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jolt/test/chez
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Yogthos fe3fdf6b9c Transients: mutable backing instead of copy-on-write 
The Chez port had landed transients as copy-on-write — each conj!/assoc!/etc.
rebuilt the whole persistent collection. Semantics were right but a transient
vector was O(n^2) to build (the persistent vector is a flat array, so every
conj! copied it); maps/sets were ~O(n log n) since the HAMT only path-copies.
This restores the Janet host's approach: true mutable backing, snapshot once on
persistent!.

  vec : a growable Scheme vector (capacity + fill count); conj!/pop! amortized
        O(1), persistent! hands off the buffer (exact fit) or trims once.
  map : a Chez hashtable keyed by key-hash/jolt= (value equality, nil-safe);
        persistent! folds it into a pmap.
  set : a Chez hashtable; persistent! folds into a pset.
  cow : fallback for anything else (e.g. a sorted coll) keeps the old
        copy-on-write path, preserving jolt's superset.

get/count/contains?/nth see through each representation. Building a 400k vector
went from minutes (quadratic) to ~50ms (linear). assoc! keeps the variadic
dangling-key nil-pad on both vectors and maps. test/chez/transient-test.ss pins
the invariants and the linear-time property; wired in as `make transient`.
2026-06-22 08:38:22 -04:00
..
bench-chez.ss Chez Phase 4: perf probe (test/chez/bench-chez.ss) 2026-06-20 14:30:36 -04:00
corpus.edn Typed-array identity + JVM flonum printing (Inc 3) 2026-06-21 22:36:14 -04:00
ffi-server-test.ss Make blocking socket FFI collect-safe; fix http-client temp-file race 2026-06-22 08:12:53 -04:00
README.md Docs + CI for the Chez-only substrate 2026-06-21 11:34:48 -04:00
transient-test.ss Transients: mutable backing instead of copy-on-write 2026-06-22 08:38:22 -04:00
unit.edn mutable deftype fields: (set! field val) in a method 2026-06-22 01:19:03 -04:00
values-test.ss Chez Phase 0c + 0a hardening: collections decision + value-model fixes 2026-06-17 13:10:19 -04:00

README.md

Chez test harness

The correctness gate for jolt. Pure Chez (+ Clojure for the JVM oracle), no Janet. Correctness is judged against the JVM-sourced conformance spec; the spec itself lives in test/conformance/ (see its SPEC.md). Run the whole gate with make test from the repo root.

The spec corpus

corpus.edn is the contract: ~2920 rows {:suite :label :expected :actual}, with :expected sourced from reference JVM Clojure by test/conformance/regen-corpus.clj. It is frozen (the canonical source) — add or change cases here, then re-source the answers with regen-corpus.clj and re-certify with test/conformance/certify.clj.

The gate runners (host/chez/)

  • run-corpus.ss — runs every corpus case through the spine (read → analyze → IR → emit → eval, all on Chez), comparing each result by value-equality against the JVM :expected. A known-fail allowlist covers cases jolt can't match because Chez has no JVM host (Java classes, arrays, BigDecimal, opaque host-object printers, …); the gate fails only on a NEW divergence or if the pass count drops below the floor.

    chez --script host/chez/run-corpus.ss
JOLT_CORPUS_LIMIT=200 …            # every-Nth stride, fast iteration
JOLT_CHEZ_ZJ_FLOOR=N …            # override the floor (default 2678)

  • run-unit.ss — host-specific unit cases (test/chez/unit.edn) that aren't in the JVM-portable corpus: dot-forms, java statics, io, reader, walk, vars/namespaces, refs. Each :expr is evaluated in-process and its printed value compared to a baked :expected (:throws asserts a raise).

  • selfcheck.sh — self-host fixpoint: bootstrap.ss rebuild byte-equals the checked-in seed (host/chez/seed/).

  • smoke.sh — real bin/joltc -e CLI smoke.

Other Chez tests

  • values-test.ss — the value model (nil/truthiness/collections). make values.
  • bench-chez.ss — compute bench through the pipeline (opt-in; not in the gate).

All runners assume chez on PATH.