[llvm] r246554 - [MC] Allow MCObjectWriter's output stream to be swapped out

Yaron Keren via llvm-commits llvm-commits at lists.llvm.org
Tue Sep 1 15:48:02 PDT 2015


MCAssembler also has raw_ostream &OS and now it may diverge from
underlying MCObjectWriter &Writer mutable stream. Would it make sense for
MCAssembler to use Writer.getStream() instead of OS?


2015-09-01 19:19 GMT+03:00 David Majnemer via llvm-commits <
llvm-commits at lists.llvm.org>:

> Author: majnemer
> Date: Tue Sep  1 11:19:03 2015
> New Revision: 246554
>
> URL: http://llvm.org/viewvc/llvm-project?rev=246554&view=rev
> Log:
> [MC] Allow MCObjectWriter's output stream to be swapped out
>
> There are occasions where it is useful to consider the entirety of the
> contents of a section.  For example, compressed debug info needs the
> entire section available before it can compress it and write it out.
> The compressed debug info scenario was previously implemented by
> mirroring the implementation of writeSectionData in the ELFObjectWriter.
>
> Instead, allow the output stream to be swapped on demand.  This lets
> callers redirect the output stream to a more convenient location before
> it hits the object file.
>
> No functionality change is intended.
>
> Differential Revision: http://reviews.llvm.org/D12509
>
> Modified:
>     llvm/trunk/include/llvm/MC/MCObjectWriter.h
>     llvm/trunk/lib/MC/ELFObjectWriter.cpp
>     llvm/trunk/lib/MC/MachObjectWriter.cpp
>     llvm/trunk/lib/MC/WinCOFFObjectWriter.cpp
>
> Modified: llvm/trunk/include/llvm/MC/MCObjectWriter.h
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCObjectWriter.h?rev=246554&r1=246553&r2=246554&view=diff
>
> ==============================================================================
> --- llvm/trunk/include/llvm/MC/MCObjectWriter.h (original)
> +++ llvm/trunk/include/llvm/MC/MCObjectWriter.h Tue Sep  1 11:19:03 2015
> @@ -40,14 +40,14 @@ class MCObjectWriter {
>    MCObjectWriter(const MCObjectWriter &) = delete;
>    void operator=(const MCObjectWriter &) = delete;
>
> -protected:
> -  raw_pwrite_stream &OS;
> +  raw_pwrite_stream *OS;
>
> +protected:
>    unsigned IsLittleEndian : 1;
>
>  protected: // Can only create subclasses.
>    MCObjectWriter(raw_pwrite_stream &OS, bool IsLittleEndian)
> -      : OS(OS), IsLittleEndian(IsLittleEndian) {}
> +      : OS(&OS), IsLittleEndian(IsLittleEndian) {}
>
>  public:
>    virtual ~MCObjectWriter();
> @@ -57,7 +57,8 @@ public:
>
>    bool isLittleEndian() const { return IsLittleEndian; }
>
> -  raw_ostream &getStream() { return OS; }
> +  raw_pwrite_stream &getStream() { return *OS; }
> +  void setStream(raw_pwrite_stream &NewOS) { OS = &NewOS; }
>
>    /// \name High-Level API
>    /// @{
> @@ -113,30 +114,30 @@ public:
>    /// \name Binary Output
>    /// @{
>
> -  void write8(uint8_t Value) { OS << char(Value); }
> +  void write8(uint8_t Value) { *OS << char(Value); }
>
>    void writeLE16(uint16_t Value) {
> -    support::endian::Writer<support::little>(OS).write(Value);
> +    support::endian::Writer<support::little>(*OS).write(Value);
>    }
>
>    void writeLE32(uint32_t Value) {
> -    support::endian::Writer<support::little>(OS).write(Value);
> +    support::endian::Writer<support::little>(*OS).write(Value);
>    }
>
>    void writeLE64(uint64_t Value) {
> -    support::endian::Writer<support::little>(OS).write(Value);
> +    support::endian::Writer<support::little>(*OS).write(Value);
>    }
>
>    void writeBE16(uint16_t Value) {
> -    support::endian::Writer<support::big>(OS).write(Value);
> +    support::endian::Writer<support::big>(*OS).write(Value);
>    }
>
>    void writeBE32(uint32_t Value) {
> -    support::endian::Writer<support::big>(OS).write(Value);
> +    support::endian::Writer<support::big>(*OS).write(Value);
>    }
>
>    void writeBE64(uint64_t Value) {
> -    support::endian::Writer<support::big>(OS).write(Value);
> +    support::endian::Writer<support::big>(*OS).write(Value);
>    }
>
>    void write16(uint16_t Value) {
> @@ -164,9 +165,9 @@ public:
>      const char Zeros[16] = {0};
>
