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 | |
20 | namespace 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. |
24 | class 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; |
38 | public: |
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 | |