static typename ELFT::uint getSymVA(const SymbolBody &Body,
typename ELFT::uint &Addend) {
typedef typename ELFT::uint uintX_t;
switch (Body.kind()) {
case SymbolBody::DefinedSyntheticKind: {
auto &D = cast<DefinedSynthetic<ELFT>>(Body);
const OutputSectionBase<ELFT> *Sec = D.Section;
if (!Sec)
return D.Value;
if (D.Value == DefinedSynthetic<ELFT>::SectionEnd)
return Sec->getVA() + Sec->getSize();
return Sec->getVA() + D.Value;
}
case SymbolBody::DefinedRegularKind: {
auto &D = cast<DefinedRegular<ELFT>>(Body);
InputSectionBase<ELFT> *SC = D.Section;
// According to the ELF spec reference to a local symbol from outside
// the group are not allowed. Unfortunately .eh_frame breaks that rule
// and must be treated specially. For now we just replace the symbol with
// 0.
if (SC == &InputSection<ELFT>::Discarded)
return 0;
// This is an absolute symbol.
if (!SC)
return D.Value;
uintX_t Offset = D.Value;
if (D.isSection()) {
Offset += Addend;
Addend = 0;
}
uintX_t VA = SC->OutSec->getVA() + SC->getOffset(Offset);
if (D.isTls())
return VA - Out<ELFT>::TlsPhdr->p_vaddr;
return VA;
}
case SymbolBody::DefinedCommonKind:
return Out<ELFT>::Bss->getVA() + cast<DefinedCommon>(Body).OffsetInBss;
case SymbolBody::SharedKind: {
auto &SS = cast<SharedSymbol<ELFT>>(Body);
if (!SS.NeedsCopyOrPltAddr)
return 0;
if (SS.isFunc())
return Body.getPltVA<ELFT>();
return Out<ELFT>::Bss->getVA() + SS.OffsetInBss;
}
case SymbolBody::UndefinedKind:
return 0;
case SymbolBody::LazyArchiveKind:
case SymbolBody::LazyObjectKind:
assert(Body.symbol()->IsUsedInRegularObj && "lazy symbol reached writer");
return 0;
case SymbolBody::DefinedBitcodeKind:
llvm_unreachable("should have been replaced");
}
llvm_unreachable("invalid symbol kind");
}
// Rename SYM as __wrap_SYM. The original symbol is preserved as __real_SYM.
// Used to implement --wrap.
template <class ELFT> void SymbolTable<ELFT>::wrap(StringRef Name) {
SymbolBody *B = find(Name);
if (!B)
return;
StringSaver Saver(Alloc);
Symbol *Sym = B->symbol();
Symbol *Real = addUndefined(Saver.save("__real_" + Name));
Symbol *Wrap = addUndefined(Saver.save("__wrap_" + Name));
// We rename symbols by replacing the old symbol's SymbolBody with the new
// symbol's SymbolBody. This causes all SymbolBody pointers referring to the
// old symbol to instead refer to the new symbol.
memcpy(Real->Body.buffer, Sym->Body.buffer, sizeof(Sym->Body));
memcpy(Sym->Body.buffer, Wrap->Body.buffer, sizeof(Wrap->Body));
}
static typename ELFT::uint getSymVA(const SymbolBody &Body,
typename ELFT::uint &Addend) {
typedef typename ELFT::uint uintX_t;
switch (Body.kind()) {
case SymbolBody::DefinedSyntheticKind: {
auto &D = cast<DefinedSynthetic>(Body);
const OutputSectionBase *Sec = D.Section;
if (!Sec)
return D.Value;
if (D.Value == uintX_t(-1))
return Sec->Addr + Sec->Size;
return Sec->Addr + D.Value;
}
case SymbolBody::DefinedRegularKind: {
auto &D = cast<DefinedRegular<ELFT>>(Body);
InputSectionBase<ELFT> *IS = D.Section;
// According to the ELF spec reference to a local symbol from outside
// the group are not allowed. Unfortunately .eh_frame breaks that rule
// and must be treated specially. For now we just replace the symbol with
// 0.
if (IS == &InputSection<ELFT>::Discarded)
return 0;
// This is an absolute symbol.
if (!IS)
return D.Value;
uintX_t Offset = D.Value;
if (D.isSection()) {
Offset += Addend;
Addend = 0;
}
uintX_t VA = (IS->OutSec ? IS->OutSec->Addr : 0) + IS->getOffset(Offset);
if (D.isTls() && !Config->Relocatable) {
if (!Out<ELFT>::TlsPhdr)
fatal(toString(D.File) +
" has a STT_TLS symbol but doesn't have a PT_TLS section");
return VA - Out<ELFT>::TlsPhdr->p_vaddr;
}
return VA;
}
case SymbolBody::DefinedCommonKind:
if (!Config->DefineCommon)
return 0;
return In<ELFT>::Common->OutSec->Addr + In<ELFT>::Common->OutSecOff +
cast<DefinedCommon>(Body).Offset;
case SymbolBody::SharedKind: {
auto &SS = cast<SharedSymbol<ELFT>>(Body);
if (!SS.NeedsCopyOrPltAddr)
return 0;
if (SS.isFunc())
return Body.getPltVA<ELFT>();
return SS.getBssSectionForCopy()->Addr + SS.CopyOffset;
}
case SymbolBody::UndefinedKind:
return 0;
case SymbolBody::LazyArchiveKind:
case SymbolBody::LazyObjectKind:
assert(Body.symbol()->IsUsedInRegularObj && "lazy symbol reached writer");
return 0;
}
llvm_unreachable("invalid symbol kind");
}
