57bab5d409
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.
66 lines
3.3 KiB
Scheme
66 lines
3.3 KiB
Scheme
;; cli.ss — the jolt runtime.
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;;
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;; Loads the checked-in seed (host/chez/seed/{prelude,image}.ss — the bootstrap
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;; compiler) and the spine, then either evaluates a -e expression or dispatches a
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;; CLI command (run/-M/repl/path/task) through jolt.main. The loader
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;; (loader.ss) turns `require` into real file loading off the source roots, so a
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;; multi-file project with deps.edn dependencies runs end to end.
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;;
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;; Run from the repo root (bin/joltc cd's there); the project dir is JOLT_PWD.
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(import (chezscheme))
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(define cli-args (cdr (command-line))) ; drop the script name
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(load "host/chez/rt.ss")
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(set-chez-ns! "clojure.core")
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(load "host/chez/seed/prelude.ss")
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(load "host/chez/post-prelude.ss")
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(set-chez-ns! "user")
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(load "host/chez/host-contract.ss")
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(load "host/chez/seed/image.ss")
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(load "host/chez/compile-eval.ss")
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(load "host/chez/png.ss") ; jolt.png — a baked namespace before the snapshot
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(load "host/chez/loader.ss")
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;; jolt.ffi host primitives (memory / library loading) load AFTER the loader's
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;; baked-ns snapshot, so a library's (require '[jolt.ffi]) still loads jolt.ffi's
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;; Clojure side (the foreign-fn / defcfn macros, stdlib/jolt/ffi.clj).
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(load "host/chez/java/ffi.ss") ; jolt.ffi (FFI: a library binds native code)
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;; jolt.main + jolt.deps live under jolt-core; keep them (and stdlib) on the
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;; roots so the CLI's own namespaces — and any jolt.* an app pulls in — resolve.
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;; A project's resolved deps roots are prepended to these by jolt.main.
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(set-source-roots! (list "jolt-core" "stdlib"))
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;; Render an uncaught jolt throw (any value, not just a Chez condition) to stderr
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;; and exit non-zero, instead of Chez's opaque "non-condition value" dump. The
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;; message/ex-data/cause + a mapped Clojure backtrace come from the shared
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;; renderer (source-registry.ss); the cli adds the top-level source location.
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(define (jolt-report-uncaught v)
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(let ((port (current-error-port)))
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(jolt-render-throwable v port)
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;; The top-level form that was evaluating when this propagated (file:line:col).
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(let ((loc (jolt-current-source-string)))
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(when loc (display " at " port) (display loc port) (newline port)))
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(let ((bt (jolt-backtrace-string v)))
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(when bt (display " trace:\n" port) (display bt port)))
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(exit 1)))
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(guard (v (#t (jolt-report-uncaught v)))
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(cond
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;; -e EXPR — evaluate one expression and print it (blank for nil). Wrapped in
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;; (do …) so a multi-form string evaluates every form and returns the last.
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((and (= (length cli-args) 2) (string=? (car cli-args) "-e"))
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(let ((result (jolt-final-str
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(jolt-compile-eval (string-append "(do " (cadr cli-args) ")") "user"))))
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(unless (string=? result "")
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(display result) (newline))))
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;; otherwise dispatch the argv through jolt.main/-main
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(else
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;; `build` AOT-compiles an app to a standalone binary — load the build
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;; driver (the cross-compiler emitter) on demand so a normal run never pays
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;; for it. It defines jolt.host/build-binary, which jolt.main's build cmd calls.
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(when (and (pair? cli-args) (string=? (car cli-args) "build"))
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(load "host/chez/build.ss"))
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(load-namespace "jolt.main")
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(let ((mainv (var-deref "jolt.main" "-main")))
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(apply jolt-invoke mainv cli-args)))))
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