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Author SHA1 Message Date
swaits cb38d936dc chore: repoint URLs at git.swaits.com and bump for release 
Rewrites remaining github.com / git.sr.ht references to git.swaits.com,
translating GitHub URL shapes to Gitea's (/blob/<ref>/ -> /src/branch/<ref>/,
/tree/<tag> -> /src/tag/<tag>, /actions/workflows/X -> /actions?workflow=X,
/edit/ -> /_edit/).

Left pointing at GitHub on purpose: pull-request links (PRs were not migrated)
and GitHub-only surfaces Gitea lacks (security advisories, discussions).
 2026-08-31 17:58:32 -06:00
swaits a068a982f7 chore: point repository at git.swaits.com 2026-08-31 17:19:16 -06:00
swaits 5f933f98fa chore(release): 0.6.0 2026-05-04 15:29:24 -06:00
swaits d8bda344fd safety(verify): Creusot-verified validator for the path-table safety predicates 
Closes the formal-verification side of the unsafe surface. The
const-eval block I added to hsmc-macros (commit nuux) catches any
chart whose emitted tables violate P1 + P2 at user `cargo check`
time — but until now its check predicate was a hand-written
expression with no machine-checked link to "P1 + P2 hold for the
unsafe blocks that follow".

This commit adds Pearlite-annotated functions in
verification/src/paths.rs that decide P1 + P2 for arbitrary
__PATH_RANGE / __PATH_DATA / __TERMINATE_* / __DEFAULT_CHILD inputs.
Each function carries `#[ensures(... forall ...)]` stating the
universal predicate it computes; Creusot discharges that the body
matches. The const-eval block evaluates the *same expressions* on
each chart's actual emitted tables — pinned by
correspondence_paths.rs::the_const_eval_block_predicate_matches_the_validator
which compares both directly on representative and adversarial
inputs.

End-to-end safety chain:

  - hsmc-macros emits __PATH_RANGE / etc. for every chart.
  - Const-eval re-runs the predicate on the chart's actual tables
    at build time. Build fails on any violation.
  - The validator's predicate is in turn machine-proven (Creusot
    `forall<i: Int>`) to match P1 + P2.

Net: every chart that compiles has had its tables verified by a
function whose correctness is formally proven. Operationally
equivalent to a universal "no chart can fail" proof for end users
— every chart they compile is verified.

Files:
- verification/src/paths.rs (new): five validators
  (check_path_range_invariant, check_terminate_range_invariant,
  check_state_ids_in_bounds, check_default_child_in_bounds,
  check_path_tables_sound) with full Pearlite contracts. 10 unit
  tests pin executable behavior.
- verification/tests/correspondence_paths.rs (new): 9 tests
  including the predicate-equality test above.
- verification/INVARIANTS.md: new "Path tables" section with five
  spec rows + aggregate. The previous "Phase 4: transition() codegen
  invariants" out-of-scope item is reclassified Phase 5 (universal
  proof of compute_transition_paths itself) — bigger than needed
  for the end-user safety guarantee.
- docs/004: rewrites the "Creusot deductive proofs" check with the
  new architecture and explains why per-instance verification at
  `cargo check` is operationally equivalent to universal proof.

Run:
  cargo test -p hsmc-verification    # 10 unit + 9 correspondence
  just verify                        # discharge Creusot VCs
  just safety                        # full unsafe audit in one shot
 2026-05-04 15:29:24 -06:00
swaits 2d38af60f6 safety(audit): cargo-mutants reaches 98% coverage on the unsafe-touching codegen 
The earlier safety-audit run reported 16/53 missed mutants in
compute_transition_paths and concluded the LCA depth-walk wasn't
covered by tests. Wrong diagnosis. cargo-mutants infers the
test-package from the file under mutation, so without an explicit
override it ran only the hsmc-macros per-package test set
(essentially trybuild fixtures). All the asymmetric-depth lateral
coverage in det_lateral.rs et al. is in the hsmc/ workspace tests
and was sitting on the bench.

With `--test-package hsmc --features hsmc/tokio,hsmc/journal`:

  codegen.rs safety fns:  51/53 (14 caught + 37 unviable + 2 missed)
  hsmc/src/lib.rs:        48/48 (45 caught + 3 unviable + 0 missed)
  total:                  99/101 = 98%

The 2 remaining are equivalent mutants — transformations that
provably produce identical __PATH_RANGE / __PATH_DATA output and
so cannot be distinguished by any behavior test:

  1. `da > db` → `da >= db` in the LCA depth-equalizer:
     the mutated loop walks `a` one extra step in the equality case;
     the next loop (`while db > da`) compensates symmetrically.
     parent(root) = None short-circuits any walk past root. Same
     LCA, same paths. Verified by hand on lateral, up-transition,
     and asymmetric-depth (4↔2) inputs.

  2. `from != to && is_strict_ancestor(...)` → `from == to && ...`:
     becomes always-false (a state isn't its own strict ancestor),
     so the up-transition branch is dead code. Up-transitions then
     fall through to the lateral branch, which computes
     lca(from, to) = to (target is ancestor of source), walks
     source up to (exclusive of) to, and produces an empty enter
     path. Same paths.

Both are documented in docs/004 § "The two equivalent mutants".

Updates:
- justfile `just safety`: add the correct flags so future runs
  reproduce 99/101 instead of the misleading 37/53.
- docs/004: corrected mutants section, equivalent-mutant analysis,
  removed the false "asymmetric-depth test gap" claim.
 2026-05-04 15:29:24 -06:00
swaits ad2aa6e04d docs(safety): document the unsafe contract end-to-end 
After Opt #2 added six bounded `get_unchecked` blocks per chart, the
project's two "no unsafe" claims (README §"At a glance" + spec §11
rule 12) were stale, and there was no single place answering "how
do I know the unsafe is correct?".

This commit closes both gaps:

- New: docs/004. unsafe-safety-contract.md
  Inventories every unsafe site, names the predicate, names what
  establishes it (codegen-time guarantee), and lists the five
  layered checks (const-eval, debug_assert, miri, mutants, Creusot)
  with current status. Documents what's *not* yet covered (the
  16-of-53 missed mutants in the LCA depth walk are behavior, not
  safety; transition() codegen invariants are still Phase-4 for
  Creusot). Includes a maintenance checklist for future unsafe.

- README points at the doc and gives an honest one-paragraph
  summary instead of "no unsafe".

- Spec rule 12 rewritten from "no unsafe in generated code" to
  "bounded unsafe in generated code, none in user code" with a
  pointer to the audit.

- justfile gains `just safety` — runs const-eval (cargo check),
  debug_assert tests, miri, and mutants in one shot. Mirrors the
  doc's audit matrix so the doc never goes stale silently.
 2026-05-04 15:29:24 -06:00
swaits 98352b0e4d safety(codegen): compile-time const-eval checks for table invariants 
Every codegen-emitted statechart now contains a const block that
verifies the safety preconditions of every unsafe get_unchecked at
build time. Any future codegen change that produces an out-of-range
offset or a malformed (s, m, e) triple in __PATH_RANGE /
__TERMINATE_RANGE fails `cargo check` with a named diagnostic
instead of being deferred to runtime UB.

Checks performed (per chart):
  - __PATH_RANGE[i] = (s, m, e) satisfies 0 <= s <= m <= e and
    e <= __PATH_DATA.len()
  - __TERMINATE_RANGE[i] = (s, e) satisfies 0 <= s <= e and
    e <= __TERMINATE_DATA.len()
  - Every state id stored in __PATH_DATA / __TERMINATE_DATA is
    < N_STATES
  - Every Some(t) in __DEFAULT_CHILD names a state id < N_STATES

The const block evaluates at type-check (cargo check), produces no
runtime code, and runs once per chart definition. Verified by
manually injecting a bad triple — rustc reports `E0080: evaluation
panicked: __PATH_RANGE: e past __PATH_DATA end`.

Combined with the runtime debug_assert! companions (this commit
chain) and miri (zero UB on 66 tests), the static and dynamic checks
together cover every safety predicate the unsafe blocks rely on.
 2026-05-04 15:29:24 -06:00
swaits b9645f80cb safety(codegen): debug_assert companion for every unsafe get_unchecked 
Pair every codegen-emitted `unsafe { ... get_unchecked ... }` with a
debug_assert! that re-states the safety obligation as a runtime
predicate. Free in release (debug_assert! compiles to nothing); in
dev/test/miri builds, every dispatch through the 68 behavior tests
exercises these checks, so any future regression in the codegen's
invariants trips loudly.

Sites covered:
  - step()'s __DISPATCH lookup        (sync + async)
  - apply_path()'s __PATH_RANGE +
    __PATH_DATA[..] slice ranges      (sync + async)
  - follow_defaults()'s __DEFAULT_CHILD lookup (sync + async)
  - do_terminate()'s __TERMINATE_RANGE +
    __TERMINATE_DATA[..] slice ranges (sync + async)

Verification:
  - cargo nextest: 68/68 pass (debug_assert! active)
  - cargo +nightly miri test: 66/66 pass (UB detector)
  - cargo bench --bench dispatch: zero release-mode regression
    (asserts compile out as expected)
 2026-05-04 15:29:24 -06:00
swaits da1f3046b4 docs(readme): qualify the no-unsafe claim 
After Opt #2 (get_unchecked for codegen table indexing), the macro
emits ~6 unsafe blocks per chart (in apply_path, do_terminate,
follow_defaults, and step's __DISPATCH lookup). Each is a bounded
get_unchecked into a codegen-owned static table whose `idx < len`
invariant holds by construction (state ids are produced by codegen
itself, not user input). User code remains unsafe-free.

Update both bullets:
- "no Mutex, no unsafe" → "no Mutex, no unsafe in your code"
  (in the during/split-borrow context)
- "No heap, no unsafe, no dynamic dispatch" → drop the unsafe
  exception with an honest one-sentence note about where it lives
  and why.
 2026-05-04 15:29:24 -06:00
swaits 2f37f261c5 docs(bench): refresh baseline.txt with post-opt numbers and rationale 
Captures Opt #1-#4 outcomes:
- Opt #2 (get_unchecked) and #4 (timer-pop inline) landed.
- Opt #3 (run_action proxy/context) was already free.
- Opt #1 (Option<u16> → sentinel) tried, reverted (-0.6% net).

Documents the gungraun-wrapper measurement floor.
 2026-05-04 15:29:24 -06:00
swaits 8cd1aea646 perf(timer): inline TimerTable::pop_expired_nonempty 
Drop the #[cold] attribute and add #[inline]. The hint-cold was
keeping the body out-of-line at every call site (one per chart that
declares any after() trigger), which forced a real function call
through the x86_64 ABI plus its register-spill prologue/epilogue —
~10-15 instructions of pure framing on top of the body's own cost.
Inlining lets LLVM fold the body into the codegen-emitted
timer_pop_block at step()'s timer-pop site; for the timer_fire
bench, run_handlers also gets inlined into step() as a knock-on,
because the inliner's budget is no longer being spent on a separate
pop_expired_nonempty call.

Bench delta (vs. after_opt2_unchecked, instructions):

  timer_fire_dispatch    212 → 175   -17%
  bubble_top              94 →  93    -1%   (incidental)
  others: unchanged

Code-size cost: pop_expired_nonempty is short and inlines cheaply;
the binary size before/after differs by a handful of bytes per
chart-with-timers call site. The original #[cold] attribute appears
to have been a guess (timer arming is rare → mark cold) that was
wrong: when a chart has timers at all, the empty-check in pop_expired
is the cold path; pop_expired_nonempty itself runs on every step()
of any state with an active timer.
 2026-05-04 15:29:23 -06:00
swaits d5ef6a6944 perf(codegen): get_unchecked for codegen table indexing 
Hot-path lookups into __DISPATCH, __DEFAULT_CHILD, __PATH_RANGE,
__PATH_DATA, __TERMINATE_RANGE and __TERMINATE_DATA all index by
state ids the codegen produces (current state, transition targets,
__PATH_RANGE-emitted offsets), every one of which is provably in
bounds by codegen invariant. Replace the `[idx]` / `[s..e]` checked
forms with `get_unchecked`.

The instruction-count drop is far larger than the bounds checks
themselves explain: under the new types LLVM gets enough range
proofs to inline `apply_path` into `step()` for h2/h4/h8/bubble
charts, and inline `step()` itself into the bench wrapper for h2
and h8. The cold-path enter chain on h2_cold_start collapses to a
single u16 store.

Bench deltas (vs. gungraun_initial baseline, instructions):

  h2_cold_start          131 →  24   -82%   (full inline)
  h2_warm_lateral        119 →  53   -55%
  h4_cross_tree          128 →  93   -27%
  h4_up                  114 →  88   -23%
  h4_self                128 →  93   -27%
  h8_cross_tree           97 →  53   -45%   (full inline)
  bubble_leaf/mid/top    129 →  94   -27%
  timer_fire_dispatch    221 → 212    -4%
  terminate_event         68 →  53   -22%
  bubble_cross_tree      120 →  85   -29%
  chain_self_emit        500 → 439   -12%

All 68 hsmc behavior tests pass. Safety notes are inline at each
unsafe block; the invariants come from codegen, not user input —
the user-facing API does not write to any of these fields.
 2026-05-04 15:29:23 -06:00
swaits 915b7ce101 chore(bench): migrate dispatch harness from iai-callgrind to gungraun 
iai-callgrind is unmaintained; gungraun is the active fork. API is
drop-in (use iai_callgrind → use gungraun, same library_benchmark /
library_benchmark_group / main! macros), so the dispatch.rs body only
needed the import rename.

Also:
- mise.toml: add cargo:gungraun-runner dep so the valgrind harness
  binary tracks the lib version automatically.
- baseline.txt: rebaselined under gungraun_initial. Absolute numbers
  shifted up because gungraun's bench wrapper instruments more than
  iai-callgrind 0.16's did; comparable benches (terminate_event 69→68,
  h8_cross_tree 93→97) confirm HSM dispatch work itself is unchanged.
  Old iai-callgrind named baselines kept as historical context only.
 2026-05-04 15:29:23 -06:00
swaits 1f98a9bf5b chore(release): 0.5.1 2026-04-29 09:50:36 -06:00
swaits 9eb1d10b28 chore(release): 0.5.0 2026-04-28 21:03:05 -06:00
swaitsandClaude Opus 4.7 3fc0d7c57d feat(default)!: model default(...) as a real LCA-aware transition 
`default(...)` is now a transition with the same semantics as any
event-driven transition. It fires immediately after the declaring
state's entries finish and its durings start, applying the standard
exit-to-LCA / enter-to-target algorithm. Three behavioral changes
follow from this unification:

* Optional. A state with children is no longer required to declare a
  `default(...)`. When omitted, the state itself is the resting
  innermost active state; substates are reachable only via explicit
  transitions. This is the "microwave Standby" pattern — Standby
  has substates like LowPower that you enter only on demand, and
  `=> Standby;` lands at Standby itself with no descent.

* Targets anywhere. The default target may be any state in the chart
  — a child (the classic descent case), a sibling, an ancestor,
  anywhere. `default(<sibling-or-ancestor>)` exits the just-entered
  state as part of the default-fire transition; the same rule fires
  whether you wrote it for descent, redirection, or up-bounce.

* Cycle-checked at compile time. The default-edge graph (out-degree
  ≤ 1 per node) is rejected if it contains any cycle, including
  `default(self)`. `state A { default(A); }` and `A → B → A` chains
  fail to compile with a pinpoint error message naming the cycle.
  This guarantees default chains terminate at runtime.

Implementation:

* `validate.rs`: drop the "must be direct child" and "must have
  children" restrictions; add `validate_default_graph` (iterative
  three-color cycle detection via chain walk).

* `ir.rs`: keep the unresolved default ident through to
  `resolve_transitions` so non-child targets resolve against the
  global state-name map (the same map transition targets use).

* `codegen.rs`: precomputed `(from, to)` paths no longer fold default
  descent into the enter slice — each path is LCA-relative
  `(exit, enter)` ending exactly at the explicit target.
  `descend_defaults` (a parent-pointer walk) is replaced by
  `follow_defaults`, which fires real transitions through
  `apply_path` and emits `TransitionFired{Internal}` /
  `TransitionComplete` brackets per link. Up-transitions don't
  trigger default-following (nothing was freshly entered, so no
  state's default fires).

* `active_durings_per_innermost_state`: predicate widened to include
  composites without a default (they can now be the innermost active
  state, so any durings they declare must be raced when current).

BREAKING CHANGES:

* Journal format. Default-fires now emit `TransitionFired` (with
  `reason: TransitionReason::Internal`) and `TransitionComplete`
  brackets around their entry sequence. `Internal` was previously
  reserved and never emitted; it is now active. Tests that
  hand-build expected journal sequences must include these brackets
  around every default-fire.

* Validation. `default(<non-child>)` and `default` on a childless
  state previously raised compile-time errors. Both are now valid.
  Code relying on these as guard rails must adapt.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
 2026-04-28 20:57:01 -06:00
swaitsandClaude Opus 4.7 2e55484080 chore(release): 0.4.1 
Bump workspace version 0.4.0 → 0.4.1.

Patch release: dispatch hot-path performance only. No public API
changes; every chart that compiled against 0.4.0 compiles unchanged
and behaves identically. CHANGELOG.md captures the per-pass writeup
under the 0.4.1 heading.

Headlines (deepest dispatch in the bench suite):
  h8_cross_tree     -82% instructions / -72% cycles  vs pre_lca_fix
  bubble_top        -22% instructions /  -6% cycles  vs handler walk
  terminate_event   -22% instructions / -23% cycles  vs PARENT walk

The runtime LCA helper, is_up_transition, the per-call heapless::Vec
ancestry build, the runtime PARENT bubble walk, and (on timer-free
charts) the entire TimerTable machinery are all gone. Callgrind
reports the entire HSM machinery as a single inlined `step` symbol.

Bench suite expanded from 7 to 13 benches: bubble_leaf/mid/top
quantify handler resolution at varying ancestor depths,
timer_fire_dispatch covers the only path that exercises pop_expired's
non-empty branch, terminate_event covers do_terminate, and
bubble_cross_tree covers the realistic HSM worst case (deep bubble +
deep cross-tree transition).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
 2026-04-28 19:11:29 -06:00
swaitsandClaude Opus 4.7 dc97419161 perf: precompute transition/dispatch/terminate paths; shrink TimerEntry to u64 
Six codegen-side optimization passes against step() and friends. No
user-facing API changes; all 296 tests pass under no-default, tokio,
embassy, and tokio+journal. Cumulative on h8_cross_tree (deepest
dispatch in the suite): -82% instructions / -72% cycles vs the
pre_lca_fix baseline.

* __PATH_DATA + __PATH_RANGE: per-(from, to) precomputed exit/enter
  sequences. Up/self/lateral semantics fold into one indexed lookup;
  removes lca() and is_up_transition() runtime helpers and the
  per-call heapless::Vec<u16, 16> ancestry build. Hierarchy depth no
  longer bounded by Vec capacity.

* __DISPATCH[(state, event)]: precomputed handler resolution. The
  runtime __PARENT bubble walk + per-hop __handler_lookup call in
  step() collapses to one indexed lookup. Bubble resolution is now
  O(1) regardless of depth -- bubble_top (4-hop) is within 3
  instructions of bubble_leaf (handler on current).
  __handler_lookup retained for timer dispatch.

* __TERMINATE_DATA: per-state precomputed exit chain (root inclusive
  -- chart-root entry/exit actions are valid). do_terminate() indexes
  the slice instead of walking __PARENT, and uses Deque::clear()
  (O(1) in heapless 0.8) instead of pop_front-loop. terminate_event
  bench: -22.5% instr / -23.4% cycles.

* TimerTable empty-skip: pop_expired / min_remaining / decrement /
  cancel_state each get inlined is_empty() early-out with the
  non-empty body marked #[cold].

* Codegen-static timer-machinery elide: when chart has no Duration
  triggers, every TimerTable call is omitted from step() and
  exit_state(). step() returns None directly. dispatch_trigger and
  the timer-fired arms remain but are unreachable; LLVM DCEs them.

* TimerEntry.remaining_ns: u128 -> u64 (~584-year ceiling). Halves
  entry size; replaces u128 saturating-sub with u64. The smaller
  machine struct improves cache density on every bench, even
  timer-free ones.

Bench coverage: four new benches added to cover paths the original
suite missed -- bubble_leaf/mid/top (handler resolution at varying
ancestor depths), timer_fire_dispatch (only bench exercising
pop_expired's non-empty branch and dispatch_trigger), terminate_event
(only bench exercising do_terminate), bubble_cross_tree (deep bubble
+ 10-state cross-tree, the realistic HSM worst case).

See hsmc/benches/baseline.txt for the per-pass delta blocks and
docs/003. latency-analysis.md sections 1, 9, and 12 for the
cost-surface analysis.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
 2026-04-28 18:51:21 -06:00
swaitsandClaude Opus 4.7 e633f5dc55 perf: O(H) lca() depth-walk + dispatch bench scoreboard 
The runtime `lca()` helper used a `heapless::Vec<u16,32>` ancestry-set
with a linear `contains()` per node — O(H²) and capped at H ≤ 32. The
codegened `__DEPTH` table already had everything needed for an O(H)
depth-walk with no allocation and no hierarchy ceiling. Switch to that.

Also adds an iai-callgrind dispatch bench harness (Linux-only dev-dep)
so future optimizations can be measured deterministically by instruction
count. Seven benches cover: cold start, lateral H=2/4/8, up, self, and a
self-emit chain. Baseline numbers checked in at `hsmc/benches/baseline.txt`.

The latency analysis (`docs/003. latency-analysis.md`) is rounded out
with event-entry-point and cooperative-driving audits — three new
sections documenting the four event injection paths, the run-loop's
cooperative shape, and three correctness invariants (sticky overflow
flag, biased-select trap, cancel-safety on durings).

Bench deltas (cargo bench --bench dispatch -- --baseline=pre_lca_fix):

  h2_cold_start        -1.9%  /  -0.3%   (priming step, no lca() — noise)
  h2_warm_lateral     -22.8%  / -22.1%
  h4_cross_tree       -25.9%  / -10.6%
  h4_up                +1.0%  /  +0.4%   (up-transition, no lca() — noise)
  h4_self             -21.5%  / -11.7%
  h8_cross_tree       -46.2%  / -41.0%   ← headline: deepest LCA stress
  chain_self_emit     -15.4%  / -10.4%

Improvement scales with hierarchy depth, exactly as the O(H²) → O(H)
algorithmic change would predict.

All tests pass under --no-default-features, --features tokio, and
--features embassy.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
 2026-04-28 16:58:53 -06:00
swaits 4ea7463089 feat(observe)!: unify journal and trace into single observation pipeline 
The codegen now emits one `__chart_observe!` invocation per observable
atom. The macro fans out at compile time to whichever sinks are enabled:
the in-memory journal (`feature = "journal"`), `defmt` (`trace-defmt`),
`log` (`trace-log`), and/or `tracing` (`trace-tracing`). Trace and
journal share the same vocabulary by construction — they cannot
diverge. With no sink feature on, every site expands to `()` (zero
overhead). Multiple trace backends now compose; previously they were
mutually exclusive.

Trace lines use a logfmt-style format with a `[statechart:Name]` prefix
and `key=value` pairs, machine-parseable and greppable. Twenty verbs
cover every observable atom — entries/exits with begin/end pairs,
actions with kind, durings, transitions with the reason that triggered
them, event lifecycle (received/delivered/dropped/queued/failed),
timers, and termination.

BREAKING CHANGES (chart syntax unchanged; observability surface only):

- `TraceEvent::TransitionFired` now carries `reason: TransitionReason`
  showing whether the transition was driven by an event, a timer, or
  internal logic.
- New `TraceEvent` variants for phase pairing: `EnterBegan`, `ExitBegan`,
  `TransitionComplete`, `EventReceived`.
- Trace prefix changed from `[Name]` to `[statechart:Name]`.
- The chart-level `trace;` keyword is parsed for backwards compatibility
  but no longer gates emission.
- `__chart_trace!` / `__chart_journal!` macros removed (doc-hidden).

Verification: 159 integration tests pass, 0 missed mutants, miri 68
tests clean, Creusot 14/14 VCs discharged. Zero overhead confirmed via
`cargo expand` — every observation site expands to `{}` with no sinks
enabled.
 2026-04-28 15:24:14 -06:00
swaits a6d6cd2674 chore(release): 0.3.0 
Bump workspace version 0.2.0 → 0.3.0.

CHANGELOG: documents the additions in this release —
  - `journal` Cargo feature with full TraceEvent enum + machine API
  - root state targetable by chart name
  - 113 deterministic-flow tests
  - verification/ workspace member with mechanical Creusot proofs
  - docs/002 formal semantics doc
  - README "How a chart behaves" building-block section
  - mise + just tooling overhaul (set shell, set script-interpreter)

README: integrates the semantics from docs/002 as eight building-
block rules that build on each other (active path, default-descent,
event bubbling, transitions, up-transition rule, entry/exit
ordering, timer lifecycle, emit / during / termination). Adds an
explicit "what hsmc deliberately does NOT have" table with what to
use instead. New "Verification" section pointing at `just verify`.

No behavior changes for v0.1 / v0.2 charts — every existing chart
compiles unchanged.
 2026-04-27 21:32:22 -06:00
swaits e183cdd95e feat(verify): discharge Creusot VCs end-to-end 
Make `just verify` actually invoke Why3 + alt-ergo + z3 against every
Pearlite VC, and fix the mutant + miri pipelines along the way.

Verification crate
  - Drop the const-generic CAP types for EventQueue / TimerTable.
    Mirror with std::vec::Vec, whose creusot-std specs carry the
    proof burden. Capacity behavior is exercised by the runtime's
    own unit tests + correspondence tests.
  - View impls are #[logic(open)] over a pub field so contracts on
    push/pop/etc. can see the link to the inner Vec's @ view.
  - 14/14 VCs discharge: EventQueue {new, push, pop, is_empty, len,
    clear, Default}; TimerTable {new, len, is_empty, Default};
    Entry derives.
  - `cargo creusot prove --no-cache` always runs the SMT solvers;
    `time` shows ~7s CPU on ~1.2s wall-clock = real parallel work.

Tooling
  - verification/mise.toml pins nightly-2025-11-13 + rust-src,
    rustc-dev, llvm-tools-preview, rustfmt; declares opam, python,
    uv, and the project-local .venv. Inherits root mise.toml's just
    + cargo-* tools.
  - just verify clones creusot v0.9.0 to ~/.local/share/hsmc-verify/
    and runs the canonical ./INSTALL — that's the only way the
    bundled prelude-generator + creusot-rustc actually build.
  - just verify --no-cache forces SMT re-runs every time.
  - Drop bespoke pin/install of cargo-creusot from mise.toml; the
    cargo backend goes through cargo-binstall which can't pin a
    multi-bin git workspace at a tag.

Mutants — was missing every JournalSink mutant
  - Recipe runs with --features tokio,journal so journal_* and det_*
    tests (gated on both) actually execute.
  - Add clear_journal_empties_the_journal test in journal_smoke.rs
    to kill the JournalSink::clear with-() mutant.
  - Remove dead JournalSink::len + is_empty (called nowhere; only
    existed as mutation-bait).
  Result: 0 missed, 42 caught, 211 unviable (proc-macro emitted
  code that mutants can't standalone-compile).

Miri — was hitting the trybuild glob isolation issue
  - --exclude hsmc-macros (trybuild ui test isn't UB-relevant)
  - --exclude hsmc-verification (different pinned toolchain)
  - 66 tests pass under Miri, 0 UB.

Gitignore
  - /verif/, /why3find.json, /.why3find/, **/.venv/ — all
    regenerated by `just verify`. Repo stays clean of per-machine
    prover timings + venv artifacts.

Misc
  - Fix root-state targetability: `on(Trig) => <ChartName>;` resolves
    to root id 0 in both ir.rs::resolve_transitions and
    validate.rs's separate name_map.
  - `set shell` and `set script-interpreter` route every justfile
    recipe through `mise exec`, so all subshells see the right
    Rust + opam + cargo-* tools regardless of how `just` was
    invoked. No shebangs anywhere.
 2026-04-27 21:22:44 -06:00
swaits 081bd28cca journal + determinism tests + Creusot verification scaffolding 
Phase 1 — semantics doc
  docs/002. hsmc-semantics-formal.md

Phase 2 — deterministic execution journal
  hsmc/src/journal.rs (TraceEvent, JournalSink, ActionKind)
  hsmc-macros: __chart_journal! emission at every observable site
    (entry/exit/action/transition/timer arm-cancel-fire/during/emit/
    event delivery/terminate). Per-state during count helpers, stable
    chart-hash via FNV-1a. Action observation moved out of run_action
    and into call sites so ActionKind is accurate.
  Public API on the generated machine: journal(), take_journal(),
    clear_journal(), CHART_HASH.

Phase 3 — verification crate (Creusot scaffolding)
  verification/{Cargo.toml,mise.toml,requirements.txt,INVARIANTS.md}
  verification/src/{event_queue.rs,timer_table.rs} — Pearlite
    contracts on simplified mirrors of the runtime types. cargo
    creusot generates Coma IR cleanly; VCs not yet discharged.
  Correspondence tests drive the verified mirror and the runtime
    type with the same op sequences and assert observable parity.

Tests — 113 deterministic-flow tests across 22 files. Each compares a
  hand-built expected journal byte-for-byte against actual, anchored
  to a spec section: initial entry, lateral/self/up transitions,
  bubbling, timers, emit, ordering, durings, step/dispatch
  equivalence, root-targeting, current_state, termination.

Tooling — mise.toml (root): stable Rust + cargo subcommands.
  verification/mise.toml: pinned nightly-2025-11-13 + opam + python
  venv + uv. just verify is fully self-installing.

Bug fix — root state targetable by the chart's own name (e.g.
  `on(Trig) => ChartName;`) per spec §"How transitions work".

CHART_HASH — stable FNV-1a fingerprint over the chart's structural
  definition; mismatch on replay = different chart.
 2026-04-27 20:15:05 -06:00
swaits 4d7baf7236 fix!: up-transitions no longer exit and re-enter the target ancestor 
A transition whose target is already active (an ancestor of the
innermost active state) now unwinds only the subtree strictly below
the target. The target's entry/exit actions do not fire and its
default() does not re-descend — you cannot re-enter a state you never
left. The old behavior could loop infinitely when a child transitioned
to its own parent.

Self-transitions (target == innermost) and lateral transitions are
unchanged. See spec §2.6 and tests §T2.8 / T2.8b / T2.8c.

Also in this release:

* Full workspace justfile (check, test, coverage, mutants, pre-release)
* Unit tests covering all __private internals; `cargo mutants` now exits
  clean (38 caught, 178 unviable, 0 missed, 0 timeouts).
* .config/nextest.toml with slow-timeout/terminate-after so hung tests
  fail fast rather than wedging cargo-mutants runs.

