C++ Status::SetErrorString方法代码示例

SearchFilterSP SearchFilterByModule::CreateFromStructuredData(
    Target &target, const StructuredData::Dictionary &data_dict,
    Status &error) {
  StructuredData::Array *modules_array;
  bool success = data_dict.GetValueForKeyAsArray(GetKey(OptionNames::ModList),
                                                 modules_array);
  if (!success) {
    error.SetErrorString("SFBM::CFSD: Could not find the module list key.");
    return nullptr;
  }

  size_t num_modules = modules_array->GetSize();
  if (num_modules > 1) {
    error.SetErrorString(
        "SFBM::CFSD: Only one modules allowed for SearchFilterByModule.");
    return nullptr;
  }

  llvm::StringRef module;
  success = modules_array->GetItemAtIndexAsString(0, module);
  if (!success) {
    error.SetErrorString("SFBM::CFSD: filter module item not a string.");
    return nullptr;
  }
  FileSpec module_spec(module);

  return std::make_shared<SearchFilterByModule>(target.shared_from_this(),
                                                module_spec);
}

void IRMemoryMap::WriteScalarToMemory(lldb::addr_t process_address,
                                      Scalar &scalar, size_t size,
                                      Status &error) {
  error.Clear();

  if (size == UINT32_MAX)
    size = scalar.GetByteSize();

  if (size > 0) {
    uint8_t buf[32];
    const size_t mem_size =
        scalar.GetAsMemoryData(buf, size, GetByteOrder(), error);
    if (mem_size > 0) {
      return WriteMemory(process_address, buf, mem_size, error);
    } else {
      error.SetErrorToGenericError();
      error.SetErrorString(
          "Couldn't write scalar: failed to get scalar as memory data");
    }
  } else {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't write scalar: its size was zero");
  }
  return;
}

Status FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
  Status error;
  std::wstring wsrc;
  if (!llvm::ConvertUTF8toWide(src.GetCString(), wsrc)) {
    error.SetErrorString(PATH_CONVERSION_ERROR);
    return error;
  }

  HANDLE h = ::CreateFileW(wsrc.c_str(), GENERIC_READ,
                           FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
                           OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT, NULL);
  if (h == INVALID_HANDLE_VALUE) {
    error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
    return error;
  }

  std::vector<wchar_t> buf(PATH_MAX + 1);
  // Subtract 1 from the path length since this function does not add a null
  // terminator.
  DWORD result = ::GetFinalPathNameByHandleW(
      h, buf.data(), buf.size() - 1, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
  std::string path;
  if (result == 0)
    error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
  else if (!llvm::convertWideToUTF8(buf.data(), path))
    error.SetErrorString(PATH_CONVERSION_ERROR);
  else
    dst.SetFile(path, false);

  ::CloseHandle(h);
  return error;
}

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;
}

Status ProcessFreeBSD::EnableWatchpoint(Watchpoint *wp, bool notify) {
  Status error;
  if (wp) {
    user_id_t watchID = wp->GetID();
    addr_t addr = wp->GetLoadAddress();
    Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
    if (log)
      log->Printf("ProcessFreeBSD::EnableWatchpoint(watchID = %" PRIu64 ")",
                  watchID);
    if (wp->IsEnabled()) {
      if (log)
        log->Printf("ProcessFreeBSD::EnableWatchpoint(watchID = %" PRIu64
                    ") addr = 0x%8.8" PRIx64 ": watchpoint already enabled.",
                    watchID, (uint64_t)addr);
      return error;
    }

    // Try to find a vacant watchpoint slot in the inferiors' main thread
    uint32_t wp_hw_index = LLDB_INVALID_INDEX32;
    std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
    FreeBSDThread *thread = static_cast<FreeBSDThread *>(
        m_thread_list.GetThreadAtIndex(0, false).get());

    if (thread)
      wp_hw_index = thread->FindVacantWatchpointIndex();

    if (wp_hw_index == LLDB_INVALID_INDEX32) {
      error.SetErrorString("Setting hardware watchpoint failed.");
    } else {
      wp->SetHardwareIndex(wp_hw_index);
      bool wp_enabled = true;
      uint32_t thread_count = m_thread_list.GetSize(false);
      for (uint32_t i = 0; i < thread_count; ++i) {
        thread = static_cast<FreeBSDThread *>(
            m_thread_list.GetThreadAtIndex(i, false).get());
        if (thread)
          wp_enabled &= thread->EnableHardwareWatchpoint(wp);
        else
          wp_enabled = false;
      }
      if (wp_enabled) {
        wp->SetEnabled(true, notify);
        return error;
      } else {
        // Watchpoint enabling failed on at least one of the threads so roll
        // back all of them
        DisableWatchpoint(wp, false);
        error.SetErrorString("Setting hardware watchpoint failed");
      }
    }
  } else
    error.SetErrorString("Watchpoint argument was NULL.");
  return error;
}

