8f26433469
Add a prelude emit mode to host/chez/emit.janet: when emitting clojure.core itself (not user -e), a non-native clojure.core ref lowers to a runtime var-deref instead of being rejected as out-of-subset, so core fns chain through each other. Default (subset) mode is unchanged — the corpus probe still rejects unimplemented core refs for a clean signal. core-prelude-probe.janet walks the tiers through the live analyzer->emit pipeline and catalogs reach + gaps (macros skipped; analyze-time only). Baseline: 303/355 non-macro core forms emit. Remaining gaps are a tight punch-list for the next increments: :throw (29), :quote (8), :try (2), Java host interop (6), letfn (4), declare (2). Probe has a regression floor. emit-test 83/83 (added prelude-mode lowering assertions); subset probe 619/619 unchanged; full gate green.
93 lines
5.6 KiB
Markdown
93 lines
5.6 KiB
Markdown
# Chez port — Phase 0 test contract harness
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The host-neutral correctness gate for the Chez re-host (epic jolt-cf1q). The
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spec corpus is data, so the SAME contract validates every host.
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## Files
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- `extract-corpus.janet` — parses `test/spec/*.janet` `(defspec …)` tables as
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data and writes `corpus.edn` (2655 `[label expected actual]` cases). The file
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is valid as BOTH EDN (a future Chez-jolt runner) and Janet data (the runner
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below). Regenerate: `janet test/chez/extract-corpus.janet`.
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- `corpus.edn` — the extracted contract (generated; checked in for convenience).
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- `run-corpus.janet` — drives a TARGET jolt binary, one fresh subprocess per case
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(fresh ctx = per-case isolation), checking `(= expected actual)` prints `true`
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at the CLI, or that a `:throws` case exits non-zero. Pluggable target:
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- `janet test/chez/run-corpus.janet` # default build/jolt
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- `JOLT_BIN=build/jolt-chez janet test/chez/run-corpus.janet` # Phase 1+
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- `JOLT_CORPUS_LIMIT=400 …` # every-Nth stride, fast
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- `known-divergences.edn` — allowlist of cases that diverge at the CLI boundary.
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The gate fails only on a NEW divergence; known ones are reported but tolerated.
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- `values-test.ss` / `../../host/chez/values.ss` — Phase 0a value model + tests.
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## The reference baseline (2026-06-17, Janet `build/jolt`, compile mode)
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2641/2655 pass; 14 known divergences. They split into:
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- **interpret-vs-compile leniency** — `:throws` cases where interpret mode raises
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but compile mode returns (`< nil`, `> with nil`, `neg? keyword`, `max`/`min-key`
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on non-numbers). Several are also non-canonical vs JVM Clojure.
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- **invoke-collection-as-fn** — the `transient / invokable lookup` suite invokes
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transients/collections as fns (`((transient {:x 7}) :x)`); compile mode (and
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JVM Clojure) reject it.
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- **`xml-seq walks`** — one structural case.
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The compile-only Chez host (JVM-canonical oracle) should MATCH OR FIX these. The
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gate's job is to catch *regressions* the port introduces, not to bless these.
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## Why the CLI boundary
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The runner tests through `jolt -e`, exactly how the Chez host will be exercised —
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not the in-process `eval-string` the Janet `defspec` harness uses. The two differ
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on a handful of cases (the allowlist), and the CLI boundary is the portable one.
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## Phase 1 — first parity number (subset probe)
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The full `run-corpus.janet` gate drives an `-e`-capable jolt binary; the Chez
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host can't answer arbitrary `-e` until all of clojure.core is bootstrapped onto
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Chez (Phase 2). Until then, `run-corpus-chez.janet` reports parity for the subset
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the Phase-1 back end (`host/chez/emit.janet`) can already compile: each case is
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run through the live analyzer → Scheme emitter → Chez via `host/chez/driver`.
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Cases that reference unimplemented stdlib/host fns fail to EMIT (a clean
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compile-time signal) and are counted "out of subset", not as divergences.
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JOLT_CHEZ_CORPUS=1 janet test/chez/run-corpus-chez.janet
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Baseline after inc 3c (multi-arity + variadic fns, jolt-gret): **619/619 compiled
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cases pass**, 0 divergences; 2036/2655 out of subset (await clojure.core on Chez).
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`emit-fn` now lowers multi-arity fns to a Scheme `case-lambda` and variadic fns to
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a rest-arg lambda (the Scheme rest list is coerced to a jolt seq, nil when empty),
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which is the gating lift for emitting the clojure.core tiers as a prelude.
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## Phase 1 — clojure.core prelude emission (inc 3d, jolt-ocvi)
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The `-e`-capable jolt-chez path: emit the clojure.core tiers
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(`jolt-core/clojure/core/NN-*.clj`) through the same analyzer → emit pipeline as a
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Scheme PRELUDE of `def-var!` forms, so user code's `(var-deref "clojure.core" …)`
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resolves the fn at runtime. `emit/set-prelude-mode!` flips a switch: in the default
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(subset) mode a non-native `clojure.core` ref is rejected ("out of subset"); in
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prelude mode it lowers to a runtime `var-deref` so core fns chain through each
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other. Host interop (`:host`) and unhandled IR ops still error in both modes —
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those are the real gaps that need a hand-written RT shim or new emit support.
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`core-prelude-probe.janet` (gated behind `JOLT_CHEZ_PRELUDE=1`) measures reach and
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catalogs the gaps; macros are skipped (analyze-time only, not a runtime value):
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JOLT_CHEZ_PRELUDE=1 janet test/chez/core-prelude-probe.janet
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Baseline: **303/355 non-macro core forms emit** to Scheme. Remaining 52 gaps:
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`:throw` (29, the big one — needs an exception model), `:quote` (8, needs RT
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symbols/lists), `:try` (2), Java host interop `.write`/`.isDirectory` (6, io tier),
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`letfn` (4), `declare`/def-no-init (2), one edge (`parse-uuid`). Each is a clean
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next-increment target. The probe has a regression floor (raise it as gaps close).
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Prior, inc 3b (seq tier + dynamic IFn, jolt-5pso): 595/595 compiled, 0 divergences,
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2060/2655 out of subset. The seq tier brought up a list/lazy-seq type with
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first/rest/next/seq/cons/list, map/filter/reduce/into/remove,
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range/take/drop/concat/apply, keys/vals, and nth/peek/pop over seqs; dynamic IFn
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dispatch (a keyword/vector/coll held in a local and called as a fn) routes through
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the `jolt-invoke` fallback, closing the 3 ex-known divergences. The probe exits
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non-zero on any NEW divergence.
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(Prior, inc 3a: 433/436 compiled, 3 known IFn divergences, 2219 out of subset.
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Inc 2: 182/182 compiled, 0 divergences, 2473 out of subset.)
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It's a slow report (a Chez subprocess per case), so it's gated behind
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`JOLT_CHEZ_CORPUS` out of the default suite, like the benches.
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`test/chez/emit-test.janet` is the fast Phase-1 unit gate (real analyzer → Chez
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parity for fib/mandelbrot + collections + regressions); both skip cleanly when
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`chez` isn't on PATH.
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