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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34447 91177308-0d34-0410-b5e6-96231b3b80d8
672 lines
27 KiB
C++
672 lines
27 KiB
C++
//===-- llvm/Constants.h - Constant class subclass definitions --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// @file This file contains the declarations for the subclasses of Constant,
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/// which represent the different flavors of constant values that live in LLVM.
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/// Note that Constants are immutable (once created they never change) and are
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/// fully shared by structural equivalence. This means that two structurally
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/// equivalent constants will always have the same address. Constant's are
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/// created on demand as needed and never deleted: thus clients don't have to
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/// worry about the lifetime of the objects.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CONSTANTS_H
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#define LLVM_CONSTANTS_H
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#include "llvm/Constant.h"
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#include "llvm/Type.h"
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namespace llvm {
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class ArrayType;
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class StructType;
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class PointerType;
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class VectorType;
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template<class ConstantClass, class TypeClass, class ValType>
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struct ConstantCreator;
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template<class ConstantClass, class TypeClass>
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struct ConvertConstantType;
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//===----------------------------------------------------------------------===//
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/// This is the shared class of boolean and integer constants. This class
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/// represents both boolean and integral constants.
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/// @brief Class for constant integers.
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class ConstantInt : public Constant {
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static ConstantInt *TheTrueVal, *TheFalseVal;
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ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
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ConstantInt(const IntegerType *Ty, uint64_t V);
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uint64_t Val;
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public:
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/// Return the constant as a 64-bit unsigned integer value after it
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/// has been zero extended as appropriate for the type of this constant.
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/// @brief Return the zero extended value.
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inline uint64_t getZExtValue() const {
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return Val;
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}
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/// Return the constant as a 64-bit integer value after it has been sign
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/// sign extended as appropriate for the type of this constant.
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/// @brief Return the sign extended value.
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inline int64_t getSExtValue() const {
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unsigned Size = Value::getType()->getPrimitiveSizeInBits();
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return (int64_t(Val) << (64-Size)) >> (64-Size);
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}
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/// A helper method that can be used to determine if the constant contained
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/// within is equal to a constant. This only works for very small values,
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/// because this is all that can be represented with all types.
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/// @brief Determine if this constant's value is same as an unsigned char.
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bool equalsInt(unsigned char V) const {
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assert(V <= 127 &&
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"equalsInt: Can only be used with very small positive constants!");
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return Val == V;
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}
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/// getTrue/getFalse - Return the singleton true/false values.
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static inline ConstantInt *getTrue() {
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if (TheTrueVal) return TheTrueVal;
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return CreateTrueFalseVals(true);
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}
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static inline ConstantInt *getFalse() {
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if (TheFalseVal) return TheFalseVal;
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return CreateTrueFalseVals(false);
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}
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/// Return a ConstantInt with the specified value for the specified type. The
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/// value V will be canonicalized to a uint64_t but accessing it with either
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/// getSExtValue() or getZExtValue() (ConstantInt) will yield the correct
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/// sized/signed value for the type Ty.
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/// @brief Get a ConstantInt for a specific value.
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static ConstantInt *get(const Type *Ty, int64_t V);
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/// getType - Specialize the getType() method to always return an IntegerType,
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/// which reduces the amount of casting needed in parts of the compiler.
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///
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inline const IntegerType *getType() const {
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return reinterpret_cast<const IntegerType*>(Value::getType());
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}
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/// This static method returns true if the type Ty is big enough to
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/// represent the value V. This can be used to avoid having the get method
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/// assert when V is larger than Ty can represent. Note that there are two
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/// versions of this method, one for unsigned and one for signed integers.
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/// Although ConstantInt canonicalizes everything to an unsigned integer,
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/// the signed version avoids callers having to convert a signed quantity
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/// to the appropriate unsigned type before calling the method.
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/// @returns true if V is a valid value for type Ty
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/// @brief Determine if the value is in range for the given type.
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static bool isValueValidForType(const Type *Ty, uint64_t V);
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static bool isValueValidForType(const Type *Ty, int64_t V);
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/// This function will return true iff this constant represents the "null"
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/// value that would be returned by the getNullValue method.
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/// @returns true if this is the null integer value.
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/// @brief Determine if the value is null.
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virtual bool isNullValue() const {
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return Val == 0;
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}
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/// This function will return true iff every bit in this constant is set
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/// to true.
