示例#1
0
void
SymbolFileDWARFDwo::LoadSectionData (lldb::SectionType sect_type, DWARFDataExtractor& data)
{
    const SectionList* section_list = m_obj_file->GetSectionList(false /* update_module_section_list */);
    if (section_list)
    {
        SectionSP section_sp (section_list->FindSectionByType(sect_type, true));
        if (section_sp)
        {
            // See if we memory mapped the DWARF segment?
            if (m_dwarf_data.GetByteSize())
            {
                data.SetData(m_dwarf_data, section_sp->GetOffset(), section_sp->GetFileSize());
                return;
            }

            if (m_obj_file->ReadSectionData(section_sp.get(), data) != 0)
                return;

            data.Clear();
        }
    }

    SymbolFileDWARF::LoadSectionData(sect_type, data);
}
bool
DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor& data, lldb::offset_t *offset_ptr, dw_uleb128_t code)
{
    m_code = code;
    m_attributes.clear();
    if (m_code)
    {
        m_tag = data.GetULEB128(offset_ptr);
        m_has_children = data.GetU8(offset_ptr);

        while (data.ValidOffset(*offset_ptr))
        {
            dw_attr_t attr = data.GetULEB128(offset_ptr);
            dw_form_t form = data.GetULEB128(offset_ptr);

            if (attr && form)
                m_attributes.push_back(DWARFAttribute(attr, form));
            else
                break;
        }

        return m_tag != 0;
    }
    else
    {
        m_tag = 0;
        m_has_children = 0;
    }

    return false;
}
示例#3
0
Error DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
                                   uint32_t *offset_ptr) {
  clear();
  if (!data.isValidOffset(*offset_ptr))
    return createStringError(errc::invalid_argument,
                       "invalid range list offset 0x%" PRIx32, *offset_ptr);

  AddressSize = data.getAddressSize();
  if (AddressSize != 4 && AddressSize != 8)
    return createStringError(errc::invalid_argument,
                       "invalid address size: %" PRIu8, AddressSize);
  Offset = *offset_ptr;
  while (true) {
    RangeListEntry Entry;
    Entry.SectionIndex = -1ULL;

    uint32_t prev_offset = *offset_ptr;
    Entry.StartAddress = data.getRelocatedAddress(offset_ptr);
    Entry.EndAddress =
        data.getRelocatedAddress(offset_ptr, &Entry.SectionIndex);

    // Check that both values were extracted correctly.
    if (*offset_ptr != prev_offset + 2 * AddressSize) {
      clear();
      return createStringError(errc::invalid_argument,
                         "invalid range list entry at offset 0x%" PRIx32,
                         prev_offset);
    }
    if (Entry.isEndOfListEntry())
      break;
    Entries.push_back(Entry);
  }
  return Error::success();
}
bool DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
                                  uint32_t *offset_ptr) {
  clear();
  if (!data.isValidOffset(*offset_ptr))
    return false;
  AddressSize = data.getAddressSize();
  if (AddressSize != 4 && AddressSize != 8)
    return false;
  Offset = *offset_ptr;
  while (true) {
    RangeListEntry entry;
    uint32_t prev_offset = *offset_ptr;
    entry.StartAddress =
        data.getRelocatedAddress(offset_ptr, &entry.SectionIndex);
    entry.EndAddress = data.getRelocatedAddress(offset_ptr);

    // Check that both values were extracted correctly.
    if (*offset_ptr != prev_offset + 2 * AddressSize) {
      clear();
      return false;
    }
    if (entry.isEndOfListEntry())
      break;
    Entries.push_back(entry);
  }
  return true;
}
示例#5
0
// Parse v2-v4 directory and file tables.
static void
parseV2DirFileTables(const DWARFDataExtractor &DebugLineData,
                     uint32_t *OffsetPtr, uint64_t EndPrologueOffset,
                     DWARFDebugLine::ContentTypeTracker &ContentTypes,
                     std::vector<DWARFFormValue> &IncludeDirectories,
                     std::vector<DWARFDebugLine::FileNameEntry> &FileNames) {
  while (*OffsetPtr < EndPrologueOffset) {
    StringRef S = DebugLineData.getCStrRef(OffsetPtr);
    if (S.empty())
      break;
    DWARFFormValue Dir =
        DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, S.data());
    IncludeDirectories.push_back(Dir);
  }

  while (*OffsetPtr < EndPrologueOffset) {
    StringRef Name = DebugLineData.getCStrRef(OffsetPtr);
    if (Name.empty())
      break;
    DWARFDebugLine::FileNameEntry FileEntry;
    FileEntry.Name =
        DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, Name.data());
    FileEntry.DirIdx = DebugLineData.getULEB128(OffsetPtr);
    FileEntry.ModTime = DebugLineData.getULEB128(OffsetPtr);
    FileEntry.Length = DebugLineData.getULEB128(OffsetPtr);
    FileNames.push_back(FileEntry);
  }

  ContentTypes.HasModTime = true;
  ContentTypes.HasLength = true;
}
bool
DWARFDebugPubnames::Extract(const DWARFDataExtractor& data)
{
    Timer scoped_timer (__PRETTY_FUNCTION__,
                        "DWARFDebugPubnames::Extract (byte_size = %" PRIu64 ")",
                        (uint64_t)data.GetByteSize());
    Log *log (LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_PUBNAMES));
    if (log)
        log->Printf("DWARFDebugPubnames::Extract (byte_size = %" PRIu64 ")", (uint64_t)data.GetByteSize());

    if (data.ValidOffset(0))
    {
        lldb::offset_t offset = 0;

        DWARFDebugPubnamesSet set;
        while (data.ValidOffset(offset))
        {
            if (set.Extract(data, &offset))
            {
                m_sets.push_back(set);
                offset = set.GetOffsetOfNextEntry();
            }
            else
                break;
        }
        if (log)
            Dump (log);
        return true;
    }
    return false;
}
示例#7
0
bool DWARFTypeUnit::extractImpl(const DWARFDataExtractor &debug_info,
                                uint32_t *offset_ptr) {
  if (!DWARFUnit::extractImpl(debug_info, offset_ptr))
    return false;
  TypeHash = debug_info.getU64(offset_ptr);
  TypeOffset = debug_info.getU32(offset_ptr);
  // TypeOffset is relative to the beginning of the header,
  // so we have to account for the leading length field.
  // FIXME: The size of the length field is 12 in DWARF64.
  unsigned SizeOfLength = 4;
  return TypeOffset < getLength() + SizeOfLength;
}
示例#8
0
文件: DWARFUnit.cpp 项目: MatzeB/llvm
// Look for a DWARF32-formatted contribution to the string offsets table
// starting at a given offset and record it in a descriptor.
static Optional<StrOffsetsContributionDescriptor>
parseDWARF32StringOffsetsTableHeader(DWARFDataExtractor &DA, uint32_t Offset) {
  if (!DA.isValidOffsetForDataOfSize(Offset, 8))
    return None;
  uint32_t ContributionSize = DA.getU32(&Offset);
  if (ContributionSize >= 0xfffffff0)
    return None;
  uint8_t Version = DA.getU16(&Offset);
  (void)DA.getU16(&Offset); // padding
  // The encoded length includes the 2-byte version field and the 2-byte
  // padding, so we need to subtract them out when we populate the descriptor.
  return {{Offset, ContributionSize - 4, Version, DWARF32}};
}
示例#9
0
void DWARFDebugLoc::parse(const DWARFDataExtractor &data) {
  IsLittleEndian = data.isLittleEndian();
  AddressSize = data.getAddressSize();

