class ELFObjectWriter : public MCObjectWriter {
static bool isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind);
static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant);
- static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout);
- static bool isInSymtab(const MCAsmLayout &Layout, const MCSymbolData &Data,
+ static uint64_t SymbolValue(const MCSymbol &Sym, const MCAsmLayout &Layout);
+ static bool isInSymtab(const MCAsmLayout &Layout, const MCSymbol &Symbol,
bool Used, bool Renamed);
- static bool isLocal(const MCSymbolData &Data, bool isUsedInReloc);
+ static bool isLocal(const MCSymbol &Symbol, bool isUsedInReloc);
/// Helper struct for containing some precomputed information on symbols.
struct ELFSymbolData {
- MCSymbolData *SymbolData;
+ const MCSymbol *Symbol;
uint64_t StringIndex;
uint32_t SectionIndex;
StringRef Name;
// Support lexicographic sorting.
bool operator<(const ELFSymbolData &RHS) const {
- unsigned LHSType = MCELF::GetType(*SymbolData);
- unsigned RHSType = MCELF::GetType(*RHS.SymbolData);
+ unsigned LHSType = MCELF::GetType(Symbol->getData());
+ unsigned RHSType = MCELF::GetType(RHS.Symbol->getData());
if (LHSType == ELF::STT_SECTION && RHSType != ELF::STT_SECTION)
return false;
if (LHSType != ELF::STT_SECTION && RHSType == ELF::STT_SECTION)
unsigned ShstrtabIndex;
// Sections in the order they are to be output in the section table.
- std::vector<const MCSectionELF *> SectionTable;
- unsigned addToSectionTable(const MCSectionELF *Sec);
+ std::vector<MCSectionELF *> SectionTable;
+ unsigned addToSectionTable(MCSectionELF *Sec);
// TargetObjectWriter wrappers.
bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
bool shouldRelocateWithSymbol(const MCAssembler &Asm,
const MCSymbolRefExpr *RefA,
- const MCSymbolData *SD, uint64_t C,
+ const MCSymbol *Sym, uint64_t C,
unsigned Type) const;
void RecordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
const SectionIndexMapTy &SectionIndexMap,
const RevGroupMapTy &RevGroupMap);
- const MCSectionELF *createRelocationSection(MCAssembler &Asm,
- const MCSectionELF &Sec);
+ MCSectionELF *createRelocationSection(MCAssembler &Asm,
+ const MCSectionELF &Sec);
const MCSectionELF *createSectionHeaderStringTable();
const MCSectionELF *createStringTable(MCContext &Ctx);
bool InSet,
bool IsPCRel) const override;
- bool isWeak(const MCSymbolData &SD) const override;
+ bool isWeak(const MCSymbol &Sym) const override;
void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
void writeSection(MCAssembler &Asm,
const SectionIndexMapTy &SectionIndexMap,
- uint32_t GroupSymbolIndex,
- uint64_t Offset, uint64_t Size, uint64_t Alignment,
+ uint32_t GroupSymbolIndex, uint64_t Offset, uint64_t Size,
const MCSectionELF &Section);
};
}
-unsigned ELFObjectWriter::addToSectionTable(const MCSectionELF *Sec) {
+unsigned ELFObjectWriter::addToSectionTable(MCSectionELF *Sec) {
SectionTable.push_back(Sec);
ShStrTabBuilder.add(Sec->getSectionName());
return SectionTable.size();
Write16(ShstrtabIndex);
}
-uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &Data,
+uint64_t ELFObjectWriter::SymbolValue(const MCSymbol &Sym,
const MCAsmLayout &Layout) {
+ MCSymbolData &Data = Sym.getData();
if (Data.isCommon() && Data.isExternal())
return Data.getCommonAlignment();
uint64_t Res;
- if (!Layout.getSymbolOffset(&Data, Res))
+ if (!Layout.getSymbolOffset(Sym, Res))
return 0;
- if (Layout.getAssembler().isThumbFunc(&Data.getSymbol()))
+ if (Layout.getAssembler().isThumbFunc(&Sym))
Res |= 1;
return Res;
void ELFObjectWriter::WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD,
const MCAsmLayout &Layout) {
- MCSymbolData &OrigData = *MSD.SymbolData;
+ MCSymbolData &OrigData = MSD.Symbol->getData();
assert((!OrigData.getFragment() ||
(&OrigData.getFragment()->getParent()->getSection() ==
- &OrigData.getSymbol().getSection())) &&
+ &MSD.Symbol->getSection())) &&
"The symbol's section doesn't match the fragment's symbol");
- const MCSymbol *Base = Layout.getBaseSymbol(OrigData.getSymbol());
+ const MCSymbol *Base = Layout.getBaseSymbol(*MSD.Symbol);
// This has to be in sync with when computeSymbolTable uses SHN_ABS or
// SHN_COMMON.
