//===-- ARMMCExpr.h - ARM specific MC expression classes --------*- C++ -*-===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H

#define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H

#include "llvm/MC/MCExpr.h"

namespace llvm_ks {

class ARMMCExpr : public MCTargetExpr {

public:

  enum VariantKind {

    VK_ARM_None,

    VK_ARM_HI16,  // The R_ARM_MOVT_ABS relocation (:upper16: in the .s file)

    VK_ARM_LO16   // The R_ARM_MOVW_ABS_NC relocation (:lower16: in the .s file)

  };

private:

  const VariantKind Kind;

  const MCExpr *Expr;

  explicit ARMMCExpr(VariantKind Kind, const MCExpr *Expr)

      : Kind(Kind), Expr(Expr) {}

public:

  /// @name Construction

  /// @{

  static const ARMMCExpr *create(VariantKind Kind, const MCExpr *Expr,

                                      MCContext &Ctx);

  static const ARMMCExpr *createUpper16(const MCExpr *Expr, MCContext &Ctx) {

    return create(VK_ARM_HI16, Expr, Ctx);

  }

  static const ARMMCExpr *createLower16(const MCExpr *Expr, MCContext &Ctx) {

    return create(VK_ARM_LO16, Expr, Ctx);

  }

  /// @}

  /// @name Accessors

  /// @{

  /// getOpcode - Get the kind of this expression.

  VariantKind getKind() const { return Kind; }

  /// getSubExpr - Get the child of this expression.

  const MCExpr *getSubExpr() const { return Expr; }

  /// @}

  void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;

  bool evaluateAsRelocatableImpl(MCValue &Res,

                                 const MCAsmLayout *Layout,

                                 const MCFixup *Fixup) const override {

    return false;

  }

  void visitUsedExpr(MCStreamer &Streamer) const override;

  MCFragment *findAssociatedFragment() const override {

    return getSubExpr()->findAssociatedFragment();

  }

  // There are no TLS ARMMCExprs at the moment.

  void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}

  static bool classof(const MCExpr *E) {

    return E->getKind() == MCExpr::Target;

  }

};

} // end namespace llvm_ks

#endif