  uint32_t Offset = 0;
  while (data.isValidOffset(Offset + data.getAddressSize() - 1)) {
    if (auto LL = parseOneLocationList(data, &Offset))
      Locations.push_back(std::move(*LL));
    else
      break;
  }
  if (data.isValidOffset(Offset))
    errs() << "error: failed to consume entire .debug_loc section\n";
}
示例#10
0
void DWARFDebugMacroHeader::SkipOperandTable(
    const DWARFDataExtractor &debug_macro_data, lldb::offset_t *offset) {
  uint8_t entry_count = debug_macro_data.GetU8(offset);
  for (uint8_t i = 0; i < entry_count; i++) {
    // Skip over the opcode number.
    debug_macro_data.GetU8(offset);

    uint64_t operand_count = debug_macro_data.GetULEB128(offset);

    for (uint64_t j = 0; j < operand_count; j++) {
      // Skip over the operand form
      debug_macro_data.GetU8(offset);
    }
  }
}
示例#11
0
// Look for a DWARF64-formatted contribution to the string offsets table
// starting at a given offset and record it in a descriptor.
static Optional<StrOffsetsContributionDescriptor>
parseDWARF64StringOffsetsTableHeader(DWARFDataExtractor &DA, uint32_t Offset) {
  if (!DA.isValidOffsetForDataOfSize(Offset, 16))
    return Optional<StrOffsetsContributionDescriptor>();

  if (DA.getU32(&Offset) != 0xffffffff)
    return Optional<StrOffsetsContributionDescriptor>();

  uint64_t Size = DA.getU64(&Offset);
  uint8_t Version = DA.getU16(&Offset);
  (void)DA.getU16(&Offset); // padding
  // The encoded length includes the 2-byte version field and the 2-byte
  // padding, so we need to subtract them out when we populate the descriptor.
  return StrOffsetsContributionDescriptor(Offset, Size - 4, Version, DWARF64);
  //return Optional<StrOffsetsContributionDescriptor>(Descriptor);
}
示例#12
0
bool
DWARFCompileUnit::Extract(const DWARFDataExtractor &debug_info, lldb::offset_t *offset_ptr)
{
    Clear();

    m_offset = *offset_ptr;

    if (debug_info.ValidOffset(*offset_ptr))
    {
        dw_offset_t abbr_offset;
        const DWARFDebugAbbrev *abbr = m_dwarf2Data->DebugAbbrev();
        m_length        = debug_info.GetDWARFInitialLength(offset_ptr);
        m_is_dwarf64    = debug_info.IsDWARF64();
        m_version       = debug_info.GetU16(offset_ptr);
        abbr_offset     = debug_info.GetDWARFOffset(offset_ptr);
        m_addr_size     = debug_info.GetU8 (offset_ptr);

        bool length_OK = debug_info.ValidOffset(GetNextCompileUnitOffset()-1);
        bool version_OK = SymbolFileDWARF::SupportedVersion(m_version);
        bool abbr_offset_OK = m_dwarf2Data->get_debug_abbrev_data().ValidOffset(abbr_offset);
        bool addr_size_OK = ((m_addr_size == 4) || (m_addr_size == 8));

        if (length_OK && version_OK && addr_size_OK && abbr_offset_OK && abbr != NULL)
        {
            m_abbrevs = abbr->GetAbbreviationDeclarationSet(abbr_offset);
            return true;
        }

        // reset the offset to where we tried to parse from if anything went wrong
        *offset_ptr = m_offset;
    }

    return false;
}
示例#13
0
// Parse v5 directory/file entry content descriptions.
// Returns the descriptors, or an empty vector if we did not find a path or
// ran off the end of the prologue.
static ContentDescriptors
parseV5EntryFormat(const DWARFDataExtractor &DebugLineData, uint32_t *OffsetPtr,
                   uint64_t EndPrologueOffset, bool *HasMD5) {
  ContentDescriptors Descriptors;
  int FormatCount = DebugLineData.getU8(OffsetPtr);
  bool HasPath = false;
  for (int I = 0; I != FormatCount; ++I) {
    if (*OffsetPtr >= EndPrologueOffset)
      return ContentDescriptors();
    ContentDescriptor Descriptor;
    Descriptor.Type =
      dwarf::LineNumberEntryFormat(DebugLineData.getULEB128(OffsetPtr));
    Descriptor.Form = dwarf::Form(DebugLineData.getULEB128(OffsetPtr));
    if (Descriptor.Type == dwarf::DW_LNCT_path)
      HasPath = true;
    else if (Descriptor.Type == dwarf::DW_LNCT_MD5 && HasMD5)
      *HasMD5 = true;
    Descriptors.push_back(Descriptor);
  }
  return HasPath ? Descriptors : ContentDescriptors();
}
示例#14
0
Optional<StrOffsetsContributionDescriptor>
StrOffsetsContributionDescriptor::validateContributionSize(
    DWARFDataExtractor &DA) {
  uint8_t EntrySize = getDwarfOffsetByteSize();
  // In order to ensure that we don't read a partial record at the end of
  // the section we validate for a multiple of the entry size.
  uint64_t ValidationSize = alignTo(Size, EntrySize);
  // Guard against overflow.
  if (ValidationSize >= Size)
    if (DA.isValidOffsetForDataOfSize((uint32_t)Base, ValidationSize))
      return *this;
  return Optional<StrOffsetsContributionDescriptor>();
}
示例#15
0
//----------------------------------------------------------------------
// DWARFDebugAbbrev::Parse()
//----------------------------------------------------------------------
void DWARFDebugAbbrev::Parse(const DWARFDataExtractor &data) {
  lldb::offset_t offset = 0;

  while (data.ValidOffset(offset)) {
    uint32_t initial_cu_offset = offset;
    DWARFAbbreviationDeclarationSet abbrevDeclSet;

    if (abbrevDeclSet.Extract(data, &offset))
      m_abbrevCollMap[initial_cu_offset] = abbrevDeclSet;
    else
      break;
  }
  m_prev_abbr_offset_pos = m_abbrevCollMap.end();
}
示例#16
0
// Parse v2-v4 directory and file tables.
static void
parseV2DirFileTables(const DWARFDataExtractor &DebugLineData,
                     uint32_t *OffsetPtr, uint64_t EndPrologueOffset,
                     std::vector<StringRef> &IncludeDirectories,
                     std::vector<DWARFDebugLine::FileNameEntry> &FileNames) {
  while (*OffsetPtr < EndPrologueOffset) {
    StringRef S = DebugLineData.getCStrRef(OffsetPtr);
    if (S.empty())
      break;
    IncludeDirectories.push_back(S);
  }