>      for (unsigned i = 0, e = N / 16; i != e; ++i)
> -      OS << StringRef(Zeros, 16);
> +      *OS << StringRef(Zeros, 16);
>
> -    OS << StringRef(Zeros, N % 16);
> +    *OS << StringRef(Zeros, N % 16);
>    }
>
>    void writeBytes(const SmallVectorImpl<char> &ByteVec,
> @@ -180,7 +181,7 @@ public:
>      assert(
>          (ZeroFillSize == 0 || Str.size() <= ZeroFillSize) &&
>          "data size greater than fill size, unexpected large write will
> occur");
> -    OS << Str;
> +    *OS << Str;
>      if (ZeroFillSize)
>        WriteZeros(ZeroFillSize - Str.size());
>    }
>
> Modified: llvm/trunk/lib/MC/ELFObjectWriter.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/ELFObjectWriter.cpp?rev=246554&r1=246553&r2=246554&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/MC/ELFObjectWriter.cpp (original)
> +++ llvm/trunk/lib/MC/ELFObjectWriter.cpp Tue Sep  1 11:19:03 2015
> @@ -157,9 +157,9 @@ class ELFObjectWriter : public MCObjectW
>
>      template <typename T> void write(T Val) {
>        if (IsLittleEndian)
> -        support::endian::Writer<support::little>(OS).write(Val);
> +        support::endian::Writer<support::little>(getStream()).write(Val);
>        else
> -        support::endian::Writer<support::big>(OS).write(Val);
> +        support::endian::Writer<support::big>(getStream()).write(Val);
>      }
>
>      void writeHeader(const MCAssembler &Asm);
> @@ -232,7 +232,7 @@ class ELFObjectWriter : public MCObjectW
>  }
>
>  void ELFObjectWriter::align(unsigned Alignment) {
> -  uint64_t Padding = OffsetToAlignment(OS.tell(), Alignment);
> +  uint64_t Padding = OffsetToAlignment(getStream().tell(), Alignment);
>    WriteZeros(Padding);
>  }
>
> @@ -764,7 +764,7 @@ void ELFObjectWriter::computeSymbolTable
>    SymbolTableIndex = addToSectionTable(SymtabSection);
>
>    align(SymtabSection->getAlignment());
> -  uint64_t SecStart = OS.tell();
> +  uint64_t SecStart = getStream().tell();
>
>    // The first entry is the undefined symbol entry.
>    Writer.writeSymbol(0, 0, 0, 0, 0, 0, false);
> @@ -911,7 +911,7 @@ void ELFObjectWriter::computeSymbolTable
>      assert(MSD.Symbol->getBinding() != ELF::STB_LOCAL);
>    }
>
> -  uint64_t SecEnd = OS.tell();
> +  uint64_t SecEnd = getStream().tell();
>    SectionOffsets[SymtabSection] = std::make_pair(SecStart, SecEnd);
>
>    ArrayRef<uint32_t> ShndxIndexes = Writer.getShndxIndexes();
> @@ -921,12 +921,12 @@ void ELFObjectWriter::computeSymbolTable
>    }
>    assert(SymtabShndxSectionIndex != 0);
>
> -  SecStart = OS.tell();
> +  SecStart = getStream().tell();
>    const MCSectionELF *SymtabShndxSection =
>        SectionTable[SymtabShndxSectionIndex - 1];
>    for (uint32_t Index : ShndxIndexes)
>      write(Index);
> -  SecEnd = OS.tell();
> +  SecEnd = getStream().tell();
>    SectionOffsets[SymtabShndxSection] = std::make_pair(SecStart, SecEnd);
>  }
>
> @@ -957,31 +957,6 @@ ELFObjectWriter::createRelocationSection
>    return RelaSection;
>  }
>
> -static SmallVector<char, 128>
> -getUncompressedData(const MCAsmLayout &Layout,
> -                    const MCSection::FragmentListType &Fragments) {
> -  SmallVector<char, 128> UncompressedData;
> -  for (const MCFragment &F : Fragments) {
> -    const SmallVectorImpl<char> *Contents;
> -    switch (F.getKind()) {
> -    case MCFragment::FT_Data:
> -      Contents = &cast<MCDataFragment>(F).getContents();
> -      break;
> -    case MCFragment::FT_Dwarf:
> -      Contents = &cast<MCDwarfLineAddrFragment>(F).getContents();
> -      break;
> -    case MCFragment::FT_DwarfFrame:
> -      Contents = &cast<MCDwarfCallFrameFragment>(F).getContents();
> -      break;
> -    default:
> -      llvm_unreachable(
> -          "Not expecting any other fragment types in a debug_* section");
> -    }
> -    UncompressedData.append(Contents->begin(), Contents->end());
> -  }
> -  return UncompressedData;
> -}
> -
>  // Include the debug info compression header:
>  // "ZLIB" followed by 8 bytes representing the uncompressed size of the
> section,
>  // useful for consumers to preallocate a buffer to decompress into.