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/// @returns true iff this constant's bits are all set to true.
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/// @brief Determine if the value is all ones.
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bool isAllOnesValue() const {
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return getSExtValue() == -1;
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}
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/// This function will return true iff this constant represents the largest
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/// value that may be represented by the constant's type.
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/// @returns true iff this is the largest value that may be represented
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/// by this type.
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/// @brief Determine if the value is maximal.
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bool isMaxValue(bool isSigned) const {
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if (isSigned) {
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int64_t V = getSExtValue();
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if (V < 0) return false; // Be careful about wrap-around on 'long's
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++V;
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return !isValueValidForType(Value::getType(), V) || V < 0;
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}
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return isAllOnesValue();
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}
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/// This function will return true iff this constant represents the smallest
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/// value that may be represented by this constant's type.
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/// @returns true if this is the smallest value that may be represented by
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/// this type.
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/// @brief Determine if the value is minimal.
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bool isMinValue(bool isSigned) const {
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if (isSigned) {
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int64_t V = getSExtValue();
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if (V > 0) return false; // Be careful about wrap-around on 'long's
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--V;
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return !isValueValidForType(Value::getType(), V) || V > 0;
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}
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return getZExtValue() == 0;
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}
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/// @returns the value for an integer constant of the given type that has all
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/// its bits set to true.
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/// @brief Get the all ones value
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static ConstantInt *getAllOnesValue(const Type *Ty);
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/// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
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static inline bool classof(const ConstantInt *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantIntVal;
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}
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static void ResetTrueFalse() { TheTrueVal = TheFalseVal = 0; }
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private:
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static ConstantInt *CreateTrueFalseVals(bool WhichOne);
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};
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//===----------------------------------------------------------------------===//
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/// ConstantFP - Floating Point Values [float, double]
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///
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class ConstantFP : public Constant {
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double Val;
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ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
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protected:
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ConstantFP(const Type *Ty, double V);
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public:
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/// get() - Static factory methods - Return objects of the specified value
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static ConstantFP *get(const Type *Ty, double V);
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/// isValueValidForType - return true if Ty is big enough to represent V.
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static bool isValueValidForType(const Type *Ty, double V);
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inline double getValue() const { return Val; }
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue. Don't depend on == for doubles to tell us it's zero, it
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/// considers -0.0 to be null as well as 0.0. :(
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virtual bool isNullValue() const;
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/// isExactlyValue - We don't rely on operator== working on double values, as
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/// it returns true for things that are clearly not equal, like -0.0 and 0.0.
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/// As such, this method can be used to do an exact bit-for-bit comparison of
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/// two floating point values.
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bool isExactlyValue(double V) const;
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantFP *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantFPVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// ConstantAggregateZero - All zero aggregate value
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///
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class ConstantAggregateZero : public Constant {
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friend struct ConstantCreator<ConstantAggregateZero, Type, char>;
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ConstantAggregateZero(const ConstantAggregateZero &); // DO NOT IMPLEMENT
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protected:
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ConstantAggregateZero(const Type *Ty)
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: Constant(Ty, ConstantAggregateZeroVal, 0, 0) {}
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public:
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/// get() - static factory method for creating a null aggregate. It is
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/// illegal to call this method with a non-aggregate type.
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static Constant *get(const Type *Ty);
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue.
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virtual bool isNullValue() const { return true; }
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virtual void destroyConstant();
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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///
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static bool classof(const ConstantAggregateZero *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantAggregateZeroVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// ConstantArray - Constant Array Declarations
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///
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class ConstantArray : public Constant {
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friend struct ConstantCreator<ConstantArray, ArrayType,
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std::vector<Constant*> >;
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ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
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protected:
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ConstantArray(const ArrayType *T, const std::vector<Constant*> &Val);
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~ConstantArray();
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public:
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/// get() - Static factory methods - Return objects of the specified value
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static Constant *get(const ArrayType *T, const std::vector<Constant*> &);
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static Constant *get(const ArrayType *T,
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Constant*const*Vals, unsigned NumVals) {
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// FIXME: make this the primary ctor method.
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return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
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}
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/// This method constructs a ConstantArray and initializes it with a text
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/// string. The default behavior (AddNull==true) causes a null terminator to
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/// be placed at the end of the array. This effectively increases the length
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/// of the array by one (you've been warned). However, in some situations
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/// this is not desired so if AddNull==false then the string is copied without
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/// null termination.