  while (*OffsetPtr < EndPrologueOffset) {
    StringRef Name = DebugLineData.getCStrRef(OffsetPtr);
    if (Name.empty())
      break;
    DWARFDebugLine::FileNameEntry FileEntry;
    FileEntry.Name = Name;
    FileEntry.DirIdx = DebugLineData.getULEB128(OffsetPtr);
    FileEntry.ModTime = DebugLineData.getULEB128(OffsetPtr);
    FileEntry.Length = DebugLineData.getULEB128(OffsetPtr);
    FileNames.push_back(FileEntry);
  }
}
示例#17
0
DWARFDebugMacroHeader
DWARFDebugMacroHeader::ParseHeader(const DWARFDataExtractor &debug_macro_data,
                                   lldb::offset_t *offset) {
  DWARFDebugMacroHeader header;

  // Skip over the version field in header.
  header.m_version = debug_macro_data.GetU16(offset);

  uint8_t flags = debug_macro_data.GetU8(offset);
  header.m_offset_is_64_bit = flags & OFFSET_SIZE_MASK ? true : false;

  if (flags & DEBUG_LINE_OFFSET_MASK) {
    if (header.m_offset_is_64_bit)
      header.m_debug_line_offset = debug_macro_data.GetU64(offset);
    else
      header.m_debug_line_offset = debug_macro_data.GetU32(offset);
  }

  // Skip over the operands table if it is present.
  if (flags & OPCODE_OPERANDS_TABLE_MASK)
    SkipOperandTable(debug_macro_data, offset);

  return header;
}
示例#18
0
void DWARFDebugMacinfo::Dump(Stream *s, const DWARFDataExtractor &macinfo_data,
                             lldb::offset_t offset) {
  DWARFDebugMacinfoEntry maninfo_entry;
  if (macinfo_data.GetByteSize() == 0) {
    s->PutCString("< EMPTY >\n");
    return;
  }
  if (offset == LLDB_INVALID_OFFSET) {
    offset = 0;
    while (maninfo_entry.Extract(macinfo_data, &offset))
      maninfo_entry.Dump(s);
  } else {
    if (maninfo_entry.Extract(macinfo_data, &offset))
      maninfo_entry.Dump(s);
  }
}
示例#19
0
Optional<DWARFDebugLoc::LocationList>
DWARFDebugLoc::parseOneLocationList(DWARFDataExtractor Data, unsigned *Offset) {
  LocationList LL;
  LL.Offset = *Offset;

  // 2.6.2 Location Lists
  // A location list entry consists of:
  while (true) {
    Entry E;
    if (!Data.isValidOffsetForDataOfSize(*Offset, 2 * Data.getAddressSize())) {
      llvm::errs() << "Location list overflows the debug_loc section.\n";
      return None;
    }

    // 1. A beginning address offset. ...
    E.Begin = Data.getRelocatedAddress(Offset);

    // 2. An ending address offset. ...
    E.End = Data.getRelocatedAddress(Offset);

    // The end of any given location list is marked by an end of list entry,
    // which consists of a 0 for the beginning address offset and a 0 for the
    // ending address offset.
    if (E.Begin == 0 && E.End == 0)
      return LL;

    if (!Data.isValidOffsetForDataOfSize(*Offset, 2)) {
      llvm::errs() << "Location list overflows the debug_loc section.\n";
      return None;
    }

    unsigned Bytes = Data.getU16(Offset);
    if (!Data.isValidOffsetForDataOfSize(*Offset, Bytes)) {
      llvm::errs() << "Location list overflows the debug_loc section.\n";
      return None;
    }
    // A single location description describing the location of the object...
    StringRef str = Data.getData().substr(*Offset, Bytes);
    *Offset += Bytes;
    E.Loc.reserve(str.size());
    std::copy(str.begin(), str.end(), std::back_inserter(E.Loc));
    LL.Entries.push_back(std::move(E));
  }
}
示例#20
0
Expected<const DWARFDebugLine::LineTable *> DWARFDebugLine::getOrParseLineTable(
    DWARFDataExtractor &DebugLineData, uint32_t Offset, const DWARFContext &Ctx,
    const DWARFUnit *U, std::function<void(Error)> RecoverableErrorCallback) {
  if (!DebugLineData.isValidOffset(Offset))
    return createStringError(errc::invalid_argument, "offset 0x%8.8" PRIx32
                       " is not a valid debug line section offset",
                       Offset);

  std::pair<LineTableIter, bool> Pos =
      LineTableMap.insert(LineTableMapTy::value_type(Offset, LineTable()));
  LineTable *LT = &Pos.first->second;
  if (Pos.second) {
    if (Error Err =
            LT->parse(DebugLineData, &Offset, Ctx, U, RecoverableErrorCallback))
      return std::move(Err);
    return LT;
  }
  return LT;
}
示例#21
0
//----------------------------------------------------------------------
// Extract
//----------------------------------------------------------------------
bool DWARFDebugAranges::Extract(const DWARFDataExtractor &debug_aranges_data) {
  if (debug_aranges_data.ValidOffset(0)) {
    lldb::offset_t offset = 0;

    DWARFDebugArangeSet set;
    Range range;
    while (set.Extract(debug_aranges_data, &offset)) {
      const uint32_t num_descriptors = set.NumDescriptors();
      if (num_descriptors > 0) {
        const dw_offset_t cu_offset = set.GetCompileUnitDIEOffset();