> @@ -1016,27 +991,29 @@ void ELFObjectWriter::writeSectionData(c
>      return;
>    }
>
> -  // Gather the uncompressed data from all the fragments.
> -  const MCSection::FragmentListType &Fragments =
> Section.getFragmentList();
> -  SmallVector<char, 128> UncompressedData =
> -      getUncompressedData(Layout, Fragments);
> +  SmallVector<char, 128> UncompressedData;
> +  raw_svector_ostream VecOS(UncompressedData);
> +  raw_pwrite_stream &OldStream = getStream();
> +  setStream(VecOS);
> +  Asm.writeSectionData(&Section, Layout);
> +  setStream(OldStream);
>
>    SmallVector<char, 128> CompressedContents;
>    zlib::Status Success = zlib::compress(
>        StringRef(UncompressedData.data(), UncompressedData.size()),
>        CompressedContents);
>    if (Success != zlib::StatusOK) {
> -    Asm.writeSectionData(&Section, Layout);
> +    getStream() << UncompressedData;
>      return;
>    }
>
>    if (!prependCompressionHeader(UncompressedData.size(),
> CompressedContents)) {
> -    Asm.writeSectionData(&Section, Layout);
> +    getStream() << UncompressedData;
>      return;
>    }
>    Asm.getContext().renameELFSection(&Section,
>                                      (".z" +
> SectionName.drop_front(1)).str());
> -  OS << CompressedContents;
> +  getStream() << CompressedContents;
>  }
>
>  void ELFObjectWriter::WriteSecHdrEntry(uint32_t Name, uint32_t Type,
> @@ -1100,7 +1077,7 @@ void ELFObjectWriter::writeRelocations(c
>
>  const MCSectionELF *ELFObjectWriter::createStringTable(MCContext &Ctx) {
>    const MCSectionELF *StrtabSection = SectionTable[StringTableIndex - 1];
> -  OS << StrTabBuilder.data();
> +  getStream() << StrTabBuilder.data();
>    return StrtabSection;
>  }
>
> @@ -1209,12 +1186,12 @@ void ELFObjectWriter::writeObject(MCAsse
>      align(Section.getAlignment());
>
>      // Remember the offset into the file for this section.
> -    uint64_t SecStart = OS.tell();
> +    uint64_t SecStart = getStream().tell();
>
>      const MCSymbolELF *SignatureSymbol = Section.getGroup();
>      writeSectionData(Asm, Section, Layout);
>
> -    uint64_t SecEnd = OS.tell();
> +    uint64_t SecEnd = getStream().tell();
>      SectionOffsets[&Section] = std::make_pair(SecStart, SecEnd);
>
>      MCSectionELF *RelSection = createRelocationSection(Ctx, Section);
> @@ -1246,7 +1223,7 @@ void ELFObjectWriter::writeObject(MCAsse
>      align(Group->getAlignment());
>
>      // Remember the offset into the file for this section.