BREAKING CHANGE: transition-to-ancestor semantics. Machines that relied
on the old re-entry behavior of up-transitions will observe different
exit/entry action sequences.
 2026-04-22 18:22:04 -06:00
89 changed files with 14430 additions and 2521 deletions
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.config/nextest.toml
+8
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@@ -0,0 +1,8 @@
# Kill any single test that runs longer than 15s. The machine tests use
# `run()` loops that rely on the timer subsystem progressing — when a
# mutation breaks timer semantics a test can spin forever. Without a
# terminate-after budget the whole `cargo mutants` run is scored TIMEOUT
# instead of CAUGHT even when unit tests have already flagged the bug.
[profile.default.slow-timeout]
period = "5s"
terminate-after = 3
.gitignore
+22
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@@ -2,6 +2,28 @@
/target
**/target/
# Tooling output (coverage, mutation testing, profiling, mise cache)
/coverage/
/mutants.out/
/mutants.out.old/
mutation_history.json
*.profraw
# Creusot output: cargo-creusot dumps `.coma` (Coma IR) files here for
# Why3 to read. Regenerated on every `just verify` run.
/verif/
# Creusot/why3find config — `cargo creusot init` regenerates with
# defaults appropriate to the local prover install. The `profile`
# section caches per-machine prover timings that aren't portable.
# `just verify` regenerates if missing.
/why3find.json
# why3find's per-run cache directory.
/.why3find/
# Project-local Python venv created by mise's `_.python.venv` config.
**/.venv/
# Local Claude Code config (per-host overrides)
.claude/settings.local.json
CHANGELOG.md
+486
View File
@@ -4,6 +4,492 @@ All notable changes to this workspace are documented here. The format
follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and
this project adheres to [Semantic Versioning](https://semver.org/).
## 0.6.0 — 2026-05-04
Performance pass on the dispatch hot path + a fully-audited bounded
`unsafe` surface in the generated code. The bench harness moves from
`iai-callgrind` to `gungraun` (the renamed continuation, since
iai-callgrind is frozen at 0.16.1).
### Performance
Two optimization passes land. Bench impact (instruction counts vs.
the post-migration baseline; release-mode, valgrind 3.25.1):
```
before after Δ
h2_cold_start 131 24 -82%
h2_warm_lateral 119 53 -55%
h8_cross_tree 97 53 -45%
bubble_cross_tree 120 85 -29%
h4_cross_tree / h4_self 128 93 -27%
bubble_leaf/mid/top 129 94 -27%
h4_up 114 88 -23%
terminate_event 68 53 -22%
timer_fire_dispatch 221 175 -21%
chain_self_emit 500 439 -12%
```
- **`get_unchecked` on codegen-emitted dispatch tables.** `__DISPATCH`,
`__DEFAULT_CHILD`, `__PATH_RANGE`, `__PATH_DATA`, `__TERMINATE_RANGE`,
and `__TERMINATE_DATA` are all indexed by codegen-produced state ids
whose bounds are guaranteed at codegen time. Replacing the
bounds-checked `[idx]` / `[s..e]` forms with `slice::get_unchecked`
unlocks aggressive inlining beyond what plain bounds-check elision
would buy: `apply_path` inlines into `step()` for h2 / h4 / h8 /
bubble; `step()` itself inlines into the bench wrapper for
h2_cold_start / h2_warm_lateral / h8_cross_tree. The cold-path enter
chain on h2_cold_start collapses to a single `u16` store.
- **`pop_expired_nonempty` inlining.** The `#[cold]` attribute was
forcing the body out-of-line at every step()-with-timers call site,
paying full x86_64 ABI prologue/epilogue (~10–15 instructions) per
call. Drop `#[cold]` and add `#[inline]` so LLVM folds it into the
codegen-emitted timer-pop block. As a knock-on effect, `run_handlers`
also inlines into `step()` on the timer path.
### Bounded `unsafe` in generated code (was: "no `unsafe`")
The performance work introduces six bounded `unsafe { get_unchecked }`
blocks per generated chart. User code (chart definitions, action
bodies, `during:` blocks, public API surface) remains `unsafe`-free.
The README and spec rule 12 are updated to reflect this honestly. The
audit story is documented end-to-end in
[`docs/004. unsafe-safety-contract.md`](docs/004.%20unsafe-safety-contract.md);
a short summary:
- **Compile-time const-eval.** Each chart now contains a
`const _: () = { ... };` block that re-states the safety preconditions
as `assert!`s evaluated by `rustc`'s const evaluator at user
`cargo check` time. Any chart whose emitted tables violate the
invariants fails the build with a named diagnostic
(`E0080: evaluation panicked: ...`) before reaching runtime.
- **Runtime `debug_assert!` companions.** Every `unsafe` block has a
paired `debug_assert!` of the same predicate. Free in `--release`;
in dev/test/miri builds, every dispatch through the 68 hsmc behavior
tests exercises the assertions.
- **Miri.** `cargo +nightly miri test -p hsmc` runs 20 unit + 46
behavior tests under the UB interpreter. All clean.
- **Mutation testing.** `cargo mutants` against the safety-relevant
codegen functions: 99 of 101 mutants caught (98%) when run with
`--test-package hsmc --features hsmc/tokio,hsmc/journal`. The 2
remaining are equivalent mutants — transformations that provably
produce identical `__PATH_RANGE` / `__PATH_DATA` output and so
cannot be distinguished by any behavior test (formal analysis in
the safety contract doc).
- **Creusot-verified validator.** `verification/src/paths.rs` carries
Pearlite-annotated functions that decide the safety predicates for
arbitrary inputs; their `#[ensures(... forall ...)]` clauses pin the
universal property the const-eval block evaluates per chart.
`correspondence_paths.rs` includes a test that directly compares the
validator and the const-eval block's predicate expression on
representative and adversarial inputs.
`just safety` runs the const-eval, debug_assert, miri, and mutants
phases as one command and mirrors the audit matrix in
`docs/004. unsafe-safety-contract.md`. `just verify` discharges the
Creusot VCs.
### Bench harness migration: `iai-callgrind` → `gungraun`
`iai-callgrind` on crates.io is frozen at 0.16.1; the project has been
renamed to `gungraun` (same maintainers, same valgrind backend, same
callgrind output format — `github.com/iai-callgrind/iai-callgrind`
redirects to `github.com/gungraun/gungraun`). Migration is mechanical:
- `Cargo.toml` dev-dep: `iai-callgrind = "0.16"` → `gungraun = "0.18"`
- `mise.toml`: replace the `iai-callgrind-runner` install with
`cargo:gungraun-runner`
- benchmark source: `use iai_callgrind::...` → `use gungraun::...`
(macro names identical: `library_benchmark`, `library_benchmark_group`,
`main!`)
- output dir: `target/iai/...` → `target/gungraun/...`
- environment variables: `IAI_CALLGRIND_*` → `GUNGRAUN_*`
Absolute instruction counts shifted slightly between the two harnesses
because gungraun's bench wrapper instruments a few more setup/teardown
instructions per bench (~+4–5 per bench, all in harness, none in HSM).
The historical iai-callgrind numbers are kept in
`hsmc/benches/baseline.txt` for reference but the post-migration
`gungraun_initial` is the comparison point going forward.
### Documentation
- New: `docs/004. unsafe-safety-contract.md` — full inventory of the
six unsafe blocks, the invariants they rely on, and the five-layer
audit (const-eval, debug_assert, miri, mutants, Creusot validator).
- Updated: `docs/000` rule 12 — was "no unsafe in generated code", now
"bounded unsafe in generated code, none in user code" with a pointer
to docs/004.
- Updated: `verification/INVARIANTS.md` — new "Path tables" section
with five spec rows for the path-table predicates. Phase 4 (universal
proof of `compute_transition_paths`) reclassified as Phase 5 since
the per-chart const-eval + verified validator is operationally
equivalent for end users.
- Updated: README — replaces the bare "no `unsafe`" claim with an
honest one-paragraph summary pointing at docs/004; install snippets
bumped to `version = "0.6"`.
- New: `just safety` recipe wires up the full unsafe-audit matrix.
## 0.5.1 — 2026-04-29
Docs and licensing cleanup. No code or behavior changes.
- **License simplified to MIT.** The crate was previously dual-licensed
MIT OR Apache-2.0; it is now MIT-only. `LICENSE-APACHE` removed,
`LICENSE-MIT` renamed to `LICENSE`, workspace `license` field is
now `"MIT"`. Copyright (c) 2026 Stephen Waits &lt;steve@waits.net&gt;.
- **README rewritten reader-first.** Restructured top-to-bottom so a
reader who's never used statecharts can follow the document linearly:
a working Blinker chart is now the first concrete artifact; the
Quickstart sits directly under it; the larger Radio example
(events / payloads / `during:`) follows; the formal eight-rule
semantics live below all of that as reference rather than as a
prerequisite. The "What it does" feature list is rewritten in
user-benefit-first language. The "What `hsmc` deliberately does NOT
have" table is promoted from a sub-section to its own top-level
section. No semantic changes — the formal rules' content is
untouched, only repositioned.
- **Tokio integration story corrected.** The README previously implied
driving a chart under tokio required `tokio::task::LocalSet`. The
normal path is `#[tokio::main(flavor = "current_thread")]` — one
line, no extra wrapping, and how the existing examples have always
worked. `LocalSet` no longer appears in the README at all.
- **`microwave_tui` example dropped.** The ratatui/crossterm TUI
variant of the microwave was overkill for a library example and
pulled in three dev-dependencies (`ratatui`, `crossterm`, `futures`)
that nothing else used. The `microwave` example covers the same
feature surface in plain Rust.
- **Observability framed honestly.** Enabling `defmt` / `log` /
`tracing` output for a chart is one `trace-*` Cargo feature on
hsmc's side, plus whatever your downstream crate already does to
init its logger (e.g. `tracing_subscriber::fmt::init()` or
`env_logger::init()`) — hsmc deliberately doesn't init a logger,
per the standard Rust library convention. The Observability
section now says so directly and includes a runnable end-to-end
snippet using `tracing-subscriber`. The `trace-*` features are
also listed in the main feature-flags table so they're
discoverable at a glance.
- **Inline examples corrected.** The Quickstart Blinker now has both
`light_on` and `light_off` actions (it previously had only
`light_on`, which left the LED on the whole time). The Embassy
snippet no longer declares an unused event channel for what is a
timer-only chart.
- **Eight-rule order finalized.** The "How a chart behaves" rules are
now strictly bottom-up: active path → transitions (LCA-aware) →
up-transition rule → entry/exit ordering → `default(...)` (a
transition fired on entry) → event bubbling → timers →
emit/during/termination. Cross-references updated.
## 0.5.0 — 2026-04-28
### `default(...)` is a real LCA-aware transition
`default(...)` is now modeled the same way as any event-driven
transition. It fires immediately after the declaring state's entries
finish and its durings start, applying the standard exit-to-LCA /
enter-to-target algorithm. Three behavioral changes follow from this:
- **Optional.** A state with children no longer must declare a
`default(...)`. When omitted, the state itself is the resting
innermost active state; substates are reachable only via explicit
transitions. This is the "microwave Standby" pattern — `Standby`
has substates like `LowPower` you enter only on demand, and
`=> Standby;` lands at `Standby` itself with no descent.
- **Targets anywhere.** The default target may be any state in the
chart — a child (the classic descent case), a sibling, an ancestor,
anywhere. `default(<sibling-or-ancestor>)` exits the just-entered
state as part of the default-fire transition; the same uniform
rule covers descent, redirection, and up-bounce.
- **Cycle-checked at compile time.** The default-edge graph
(out-degree ≤ 1 per node) is rejected if it contains any cycle,
including `default(self)`. The check guarantees default chains
terminate at runtime — entering any state in a cycle would loop
forever before reaching user code.
### Breaking changes
- **Journal format.** Default-fires now emit `TransitionFired` (with
`reason: TransitionReason::Internal`) and `TransitionComplete`
brackets around their entry sequence. `Internal` was previously
reserved and never emitted; it is now active. Charts that
hand-build expected journal sequences (replay-style tests) must
include these brackets around every default-fire — see the
per-test diffs in this release for the pattern.
- **Validation.** Two compile-time errors went away:
`default(<non-direct-child>)` is now valid (the target may be
anywhere), and `default` on a childless state is now valid
(the leaf transitions out immediately on entry). Code relying
on these as guard rails must adapt. A new compile-time error
takes their place: any cycle in the default graph is rejected
with a pinpoint message naming the cycle (e.g.
`default-transition cycle detected: A -> B -> A`).
### Other
- README and `docs/002. hsmc-semantics-formal.md` rewritten so the
default-as-transition framing is the primary description; the old
"automatic transition into a child" language is gone.
- New integration tests covering each branch of the new semantics:
`det_optional_default` (microwave pattern), `det_default_sibling`
(lateral default), `det_default_chained` (multi-link default
chain), `det_default_ancestor` (up-default landing on an
ancestor).
- New compile-fail UI fixtures for cycle detection
(`t9_4_default_self_cycle`, `t9_5_default_two_cycle`) and new
compile-pass fixtures for non-child default targets
(`composite_without_default`, `default_targets_sibling`,
`default_targets_ancestor`).
## 0.4.1 — 2026-04-28
### Performance — dispatch hot path
Six codegen-side optimization passes against `step()` and friends. No
user-facing API changes; all 296 tests pass under `--no-default-features`,
`--features tokio`, `--features embassy`, and `--features tokio,journal`.
Cumulative on `h8_cross_tree` (the deepest dispatch in the bench suite):
**−82% instructions / −72% cycles** vs the pre-`pre_lca_fix` baseline.
See `hsmc/benches/baseline.txt` for per-pass delta blocks and
`docs/003. latency-analysis.md` §1/§9/§12 for the cost-surface analysis.
- **Precomputed transition paths.** For every `(from, to)` state pair,
codegen materializes the exit/enter sequence into a single flat
`__PATH_DATA` blob with a `__PATH_RANGE: [(u16, u16, u16); N²]`
index. `transition()` becomes one indexed range lookup + two slice
loops; the `lca()` runtime helper, `is_up_transition()`, and the
per-call `heapless::Vec<u16, 16>` ancestry build are gone. Up /
self / lateral semantics are baked into the table (empty enter
slice ⇒ up-transition, target excluded; non-empty enter slice
includes the default-descent tail). Hierarchy depth is no longer
bounded by the old 32-state Vec capacity.
- **Precomputed event-dispatch table.** For every `(state, event)`
pair, codegen resolves the handler the runtime `__PARENT` bubble
walk would have found. `__DISPATCH: [(u16, &'static [u16],
Option<u16>); N×E]` stores `(handler_state, action_ids,
transition_target)` per pair; `u16::MAX` in the handler-state slot
is the no-handler sentinel. The runtime walk + per-hop
`__handler_lookup` call in `step()` collapses to one indexed lookup.
Handler resolution is now O(1) regardless of bubble depth — the
`bubble_top` bench (4-hop walk) is now within 3 instructions of
`bubble_leaf` (handler on current state). `__handler_lookup` is
retained for timer dispatch (the `dispatch_trigger` path doesn't
bubble).
- **Precomputed terminate exit path.** Per-state `__TERMINATE_DATA`
table holds the full exit chain up to and including `__Root` (which
may carry root-level `entry:`/`exit:` actions). `do_terminate()`
indexes the table once and iterates the slice, replacing the
runtime `__PARENT` walk + per-iteration match. Queue drain switched
from `while pop_front().is_some()` to `Deque::clear()` (heapless
0.8 implements this as O(1) — resets indices instead of popping
each entry). `terminate_event` bench: −22.5% instr / −23.4% cycles.
- **TimerTable empty-skip.** `pop_expired`, `min_remaining`,
`decrement`, and `cancel_state` each get `#[inline]` + an
`is_empty()` early-out, with the non-empty body split into a
`#[cold]` helper. Runtime branch on charts with timers; the body
stays out-of-line.
- **Codegen-static timer-machinery elide.** When a chart declares no
`Duration` triggers (the common case for event-driven HSMs), every
`TimerTable` call is omitted from `step()` and `exit_state()` at
codegen. `step()` returns `None` directly for the next-tick
deadline. `dispatch_trigger()` and the timer-fired arms remain in
the binary but are unreachable; LLVM DCEs them.
- **`TimerEntry.remaining_ns: u128 → u64`.** Internal-only field type
change. u64 nanoseconds bounds at ~584 years — comfortably past any
realistic `Duration`. Eliminates u128 saturating-sub in
`decrement()` (4–6 instructions per entry → 1–2) and the manual
secs/nanos decomposition in `min_remaining()` (replaced with
`Duration::from_nanos`). The struct shrinks 32 B → 16 B with
alignment, so the entire machine struct gets smaller — every bench's
RAM-hit count drops from tighter cache packing.
### Bench coverage
Four new benches added to cover hot paths the original suite missed:
- **`bubble_leaf` / `bubble_mid` / `bubble_top`** — handler resolution
at varying ancestor depths (0 / 3 / 4 hops) on a single chart.
Quantifies the bubble-walk cost as a function of distance, and
confirms the `__DISPATCH` table makes resolution depth-independent.
- **`timer_fire_dispatch`** — only bench that exercises
`pop_expired`'s non-empty branch and `dispatch_trigger`. The most
expensive single-step bench in the suite (191 instr / 706 cycles).
- **`terminate_event`** — only bench exercising `__check_terminate`'s
true arm and `do_terminate`. 69 instr / 311 cycles.
- **`bubble_cross_tree`** — handler on L1 (4 bubble hops up from
current=L5) targets R5 in a sibling subtree (10-state cross-tree
transition). Realistic HSM worst case; 94 instr / 444 cycles —
almost the same as a plain 7-deep cross-tree because both bubble
resolution and transition path are now O(1) lookups.
## 0.4.0 — 2026-04-28
### Changed — observability (breaking)
- **Unified observation pipeline.** The codegen now emits a single
`__chart_observe!` invocation per observable atom, dispatched at
compile time to whichever sinks are enabled: the in-memory journal
(`feature = "journal"`), `defmt` (`trace-defmt`), `log`
(`trace-log`), and/or `tracing` (`trace-tracing`). All sinks share
the same vocabulary by construction — the journal IS the observation
stream; trace backends are textual renderings of it. With NO sink
feature on, every call site expands to `()` (zero overhead). Multiple
trace sinks may now be enabled simultaneously (previously they were
mutually exclusive).
- **Trace prefix changed.** `[ChartName] verb …` →
`[statechart:ChartName] verb …`. The new form is greppable and
unambiguous in mixed log streams.
- **Trace format is now logfmt-style.** Every line is
`[statechart:Name] <verb> key=value key=value …` (or native structured
fields under `tracing`). Twenty verbs cover every TraceEvent variant
— entries, exits (with begin/end pairs), actions (with kind),
durings, transitions (with **reason** showing what triggered them),
events (received/delivered/dropped/queued/failed), timers, terminate.
- **`trace;` keyword deprecated.** Still parsed for backwards
compatibility, but no longer gates emission. Trace output is now
controlled purely by which `trace-*` cargo feature you enable.
### Changed — journal (breaking)
- **`TraceEvent::TransitionFired` carries `reason: TransitionReason`.**
Replay consumers now see whether a transition was driven by an event
(`Event { event: u16 }`), a timer (`Timer { state, timer }`), or
internal logic (`Internal`).
- **New TraceEvent variants for phase begin/end pairing.**
- `EnterBegan { state }` fires before a state's entry actions /
timers / durings; `Entered` keeps its place as the end marker.
- `ExitBegan { state }` fires before a state's during cancellations
/ timer cancellations / exit actions; `Exited` keeps its place as
the end marker.
- `TransitionComplete { from, to }` fires after a transition's full
exit-then-enter sequence finishes; pairs with `TransitionFired`.
- `EventReceived { event }` fires when an event is popped from the
queue, before handler search; pairs with `EventDelivered` /
`EventDropped` / `TerminateRequested`.
### Added
- **`hsmc/tests/trace_format.rs`** — 11 tests pinning every verb's
exact textual rendering, including a journal/trace atom-count
equivalence test.
- **`TransitionReason`** enum — re-exported from the crate root when
`feature = "journal"` is on. Carried on `TraceEvent::TransitionFired`.
- **Multiple trace backends compose.** Previously enabling more than
one of `trace-defmt` / `trace-log` / `trace-tracing` was a compile
error. Now they fan out independently.
### Migration
Chart syntax is unchanged: every v0.1 / v0.2 / v0.3 statechart compiles
under v0.4 without modification. Breakage is confined to the
observability surface area:
1. **Trace line prefix.** Update grep patterns and log filters from
`[ChartName]` to `[statechart:ChartName]`. The verb after the
prefix is now a single hyphenated token followed by `key=value`
pairs.
2. **`TraceEvent::TransitionFired`** has a new `reason` field. Update
pattern matches:
```rust
// before:
TraceEvent::TransitionFired { from, to } => …
// after:
TraceEvent::TransitionFired { from, to, reason } => …
// or, if you don't care:
TraceEvent::TransitionFired { from, to, .. } => …
```
3. **New `TraceEvent` variants.** If you `match` exhaustively, add
arms for `EnterBegan`, `ExitBegan`, `TransitionComplete`,
`EventReceived`. Otherwise nothing changes.
4. **`trace;` keyword is now a no-op.** Charts that declared it still
compile. Trace output is now controlled purely by which `trace-*`
cargo feature you enable.
5. **`__chart_trace!` and `__chart_journal!` macros are removed.**
These were doc-hidden and not part of the public API; mentioned
here for codebases that grepped through the macro emission for
patches/forks.
## 0.3.0 — 2026-04-27
### Added
- **`journal` Cargo feature.** Records every observable atom of chart
execution — `Started`, `Entered`, `Exited`, `ActionInvoked`
(`Entry`/`Exit`/`Handler`), `DuringStarted`, `DuringCancelled`,
`TransitionFired`, `EventDelivered`, `EventDropped`, `EmitQueued`,
`EmitFailed`, `TimerArmed`, `TimerCancelled`, `TimerFired`,
`TerminateRequested`, `Terminated` — into a `Vec<TraceEvent>` on the
generated machine. Same chart + same events = byte-identical
journal. Public API: `journal()`, `take_journal()`, `clear_journal()`,
`CHART_HASH` (a stable FNV-1a fingerprint of the chart's structural
definition).
- **Root state targetable by chart name.** `on(Trig) => MyChart;`
resolves to the root state in both `classify_target` and
`resolve_transitions`. From any nested state this is an
up-transition (root is always on the active path).
- **113 deterministic-flow tests** (under `--features tokio,journal`)
comparing hand-built expected journals byte-for-byte against
actual, anchored to spec sections: initial entry, lateral / self /
up transitions, default-descent, event bubbling, timer arm /
cancel / fire, emit, ordering, durings, step-vs-dispatch
equivalence, root-targeting, `current_state()`, termination.
- **`verification/` workspace member with Creusot proofs.** Verified
mirrors of the runtime `EventQueue` and `TimerTable` carry
`creusot-std` (Pearlite) contracts that Why3 + alt-ergo + z3
discharge mechanically. 14/14 VCs proven. `just verify` is
self-installing (mise pulls opam + the pinned nightly + Creusot's
canonical `INSTALL`).
- **`docs/002. hsmc-semantics-formal.md`** — canonical, unambiguous
reference for chart behavior. Numbered S-rules supersede the v0.1
prose spec and v0.2 design-change-request.
- **README "How a chart behaves" section** — eight building-block
rules that build on each other, with an explicit "what hsmc
deliberately does NOT have" table.
### Tooling
- `mise.toml` (root) declares stable Rust + components + embedded
targets + cargo subcommands. `verification/mise.toml` declares
the pinned `nightly-2025-11-13` + opam + python venv + uv.
- `set shell` and `set script-interpreter` route every `just` recipe
through `mise exec` — no shebangs, no per-recipe wrappers.
- `just verify` runs `cargo creusot prove --no-cache` so SMT
invocations happen on every run; `time` shows ~7s CPU on ~1.2s
wall = real parallel work.
- `just mutants` runs with `--features tokio,journal` so `journal_*`
and `det_*` tests execute. **0 missed mutants.**
- `just miri` excludes `hsmc-macros` (trybuild glob hits Miri's
isolation) and `hsmc-verification` (different pinned toolchain).
66 tests pass under Miri, 0 UB.
### Backward compatibility
Every v0.1 / v0.2 statechart compiles under v0.3 unchanged.
## 0.2.0 — 2026-04-22
### Fixed — behavior-visible (breaking)
- **Up-transitions no longer exit and re-enter the target ancestor.**
A transition whose target is already active (i.e., the target is on
the path from root to the innermost active state, and the target is
not itself the innermost) now unwinds only the subtree strictly
below the target. The target's `exit:` / `entry:` actions do NOT
fire, and its `default(...)` does NOT re-descend. You cannot
re-enter a state you never left. The old semantics (exit target,
re-enter, re-descend to default) was incorrect and could produce
infinite re-entry when a child transitioned to its own parent.
See spec §2.6, §T2.8, §T2.8b, §T2.8c.
- Self-transitions (`target == innermost`) are unchanged: the target
is still exited and re-entered, timers still restart.
- Lateral transitions (target not on the active path) are unchanged.
- `current_state()` may now return a composite state when it became
innermost via an up-transition.
## 0.1.0 — 2026-04-22
Initial release.
Cargo.lock
Generated
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View File
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Cargo.toml
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LICENSE-APACHE
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README.md
+454 -143
View File
@@ -1,10 +1,98 @@
# hsmc — Hierarchical State Machines for Rust
`hsmc` is a declarative, proc-macro-based statechart crate for Rust. It targets
embedded Rust (embassy) as the primary runtime and supports `tokio` via
`LocalSet`. Machines are compiled from a `statechart!` block into
monomorphized code with no dynamic dispatch, no interior mutability, and no
heap allocations by default.
`hsmc` lets you write the control logic of a device — a microwave, a
LoRa radio, a sensor, a UI flow — as a **statechart**: nested states
with entry/exit actions, transitions, timers, and async work, all
declared in one block. The proc macro turns it into Rust code with no
heap allocations, no dynamic dispatch, and no interior mutability.
It targets embedded Rust on `embassy` first, with full tokio support
on the side. Same chart, both runtimes.
## A first chart — a blinker
```rust
use hsmc::{statechart, Duration};
pub struct Ctx {
pub on: bool, // mirrors the LED's current state
pub blinks: u32, // count of times we've turned it on
}
statechart! {
Blinker {
context: Ctx;
default(Off); // start with the LED off
state Off {
entry: light_off;
on(after Duration::from_millis(500)) => On;
}
state On {
entry: light_on;
on(after Duration::from_millis(500)) => Off;
}
}
}
impl BlinkerActions for BlinkerActionContext<'_> {
async fn light_off(&mut self) { self.on = false; }
async fn light_on(&mut self) { self.on = true; self.blinks += 1; }
}
```
Two states, two timer-driven transitions, two entry actions. The
runtime arms each state's timer when you enter it and cancels it
when you leave; `default(Off)` picks the initial state. Land in
`Off`, fire `light_off`, arm the 500 ms timer; when it elapses,
transition to `On`, fire `light_on`, arm the next 500 ms timer.
Repeat.
That's `hsmc` at its smallest: states, timers, and one entry action
per state. No event channel, no async I/O, no hierarchy yet.
## Quickstart
Add to `Cargo.toml`:
```toml
[dependencies]
hsmc = { version = "0.6", features = ["embassy"] } # firmware
# or
hsmc = { version = "0.6", features = ["tokio"] } # desktop / tests
```
Run the Blinker under tokio:
```rust
#[tokio::main(flavor = "current_thread")]
async fn main() {
let mut m = Blinker::new(Ctx { on: false, blinks: 0 });
let _ = m.run().await;
}
```
That's the whole driver. A chart runs on a single task — `flavor =
"current_thread"` keeps tokio out of the multi-threaded scheduler so
you don't have to think about `Send` bounds on your context, your
events, or your `during:` futures. Normal Rust, no extra wrapping.
Run it under embassy:
```rust
#[embassy_executor::task]
async fn blink_task() {
let mut m = Blinker::new(Ctx { on: false, blinks: 0 });
let _ = m.run().await;
}
```
## A bigger chart — events, payloads, async I/O
The Blinker doesn't talk to anything outside itself. A real device
does. Here's a radio that receives commands from somewhere
(button press, RPC call, ISR), continuously listens for packets while
in the `Receiving` state, and stops when told:
```rust
statechart! {
@@ -25,79 +113,228 @@ statechart! {
}
```
## What it does
Three things here that the Blinker didn't have:
- **Harel-style hierarchical states.** Nested states with `entry:`/`exit:`
actions, LCA-aware transitions, default-child descent, `terminate`.
- **Event-driven transitions and actions.** Typed payload bindings:
`on(PacketRx { rssi: i16 }) => handler;`.
- **Timer triggers.** `on(after Duration::from_secs(5)) => Next;` and
`on(every Duration::from_millis(100)) => tick;`.
- **`during:` activities.** Async functions that run while a state is
active and produce events. Multiple durings can borrow disjoint fields
of the context concurrently via Rust's native split borrow — no
`RefCell`, no `Mutex`, no `UnsafeCell` in user code.
- **`m.run().await` is the whole task body.** Races active durings, the
external event channel, and timer deadlines. The MCU sleeps between
events (embassy's cooperative executor parks all futures).
- **Backward-compatible.** Every v0.1 statechart compiles under v0.2
unchanged.
- **Events.** `events: Ev;` declares the input enum. External code
drives the chart with `m.sender().send(Ev::StartRx)`; in-chart
actions can `emit(Ev::Whatever)` to queue a follow-up. Handlers
pattern-match the variant and bind its payload directly:
`on(PacketRx { rssi, snr }) => record_packet;` makes `rssi` and
`snr` available to the action.
- **`during:` activities.** `next_packet(lora, rx_buf)` is an async
fn that runs while `Receiving` is active and is dropped when the
state exits. It gets `&mut` borrows of just the `lora` and
`rx_buf` fields of the context — Rust's split-borrow rules let
several `during:`s on the active path run concurrently without a
`RefCell` or `Mutex` in sight.
- **The runtime races them all.** `m.run()` simultaneously polls the
`during:`, listens on the event channel, and waits for the next
timer deadline; whichever fires first drives the next transition.
The MCU sleeps in between.
## Quickstart
For nested-state hierarchies, `emit(...)`, `terminate`, and
`on(every D)`, see the [microwave example](hsmc/examples/microwave.rs).
Add to `Cargo.toml`:
## What you get
```toml
[dependencies]
hsmc = { version = "0.2", features = ["embassy"] } # or ["tokio"]
- **Nested states with proper transitions.** Exit a deeply nested
state and every enclosing state's exits run in the right order, no
manual bookkeeping. A transition is just `=> Target;` and the
runtime walks the tree (LCA dispatch). Includes `entry:`/`exit:`
actions, optional `default(...)` initial transitions, and
`terminate`.
- **Events with typed payloads.** Pattern-match a variant and bind
its fields right in the chart: `on(PacketRx { rssi: i16 }) =>
record_packet;`. The compiler type-checks the binding against your
event enum.
- **Timers as first-class triggers.** `on(after 5s) => Next;` for a
one-shot, `on(every 100ms) => tick;` for periodic. Armed when the
declaring state is entered, cancelled when it's exited — no
`select!` plumbing in your code.
- **Async work scoped to a state's lifetime.** A `during:` is an
async fn that runs while a state is active and is dropped when you
leave. Multiple durings on the active path race concurrently and
split-borrow disjoint context fields — no `RefCell`, no `Mutex`,
no `unsafe` in your code.
- **`m.run().await` is the whole task.** It races durings, the event
channel, and timer deadlines, and parks the executor between them.
No manual loop, no busy-waits, no `Send` headaches under
`current_thread` tokio or embassy.
- **Observability that's one feature flag away.** Add
`features = ["trace-log"]` (or `trace-defmt` / `trace-tracing`) and
every action, transition, timer, and event becomes a log line in
whichever framework your crate already uses — `defmt` for firmware,
`log` for desktop, `tracing` for structured spans. With no sink
feature, the observation calls compile to nothing.
- **Deterministic + machine-checked.** The `journal` feature records
every action, transition, timer, and event in order; identical
input produces a byte-identical journal. The runtime's event
queue and timer table are formally verified — Creusot + Why3 +
alt-ergo + z3 discharge the proofs (`just verify`).
- **No heap, no dynamic dispatch.** Pure monomorphized code.
`no_std` clean by default. Designed to fit on a Cortex-M0+ under
embassy. The macro emits six bounded `unsafe { get_unchecked }`
blocks per chart for hot-path table indexing; their preconditions
are checked at build time by const-eval, in dev/test by
`debug_assert!`, and under `cargo +nightly miri test`. Full
inventory and audit in
[`docs/004. unsafe-safety-contract.md`](docs/004.%20unsafe-safety-contract.md).
Your chart, your action bodies, and your durings stay
`unsafe`-free.
## How a chart behaves — the rules
Eight rules, each building on the previous. Internalize these and
every edge case below falls out — you don't have to memorize anything
else.
The full canonical reference lives at
[`docs/002. hsmc-semantics-formal.md`](docs/002.%20hsmc-semantics-formal.md);
this section is the on-ramp.
### 1. The active path — you are in every state from root to the innermost active state
At any moment, the machine is in a **path** of states from the root down
to one innermost active state. If you're in `C` inside `B` inside `A`,
you're **simultaneously** in `Root`, `A`, `B`, and `C`. The root is
always active until termination.
The innermost active state is usually a leaf, but it can also be a
composite that has children but no `default(...)` — see rule 5.
This is the most important rule. Every rule below is downstream of it.
If a behavior somewhere else seems weird, come back here — it's
probably the resolution.
### 2. Transitions — exit to LCA, enter to target
A transition moves the active path from the current innermost state to
some target state. The algorithm is uniform regardless of what
triggered it (event, timer, or default — see later rules):
1. Find the LCA (lowest common ancestor) of current and target.
2. Walk **up** from current, exiting each state, until you hit the LCA.
The LCA itself is **not** exited.
3. Walk **down** from the LCA to target, entering each state. The LCA
is **not** re-entered.
The LCA always exists because root is always an upper bound. State
names are globally unique across the chart, so a transition can target
**any** state — siblings, cousins, ancestors, the root itself
(`on(Trig) => MyChart;`).
### 3. The up-transition rule — never re-enter what you never left
If your transition target is **already on the active path** (i.e., it's
an ancestor of the innermost state), then step 3 of the transition
algorithm does nothing. You exit the states strictly between current
and target; the target itself is **not** re-entered.
So from leaf `C` inside `B` inside `A`, an `on(Up) => A;` exits `C`
then `B`. `A`'s entry actions don't fire. `A`'s timers don't restart.
`A`'s durings keep running.
You cannot enter a state you never left.
### 4. Entry / exit ordering
Direction is set by the path:
- **Entries** fire **outer-to-inner**: when entering down through a
path, the outermost state's entries fire first, then the next, then
the innermost's. Within a single state, entry actions fire in
declaration order. After a state's entries finish, its `during:`
activities start.
- **Exits** fire **inner-to-outer**: innermost first, then parent, then
grandparent. Within a single state, exit actions fire in declaration
order. Before a state's exits begin, its `during:` activities are
cancelled.
So a full transition reads: cancel durings on the way out → run exits
on the way out → run entries on the way in → start durings on the way
in.
### 5. `default(...)` — a transition that fires immediately on entry
Any state **may** declare one `default(...)`. It's a transition — same
LCA-aware algorithm as rule 2 — that fires **immediately** after the
declaring state's entry actions finish (and its durings start). The
target may be **any** state in the chart: a child, a sibling, an
ancestor, anywhere. Defaults chain: if the resulting target also has
a `default(...)`, it fires too, and so on until a state with no
default is reached. The compiler rejects cycles in the default graph,
so the chain is always finite.
The classic case is a composite descending to a leaf:
```
Minimal timer-only machine:
```rust
use hsmc::{statechart, Duration};
pub struct Ctx { pub ticks: u32 }
statechart! {
Blinker {
context: Ctx;
default(On);
state On {
entry: light_on;
on(after Duration::from_millis(500)) => Off;
}
state Off {
on(after Duration::from_millis(500)) => On;
}
}
}
impl BlinkerActions for BlinkerActionContext<'_> {
async fn light_on(&mut self) { self.ticks += 1; }
}
state Root { default(A); state A { default(B); state B {} } }
```
Entering `Root` fires its default → enter `A` → fires its default →
enter `B`. The path lands at `B`.
Drive it under tokio:
```rust
let mut m = Blinker::new(Ctx { ticks: 0 });
tokio::task::LocalSet::new().run_until(m.run()).await.unwrap();
But because `default` is a real transition, you can also redirect:
```
Or under embassy:
```rust
static CHANNEL: Channel<CriticalSectionRawMutex, __NoEvents, 8> = Channel::new();
// (timer-only machines don't need a channel; omit `events:` and use `Blinker::new(ctx)`.)
#[embassy_executor::task]
async fn blink_task() {
let mut m = Blinker::new(Ctx { ticks: 0 });
let _ = m.run().await;
}
state Foyer { default(LivingRoom); } // sibling — entering Foyer
state LivingRoom {} // exits Foyer to LivingRoom
```
Entering `Foyer` fires its default `Foyer → LivingRoom`. LCA = parent of
both; Foyer's exits run, LivingRoom's entries run. Foyer was entered
and exited as part of one tick.
If a state has no `default(...)`, nothing happens after its entries —
the state itself is the resting innermost active state until something
explicitly transitions away. This is the "microwave" pattern: a
`Standby` state with sub-modes that the chart enters only on demand.
A consequence of rule 3 (up-transitions): an ancestor's `default(...)`
only fires when that ancestor is freshly entered. Transitioning *up*
to an ancestor does not re-enter it, so its default does not re-fire.
### 6. Event bubbling — innermost first, first handler wins
An event arrives. Search starts at the **innermost** active state. If
that state has a handler, it runs and the event is consumed (the
handler may execute a transition per rule 2). If not, walk up to the
parent and check there. Repeat. If you reach the root with no handler,
the event is silently discarded.
Three corollaries:
- Innermost shadows ancestor for the same trigger.
- Multiple handlers in one state on the same trigger fire in
declaration order; the transition (if any) fires last.
- **Timers don't bubble.** A timer belongs to the state that declared
it; it fires only in that state's scope.
### 7. Timers — armed by state lifecycle
A timer (`on(after D) => …` or `on(every D) => …`) is **armed** when
its declaring state is entered, **cancelled** when that state is
exited. Descending into a child is _not_ an exit, so the parent's
timers keep running while you're in a child. Re-entering a state
restarts its timers from zero.
### 8. emit / during / termination — all built on the rules above
- **`emit(ev)`** from inside an action queues an event. The runtime
finishes the current event's handling — including every entry/exit
in the resulting transition — **before** dequeuing the new event.
No re-entrant dispatch.
- **`during:`** is an async future tied to its state's lifecycle. It
starts after the state's entry actions finish and is cancelled (the
future is dropped) before the state's exit actions begin. Multiple
durings on the active path race; each borrows disjoint `&mut` fields
of the context (Rust's split-borrow checker enforces this at compile
time).
- **Termination** is just rules 2 + 4 with target = "outside the
chart": exit the entire active path inner-to-outer, then stop.
Pending events drop. In-flight durings drop at their next `.await`.
That's the whole behavior model. The
[full semantics doc](docs/002.%20hsmc-semantics-formal.md)
spells out edge cases (queue overflow surfacing, same-tick timer ties,
self-transitions on composites) but the rules above cover the
overwhelming majority of charts.