uint32_t CommunicationKDP::SendRequestWriteRegisters(uint32_t cpu,
                                                     uint32_t flavor,
                                                     const void *src,
                                                     uint32_t src_len,
                                                     Status &error) {
  PacketStreamType request_packet(Stream::eBinary, m_addr_byte_size,
                                  m_byte_order);
  const CommandType command = KDP_WRITEREGS;
  // Size is header + 4 byte cpu and 4 byte flavor
  const uint32_t command_length = 8 + 4 + 4 + src_len;
  MakeRequestPacketHeader(command, request_packet, command_length);
  request_packet.PutHex32(cpu);
  request_packet.PutHex32(flavor);
  request_packet.Write(src, src_len);
  DataExtractor reply_packet;
  if (SendRequestAndGetReply(command, request_packet, reply_packet)) {
    lldb::offset_t offset = 8;
    uint32_t kdp_error = reply_packet.GetU32(&offset);
    if (kdp_error == 0)
      return src_len;
    error.SetErrorStringWithFormat(
        "failed to read kdp registers for cpu %u flavor %u (error %u)", cpu,
        flavor, kdp_error);
  } else {
    error.SetErrorString("failed to send packet");
  }
  return 0;
}

uint32_t CommunicationKDP::SendRequestWriteMemory(lldb::addr_t addr,
                                                  const void *src,
                                                  uint32_t src_len,
                                                  Status &error) {
  PacketStreamType request_packet(Stream::eBinary, m_addr_byte_size,
                                  m_byte_order);
  bool use_64 = (GetVersion() >= 11);
  uint32_t command_addr_byte_size = use_64 ? 8 : 4;
  const CommandType command = use_64 ? KDP_WRITEMEM64 : KDP_WRITEMEM;
  // Size is header + address size + uint32_t length
  const uint32_t command_length = 8 + command_addr_byte_size + 4 + src_len;
  MakeRequestPacketHeader(command, request_packet, command_length);
  request_packet.PutMaxHex64(addr, command_addr_byte_size);
  request_packet.PutHex32(src_len);
  request_packet.PutRawBytes(src, src_len);

  DataExtractor reply_packet;
  if (SendRequestAndGetReply(command, request_packet, reply_packet)) {
    lldb::offset_t offset = 8;
    uint32_t kdp_error = reply_packet.GetU32(&offset);
    if (kdp_error)
      error.SetErrorStringWithFormat("kdp write memory failed (error %u)",
                                     kdp_error);
    else {
      error.Clear();
      return src_len;
    }
  } else {
    error.SetErrorString("failed to send packet");
  }
  return 0;
}

bool CommunicationKDP::SendRawRequest(
    uint8_t command_byte,
    const void *src,  // Raw packet payload bytes
    uint32_t src_len, // Raw packet payload length
    DataExtractor &reply_packet, Status &error) {
  PacketStreamType request_packet(Stream::eBinary, m_addr_byte_size,
                                  m_byte_order);
  // Size is header + address size + uint32_t length
  const uint32_t command_length = 8 + src_len;
  const CommandType command = (CommandType)command_byte;
  MakeRequestPacketHeader(command, request_packet, command_length);
  request_packet.PutRawBytes(src, src_len);

  if (SendRequestAndGetReply(command, request_packet, reply_packet)) {
    lldb::offset_t offset = 8;
    uint32_t kdp_error = reply_packet.GetU32(&offset);
    if (kdp_error && (command_byte != KDP_DUMPINFO))
      error.SetErrorStringWithFormat("request packet 0x%8.8x failed (error %u)",
                                     command_byte, kdp_error);
    else {
      error.Clear();
      return true;
    }
  } else {
    error.SetErrorString("failed to send packet");
  }
  return false;
}

lldb_private::Status PlatformAppleSimulator::LaunchProcess(
    lldb_private::ProcessLaunchInfo &launch_info) {
#if defined(__APPLE__)
  LoadCoreSimulator();
  CoreSimulatorSupport::Device device(GetSimulatorDevice());

  if (device.GetState() != CoreSimulatorSupport::Device::State::Booted) {
    Status boot_err;
    device.Boot(boot_err);
    if (boot_err.Fail())
      return boot_err;
  }

  auto spawned = device.Spawn(launch_info);

  if (spawned) {
    launch_info.SetProcessID(spawned.GetPID());
    return Status();
  } else
    return spawned.GetError();
#else
  Status err;
  err.SetErrorString(UNSUPPORTED_ERROR);
  return err;
#endif
}

Status NativeRegisterContextLinux_mips64::SetHardwareWatchpointWithIndex(
    lldb::addr_t addr, size_t size, uint32_t watch_flags, uint32_t wp_index) {
  Status error;
  error.SetErrorString("MIPS TODO: "
                       "NativeRegisterContextLinux_mips64::"
                       "SetHardwareWatchpointWithIndex not implemented");
  return error;
}

