C++ DataExtractor::GetPointer方法代码示例

bool ValueObjectDynamicValue::SetData(DataExtractor &data, Status &error) {
  if (!UpdateValueIfNeeded(false)) {
    error.SetErrorString("unable to read value");
    return false;
  }

  uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
  uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);

  if (my_value == UINT64_MAX || parent_value == UINT64_MAX) {
    error.SetErrorString("unable to read value");
    return false;
  }

  // if we are at an offset from our parent, in order to set ourselves
  // correctly we would need to change the new value so that it refers to the
  // correct dynamic type. we choose not to deal with that - if anything more
  // than a value overwrite is required, you should be using the expression
  // parser instead of the value editing facility
  if (my_value != parent_value) {
    // but NULL'ing out a value should always be allowed
    lldb::offset_t offset = 0;

    if (data.GetPointer(&offset) != 0) {
      error.SetErrorString(
          "unable to modify dynamic value, use 'expression' command");
      return false;
    }
  }

  bool ret_val = m_parent->SetData(data, error);
  SetNeedsUpdate();
  return ret_val;
}

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.........

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++;
        }
    }
}

SystemRuntimeMacOSX::PendingItemsForQueue
SystemRuntimeMacOSX::GetPendingItemRefsForQueue (lldb::addr_t queue)
{
    PendingItemsForQueue pending_item_refs;
    AppleGetPendingItemsHandler::GetPendingItemsReturnInfo pending_items_pointer;
    ThreadSP cur_thread_sp (m_process->GetThreadList().GetSelectedThread());
    if (cur_thread_sp)
    {
        Error error;
        pending_items_pointer = m_get_pending_items_handler.GetPendingItems (*cur_thread_sp.get(), queue, m_page_to_free, m_page_to_free_size, error);
        m_page_to_free = LLDB_INVALID_ADDRESS;
        m_page_to_free_size = 0;
        if (error.Success())
        {
            if (pending_items_pointer.count > 0
                    && pending_items_pointer.items_buffer_size > 0
                    && pending_items_pointer.items_buffer_ptr != 0
                    && pending_items_pointer.items_buffer_ptr != LLDB_INVALID_ADDRESS)
            {
                DataBufferHeap data (pending_items_pointer.items_buffer_size, 0);
                if (m_process->ReadMemory (pending_items_pointer.items_buffer_ptr, data.GetBytes(), pending_items_pointer.items_buffer_size, error))
                {
                    DataExtractor extractor (data.GetBytes(), data.GetByteSize(), m_process->GetByteOrder(), m_process->GetAddressByteSize());

                    // We either have an array of
                    //    void* item_ref
                    // (old style) or we have a structure returned which looks like
                    //
                    // struct introspection_dispatch_pending_item_info_s {
                    //   void *item_ref;
                    //   void *function_or_block;
                    // };
                    //
                    // struct introspection_dispatch_pending_items_array_s {
                    //   uint32_t version;
                    //   uint32_t size_of_item_info;
                    //   introspection_dispatch_pending_item_info_s items[];
                    //   }

                    offset_t offset = 0;
                    int i = 0;
                    uint32_t version = extractor.GetU32(&offset);
                    if (version == 1)
                    {
                        pending_item_refs.new_style = true;
                        uint32_t item_size = extractor.GetU32(&offset);
                        uint32_t start_of_array_offset = offset;
                        while (offset < pending_items_pointer.items_buffer_size &&
                                static_cast<size_t>(i) < pending_items_pointer.count)
                        {
                            offset = start_of_array_offset + (i * item_size);
                            ItemRefAndCodeAddress item;
                            item.item_ref = extractor.GetPointer (&offset);
                            item.code_address = extractor.GetPointer (&offset);
                            pending_item_refs.item_refs_and_code_addresses.push_back (item);
                            i++;
                        }
                    }
                    else
                    {
                        offset = 0;
                        pending_item_refs.new_style = false;
                        while (offset < pending_items_pointer.items_buffer_size &&
                                static_cast<size_t>(i) < pending_items_pointer.count)
                        {
                            ItemRefAndCodeAddress item;
                            item.item_ref = extractor.GetPointer (&offset);
                            item.code_address = LLDB_INVALID_ADDRESS;
                            pending_item_refs.item_refs_and_code_addresses.push_back (item);
                            i++;
                        }
                    }
                }
                m_page_to_free = pending_items_pointer.items_buffer_ptr;
                m_page_to_free_size = pending_items_pointer.items_buffer_size;
            }
        }
    }
    return pending_item_refs;
}

void
AppleObjCRuntimeV1::UpdateISAToDescriptorMapIfNeeded()
{
    // TODO: implement HashTableSignature...
    Process *process = GetProcess();
    
    if (process)
    {
        // Update the process stop ID that indicates the last time we updated the
        // map, whether it was successful or not.
        m_isa_to_descriptor_stop_id = process->GetStopID();
        
        Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
        
        ProcessSP process_sp = process->shared_from_this();
        
        ModuleSP objc_module_sp(GetObjCModule());
        
        if (!objc_module_sp)
            return;
        
        uint32_t isa_count = 0;
        
        lldb::addr_t hash_table_ptr = GetISAHashTablePointer ();
        if (hash_table_ptr != LLDB_INVALID_ADDRESS)
        {
            // Read the NXHashTable struct:
            //
            // typedef struct {
            //     const NXHashTablePrototype *prototype;
            //     unsigned   count;
            //     unsigned   nbBuckets;
            //     void       *buckets;
            //     const void *info;
            // } NXHashTable;

            Error error;
            DataBufferHeap buffer(1024, 0);
            if (process->ReadMemory(hash_table_ptr, buffer.GetBytes(), 20, error) == 20)
            {
                const uint32_t addr_size = m_process->GetAddressByteSize();
                const ByteOrder byte_order = m_process->GetByteOrder();
                DataExtractor data (buffer.GetBytes(), buffer.GetByteSize(), byte_order, addr_size);
                lldb::offset_t offset = addr_size; // Skip prototype
                const uint32_t count = data.GetU32(&offset);
                const uint32_t num_buckets = data.GetU32(&offset);
                const addr_t buckets_ptr = data.GetPointer(&offset);
                if (m_hash_signature.NeedsUpdate (count, num_buckets, buckets_ptr))
                {
                    m_hash_signature.UpdateSignature (count, num_buckets, buckets_ptr);

                    const uint32_t data_size = num_buckets * 2 * sizeof(uint32_t);
                    buffer.SetByteSize(data_size);
                    
                    if (process->ReadMemory(buckets_ptr, buffer.GetBytes(), data_size, error) == data_size)
                    {
                        data.SetData(buffer.GetBytes(), buffer.GetByteSize(), byte_order);
                        offset = 0;
                        for (uint32_t bucket_idx = 0; bucket_idx < num_buckets; ++bucket_idx)
                        {
                            const uint32_t bucket_isa_count = data.GetU32 (&offset);
                            const lldb::addr_t bucket_data = data.GetU32 (&offset);
                            

                            if (bucket_isa_count == 0)
                                continue;
                            
                            isa_count += bucket_isa_count;

                            ObjCISA isa;
                            if (bucket_isa_count == 1)
                            {
                                // When we only have one entry in the bucket, the bucket data is the "isa"
                                isa = bucket_data;
                                if (isa)
                                {
                                    if (!ISAIsCached(isa))
                                    {
                                        ClassDescriptorSP descriptor_sp (new ClassDescriptorV1(isa, process_sp));
                                        
                                        if (log && log->GetVerbose())
                                            log->Printf("AppleObjCRuntimeV1 added (ObjCISA)0x%" PRIx64 " from _objc_debug_class_hash to isa->descriptor cache", isa);
                                        
                                        AddClass (isa, descriptor_sp);
                                    }
                                }
                            }
                            else
                            {
                                // When we have more than one entry in the bucket, the bucket data is a pointer
                                // to an array of "isa" values
                                addr_t isa_addr = bucket_data;
                                for (uint32_t isa_idx = 0; isa_idx < bucket_isa_count; ++isa_idx, isa_addr += addr_size)
                                {
                                    isa = m_process->ReadPointerFromMemory(isa_addr, error);

                                    if (isa && isa != LLDB_INVALID_ADDRESS)
                                    {
                                        if (!ISAIsCached(isa))
                                        {
//.........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
DynamicLoaderMacOSXDYLD::ReadAllImageInfosStructure ()
{
    std::lock_guard<std::recursive_mutex> guard(m_mutex);

