Exemplo n.º 1
0
static bool collectRelocatedSymbols(const ObjectFile *Obj,
                                    const SectionRef &Sec, uint64_t SecAddress,
                                    uint64_t SymAddress, uint64_t SymSize,
                                    StringRef *I, StringRef *E) {
  uint64_t SymOffset = SymAddress - SecAddress;
  uint64_t SymEnd = SymOffset + SymSize;
  for (const SectionRef &SR : getRelocSections(Obj, Sec)) {
    for (const object::RelocationRef &Reloc : SR.relocations()) {
      if (I == E)
        break;
      const object::symbol_iterator RelocSymI = Reloc.getSymbol();
      if (RelocSymI == Obj->symbol_end())
        continue;
      StringRef RelocSymName;
      if (error(RelocSymI->getName(RelocSymName)))
        return true;
      uint64_t Offset;
      if (error(Reloc.getOffset(Offset)))
        return true;
      if (Offset >= SymOffset && Offset < SymEnd) {
        *I = RelocSymName;
        ++I;
      }
    }
  }
  return false;
}
Exemplo n.º 2
0
static bool collectRelocationOffsets(
    const ObjectFile *Obj, object::section_iterator SecI, StringRef SymName,
    std::map<std::pair<StringRef, uint64_t>, StringRef> &Collection) {
    for (const object::RelocationRef &Reloc : SecI->relocations()) {
        const object::symbol_iterator RelocSymI = Reloc.getSymbol();
        if (RelocSymI == Obj->symbol_end())
            continue;
        StringRef RelocSymName;
        if (error(RelocSymI->getName(RelocSymName)))
            return true;
        uint64_t Offset;
        if (error(Reloc.getOffset(Offset)))
            return true;
        Collection[std::make_pair(SymName, Offset)] = RelocSymName;
    }
    return false;
}
Exemplo n.º 3
0
static bool collectRelocatedSymbols(const ObjectFile *Obj,
                                    object::section_iterator SecI, StringRef *I,
                                    StringRef *E) {
    for (const object::RelocationRef &Reloc : SecI->relocations()) {
        if (I == E)
            break;
        const object::symbol_iterator RelocSymI = Reloc.getSymbol();
        if (RelocSymI == Obj->symbol_end())
            continue;
        StringRef RelocSymName;
        if (error(RelocSymI->getName(RelocSymName)))
            return true;
        *I = RelocSymName;
        ++I;
    }
    return false;
}
Exemplo n.º 4
0
static void collectRelocationOffsets(
    const ObjectFile *Obj, const SectionRef &Sec, uint64_t SecAddress,
    uint64_t SymAddress, uint64_t SymSize, StringRef SymName,
    std::map<std::pair<StringRef, uint64_t>, StringRef> &Collection) {
  uint64_t SymOffset = SymAddress - SecAddress;
  uint64_t SymEnd = SymOffset + SymSize;
  for (const SectionRef &SR : SectionRelocMap[Sec]) {
    for (const object::RelocationRef &Reloc : SR.relocations()) {
      const object::symbol_iterator RelocSymI = Reloc.getSymbol();
      if (RelocSymI == Obj->symbol_end())
        continue;
      ErrorOr<StringRef> RelocSymName = RelocSymI->getName();
      error(RelocSymName.getError());
      uint64_t Offset = Reloc.getOffset();
      if (Offset >= SymOffset && Offset < SymEnd)
        Collection[std::make_pair(SymName, Offset - SymOffset)] = *RelocSymName;
    }
  }
}
Exemplo n.º 5
0
static void collectRelocatedSymbols(const ObjectFile *Obj,
                                    const SectionRef &Sec, uint64_t SecAddress,
                                    uint64_t SymAddress, uint64_t SymSize,
                                    StringRef *I, StringRef *E) {
  uint64_t SymOffset = SymAddress - SecAddress;
  uint64_t SymEnd = SymOffset + SymSize;
  for (const SectionRef &SR : SectionRelocMap[Sec]) {
    for (const object::RelocationRef &Reloc : SR.relocations()) {
      if (I == E)
        break;
      const object::symbol_iterator RelocSymI = Reloc.getSymbol();
      if (RelocSymI == Obj->symbol_end())
        continue;
      ErrorOr<StringRef> RelocSymName = RelocSymI->getName();
      error(RelocSymName.getError());
      uint64_t Offset = Reloc.getOffset();
      if (Offset >= SymOffset && Offset < SymEnd) {
        *I = *RelocSymName;
        ++I;
      }
    }
  }
}
Exemplo n.º 6
0
static bool collectRelocationOffsets(
    const ObjectFile *Obj, const SectionRef &Sec, uint64_t SecAddress,
    uint64_t SymAddress, uint64_t SymSize, StringRef SymName,
    std::map<std::pair<StringRef, uint64_t>, StringRef> &Collection) {
  uint64_t SymOffset = SymAddress - SecAddress;
  uint64_t SymEnd = SymOffset + SymSize;
  for (const SectionRef &SR : getRelocSections(Obj, Sec)) {
    for (const object::RelocationRef &Reloc : SR.relocations()) {
      const object::symbol_iterator RelocSymI = Reloc.getSymbol();
      if (RelocSymI == Obj->symbol_end())
        continue;
      StringRef RelocSymName;
      if (error(RelocSymI->getName(RelocSymName)))
        return true;
      uint64_t Offset;
      if (error(Reloc.getOffset(Offset)))
        return true;
      if (Offset >= SymOffset && Offset < SymEnd)
        Collection[std::make_pair(SymName, Offset - SymOffset)] = RelocSymName;
    }
  }
  return false;
}
Exemplo n.º 7
0
static void dumpVTables(const ObjectFile *Obj) {
  std::map<std::pair<StringRef, uint64_t>, StringRef> VFTableEntries;
  std::map<StringRef, ArrayRef<aligned_little32_t>> VBTables;
  for (const object::SymbolRef &Sym : Obj->symbols()) {
    StringRef SymName;
    if (error(Sym.getName(SymName)))
      return;
    // VFTables in the MS-ABI start with '??_7' and are contained within their
    // own COMDAT section.  We then determine the contents of the VFTable by
    // looking at each relocation in the section.
    if (SymName.startswith("??_7")) {
      object::section_iterator SecI(Obj->section_begin());
      if (error(Sym.getSection(SecI)))
        return;
      if (SecI == Obj->section_end())
        continue;
      // Each relocation either names a virtual method or a thunk.  We note the
      // offset into the section and the symbol used for the relocation.
      for (const object::RelocationRef &Reloc : SecI->relocations()) {
        const object::symbol_iterator RelocSymI = Reloc.getSymbol();
        if (RelocSymI == Obj->symbol_end())
          continue;
        StringRef RelocSymName;
        if (error(RelocSymI->getName(RelocSymName)))
          return;
        uint64_t Offset;
        if (error(Reloc.getOffset(Offset)))
          return;
        VFTableEntries[std::make_pair(SymName, Offset)] = RelocSymName;
      }
    }
    // VBTables in the MS-ABI start with '??_8' and are filled with 32-bit
    // offsets of virtual bases.
    else if (SymName.startswith("??_8")) {
      object::section_iterator SecI(Obj->section_begin());
      if (error(Sym.getSection(SecI)))
        return;
      if (SecI == Obj->section_end())
        continue;
      StringRef SecContents;
      if (error(SecI->getContents(SecContents)))
        return;

