- Split Analyzer.analyze/1 into compute_state/1 (slow, scans all BEAMs)
and a fast filter step. analyze/1 now accepts :precomputed_state opt.
- Mix.Tasks.Compile.Unused.run/1 picks up precomputed state from process
dict :mix_unused_extra_analyze_opts when present (test escape hatch).
- AnalyzerTest setup_all computes state once; exclude tests pass it
through analyze/1, dropping per-test cost from ~700ms to <1ms.
- UnusedTest setup_all does the same — the consolidated severity-args
test drops from 3.4s to ~5ms.
- Trim further sleeps in HistoricalLoadingTest (100->30ms) and
MovementTest (50->20ms, receive timeouts 100->30ms).
Total suite: 40.6s -> 37.7s; 2488 tests, 0 failures.
Adds a self-contained 'unused' Mix compiler task that finds public
functions in this project no caller in the project ever invokes:
- MixUnused.Analyzer: enumerates public functions across the project's
compiled BEAM files (filtered by app), walks the abstract code in
each BEAM via :beam_lib to collect every remote {Module, fun, arity}
call observed at compile time, and subtracts the call set from the
def set. Exposes :exclude (modules or MFA triples), :compile_path,
and :app options. Behaviour callbacks (@impl true and any listed
in behaviour_info(:callbacks)) and well-known entry points
(start_link, child_spec, mount, render, GenServer callbacks,
__info__, module_info, etc.) are excluded automatically.
- Mix.Tasks.Compile.Unused: a Mix.Task.Compiler that compiles the
project then asks the analyzer for unused defs. Severity is
configurable via the :unused project key; per-file exclusion of
test/ paths is on by default.
Inspired by https://github.com/hauleth/mix_unused — uses BEAM
introspection rather than a compilation tracer to avoid the
chicken-and-egg problem of recompiling the tracer module itself
during analysis.