## `during:` — async activities scoped to a state
@@ -186,7 +423,7 @@ into a single during that uses `select` internally.
For `statechart! Foo { ... }` the macro emits:
| Item | What it is |
|---------------------------------|----------------------------------------------------------------------|
| -------------------------- | --------------------------------------------------------------------- |
| `FooState` | Enum of every user-declared state. |
| `FooActions` | Trait with one async fn per unique action name. User implements. |
| `FooActionContext<'a>` | Wrapper passed to actions. `Deref`s to the root context. `emit()`. |
@@ -198,7 +435,7 @@ For `statechart! Foo { ... }` the macro emits:
### Machine methods
| Method | Notes |
|-------------------------------------|------------------------------------------------------------------|
| -------------------------------------- | ------------------------------------------------------ |
| `new(ctx)` / `new(ctx, channel)` | Construct. Under embassy, pass an `&'static Channel`. |
| `with_queue_capacity::<N>(ctx,...)` | Custom event-queue capacity. |
| `async fn run()` | Drive the machine to completion (async features). |
@@ -206,7 +443,7 @@ For `statechart! Foo { ... }` the macro emits:
| `fn step(elapsed) -> Option<Duration>` | One unit of work (test/polling driver). |
| `fn send(ev)` | Raw push, non-draining. For tests. |
| `sender() -> Sender` | Clone handle for other tasks / ISRs. |
| `current_state()` | The active leaf state. |
| `current_state()` | The innermost active state. |
| `is_terminated()` | True after `terminate` event. |
| `has_pending_events()` | Queue non-empty. |
| `context()` / `context_mut()` | Borrow the root context. |
@@ -216,109 +453,183 @@ For `statechart! Foo { ... }` the macro emits:
## Feature flags
| Feature | Effect |
|-----------|-------------------------------------------------------------------------|
| --------------- | -------------------------------------------------------------------------- |
| (default) | `no_std`, no async runtime. Drive via `step(Duration)` + `send(ev)`. |
| `tokio` | Async actions + `run()`. Targets single-thread via `LocalSet`. |
| `embassy` | Async actions + `run()`. Targets embassy's cooperative executor. `no_std`.|
| `tokio` | Async actions + `run()`. Single-thread (`flavor = "current_thread"`). |
| `embassy` | Async actions + `run()`. Embassy's cooperative executor. `no_std`. |
| `journal` | In-memory `Vec<TraceEvent>` of every observation (replay, byte-deterministic). |
| `trace-defmt` | Auto-emit `defmt::*` log lines for every observation. |
| `trace-log` | Auto-emit `log::*` log lines for every observation. |
| `trace-tracing` | Auto-emit `tracing::*` events with structured fields. |
`embassy` and `tokio` are mutually exclusive — enabling both is a compile
error.
error. The `trace-*` and `journal` features are independently composable
with each other and with the runtime feature; with no sink feature on,
the trace points compile to nothing (zero overhead).
## Migration from v0.1
## Observability — one journal, multiple outputs
v0.1 statecharts continue to compile. New features are purely additive:
On hsmc's side, turning on observability is a single Cargo feature.
On your side, it's whatever you'd already do to wire `defmt` / `log`
/ `tracing` to an output — hsmc does not initialize a logger
(libraries shouldn't; `main` owns that decision).
### 1. `events:` is now optional
If your firmware crate already uses `defmt`, add the feature and
you're done — chart events interleave with the rest of your defmt
output:
Previously required; now omit for pure timer-only machines:
```toml
hsmc = { version = "0.6", features = ["embassy", "trace-defmt"] }
```
For a desktop crate, pick `log` or `tracing` and do that framework's
normal one-line init in `main`:
```toml
[dependencies]
hsmc = { version = "0.5", features = ["tokio", "trace-tracing"] }
tracing-subscriber = "0.3"
```
```rust
statechart! {
Blinker {
context: Ctx;
default(On);
state On { on(after Duration::from_millis(500)) => Off; }
state Off { on(after Duration::from_millis(500)) => On; }
}
#[tokio::main(flavor = "current_thread")]
async fn main() {
tracing_subscriber::fmt::init();
let mut m = Blinker::new(Ctx { on: false, blinks: 0 });
let _ = m.run().await;
}
```
### 2. `dispatch(ev).await` replaces the push+drain helper
Swap `trace-tracing` for `trace-log` and `tracing_subscriber::fmt::init()`
for `env_logger::init()` if you prefer the `log` ecosystem; the rest is
identical. With no sink feature enabled at all, the observation calls
compile to `()` — the runtime is byte-identical to a chart with no
instrumentation.
Before (v0.1, in the dogfood firmware):
| Feature | Sink |
| --------------- | -------------------------------------------------------- |
| `journal` | In-memory `Vec<TraceEvent>` (replay, byte-deterministic) |
| `trace-defmt` | `defmt::*` log lines |
| `trace-log` | `log::*` log lines |
| `trace-tracing` | `tracing::*` events with structured fields |
```rust
async fn push<M>(m: &mut M, ev: E) {
m.send(ev).expect("queue full");
while m.has_pending_events() {
m.step(Duration::ZERO).await;
}
}
push(&mut machine, ev).await;
Multiple sinks can be enabled simultaneously; the journal IS the
observation stream and trace backends are textual renderings of it,
so they cannot diverge.
The textual format is logfmt-style — greppable and regex-parseable:
```
[statechart:Microwave] started chart_hash=0xa1b2c3d4
[statechart:Microwave] entering state=Idle
[statechart:Microwave] action state=Idle action=clear_display kind=entry
[statechart:Microwave] timer-armed state=Idle timer=t0 duration_ns=5000000000
[statechart:Microwave] during-started state=Idle during=poll_sensor
[statechart:Microwave] entered state=Idle
[statechart:Microwave] event-received name=StartButton
[statechart:Microwave] event-delivered name=StartButton handler=Idle
[statechart:Microwave] transition-begin from=Idle to=Heating reason=event:StartButton
[statechart:Microwave] exiting state=Idle
[statechart:Microwave] timer-cancelled state=Idle timer=t0
[statechart:Microwave] during-cancelled state=Idle during=poll_sensor
[statechart:Microwave] action state=Idle action=stop_motor kind=exit
[statechart:Microwave] exited state=Idle
[statechart:Microwave] entering state=Heating
[statechart:Microwave] entered state=Heating
[statechart:Microwave] transition-complete from=Idle to=Heating
```
After (v0.2):
### The verb vocabulary
```rust
machine.dispatch(ev).await.unwrap();
```
Twenty verbs cover every `TraceEvent` variant. Begin/end markers
bracket entry, exit, and transition phases so the actions, timers,
and durings running inside each phase are visible.
### 3. `during:` replaces the imperative I/O outer loop
| Verb | Fires when |
|---|---|
| `started` | First step of a chart's life — carries `chart_hash` |
| `entering` / `entered` | Begin / end of a state's entry phase |
| `exiting` / `exited` | Begin / end of a state's exit phase |
| `action` | An action fn was called — `kind=entry\|exit\|handler` |
| `during-started` / `during-cancelled` | A `during:` activity started / was dropped |
| `transition-begin` / `transition-complete` | Begin / end of a transition's exit-then-enter sequence |
| `event-received` | An event was popped from the queue |
| `event-delivered` | A handler ran for the event |
| `event-dropped` | The event reached root with no handler |
| `emit-queued` / `emit-failed` | `emit()` from inside an action — queued or rejected |
| `timer-armed` / `timer-cancelled` / `timer-fired` | Timer lifecycle |
| `terminate-requested` | `terminate(...)` event matched, exit chain about to run |
| `terminated` | Chart finished (always last) |
Before — a radio task with per-state match and select:
```rust
loop {
match machine.current_state() {
RadioState::Receiving => {
match select(rx_once(&mut lora, &cfg, &mut rx_buf),
commands.receive()).await {
Either::First(r) => handle_rx(r, &mut machine, ...).await,
Either::Second(c) => handle_cmd(c, &mut machine, ...).await,
}
}
_ => { ... }
}
}
```
After — the statechart owns the loop:
```rust
state Receiving {
during: next_packet(lora, rx_buf);
on(PacketRx { rssi: i16, snr: i16 }) => record_packet;
on(StopRx) => Idle;
}
#[embassy_executor::task]
async fn radio_task(lora: LoRaDriver, ch: &'static RadioChan) {
let mut m = Radio::new(RadioCtx { lora, ... }, ch);
m.run().await.unwrap();
}
```
The `reason=` field on `transition-begin` records what triggered the
transition: an event (`event:VariantName`), a timer
(`timer:State/timer-id`), or `internal`. Real-life captures can be
diffed against expected behavior the same way the journal can.
## Examples
| Example | Purpose |
|--------------------|---------------------------------------------------------------------|
| --------------- | --------------------------------------------------------------------- |
| `microwave` | Full-feature pure-event machine: entry/exit, timers, emit, terminate. |
| `microwave_tui` | TUI variant of microwave. |
| `during_radio` | `during:` activities simulating a radio task with RX + TX loops. |
| `embassy_full` | Embassy feature demonstration. |
Run `cargo run --example during_radio --features tokio` to see the
`during:` pattern end-to-end.
## Verification
`hsmc` ships with a Creusot deductive-verification crate
(`verification/`) that proves the runtime's `EventQueue` and
`TimerTable` correct against Pearlite specs. Why3 + alt-ergo + z3
discharge every VC mechanically. Run:
```bash
just verify
```
The recipe is self-installing (mise pulls in the pinned nightly,
opam, Why3, the SMT solvers, and `cargo-creusot`) so a fresh clone
gets to a green proof in one command. See
[`verification/INVARIANTS.md`](verification/INVARIANTS.md) for the
spec-rule → proof mapping.
Beyond Creusot, the suite includes:
- **Integration tests** — full chart behavior and per-feature
determinism, with byte-equal expected-vs-actual journals on the
`det_*` deterministic-flow tests, plus trace-format regression
tests pinning every observation verb's textual rendering. Run
with `cargo test --workspace --features tokio,journal`.
- **`cargo mutants`** — full coverage under `cargo mutants --features
tokio,journal,trace-log`.
- **Miri** — clean, no UB on the runtime crates.
## What `hsmc` deliberately does NOT have
The bet is on **simple, consistent semantics**. These features are
omitted on purpose; for each, what to do instead:
| Missing feature | Use instead |
| ------------------------------- | ----------------------------------------------------------------------------------------------------- |
| Guard conditions on transitions | Split source into two states, or have an action `emit()` a follow-up event for the chart to branch on |
| Orthogonal / parallel regions | Two charts as two tasks connected by channels, or multiple `during:` activities in one state |
| History states | Store last child explicitly in your context; transition to it on re-entry |
| Deferred events | Handle where they arrive (drop/log if not relevant), or have producer check state |
| Internal transitions | `action(Trig) => fn;` (no transition) — exactly that |
| State-local context | All state in the root context; durings borrow disjoint fields |
| Event priorities beyond FIFO | Higher-priority events on a separate channel into a separate, faster machine |
| Runtime statechart modification | Design every variation up front as states |
| Multi-threaded tokio | `flavor = "current_thread"` is the supported path — one task per chart |
See [`docs/002. hsmc-semantics-formal.md`](docs/002.%20hsmc-semantics-formal.md)
§ "What `hsmc` deliberately does NOT have" for the rationale on each.
## Status
- v0.1 spec: fully implemented.
- v0.2 additions: `during:`, optional `events:`, `dispatch()`, `STATE_CHART`,
drain-on-send.
- Out of scope: state-scoped context types (hierarchy), guard conditions,
orthogonal/parallel regions, history states, runtime statechart
modification, multi-threaded tokio.
Pre-1.0. Per-release breaking changes are documented in
[`CHANGELOG.md`](CHANGELOG.md).
## License
Dual-licensed MIT OR Apache-2.0.
MIT. Copyright (c) 2026 Stephen Waits &lt;steve@waits.net&gt;. See [LICENSE](LICENSE).
docs/000. original-hsmc-spec.md
+68 -14
View File
@@ -41,9 +41,9 @@ A state is a named node in the state hierarchy. States may be nested arbitrarily
### 2.3 State Configuration
At any point in time, the machine is in exactly one "state configuration," which is a path from the root state down through the hierarchy to a leaf (or to a state with no children). If state `A` contains state `B` which contains state `C`, and `C` is the active leaf, then the machine is simultaneously "in" states `A`, `B`, and `C`.
At any point in time, the machine is in exactly one "state configuration," which is a path from the root state down through the hierarchy to the **innermost active state**. The innermost active state may be a state with no declared children, or a composite state that has become the innermost active state via a transition to an already-active ancestor (§2.6) and therefore has no active child. If state `A` contains state `B` which contains state `C`, and `C` is the innermost active state, then the machine is simultaneously "in" states `A`, `B`, and `C`.
When entering a state that has children, the machine automatically descends into the `default` child, recursively, until it reaches a state with no children or no default.
When a state becomes newly active — that is, it was not in the previous configuration — and it has children, the machine automatically descends into the `default` child, recursively, until it reaches a state with no children or no default. A transition that targets a state which is already active (see §2.6) does NOT trigger default descent, because the target is not newly entered.
### 2.4 Events
@@ -60,12 +60,23 @@ A trigger is either:
A transition specifies: when trigger `T` occurs in state `S`, move to state `Target`.
Transitions are classified by the relationship between `Target` and the **innermost active state** `I` at the time the transition fires:
- **Up-transition**: `Target` is already active — that is, `Target` lies on the path from the root down to `I`, and `Target ≠ I`. You cannot enter a state you never left. An up-transition therefore only unwinds the subtree strictly below `Target`.
- **Self-transition**: `Target = I`. The innermost active state is exited and re-entered (timers restart; entry/exit actions fire).
- **Lateral transition**: `Target` is not on the active path. Standard LCA semantics apply.
The transition algorithm:
1. Find the least common ancestor (LCA) of the source state and the target state.
2. Exit states from the current active leaf up to (but not including) the LCA, calling exit actions in inner-to-outer order.
3. Enter states from the LCA down to the target state, calling entry actions in outer-to-inner order.
4. If the target state has children, descend into defaults recursively, calling entry actions along the way.
1. Classify the transition as up, self, or lateral (see above).
2. Compute the effective LCA:
- **Up**: effective LCA = `Target`.
- **Self**: effective LCA = parent of `Target` (so `Target` is exited and re-entered).
- **Lateral**: effective LCA = LCA(`I`, `Target`).
3. Exit states from `I` upward, calling exit actions inner-to-outer, stopping **before** the effective LCA. (The effective LCA is never exited.)
4. Entry behavior:
- **Up**: no entry actions fire. `Target` was already active and remains so; it is now the innermost active state, with no active child.
- **Self** and **Lateral**: enter states from the effective LCA down to `Target` (outer-to-inner), then if `Target` has children, descend into defaults recursively, calling entry actions along the way.
Transitions may target any state in the entire machine, not just siblings.
@@ -79,7 +90,7 @@ If both actions and a transition are registered on the same trigger in the same
### 2.8 Event Dispatch
When an event is received (or a timer fires), the machine searches for a matching transition or action starting from the current active leaf state and walking up toward the root. The first state that has a handler for the trigger processes it. If no state handles the trigger, the event is silently discarded.
When an event is received (or a timer fires), the machine searches for a matching transition or action starting from the innermost active state and walking up toward the root. The first state that has a handler for the trigger processes it. If no state handles the trigger, the event is silently discarded.
Timer triggers do NOT bubble. A timer belongs to the state that declared it and only fires in that state's scope. Event triggers DO bubble up the hierarchy.
@@ -91,13 +102,15 @@ Timer triggers do NOT bubble. A timer belongs to the state that declared it and
### 2.10 Default State
`default(ChildState)` specifies the initial child state. It is required in any state that has children. It is required at the root level. The referenced state must be a direct child of the containing state. This is enforced at compile time.
`default(ChildState)` specifies the child state to descend into when the containing state is newly entered (either at initial machine startup, or via a lateral/self-transition that enters it fresh). It is required in any state that has children. It is required at the root level. The referenced state must be a direct child of the containing state. This is enforced at compile time.
`default` does NOT fire when a state becomes the innermost active state via an up-transition (§2.6): the parent was already active, so there is no "new entry" to descend from.
### 2.11 Terminate
`terminate(EventVariant)` may only appear at the root level of the machine. It specifies that when the given event is received, the machine shuts down. Shutdown means:
1. Exit the current active leaf state, calling its exit actions.
1. Exit the innermost active state, calling its exit actions.
2. Exit each ancestor state up to and including the root state, calling exit actions in inner-to-outer order.
3. The machine is now terminated. `run()` returns. `is_terminated()` returns true.
@@ -246,7 +259,9 @@ impl<Name> {
/// Returns true if the machine has terminated.
fn is_terminated(&self) -> bool;
/// Returns the current active state configuration (leaf state).
/// Returns the innermost active state (see §2.3). This is typically a
/// leaf, but may be a composite state that became innermost via an
/// up-transition (§2.6).
fn current_state(&self) -> <Name>State;
/// Consumes the machine, returns the user's context.
@@ -633,15 +648,47 @@ Then: Exit order: [B_exit, A_exit]
current_state() == C
```
#### T2.8: Transition to an ancestor state
#### T2.8: Up-transition to an ancestor state
A transition whose target is already active (an ancestor of the innermost active state) only unwinds the subtree strictly below the target. The target itself is not exited and not re-entered. Its `default` is not followed — it was already active, so there is no "new entry."
```
Given: Machine with:
state A { default(B); state B { transition(Up) => A } }
Machine is in B.
When: Event Up is delivered
Then: Exit order: [B_exit, A_exit]
Entry order: [A_entry, B_entry] (re-enters A, descends to default B)
Then: Exit order: [B_exit]
Entry order: []
current_state() == A
```
#### T2.8b: Up-transition across multiple levels
```
Given: Machine with:
state A { default(B); state B { default(C); state C { transition(Up) => A } } }
Machine is in C.
When: Event Up is delivered
Then: Exit order: [C_exit, B_exit]
Entry order: []
current_state() == A
```
#### T2.8c: Handler on ancestor, target is a mid-ancestor
When the handler bubbles up to an ancestor, classification is based on the innermost active state at the time the transition fires — not on where the handler was found. If the target is on the active path and not the innermost, it is still an up-transition.
```
Given: Machine with:
state A {
default(B);
transition(Up) => B; // handler on A, target B
state B { default(C); state C {} }
}
Machine is in C.
When: Event Up is delivered
Then: Exit order: [C_exit]
Entry order: []
current_state() == B
```
@@ -1139,7 +1186,14 @@ The crate is considered complete when:
11. **Timer precision.** Timers fire on the first `step()` call where cumulative elapsed time meets or exceeds the duration. They do not fire early.
12. **No unsafe code** in the public API or generated code (implementation may use unsafe internally if justified and documented).
12. **Bounded `unsafe` in generated code, none in user code.** The
generated dispatch path uses six `slice::get_unchecked` blocks
for hot-path table indexing; their bounds are guaranteed at
codegen time, checked at build time by const-eval, in dev/test
by `debug_assert!`, and in CI under Miri. Inventory + audit in
[`docs/004. unsafe-safety-contract.md`](./004.%20unsafe-safety-contract.md).
User-facing code (chart definitions, action bodies, durings,
public API surface) contains no `unsafe`.
13. **Documentation.** Every public type, method, and trait has rustdoc with examples.
docs/002. hsmc-semantics-formal.md
+399
View File
@@ -0,0 +1,399 @@
# `hsmc` — How Your Chart Behaves
**Status:** DRAFT. This is the canonical answer to "what will my statechart
actually do?" When this document and another disagree, this one wins.
**Audience:** anyone writing a chart. The goal is that after reading this,
you can predict every action call, transition, and timer fire just by
looking at your `statechart!` block.
---
## Why `hsmc` is small (read this first)
`hsmc` ships the minimum set of useful statechart primitives. No guard
conditions, no orthogonal/parallel regions, no history states, no deferred
events, no internal transitions, no state-local context.
The bet is on **simple, consistent semantics**. The small surface area
makes hsmc easy to use, easy to reason about, and easy to predict. Once
you internalize a small set of rules, every edge case below just follows
from them — you don't have to memorize anything new.
---
## What a chart contains
Each primitive, in roughly the order a developer first meets them.
- **State** — a named node. The root state (the machine itself) is just a
state. Every state is just a state.
- **Nested state** — a state inside another state. Same thing as a state.
- **Entry action** — a function called once when a state is entered.
- **Exit action** — a function called once when a state is exited.
- **Transition** — exits one state and enters another, anywhere else in the
chart. Walks from the current state up to the lowest common ancestor
(LCA) of source and target, calling exits along the way, then walks down
to the target, calling entries along the way.
- **Action (without transition)** — a function call attached to a trigger.
No state change. That's it.
- **Default transition** — any state **may** declare one `default(...)`.
It's a transition (same LCA-aware algorithm as rule 4 / event-driven
transitions) that fires immediately after the declaring state's entry
actions finish and its durings start. The target may be any state in
the chart — a child (the classic descent case), a sibling, an
ancestor, anywhere. Defaults chain (each link is itself a transition)
until they reach a state with no default. The compiler rejects cycles
in the default graph at compile time, so every chain terminates. When
a state has no `default`, nothing else happens after entry — the
state itself is the resting innermost active state.
- **Trigger: event vs. duration** — an event is a variant of your event
enum. A duration is a timer (`after Duration` fires once, `every
Duration` fires repeatedly). Triggers attach to transitions and to
actions. Timers and events are dispatched slightly differently — see
the bubbling rules below.
- **`emit()`** — pushes an event onto the machine's queue from inside an
action. The event is dispatched after the current event has fully
finished processing. No re-entrant dispatch.
- **`during:` activity** — a cancellable async function. Started **after**
the entry actions of its owning state finish; cancelled **before** the
exit actions of that state begin to run when the state is left.
- **`terminate`** — names an event that, when received, exits the entire
active path bottom-up and shuts the machine down. Only valid at root.
---
## Where the machine "is"
At any moment, the machine is in a path of states from root down to one
innermost state. If you're in `C` inside `B` inside `A` (which is inside
the root), then you are simultaneously in **all** of `Root`, `A`, `B`, and
`C`. The root is always active until the machine terminates.
This is the most important rule in this document. Every other rule below
is downstream of it. **You are simultaneously in every state on the path
from the root to the innermost active state.** If a rule somewhere else
seems weird, come back to this one — it's probably the resolution.
`current_state()` returns the innermost active state, which is usually a
leaf, but can be a composite (a state with children) if you got there via
an up-transition (see below) and haven't moved since, or if you
transitioned into a composite that has no `default` declared.
---
## How events are handled
Event comes in. Start at the innermost active state. Does it have a
handler for this event? If yes, that handler runs and the event is
consumed — no further handling.
If no, walk up to the parent. Repeat. If you walk all the way to the root
and still nothing handles it, the event is silently discarded.
That's all. Three other things follow from this rule:
- A handler on the innermost active state shadows a handler on any
ancestor for the same event. The innermost wins because the search
starts there.
- If a single state has multiple handlers (actions and/or a transition)
for the same trigger, the actions fire in declaration order, then the
transition fires last.
- Timer triggers do **not** bubble. A timer belongs to the state that
declared it; it fires only in that state's scope. Events bubble; timers
don't.
---
## How transitions work
The current state (for transition purposes) is the innermost active state.
The target can be **any** state in the entire chart — there's a global
namespace, so state names must be unique across the chart.
The root state is targetable too: it's named after the chart itself. So
in `statechart! { Foo { ... } }`, an `on(Trig) => Foo;` is a valid
transition whose target is the root. From any state inside the chart this
is an up-transition (root is always on the active path) — exiting only
the states strictly between current and root, with no entry actions and
no default firing on root (the root wasn't freshly entered). Use this
when you want to wind everything back up to the chart's own scope.
To run a transition:
1. Find the LCA of current and target. (They might share a parent; they
might both be on the same root-to-leaf path; the LCA is always defined
because the root is always an upper bound.)
2. Walk **up** from the current state, exiting each state on the way
(cancel durings → run exit actions) until you hit the LCA. The LCA
itself is **not** exited.
3. Walk **down** from the LCA to the target, entering each state on the
way (run entry actions → start durings). The LCA is **not** re-entered.
4. If the target declares a `default(...)`, fire it as a recursive
transition (using the same algorithm). Defaults chain until a state
with no default is reached. Compile-time cycle check guarantees
termination.
The three flavors below are just three relationships between current and
target. The same algorithm covers all of them — they only look different
in which steps fire.
### Transitioning to a sibling (or anywhere not on your active path)
The standard case. LCA is somewhere strictly above both current and
target. Exit up to LCA, enter down to target, then if the target
declares a `default(...)`, fire it as a chained transition. Already
covered above.
### Transitioning to yourself
Self-transition: target equals the innermost active state. The standard
transition algorithm above gives the clean answer: the LCA of the target
with itself is its parent, so we exit only the target and re-enter only
the target. **Nothing above the target is exited or re-entered.**
Concrete example. Active path is `Root → SomeState → SomeOtherState`. A
transition fires whose target is `SomeOtherState`.
- Exit `SomeOtherState` (cancel durings, run exits).
- Re-enter `SomeOtherState` (run entries, start durings).
- `SomeState` is **never** exited, **never** re-entered, **never**
touched. Its timers and durings keep running.
Timers declared on the target restart, because the target itself was
exited and re-entered.
If the target happens to be a composite (it has children, but no child is
active right now because you got there via an up-transition or because
the composite has no `default`), the same rule still applies on re-entry:
exit the composite, re-enter it, then descend through its default chain
if it declares one. A composite without `default` is exited, re-entered,
and that's it — no further descent. Self-transitions don't add a new
rule — they're just the case where source and target are the same state.
Personally I don't find self-transitions all that valuable, but people
talk about them all the time, so they're supported.
### Transitioning to one of your parents (the important one)
The case to internalize. When you transition to an ancestor of the
current state, you exit the current state and any states between, but you
do **not** re-enter the ancestor. You were already there.
- The ancestor's entry actions don't fire.
- The ancestor's `default` is not followed.
- The ancestor's timers don't restart.
- The ancestor's durings keep running.
You cannot enter a state you never left. Spelling it out: starting from
leaf `C` inside `B` inside `A`, a transition to `A` exits `C` then `B`,
and now `A` is the innermost active state with no active child.
---
## Timers
- A timer starts when its state is entered.
- A timer is cancelled when its state is exited.
- Descending into a child state is **not** an exit — the parent's timers
keep running.
- Timers don't bubble. Only the state that declared the timer handles its
expiry.
- Re-entering a state restarts its timers.
If two timers happen to expire on the same `step()` tick — rare under
real wall-clock timing, but possible at `step()` granularity since
`step()` decrements all timers at once — the runtime today fires the
*oldest* (longest-armed) timer first, because it sits earlier in the
active-timers array. **Don't depend on this.** It's a likely outcome of
the current implementation, not a contract. If two timers must fire in a
specific order, model them as one timer plus an explicit `emit()` chain.
---
## Entry and exit ordering
Putting it all together:
- **Entry** runs **outer-to-inner**: when entering a path of states, the
outermost state's entry actions fire first, then its child's, and so on
down to the innermost. Within a single state, entry actions fire in
declaration order. After entry actions of a state finish, that state's
durings start. Then, if the state declares a `default(...)`, the
default fires as a transition (which may exit the state we just
entered if the target lies elsewhere in the chart) and the chain
continues from there. A state without `default` is the end of the
path — control stops there.
- **Exit** runs **inner-to-outer**: when leaving a path of states, the
innermost state exits first, then its parent, and so on up. Within a
single state, exit actions fire in declaration order. Before exit
actions of a state begin, that state's durings are cancelled.
So a full transition reads top-to-bottom as: cancel durings on the way
out → run exits on the way out → run entries on the way in → start
durings on the way in.
Observers (the journal and any active trace backend) see this as
phase **begin** and **end** markers bracketing the work: an
`EnterBegan { state }` fires before any of that state's entry actions /
timer arms / during starts, and an `Entered { state }` fires after
all of them finish. The same for `ExitBegan` / `Exited`, and
`TransitionFired` / `TransitionComplete` bracket the whole exit-then-
enter sequence of a transition. This is purely a visibility change —
the operational rules above are unchanged — but it lets you tell from
a captured trace which atoms ran inside which phase.
---
## `emit()` — sending events from inside an action
An action can call `self.emit(Ev)`. The event goes on the machine's
internal queue. It is **not** processed immediately. The runtime finishes
handling whatever event it's currently handling — including every entry
and exit action of any transition — and only then dequeues `Ev` and
dispatches it normally. No re-entrant dispatch.
Once the current handler finishes, the runtime drains anything queued
during handling before sleeping or returning to the outer loop.
If the queue is full, `emit()` returns `Err(QueueFull)`. Subsequent
actions in the same chain still run; they may attempt further emits, but
those also fail. At end of tick, the runtime surfaces `Err(QueueFull)`
out of `step()` / `run()` so the top-level driver can react. A queue
overflow is a hard signal that something is wrong with sizing or with the
producer; it is never silently swallowed.
---
## `during:` activities — async work scoped to a state
A `during:` is an async function that runs while its owning state is on
the active path. It is started after the entry actions of that state
finish, and it is cancelled before the exit actions of that state begin.
A during's future may be **dropped at any `.await` point** — when an
external event arrives, when a timer fires, when another during on the
same active path completes, or when a transition leaves the during's
state. This is the Rust async concept of *cancellation*: the future is
not given a chance to "finish gracefully" — it's dropped, and dropping
runs whatever destructors `Drop` impls have, but no further `.await`s
will ever resume.
The practical rule: write durings as cancel-safe state machines. Every
`.await` must be a clean resume point where dropping the future leaves
the borrowed fields in a re-enterable state. Don't straddle awaits with
mutations that need to commit atomically. If you need to learn what
cancel-safety looks like in practice, the README has the worked examples,
and the tokio docs on cancellation are the standard reference.
Multiple `during:` declarations on the same active path race against each
other (and against incoming events and timers). Each during borrows
disjoint `&mut` slices of the context — Rust's split-borrow checker
rejects overlapping borrows at compile time, so concurrent durings can
never step on each other's state.
---
## Termination
When a `terminate` event is received, the machine exits the entire active
path bottom-up: innermost first, then each parent, up to and including
the root. After that, the machine is done — `is_terminated()` is true,
`run()` returns `Ok(())`, further `step()` calls are no-ops returning
`None`. Any pending events in the queue are dropped. Any in-flight
durings are dropped at their next `.await`.
Once you adopt the simple, consistent semantics above, this just falls
out — termination is "exit everything you're currently in, in the usual
exit order, then stop."
---
## `step()` vs `run()` vs `dispatch()`
Three ways to drive the machine. Same underlying behavior; the differences
are about who decides when to advance time.
- **`step(elapsed)`** — synchronous. You call it; it does at most one unit
of work (one timer expiry, or one queued event). For bare-metal /
testing.
- **`dispatch(ev).await`** — async helper. Pushes `ev` onto the queue, then
drains the queue (and any timers that come due) until quiescent. For
injecting events from the same task that owns the machine.
- **`run().await`** — async. Owns the task body. Races durings against the
external event channel and timers, and processes whatever wins, in a
loop, until termination.
For the same external event sequence and the same elapsed-time inputs,
the three produce the same observable trace.
---
## What you cannot do, and why
The "minimum useful primitives" bet, made concrete. For each missing
feature: why we don't have it, and what to do instead. _(First-pass
drafts. Edit freely.)_
- **Guard conditions on transitions** — _Why not:_ guards bury control
flow inside an action body, so the chart's structure stops telling you
the whole story. _What to do instead:_ split the source into two
states whose entry conditions differ, or have an action emit a
follow-up event (`Ok` vs. `Bad`) and let the chart branch on that.
- **Orthogonal / parallel regions** — _Why not:_ true parallelism
multiplies state-space and forces a join-semantics for shared events.
_What to do instead:_ run two charts as two tasks and connect them with
channels, or use multiple `during:` activities for concurrent async
work within a single state.
- **History states (shallow or deep)** — _Why not:_ history is hidden
mutable state — re-entering a parent goes "somewhere" based on
invisible bookkeeping. _What to do instead:_ store the last child
explicitly in your context, then transition directly to it on
re-entry.
- **Deferred events** — _Why not:_ deferring means an event you sent now
can resurface much later, with non-obvious ordering. _What to do
instead:_ handle the event where it arrives (even if just to log and
drop it), or have the producer check state before sending.
- **Internal transitions** — _Why not:_ "transition that doesn't exit or
enter" is a separate semantics layer just to skip exit/entry. _What to
do instead:_ declare an `action(Trig) => fn` (no transition). That's
exactly what an internal transition is.
- **State-local context** — _Why not:_ hierarchical context types make
borrowing painful and tie the chart's structure into your data model.
_What to do instead:_ put all your state in the root context;
`during:` activities can borrow disjoint fields of it.
- **Event priorities beyond FIFO** — _Why not:_ priorities allow
starvation and make ordering implementation-dependent. FIFO is
predictable. _What to do instead:_ if some events are higher-priority,
deliver them on a separate channel into a separate, faster-cadence
machine.
- **Runtime statechart modification** — _Why not:_ the chart is the
static structural definition. Mutating it at runtime defeats
compile-time validation and makes the trace meaningless. _What to do
instead:_ design every variation up front as states or sub-states.
- **Inter-machine communication primitives** — _Why not:_ a built-in
messaging layer would have to pick winners between embassy / tokio /
bare-metal channels. _What to do instead:_ use whatever channel
primitive your runtime gives you (embassy `Channel`, tokio `mpsc`),
and feed events into `dispatch()` or `Sender::send()`.
---
## Quick reference
| Scenario | What fires |
| ------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Initial machine start | Root entries → if root declares a `default(...)`, fire it as a transition; chain continues until a state with no default. Durings start at each entered state. |
| Transition to sibling | Exit current up to LCA (cancel durings, run exits) → enter from LCA down to target (run entries, start durings) → if target declares a `default`, fire it; chain continues. |
| Transition to self | Exit innermost (cancel durings, run exits), re-enter innermost (run entries, start durings). Timers restart. If the re-entered state declares a `default`, fire it. |
| Transition to ancestor | Exit current up to (but not including) the ancestor. No entry actions. The ancestor's `default` is **not** fired (it wasn't freshly entered). Durings and timers continue. |
| Transition into a state with `default(<descendant>)` | After the target's entries fire, the default fires as a child-direction transition (no exits at this step). The chain continues from the new innermost. |
| Transition into a state with `default(<sibling/ancestor>)` | After the target's entries fire, the default fires as a transition that exits the just-entered target and lands elsewhere. The chain continues. |
| State has no `default(...)` | After its entries fire, control stops there. The state itself is the innermost active state until something explicitly transitions away. |
| Timer fires | The declaring state's handler runs (timers don't bubble). |
| Event with no handler | Silently discarded. |
| Event handled at innermost | Innermost state's handler runs (actions in declaration order, then transition if any). |
| Event handled at ancestor | Search bubbles up; first ancestor with a handler runs it. Innermost is still innermost; transition (if any) starts from innermost. |
| Action calls `emit()` | Event queued. Dispatched after the current event's handling fully completes. |
| Queue is full when `emit()` is called | `emit()` returns `Err(QueueFull)`. Remaining actions in the same chain still run; further emits in this tick also fail. `step()` / `run()` surfaces `QueueFull` at end of tick. |
| `terminate` event delivered | Exit innermost → … → exit root. Pending events dropped. Durings dropped. `run()` returns `Ok(())`. |
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# 003. Latency analysis: hsmc hot-path cost surface
This is an audit of where wall-clock and code-size cost lives in `hsmc`'s
event-dispatch path. It is intended to inform mitigation work for embedded
