C++ DataExtractor::GetU16方法代码示例

void
SystemRuntimeMacOSX::ReadLibpthreadOffsets ()
{
    if (m_libpthread_offsets.IsValid())
        return;

    ReadLibpthreadOffsetsAddress ();

    if (m_libpthread_layout_offsets_addr != LLDB_INVALID_ADDRESS)
    {
        uint8_t memory_buffer[sizeof (struct LibpthreadOffsets)];
        DataExtractor data (memory_buffer,
                            sizeof(memory_buffer),
                            m_process->GetByteOrder(),
                            m_process->GetAddressByteSize());
        Error error;
        if (m_process->ReadMemory (m_libpthread_layout_offsets_addr, memory_buffer, sizeof(memory_buffer), error) == sizeof(memory_buffer))
        {
            lldb::offset_t data_offset = 0;

            // The struct LibpthreadOffsets is a series of uint16_t's - extract them all
            // in one big go.
            data.GetU16 (&data_offset, &m_libpthread_offsets.plo_version, sizeof (struct LibpthreadOffsets) / sizeof (uint16_t));
        }
    }
}

Error
ELFLinuxPrStatus::Parse(DataExtractor &data, ArchSpec &arch)
{
    Error error;
    ByteOrder byteorder = data.GetByteOrder();
    if (GetSize(arch) > data.GetByteSize())
    {
        error.SetErrorStringWithFormat("NT_PRSTATUS size should be %lu, but the remaining bytes are: %lu",
                                       GetSize(arch), data.GetByteSize());
        return error;
    }

    switch(arch.GetCore())
    {
        case ArchSpec::eCore_s390x_generic:
        case ArchSpec::eCore_x86_64_x86_64:
            data.ExtractBytes(0, sizeof(ELFLinuxPrStatus), byteorder, this);
            break;
        case ArchSpec::eCore_x86_32_i386:
        case ArchSpec::eCore_x86_32_i486:
        {
            // Parsing from a 32 bit ELF core file, and populating/reusing the structure
            // properly, because the struct is for the 64 bit version
            offset_t offset = 0;
            si_signo = data.GetU32(&offset);
            si_code = data.GetU32(&offset);
            si_errno = data.GetU32(&offset);

            pr_cursig = data.GetU16(&offset);
            offset += 2; // pad

            pr_sigpend = data.GetU32(&offset);
            pr_sighold = data.GetU32(&offset);

            pr_pid = data.GetU32(&offset);
            pr_ppid = data.GetU32(&offset);
            pr_pgrp = data.GetU32(&offset);
            pr_sid = data.GetU32(&offset);

            pr_utime.tv_sec = data.GetU32(&offset);
            pr_utime.tv_usec = data.GetU32(&offset);

            pr_stime.tv_sec = data.GetU32(&offset);
            pr_stime.tv_usec = data.GetU32(&offset);

            pr_cutime.tv_sec = data.GetU32(&offset);
            pr_cutime.tv_usec = data.GetU32(&offset);

            pr_cstime.tv_sec = data.GetU32(&offset);
            pr_cstime.tv_usec = data.GetU32(&offset);

            break;
        }
        default:
            error.SetErrorStringWithFormat("ELFLinuxPrStatus::%s Unknown architecture", __FUNCTION__);
            break;
    }

    return error;
}

bool
DWARFCompileUnit::Extract(const DataExtractor &debug_info, uint32_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.GetU32(offset_ptr);
        m_version       = debug_info.GetU16(offset_ptr);
        abbr_offset     = debug_info.GetU32(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;
}

//----------------------------------------------------------------------
// ParserCOFFHeader
//----------------------------------------------------------------------
bool ObjectFilePECOFF::ParseCOFFHeader(DataExtractor &data,
                                       lldb::offset_t *offset_ptr,
                                       coff_header_t &coff_header) {
  bool success =
      data.ValidOffsetForDataOfSize(*offset_ptr, sizeof(coff_header));
  if (success) {
    coff_header.machine = data.GetU16(offset_ptr);
    coff_header.nsects = data.GetU16(offset_ptr);
    coff_header.modtime = data.GetU32(offset_ptr);
    coff_header.symoff = data.GetU32(offset_ptr);
    coff_header.nsyms = data.GetU32(offset_ptr);
    coff_header.hdrsize = data.GetU16(offset_ptr);
    coff_header.flags = data.GetU16(offset_ptr);
  }
  if (!success)
    memset(&coff_header, 0, sizeof(coff_header));
  return success;
}

bool CommunicationKDP::CheckForPacket(const uint8_t *src, size_t src_len,
                                      DataExtractor &packet) {
  // Put the packet data into the buffer in a thread safe fashion
  std::lock_guard<std::recursive_mutex> guard(m_bytes_mutex);

