| //===- MCSectionELF.h - ELF 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 MCSectionELF class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_MC_MCSECTIONELF_H |
| #define LLVM_MC_MCSECTIONELF_H |
| |
| #include "llvm/ADT/Twine.h" |
| #include "llvm/MC/MCSection.h" |
| #include "llvm/MC/MCSymbolELF.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ELF.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| namespace llvm { |
| |
| class MCSymbol; |
| |
| /// MCSectionELF - This represents a section on linux, lots of unix variants |
| /// and some bare metal systems. |
| class MCSectionELF : public MCSection { |
| /// SectionName - This is the name of the section. The referenced memory is |
| /// owned by TargetLoweringObjectFileELF's ELFUniqueMap. |
| StringRef SectionName; |
| |
| /// Type - This is the sh_type field of a section, drawn from the enums below. |
| unsigned Type; |
| |
| /// Flags - This is the sh_flags field of a section, drawn from the enums. |
| /// below. |
| unsigned Flags; |
| |
| unsigned UniqueID; |
| |
| /// EntrySize - 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; |
| |
| /// Depending on the type of the section this is sh_link or sh_info. |
| const MCSectionELF *Associated; |
| |
| private: |
| friend class MCContext; |
| MCSectionELF(StringRef Section, unsigned type, unsigned flags, SectionKind K, |
| unsigned entrySize, const MCSymbolELF *group, unsigned UniqueID, |
| MCSymbol *Begin, const MCSectionELF *Associated) |
| : MCSection(SV_ELF, K, Begin), SectionName(Section), Type(type), |
| Flags(flags), UniqueID(UniqueID), EntrySize(entrySize), Group(group), |
| Associated(Associated) { |
| if (Group) |
| Group->setIsSignature(); |
| } |
| ~MCSectionELF() override; |
| |
| void setSectionName(StringRef Name) { SectionName = Name; } |
| |
| public: |
| |
| /// ShouldOmitSectionDirective - 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; } |
| const MCSymbolELF *getGroup() const { return Group; } |
| |
| void PrintSwitchToSection(const MCAsmInfo &MAI, 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 MCSectionELF *getAssociatedSection() const { return Associated; } |
| |
| static bool classof(const MCSection *S) { |
| return S->getVariant() == SV_ELF; |
| } |
| }; |
| |
| } // end namespace llvm |
| |
| #endif |