Примеры ошибок, обнаруженных с помощью диагностики V684

V684. Value of variable is not modified. It is possible that '1' should be present instead of '0'. Consider inspecting the expression.

V8 JavaScript Engine

V684 A value of the variable '* (cases - 1)' is not modified. Consider inspecting the expression. It is possible that '1' should be present instead of '0'. ucol.cpp 4941

U_CFUNC int32_t U_CALLCONV
ucol_calcSortKey(....)
{
  ....
  if((caseBits & 0xC0) == 0) {
    *(cases-1) |= 1 << (--caseShift);
  } else {
    *(cases-1) |= 0 << (--caseShift);
  ....
}

Similar errors can be found in some other places:

• V684 A value of the variable '* (cases - 1)' is not modified. Consider inspecting the expression. It is possible that '1' should be present instead of '0'. ucol.cpp 4948
• V684 A value of the variable 'caseByte' is not modified. Consider inspecting the expression. It is possible that '1' should be present instead of '0'. ucol.cpp 6201
• V684 A value of the variable 'caseByte' is not modified. Consider inspecting the expression. It is possible that '1' should be present instead of '0'. ucol.cpp 6212

Chromium

V684 A value of the variable 'flags' is not modified. Consider inspecting the expression. It is possible that '1' should be present instead of '0'. usb_device_handle_win.cc 58

uint8_t BuildRequestFlags(UsbTransferDirection direction,
                          UsbControlTransferType request_type,
                          UsbControlTransferRecipient recipient)
{
  uint8_t flags = 0;

  switch (direction) {
    case UsbTransferDirection::OUTBOUND:
      flags |= BMREQUEST_HOST_TO_DEVICE << 7;    // <=
      break;
    case UsbTransferDirection::INBOUND:
      flags |= BMREQUEST_DEVICE_TO_HOST << 7;
      break;
  }

  switch (request_type) {
    case UsbControlTransferType::STANDARD:
      flags |= BMREQUEST_STANDARD << 5;          // <=
      break;
    case UsbControlTransferType::CLASS:
      flags |= BMREQUEST_CLASS << 5;
      break;
    ....
  }
  ....
  return flags;
}

Similar errors can be found in some other places:

• V684 A value of the variable 'flags' is not modified. Consider inspecting the expression. It is possible that '1' should be present instead of '0'. usb_device_handle_win.cc 67