This tool lists all macros in the indexed codebase.
% mx-list-macros --db /tmp/test.db
1152921504606847012 2305843009213693953 17926578318895742976 EnumAttrInt
1152921504606846997 2305843009214742980 13314892298794827776 _GLIBCXX_NOEXCEPT_IF
1152921504606847010 2305843009214743153 13314892298976231424 ABSL_CORD_INTERNAL_NO_SANITIZE
1152921504606847010 2305843009214743154 13314892298977280000 assert
...The format of the output is:
<file_id> <fragment_id> <macro_id> <name>
Adding --show_locations shows source locations for everything.