  Log *log(ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_PACKETS));

  if (src && src_len > 0) {
    if (log && log->GetVerbose()) {
      PacketStreamType log_strm;
      DumpHexBytes(&log_strm, src, src_len, UINT32_MAX, LLDB_INVALID_ADDRESS);
      log->Printf("CommunicationKDP::%s adding %u bytes: %s", __FUNCTION__,
                  (uint32_t)src_len, log_strm.GetData());
    }
    m_bytes.append((const char *)src, src_len);
  }

  // Make sure we at least have enough bytes for a packet header
  const size_t bytes_available = m_bytes.size();
  if (bytes_available >= 8) {
    packet.SetData(&m_bytes[0], bytes_available, m_byte_order);
    lldb::offset_t offset = 0;
    uint8_t reply_command = packet.GetU8(&offset);
    switch (reply_command) {
    case ePacketTypeRequest | KDP_EXCEPTION:
    case ePacketTypeRequest | KDP_TERMINATION:
      // We got an exception request, so be sure to send an ACK
      {
        PacketStreamType request_ack_packet(Stream::eBinary, m_addr_byte_size,
                                            m_byte_order);
        // Set the reply but and make the ACK packet
        request_ack_packet.PutHex8(reply_command | ePacketTypeReply);
        request_ack_packet.PutHex8(packet.GetU8(&offset));
        request_ack_packet.PutHex16(packet.GetU16(&offset));
        request_ack_packet.PutHex32(packet.GetU32(&offset));
        m_is_running.SetValue(false, eBroadcastAlways);
        // Ack to the exception or termination
        SendRequestPacketNoLock(request_ack_packet);
      }
      // Fall through to case below to get packet contents
      LLVM_FALLTHROUGH;
    case ePacketTypeReply | KDP_CONNECT:
    case ePacketTypeReply | KDP_DISCONNECT:
    case ePacketTypeReply | KDP_HOSTINFO:
    case ePacketTypeReply | KDP_VERSION:
    case ePacketTypeReply | KDP_MAXBYTES:
    case ePacketTypeReply | KDP_READMEM:
    case ePacketTypeReply | KDP_WRITEMEM:
    case ePacketTypeReply | KDP_READREGS:
    case ePacketTypeReply | KDP_WRITEREGS:
    case ePacketTypeReply | KDP_LOAD:
    case ePacketTypeReply | KDP_IMAGEPATH:
    case ePacketTypeReply | KDP_SUSPEND:
    case ePacketTypeReply | KDP_RESUMECPUS:
    case ePacketTypeReply | KDP_BREAKPOINT_SET:
    case ePacketTypeReply | KDP_BREAKPOINT_REMOVE:
    case ePacketTypeReply | KDP_REGIONS:
    case ePacketTypeReply | KDP_REATTACH:
    case ePacketTypeReply | KDP_HOSTREBOOT:
    case ePacketTypeReply | KDP_READMEM64:
    case ePacketTypeReply | KDP_WRITEMEM64:
    case ePacketTypeReply | KDP_BREAKPOINT_SET64:
    case ePacketTypeReply | KDP_BREAKPOINT_REMOVE64:
    case ePacketTypeReply | KDP_KERNELVERSION:
    case ePacketTypeReply | KDP_READPHYSMEM64:
    case ePacketTypeReply | KDP_WRITEPHYSMEM64:
    case ePacketTypeReply | KDP_READIOPORT:
    case ePacketTypeReply | KDP_WRITEIOPORT:
    case ePacketTypeReply | KDP_READMSR64:
    case ePacketTypeReply | KDP_WRITEMSR64:
    case ePacketTypeReply | KDP_DUMPINFO: {
      offset = 2;
      const uint16_t length = packet.GetU16(&offset);
      if (length <= bytes_available) {
        // We have an entire packet ready, we need to copy the data bytes into
        // a buffer that will be owned by the packet and erase the bytes from
        // our communcation buffer "m_bytes"
        packet.SetData(DataBufferSP(new DataBufferHeap(&m_bytes[0], length)));
        m_bytes.erase(0, length);

        if (log) {
          PacketStreamType log_strm;
          DumpPacket(log_strm, packet);

          log->Printf("%.*s", (uint32_t)log_strm.GetSize(), log_strm.GetData());
        }
        return true;
      }
    } break;

    default:
      // Unrecognized reply command byte, erase this byte and try to get back
      // on track
      if (log)
        log->Printf("CommunicationKDP::%s: tossing junk byte: 0x%2.2x",
                    __FUNCTION__, (uint8_t)m_bytes[0]);
      m_bytes.erase(0, 1);
      break;
    }
  }
//.........这里部分代码省略.........

    virtual void
    CalculateMnemonicOperandsAndComment (const lldb_private::ExecutionContext *exe_ctx)
    {
        DataExtractor data;
        const AddressClass address_class = GetAddressClass ();

        if (m_opcode.GetData(data, address_class))
        {
            char out_string[512];
            
