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c85dca66e6
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124054 91177308-0d34-0410-b5e6-96231b3b80d8
139 lines
4.5 KiB
C++
139 lines
4.5 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/MC/MCSection.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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/// 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,
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SectionKind K, unsigned entrySize, const MCSymbol *group)
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: MCSection(SV_ELF, K), SectionName(Section), Type(type), Flags(flags),
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EntrySize(entrySize), Group(group) {}
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~MCSectionELF();
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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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/// HasCommonSymbols - True if this section holds common symbols, this is
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/// indicated on the ELF object file by a symbol with SHN_COMMON section
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/// header index.
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bool HasCommonSymbols() const;
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/// Valid section flags.
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enum {
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// The section contains data that should be writable.
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SHF_WRITE = 0x1U,
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// The section occupies memory during execution.
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SHF_ALLOC = 0x2U,
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// The section contains executable machine instructions.
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SHF_EXECINSTR = 0x4U,
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// The data in the section may be merged to eliminate duplication.
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SHF_MERGE = 0x10U,
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// Elements in the section consist of null-terminated character strings.
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SHF_STRINGS = 0x20U,
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// A field in this section holds a section header table index.
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SHF_INFO_LINK = 0x40U,
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// Adds special ordering requirements for link editors.
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SHF_LINK_ORDER = 0x80U,
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// This section requires special OS-specific processing to avoid incorrect
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// behavior.
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SHF_OS_NONCONFORMING = 0x100U,
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// This section is a member of a section group.
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SHF_GROUP = 0x200U,
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// This section holds Thread-Local Storage.
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SHF_TLS = 0x400U,
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// Start of target-specific flags.
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/// XCORE_SHF_CP_SECTION - All sections with the "c" flag are grouped
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/// together by the linker to form the constant pool and the cp register is
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/// set to the start of the constant pool by the boot code.
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XCORE_SHF_CP_SECTION = 0x800U,
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/// XCORE_SHF_DP_SECTION - All sections with the "d" flag are grouped
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/// together by the linker to form the data section and the dp register is
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/// set to the start of the section by the boot code.
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XCORE_SHF_DP_SECTION = 0x1000U
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};
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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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const MCSymbol *getGroup() const { return Group; }
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void PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS) const;
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virtual bool UseCodeAlign() const;
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virtual bool isVirtualSection() const;
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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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virtual bool isBaseAddressKnownZero() const {
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return (getFlags() & 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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static bool classof(const MCSectionELF *) { return true; }
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// Return the entry size for sections with fixed-width data.
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static unsigned DetermineEntrySize(SectionKind Kind);
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};
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} // end namespace llvm
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#endif
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