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