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static Constant *get(const std::string &Initializer, bool AddNull = true);
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/// getType - Specialize the getType() method to always return an ArrayType,
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/// which reduces the amount of casting needed in parts of the compiler.
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///
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inline const ArrayType *getType() const {
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return reinterpret_cast<const ArrayType*>(Value::getType());
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}
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/// isString - This method returns true if the array is an array of sbyte or
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/// ubyte, and if the elements of the array are all ConstantInt's.
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bool isString() const;
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/// isCString - This method returns true if the array is a string (see
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/// isString) and it ends in a null byte \0 and does not contains any other
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/// null bytes except its terminator.
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bool isCString() const;
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/// getAsString - If this array is isString(), then this method converts the
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/// array to an std::string and returns it. Otherwise, it asserts out.
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///
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std::string getAsString() const;
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue. This always returns false because zero arrays are always
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/// created as ConstantAggregateZero objects.
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virtual bool isNullValue() const { return false; }
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virtual void destroyConstant();
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantArray *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantArrayVal;
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}
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};
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//===----------------------------------------------------------------------===//
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// ConstantStruct - Constant Struct Declarations
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//
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class ConstantStruct : public Constant {
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friend struct ConstantCreator<ConstantStruct, StructType,
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std::vector<Constant*> >;
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ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
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protected:
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ConstantStruct(const StructType *T, const std::vector<Constant*> &Val);
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~ConstantStruct();
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public:
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/// get() - Static factory methods - Return objects of the specified value
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///
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static Constant *get(const StructType *T, const std::vector<Constant*> &V);
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static Constant *get(const std::vector<Constant*> &V, bool Packed = false);
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static Constant *get(Constant*const* Vals, unsigned NumVals,
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bool Packed = false) {
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// FIXME: make this the primary ctor method.
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return get(std::vector<Constant*>(Vals, Vals+NumVals), Packed);
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}
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/// getType() specialization - Reduce amount of casting...
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///
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inline const StructType *getType() const {
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return reinterpret_cast<const StructType*>(Value::getType());
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}
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue. This always returns false because zero structs are always
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/// created as ConstantAggregateZero objects.
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virtual bool isNullValue() const {
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return false;
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}
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virtual void destroyConstant();
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantStruct *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantStructVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// ConstantVector - Constant Vector Declarations
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///
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class ConstantVector : public Constant {
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friend struct ConstantCreator<ConstantVector, VectorType,
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std::vector<Constant*> >;
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ConstantVector(const ConstantVector &); // DO NOT IMPLEMENT
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protected:
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ConstantVector(const VectorType *T, const std::vector<Constant*> &Val);
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~ConstantVector();
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public:
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/// get() - Static factory methods - Return objects of the specified value
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static Constant *get(const VectorType *T, const std::vector<Constant*> &);
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static Constant *get(const std::vector<Constant*> &V);
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static Constant *get(Constant*const* Vals, unsigned NumVals) {
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// FIXME: make this the primary ctor method.
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return get(std::vector<Constant*>(Vals, Vals+NumVals));
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}
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/// getType - Specialize the getType() method to always return an VectorType,
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/// which reduces the amount of casting needed in parts of the compiler.
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///
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inline const VectorType *getType() const {
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return reinterpret_cast<const VectorType*>(Value::getType());
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}
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/// @returns the value for an packed integer constant of the given type that
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/// has all its bits set to true.
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/// @brief Get the all ones value
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static ConstantVector *getAllOnesValue(const VectorType *Ty);
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue. This always returns false because zero arrays are always
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/// created as ConstantAggregateZero objects.
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virtual bool isNullValue() const { return false; }
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/// This function will return true iff every element in this packed constant
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/// is set to all ones.
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/// @returns true iff this constant's emements are all set to all ones.
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/// @brief Determine if the value is all ones.
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bool isAllOnesValue() const;
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virtual void destroyConstant();
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantVector *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantVectorVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// ConstantPointerNull - a constant pointer value that points to null
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///
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class ConstantPointerNull : public Constant {
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friend struct ConstantCreator<ConstantPointerNull, PointerType, char>;
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ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
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protected:
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ConstantPointerNull(const PointerType *T)
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: Constant(reinterpret_cast<const Type*>(T),
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Value::ConstantPointerNullVal, 0, 0) {}
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public:
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/// get() - Static factory methods - Return objects of the specified value
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static ConstantPointerNull *get(const PointerType *T);
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue.
