1 //===- MCSectionMachO.h - MachO 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 MCSectionMachO class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_MC_MCSECTIONMACHO_H
15 #define LLVM_MC_MCSECTIONMACHO_H
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/MC/MCSection.h"
19 #include "llvm/Support/MachO.h"
23 /// This represents a section on a Mach-O system (used by Mac OS X). On a Mac
24 /// system, these are also described in /usr/include/mach-o/loader.h.
25 class MCSectionMachO final : public MCSection {
26 char SegmentName[16]; // Not necessarily null terminated!
27 char SectionName[16]; // Not necessarily null terminated!
29 /// This is the SECTION_TYPE and SECTION_ATTRIBUTES field of a section, drawn
30 /// from the enums below.
31 unsigned TypeAndAttributes;
33 /// The 'reserved2' field of a section, used to represent the size of stubs,
37 MCSectionMachO(StringRef Segment, StringRef Section, unsigned TAA,
38 unsigned reserved2, SectionKind K, MCSymbol *Begin);
39 friend class MCContext;
42 StringRef getSegmentName() const {
43 // SegmentName is not necessarily null terminated!
45 return StringRef(SegmentName, 16);
46 return StringRef(SegmentName);
48 StringRef getSectionName() const {
49 // SectionName is not necessarily null terminated!
51 return StringRef(SectionName, 16);
52 return StringRef(SectionName);
55 unsigned getTypeAndAttributes() const { return TypeAndAttributes; }
56 unsigned getStubSize() const { return Reserved2; }
58 MachO::SectionType getType() const {
59 return static_cast<MachO::SectionType>(TypeAndAttributes &
62 bool hasAttribute(unsigned Value) const {
63 return (TypeAndAttributes & Value) != 0;
66 /// Parse the section specifier indicated by "Spec". This is a string that can
67 /// appear after a .section directive in a mach-o flavored .s file. If
68 /// successful, this fills in the specified Out parameters and returns an
69 /// empty string. When an invalid section specifier is present, this returns
70 /// a string indicating the problem. If no TAA was parsed, TAA is not altered,
71 /// and TAAWasSet becomes false.
72 static std::string ParseSectionSpecifier(StringRef Spec, // In.
73 StringRef &Segment, // Out.
74 StringRef &Section, // Out.
75 unsigned &TAA, // Out.
76 bool &TAAParsed, // Out.
77 unsigned &StubSize); // Out.
79 void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS,
80 const MCExpr *Subsection) const override;
81 bool UseCodeAlign() const override;
82 bool isVirtualSection() const override;
84 static bool classof(const MCSection *S) {
85 return S->getVariant() == SV_MachO;
89 } // end namespace llvm