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//===- MCSectionELF.h - ELF Machine Code Sections ---------------*- 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

//

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

//

// This file declares the MCSectionELF class.

//

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

#ifndef LLVM_MC_MCSECTIONELF_H

#define LLVM_MC_MCSECTIONELF_H

#include "llvm/ADT/PointerIntPair.h"

#include "llvm/ADT/StringRef.h"

#include "llvm/MC/MCSection.h"

#include "llvm/MC/MCSymbolELF.h"

#include "llvm/MC/SectionKind.h"

namespace llvm {

/// This represents a section on linux, lots of unix variants and some bare

/// metal systems.

class MCSectionELF final : public MCSection {

  /// This is the sh_type field of a section, drawn from the enums below.

  unsigned Type;

  /// This is the sh_flags field of a section, drawn from the enums below.

  unsigned Flags;

  unsigned UniqueID;

  /// The size of each entry in this section. This size only makes sense for

  /// sections that contain fixed-sized entries. If a section does not contain

  /// fixed-sized entries 'EntrySize' will be 0.

  unsigned EntrySize;

  /// The section group signature symbol (if not null) and a bool indicating

  /// whether this is a GRP_COMDAT group.

  const PointerIntPair<const MCSymbolELF *, 1, bool> Group;

  /// Used by SHF_LINK_ORDER. If non-null, the sh_link field will be set to the

  /// section header index of the section where LinkedToSym is defined.

  const MCSymbol *LinkedToSym;

private:

  friend class MCContext;

  // The storage of Name is owned by MCContext's ELFUniquingMap.

  MCSectionELF(StringRef Name, unsigned type, unsigned flags, SectionKind K,

               unsigned entrySize, const MCSymbolELF *group, bool IsComdat,

               unsigned UniqueID, MCSymbol *Begin,

               const MCSymbolELF *LinkedToSym)

      : MCSection(SV_ELF, Name, K, Begin), Type(type), Flags(flags),

        UniqueID(UniqueID), EntrySize(entrySize), Group(group, IsComdat),

        LinkedToSym(LinkedToSym) {

    if (Group.getPointer())

      Group.getPointer()->setIsSignature();

  }

  // TODO Delete after we stop supporting generation of GNU-style .zdebug_*

  // sections.

  void setSectionName(StringRef Name) { this->Name = Name; }

public:

  /// Decides whether a '.section' directive should be printed before the

  /// section name

  bool shouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;

  unsigned getType() const { return Type; }

  unsigned getFlags() const { return Flags; }

  unsigned getEntrySize() const { return EntrySize; }

  void setFlags(unsigned F) { Flags = F; }

  const MCSymbolELF *getGroup() const { return Group.getPointer(); }

  bool isComdat() const { return Group.getInt(); }

  void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T,

                            raw_ostream &OS,

                            const MCExpr *Subsection) const override;

  bool useCodeAlign() const override;

  bool isVirtualSection() const override;

  StringRef getVirtualSectionKind() const override;

  bool isUnique() const { return UniqueID != NonUniqueID; }

  unsigned getUniqueID() const { return UniqueID; }

  const MCSection *getLinkedToSection() const {

    return &LinkedToSym->getSection();

  }

  const MCSymbol *getLinkedToSymbol() const { return LinkedToSym; }

  static bool classof(const MCSection *S) {

    return S->getVariant() == SV_ELF;

  }

};

} // end namespace llvm

#endif // LLVM_MC_MCSECTIONELF_H