        for (uint32_t i = 0; i < num_descriptors; ++i) {
          const DWARFDebugArangeSet::Descriptor &descriptor =
              set.GetDescriptorRef(i);
          m_aranges.Append(RangeToDIE::Entry(descriptor.address,
                                             descriptor.length, cu_offset));
        }
      }
      set.Clear();
    }
  }
  return false;
}
示例#22
0
bool
DWARFFormValue::ExtractValue(const DWARFDataExtractor& data, lldb::offset_t* offset_ptr, const DWARFCompileUnit* cu)
{
    bool indirect = false;
    bool is_block = false;
    m_value.data = NULL;
    uint8_t ref_addr_size;
    // Read the value for the form into value and follow and DW_FORM_indirect instances we run into
    do
    {
        indirect = false;
        switch (m_form)
        {
        case DW_FORM_addr:      m_value.value.uval = data.GetMaxU64(offset_ptr, DWARFCompileUnit::GetAddressByteSize(cu));  break;
        case DW_FORM_block2:    m_value.value.uval = data.GetU16(offset_ptr); is_block = true;          break;
        case DW_FORM_block4:    m_value.value.uval = data.GetU32(offset_ptr); is_block = true;          break;
        case DW_FORM_data2:     m_value.value.uval = data.GetU16(offset_ptr);                           break;
        case DW_FORM_data4:     m_value.value.uval = data.GetU32(offset_ptr);                           break;
        case DW_FORM_data8:     m_value.value.uval = data.GetU64(offset_ptr);                           break;
        case DW_FORM_string:    m_value.value.cstr = data.GetCStr(offset_ptr);
                                // Set the string value to also be the data for inlined cstr form values only
                                // so we can tell the difference between DW_FORM_string and DW_FORM_strp form
                                // values;
                                m_value.data = (uint8_t*)m_value.value.cstr;                            break;
        case DW_FORM_exprloc:
        case DW_FORM_block:     m_value.value.uval = data.GetULEB128(offset_ptr); is_block = true;      break;
        case DW_FORM_block1:    m_value.value.uval = data.GetU8(offset_ptr); is_block = true;           break;
        case DW_FORM_data1:     m_value.value.uval = data.GetU8(offset_ptr);                            break;
        case DW_FORM_flag:      m_value.value.uval = data.GetU8(offset_ptr);                            break;
        case DW_FORM_sdata:     m_value.value.sval = data.GetSLEB128(offset_ptr);                       break;
        case DW_FORM_strp:      m_value.value.uval = data.GetMaxU64(offset_ptr, DWARFCompileUnit::IsDWARF64(cu) ? 8 : 4);  break;
    //  case DW_FORM_APPLE_db_str:
        case DW_FORM_udata:     m_value.value.uval = data.GetULEB128(offset_ptr);                       break;
        case DW_FORM_ref_addr:  ref_addr_size = 4;
                                if (cu) {
                                    if (cu->GetVersion() <= 2)
                                        ref_addr_size = cu->GetAddressByteSize();
                                    else
                                        ref_addr_size = cu->IsDWARF64() ? 8 : 4;
                                }
                                m_value.value.uval = data.GetMaxU64(offset_ptr, ref_addr_size);         break;
        case DW_FORM_ref1:      m_value.value.uval = data.GetU8(offset_ptr);                            break;
        case DW_FORM_ref2:      m_value.value.uval = data.GetU16(offset_ptr);                           break;
        case DW_FORM_ref4:      m_value.value.uval = data.GetU32(offset_ptr);                           break;
        case DW_FORM_ref8:      m_value.value.uval = data.GetU64(offset_ptr);                           break;
        case DW_FORM_ref_udata: m_value.value.uval = data.GetULEB128(offset_ptr);                       break;
        case DW_FORM_indirect:
            m_form = data.GetULEB128(offset_ptr);
            indirect = true;
            break;

        case DW_FORM_sec_offset:    m_value.value.uval = data.GetMaxU64(offset_ptr, DWARFCompileUnit::IsDWARF64(cu) ? 8 : 4);  break;
        case DW_FORM_flag_present:  m_value.value.uval = 1;                                             break;
        case DW_FORM_ref_sig8:      m_value.value.uval = data.GetU64(offset_ptr);                       break;
        default:
            return false;
            break;
        }
    } while (indirect);

    if (is_block)
    {
        m_value.data = data.PeekData(*offset_ptr, m_value.value.uval);
        if (m_value.data != NULL)
        {
            *offset_ptr += m_value.value.uval;
        }
    }

    return true;
}
示例#23
0
bool DWARFDebugLine::Prologue::parse(const DWARFDataExtractor &DebugLineData,
                                     uint32_t *OffsetPtr, const DWARFUnit *U) {
  const uint64_t PrologueOffset = *OffsetPtr;

  clear();
  TotalLength = DebugLineData.getU32(OffsetPtr);
  if (TotalLength == UINT32_MAX) {
    FormParams.Format = dwarf::DWARF64;
    TotalLength = DebugLineData.getU64(OffsetPtr);
  } else if (TotalLength >= 0xffffff00) {
    return false;
  }
  FormParams.Version = DebugLineData.getU16(OffsetPtr);
  if (getVersion() < 2)
    return false;

  if (getVersion() >= 5) {
    FormParams.AddrSize = DebugLineData.getU8(OffsetPtr);
    assert((DebugLineData.getAddressSize() == 0 ||
            DebugLineData.getAddressSize() == getAddressSize()) &&
           "Line table header and data extractor disagree");
    SegSelectorSize = DebugLineData.getU8(OffsetPtr);
  }

  PrologueLength = DebugLineData.getUnsigned(OffsetPtr, sizeofPrologueLength());
  const uint64_t EndPrologueOffset = PrologueLength + *OffsetPtr;
  MinInstLength = DebugLineData.getU8(OffsetPtr);
  if (getVersion() >= 4)
    MaxOpsPerInst = DebugLineData.getU8(OffsetPtr);
  DefaultIsStmt = DebugLineData.getU8(OffsetPtr);
  LineBase = DebugLineData.getU8(OffsetPtr);
  LineRange = DebugLineData.getU8(OffsetPtr);
  OpcodeBase = DebugLineData.getU8(OffsetPtr);

  StandardOpcodeLengths.reserve(OpcodeBase - 1);
  for (uint32_t I = 1; I < OpcodeBase; ++I) {
    uint8_t OpLen = DebugLineData.getU8(OffsetPtr);
    StandardOpcodeLengths.push_back(OpLen);
  }

  if (getVersion() >= 5) {
    if (!parseV5DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
                              FormParams, U, HasMD5, IncludeDirectories,
                              FileNames)) {
      fprintf(stderr,
              "warning: parsing line table prologue at 0x%8.8" PRIx64
              " found an invalid directory or file table description at"
              " 0x%8.8" PRIx64 "\n", PrologueOffset, (uint64_t)*OffsetPtr);
      return false;
    }
  } else
    parseV2DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
                         IncludeDirectories, FileNames);

  if (*OffsetPtr != EndPrologueOffset) {
    fprintf(stderr,
            "warning: parsing line table prologue at 0x%8.8" PRIx64
            " should have ended at 0x%8.8" PRIx64
            " but it ended at 0x%8.8" PRIx64 "\n",
            PrologueOffset, EndPrologueOffset, (uint64_t)*OffsetPtr);
    return false;
  }
  return true;
}
示例#24
0
bool DWARFVerifier::verifyUnitHeader(const DWARFDataExtractor DebugInfoData,
                                     uint32_t *Offset, unsigned UnitIndex,
                                     uint8_t &UnitType, bool &isUnitDWARF64) {
  uint32_t AbbrOffset, Length;
  uint8_t AddrSize = 0;
  uint16_t Version;
  bool Success = true;

  bool ValidLength = false;
  bool ValidVersion = false;
  bool ValidAddrSize = false;
  bool ValidType = true;
  bool ValidAbbrevOffset = true;

  uint32_t OffsetStart = *Offset;
  Length = DebugInfoData.getU32(Offset);
  if (Length == UINT32_MAX) {
    isUnitDWARF64 = true;
    OS << format(
        "Unit[%d] is in 64-bit DWARF format; cannot verify from this point.\n",
        UnitIndex);
    return false;
  }
  Version = DebugInfoData.getU16(Offset);

  if (Version >= 5) {
    UnitType = DebugInfoData.getU8(Offset);
    AddrSize = DebugInfoData.getU8(Offset);
    AbbrOffset = DebugInfoData.getU32(Offset);
    ValidType = dwarf::isUnitType(UnitType);
  } else {
    UnitType = 0;
    AbbrOffset = DebugInfoData.getU32(Offset);
    AddrSize = DebugInfoData.getU8(Offset);
  }

  if (!DCtx.getDebugAbbrev()->getAbbreviationDeclarationSet(AbbrOffset))
    ValidAbbrevOffset = false;