> -    uint64_t SecStart = OS.tell();
> +    uint64_t SecStart = getStream().tell();
>
>      const MCSymbol *SignatureSymbol = Group->getGroup();
>      assert(SignatureSymbol);
> @@ -1256,7 +1233,7 @@ void ELFObjectWriter::writeObject(MCAsse
>        write(SecIndex);
>      }
>
> -    uint64_t SecEnd = OS.tell();
> +    uint64_t SecEnd = getStream().tell();
>      SectionOffsets[Group] = std::make_pair(SecStart, SecEnd);
>    }
>
> @@ -1267,25 +1244,25 @@ void ELFObjectWriter::writeObject(MCAsse
>      align(RelSection->getAlignment());
>
>      // Remember the offset into the file for this section.
> -    uint64_t SecStart = OS.tell();
> +    uint64_t SecStart = getStream().tell();
>
>      writeRelocations(Asm, *RelSection->getAssociatedSection());
>
> -    uint64_t SecEnd = OS.tell();
> +    uint64_t SecEnd = getStream().tell();
>      SectionOffsets[RelSection] = std::make_pair(SecStart, SecEnd);
>    }
>
>    {
> -    uint64_t SecStart = OS.tell();
> +    uint64_t SecStart = getStream().tell();
>      const MCSectionELF *Sec = createStringTable(Ctx);
> -    uint64_t SecEnd = OS.tell();
> +    uint64_t SecEnd = getStream().tell();
>      SectionOffsets[Sec] = std::make_pair(SecStart, SecEnd);
>    }
>
>    uint64_t NaturalAlignment = is64Bit() ? 8 : 4;
>    align(NaturalAlignment);
>
> -  const unsigned SectionHeaderOffset = OS.tell();
> +  const unsigned SectionHeaderOffset = getStream().tell();
>
>    // ... then the section header table ...
>    writeSectionHeader(Layout, SectionIndexMap, SectionOffsets);
> @@ -1301,19 +1278,19 @@ void ELFObjectWriter::writeObject(MCAsse
>      uint64_t Val = SectionHeaderOffset;
>      if (sys::IsLittleEndianHost != IsLittleEndian)
>        sys::swapByteOrder(Val);
> -    OS.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
> -              offsetof(ELF::Elf64_Ehdr, e_shoff));
> +    getStream().pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
> +                       offsetof(ELF::Elf64_Ehdr, e_shoff));
>      NumSectionsOffset = offsetof(ELF::Elf64_Ehdr, e_shnum);
>    } else {
>      uint32_t Val = SectionHeaderOffset;
>      if (sys::IsLittleEndianHost != IsLittleEndian)
>        sys::swapByteOrder(Val);
> -    OS.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
> -              offsetof(ELF::Elf32_Ehdr, e_shoff));
> +    getStream().pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
> +                       offsetof(ELF::Elf32_Ehdr, e_shoff));
>      NumSectionsOffset = offsetof(ELF::Elf32_Ehdr, e_shnum);
>    }
> -  OS.pwrite(reinterpret_cast<char *>(&NumSections), sizeof(NumSections),
> -            NumSectionsOffset);
> +  getStream().pwrite(reinterpret_cast<char *>(&NumSections),
> +                     sizeof(NumSections), NumSectionsOffset);
>  }
>
>  bool ELFObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
>
> Modified: llvm/trunk/lib/MC/MachObjectWriter.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MachObjectWriter.cpp?rev=246554&r1=246553&r2=246554&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/MC/MachObjectWriter.cpp (original)
> +++ llvm/trunk/lib/MC/MachObjectWriter.cpp Tue Sep  1 11:19:03 2015
> @@ -129,7 +129,7 @@ void MachObjectWriter::writeHeader(MachO
>    // struct mach_header (28 bytes) or
>    // struct mach_header_64 (32 bytes)
>
> -  uint64_t Start = OS.tell();
> +  uint64_t Start = getStream().tell();
>    (void) Start;
>
>    write32(is64Bit() ? MachO::MH_MAGIC_64 : MachO::MH_MAGIC);
> @@ -144,8 +144,9 @@ void MachObjectWriter::writeHeader(MachO
>    if (is64Bit())
>      write32(0); // reserved
>
> -  assert(OS.tell() - Start ==
> -         (is64Bit()?sizeof(MachO::mach_header_64):
> sizeof(MachO::mach_header)));
> +  assert(
> +      getStream().tell() - Start ==
> +      (is64Bit() ? sizeof(MachO::mach_header_64) :
> sizeof(MachO::mach_header)));
>  }
>
>  /// writeSegmentLoadCommand - Write a segment load command.
