Line data    Source code

       1             : //===- MCSectionELF.h - ELF Machine Code Sections ---------------*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file declares the MCSectionELF class.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #ifndef LLVM_MC_MCSECTIONELF_H
      15             : #define LLVM_MC_MCSECTIONELF_H
      16             : 
      17             : #include "llvm/ADT/StringRef.h"
      18             : #include "llvm/MC/MCSection.h"
      19             : #include "llvm/MC/MCSymbolELF.h"
      20             : #include "llvm/MC/SectionKind.h"
      21             : 
      22             : namespace llvm {
      23             : 
      24             : class MCSymbol;
      25             : 
      26             : /// This represents a section on linux, lots of unix variants and some bare
      27             : /// metal systems.
      28     2728867 : class MCSectionELF final : public MCSection {
      29             :   /// This is the name of the section.  The referenced memory is owned by
      30             :   /// TargetLoweringObjectFileELF's ELFUniqueMap.
      31             :   StringRef SectionName;
      32             : 
      33             :   /// This is the sh_type field of a section, drawn from the enums below.
      34             :   unsigned Type;
      35             : 
      36             :   /// This is the sh_flags field of a section, drawn from the enums below.
      37             :   unsigned Flags;
      38             : 
      39             :   unsigned UniqueID;
      40             : 
      41             :   /// The size of each entry in this section. This size only makes sense for
      42             :   /// sections that contain fixed-sized entries. If a section does not contain
      43             :   /// fixed-sized entries 'EntrySize' will be 0.
      44             :   unsigned EntrySize;
      45             : 
      46             :   const MCSymbolELF *Group;
      47             : 
      48             :   /// sh_info for SHF_LINK_ORDER (can be null).
      49             :   const MCSymbol *AssociatedSymbol;
      50             : 
      51             : private:
      52             :   friend class MCContext;
      53             : 
      54             :   MCSectionELF(StringRef Section, unsigned type, unsigned flags, SectionKind K,
      55             :                unsigned entrySize, const MCSymbolELF *group, unsigned UniqueID,
      56             :                MCSymbol *Begin, const MCSymbolELF *AssociatedSymbol)
      57     2736487 :       : MCSection(SV_ELF, K, Begin), SectionName(Section), Type(type),
      58             :         Flags(flags), UniqueID(UniqueID), EntrySize(entrySize), Group(group),
      59     2736487 :         AssociatedSymbol(AssociatedSymbol) {
      60     2736489 :     if (Group)
      61      587773 :       Group->setIsSignature();
      62             :   }
      63             : 
      64           7 :   void setSectionName(StringRef Name) { SectionName = Name; }
      65             : 
      66             : public:
      67             :   ~MCSectionELF();
      68             : 
      69             :   /// Decides whether a '.section' directive should be printed before the
      70             :   /// section name
      71             :   bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
      72             : 
      73           0 :   StringRef getSectionName() const { return SectionName; }
      74           0 :   unsigned getType() const { return Type; }
      75           0 :   unsigned getFlags() const { return Flags; }
      76           0 :   unsigned getEntrySize() const { return EntrySize; }
      77           6 :   void setFlags(unsigned F) { Flags = F; }
      78           0 :   const MCSymbolELF *getGroup() const { return Group; }
      79             : 
      80             :   void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
      81             :                             raw_ostream &OS,
      82             :                             const MCExpr *Subsection) const override;
      83             :   bool UseCodeAlign() const override;
      84             :   bool isVirtualSection() const override;
      85             : 
      86           0 :   bool isUnique() const { return UniqueID != ~0U; }
      87           0 :   unsigned getUniqueID() const { return UniqueID; }
      88             : 
      89           0 :   const MCSection *getAssociatedSection() const { return &AssociatedSymbol->getSection(); }
      90           0 :   const MCSymbol *getAssociatedSymbol() const { return AssociatedSymbol; }
      91             : 
      92             :   static bool classof(const MCSection *S) {
      93           1 :     return S->getVariant() == SV_ELF;
      94             :   }
      95             : };
      96             : 
      97             : } // end namespace llvm
      98             : 
      99             : #endif // LLVM_MC_MCSECTIONELF_H