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| //===- MCSectionELF.h - ELF 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 MCSectionELF class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSECTIONELF_H
#define LLVM_MC_MCSECTIONELF_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/SectionKind.h"
namespace llvm {
class MCSymbol;
/// This represents a section on linux, lots of unix variants and some bare
/// metal systems.
class MCSectionELF final : public MCSection {
/// This is the name of the section. The referenced memory is owned by
/// TargetLoweringObjectFileELF's ELFUniqueMap.
StringRef SectionName;
/// This is the sh_type field of a section, drawn from the enums below.
unsigned Type;
/// This is the sh_flags field of a section, drawn from the enums below.
unsigned Flags;
unsigned UniqueID;
/// The size of each entry in this section. This size only makes sense for
/// sections that contain fixed-sized entries. If a section does not contain
/// fixed-sized entries 'EntrySize' will be 0.
unsigned EntrySize;
const MCSymbolELF *Group;
/// sh_info for SHF_LINK_ORDER (can be null).
const MCSymbol *AssociatedSymbol;
private:
friend class MCContext;
MCSectionELF(StringRef Section, unsigned type, unsigned flags, SectionKind K,
unsigned entrySize, const MCSymbolELF *group, unsigned UniqueID,
MCSymbol *Begin, const MCSymbolELF *AssociatedSymbol)
: MCSection(SV_ELF, K, Begin), SectionName(Section), Type(type),
Flags(flags), UniqueID(UniqueID), EntrySize(entrySize), Group(group),
AssociatedSymbol(AssociatedSymbol) {
if (Group)
Group->setIsSignature();
}
void setSectionName(StringRef Name) { SectionName = Name; }
public:
/// Decides whether a '.section' directive should be printed before the
/// section name
bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
StringRef getSectionName() const { return SectionName; }
unsigned getType() const { return Type; }
unsigned getFlags() const { return Flags; }
unsigned getEntrySize() const { return EntrySize; }
void setFlags(unsigned F) { Flags = F; }
const MCSymbolELF *getGroup() const { return Group; }
void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
raw_ostream &OS,
const MCExpr *Subsection) const override;
bool UseCodeAlign() const override;
bool isVirtualSection() const override;
bool isUnique() const { return UniqueID != ~0U; }
unsigned getUniqueID() const { return UniqueID; }
const MCSection *getAssociatedSection() const { return &AssociatedSymbol->getSection(); }
const MCSymbol *getAssociatedSymbol() const { return AssociatedSymbol; }
static bool classof(const MCSection *S) {
return S->getVariant() == SV_ELF;
}
};
} // end namespace llvm
#endif // LLVM_MC_MCSECTIONELF_H
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