7167af4830
A repl or nREPL session now turns tail-frame tracing on, so an uncaught error in evaluated/reloaded code shows a tail-frame backtrace with no JOLT_TRACE set. The REPL and nREPL catch errors themselves rather than going through the uncaught reporter, so they now print the history backtrace via a new jolt.host/backtrace- string (history-only — the live continuation in a REPL is just REPL machinery). Because the recording is baked in at compile time, only code compiled while a session is live is traced; reload a namespace to trace already-loaded code. JOLT_TRACE=1 still forces it on for a whole run (a plain -M:run traces its own load); JOLT_TRACE=0 forces it off even in a session. No seed change — jolt.main/jolt.nrepl are runtime-loaded and compile-eval.ss / source-registry.ss are host files.
283 lines
16 KiB
Scheme
283 lines
16 KiB
Scheme
;; compile-eval.ss — the compile spine.
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;;
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;; Ties together the cross-compiled compiler image (jolt.ir + jolt.analyzer +
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;; jolt.backend-scheme, loaded as def-var! forms) and the host contract
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;; (host-contract.ss) into a runtime entry: a Clojure source string is read by the
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;; Chez data reader, analyzed by the analyzer to IR, emitted to Scheme by the
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;; emitter, and eval'd. This is the spine the stage2==stage3 bootstrap fixpoint
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;; closes over.
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;;
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;; Loaded after host-contract.ss + the compiler image.
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(define jolt-ce-analyze (var-deref "jolt.analyzer" "analyze"))
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(define jolt-ce-emit (var-deref "jolt.backend-scheme" "emit"))
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;; jolt.passes/run-passes: const-fold every analyzed form, plus inline + type
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;; inference when the unit opted into direct-linking (jolt build --opt). Off that
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;; path it is a pure const-fold. Loaded from the compiler image (jolt.passes).
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(define jolt-ce-run-passes (var-deref "jolt.passes" "run-passes"))
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;; The compiler reads source as FORMS (set literals stay {:jolt/type :jolt/set},
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;; which the analyzer lowers) — the raw reader, not clojure.core/read-string,
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;; whose data conversion would turn those into real sets.
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(define jolt-ce-read jolt-read-form-raw)
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;; --- current source location ------------------------------------------------
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;; The position of the top-level form currently compiling/evaluating, so an
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;; uncaught error can report where it came from (cli.ss jolt-report-uncaught).
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;; Thread-local: a future/agent worker tracks its own form. Holds #f or a
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;; {:line :column :file?} position map (jolt.host/form-position's shape).
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;; Top-level granularity — one set per top-level form, nothing per call.
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(define jolt-current-source (make-thread-parameter #f))
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;; clojure.lang.Compiler/LINE and /COLUMN — derefable cells (Vars on the JVM)
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;; holding the line/column of the form being compiled. Macros read @Compiler/LINE
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;; as a fallback when &form carries no position (jolt's reader stamps :line on list
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;; forms, so this is rarely hit). Updated per top-level form, like *current-source*.
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(define compiler-line-cell (jolt-atom-new 0))
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(define compiler-column-cell (jolt-atom-new 0))
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;; clojure.lang.Compiler/specials — the JVM's special-form table (sym -> parser).
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;; tools.macro reads (keys Compiler/specials) to know which heads NOT to expand.
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;; Only the keys matter here; values are #t. The set matches Clojure 1.2/1.3.
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(define compiler-specials
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(let ((unq '("def" "loop*" "recur" "if" "case*" "let*" "letfn*" "do" "fn*"
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"quote" "var" "." "set!" "try" "monitor-enter" "monitor-exit"
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"throw" "new" "&" "catch" "finally" "reify*" "deftype*")))
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(fold-left (lambda (m s) (jolt-assoc1 m (jolt-symbol #f s) #t))
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(jolt-assoc1 (jolt-hash-map) (jolt-symbol "clojure.core" "import*") #t)
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unq)))
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;; clojure.lang.Compiler/demunge — reverse the name munging Clojure applies to
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;; build JVM class/method names, so "clojure.core$odd_QMARK_" -> clojure.core/odd?.
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;; clojure.spec.alpha's fn-sym uses it to recover a symbol from a fn's class name.
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;; Longest tokens first; a standalone _ is a hyphen; $ separates ns from name.
