32ef74b9b0
The persistent vector was a flat Scheme vector with copy-on-write: every conj copied the whole backing array, so building an n-element vector was O(n^2). On the collections bench that's vec-sum building 7500 elements with 227MB of copies, 90% of the bench's allocation. Replace it with Clojure's PersistentVector — a 32-way trie plus a trailing tail chunk. conj appends to the tail and, when it fills, path-copies it into the trie, so conj is O(1) amortized and a linear build is O(n). nth/assoc/pop are O(log32 n). make-pvec (build a trie from a flat vector) and pvec-v (materialize back) stay as compatibility shims, so the ~14 callers that read the backing array — all one-shot conversions in =, hash, seq, meta-copy, transients, the reader — are untouched; only this file's internals change. vec-sum 70ms/227MB -> 1ms/3MB; collections 10.4x -> 4.0x vs JVM, under the 5x target. 5 new corpus rows plus boundary stress (level transitions at 32 and 1024, pop-collapse, assoc at every index) cover the trie. Co-authored-by: Yogthos <yogthos@gmail.com> |
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|---|---|---|
| .. | ||
| build-app | ||
| bench-chez.ss | ||
| corpus.edn | ||
| directlink-test.ss | ||
| ffi-binding-test.ss | ||
| inline-test.ss | ||
| numeric-test.ss | ||
| README.md | ||
| transient-test.ss | ||
| unit.edn | ||
| values-test.ss | ||
Chez test harness
The correctness gate for jolt. Pure Chez (+ Clojure for the JVM oracle).
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. Aknown-failallowlist 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:expris evaluated in-process and its printed value compared to a baked:expected(:throwsasserts a raise). -
selfcheck.sh— self-host fixpoint:bootstrap.ssrebuild byte-equals the checked-in seed (host/chez/seed/). -
smoke.sh— realbin/joltc -eCLI 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.