forked from Imagelibrary/binutils-gdb
cd8ea31666
There's one API addition here: the existing CTF_ADD_ROOT / CTF_ADD_NONROOT flags can have a new flag ORed with them, CTF_ADD_STRUCT_BITFIELDS, indicating that the newly-added struct/union is capable of having bitfields added to it via the new ctf_add_member_bitfield function (see a later commit). Without this, you can only add bitfields via the deprecated slice or base type encoding representations (the former will force CTF output). Implementation notes: structs and unions are always added with a CTF_K_BIG prefix: if promoting from a forward, one is added. These are elided at serialization time if they are not needed to encode this size of struct / this number of members. (This means you don't have to figure out in advance if your struct will be too big for BTF: you can just add members to it, and libctf will figure it out and upgrade the dict as needed, or tell you it can't if you've forbidden such things.) We take advantage of this to merge a couple of very similar functions, saving a bit of code.