-//===-- llvm/ConstantVals.h - Constant Value nodes ---------------*- C++ -*--=//
+//===-- llvm/Constants.h - Constant class subclass definitions --*- C++ -*-===//
//
-// This file contains the declarations for the Constant class and all of
-// its subclasses, which represent the different type of constant pool values
+// 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_CONSTPOOLVALS_H
-#define LLVM_CONSTPOOLVALS_H
+#ifndef LLVM_CONSTANTS_H
+#define LLVM_CONSTANTS_H
-#include "llvm/User.h"
-#include "Support/DataTypes.h"
+#include "llvm/Constant.h"
+#include "llvm/Type.h"
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
class ArrayType;
class StructType;
class PointerType;
+class PackedType;
-//===----------------------------------------------------------------------===//
-// Constant Class
-//===----------------------------------------------------------------------===//
+template<class ConstantClass, class TypeClass, class ValType>
+struct ConstantCreator;
+template<class ConstantClass, class TypeClass>
+struct ConvertConstantType;
-class Constant : public User {
+//===----------------------------------------------------------------------===//
+/// ConstantIntegral - Shared superclass of boolean and integer constants.
+///
+/// This class just defines some common interfaces to be implemented.
+///
+class ConstantIntegral : public Constant {
protected:
- inline Constant(const Type *Ty) : User(Ty, Value::ConstantVal) {}
- ~Constant() {}
-
- // destroyConstant - Called if some element of this constant is no longer
- // valid. At this point only other constants may be on the use_list for this
- // constant. Any constants on our Use list must also be destroy'd. The
- // implementation must be sure to remove the constant from the list of
- // available cached constants. Implementations should call
- // destroyConstantImpl as the last thing they do, to destroy all users and
- // delete this.
- //
- virtual void destroyConstant() { assert(0 && "Not reached!"); }
- void destroyConstantImpl();
+ union {
+ int64_t Signed;
+ uint64_t Unsigned;
+ } Val;
+ ConstantIntegral(const Type *Ty, uint64_t V);
public:
- // Specialize setName to handle symbol table majik...
- virtual void setName(const std::string &name, SymbolTable *ST = 0);
- virtual std::string getStrValue() const = 0;
+ /// getRawValue - return the underlying value of this constant as a 64-bit
+ /// unsigned integer value.
+ ///
+ inline uint64_t getRawValue() const { return Val.Unsigned; }
- // Static constructor to get a '0' constant of arbitrary type...
- static Constant *getNullConstant(const Type *Ty);
-
- // isNullValue - Return true if this is the value that would be returned by
- // getNullConstant.
+ /// isNullValue - Return true if this is the value that would be returned by
+ /// getNullValue.
+ ///
virtual bool isNullValue() const = 0;
- // Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const Constant *) { return true; }
- static inline bool classof(const Value *V) {
- return V->getValueType() == Value::ConstantVal;
+ /// 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();
}
};
-
//===----------------------------------------------------------------------===//
-// Classes to represent constant pool variable defs
-//===----------------------------------------------------------------------===//
-
-//===---------------------------------------------------------------------------
-// ConstantBool - Boolean Values
-//
-class ConstantBool : public Constant {
- bool Val;
- ConstantBool(const ConstantBool &); // DO NOT IMPLEMENT
+/// ConstantBool - Boolean Values
+///
+class ConstantBool : public ConstantIntegral {
ConstantBool(bool V);
- ~ConstantBool() {}
public:
static ConstantBool *True, *False; // The True & False values
- // Factory objects - Return objects of the specified value
+ /// 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.
+ /// inverted - Return the opposite value of the current value.
inline ConstantBool *inverted() const { return (this==True) ? False : True; }
- virtual std::string getStrValue() const;
- inline bool getValue() const { return Val; }
+ /// 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
- // getNullConstant.
+ /// 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:
+ /// 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));
+ 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 Constant {
+//===----------------------------------------------------------------------===//
+/// 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);
- ~ConstantInt() {}
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.
- //
+ /// 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!");
+ "equalsInt: Can only be used with very small positive constants!");
return Val.Unsigned == V;
}
- // ConstantInt::get static method: return a constant pool int with the
- // specified value. as above, we work only with very small values here.
- //
+ /// 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
- // getNullConstant.
