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