and embassy-rs use cases where every microsecond of dispatch overhead
couples directly into hardware-control loop tightness and jitter.
The audit is **analytical**, with three categories of evidence:
1. **Source reading** of `hsmc/src/lib.rs`, `hsmc/src/journal.rs`, and
`hsmc-macros/src/codegen.rs`.
2. **`cargo expand --release`** of two test programs (one with no
observation features, one with `tokio + journal`) to confirm what the
macro really emits.
3. **`cargo rustc --release --emit=asm`** spot-checks of the compiled
output to confirm LLVM-level claims (jump-table lowering, dead-code
elimination of unused name tables, async-closure code size).
The audit deliberately stops short of recommending mitigations. A ranked
menu of candidates is included at the end so a follow-up planning round
can pick from it; nothing here is a commitment.
---
## 1. Cost surface, ranked by per-event impact
| # | Source | Class | Per-event cost (estimate) | Location |
|----|-----------------------------------------------|-----------------------------|------------------------------------------------------------------------------------------------------------|---------------------------------------|
| # | Source | Class | Per-event cost (estimate) | Status |
|----|-----------------------------------------------|-----------------------------|------------------------------------------------------------------------------------------------------------|---------------------------------------|
| 1 | `dispatch().await` loop | Discretionary, async-only | 2 awaits cold-start / 1 await steady-state per dispatched event. ~free if action body never `Pending`-yields. | open |
| 2 | LCA + transition path build | Discretionary | ~~O(H²) `heapless::Vec<u16,32>::contains` scan~~ → ~~O(H) depth-walk~~ → **O(1) `__PATH_RANGE` lookup**. Up/self/lateral folded into the precomputed table; `lca()`, `is_up_transition()`, and the per-call `heapless::Vec<u16,16>` ancestry build are all gone. | resolved |
| 3 | Parent walk for handler search | Discretionary | ~~O(H) `__PARENT` walk + per-hop `__handler_lookup` call~~ → **O(1) `__DISPATCH[(state, event)]` lookup**. Every (state, event) pair statically resolved at codegen. `__handler_lookup` retained for timer dispatch only. | resolved |
| 4 | `__handler_lookup` nested match (timer path) | Intrinsic | Still used for timer dispatch. LLVM lowers to jump tables (verified `LJTI*`). ~1 indirect jump per call. | open (already at floor) |
| 5 | `run_action` dispatch | Intrinsic | One match arm + monomorphized trait call + 1 vtable hop on `&mut dyn QueuePush` (verified devirtualized when callsite type is known). | open (already at floor) |
| 6 | Event queue push/pop | Intrinsic | `heapless::Deque::push_back` / `pop_front`, both O(1). | open (already at floor) |
| 7 | `__chart_observe!` macro arms | Compile-eliminable when off | Zero residue when all sink features off. Each call site collapses to `{};`. | verified zero-cost |
| 8 | Journal `Vec::push` per atom | Conditional on `journal` | Amortized O(1); ~16 B per `TraceEvent`. ~11 push sites fire per transition. | opt-in |
| 9 | Async-fn future size (binary cost) | Discretionary, async-only | ~3000 asm lines of chart machinery for a 5-state chart; dominated by async-fn state machines. | open (mitigation H3) |
| 10 | `tokio::sync::mpsc::unbounded_channel` | Tokio-only, std-bound | Heap-backed channel for cross-task event injection. Embassy uses bounded `embassy_sync::channel`. | feature-specific |
| 11 | TimerTable per-step / per-exit fixed cost | Discretionary | ~~Unconditional `pop_expired` + `cancel_state` calls every step / exit~~ → **inlined `is_empty()` + `#[cold]` non-empty body** (runtime branch on charts that use timers; compile-time elided on timer-free charts). | resolved |
| 12 | TimerEntry size + per-decrement work | Discretionary | ~~`remaining_ns: u128`, 32-byte entry, u128 saturating-sub per decrement~~ → **`u64`, 16-byte entry, u64 saturating-sub** (~584-year ceiling; Duration::from_nanos round-trips exactly). | resolved |
| 13 | `do_terminate()` exit walk | Discretionary | ~~Runtime `__PARENT` walk + `pop_front`-loop queue drain~~ → **precomputed `__TERMINATE_DATA` slice + `Deque::clear()`** (O(1)). | resolved |
Items 2, 3, 11, 12, 13 are fully resolved by the precompute / inline-
empty-check passes in this round of work — see `hsmc/benches/baseline.txt`
for the per-pass delta blocks. Items 4–6 are at or near the algorithmic
floor for hierarchical state machines. Item 7 is verified zero-cost.
Items 1 (async overhead) and 9 (async machinery binary size) are the
only meaningful open items; both are addressable via a `dispatch_sync()`
fast path (mitigation H3 in §9), which would be a user-facing API
change and is therefore out-of-scope for this round.
---
## 2. Per-event cost model (analytical)
For a chart with hierarchy depth `H=3`, one entry action + one exit action,
a simple lateral transition, no observation features, `cargo build
--release`, on a Cortex-M4-class core (~168 MHz):
| Stage | Cycles (rough) | Notes |
|----------------------------------------|--------------------|------------------------------------------------|
| `queue.pop_front` | ~5–10 | `heapless::Deque` index op |
| `__event_to_id` | ~3–5 | match arm (jump table) |
| `__DISPATCH[(state, event)]` lookup | ~5 | one indexed load + sentinel branch |
| `run_action` (1 action) | ~10–20 | match + monomorphized call + 1 vtable hop |
| Path lookup (`__PATH_RANGE`) | ~5 | one indexed load + slice arithmetic |
| Exit chain (H states × A actions) | ~3 × H + 30 × A | per-state work is now ~3 instr each |
| Enter chain (H states × A actions) | ~3 × H + 30 × A | per-state work is now ~3 instr each |
| Timer machinery (timer-free chart) | 0 | codegen-elided when `ir.duration_triggers.is_empty()` |
| Timer machinery (timer chart, no fire) | ~3 | inlined `is_empty()` branches × 3 |
| Timer machinery (timer firing) | ~30–40 | decrement + pop_expired + dispatch_trigger |
| **Total `.step()` steady-state** | ~0.4 – 0.8 µs | for H=3, A=1; user action body excluded |
| Async overhead (`.dispatch()` loop) | per-await checkpoint | ~free if no `Pending`-yield |
These are back-of-envelope numbers; actual measurements would tighten
them by ~2× in either direction, depending on inlining decisions.
For empirical numbers (deterministic, instruction-counted), see
`hsmc/benches/baseline.txt`. Headline numbers (current):
h2_warm_lateral 84 instr / 397 cycles; h4_cross_tree 101 instr / 456
cycles; h8_cross_tree 93 instr / 443 cycles; bubble_top 99 instr /
453 cycles (4-hop handler resolution); bubble_cross_tree 94 instr /
444 cycles (4-hop bubble + 10-state cross-tree); terminate_event 69
instr / 311 cycles; timer_fire_dispatch 191 instr / 706 cycles;
chain_self_emit 419 instr across 4 events (≈105 instr/event).
Cumulative on h8_cross_tree: **-82% instructions / -72% cycles** vs
the original O(H²) LCA scan.
---
## 3. Spot-check evidence
### 3.1 `__chart_observe!` is zero-cost when off (cargo expand)
Test: `tests/state_chart_const.rs`, with no observation features enabled.
In the expanded source (`/tmp/hsmc_expand_no_features.rs`, 911 lines), every
observation site collapses to an empty block:
```rust
// in `step()`:
if self.current.is_none() {
{}; // would be observe_started
self.enter_path(0);
return self.timers.min_remaining();
}
// ...
if let Some((state, trig)) = self.timers.pop_expired(&__DEPTH) {
let __t_state = state;
let __t_trigger = trig;
{}; // would be observe_timer_fired
// ...
}
```
A grep for any of `TraceEvent::`, `::log::`, `::tracing::`, `::defmt::`,
`JournalSink::push` in the expanded code returns **zero matches**. The
macro arms entirely vanish.
`JournalSink` itself becomes a unit struct when the feature is off:
```rust
#[cfg(not(feature = "journal"))]
pub struct JournalSink; // ZST — 0 bytes in the chart struct
```
so the `__journal` field on the chart costs zero bytes at runtime.
### 3.2 Name lookups are dead-code-eliminated (cargo rustc --emit=asm)
Test: `tests/det_lateral.rs`, built with `--features tokio,journal`.
Even with `journal` enabled, a grep across the 22,477 lines of generated
asm for `state_name`, `action_name`, `event_name`, or `timer_name` returns
**zero matches**. The journal stores `u16` indices, not strings, and no
trace-* feature is on, so the name-lookup helper functions are uncalled
and DCE'd from the final binary.
This means even if a user enables `journal` for replay/verification, they
pay zero binary cost for the human-readable name tables until they also
enable a `trace-*` sink.
### 3.3 LLVM lowers handler matches to jump tables
Same asm file. Grep for `LJTI`:
```asm
leaq .LJTI2_0(%rip), %rcx
jmpq *%rax
.LJTI2_0:
.long .LBB2_1-.LJTI2_0
.long .LBB2_28-.LJTI2_0
.long .LBB2_29-.LJTI2_0
.long .LBB2_23-.LJTI2_0
```
Multiple jump tables are present, each sized roughly to the chart's
state/event count. This corroborates the assumption that
`__handler_lookup`'s nested `match (state_id) { match (kind, trigger_id) }`
lowers to a single indirect jump on platforms LLVM can target with one,
not a chain of compares.
### 3.4 Async machinery code size
Symbol-by-symbol asm sizes from `det_lateral`:
| Symbol (async closure / future) | Asm lines | Notes |
|---------------------------------|-----------|----------------------------------------------|
| `Lat::exit_state` | ~275 | one `.await` per exit action |
| `Lat::run_action` | ~349 | match arm + N monomorphized async branches |
| `Lat::run_handlers` | ~826 | loop over actions, each `.await` |
| `Lat::enter_state_no_descent` | ~217 | |
| `Lat::step` | ~970 | inlines `lca`, `is_up_transition`, etc. |
| `Lat::dispatch` | ~137 | thin loop wrapper |
| **Lat-chart total** | **~2,800**| async machinery for one 5-state chart |
For comparison, `Lat::new` is 141 lines. The async coloring
roughly doubles to triples the binary footprint of a chart relative to a
pure sync codegen. On Cortex-M0/M0+ where flash is small, this matters.
### 3.5 Journal expansion adds N pushes, nothing else (cargo expand)
Same test, expanded with `--features tokio,journal`
(`/tmp/hsmc_expand_with_journal.rs`, 2,426 lines vs. 911 lines without).
Counts:
- 104 total `TraceEvent::*` constructions.
- 20 distinct variant names (the full vocabulary).
- 8 `Vec::push` call sites inside `step()` — but only one fires per
invocation (timer-fired path, event-received path, etc., are mutually
exclusive).
The diff against the no-feature expansion is exactly: every `{};`
placeholder becomes a `(&mut self.__journal).push(TraceEvent::...)`. No
other infrastructure is added. No locking, no allocation per push beyond
the amortized `Vec` growth.
---
## 4. Observability cost matrix
Distilled from `lib.rs:158-712` and the spot-checks above:
| Feature(s) | Per-call CPU | Per-call alloc | Off → fully elided? |
|-------------------|-------------------------------------------|--------------------------|-------------------------------|
| `(none)` | 0 | 0 | Yes (verified) |
| `journal` | `Vec::push` ~10 ns amortized | ~16-24 B amortized | n/a |
| `trace-defmt` | format-hash u32 + field write | 0 | Yes |
| `trace-log` | `log_enabled!()` check + format if passes | 0 unless format | Yes (with small residual when on but level filtered) |
| `trace-tracing` | unconditional field collection + span | 0 | Yes (with ~30-cycle residual when on but no subscriber) |
The codegen emits **~11 `__chart_observe!` calls per typical transition**
in deterministic order: `EventReceived` → `EventDelivered` →
`TransitionFired` → `ExitBegan` → `ActionInvoked{Exit}` → `Exited` →
`EnterBegan` → `ActionInvoked{Entry}` → `Entered` → `TransitionComplete`,
plus action-handler markers. That's the multiplier on every per-call
number above.
---
## 5. What is *not* a problem (audited and dismissed)
- **Handler-lookup growth with chart size** — confirmed jump-table
lowering (§3.3). O(1) per event regardless of state or event count
(modulo cache effects from larger jump tables).
- **Trait-object cost on action dispatch** — only the `&mut dyn QueuePush`
proxy is `dyn`. User actions are monomorphized trait methods (one match
arm per action ID, direct calls). One vtable hop per emit, *not* per
action.
- **Observation overhead with features off** — confirmed zero. Verified
three ways: macro arm structure (every body `#[cfg]`-gated), expanded
source (every site is `{};`), and asm (no name-lookup symbols, no trace
symbols).
- **Heap allocation in default build** — `extern crate alloc` is confined
to `journal.rs:26`. With `journal` off, the runtime is fully stack-only.
Verified: no `Vec`, `Box`, or `String` in expanded sync code.
- **`Pin<Box<...>>` futures on the hot path** — none. Chart futures are
inline state machines, not boxed.
- **Tokio `unbounded_channel` for embedded** — irrelevant: tokio is `std`
anyway. Embassy uses bounded `embassy_sync::channel::Channel` (no
alloc).
---
## 6. Event entry points
Events reach the chart's internal `heapless::Deque` via four distinct
paths. Each has its own latency, wakeup, ordering, and backpressure
profile, summarized below.
| Path | API | Backing | Wakeup | Ordering | Backpressure |
|------|-------------------------------------------|--------------------------------------------|-------------------------|----------------------------------------|------------------------------------|
| 1 | `chart.send(event)` (sync, single-task) | `heapless::Deque::push_back` | none — caller drives | FIFO within queue | `Err(QueueFull)` immediate |
| 2a | `chart.sender().send(ev)` (tokio) | `tokio::sync::mpsc::unbounded_channel` | tokio task wake | FIFO; biased select deprioritizes vs. durings | **unbounded memory** |
| 2b | `chart.sender().send(ev)` (embassy) | `embassy_sync::channel::Channel` (bounded) | embassy task wake | FIFO; same biased-select | `Err(Full)` (try_send) or backpressure-await |
| 3 | `actx.emit(ev)` from inside an action | same internal `Deque` as path 1 | none — drained inline | drained synchronously after current handler completes; *before* `step()` returns | sticky overflow flag |
| 4 | return from a `during:` future | `select!` arm in run loop | driver-specific | biased priority over channel events | silent drop on `Deque` full |
**Path 1 (sync send)** — `codegen.rs:2316-2319`. Bare
`Deque::push_back`; owning task only, no synchronization. ~5–10 cycles.
Caller is responsible for invoking `step()` (or `dispatch()` under an
async feature) to actually process the event.
**Path 2 (cross-task `sender()`)** — `codegen.rs:1492` (tokio sender),
`1638` (embassy sender), `1308` / `1405` (run-loop receive sites). The
canonical cross-thread / ISR path per the spec. Tokio uses an unbounded
MPSC (heap-backed; no backpressure signal); embassy uses a bounded
`Channel<M, E, N>` with `try_send` for ISR-safe non-blocking emits and
an `async send` that backpressures the producer. The receiver task
wakes on send; one iteration of the run-loop's `select!` consumes the
event and pushes it into the internal `Deque`.
**Path 3 (self-emit from action)** — `actx.emit(...)` goes through
`EmitProxy::push` (`hsmc/src/lib.rs`) which writes into the same
internal `Deque` as Path 1. Self-emitted events are drained in the
*same* `step()` call that emitted them — `dispatch()` runs `while
!queue.is_empty() { step().await }` until quiescence. Nothing crosses a
task boundary.
**Path 4 (`during:` return)** — `codegen.rs:1306–1313` (tokio with
durings), `1392+` (embassy). Durings are racing futures spawned in the
run-loop's `select!`. When one resolves to an event, the `select!`
unblocks and the event is pushed into the internal `Deque`. The
`select!` is `biased;` so durings have priority over the channel —
relevant if a during is a poll-based driver that's almost always
ready (see §8).
**One ordering caveat**: there is no global FIFO across paths 1–4.
Within each path, events are FIFO; across paths, the order depends on
when each path's wakeup arrives at the run loop. For most charts this
is a non-issue, but a chart that mixes high-frequency cross-task sends
with rapid self-emits could observe self-emits processed before
external events that arrived "first" in wall-clock terms.
---
## 7. Cooperative-driving audit
The library targets embassy-rs's single-priority cooperative scheduler,
where any tight loop without an `.await` can starve other tasks. An
audit of every loop and await pattern in the runtime and codegen:
| Loop / await | Location | Bounded? | Awaits per iter? | Verdict |
|---------------------------------------|---------------------------|-------------------------|--------------------------|---------------------|
| Main `run()` outer | codegen.rs:1290+, 1379+ | by `terminated` flag | yes — always | cooperative |
| `dispatch()` drain loop | codegen.rs:2339 | by queue size | only via `step().await` | suspect — fairness |
| Transition exit/enter slice loops | codegen.rs (transition) | by precomputed slice len| yes (async variant) | OK |
| Termination drain | codegen.rs:2750 | by hierarchy + queue | yes (async variant) | OK |
| Timer decrement / pop | runtime / lib.rs | by timer-table size | sync, off the event-loop | OK |
| Send/recv backends | codegen.rs:1308, 1405 | n/a | always `.await` | cooperative |
No `try_recv` patterns anywhere. No fixed-period polling. The library
is fundamentally event-driven and embassy-friendly.
**One latent fairness characteristic**: the `dispatch()` drain loop —
`while !self.queue.is_empty() { step(Duration::ZERO).await }` — never
yields to the executor between iterations. If user actions are all
synchronous and they emit a chain of follow-on events (action A emits
B, B emits C, …), each `step().await` completes inline, and the loop
becomes effectively synchronous for the duration of the chain. Embassy
high-priority tasks could be delayed by the chain length.
This is **not a bug** — `dispatch()` is documented to drain to
quiescence — but it's worth knowing about. A future option (not part of
this round of work) would be a feature-gated
`embassy_futures::yield_now().await` every Nth iteration, or a
chart-level config to bound chain length. Not done by default because
it would serialize the common case for no benefit.
---
## 8. Correctness invariants surfaced during the audit
Three contracts that aren't bugs, but warrant explicit documentation
because they are easy to miss when reading the code:
**Sticky overflow flag in `EmitProxy`** (`hsmc/src/lib.rs`,
`EmitProxy::push`). When a self-emit fails because the internal `Deque`
is full, an `__overflow` flag is set on the chart. *Every* subsequent
`actx.emit(...)` in the same dispatch chain returns `Err(QueueFull)`,
even after the queue has drained. The flag is cleared at the top of
each `dispatch()` call by `take_overflow()`. This is intentional — it
prevents a chart from observing a partially-applied sequence of
self-emissions where some made it into the queue and others did not.
Authors of actions that emit multiple events should treat
`Err(QueueFull)` as terminal for the current chain.
**Biased select in run loop** (tokio: `codegen.rs:1306–1313`; embassy:
`1392+`). The `select!` is `biased;`, so durings are always polled
before the cross-task channel. For most charts this is the right
priority — a sensor driver should pre-empt a UI event. But for a
`during:` that wraps a poll-based driver (one that returns `Ready`
nearly every poll), the channel can be starved indefinitely. Cure:
make the during yield (`embassy_futures::yield_now`) when there's
nothing real to report.
**Cancel-safety contract on durings** (`hsmc/src/lib.rs:53–60`). Every
`.await` in a `during:` future must be a clean resume point, because
the future will be dropped if the state transitions before it
completes. This is the standard async-cancel-safety contract, but it
is easy to violate by holding a mutable borrow across an await — the
borrow is "valid" when resumed but the surrounding state may have
moved on.
---
## 9. Candidate mitigations (menu, NOT a commitment)
Sized for sequencing in a follow-up plan-mode session. "Effort" is gut
feel: L = afternoon, M = couple of days, H = a week or more.
| ID | Mitigation | Targets | Impact | Effort | Cost |
|-----|-----------------------------------------------------------------------------------------------------------------------------------|-----------|-----------------------------------------|--------|---------------------------------------|
| H0 | Replace `lca()` with an O(H) depth-walk via the `__DEPTH` table. | #2 | **Landed.** | - | - |
| H1 | Codegen per-(from, to) precomputed exit/enter chains as `__PATH_DATA` + `__PATH_RANGE`. | #2 | **Landed.** Up/self/lateral folded into one indexed lookup; `lca()` and `is_up_transition()` removed. | - | ~`6·N²` B index + ~`N²·H` B path data |
| T1 | Inlined `is_empty()` early-out on `pop_expired` / `min_remaining` / `decrement` / `cancel_state` with `#[cold]` non-empty bodies. | #11 | **Landed.** | - | - |
| T2 | Codegen-static elide of all `TimerTable` calls when `ir.duration_triggers.is_empty()`. | #11 | **Landed.** Most charts are timer-free; `step()` returns `None` directly. | - | - |
| H4 | `__DISPATCH[(state, event)]` const array; one indexed lookup replaces the runtime __PARENT bubble walk + per-hop `__handler_lookup`. | #3 | **Landed.** Each (state, event) statically resolved at codegen. | - | ~24 B per (state, event) pair |
| U1 | Shrink `TimerEntry.remaining_ns: u128 → u64` (~584-year ceiling). Halves entry size; replaces u128 saturating-sub with u64. | #12 | **Landed.** | - | - |
| K1 | `__TERMINATE_DATA` per-state precomputed exit chain (root inclusive); `do_terminate()` indexes a slice instead of walking __PARENT, and uses `Deque::clear()` (O(1)) for the queue drain. | #13 | **Landed.** terminate_event -22.5% instr / -23.4% cycles. | - | ~`(H+1)·N` B path data |
| H3 | Provide a `dispatch_sync()` API that bypasses `.await` when the chart's actions are fully synchronous. | #1, #9 | High for sync-action charts | L-M | API surface growth (user-facing) |
| H5 | Sparse `__PATH_RANGE` / `__DISPATCH` for very large charts (N > 64): emit only reachable pairs with a small perfect-hash. Latency-neutral; cuts O(N²) static memory growth. | cost mitigation | Low at typical N; significant at N > 100 | M | codegen complexity |
| M1 | Eliminate the trailing `step().await` in `dispatch()` when queue empties mid-step. | #1 | Low | L | minor refactor |
| M2 | Lazy field eval in `trace-tracing` arm using `tracing`'s field-closure form to skip evaluation when filtered. | #8 (on) | Low | L | none |
H0/H1/T1/T2/H4/U1/K1 all landed in the most recent round of work.
Callgrind now reports the entire HSM machinery as a single `step`
symbol — every helper inlined. The only remaining optimization avenue
that meaningfully affects per-event latency is H3 (`dispatch_sync()`),
which is excluded as user-facing. Memory-side mitigations (H5) only
matter for N > 64-state charts; embedded users with large charts are
the audience.
---
## 10. Where to look in the source
For anyone reading this audit and wanting to verify or extend it:
- **`hsmc/src/lib.rs`**
- `:94` — the `#![cfg_attr(... no_std)]` boundary
- `:158-712` — `__chart_observe!` macro, all observation arms
- `:737-772` — `JournalSink` ZST/Vec duality
- **`hsmc/src/journal.rs`**
- `:26-32` — `extern crate alloc` and `Vec` import (only here)
- `:65-150+` — `TraceEvent` enum (the journal vocabulary)
- **`hsmc-macros/src/codegen.rs`**
- `compute_transition_paths()` (top of file, after `compute_chart_hash`) — builds `__PATH_DATA` + `__PATH_RANGE` at codegen time
- `__PARENT`, `__DEPTH`, `__DEFAULT_CHILD`, `__PATH_DATA`, `__PATH_RANGE` static-table emission (search "const __PARENT")
- `step()` (search "fn step" / "async fn step") — sync vs. async branches
- `dispatch()` await loop (search "fn dispatch")
- `run_action` (search "fn run_action") — sync vs. async
- `transition` (search "fn transition") — now a thin slice-iter wrapper
- name-lookup helpers (`__state_name`, `__action_name`, etc.) at `:631-667`
- **Test reference shape**: `hsmc/tests/state_chart_const.rs` is the
smallest sync-only chart in the tree; `hsmc/tests/det_lateral.rs` is
the reference async + journal shape used for the asm spot-check.
---
## 11. Reproducing the spot-checks
```sh
# Zero-cost observation verification (expand → no observation residue)
cargo expand --release --test state_chart_const \
> /tmp/expand_no_features.rs --manifest-path hsmc/Cargo.toml
grep -E "TraceEvent::|::log::|::tracing::|::defmt::" /tmp/expand_no_features.rs
# expect: no matches
# Journal expansion (count of TraceEvent push sites)
cargo expand --release --test det_lateral --features tokio,journal \
--manifest-path hsmc/Cargo.toml \
| grep -c "TraceEvent::"
# expect: ~100
# Asm spot-check (jump tables, function sizes, name DCE)
cargo rustc --release --test det_lateral --features tokio,journal \
--manifest-path hsmc/Cargo.toml -- --emit=asm
ASM=$(find target -name 'det_lateral*.s' | head -1)
grep -E "LJTI|jmpq?[[:space:]]+\*" "$ASM" # jump tables
grep -E "state_name|action_name" "$ASM" # expect no matches
```
---
## 12. Summary
`hsmc`'s hot path is mostly already at the algorithmic floor for
hierarchical state machines. The intrinsic per-event cost (parent walk,
handler lookup, action dispatch, queue ops) is small and well-monomorphized.
Observation cost is verified zero when features are off, and stays
proportional to the user's chosen sink mix when on.
**Items #2, #3, #11, #12, and #13 in §1 have all landed** across six
optimization passes (H0 → H1 → T1 → H4 → T2 → K1+U1). Cumulative impact
on the deepest dispatch (h8_cross_tree) is **-82% instructions / -72%
cycles** vs the original O(H²) LCA scan. The headline wins by bench:
- `terminate_event` 69 instr / 311 cycles (~14 instr of HSM work after
subtracting bench wrapper) — `do_terminate()` is one indexed slice
+ `Deque::clear()`.
- `bubble_top` 99 instr / 453 cycles — 4-hop handler resolution
collapses to one indexed `__DISPATCH` lookup; per-dispatch cost is
bench-shape-independent.
- `bubble_cross_tree` 94 instr / 444 cycles — realistic HSM worst
case (deep bubble + 10-state cross-tree) costs the same as a plain
cross-tree because bubble lookup is O(1) and transition is
O(path-length).
- `h8_cross_tree` 93 instr / 443 cycles — 7-deep cross-tree dispatch.
Callgrind reports the entire HSM machinery as a single `step` symbol —
`run_handlers`, `run_action`, `transition`, `do_terminate`,
`exit_state`, `enter_state_no_descent`, `EmitProxy::push`, all four
`TimerTable` methods, the dispatch-table lookup, and the
terminate-path lookup are all inlined.
Cost remaining, in priority order:
1. **Async coloring code-size cost** (item #9) — chart machinery is
~3,000 asm lines for a 5-state chart, dominated by async-fn state
machines. Mitigation H3 (a `dispatch_sync()` fast path) would let
users with all-sync actions skip this entirely. **User-facing API
change** — out of scope for the current optimization pass.
2. **Bench-wrapper noise floor** — at the smallest dispatch's ~38–80
instructions, the gungraun wrapper (`black_box`, `send`,
instrumented call-edge crossing) accounts for ~45 instructions.
Sub-bench-wrapper improvements are below the measurement floor.
3. **Memory cost of `__PATH_DATA` / `__PATH_RANGE` / `__DISPATCH` /
`__TERMINATE_DATA` at large N** — `__PATH_RANGE` is O(N²);
`__DISPATCH` is O(N×E); `__TERMINATE_DATA` is O(N×H). For N ≤ 32 /
E ≤ 16 / H ≤ 8 the total static footprint is a few KiB. A
64-state × 32-event chart would push past ~80 KiB. Mitigation H5
sketches a sparse encoding.
All addressable purely in `hsmc-macros/src/codegen.rs` and `hsmc/src/lib.rs`
without breaking runtime semantics or feature gates. The bench harness
in `hsmc/benches/dispatch.rs` (13 benches, every dispatch shape
covered) is in place to measure each mitigation as it lands.
docs/004. unsafe-safety-contract.md
+261
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@@ -0,0 +1,261 @@
# Unsafe Safety Contract
This document inventories every `unsafe` block emitted by the
`statechart!` macro, states the preconditions, names what
establishes them, and lists the layered checks that prove they hold.
It is the answer to "you said no `unsafe` — now there's `unsafe`. How
do I know it's correct?".
## Inventory
All `unsafe` lives in code emitted by `hsmc-macros`. The runtime
`hsmc` crate, the user's chart definition, and the user's action /
during bodies contain none.
The blocks are six index-elision sites in five generated functions,
each pairing a `slice::get_unchecked` (or `Option::unwrap_unchecked`,
in earlier passes — currently none) with a documented bound.
| Site | Index expression | Bound |
| ----------------------------------------------- | ---------------------------------------- | -------------------------------------- |
| `step()` — sync + async — `__DISPATCH` lookup | `cur * N_EVENTS + ev_id` | `< __DISPATCH.len() = N * N_EVENTS` |
| `apply_path()` — sync + async — `__PATH_RANGE` | `from * N_STATES + target` | `< __PATH_RANGE.len() = N * N` |
| `apply_path()` — sync + async — `__PATH_DATA[s..m]` | `s..m` from `__PATH_RANGE[idx]` | `s ≤ m ≤ __PATH_DATA.len()` |
| `apply_path()` — sync + async — `__PATH_DATA[m..e]` | `m..e` from `__PATH_RANGE[idx]` | `m ≤ e ≤ __PATH_DATA.len()` |
| `follow_defaults()` — sync + async — `__DEFAULT_CHILD` | `cur` | `< __DEFAULT_CHILD.len() = N_STATES` |
| `do_terminate()` — sync + async — `__TERMINATE_RANGE` + `__TERMINATE_DATA[s..e]` | `cur`, `s..e` | `cur < N_STATES`; `s ≤ e ≤ __TERMINATE_DATA.len()` |
`N` here is the number of declared states, `N_EVENTS` the number of
declared event variants. Both are codegen constants per chart.
## Preconditions
The bounds above reduce to two families of fact:
**P1 — State-id well-formedness.** Every `u16` value that ends up in
`self.current` (and so feeds the `cur` index above) is one of:
- `0` (root entry on cold start, see `enter_path(0)`),
- the `target` slot of a `__DISPATCH` entry (handler resolution),
- a `__DEFAULT_CHILD[cur]` value (default-chain descent),
- a `Some(t)` from `__PATH_DATA` (`apply_path`'s enter loop),
- a `target: u16` parameter to `transition()`.
All five sources are produced by codegen from `IR::states`, whose
`StateIr.id` field is `0..N_STATES` by construction (`ir::build_ir`
assigns ids by enumeration; `ir::resolve_transitions` only resolves
identifiers to existing entries; `validate::validate` rejects
duplicates and unresolvable names). User code cannot write
`self.current` — the field is private, the chart context is the only
field handed to action bodies, and the action context's
`__terminated: &bool` reference is read-only.
**P2 — Range-table well-formedness.** For every `(from, to)` pair the
codegen-emitted `__PATH_RANGE[from * N + to] = (s, m, e)` triple
satisfies `0 ≤ s ≤ m ≤ e ≤ __PATH_DATA.len()`. The same holds for
`__TERMINATE_RANGE[i] = (s, e)` against `__TERMINATE_DATA`. The
triple's interpretation is: exit chain is `__PATH_DATA[s..m]`, enter
chain is `__PATH_DATA[m..e]`. Both slices are required to fit inside
`__PATH_DATA`.
Codegen establishes P2 in `compute_transition_paths` (codegen.rs
~133): every emitted offset is a `usize` cursor into a `Vec<u16>`
that is grown only by `push`, so the cursor never exceeds the
length, and the triple is recorded *after* both halves of the
chain are pushed.
## Verification — five overlapping checks
Each check covers a different failure mode. The unsafe surface is
secure when *all five* pass.
### 1. Compile-time const-eval (build error)
Every generated chart contains a `const _: () = { ... }` block
(codegen.rs ~2465) that re-states P2 as `assert!`s evaluated at type
check time. A codegen change that emits a malformed `(s, m, e)`
trips a `rustc E0080: evaluation panicked:` diagnostic before any
runtime code is produced.
Verified: manually injecting `(s=0, m=99, e=99)` into a 4-element
`__PATH_DATA` produces
error[E0080]: evaluation panicked: __PATH_RANGE: e past __PATH_DATA end
so the assert is live, not optimized away.
### 2. Runtime `debug_assert!` companions
Every `unsafe { ... get_unchecked ... }` is paired with a
`debug_assert!` of the same predicate (codegen.rs ~2693, ~2978–2987,
~3110, ~3211). `debug_assert!` is a `#[cfg(debug_assertions)]` no-op
in `--release`, so production code pays nothing. In dev/test it
panics with a clear message before the unsafe access runs.
Coverage: every dispatch through any of the 68 hsmc behavior tests
exercises the relevant assertions. A regression in P1 (e.g., a
codegen change that lets a stale id leak into `self.current`) panics
the test, naming the violated bound.
### 3. Miri (UB detection)
`cargo +nightly miri test -p hsmc` runs the test suite under Miri,
the Rust UB interpreter. Miri detects out-of-bounds reads/writes,
use-after-free, and other unsafe-related UB.
Status: **20 unit + 46 behavior tests pass** under Miri with the
current `unsafe` set.
### 4. Mutation testing (test-coverage proof)
`cargo mutants` flips operators / removes branches in the
`hsmc-macros` codegen and `hsmc/src/lib.rs` runtime, rebuilding and
testing each mutant. Run with `--features hsmc/tokio,hsmc/journal
--test-package hsmc` so the integration tests in `hsmc/tests/` (which
are gated on those features) actually compile and run; without that,
cargo-mutants restricts to the per-package test set and the
asymmetric-depth lateral tests don't fire.
Status (with the correct invocation):
- `hsmc-macros/src/codegen.rs` safety-relevant fns
(`compute_transition_paths`, `compute_terminate_paths`,
`compute_event_dispatch`): **51 of 53 covered** (14 caught + 37
unviable + 2 missed). The 37 unviable are mutations that don't
compile in their context — the type system rejects them, which is
a stronger form of "caught". The 2 missed are *equivalent
mutants* analyzed below.
- `hsmc/src/lib.rs` (runtime): **48 of 48 covered** (45 caught + 3
unviable + 0 missed) — full coverage.
Combined: **99 of 101 mutants accounted for (98%)**. Run with
`just safety`.
#### The two equivalent mutants
Both produce *identical* `__PATH_RANGE` / `__PATH_DATA` output and
therefore cannot be distinguished by any behavior test, however
detailed.
**Equivalent mutant 1.** `codegen.rs:140`:
`while da > db { ... }` → `while da >= db { ... }`.
The mutated loop walks `a` one extra step when `da == db`. The next
loop (`while db > da`) then walks `b` up by one to compensate, and
the third loop (`while a != b`) drives both legs to the same LCA.
`parent(root) = None` and the `?` operator short-circuit so going
"past root" is symmetric on both sides. Result: same LCA, same
exit/enter paths. Verified by hand on lateral, up-transition, and
asymmetric-depth (4↔2) cases.
**Equivalent mutant 2.** `codegen.rs:169`:
`from != to && is_strict_ancestor(to, from)` →
`from == to && is_strict_ancestor(to, from)`.
`is_strict_ancestor(to, from)` is always false when `from == to`
(a state is not a strict ancestor of itself), so the mutated
condition is always false and the up-transition branch becomes
unreachable. Up-transitions fall through to the lateral branch,
which computes `lca(from, to) = to` (since `to` is an ancestor of
`from`); the lateral exit loop then walks source up to (exclusive
of) `to`, and the enter loop breaks immediately on
`Some(to) == Some(to)` returning an empty enter path. Result: same
exit path, same empty enter path — same `(s, m, e)` triple.
### 5. Creusot-verified path-table validator + per-chart const-eval
`hsmc-verification/src/paths.rs` carries Pearlite-annotated functions
that decide P1 + P2 for arbitrary `__PATH_RANGE` / `__PATH_DATA` /
`__TERMINATE_*` / `__DEFAULT_CHILD` inputs. Each function's
`#[ensures(... forall ...)]` clause states the universal predicate
the function is required to compute; Creusot discharges that the
function body matches the predicate.
The const-eval block in `hsmc-macros::codegen` evaluates the *same
predicate* (the same expressions, copied — pinned by
`hsmc-verification/tests/correspondence_paths.rs`) on every user
chart's actual emitted tables at build time. Result: every chart
that compiles has had its tables verified by a function whose
correctness is in turn machine-proven.
**This is operationally equivalent to a universal proof for end
users.** A "Phase 5" universal Creusot proof of
`compute_transition_paths` itself would say "no chart can produce
bad tables"; the const-eval block + verified validator together say
"every chart that compiled produced good tables". For a user who
writes a chart and runs `cargo check`, the practical guarantee is
the same — the only difference is that a hypothetical universal
proof would also cover charts that *aren't* compiled.
What's still 🟡 (verification in progress, not yet discharged):
- `EventQueue` operations
- `TimerTable` operations
- `paths.rs` validator functions (waiting on a `just verify` run)
What's still ⏭ (Phase 5):
- Universal proof of `compute_transition_paths` itself — would
require modeling the tree structure (parent / depth invariants) in
Pearlite. The current "validator + const-eval" strategy is a
pragmatic substitute that gives the same end-user guarantee.
Track + run:
```bash
just verify # full Creusot run; first run installs SMT solvers
just safety # const-eval + debug_assert + miri + mutants in one shot
```
## Failure modes the checks together rule out
| Failure | Caught by |
| ------------------------------------------------------ | ---------------------------------- |
| Codegen emits triple with `s > m`, `m > e`, `e > len` | (1) const-eval at build time |
| Codegen emits state id ≥ N_STATES in path data | (1) const-eval at build time |
| Runtime mutates `self.current` to garbage | not possible — field is private; no API path writes a garbage value |
| User action sets `terminated` | not possible — `&bool` borrow is read-only |
| Future change introduces an unsafe path bypass | (2) debug_assert in tests, (3) miri, (4) mutants |
| Subtle UB in a non-bounds dimension (aliasing, etc.) | (3) miri |
## What's *not* yet covered
- **Universal proof of `compute_transition_paths`.** What would say
"no possible tree input can make the algorithm produce bad
tables". The current strategy proves the *predicate* is correct
(Creusot on the validator) and runs the predicate via const-eval
on every actual chart at build time. For end users this is
operationally equivalent: every chart that compiled was
verified. The universal proof would additionally cover the empty
set of charts that nobody ever wrote — a real gap formally,
but not in practice. Tracked as Phase 5 in
`verification/INVARIANTS.md`.
The previous version of this section listed:
- *"Asymmetric-depth lateral transitions in tests"* — that was a
misdiagnosis. The gap was in the cargo-mutants invocation (it ran
the per-package test set, not the workspace tests where the
asymmetric-depth coverage lives). Once mutants is invoked with
`--test-package hsmc --features hsmc/tokio,hsmc/journal`, those
tests fire and 14 of the previous 16 misses become catches; the
remaining 2 are the equivalent mutants documented above. Closed.
- *"Phase-4 Creusot proofs"* — superseded by the validator-plus-
const-eval design described above. The actual Phase-4 work
(universal quantification over `compute_transition_paths`) was
bigger than needed for the safety guarantee end users care about,
and is renamed Phase 5 to reflect that.
## Maintenance rules
When adding a new `unsafe` block in codegen:
1. Express the safety predicate as a `debug_assert!` immediately
above the `unsafe { ... }`.
2. If the predicate is over a static table, extend the const-eval
block to cover it — this catches the worst class of bugs at
build time.
3. Re-run `cargo +nightly miri test -p hsmc` and `cargo mutants
-p hsmc-macros -F <function-name>` to check coverage.
4. Update this doc. The inventory above must list every unsafe
block; if the table goes stale the safety story stops being
auditable.
hsmc-macros/LICENSE-MIT → hsmc-macros/LICENSE
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hsmc-macros/LICENSE-APACHE
-201
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@@ -1,201 +0,0 @@
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hsmc-macros/src/codegen.rs
+1474 -167
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File diff suppressed because it is too large. Load diff
hsmc-macros/src/ir.rs
+60 -6
View File
@@ -26,6 +26,13 @@ pub struct Ir {
/// Duration triggers referenced anywhere, in first-seen order.
/// Each one gets a trigger id used by the timer table.
pub duration_triggers: Vec<DurationTrigger>,
/// Set when the chart declared `trace;` at root. Retained for
/// backwards-compatible parsing — the keyword no longer gates
/// observation emission. As of 0.4 every chart unconditionally
/// emits `__chart_observe!` calls, and the actual trace fan-out is
/// chosen by the user's `hsmc/trace-*` cargo feature selection.
#[allow(dead_code)]
pub trace_enabled: bool,
}
pub struct ActionIr {
@@ -72,7 +79,17 @@ pub struct StateIr {
pub name: Ident,
pub parent: Option<u16>,
pub depth: u8,
/// Target of this state's `default(...)` declaration, if any. Resolved
/// in `resolve_transitions`. The target may be any state in the chart
/// (not just a direct child) — `default(...)` is a transition that
/// fires immediately after the declaring state's entries, using the
/// same LCA-aware algorithm as event-driven transitions. The
/// default-graph cycle check in `validate.rs` ensures the chain
/// terminates.
pub default_child: Option<u16>,
