| //===- MCSectionMachO.h - MachO Machine Code Sections -----------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file declares the MCSectionMachO class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_MC_MCSECTIONMACHO_H |
| #define LLVM_MC_MCSECTIONMACHO_H |
| |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/MC/MCSection.h" |
| #include "llvm/Support/MachO.h" |
| |
| namespace llvm { |
| |
| /// MCSectionMachO - 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 : public MCSection { |
| char SegmentName[16]; // Not necessarily null terminated! |
| char SectionName[16]; // Not necessarily null terminated! |
| |
| /// TypeAndAttributes - This is the SECTION_TYPE and SECTION_ATTRIBUTES |
| /// field of a section, drawn from the enums below. |
| unsigned TypeAndAttributes; |
| |
| /// Reserved2 - 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); |
| 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); |
| } |
| |
| std::string getLabelBeginName() const override { |
| return StringRef(getSegmentName().str() + getSectionName().str() + "_begin"); |
| } |
| |
| std::string getLabelEndName() const override { |
| return StringRef(getSegmentName().str() + getSectionName().str() + "_end"); |
| } |
| |
| 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; |
| } |
| |
| /// ParseSectionSpecifier - 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, 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 |