            ::LLVMDisasmContextRef disasm_context;
            
            if (address_class == eAddressClassCodeAlternateISA)
                disasm_context = m_disasm.m_alternate_disasm_context;
            else
                disasm_context = m_disasm.m_disasm_context;
            
            lldb::addr_t pc = LLDB_INVALID_ADDRESS;
            
            if (exe_ctx)
            {
                Target *target = exe_ctx->GetTargetPtr();
                if (target)
                    pc = m_address.GetLoadAddress(target);
            }
            
            if (pc == LLDB_INVALID_ADDRESS)
                pc = m_address.GetFileAddress();
            
            m_disasm.Lock(this, exe_ctx);
            uint8_t *opcode_data = const_cast<uint8_t *>(data.PeekData (0, 1));
            const size_t opcode_data_len = data.GetByteSize();
            size_t inst_size = ::LLVMDisasmInstruction (disasm_context,
                                                        opcode_data,
                                                        opcode_data_len,
                                                        pc,
                                                        out_string,
                                                        sizeof(out_string));
            
            m_disasm.Unlock();
            
            if (inst_size == 0)
            {
                m_comment.assign ("unknown opcode");
                inst_size = m_opcode.GetByteSize();
                StreamString mnemonic_strm;
                uint32_t offset = 0;
                switch (inst_size)
                {
                    case 1:
                        {
                            const uint8_t uval8 = data.GetU8 (&offset);
                            m_opcode.SetOpcode8 (uval8);
                            m_opcode_name.assign (".byte");
                            mnemonic_strm.Printf("0x%2.2x", uval8);
                        }
                        break;
                    case 2:
                        {
                            const uint16_t uval16 = data.GetU16(&offset);
                            m_opcode.SetOpcode16(uval16);
                            m_opcode_name.assign (".short");
                            mnemonic_strm.Printf("0x%4.4x", uval16);
                        }
                        break;
                    case 4:
                        {
                            const uint32_t uval32 = data.GetU32(&offset);
                            m_opcode.SetOpcode32(uval32);
                            m_opcode_name.assign (".long");
                            mnemonic_strm.Printf("0x%8.8x", uval32);
                        }
                        break;
                    case 8:
                        {
                            const uint64_t uval64 = data.GetU64(&offset);
                            m_opcode.SetOpcode64(uval64);
                            m_opcode_name.assign (".quad");
                            mnemonic_strm.Printf("0x%16.16llx", uval64);
                        }
                        break;
                    default:
                        if (inst_size == 0)
                            return;
                        else
                        {
                            const uint8_t *bytes = data.PeekData(offset, inst_size);
                            if (bytes == NULL)
                                return;
                            m_opcode_name.assign (".byte");
                            m_opcode.SetOpcodeBytes(bytes, inst_size);
                            mnemonic_strm.Printf("0x%2.2x", bytes[0]);
                            for (uint32_t i=1; i<inst_size; ++i)
                                mnemonic_strm.Printf(" 0x%2.2x", bytes[i]);
                        }
                        break;
                }
                m_mnemocics.swap(mnemonic_strm.GetString());
                return;
            }
//.........这里部分代码省略.........

void
SystemRuntimeMacOSX::ReadLibdispatchTSDIndexes ()
{
    if (m_libdispatch_tsd_indexes.IsValid())
        return;

    ReadLibdispatchTSDIndexesAddress ();

    if (m_dispatch_tsd_indexes_addr != LLDB_INVALID_ADDRESS)
    {
        size_t maximum_tsd_indexes_struct_size;
        Address dti_struct_addr;
        uint16_t dti_version = 2;
        if (m_process->GetTarget().ResolveLoadAddress(m_dispatch_tsd_indexes_addr, dti_struct_addr))
        {
            Error error;
            uint16_t version = m_process->GetTarget().ReadUnsignedIntegerFromMemory (dti_struct_addr, false, 2, UINT16_MAX, error);
            if (error.Success() && dti_version != UINT16_MAX)
            {
                dti_version = version;
            }
        }
        if (dti_version == 1)
        {
            if (m_process->GetAddressByteSize() == 4)
            {
                maximum_tsd_indexes_struct_size = 4 + 4 + 4 + 4;
            }
            else
            {
                maximum_tsd_indexes_struct_size = 8 + 8 + 8 + 8;
            }
        }
        else
        {
            maximum_tsd_indexes_struct_size = 2 + 2 + 2 + 2;
        }

        uint8_t memory_buffer[maximum_tsd_indexes_struct_size];
        DataExtractor data (memory_buffer, 
                            sizeof(memory_buffer), 
                            m_process->GetByteOrder(), 
                            m_process->GetAddressByteSize());
        Error error;
        if (m_process->ReadMemory (m_dispatch_tsd_indexes_addr, memory_buffer, sizeof(memory_buffer), error) == sizeof(memory_buffer))
        {
            lldb::offset_t offset = 0;
    
