1 //===- MCSectionELF.h - ELF Machine Code Sections ---------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the MCSectionELF class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_MC_MCSECTIONELF_H
15 #define LLVM_MC_MCSECTIONELF_H
17 #include "llvm/MC/MCSection.h"
18 #include "llvm/Support/ELF.h"
19 #include "llvm/ADT/StringRef.h"
25 /// MCSectionELF - This represents a section on linux, lots of unix variants
26 /// and some bare metal systems.
27 class MCSectionELF : public MCSection {
28 /// SectionName - This is the name of the section. The referenced memory is
29 /// owned by TargetLoweringObjectFileELF's ELFUniqueMap.
30 StringRef SectionName;
32 /// Type - This is the sh_type field of a section, drawn from the enums below.
35 /// Flags - This is the sh_flags field of a section, drawn from the enums.
39 /// EntrySize - The size of each entry in this section. This size only
40 /// makes sense for sections that contain fixed-sized entries. If a
41 /// section does not contain fixed-sized entries 'EntrySize' will be 0.
44 const MCSymbol *Group;
47 friend class MCContext;
48 MCSectionELF(StringRef Section, unsigned type, unsigned flags,
49 SectionKind K, unsigned entrySize, const MCSymbol *group)
50 : MCSection(SV_ELF, K), SectionName(Section), Type(type), Flags(flags),
51 EntrySize(entrySize), Group(group) {}
55 /// ShouldOmitSectionDirective - Decides whether a '.section' directive
56 /// should be printed before the section name
57 bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
59 StringRef getSectionName() const { return SectionName; }
60 unsigned getType() const { return Type; }
61 unsigned getFlags() const { return Flags; }
62 unsigned getEntrySize() const { return EntrySize; }
63 const MCSymbol *getGroup() const { return Group; }
65 void PrintSwitchToSection(const MCAsmInfo &MAI,
66 raw_ostream &OS) const;
67 virtual bool UseCodeAlign() const;
68 virtual bool isVirtualSection() const;
70 /// isBaseAddressKnownZero - We know that non-allocatable sections (like
71 /// debug info) have a base of zero.
72 virtual bool isBaseAddressKnownZero() const {
73 return (getFlags() & ELF::SHF_ALLOC) == 0;
76 static bool classof(const MCSection *S) {
77 return S->getVariant() == SV_ELF;
79 static bool classof(const MCSectionELF *) { return true; }
81 // Return the entry size for sections with fixed-width data.
82 static unsigned DetermineEntrySize(SectionKind Kind);
86 } // end namespace llvm