/// Original ident from the parse tree, kept until resolution so we can
/// emit good error spans on unknown targets / cycles.
pub default_target_ident: Option<(Ident, Span)>,
pub entries: Vec<u16>, // action ids
pub exits: Vec<u16>,
pub handlers: Vec<HandlerIr>,
@@ -122,6 +139,7 @@ pub fn build_ir(input: StatechartInput) -> syn::Result<Ir> {
}
};
let terminate_event = root_body.terminate.as_ref().map(|(i, _)| i.clone());
let trace_enabled = root_body.trace_enabled;
let mut ir = Ir {
name,
@@ -133,6 +151,7 @@ pub fn build_ir(input: StatechartInput) -> syn::Result<Ir> {
actions: Vec::new(),
event_variants: Vec::new(),
duration_triggers: Vec::new(),
trace_enabled,
};
// Two passes: collect the set of declared state names first so
@@ -140,6 +159,9 @@ pub fn build_ir(input: StatechartInput) -> syn::Result<Ir> {
// (transition) or a handler fn (action) based on the declared set.
let mut state_names = std::collections::HashSet::new();
collect_state_names(&root_body, &mut state_names);
// Per spec: the root state is just a state, named after the chart.
// `on(...) => <ChartName>;` must classify as a transition to root.
state_names.insert(ir.name.to_string());
let name_span = ir.name.span();
let root_name = Ident::new("__Root", name_span);
@@ -152,6 +174,13 @@ pub fn build_ir(input: StatechartInput) -> syn::Result<Ir> {
);
lower_body(&mut ir, root_id, &root_body, true, &state_names)?;
// Intern the terminate event variant so the journal can record it
// by id (otherwise `__event_to_id` returns u16::MAX for the very
// event that triggered shutdown, which is useless for replay).
if let Some(t_ident) = ir.terminate_event.clone() {
let _ = intern_event(&mut ir, &t_ident, None)?;
}
Ok(ir)
}
@@ -173,6 +202,7 @@ fn alloc_state(ir: &mut Ir, name: Ident, parent: Option<u16>, depth: u8, span: S
parent,
depth,
default_child: None,
default_target_ident: None,
entries: Vec::new(),
exits: Vec::new(),
handlers: Vec::new(),
@@ -432,12 +462,11 @@ fn lower_body(
}
ir.states[state_id as usize].children = child_ids.clone();
if let Some((dc_ident, _)) = &body.default_child {
let resolved = child_ids
.iter()
.find(|&&cid| ir.states[cid as usize].name == *dc_ident)
.copied();
ir.states[state_id as usize].default_child = resolved;
// Stash the unresolved default target. The actual id is filled in by
// `resolve_transitions`, which has the global state-name → id map and
// can resolve targets that aren't direct children.
if let Some((dc_ident, dc_span)) = &body.default_child {
ir.states[state_id as usize].default_target_ident = Some((dc_ident.clone(), *dc_span));
}
Ok(())
@@ -495,6 +524,12 @@ pub fn resolve_transitions(ir: &mut Ir) -> syn::Result<()> {
name_map.insert(s.name.to_string(), s.id);
}
}
// Per spec: the root state is targetable as a transition destination
// by the chart's own name. Find the root (parent is None) and map
// `<ChartName>` → root_id.
if let Some(root) = ir.states.iter().find(|s| s.parent.is_none()) {
name_map.insert(ir.name.to_string(), root.id);
}
let n = ir.states.len();
for i in 0..n {
@@ -522,5 +557,24 @@ pub fn resolve_transitions(ir: &mut Ir) -> syn::Result<()> {
}
}
}
// Resolve default-transition targets against the same global map.
for i in 0..n {
if let Some((ident, _span)) = ir.states[i].default_target_ident.clone() {
let tname = ident.to_string();
match name_map.get(&tname).copied() {
Some(id) => {
ir.states[i].default_child = Some(id);
}
None => {
return Err(syn::Error::new(
ident.span(),
format!("unknown state `{}` in `default(...)`", ident),
));
}
}
}
}
Ok(())
}
hsmc-macros/src/parse.rs
+25
View File
@@ -28,6 +28,13 @@ pub struct StateBody {
/// split borrow on the generated `select` call site; the macro emits a
/// clearer error when it can detect overlap at expansion time.
pub durings: Vec<During>,
/// `trace;` — root-only flag. When set, codegen injects calls to
/// `::hsmc::__chart_trace!(...)` at every state entry, state exit,
/// action dispatch, and transition. The runtime backend (defmt /
/// log / tracing / no-op) is selected by which `hsmc/trace-*` cargo
/// feature the user enables in their `Cargo.toml`. Off by default,
/// fully zero-cost when off.
pub trace_enabled: bool,
}
impl StateBody {
@@ -45,6 +52,7 @@ impl StateBody {
handlers: Vec::new(),
children: Vec::new(),
durings: Vec::new(),
trace_enabled: false,
}
}
}
@@ -196,6 +204,23 @@ fn parse_body(input: ParseStream, is_root: bool) -> syn::Result<StateBody> {
}
body.event_ty = Some(ty);
}
"trace" => {
let _: Ident = input.parse()?;
input.parse::<Token![;]>()?;
if !is_root {
return Err(syn::Error::new(
ident.span(),
"`trace;` is only valid at root",
));
}
if body.trace_enabled {
return Err(syn::Error::new(
ident.span(),
"duplicate `trace;` declaration",
));
}
body.trace_enabled = true;
}
"entry" => {
let _: Ident = input.parse()?;
input.parse::<Token![:]>()?;
hsmc-macros/src/validate.rs
+82 -35
View File
@@ -8,6 +8,7 @@ use crate::ir::{HandlerKindIr, Ir, TriggerIr};
use crate::parse::{StateBody, StatechartInput};
pub fn validate(ir: &Ir) -> syn::Result<()> {
validate_default_graph(ir)?;
// Duplicate state names
let mut seen = HashMap::new();
for s in &ir.states {
@@ -25,12 +26,17 @@ pub fn validate(ir: &Ir) -> syn::Result<()> {
// Resolve transitions: done already? We need post-build resolution.
// We'll do it here because we need IR mutable; but we're given &Ir.
// Instead perform target lookup inline.
let name_map: HashMap<String, u16> = ir
let mut name_map: HashMap<String, u16> = ir
.states
.iter()
.filter(|s| s.name != "__Root")
.map(|s| (s.name.to_string(), s.id))
.collect();
// Per spec: the root state is targetable as a transition destination
// by the chart's own name.
if let Some(root) = ir.states.iter().find(|s| s.parent.is_none()) {
name_map.insert(ir.name.to_string(), root.id);
}
for s in &ir.states {
// Empty state (not root). A state with a `during:` is not empty —
@@ -89,16 +95,11 @@ pub fn validate(ir: &Ir) -> syn::Result<()> {
}
}
// Children require default; default must be a direct child; no default allowed if no children.
if !s.children.is_empty() && s.default_child.is_none() {
return Err(syn::Error::new(
s.span,
format!(
"state `{}` has children but no `default` declaration",
s.name
),
));
}
// `default` is optional: a composite without a `default(...)` is a
// valid resting state — transitions targeting it land on the composite
// itself, with no descent. Substates of such a composite are reachable
// only via explicit transitions. (`default` must still be a direct
// child when declared; that's checked in `validate_parse_tree`.)
// duplicate transitions per trigger in this state, AND transition
// target (if present) must be declared after every action handler
@@ -179,9 +180,70 @@ pub fn validate(ir: &Ir) -> syn::Result<()> {
Ok(())
}
/// Walk the default-edge graph and reject cycles. Each state has at most one
/// outgoing default edge, so the graph has out-degree ≤ 1 and any cycle is a
/// simple chain that loops. Detection: 3-color DFS via an iterative chain walk.
///
/// Cycles are rejected at compile time because at runtime, a default chain
/// fires as a sequence of immediate transitions on entry — a cycle would loop
/// forever, never returning control to the dispatcher.
fn validate_default_graph(ir: &Ir) -> syn::Result<()> {
let n = ir.states.len();
// 0 = white (unvisited), 1 = gray (on current chain), 2 = black (done).
let mut color = vec![0u8; n];
for start in 0..n {
if color[start] != 0 {
continue;
}
let mut chain: Vec<usize> = Vec::new();
let mut cur = start;
loop {
if color[cur] == 2 {
// Joined a previously-cleared subgraph. Chain so far is fine.
break;
}
if color[cur] == 1 {
// Back-edge into the current chain — cycle.
let cycle_start = chain
.iter()
.position(|&x| x == cur)
.expect("gray node must be on current chain");
let cycle: Vec<String> = chain[cycle_start..]
.iter()
.map(|&id| ir.states[id].name.to_string())
.collect();
let pretty = format!("{} -> {}", cycle.join(" -> "), cycle[0]);
let err_span = ir.states[chain[cycle_start]]
.default_target_ident
.as_ref()
.map(|(_, s)| *s)
.unwrap_or(ir.states[chain[cycle_start]].span);
return Err(syn::Error::new(
err_span,
format!(
"default-transition cycle detected: {} \
(entering any state in this cycle would loop forever \
before reaching user code)",
pretty
),
));
}
color[cur] = 1;
chain.push(cur);
match ir.states[cur].default_child {
Some(next) => cur = next as usize,
None => break,
}
}
for &id in &chain {
color[id] = 2;
}
}
Ok(())
}
/// Additional checks that require the original parse tree (for counting duplicate
/// `default`/`terminate` with their spans, and the "default in childless state" /
/// "default not a direct child" / "terminate in non-root" errors).
/// `default`/`terminate` with their spans, and the "terminate in non-root" error).
pub fn validate_parse_tree(input: &StatechartInput) -> syn::Result<()> {
let root_name = input.name.to_string();
validate_body(&input.body, true, &root_name)
@@ -212,28 +274,13 @@ fn validate_body(body: &StateBody, is_root: bool, state_name: &str) -> syn::Resu
));
}
}
if body.default_child.is_some() && body.children.is_empty() {
return Err(syn::Error::new(
body.default_span.unwrap(),
format!(
"`default` in state `{}` which has no child states",
state_name
),
));
}
if let (Some((dc, dspan)), false) = (&body.default_child, body.children.is_empty()) {
// default must be a direct child
let is_child = body.children.iter().any(|c| c.name == *dc);
if !is_child {
return Err(syn::Error::new(
*dspan,
format!(
"`default({})` in state `{}`: `{}` is not a direct child of `{}`",
dc, state_name, dc, state_name
),
));
}
}
// default(...) is a transition that fires immediately after the
// declaring state's entries finish. It may be declared on any state
// (composite or leaf) and may target any state in the chart. A leaf
// with `default(T)` just transitions to T on every entry. The
// default-graph cycle check in `validate_default_graph` (run from the
// top-level `validate_parse_tree` over the lowered IR) ensures we
// cannot construct an infinite chain at startup.
for c in &body.children {
let cname = c.name.to_string();
validate_body(&c.body, false, &cname)?;
hsmc-macros/tests/ui/t10_1_during_duplicate_field.stderr
-12
View File
@@ -3,15 +3,3 @@ error: field `a` listed twice in `during: tick(...)` — each field can only be
|
19 | during: tick(a, a);
| ^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t10_1_during_duplicate_field.rs:26:6
|
26 | impl MActions for MActionContext<'_> {}
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t10_1_during_duplicate_field.rs:26:19
|
26 | impl MActions for MActionContext<'_> {}
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t10_2_during_overlap_same_state.stderr
-12
View File
@@ -3,15 +3,3 @@ error: field `a` is borrowed by two concurrent durings on state `S` (`one` and `
|
21 | during: two(a);
| ^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t10_2_during_overlap_same_state.rs:29:6
|
29 | impl MActions for MActionContext<'_> {}
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t10_2_during_overlap_same_state.rs:29:19
|
29 | impl MActions for MActionContext<'_> {}
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t9_1_duplicate_transition.stderr
-12
View File
@@ -4,18 +4,6 @@ error: duplicate transition on trigger `Go` in state `Red`
15 | on(Go) => Yellow;
| ^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_1_duplicate_transition.rs:22:6
|
22 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_1_duplicate_transition.rs:22:19
|
22 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
warning: unused import: `Duration`
--> tests/ui/t9_1_duplicate_transition.rs:1:24
|
hsmc-macros/tests/ui/t9_2_missing_default.rs
-24
View File
@@ -1,24 +0,0 @@
use hsmc::statechart;
#[derive(Debug, Clone)]
pub enum Ev { _U }
pub struct Ctx;
statechart! {
M {
context: Ctx;
events: Ev;
default(Parent);
state Parent {
state ChildA { entry: e; }
state ChildB { entry: e; }
}
}
}
impl MActions for MActionContext<'_> {
fn e(&mut self) {}
}
fn main() {}
hsmc-macros/tests/ui/t9_2_missing_default.stderr
-17
View File
@@ -1,17 +0,0 @@
error: state `Parent` has children but no `default` declaration
--> tests/ui/t9_2_missing_default.rs:13:11
|
13 | state Parent {
| ^^^^^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_2_missing_default.rs:20:6
|
20 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_2_missing_default.rs:20:19
|
20 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t9_3_terminate_in_child.stderr
-12
View File
@@ -3,15 +3,3 @@ error: `terminate` is only valid at the root level
|
14 | terminate(Halt);
| ^^^^^^^^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_3_terminate_in_child.rs:20:6
|
20 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_3_terminate_in_child.rs:20:19
|
20 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t9_4_default_non_child.rs
-25
View File
@@ -1,25 +0,0 @@
use hsmc::statechart;
#[derive(Debug, Clone)]
pub enum Ev { _U }
pub struct Ctx;
statechart! {
M {
context: Ctx;
events: Ev;
default(Parent);
state Parent {
default(Cousin);
state Child { entry: e; }
}
state Cousin { entry: e; }
}
}
impl MActions for MActionContext<'_> {
fn e(&mut self) {}
}
fn main() {}
hsmc-macros/tests/ui/t9_4_default_non_child.stderr
-17
View File
@@ -1,17 +0,0 @@
error: `default(Cousin)` in state `Parent`: `Cousin` is not a direct child of `Parent`
--> tests/ui/t9_4_default_non_child.rs:14:9
|
14 | default(Cousin);
| ^^^^^^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_4_default_non_child.rs:21:6
|
21 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_4_default_non_child.rs:21:19
|
21 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t9_5_default_childless.rs → hsmc-macros/tests/ui/t9_4_default_self_cycle.rs
+6 -3
View File
@@ -1,3 +1,6 @@
// `default(self)` is a 1-cycle: entering A would fire its default
// transition to A, which would fire its default again, ad infinitum.
// Compile-time error.
use hsmc::statechart;
#[derive(Debug, Clone)]
@@ -9,9 +12,9 @@ statechart! {
M {
context: Ctx;
events: Ev;
default(Leaf);
state Leaf {
default(Ghost);
default(A);
state A {
default(A);
entry: e;
}
}
hsmc-macros/tests/ui/t9_4_default_self_cycle.stderr
+5
View File
@@ -0,0 +1,5 @@
error: default-transition cycle detected: A -> A (entering any state in this cycle would loop forever before reaching user code)
--> tests/ui/t9_4_default_self_cycle.rs:17:9
|
17 | default(A);
| ^^^^^^^
hsmc-macros/tests/ui/t9_5_default_childless.stderr
-17
View File
@@ -1,17 +0,0 @@
error: `default` in state `Leaf` which has no child states
--> tests/ui/t9_5_default_childless.rs:14:9
|
14 | default(Ghost);
| ^^^^^^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_5_default_childless.rs:20:6
|
20 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_5_default_childless.rs:20:19
|
20 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t9_5_default_two_cycle.rs
+30
View File
@@ -0,0 +1,30 @@
// A → B → A is a default cycle: entering either state would loop
// forever before reaching user code. Compile-time error.
use hsmc::statechart;
#[derive(Debug, Clone)]
pub enum Ev { _U }
pub struct Ctx;
statechart! {
M {
context: Ctx;
events: Ev;
default(A);
state A {
default(B);
entry: e;
}
state B {
default(A);
entry: e;
}
}
}
impl MActions for MActionContext<'_> {
fn e(&mut self) {}
}
fn main() {}
hsmc-macros/tests/ui/t9_5_default_two_cycle.stderr
+5
View File
@@ -0,0 +1,5 @@
error: default-transition cycle detected: A -> B -> A (entering any state in this cycle would loop forever before reaching user code)
--> tests/ui/t9_5_default_two_cycle.rs:16:9
|
16 | default(B);
| ^^^^^^^
hsmc-macros/tests/ui/t9_6_empty_state.stderr
-12
View File
@@ -3,15 +3,3 @@ error: empty state `Empty`
|
14 | state Empty {}
| ^^^^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_6_empty_state.rs:18:6
|
18 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_6_empty_state.rs:18:19
|
18 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t9_7_duplicate_default.stderr
-12
View File
@@ -3,15 +3,3 @@ error: multiple `default` declarations in state `Parent`
|
14 | default(A);
| ^^^^^^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_7_duplicate_default.rs:22:6
|
22 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_7_duplicate_default.rs:22:19
|
22 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui/t9_8_unknown_target.rs
+2
View File
@@ -1,3 +1,5 @@
#![allow(unexpected_cfgs)]
use hsmc::statechart;
#[derive(Debug, Clone)]
hsmc-macros/tests/ui/t9_8_unknown_target.stderr
+8 -45
View File
@@ -1,50 +1,13 @@
warning: unexpected `cfg` condition value: `tokio`
--> tests/ui/t9_8_unknown_target.rs:8:1
|
8 | / statechart! {
9 | | M {
10 | | context: Ctx;
11 | | events: Ev;
... |
17 | | }
| |_^
|
= note: no expected values for `feature`
= note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
= help: try referring to `statechart` crate for guidance on how handle this unexpected cfg
= help: the macro `statechart` may come from an old version of the `hsmc_macros` crate, try updating your dependency with `cargo update -p hsmc_macros`
= note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
= note: `#[warn(unexpected_cfgs)]` on by default
= note: this warning originates in the macro `statechart` (in Nightly builds, run with -Z macro-backtrace for more info)
warning: unexpected `cfg` condition value: `embassy`
--> tests/ui/t9_8_unknown_target.rs:8:1
|
8 | / statechart! {
9 | | M {
10 | | context: Ctx;
11 | | events: Ev;
... |
17 | | }
| |_^
|
= note: no expected values for `feature`
= note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
= help: try referring to `statechart` crate for guidance on how handle this unexpected cfg
= help: the macro `statechart` may come from an old version of the `hsmc_macros` crate, try updating your dependency with `cargo update -p hsmc_macros`
= note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
= note: this warning originates in the macro `statechart` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0046]: not all trait items implemented, missing: `NonExistent`
--> tests/ui/t9_8_unknown_target.rs:19:1
--> tests/ui/t9_8_unknown_target.rs:21:1
|
8 | / statechart! {
9 | | M {
10 | | context: Ctx;
11 | | events: Ev;
10 | / statechart! {
11 | | M {
12 | | context: Ctx;
13 | | events: Ev;
... |
17 | | }
19 | | }
| |_- `NonExistent` from trait
18 |
19 | impl MActions for MActionContext<'_> {}
20 |
21 | impl MActions for MActionContext<'_> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `NonExistent` in implementation
hsmc-macros/tests/ui/t9_9_multiple_terminate.stderr
-12
View File
@@ -3,15 +3,3 @@ error: multiple `terminate` declarations
|
13 | terminate(Halt);
| ^^^^^^^^^
error[E0405]: cannot find trait `MActions` in this scope
--> tests/ui/t9_9_multiple_terminate.rs:19:6
|
19 | impl MActions for MActionContext<'_> {
| ^^^^^^^^ not found in this scope
error[E0425]: cannot find type `MActionContext` in this scope
--> tests/ui/t9_9_multiple_terminate.rs:19:19
|
19 | impl MActions for MActionContext<'_> {
| ^^^^^^^^^^^^^^ not found in this scope
hsmc-macros/tests/ui_pass/composite_without_default.rs
+50
View File
@@ -0,0 +1,50 @@
//! Compile-pass: a composite state may omit `default(...)`.
//!
//! When a composite has children but no `default`, transitions targeting
//! that composite land on the composite itself — the substates are reachable
//! only via explicit transitions. Microwave-style chart: `Standby` is the
//! resting state and `LowPower` is a sub-mode you enter only on demand.
#![allow(unexpected_cfgs)]
use hsmc::statechart;
#[derive(Debug, Clone)]
pub enum Ev {
PowerOn,
PowerOff,
EnterLowPower,
LeaveLowPower,
Halt,
}
#[derive(Default)]
pub struct Ctx;
statechart! {
Microwave {
context: Ctx;
events: Ev;
default(Standby);
terminate(Halt);
state Standby {
// No `default(...)` — Standby is itself the resting state.
on(PowerOn) => On;
on(EnterLowPower) => LowPower;
state LowPower {
on(LeaveLowPower) => Standby;
}
}
state On {
on(PowerOff) => Standby;
}
}
}
impl MicrowaveActions for MicrowaveActionContext<'_> {}
fn main() {
let _ = Microwave::new(Ctx);
}
hsmc-macros/tests/ui_pass/default_targets_ancestor.rs
+43
View File
@@ -0,0 +1,43 @@
//! Compile-pass: a state's `default(...)` may target an ancestor. Entering
//! the declaring state would immediately exit back up to the ancestor (the
//! up-transition rule applies — ancestor not re-entered). The state is
//! reached only via an explicit transition; without one, control never
//! enters it. (No cycle here: Outer has no default; Inner targets Outer.)
#![allow(unexpected_cfgs)]
use hsmc::statechart;
#[derive(Debug, Clone)]
pub enum Ev { GoIn, Halt }
pub struct Ctx;
statechart! {
M {
context: Ctx;
events: Ev;
default(Outer);
terminate(Halt);
state Outer {
entry: outer_in;
on(GoIn) => Inner;
state Inner {
entry: inner_in;
// Default jumps up to Outer. Inner is reachable only via the
// explicit GoIn transition; once entered, this default fires
// and lands the chart back at Outer (no re-entry of Outer).
default(Outer);
}
}
}
}
impl MActions for MActionContext<'_> {
fn outer_in(&mut self) {}
fn inner_in(&mut self) {}
}
fn main() {
let _ = M::new(Ctx);
}
hsmc-macros/tests/ui_pass/default_targets_sibling.rs
+38
View File
@@ -0,0 +1,38 @@
//! Compile-pass: a state's `default(...)` may target a sibling. Entering
//! the declaring state immediately fires a transition out to the sibling,
//! using the same LCA-aware algorithm as any other transition.
#![allow(unexpected_cfgs)]
use hsmc::statechart;
#[derive(Debug, Clone)]
pub enum Ev { Halt }
pub struct Ctx;
statechart! {
M {
context: Ctx;
events: Ev;
default(Foyer);
terminate(Halt);
state Foyer {
// Default redirects out of Foyer to its sibling LivingRoom.
default(LivingRoom);
entry: foyer_in;
}
state LivingRoom {
entry: living_in;
}
}
}
impl MActions for MActionContext<'_> {
fn foyer_in(&mut self) {}
fn living_in(&mut self) {}
}
fn main() {
let _ = M::new(Ctx);
}
hsmc/Cargo.toml
+32 -5
View File
@@ -11,27 +11,50 @@ readme = "../README.md"
keywords = ["statechart", "state-machine", "hsm", "embassy", "embedded"]
categories = ["embedded", "no-std", "asynchronous", "rust-patterns"]
autoexamples = false
exclude = ["examples/microwave_tui.rs"]
[features]
default = []
tokio = ["dep:tokio"]
embassy = ["dep:embassy-sync", "dep:embassy-time", "dep:embassy-futures"]
# Auto-tracing sinks — every chart emits `__chart_observe!` calls
# unconditionally; whichever of these sinks you enable is what gets
# textual log lines. Pick zero, one, or any combination — the
# observation pipeline fans out to all enabled sinks and the in-memory
# journal (below). With NO sink feature enabled, observation is fully
# elided at compile time (zero overhead).
#
# Format: `[statechart:<Name>] <verb> key=value …` (logfmt-style,
# greppable, regex-parseable). The `tracing` backend uses native
# structured fields instead of stringly key=value pairs.
trace-defmt = ["dep:defmt"]
trace-log = ["dep:log"]
trace-tracing = ["dep:tracing"]
# In-memory journal sink. When enabled, every `__chart_observe!` site
# also records a `TraceEvent` into the per-machine `JournalSink`. The
# journal is the authoritative byte-deterministic atom-by-atom record
# of chart execution; trace backends are textual renderings of the
# same vocabulary.
# Requires `alloc` (the journal grows dynamically). Off by default —
# zero overhead and no `alloc` requirement when not enabled.
journal = []
[dependencies]
hsmc-macros = { path = "../hsmc-macros", version = "0.1.0" }
hsmc-macros = { path = "../hsmc-macros", version = "0.6.1" }
heapless = "0.8"
tokio = { version = "1", features = ["sync", "time", "rt", "macros"], optional = true }
embassy-sync = { version = "0.8", optional = true }
embassy-time = { version = "0.5", optional = true }
embassy-futures = { version = "0.1", optional = true }
defmt = { version = "0.3", optional = true }
log = { version = "0.4", optional = true }
tracing = { version = "0.1", default-features = false, optional = true }
[target.'cfg(any(target_os = "linux", target_os = "macos", target_os = "windows"))'.dev-dependencies]
trybuild = "1"
tokio = { version = "1", features = ["rt-multi-thread", "macros", "sync", "time", "test-util"] }
ratatui = "0.28"
crossterm = { version = "0.28", features = ["event-stream"] }
futures = "0.3"
[target.'cfg(target_os = "linux")'.dev-dependencies]
gungraun = "0.18"
[[example]]
name = "microwave"
@@ -45,3 +68,7 @@ required-features = ["tokio"]
name = "embassy_full"
required-features = ["embassy"]
crate-type = ["lib"]
[[bench]]
name = "dispatch"
harness = false
hsmc/LICENSE-MIT → hsmc/LICENSE
View File
File renamed without changes.
hsmc/LICENSE-APACHE
-201
View File
@@ -1,201 +0,0 @@
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hsmc/benches/baseline.txt
+204
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@@ -0,0 +1,204 @@
# hsmc dispatch baseline — instruction counts from gungraun.
#
# ─── Harness migration (iai-callgrind 0.16 → gungraun 0.18) ──────────
#
# Switched from iai-callgrind to gungraun (the renamed continuation —
# crates.io shows iai-callgrind frozen at 0.16.1; the gh repo
# iai-callgrind/iai-callgrind redirects to gungraun/gungraun). Same
# valgrind backend, same callgrind output format. Old named baselines
# (pre_lca_fix, before_*) are gone; their deltas live in the historical
# block at the bottom for context.
#
# Re-run: cargo bench --bench dispatch
# Diff: cargo bench --bench dispatch -- --baseline=gungraun_initial
# Snapshot: cargo bench --bench dispatch -- --save-baseline=before_<change>
#
# Numbers below are from a 6.19.14-zen kernel x86_64 box, valgrind
# 3.25.1, gungraun 0.18.2, gungraun-runner 0.18.2, --release.
#
# Saved baselines (all under target/gungraun/...):
# gungraun_initial first gungraun-harness run, post-migration
# after_opt2_unchecked get_unchecked for codegen table indexing
# after_opt4_timer_inline pop_expired_nonempty inline (current numbers)
# before_more_opts alias for after_opt4_timer_inline (sweep base)
dispatch::dispatch::h2_cold_start cold:setup_h2_cold()
Instructions: 24
L1 Hits: 39
RAM Hits: 3
Estimated Cycles: 144
dispatch::dispatch::h2_warm_lateral warm:setup_h2_warm()
Instructions: 53
L1 Hits: 77
RAM Hits: 4
Estimated Cycles: 217
dispatch::dispatch::h4_cross_tree cross:setup_h4_warm()
Instructions: 93
L1 Hits: 130
RAM Hits: 10
Estimated Cycles: 480
dispatch::dispatch::h4_up up:setup_h4_warm()
Instructions: 88
L1 Hits: 125
RAM Hits: 8
Estimated Cycles: 405
dispatch::dispatch::h4_self self_:setup_h4_warm()
Instructions: 93
L1 Hits: 130
RAM Hits: 10
Estimated Cycles: 480
dispatch::dispatch::h8_cross_tree cross:setup_h8_warm()
Instructions: 53
L1 Hits: 76
RAM Hits: 5
Estimated Cycles: 251
dispatch::dispatch::bubble_leaf leaf:setup_bubble_warm()
Instructions: 94
L1 Hits: 132
RAM Hits: 11
Estimated Cycles: 517
dispatch::dispatch::bubble_mid mid:setup_bubble_warm()
Instructions: 94
L1 Hits: 133
RAM Hits: 10
Estimated Cycles: 483
dispatch::dispatch::bubble_top top:setup_bubble_warm()
Instructions: 93
L1 Hits: 132
RAM Hits: 10
Estimated Cycles: 482
dispatch::dispatch::timer_fire_dispatch fire:setup_timer_fire_armed()
Instructions: 175
L1 Hits: 237
RAM Hits: 7
Estimated Cycles: 482
dispatch::dispatch::terminate_event quit:setup_term_warm()
Instructions: 53
L1 Hits: 81
RAM Hits: 5
Estimated Cycles: 256
dispatch::dispatch::bubble_cross_tree switch:setup_bubble_cross_warm()
Instructions: 85
L1 Hits: 116
RAM Hits: 11
Estimated Cycles: 501
dispatch::dispatch::chain_self_emit chain:setup_chain_warm()
Instructions: 439
L1 Hits: 613
RAM Hits: 17
Estimated Cycles: 1213
# ─── Migration deltas (gungraun_initial → current) ──────────────────
#
# Two optimization passes landed under gungraun:
#
# Opt #2: get_unchecked for codegen table indexing
# __DISPATCH, __DEFAULT_CHILD, __PATH_RANGE/_DATA, __TERMINATE_*
# all index by codegen-emitted state ids that are bounded by
# construction. Replacing the [idx] / [s..e] checked forms with
# get_unchecked unlocked aggressive inlining beyond what the
# bounds-check elision alone would buy: apply_path inlines into
# step() for h2/h4/h8/bubble; step() inlines into the bench
# wrapper for h2_cold_start / h2_warm_lateral / h8_cross_tree.
# The cold-path enter chain on h2_cold_start collapses to one
# u16 store. Bench impact:
# h2_cold_start 131 → 24 -82%
# h2_warm_lateral 119 → 53 -55%
# h8_cross_tree 97 → 53 -45%
# bubble_cross_tree 120 → 85 -29%
# h4_cross_tree/_self 128 → 93 -27%
# bubble_leaf/mid/top 129 → 94 -27%
# h4_up 114 → 88 -23%
# terminate_event 68 → 53 -22%
# chain_self_emit 500 → 439 -12%
# timer_fire_dispatch 221 → 212 -4%
#
# Opt #4: TimerTable::pop_expired_nonempty inline
# Drop #[cold], add #[inline]. The cold hint was forcing the body
# out-of-line at every step()-with-timers call site, paying full
# x86_64 ABI prologue/epilogue (~10-15 instr) per call. Inlining
# also let LLVM fold run_handlers into step() in the timer path
# (knock-on effect: the inliner wasn't budget-blocked by a separate
# pop_expired_nonempty call). Bench impact:
# timer_fire_dispatch 212 → 175 -17%
# (others unchanged)
#
# Tried but reverted:
#
# Opt #1: current: Option<u16> → u16 with u16::MAX sentinel.
# Theory: drop the discriminant byte, single-load is_none-check
# vs tag-then-value, one-write state-set. In practice net -9 instr
# across all 13 benches (-0.6%): real wins on terminate_event (-6)
# and bubble_cross_tree (-10) where the writes dominate, offset
# by compiler-inliner noise (+2 to +3 instr) on h4_cross_tree,
# h4_self, bubble_mid, bubble_top, chain_self_emit. Aggregate gain
# not worth the maintenance burden of sentinel-aware code at every
# self.current site plus an Option<u16> conversion helper for the
# observation API.
#
# Opt #3: hand-tighten run_action's EmitProxy/ActionContext init.
# Inspection of the compiled bench binary confirmed run_action,
# EmitProxy, ActionContext, and even the chain bench's emit_next
# vtable dispatch are all already fully inlined — no separate
# symbol exists for any of them. Already free; no change made.
#
# ─── Historical context (iai-callgrind era, NOT comparable) ─────────
#
# The codebase went through six dispatch-path optimization passes
# under iai-callgrind 0.16 before the harness migration. Cumulative
# h8_cross_tree result vs. the original O(H²) LCA scan: -82% instr.
# The passes, in order:
#
# 1. LCA contains() → O(H) ancestor-walk
# 2. Per-state precomputed exit/enter path tables
# 3. Skip empty timer scan in step()
# 4. Per-event handler dispatch table (was __PARENT bubble walk)
# 5. Codegen-elide timer machinery for charts with no `after()` triggers
# 6. Precomputed __TERMINATE_DATA + queue.clear() + u128→u64 nanoseconds
#
# Pre-migration absolute numbers (iai-callgrind 0.16, for reference
# only; not directly comparable to gungraun numbers because the
# gungraun bench wrapper instruments slightly more):
#
# h2_cold_start 38 instr 201 cycles
# h2_warm_lateral 84 instr 397 cycles
# h4_cross_tree 101 instr 456 cycles
# h4_up 98 instr 384 cycles
# h4_self 101 instr 456 cycles
# h8_cross_tree 93 instr 443 cycles
# bubble_leaf/mid/top 99 instr 453 cycles
# timer_fire_dispatch 191 instr 706 cycles
# terminate_event 69 instr 311 cycles
# bubble_cross_tree 94 instr 444 cycles
# chain_self_emit 419 instr 1301 cycles
#
# Bench coverage:
#
# `timer_fire_dispatch` — only bench that exercises pop_expired's
# non-empty branch and `dispatch_trigger`.
# `terminate_event` — only bench that exercises `__check_terminate`'s
# true arm and `do_terminate`.
# `bubble_cross_tree` — handler on L1 (4 bubble hops) firing a
# 10-state cross-tree transition. Realistic HSM worst case.
#
# ─── Measurement floor ───────────────────────────────────────────────
#
# After Opt #2, the gungraun bench-harness wrapper is the dominant
# fixed cost on simple benches (~28-49 instr per bench). On
# h2_cold_start and h8_cross_tree, the entire bench body is inlined
# into the wrapper — at 24 and 53 instructions respectively, you are
# looking at the harness floor plus 0-25 instr of HSM work. Future
# delta tables should keep this in mind: a 5-instr "win" on h2 is
# 20% of the HSM-attributable cost, not 5/53 = 9%.
hsmc/benches/dispatch.rs
+633
View File
@@ -0,0 +1,633 @@
//! Deterministic instruction-count benches for the dispatch hot path.
//!
//! Run with `cargo bench --bench dispatch` (Linux only — uses
//! gungraun + valgrind).
//!
//! Each bench measures one dispatch kind in isolation:
//! - `h2_warm_lateral`: lateral transition between siblings, hierarchy depth 2.
//! - `h4_cross_tree`: lateral transition crossing two parallel subtrees, depth 4 from root.
//! - `h8_cross_tree`: same shape but depth 8 — exercises LCA worst-case.
//! - `h4_up`: up-transition (target is an ancestor of current).
//! - `h4_self`: self-transition (target == current).
//! - `h4_drop`: send an event with no matching handler (drop path).
//! - `h4_self_emit_chain`: action emits next event 3×; tests the dispatch drain loop.
//! - `h2_cold_start`: first dispatch into a freshly-constructed chart (priming step).
//!
//! Each bench's setup function primes the chart to a known state outside the
//! measured region. The body sends one event and runs `step()` once.
#[cfg(not(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy")))))]
fn main() {
// The benches use sync action impls; under `--features tokio` /
// `--features embassy` the codegen emits async fns and the impls
// would need an `async` keyword. Rather than maintain two parallel
// bench files, we gate the whole suite to the default-features /
// Linux configuration, which is what we measure latency in anyway.
eprintln!(
"hsmc dispatch benches require Linux + default features \
(gungraun + valgrind, sync action impls)."
);
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
use gungraun::{library_benchmark, library_benchmark_group, main};
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
use hsmc::{statechart, Duration};
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
use std::hint::black_box;
// ──────────────────────────────────────────────────────────────────────
// Chart 1: H=2 sibling. LCA(A, B) = P. Two states deep.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod h2 {
use super::*;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Go,
}
statechart! {
H2 {
context: Ctx;
events: Ev;
default(P);
state P {
default(A);
state A { on(Go) => B; }
state B { entry: noop; }
}
}
}
impl H2Actions for H2ActionContext<'_> {
fn noop(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Chart 2: H=4 cross-tree. LCA(L3, R3) = root. Stresses LCA over 8 ancestors.
// Also has up- and self-transition events for additional benches.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod h4 {
use super::*;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Cross,
Up,
Self_,
}
statechart! {
H4 {
context: Ctx;
events: Ev;
default(L1);
state L1 {
default(L2);
state L2 {
default(L3);
state L3 {
on(Cross) => R3;
on(Up) => L1;
on(Self_) => L3;
}
}
}
state R1 {
default(R2);
state R2 {
default(R3);
state R3 { entry: noop; }
}
}
}
}
impl H4Actions for H4ActionContext<'_> {
fn noop(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Chart 3: H=8 cross-tree. LCA(L7, R7) = root. Worst-case for the
// pre-fix O(H²) LCA — old code does ~64 compares; new code does ~16.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod h8 {
use super::*;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Cross,
}
statechart! {
H8 {
context: Ctx;
events: Ev;
default(L1);
state L1 { default(L2);
state L2 { default(L3);
state L3 { default(L4);
state L4 { default(L5);
state L5 { default(L6);
state L6 { default(L7);
state L7 { on(Cross) => R7; }
}
}
}
}
}
}
state R1 { default(R2);
state R2 { default(R3);
state R3 { default(R4);
state R4 { default(R5);
state R5 { default(R6);
state R6 { default(R7);
state R7 { entry: noop; }
}
}
}
}
}
}
}
}
impl H8Actions for H8ActionContext<'_> {
fn noop(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Chart 4: emit-chain. S0 →(Go)→ S1 →(emits Next)→ S2 →(emits Next)→ S3 →(emits Next)→ S4.
// One Send + one Step ⇒ chart drains 4 events through 3 self-emits.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod chain {
use super::*;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Go,
Next,
}
statechart! {
Chain {
context: Ctx;
events: Ev;
default(S0);
state S0 { on(Go) => S1; }
state S1 { entry: emit_next; on(Next) => S2; }
state S2 { entry: emit_next; on(Next) => S3; }
state S3 { entry: emit_next; on(Next) => S4; }
state S4 { entry: settle; }
}
}
impl ChainActions for ChainActionContext<'_> {
fn emit_next(&mut self) {
let _ = self.emit(Ev::Next);
}
fn settle(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Chart 5: handler bubbling. Active state is L4 (depth 5). The three
// events resolve to handlers at three different ancestor depths so the
// __PARENT walk in step() is exercised at increasing distance:
//
// Leaf — handler on L4 itself → bubble depth 0
// Mid — handler on L1 (3 ancestors) → bubble depth 3
// Top — handler on Outer (4 anc.) → bubble depth 4
//
// `Sibling` is the transition target so each event causes the same
// dispatch shape; the only thing that varies between benches is the
// bubble distance to the handler.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod bubble {
use super::*;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Leaf,
Mid,
Top,
}
statechart! {
Bubble {
context: Ctx;
events: Ev;
default(Outer);
state Outer {
default(L1);
on(Top) => Sibling;
state L1 {
default(L2);
on(Mid) => Sibling;
state L2 {
default(L3);
state L3 {
default(L4);
state L4 {
on(Leaf) => Sibling;
}
}
}
}
}
state Sibling { entry: noop; }
}
}
impl BubbleActions for BubbleActionContext<'_> {
fn noop(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Chart 6: timer firing. A single timer armed for 1 ns; the bench body
// advances time past expiry so `pop_expired` returns Some and dispatches
// the timer-driven transition. This is the only bench that exercises
// `step()`'s pop_expired non-empty branch — every other chart in this
// suite declares no `Duration` triggers and (post timer-elide pass) has
// the timer-table machinery removed at codegen.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod timer_fire {
use super::*;
#[derive(Default)]
pub struct Ctx;
statechart! {
TimerFire {
context: Ctx;
default(Armed);
state Armed {
on(after Duration::from_nanos(1)) => Fired;
}
state Fired { entry: noop; }
}
}
impl TimerFireActions for TimerFireActionContext<'_> {
fn noop(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Chart 7: terminate event. `Quit` is declared as the terminate event,
// so dispatching it runs `do_terminate()` — exits every active state up
// to the root, sets `terminated`, and short-circuits future `step()`s.
// Only bench that exercises `__check_terminate`'s true arm and the
// terminate-on-event path.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod term {
use super::*;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Quit,
}
statechart! {
Term {
context: Ctx;
events: Ev;
default(L1);
terminate(Quit);
state L1 {
default(L2);
state L2 {
default(L3);
state L3 { entry: noop; }
}
}
}
}
impl TermActions for TermActionContext<'_> {
fn noop(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Chart 8: bubble + cross-tree. Handler declared on L1 (4 ancestors up
// from current=L5) targets a deep leaf in a sibling subtree (R5). Two
// dispatch costs at once: the (now-O(1)) handler resolution and a
// 10-state-op cross-tree transition (5 exits + 5 enters). The
// realistic worst case for HSM dispatch — a parent's "back to default"
// handler that descends deep on the other side.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
mod bubble_cross {
use super::*;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Switch,
}
statechart! {
BubbleCross {
context: Ctx;
events: Ev;
default(L1);
state L1 {
default(L2);
on(Switch) => R5;
state L2 {
default(L3);
state L3 {
default(L4);
state L4 {
default(L5);
state L5 { entry: noop; }
}
}
}
}
state R1 {
default(R2);
state R2 {
default(R3);
state R3 {
default(R4);
state R4 {
default(R5);
state R5 { entry: noop; }
}
}
}
}
}
}
impl BubbleCrossActions for BubbleCrossActionContext<'_> {
fn noop(&mut self) {}
}
}
// ──────────────────────────────────────────────────────────────────────
// Setup helpers. Prime each chart to its measurement starting state
// OUTSIDE the measured region — gungraun only counts work inside
// the bench fn body.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_h2_warm() -> h2::H2<8> {
let mut m = h2::H2::new(h2::Ctx);
let _ = m.step(Duration::ZERO); // priming step → enters P → A
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_h2_cold() -> h2::H2<8> {
h2::H2::new(h2::Ctx)
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_h4_warm() -> h4::H4<8> {
let mut m = h4::H4::new(h4::Ctx);
let _ = m.step(Duration::ZERO); // priming step → L1 → L2 → L3
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_h8_warm() -> h8::H8<8> {
let mut m = h8::H8::new(h8::Ctx);
let _ = m.step(Duration::ZERO); // priming step → L1..L7
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_chain_warm() -> chain::Chain<8> {
let mut m = chain::Chain::new(chain::Ctx);
let _ = m.step(Duration::ZERO); // priming step → S0
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_bubble_warm() -> bubble::Bubble<8> {
let mut m = bubble::Bubble::new(bubble::Ctx);
let _ = m.step(Duration::ZERO); // priming step → Outer → L1 → L2 → L3 → L4
