simon/jolt

History

Yogthos d0e1a11934 Checked narrow casts; fix runtime require in self-contained-built binaries byte/short/int/long/char silently wrapped or passed out-of-range values through; the JVM range-checks (RT.byteCast family). One checked-cast helper now carries the ranges: a double range-checks ITSELF before truncating ((byte 1.1) is 1, (byte 127.000001) throws), NaN casts to 0, ratios and bigdecs truncate, a non-number is CCE, and the throw carries the JVM message. float range-checks against Float/MAX_VALUE. The unchecked-* casts now genuinely wrap and sign-fold ((unchecked-byte 200) is -56 — the old bit-and lost the sign) with doubles saturating like Java's conversions; unchecked-long/int are host natives. double/float of a bigdec convert instead of crashing. The no-single-float residue stays accepted (SPEC.md). Also fixes #290: a binary built by the SELF-CONTAINED joltc died with 'variable var-deref is not bound' when a namespace loaded at runtime. The in-process build compiled flat.ss against a clean copy-environment, which orphans every top-level define in locations the binary's runtime eval can't see. It now compiles against the default interaction environment (defines land in the real symbol cells, same as the legacy fresh-Chez path) and a generated prologue pre-binds each kernel name the runtime redefines to its kernel value, so the earliest boot reads match the legacy path's primitive references. requiring-resolve is implemented (the issue's dynamic-require pattern), and the release workflow smokes a runtime require in a built binary. Cast namespaces byte/short/int/long/char now fully clean; cts baseline 5805 -> 5857 pass, 67 baselined namespaces. 7 JVM-certified corpus rows.		2026-07-02 09:42:06 -04:00
..
certify.clj	Clean up codebase: rename stdlib layer, strip porting residue, fix tooling	2026-06-22 22:18:00 -04:00
known-divergences.edn	Numbers-style category dispatch for binary numeric ops	2026-07-02 06:41:45 -04:00
profile.edn	Clean up codebase: rename stdlib layer, strip porting residue, fix tooling	2026-06-22 22:18:00 -04:00
README.md	Clean up codebase: rename stdlib layer, strip porting residue, fix tooling	2026-06-22 22:18:00 -04:00
regen-corpus.clj	Clean up codebase: rename stdlib layer, strip porting residue, fix tooling	2026-06-22 22:18:00 -04:00
SPEC.md	Checked narrow casts; fix runtime require in self-contained-built binaries	2026-07-02 09:42:06 -04:00

README.md

Conformance: certifying the corpus against reference Clojure

See SPEC.md for the full host-neutral language-spec contract: the corpus schema, conformance levels, the feature profile, and how to host jolt on a new runtime. This README covers the certification tooling specifically.

The corpus (test/chez/corpus.edn) is jolt's host-neutral behavioral suite — one row per case: {:suite :label :expected :actual}, where :actual is a Clojure source expression and :expected its result (or :throws). The runtime harness (host/chez/run-corpus.ss, invoked by make corpus) replays it on Chez and compares by value-equality.

Every :expected is sourced from reference JVM Clojure, so the corpus is both a regression suite and a specification certified against Clojure rather than against its authors' beliefs. This directory holds the certification tooling that closes that gap.

What's here

certify.clj — runs every corpus row's :actual and :expected through reference JVM Clojure (each in a fresh user namespace, output/stdin sunk, a 5s per-case watchdog) and compares with Clojure's =. It buckets each row:
- certified / certified-throws — jolt's :expected matches real Clojure
- divergent — both evaluate but jolt's :expected disagrees with Clojure
- throws-mismatch — jolt and Clojure disagree on whether it throws
- jvm-error — :actual isn't runnable on vanilla Clojure (host-coupled / jolt-specific) — informational, not certifiable
- read-error / timeout — won't read on the JVM reader, or ran too long
known-divergences.edn — every current divergence, classified. Most are deliberate jolt-specific or host-model deltas (see :legend): the all-double numeric model, snapshot-heap concurrency, the no-JVM host model, jolt reader features, the jolt printer, intentional strictness. A few are genuine :bug entries with a tracked bead. These categories become the :features flags in conformance inc3.

make certify is the gate wrapper. It skips cleanly when clojure (JVM) is not installed; otherwise it runs certify.clj and fails the build on a NEW (unclassified) divergence or a stale allowlist entry. Flaky entries (JVM result is timing-dependent, e.g. future-cancel) are tolerated either way.

Running

make certify                                                 # the gate wrapper (skips if clojure absent)
clojure -M test/conformance/certify.clj                      # gate directly (exit≠0 on new/stale)
clojure -M test/conformance/certify.clj test/chez/corpus.edn --edn /tmp/report.edn  # full machine-readable report

Current state

Of ~2740 vanilla-certifiable rows, >2730 match reference Clojure exactly; the handful of divergences are all classified (deliberate deltas plus a few tracked bugs). The corpus is trustworthy as a spec, with the host-specific deltas made explicit rather than hidden.

Adding / changing cases

When you add corpus rows or change behavior, re-run the certifier. A NEW divergence means either a real bug (file it, tag the allowlist entry :bug + :bead) or a deliberate delta (classify it). A stale entry means a divergence was fixed — remove it from known-divergences.edn.