floating Point Values [float, double]
///
class ConstantFP : public Constant {
double Val;
friend struct ConstantCreator<ConstantFP, Type, double>;
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.
virtual bool isNullValue() const { return Val == 0; }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantFP *) { return true; }
static bool classof(const Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
/// 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);
void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
public:
/// get() - Static factory methods - Return objects of the specified value
static ConstantArray *get(const ArrayType *T, const std::vector<Constant*> &);
static ConstantArray *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 (ArrayType*)Value::getType();
}
/// getAsString - If the sub-element type of this array is either sbyte or
/// ubyte, then this method converts the array to an std::string and returns
/// it. Otherwise, it asserts out.
///
std::string getAsString() const;
/// getValues - Return a vector of the component constants that make up this
/// array.
inline const std::vector<Use> &getValues() const { return Operands; }
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const {
// FIXME: This should be made to be MUCH faster. Just check against well
// known null value!
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (!cast<Constant>(getOperand(i))->isNullValue())
return false;
return true;
}
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantArray *) { return true; }
static bool classof(const Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
// 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);
void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
public:
/// get() - Static factory methods - Return objects of the specified value
static ConstantStruct *get(const StructType *T,
const std::vector<Constant*> &V);
/// getType() specialization - Reduce amount of casting...
inline const StructType *getType() const {
return (StructType*)Value::getType();
}
/// getValues - Return a vector of the component constants that make up this
/// structure.
inline const std::vector<Use> &getValues() const { return Operands; }
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const {
// FIXME: This should be made to be MUCH faster. Just check against well
// known null value!
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (!cast<Constant>(getOperand(i))->isNullValue())
return false;
return true;
}
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantStruct *) { return true; }
static bool classof(const Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
//===---------------------------------------------------------------------------
/// ConstantPointer - Constant Pointer Declarations
///
/// The ConstantPointer class represents a null pointer of a specific type. For
/// a more specific/useful instance, a subclass of ConstantPointer should be
/// used.
///
class ConstantPointer : public Constant {
ConstantPointer(const ConstantPointer &); // DO NOT IMPLEMENT
protected:
inline ConstantPointer(const PointerType *T) : Constant((const Type*)T) {}
public:
inline const PointerType *getType() const {
return (PointerType*)Value::getType();
}
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const { return false; }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPointer *) { return true; }
static bool classof(const Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
/// ConstantPointerNull - a constant pointer value that points to null
///
class ConstantPointerNull : public ConstantPointer {
friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
protected:
ConstantPointerNull(const PointerType *T) : ConstantPointer(T) {}
void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
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();
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPointerNull *) { return true; }
static inline bool classof(const ConstantPointer *P) {
return (P->getNumOperands() == 0 && P->isNullValue());
}
static inline bool classof(const Constant *CPV) {
return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
}
static inline bool classof(const Value *V) {
return isa<ConstantPointer>(V) && classof(cast<ConstantPointer>(V));
}
};
/// ConstantPointerRef - a constant pointer value that is initialized to
/// point to a global value, which lies at a constant, fixed address.
///
class ConstantPointerRef : public ConstantPointer {
friend class Module; // Modules maintain these references
ConstantPointerRef(const ConstantPointerRef &); // DNI!
protected:
ConstantPointerRef(GlobalValue *GV);
public:
/// get() - Static factory methods - Return objects of the specified value
static ConstantPointerRef *get(GlobalValue *GV);
const GlobalValue *getValue() const {
return cast<GlobalValue>(Operands[0].get());
}
GlobalValue *getValue() {
return cast<GlobalValue>(Operands[0].get());
}
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPointerRef *) { return true; }
static inline bool classof(const ConstantPointer *CPV) {
// check for a single operand (the target value)
return (CPV->getNumOperands() == 1);
}
static inline bool classof(const Constant *CPV) {
return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
}
static inline bool classof(const Value *V) {
return isa<ConstantPointer>(V) && classof(cast<ConstantPointer>(V));
}
};
// 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*> > >;
protected:
// Cast creation ctor
ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty);
// Binary/Shift instruction creation ctor
ConstantExpr(unsigned Opcode, Constant *C1, Constant *C2);
// GEP instruction creation ctor
ConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
const Type *DestTy);
void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
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);
/// Binary constant expr - Use with binary operators...
static Constant *get(unsigned Opcode, Constant *C1, Constant *C2);
/// getShift - Return a shift left or shift right constant expr
static Constant *getShift(unsigned Opcode, Constant *C1, Constant *C2);
/// Getelementptr form...
static Constant *getGetElementPtr(Constant *C,
const std::vector<Constant*> &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;
/// isConstantExpr - Return true if this is a ConstantExpr
virtual bool isConstantExpr() const { return true; }
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To);
/// 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 Constant *CPV) {
return CPV->isConstantExpr();
}
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
};
#endif