            if (dti_version == 1)
            {
                m_libdispatch_tsd_indexes.dti_version = data.GetU16 (&offset);
                // word alignment to next item
                if (m_process->GetAddressByteSize() == 4)
                {
                    offset += 2;
                }
                else
                {
                    offset += 6;
                }
                m_libdispatch_tsd_indexes.dti_queue_index = data.GetPointer (&offset);
                m_libdispatch_tsd_indexes.dti_voucher_index = data.GetPointer (&offset);
                m_libdispatch_tsd_indexes.dti_qos_class_index = data.GetPointer (&offset);
            }
            else
            {
                m_libdispatch_tsd_indexes.dti_version = data.GetU16 (&offset);
                m_libdispatch_tsd_indexes.dti_queue_index = data.GetU16 (&offset);
                m_libdispatch_tsd_indexes.dti_voucher_index = data.GetU16 (&offset);
                m_libdispatch_tsd_indexes.dti_qos_class_index = data.GetU16 (&offset);
            }
        }
    }
}

bool
DWARFFormValue::SkipValue(dw_form_t form, const DataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu)
{
    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:
        if (cu->GetVersion() <= 2)
            *offset_ptr += DWARFCompileUnit::GetAddressByteSize(cu);
        else
            *offset_ptr += 4;// 4 for DWARF32, 8 for DWARF64, but we don't support DWARF64 yet
        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:
        *offset_ptr += 4;
        return true;

    // 4 byte values
    case DW_FORM_strp:
    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;
}

bool
RegisterContextMach_i386::WriteRegisterBytes (uint32_t reg, DataExtractor &data, uint32_t data_offset)
{
    int set = GetSetForNativeRegNum (reg);

    if (set == -1)
        return false;

    if (ReadRegisterSet(set, false) != KERN_SUCCESS)
        return false;


    const RegisterInfo * reg_info = GetRegisterInfoAtIndex (reg);
    if (reg_info == NULL && data.ValidOffsetForDataOfSize(data_offset, reg_info->byte_size))
        return false;

    uint32_t offset = data_offset;
    switch (reg)
    {
    case gpr_eax:
    case gpr_ebx:
    case gpr_ecx:
    case gpr_edx:
    case gpr_edi:
    case gpr_esi:
    case gpr_ebp:
    case gpr_esp:
    case gpr_ss:
    case gpr_eflags:
    case gpr_eip:
    case gpr_cs:
    case gpr_ds:
    case gpr_es:
    case gpr_fs:
    case gpr_gs:
        (&gpr.eax)[reg - gpr_eax] = data.GetU32 (&offset);
        break;

    case fpu_fcw:
        fpu.fcw = data.GetU16(&offset);
        break;

    case fpu_fsw:
        fpu.fsw = data.GetU16(&offset);
        break;

    case fpu_ftw:
        fpu.ftw = data.GetU8(&offset);
        break;

    case fpu_fop:
        fpu.fop = data.GetU16(&offset);
        break;

    case fpu_ip:
        fpu.ip = data.GetU32(&offset);
        break;

    case fpu_cs:
        fpu.cs = data.GetU16(&offset);
        break;

    case fpu_dp:
        fpu.dp = data.GetU32(&offset);
        break;

    case fpu_ds:
        fpu.ds = data.GetU16(&offset);
        break;

    case fpu_mxcsr:
        fpu.mxcsr = data.GetU32(&offset);
        break;

    case fpu_mxcsrmask:
        fpu.mxcsrmask = data.GetU32(&offset);
        break;

    case fpu_stmm0:
    case fpu_stmm1:
    case fpu_stmm2:
    case fpu_stmm3:
    case fpu_stmm4:
    case fpu_stmm5:
    case fpu_stmm6:
    case fpu_stmm7:
        ::memcpy (fpu.stmm[reg - fpu_stmm0].bytes, data.PeekData(offset, reg_info->byte_size), reg_info->byte_size);
        return false;

    case fpu_xmm0:
    case fpu_xmm1:
    case fpu_xmm2:
    case fpu_xmm3:
    case fpu_xmm4:
    case fpu_xmm5:
    case fpu_xmm6:
    case fpu_xmm7:
        // These values don't fit into scalar types, RegisterContext::ReadRegisterBytes()
        // must be used for these registers
        ::memcpy (fpu.xmm[reg - fpu_xmm0].bytes, data.PeekData(offset, reg_info->byte_size), reg_info->byte_size);
//.........这里部分代码省略.........

void
SystemRuntimeMacOSX::ParseLdiHeaders ()
{
    if (m_ldi_header.initialized)
        return;
    static ConstString ldi_header_symbol ("ldi_infos");
    SymbolContextList sc_list;
    if (m_process->GetTarget().GetImages().FindSymbolsWithNameAndType (ldi_header_symbol, eSymbolTypeData, sc_list) > 0)
    {
        SymbolContext sc;
        sc_list.GetContextAtIndex (0, sc);
        AddressRange addr_range;
        sc.GetAddressRange (eSymbolContextSymbol, 0, false, addr_range);