uint8_t Other = MCELF::getOther(OrigData) << (ELF_STO_Shift - ELF_STV_Shift);
Other |= Visibility;
- uint64_t Value = SymbolValue(OrigData, Layout);
+ uint64_t Value = SymbolValue(*MSD.Symbol, Layout);
uint64_t Size = 0;
const MCExpr *ESize = OrigData.getSize();
unsigned EntrySize = is64Bit() ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32;
// Symbol table
- const MCSectionELF *SymtabSection =
+ MCSectionELF *SymtabSection =
Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, EntrySize, "");
MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection);
SymtabSD.setAlignment(is64Bit() ? 8 : 4);
for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) {
ELFSymbolData &MSD = ExternalSymbolData[i];
- MCSymbolData &Data = *MSD.SymbolData;
+ MCSymbolData &Data = MSD.Symbol->getData();
assert(((Data.getFlags() & ELF_STB_Global) ||
(Data.getFlags() & ELF_STB_Weak)) &&
"External symbol requires STB_GLOBAL or STB_WEAK flag");
for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) {
ELFSymbolData &MSD = UndefinedSymbolData[i];
- MCSymbolData &Data = *MSD.SymbolData;
+ MCSymbolData &Data = MSD.Symbol->getData();
WriteSymbol(Writer, MSD, Layout);
if (MCELF::GetBinding(Data) == ELF::STB_LOCAL)
LastLocalSymbolIndex++;
return;
SecStart = OS.tell();
- const MCSectionELF *SymtabShndxSection =
+ MCSectionELF *SymtabShndxSection =
Ctx.getELFSection(".symtab_shndxr", ELF::SHT_SYMTAB_SHNDX, 0, 4, "");
addToSectionTable(SymtabShndxSection);
MCSectionData *SymtabShndxSD =
// allows us to omit some local symbols from the symbol table.
bool ELFObjectWriter::shouldRelocateWithSymbol(const MCAssembler &Asm,
const MCSymbolRefExpr *RefA,
- const MCSymbolData *SD,
- uint64_t C,
+ const MCSymbol *Sym, uint64_t C,
unsigned Type) const {
+ MCSymbolData *SD = Sym ? &Sym->getData() : nullptr;
+
// A PCRel relocation to an absolute value has no symbol (or section). We
// represent that with a relocation to a null section.
if (!RefA)
// An undefined symbol is not in any section, so the relocation has to point
// to the symbol itself.
- const MCSymbol &Sym = SD->getSymbol();
- if (Sym.isUndefined())
+ assert(Sym && "Expected a symbol");
+ if (Sym->isUndefined())
return true;
unsigned Binding = MCELF::GetBinding(*SD);
// If we change such a relocation to use the section, the linker would think
// that it pointed to another string and subtracting 42 at runtime will
// produce the wrong value.
- auto &Sec = cast<MCSectionELF>(Sym.getSection());
+ auto &Sec = cast<MCSectionELF>(Sym->getSection());
unsigned Flags = Sec.getFlags();
if (Flags & ELF::SHF_MERGE) {
if (C != 0)
// bit. With a symbol that is done by just having the symbol have that bit
// set, so we would lose the bit if we relocated with the section.
// FIXME: We could use the section but add the bit to the relocation value.
- if (Asm.isThumbFunc(&Sym))
+ if (Asm.isThumbFunc(Sym))
return true;
if (TargetObjectWriter->needsRelocateWithSymbol(*SD, Type))
Asm.getContext().reportFatalError(
Fixup.getLoc(), "Cannot represent a difference across sections");
- const MCSymbolData &SymBD = Asm.getSymbolData(SymB);
- if (::isWeak(SymBD))
+ if (::isWeak(SymB.getData()))
Asm.getContext().reportFatalError(
Fixup.getLoc(), "Cannot represent a subtraction with a weak symbol");
- uint64_t SymBOffset = Layout.getSymbolOffset(&SymBD);
+ uint64_t SymBOffset = Layout.getSymbolOffset(SymB);
uint64_t K = SymBOffset - FixupOffset;
IsPCRel = true;
C -= K;
// We either rejected the fixup or folded B into C at this point.
