6aed4d01ae
Re-derive each app fn's param types from its call sites under --opt, so a record type flows across fn boundaries: a ctor's return reaches a callee param, and a typed vector's element reaches a HOF closure's param. The back end can then bare-index field reads and devirtualize protocol calls at those sites (it reads the resulting :hint/:devirt annotations; consuming them is separate work). This rebuilds the inter-procedural driver the Janet host had — the API (infer-body/reinfer-def) survived the rehost but nothing drove it, and the record-shapes/protocol-methods registries were empty stubs. - records.ss: populate record-shapes (ctor key -> fields/tags/type, resolving nested record field tags) and protocol-methods (method var -> [proto method]) registries at deftype/defprotocol load time; jolt.host accessors materialize them. - passes/types.clj: wp-infer! runs a closed-world fixpoint joining call-site arg types into callee params; reinfer-def re-seeds each def at emit. Self- recursive calls and fn-level recur are collected so a recursive fn's params are constrained by its recursion, not just external callers — else a param the recursion widens (e.g. binary-trees check-tree, whose untagged child can be nil) would be unsoundly typed non-nil. A fn used in value position keeps :any params (callers unknown). Megamorphic sites join to :any. - build.ss: analyze all app forms and run the fixpoint before per-form emit. - run-wp.ss: gate (cross-fn propagation, escape soundness, self-recursion). make test / shakesmoke green, 0 new divergences, selfhost holds.
96 lines
4.8 KiB
Scheme
96 lines
4.8 KiB
Scheme
;; run-wp.ss — whole-program param-type fixpoint gate (jolt.passes.types/wp-infer!).
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;;
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;; run-infer.ss drives the per-form inference; this drives the inter-procedural
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;; driver: analyze a multi-def unit, run wp-infer!, and assert that a record type
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;; flows across fn boundaries — a callee's param picks up its caller's ctor return
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;; type, so a field read off it is marked for the bare-index back-end path.
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;;
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;; chez --script host/chez/run-wp.ss
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(import (chezscheme))
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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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(define analyze (var-deref "jolt.analyzer" "analyze"))
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(define run-inference (var-deref "jolt.passes.types" "run-inference"))
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(define set-record-shapes! (var-deref "jolt.passes.types" "set-record-shapes!"))
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(define set-protocol-methods! (var-deref "jolt.passes.types" "set-protocol-methods!"))
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(define wp-infer! (var-deref "jolt.passes.types" "wp-infer!"))
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(define param-seeds-for (var-deref "jolt.passes.types" "param-seeds-for"))
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(define reinfer-def (var-deref "jolt.passes.types" "reinfer-def"))
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(define pr-str (var-deref "clojure.core" "pr-str"))
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(define (anode src) (analyze (make-analyze-ctx "user") (jolt-ce-read src)))
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(define (contains-sub? s sub)
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(let ((n (string-length s)) (m (string-length sub)))
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(let loop ((i 0))
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(cond ((> (+ i m) n) #f)
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((string=? (substring s i (+ i m)) sub) #t)
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(else (loop (+ i 1)))))))
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(define fails 0) (define total 0)
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(define (check label actual expected)
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(set! total (+ total 1))
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(unless (equal? actual expected)
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(set! fails (+ fails 1))
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(printf " FAIL ~a: got ~s expected ~s\n" label actual expected)))
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;; Node record shape (left/right untagged), like binary-trees.
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(set-record-shapes!
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(jolt-hash-map "user/->Node"
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(jolt-hash-map (keyword #f "fields") (jolt-vector (keyword #f "left") (keyword #f "right"))
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(keyword #f "tags") (jolt-vector jolt-nil jolt-nil)
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(keyword #f "type") "user.Node")))
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(set-protocol-methods! (jolt-hash-map))
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;; a 3-def unit: make-tree returns ->Node, run calls check-tree with a make-tree
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;; result, so check-tree's `node` param must be inferred as a Node.
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(define mt (anode "(def make-tree (fn [depth] (if (zero? depth) (->Node nil nil) (->Node (make-tree (dec depth)) (make-tree (dec depth))))))"))
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(define ct (anode "(def check-tree (fn [node] (:left node)))"))
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(define rn (anode "(def run (fn [d] (check-tree (make-tree d))))"))
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(wp-infer! (jolt-vector mt ct rn))
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;; check-tree's param `node` should be seeded with a struct carrying the Node type
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(define seed (param-seeds-for "user/check-tree"))
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(check "check-tree has a param seed" (jolt-truthy? seed) #t)
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(when (jolt-truthy? seed)
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(check "node seeded as user.Node struct"
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(contains-sub? (pr-str seed) "user.Node") #t))
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;; reinfer-def then must mark the (:left node) read site for the bare-index path
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(define marked (reinfer-def ct seed))
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(check "read site marked :hint :struct" (contains-sub? (pr-str marked) ":hint :struct") #t)
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;; a fn used only via value position (escape) must NOT be specialized — unknown
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;; callers make a concrete seed unsound.
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(define ev (anode "(def use-it (fn [f] (f 1)))"))
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(define ec (anode "(def caller (fn [] (use-it check-tree)))")) ; check-tree escapes
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(wp-infer! (jolt-vector mt ct rn ev ec))
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(check "escaped fn keeps no param seed" (jolt-truthy? (param-seeds-for "user/check-tree")) #f)
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;; a self-recursive fn that recurses on a NILABLE field (an untagged record field
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;; is :any, so the child can be nil) must NOT be specialized — the recursion can
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;; pass nil, so typing the param as a non-nil record would be unsound.
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(define ctr (anode "(def walk (fn [node] (let [l (:left node)] (if (nil? l) 1 (walk l)))))"))
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(define rnr (anode "(def run2 (fn [d] (walk (make-tree d))))"))
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(wp-infer! (jolt-vector mt ctr rnr))
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(check "self-recursive nilable param not specialized"
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(jolt-truthy? (param-seeds-for "user/walk")) #f)
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;; a self-recursive fn that recurses passing the SAME record type (make-tree always
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;; returns a Node) is still safe to specialize — the recursion preserves the type.
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(define mtt (anode "(def grow (fn [n acc] (if (zero? n) acc (grow (dec n) (->Node acc acc)))))"))
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(define gcl (anode "(def gcaller (fn [] (grow 5 (->Node nil nil))))"))
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(wp-infer! (jolt-vector mtt gcl))
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(check "self-recursive same-type param keeps its seed"
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(jolt-truthy? (param-seeds-for "user/grow")) #t)
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(if (= fails 0)
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(begin (printf "wp gate: ~a/~a passed\n" total total) (exit 0))
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(begin (printf "wp gate: ~a/~a passed (~a failed)\n" (- total fails) total fails) (exit 1)))
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