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//===- MCSectionMachO.h - MachO Machine Code Sections -----------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file declares the MCSectionMachO class.
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCSection.h"
#include "llvm/Support/MachO.h"
namespace llvm {
/// MCSectionMachO - 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 : public MCSection {
char SegmentName[16]; // Not necessarily null terminated!
char SectionName[16]; // Not necessarily null terminated!
/// TypeAndAttributes - This is the SECTION_TYPE and SECTION_ATTRIBUTES
/// field of a section, drawn from the enums below.
unsigned TypeAndAttributes;
/// Reserved2 - 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);
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);
std::string getLabelBeginName() const override {
return StringRef(getSegmentName().str() + getSectionName().str() + "_begin");
std::string getLabelEndName() const override {
return StringRef(getSegmentName().str() + getSectionName().str() + "_end");
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;
/// ParseSectionSpecifier - 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, 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