> @@ -159,7 +160,7 @@ void MachObjectWriter::writeSegmentLoadC
>    // struct segment_command (56 bytes) or
>    // struct segment_command_64 (72 bytes)
>
> -  uint64_t Start = OS.tell();
> +  uint64_t Start = getStream().tell();
>    (void) Start;
>
>    unsigned SegmentLoadCommandSize =
> @@ -190,7 +191,7 @@ void MachObjectWriter::writeSegmentLoadC
>    write32(NumSections);
>    write32(0); // flags
>
> -  assert(OS.tell() - Start == SegmentLoadCommandSize);
> +  assert(getStream().tell() - Start == SegmentLoadCommandSize);
>  }
>
>  void MachObjectWriter::writeSection(const MCAsmLayout &Layout,
> @@ -210,7 +211,7 @@ void MachObjectWriter::writeSection(cons
>    // struct section (68 bytes) or
>    // struct section_64 (80 bytes)
>
> -  uint64_t Start = OS.tell();
> +  uint64_t Start = getStream().tell();
>    (void) Start;
>
>    writeBytes(Section.getSectionName(), 16);
> @@ -234,8 +235,8 @@ void MachObjectWriter::writeSection(cons
>    if (is64Bit())
>      write32(0); // reserved3
>
> -  assert(OS.tell() - Start == (is64Bit() ? sizeof(MachO::section_64) :
> -                               sizeof(MachO::section)));
> +  assert(getStream().tell() - Start ==
> +         (is64Bit() ? sizeof(MachO::section_64) :
> sizeof(MachO::section)));
>  }
>
>  void MachObjectWriter::writeSymtabLoadCommand(uint32_t SymbolOffset,
> @@ -244,7 +245,7 @@ void MachObjectWriter::writeSymtabLoadCo
>                                                uint32_t StringTableSize) {
>    // struct symtab_command (24 bytes)
>
> -  uint64_t Start = OS.tell();
> +  uint64_t Start = getStream().tell();
>    (void) Start;
>
>    write32(MachO::LC_SYMTAB);
> @@ -254,7 +255,7 @@ void MachObjectWriter::writeSymtabLoadCo
>    write32(StringTableOffset);
>    write32(StringTableSize);
>
> -  assert(OS.tell() - Start == sizeof(MachO::symtab_command));
> +  assert(getStream().tell() - Start == sizeof(MachO::symtab_command));
>  }
>
>  void MachObjectWriter::writeDysymtabLoadCommand(uint32_t FirstLocalSymbol,
> @@ -267,7 +268,7 @@ void MachObjectWriter::writeDysymtabLoad
>                                                  uint32_t
> NumIndirectSymbols) {
>    // struct dysymtab_command (80 bytes)
>
> -  uint64_t Start = OS.tell();
> +  uint64_t Start = getStream().tell();
>    (void) Start;
>
>    write32(MachO::LC_DYSYMTAB);
> @@ -291,7 +292,7 @@ void MachObjectWriter::writeDysymtabLoad
>    write32(0); // locreloff
>    write32(0); // nlocrel
>
> -  assert(OS.tell() - Start == sizeof(MachO::dysymtab_command));
> +  assert(getStream().tell() - Start == sizeof(MachO::dysymtab_command));
>  }
>
>  MachObjectWriter::MachSymbolData *
> @@ -387,7 +388,7 @@ void MachObjectWriter::writeNlist(MachSy
>  void MachObjectWriter::writeLinkeditLoadCommand(uint32_t Type,
>                                                  uint32_t DataOffset,
>                                                  uint32_t DataSize) {
> -  uint64_t Start = OS.tell();
> +  uint64_t Start = getStream().tell();
>    (void) Start;
>
>    write32(Type);
> @@ -395,7 +396,7 @@ void MachObjectWriter::writeLinkeditLoad
>    write32(DataOffset);
>    write32(DataSize);
>
> -  assert(OS.tell() - Start == sizeof(MachO::linkedit_data_command));
> +  assert(getStream().tell() - Start ==
> sizeof(MachO::linkedit_data_command));
>  }
>
>  static unsigned ComputeLinkerOptionsLoadCommandSize(
> @@ -411,7 +412,7 @@ void MachObjectWriter::writeLinkerOption
>    const std::vector<std::string> &Options)
>  {
>    unsigned Size = ComputeLinkerOptionsLoadCommandSize(Options, is64Bit());
> -  uint64_t Start = OS.tell();
> +  uint64_t Start = getStream().tell();
>    (void) Start;
>
>    write32(MachO::LC_LINKER_OPTION);
> @@ -427,7 +428,7 @@ void MachObjectWriter::writeLinkerOption
>    // Pad to a multiple of the pointer size.
