simon/jolt

History

Yogthos 6aed4d01ae Whole-program param-type inference (closed world) Re-derive each app fn's param types from its call sites under --opt, so a record type flows across fn boundaries: a ctor's return reaches a callee param, and a typed vector's element reaches a HOF closure's param. The back end can then bare-index field reads and devirtualize protocol calls at those sites (it reads the resulting :hint/:devirt annotations; consuming them is separate work). This rebuilds the inter-procedural driver the Janet host had — the API (infer-body/reinfer-def) survived the rehost but nothing drove it, and the record-shapes/protocol-methods registries were empty stubs. - records.ss: populate record-shapes (ctor key -> fields/tags/type, resolving nested record field tags) and protocol-methods (method var -> [proto method]) registries at deftype/defprotocol load time; jolt.host accessors materialize them. - passes/types.clj: wp-infer! runs a closed-world fixpoint joining call-site arg types into callee params; reinfer-def re-seeds each def at emit. Self- recursive calls and fn-level recur are collected so a recursive fn's params are constrained by its recursion, not just external callers — else a param the recursion widens (e.g. binary-trees check-tree, whose untagged child can be nil) would be unsoundly typed non-nil. A fn used in value position keeps :any params (callers unknown). Megamorphic sites join to :any. - build.ss: analyze all app forms and run the fixpoint before per-form emit. - run-wp.ss: gate (cross-fn propagation, escape soundness, self-recursion). make test / shakesmoke green, 0 new divergences, selfhost holds.		2026-06-26 06:54:06 -04:00
..
image.ss	Whole-program param-type inference (closed world)	2026-06-26 06:54:06 -04:00
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.