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| //===- lib/ReaderWriter/MachO/Atoms.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_ATOMS_H
#define LLD_READER_WRITER_MACHO_ATOMS_H
#include "lld/Core/Atom.h"
#include "lld/Core/DefinedAtom.h"
#include "lld/Core/SharedLibraryAtom.h"
#include "lld/Core/Simple.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include <cstdint>
#include <string>
namespace lld {
class File;
namespace mach_o {
class MachODefinedAtom : public SimpleDefinedAtom {
public:
MachODefinedAtom(const File &f, const StringRef name, Scope scope,
ContentType type, Merge merge, bool thumb, bool noDeadStrip,
const ArrayRef<uint8_t> content, Alignment align)
: SimpleDefinedAtom(f), _name(name), _content(content),
_align(align), _contentType(type), _scope(scope), _merge(merge),
_thumb(thumb), _noDeadStrip(noDeadStrip) {}
// Constructor for zero-fill content
MachODefinedAtom(const File &f, const StringRef name, Scope scope,
ContentType type, uint64_t size, bool noDeadStrip,
Alignment align)
: SimpleDefinedAtom(f), _name(name),
_content(ArrayRef<uint8_t>(nullptr, size)), _align(align),
_contentType(type), _scope(scope), _merge(mergeNo), _thumb(false),
_noDeadStrip(noDeadStrip) {}
~MachODefinedAtom() override = default;
uint64_t size() const override { return _content.size(); }
ContentType contentType() const override { return _contentType; }
Alignment alignment() const override { return _align; }
StringRef name() const override { return _name; }
Scope scope() const override { return _scope; }
Merge merge() const override { return _merge; }
DeadStripKind deadStrip() const override {
if (_contentType == DefinedAtom::typeInitializerPtr)
return deadStripNever;
if (_contentType == DefinedAtom::typeTerminatorPtr)
return deadStripNever;
if (_noDeadStrip)
return deadStripNever;
return deadStripNormal;
}
ArrayRef<uint8_t> rawContent() const override {
// Note: Zerofill atoms have a content pointer which is null.
return _content;
}
bool isThumb() const { return _thumb; }
private:
const StringRef _name;
const ArrayRef<uint8_t> _content;
const DefinedAtom::Alignment _align;
const ContentType _contentType;
const Scope _scope;
const Merge _merge;
const bool _thumb;
const bool _noDeadStrip;
};
class MachODefinedCustomSectionAtom : public MachODefinedAtom {
public:
MachODefinedCustomSectionAtom(const File &f, const StringRef name,
Scope scope, ContentType type, Merge merge,
bool thumb, bool noDeadStrip,
const ArrayRef<uint8_t> content,
StringRef sectionName, Alignment align)
: MachODefinedAtom(f, name, scope, type, merge, thumb, noDeadStrip,
content, align),
_sectionName(sectionName) {}
~MachODefinedCustomSectionAtom() override = default;
SectionChoice sectionChoice() const override {
return DefinedAtom::sectionCustomRequired;
}
StringRef customSectionName() const override {
return _sectionName;
}
private:
StringRef _sectionName;
};
class MachOTentativeDefAtom : public SimpleDefinedAtom {
public:
MachOTentativeDefAtom(const File &f, const StringRef name, Scope scope,
uint64_t size, DefinedAtom::Alignment align)
: SimpleDefinedAtom(f), _name(name), _scope(scope), _size(size),
_align(align) {}
~MachOTentativeDefAtom() override = default;
uint64_t size() const override { return _size; }
Merge merge() const override { return DefinedAtom::mergeAsTentative; }
ContentType contentType() const override { return DefinedAtom::typeZeroFill; }
Alignment alignment() const override { return _align; }
StringRef name() const override { return _name; }
Scope scope() const override { return _scope; }
ArrayRef<uint8_t> rawContent() const override { return ArrayRef<uint8_t>(); }
private:
const std::string _name;
const Scope _scope;
const uint64_t _size;
const DefinedAtom::Alignment _align;
};
class MachOSharedLibraryAtom : public SharedLibraryAtom {
public:
MachOSharedLibraryAtom(const File &file, StringRef name,
StringRef dylibInstallName, bool weakDef)
: SharedLibraryAtom(), _file(file), _name(name),
_dylibInstallName(dylibInstallName) {}
~MachOSharedLibraryAtom() override = default;
StringRef loadName() const override { return _dylibInstallName; }
bool canBeNullAtRuntime() const override {
// FIXME: this may actually be changeable. For now, all symbols are strongly
// defined though.
return false;
}
const File &file() const override { return _file; }
StringRef name() const override { return _name; }
Type type() const override {
// Unused in MachO (I think).
return Type::Unknown;
}
uint64_t size() const override {
// Unused in MachO (I think)
return 0;
}
private:
const File &_file;
StringRef _name;
StringRef _dylibInstallName;
};
} // end namespace mach_o
} // end namespace lld
#endif // LLD_READER_WRITER_MACHO_ATOMS_H
|