//===---- lib/ReaderWriter/MachO/SectCreateFile.h ---------------*- 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 LLD_READER_WRITER_MACHO_SECTCREATE_FILE_H

#define LLD_READER_WRITER_MACHO_SECTCREATE_FILE_H

#include "lld/Core/DefinedAtom.h"

#include "lld/Core/Simple.h"

#include "lld/ReaderWriter/MachOLinkingContext.h"

namespace lld {

namespace mach_o {

//

// A FlateNamespaceFile instance may be added as a resolution source of last

// resort, depending on how -flat_namespace and -undefined are set.

//

class SectCreateFile : public File {

public:

  class SectCreateAtom : public SimpleDefinedAtom {

  public:

    SectCreateAtom(const File &file, StringRef segName, StringRef sectName,

                   std::unique_ptr<MemoryBuffer> content)

      : SimpleDefinedAtom(file),

        _combinedName((segName + "/" + sectName).str()),

        _content(std::move(content)) {}

    ~SectCreateAtom() override = default;

    uint64_t size() const override { return _content->getBufferSize(); }

    Scope scope() const override { return scopeGlobal; }

    ContentType contentType() const override { return typeSectCreate; }

    SectionChoice sectionChoice() const override { return sectionCustomRequired; }

    StringRef customSectionName() const override { return _combinedName; }

    DeadStripKind deadStrip() const override { return deadStripNever; }

    ArrayRef<uint8_t> rawContent() const override {

      const uint8_t *data =

        reinterpret_cast<const uint8_t*>(_content->getBufferStart());

      return ArrayRef<uint8_t>(data, _content->getBufferSize());

    }

    StringRef segmentName() const { return _segName; }

    StringRef sectionName() const { return _sectName; }

  private:

    std::string _combinedName;

    StringRef _segName;

    StringRef _sectName;

    std::unique_ptr<MemoryBuffer> _content;

  };

  SectCreateFile() : File("sectcreate", kindSectCreateObject) {}

  void addSection(StringRef seg, StringRef sect,

                  std::unique_ptr<MemoryBuffer> content) {

    _definedAtoms.push_back(

      new (allocator()) SectCreateAtom(*this, seg, sect, std::move(content)));

  }

  const AtomRange<DefinedAtom> defined() const override {

    return _definedAtoms;

  }

  const AtomRange<UndefinedAtom> undefined() const override {

    return _noUndefinedAtoms;

  }

  const AtomRange<SharedLibraryAtom> sharedLibrary() const override {

    return _noSharedLibraryAtoms;

  }

  const AtomRange<AbsoluteAtom> absolute() const override {

    return _noAbsoluteAtoms;

  }

  void clearAtoms() override {

    _definedAtoms.clear();

    _noUndefinedAtoms.clear();

    _noSharedLibraryAtoms.clear();

    _noAbsoluteAtoms.clear();

  }

private:

  AtomVector<DefinedAtom> _definedAtoms;

};

} // namespace mach_o

} // namespace lld

#endif // LLD_READER_WRITER_MACHO_SECTCREATE_FILE_H