예제 #1
0
bool ELFObjectWriter::isInSymtab(const MCAsmLayout &Layout,
                                 const MCSymbolELF &Symbol, bool Used,
                                 bool Renamed) {
  if (Symbol.isVariable()) {
    const MCExpr *Expr = Symbol.getVariableValue();
    if (const MCSymbolRefExpr *Ref = dyn_cast<MCSymbolRefExpr>(Expr)) {
      if (Ref->getKind() == MCSymbolRefExpr::VK_WEAKREF)
        return false;
    }
  }

  if (Used)
    return true;

  if (Renamed)
    return false;

  if (Symbol.isVariable() && Symbol.isUndefined()) {
    // FIXME: this is here just to diagnose the case of a var = commmon_sym.
    Layout.getBaseSymbol(Symbol);
    return false;
  }

  if (Symbol.isUndefined() && !Symbol.isBindingSet())
    return false;

  if (Symbol.isTemporary())
    return false;

  if (Symbol.getType() == ELF::STT_SECTION)
    return false;

  return true;
}
예제 #2
0
// True if the assembler knows nothing about the final value of the symbol.
// This doesn't cover the comdat issues, since in those cases the assembler
// can at least know that all symbols in the section will move together.
static bool isWeak(const MCSymbolELF &Sym) {
  if (Sym.getType() == ELF::STT_GNU_IFUNC)
    return true;

  switch (Sym.getBinding()) {
  default:
    llvm_unreachable("Unknown binding");
  case ELF::STB_LOCAL:
    return false;
  case ELF::STB_GLOBAL:
    return false;
  case ELF::STB_WEAK:
  case ELF::STB_GNU_UNIQUE:
    return true;
  }
}