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Chez Phase 1 (increment 3e): throw/try/catch/finally + ex-info

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Emit :throw as jolt-throw (Scheme raise of the raw jolt value, matching the
Janet compiled back end's (error v) — no envelope, so catch binds it directly).
Emit :try as guard (catch; the class is dropped in the IR, so it's catch-all)
plus dynamic-wind for finally. ex-info is a native-op building the tagged jolt
map {:jolt/type :jolt/ex-info :message :data :cause}, so the ex-data/ex-message/
ex-cause tier fns read it over jolt-get for free.

Prelude emit reach 303 -> 334/355 (:throw and :try gaps close). Subset probe
619 -> 632/632 compiled, 0 divergences (throw/try/ex-info pull 13 corpus cases
into the subset). emit-test 94/94 (added 11 throw/try/ex-info cases + uncaught
exits non-zero). Full gate green.
This commit is contained in:
Yogthos 2026-06-17 17:10:38 -04:00
parent 8f26433469
commit ffa122440a
5 changed files with 87 additions and 12 deletions
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host/chez/rt.ss
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@ -20,6 +20,25 @@
;; jolt `not`: only nil and false are falsey.
(define (jolt-not x) (if (jolt-truthy? x) #f #t))
;; --- exceptions (jolt-vcsl) --------------------------------------------------
;; throw raises the jolt value RAW (no envelope), like the Janet compiled back
;; end; catch (emitted as `guard`) binds it directly. Chez `raise` accepts any
;; object, so a thrown number/map/ex-info all work; uncaught -> non-zero exit.
(define (jolt-throw v) (raise v))
;; ex-info builds the tagged map {:jolt/type :jolt/ex-info :message :data :cause}
;; — a real jolt-hash-map, so the ex-data/ex-message/ex-cause tier fns read it
;; via jolt-get for free. Arity 2 (msg data) or 3 (msg data cause).
(define jolt-kw-ex-type (keyword "jolt" "type"))
(define jolt-kw-ex-info (keyword "jolt" "ex-info"))
(define jolt-kw-message (keyword #f "message"))
(define jolt-kw-data (keyword #f "data"))
(define jolt-kw-cause (keyword #f "cause"))
(define (jolt-ex-info msg data . more)
(jolt-hash-map jolt-kw-ex-type jolt-kw-ex-info
jolt-kw-message msg
jolt-kw-data data
jolt-kw-cause (if (null? more) jolt-nil (car more))))
;; --- var cells: late-bound global roots (Clojure vars) -----------------------
;; A var is a mutable cell keyed by "ns/name". A `:def` sets the root; a `:var`
;; reference reads it at use time (late binding), so a forward/mutually-recursive