const MCSymbolRefExpr *RefA = Target.getSymA();
const MCSymbol *SymA = RefA ? &RefA->getSymbol() : nullptr;
- const MCSymbolData *SymAD = SymA ? &Asm.getSymbolData(*SymA) : nullptr;
unsigned Type = GetRelocType(Target, Fixup, IsPCRel);
- bool RelocateWithSymbol = shouldRelocateWithSymbol(Asm, RefA, SymAD, C, Type);
+ bool RelocateWithSymbol = shouldRelocateWithSymbol(Asm, RefA, SymA, C, Type);
if (!RelocateWithSymbol && SymA && !SymA->isUndefined())
- C += Layout.getSymbolOffset(SymAD);
+ C += Layout.getSymbolOffset(*SymA);
uint64_t Addend = 0;
if (hasRelocationAddend()) {
}
bool ELFObjectWriter::isInSymtab(const MCAsmLayout &Layout,
- const MCSymbolData &Data, bool Used,
+ const MCSymbol &Symbol, bool Used,
bool Renamed) {
- const MCSymbol &Symbol = Data.getSymbol();
+ const MCSymbolData &Data = Symbol.getData();
if (Symbol.isVariable()) {
const MCExpr *Expr = Symbol.getVariableValue();
if (const MCSymbolRefExpr *Ref = dyn_cast<MCSymbolRefExpr>(Expr)) {
return true;
}
-bool ELFObjectWriter::isLocal(const MCSymbolData &Data, bool isUsedInReloc) {
+bool ELFObjectWriter::isLocal(const MCSymbol &Symbol, bool isUsedInReloc) {
+ const MCSymbolData &Data = Symbol.getData();
if (Data.isExternal())
return false;
- const MCSymbol &Symbol = Data.getSymbol();
if (Symbol.isDefined())
return true;
bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol);
bool isSignature = RevGroupMap.count(&Symbol);
- if (!isInSymtab(Layout, SD,
- Used || WeakrefUsed || isSignature,
+ if (!isInSymtab(Layout, Symbol, Used || WeakrefUsed || isSignature,
Renames.count(&Symbol)))
continue;
ELFSymbolData MSD;
- MSD.SymbolData = &SD;
+ MSD.Symbol = &Symbol;
const MCSymbol *BaseSymbol = Layout.getBaseSymbol(Symbol);
// Undefined symbols are global, but this is the first place we
// are able to set it.
- bool Local = isLocal(SD, Used);
+ bool Local = isLocal(Symbol, Used);
if (!Local && MCELF::GetBinding(SD) == ELF::STB_LOCAL) {
assert(BaseSymbol);
MCSymbolData &BaseData = Asm.getSymbolData(*BaseSymbol);
FileSymbolData.push_back(StrTabBuilder.getOffset(*i));
for (ELFSymbolData &MSD : LocalSymbolData)
- MSD.StringIndex = MCELF::GetType(*MSD.SymbolData) == ELF::STT_SECTION
+ MSD.StringIndex = MCELF::GetType(MSD.Symbol->getData()) == ELF::STT_SECTION
? 0
: StrTabBuilder.getOffset(MSD.Name);
for (ELFSymbolData &MSD : ExternalSymbolData)
// symbols with non-local bindings.
