e02ccab4c0
Soundness gate for self-hosting (jolt-d0r). stage1 = analyzer built by the Janet bootstrap; stage2 = analyzer rebuilt by compiling jolt.ir + jolt.analyzer through stage1 (self-host); stage3 = the same self-rebuild again. A corpus of programs must produce identical results across all three. Compared BEHAVIORALLY rather than by emitted code: emitted Janet forms embed live setter/getter closures (identity varies per compile) and the IR carries representation-level gensyms and pvec internals, so structural equality fights the representation. Behavioral parity is the property that actually matters and is representation-independent. Also corrects the battery baseline 3920 -> 3919: 3920 was a lucky run; 3919 is the stable value (the 9 timeout-prone tests can shift the count by one).
81 lines
3.4 KiB
Text
81 lines
3.4 KiB
Text
# Bootstrap fixpoint (jolt-d0r).
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#
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# Soundness gate for self-hosting: the self-hosted compiler, rebuilt by compiling
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# its OWN source through itself (stage2), must behave identically to the compiler
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# built by the Janet bootstrap (stage1). We test this BEHAVIORALLY — run a corpus
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# of programs through each stage and compare results — rather than by comparing
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# emitted code, because emitted forms embed live setter/getter closures and the IR
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# carries representation-level gensyms; behavioral parity is the property that
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# actually matters and is representation-independent.
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#
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# stage1 = analyzer as built by the bootstrap.
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# stage2 = analyzer rebuilt by compiling jolt.ir + jolt.analyzer through stage1
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# (self-host, the fractal turn) and installing the result over itself.
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# stage3 = the same self-rebuild applied again, on top of stage2.
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# All three must produce identical results on the corpus.
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(use ../../src/jolt/types)
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(use ../../src/jolt/api)
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(use ../../src/jolt/reader)
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(import ../../src/jolt/backend :as be)
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(import ../../src/jolt/stdlib_embed :as se)
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(defn- forms [src]
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(var s src) (def fs @[])
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(while (> (length (string/trim s)) 0)
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(def p (parse-next s)) (set s (p 1))
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(when (p 0) (array/push fs (p 0))))
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fs)
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# Programs exercising the compiled constructs (fn/multi-arity/recur/loop/if/let/
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# map+vector literals/closures/higher-order/protocol dispatch). Each is a single
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# expression evaluated through the compile pipeline; we compare printed results.
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(def corpus
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["(let [f (fn [x] (* x x))] (map f [1 2 3 4]))"
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"(loop [i 0 acc 0] (if (< i 10) (recur (inc i) (+ acc i)) acc))"
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"((fn fact [n] (if (zero? n) 1 (* n (fact (dec n))))) 6)"
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"(reduce + 0 (filter even? (range 20)))"
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"(let [[a b & r] [1 2 3 4 5]] [a b r])"
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"(mapv (juxt identity inc dec) [10 20])"
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"(frequencies (concat [:a :a] [:b]))"
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"(group-by odd? (range 8))"
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"(get-in {:a {:b {:c 42}}} [:a :b :c])"
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"(first {:x 1})"
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"(into {} (map (fn [k] [k (* k k)]) (range 5)))"
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"((comp inc inc) 10)"
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"(apply max [3 1 4 1 5 9 2 6])"
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"(str (reverse \"hello\") (count [1 2 3]))"
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"(let [m {:a 1}] (assoc m :b (+ (:a m) 1)))"])
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(defn- run-corpus [ctx]
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(map (fn [p] (def r (protect (eval-string ctx p)))
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(if (r 0) (string/format "%j" (normalize-pvecs (r 1))) (string "ERR:" (r 1))))
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corpus))
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# Rebuild the analyzer through the self-hosted pipeline, in place.
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(defn- self-rebuild! [ctx]
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(def saved (ctx-current-ns ctx))
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(each nsn ["jolt.ir" "jolt.analyzer"]
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(ctx-set-current-ns ctx nsn)
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(each f (forms (get se/sources nsn)) (protect (be/compile-and-eval ctx f))))
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(ctx-set-current-ns ctx saved))
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(def ctx (init {:compile? true}))
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(def r1 (run-corpus ctx)) # stage1 (bootstrap-built)
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(self-rebuild! ctx)
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(def r2 (run-corpus ctx)) # stage2 (self-built)
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(self-rebuild! ctx)
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(def r3 (run-corpus ctx)) # stage3 (self-built from stage2)
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(var failures 0)
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(for i 0 (length corpus)
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(unless (and (= (r1 i) (r2 i)) (= (r2 i) (r3 i)))
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(++ failures)
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(printf "FAIL [%s]\n stage1=%s\n stage2=%s\n stage3=%s" (corpus i) (r1 i) (r2 i) (r3 i)))
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# also guard against everything silently erroring
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(when (string/has-prefix? "ERR:" (r1 i))
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(++ failures) (printf "FAIL [%s] stage1 errored: %s" (corpus i) (r1 i))))
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(if (pos? failures)
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(do (printf "bootstrap-fixpoint: %d failure(s)" failures) (os/exit 1))
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(printf "bootstrap-fixpoint: stage1 == stage2 == stage3 on %d programs\n" (length corpus)))
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