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virtual bool isNullValue() const { return true; }
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virtual void destroyConstant();
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/// getType - Specialize the getType() method to always return an PointerType,
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/// which reduces the amount of casting needed in parts of the compiler.
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///
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inline const PointerType *getType() const {
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return reinterpret_cast<const PointerType*>(Value::getType());
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}
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantPointerNull *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantPointerNullVal;
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}
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};
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/// ConstantExpr - a constant value that is initialized with an expression using
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/// other constant values.
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///
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/// This class uses the standard Instruction opcodes to define the various
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/// constant expressions. The Opcode field for the ConstantExpr class is
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/// maintained in the Value::SubclassData field.
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class ConstantExpr : public Constant {
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friend struct ConstantCreator<ConstantExpr,Type,
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std::pair<unsigned, std::vector<Constant*> > >;
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friend struct ConvertConstantType<ConstantExpr, Type>;
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protected:
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ConstantExpr(const Type *Ty, unsigned Opcode, Use *Ops, unsigned NumOps)
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: Constant(Ty, ConstantExprVal, Ops, NumOps) {
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// Operation type (an Instruction opcode) is stored as the SubclassData.
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SubclassData = Opcode;
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}
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// These private methods are used by the type resolution code to create
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// ConstantExprs in intermediate forms.
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static Constant *getTy(const Type *Ty, unsigned Opcode,
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Constant *C1, Constant *C2);
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static Constant *getCompareTy(unsigned short pred, Constant *C1,
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Constant *C2);
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static Constant *getSelectTy(const Type *Ty,
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Constant *C1, Constant *C2, Constant *C3);
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static Constant *getGetElementPtrTy(const Type *Ty, Constant *C,
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Value* const *Idxs, unsigned NumIdxs);
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static Constant *getExtractElementTy(const Type *Ty, Constant *Val,
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Constant *Idx);
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static Constant *getInsertElementTy(const Type *Ty, Constant *Val,
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Constant *Elt, Constant *Idx);
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static Constant *getShuffleVectorTy(const Type *Ty, Constant *V1,
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Constant *V2, Constant *Mask);
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public:
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// Static methods to construct a ConstantExpr of different kinds. Note that
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// these methods may return a object that is not an instance of the
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// ConstantExpr class, because they will attempt to fold the constant
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// expression into something simpler if possible.
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/// Cast constant expr
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///
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static Constant *getTrunc (Constant *C, const Type *Ty);
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static Constant *getSExt (Constant *C, const Type *Ty);
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static Constant *getZExt (Constant *C, const Type *Ty);
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static Constant *getFPTrunc (Constant *C, const Type *Ty);
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static Constant *getFPExtend(Constant *C, const Type *Ty);
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static Constant *getUIToFP (Constant *C, const Type *Ty);
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static Constant *getSIToFP (Constant *C, const Type *Ty);
|
|
static Constant *getFPToUI (Constant *C, const Type *Ty);
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|
static Constant *getFPToSI (Constant *C, const Type *Ty);
|
|
static Constant *getPtrToInt(Constant *C, const Type *Ty);
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|
static Constant *getIntToPtr(Constant *C, const Type *Ty);
|
|
static Constant *getBitCast (Constant *C, const Type *Ty);
|
|
|
|
// @brief Convenience function for getting one of the casting operations
|
|
// using a CastOps opcode.
