C++ DataExtractor::GetCStr方法代码示例

static bool
GetNetBSDProcessArgs (const ProcessInstanceInfoMatch *match_info_ptr,
                      ProcessInstanceInfo &process_info)
{
    if (!process_info.ProcessIDIsValid())
        return false;

    int pid = process_info.GetProcessID();

    int mib[4] = { CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV };

    char arg_data[8192];
    size_t arg_data_size = sizeof(arg_data);
    if (::sysctl (mib, 4, arg_data, &arg_data_size , NULL, 0) != 0)
        return false;

    DataExtractor data (arg_data, arg_data_size, lldb::endian::InlHostByteOrder(), sizeof(void *));
    lldb::offset_t offset = 0;
    const char *cstr;

    cstr = data.GetCStr (&offset);
    if (!cstr)
        return false;

    process_info.GetExecutableFile().SetFile(cstr, false);

    if (!(match_info_ptr == NULL ||
            NameMatches (process_info.GetExecutableFile().GetFilename().GetCString(),
                         match_info_ptr->GetNameMatchType(),
                         match_info_ptr->GetProcessInfo().GetName())))
        return false;

    Args &proc_args = process_info.GetArguments();
    while (1)
    {
        const uint8_t *p = data.PeekData(offset, 1);
        while ((p != NULL) && (*p == '\0') && offset < arg_data_size)
        {
            ++offset;
            p = data.PeekData(offset, 1);
        }
        if (p == NULL || offset >= arg_data_size)
            break;

        cstr = data.GetCStr(&offset);
        if (!cstr)
            break;

        proc_args.AppendArgument(cstr);
    }

    return true;
}

bool
DWARFDebugMacinfoEntry::Extract(const DataExtractor& mac_info_data, dw_offset_t* offset_ptr)
{
    if (mac_info_data.ValidOffset(*offset_ptr))
    {
        m_type_code = mac_info_data.GetU8(offset_ptr);

        switch (m_type_code)
        {

        case DW_MACINFO_define:
        case DW_MACINFO_undef:
            // 2 operands:
            // Arg 1: operand encodes the line number of the source line on which
            //      the relevant defining or undefining pre-processor directives
            //      appeared.
            m_line  = mac_info_data.GetULEB128(offset_ptr);
            // Arg 2: define string
            m_op2.cstr  = mac_info_data.GetCStr(offset_ptr);
            break;

        case DW_MACINFO_start_file:
            // 2 operands:
            // Op 1: line number of the source line on which the inclusion
            //      pre-processor directive occurred.
            m_line  = mac_info_data.GetULEB128(offset_ptr);
            // Op 2: a source file name index to a file number in the statement
            //      information table for the relevant compilation unit.
            m_op2.file_idx  = mac_info_data.GetULEB128(offset_ptr);
            break;

        case 0: // End of list
        case DW_MACINFO_end_file:
            // No operands
            m_line = DW_INVALID_OFFSET;
            m_op2.cstr = NULL;
            break;
        default:
            // Vendor specific entries always have a ULEB128 and a string
            m_line      = mac_info_data.GetULEB128(offset_ptr);
            m_op2.cstr  = mac_info_data.GetCStr(offset_ptr);
            break;
        }
        return true;
    }
    else
        m_type_code = 0;

    return false;
}

static void
ParseFreeBSDThrMisc(ThreadData *thread_data, DataExtractor &data)
{
    lldb::offset_t offset = 0;
    thread_data->name = data.GetCStr(&offset, 20);
}

//.........这里部分代码省略.........
                              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);
          if (count > 0)
            DumpDataExtractor(packet, 
                              &s,                       // Stream to dump to
                              offset,                   // Offset within "packet"
                              eFormatHex,               // Format to use
                              m_addr_byte_size,         // Size of each item 
                                                        // in bytes
                              count / m_addr_byte_size, // Number of items
                              16 / m_addr_byte_size,    // Number per line
                              LLDB_INVALID_ADDRESS, 
                                                        // Don't 
                                                        // show addresses before
                                                        // each line
                              0, 0);                    // No bitfields
        } break;

        case KDP_KERNELVERSION: {
          const char *kernel_version = packet.PeekCStr(8);
          s.Printf(" (version = \"%s\")", kernel_version);
        } break;

        case KDP_MAXBYTES: {
          const uint32_t max_bytes = packet.GetU32(&offset);
          s.Printf(" (max_bytes = 0x%8.8x (%u))", max_bytes, max_bytes);
        } break;
        case KDP_IMAGEPATH: {
          const char *path = packet.GetCStr(&offset);
          s.Printf(" (path = \"%s\")", path);
        } break;

        case KDP_READIOPORT:
        case KDP_READMSR64: {
          const uint32_t error = packet.GetU32(&offset);
          const uint32_t count = packet.GetByteSize() - offset;
          s.Printf(" (error = 0x%8.8x io:\n", error);
          if (count > 0)
            DumpDataExtractor(packet, 
                              &s,                   // Stream to dump to
                              offset,               // Offset within "packet"
                              eFormatHex,           // Format to use
                              1,                    // Size of each item in bytes
                              count,                // Number of items
                              16,                   // Number per line
                              LLDB_INVALID_ADDRESS, // Don't show addresses 
                                                    // before each line
                              0, 0);                // No bitfields
        } break;
        case KDP_DUMPINFO: {
          const uint32_t count = packet.GetByteSize() - offset;
          s.Printf(" (count = %u, bytes = \n", count);
          if (count > 0)
            DumpDataExtractor(packet, 
                              &s,                   // Stream to dump to
                              offset,               // Offset within "packet"
                              eFormatHex,           // Format to use
                              1,                    // Size of each item in 
                                                    // bytes
                              count,                // Number of items
                              16,                   // Number per line

