Calls hidden inside -define bodies were invisible: the extractor consumed
pp_define without walking the replacement, and macro use sites produced no
edges, so a call path routed through a macro (ejabberd's SQL upsert macros,
logging wrappers) was completely dark.
The macro's constant node now participates in the graph. The -define body's
calls are attributed to the MACRO — true exactly once, instead of a per-use
duplicate that would explode on logging macros — and each use site links
in: ?MACRO(...) with arguments emits a `calls` ref (inlined code joins the
call chain), a bare ?CONSTANT read emits `references` (answering "where is
this macro used" without polluting call paths). Compiler-predefined macros
(?MODULE, ?LINE, ?FUNCTION_NAME, ...) are excluded, macro-use arguments
keep walking so a call nested in ?assertEqual(ok, do_thing()) still
attributes to the enclosing function, and macro-to-macro chains connect.
Validated: node counts unchanged on cowboy/ejabberd/emqx; edges +26/+7.3K/
+42K with honest hub shapes (?T i18n, ?SLOG logging, ?QOS_1 protocol
constants); 40/40 sampled edges precise; +1.3s index cost on emqx's 2,273
files. The payoff chain on ejabberd: set_password_scram_t → ?SQL_UPSERT_T →
ejabberd_sql:sql_query_t — database writes through SQL macros now trace
end-to-end.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Colby McHenry
b8cfd6c397