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Examples of errors detected by the V684…

Examples of errors detected by the V684 diagnostic

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

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