Brummel
caefcf996a
Three sibling sites previously fell back to shallow `ailang_rc_dec` when a binder had non-empty `moved_slots` and a dynamic runtime ctor tag: Iter B Own-param dec at fn-return (lib.rs), Iter A arm-close pattern-binder dec (match_lower.rs), and emit_inlined_partial_drop's non-Ctor branch (drop.rs). Shallow freed the outer cell but did not walk the unmoved ptr fields — silent leak. Adds `emit_partial_drop_fn_for_type`: a per-ADT helper structurally parallel to `emit_drop_fn_for_type` but taking an i64 moved-slots bitmask. Each ptr-field's dec is gated on the corresponding mask bit; the outer box is dec'd at join. Emitted alongside the per-type drop fn for every ADT under --alloc=rc. Three call sites rewritten to resolve the partial_drop symbol from the binder's static type and build the mask from `moved_slots`. Three RED-then-GREEN fixtures (rc_own_param_/rc_match_arm_/ rc_app_let_partial_drop_leak) pin the carve-outs in regression coverage; live cell counts go from 3/1/3 (pre-fix) to 0/0/0. e2e count: 66 → 69. The pre-existing `alloc_rc_own_param_dec_at_fn_return` IR-shape assertion is widened to accept `partial_drop_<m>_<T>(%arg_xs, i64 mask)` as a third valid drop shape (the canonical fu2 case). Closes the JOURNAL queue's only remaining iter; the "wait for organic fixture" stance from the 18g tidy is retracted — known leaks are bugs, CLAUDE.md's TDD rule covers them autonomously.
66 lines
1.9 KiB
Plaintext
66 lines
1.9 KiB
Plaintext
; Iter 18g.tidy.fu2 RED-test fixture 1/3: dynamic-tag partial-drop
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; carve-out at fn-return (Iter B / lib.rs:1093).
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;
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; Shape:
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; - `Pair` carries two `Cell` fields (both pointer-typed).
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; - `Cell` carries two `Wrap` fields (both pointer-typed).
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; - `use_first` takes `(own Pair)` and pattern-binds the first
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; slot only, wildcarding the second.
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; - The bound slot's `Cell` is dec'd via `drop_<m>_Cell` at the
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; outer arm-close (moves[a] empty → field_drop_call routes
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; correctly).
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; - At fn return, `p`'s `consume_count == 0`, mode = Own, and
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; `moved_slots[p] = {0}`. Iter B's drop (lib.rs:1093) hits the
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; dynamic-tag carve-out: moves non-empty → shallow
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; `ailang_rc_dec(p)`. p's outer cell is freed; slot 1 (the
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; wildcarded second Cell + its two MkWrap children = 3 cells)
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; leaks.
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;
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; Pre-fix: live = 3 (one Cell + two MkWrap children).
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; Post-fix: live = 0.
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;
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; This fixture is the cleanest of the three because no inner match
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; is involved: the leak surfaces from Iter B alone.
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(module rc_own_param_partial_drop_leak
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(data Wrap
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(ctor MkWrap (con Int)))
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(data Cell
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(ctor MkCell (con Wrap) (con Wrap)))
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(data Pair
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(ctor MkPair (con Cell) (con Cell)))
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(fn build_pair
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(type
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(fn-type
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(params (con Int))
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(ret (own (con Pair)))))
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(params n)
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(body
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(term-ctor Pair MkPair
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(term-ctor Cell MkCell
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(term-ctor Wrap MkWrap n)
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(term-ctor Wrap MkWrap 2))
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(term-ctor Cell MkCell
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(term-ctor Wrap MkWrap 3)
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(term-ctor Wrap MkWrap 4)))))
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(fn use_first
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(type
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(fn-type
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(params (own (con Pair)))
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(ret (con Int))))
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(params p)
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(body
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(match p
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(case (pat-ctor MkPair a _) 1))))
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(fn main
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(type (fn-type (params) (ret (con Unit)) (effects IO)))
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(params)
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(body
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(do io/print_int (app use_first (app build_pair 1))))))
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