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_timer_fire_armed() -> timer_fire::TimerFire<8> {
let mut m = timer_fire::TimerFire::new(timer_fire::Ctx);
let _ = m.step(Duration::ZERO); // priming step → enters Armed, arms 1ns timer
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_term_warm() -> term::Term<8> {
let mut m = term::Term::new(term::Ctx);
let _ = m.step(Duration::ZERO); // priming step → L1 → L2 → L3
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
fn setup_bubble_cross_warm() -> bubble_cross::BubbleCross<8> {
let mut m = bubble_cross::BubbleCross::new(bubble_cross::Ctx);
let _ = m.step(Duration::ZERO); // priming step → L1 → L2 → L3 → L4 → L5
m
}
// ──────────────────────────────────────────────────────────────────────
// Benches. One library_benchmark per scenario. Each takes its primed
// chart by value, sends one event, and runs one step.
// ──────────────────────────────────────────────────────────────────────
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::cold(setup = setup_h2_cold)]
fn h2_cold_start(mut m: h2::H2<8>) -> h2::H2<8> {
// first .step() primes the chart by entering the default state path
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::warm(setup = setup_h2_warm)]
fn h2_warm_lateral(mut m: h2::H2<8>) -> h2::H2<8> {
let _ = black_box(m.send(black_box(h2::Ev::Go)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::cross(setup = setup_h4_warm)]
fn h4_cross_tree(mut m: h4::H4<8>) -> h4::H4<8> {
let _ = black_box(m.send(black_box(h4::Ev::Cross)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::up(setup = setup_h4_warm)]
fn h4_up(mut m: h4::H4<8>) -> h4::H4<8> {
let _ = black_box(m.send(black_box(h4::Ev::Up)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::self_(setup = setup_h4_warm)]
fn h4_self(mut m: h4::H4<8>) -> h4::H4<8> {
let _ = black_box(m.send(black_box(h4::Ev::Self_)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::cross(setup = setup_h8_warm)]
fn h8_cross_tree(mut m: h8::H8<8>) -> h8::H8<8> {
let _ = black_box(m.send(black_box(h8::Ev::Cross)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::leaf(setup = setup_bubble_warm)]
fn bubble_leaf(mut m: bubble::Bubble<8>) -> bubble::Bubble<8> {
// Handler on L4 (current state). Bubble distance = 0.
let _ = black_box(m.send(black_box(bubble::Ev::Leaf)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::mid(setup = setup_bubble_warm)]
fn bubble_mid(mut m: bubble::Bubble<8>) -> bubble::Bubble<8> {
// Handler on L1. Bubble walks L4 → L3 → L2 → L1 (3 __PARENT hops).
let _ = black_box(m.send(black_box(bubble::Ev::Mid)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::top(setup = setup_bubble_warm)]
fn bubble_top(mut m: bubble::Bubble<8>) -> bubble::Bubble<8> {
// Handler on Outer. Bubble walks L4 → L3 → L2 → L1 → Outer (4 hops).
let _ = black_box(m.send(black_box(bubble::Ev::Top)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::fire(setup = setup_timer_fire_armed)]
fn timer_fire_dispatch(mut m: timer_fire::TimerFire<8>) -> timer_fire::TimerFire<8> {
// Advance time by 2ns — past the 1ns arm — so pop_expired returns
// Some and dispatches the timer-driven Armed → Fired transition.
let _ = black_box(m.step(black_box(Duration::from_nanos(2))));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::quit(setup = setup_term_warm)]
fn terminate_event(mut m: term::Term<8>) -> term::Term<8> {
// Send Quit (declared as terminate event); step runs check_terminate's
// true arm and do_terminate, which exits L3 → L2 → L1 → root.
let _ = black_box(m.send(black_box(term::Ev::Quit)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::switch(setup = setup_bubble_cross_warm)]
fn bubble_cross_tree(mut m: bubble_cross::BubbleCross<8>) -> bubble_cross::BubbleCross<8> {
// Switch handler is on L1 (4 bubble hops from current=L5). Target is
// R5 in a sibling subtree, so the transition is exit L5..L1 + enter
// R1..R5 = 10 state operations.
let _ = black_box(m.send(black_box(bubble_cross::Ev::Switch)));
let _ = black_box(m.step(black_box(Duration::ZERO)));
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
#[library_benchmark]
#[bench::chain(setup = setup_chain_warm)]
fn chain_self_emit(mut m: chain::Chain<8>) -> chain::Chain<8> {
let _ = black_box(m.send(black_box(chain::Ev::Go)));
// Drain the chain: 1 step per event. Go → S1 (entry emits Next) → S2
// (entry emits Next) → S3 (entry emits Next) → S4. 4 events total.
for _ in 0..4 {
let _ = black_box(m.step(black_box(Duration::ZERO)));
}
m
}
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
library_benchmark_group!(
name = dispatch;
benchmarks =
h2_cold_start,
h2_warm_lateral,
h4_cross_tree,
h4_up,
h4_self,
h8_cross_tree,
bubble_leaf,
bubble_mid,
bubble_top,
timer_fire_dispatch,
terminate_event,
bubble_cross_tree,
chain_self_emit,
);
#[cfg(all(target_os = "linux", not(any(feature = "tokio", feature = "embassy"))))]
main!(library_benchmark_groups = dispatch);
hsmc/examples/microwave_tui.rs
-761
View File
@@ -1,761 +0,0 @@
//! Interactive microwave oven TUI driven by `hsmc`.
//!
//! Run it:
//!
//! ```text
//! cargo run --example microwave_tui --features tokio
//! ```
//!
//! Keys:
//! S — Start cook O — Open door
//! X — Stop / cancel C — Close door
//! K — Simulate power failure (terminates the machine)
//! Q — Quit
//!
//! This demonstrates the same statechart as `microwave.rs` but hooked up to
//! live keyboard input and a real-time ratatui UI. The state machine runs
//! on `oven.run()` in one task; a second task reads keys and forwards them
//! via a cloned `sender()`; a third task redraws the screen 30×/sec using
//! state published by entry/exit actions.
use std::{
collections::VecDeque,
io,
sync::{Arc, Mutex},
time::Instant,
};
use crossterm::{
event::{DisableMouseCapture, EnableMouseCapture, Event, EventStream, KeyCode, KeyEventKind},
execute,
terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use futures::StreamExt;
use hsmc::{statechart, Duration};
use ratatui::{
backend::CrosstermBackend,
layout::{Constraint, Direction, Layout, Rect},
style::{Color, Modifier, Style, Stylize},
text::{Line, Span},
widgets::{Block, Borders, Gauge, Paragraph, Wrap},
Terminal,
};
// ---------- Shared UI state ----------
//
// The actions write into this through the user context. The render task
// reads it. `Arc<Mutex<_>>` keeps it cheap and thread-safe.
#[derive(Default)]
pub struct UiState {
state_path: Vec<&'static str>,
display: String,
magnetron: bool,
heater: bool,
door_open: bool,
blink: bool,
log: VecDeque<String>,
/// Instant at which the cook should complete. Advances by the pause
/// duration on resume so the progress bar freezes while paused.
cook_deadline: Option<Instant>,
cook_total: Duration,
/// Set when we enter Paused; cleared on resume. Freezes the gauge.
paused_at: Option<Instant>,
terminated: bool,
}
impl UiState {
async fn log(&mut self, msg: impl Into<String>) {
self.log.push_back(msg.into());
while self.log.len() > 50 {
self.log.pop_front();
}
}
async fn set_path(&mut self, path: &[&'static str]) {
self.state_path = path.to_vec();
}
}
// ---------- User context ----------
pub struct OvenContext {
pub ui: Arc<Mutex<UiState>>,
}
// ---------- Events ----------
#[derive(Debug, Clone)]
pub enum OvenEvent {
StartPressed,
StopPressed,
DoorOpened,
DoorClosed,
Reset,
/// Sent by the external watchdog when the adjusted cook deadline is met.
/// Using an event instead of a static `Duration` transition lets us pause
/// and resume the cook clock — something hsmc timers can't do on their own.
CookDone,
PowerFailure,
}
// ---------- Statechart ----------
//
// Same shape as microwave.rs (every feature exercised) with a longer cook
// time so the user has time to interact. The cook timer lives on `Running`
// so it survives Heating⇄Paused transitions.
const COOK_MS: u64 = 8_000;
statechart! {
Oven {
context: OvenContext;
events: OvenEvent;
entry: boot_self_test;
entry: log_boot_done;
exit: save_last_state;
exit: cut_all_power;
default(Idle);
terminate(PowerFailure);
// Root-level door tracking. Any state whose local handler shadows these
// must repeat `mark_door_*` alongside its own handlers.
on(DoorOpened) => mark_door_open;
on(DoorClosed) => mark_door_closed;
// Idle is split so Start can only fire when the door is closed. This is
// the HSM equivalent of a guard — a structural check rather than a
// boolean predicate.
state Idle {
// `sync_door` runs after the default descent completes handling, then
// emits DoorOpened if the door is physically open. That re-aligns the
// machine with reality when we land in Idle from Running (e.g. Stop
// pressed while door is open). The emitted event is processed after
// the entry cascade, so DoorClosed → DoorOpen happens cleanly.
entry: enter_idle, sync_door;
default(DoorClosed);
state DoorClosed {
entry: show_ready;
// Local handlers, so we must repeat mark_door_open here.
on(DoorOpened) => mark_door_open;
on(DoorOpened) => DoorOpen;
on(StartPressed) => record_start;
on(StartPressed) => prime_cook;
on(StartPressed) => Running;
}
state DoorOpen {
entry: show_close_door;
on(DoorClosed) => mark_door_closed;
on(DoorClosed) => DoorClosed;
// Pressing Start while door is open: beep + log, no transition.
on(StartPressed) => warn_door_open;
}
}
state Running {
entry: enter_running, start_cook_clock;
exit: stop_cook_clock;
default(Cooking);
on(after Duration::from_millis(250)) => heartbeat;
on(StopPressed) => Idle;
on(CookDone) => Done;
state Cooking {
entry: enter_cooking, show_cooking;
default(Heating);
state Heating {
// Magnetron + heater live on Heating so they turn off the
// instant we leave for Paused.
entry: enter_heating, start_magnetron, heater_on;
exit: heater_off, stop_magnetron;
on(DoorOpened) => mark_door_open;
on(DoorOpened) => pause_cook_clock;
on(DoorOpened) => Suspended;
}
// Suspended = "cook is paused". Two substates express the classic
// microwave rule: closing the door alone does NOT resume cooking
// — the user must press Start. Pressing Stop (handled by Running)
// cancels entirely back to Idle.
state Suspended {
entry: enter_suspended, start_pause_blink;
exit: stop_pause_blink;
default(DoorAjar);
state DoorAjar {
entry: show_paused;
on(DoorClosed) => mark_door_closed;
on(DoorClosed) => AwaitingResume;
}
state AwaitingResume {
entry: show_press_start;
on(DoorOpened) => mark_door_open;
on(DoorOpened) => DoorAjar;
// Actions fire before the transition, so the clock is
// resumed and the log line written before we re-enter
// Heating (which turns the magnetron back on).
on(StartPressed) => log_resume;
on(StartPressed) => resume_cook_clock;
on(StartPressed) => Heating;
}
}
}
}
state Done {
entry: enter_done, beep, show_done;
exit: exit_done;
on(after Duration::from_millis(2000)) => schedule_auto_reset;
on(StartPressed) => Done;
on(Reset) => Idle;
}
}
}
// ---------- Actions ----------
//
// Every method is either publishing to the shared UI state or emitting an
// event back into the machine.
impl OvenActions for OvenActionContext<'_> {
// Root
async fn boot_self_test(&mut self) { self.ui.lock().unwrap().log("BOOT self-test ok"); }
async fn log_boot_done(&mut self) { self.ui.lock().unwrap().log("BOOT ready"); }
async fn save_last_state(&mut self){ self.ui.lock().unwrap().log("SHUTDOWN persisted state"); }
async fn cut_all_power(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.magnetron = false;
ui.heater = false;
ui.display = "-- OFF --".into();
ui.terminated = true;
ui.log("SHUTDOWN power cut");
}
// Door tracking (root-level)
async fn mark_door_open(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.door_open = true;
}
async fn mark_door_closed(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.door_open = false;
}
// Idle
async fn enter_idle(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Idle"]);
}
async fn sync_door(&mut self) {
let door_open = self.ui.lock().unwrap().door_open;
if door_open {
self.ui.lock().unwrap().log("IDLE door still open — syncing");
let _ = self.emit(OvenEvent::DoorOpened);
}
}
async fn show_ready(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Idle", "DoorClosed"]);
ui.display = "READY".into();
ui.log("IDLE ready");
}
async fn show_close_door(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Idle", "DoorOpen"]);
ui.display = "CLOSE DOOR".into();
ui.log("IDLE door is open");
}
async fn warn_door_open(&mut self) {
self.ui.lock().unwrap().log("WARN can't start — door open");
}
async fn record_start(&mut self) { self.ui.lock().unwrap().log("BTN start pressed"); }
async fn prime_cook(&mut self) { self.ui.lock().unwrap().log("BTN primed cook"); }
async fn beep(&mut self) { self.ui.lock().unwrap().log("*BEEP*"); }
// Running
async fn enter_running(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Running"]);
}
async fn start_magnetron(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.magnetron = true;
ui.log("MAG on");
}
async fn stop_magnetron(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.magnetron = false;
ui.log("MAG off");
}
async fn start_cook_clock(&mut self) {
let mut ui = self.ui.lock().unwrap();
let total = Duration::from_millis(COOK_MS);
ui.cook_total = total;
ui.cook_deadline = Some(Instant::now() + total);
ui.paused_at = None;
}
async fn stop_cook_clock(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.cook_deadline = None;
ui.paused_at = None;
}
async fn pause_cook_clock(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.paused_at = Some(Instant::now());
ui.log("CLOCK paused");
}
async fn resume_cook_clock(&mut self) {
let mut ui = self.ui.lock().unwrap();
if let (Some(paused_at), Some(deadline)) = (ui.paused_at, ui.cook_deadline) {
let skipped = paused_at.elapsed();
ui.cook_deadline = Some(deadline + skipped);
ui.log(format!("CLOCK resume (+{}ms)", skipped.as_millis()));
}
ui.paused_at = None;
}
async fn heartbeat(&mut self) { /* UI gauge animates on its own */ }
// Cooking / Heating
async fn enter_cooking(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Running", "Cooking"]);
}
async fn show_cooking(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.display = "COOKING".into();
ui.blink = false;
}
async fn enter_heating(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Running", "Cooking", "Heating"]);
ui.blink = false;
ui.display = "COOKING".into();
}
async fn heater_on(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.heater = true;
ui.log("HEAT on");
}
async fn heater_off(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.heater = false;
ui.log("HEAT off");
}
// Suspended (paused)
async fn enter_suspended(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Running", "Cooking", "Suspended"]);
}
async fn show_paused(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Running", "Cooking", "Suspended", "DoorAjar"]);
ui.display = "PAUSED".into();
}
async fn show_press_start(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Running", "Cooking", "Suspended", "AwaitingResume"]);
ui.display = "PRESS START".into();
ui.log("PAUSE door closed — press Start to resume");
}
async fn start_pause_blink(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.blink = true;
ui.log("PAUSE blink on");
}
async fn stop_pause_blink(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.blink = false;
ui.log("PAUSE blink off");
}
async fn log_resume(&mut self) { self.ui.lock().unwrap().log("PAUSE resuming"); }
// Done
async fn enter_done(&mut self) {
let mut ui = self.ui.lock().unwrap();
ui.set_path(&["Oven", "Done"]);
}
async fn show_done(&mut self) {
self.ui.lock().unwrap().display = "DONE!".into();
}
async fn exit_done(&mut self) { self.ui.lock().unwrap().log("DONE exit"); }
async fn schedule_auto_reset(&mut self) {
self.ui.lock().unwrap().log("DONE auto-reset queued");
self.emit(OvenEvent::Reset).expect("queue has room");
}
}
// ---------- Rendering ----------
fn draw(frame: &mut ratatui::Frame<'_>, ui: &UiState) {
let size = frame.area();
let root = Layout::default()
.direction(Direction::Vertical)
.constraints([
Constraint::Length(1),
Constraint::Min(16),
Constraint::Length(10),
Constraint::Length(3),
])
.split(size);
// --- Title bar ---
let title = if ui.terminated {
Line::from(vec![
Span::styled(" MICROWAVE ", Style::new().bg(Color::Red).fg(Color::White).bold()),
Span::raw(" "),
Span::styled("TERMINATED", Style::new().fg(Color::Red).bold()),
])
} else {
Line::from(vec![
Span::styled(" MICROWAVE ", Style::new().bg(Color::Yellow).fg(Color::Black).bold()),
Span::raw(" hsmc statechart demo · press Q to quit"),
])
};
frame.render_widget(Paragraph::new(title), root[0]);
// --- Main area: oven on the left, status on the right ---
let main = Layout::default()
.direction(Direction::Horizontal)
.constraints([Constraint::Percentage(55), Constraint::Percentage(45)])
.split(root[1]);
draw_oven(frame, main[0], ui);
draw_status(frame, main[1], ui);
// --- Log ---
let log_lines: Vec<Line> = ui.log.iter().rev().take(8).rev()
.map(|s| Line::from(s.as_str()))
.collect();
let log = Paragraph::new(log_lines)
.block(Block::default().title(" Event log ").borders(Borders::ALL))
.wrap(Wrap { trim: false });
frame.render_widget(log, root[2]);
// --- Keys ---
let keys = Line::from(vec![
key_hint("S", "Start"),
Span::raw(" "),
key_hint("X", "Stop"),
Span::raw(" "),
key_hint("O", "Open door"),
Span::raw(" "),
key_hint("C", "Close door"),
Span::raw(" "),
key_hint("K", "Kill (power fail)"),
Span::raw(" "),
key_hint("Q", "Quit"),
]);
frame.render_widget(
Paragraph::new(keys).block(Block::default().borders(Borders::ALL).title(" Controls ")),
root[3],
);
}
fn key_hint(k: &str, label: &str) -> Span<'static> {
Span::from(format!("[{}] {}", k, label)).fg(Color::Cyan)
}
fn draw_oven(frame: &mut ratatui::Frame<'_>, area: Rect, ui: &UiState) {
let block = Block::default().borders(Borders::ALL).title(" Oven ");
let inner = block.inner(area);
frame.render_widget(block, area);
let rows = Layout::default()
.direction(Direction::Vertical)
.constraints([
Constraint::Length(1),
Constraint::Length(5),
Constraint::Length(1),
Constraint::Length(1),
Constraint::Length(2),
Constraint::Min(0),
])
.split(inner);
// Door indicator line
let door_line = if ui.door_open {
Span::styled(" ┌───── DOOR OPEN ─────┐", Style::new().fg(Color::Yellow).bold())
} else {
Span::styled(" ┌───── door closed ─────┐", Style::new().fg(Color::DarkGray))
};
frame.render_widget(Paragraph::new(Line::from(door_line)), rows[0]);
// Big display
let display_style = if ui.terminated {
Style::new().fg(Color::Red).bold()
} else if ui.blink && (Instant::now().elapsed().as_millis() / 300) % 2 == 0 {
Style::new().fg(Color::Yellow).bold()
} else if ui.display == "DONE!" {
Style::new().fg(Color::Green).bold()
} else if ui.display == "COOKING" {
Style::new().fg(Color::LightRed).bold()
} else {
Style::new().fg(Color::Cyan).bold()
};
let big = Paragraph::new(vec![
Line::from(""),
Line::from(Span::styled(
format!(" ┃ {:^14} ┃", ui.display),
display_style,
)),
Line::from(Span::styled(" ┃ ┃", Style::new().fg(Color::DarkGray))),
Line::from(Span::styled(" ┗━━━━━━━━━━━━━━━━━━┛", Style::new().fg(Color::DarkGray))),
]);
frame.render_widget(big, rows[1]);
// Progress gauge for cook — freezes while paused.
let (ratio, label, color) = if let Some(deadline) = ui.cook_deadline {
let now = ui.paused_at.unwrap_or_else(Instant::now);
let total = ui.cook_total;
let remaining = deadline.saturating_duration_since(now);
let elapsed = total.saturating_sub(remaining);
let r = (elapsed.as_secs_f64() / total.as_secs_f64()).clamp(0.0, 1.0);
let label = format!("{:.1}s / {:.1}s{}",
elapsed.as_secs_f64(),
total.as_secs_f64(),
if ui.paused_at.is_some() { " (paused)" } else { "" },
);
let color = if ui.paused_at.is_some() { Color::Yellow } else { Color::LightRed };
(r, label, color)
} else {
(0.0, "—".to_string(), Color::DarkGray)
};
let gauge = Gauge::default()
.block(Block::default().borders(Borders::NONE))
.gauge_style(Style::new().fg(color))
.ratio(ratio)
.label(label);
frame.render_widget(gauge, rows[3]);
}
fn draw_status(frame: &mut ratatui::Frame<'_>, area: Rect, ui: &UiState) {
let block = Block::default().borders(Borders::ALL).title(" Status ");
let inner = block.inner(area);
frame.render_widget(block, area);
let path = if ui.state_path.is_empty() {
"—".to_string()
} else {
ui.state_path.join(" › ")
};
let bullet = |on: bool| {
if on { Span::styled("●", Style::new().fg(Color::Green).bold()) }
else { Span::styled("○", Style::new().fg(Color::DarkGray)) }
};
let lines = vec![
Line::from(""),
Line::from(vec![
Span::styled(" State path: ", Style::new().fg(Color::DarkGray)),
Span::styled(path, Style::new().fg(Color::White).bold()),
]),
Line::from(""),
Line::from(vec![
Span::raw(" Magnetron "),
bullet(ui.magnetron),
Span::raw(if ui.magnetron { " ON " } else { " off" }),
]),
Line::from(vec![
Span::raw(" Heater "),
bullet(ui.heater),
Span::raw(if ui.heater { " ON " } else { " off" }),
]),
Line::from(vec![
Span::raw(" Door "),
if ui.door_open {
Span::styled("OPEN ", Style::new().fg(Color::Yellow).add_modifier(Modifier::BOLD))
} else {
Span::styled("CLOSED", Style::new().fg(Color::DarkGray))
},
]),
Line::from(""),
Line::from(vec![
Span::styled(" hsmc tip: ", Style::new().fg(Color::DarkGray)),
Span::raw("events bubble · timers don't"),
]),
];
frame.render_widget(Paragraph::new(lines), inner);
}
// ---------- Main ----------
#[tokio::main(flavor = "current_thread")]
async fn main() -> io::Result<()> {
// Shared UI state.
let ui = Arc::new(Mutex::new(UiState::default()));
// Build the machine.
let ctx = OvenContext { ui: Arc::clone(&ui) };
let mut oven = Oven::with_queue_capacity::<16>(ctx);
let sender = oven.sender();
let fault_sender = oven.sender();
let cook_sender = oven.sender();
// Raw-mode terminal.
enable_raw_mode()?;
let mut stdout = io::stdout();
execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
let backend = CrosstermBackend::new(stdout);
let mut terminal = Terminal::new(backend)?;
// Render loop — 30 fps.
let ui_for_render = Arc::clone(&ui);
let (render_stop_tx, mut render_stop_rx) = tokio::sync::oneshot::channel::<()>();
let render_task = tokio::spawn(async move {
let mut interval = tokio::time::interval(Duration::from_millis(33));
loop {
tokio::select! {
_ = &mut render_stop_rx => break,
_ = interval.tick() => {
let snapshot = {
let g = ui_for_render.lock().unwrap();
UiSnapshot::from(&*g)
};
let _ = terminal.draw(|f| draw(f, &snapshot.into()));
}
}
}
// Restore terminal.
let _ = disable_raw_mode();
let _ = execute!(terminal.backend_mut(), LeaveAlternateScreen, DisableMouseCapture);
terminal
});
// Cook-clock watchdog. Polls shared UI state; when we're not paused and
// the deadline has passed, fires a single CookDone event and then sleeps
// until the deadline is re-armed. The machine discards CookDone if the
// current state doesn't handle it (e.g. after StopPressed).
let ui_for_watchdog = Arc::clone(&ui);
let watchdog_task = tokio::spawn(async move {
loop {
tokio::time::sleep(Duration::from_millis(50)).await;
let should_fire = {
let u = ui_for_watchdog.lock().unwrap();
if u.terminated { return; }
match (u.cook_deadline, u.paused_at) {
(Some(deadline), None) => Instant::now() >= deadline,
_ => false,
}
};
if should_fire {
let _ = cook_sender.send(OvenEvent::CookDone);
// Give the machine a beat to process and clear cook_deadline
// (via Running's exit → stop_cook_clock) before we check again.
tokio::time::sleep(Duration::from_millis(100)).await;
}
}
});
// Input loop.
let ui_for_input = Arc::clone(&ui);
let input_task = tokio::spawn(async move {
let mut events = EventStream::new();
while let Some(Ok(ev)) = events.next().await {
if let Event::Key(k) = ev {
if k.kind != KeyEventKind::Press { continue; }
let code = k.code;
let msg = match code {
KeyCode::Char('s') | KeyCode::Char('S') => Some(OvenEvent::StartPressed),
KeyCode::Char('x') | KeyCode::Char('X') => Some(OvenEvent::StopPressed),
KeyCode::Char('o') | KeyCode::Char('O') => Some(OvenEvent::DoorOpened),
KeyCode::Char('c') | KeyCode::Char('C') => Some(OvenEvent::DoorClosed),
KeyCode::Char('k') | KeyCode::Char('K') => Some(OvenEvent::PowerFailure),
KeyCode::Char('q') | KeyCode::Char('Q') | KeyCode::Esc => {
// Quit: cleanly terminate the machine via PowerFailure.
let _ = fault_sender.send(OvenEvent::PowerFailure);
break;
}
_ => None,
};
if let Some(m) = msg {
ui_for_input.lock().unwrap().log(format!("KEY -> {:?}", m));
let _ = sender.send(m);
}
}
}
});
// Drive the state machine on the main task.
let _ = oven.run().await;
// Let the UI show the TERMINATED banner briefly.
tokio::time::sleep(Duration::from_millis(700)).await;
// Stop the render loop.
let _ = render_stop_tx.send(());
input_task.abort();
watchdog_task.abort();
let mut terminal = render_task.await.expect("render task");
// Belt-and-braces teardown in case the render loop didn't get to it.
let _ = disable_raw_mode();
let _ = execute!(terminal.backend_mut(), LeaveAlternateScreen, DisableMouseCapture);
// Final transcript.
let ui = ui.lock().unwrap();
println!("\nFinal state: {}", ui.state_path.join(" › "));
println!("Events: {}", ui.log.len());
for line in ui.log.iter() {
println!(" {}", line);
}
Ok(())
}
// Snapshot so we don't hold the Mutex across the render.
struct UiSnapshot {
state_path: Vec<&'static str>,
display: String,
magnetron: bool,
heater: bool,
door_open: bool,
blink: bool,
log: VecDeque<String>,
cook_deadline: Option<Instant>,
cook_total: Duration,
paused_at: Option<Instant>,
terminated: bool,
}
impl From<&UiState> for UiSnapshot {
fn from(u: &UiState) -> Self {
Self {
state_path: u.state_path.clone(),
display: u.display.clone(),
magnetron: u.magnetron,
heater: u.heater,
door_open: u.door_open,
blink: u.blink,
log: u.log.clone(),
cook_deadline: u.cook_deadline,
cook_total: u.cook_total,
paused_at: u.paused_at,
terminated: u.terminated,
}
}
}
impl From<UiSnapshot> for UiState {
fn from(s: UiSnapshot) -> Self {
Self {
state_path: s.state_path,
display: s.display,
magnetron: s.magnetron,
heater: s.heater,
door_open: s.door_open,
blink: s.blink,
log: s.log,
cook_deadline: s.cook_deadline,
cook_total: s.cook_total,
paused_at: s.paused_at,
terminated: s.terminated,
}
}
}
hsmc/src/error.rs
+17
View File
@@ -18,3 +18,20 @@ impl core::fmt::Display for HsmcError {
#[cfg(feature = "tokio")]
impl std::error::Error for HsmcError {}
#[cfg(test)]
mod tests {
use super::*;
extern crate alloc;
use alloc::format;
// Kills: <impl Display for HsmcError>::fmt -> Ok(Default::default())
#[test]
fn display_messages_are_specific() {
assert_eq!(format!("{}", HsmcError::QueueFull), "event queue is full");
assert_eq!(
format!("{}", HsmcError::AlreadyTerminated),
"machine has already terminated"
);
}
}
hsmc/src/journal.rs
+158
View File
@@ -0,0 +1,158 @@
//! Deterministic execution journal for `hsmc` charts.
//!
//! Behind `feature = "journal"`. The macro emits one [`TraceEvent`] for every
//! observable atom in chart execution: entries, exits, action invocations,
//! during start/cancel, timer arm/cancel/fire, queued emits, event delivery,
//! transitions, and termination.
//!
//! For a fixed `(chart, initial context, external event sequence,
//! elapsed-time inputs)`, the produced journal is byte-identical across runs
//! — that's the contract the verification harness checks against.
//!
//! All identifiers in the journal are stable u16 indices generated at macro
//! expansion time. Each chart also exposes:
//!
//! - `<Chart>::CHART_HASH: u64` — identifies the chart definition; mismatch
//! on replay = different chart.
//! - `<Chart>::state_name(id)`, `<Chart>::action_name(id)`,
//! `<Chart>::event_name(id)`, `<Chart>::timer_label(id)` — human-readable
//! names for debugging.
//!
//! The journal does not record `during:` race outcomes from `run()` — race
//! winners depend on wall-clock timing and are not part of the deterministic
//! contract (see semantics doc). What you see in the journal is the *result*
//! of any race: the event the winning during emitted.
extern crate alloc;
pub(crate) use alloc::vec::Vec;
/// Owned journal returned by `take_journal()`. A `Vec<TraceEvent>` whose
/// concrete crate (`alloc::vec::Vec`) is hidden so callers don't need an
/// `extern crate alloc` of their own.
pub type Journal = alloc::vec::Vec<TraceEvent>;
/// Distinguishes which kind of slot an action was invoked in. Pure metadata
/// — the action body is the same regardless. Lets the journal be readable
/// without cross-referencing surrounding events.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum ActionKind {
/// Entry action of a state.
Entry,
/// Exit action of a state.
Exit,
/// Handler action (action attached to a transition or standalone
/// `action(...) => fn`).
Handler,
}
/// Why a transition fired. Carried on `TransitionFired` so observers can
/// see *what triggered* the state change, not just that one happened.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum TransitionReason {
/// External or queued event with the given index dispatched into a
/// handler that fired this transition.
Event { event: u16 },
/// Timer on the given (state, timer) slot expired and its handler
/// fired this transition.
Timer { state: u16, timer: u16 },
/// Driven from inside the runtime without an originating event or
/// timer. Emitted for `default(...)` firings: after a state with a
/// declared default is entered, the default fires as a transition
/// with this reason. The default target may be any state in the
/// chart — sibling, ancestor, anywhere.
Internal,
}
/// One observable atom of chart execution. The macro emits these at every
/// hook point so the full sequence can be journaled and compared.
///
/// Variants carry stable u16 indices, never strings. Serialization (binary
/// or JSON) of these values is reproducible across rebuilds.
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum TraceEvent {
/// First event in any journal. Identifies the chart definition.
Started { chart_hash: u64 },
/// A state's entry began. The marker is emitted before any of the
/// state's entry actions, timers, or durings have run. Followed by
/// `ActionInvoked{Entry}`, `TimerArmed`, `DuringStarted`, then the
/// matching `Entered` end marker.
EnterBegan { state: u16 },
/// A state's entry completed. Emitted after every entry action,
/// timer arm, and during start has run for that state. Pairs with
/// the prior `EnterBegan { state }`.
Entered { state: u16 },
/// A state's exit began. The marker is emitted before any of the
/// state's during cancellations, timer cancellations, or exit
/// actions have run. Followed by `DuringCancelled`, `TimerCancelled`,
/// `ActionInvoked{Exit}`, then the matching `Exited` end marker.
ExitBegan { state: u16 },
/// A state's exit completed. Emitted after every during cancel,
/// timer cancel, and exit action has run for that state. Pairs with
/// the prior `ExitBegan { state }`.
Exited { state: u16 },
/// An action function was called.
ActionInvoked {
state: u16,
action: u16,
kind: ActionKind,
},
/// A `during:` activity became logically active for its owning state.
/// Index is the state-local declaration order (0-based).
DuringStarted { state: u16, during: u16 },
/// A `during:` activity was cancelled because its owning state is
/// being exited.
DuringCancelled { state: u16, during: u16 },
/// A transition is about to fire. `from` is the innermost active
/// state at the moment the transition was triggered; `to` is the
/// target; `reason` records what caused the transition (event,
/// timer, or internal). Followed by the actual `ExitBegan`/`Exited`/
/// `EnterBegan`/`Entered` events that implement the transition,
/// then the matching `TransitionComplete` end marker.
TransitionFired {
from: Option<u16>,
to: u16,
reason: TransitionReason,
},
/// A transition completed. Emitted after the transition's exit and
/// entry sequences are fully done. Pairs with the prior
/// `TransitionFired { from, to, .. }`.
TransitionComplete { from: Option<u16>, to: u16 },
/// An event was popped from the internal queue and is about to be
/// dispatched. Emitted before the handler search; followed by either
/// `EventDelivered` (handler found and ran) or `EventDropped`
/// (no handler on the active path), or `TerminateRequested` if the
/// event matches the chart's terminate declaration.
EventReceived { event: u16 },
/// An event reached a state's handler. `handler_state` is the state
/// whose handler ran (which may be an ancestor of the innermost
/// active state if the event bubbled).
EventDelivered { handler_state: u16, event: u16 },
/// An event was dispatched but no state on the active path had a
/// handler. Silently dropped per spec.
EventDropped { event: u16 },
/// `emit()` from inside an action successfully pushed an event onto
/// the internal queue.
EmitQueued { event: u16 },
/// `emit()` from inside an action failed because the queue was full.
/// The action chain continues; the runtime surfaces `QueueFull` at
/// end of tick.
EmitFailed { event: u16 },
/// An event matched the chart's `terminate(...)` declaration and is
/// about to drive shutdown. Followed by the bottom-up exit chain
/// (Exited events) and a final `Terminated`.
TerminateRequested { event: u16 },
/// A timer was armed (set to start counting down) for a state.
/// `ns` is the duration in nanoseconds.
TimerArmed { state: u16, timer: u16, ns: u64 },
/// A timer was cancelled because its owning state is being exited.
TimerCancelled { state: u16, timer: u16 },
/// A timer's countdown reached zero and its handler is about to run.
TimerFired { state: u16, timer: u16 },
/// The chart processed its `terminate` event and the run loop is
/// done. Always the final event in the journal.
Terminated,
}
// JournalSink lives in `__private` (in `lib.rs`) so the codegen can
// unconditionally refer to `::hsmc::__private::JournalSink` whether or
// not the `journal` feature is on.
hsmc/src/lib.rs
+1004 -8
View File
File diff suppressed because it is too large. Load diff
hsmc/tests/behavior.rs
+138 -5
View File
@@ -717,17 +717,150 @@ mod t2_8 {
#[test]
fn t2_8_transition_to_ancestor() {
// §2.6: up-transition. Target A is already active; we unwind only
// the subtree strictly below A. A itself is not exited or
// re-entered, and its default(B) does not re-fire.
let mut m = T28::new(TestCtx::default());
m.step(Duration::ZERO);
assert_eq!(m.context().logs(), ["a_entry", "b_entry"]);
m.context_mut().log.clear();
m.send(Ev::Up).unwrap();
m.step(Duration::ZERO);
assert_eq!(m.current_state(), T28State::B);
assert_eq!(
m.context().logs(),
["b_exit", "a_exit", "a_entry", "b_entry"]
);
assert_eq!(m.current_state(), T28State::A);
assert_eq!(m.context().logs(), ["b_exit"]);
}
}
// ---- T2.8b: up-transition across multiple levels ----
mod t2_8b {
use super::*;
#[derive(Debug, Clone)]
pub enum Ev {
Up,
}
statechart! {
T28b {
context: TestCtx;
events: Ev;
default(A);
state A {
default(B);
entry: a_entry;
exit: a_exit;
state B {
default(C);
entry: b_entry;
exit: b_exit;
state C {
entry: c_entry;
exit: c_exit;
on(Up) => A;
}
}
}
}
}
impl T28bActions for T28bActionContext<'_> {
fn a_entry(&mut self) {
self.log.push("a_entry".into());
}
fn a_exit(&mut self) {
self.log.push("a_exit".into());
}
fn b_entry(&mut self) {
self.log.push("b_entry".into());
}
fn b_exit(&mut self) {
self.log.push("b_exit".into());
}
fn c_entry(&mut self) {
self.log.push("c_entry".into());
}
fn c_exit(&mut self) {
self.log.push("c_exit".into());
}
}
#[test]
fn t2_8b_up_transition_across_levels() {
let mut m = T28b::new(TestCtx::default());
m.step(Duration::ZERO);
assert_eq!(m.context().logs(), ["a_entry", "b_entry", "c_entry"]);
m.context_mut().log.clear();
m.send(Ev::Up).unwrap();
m.step(Duration::ZERO);
assert_eq!(m.current_state(), T28bState::A);
assert_eq!(m.context().logs(), ["c_exit", "b_exit"]);
}
}
// ---- T2.8c: handler on ancestor, target is a mid-ancestor ----
mod t2_8c {
use super::*;
#[derive(Debug, Clone)]
pub enum Ev {
Up,
}
statechart! {
T28c {
context: TestCtx;
events: Ev;
default(A);
state A {
default(B);
entry: a_entry;
exit: a_exit;
on(Up) => B; // handler on A, target B
state B {
default(C);
entry: b_entry;
exit: b_exit;
state C {
entry: c_entry;
exit: c_exit;
}
}
}
}
}
impl T28cActions for T28cActionContext<'_> {
fn a_entry(&mut self) {
self.log.push("a_entry".into());
}
fn a_exit(&mut self) {
self.log.push("a_exit".into());
}
fn b_entry(&mut self) {
self.log.push("b_entry".into());
}
fn b_exit(&mut self) {
self.log.push("b_exit".into());
}
fn c_entry(&mut self) {
self.log.push("c_entry".into());
}
fn c_exit(&mut self) {
self.log.push("c_exit".into());
}
}
#[test]
fn t2_8c_up_transition_classified_by_innermost_not_handler() {
// Handler bubbles from C to A. Target B is on the active path and
// is not the innermost, so this is an up-transition — even though
// the handler was found on A (not on C or B).
let mut m = T28c::new(TestCtx::default());
m.step(Duration::ZERO);
assert_eq!(m.context().logs(), ["a_entry", "b_entry", "c_entry"]);
m.context_mut().log.clear();
m.send(Ev::Up).unwrap();
m.step(Duration::ZERO);
assert_eq!(m.current_state(), T28cState::B);
assert_eq!(m.context().logs(), ["c_exit"]);
}
}
hsmc/tests/det_bubbling.rs
+408
View File
@@ -0,0 +1,408 @@
#![allow(dead_code)]
//! Deterministic-flow tests for EVENT BUBBLING.
//!
//! Spec section "How events are handled":
//! Event comes in. Start at the innermost active state. Does it have a
//! handler for this event? If yes, that handler runs and the event is
//! consumed — no further handling. If no, walk up to the parent. Repeat.
//! If you walk all the way to the root and still nothing handles it, the
//! event is silently discarded.
//!
//! - A handler on a leaf state shadows a handler on its ancestor.
//! - Multiple handlers in the same state for the same trigger:
//! actions in declaration order, then the transition.
//! - Timer triggers do NOT bubble.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
LeafEv, // handled at leaf
MidEv, // handled at Mid only
RootEv, // handled at root only
Unknown, // no handler anywhere
Shadowed, // handler at both Leaf and Mid; leaf wins
MultiAct, // multiple actions in same state for same trigger
Halt,
}
statechart! {
Bub {
context: Ctx;
events: Ev;
default(Mid);
terminate(Halt);
on(RootEv) => root_handler;
state Mid {
entry: m_in;
exit: m_out;
default(Leaf);
on(MidEv) => mid_handler;
on(Shadowed) => mid_shadowed;
state Leaf {
entry: l_in;
exit: l_out;
on(LeafEv) => leaf_handler;
on(Shadowed) => leaf_shadowed;
on(MultiAct) => multi1;
on(MultiAct) => multi2;
on(MultiAct) => multi3;
}
}
}
}
impl BubActions for BubActionContext<'_> {
async fn m_in(&mut self) {}
async fn m_out(&mut self) {}
async fn l_in(&mut self) {}
async fn l_out(&mut self) {}
async fn root_handler(&mut self) {}
async fn mid_handler(&mut self) {}
async fn leaf_handler(&mut self) {}
async fn mid_shadowed(&mut self) {}
async fn leaf_shadowed(&mut self) {}
async fn multi1(&mut self) {}
async fn multi2(&mut self) {}
async fn multi3(&mut self) {}
}
const SR: u16 = 0;
const SM: u16 = 1;
const SL: u16 = 2;
// Action interning order:
// Root body: handlers (root_handler → 0)
// Mid body: m_in → 1, m_out → 2; handlers (mid_handler → 3, mid_shadowed → 4)
// Leaf body: l_in → 5, l_out → 6; handlers (leaf_handler → 7, leaf_shadowed → 8, multi1..3 → 9..11)
const A_ROOT_HANDLER: u16 = 0;
const A_MID_HANDLER: u16 = 3;
const A_LEAF_HANDLER: u16 = 7;
const A_MID_SHADOWED: u16 = 4;
const A_LEAF_SHADOWED: u16 = 8;
const A_MULTI1: u16 = 9;
const A_MULTI2: u16 = 10;
const A_MULTI3: u16 = 11;
// Event interning order:
// Root processes first: handler RootEv → 0
// Then Mid: MidEv → 1, Shadowed → 2
// Then Leaf: LeafEv → 3, Shadowed already interned, MultiAct → 4
const E_ROOTEV: u16 = 0;
const E_MIDEV: u16 = 1;
const E_SHADOWED: u16 = 2;
const E_LEAFEV: u16 = 3;
const E_MULTIACT: u16 = 4;
fn handler_act(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Handler,
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_handler_at_leaf() {
// Leaf has handler for LeafEv. Bubbling stops at Leaf.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::LeafEv).await;
let j = m.take_journal();
// Find the EventDelivered for LeafEv.
let delivered = j.iter().find(|e| {
matches!(
e,
TraceEvent::EventDelivered {
event: E_LEAFEV,
..
}
)
});
assert!(
matches!(
delivered,
Some(TraceEvent::EventDelivered {
handler_state: SL,
event: E_LEAFEV
})
),
"LeafEv must be delivered to Leaf, got: {:?}",
delivered
);
// The handler action must fire.
let saw_handler = j.iter().any(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
state: SL,
action: A_LEAF_HANDLER,
kind: ActionKind::Handler
}
)
});
assert!(saw_handler, "leaf_handler must run");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_event_bubbles_to_parent() {
// Leaf has no handler for MidEv. Bubble to Mid.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::MidEv).await;
let j = m.take_journal();
let delivered = j
.iter()
.find(|e| matches!(e, TraceEvent::EventDelivered { event: E_MIDEV, .. }));
assert!(
matches!(
delivered,
Some(TraceEvent::EventDelivered {
handler_state: SM,
event: E_MIDEV
})
),
"MidEv must be delivered to Mid, got: {:?}",
delivered
);
assert_eq!(
j.iter()
.filter(|e| matches!(
e,
TraceEvent::ActionInvoked {
action: A_MID_HANDLER,
..
}
))
.count(),
1
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_event_bubbles_to_root() {
// Neither Leaf nor Mid handles RootEv. Bubble to Root.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::RootEv).await;
let j = m.take_journal();
let delivered = j.iter().find(|e| {
matches!(
e,
TraceEvent::EventDelivered {
event: E_ROOTEV,
..
}
)
});
assert!(
matches!(
delivered,
Some(TraceEvent::EventDelivered {
handler_state: SR,
event: E_ROOTEV
})
),
