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Special case the creation of relocation sections.

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These sections are never looked up and we know when have to create them. Use
that to save adding them to the regular map and avoid a symbol->string->symbol
conversion for the group symbol.

This also makes the implementation independent of the details of how unique
sections are implemented.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233539 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2015-03-30 13:39:16 +00:00
parent 35efeb5e16
commit 0bd11cd898
3 changed files with 20 additions and 6 deletions
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5
include/llvm/MC/MCContext.h
View File

@ -194,6 +194,7 @@ namespace llvm {
StringMap<const MCSectionMachO*> MachOUniquingMap;
std::map<ELFSectionKey, const MCSectionELF *> ELFUniquingMap;
std::map<COFFSectionKey, const MCSectionCOFF *> COFFUniquingMap;
StringMap<bool> ELFRelSecNames;
/// Do automatic reset in destructor
bool AutoReset;
@ -304,6 +305,10 @@ namespace llvm {
StringRef Group, bool Unique,
const char *BeginSymName = nullptr);
const MCSectionELF *createELFRelSection(StringRef Name, unsigned Type,
unsigned Flags, unsigned EntrySize,
const MCSymbol *Group);
void renameELFSection(const MCSectionELF *Section, StringRef Name);
const MCSectionELF *CreateELFGroupSection();

9
lib/MC/ELFObjectWriter.cpp
View File

@ -1167,15 +1167,12 @@ ELFObjectWriter::createRelocationSection(MCAssembler &Asm,
EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
unsigned Flags = 0;
StringRef Group = "";
if (Section.getFlags() & ELF::SHF_GROUP) {
if (Section.getFlags() & ELF::SHF_GROUP)
Flags = ELF::SHF_GROUP;
Group = Section.getGroup()->getName();
}
const MCSectionELF *RelaSection = Ctx.getELFSection(
const MCSectionELF *RelaSection = Ctx.createELFRelSection(
RelaSectionName, hasRelocationAddend() ? ELF::SHT_RELA : ELF::SHT_REL,
Flags, EntrySize, Group, true);
Flags, EntrySize, Section.getGroup());
return &Asm.getOrCreateSectionData(*RelaSection);
}

12
lib/MC/MCContext.cpp
View File

@ -275,6 +275,18 @@ void MCContext::renameELFSection(const MCSectionELF *Section, StringRef Name) {
const_cast<MCSectionELF*>(Section)->setSectionName(CachedName);
}
const MCSectionELF *
MCContext::createELFRelSection(StringRef Name, unsigned Type, unsigned Flags,
unsigned EntrySize, const MCSymbol *Group) {
StringMap<bool>::iterator I;
bool Inserted;
std::tie(I, Inserted) = ELFRelSecNames.insert(std::make_pair(Name, true));
return new (*this)
MCSectionELF(I->getKey(), Type, Flags, SectionKind::getReadOnly(),
EntrySize, Group, true, nullptr);
}
const MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
unsigned Flags, unsigned EntrySize,
StringRef Group, bool Unique,