  ValidLength = DebugInfoData.isValidOffset(OffsetStart + Length + 3);
  ValidVersion = DWARFContext::isSupportedVersion(Version);
  ValidAddrSize = AddrSize == 4 || AddrSize == 8;
  if (!ValidLength || !ValidVersion || !ValidAddrSize || !ValidAbbrevOffset ||
      !ValidType) {
    Success = false;
    error() << format("Units[%d] - start offset: 0x%08x \n", UnitIndex,
                      OffsetStart);
    if (!ValidLength)
      note() << "The length for this unit is too "
            "large for the .debug_info provided.\n";
    if (!ValidVersion)
      note() << "The 16 bit unit header version is not valid.\n";
    if (!ValidType)
      note() << "The unit type encoding is not valid.\n";
    if (!ValidAbbrevOffset)
      note() << "The offset into the .debug_abbrev section is "
            "not valid.\n";
    if (!ValidAddrSize)
      note() << "The address size is unsupported.\n";
  }
  *Offset = OffsetStart + Length + 4;
  return Success;
}
示例#25
0
bool DWARFDebugLine::LineTable::parse(DWARFDataExtractor &DebugLineData,
                                      uint32_t *OffsetPtr, const DWARFUnit *U,
                                      raw_ostream *OS) {
  const uint32_t DebugLineOffset = *OffsetPtr;

  clear();

  if (!Prologue.parse(DebugLineData, OffsetPtr, U)) {
    // Restore our offset and return false to indicate failure!
    *OffsetPtr = DebugLineOffset;
    return false;
  }

  if (OS)
    Prologue.dump(*OS);

  const uint32_t EndOffset =
      DebugLineOffset + Prologue.TotalLength + Prologue.sizeofTotalLength();

  // See if we should tell the data extractor the address size.
  if (DebugLineData.getAddressSize() == 0)
    DebugLineData.setAddressSize(Prologue.getAddressSize());
  else
    assert(Prologue.getAddressSize() == 0 ||
           Prologue.getAddressSize() == DebugLineData.getAddressSize());

  ParsingState State(this);

  while (*OffsetPtr < EndOffset) {
    if (OS)
      *OS << format("0x%08.08" PRIx32 ": ", *OffsetPtr);

    uint8_t Opcode = DebugLineData.getU8(OffsetPtr);

    if (OS)
      *OS << format("%02.02" PRIx8 " ", Opcode);

    if (Opcode == 0) {
      // Extended Opcodes always start with a zero opcode followed by
      // a uleb128 length so you can skip ones you don't know about
      uint64_t Len = DebugLineData.getULEB128(OffsetPtr);
      uint32_t ExtOffset = *OffsetPtr;

      // Tolerate zero-length; assume length is correct and soldier on.
      if (Len == 0) {
        if (OS)
          *OS << "Badly formed extended line op (length 0)\n";
        continue;
      }

      uint8_t SubOpcode = DebugLineData.getU8(OffsetPtr);
      if (OS)
        *OS << LNExtendedString(SubOpcode);
      switch (SubOpcode) {
      case DW_LNE_end_sequence:
        // Set the end_sequence register of the state machine to true and
        // append a row to the matrix using the current values of the
        // state-machine registers. Then reset the registers to the initial
        // values specified above. Every statement program sequence must end
        // with a DW_LNE_end_sequence instruction which creates a row whose
        // address is that of the byte after the last target machine instruction
        // of the sequence.
        State.Row.EndSequence = true;
        State.appendRowToMatrix(*OffsetPtr);
        if (OS) {
          *OS << "\n";
          OS->indent(12);
          State.Row.dump(*OS);
        }
        State.resetRowAndSequence();
        break;

      case DW_LNE_set_address:
        // Takes a single relocatable address as an operand. The size of the
        // operand is the size appropriate to hold an address on the target
        // machine. Set the address register to the value given by the
        // relocatable address. All of the other statement program opcodes
        // that affect the address register add a delta to it. This instruction
        // stores a relocatable value into it instead.
        //
        // Make sure the extractor knows the address size.  If not, infer it
        // from the size of the operand.
        if (DebugLineData.getAddressSize() == 0)
          DebugLineData.setAddressSize(Len - 1);
        else
          assert(DebugLineData.getAddressSize() == Len - 1);
        State.Row.Address = DebugLineData.getRelocatedAddress(OffsetPtr);
        if (OS)
          *OS << format(" (0x%16.16" PRIx64 ")", State.Row.Address);
        break;

      case DW_LNE_define_file:
        // Takes 4 arguments. The first is a null terminated string containing
        // a source file name. The second is an unsigned LEB128 number
        // representing the directory index of the directory in which the file
        // was found. The third is an unsigned LEB128 number representing the
        // time of last modification of the file. The fourth is an unsigned
        // LEB128 number representing the length in bytes of the file. The time
        // and length fields may contain LEB128(0) if the information is not
        // available.
        //
        // The directory index represents an entry in the include_directories
        // section of the statement program prologue. The index is LEB128(0)
        // if the file was found in the current directory of the compilation,
        // LEB128(1) if it was found in the first directory in the
        // include_directories section, and so on. The directory index is
        // ignored for file names that represent full path names.
        //
        // The files are numbered, starting at 1, in the order in which they
        // appear; the names in the prologue come before names defined by
        // the DW_LNE_define_file instruction. These numbers are used in the
        // the file register of the state machine.
        {
          FileNameEntry FileEntry;
          FileEntry.Name = DebugLineData.getCStr(OffsetPtr);
          FileEntry.DirIdx = DebugLineData.getULEB128(OffsetPtr);
          FileEntry.ModTime = DebugLineData.getULEB128(OffsetPtr);
          FileEntry.Length = DebugLineData.getULEB128(OffsetPtr);
          Prologue.FileNames.push_back(FileEntry);
          if (OS)
            *OS << " (" << FileEntry.Name.str()
                << ", dir=" << FileEntry.DirIdx << ", mod_time="
                << format("(0x%16.16" PRIx64 ")", FileEntry.ModTime)
                << ", length=" << FileEntry.Length << ")";
        }
        break;