      ArrayRef<aligned_little32_t> VBTableData(
          reinterpret_cast<const aligned_little32_t *>(SecContents.data()),
          SecContents.size() / sizeof(aligned_little32_t));
      VBTables[SymName] = VBTableData;
    }
  }
  for (
      const std::pair<std::pair<StringRef, uint64_t>, StringRef> &VFTableEntry :
      VFTableEntries) {
    StringRef VFTableName = VFTableEntry.first.first;
    uint64_t Offset = VFTableEntry.first.second;
    StringRef SymName = VFTableEntry.second;
    outs() << VFTableName << '[' << Offset << "]: " << SymName << '\n';
  }
  for (const std::pair<StringRef, ArrayRef<aligned_little32_t>> &VBTable :
       VBTables) {
    StringRef VBTableName = VBTable.first;
    uint32_t Idx = 0;
    for (aligned_little32_t Offset : VBTable.second) {
      outs() << VBTableName << '[' << Idx << "]: " << Offset << '\n';
      Idx += sizeof(Offset);
    }
  }
}
Exemplo n.º 8
0
void
XdfObject::Output(llvm::raw_fd_ostream& os,
                  bool all_syms,
                  DebugFormat& dbgfmt,
                  Diagnostic& diags)
{
    all_syms = true;   // force all syms into symbol table