Status HostProcessPosix::Signal(int signo) const {
  if (m_process == kInvalidPosixProcess) {
    Status error;
    error.SetErrorString("HostProcessPosix refers to an invalid process");
    return error;
  }

  return HostProcessPosix::Signal(m_process, signo);
}

Materializer::DematerializerSP
Materializer::Materialize(lldb::StackFrameSP &frame_sp, IRMemoryMap &map,
                          lldb::addr_t process_address, Status &error) {
  ExecutionContextScope *exe_scope = frame_sp.get();

  if (!exe_scope)
    exe_scope = map.GetBestExecutionContextScope();

  DematerializerSP dematerializer_sp = m_dematerializer_wp.lock();

  if (dematerializer_sp) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't materialize: already materialized");
  }

  DematerializerSP ret(
      new Dematerializer(*this, frame_sp, map, process_address));

  if (!exe_scope) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't materialize: target doesn't exist");
  }

  for (EntityUP &entity_up : m_entities) {
    entity_up->Materialize(frame_sp, map, process_address, error);

    if (!error.Success())
      return DematerializerSP();
  }

  if (Log *log =
          lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
    log->Printf(
        "Materializer::Materialize (frame_sp = %p, process_address = 0x%" PRIx64
        ") materialized:",
        static_cast<void *>(frame_sp.get()), process_address);
    for (EntityUP &entity_up : m_entities)
      entity_up->DumpToLog(map, process_address, log);
  }

  m_dematerializer_wp = ret;

  return ret;
}

Status PlatformAppleSimulator::DisconnectRemote() {
#if defined(__APPLE__)
  m_device.reset();
  return Status();
#else
  Status err;
  err.SetErrorString(UNSUPPORTED_ERROR);
  return err;
#endif
}

Status ProcessFreeBSD::DisableWatchpoint(Watchpoint *wp, bool notify) {
  Status error;
  if (wp) {
    user_id_t watchID = wp->GetID();
    addr_t addr = wp->GetLoadAddress();
    Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
    if (log)
      log->Printf("ProcessFreeBSD::DisableWatchpoint(watchID = %" PRIu64 ")",
                  watchID);
    if (!wp->IsEnabled()) {
      if (log)
        log->Printf("ProcessFreeBSD::DisableWatchpoint(watchID = %" PRIu64
                    ") addr = 0x%8.8" PRIx64 ": watchpoint already disabled.",
                    watchID, (uint64_t)addr);
      // This is needed (for now) to keep watchpoints disabled correctly
      wp->SetEnabled(false, notify);
      return error;
    }

    if (wp->IsHardware()) {
      bool wp_disabled = true;
      std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
      uint32_t thread_count = m_thread_list.GetSize(false);
      for (uint32_t i = 0; i < thread_count; ++i) {
        FreeBSDThread *thread = static_cast<FreeBSDThread *>(
            m_thread_list.GetThreadAtIndex(i, false).get());
        if (thread)
          wp_disabled &= thread->DisableHardwareWatchpoint(wp);
        else
          wp_disabled = false;
      }
      if (wp_disabled) {
        wp->SetHardwareIndex(LLDB_INVALID_INDEX32);
        wp->SetEnabled(false, notify);
        return error;
      } else
        error.SetErrorString("Disabling hardware watchpoint failed");
    }
  } else
    error.SetErrorString("Watchpoint argument was NULL.");
  return error;
}

Status NativeRegisterContextLinux_mips64::ReadAllRegisterValues(
    lldb::DataBufferSP &data_sp) {
  Status error;

  data_sp.reset(new DataBufferHeap(REG_CONTEXT_SIZE, 0));
  if (!data_sp) {
    error.SetErrorStringWithFormat(
        "failed to allocate DataBufferHeap instance of size %" PRIu64,
        REG_CONTEXT_SIZE);
    return error;
  }

  error = ReadGPR();
  if (!error.Success()) {
    error.SetErrorString("ReadGPR() failed");
    return error;
  }

  error = ReadCP1();
  if (!error.Success()) {
    error.SetErrorString("ReadCP1() failed");
    return error;
  }

  uint8_t *dst = data_sp->GetBytes();
  if (dst == nullptr) {
    error.SetErrorStringWithFormat("DataBufferHeap instance of size %" PRIu64
                                   " returned a null pointer",
                                   REG_CONTEXT_SIZE);
    return error;
  }

  ::memcpy(dst, &m_gpr, GetRegisterInfoInterface().GetGPRSize());
  dst += GetRegisterInfoInterface().GetGPRSize();

  ::memcpy(dst, &m_fpr, GetFPRSize());
  dst += GetFPRSize();

  ::memcpy(dst, &m_msa, sizeof(MSA_linux_mips));

  return error;
}