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jolt/host/chez/seed
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Dmitri Sotnikov f124701393
Infer monomorphic protocol-method return types (#234) 
A protocol method whose impls all return the same record type has a monomorphic
return. collect-pm-rets! scans the unit's (register-(inline-)method ..) forms,
infers each impl fn's return type, and joins them per method; call-ret-type then
types a (method recv ..) call as that record, so a field read off the result
bare-indexes — e.g. (:ray (scatter m ..)) reads off a Ray. A disagreeing impl
joins to :any and keeps the generic path.

run-protoret.ss: a method with all-record impls bare-indexes + unboxes the field
read; a mixed-return method (one impl returns a number) stays generic. make test /
shakesmoke green, selfhost holds, 0 new divergences.

Foundation for auto-typing record values that flow through protocol dispatch. Does
not yet move the ray tracer: its scatter returns ScatterResult-or-nil (Metal
absorbs some rays), and the nil widens the join to :any — typing a nullable return
soundly needs flow-sensitive narrowing (a guarded (some? x) proves non-nil), filed
separately.

Co-authored-by: Yogthos <yogthos@gmail.com>
2026-06-26 16:59:35 +00:00
..
image.ss Infer monomorphic protocol-method return types (#234) 2026-06-26 16:59:35 +00:00
prelude.ss See through or/and in truthy-elision (#224) 2026-06-26 06:11:35 +00:00
README.md Docs: Chez-only, drop the Janet-era references and obsolete migration notes 2026-06-22 09:05:35 -04:00

README.md

Chez bootstrap seed

These two files are the bootstrap compiler for jolt — the seed that makes the build self-hosting:

  • prelude.ss — the clojure.core prelude (all tiers + clojure.string/walk/ template/edn/set/pprint) as Scheme def-var! forms.
  • image.ss — the compiler image (jolt.ir + jolt.analyzer + jolt.backend-scheme) as Scheme def-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.