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(define demunge-token-map
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'(("_DOUBLEQUOTE_" . "\"") ("_SINGLEQUOTE_" . "'") ("_AMPERSAND_" . "&") ("_PERCENT_" . "%")
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("_LBRACE_" . "{") ("_RBRACE_" . "}") ("_LBRACK_" . "[") ("_RBRACK_" . "]")
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("_BSLASH_" . "\\") ("_TILDE_" . "~") ("_CIRCA_" . "@") ("_SHARP_" . "#") ("_BANG_" . "!")
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("_CARET_" . "^") ("_COLON_" . ":") ("_QMARK_" . "?") ("_SLASH_" . "/") ("_PLUS_" . "+")
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("_STAR_" . "*") ("_BAR_" . "|") ("_GT_" . ">") ("_LT_" . "<") ("_EQ_" . "=") ("_DOT_" . ".")))
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(define (compiler-demunge s)
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(let* ((s (if (string? s) s (jolt-str-render-one s)))
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(n (string-length s))
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(out (open-output-string)))
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(let loop ((i 0))
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(if (>= i n) (get-output-string out)
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(let ((tok (let scan ((ts demunge-token-map))
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(cond ((null? ts) #f)
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((let ((t (caar ts)))
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(and (<= (+ i (string-length t)) n)
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(string=? (substring s i (+ i (string-length t))) t)))
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(car ts))
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(else (scan (cdr ts)))))))
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(cond
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(tok (display (cdr tok) out) (loop (+ i (string-length (car tok)))))
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((char=? (string-ref s i) #\_) (write-char #\- out) (loop (+ i 1)))
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((char=? (string-ref s i) #\$) (write-char #\/ out) (loop (+ i 1)))
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(else (write-char (string-ref s i) out) (loop (+ i 1)))))))))
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(let ((members (list (cons "LINE" compiler-line-cell) (cons "COLUMN" compiler-column-cell)
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(cons "specials" compiler-specials)
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(cons "demunge" compiler-demunge))))
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(register-class-statics! "Compiler" members)
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(register-class-statics! "clojure.lang.Compiler" members))
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(define (jolt-enter-form! form)
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(let ((p (hc-form-position form)))
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(when (pmap? p)
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(jolt-current-source p)
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(let ((line (jolt-get p hc-kw-line jolt-nil)) (col (jolt-get p hc-kw-column jolt-nil)))
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(jolt-atom-val-set! compiler-line-cell (if (jolt-nil? line) 0 line))
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(jolt-atom-val-set! compiler-column-cell (if (jolt-nil? col) 0 col))))))
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;; "file:line:col" / "line:col" for the current form, or #f when none is set.
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(define (jolt-current-source-string)
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(let ((p (jolt-current-source)))
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(and (pmap? p)
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(let ((line (jolt-get p hc-kw-line jolt-nil))
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(col (jolt-get p hc-kw-column jolt-nil))
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(file (jolt-get p hc-kw-file jolt-nil)))
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(string-append
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(if (jolt-nil? file) "" (string-append file ":"))
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(if (jolt-nil? line) "?" (number->string line)) ":"
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(if (jolt-nil? col) "?" (number->string col)))))))
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;; The spine ALWAYS runs with the full clojure.core prelude loaded, so a clojure.*
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;; ref must lower to var-deref (resolved from the prelude), not trip the emitter's
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;; "unsupported stdlib fn (no core on Chez yet)" out-of-subset guard — that guard
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;; is only for the bare -e subset with no prelude. Turn prelude mode on once, here,
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;; so every analyze->emit on this spine sees the full core.
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((var-deref "jolt.backend-scheme" "set-prelude-mode!") #t)
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;; Cache resolved var cells per reference site in runtime-compiled code (the big
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;; win for libraries / REPL code). emit-image.ss turns this back off so the seed
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;; mint and AOT build stay byte-deterministic. Guarded: the flag is absent in an
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;; older seed during the first re-mint pass.
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(let ((scv (var-deref "jolt.backend-scheme" "set-var-cache!")))
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(when (procedure? scv) (scv #t)))
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;; Tail-frame history. Turning it on makes the emitter add a per-fn history push to
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;; every fn compiled AFTERWARD, and allocates this thread's ring. Suppressed when
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;; JOLT_TRACE is explicitly falsey, so JOLT_TRACE=0 disables it even in dev mode.
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(define (jolt-enable-trace!)
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(let ((e (getenv "JOLT_TRACE")))
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(unless (and e (member e '("0" "false" "no")))
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(let ((stf (var-deref "jolt.backend-scheme" "set-trace-frames!")))
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(when (procedure? stf) (stf #t)))
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(jolt-trace-enable!))))