      case DW_LNE_set_discriminator:
        State.Row.Discriminator = DebugLineData.getULEB128(OffsetPtr);
        if (OS)
          *OS << " (" << State.Row.Discriminator << ")";
        break;

      default:
        if (OS)
          *OS << format("Unrecognized extended op 0x%02.02" PRIx8, SubOpcode)
              << format(" length %" PRIx64, Len);
        // Len doesn't include the zero opcode byte or the length itself, but
        // it does include the sub_opcode, so we have to adjust for that.
        (*OffsetPtr) += Len - 1;
        break;
      }
      // Make sure the stated and parsed lengths are the same.
      // Otherwise we have an unparseable line-number program.
      if (*OffsetPtr - ExtOffset != Len) {
        fprintf(stderr, "Unexpected line op length at offset 0x%8.8" PRIx32
                " expected 0x%2.2" PRIx64 " found 0x%2.2" PRIx32 "\n",
                ExtOffset, Len, *OffsetPtr - ExtOffset);
        // Skip the rest of the line-number program.
        *OffsetPtr = EndOffset;
        return false;
      }
    } else if (Opcode < Prologue.OpcodeBase) {
      if (OS)
        *OS << LNStandardString(Opcode);
      switch (Opcode) {
      // Standard Opcodes
      case DW_LNS_copy:
        // Takes no arguments. Append a row to the matrix using the
        // current values of the state-machine registers. Then set
        // the basic_block register to false.
        State.appendRowToMatrix(*OffsetPtr);
        if (OS) {
          *OS << "\n";
          OS->indent(12);
          State.Row.dump(*OS);
          *OS << "\n";
        }
        break;

      case DW_LNS_advance_pc:
        // Takes a single unsigned LEB128 operand, multiplies it by the
        // min_inst_length field of the prologue, and adds the
        // result to the address register of the state machine.
        {
          uint64_t AddrOffset =
              DebugLineData.getULEB128(OffsetPtr) * Prologue.MinInstLength;
          State.Row.Address += AddrOffset;
          if (OS)
            *OS << " (" << AddrOffset << ")";
        }
        break;

      case DW_LNS_advance_line:
        // Takes a single signed LEB128 operand and adds that value to
        // the line register of the state machine.
        State.Row.Line += DebugLineData.getSLEB128(OffsetPtr);
        if (OS)
          *OS << " (" << State.Row.Line << ")";
        break;

      case DW_LNS_set_file:
        // Takes a single unsigned LEB128 operand and stores it in the file
        // register of the state machine.
        State.Row.File = DebugLineData.getULEB128(OffsetPtr);
        if (OS)
          *OS << " (" << State.Row.File << ")";
        break;

      case DW_LNS_set_column:
        // Takes a single unsigned LEB128 operand and stores it in the
        // column register of the state machine.
        State.Row.Column = DebugLineData.getULEB128(OffsetPtr);
        if (OS)
          *OS << " (" << State.Row.Column << ")";
        break;

      case DW_LNS_negate_stmt:
        // Takes no arguments. Set the is_stmt register of the state
        // machine to the logical negation of its current value.
        State.Row.IsStmt = !State.Row.IsStmt;
        break;

      case DW_LNS_set_basic_block:
        // Takes no arguments. Set the basic_block register of the
        // state machine to true
        State.Row.BasicBlock = true;
        break;

      case DW_LNS_const_add_pc:
        // Takes no arguments. Add to the address register of the state
        // machine the address increment value corresponding to special
        // opcode 255. The motivation for DW_LNS_const_add_pc is this:
        // when the statement program needs to advance the address by a
        // small amount, it can use a single special opcode, which occupies
        // a single byte. When it needs to advance the address by up to
        // twice the range of the last special opcode, it can use
        // DW_LNS_const_add_pc followed by a special opcode, for a total
        // of two bytes. Only if it needs to advance the address by more
        // than twice that range will it need to use both DW_LNS_advance_pc
        // and a special opcode, requiring three or more bytes.
        {
          uint8_t AdjustOpcode = 255 - Prologue.OpcodeBase;
          uint64_t AddrOffset =
              (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
          State.Row.Address += AddrOffset;
          if (OS)
            *OS
                << format(" (0x%16.16" PRIx64 ")", AddrOffset);
        }
        break;

      case DW_LNS_fixed_advance_pc:
        // Takes a single uhalf operand. Add to the address register of
        // the state machine the value of the (unencoded) operand. This
        // is the only extended opcode that takes an argument that is not
        // a variable length number. The motivation for DW_LNS_fixed_advance_pc
        // is this: existing assemblers cannot emit DW_LNS_advance_pc or
        // special opcodes because they cannot encode LEB128 numbers or
        // judge when the computation of a special opcode overflows and
        // requires the use of DW_LNS_advance_pc. Such assemblers, however,
        // can use DW_LNS_fixed_advance_pc instead, sacrificing compression.
        {
          uint16_t PCOffset = DebugLineData.getU16(OffsetPtr);
          State.Row.Address += PCOffset;
          if (OS)
            *OS
                << format(" (0x%16.16" PRIx64 ")", PCOffset);
        }
        break;

      case DW_LNS_set_prologue_end:
        // Takes no arguments. Set the prologue_end register of the
        // state machine to true
        State.Row.PrologueEnd = true;
        break;

      case DW_LNS_set_epilogue_begin:
        // Takes no arguments. Set the basic_block register of the
        // state machine to true
        State.Row.EpilogueBegin = true;
        break;

      case DW_LNS_set_isa:
        // Takes a single unsigned LEB128 operand and stores it in the
        // column register of the state machine.
        State.Row.Isa = DebugLineData.getULEB128(OffsetPtr);
        if (OS)
          *OS << " (" << State.Row.Isa << ")";
        break;

      default:
        // Handle any unknown standard opcodes here. We know the lengths
        // of such opcodes because they are specified in the prologue
        // as a multiple of LEB128 operands for each opcode.
        {
          assert(Opcode - 1U < Prologue.StandardOpcodeLengths.size());
          uint8_t OpcodeLength = Prologue.StandardOpcodeLengths[Opcode - 1];
          for (uint8_t I = 0; I < OpcodeLength; ++I) {
            uint64_t Value = DebugLineData.getULEB128(OffsetPtr);
            if (OS)
              *OS << format("Skipping ULEB128 value: 0x%16.16" PRIx64 ")\n",
                            Value);
          }
        }
        break;
      }
    } else {
      // Special Opcodes