|
|
static Constant *getCast(
|
|
unsigned ops, ///< The opcode for the conversion
|
|
Constant *C, ///< The constant to be converted
|
|
const Type *Ty ///< The type to which the constant is converted
|
|
);
|
|
|
|
// @brief Create a ZExt or BitCast cast constant expression
|
|
static Constant *getZExtOrBitCast(
|
|
Constant *C, ///< The constant to zext or bitcast
|
|
const Type *Ty ///< The type to zext or bitcast C to
|
|
);
|
|
|
|
// @brief Create a SExt or BitCast cast constant expression
|
|
static Constant *getSExtOrBitCast(
|
|
Constant *C, ///< The constant to sext or bitcast
|
|
const Type *Ty ///< The type to sext or bitcast C to
|
|
);
|
|
|
|
// @brief Create a Trunc or BitCast cast constant expression
|
|
static Constant *getTruncOrBitCast(
|
|
Constant *C, ///< The constant to trunc or bitcast
|
|
const Type *Ty ///< The type to trunc or bitcast C to
|
|
);
|
|
|
|
/// @brief Create a BitCast or a PtrToInt cast constant expression
|
|
static Constant *getPointerCast(
|
|
Constant *C, ///< The pointer value to be casted (operand 0)
|
|
const Type *Ty ///< The type to which cast should be made
|
|
);
|
|
|
|
/// @brief Create a ZExt, Bitcast or Trunc for integer -> integer casts
|
|
static Constant *getIntegerCast(
|
|
Constant *C, ///< The integer constant to be casted
|
|
const Type *Ty, ///< The integer type to cast to
|
|
bool isSigned ///< Whether C should be treated as signed or not
|
|
);
|
|
|
|
/// @brief Create a FPExt, Bitcast or FPTrunc for fp -> fp casts
|
|
static Constant *getFPCast(
|
|
Constant *C, ///< The integer constant to be casted
|
|
const Type *Ty ///< The integer type to cast to
|
|
);
|
|
|
|
/// @brief Return true if this is a convert constant expression
|
|
bool isCast() const;
|
|
|
|
/// @brief Return true if this is a compare constant expression
|
|
bool isCompare() const;
|
|
|
|
/// 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 is a ULong).
|
|
///
|
|
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);
|
|
|
|
/// @brief Return an ICmp or FCmp comparison operator constant expression.
|
|
static Constant *getCompare(unsigned short pred, 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 *getUDiv(Constant *C1, Constant *C2);
|
|
static Constant *getSDiv(Constant *C1, Constant *C2);
|
|
static Constant *getFDiv(Constant *C1, Constant *C2);
|
|
static Constant *getURem(Constant *C1, Constant *C2); // unsigned rem
|
|
static Constant *getSRem(Constant *C1, Constant *C2); // signed rem
|
|
static Constant *getFRem(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* getICmp(unsigned short pred, Constant* LHS, Constant* RHS);
|
|
static Constant* getFCmp(unsigned short pred, Constant* LHS, Constant* RHS);
|
|
static Constant *getShl(Constant *C1, Constant *C2);
|
|
static Constant *getLShr(Constant *C1, Constant *C2);
|
|
static Constant *getAShr(Constant *C1, Constant *C2);
|
|
|
|
/// Getelementptr form. std::vector<Value*> is only accepted for convenience:
|
|
/// all elements must be Constant's.
|
|
///
|
|
static Constant *getGetElementPtr(Constant *C,
|
|
Constant* const *IdxList, unsigned NumIdx);
|
|
static Constant *getGetElementPtr(Constant *C,
|
|
Value* const *IdxList, unsigned NumIdx);
|
|
|
|
static Constant *getExtractElement(Constant *Vec, Constant *Idx);
|
|
static Constant *getInsertElement(Constant *Vec, Constant *Elt,Constant *Idx);
|
|
static Constant *getShuffleVector(Constant *V1, Constant *V2, Constant *Mask);
|
|
|
|
/// Floating point negation must be implemented with f(x) = -0.0 - x. This
|
|
/// method returns the negative zero constant for floating point or packed
|
|
/// floating point types; for all other types, it returns the null value.
|
|
static Constant *getZeroValueForNegationExpr(const Type *Ty);
|
|
|
|
/// 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 SubclassData; }
|
|
|
|
/// getPredicate - Return the ICMP or FCMP predicate value. Assert if this is
|
|
/// not an ICMP or FCMP constant expression.
|
|
unsigned getPredicate() const;
|
|
|
|
/// getOpcodeName - Return a string representation for an opcode.
|
|
const char *getOpcodeName() const;
|
|
|
|
/// getWithOperandReplaced - Return a constant expression identical to this
|
|
/// one, but with the specified operand set to the specified value.
|
|
Constant *getWithOperandReplaced(unsigned OpNo, Constant *Op) const;
|
|
|
|
/// getWithOperands - This returns the current constant expression with the
|
|
/// operands replaced with the specified values. The specified operands must
|
|
/// match count and type with the existing ones.
|
|
Constant *getWithOperands(const std::vector<Constant*> &Ops) const;
|
|
|
|
virtual void destroyConstant();
|
|
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
|
|
|
|
/// 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, 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
|