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Infer monomorphic protocol-method return types (#234)

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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>
This commit is contained in:
Dmitri Sotnikov 2026-06-26 16:59:35 +00:00 • committed by GitHub
parent 8c9cba44b3
commit f124701393
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10
Makefile
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@ -4,7 +4,7 @@
# build step. `make test` is the full gate. `make remint` rebuilds the seed after a
# source change.
.PHONY: test ci values corpus unit smoke buildsmoke selfhost sci certify ffi transient infer wp devirt fieldread numwp fieldnum directlink numeric inline shakesmoke remint
.PHONY: test ci values corpus unit smoke buildsmoke selfhost sci certify ffi transient infer wp devirt fieldread numwp fieldnum protoret directlink numeric inline shakesmoke remint
# Full gate (dev machine). Includes the self-host byte-fixpoint, which only holds
# on the same Chez that minted the seed.
@ -15,7 +15,7 @@ test: selfhost ci
# lockfile) — it RUNS correctly on any Chez, but `selfhost` rebuilds it and a
# different Chez version may emit byte-different (gensym/order) output, so the
# byte-fixpoint is a dev-machine check, not a CI one (jolt-8479).
ci: values corpus unit smoke buildsmoke sci ffi transient infer wp devirt fieldread numwp fieldnum directlink numeric inline certify
ci: values corpus unit smoke buildsmoke sci ffi transient infer wp devirt fieldread numwp fieldnum protoret directlink numeric inline certify
@echo "OK: CI gates passed"
# Self-host fixpoint: bootstrap.ss rebuild == checked-in seed.
@ -92,6 +92,12 @@ numwp:
fieldnum:
@chez --script host/chez/run-fieldnum.ss
# Protocol-method return inference: a method whose impls all return the same record
# type has a monomorphic return, so a (method recv ..) call types as that record and
# a field read off the result bare-indexes; a disagreeing impl keeps the generic path.
protoret:
@chez --script host/chez/run-protoret.ss
# Direct-linking emission: a closed-world build binds top-level app defs to jv$
# Scheme bindings and routes app->app calls/refs to them, skipping var-deref +
# jolt-invoke; ^:dynamic/^:redef and nested defs opt out.