| //===- MCSectionMachO.h - MachO Machine Code Sections -----------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file declares the MCSectionMachO class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_MC_MCSECTIONMACHO_H |
| #define LLVM_MC_MCSECTIONMACHO_H |
| |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/BinaryFormat/MachO.h" |
| #include "llvm/MC/MCSection.h" |
| |
| namespace llvm { |
| |
| /// This represents a section on a Mach-O system (used by Mac OS X). On a Mac |
| /// system, these are also described in /usr/include/mach-o/loader.h. |
| class MCSectionMachO final : public MCSection { |
| char SegmentName[16]; // Not necessarily null terminated! |
| char SectionName[16]; // Not necessarily null terminated! |
| |
| /// This is the SECTION_TYPE and SECTION_ATTRIBUTES field of a section, drawn |
| /// from the enums below. |
| unsigned TypeAndAttributes; |
| |
| /// The 'reserved2' field of a section, used to represent the size of stubs, |
| /// for example. |
| unsigned Reserved2; |
| |
| MCSectionMachO(StringRef Segment, StringRef Section, unsigned TAA, |
| unsigned reserved2, SectionKind K, MCSymbol *Begin); |
| friend class MCContext; |
| public: |
| |
| StringRef getSegmentName() const { |
| // SegmentName is not necessarily null terminated! |
| if (SegmentName[15]) |
| return StringRef(SegmentName, 16); |
| return StringRef(SegmentName); |
| } |
| StringRef getSectionName() const { |
| // SectionName is not necessarily null terminated! |
| if (SectionName[15]) |
| return StringRef(SectionName, 16); |
| return StringRef(SectionName); |
| } |
| |
| unsigned getTypeAndAttributes() const { return TypeAndAttributes; } |
| unsigned getStubSize() const { return Reserved2; } |
| |
| MachO::SectionType getType() const { |
| return static_cast<MachO::SectionType>(TypeAndAttributes & |
| MachO::SECTION_TYPE); |
| } |
| bool hasAttribute(unsigned Value) const { |
| return (TypeAndAttributes & Value) != 0; |
| } |
| |
| /// Parse the section specifier indicated by "Spec". This is a string that can |
| /// appear after a .section directive in a mach-o flavored .s file. If |
| /// successful, this fills in the specified Out parameters and returns an |
| /// empty string. When an invalid section specifier is present, this returns |
| /// a string indicating the problem. If no TAA was parsed, TAA is not altered, |
| /// and TAAWasSet becomes false. |
| static std::string ParseSectionSpecifier(StringRef Spec, // In. |
| StringRef &Segment, // Out. |
| StringRef &Section, // Out. |
| unsigned &TAA, // Out. |
| bool &TAAParsed, // Out. |
| unsigned &StubSize); // Out. |
| |
| void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T, |
| raw_ostream &OS, |
| const MCExpr *Subsection) const override; |
| bool UseCodeAlign() const override; |
| bool isVirtualSection() const override; |
| |
| static bool classof(const MCSection *S) { |
| return S->getVariant() == SV_MachO; |
| } |
| }; |
| |
| } // end namespace llvm |
| |
| #endif |