+ /// 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:
+ /// 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 CPV.cpp
- static inline bool classof(const Value *V) {
- return isa<Constant>(V) && classof(cast<Constant>(V));
+ static bool classof(const Value *V) {
+ return V->getValueType() == SimpleConstantVal &&
+ V->getType()->isInteger();
}
};
-//===---------------------------------------------------------------------------
-// ConstantSInt - Signed Integer Values [sbyte, short, int, long]
-//
+//===----------------------------------------------------------------------===//
+/// 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);
- ~ConstantSInt() {}
public:
+ /// get() - Static factory methods - Return objects of the specified value
+ ///
static ConstantSInt *get(const Type *Ty, int64_t V);
- virtual std::string getStrValue() const;
-
+ /// 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; }
- // Methods for support type inquiry through isa, cast, and dyn_cast:
+ 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 CPV.cpp
- static inline bool classof(const Value *V) {
- return isa<Constant>(V) && classof(cast<Constant>(V));
+ static bool classof(const Value *V) {
+ return V->getValueType() == SimpleConstantVal &&
+ V->getType()->isSigned();
}
};
-//===---------------------------------------------------------------------------
-// ConstantUInt - Unsigned Integer Values [ubyte, ushort, uint, ulong]
-//
+//===----------------------------------------------------------------------===//
+/// 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);
- ~ConstantUInt() {}
public:
+ /// get() - Static factory methods - Return objects of the specified value
+ ///
static ConstantUInt *get(const Type *Ty, uint64_t V);
- virtual std::string getStrValue() const;
-
+ /// 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; }
- // Methods for support type inquiry through isa, cast, and dyn_cast:
+ /// 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 CPV.cpp
- static inline bool classof(const Value *V) {
- return isa<Constant>(V) && classof(cast<Constant>(V));
+ static bool classof(const Value *V) {
+ return V->getValueType() == SimpleConstantVal &&
+ V->getType()->isUnsigned();
}
};
-//===---------------------------------------------------------------------------
-// ConstantFP - Floating Point Values [float, double]
-//
+//===----------------------------------------------------------------------===//
+/// 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);
- ~ConstantFP() {}
public:
+ /// get() - Static factory methods - Return objects of the specified value
static ConstantFP *get(const Type *Ty, double V);
- virtual std::string getStrValue() const;
-
+ /// 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
- // getNullConstant.
- virtual bool isNullValue() const { return Val == 0; }
+ /// 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;
+ }
- // Methods for support type inquiry through isa, cast, and dyn_cast:
+ /// 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 Constant *CPV); // defined in CPV.cpp
- static inline bool classof(const Value *V) {
- return isa<Constant>(V) && classof(cast<Constant>(V));
+ 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, 0, 0) {}
+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; }
-//===---------------------------------------------------------------------------
-// ConstantArray - Constant Array Declarations
-//
+ 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);
- ~ConstantArray() {}
-
- virtual void destroyConstant();
+ ~ConstantArray();
public:
- static ConstantArray *get(const ArrayType *T, const std::vector<Constant*> &);
- static ConstantArray *get(const std::string &Initializer);
-
- virtual std::string getStrValue() const;
+ /// 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 (ArrayType*)Value::getType();
+ return reinterpret_cast<const ArrayType*>(Value::getType());
}
- inline const std::vector<Use> &getValues() const { return Operands; }
+ /// 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
- // getNullConstant.
+ /// 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; }
- // Methods for support type inquiry through isa, cast, and dyn_cast:
+ 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 Constant *CPV); // defined in CPV.cpp
- static inline bool classof(const Value *V) {
- return isa<Constant>(V) && classof(cast<Constant>(V));
+ 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);
- ~ConstantStruct() {}
-
- virtual void destroyConstant();
+ ~ConstantStruct();
public:
- static ConstantStruct *get(const StructType *T,
- const std::vector<Constant*> &V);
+ /// 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);
- virtual std::string getStrValue() const;
+ /// getType() specialization - Reduce amount of casting...
+ ///
inline const StructType *getType() const {
- return (StructType*)Value::getType();
+ return reinterpret_cast<const StructType*>(Value::getType());
}
- inline const std::vector<Use> &getValues() const { return Operands; }
+ /// 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;
+ }
- // isNullValue - Return true if this is the value that would be returned by
- // getNullConstant.