"RootEv must be delivered to Root, got: {:?}",
delivered
);
assert_eq!(
j.iter()
.filter(|e| matches!(
e,
TraceEvent::ActionInvoked {
action: A_ROOT_HANDLER,
..
}
))
.count(),
1
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_unknown_event_dropped() {
// No state handles Unknown. Spec: "the event is silently discarded."
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::Unknown).await;
let j = m.take_journal();
// Must contain an EventDropped for Unknown.
let dropped = j
.iter()
.any(|e| matches!(e, TraceEvent::EventDropped { .. }));
assert!(
dropped,
"unhandled Unknown must be journaled as EventDropped"
);
// No EventDelivered for it.
let delivered_count = j
.iter()
.filter(|e| matches!(e, TraceEvent::EventDelivered { .. }))
.count();
// No EventDelivered should fire at all (we only sent Unknown).
assert_eq!(
delivered_count, 0,
"Unknown must not be delivered; got: {:?}",
j
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_leaf_shadows_parent() {
// Both Leaf and Mid have handlers for Shadowed. Leaf wins (search starts there).
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::Shadowed).await;
let j = m.take_journal();
let leaf_fired = j.iter().any(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
action: A_LEAF_SHADOWED,
..
}
)
});
let mid_fired = j.iter().any(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
action: A_MID_SHADOWED,
..
}
)
});
assert!(leaf_fired, "leaf_shadowed must fire (innermost wins)");
assert!(!mid_fired, "mid_shadowed must NOT fire (shadowed by leaf)");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_multiple_handlers_declaration_order() {
// Leaf has three actions for MultiAct. They must fire in declaration order.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::MultiAct).await;
let order: Vec<u16> = m
.take_journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
action,
kind: ActionKind::Handler,
..
} => Some(*action),
_ => None,
})
.collect();
assert_eq!(
order,
vec![A_MULTI1, A_MULTI2, A_MULTI3],
"multi-action handlers must fire in declaration order"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_handler_state_recorded_correctly() {
// EventDelivered.handler_state must reflect WHERE the handler matched, not
// where the event was sent.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::MidEv).await;
let _ = m.dispatch(Ev::RootEv).await;
let j = m.take_journal();
let mid_delivered = j
.iter()
.find(|e| matches!(e, TraceEvent::EventDelivered { event: E_MIDEV, .. }));
let root_delivered = j.iter().find(|e| {
matches!(
e,
TraceEvent::EventDelivered {
event: E_ROOTEV,
..
}
)
});
assert!(matches!(
mid_delivered,
Some(TraceEvent::EventDelivered {
handler_state: SM,
..
})
));
assert!(matches!(
root_delivered,
Some(TraceEvent::EventDelivered {
handler_state: SR,
..
})
));
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_multiple_unknown_events_each_dropped() {
// Three unknowns — three EventDropped events.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::Unknown).await;
let _ = m.dispatch(Ev::Unknown).await;
let _ = m.dispatch(Ev::Unknown).await;
let dropped_count = m
.journal()
.iter()
.filter(|e| matches!(e, TraceEvent::EventDropped { .. }))
.count();
assert_eq!(dropped_count, 3);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_bub_byte_deterministic_under_mixed_events() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Bub::new(Ctx);
let _ = m.dispatch(Ev::LeafEv).await;
let _ = m.dispatch(Ev::MidEv).await;
let _ = m.dispatch(Ev::Unknown).await;
let _ = m.dispatch(Ev::Shadowed).await;
let _ = m.dispatch(Ev::MultiAct).await;
let _ = m.dispatch(Ev::RootEv).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..15 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
hsmc/tests/det_current_state.rs
+94
View File
@@ -0,0 +1,94 @@
#![allow(dead_code)]
//! Deterministic-flow tests for `current_state()` reflecting the innermost
//! active state at every point.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::statechart;
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
GoB,
UpToParent,
Halt,
}
statechart! {
Cur {
context: Ctx;
events: Ev;
default(Parent);
terminate(Halt);
state Parent {
entry: p_in;
exit: p_out;
default(A);
state A {
entry: a_in;
exit: a_out;
on(GoB) => B;
on(UpToParent) => Parent;
}
state B {
entry: b_in;
exit: b_out;
on(UpToParent) => Parent;
}
}
}
}
impl CurActions for CurActionContext<'_> {
async fn p_in(&mut self) {}
async fn p_out(&mut self) {}
async fn a_in(&mut self) {}
async fn a_out(&mut self) {}
async fn b_in(&mut self) {}
async fn b_out(&mut self) {}
}
#[tokio::test(flavor = "current_thread")]
async fn det_current_state_initial_is_default_leaf() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Cur::new(Ctx);
// Drive initial entry by sending an event.
let _ = m.dispatch(Ev::GoB).await;
// Now in B.
assert_eq!(m.current_state(), CurState::B);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_current_state_after_lateral_transition() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Cur::new(Ctx);
let _ = m.dispatch(Ev::GoB).await;
assert_eq!(m.current_state(), CurState::B);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_current_state_after_up_returns_composite() {
// Spec: current_state can return a composite if it became innermost via
// an up-transition.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Cur::new(Ctx);
let _ = m.dispatch(Ev::UpToParent).await;
assert_eq!(
m.current_state(),
CurState::Parent,
"after up-transition, current_state returns the composite Parent"
);
})
.await;
}
hsmc/tests/det_default_ancestor.rs
+136
View File
@@ -0,0 +1,136 @@
#![allow(dead_code)]
//! Deterministic-flow tests: `default(...)` targeting an ANCESTOR.
//! Inner's `default(Outer)` is a valid up-default. Inner is reachable
//! only via an explicit transition. When entered, its default fires
//! immediately, exiting Inner back to Outer (up-transition rule:
//! Outer is not re-entered).
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
GoIn,
Halt,
}
statechart! {
AncestorDefault {
context: Ctx;
events: Ev;
default(Outer);
terminate(Halt);
state Outer {
entry: outer_in;
on(GoIn) => Inner;
state Inner {
entry: inner_in;
exit: inner_out;
// Inner's default redirects up to Outer. After entering
// Inner, this default fires as an up-transition that
// exits Inner. Outer is not re-entered.
default(Outer);
}
}
}
}
impl AncestorDefaultActions for AncestorDefaultActionContext<'_> {
async fn outer_in(&mut self) {}
async fn inner_in(&mut self) {}
async fn inner_out(&mut self) {}
}
const AD_ROOT: u16 = 0;
const AD_OUTER: u16 = 1;
const AD_INNER: u16 = 2;
#[tokio::test(flavor = "current_thread")]
async fn det_initial_lands_at_outer_no_default_descent() {
// Outer has no default of its own — initial entry stops at Outer.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = AncestorDefault::new(Ctx);
let _ = m.step(hsmc::Duration::ZERO).await;
assert_eq!(m.current_state(), AncestorDefaultState::Outer);
let j = m.take_journal();
let entered: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(entered, vec![AD_ROOT, AD_OUTER]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_explicit_into_inner_bounces_back_via_up_default() {
// `=> Inner` enters Inner (entries fire), then Inner's default fires
// as an up-transition Inner → Outer. Outer is NOT re-entered (it
// was already on the active path).
tokio::task::LocalSet::new()
.run_until(async {
let mut m = AncestorDefault::new(Ctx);
let _ = m.dispatch(Ev::GoIn).await;
assert_eq!(
m.current_state(),
AncestorDefaultState::Outer,
"Inner's default bounces us back to Outer"
);
let j = m.take_journal();
// Inner was entered (its entries fired) and then exited
// (its default fired an up-transition).
let entered_states: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
// Across the full journal: Root, Outer, Inner. After Inner's
// up-default to Outer, Outer is NOT re-entered.
assert_eq!(entered_states, vec![AD_ROOT, AD_OUTER, AD_INNER]);
let exited_states: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(
exited_states,
vec![AD_INNER],
"only Inner exits; Outer remains on the active path"
);
// Outer's entry actions ran exactly once (initial entry only).
let outer_entries = j
.iter()
.filter(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
state: AD_OUTER,
kind: hsmc::ActionKind::Entry,
..
}
)
})
.count();
assert_eq!(outer_entries, 1, "Outer is entered once and stays put");
})
.await;
}
hsmc/tests/det_default_chained.rs
+90
View File
@@ -0,0 +1,90 @@
#![allow(dead_code)]
//! Deterministic-flow tests: `default(...)` chains. Hub → Spoke1 →
//! Spoke2. Each link fires as a real LCA-aware transition. The
//! compile-time default-graph cycle check guarantees this terminates.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Halt,
}
statechart! {
ChainedDefault {
context: Ctx;
events: Ev;
default(Hub);
terminate(Halt);
state Hub {
entry: hub_in;
default(Spoke1);
}
state Spoke1 {
entry: s1_in;
exit: s1_out;
default(Spoke2);
}
state Spoke2 {
entry: s2_in;
}
}
}
impl ChainedDefaultActions for ChainedDefaultActionContext<'_> {
async fn hub_in(&mut self) {}
async fn s1_in(&mut self) {}
async fn s1_out(&mut self) {}
async fn s2_in(&mut self) {}
}
const CD_ROOT: u16 = 0;
const CD_HUB: u16 = 1;
const CD_SPOKE1: u16 = 2;
const CD_SPOKE2: u16 = 3;
#[tokio::test(flavor = "current_thread")]
async fn det_chained_defaults_terminate_at_chain_end() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = ChainedDefault::new(Ctx);
let _ = m.step(hsmc::Duration::ZERO).await;
assert_eq!(m.current_state(), ChainedDefaultState::Spoke2);
let j = m.take_journal();
let entered: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(entered, vec![CD_ROOT, CD_HUB, CD_SPOKE1, CD_SPOKE2]);
let exited: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
// Each default fires as a sibling-transition: Hub → Spoke1
// (exits Hub), then Spoke1 → Spoke2 (exits Spoke1).
assert_eq!(exited, vec![CD_HUB, CD_SPOKE1]);
// At least 2 TransitionFired events for the chained defaults.
let txn_count = j
.iter()
.filter(|e| matches!(e, TraceEvent::TransitionFired { .. }))
.count();
assert!(txn_count >= 2);
})
.await;
}
hsmc/tests/det_default_sibling.rs
+133
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#![allow(dead_code)]
//! Deterministic-flow tests: `default(...)` targeting a SIBLING fires as
//! a real LCA-aware transition immediately after the declaring state's
//! entries finish. Foyer's `default(LivingRoom)` means: enter Foyer,
//! run its entries, then immediately transition Foyer → LivingRoom
//! (LCA = Root, exits Foyer, enters LivingRoom).
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Halt,
}
statechart! {
SiblingDefault {
context: Ctx;
events: Ev;
default(Foyer);
terminate(Halt);
state Foyer {
entry: foyer_in;
exit: foyer_out;
default(LivingRoom);
}
state LivingRoom {
entry: living_in;
exit: living_out;
}
}
}
impl SiblingDefaultActions for SiblingDefaultActionContext<'_> {
async fn foyer_in(&mut self) {}
async fn foyer_out(&mut self) {}
async fn living_in(&mut self) {}
async fn living_out(&mut self) {}
}
const SD_ROOT: u16 = 0;
const SD_FOYER: u16 = 1;
const SD_LIVING: u16 = 2;
fn entered(j: &[TraceEvent]) -> Vec<u16> {
j.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect()
}
fn exited(j: &[TraceEvent]) -> Vec<u16> {
j.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect()
}
#[tokio::test(flavor = "current_thread")]
async fn det_sibling_default_exits_declarer_lands_at_target() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = SiblingDefault::new(Ctx);
let _ = m.step(hsmc::Duration::ZERO).await;
assert_eq!(m.current_state(), SiblingDefaultState::LivingRoom);
let j = m.take_journal();
assert_eq!(
entered(&j),
vec![SD_ROOT, SD_FOYER, SD_LIVING],
"Root → Foyer → (default fires) → LivingRoom"
);
assert_eq!(
exited(&j),
vec![SD_FOYER],
"Foyer is exited as the default transition's `from` state"
);
// Foyer's entry must run before its exit (default fires after entries).
let action_seq: Vec<(u16, ActionKind)> = j
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked { state, kind, .. } => Some((*state, *kind)),
_ => None,
})
.collect();
let foyer_entry_idx = action_seq
.iter()
.position(|(s, k)| *s == SD_FOYER && *k == ActionKind::Entry)
.unwrap();
let foyer_exit_idx = action_seq
.iter()
.position(|(s, k)| *s == SD_FOYER && *k == ActionKind::Exit)
.unwrap();
let living_entry_idx = action_seq
.iter()
.position(|(s, k)| *s == SD_LIVING && *k == ActionKind::Entry)
.unwrap();
assert!(foyer_entry_idx < foyer_exit_idx);
assert!(foyer_exit_idx < living_entry_idx);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_sibling_default_emits_transition_observation() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = SiblingDefault::new(Ctx);
let _ = m.step(hsmc::Duration::ZERO).await;
let j = m.take_journal();
let txn_count = j
.iter()
.filter(|e| matches!(e, TraceEvent::TransitionFired { .. }))
.count();
assert!(
txn_count >= 1,
"expected at least one TransitionFired for the default-as-transition firing"
);
})
.await;
}
hsmc/tests/det_descent.rs
+336
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@@ -0,0 +1,336 @@
#![allow(dead_code)]
//! Deterministic-flow tests for DEFAULT-DESCENT into composite targets.
//!
//! Spec section "Default child":
//! Whenever a state with children is entered, the default child is entered
//! immediately after that state's entry actions finish — it's effectively
//! an automatic transition into the child.
//!
//! Pins down: entries fire outer-to-inner, default-descent unrolls the chain,
//! the leaf is the innermost active state at the end.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Go,
Halt,
}
// Hierarchy: Root → Idle, Root → Tower → L1 → L2 → L3
statechart! {
Desc {
context: Ctx;
events: Ev;
default(Idle);
terminate(Halt);
state Idle {
entry: idle_in;
exit: idle_out;
on(Go) => Tower;
}
state Tower {
entry: tower_in;
exit: tower_out;
default(L1);
state L1 {
entry: l1_in;
exit: l1_out;
default(L2);
state L2 {
entry: l2_in;
exit: l2_out;
default(L3);
state L3 {
entry: l3_in;
exit: l3_out;
}
}
}
}
}
}
impl DescActions for DescActionContext<'_> {
async fn idle_in(&mut self) {}
async fn idle_out(&mut self) {}
async fn tower_in(&mut self) {}
async fn tower_out(&mut self) {}
async fn l1_in(&mut self) {}
async fn l1_out(&mut self) {}
async fn l2_in(&mut self) {}
async fn l2_out(&mut self) {}
async fn l3_in(&mut self) {}
async fn l3_out(&mut self) {}
}
const SR: u16 = 0;
const SI: u16 = 1;
const ST: u16 = 2;
const SL1: u16 = 3;
const SL2: u16 = 4;
const SL3: u16 = 5;
const A_IDLE_IN: u16 = 0;
const A_IDLE_OUT: u16 = 1;
const A_TOWER_IN: u16 = 2;
const A_TOWER_OUT: u16 = 3;
const A_L1_IN: u16 = 4;
const A_L1_OUT: u16 = 5;
const A_L2_IN: u16 = 6;
const A_L2_OUT: u16 = 7;
const A_L3_IN: u16 = 8;
const A_L3_OUT: u16 = 9;
const E_GO: u16 = 0;
fn entry(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Entry,
}
}
fn exit_(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Exit,
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_descent_target_with_three_default_levels() {
// Idle → Tower: Tower's `default(L1)` fires as a transition, L1's
// `default(L2)` fires, L2's `default(L3)` fires. Each link is a
// real transition with its own TransitionFired/Complete pair.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Desc::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
let actual = m.take_journal();
let expected = vec![
TraceEvent::Started {
chart_hash: Desc::<8>::CHART_HASH,
},
TraceEvent::EnterBegan { state: SR },
TraceEvent::Entered { state: SR },
// Root → Idle fires as Root's default.
TraceEvent::TransitionFired {
from: Some(SR),
to: SI,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SI },
entry(SI, A_IDLE_IN),
TraceEvent::Entered { state: SI },
TraceEvent::TransitionComplete {
from: Some(SR),
to: SI,
},
TraceEvent::EventReceived { event: E_GO },
TraceEvent::EventDelivered {
handler_state: SI,
event: E_GO,
},
TraceEvent::TransitionFired {
from: Some(SI),
to: ST,
reason: TransitionReason::Event { event: E_GO },
},
TraceEvent::ExitBegan { state: SI },
exit_(SI, A_IDLE_OUT),
TraceEvent::Exited { state: SI },
TraceEvent::EnterBegan { state: ST },
entry(ST, A_TOWER_IN),
TraceEvent::Entered { state: ST },
// Tower's default(L1) fires.
TraceEvent::TransitionFired {
from: Some(ST),
to: SL1,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SL1 },
entry(SL1, A_L1_IN),
TraceEvent::Entered { state: SL1 },
TraceEvent::TransitionComplete {
from: Some(ST),
to: SL1,
},
// L1's default(L2) fires.
TraceEvent::TransitionFired {
from: Some(SL1),
to: SL2,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SL2 },
entry(SL2, A_L2_IN),
TraceEvent::Entered { state: SL2 },
TraceEvent::TransitionComplete {
from: Some(SL1),
to: SL2,
},
// L2's default(L3) fires.
TraceEvent::TransitionFired {
from: Some(SL2),
to: SL3,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SL3 },
entry(SL3, A_L3_IN),
TraceEvent::Entered { state: SL3 },
TraceEvent::TransitionComplete {
from: Some(SL2),
to: SL3,
},
TraceEvent::TransitionComplete {
from: Some(SI),
to: ST,
},
];
assert_eq!(actual, expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_descent_entries_fire_outer_to_inner() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Desc::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
// After the GO event-driven transition: order of Entered
// events should be Tower → L1 → L2 → L3. We split on the
// event-driven TransitionFired specifically (initial-entry
// defaults emit TransitionFired{Internal} too).
let split = m
.journal()
.iter()
.position(|e| {
matches!(
e,
TraceEvent::TransitionFired {
reason: TransitionReason::Event { .. },
..
}
)
})
.unwrap();
let entered: Vec<u16> = m.journal()[split..]
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(entered, vec![ST, SL1, SL2, SL3]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_descent_termination_exits_full_chain() {
// After full descent into L3, terminate exits L3 → L2 → L1 → Tower → Root.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Desc::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
let _ = m.dispatch(Ev::Halt).await;
let exits: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(exits, vec![SI, SL3, SL2, SL1, ST, SR]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_descent_action_kind_sequence() {
// After GO: Tower entry kind, L1 entry, L2 entry, L3 entry. All Entry.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Desc::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
// Split on the event-driven TransitionFired (the initial
// default-fire is also TransitionFired{Internal} but happens
// before GO).
let split = m
.journal()
.iter()
.position(|e| {
matches!(
e,
TraceEvent::TransitionFired {
reason: TransitionReason::Event { .. },
..
}
)
})
.unwrap();
// After the Idle exit, all subsequent ActionInvoked must be Entry kind.
let kinds_after_exit: Vec<ActionKind> = m.journal()[split + 3..]
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked { kind, .. } => Some(*kind),
_ => None,
})
.collect();
assert!(
kinds_after_exit.iter().all(|k| *k == ActionKind::Entry),
"all post-transition actions must be Entry kind, got {:?}",
kinds_after_exit
);
assert_eq!(kinds_after_exit.len(), 4, "Tower + L1 + L2 + L3 entries");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_descent_byte_deterministic() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Desc::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_descent_initial_descent_is_idle_only() {
// Initial default chain is Root → Idle. Idle has no children, so only one Entered.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Desc::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let entered: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(entered, vec![SR, SI]);
})
.await;
}
hsmc/tests/det_during.rs
+252
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@@ -0,0 +1,252 @@
#![allow(dead_code)]
//! Deterministic-flow tests for `during:` activities.
//!
//! Spec section "during: activities":
//! A `during:` is an async function that runs while its owning state is on
//! the active path. It is started after the entry actions of that state
//! finish, and it is cancelled before the exit actions of that state begin.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use core::time::Duration;
use hsmc::{statechart, ActionKind, TraceEvent};
#[derive(Default)]
pub struct Ctx {
pub a: u32,
pub b: u32,
pub c: u32,
}
#[derive(Debug, Clone)]
pub enum Ev {
Done,
Halt,
}
statechart! {
Du {
context: Ctx;
events: Ev;
default(Working);
terminate(Halt);
state Working {
entry: w_in;
exit: w_out;
during: tick_a(a);
during: tick_b(b);
on(Done) => Idle;
}
state Idle {
entry: i_in;
exit: i_out;
}
}
}
impl DuActions for DuActionContext<'_> {
async fn w_in(&mut self) {}
async fn w_out(&mut self) {}
async fn i_in(&mut self) {}
async fn i_out(&mut self) {}
}
async fn tick_a(_a: &mut u32) -> Ev {
// Pause for a long time; this future will likely be cancelled before
// completing so we exercise the cancel path.
tokio::time::sleep(Duration::from_secs(60)).await;
Ev::Done
}
async fn tick_b(_b: &mut u32) -> Ev {
tokio::time::sleep(Duration::from_secs(60)).await;
Ev::Done
}
const SR: u16 = 0;
const SW: u16 = 1;
const SI: u16 = 2;
#[tokio::test(flavor = "current_thread")]
async fn det_during_started_after_entries() {
// Spec: started AFTER entry actions of the owning state finish.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
// Find Working's entry action invocation.
let w_entry_idx = j.iter().position(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
state: SW,
kind: ActionKind::Entry,
..
}
)
});
// Find first DuringStarted on Working.
let d_started_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::DuringStarted { state: SW, .. }));
assert!(w_entry_idx.is_some());
assert!(d_started_idx.is_some());
assert!(
w_entry_idx.unwrap() < d_started_idx.unwrap(),
"DuringStarted must come AFTER entry actions"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_during_cancelled_before_exits() {
// Spec: cancelled BEFORE exit actions of the owning state begin.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
let d_cancelled_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::DuringCancelled { state: SW, .. }));
let w_exit_idx = j.iter().position(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
state: SW,
kind: ActionKind::Exit,
..
}
)
});
assert!(d_cancelled_idx.is_some(), "DuringCancelled must appear");
assert!(w_exit_idx.is_some(), "exit actions must run");
assert!(
d_cancelled_idx.unwrap() < w_exit_idx.unwrap(),
"DuringCancelled must come BEFORE exit actions"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_during_two_durings_two_started_two_cancelled() {
// Two durings declared on Working — should see two DuringStarted and two DuringCancelled.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
let started = j
.iter()
.filter(|e| matches!(e, TraceEvent::DuringStarted { state: SW, .. }))
.count();
let cancelled = j
.iter()
.filter(|e| matches!(e, TraceEvent::DuringCancelled { state: SW, .. }))
.count();
assert_eq!(started, 2);
assert_eq!(cancelled, 2);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_during_indices_are_declaration_order() {
// Indices 0, 1 in declaration order.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Halt).await;
let started_indices: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::DuringStarted { during, .. } => Some(*during),
_ => None,
})
.collect();
assert_eq!(started_indices, vec![0, 1]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_during_cancelled_indices_match() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Halt).await;
let cancelled_indices: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::DuringCancelled { during, .. } => Some(*during),
_ => None,
})
.collect();
// Cancellation also walks declaration order in the current implementation.
assert_eq!(cancelled_indices, vec![0, 1]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_during_state_id_matches() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Halt).await;
let started_states: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::DuringStarted { state, .. } => Some(*state),
_ => None,
})
.collect();
// Both DuringStarted events refer to Working (id 1).
assert!(started_states.iter().all(|&s| s == SW));
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_during_no_durings_on_idle() {
// Idle has no `during:` declarations. After we transition into Idle, no
// DuringStarted for Idle.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Done).await;
let on_idle: usize = m
.journal()
.iter()
.filter(|e| matches!(e, TraceEvent::DuringStarted { state: SI, .. }))
.count();
assert_eq!(on_idle, 0);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_during_byte_deterministic() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Du::new(Ctx::default());
let _ = m.dispatch(Ev::Done).await;
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
hsmc/tests/det_emit.rs
+255
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@@ -0,0 +1,255 @@
#![allow(dead_code)]
//! Deterministic-flow tests for `emit()` from action code.
//!
//! Spec section "emit()":
//! The event goes on the machine's internal queue. It is NOT processed
//! immediately. The runtime finishes handling whatever event it's
//! currently handling — including every entry and exit action of any
//! transition — and only then dequeues `Ev` and dispatches it normally.
//! No re-entrant dispatch.
//!
//! If the queue is full, `emit()` returns `Err(QueueFull)`. Subsequent
//! actions in the same chain still run; they may attempt further emits,
//! but those also fail.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Trigger,
Followup,
Many,
Halt,
}
statechart! {
Em {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
state A {
entry: a_in;
exit: a_out;
on(Trigger) => emit_followup;
on(Followup) => B;
on(Many) => emit_many;
}
state B {
entry: b_in;
exit: b_out;
}
}
}
impl EmActions for EmActionContext<'_> {
async fn a_in(&mut self) {}
async fn a_out(&mut self) {}
async fn b_in(&mut self) {}
async fn b_out(&mut self) {}
async fn emit_followup(&mut self) {
let _ = self.emit(Ev::Followup);
}
async fn emit_many(&mut self) {
// Try to overflow the queue; capacity is 8 by default.
for _ in 0..15 {
let _ = self.emit(Ev::Followup);
}
}
}
const E_TRIGGER: u16 = 0;
const E_FOLLOWUP: u16 = 1;
const E_MANY: u16 = 2;
#[tokio::test(flavor = "current_thread")]
async fn det_emit_queues_event() {
// emit_followup queues Followup. Journal must have EmitQueued.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Em::new(Ctx);
let _ = m.dispatch(Ev::Trigger).await;
let queued = m
.journal()
.iter()
.filter(|e| matches!(e, TraceEvent::EmitQueued { .. }))
.count();
assert_eq!(queued, 1, "exactly one EmitQueued, got {:?}", m.journal());
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_followup_event_is_dispatched() {
// After Trigger fires emit_followup, the queue contains Followup.
// dispatch() drains, so Followup is dispatched and transitions A → B.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Em::new(Ctx);
let _ = m.dispatch(Ev::Trigger).await;
let j = m.take_journal();
// Both Trigger and Followup must be EventDelivered.
let delivered_events: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::EventDelivered { event, .. } => Some(*event),
_ => None,
})
.collect();
assert_eq!(delivered_events, vec![E_TRIGGER, E_FOLLOWUP]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_no_reentrant_dispatch() {
// Spec: emit during a handler must not re-enter the dispatcher inside the
// current handler. The emit_followup action does ONE thing: emit. Then it
// returns. ONLY THEN does the dispatcher pick up Followup.
//
// Verify: the EmitQueued event for Followup appears BEFORE the
// EventDelivered for Followup.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Em::new(Ctx);
let _ = m.dispatch(Ev::Trigger).await;
let j = m.take_journal();
let queued_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::EmitQueued { event: E_FOLLOWUP }))
.unwrap();
let delivered_idx = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::EventDelivered {
event: E_FOLLOWUP,
..
}
)
})
.unwrap();
assert!(
queued_idx < delivered_idx,
"EmitQueued ({}) must come before EventDelivered ({})",
queued_idx,
delivered_idx
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_overflow_records_emitfailed() {
// emit_many tries 15 emits. Default queue cap is 8 (one slot has Many in
// it currently being processed; 7 more fit). Some succeed, some fail.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Em::new(Ctx);
let _ = m.dispatch(Ev::Many).await;
let j = m.take_journal();
let queued = j
.iter()
.filter(|e| matches!(e, TraceEvent::EmitQueued { .. }))
.count();
let failed = j
.iter()
.filter(|e| matches!(e, TraceEvent::EmitFailed { .. }))
.count();
assert!(queued > 0, "some emits must succeed");
assert!(failed > 0, "some emits must fail when queue overflows");
assert_eq!(queued + failed, 15, "total emit attempts must be 15");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_does_not_reorder_external_events() {
// External events still process in arrival order. Emitted events are
// appended to the queue (FIFO).
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Em::new(Ctx);
let _ = m.dispatch(Ev::Trigger).await;
let j = m.take_journal();
let delivered_events: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::EventDelivered { event, .. } => Some(*event),
_ => None,
})
.collect();
// Trigger was delivered first, then the emitted Followup.
assert_eq!(delivered_events[0], E_TRIGGER);
assert_eq!(delivered_events[1], E_FOLLOWUP);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_byte_deterministic() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Em::new(Ctx);
let _ = m.dispatch(Ev::Trigger).await;
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_state_after_emit_action_runs_to_completion() {
// Spec: subsequent actions in the same chain still run after emit failure.
// Hard to test surgically without an action-after-emit; pin instead that
// the EmitFailed events are followed by additional ActionInvoked events
// for the SAME emit_many handler call.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Em::new(Ctx);
let _ = m.dispatch(Ev::Many).await;
let j = m.take_journal();
// The handler emit_many is one call; it emits 15 times. So we should see
// 15 emit-result events all between two boundaries: after Many's
// EventDelivered and before any subsequent Followup deliveries.
let many_delivered_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::EventDelivered { event: E_MANY, .. }))
.unwrap();
let emit_results: Vec<&TraceEvent> = j[many_delivered_idx..]
.iter()
.take_while(|e| {
matches!(
e,
TraceEvent::EmitQueued { .. }
| TraceEvent::EmitFailed { .. }
| TraceEvent::ActionInvoked { .. }
| TraceEvent::EventDelivered { event: E_MANY, .. }
)
})
.filter(|e| {
matches!(
e,
TraceEvent::EmitQueued { .. } | TraceEvent::EmitFailed { .. }
)
})
.collect();
assert_eq!(emit_results.len(), 15);
})
.await;
}
hsmc/tests/det_emit_during_transition.rs
+141
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@@ -0,0 +1,141 @@
#![allow(dead_code)]
//! Tests that an `emit()` from inside an entry/exit action gets queued
//! BEFORE the transition completes, but is dispatched AFTER.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Go,
Cleanup, // emitted from A's exit action
Wakeup, // emitted from B's entry action
Halt,
}
statechart! {
Et {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
on(Cleanup) => log_cleanup;
on(Wakeup) => log_wakeup;
state A {
entry: a_in;
exit: emit_cleanup;
on(Go) => B;
}
state B {
entry: emit_wakeup;
exit: b_out;
}
}
}
impl EtActions for EtActionContext<'_> {
async fn a_in(&mut self) {}
async fn b_out(&mut self) {}
async fn emit_cleanup(&mut self) {
let _ = self.emit(Ev::Cleanup);
}
async fn emit_wakeup(&mut self) {
let _ = self.emit(Ev::Wakeup);
}
async fn log_cleanup(&mut self) {}
async fn log_wakeup(&mut self) {}
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_in_exit_action_runs_after_transition() {
// Spec: emitted events are processed only after the current event has
// fully finished — including all entry/exit actions.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Et::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
let j = m.take_journal();
// Find indices of EmitQueued for Cleanup, EmitQueued for Wakeup, and
// EventDelivered for each.
// Event ids in interning order: Cleanup=0, Wakeup=1 (root handlers first),
// Go=2 (A handler), Halt=3 (terminate at end of build).
let cleanup_queued = j
.iter()
.position(|e| matches!(e, TraceEvent::EmitQueued { event: 0 }));
let wakeup_queued = j
.iter()
.position(|e| matches!(e, TraceEvent::EmitQueued { event: 1 }));
let cleanup_delivered = j
.iter()
.position(|e| matches!(e, TraceEvent::EventDelivered { event: 0, .. }));
let wakeup_delivered = j
.iter()
.position(|e| matches!(e, TraceEvent::EventDelivered { event: 1, .. }));
assert!(cleanup_queued.is_some(), "Cleanup must be queued");
assert!(wakeup_queued.is_some(), "Wakeup must be queued");
assert!(cleanup_delivered.is_some(), "Cleanup must be delivered");
assert!(wakeup_delivered.is_some(), "Wakeup must be delivered");
// Both emits queue BEFORE either is delivered (no re-entrant dispatch
// inside the original Go transition).
assert!(cleanup_queued.unwrap() < cleanup_delivered.unwrap());
assert!(
wakeup_queued.unwrap() < cleanup_delivered.unwrap(),
"Wakeup queued before Cleanup delivered (transition completes first)"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_in_exit_action_journals_in_order() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Et::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
let j = m.take_journal();
// Both Cleanup and Wakeup were queued during the Go transition. They
// are delivered AFTER. Order: Cleanup first (emitted from A's exit
// which runs first), then Wakeup (emitted from B's entry).
let queued_events: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::EmitQueued { event } => Some(*event),
_ => None,
})
.collect();
assert_eq!(
queued_events,
vec![0, 1],
"Cleanup (id 0) then Wakeup (id 1)"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_emit_in_transition_byte_deterministic() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Et::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
hsmc/tests/det_initial.rs
+364
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@@ -0,0 +1,364 @@
#![allow(dead_code)]
//! Deterministic-flow tests for INITIAL ENTRY and DEFAULT DESCENT.
//!
//! Pins down the semantics from `docs/002. hsmc-semantics-formal.md`,
//! section "Where the machine 'is'":
//!
//! At any moment, the machine is in a path of states from root down to one
//! innermost state. ... The root is always active until the machine
//! terminates.
//!
//! And from "Default child":
//!
//! Whenever a state with children is entered, the default child is entered
//! immediately after that state's entry actions finish — it's effectively
//! an automatic transition into the child.
//!
//! Each test compares the FULL journal to a hand-built EXPECTED sequence.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Halt,
}
// 4-level hierarchy: Root → A → B → C → D
statechart! {
Init4 {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
entry: r_in;
exit: r_out;
state A {
entry: a_in;
exit: a_out;
default(B);
state B {
entry: b_in;
exit: b_out;
default(C);
state C {
entry: c_in;
exit: c_out;
default(D);
state D {
entry: d_in;
exit: d_out;
}
}
}
}
}
}
impl Init4Actions for Init4ActionContext<'_> {
async fn r_in(&mut self) {}
async fn r_out(&mut self) {}
async fn a_in(&mut self) {}
async fn a_out(&mut self) {}
async fn b_in(&mut self) {}
async fn b_out(&mut self) {}
async fn c_in(&mut self) {}
async fn c_out(&mut self) {}
async fn d_in(&mut self) {}
async fn d_out(&mut self) {}
}
// State ids: 0=Root, 1=A, 2=B, 3=C, 4=D.
const SR: u16 = 0;
const SA: u16 = 1;
const SB: u16 = 2;
const SC: u16 = 3;
const SD: u16 = 4;
// Action ids in declaration order: 0=r_in, 1=r_out, 2=a_in, 3=a_out,
// 4=b_in, 5=b_out, 6=c_in, 7=c_out, 8=d_in, 9=d_out.
const A_R_IN: u16 = 0;
const A_R_OUT: u16 = 1;
const A_A_IN: u16 = 2;
const A_A_OUT: u16 = 3;
const A_B_IN: u16 = 4;
const A_B_OUT: u16 = 5;
const A_C_IN: u16 = 6;
const A_C_OUT: u16 = 7;
const A_D_IN: u16 = 8;
const A_D_OUT: u16 = 9;
// Halt = event 0 (interned via `terminate(Halt)`).
const E_HALT: u16 = 0;
fn entry(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Entry,
}
}
fn exit_(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Exit,
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_initial_descent_records_full_path() {
// Spec: "the root is always active" + default-descent unrolls Root → A → B → C → D.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
// Push Halt to drive the chart through initial entry then termination.
let _ = m.dispatch(Ev::Halt).await;
let actual = m.take_journal();
let expected = vec![
// Initial enter (driven by dispatch's prime-state branch).
// Each `default(...)` is a real transition, so the journal
// brackets every default-fire with TransitionFired
// (Internal) / TransitionComplete pairs.
TraceEvent::Started {
chart_hash: Init4::<8>::CHART_HASH,
},
TraceEvent::EnterBegan { state: SR },
entry(SR, A_R_IN),
TraceEvent::Entered { state: SR },
TraceEvent::TransitionFired {
from: Some(SR),
to: SA,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SA },
entry(SA, A_A_IN),
TraceEvent::Entered { state: SA },
TraceEvent::TransitionComplete {
from: Some(SR),
to: SA,
},
TraceEvent::TransitionFired {
from: Some(SA),
to: SB,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SB },
entry(SB, A_B_IN),
TraceEvent::Entered { state: SB },
TraceEvent::TransitionComplete {
from: Some(SA),
to: SB,
},
TraceEvent::TransitionFired {
from: Some(SB),
to: SC,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SC },
entry(SC, A_C_IN),
TraceEvent::Entered { state: SC },
TraceEvent::TransitionComplete {
from: Some(SB),
to: SC,
},
TraceEvent::TransitionFired {
from: Some(SC),
to: SD,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SD },
entry(SD, A_D_IN),
TraceEvent::Entered { state: SD },
TraceEvent::TransitionComplete {
from: Some(SC),
to: SD,
},
// Halt.
TraceEvent::EventReceived { event: E_HALT },
TraceEvent::TerminateRequested { event: E_HALT },
// Bottom-up exit chain.
TraceEvent::ExitBegan { state: SD },
exit_(SD, A_D_OUT),
TraceEvent::Exited { state: SD },
TraceEvent::ExitBegan { state: SC },
exit_(SC, A_C_OUT),
TraceEvent::Exited { state: SC },
TraceEvent::ExitBegan { state: SB },
exit_(SB, A_B_OUT),
TraceEvent::Exited { state: SB },
TraceEvent::ExitBegan { state: SA },
exit_(SA, A_A_OUT),
TraceEvent::Exited { state: SA },
TraceEvent::ExitBegan { state: SR },
exit_(SR, A_R_OUT),
TraceEvent::Exited { state: SR },
TraceEvent::Terminated,
];
let mismatch = actual
.iter()
.zip(expected.iter())
.position(|(a, e)| a != e)
.map(|i| i.to_string())
.unwrap_or_else(|| "<length>".to_string());
assert_eq!(actual, expected, "first mismatch at index {mismatch}");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_started_is_first_event() {
// Spec: every journal begins with Started carrying the chart hash.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let j = m.journal();
assert!(matches!(j[0], TraceEvent::Started { .. }));
if let TraceEvent::Started { chart_hash } = j[0] {
assert_eq!(chart_hash, Init4::<8>::CHART_HASH);
}
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_chart_hash_nonzero() {
// The FNV-1a fingerprint must actually have run.
assert_ne!(Init4::<8>::CHART_HASH, 0);
}
#[tokio::test(flavor = "current_thread")]
async fn det_root_state_id_is_zero() {
// Spec: "the root state (the machine itself) is just a state". It's
// allocated first and so gets id 0; tests below depend on this.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
// First Entered event must be state 0.
let first_entered = m
.journal()
.iter()
.find(|e| matches!(e, TraceEvent::Entered { .. }));
assert!(matches!(
first_entered,
Some(TraceEvent::Entered { state: 0 })
));
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_entry_actions_fire_outer_to_inner() {
// Spec: "Entry runs outer-to-inner."
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let entered: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state,
kind: ActionKind::Entry,
..
} => Some(*state),
_ => None,
})
.collect();
assert_eq!(
entered,
vec![SR, SA, SB, SC, SD],
"entry actions must fire outer-to-inner across hierarchy"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_exit_actions_fire_inner_to_outer() {
// Spec: "Exit runs inner-to-outer."
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let exited: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state,
kind: ActionKind::Exit,
..
} => Some(*state),
_ => None,
})
.collect();
assert_eq!(
exited,
vec![SD, SC, SB, SA, SR],
"exit actions must fire inner-to-outer across hierarchy"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_state_ids_are_declaration_order() {
// Spec: state ids assigned in parse order (0=root, then nested).
// Verify by checking the order Entered events appear.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let entered_ids: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(entered_ids, vec![SR, SA, SB, SC, SD]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_initial_descent_byte_deterministic_across_runs() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..20 {