        Error error;
        Address ldi_header_addr = addr_range.GetBaseAddress();
        uint8_t version_buf[6];   // version, ldi_header_size, initialized fields
        DataExtractor data (version_buf, sizeof(version_buf), m_process->GetByteOrder(), m_process->GetAddressByteSize());
        const size_t count = sizeof (version_buf);
        const bool prefer_file_cache = false;
        if (m_process->GetTarget().ReadMemory (ldi_header_addr, prefer_file_cache, version_buf, count, error) == sizeof (version_buf))
        {
            int version, initialized, ldi_header_size;
            offset_t offset = 0;
            version = data.GetU16(&offset);
            ldi_header_size = data.GetU16(&offset);
            initialized = data.GetU16(&offset);
            if (initialized)
            {
                DataBufferHeap ldi_header (ldi_header_size, 0);
                DataExtractor ldi_extractor (ldi_header.GetBytes(), ldi_header.GetByteSize(), m_process->GetByteOrder(), m_process->GetAddressByteSize());
                if (m_process->GetTarget().ReadMemory (ldi_header_addr, prefer_file_cache, ldi_header.GetBytes(), ldi_header.GetByteSize(), error) == ldi_header.GetByteSize())
                {
                    offset = 0;
                    m_ldi_header.version = ldi_extractor.GetU16(&offset);
                    m_ldi_header.ldi_header_size = ldi_extractor.GetU16(&offset);
                    m_ldi_header.initialized = ldi_extractor.GetU16(&offset);
                    m_ldi_header.queue_size = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_size = ldi_extractor.GetU16(&offset);

                    // 6 bytes of padding here
                    offset += 6;

                    m_ldi_header.queues_head_ptr_address = ldi_extractor.GetU64(&offset);
                    m_ldi_header.items_head_ptr_address = ldi_extractor.GetU64(&offset);

                    m_ldi_header.queue_offsets.next = ldi_extractor.GetU16(&offset);
                    m_ldi_header.queue_offsets.prev = ldi_extractor.GetU16(&offset);
                    m_ldi_header.queue_offsets.queue_id = ldi_extractor.GetU16(&offset);
                    m_ldi_header.queue_offsets.current_item_ptr = ldi_extractor.GetU16(&offset);

                    m_ldi_header.item_offsets.next = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.prev = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.type = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.identifier = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.stop_id = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.backtrace_length = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.backtrace_ptr = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.thread_name_ptr = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.queue_name_ptr = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.unique_thread_id = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.pthread_id = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.enqueueing_thread_dispatch_queue_t = ldi_extractor.GetU16(&offset);
                    m_ldi_header.item_offsets.enqueueing_thread_dispatch_block_ptr = ldi_extractor.GetU16(&offset);

                    if (ldi_header.GetByteSize () > offset)
                    {
                        m_ldi_header.item_offsets.queue_id_from_thread_info = ldi_extractor.GetU16(&offset);
                    }
                    else
                    {
                        m_ldi_header.item_offsets.queue_id_from_thread_info = 0xffff;
                    }
                }
            }
        }
    }
}

bool
DWARFDebugArangeSet::Extract(const DataExtractor &data, lldb::offset_t *offset_ptr)
{
    if (data.ValidOffset(*offset_ptr))
    {
        m_arange_descriptors.clear();
        m_offset = *offset_ptr;

        // 7.20 Address Range Table
        //
        // Each set of entries in the table of address ranges contained in
        // the .debug_aranges section begins with a header consisting of: a
        // 4-byte length containing the length of the set of entries for this
        // compilation unit, not including the length field itself; a 2-byte
        // version identifier containing the value 2 for DWARF Version 2; a
        // 4-byte offset into the.debug_infosection; a 1-byte unsigned integer
        // containing the size in bytes of an address (or the offset portion of
        // an address for segmented addressing) on the target system; and a
        // 1-byte unsigned integer containing the size in bytes of a segment
        // descriptor on the target system. This header is followed by a series
        // of tuples. Each tuple consists of an address and a length, each in
        // the size appropriate for an address on the target architecture.
        m_header.length     = data.GetU32(offset_ptr);
        m_header.version    = data.GetU16(offset_ptr);
        m_header.cu_offset  = data.GetU32(offset_ptr);
        m_header.addr_size  = data.GetU8(offset_ptr);
        m_header.seg_size   = data.GetU8(offset_ptr);


        // The first tuple following the header in each set begins at an offset
        // that is a multiple of the size of a single tuple (that is, twice the
        // size of an address). The header is padded, if necessary, to the
        // appropriate boundary.
        const uint32_t header_size = *offset_ptr - m_offset;
        const uint32_t tuple_size = m_header.addr_size << 1;
        uint32_t first_tuple_offset = 0;
        while (first_tuple_offset < header_size)
            first_tuple_offset += tuple_size;

        *offset_ptr = m_offset + first_tuple_offset;