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;; Exposed so the REPL / nREPL entrypoints (jolt.main, jolt.nrepl) can turn tracing
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;; on for REPL-driven development without the user setting JOLT_TRACE. Because the
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;; push is baked in at compile time, only code compiled after this call is traced —
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;; which is exactly the code you eval / reload in a live session.
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(def-var! "jolt.host" "enable-trace!" jolt-enable-trace!)
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;; Explicit opt-in for a whole run (JOLT_TRACE=1): enable at load, BEFORE any app
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;; namespace is compiled, so a plain `-M:run` traces the app's own code too.
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(let ((e (getenv "JOLT_TRACE")))
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(when (and e (not (member e '("0" "false" "no" "")))) (jolt-enable-trace!)))
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;; (with-meta sym m) -> sym, else x — an (ns ^:no-doc name …) yields the name with
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;; reader metadata as a with-meta form; strip it to read the bare ns symbol.
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(define (ce-unwrap-meta x)
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(if (and (cseq? x) (cseq-list? x))
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(let ((items (seq->list x)))
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(if (and (pair? items) (symbol-t? (car items))
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(string=? (symbol-t-name (car items)) "with-meta") (pair? (cdr items)))
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(cadr items) x))
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x))
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;; (quote X) -> X, else x — unwraps a quoted require spec.
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(define (ce-unquote x)
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(if (and (cseq? x) (cseq-list? x))
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(let ((items (seq->list x)))
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(if (and (pair? items) (symbol-t? (car items))
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(string=? (symbol-t-name (car items)) "quote") (pair? (cdr items)))
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(cadr items) x))
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x))
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;; Pre-register any (require ...)/(use ...) :as aliases under `ns` BEFORE analysis,
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;; so a qualified s/foo resolves while compiling (analysis precedes the runtime
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;; require). Walks the whole form (a require may be nested in a do/let).
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(define (ce-clause-require? cl) ; (:require ...) / (:use ...) ns clause
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(and (pair? cl) (keyword? (car cl))
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(let ((kn (keyword-t-name (car cl)))) (or (string=? kn "require") (string=? kn "use")))))
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(define (ce-scan-requires! form ns)
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(when (and (cseq? form) (cseq-list? form))
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(let ((items (seq->list form)))
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(when (pair? items)
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(let* ((h (car items)) (hn (and (symbol-t? h) (symbol-t-name h))))
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(cond
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;; (require spec...) / (use spec...) — specs are quoted
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((and hn (or (string=? hn "require") (string=? hn "use")))
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(for-each (lambda (a) (chez-register-spec! ns (ce-unquote a))) (cdr items)))
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;; (ns name (:require [a :as x]) ...) — clause specs are literal. Register
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;; the aliases under NAME (the ns being defined), not the passed `ns`:
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;; when a file is loaded its ns form compiles while (chez-current-ns) is
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;; still the requiring ns, so using `ns` would leak the loaded ns's
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;; aliases into its requirer and clobber a same-named alias there
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;; (rewrite-clj.zip.base's [node.protocols :as node] over the caller's node).
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((and hn (string=? hn "ns"))
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(let ((ns-name (if (and (pair? (cdr items)) (symbol-t? (ce-unwrap-meta (cadr items))))
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(symbol-t-name (ce-unwrap-meta (cadr items)))
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ns)))
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(for-each (lambda (clause)
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(when (and (cseq? clause) (cseq-list? clause))
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(let ((cl (seq->list clause)))
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(when (ce-clause-require? cl)
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(for-each (lambda (spec) (chez-register-spec! ns-name spec)) (cdr cl))))))
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(if (pair? (cdr items)) (cddr items) '()))))
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(else (for-each (lambda (x) (ce-scan-requires! x ns)) items))))))))
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;; Already-read FORM -> Scheme source string (analyze -> emit on Chez).
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;; `ns` is the compile namespace unqualified symbols resolve against.
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(define (jolt-analyze-emit-form form ns)
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(ce-scan-requires! form ns)
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(let* ((ctx (make-analyze-ctx ns))
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(ir (jolt-ce-run-passes (jolt-ce-analyze ctx form) ctx)))
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(jolt-ce-emit ir)))
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;; --- runtime defmacro -------------------------------------------------------
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;; Shared with emit-image.ss (loaded after this). A defmacro lowers to a def of
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;; its expander fn + a macro flag, exactly as the prelude emits build-time macros.
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;; Is `f` a (defmacro ...) / (definline ...) form?
