3721423a64
A vector's seq is now a real chunked-seq (chunked-seq? true), matching Clojure/
CLJS. Each vector-seq cell carries its backing vector + element index as two
cseq fields (cvec/ci, no extra allocation vs the old lazy cell), so:
- chunk-first hands out a 32-element block (a pvec slice), chunk-rest is the
seq at the next block boundary — the ChunkedSeq contract (chunk-first ++
chunk-rest == the seq);
- reduce/transduce take a fast path that walks the backing vector by index in
a tight loop with no per-element seq cells (reduce over a 1M-vector ~0.4s).
The seq cell stays a cseq, so first/rest/count/printing and the ~26 cseq?
dispatch sites are untouched. The eager chunk-buffer model (chunk-buffer/chunk/
chunk-cons) is preserved for the round-trip case. No seed change (runtime only).
|
||
|---|---|---|
| .github/workflows | ||
| bench | ||
| bin | ||
| docs | ||
| host/chez | ||
| img | ||
| jolt-core | ||
| spike/chez | ||
| src/jolt | ||
| test | ||
| tools | ||
| vendor | ||
| .DS_Store | ||
| .gitignore | ||
| .gitmodules | ||
| AGENTS.md | ||
| CLAUDE.md | ||
| clojuredocs-export.edn | ||
| clojuredocs-export.json | ||
| foundational-runtime-handoff.md | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
Jolt
A Clojure implementation on Chez Scheme.
Jolt reads Clojure source, analyzes it to a host-neutral IR, emits Scheme, and
runs it on Chez. The compiler is self-hosted: it is written in Clojure
(jolt-core/) and compiles itself. It ships a Clojure-compatible standard library.
Requirements
Only Chez Scheme (the gate invokes it as
chez). The conformance gate additionally uses Clojure on the JVM as an oracle,
but running jolt does not.
Build
There is no build step. The bootstrap seed (host/chez/seed/{prelude,image}.ss)
is checked in, so a fresh clone runs immediately:
git clone --recurse-submodules https://github.com/jolt-lang/jolt.git
cd jolt
bin/joltc -e '(+ 1 2)' # => 3
After changing a compiler source — the reader (host/chez/reader.ss), the
analyzer/IR/backend (jolt-core/jolt/*.clj), or the clojure.core overlay
(jolt-core/clojure/core/*.clj) — re-mint the seed:
make remint # iterates host/chez/bootstrap.ss to a byte-fixpoint
Run
bin/joltc -e EXPR # evaluate a Clojure expression and print the result
$ bin/joltc -e '(->> (range 10) (filter even?) (map (fn [x] (* x x))) (reduce +))'
120
$ bin/joltc -e '(/ 1 2)'
1/2
Architecture
A small Chez runtime (host/chez/*.ss: value model, persistent collections, seqs,
vars/namespaces, host interop) hosts a portable Clojure overlay (jolt-core/): the
reader/analyzer/IR/backend (jolt-core/jolt/) and clojure.core in
dependency-ordered tiers (jolt-core/clojure/core/NN-*.clj). The stdlib namespaces
(clojure.string/set/walk/edn/pprint/…) are portable Clojure under
src/jolt/clojure/.
bin/joltc loads the checked-in seed and the spine, then compiles and evaluates on
Chez (read → analyze → IR → emit → eval). host/chez/bootstrap.ss rebuilds that
seed from source on pure Chez; the build is a self-hosting fixpoint (a rebuild
reproduces the checked-in seed byte-for-byte).
Differences from Clojure
Jolt targets Clojure semantics but runs on Chez, not the JVM.
- Host platform. No JVM and no Java interop —
import,gen-class,proxyof Java classes, andjava.*are unavailable. A class token resolves to a name; a small set of host classes is recognized forinstance?. - Numbers. The full Scheme numeric tower, matching the JVM: exact integers and
bignums, exact ratios (
(/ 1 2)⇒1/2), and flonum doubles.=is category-aware ((= 3 3.0)⇒false);==is value-equality ((== 3 3.0)⇒true).integer?/int?are exact integers,float?/double?are flonums,ratio?is an exact non-integer. NoBigDecimal(decimal?is always false). - Concurrency.
future/promise/agent/pmaprun on real OS threads over a shared heap, matching JVM semantics (not isolated-heap snapshots). Atoms use a per-atom mutex with JVM-style CAS.clojure.core.asyncprovides blocking channels andgo/<!/>!/alts!/timeout. - Regex. Backed by irregex (vendored), PCRE/Java-style patterns.
- Collections. Immutable persistent vectors (32-way tries), cons lists, and HAMT
maps/sets. Hash-map/hash-set iteration order is unspecified — use
sorted-map/sorted-setwhen order matters. Transients are real mutable scratch collections.
Supported and Clojure-compatible: lazy/infinite sequences, transducers,
destructuring, multimethods with hierarchies, protocols/records
(deftype/defrecord/reify/extend-protocol), metadata, namespaces, runtime
eval/load-string/defmacro, and the reader (#(), #_, #?, tagged literals,
#"…").
Test
make test # the full gate (no Janet)
make corpus # conformance corpus vs the JVM-sourced spec
make unit # host-specific unit cases
make selfhost # bootstrap fixpoint (rebuild == checked-in seed)
make smoke # bin/joltc CLI smoke
make sci # load borkdude/sci's source through joltc (compat stress)
make certify # JVM oracle (skips if clojure is absent)
The conformance corpus (test/chez/corpus.edn) is a host-neutral language spec
whose expected values are sourced from reference JVM Clojure. See
test/conformance/SPEC.md.