        Descriptor arangeDescriptor;

        assert(sizeof(arangeDescriptor.address) == sizeof(arangeDescriptor.length));
        assert(sizeof(arangeDescriptor.address) >= m_header.addr_size);

        while (data.ValidOffset(*offset_ptr))
        {
            arangeDescriptor.address    = data.GetMaxU64(offset_ptr, m_header.addr_size);
            arangeDescriptor.length     = data.GetMaxU64(offset_ptr, m_header.addr_size);

            // Each set of tuples is terminated by a 0 for the address and 0
            // for the length.
            if (arangeDescriptor.address || arangeDescriptor.length)
                m_arange_descriptors.push_back(arangeDescriptor);
            else
                break;  // We are done if we get a zero address and length
        }

        return !m_arange_descriptors.empty();
    }
    return false;
}

void CommunicationKDP::DumpPacket(Stream &s, const DataExtractor &packet) {
  const char *error_desc = NULL;
  if (packet.GetByteSize() < 8) {
    error_desc = "error: invalid packet (too short): ";
  } else {
    lldb::offset_t offset = 0;
    const uint8_t first_packet_byte = packet.GetU8(&offset);
    const uint8_t sequence_id = packet.GetU8(&offset);
    const uint16_t length = packet.GetU16(&offset);
    const uint32_t key = packet.GetU32(&offset);
    const CommandType command = ExtractCommand(first_packet_byte);
    const char *command_name = GetCommandAsCString(command);
    if (command_name) {
      const bool is_reply = ExtractIsReply(first_packet_byte);
      s.Printf("(running=%i) %s %24s: 0x%2.2x 0x%2.2x 0x%4.4x 0x%8.8x ",
               IsRunning(), is_reply ? "<--" : "-->", command_name,
               first_packet_byte, sequence_id, length, key);

      if (is_reply) {
        // Dump request reply packets
        switch (command) {
        // Commands that return a single 32 bit error
        case KDP_CONNECT:
        case KDP_WRITEMEM:
        case KDP_WRITEMEM64:
        case KDP_BREAKPOINT_SET:
        case KDP_BREAKPOINT_REMOVE:
        case KDP_BREAKPOINT_SET64:
        case KDP_BREAKPOINT_REMOVE64:
        case KDP_WRITEREGS:
        case KDP_LOAD:
        case KDP_WRITEIOPORT:
        case KDP_WRITEMSR64: {
          const uint32_t error = packet.GetU32(&offset);
          s.Printf(" (error=0x%8.8x)", error);
        } break;

        case KDP_DISCONNECT:
        case KDP_REATTACH:
        case KDP_HOSTREBOOT:
        case KDP_SUSPEND:
        case KDP_RESUMECPUS:
        case KDP_EXCEPTION:
        case KDP_TERMINATION:
          // No return value for the reply, just the header to ack
          s.PutCString(" ()");
          break;

        case KDP_HOSTINFO: {
          const uint32_t cpu_mask = packet.GetU32(&offset);
          const uint32_t cpu_type = packet.GetU32(&offset);
          const uint32_t cpu_subtype = packet.GetU32(&offset);
          s.Printf(" (cpu_mask=0x%8.8x, cpu_type=0x%8.8x, cpu_subtype=0x%8.8x)",
                   cpu_mask, cpu_type, cpu_subtype);
        } break;

        case KDP_VERSION: {
          const uint32_t version = packet.GetU32(&offset);
          const uint32_t feature = packet.GetU32(&offset);
          s.Printf(" (version=0x%8.8x, feature=0x%8.8x)", version, feature);
        } break;

        case KDP_REGIONS: {
          const uint32_t region_count = packet.GetU32(&offset);
          s.Printf(" (count = %u", region_count);
          for (uint32_t i = 0; i < region_count; ++i) {
            const addr_t region_addr = packet.GetPointer(&offset);
            const uint32_t region_size = packet.GetU32(&offset);
            const uint32_t region_prot = packet.GetU32(&offset);
            s.Printf("\n\tregion[%" PRIu64 "] = { range = [0x%16.16" PRIx64
                     " - 0x%16.16" PRIx64 "), size = 0x%8.8x, prot = %s }",
                     region_addr, region_addr, region_addr + region_size,
                     region_size, GetPermissionsAsCString(region_prot));
          }
        } break;

        case KDP_READMEM:
        case KDP_READMEM64:
        case KDP_READPHYSMEM64: {
          const uint32_t error = packet.GetU32(&offset);
          const uint32_t count = packet.GetByteSize() - offset;
          s.Printf(" (error = 0x%8.8x:\n", error);
          if (count > 0)
            DumpDataExtractor(packet, 
                              &s,                      // Stream to dump to
                              offset,                  // Offset within "packet"
                              eFormatBytesWithASCII,   // Format to use
                              1,                       // Size of each item 
                                                       // in bytes
                              count,                   // Number of items
                              16,                      // Number per line
                              m_last_read_memory_addr, // Don't show addresses
                                                       // before each line
                              0, 0);                   // No bitfields
        } break;

