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 /// MCSectionMachO - This represents a section on a Mach-O system (used by
24 /// Mac OS X). On a Mac system, these are also described in
25 /// /usr/include/mach-o/loader.h.
26 class MCSectionMachO : public MCSection {
27 char SegmentName[16]; // Not necessarily null terminated!
28 char SectionName[16]; // Not necessarily null terminated!
30 /// TypeAndAttributes - This is the SECTION_TYPE and SECTION_ATTRIBUTES
31 /// field of a section, drawn from the enums below.
32 unsigned TypeAndAttributes;
34 /// Reserved2 - The 'reserved2' field of a section, used to represent the
35 /// size of stubs, for example.
38 MCSectionMachO(StringRef Segment, StringRef Section,
39 unsigned TAA, unsigned reserved2, SectionKind K);
40 friend class MCContext;
43 StringRef getSegmentName() const {
44 // SegmentName is not necessarily null terminated!
46 return StringRef(SegmentName, 16);
47 return StringRef(SegmentName);
49 StringRef getSectionName() const {
50 // SectionName is not necessarily null terminated!
52 return StringRef(SectionName, 16);
53 return StringRef(SectionName);
56 std::string getLabelBeginName() const override {
57 return StringRef(getSegmentName().str() + getSectionName().str() + "_begin");
60 std::string getLabelEndName() const override {
61 return StringRef(getSegmentName().str() + getSectionName().str() + "_end");
64 unsigned getTypeAndAttributes() const { return TypeAndAttributes; }
65 unsigned getStubSize() const { return Reserved2; }
67 MachO::SectionType getType() const {
68 return static_cast<MachO::SectionType>(TypeAndAttributes &
71 bool hasAttribute(unsigned Value) const {
72 return (TypeAndAttributes & Value) != 0;
75 /// ParseSectionSpecifier - Parse the section specifier indicated by "Spec".
76 /// This is a string that can appear after a .section directive in a mach-o
77 /// flavored .s file. If successful, this fills in the specified Out
78 /// parameters and returns an empty string. When an invalid section
79 /// specifier is present, this returns a string indicating the problem.
80 /// If no TAA was parsed, TAA is not altered, and TAAWasSet becomes false.
81 static std::string ParseSectionSpecifier(StringRef Spec, // In.
82 StringRef &Segment, // Out.
83 StringRef &Section, // Out.
84 unsigned &TAA, // Out.
85 bool &TAAParsed, // Out.
86 unsigned &StubSize); // Out.
88 void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS,
89 const MCExpr *Subsection) const override;
90 bool UseCodeAlign() const override;
91 bool isVirtualSection() const override;
93 static bool classof(const MCSection *S) {
94 return S->getVariant() == SV_MachO;
98 } // end namespace llvm