1//===- MCSectionMachO.h - MachO Machine Code Sections -----------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file declares the MCSectionMachO class.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_MC_MCSECTIONMACHO_H
14#define LLVM_MC_MCSECTIONMACHO_H
15
16#include "llvm/ADT/StringRef.h"
17#include "llvm/BinaryFormat/MachO.h"
18#include "llvm/MC/MCSection.h"
19
20namespace llvm {
21
22/// This represents a section on a Mach-O system (used by Mac OS X). On a Mac
23/// system, these are also described in /usr/include/mach-o/loader.h.
24class MCSectionMachO final : public MCSection {
25 char SegmentName[16]; // Not necessarily null terminated!
26
27 /// This is the SECTION_TYPE and SECTION_ATTRIBUTES field of a section, drawn
28 /// from the enums below.
29 unsigned TypeAndAttributes;
30
31 /// The 'reserved2' field of a section, used to represent the size of stubs,
32 /// for example.
33 unsigned Reserved2;
34
35 MCSectionMachO(StringRef Segment, StringRef Section, unsigned TAA,
36 unsigned reserved2, SectionKind K, MCSymbol *Begin);
37 friend class MCContext;
38public:
39
40 StringRef getSegmentName() const {
41 // SegmentName is not necessarily null terminated!
42 if (SegmentName[15])
43 return StringRef(SegmentName, 16);
44 return StringRef(SegmentName);
45 }
46
47 unsigned getTypeAndAttributes() const { return TypeAndAttributes; }
48 unsigned getStubSize() const { return Reserved2; }
49
50 MachO::SectionType getType() const {
51 return static_cast<MachO::SectionType>(TypeAndAttributes &
52 MachO::SECTION_TYPE);
53 }
54 bool hasAttribute(unsigned Value) const {
55 return (TypeAndAttributes & Value) != 0;
56 }
57
58 /// Parse the section specifier indicated by "Spec". This is a string that can
59 /// appear after a .section directive in a mach-o flavored .s file. If
60 /// successful, this fills in the specified Out parameters and returns an
61 /// empty string. When an invalid section specifier is present, this returns
62 /// an Error indicating the problem. If no TAA was parsed, TAA is not altered,
63 /// and TAAWasSet becomes false.
64 static Error ParseSectionSpecifier(StringRef Spec, // In.
65 StringRef &Segment, // Out.
66 StringRef &Section, // Out.
67 unsigned &TAA, // Out.
68 bool &TAAParsed, // Out.
69 unsigned &StubSize); // Out.
70
71 void printSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
72 raw_ostream &OS,
73 const MCExpr *Subsection) const override;
74 bool useCodeAlign() const override;
75 bool isVirtualSection() const override;
76
77 static bool classof(const MCSection *S) {
78 return S->getVariant() == SV_MachO;
79 }
80};
81
82} // end namespace llvm
83
84#endif
85

source code of llvm/include/llvm/MC/MCSectionMachO.h