//===- 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 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; /// Used by SHF_LINK_ORDER. If non-null, the sh_link field will be set to the /// section header index of the section where LinkedToSym is defined. const MCSymbol *LinkedToSym; private: friend class MCContext; // The storage of Name is owned by MCContext's ELFUniquingMap. MCSectionELF(StringRef Name, unsigned type, unsigned flags, SectionKind K, unsigned entrySize, const MCSymbolELF *group, unsigned UniqueID, MCSymbol *Begin, const MCSymbolELF *LinkedToSym) : MCSection(SV_ELF, Name, K, Begin), Type(type), Flags(flags), UniqueID(UniqueID), EntrySize(entrySize), Group(group), LinkedToSym(LinkedToSym) { if (Group) Group->setIsSignature(); } // TODO Delete after we stop supporting generation of GNU-style .zdebug_* // sections. void setSectionName(StringRef Name) { this->Name = Name; } public: /// Decides whether a '.section' directive should be printed before the /// section name bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 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; StringRef getVirtualSectionKind() const override; bool isUnique() const { return UniqueID != NonUniqueID; } unsigned getUniqueID() const { return UniqueID; } const MCSection *getLinkedToSection() const { return &LinkedToSym->getSection(); } const MCSymbol *getLinkedToSymbol() const { return LinkedToSym; } static bool classof(const MCSection *S) { return S->getVariant() == SV_ELF; } }; } // end namespace llvm #endif // LLVM_MC_MCSECTIONELF_H |