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Clojure stack traces via source registry + native frame walk

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A direct-link build emits (jolt-register-source! short-name ns name file line)
once per fn def — at definition time, so zero per-call cost. On an uncaught
error the reporter walks Chez's native continuation frames (jolt-throw captures
the live continuation via call/cc; host conditions carry their own
&continuation), maps each frame's procedure name through the registry, and
prints a Clojure backtrace 'ns/name (file:line)'. Wired into both the cli and a
built binary's launcher.

Frames are keyed by the short munged fn name Chez actually reports (emit-fn's
letrec self-binding), not jv$ns$name; a cross-namespace collision degrades to
the bare frame name rather than a wrong attribution. The analyzer carries the
original form's position through defn macroexpansion onto the def node.

Calling a non-fn now throws a catchable ClassCastException (via jolt-throw)
naming the operator, instead of a raw Chez error.

Caveats (documented in source-registry.ss): names map only in direct-link/AOT
closed-world builds — the open-world -e/repl/run path falls back to the
top-level location; and pervasive TCO erases tail-call frames, so a mapped
trace shows only the non-tail spine. JOLT_DEBUG_FRAMES dumps raw frame names.

Re-mint (analyzer + backend); prelude byte-identical (direct-link off during
mint). Corpus rows certified, build-smoke asserts the trace.
This commit is contained in:
Yogthos 2026-06-25 21:49:11 -04:00
parent 9bf3d1c80e
commit 57bab5d409
12 changed files with 288 additions and 105 deletions
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2
test/chez/corpus.edn
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@ -611,6 +611,8 @@
{:suite "host-interop / class tokens & readers" :label "indexOf int needle is a char code" :expected "1" :actual "(.indexOf \"a=b\" 61)"}
{:suite "host-interop / exception + HashMap shims" :label "getMessage on a thrown string" :expected "\"class java.lang.String cannot be cast to class java.lang.Throwable (java.lang.String and java.lang.Throwable are in module java.base of loader 'bootstrap')\"" :actual "(try (throw \"boom\") (catch Throwable e (.getMessage e)))"}
{:suite "host-interop / exception + HashMap shims" :label "getMessage on ex-info" :expected "\"bad\"" :actual "(try (throw (ex-info \"bad\" {})) (catch Throwable e (.getMessage e)))"}
{:suite "host-interop / exception + HashMap shims" :label "calling a non-fn throws ClassCastException" :expected ":ccx" :actual "(try (1 2) (catch ClassCastException _ :ccx))"}
{:suite "host-interop / exception + HashMap shims" :label "non-fn cast is a RuntimeException too" :expected ":rt" :actual "(try ((identity 5)) (catch RuntimeException _ :rt))"}
{:suite "host-interop / exception + HashMap shims" :label "HashMap get" :expected "2" :actual "(let [m (HashMap. {:a 1 :b 2})] (.get m :b))"}
{:suite "host-interop / exception + HashMap shims" :label "HashMap put + size" :expected "2" :actual "(let [m (HashMap. {})] (.put m :x 1) (.put m :y 2) (.size m))"}
{:suite "host-interop / reader-feature toggle" :label "features default to jolt+default" :expected "true" :actual "(contains? (set (__reader-features)) \"jolt\")"}