Brummel
6fdb45d2f2
Single iter shipping the post-milestone-24 follow-up named in
docs/specs/2026-05-14-retire-per-type-print-effects.md. After this
iter the only surviving direct-output effect-op is `io/print_str`;
all per-type print primitives are replaced by the polymorphic
`print` helper (prelude, iter 24.3).
Components:
- 92 examples/*.ail fixtures migrated (do io/print_<T> x) →
(app print x); 6 .prose.txt snapshots regenerated via `ail prose`.
- Four-site lockstep compiler deletion: crates/ailang-check/src/builtins.rs
(3 effect_ops.insert blocks + 3 list() rows + the
install_io_print_float_signature test + module + EffectOpSig
doc-comments); crates/ailang-codegen/src/lib.rs lower_app
(3 arms + lowers_io_print_float test); crates/ailang-codegen/src/synth.rs
builtin_effect_op_ret match-arm pattern. Dead `intern_string`
helper removed as a follow-up.
- Five incidental test-body migrations (ailang-check x2, ailang-core
spec_drift + design_schema_drift, ailang-surface/src/lex.rs,
ailang-prose/src/lib.rs round-trip test).
- Cat B test-harness patch: six IR-shape tests in
crates/ail/tests/e2e.rs gained a monomorphise_workspace call
before lower_workspace_with_alloc so they follow the same
pipeline as `ail build` (the home-rolled desugar+lift loop
stayed because mono's precondition is "already lifted"; mono
inserts after lift).
- Six doc-comment touch-ups (lex.rs module doc, parse.rs
diagnostic example, ail/src/main.rs x2, runtime/str.c %g anchor,
crates/ailang-core/specs/form_a.md surface-spec example).
- DESIGN.md seven-site sweep (Decision 11 example, Polymorphic
print past-tense, Heap-Str output sentence, effect-op
invocation comment, Float NaN paragraph re-anchored on
float_to_str, two "What is supported" lists).
- Three E2E test-comment polish + four IR-snapshot refresh + one
canonical-hash pin update (plan-unanticipated downstream
consequences of the corpus migration).
- bench/{check,compile_check,cross_lang}.py: all exit 0; no
ratification needed.
- Roadmap entry struck through; per-iter journal at
docs/journals/2026-05-14-iter-rpe.1.md.
Tests 564/0/3. cargo clippy and cargo doc: zero warnings.
Two upstream codegen bugs surfaced during the first BLOCKED
attempt and were fixed in separate iters before this retry:
- 1fb225e bugfix: mono cursor misalignment at poly-free-fn Var
with class-constrained Forall.
- feb9413 bugfix: print leak — propagate ret_mode through rigid
substitution + prelude Show.show ret_mode.
Known debt (carried forward for next /audit):
- Emitter.strings field is functionally dead post-iter (orphan
after intern_string removal); cycles over empty map harmlessly.
100 lines
2.9 KiB
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100 lines
2.9 KiB
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; Bench fixture (Bench iter): linked-list build + sum.
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;
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; Drives the heap allocator hard via a recursive Cons spine. Every
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; ICons cell is one allocation (24 bytes: tag + Int payload + tail).
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; A list of length N therefore costs N allocations. We invoke the
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; workload at three different sizes within a single program run to
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; cover small / medium / large territory.
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;
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; Both `cons_n` (build) and `sum_list` (traverse) are written in
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; accumulator form so the recursive call sits in tail position and
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; can be marked `tail-app`. This is essential at the sizes used here:
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; without `musttail`, three million stack frames overflow the default
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; thread stack and segfault.
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;
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; Workload sizes (hardcoded — AILang has no env-var/argv pipeline):
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;
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; 100_000 * 24 B = 2.4 MB
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; 1_000_000 * 24 B = 24 MB
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; 3_000_000 * 24 B = 72 MB
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;
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; (3M was chosen as the largest size that comfortably fits inside the
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; bump allocator's 256 MB arena with headroom for closure pairs and
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; misc allocations.)
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;
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; Build is allocation-heavy; sum is pure traversal of already-allocated
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; heap (the interesting one for GC pressure / barrier overhead).
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;
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; Expected stdout (one int per line, the sum 0+1+...+(N-1) = N*(N-1)/2):
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; 100_000 -> 4999950000
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; 1_000_000 -> 499999500000
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; 3_000_000 -> 4499998500000
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(module bench_list_sum
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(data IntList
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(ctor INil)
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(ctor ICons (con Int) (con IntList)))
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(fn cons_n_acc
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(doc "Tail-recursive list builder. Result = accumulator-prepended list.")
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(type
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(fn-type
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(params (con Int) (con IntList))
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(ret (con IntList))))
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(params n acc)
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(body
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(if (app == n 0)
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acc
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(tail-app cons_n_acc
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(app - n 1)
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(term-ctor IntList ICons (app - n 1) acc)))))
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(fn cons_n
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(doc "Build [0, 1, ..., n-1] :: IntList. Order doesn't matter for sum.")
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(type
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(fn-type
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(params (con Int))
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(ret (con IntList))))
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(params n)
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(body
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(app cons_n_acc n (term-ctor IntList INil))))
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(fn sum_acc
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(doc "Tail-recursive sum.")
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(type
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(fn-type
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(params (con IntList) (con Int))
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(ret (con Int))))
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(params xs acc)
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(body
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(match xs
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(case (pat-ctor INil) acc)
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(case (pat-ctor ICons h t)
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(tail-app sum_acc t (app + acc h))))))
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(fn sum_list
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(doc "Sum every element. Calls sum_acc with seed 0.")
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(type
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(fn-type
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(params (con IntList))
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(ret (con Int))))
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(params xs)
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(body
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(app sum_acc xs 0)))
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(fn run_one
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(doc "Build a list of length n, sum it, print the sum.")
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(type (fn-type (params (con Int)) (ret (con Unit)) (effects IO)))
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(params n)
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(body
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(app print (app sum_list (app cons_n n)))))
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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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(seq (app run_one 100000)
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(seq (app run_one 1000000)
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(app run_one 3000000))))))
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