Packed bool arrays aka bitsets/bitvectors support

[Nemoumbra]

I'm reversing a program that allocates a memory range where it stores its state flags.
Example use scenario:

pPVar2 = get_flags_ptr(&pGVar1->substruct);
pPVar2->flags[0x1cd] = pPVar2->flags[0x1cd] & 0xef;

I've assigned a custom type ProgramStateFlags to the variable pPVar2. This struct has fields for the size and the byte* pointer to the allocated memory zone flags. As you could have guessed, the flags are stored in the compressed form that optimizes the size.

---

I can now manually figure out what's going on here by

• converting the constant 0xef to 0b11101111, checking that it has a single bit set to false, that is, the bit with index 4 (right to left)
• evaluating 0x1cd * 8 + 4 == 0xE6C == 3692
• adding a pre comment saying disable FLAG[3692];

Is this the best option I've got? I was hoping for some bitvector/bitset types.

[Wall-AF]

Use an enum. E.g.:

enum xxxFlags {
   flg1=1,
   flg2=2,
   flg3=4,
   ...
   flg8=128
}