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//===- MCSectionMachO.h - MachO Machine Code Sections -----------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file declares the MCSectionMachO class.
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/MC/MCSection.h"
namespace llvm {
/// This represents a section on a Mach-O system (used by Mac OS X). On a Mac
/// system, these are also described in /usr/include/mach-o/loader.h.
class MCSectionMachO final : public MCSection {
char SegmentName[16]; // Not necessarily null terminated!
char SectionName[16]; // Not necessarily null terminated!
/// This is the SECTION_TYPE and SECTION_ATTRIBUTES field of a section, drawn
/// from the enums below.
unsigned TypeAndAttributes;
/// The 'reserved2' field of a section, used to represent the size of stubs,
/// for example.
unsigned Reserved2;
MCSectionMachO(StringRef Segment, StringRef Section, unsigned TAA,
unsigned reserved2, SectionKind K, MCSymbol *Begin);
friend class MCContext;
StringRef getSegmentName() const {
// SegmentName is not necessarily null terminated!
if (SegmentName[15])
return StringRef(SegmentName, 16);
return StringRef(SegmentName);
StringRef getSectionName() const {
// SectionName is not necessarily null terminated!
if (SectionName[15])
return StringRef(SectionName, 16);
return StringRef(SectionName);
unsigned getTypeAndAttributes() const { return TypeAndAttributes; }
unsigned getStubSize() const { return Reserved2; }
MachO::SectionType getType() const {
return static_cast<MachO::SectionType>(TypeAndAttributes &
bool hasAttribute(unsigned Value) const {
return (TypeAndAttributes & Value) != 0;
/// Parse the section specifier indicated by "Spec". This is a string that can
/// appear after a .section directive in a mach-o flavored .s file. If
/// successful, this fills in the specified Out parameters and returns an
/// empty string. When an invalid section specifier is present, this returns
/// a string indicating the problem. If no TAA was parsed, TAA is not altered,
/// and TAAWasSet becomes false.
static std::string ParseSectionSpecifier(StringRef Spec, // In.
StringRef &Segment, // Out.
StringRef &Section, // Out.
unsigned &TAA, // Out.
bool &TAAParsed, // Out.
unsigned &StubSize); // Out.
void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
raw_ostream &OS,
const MCExpr *Subsection) const override;
bool UseCodeAlign() const override;
bool isVirtualSection() const override;
static bool classof(const MCSection *S) {
return S->getVariant() == SV_MachO;
} // end namespace llvm