      // A special opcode value is chosen based on the amount that needs
      // to be added to the line and address registers. The maximum line
      // increment for a special opcode is the value of the line_base
      // field in the header, plus the value of the line_range field,
      // minus 1 (line base + line range - 1). If the desired line
      // increment is greater than the maximum line increment, a standard
      // opcode must be used instead of a special opcode. The "address
      // advance" is calculated by dividing the desired address increment
      // by the minimum_instruction_length field from the header. The
      // special opcode is then calculated using the following formula:
      //
      //  opcode = (desired line increment - line_base) +
      //           (line_range * address advance) + opcode_base
      //
      // If the resulting opcode is greater than 255, a standard opcode
      // must be used instead.
      //
      // To decode a special opcode, subtract the opcode_base from the
      // opcode itself to give the adjusted opcode. The amount to
      // increment the address register is the result of the adjusted
      // opcode divided by the line_range multiplied by the
      // minimum_instruction_length field from the header. That is:
      //
      //  address increment = (adjusted opcode / line_range) *
      //                      minimum_instruction_length
      //
      // The amount to increment the line register is the line_base plus
      // the result of the adjusted opcode modulo the line_range. That is:
      //
      // line increment = line_base + (adjusted opcode % line_range)

      uint8_t AdjustOpcode = Opcode - Prologue.OpcodeBase;
      uint64_t AddrOffset =
          (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
      int32_t LineOffset =
          Prologue.LineBase + (AdjustOpcode % Prologue.LineRange);
      State.Row.Line += LineOffset;
      State.Row.Address += AddrOffset;

      if (OS) {
        *OS << "address += " << ((uint32_t)AdjustOpcode)
            << ",  line += " << LineOffset << "\n";
        OS->indent(12);
        State.Row.dump(*OS);
      }

      State.appendRowToMatrix(*OffsetPtr);
      // Reset discriminator to 0.
      State.Row.Discriminator = 0;
    }
    if(OS)
      *OS << "\n";
  }

  if (!State.Sequence.Empty) {
    fprintf(stderr, "warning: last sequence in debug line table is not"
                    "terminated!\n");
  }

  // Sort all sequences so that address lookup will work faster.
  if (!Sequences.empty()) {
    std::sort(Sequences.begin(), Sequences.end(), Sequence::orderByLowPC);
    // Note: actually, instruction address ranges of sequences should not
    // overlap (in shared objects and executables). If they do, the address
    // lookup would still work, though, but result would be ambiguous.
    // We don't report warning in this case. For example,
    // sometimes .so compiled from multiple object files contains a few
    // rudimentary sequences for address ranges [0x0, 0xsomething).
  }

  return EndOffset;
}
示例#26
0
bool DWARFUnitHeader::extract(DWARFContext &Context,
                              const DWARFDataExtractor &debug_info,
                              uint32_t *offset_ptr,
                              DWARFSectionKind SectionKind,
                              const DWARFUnitIndex *Index) {
  Offset = *offset_ptr;
  IndexEntry = Index ? Index->getFromOffset(*offset_ptr) : nullptr;
  Length = debug_info.getU32(offset_ptr);
  // FIXME: Support DWARF64.
  unsigned SizeOfLength = 4;
  FormParams.Format = DWARF32;
  FormParams.Version = debug_info.getU16(offset_ptr);
  if (FormParams.Version >= 5) {
    UnitType = debug_info.getU8(offset_ptr);
    FormParams.AddrSize = debug_info.getU8(offset_ptr);
    AbbrOffset = debug_info.getU32(offset_ptr);
  } else {
    AbbrOffset = debug_info.getRelocatedValue(4, offset_ptr);
    FormParams.AddrSize = debug_info.getU8(offset_ptr);
    // Fake a unit type based on the section type.  This isn't perfect,
    // but distinguishing compile and type units is generally enough.
    if (SectionKind == DW_SECT_TYPES)
      UnitType = DW_UT_type;
    else
      UnitType = DW_UT_compile;
  }
  if (IndexEntry) {
    if (AbbrOffset)
      return false;
    auto *UnitContrib = IndexEntry->getOffset();
    if (!UnitContrib || UnitContrib->Length != (Length + 4))
      return false;
    auto *AbbrEntry = IndexEntry->getOffset(DW_SECT_ABBREV);
    if (!AbbrEntry)
      return false;
    AbbrOffset = AbbrEntry->Offset;
  }
  if (isTypeUnit()) {
    TypeHash = debug_info.getU64(offset_ptr);
    TypeOffset = debug_info.getU32(offset_ptr);
  } else if (UnitType == DW_UT_split_compile || UnitType == DW_UT_skeleton)
    DWOId = debug_info.getU64(offset_ptr);

  // Header fields all parsed, capture the size of this unit header.
  assert(*offset_ptr - Offset <= 255 && "unexpected header size");
  Size = uint8_t(*offset_ptr - Offset);

  // Type offset is unit-relative; should be after the header and before
  // the end of the current unit.
  bool TypeOffsetOK =
      !isTypeUnit()
          ? true
          : TypeOffset >= Size && TypeOffset < getLength() + SizeOfLength;
  bool LengthOK = debug_info.isValidOffset(getNextUnitOffset() - 1);
  bool VersionOK = DWARFContext::isSupportedVersion(getVersion());
  bool AddrSizeOK = getAddressByteSize() == 4 || getAddressByteSize() == 8;

  if (!LengthOK || !VersionOK || !AddrSizeOK || !TypeOffsetOK)
    return false;

