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//===---- MipsABIInfo.h - Information about MIPS ABI's --------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef MIPSABIINFO_H
#define MIPSABIINFO_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/MC/MCRegisterInfo.h"

namespace llvm {

class MipsABIInfo {
public:
  enum class ABI { Unknown, O32, N32, N64, EABI };

protected:
  ABI ThisABI;

public:
  MipsABIInfo(ABI ThisABI) : ThisABI(ThisABI) {}

  static MipsABIInfo Unknown() { return MipsABIInfo(ABI::Unknown); }
  static MipsABIInfo O32() { return MipsABIInfo(ABI::O32); }
  static MipsABIInfo N32() { return MipsABIInfo(ABI::N32); }
  static MipsABIInfo N64() { return MipsABIInfo(ABI::N64); }
  static MipsABIInfo EABI() { return MipsABIInfo(ABI::EABI); }

  bool IsKnown() const { return ThisABI != ABI::Unknown; }
  bool IsO32() const { return ThisABI == ABI::O32; }
  bool IsN32() const { return ThisABI == ABI::N32; }
  bool IsN64() const { return ThisABI == ABI::N64; }
  bool IsEABI() const { return ThisABI == ABI::EABI; }
  ABI GetEnumValue() const { return ThisABI; }

  /// The registers to use for byval arguments.
  const ArrayRef<MCPhysReg> GetByValArgRegs() const;

  /// The registers to use for the variable argument list.
  const ArrayRef<MCPhysReg> GetVarArgRegs() const;

  /// Obtain the size of the area allocated by the callee for arguments.
  /// CallingConv::FastCall affects the value for O32.
  unsigned GetCalleeAllocdArgSizeInBytes(CallingConv::ID CC) const;

  /// Ordering of ABI's
  /// MipsGenSubtargetInfo.inc will use this to resolve conflicts when given
  /// multiple ABI options.
  bool operator<(const MipsABIInfo Other) const {
    return ThisABI < Other.GetEnumValue();
  }
};
}

#endif