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Create the Seciton -> Rel Section map when it is first needed. NFC.

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Saves a walk over every section.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2015-02-11 23:17:48 +00:00
parent 7f75841a73
commit 3ce0dd9867
1 changed files with 45 additions and 47 deletions
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92
lib/MC/ELFObjectWriter.cpp
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@ -247,11 +247,12 @@ class ELFObjectWriter : public MCObjectWriter {
const RevGroupMapTy &RevGroupMap, const RevGroupMapTy &RevGroupMap,
unsigned NumRegularSections); unsigned NumRegularSections);
void ComputeIndexMap(MCAssembler &Asm, void computeIndexMap(MCAssembler &Asm,
SectionIndexMapTy &SectionIndexMap, SectionIndexMapTy &SectionIndexMap,
const RelMapTy &RelMap); RelMapTy &RelMap);
void CreateRelocationSections(MCAssembler &Asm, RelMapTy &RelMap); MCSectionData *createRelocationSection(MCAssembler &Asm,
const MCSectionData &SD);
void CompressDebugSections(MCAssembler &Asm, MCAsmLayout &Layout); void CompressDebugSections(MCAssembler &Asm, MCAsmLayout &Layout);
@ -263,11 +264,11 @@ class ELFObjectWriter : public MCObjectWriter {
// Create the sections that show up in the symbol table. Currently // Create the sections that show up in the symbol table. Currently
// those are the .note.GNU-stack section and the group sections. // those are the .note.GNU-stack section and the group sections.
void CreateIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout, void createIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout,
GroupMapTy &GroupMap, GroupMapTy &GroupMap,
RevGroupMapTy &RevGroupMap, RevGroupMapTy &RevGroupMap,
SectionIndexMapTy &SectionIndexMap, SectionIndexMapTy &SectionIndexMap,
const RelMapTy &RelMap); RelMapTy &RelMap);
void ExecutePostLayoutBinding(MCAssembler &Asm, void ExecutePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout) override; const MCAsmLayout &Layout) override;
@ -941,9 +942,9 @@ bool ELFObjectWriter::isLocal(const MCSymbolData &Data, bool isUsedInReloc) {
return true; return true;
} }
void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, void ELFObjectWriter::computeIndexMap(MCAssembler &Asm,
SectionIndexMapTy &SectionIndexMap, SectionIndexMapTy &SectionIndexMap,
const RelMapTy &RelMap) { RelMapTy &RelMap) {
unsigned Index = 1; unsigned Index = 1;
for (MCAssembler::iterator it = Asm.begin(), for (MCAssembler::iterator it = Asm.begin(),
ie = Asm.end(); it != ie; ++it) { ie = Asm.end(); it != ie; ++it) {
@ -956,16 +957,20 @@ void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm,
for (MCAssembler::iterator it = Asm.begin(), for (MCAssembler::iterator it = Asm.begin(),
ie = Asm.end(); it != ie; ++it) { ie = Asm.end(); it != ie; ++it) {
const MCSectionData &SD = *it;
const MCSectionELF &Section = const MCSectionELF &Section =
static_cast<const MCSectionELF &>(it->getSection()); static_cast<const MCSectionELF &>(SD.getSection());
if (Section.getType() == ELF::SHT_GROUP || if (Section.getType() == ELF::SHT_GROUP ||
Section.getType() == ELF::SHT_REL || Section.getType() == ELF::SHT_REL ||
Section.getType() == ELF::SHT_RELA) Section.getType() == ELF::SHT_RELA)
continue; continue;
SectionIndexMap[&Section] = Index++; SectionIndexMap[&Section] = Index++;
const MCSectionELF *RelSection = RelMap.lookup(&Section); if (MCSectionData *RelSD = createRelocationSection(Asm, SD)) {
if (RelSection) const MCSectionELF *RelSection =
static_cast<const MCSectionELF *>(&RelSD->getSection());
RelMap[&Section] = RelSection;
SectionIndexMap[RelSection] = Index++; SectionIndexMap[RelSection] = Index++;
}
} }
} }
@ -1115,42 +1120,37 @@ ELFObjectWriter::computeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout,
UndefinedSymbolData[i].SymbolData->setIndex(Index++); UndefinedSymbolData[i].SymbolData->setIndex(Index++);
} }