        case KDP_READREGS: {
          const uint32_t error = packet.GetU32(&offset);
          const uint32_t count = packet.GetByteSize() - offset;
          s.Printf(" (error = 0x%8.8x regs:\n", error);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
          clang::ASTContext *ast = clang_ast->getASTContext();
          if (ast) {
            llvm::SmallVector<char, 256> sv;
            // Show full precision when printing float values
            const unsigned format_precision = 0;
            const unsigned format_max_padding = 100;
            size_t item_bit_size = item_byte_size * 8;

            if (item_bit_size == ast->getTypeSize(ast->FloatTy)) {
              llvm::APInt apint(item_bit_size,
                                DE.GetMaxU64(&offset, item_byte_size));
              llvm::APFloat apfloat(ast->getFloatTypeSemantics(ast->FloatTy),
                                    apint);
              apfloat.toString(sv, format_precision, format_max_padding);
            } else if (item_bit_size == ast->getTypeSize(ast->DoubleTy)) {
              llvm::APInt apint;
              if (GetAPInt(DE, &offset, item_byte_size, apint)) {
                llvm::APFloat apfloat(ast->getFloatTypeSemantics(ast->DoubleTy),
                                      apint);
                apfloat.toString(sv, format_precision, format_max_padding);
              }
            } else if (item_bit_size == ast->getTypeSize(ast->LongDoubleTy)) {
              const auto &semantics =
                  ast->getFloatTypeSemantics(ast->LongDoubleTy);
              const auto byte_size =
                  (llvm::APFloat::getSizeInBits(semantics) + 7) / 8;

              llvm::APInt apint;
              if (GetAPInt(DE, &offset, byte_size, apint)) {
                llvm::APFloat apfloat(semantics, apint);
                apfloat.toString(sv, format_precision, format_max_padding);
              }
            } else if (item_bit_size == ast->getTypeSize(ast->HalfTy)) {
              llvm::APInt apint(item_bit_size, DE.GetU16(&offset));
              llvm::APFloat apfloat(ast->getFloatTypeSemantics(ast->HalfTy),
                                    apint);
              apfloat.toString(sv, format_precision, format_max_padding);
            }

            if (!sv.empty()) {
              s->Printf("%*.*s", (int)sv.size(), (int)sv.size(), sv.data());
              used_apfloat = true;
            }
          }
        }
      }

      if (!used_apfloat) {
        std::ostringstream ss;
        if (item_byte_size == sizeof(float) || item_byte_size == 2) {
          float f;
          if (item_byte_size == 2) {
            uint16_t half = DE.GetU16(&offset);
            f = half2float(half);
          } else {
            f = DE.GetFloat(&offset);
          }
          ss.precision(std::numeric_limits<float>::digits10);
          ss << f;
        } else if (item_byte_size == sizeof(double)) {
          ss.precision(std::numeric_limits<double>::digits10);
          ss << DE.GetDouble(&offset);
        } else if (item_byte_size == sizeof(long double) ||
                   item_byte_size == 10) {
          ss.precision(std::numeric_limits<long double>::digits10);
          ss << DE.GetLongDouble(&offset);

//.........这里部分代码省略.........
        sint = data.GetSLEB128(offset_ptr);
        s.Printf("%llu %lli", uint, sint);
        return 0;
    }
    if (opcode_class != DRC_ONEOPERAND)
    {
        s.Printf("UNKNOWN OP %u", opcode);
        return 1;
    }

    switch (opcode)
    {
        case DW_OP_addr:    size = address_size;    break;
        case DW_OP_const1u: size = 1;               break;
        case DW_OP_const1s: size = -1;              break;
        case DW_OP_const2u: size = 2;               break;
        case DW_OP_const2s: size = -2;              break;
        case DW_OP_const4u: size = 4;               break;
        case DW_OP_const4s: size = -4;              break;
        case DW_OP_const8u: size = 8;               break;
        case DW_OP_const8s: size = -8;              break;
        case DW_OP_constu:  size = 128;             break;
        case DW_OP_consts:  size = -128;            break;
        case DW_OP_fbreg:   size = -128;            break;
        case DW_OP_breg0:
        case DW_OP_breg1:
        case DW_OP_breg2:
        case DW_OP_breg3:
        case DW_OP_breg4:
        case DW_OP_breg5:
        case DW_OP_breg6:
        case DW_OP_breg7:
        case DW_OP_breg8:
        case DW_OP_breg9:
        case DW_OP_breg10:
        case DW_OP_breg11:
        case DW_OP_breg12:
        case DW_OP_breg13:
        case DW_OP_breg14:
        case DW_OP_breg15:
        case DW_OP_breg16:
        case DW_OP_breg17:
        case DW_OP_breg18:
        case DW_OP_breg19:
        case DW_OP_breg20:
        case DW_OP_breg21:
        case DW_OP_breg22:
        case DW_OP_breg23:
        case DW_OP_breg24:
        case DW_OP_breg25:
        case DW_OP_breg26:
        case DW_OP_breg27:
        case DW_OP_breg28:
        case DW_OP_breg29:
        case DW_OP_breg30:
        case DW_OP_breg31:
            size = -128; break;
        case DW_OP_pick:
            size = 1;       break;
        case DW_OP_deref_size:
            size = 1;       break;
        case DW_OP_xderef_size:
            size = 1;       break;
        case DW_OP_plus_uconst:
            size = 128;     break;
        case DW_OP_skip:
            size = -2;      break;
        case DW_OP_bra:
            size = -2;      break;
        case DW_OP_call2:
            size = 2;       break;
        case DW_OP_call4:
            size = 4;       break;
        case DW_OP_call_ref:
            size = dwarf_ref_size;  break;
        case DW_OP_piece:
            size = 128; break;
        case DW_OP_regx:
            size = 128; break;
        default:
            s.Printf("UNKNOWN ONE-OPERAND OPCODE, #%u", opcode);
            return 1;
    }

