509c23f06d
The zero-Janet spine proves the on-Chez analyzer/emitter compile arbitrary Clojure faithfully. This proves the stronger property: the on-Chez compiler reproduces itself. emit-image.ss re-emits the compiler sources (jolt.ir + jolt.analyzer + jolt.backend-scheme) ON CHEZ via the loaded image; feeding it stage1 (the Janet cross-compile) yields stage2, feeding stage2 yields stage3. stage2 and stage3 are byte-for-byte identical, and stage2 is a working compiler (real cases compile+run through it). stage1 differs from stage2 only in gensym numbering, so the fixpoint is stage2==stage3. driver: emit-image-on-chez / program-emit-image spawn a fresh chez per stage (clean gensym state). test/chez/fixpoint-test.janet gates it (skips without chez).
109 lines
5 KiB
Text
109 lines
5 KiB
Text
# Chez Phase 3 inc8 (jolt-bzni) — the stage2==stage3 self-hosting fixpoint.
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#
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# The zero-Janet spine (spine-test / run-corpus-zero-janet) proves the ON-CHEZ
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# analyzer+emitter compile arbitrary Clojure faithfully. This proves the stronger
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# property from self-hosting-bootstrap-research §4: the on-Chez compiler reproduces
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# ITSELF. The compiler image (jolt.ir + jolt.analyzer + jolt.backend-scheme cross-
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# compiled to Scheme def-var! forms) is built three ways:
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#
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# stage1 = Janet analyzer/emitter cross-compiles the compiler sources
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# (driver/emit-compiler-image — the current bootstrap input)
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# stage2 = the ON-CHEZ compiler loaded from stage1 re-emits the same sources
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# (driver/emit-image-on-chez, host/chez/emit-image.ss)
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# stage3 = the ON-CHEZ compiler loaded from stage2 re-emits them again
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#
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# stage1 differs from stage2 only in gensym numbering (the Janet build allocates
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# more gensyms before reaching the compiler emit), so the fixpoint is stage2 vs
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# stage3: both are produced by Chez from a fresh process, so a byte-for-byte match
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# means the compiler has converged — it compiles its own source to itself. We also
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# run real compile+eval cases THROUGH stage2 to prove it's a working compiler, not
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# a degenerate one that just happens to be stable.
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#
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# janet test/chez/fixpoint-test.janet
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(import ../../host/chez/driver :as d)
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(import ../../host/chez/jolt-chez :as jc)
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(var total 0) (var fails 0)
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(defn ok [name pred &opt extra]
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(++ total)
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(if pred (printf "ok: %s" name)
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(do (++ fails) (printf "FAIL: %s %s" name (or extra "")))))
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(unless (d/chez-available?)
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(print "chez not on PATH — skipping fixpoint-test")
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(os/exit 0))
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(def ctx (d/make-ctx))
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(def prelude-path (jc/ensure-prelude ctx))
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# stage1: the Janet cross-compiled image, cached by source fingerprint (same scheme
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# as spine-test / run-corpus-zero-janet).
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(defn- image-fingerprint []
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(string/slice (string (hash (string/join
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(map slurp ["jolt-core/jolt/ir.clj" "jolt-core/jolt/analyzer.clj"
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"jolt-core/jolt/backend_scheme.clj" "host/chez/host-contract.ss"
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"host/chez/compile-eval.ss"])))) 0))
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(def tmp (or (os/getenv "TMPDIR") "/tmp"))
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(def stage1 (string tmp "/jolt-compiler-image-" (image-fingerprint) ".ss"))
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(def t0 (os/clock))
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(d/ensure-compiler-image ctx stage1)
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(printf "stage1 (Janet cross-compile): %d bytes (%.1fs)" (length (slurp stage1)) (- (os/clock) t0))
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(flush)
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# stage2 = on-Chez compiler (from stage1) re-emits the compiler. Fresh temp path so
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# it always regenerates.
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(def stage2 (string tmp "/jolt-fixpoint-stage2-" (os/getpid) ".ss"))
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(def stage3 (string tmp "/jolt-fixpoint-stage3-" (os/getpid) ".ss"))
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(def t1 (os/clock))
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(def [c2 e2] (d/emit-image-on-chez prelude-path stage1 stage2))
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(ok "stage2 emits cleanly on Chez" (and (= c2 0) (os/stat stage2))
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(string "exit " c2 " " (string/slice e2 0 (min 300 (length e2)))))
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(when (os/stat stage2)
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(printf "stage2 (on-Chez, from stage1): %d bytes (%.1fs)" (length (slurp stage2)) (- (os/clock) t1)))
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(flush)
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# stage3 = on-Chez compiler (from stage2) re-emits the compiler.
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(def t2 (os/clock))
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(def [c3 e3] (d/emit-image-on-chez prelude-path stage2 stage3))
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(ok "stage3 emits cleanly on Chez" (and (= c3 0) (os/stat stage3))
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(string "exit " c3 " " (string/slice e3 0 (min 300 (length e3)))))
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(when (os/stat stage3)
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(printf "stage3 (on-Chez, from stage2): %d bytes (%.1fs)" (length (slurp stage3)) (- (os/clock) t2)))
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(flush)
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# THE FIXPOINT: stage2 and stage3 must be byte-for-byte identical.
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(when (and (os/stat stage2) (os/stat stage3))
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# slurp returns a buffer; Janet = on buffers is identity, so compare as strings.
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(def s2 (string (slurp stage2))) (def s3 (string (slurp stage3)))
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(ok "stage2 == stage3 (byte-for-byte fixpoint)" (= s2 s3)
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(if (= s2 s3) ""
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(string "sizes " (length s2) " vs " (length s3)
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"; first diff at "
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(let [n (min (length s2) (length s3))]
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(var i 0) (while (and (< i n) (= (s2 i) (s3 i))) (++ i)) i))))
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# A degenerate emitter (emits nothing) would also be "stable" — guard against it.
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(ok "stage2 image is substantial (> 80KB)" (> (length s2) 80000)
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(string "only " (length s2) " bytes")))
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# stage2 must be a WORKING compiler: drive real compile+eval through it.
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(def verify-cases
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[["(let [x 1 y 2] (+ x y))" "3"]
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["(when (> 5 3) (-> 10 (- 1) (* 2)))" "18"]
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["(defn f [a b] (* a b)) (f 6 7)" "42"]
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["(map inc [1 2 3])" "(2 3 4)"]
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["(reduce + 0 (range 5))" "10"]
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["(filter even? (range 10))" "(0 2 4 6 8)"]])
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(when (os/stat stage2)
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(var vpass 0)
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(each [src want] verify-cases
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(def [code out _] (d/eval-zero-janet prelude-path stage2 (string "(do " src ")")))
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(when (and (= code 0) (= out want)) (++ vpass)))
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(ok "stage2 is a working compiler (real cases compile+run)"
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(= vpass (length verify-cases))
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(string vpass "/" (length verify-cases) " cases passed")))
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# cleanup temp stages
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(each p [stage2 stage3] (when (os/stat p) (os/rm p)))
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(printf "\nfixpoint-test: %d/%d checks passed" (- total fails) total)
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(os/exit (if (zero? fails) 0 1))
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