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e0a2541eb7
Add support for having multiple sections with the same name and comdat. Using this in combination with -ffunction-sections allows LLVM to output a .o file with mulitple sections named .text. This saves space by avoiding long unique names of the form .text.<C++ mangled name>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229541 91177308-0d34-0410-b5e6-96231b3b80d8
102 lines
3.3 KiB
C++
102 lines
3.3 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/MCSymbol.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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/// MCSectionELF - This represents a section on linux, lots of unix variants
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/// and some bare metal systems.
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class MCSectionELF : public MCSection {
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/// SectionName - This is the name of the section. The referenced memory is
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/// owned by TargetLoweringObjectFileELF's ELFUniqueMap.
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StringRef SectionName;
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/// Type - This is the sh_type field of a section, drawn from the enums below.
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unsigned Type;
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/// Flags - This is the sh_flags field of a section, drawn from the enums.
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/// below.
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unsigned Flags;
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bool Unique;
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/// EntrySize - The size of each entry in this section. This size only
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/// makes sense for sections that contain fixed-sized entries. If a
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/// section does not contain fixed-sized entries 'EntrySize' will be 0.
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unsigned EntrySize;
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const MCSymbol *Group;
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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 MCSymbol *group, bool Unique)
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: MCSection(SV_ELF, K), SectionName(Section), Type(type), Flags(flags),
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Unique(Unique), EntrySize(entrySize), Group(group) {}
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~MCSectionELF();
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void setSectionName(StringRef Name) { SectionName = Name; }
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public:
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/// ShouldOmitSectionDirective - Decides whether a '.section' directive
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/// should be printed before the 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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std::string getLabelBeginName() const override {
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if (Group)
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return (SectionName.str() + '_' + Group->getName() + "_begin").str();
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return SectionName.str() + "_begin";
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}
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std::string getLabelEndName() const override {
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if (Group)
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return (SectionName.str() + '_' + Group->getName() + "_end").str();
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return SectionName.str() + "_end";
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}
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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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const MCSymbol *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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/// isBaseAddressKnownZero - We know that non-allocatable sections (like
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/// debug info) have a base of zero.
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bool isBaseAddressKnownZero() const override {
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return (getFlags() & ELF::SHF_ALLOC) == 0;
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}
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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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