    switch (size)
    {
    case -1:    sint = (int8_t)     data.GetU8(offset_ptr);     s.Printf("%+lli", sint); break;
    case -2:    sint = (int16_t)    data.GetU16(offset_ptr);    s.Printf("%+lli", sint); break;
    case -4:    sint = (int32_t)    data.GetU32(offset_ptr);    s.Printf("%+lli", sint); break;
    case -8:    sint = (int64_t)    data.GetU64(offset_ptr);    s.Printf("%+lli", sint); break;
    case -128:  sint = data.GetSLEB128(offset_ptr);             s.Printf("%+lli", sint); break;
    case 1:     uint = data.GetU8(offset_ptr);                  s.Printf("0x%2.2llx", uint); break;
    case 2:     uint = data.GetU16(offset_ptr);                 s.Printf("0x%4.4llx", uint); break;
    case 4:     uint = data.GetU32(offset_ptr);                 s.Printf("0x%8.8llx", uint); break;
    case 8:     uint = data.GetU64(offset_ptr);                 s.Printf("0x%16.16llx", uint); break;
    case 128:   uint = data.GetULEB128(offset_ptr);             s.Printf("0x%llx", uint); break;
    }

    return 0;
}

//----------------------------------------------------------------------
// ParseDOSHeader
//----------------------------------------------------------------------
bool ObjectFilePECOFF::ParseDOSHeader(DataExtractor &data,
                                      dos_header_t &dos_header) {
  bool success = false;
  lldb::offset_t offset = 0;
  success = data.ValidOffsetForDataOfSize(0, sizeof(dos_header));

  if (success) {
    dos_header.e_magic = data.GetU16(&offset); // Magic number
    success = dos_header.e_magic == IMAGE_DOS_SIGNATURE;

    if (success) {
      dos_header.e_cblp = data.GetU16(&offset); // Bytes on last page of file
      dos_header.e_cp = data.GetU16(&offset);   // Pages in file
      dos_header.e_crlc = data.GetU16(&offset); // Relocations
      dos_header.e_cparhdr =
          data.GetU16(&offset); // Size of header in paragraphs
      dos_header.e_minalloc =
          data.GetU16(&offset); // Minimum extra paragraphs needed
      dos_header.e_maxalloc =
          data.GetU16(&offset);               // Maximum extra paragraphs needed
      dos_header.e_ss = data.GetU16(&offset); // Initial (relative) SS value
      dos_header.e_sp = data.GetU16(&offset); // Initial SP value
      dos_header.e_csum = data.GetU16(&offset); // Checksum
      dos_header.e_ip = data.GetU16(&offset);   // Initial IP value
      dos_header.e_cs = data.GetU16(&offset);   // Initial (relative) CS value
      dos_header.e_lfarlc =
          data.GetU16(&offset); // File address of relocation table
      dos_header.e_ovno = data.GetU16(&offset); // Overlay number

      dos_header.e_res[0] = data.GetU16(&offset); // Reserved words
      dos_header.e_res[1] = data.GetU16(&offset); // Reserved words
      dos_header.e_res[2] = data.GetU16(&offset); // Reserved words
      dos_header.e_res[3] = data.GetU16(&offset); // Reserved words

      dos_header.e_oemid =
          data.GetU16(&offset); // OEM identifier (for e_oeminfo)
      dos_header.e_oeminfo =
          data.GetU16(&offset); // OEM information; e_oemid specific
      dos_header.e_res2[0] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[1] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[2] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[3] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[4] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[5] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[6] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[7] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[8] = data.GetU16(&offset); // Reserved words
      dos_header.e_res2[9] = data.GetU16(&offset); // Reserved words

      dos_header.e_lfanew =
          data.GetU32(&offset); // File address of new exe header
    }
  }
  if (!success)
    memset(&dos_header, 0, sizeof(dos_header));
  return success;
}