void ELFObjectWriter::CreateRelocationSections(MCAssembler &Asm, MCSectionData *
RelMapTy &RelMap) { ELFObjectWriter::createRelocationSection(MCAssembler &Asm,
for (MCAssembler::const_iterator it = Asm.begin(), const MCSectionData &SD) {
ie = Asm.end(); it != ie; ++it) { if (Relocations[&SD].empty())
const MCSectionData &SD = *it; return nullptr;
if (Relocations[&SD].empty())
continue;
MCContext &Ctx = Asm.getContext(); MCContext &Ctx = Asm.getContext();
const MCSectionELF &Section = const MCSectionELF &Section =
static_cast<const MCSectionELF&>(SD.getSection()); static_cast<const MCSectionELF &>(SD.getSection());
const StringRef SectionName = Section.getSectionName(); const StringRef SectionName = Section.getSectionName();
std::string RelaSectionName = hasRelocationAddend() ? ".rela" : ".rel"; std::string RelaSectionName = hasRelocationAddend() ? ".rela" : ".rel";
RelaSectionName += SectionName; RelaSectionName += SectionName;
unsigned EntrySize; unsigned EntrySize;
if (hasRelocationAddend()) if (hasRelocationAddend())
EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela); EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela);
else else
EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
unsigned Flags = 0; unsigned Flags = 0;
StringRef Group = ""; StringRef Group = "";
if (Section.getFlags() & ELF::SHF_GROUP) { if (Section.getFlags() & ELF::SHF_GROUP) {
Flags = ELF::SHF_GROUP; Flags = ELF::SHF_GROUP;
Group = Section.getGroup()->getName(); Group = Section.getGroup()->getName();
}
const MCSectionELF *RelaSection =
Ctx.getELFSection(RelaSectionName, hasRelocationAddend() ?
ELF::SHT_RELA : ELF::SHT_REL, Flags,
EntrySize, Group);
RelMap[&Section] = RelaSection;
Asm.getOrCreateSectionData(*RelaSection);
} }
const MCSectionELF *RelaSection = Ctx.getELFSection(
RelaSectionName, hasRelocationAddend() ? ELF::SHT_RELA : ELF::SHT_REL,
Flags, EntrySize, Group);
return &Asm.getOrCreateSectionData(*RelaSection);
} }
static SmallVector<char, 128> static SmallVector<char, 128>
@ -1445,12 +1445,12 @@ void ELFObjectWriter::CreateMetadataSections(
ShStrTabBuilder.data().end()); ShStrTabBuilder.data().end());
} }
void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm, void ELFObjectWriter::createIndexedSections(MCAssembler &Asm,
MCAsmLayout &Layout, MCAsmLayout &Layout,
GroupMapTy &GroupMap, GroupMapTy &GroupMap,
RevGroupMapTy &RevGroupMap, RevGroupMapTy &RevGroupMap,
SectionIndexMapTy &SectionIndexMap, SectionIndexMapTy &SectionIndexMap,
const RelMapTy &RelMap) { RelMapTy &RelMap) {
MCContext &Ctx = Asm.getContext(); MCContext &Ctx = Asm.getContext();
// Build the groups // Build the groups
@ -1474,7 +1474,7 @@ void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm,
GroupMap[Group] = SignatureSymbol; GroupMap[Group] = SignatureSymbol;
} }
ComputeIndexMap(Asm, SectionIndexMap, RelMap); computeIndexMap(Asm, SectionIndexMap, RelMap);
// Add sections to the groups // Add sections to the groups
for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end();
@ -1716,10 +1716,8 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
CompressDebugSections(Asm, const_cast<MCAsmLayout &>(Layout)); CompressDebugSections(Asm, const_cast<MCAsmLayout &>(Layout));
DenseMap<const MCSectionELF*, const MCSectionELF*> RelMap; DenseMap<const MCSectionELF*, const MCSectionELF*> RelMap;
CreateRelocationSections(Asm, RelMap);
const unsigned NumUserAndRelocSections = Asm.size(); const unsigned NumUserAndRelocSections = Asm.size();
CreateIndexedSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap, createIndexedSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
RevGroupMap, SectionIndexMap, RelMap); RevGroupMap, SectionIndexMap, RelMap);
const unsigned AllSections = Asm.size(); const unsigned AllSections = Asm.size();
const unsigned NumIndexedSections = AllSections - NumUserAndRelocSections; const unsigned NumIndexedSections = AllSections - NumUserAndRelocSections;