- 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:
+ /// 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 CPV.cpp
- static inline bool classof(const Value *V) {
- return isa<Constant>(V) && classof(cast<Constant>(V));
+ static bool classof(const Value *V) {
+ return V->getValueType() == SimpleConstantVal &&
+ V->getType()->getTypeID() == Type::StructTyID;
}
};
-//===---------------------------------------------------------------------------
-// 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
+//===----------------------------------------------------------------------===//
+/// ConstantPacked - Constant Packed Declarations
+///
+class ConstantPacked : public Constant {
+ friend struct ConstantCreator<ConstantPacked, PackedType,
+ std::vector<Constant*> >;
+ ConstantPacked(const ConstantPacked &); // DO NOT IMPLEMENT
protected:
- inline ConstantPointer(const PointerType *T) : Constant((const Type*)T){}
- ~ConstantPointer() {}
+ ConstantPacked(const PackedType *T, const std::vector<Constant*> &Val);
+ ~ConstantPacked();
public:
- virtual std::string getStrValue() const = 0;
- inline const PointerType *getType() const {
- return (PointerType*)Value::getType();
+ /// 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
- // getNullConstant.
+ /// 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; }
- // 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 CPV.cpp
- static inline bool classof(const Value *V) {
- return isa<Constant>(V) && classof(cast<Constant>(V));
+ 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 ConstantPointer {
+//===----------------------------------------------------------------------===//
+/// 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:
- inline ConstantPointerNull(const PointerType *T) : ConstantPointer(T) {}
- inline ~ConstantPointerNull() {}
+ ConstantPointerNull(const PointerType *T)
+ : Constant(reinterpret_cast<const Type*>(T),
+ Value::SimpleConstantVal, 0, 0) {}
+
public:
- virtual std::string getStrValue() const;
+ /// 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
- // getNullConstant.
+ /// isNullValue - Return true if this is the value that would be returned by
+ /// getNullValue.
virtual bool isNullValue() const { return true; }
- // 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;
- }
- static inline bool classof(const Constant *CPV) {
- return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
+ 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());
}
- static inline bool classof(const Value *V) {
- return isa<ConstantPointer>(V) && classof(cast<ConstantPointer>(V));
+
+ /// 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());
}
};
-// 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!
+/// ConstantExpr - a constant value that is initialized with an expression using
+/// other constant values.
+///
+/// This class uses the standard Instruction opcodes to define the various
+/// constant expressions. The Opcode field for the ConstantExpr class is
+/// maintained in the Value::SubclassData field.
+class ConstantExpr : public Constant {
+ friend struct ConstantCreator<ConstantExpr,Type,
+ std::pair<unsigned, std::vector<Constant*> > >;
+ friend struct ConvertConstantType<ConstantExpr, Type>;
protected:
- ConstantPointerRef(GlobalValue *GV);
- ~ConstantPointerRef() {}
+ ConstantExpr(const Type *Ty, unsigned Opcode, Use *Ops, unsigned NumOps)
+ : Constant(Ty, ConstantExprVal, Ops, NumOps) {
+ // Operation type (an Instruction opcode) is stored as the SubclassData.
+ SubclassData = Opcode;
+ }
+
+ // 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);
- virtual void destroyConstant() { destroyConstantImpl(); }
public:
- static ConstantPointerRef *get(GlobalValue *GV);
+ // 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);
+ }
- virtual std::string getStrValue() const;
+ /// getSizeOf constant expr - computes the size of a type in a target
+ /// independent way (Note: the return type is ULong but the object is not
+ /// necessarily a ConstantUInt).
+ ///
+ static Constant *getSizeOf(const Type *Ty);
+
+ /// getPtrPtrFromArrayPtr constant expr - given a pointer to a constant array,
+ /// return a pointer to a pointer of the array element type.
+ static Constant *getPtrPtrFromArrayPtr(Constant *C);
+
+ /// 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; }
- const GlobalValue *getValue() const {
- return cast<GlobalValue>(Operands[0].get());
- }
- GlobalValue *getValue() {
- return cast<GlobalValue>(Operands[0].get());
- }
+ /// getOpcode - Return the opcode at the root of this constant expression
+ unsigned getOpcode() const { return SubclassData; }
+
+ /// 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);
- // 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) {
- return CPV->getNumOperands() == 1;
+ /// Override methods to provide more type information...
+ inline Constant *getOperand(unsigned i) {
+ return cast<Constant>(User::getOperand(i));
}
- static inline bool classof(const Constant *CPV) {
- return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
+ 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 isa<ConstantPointer>(V) && classof(cast<ConstantPointer>(V));
+ return V->getValueType() == ConstantExprVal;
}
-
- // WARNING: Only to be used by Bytecode & Assembly Parsers! USER CODE SHOULD
- // NOT USE THIS!!
- void mutateReference(GlobalValue *NewGV);
- // END WARNING!!
};
+//===----------------------------------------------------------------------===//
+/// 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, 0, 0) {}
+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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