SystemZMCExpr.h

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//===-- SystemZMCExpr.h - SystemZ specific MC expression classes -*- C++-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_SYSTEMZ_MCTARGETDESC_SYSTEMZMCEXPR_H
#define LLVM_LIB_TARGET_SYSTEMZ_MCTARGETDESC_SYSTEMZMCEXPR_H
 
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCValue.h"
 
namespace llvm {
 
class SystemZMCExpr : public MCTargetExpr {
public:
// HLASM docs for address constants:
// https://www.ibm.com/docs/en/hla-and-tf/1.6?topic=value-address-constants
  enum VariantKind {
    VK_SystemZ_None,
    VK_SystemZ_RCon,            // Address of ADA of symbol.
    VK_SystemZ_VCon,            // Address of external function symbol.
  };
 
private:
  const VariantKind Kind;
  const MCExpr *Expr;
 
  explicit SystemZMCExpr(VariantKind Kind, const MCExpr *Expr)
      : Kind(Kind), Expr(Expr) {}
 
public:
  static const SystemZMCExpr *create(VariantKind Kind, const MCExpr *Expr,
                                     MCContext &Ctx);
 
  /// 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; }
 
  StringRef getVariantKindName() const;
 
  void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
  bool evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
                                 const MCFixup *Fixup) const override;
  void visitUsedExpr(MCStreamer &Streamer) const override {
    Streamer.visitUsedExpr(*getSubExpr());
  }
  MCFragment *findAssociatedFragment() const override {
    return getSubExpr()->findAssociatedFragment();
  }
 
  // There are no TLS SystemZMCExprs at the moment.
  void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
 
  static bool classof(const MCExpr *E) {
    return E->getKind() == MCExpr::Target;
  }
};
} // end namespace llvm
 
#endif