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(define (ce-macro-form? f)
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(and (cseq? f) (cseq-list? f)
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(let ((items (seq->list f)))
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(and (pair? items) (symbol-t? (car items))
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(let ((h (symbol-t-name (car items))))
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(or (string=? h "defmacro") (string=? h "definline")))))))
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;; (defmacro NAME [docstring] [attr-map] params body...) -> (values "NAME" (fn ...)).
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;; Strips a leading docstring (native string) + attr-map (a non-symbol pmap), then
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;; re-heads the rest with `fn` so a destructured macro arglist desugars. Emits the
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;; BARE fn (the caller wraps it in def-var! + mark-macro!), never a (def NAME ...) —
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;; interning NAME would make require skip the real macro.
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(define (ce-defmacro->fn f)
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(let* ((items (seq->list f))
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(name-sym (cadr items))
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(after-name (cddr items))
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(a1 (if (and (pair? after-name) (string? (car after-name)))
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(cdr after-name) after-name))
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(after-meta (if (and (pair? a1) (pmap? (car a1)))
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(cdr a1) a1))
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(fn-sym (jolt-symbol #f "fn")))
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(values (symbol-t-name name-sym)
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(apply jolt-list (cons fn-sym after-meta)))))
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;; A bare top-level (do ...) form — head is the unqualified `do` symbol.
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(define (ce-top-do? form)
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(and (cseq? form) (cseq-list? form)
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(let ((h (seq-first form)))
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(and (symbol-t? h) (jolt-nil? (hc-sym-ns h))
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(string=? (symbol-t-name h) "do")))))
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;; Compile + eval ONE already-read form in compile ns `ns`; returns the value.
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;; A top-level (do ...) is UNROLLED — each subform compiled+eval'd in turn, like
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;; Clojure's top-level do — so a runtime defmacro/def in an earlier subform is
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;; visible (macro flag set, var interned) before a later subform is analyzed.
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;; a non-form VALUE (a function object, a BigDecimal, a reference type)
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;; self-evaluates, like eval on the JVM.
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(define (jolt-compile-eval-form form ns)
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(if (or (procedure? form) (jbigdec? form) (jolt-atom? form) (jolt-multifn? form))
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form
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(jolt-compile-eval-form* form ns)))
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(define (jolt-compile-eval-form* form ns)
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(cond
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;; thread the current ns: an earlier subform may switch it (ns/in-ns call
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;; set-chez-ns!), and the next subform must be ANALYZED in that ns so its defs
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;; land there and its refs resolve (cross-ns def/require in one program).
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((ce-top-do? form)
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(let loop ((fs (cdr (seq->list form))) (result jolt-nil) (cur ns))
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(if (null? fs)
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result
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(let ((r (jolt-compile-eval-form (car fs) cur)))
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(loop (cdr fs) r (chez-current-ns))))))
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;; defmacro is compiled like any other form — the analyzer lowers it to a def
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;; of the expander fn + (mark-macro! …) so subsequent forms expand it. One
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;; macro-expansion path (no separate spine interception).
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(else
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;; record this form's source location first, so a compile- or run-time error
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;; in it reports the right place.
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(jolt-enter-form! form)
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;; drop tail-frame history from earlier top-level forms, so an error's trace
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;; shows only this form's own call history (a no-op unless JOLT_TRACE is on).
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(jolt-trace-reset!)
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(eval (read (open-input-string (jolt-analyze-emit-form form ns)))
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(interaction-environment)))))
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;; Source string -> value (read one form, compile + eval on Chez, in the
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;; top-level environment where rt.ss's runtime procedures live).
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(define (jolt-compile-eval src ns)
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(jolt-compile-eval-form (jolt-ce-read src) ns))
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;; clojure.core/load-string: read every form from the source string and compile+
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;; eval each in the current ns, returning the last value (nil for blank input).
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(define (jolt-load-string s)
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(let loop ((src s) (result jolt-nil))
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(let ((pn (jolt-parse-next src)))
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(if (jolt-nil? pn)
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result
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(loop (jolt-nth pn 1)
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(jolt-compile-eval-form (jolt-nth pn 0) (chez-current-ns)))))))
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;; eval / load-string are FUNCTIONS on the spine (the compiler image is resident
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;; at runtime). eval takes an already-read FORM (e.g. from quote / list); it and
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;; load-string compile+eval in the current ns. eval is removed from the analyzer's
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;; special-symbol lists (host-contract.ss) so it resolves as an ordinary core var.
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(def-var! "clojure.core" "eval"
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(lambda (form) (jolt-compile-eval-form form (chez-current-ns))))
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(def-var! "clojure.core" "load-string" jolt-load-string)
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