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647 lines
26 KiB
C++
647 lines
26 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 PackedType;
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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 superclass of boolean and integer constants. This class
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/// just defines some common interfaces to be implemented by the subclasses.
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/// @brief An abstract class for integer constants.
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class ConstantIntegral : public Constant {
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protected:
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uint64_t Val;
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ConstantIntegral(const Type *Ty, ValueTy VT, uint64_t V);
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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 = getType()->getPrimitiveSizeInBits();
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return (int64_t(Val) << (64-Size)) >> (64-Size);
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}
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/// This function is implemented by subclasses and will return true iff this
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/// constant represents the the "null" value that would be returned by the
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/// getNullValue method.
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/// @returns true if the constant's value is 0.
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/// @brief Determine if the value is null.
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virtual bool isNullValue() const = 0;
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/// This function is implemented by sublcasses and will return true iff this
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/// constant represents the the largest value that may be represented by this
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/// constant's type.
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/// @returns true if the constant's value is maximal.
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/// @brief Determine if the value is maximal.
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virtual bool isMaxValue() const = 0;
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/// This function is implemented by subclasses and will return true iff this
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/// constant represents the smallest value that may be represented by this
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/// constant's type.
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/// @returns true if the constant's value is minimal
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/// @brief Determine if the value is minimal.
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virtual bool isMinValue() const = 0;
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/// This function is implemented by subclasses and will return true iff every
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/// bit in this constant is set to true.
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/// @returns true if all bits of the constant are ones.
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/// @brief Determine if the value is all ones.
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virtual bool isAllOnesValue() const = 0;
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/// @returns the largest value for an integer constant of the given type
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/// @brief Get the maximal value
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static ConstantIntegral *getMaxValue(const Type *Ty);
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/// @returns the smallest value for an integer constant of the given type
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/// @brief Get the minimal value
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static ConstantIntegral *getMinValue(const Type *Ty);
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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 ConstantIntegral *getAllOnesValue(const Type *Ty);
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/// Methods to support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantIntegral *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantBoolVal ||
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V->getValueType() == ConstantIntVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// This concrete class represents constant values of type BoolTy. There are
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/// only two instances of this class constructed: the True and False static
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/// members. The constructor is hidden to ensure this invariant.
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/// @brief Constant Boolean class
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class ConstantBool : public ConstantIntegral {
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ConstantBool(bool V);
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public:
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/// getTrue/getFalse - Return the singleton true/false values.
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static ConstantBool *getTrue();
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static ConstantBool *getFalse();
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/// This method is provided mostly for compatibility with the other
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/// ConstantIntegral subclasses.
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/// @brief Static factory method for getting a ConstantBool instance.
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static ConstantBool *get(bool Value) { return Value ? getTrue() : getFalse();}
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/// This method is provided mostly for compatibility with the other
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/// ConstantIntegral subclasses.
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/// @brief Static factory method for getting a ConstantBool instance.
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static ConstantBool *get(const Type *Ty, bool Value) { return get(Value); }
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/// Returns the opposite value of this ConstantBool value.
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/// @brief Get inverse value.
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inline ConstantBool *inverted() const {
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return getValue() ? getFalse() : getTrue();
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}
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/// @returns the value of this ConstantBool
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/// @brief return the boolean value of this constant.
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inline bool getValue() const { return static_cast<bool>(getZExtValue()); }
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/// @see ConstantIntegral for details
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/// @brief Implement overrides
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virtual bool isNullValue() const { return getValue() == false; }
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virtual bool isMaxValue() const { return getValue() == true; }
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virtual bool isMinValue() const { return getValue() == false; }
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virtual bool isAllOnesValue() const { return getValue() == true; }
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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 ConstantBool *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantBoolVal;
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}
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};
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//===----------------------------------------------------------------------===//
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/// This is concrete integer subclass of ConstantIntegral that represents
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/// both signed and unsigned integral constants, other than boolean.
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/// @brief Class for constant integers.
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class ConstantInt : public ConstantIntegral {
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protected:
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ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
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ConstantInt(const Type *Ty, uint64_t V);
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ConstantInt(const Type *Ty, int64_t V);
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friend struct ConstantCreator<ConstantInt, Type, uint64_t>;
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public:
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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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/// 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() (ConstantIntegral) 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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/// 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.
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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, int64_t V);
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/// @returns true if this is the null integer value.
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/// @see ConstantIntegral for details
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/// @brief Implement override.
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virtual bool isNullValue() const { return Val == 0; }
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/// @returns true iff this constant's bits are all set to true.
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/// @see ConstantIntegral
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/// @brief Override implementation
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virtual bool isAllOnesValue() const { return getSExtValue() == -1; }
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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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/// @see ConstantIntegeral
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/// @brief Override implementation
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virtual bool isMaxValue() const {
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if (getType()->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(getType(), V) || V < 0;
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}
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return isAllOnesValue();
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}
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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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/// @see ConstantIntegral
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/// @brief Override implementation
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virtual bool isMinValue() const {
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if (getType()->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(getType(), V) || V > 0;
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}
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return getZExtValue() == 0;
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}
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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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};
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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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friend struct ConstantCreator<ConstantFP, Type, uint64_t>;
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friend struct ConstantCreator<ConstantFP, Type, uint32_t>;
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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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/// 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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/// 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);
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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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/// ConstantPacked - Constant Packed Declarations
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///
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class ConstantPacked : public Constant {
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friend struct ConstantCreator<ConstantPacked, PackedType,
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std::vector<Constant*> >;
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ConstantPacked(const ConstantPacked &); // DO NOT IMPLEMENT
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protected:
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ConstantPacked(const PackedType *T, const std::vector<Constant*> &Val);
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~ConstantPacked();
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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 PackedType *T, const std::vector<Constant*> &);
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static Constant *get(const std::vector<Constant*> &V);
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/// getType - Specialize the getType() method to always return an PackedType,
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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 PackedType *getType() const {
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return reinterpret_cast<const PackedType*>(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 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 ConstantPacked *) { return true; }
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantPackedVal;
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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 *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);
|
|
static Constant *getExtractElementTy(const Type *Ty, Constant *Val,
|
|
Constant *Idx);
|
|
static Constant *getInsertElementTy(const Type *Ty, Constant *Val,
|
|
Constant *Elt, Constant *Idx);
|
|
static Constant *getShuffleVectorTy(const Type *Ty, Constant *V1,
|
|
Constant *V2, Constant *Mask);
|
|
|
|
public:
|
|
// Static methods to construct a ConstantExpr of different kinds. Note that
|
|
// these methods may return a object that is not an instance of the
|
|
// ConstantExpr class, because they will attempt to fold the constant
|
|
// expression into something simpler if possible.
|
|
|
|
/// Cast constant expr
|
|
///
|
|
static Constant *getCast(Constant *C, const Type *Ty);
|
|
static Constant *getSignExtend(Constant *C, const Type *Ty);
|
|
static Constant *getZeroExtend(Constant *C, const Type *Ty);
|
|
|
|
/// Select constant expr
|
|
///
|
|
static Constant *getSelect(Constant *C, Constant *V1, Constant *V2) {
|
|
return getSelectTy(V1->getType(), C, V1, V2);
|
|
}
|
|
|
|
/// getSizeOf constant expr - computes the size of a type in a target
|
|
/// independent way (Note: the return type is a ULong).
|
|
///
|
|
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);
|
|
|
|
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);
|
|
|
|
/// 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; }
|
|
|
|
/// 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
|