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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 https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares the MCSectionMachO class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSECTIONMACHO_H
#define LLVM_MC_MCSECTIONMACHO_H
#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!
/// 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;
// The index of this section in MachObjectWriter::SectionOrder, which is
// different from MCSection::Ordinal.
unsigned LayoutOrder = 0;
// The defining non-temporary symbol for each fragment.
SmallVector<const MCSymbol *, 0> Atoms;
MCSectionMachO(StringRef Segment, StringRef Section, unsigned TAA,
unsigned reserved2, SectionKind K, MCSymbol *Begin);
friend class MCContext;
public:
StringRef getSegmentName() const {
// SegmentName is not necessarily null terminated!
if (SegmentName[15])
return StringRef(SegmentName, 16);
return StringRef(SegmentName);
}
unsigned getTypeAndAttributes() const { return TypeAndAttributes; }
unsigned getStubSize() const { return Reserved2; }
MachO::SectionType getType() const {
return static_cast<MachO::SectionType>(TypeAndAttributes &
MachO::SECTION_TYPE);
}
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
/// an Error indicating the problem. If no TAA was parsed, TAA is not altered,
/// and TAAWasSet becomes false.
static Error 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,
uint32_t Subsection) const override;
bool useCodeAlign() const override;
void allocAtoms();
const MCSymbol *getAtom(size_t I) const;
void setAtom(size_t I, const MCSymbol *Sym);
unsigned getLayoutOrder() const { return LayoutOrder; }
void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
static bool classof(const MCSection *S) {
return S->getVariant() == SV_MachO;
}
};
} // end namespace llvm
#endif
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