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f1afe1c451
Fix: updated clang code which was not updated by mistake. Original commit message: [llvm-mc] - Teach llvm-mc to generate zlib styled compression sections. This patch is strongly based on previously reverted D20331. (because of gnuutils < 2.26 does not support compressed debug sections in non zlib-gnu style) Difference that this patch supports both zlib and zlib-gnu styles. -compress-debug-sections option now supports next values: -compress-debug-sections=zlib-gnu -compress-debug-sections=zlib -compress-debug-sections=none Previously specifying -compress-debug-sections enabled zlib-gnu compression, so anyone can put "-compress-debug-sections=zlib-gnu" to restore the behavior that was before this patch for case when compression was enabled. Differential revision: http://reviews.llvm.org/D20676 llvm-svn: 270987
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
//===- MCSectionELF.h - ELF Machine Code Sections ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the MCSectionELF class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSECTIONELF_H
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#define LLVM_MC_MCSECTIONELF_H
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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class MCSymbol;
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/// This represents a section on linux, lots of unix variants and some bare
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/// metal systems.
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class MCSectionELF final : public MCSection {
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/// This is the name of the section. The referenced memory is owned by
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/// TargetLoweringObjectFileELF's ELFUniqueMap.
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StringRef SectionName;
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/// This is the sh_type field of a section, drawn from the enums below.
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unsigned Type;
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/// This is the sh_flags field of a section, drawn from the enums below.
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unsigned Flags;
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unsigned UniqueID;
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/// The size of each entry in this section. This size only makes sense for
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/// sections that contain fixed-sized entries. If a section does not contain
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/// fixed-sized entries 'EntrySize' will be 0.
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unsigned EntrySize;
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const MCSymbolELF *Group;
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/// Depending on the type of the section this is sh_link or sh_info.
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const MCSectionELF *Associated;
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private:
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friend class MCContext;
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MCSectionELF(StringRef Section, unsigned type, unsigned flags, SectionKind K,
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unsigned entrySize, const MCSymbolELF *group, unsigned UniqueID,
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MCSymbol *Begin, const MCSectionELF *Associated)
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: MCSection(SV_ELF, K, Begin), SectionName(Section), Type(type),
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Flags(flags), UniqueID(UniqueID), EntrySize(entrySize), Group(group),
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Associated(Associated) {
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if (Group)
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Group->setIsSignature();
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}
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void setSectionName(StringRef Name) { SectionName = Name; }
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public:
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~MCSectionELF();
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/// Decides whether a '.section' directive should be printed before the
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/// section name
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bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
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StringRef getSectionName() const { return SectionName; }
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unsigned getType() const { return Type; }
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unsigned getFlags() const { return Flags; }
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unsigned getEntrySize() const { return EntrySize; }
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void setFlags(unsigned F) { Flags = F; }
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const MCSymbolELF *getGroup() const { return Group; }
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void PrintSwitchToSection(const MCAsmInfo &MAI, 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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bool isUnique() const { return UniqueID != ~0U; }
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unsigned getUniqueID() const { return UniqueID; }
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const MCSectionELF *getAssociatedSection() const { return Associated; }
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static bool classof(const MCSection *S) {
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return S->getVariant() == SV_ELF;
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}
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};
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} // end namespace llvm
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#endif
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