void
SystemRuntimeMacOSX::PopulateQueuesUsingLibBTR (lldb::addr_t queues_buffer, uint64_t queues_buffer_size,
        uint64_t count, lldb_private::QueueList &queue_list)
{
    Error error;
    DataBufferHeap data (queues_buffer_size, 0);
    Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_SYSTEM_RUNTIME));
    if (m_process->ReadMemory (queues_buffer, data.GetBytes(), queues_buffer_size, error) == queues_buffer_size && error.Success())
    {
        // We've read the information out of inferior memory; free it on the next call we make
        m_page_to_free = queues_buffer;
        m_page_to_free_size = queues_buffer_size;

        DataExtractor extractor (data.GetBytes(), data.GetByteSize(), m_process->GetByteOrder(), m_process->GetAddressByteSize());
        offset_t offset = 0;
        uint64_t queues_read = 0;

        // The information about the queues is stored in this format (v1):
        // typedef struct introspection_dispatch_queue_info_s {
        //     uint32_t offset_to_next;
        //     dispatch_queue_t queue;
        //     uint64_t serialnum;     // queue's serialnum in the process, as provided by libdispatch
        //     uint32_t running_work_items_count;
        //     uint32_t pending_work_items_count;
        //
        //     char data[];     // Starting here, we have variable-length data:
        //     // char queue_label[];
        // } introspection_dispatch_queue_info_s;

        while (queues_read < count && offset < queues_buffer_size)
        {
            offset_t    start_of_this_item = offset;

            uint32_t    offset_to_next = extractor.GetU32 (&offset);

            offset += 4; // Skip over the 4 bytes of reserved space
            addr_t      queue = extractor.GetPointer (&offset);
            uint64_t    serialnum = extractor.GetU64 (&offset);
            uint32_t    running_work_items_count = extractor.GetU32 (&offset);
            uint32_t    pending_work_items_count = extractor.GetU32 (&offset);

            // Read the first field of the variable length data
            offset = start_of_this_item + m_lib_backtrace_recording_info.queue_info_data_offset;
            const char *queue_label = extractor.GetCStr (&offset);
            if (queue_label == NULL)
                queue_label = "";

            offset_t    start_of_next_item = start_of_this_item + offset_to_next;
            offset = start_of_next_item;

            if (log)
                log->Printf ("SystemRuntimeMacOSX::PopulateQueuesUsingLibBTR added queue with dispatch_queue_t 0x%" PRIx64 ", serial number 0x%" PRIx64 ", running items %d, pending items %d, name '%s'", queue, serialnum, running_work_items_count, pending_work_items_count, queue_label);

            QueueSP queue_sp (new Queue (m_process->shared_from_this(), serialnum, queue_label));
            queue_sp->SetNumRunningWorkItems (running_work_items_count);
            queue_sp->SetNumPendingWorkItems (pending_work_items_count);
            queue_sp->SetLibdispatchQueueAddress (queue);
            queue_sp->SetKind (GetQueueKind (queue));
            queue_list.AddQueue (queue_sp);
            queues_read++;
        }
    }
}

//.........这里部分代码省略.........
            s->Printf("\\a");
            break;
          case '\b':
            s->Printf("\\b");
            break;
          case '\f':
            s->Printf("\\f");
            break;
          case '\n':
            s->Printf("\\n");
            break;
          case '\r':
            s->Printf("\\r");
            break;
          case '\t':
            s->Printf("\\t");
            break;
          case '\v':
            s->Printf("\\v");
            break;
          case '\0':
            s->Printf("\\0");
            break;
          default:
            s->Printf("\\x%2.2x", ch);
            break;
          }
        }
      }
      s->PutChar('\'');
    } break;

    case eFormatCString: {
      const char *cstr = DE.GetCStr(&offset);

      if (!cstr) {
        s->Printf("NULL");
        offset = LLDB_INVALID_OFFSET;
      } else {
        s->PutChar('\"');

        while (const char c = *cstr) {
          if (isprint(c)) {
            s->PutChar(c);
          } else {
            switch (c) {
            case '\033':
              s->Printf("\\e");
              break;
            case '\a':
              s->Printf("\\a");
              break;
            case '\b':
              s->Printf("\\b");
              break;
            case '\f':
              s->Printf("\\f");
              break;
            case '\n':
              s->Printf("\\n");
              break;
            case '\r':
              s->Printf("\\r");
              break;
            case '\t':
              s->Printf("\\t");

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
DWARFFormValue::ExtractValue(const DataExtractor& data, lldb::offset_t* offset_ptr, const DWARFCompileUnit* cu)
{
    bool indirect = false;
    bool is_block = false;
    m_value.data = NULL;
    // 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 differnence 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.GetU32(offset_ptr);                           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:
            if (cu->GetVersion() <= 2)
                m_value.value.uval = data.GetMaxU64(offset_ptr, DWARFCompileUnit::GetAddressByteSize(cu));
            else
                m_value.value.uval = data.GetU32(offset_ptr); // 4 for DWARF32, 8 for DWARF64, but we don't support DWARF64 yet
            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.GetU32(offset_ptr);                       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;
}