unsigned Index = FileSymbolData.size() + 1;
for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i)
- LocalSymbolData[i].SymbolData->setIndex(Index++);
+ LocalSymbolData[i].Symbol->getData().setIndex(Index++);
for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i)
- ExternalSymbolData[i].SymbolData->setIndex(Index++);
+ ExternalSymbolData[i].Symbol->getData().setIndex(Index++);
for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
- UndefinedSymbolData[i].SymbolData->setIndex(Index++);
+ UndefinedSymbolData[i].Symbol->getData().setIndex(Index++);
}
-const MCSectionELF *
+MCSectionELF *
ELFObjectWriter::createRelocationSection(MCAssembler &Asm,
const MCSectionELF &Sec) {
if (Relocations[&Sec].empty())
if (Sec.getFlags() & ELF::SHF_GROUP)
Flags = ELF::SHF_GROUP;
- const MCSectionELF *RelaSection = Ctx.createELFRelSection(
+ MCSectionELF *RelaSection = Ctx.createELFRelSection(
RelaSectionName, hasRelocationAddend() ? ELF::SHT_RELA : ELF::SHT_REL,
Flags, EntrySize, Sec.getGroup(), &Sec);
MCSectionData &RelSD = Asm.getOrCreateSectionData(*RelaSection);
void ELFObjectWriter::writeSectionData(const MCAssembler &Asm,
const MCSectionData &SD,
const MCAsmLayout &Layout) {
- const MCSectionELF &Section =
- static_cast<const MCSectionELF &>(SD.getSection());
+ MCSectionELF &Section = static_cast<MCSectionELF &>(SD.getSection());
StringRef SectionName = Section.getSectionName();
// Compressing debug_frame requires handling alignment fragments which is
}
const MCSectionELF *ELFObjectWriter::createStringTable(MCContext &Ctx) {
- const MCSectionELF *StrtabSection =
+ MCSectionELF *StrtabSection =
Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0);
StringTableIndex = addToSectionTable(StrtabSection);
OS << StrTabBuilder.data();
const SectionIndexMapTy &SectionIndexMap,
uint32_t GroupSymbolIndex,
uint64_t Offset, uint64_t Size,
- uint64_t Alignment,
const MCSectionELF &Section) {
uint64_t sh_link = 0;
uint64_t sh_info = 0;
sh_link = SectionIndexMap.lookup(Section.getAssociatedSection());
WriteSecHdrEntry(ShStrTabBuilder.getOffset(Section.getSectionName()),
- Section.getType(),
- Section.getFlags(), 0, Offset, Size, sh_link, sh_info,
- Alignment, Section.getEntrySize());
+ Section.getType(), Section.getFlags(), 0, Offset, Size,
+ sh_link, sh_info, Section.getAlignment(),
+ Section.getEntrySize());
}
void ELFObjectWriter::writeSectionHeader(
(NumSections + 1) >= ELF::SHN_LORESERVE ? NumSections + 1 : 0;
WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, 0, 0, 0, 0);
- for (const MCSectionELF *Section : SectionTable) {
+ for (MCSectionELF *Section : SectionTable) {
const MCSectionData &SD = Asm.getOrCreateSectionData(*Section);
uint32_t GroupSymbolIndex;
unsigned Type = Section->getType();
: Offsets.second - Offsets.first;
writeSection(Asm, SectionIndexMap, GroupSymbolIndex, Offsets.first, Size,
- SD.getAlignment(), *Section);
+ *Section);
}
}
void ELFObjectWriter::WriteObject(MCAssembler &Asm,
const MCAsmLayout &Layout) {
MCContext &Ctx = Asm.getContext();
- const MCSectionELF *ShstrtabSection =
+ MCSectionELF *ShstrtabSection =
Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0);
ShstrtabIndex = addToSectionTable(ShstrtabSection);
SectionOffsetsTy SectionOffsets;
bool ComputedSymtab = false;
for (const MCSectionData &SD : Asm) {
- const MCSectionELF &Section =
- static_cast<const MCSectionELF &>(SD.getSection());
+ MCSectionELF &Section = static_cast<MCSectionELF &>(SD.getSection());
uint64_t Padding = OffsetToAlignment(OS.tell(), SD.getAlignment());
WriteZeros(Padding);
if (Type == ELF::SHT_GROUP || Type == ELF::SHT_REL || Type == ELF::SHT_RELA)
continue;
- const MCSectionELF *RelSection = createRelocationSection(Asm, Section);
+ MCSectionELF *RelSection = createRelocationSection(Asm, Section);
if (SignatureSymbol) {
Asm.getOrCreateSymbolData(*SignatureSymbol);
unsigned &GroupIdx = RevGroupMap[SignatureSymbol];
if (!GroupIdx) {
- const MCSectionELF *Group = Ctx.createELFGroupSection(SignatureSymbol);
+ MCSectionELF *Group = Ctx.createELFGroupSection(SignatureSymbol);
GroupIdx = addToSectionTable(Group);
MCSectionData *GroupD = &Asm.getOrCreateSectionData(*Group);
GroupD->setAlignment(4);
InSet, IsPCRel);
}
-bool ELFObjectWriter::isWeak(const MCSymbolData &SD) const {
+bool ELFObjectWriter::isWeak(const MCSymbol &Sym) const {
+ const MCSymbolData &SD = Sym.getData();
if (::isWeak(SD))
return true;
if (MCELF::GetBinding(SD) != ELF::STB_GLOBAL)
return false;
- const MCSymbol &Sym = SD.getSymbol();
if (!Sym.isInSection())
return false;
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