>    writeBytes("", OffsetToAlignment(BytesWritten, is64Bit() ? 8 : 4));
>
> -  assert(OS.tell() - Start == Size);
> +  assert(getStream().tell() - Start == Size);
>  }
>
>  void MachObjectWriter::recordRelocation(MCAssembler &Asm,
> @@ -906,12 +907,12 @@ void MachObjectWriter::writeObject(MCAss
>    // Write out the loh commands, if there is one.
>    if (LOHSize) {
>  #ifndef NDEBUG
> -    unsigned Start = OS.tell();
> +    unsigned Start = getStream().tell();
>  #endif
>      Asm.getLOHContainer().emit(*this, Layout);
>      // Pad to a multiple of the pointer size.
>      writeBytes("", OffsetToAlignment(LOHRawSize, is64Bit() ? 8 : 4));
> -    assert(OS.tell() - Start == LOHSize);
> +    assert(getStream().tell() - Start == LOHSize);
>    }
>
>    // Write the symbol table data, if used.
> @@ -947,7 +948,7 @@ void MachObjectWriter::writeObject(MCAss
>          writeNlist(Entry, Layout);
>
>      // Write the string table.
> -    OS << StringTable.data();
> +    getStream() << StringTable.data();
>    }
>  }
>
>
> Modified: llvm/trunk/lib/MC/WinCOFFObjectWriter.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/WinCOFFObjectWriter.cpp?rev=246554&r1=246553&r2=246554&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/MC/WinCOFFObjectWriter.cpp (original)
> +++ llvm/trunk/lib/MC/WinCOFFObjectWriter.cpp Tue Sep  1 11:19:03 2015
> @@ -1037,10 +1037,11 @@ void WinCOFFObjectWriter::writeObject(MC
>          continue;
>
>        if ((*i)->Header.PointerToRawData != 0) {
> -        assert(OS.tell() <= (*i)->Header.PointerToRawData &&
> +        assert(getStream().tell() <= (*i)->Header.PointerToRawData &&
>                 "Section::PointerToRawData is insane!");
>
> -        unsigned SectionDataPadding = (*i)->Header.PointerToRawData -
> OS.tell();
> +        unsigned SectionDataPadding =
> +            (*i)->Header.PointerToRawData - getStream().tell();
>          assert(SectionDataPadding < 4 &&
>                 "Should only need at most three bytes of padding!");
>
> @@ -1050,7 +1051,7 @@ void WinCOFFObjectWriter::writeObject(MC
>        }
>
>        if ((*i)->Relocations.size() > 0) {
> -        assert(OS.tell() == (*i)->Header.PointerToRelocations &&
> +        assert(getStream().tell() == (*i)->Header.PointerToRelocations &&
>                 "Section::PointerToRelocations is insane!");
>
>          if ((*i)->Relocations.size() >= 0xffff) {
> @@ -1071,14 +1072,14 @@ void WinCOFFObjectWriter::writeObject(MC
>      }
>    }
>
> -  assert(OS.tell() == Header.PointerToSymbolTable &&
> +  assert(getStream().tell() == Header.PointerToSymbolTable &&
>           "Header::PointerToSymbolTable is insane!");
>
>    for (auto &Symbol : Symbols)
>      if (Symbol->getIndex() != -1)
>        WriteSymbol(*Symbol);
>
> -  OS.write(Strings.data().data(), Strings.data().size());
> +  getStream().write(Strings.data().data(), Strings.data().size());
>  }
>
>  MCWinCOFFObjectTargetWriter::MCWinCOFFObjectTargetWriter(unsigned
> Machine_)
>
>
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