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134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
//===- lib/MC/MCSectionELF.cpp - ELF Code Section Representation ----------===//
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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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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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MCSectionELF::~MCSectionELF() {} // anchor.
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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 MCSectionELF::ShouldOmitSectionDirective(StringRef Name,
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const MCAsmInfo &MAI) const {
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// FIXME: Does .section .bss/.data/.text work everywhere??
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if (Name == ".text" || Name == ".data" ||
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(Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS()))
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return true;
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return false;
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}
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void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS) const {
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if (ShouldOmitSectionDirective(SectionName, MAI)) {
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OS << '\t' << getSectionName() << '\n';
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return;
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}
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OS << "\t.section\t" << getSectionName();
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// Handle the weird solaris syntax if desired.
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if (MAI.usesSunStyleELFSectionSwitchSyntax() &&
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!(Flags & MCSectionELF::SHF_MERGE)) {
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if (Flags & MCSectionELF::SHF_ALLOC)
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OS << ",#alloc";
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if (Flags & MCSectionELF::SHF_EXECINSTR)
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OS << ",#execinstr";
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if (Flags & MCSectionELF::SHF_WRITE)
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OS << ",#write";
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if (Flags & MCSectionELF::SHF_TLS)
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OS << ",#tls";
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OS << '\n';
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return;
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}
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OS << ",\"";
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if (Flags & MCSectionELF::SHF_ALLOC)
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OS << 'a';
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if (Flags & MCSectionELF::SHF_EXECINSTR)
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OS << 'x';
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if (Flags & MCSectionELF::SHF_WRITE)
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OS << 'w';
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if (Flags & MCSectionELF::SHF_MERGE)
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OS << 'M';
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if (Flags & MCSectionELF::SHF_STRINGS)
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OS << 'S';
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if (Flags & MCSectionELF::SHF_TLS)
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OS << 'T';
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// If there are target-specific flags, print them.
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if (Flags & MCSectionELF::XCORE_SHF_CP_SECTION)
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OS << 'c';
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if (Flags & MCSectionELF::XCORE_SHF_DP_SECTION)
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OS << 'd';
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OS << '"';
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OS << ',';
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// If comment string is '@', e.g. as on ARM - use '%' instead
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if (MAI.getCommentString()[0] == '@')
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OS << '%';
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else
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OS << '@';
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if (Type == MCSectionELF::SHT_INIT_ARRAY)
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OS << "init_array";
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else if (Type == MCSectionELF::SHT_FINI_ARRAY)
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OS << "fini_array";
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else if (Type == MCSectionELF::SHT_PREINIT_ARRAY)
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OS << "preinit_array";
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else if (Type == MCSectionELF::SHT_NOBITS)
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OS << "nobits";
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else if (Type == MCSectionELF::SHT_PROGBITS)
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OS << "progbits";
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if (EntrySize) {
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assert(Flags & MCSectionELF::SHF_MERGE);
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OS << "," << EntrySize;
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}
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OS << '\n';
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}
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bool MCSectionELF::UseCodeAlign() const {
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return getFlags() & MCSectionELF::SHF_EXECINSTR;
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}
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bool MCSectionELF::isVirtualSection() const {
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return getType() == MCSectionELF::SHT_NOBITS;
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}
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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 MCSectionELF::HasCommonSymbols() const {
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if (StringRef(SectionName).startswith(".gnu.linkonce."))
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return true;
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return false;
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}
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unsigned MCSectionELF::DetermineEntrySize(SectionKind Kind) {
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if (Kind.isMergeable1ByteCString()) return 1;
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if (Kind.isMergeable2ByteCString()) return 2;
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if (Kind.isMergeable4ByteCString()) return 4;
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if (Kind.isMergeableConst4()) return 4;
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if (Kind.isMergeableConst8()) return 8;
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if (Kind.isMergeableConst16()) return 16;
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return 0;
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}
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