    // the all image infos is already valid for this process stop ID
    if (m_process->GetStopID() == m_dyld_all_image_infos_stop_id)
        return true;

    m_dyld_all_image_infos.Clear();
    if (m_dyld_all_image_infos_addr != LLDB_INVALID_ADDRESS)
    {
        ByteOrder byte_order = m_process->GetTarget().GetArchitecture().GetByteOrder();
        uint32_t addr_size = 4;
        if (m_dyld_all_image_infos_addr > UINT32_MAX)
            addr_size = 8;

        uint8_t buf[256];
        DataExtractor data (buf, sizeof(buf), byte_order, addr_size);
        lldb::offset_t offset = 0;

        const size_t count_v2 =  sizeof (uint32_t) + // version
                                 sizeof (uint32_t) + // infoArrayCount
                                 addr_size +         // infoArray
                                 addr_size +         // notification
                                 addr_size +         // processDetachedFromSharedRegion + libSystemInitialized + pad
                                 addr_size;          // dyldImageLoadAddress
        const size_t count_v11 = count_v2 +
                                 addr_size +         // jitInfo
                                 addr_size +         // dyldVersion
                                 addr_size +         // errorMessage
                                 addr_size +         // terminationFlags
                                 addr_size +         // coreSymbolicationShmPage
                                 addr_size +         // systemOrderFlag
                                 addr_size +         // uuidArrayCount
                                 addr_size +         // uuidArray
                                 addr_size +         // dyldAllImageInfosAddress
                                 addr_size +         // initialImageCount
                                 addr_size +         // errorKind
                                 addr_size +         // errorClientOfDylibPath
                                 addr_size +         // errorTargetDylibPath
                                 addr_size;          // errorSymbol
        const size_t count_v13 = count_v11 +
                                 addr_size +         // sharedCacheSlide
                                 sizeof (uuid_t);    // sharedCacheUUID
        UNUSED_IF_ASSERT_DISABLED(count_v13);
        assert (sizeof (buf) >= count_v13);

        Error error;
        if (m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, 4, error) == 4)
        {
            m_dyld_all_image_infos.version = data.GetU32(&offset);
            // If anything in the high byte is set, we probably got the byte 
            // order incorrect (the process might not have it set correctly 
            // yet due to attaching to a program without a specified file).
            if (m_dyld_all_image_infos.version & 0xff000000)
            {
                // We have guessed the wrong byte order. Swap it and try
                // reading the version again.
                if (byte_order == eByteOrderLittle)
                    byte_order = eByteOrderBig;
                else
                    byte_order = eByteOrderLittle;

                data.SetByteOrder (byte_order);
                offset = 0;
                m_dyld_all_image_infos.version = data.GetU32(&offset);
            }
        }
        else
        {
            return false;
        }

        const size_t count = (m_dyld_all_image_infos.version >= 11) ? count_v11 : count_v2;

        const size_t bytes_read = m_process->ReadMemory (m_dyld_all_image_infos_addr, buf, count, error);
        if (bytes_read == count)
        {
            offset = 0;
            m_dyld_all_image_infos.version = data.GetU32(&offset);
            m_dyld_all_image_infos.dylib_info_count = data.GetU32(&offset);
            m_dyld_all_image_infos.dylib_info_addr = data.GetPointer(&offset);
            m_dyld_all_image_infos.notification = data.GetPointer(&offset);
            m_dyld_all_image_infos.processDetachedFromSharedRegion = data.GetU8(&offset);
            m_dyld_all_image_infos.libSystemInitialized = data.GetU8(&offset);
            // Adjust for padding.
            offset += addr_size - 2;
            m_dyld_all_image_infos.dyldImageLoadAddress = data.GetPointer(&offset);
            if (m_dyld_all_image_infos.version >= 11)
            {
                offset += addr_size * 8;
                uint64_t dyld_all_image_infos_addr = data.GetPointer(&offset);

                // When we started, we were given the actual address of the all_image_infos
                // struct (probably via TASK_DYLD_INFO) in memory - this address is stored in
                // m_dyld_all_image_infos_addr and is the most accurate address we have.

                // We read the dyld_all_image_infos struct from memory; it contains its own address.
                // If the address in the struct does not match the actual address,
//.........这里部分代码省略.........