Suppose that we have bit fields struct like this:

struct PartInfo
  unsigned int day:5;
  unsigned int month:4;
  unsigned int year:7;  // year <= 99
  unsigned int lot_no:11;  // lot_no <= 2000
  unsigned int part_id:5;  // part_id <= 30

How can I represent it in IDA?

  • Does its official documentation help?
    – Jongware
    May 3, 2020 at 9:46
  • @usr2564301 What about year field and lot_no field? It does not make sense to define all these value in enum.
    – OShadow
    May 3, 2020 at 10:45

1 Answer 1


You can add a struct with bitfields to the Local Types list (Shift-F1, Ins) but they are not currently supported by the decompiler or on the disassembly level.

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