9f076937af
The success checker (RFC 0006) used to lose differing if-branches to :any
and accept the use. (inc (if c "a" :k)) typed the if as :any — sound but
imprecise, since the value is provably {:str | :kw}, every member of which
is in inc's error domain.
Adds {:union #{T...}} to the lattice: join-t forms a scalar union of
differing branches instead of collapsing to :any, capped at 4 distinct
scalars (the member space is the five scalar tags, so the lattice stays
finite and the inter-procedural fixpoint still terminates). The checker's
not-number?/not-seqable? report a union only when EVERY member is in the
error domain — any valid member accepts the call, so still no false
positives. type-name renders "a string or a keyword".
Unions are scalar-only and carry no :struct/:vec/:set key, so every
structural predicate already treats them as opaque — specialization sees
them exactly as :any and codegen is unchanged. Gate green, suite 4718,
conformance 335/335, bench even.
77 lines
4.2 KiB
Text
77 lines
4.2 KiB
Text
# Success-type checking (RFC 0006, jolt-y3b). The structural inference of
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# RFC 0005, reused as a loose checker: flag a core-fn call ONLY when an argument
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# is PROVABLY the wrong type (concrete and in the op's throwing error domain).
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# Ambiguous cases (:any, unions, :truthy) are accepted — no false positives.
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(import ../../src/jolt/api :as api)
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(import ../../src/jolt/backend :as backend)
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(import ../../src/jolt/types :as types)
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(import ../../src/jolt/reader :as reader)
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(print "Success-type checking (jolt-y3b)...")
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(os/setenv "JOLT_DIRECT_LINK" "1")
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(def ctx (api/init {:compile? true}))
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(def pns (types/ctx-find-ns ctx "jolt.passes"))
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(def check (types/var-get (types/ns-find pns "check-form")))
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# diagnostics (a Janet tuple of diag structs) for a source form
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(defn diags [src]
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(api/normalize-pvecs (check (backend/analyze-form ctx (reader/parse-string src)))))
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(defn nd [src] (length (diags src)))
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# --- provably wrong: REPORTED ------------------------------------------------
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(assert (= 1 (nd "(inc \"x\")")) "inc on a string")
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(assert (= 1 (nd "(+ 1 \"x\")")) "+ with a string arg")
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(assert (= 1 (nd "(count :foo)")) "count of a keyword")
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(assert (= 1 (nd "(count 5)")) "count of a number")
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(assert (= 1 (nd "(first 42)")) "first of a number")
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(assert (= 1 (nd "(nth :k 0)")) "nth of a keyword")
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(assert (= 1 (nd "(let [n \"x\"] (inc n))")) "inc on a let-bound string")
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(assert (= 1 (nd "(inc (count :k))")) "inner count of keyword reported (inc of :num is fine)")
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# --- ambiguous / lenient: ACCEPTED (no false positive) -----------------------
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(assert (= 0 (nd "(:k 5)")) "keyword lookup on a number returns nil, not an error")
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(assert (= 0 (nd "(get 5 :k)")) "get on a number returns nil, not an error")
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(assert (= 0 (nd "(fn [x] (inc x))")) "inc on an unknown (:any) param accepted")
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(assert (= 0 (nd "(fn [c] (inc (if c 1 \"x\")))")) "inc on a {:num | :str} branch -> :any, accepted")
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(assert (= 0 (nd "(count \"ab\")")) "count of a string is fine")
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(assert (= 0 (nd "(count [1 2 3])")) "count of a vector is fine")
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(assert (= 0 (nd "(first [1 2 3])")) "first of a vector is fine")
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(assert (= 0 (nd "(inc (count [1 2 3]))")) "count of vector + inc of :num both fine")
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(assert (= 0 (nd "(inc (first [1 2 3]))")) "first of vector -> :num, inc fine")
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# --- bounded unions (jolt-pz5): report only when EVERY member is in the error
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# domain; accept when any member is valid. Differing branches used to collapse
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# to :any (accepted); now they form {:union #{...}} and are checked per-member.
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(assert (= 1 (nd "(fn [c] (inc (if c \"a\" :k)))"))
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"inc of {:str | :kw} — every member non-number — reported")
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(assert (= 0 (nd "(fn [c] (inc (if c 1 \"x\")))"))
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"inc of {:num | :str} — :num is fine — still accepted")
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(assert (= 1 (nd "(fn [c] (count (if c :k 5)))"))
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"count of {:kw | :num} — both non-seqable — reported")
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(assert (= 0 (nd "(fn [c] (count (if c :k \"ab\")))"))
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"count of {:kw | :str} — :str is seqable — accepted")
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(assert (= 1 (nd "(fn [c] (inc (if c \"a\" (if c :k :j))))"))
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"inc of nested all-non-number union reported")
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(assert (= 0 (nd "(fn [c] (inc (if c \"a\" (if c :k 1))))"))
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"inc of union with a buried :num member accepted")
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# a union is opaque to structural specialization — it keeps the dynamic guard,
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# exactly like :any, so a keyword lookup over it is never mis-specialized.
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(assert (= 0 (nd "(fn [c] (:r (if c {:r 1} {:g 2})))"))
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"keyword lookup over a struct union is accepted (no false positive)")
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# --- the diagnostic carries op + type + a message ----------------------------
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(def one (in (diags "(inc \"x\")") 0))
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(assert (= "inc" (get one :op)) "diagnostic names the op")
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(assert (string/find "number" (get one :msg)) "message says a number is required")
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# --- end-to-end: strictness drives compilation (decoupled from :inline?) -----
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# error mode aborts a provably-wrong form's compilation; a correct form compiles.
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(os/setenv "JOLT_TYPE_CHECK" "error")
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(assert (not (first (protect (api/eval-string ctx "(count :nope)"))))
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"error mode aborts a provably-wrong form")
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(assert (first (protect (api/eval-string ctx "(count [1 2 3])")))
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"error mode accepts a correct form")
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(os/setenv "JOLT_TYPE_CHECK" "off")
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(print "Success-type checking passed!")
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