Brummel
76b21c00eb
Deletes `ParamMode::Implicit`. `ParamMode` is now `{Own, Borrow}`:
every fn-type slot on every signature carries an explicit `own` or
`borrow`, no defaulted position survives anywhere (model 0008 §2,
spec 0062). The parser rejects a bare fn-type slot; `borrow-return`
and `borrow-over-value` reject at the signature; the corpus is
migrated to minimal-ownership modes (consumed ⇒ own, read-only-heap
⇒ borrow, value ⇒ trivial-own). The documented `Implicit`-ret-mode
leak is fixed: an owned heap return now drops exactly once (live=0,
acceptance criterion 5).
This was the easy half. Removing the default ACTIVATED a family of
drop paths that `Implicit` had silently skipped — the pre-cutover
language was leaking (and in places mis-dropping) here rather than
crashing, because an Implicit scrutinee turned the drop off. Making
the modes explicit (Own) turned those paths on and exposed two
latent-bug clusters, all fixed RED-first as part of this cutover:
Drop-soundness family (four legs):
A. lit-sub-pattern double-free — the desugar re-matched the same
owned scrutinee in the lit fall-through; fixed by grouping
consecutive same-ctor arms into one match (bind fields once),
in ailang-core desugar.
B. Cons-husk leak on non-tail arm bodies — the lit-sub-pattern
desugar rebound the owned scrutinee via `Let $mp = xs`, which
bumped consume_count and suppressed the existing fn-return
partial_drop. Fixed by not rebinding a bare-Var scrutinee
(one husk-freeing mechanism, not two).
C. polymorphic `drop_<T>` rc_dec'd monomorphised value fields —
the per-ADT drop fn was emitted once from the polymorphic
TypeDef, defaulting type-var fields to ptr and rc_dec'ing
inline Ints (segfault). Fixed with per-monomorph drop
functions (new ailang-codegen::dropmono): the drop set is
collected from the lowered MIR, value-type fields are skipped,
heap fields still freed once; monomorphic-concrete ADTs keep
their byte-identical un-suffixed drop symbol.
D. static Str literal passed to an `(own Str)` param — the
literal lowers to a header-less rodata constant; the callee's
now-active rc_dec read its length field as a refcount and
freed a static address (segfault). Fixed with the missing
fourth StrRep::Static→Heap promotion in lower_to_mir's App arm,
gated on Own mode (borrow args stay static, no regression).
over-strict-mode lint over-fired: it suggested `(borrow V)` for
value-typed params (which `borrow-over-value` rejects — own is the
only legal mode there) and fired on `(intrinsic)` bodies (whose
consumption the linearity walk cannot observe). Tightened to skip
both; contract 0008 updated to the narrowed firing scope.
Irreversible step — canonical-form hash reset (model 0008 §6,
acceptance criterion 6). Every signature now carries explicit modes,
so the hashable canonical JSON changed for every module. RATIFY:
the corpus-wide hash-pin reset (hash_pin, prelude_module_hash_pin,
mono_hash_stability, eq_ord_e2e, embed_export_hash_stable, the
ct4/iter*/loop_recur schema-extension pins) and the list ir_snapshot
golden were regenerated once, deliberately, as the intended one-time
consequence of removing the mode elision from the canonical form —
not a regression. Each regenerated hash verified deterministic across
two runs.
Also fixes a pre-existing latent failure surfaced by the verification
gate, unrelated to this cutover: the `every_contract_names_a_resolvable_
ratifying_test` resolver (design_index_pin) could not resolve the
" + " dual-link ratifying-test form (`uniqueness.rs + linearity.rs`)
that the #57 audit-close (dfdc65f) introduced — it shipped red on that
commit. Resolver taught the dual-link form, mirroring its sibling.
Verification: cargo test --workspace = 731 passed, 0 failed (twice,
stable); e2e 102 passed, no binary exits non-zero (corpus crash-free);
grep-clean for Implicit/fn_implicit/mode_eq across crates; every drop
fix confirmed via emitted IR + AILANG_RC_STATS balance on the head==K,
head!=K, and Nil paths. Three BLOCKEDs en route (the unsound first
husk-dec attempt, the over-strict derivation premise, the leg-B fix
direction) were each treated as a real design/spec gap and rediagnosed,
not patched over.
Supersedes #54 (return-position-only leak patch). Precondition #57
(linearity hardening) was already met. Spec docs/specs/0062, plan
docs/plans/0121.
closes #55
58 lines
2.4 KiB
Plaintext
58 lines
2.4 KiB
Plaintext
; Fieldtest raw-buf.1 (Axis 1, RawBuf as mutable indexed storage).
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; Task an LLM author is naturally given: "build a small score table of
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; N slots, fill slot i with a computed score (i*i + 1), then read every
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; slot back and total the scores." The natural shape uses RawBuf.size to
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; drive the read loop rather than hard-coding the bound, which the spec's
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; worked program (literal 0/1/2 indices) never exercises.
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;
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; Fill loop: thread the owned buffer through RawBuf.set in a (loop ...)
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; with a recur per slot. Read loop: borrow the buffer, drive i from 0 to
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; (RawBuf.size buf) accumulating (RawBuf.get buf i).
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;
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; Expected stdout: scores 1, 2, 5, 10, 17 -> sum 35.
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;
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; This was the fieldtest repro for two defects, both now fixed:
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; - B1 (#46): the `total` helper, which takes `borrow (RawBuf Int)`
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; and only calls RawBuf.size / RawBuf.get on the receiver, was
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; falsely rejected with [consume-while-borrowed]. The linearity
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; pass now resolves the type-scoped borrow-receiver ops, so the
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; borrow helper checks clean.
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; - B2 (#47): the `fill` loop, threading the owned buffer through a
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; `recur`, failed codegen with `unknown variable: b`. The synth
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; type-replay now descends through `loop` with the loop binders in
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; scope.
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; OUTCOME (current): checks, builds, runs; prints 35. Leak-clean under
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; AILANG_RC_STATS (the owned buffer drops at scope close, B5).
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(module rawbuf_1_score_table
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(fn fill
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(doc "Fill slots 0..n of buf with (i*i + 1). Linear: own in, own out.")
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(type (fn-type (params (own (con RawBuf (con Int))) (own (con Int))) (ret (own (con RawBuf (con Int))))))
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(params buf n)
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(body
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(loop (b (con RawBuf (con Int)) buf) (i (con Int) 0)
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(if (app ge i n)
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b
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(recur (app RawBuf.set b i (app + (app * i i) 1))
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(app + i 1))))))
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(fn total
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(doc "Sum every slot of buf, driving the bound off RawBuf.size.")
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(type (fn-type (params (borrow (con RawBuf (con Int)))) (ret (own (con Int)))))
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(params buf)
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(body
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(loop (acc (con Int) 0) (i (con Int) 0)
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(if (app ge i (app RawBuf.size buf))
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acc
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(recur (app + acc (app RawBuf.get buf i))
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(app + i 1))))))
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(fn main
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(type (fn-type (params) (ret (own (con Unit))) (effects IO)))
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(params)
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(body
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(let buf (new RawBuf (con Int) 5)
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(let buf (app fill buf 5)
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(app print (app total buf)))))))
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