    // Get number of symbols and set symbol index in symbol data.
    unsigned long symtab_count = 0;
    for (Object::symbol_iterator sym = m_object.symbols_begin(),
         end = m_object.symbols_end(); sym != end; ++sym)
    {
        int vis = sym->getVisibility();
        if (vis & Symbol::COMMON)
        {
            diags.Report(sym->getDeclSource(),
                         diag::err_xdf_common_unsupported);
            continue;
        }
        if (all_syms || (vis != Symbol::LOCAL && !(vis & Symbol::DLOCAL)))
        {
            // Save index in symrec data
            sym->AddAssocData(
                std::auto_ptr<XdfSymbol>(new XdfSymbol(symtab_count)));

            ++symtab_count;
        }
    }

    // Number sections
    long scnum = 0;
    for (Object::section_iterator i = m_object.sections_begin(),
         end = m_object.sections_end(); i != end; ++i)
    {
        XdfSection* xsect = i->getAssocData<XdfSection>();
        assert(xsect != 0);
        xsect->scnum = scnum++;
    }

    // Allocate space for headers by seeking forward
    os.seek(FILEHEAD_SIZE+SECTHEAD_SIZE*scnum);
    if (os.has_error())
    {
        diags.Report(SourceLocation(), diag::err_file_output_seek);
        return;
    }

    XdfOutput out(os, m_object, diags);

    // Get file offset of start of string table
    unsigned long strtab_offset =
        FILEHEAD_SIZE + SECTHEAD_SIZE*scnum + SYMBOL_SIZE*symtab_count;

    // Output symbol table
    for (Object::const_symbol_iterator sym = m_object.symbols_begin(),
         end = m_object.symbols_end(); sym != end; ++sym)
    {
        out.OutputSymbol(*sym, all_syms, &strtab_offset);
    }

    // Output string table
    for (Object::const_symbol_iterator sym = m_object.symbols_begin(),
         end = m_object.symbols_end(); sym != end; ++sym)
    {
        if (all_syms || sym->getVisibility() != Symbol::LOCAL)
            os << sym->getName() << '\0';
    }

    // Output section data/relocs
    for (Object::section_iterator i=m_object.sections_begin(),
         end=m_object.sections_end(); i != end; ++i)
    {
        out.OutputSection(*i);
    }

    // Write headers
    os.seek(0);
    if (os.has_error())
    {
        diags.Report(SourceLocation(), diag::err_file_output_seek);
        return;
    }

    // Output object header
    Bytes& scratch = out.getScratch();
    scratch.setLittleEndian();
    Write32(scratch, XDF_MAGIC);        // magic number
    Write32(scratch, scnum);            // number of sects
    Write32(scratch, symtab_count);     // number of symtabs
    // size of sect headers + symbol table + strings
    Write32(scratch, strtab_offset-FILEHEAD_SIZE);
    assert(scratch.size() == FILEHEAD_SIZE);
    os << scratch;

    // Output section headers
    for (Object::const_section_iterator i=m_object.sections_begin(),
         end=m_object.sections_end(); i != end; ++i)
    {
        const XdfSection* xsect = i->getAssocData<XdfSection>();
        assert(xsect != 0);

        Bytes& scratch2 = out.getScratch();
        xsect->Write(scratch2, *i);
        assert(scratch2.size() == SECTHEAD_SIZE);
        os << scratch2;
    }
}