  // Keep track of the highest DWARF version we encounter across all units.
  Context.setMaxVersionIfGreater(getVersion());
  return true;
}
示例#27
0
bool DWARFFormValue::extractValue(const DWARFDataExtractor &Data,
                                  uint32_t *OffsetPtr, DWARFFormParams FP,
                                  const DWARFUnit *CU) {
  U = CU;
  bool Indirect = false;
  bool IsBlock = false;
  Value.data = nullptr;
  // Read the value for the form into value and follow and DW_FORM_indirect
  // instances we run into
  do {
    Indirect = false;
    switch (Form) {
    case DW_FORM_addr:
    case DW_FORM_ref_addr: {
      uint16_t Size =
          (Form == DW_FORM_addr) ? FP.AddrSize : FP.getRefAddrByteSize();
      Value.uval = Data.getRelocatedValue(Size, OffsetPtr, &Value.SectionIndex);
      break;
    }
    case DW_FORM_exprloc:
    case DW_FORM_block:
      Value.uval = Data.getULEB128(OffsetPtr);
      IsBlock = true;
      break;
    case DW_FORM_block1:
      Value.uval = Data.getU8(OffsetPtr);
      IsBlock = true;
      break;
    case DW_FORM_block2:
      Value.uval = Data.getU16(OffsetPtr);
      IsBlock = true;
      break;
    case DW_FORM_block4:
      Value.uval = Data.getU32(OffsetPtr);
      IsBlock = true;
      break;
    case DW_FORM_data1:
    case DW_FORM_ref1:
    case DW_FORM_flag:
    case DW_FORM_strx1:
    case DW_FORM_addrx1:
      Value.uval = Data.getU8(OffsetPtr);
      break;
    case DW_FORM_data2:
    case DW_FORM_ref2:
    case DW_FORM_strx2:
    case DW_FORM_addrx2:
      Value.uval = Data.getU16(OffsetPtr);
      break;
    case DW_FORM_strx3:
      Value.uval = Data.getU24(OffsetPtr);
      break;
    case DW_FORM_data4:
    case DW_FORM_ref4:
    case DW_FORM_ref_sup4:
    case DW_FORM_strx4:
    case DW_FORM_addrx4:
      Value.uval = Data.getRelocatedValue(4, OffsetPtr);
      break;
    case DW_FORM_data8:
    case DW_FORM_ref8:
    case DW_FORM_ref_sup8:
      Value.uval = Data.getU64(OffsetPtr);
      break;
    case DW_FORM_data16:
      // Treat this like a 16-byte block.
      Value.uval = 16;
      IsBlock = true;
      break;
    case DW_FORM_sdata:
      Value.sval = Data.getSLEB128(OffsetPtr);
      break;
    case DW_FORM_udata:
    case DW_FORM_ref_udata:
      Value.uval = Data.getULEB128(OffsetPtr);
      break;
    case DW_FORM_string:
      Value.cstr = Data.getCStr(OffsetPtr);
      break;
    case DW_FORM_indirect:
      Form = static_cast<dwarf::Form>(Data.getULEB128(OffsetPtr));
      Indirect = true;
      break;
    case DW_FORM_strp:
    case DW_FORM_sec_offset:
    case DW_FORM_GNU_ref_alt:
    case DW_FORM_GNU_strp_alt:
    case DW_FORM_line_strp:
    case DW_FORM_strp_sup: {
      Value.uval =
          Data.getRelocatedValue(FP.getDwarfOffsetByteSize(), OffsetPtr);
      break;
    }
    case DW_FORM_flag_present:
      Value.uval = 1;
      break;
    case DW_FORM_ref_sig8:
      Value.uval = Data.getU64(OffsetPtr);
      break;
    case DW_FORM_GNU_addr_index:
    case DW_FORM_GNU_str_index:
    case DW_FORM_strx:
      Value.uval = Data.getULEB128(OffsetPtr);
      break;
    default:
      // DWARFFormValue::skipValue() will have caught this and caused all
      // DWARF DIEs to fail to be parsed, so this code is not be reachable.
      llvm_unreachable("unsupported form");
    }
  } while (Indirect);

  if (IsBlock) {
    StringRef Str = Data.getData().substr(*OffsetPtr, Value.uval);
    Value.data = nullptr;
    if (!Str.empty()) {
      Value.data = reinterpret_cast<const uint8_t *>(Str.data());
      *OffsetPtr += Value.uval;
    }
  }

  return true;
}
bool
DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor& data, lldb::offset_t* offset_ptr)
{
    return Extract(data, offset_ptr, data.GetULEB128(offset_ptr));
}
示例#29
0
llvm::Error DWARFDebugNames::Header::extract(const DWARFDataExtractor &AS,
                                             uint32_t *Offset) {
  // Check that we can read the fixed-size part.
  if (!AS.isValidOffset(*Offset + sizeof(HeaderPOD) - 1))
    return make_error<StringError>("Section too small: cannot read header.",
                                   inconvertibleErrorCode());

  UnitLength = AS.getU32(Offset);
  Version = AS.getU16(Offset);
  Padding = AS.getU16(Offset);
  CompUnitCount = AS.getU32(Offset);
  LocalTypeUnitCount = AS.getU32(Offset);
  ForeignTypeUnitCount = AS.getU32(Offset);
  BucketCount = AS.getU32(Offset);
  NameCount = AS.getU32(Offset);
  AbbrevTableSize = AS.getU32(Offset);
  AugmentationStringSize = AS.getU32(Offset);

  if (!AS.isValidOffsetForDataOfSize(*Offset, AugmentationStringSize))
    return make_error<StringError>(
        "Section too small: cannot read header augmentation.",
        inconvertibleErrorCode());
  AugmentationString.resize(AugmentationStringSize);
  AS.getU8(Offset, reinterpret_cast<uint8_t *>(AugmentationString.data()),
           AugmentationStringSize);
  *Offset = alignTo(*Offset, 4);
  return Error::success();
}
示例#30
0
bool
DWARFFormValue::SkipValue(dw_form_t form, const DWARFDataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu)
{
    uint8_t ref_addr_size;
    switch (form)
    {
    // Blocks if inlined data that have a length field and the data bytes
    // inlined in the .debug_info
    case DW_FORM_exprloc:
    case DW_FORM_block:  { dw_uleb128_t size = debug_info_data.GetULEB128(offset_ptr); *offset_ptr += size; } return true;
    case DW_FORM_block1: { dw_uleb128_t size = debug_info_data.GetU8(offset_ptr);      *offset_ptr += size; } return true;
    case DW_FORM_block2: { dw_uleb128_t size = debug_info_data.GetU16(offset_ptr);     *offset_ptr += size; } return true;
    case DW_FORM_block4: { dw_uleb128_t size = debug_info_data.GetU32(offset_ptr);     *offset_ptr += size; } return true;

    // Inlined NULL terminated C-strings
    case DW_FORM_string:
        debug_info_data.GetCStr(offset_ptr);
        return true;

    // Compile unit address sized values
    case DW_FORM_addr:
        *offset_ptr += DWARFCompileUnit::GetAddressByteSize(cu);
        return true;

    case DW_FORM_ref_addr:
        ref_addr_size = 4;
        if (cu) {
            if (cu->GetVersion() <= 2)
                ref_addr_size = cu->GetAddressByteSize();
            else
                ref_addr_size = cu->IsDWARF64() ? 8 : 4;
        }
        *offset_ptr += ref_addr_size;
        return true;

    // 0 bytes values (implied from DW_FORM)
    case DW_FORM_flag_present:
        return true;

    // 1 byte values
    case DW_FORM_data1:
    case DW_FORM_flag:
    case DW_FORM_ref1:
        *offset_ptr += 1;
        return true;

    // 2 byte values
    case DW_FORM_data2:
    case DW_FORM_ref2:
        *offset_ptr += 2;
        return true;

    // 32 bit for DWARF 32, 64 for DWARF 64
    case DW_FORM_sec_offset:
    case DW_FORM_strp:
        *offset_ptr += (cu->IsDWARF64() ? 8 : 4);
        return true;

    // 4 byte values
    case DW_FORM_data4:
    case DW_FORM_ref4:
        *offset_ptr += 4;
        return true;

    // 8 byte values
    case DW_FORM_data8:
    case DW_FORM_ref8:
    case DW_FORM_ref_sig8:
        *offset_ptr += 8;
        return true;

    // signed or unsigned LEB 128 values
    case DW_FORM_sdata:
    case DW_FORM_udata:
    case DW_FORM_ref_udata:
        debug_info_data.Skip_LEB128(offset_ptr);
        return true;

    case DW_FORM_indirect:
        {
            dw_form_t indirect_form = debug_info_data.GetULEB128(offset_ptr);
            return DWARFFormValue::SkipValue (indirect_form,
                                              debug_info_data,
                                              offset_ptr,
                                              cu);
        }

    default:
        break;
    }
    return false;
}