path: root/include/llvm/IR/Constants.h

//===-- llvm/Constants.h - Constant class subclass definitions --*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// @file
/// This file contains the declarations for the subclasses of Constant,
/// which represent the different flavors of constant values that live in LLVM.
/// Note that Constants are immutable (once created they never change) and are
/// fully shared by structural equivalence.  This means that two structurally
/// equivalent constants will always have the same address.  Constant's are
/// created on demand as needed and never deleted: thus clients don't have to
/// worry about the lifetime of the objects.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_IR_CONSTANTS_H
#define LLVM_IR_CONSTANTS_H

#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/OperandTraits.h"
#include "llvm/IR/DerivedTypes.h"

namespace llvm {

class ArrayType;
class IntegerType;
class StructType;
class PointerType;
class VectorType;
class SequentialType;

template<class ConstantClass, class TypeClass, class ValType>
struct ConstantCreator;
template<class ConstantClass, class TypeClass>
struct ConstantArrayCreator;
template<class ConstantClass, class TypeClass>
struct ConvertConstantType;

//===----------------------------------------------------------------------===//
/// This is the shared class of boolean and integer constants. This class
/// represents both boolean and integral constants.
/// @brief Class for constant integers.
class ConstantInt : public Constant {
  virtual void anchor();
  void *operator new(size_t, unsigned) LLVM_DELETED_FUNCTION;
  ConstantInt(const ConstantInt &) LLVM_DELETED_FUNCTION;
  ConstantInt(IntegerType *Ty, const APInt& V);
  APInt Val;
protected:
  // allocate space for exactly zero operands
  void *operator new(size_t s) {
    return User::operator new(s, 0);
  }
public:
  static ConstantInt *getTrue(LLVMContext &Context);
  static ConstantInt *getFalse(LLVMContext &Context);
  static Constant *getTrue(Type *Ty);
  static Constant *getFalse(Type *Ty);

  /// If Ty is a vector type, return a Constant with a splat of the given
  /// value. Otherwise return a ConstantInt for the given value.
  static Constant *get(Type *Ty, uint64_t V, bool isSigned = false);

  /// Return a ConstantInt with the specified integer value for the specified
  /// type. If the type is wider than 64 bits, the value will be zero-extended
  /// to fit the type, unless isSigned is true, in which case the value will
  /// be interpreted as a 64-bit signed integer and sign-extended to fit
  /// the type.
  /// @brief Get a ConstantInt for a specific value.
  static ConstantInt *get(IntegerType *Ty, uint64_t V,
                          bool isSigned = false);

  /// Return a ConstantInt with the specified value for the specified type. The
  /// value V will be canonicalized to a an unsigned APInt. Accessing it with
  /// either getSExtValue() or getZExtValue() will yield a correctly sized and
  /// signed value for the type Ty.
  /// @brief Get a ConstantInt for a specific signed value.
  static ConstantInt *getSigned(IntegerType *Ty, int64_t V);
  static Constant *getSigned(Type *Ty, int64_t V);

  /// Return a ConstantInt with the specified value and an implied Type. The
  /// type is the integer type that corresponds to the bit width of the value.
  static ConstantInt *get(LLVMContext &Context, const APInt &V);

  /// Return a ConstantInt constructed from the string strStart with the given
  /// radix.
  static ConstantInt *get(IntegerType *Ty, StringRef Str,
                          uint8_t radix);

  /// If Ty is a vector type, return a Constant with a splat of the given
  /// value. Otherwise return a ConstantInt for the given value.
  static Constant *get(Type* Ty, const APInt& V);

  /// Return the constant as an APInt value reference. This allows clients to
  /// obtain a copy of the value, with all its precision in tact.
  /// @brief Return the constant's value.
  inline const APInt &getValue() const {
    return Val;
  }

  /// getBitWidth - Return the bitwidth of this constant.
  unsigned getBitWidth() const { return Val.getBitWidth(); }

  /// Return the constant as a 64-bit unsigned integer value after it
  /// has been zero extended as appropriate for the type of this constant. Note
  /// that this method can assert if the value does not fit in 64 bits.
  /// @deprecated
  /// @brief Return the zero extended value.
  inline uint64_t getZExtValue() const {
    return Val</