6ab65a30e3
Shaking the ring-app example's real library stack out against jolt surfaced a
batch of divergences from JVM Clojure, the biggest being evaluation order.
backend_scheme: call and recur arguments were emitted as bare Scheme operands,
so Chez's unspecified (right-to-left) order won out. Clojure evaluates left to
right, which selmer's reader loop relies on: (recur (add-node ... rdr) (read-char
rdr)) consumed a char early and dropped the first chars of every {{tag}}. Bind
operands to fresh temps in a let* (only when two or more can have side effects,
so hot calls over locals/consts stay un-wrapped). emit-ordered already did this
for collection literals; generalize it.
host-contract: syntax-quote now resolves the alias part of a qualified symbol
(impl/foo -> clojure.tools.logging.impl/foo) instead of leaving it bare, which
limped along via short-name matching until two loaded namespaces (reitit.impl,
clojure.tools.logging.impl) shared the short name and it broke.
collections: key-hash masks with bitwise-and, not fxand — jolt-hash is set!-
decorated per type (records return their own hash) and Chez's equal-hash can be a
bignum, so a key's hash isn't always a fixnum.
seq: even?/odd? handle bignums (JVM accepts any integer; the fxand crashed).
records: Keyword/Symbol .sym/.getName/.toString (honeysql's :clj branch reads
(.sym k)); Throwable .getMessage/.toString over a Chez condition.
host-static: __register-class-ctor!/__register-class-statics! so a host shim
(reitit.trie-jolt) can mirror a Java class.
natives-str: String.intern returns the string.
sqlite: jdbc.core fetch/fetch-one kebab-case column keys (the jolt-lang/db
convention; created_at -> :created-at).
io: a relative io/file path resolves against JOLT_PWD (the user's cwd), not the
repo root the launcher cd'd to — matches JVM cwd semantics, so config.edn loads.
cli: render an uncaught jolt throw (ex-info message + ex-data, or a condition)
instead of Chez's opaque "non-condition value" dump.
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|---|---|---|
| .. | ||
| image.ss | ||
| prelude.ss | ||
| README.md | ||
Chez bootstrap seed
These two files are the bootstrap compiler for jolt-on-Chez — the seed that makes the build self-hosting with no Janet in the loop:
prelude.ss— theclojure.coreprelude (all tiers + clojure.string/walk/ template/edn/set/pprint) as Schemedef-var!forms.image.ss— the compiler image (jolt.ir+jolt.analyzer+jolt.backend-scheme) as Schemedef-var!forms.
Both are generated, not hand-written. They are checked in because a fresh
checkout must be able to build jolt-on-Chez using only Chez: host/chez/bootstrap.ss
loads this seed, then rebuilds the prelude + image from the .clj/.ss sources via
the on-Chez compiler (read → analyze → emit, all on Chez). The seed is a joint
byte-fixpoint: rebuilding from an up-to-date seed reproduces it exactly.
make selfhost (host/chez/selfcheck.sh) runs host/chez/bootstrap.ss and diffs
the rebuilt artifacts against the checked-in seed.
Re-minting
When the seed sources change (the core tiers, the compiler namespaces, the host
contract, the reader, emit-image.ss), the seed drifts and make selfhost
fails. Re-mint it by running host/chez/bootstrap.ss and writing the freshly
rebuilt prelude/image back to host/chez/seed/prelude.ss /
host/chez/seed/image.ss, then commit the refreshed files.