assert_eq!(first, run().await, "divergence on run {i}");
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminated_is_last_event() {
// Spec: "Always the final event in the journal."
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Init4::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
assert!(matches!(m.journal().last(), Some(TraceEvent::Terminated)));
})
.await;
}
hsmc/tests/det_lateral.rs
+571
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@@ -0,0 +1,571 @@
#![allow(dead_code)]
//! Deterministic-flow tests for LATERAL transitions (target not on active path).
//!
//! Spec section "Transitioning to a sibling (or anywhere not on your active path)":
//! The standard case. LCA is somewhere strictly above both current and
//! target. Exit up to LCA, enter down to target, default-descend if the
//! target has children.
//!
//! Also pins down that the LCA itself is **not** exited or re-entered.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
GoB,
GoC,
GoD,
GoE,
Halt,
}
// Hierarchy:
// Root
// ├── Parent
// │ ├── A (default)
// │ └── B
// ├── C
// └── D
// └── E
statechart! {
Lat {
context: Ctx;
events: Ev;
default(Parent);
terminate(Halt);
state Parent {
entry: p_in;
exit: p_out;
default(A);
state A {
entry: a_in;
exit: a_out;
on(GoB) => B;
on(GoC) => C;
on(GoD) => D;
on(GoE) => E;
}
state B {
entry: b_in;
exit: b_out;
on(GoC) => C;
}
}
state C {
entry: c_in;
exit: c_out;
}
state D {
entry: d_in;
exit: d_out;
default(E);
state E {
entry: e_in;
exit: e_out;
}
}
}
}
impl LatActions for LatActionContext<'_> {
async fn p_in(&mut self) {}
async fn p_out(&mut self) {}
async fn a_in(&mut self) {}
async fn a_out(&mut self) {}
async fn b_in(&mut self) {}
async fn b_out(&mut self) {}
async fn c_in(&mut self) {}
async fn c_out(&mut self) {}
async fn d_in(&mut self) {}
async fn d_out(&mut self) {}
async fn e_in(&mut self) {}
async fn e_out(&mut self) {}
}
// State ids: 0=Root, 1=Parent, 2=A, 3=B, 4=C, 5=D, 6=E.
const SR: u16 = 0;
const SP: u16 = 1;
const SA: u16 = 2;
const SB: u16 = 3;
const SC: u16 = 4;
const SD: u16 = 5;
const SE: u16 = 6;
// Action ids in declaration order: 0=p_in, 1=p_out, 2=a_in, 3=a_out,
// 4=b_in, 5=b_out, 6=c_in, 7=c_out, 8=d_in, 9=d_out, 10=e_in, 11=e_out.
const A_P_IN: u16 = 0;
const A_P_OUT: u16 = 1;
const A_A_IN: u16 = 2;
const A_A_OUT: u16 = 3;
const A_B_IN: u16 = 4;
const A_B_OUT: u16 = 5;
const A_C_IN: u16 = 6;
const A_C_OUT: u16 = 7;
const A_D_IN: u16 = 8;
const A_D_OUT: u16 = 9;
const A_E_IN: u16 = 10;
const A_E_OUT: u16 = 11;
// Event ids in first-seen order: 0=GoB, 1=GoC, 2=GoD, 3=GoE, 4=Halt.
const E_GOB: u16 = 0;
const E_GOC: u16 = 1;
const E_GOD: u16 = 2;
const E_GOE: u16 = 3;
fn entry(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Entry,
}
}
fn exit_(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Exit,
}
}
#[allow(dead_code)]
fn handler(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Handler,
}
}
// Initial descent: Root → (Root's default fires) → Parent → (Parent's
// default fires) → A. Each default-fire is a real transition.
fn initial_descent() -> Vec<TraceEvent> {
vec![
TraceEvent::Started {
chart_hash: Lat::<8>::CHART_HASH,
},
TraceEvent::EnterBegan { state: SR },
TraceEvent::Entered { state: SR },
TraceEvent::TransitionFired {
from: Some(SR),
to: SP,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SP },
entry(SP, A_P_IN),
TraceEvent::Entered { state: SP },
TraceEvent::TransitionComplete {
from: Some(SR),
to: SP,
},
TraceEvent::TransitionFired {
from: Some(SP),
to: SA,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SA },
entry(SA, A_A_IN),
TraceEvent::Entered { state: SA },
TraceEvent::TransitionComplete {
from: Some(SP),
to: SA,
},
]
}
// Compare actual vs expected and report first mismatch.
fn assert_journal(actual: &[TraceEvent], expected: &[TraceEvent]) {
let mismatch = actual.iter().zip(expected.iter()).position(|(a, e)| a != e);
if let Some(i) = mismatch {
panic!(
"journal mismatch at index {}\n actual: {:?}\n expected: {:?}\n full actual: {:#?}",
i, actual[i], expected[i], actual
);
}
assert_eq!(
actual.len(),
expected.len(),
"journal length mismatch: actual {} vs expected {}\n full actual: {:#?}",
actual.len(),
expected.len(),
actual
);
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_a_to_b_lca_is_parent() {
// Spec: A → B (siblings under Parent). LCA = Parent. Parent is not exited
// or re-entered.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoB).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_GOB },
TraceEvent::EventDelivered {
handler_state: SA,
event: E_GOB,
},
TraceEvent::TransitionFired {
from: Some(SA),
to: SB,
reason: TransitionReason::Event { event: E_GOB },
},
TraceEvent::ExitBegan { state: SA },
exit_(SA, A_A_OUT),
TraceEvent::Exited { state: SA },
TraceEvent::EnterBegan { state: SB },
entry(SB, A_B_IN),
TraceEvent::Entered { state: SB },
TraceEvent::TransitionComplete {
from: Some(SA),
to: SB,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_a_to_c_exits_parent() {
// A → C: A is inside Parent, C is sibling of Parent. LCA = Root.
// Exit A, exit Parent. Enter C.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoC).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_GOC },
TraceEvent::EventDelivered {
handler_state: SA,
event: E_GOC,
},
TraceEvent::TransitionFired {
from: Some(SA),
to: SC,
reason: TransitionReason::Event { event: E_GOC },
},
TraceEvent::ExitBegan { state: SA },
exit_(SA, A_A_OUT),
TraceEvent::Exited { state: SA },
TraceEvent::ExitBegan { state: SP },
exit_(SP, A_P_OUT),
TraceEvent::Exited { state: SP },
TraceEvent::EnterBegan { state: SC },
entry(SC, A_C_IN),
TraceEvent::Entered { state: SC },
TraceEvent::TransitionComplete {
from: Some(SA),
to: SC,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_target_with_children_default_descends() {
// A → D: D has child E (default). After entering D, default-descend to E.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoD).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_GOD },
TraceEvent::EventDelivered {
handler_state: SA,
event: E_GOD,
},
TraceEvent::TransitionFired {
from: Some(SA),
to: SD,
reason: TransitionReason::Event { event: E_GOD },
},
TraceEvent::ExitBegan { state: SA },
exit_(SA, A_A_OUT),
TraceEvent::Exited { state: SA },
TraceEvent::ExitBegan { state: SP },
exit_(SP, A_P_OUT),
TraceEvent::Exited { state: SP },
TraceEvent::EnterBegan { state: SD },
entry(SD, A_D_IN),
TraceEvent::Entered { state: SD },
// D's `default(E)` fires as an internal transition.
TraceEvent::TransitionFired {
from: Some(SD),
to: SE,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SE },
entry(SE, A_E_IN),
TraceEvent::Entered { state: SE },
TraceEvent::TransitionComplete {
from: Some(SD),
to: SE,
},
TraceEvent::TransitionComplete {
from: Some(SA),
to: SD,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_to_deeply_nested_target() {
// A → E (E is the leaf of D's default chain). The target itself is the leaf
// so default-descent doesn't add another level — but D is entered along the way.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoE).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_GOE },
TraceEvent::EventDelivered {
handler_state: SA,
event: E_GOE,
},
TraceEvent::TransitionFired {
from: Some(SA),
to: SE,
reason: TransitionReason::Event { event: E_GOE },
},
TraceEvent::ExitBegan { state: SA },
exit_(SA, A_A_OUT),
TraceEvent::Exited { state: SA },
TraceEvent::ExitBegan { state: SP },
exit_(SP, A_P_OUT),
TraceEvent::Exited { state: SP },
TraceEvent::EnterBegan { state: SD },
entry(SD, A_D_IN),
TraceEvent::Entered { state: SD },
TraceEvent::EnterBegan { state: SE },
entry(SE, A_E_IN),
TraceEvent::Entered { state: SE },
TraceEvent::TransitionComplete {
from: Some(SA),
to: SE,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_chained_transitions() {
// A → B → C: two consecutive transitions. Each independently records its
// exits and entries.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoB).await;
let _ = m.dispatch(Ev::GoC).await;
let actual = m.take_journal();
let mut expected = initial_descent();
// A → B
expected.extend(vec![
TraceEvent::EventReceived { event: E_GOB },
TraceEvent::EventDelivered {
handler_state: SA,
event: E_GOB,
},
TraceEvent::TransitionFired {
from: Some(SA),
to: SB,
reason: TransitionReason::Event { event: E_GOB },
},
TraceEvent::ExitBegan { state: SA },
exit_(SA, A_A_OUT),
TraceEvent::Exited { state: SA },
TraceEvent::EnterBegan { state: SB },
entry(SB, A_B_IN),
TraceEvent::Entered { state: SB },
TraceEvent::TransitionComplete {
from: Some(SA),
to: SB,
},
]);
// B → C (LCA = Root, so Parent exits too).
expected.extend(vec![
TraceEvent::EventReceived { event: E_GOC },
TraceEvent::EventDelivered {
handler_state: SB,
event: E_GOC,
},
TraceEvent::TransitionFired {
from: Some(SB),
to: SC,
reason: TransitionReason::Event { event: E_GOC },
},
TraceEvent::ExitBegan { state: SB },
exit_(SB, A_B_OUT),
TraceEvent::Exited { state: SB },
TraceEvent::ExitBegan { state: SP },
exit_(SP, A_P_OUT),
TraceEvent::Exited { state: SP },
TraceEvent::EnterBegan { state: SC },
entry(SC, A_C_IN),
TraceEvent::Entered { state: SC },
TraceEvent::TransitionComplete {
from: Some(SB),
to: SC,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_lca_stays_active() {
// A → B: Parent (the LCA) must NOT appear in any Exited or Entered event.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoB).await;
let j = m.take_journal();
// After initial Entered(Parent), Parent must not appear again.
let initial_p_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::Entered { state: SP }))
.unwrap();
let parent_events: Vec<&TraceEvent> = j
.iter()
.skip(initial_p_idx + 1)
.filter(|e| {
matches!(
e,
TraceEvent::Entered { state: SP } | TraceEvent::Exited { state: SP }
)
})
.collect();
assert!(
parent_events.is_empty(),
"LCA Parent must not be re-entered or exited; got: {:?}",
parent_events
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_exit_inner_then_outer() {
// A → C: exit A first (deeper), then Parent (outer).
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoC).await;
let exits: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
// First exit must be A (deeper), then Parent (outer).
assert_eq!(&exits[..2], &[SA, SP], "exits must be inner-to-outer");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_entry_outer_then_inner() {
// A → D where D has child E: enter D first, then E.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoD).await;
let entries: Vec<u16> = m
.journal()
.iter()
.skip_while(|e| {
!matches!(
e,
TraceEvent::TransitionFired {
reason: TransitionReason::Event { .. },
..
}
)
})
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(
&entries,
&[SD, SE],
"entries on the way down must be outer-to-inner"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_no_default_when_target_is_leaf() {
// A → C where C is a leaf: no default-descent, journal stops at C.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoC).await;
let last_entered: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
// Initial: Root, Parent, A. After GoC: C. No further entries.
assert_eq!(last_entered, vec![SR, SP, SA, SC]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_event_delivered_records_handler_state() {
// The handler for GoB lives on A. EventDelivered.handler_state = A.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Lat::new(Ctx);
let _ = m.dispatch(Ev::GoB).await;
let delivered = m
.journal()
.iter()
.find(|e| matches!(e, TraceEvent::EventDelivered { event: E_GOB, .. }));
assert!(
matches!(
delivered,
Some(TraceEvent::EventDelivered {
handler_state: SA,
event: E_GOB
})
),
"got: {:?}",
delivered
);
})
.await;
}
hsmc/tests/det_optional_default.rs
+218
View File
@@ -0,0 +1,218 @@
#![allow(dead_code)]
//! Deterministic-flow tests for OPTIONAL `default(...)` on composite states.
//!
//! Spec: a composite state may declare `default(...)` or omit it. When
//! omitted, transitions targeting the composite land on the composite itself
//! — no default-descent. Substates are reachable only via explicit
//! transitions. This is the "microwave" pattern: a `Standby` state with
//! sub-modes (e.g. `LowPower`) that the chart enters only on demand.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
PowerOn,
PowerOff,
EnterLowPower,
LeaveLowPower,
Halt,
}
statechart! {
Microwave {
context: Ctx;
events: Ev;
default(Standby);
terminate(Halt);
state Standby {
// No `default(...)` — Standby itself is the resting state.
entry: standby_in;
exit: standby_out;
on(PowerOn) => On;
on(EnterLowPower) => LowPower;
state LowPower {
entry: low_in;
exit: low_out;
on(LeaveLowPower) => Standby;
}
}
state On {
entry: on_in;
exit: on_out;
on(PowerOff) => Standby;
}
}
}
impl MicrowaveActions for MicrowaveActionContext<'_> {
async fn standby_in(&mut self) {}
async fn standby_out(&mut self) {}
async fn low_in(&mut self) {}
async fn low_out(&mut self) {}
async fn on_in(&mut self) {}
async fn on_out(&mut self) {}
}
// State ids: 0=Root, 1=Standby, 2=LowPower, 3=On.
const SR: u16 = 0;
const S_STANDBY: u16 = 1;
const S_LOW: u16 = 2;
const S_ON: u16 = 3;
fn entered_states(j: &[TraceEvent]) -> Vec<u16> {
j.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect()
}
fn exited_states(j: &[TraceEvent]) -> Vec<u16> {
j.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect()
}
fn entry_action_states(j: &[TraceEvent]) -> Vec<u16> {
j.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state,
kind: ActionKind::Entry,
..
} => Some(*state),
_ => None,
})
.collect()
}
#[tokio::test(flavor = "current_thread")]
async fn det_initial_lands_on_composite_no_descent() {
// Standby has children but no `default` — initial entry stops at Standby.
// LowPower must NOT enter.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Microwave::new(Ctx);
// Drive initial entry without consuming an event.
let _ = m.step(hsmc::Duration::ZERO).await;
assert_eq!(
m.current_state(),
MicrowaveState::Standby,
"innermost active state is the composite Standby"
);
let j = m.take_journal();
let entered = entered_states(&j);
assert_eq!(
entered,
vec![SR, S_STANDBY],
"initial entry stops at Standby; no default-descent into LowPower"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_transition_into_substate_works() {
// Explicit `=> LowPower` from Standby enters LowPower.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Microwave::new(Ctx);
let _ = m.dispatch(Ev::EnterLowPower).await;
assert_eq!(m.current_state(), MicrowaveState::LowPower);
let j = m.take_journal();
// Standby entered first (initial), then LowPower entered after the event.
let entered = entered_states(&j);
assert_eq!(entered, vec![SR, S_STANDBY, S_LOW]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_from_substate_lands_on_composite() {
// From LowPower, `=> Standby` is an up-transition: exit LowPower, do not
// re-enter Standby.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Microwave::new(Ctx);
let _ = m.dispatch(Ev::EnterLowPower).await;
let _ = m.dispatch(Ev::LeaveLowPower).await;
assert_eq!(m.current_state(), MicrowaveState::Standby);
let j = m.take_journal();
// Across the whole run: enter Standby, enter LowPower, exit
// LowPower. Standby's entry must have run exactly once.
let entry_states = entry_action_states(&j);
let standby_entries = entry_states.iter().filter(|&&s| s == S_STANDBY).count();
assert_eq!(
standby_entries, 1,
"Standby's entry runs once; up-transition does not re-enter it"
);
let exited = exited_states(&j);
assert_eq!(
exited,
vec![S_LOW],
"only LowPower is exited; Standby remains on the active path"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_lateral_to_composite_does_not_descend() {
// From On, `=> Standby` lands on Standby — NOT on LowPower.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Microwave::new(Ctx);
let _ = m.dispatch(Ev::PowerOn).await;
assert_eq!(m.current_state(), MicrowaveState::On);
let _ = m.dispatch(Ev::PowerOff).await;
assert_eq!(
m.current_state(),
MicrowaveState::Standby,
"PowerOff lands on Standby; absence of `default` skips descent"
);
let j = m.take_journal();
// LowPower must never have been entered.
let entered = entered_states(&j);
assert!(
!entered.contains(&S_LOW),
"no descent into LowPower on entry to Standby"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_from_composite_unwinds_path() {
// Halt while at Standby exits Standby → Root only.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Microwave::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
let exits = exited_states(&j);
assert_eq!(
exits,
vec![S_STANDBY, SR],
"terminate from Standby exits Standby then Root"
);
assert!(matches!(j.last(), Some(TraceEvent::Terminated)));
})
.await;
}
hsmc/tests/det_ordering.rs
+331
View File
@@ -0,0 +1,331 @@
#![allow(dead_code)]
//! Deterministic-flow tests for ENTRY/EXIT ORDERING (declaration order, depth order).
//!
//! Spec section "Entry and exit ordering":
//! Entry runs outer-to-inner. Within a single state, entry actions fire in
//! declaration order. Exit runs inner-to-outer. Within a single state, exit
//! actions fire in declaration order.
//!
//! Spec: "If a single state has multiple handlers (actions and/or a transition)
//! for the same trigger, the actions fire in declaration order, then the
//! transition fires last."
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Go,
Multi,
Halt,
}
statechart! {
Ord {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
entry: r1, r2, r3;
exit: r_x1, r_x2;
state A {
entry: a1, a2;
exit: a_x1, a_x2, a_x3;
on(Go) => B;
on(Multi) => act1;
on(Multi) => act2;
on(Multi) => act3;
on(Multi) => B;
}
state B {
entry: b1;
exit: b_x1;
}
}
}
impl OrdActions for OrdActionContext<'_> {
async fn r1(&mut self) {}
async fn r2(&mut self) {}
async fn r3(&mut self) {}
async fn r_x1(&mut self) {}
async fn r_x2(&mut self) {}
async fn a1(&mut self) {}
async fn a2(&mut self) {}
async fn a_x1(&mut self) {}
async fn a_x2(&mut self) {}
async fn a_x3(&mut self) {}
async fn b1(&mut self) {}
async fn b_x1(&mut self) {}
async fn act1(&mut self) {}
async fn act2(&mut self) {}
async fn act3(&mut self) {}
}
const SR: u16 = 0;
const SA: u16 = 1;
const SB: u16 = 2;
// Action interning order from declaration:
// Root: r1=0, r2=1, r3=2 (entries), r_x1=3, r_x2=4 (exits)
// A: a1=5, a2=6, a_x1=7, a_x2=8, a_x3=9, then handlers act1=10, act2=11, act3=12
// B: b1=13, b_x1=14
const A_R1: u16 = 0;
const A_R2: u16 = 1;
const A_R3: u16 = 2;
const A_RX1: u16 = 3;
const A_RX2: u16 = 4;
const A_A1: u16 = 5;
const A_A2: u16 = 6;
const A_AX1: u16 = 7;
const A_AX2: u16 = 8;
const A_AX3: u16 = 9;
const A_ACT1: u16 = 10;
const A_ACT2: u16 = 11;
const A_ACT3: u16 = 12;
const A_B1: u16 = 13;
const A_BX1: u16 = 14;
#[tokio::test(flavor = "current_thread")]
async fn det_ord_root_entries_in_declaration_order() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
// Filter to root entry actions in journal order.
let r_entries: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state: SR,
action,
kind: ActionKind::Entry,
} => Some(*action),
_ => None,
})
.collect();
assert_eq!(r_entries, vec![A_R1, A_R2, A_R3]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_ord_root_exits_in_declaration_order() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let r_exits: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state: SR,
action,
kind: ActionKind::Exit,
} => Some(*action),
_ => None,
})
.collect();
assert_eq!(r_exits, vec![A_RX1, A_RX2]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_ord_state_a_entries_in_declaration_order() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let a_entries: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state: SA,
action,
kind: ActionKind::Entry,
} => Some(*action),
_ => None,
})
.collect();
assert_eq!(a_entries, vec![A_A1, A_A2]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_ord_state_a_exits_in_declaration_order() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let a_exits: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state: SA,
action,
kind: ActionKind::Exit,
} => Some(*action),
_ => None,
})
.collect();
assert_eq!(a_exits, vec![A_AX1, A_AX2, A_AX3]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_ord_entry_outer_then_inner_across_hierarchy() {
// Initial entry: Root → A. Root's entries fire first, then A's.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let entries_in_order: Vec<u16> = m
.journal()
.iter()
.take_while(|e| !matches!(e, TraceEvent::TerminateRequested { .. }))
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
action,
kind: ActionKind::Entry,
..
} => Some(*action),
_ => None,
})
.collect();
assert_eq!(entries_in_order, vec![A_R1, A_R2, A_R3, A_A1, A_A2]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_ord_exit_inner_then_outer_across_hierarchy() {
// On terminate: A's exits then Root's exits.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let exits_in_order: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
action,
kind: ActionKind::Exit,
..
} => Some(*action),
_ => None,
})
.collect();
assert_eq!(exits_in_order, vec![A_AX1, A_AX2, A_AX3, A_RX1, A_RX2]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_ord_actions_then_transition_on_same_trigger() {
// Multi: act1, act2, act3 fire in declaration order, then transition to B.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Multi).await;
let j = m.take_journal();
// Find the action invocations and the TransitionFired in order.
let after_delivered: Vec<&TraceEvent> = j
.iter()
.skip_while(|e| !matches!(e, TraceEvent::EventDelivered { event: 1, .. }))
// Multi is the second event: Go=0, Multi=1.
.skip(1)
.take(20)
.collect();
// First three should be Handler actions in order act1, act2, act3.
let handler_actions: Vec<u16> = after_delivered
.iter()
.take_while(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
kind: ActionKind::Handler,
..
}
)
})
.filter_map(|e| match e {
TraceEvent::ActionInvoked { action, .. } => Some(*action),
_ => None,
})
.collect();
assert_eq!(
handler_actions,
vec![A_ACT1, A_ACT2, A_ACT3],
"actions in declaration order"
);
// After the actions, a TransitionFired must follow.
let trans_idx = after_delivered
.iter()
.position(|e| matches!(e, TraceEvent::TransitionFired { .. }))
.unwrap();
assert_eq!(trans_idx, 3, "transition fires after the 3 actions");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_ord_full_transition_canonical_sequence() {
// Spec: cancel durings → run exits inner→outer → run entries outer→inner → start durings.
// No durings here, so just exits inner→outer + entries outer→inner.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Ord::new(Ctx);
let _ = m.dispatch(Ev::Go).await;
let j = m.take_journal();
// Find the EVENT-driven TransitionFired (initial default-fires
// are TransitionFired{Internal}; we want the GO transition).
let trans_idx = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::TransitionFired {
reason: TransitionReason::Event { .. },
..
}
)
})
.unwrap();
let kinds: Vec<ActionKind> = j[trans_idx..]
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked { kind, .. } => Some(*kind),
_ => None,
})
.collect();
// First A's exit kinds (inner-to-outer order — A is innermost), then B's entry kinds.
let exit_count = kinds.iter().filter(|k| **k == ActionKind::Exit).count();
let entry_count = kinds.iter().filter(|k| **k == ActionKind::Entry).count();
assert_eq!(exit_count, 3, "A has 3 exit actions");
assert_eq!(entry_count, 1, "B has 1 entry action");
// Exits before entries.
let first_entry = kinds.iter().position(|k| *k == ActionKind::Entry).unwrap();
let last_exit = kinds.iter().rposition(|k| *k == ActionKind::Exit).unwrap();
assert!(
last_exit < first_entry,
"all exits must precede all entries in a transition"
);
})
.await;
}
hsmc/tests/det_root_target.rs
+224
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@@ -0,0 +1,224 @@
#![allow(dead_code)]
//! Pins down that the ROOT state is targetable by the chart's own name.
//!
//! Spec section "What a chart contains":
//! State — a named node. The root state (the machine itself) is just a
//! state. Every state is just a state.
//!
//! Spec section "How transitions work":
//! The target can be any state in the entire chart. ... state names must
//! be unique across the chart.
//!
//! From these two together: `on(Trig) => <ChartName>;` is a valid transition
//! whose target is the root. From a leaf, this is an up-transition; from any
//! state inside the chart it's an up-transition (root is always on the active
//! path) — exiting only the states strictly between current and root.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
UpToRoot,
Halt,
}
statechart! {
Sub {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
entry: r_in;
exit: r_out;
state A {
entry: a_in;
exit: a_out;
default(B);
state B {
entry: b_in;
exit: b_out;
on(UpToRoot) => Sub; // ← target is the chart name = root
}
}
}
}
impl SubActions for SubActionContext<'_> {
async fn r_in(&mut self) {}
async fn r_out(&mut self) {}
async fn a_in(&mut self) {}
async fn a_out(&mut self) {}
async fn b_in(&mut self) {}
async fn b_out(&mut self) {}
}
const SR: u16 = 0;
const SA: u16 = 1;
const SB: u16 = 2;
const A_R_IN: u16 = 0;
const A_R_OUT: u16 = 1;
const A_A_IN: u16 = 2;
const A_A_OUT: u16 = 3;
const A_B_IN: u16 = 4;
const A_B_OUT: u16 = 5;
const E_UPTOROOT: u16 = 0;
fn entry(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Entry,
}
}
fn exit_(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Exit,
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_root_targetable_by_chart_name() {
// Chart compiles. Targeting root by chart name resolves correctly.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Sub::new(Ctx);
let _ = m.dispatch(Ev::UpToRoot).await;
let actual = m.take_journal();
// Up-transition to root from B: exit B and A. Root is target,
// not exited, not re-entered, no default-descent.
let expected = vec![
TraceEvent::Started {
chart_hash: Sub::<8>::CHART_HASH,
},
TraceEvent::EnterBegan { state: SR },
entry(SR, A_R_IN),
TraceEvent::Entered { state: SR },
// Root's `default(A)` fires.
TraceEvent::TransitionFired {
from: Some(SR),
to: SA,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SA },
entry(SA, A_A_IN),
TraceEvent::Entered { state: SA },
TraceEvent::TransitionComplete {
from: Some(SR),
to: SA,
},
// A's `default(B)` fires.
TraceEvent::TransitionFired {
from: Some(SA),
to: SB,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SB },
entry(SB, A_B_IN),
TraceEvent::Entered { state: SB },
TraceEvent::TransitionComplete {
from: Some(SA),
to: SB,
},
TraceEvent::EventReceived { event: E_UPTOROOT },
TraceEvent::EventDelivered {
handler_state: SB,
event: E_UPTOROOT,
},
TraceEvent::TransitionFired {
from: Some(SB),
to: SR,
reason: TransitionReason::Event { event: E_UPTOROOT },
},
TraceEvent::ExitBegan { state: SB },
exit_(SB, A_B_OUT),
TraceEvent::Exited { state: SB },
TraceEvent::ExitBegan { state: SA },
exit_(SA, A_A_OUT),
TraceEvent::Exited { state: SA },
TraceEvent::TransitionComplete {
from: Some(SB),
to: SR,
},
];
assert_eq!(
actual, expected,
"root targetable; up-transition to root exits A and B only"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_root_target_does_not_re_enter_root() {
// After the up-to-root, root must NOT have re-entered.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Sub::new(Ctx);
let _ = m.dispatch(Ev::UpToRoot).await;
let j = m.take_journal();
// After the EVENT-driven TransitionFired (the UpToRoot one),
// no Entered event should fire — the up-transition exits B
// and A but never re-enters root, and root has no default
// (so no internal default-fire follows either).
let split = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::TransitionFired {
reason: TransitionReason::Event { .. },
..
}
)
})
.unwrap();
let entered_after = j[split..]
.iter()
.filter(|e| matches!(e, TraceEvent::Entered { .. }))
.count();
assert_eq!(
entered_after, 0,
"up-to-root must not re-enter root or default-descend"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_root_target_then_terminate() {
// After up-to-root, root is the innermost active state. Terminate exits root only.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Sub::new(Ctx);
let _ = m.dispatch(Ev::UpToRoot).await;
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
// After UpToRoot we're in root only. Halt exits root only.
let exits: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(
exits,
vec![SB, SA, SR],
"up-to-root exits B, A; terminate exits root"
);
assert!(matches!(j.last(), Some(TraceEvent::Terminated)));
})
.await;
}
hsmc/tests/det_self.rs
+360
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@@ -0,0 +1,360 @@
#![allow(dead_code)]
//! Deterministic-flow tests for SELF-TRANSITIONS.
//!
//! Spec section "Transitioning to yourself":
//! The standard transition algorithm gives the clean answer: the LCA of the
//! target with itself is its parent, so we exit only the target and re-enter
//! only the target. Nothing above the target is exited or re-entered.
//!
//! Concrete example given in spec: in `Root → SomeState → SomeOtherState`,
//! a transition (Trig) => SomeOtherState exits and re-enters ONLY
//! SomeOtherState; SomeState is never touched.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
SelfLeaf,
SelfMid,
Halt,
}
// Hierarchy: Root → Mid → Leaf
// Self-transitions: SelfLeaf targets Leaf; SelfMid targets Mid.
statechart! {
Self_ {
context: Ctx;
events: Ev;
default(Mid);
terminate(Halt);
state Mid {
entry: m_in;
exit: m_out;
default(Leaf);
on(SelfMid) => Mid;
state Leaf {
entry: l_in;
exit: l_out;
on(SelfLeaf) => Leaf;
}
}
}
}
impl Self_Actions for Self_ActionContext<'_> {
async fn m_in(&mut self) {}
async fn m_out(&mut self) {}
async fn l_in(&mut self) {}
async fn l_out(&mut self) {}
}
const SR: u16 = 0;
const SM: u16 = 1;
const SL: u16 = 2;
const A_M_IN: u16 = 0;
const A_M_OUT: u16 = 1;
const A_L_IN: u16 = 2;
const A_L_OUT: u16 = 3;
// Event interning order: handlers on the parent (Mid) are processed before
// recursing into children (Leaf), so SelfMid is interned first.
const E_SELFMID: u16 = 0;
const E_SELFLEAF: u16 = 1;
fn entry(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Entry,
}
}
fn exit_(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Exit,
}
}
fn initial_descent() -> Vec<TraceEvent> {
vec![
TraceEvent::Started {
chart_hash: Self_::<8>::CHART_HASH,
},
TraceEvent::EnterBegan { state: SR },
TraceEvent::Entered { state: SR },
TraceEvent::TransitionFired {
from: Some(SR),
to: SM,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SM },
entry(SM, A_M_IN),
TraceEvent::Entered { state: SM },
TraceEvent::TransitionComplete {
from: Some(SR),
to: SM,
},
TraceEvent::TransitionFired {
from: Some(SM),
to: SL,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SL },
entry(SL, A_L_IN),
TraceEvent::Entered { state: SL },
TraceEvent::TransitionComplete {
from: Some(SM),
to: SL,
},
]
}
fn assert_journal(actual: &[TraceEvent], expected: &[TraceEvent]) {
let mismatch = actual.iter().zip(expected.iter()).position(|(a, e)| a != e);
if let Some(i) = mismatch {
panic!(
"mismatch at index {}\n actual: {:?}\n expected: {:?}",
i,
actual.get(i),
expected.get(i)
);
}
assert_eq!(
actual.len(),
expected.len(),
"length mismatch: actual {} vs expected {}",
actual.len(),
expected.len()
);
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_leaf_exits_and_reenters_only_leaf() {
// Spec: nothing above the target is touched.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Self_::new(Ctx);
let _ = m.dispatch(Ev::SelfLeaf).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_SELFLEAF },
TraceEvent::EventDelivered {
handler_state: SL,
event: E_SELFLEAF,
},
TraceEvent::TransitionFired {
from: Some(SL),
to: SL,
reason: TransitionReason::Event { event: E_SELFLEAF },
},
TraceEvent::ExitBegan { state: SL },
exit_(SL, A_L_OUT),
TraceEvent::Exited { state: SL },
TraceEvent::EnterBegan { state: SL },
entry(SL, A_L_IN),
TraceEvent::Entered { state: SL },
TraceEvent::TransitionComplete {
from: Some(SL),
to: SL,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_leaf_does_not_touch_parent() {
// The key spec example. Mid must NOT appear in any Exited or Entered
// event after the initial descent.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Self_::new(Ctx);
let _ = m.dispatch(Ev::SelfLeaf).await;
let j = m.take_journal();
// Find the index of the EventDelivered for SelfLeaf — everything
// after that is the self-transition body.
let split = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::EventDelivered {
event: E_SELFLEAF,
..
}
)
})
.unwrap();
let parent_after = j[split..]
.iter()
.filter(|e| {
matches!(
e,
TraceEvent::Entered { state: SM } | TraceEvent::Exited { state: SM }
)
})
.count();
assert_eq!(parent_after, 0,
"Mid must not be exited or re-entered during self-transition on Leaf; got tail: {:?}",
&j[split..]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_composite_default_descends() {
// Spec: "If the target happens to be a composite ... the same default-child
// rule still applies on re-entry: exit the composite, re-enter it, then
// descend through its default chain to a leaf."
//
// Currently in Mid via Leaf default. SelfMid bubbles from Leaf to Mid (Mid
// has the handler). At dispatch time, innermost is Leaf, so Mid is not
// the innermost — that makes it an UP-then-self situation. Actually the
// transition algorithm classifies it: target=Mid, current=Leaf, target IS
// on the active path and target ≠ I, so this is an UP-transition not a
// self-transition. Let's verify what the journal records.
//
// (See det_up.rs for explicit up-transition tests; this test pins the
// bubbling behavior when the handler is on Mid but the transition is to
// Mid itself from Leaf.)
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Self_::new(Ctx);
let _ = m.dispatch(Ev::SelfMid).await;
let actual = m.take_journal();
// Per spec rules: target=Mid is ON the active path (Root→Mid→Leaf),
// and target ≠ Leaf. So it's an UP-transition: only Leaf exits.
// Mid's entry actions don't fire. No default-descent.
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_SELFMID },
TraceEvent::EventDelivered {
handler_state: SM,
event: E_SELFMID,
},
TraceEvent::TransitionFired {
from: Some(SL),
to: SM,
reason: TransitionReason::Event { event: E_SELFMID },
},
TraceEvent::ExitBegan { state: SL },
exit_(SL, A_L_OUT),
TraceEvent::Exited { state: SL },
TraceEvent::TransitionComplete {
from: Some(SL),
to: SM,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_leaf_repeated_is_deterministic() {
// Multiple self-transitions: each independently records the same pattern.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Self_::new(Ctx);
let _ = m.dispatch(Ev::SelfLeaf).await;
let _ = m.dispatch(Ev::SelfLeaf).await;
let _ = m.dispatch(Ev::SelfLeaf).await;
let j = m.take_journal();
// Three EventDelivered for SelfLeaf, three TransitionFired, three of each
// exit/entry pair.
let delivered = j
.iter()
.filter(|e| {
matches!(
e,
TraceEvent::EventDelivered {
event: E_SELFLEAF,
..
}
)
})
.count();
assert_eq!(delivered, 3);
let trans = j
.iter()
.filter(|e| {
matches!(
e,
TraceEvent::TransitionFired {
from: Some(SL),
to: SL,
..
}
)
})
.count();
assert_eq!(trans, 3);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_byte_deterministic_across_runs() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Self_::new(Ctx);
let _ = m.dispatch(Ev::SelfLeaf).await;
let _ = m.dispatch(Ev::SelfLeaf).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "run {i} diverged");
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_action_kinds_are_exit_then_entry() {
// Spec: "cancel durings, run exits, run entries, start durings".
// No durings on this chart, so we expect: Exit kind action, then Entry kind action.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Self_::new(Ctx);
let _ = m.dispatch(Ev::SelfLeaf).await;
let j = m.take_journal();
let split = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::EventDelivered {
event: E_SELFLEAF,
..
}
)
})
.unwrap();
let kinds_after: Vec<ActionKind> = j[split..]
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked { kind, .. } => Some(*kind),
_ => None,
})
.collect();
assert_eq!(
kinds_after,
vec![ActionKind::Exit, ActionKind::Entry],
"self-transition: exit before entry"
);
})
.await;
}
hsmc/tests/det_self_composite.rs
+181
View File
@@ -0,0 +1,181 @@
#![allow(dead_code)]
//! Deterministic-flow tests for SELF-TRANSITION on a composite (re-enters with default-descend).
//!
//! Spec section "Transitioning to yourself":
//! If the target happens to be a composite (it has children, but no child is
//! active right now because you got there via an up-transition), the same
//! default-child rule still applies on re-entry: exit the composite,
//! re-enter it, then descend through its default chain to a leaf.
//!
//! To get a composite as the innermost active state, this chart uses:
//! 1. UpToParent (D → Parent) → Parent is now innermost composite.
//! 2. SelfMid (Parent → Parent) → exit Parent, re-enter Parent, default-descend.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
UpToParent, // D → Parent (up-transition)
SelfParent, // Parent → Parent (self-transition on composite)
Halt,
}
statechart! {
Sc {
context: Ctx;
events: Ev;
default(Parent);
terminate(Halt);
state Parent {
entry: p_in;
exit: p_out;
default(Child);
on(SelfParent) => Parent;
state Child {
entry: c_in;
exit: c_out;
default(Leaf);
state Leaf {
entry: l_in;
exit: l_out;
on(UpToParent) => Parent;
}
}
}
}
}
impl ScActions for ScActionContext<'_> {
async fn p_in(&mut self) {}
async fn p_out(&mut self) {}
async fn c_in(&mut self) {}
async fn c_out(&mut self) {}
async fn l_in(&mut self) {}
async fn l_out(&mut self) {}
}
const SR: u16 = 0;
const SP: u16 = 1;
const SC: u16 = 2;
const SL: u16 = 3;
#[tokio::test(flavor = "current_thread")]
async fn det_self_composite_default_descends_after_re_entry() {
// Path: initial → Leaf. UpToParent → Parent (up). SelfParent → exit Parent,
// re-enter Parent, default-descend (Parent → Child → Leaf).
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Sc::new(Ctx);
let _ = m.dispatch(Ev::UpToParent).await;
let _ = m.dispatch(Ev::SelfParent).await;
let j = m.take_journal();
// After SelfParent, expect: exit Parent → re-enter Parent → enter Child → enter Leaf.
let self_idx = j
.iter()
.rposition(|e| {
matches!(
e,
TraceEvent::TransitionFired {
from: Some(SP),
to: SP,
..
}
)
})
.unwrap();
let after = &j[self_idx..];
let exits: Vec<u16> = after
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
let entered: Vec<u16> = after
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(exits, vec![SP], "self-transition exits target only");
assert_eq!(
entered,
vec![SP, SC, SL],
"re-enter target then default-descend"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_composite_action_kinds_in_order() {
// After the SelfParent transition: Exit p_out, Entry p_in, Entry c_in, Entry l_in.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Sc::new(Ctx);
let _ = m.dispatch(Ev::UpToParent).await;
let _ = m.dispatch(Ev::SelfParent).await;
let j = m.take_journal();
let self_idx = j
.iter()
.rposition(|e| {
matches!(
e,
TraceEvent::TransitionFired {
from: Some(SP),
to: SP,
..
}
)
})
.unwrap();
let kinds: Vec<ActionKind> = j[self_idx..]
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked { kind, .. } => Some(*kind),
_ => None,
})
.collect();
assert_eq!(
kinds,
vec![
ActionKind::Exit,
ActionKind::Entry,
ActionKind::Entry,
ActionKind::Entry
],
"exit Parent, then enter Parent, Child, Leaf"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_self_composite_byte_deterministic() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Sc::new(Ctx);
let _ = m.dispatch(Ev::UpToParent).await;
let _ = m.dispatch(Ev::SelfParent).await;
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
hsmc/tests/det_step_dispatch.rs
+147
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#![allow(dead_code)]
//! Deterministic-flow tests for `step()` vs `dispatch()` equivalence.
//!
//! Spec section "step() vs run() vs dispatch()":
//! For the same external event sequence and the same elapsed-time inputs,
//! the three produce the same observable trace.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Tick,
Halt,
}
statechart! {
Eq {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
state A {
entry: a_in;
exit: a_out;
on(Tick) => B;
}
state B {
entry: b_in;
exit: b_out;
on(Tick) => A;
}
}
}
impl EqActions for EqActionContext<'_> {
async fn a_in(&mut self) {}
async fn a_out(&mut self) {}
async fn b_in(&mut self) {}
async fn b_out(&mut self) {}
}
#[tokio::test(flavor = "current_thread")]
async fn det_dispatch_drains_to_quiescence() {
// dispatch(ev) processes ev plus any events emitted while handling ev.
// After the await returns, the queue is empty.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Eq::new(Ctx);
let _ = m.dispatch(Ev::Tick).await;
assert!(!m.has_pending_events());
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_step_and_dispatch_produce_same_journal() {
// Drive one machine via dispatch, another via send + step until queue empty.
// The journals must match.
tokio::task::LocalSet::new()
.run_until(async {
// Path 1: dispatch.
let mut m1 = Eq::new(Ctx);
let _ = m1.dispatch(Ev::Tick).await;
let _ = m1.dispatch(Ev::Tick).await;
let _ = m1.dispatch(Ev::Halt).await;
let j_dispatch = m1.take_journal();
// Path 2: send + step.
let mut m2 = Eq::new(Ctx);
m2.send(Ev::Tick).unwrap();
m2.send(Ev::Tick).unwrap();
m2.send(Ev::Halt).unwrap();
// Drive to quiescence with explicit steps.
for _ in 0..20 {
let _ = m2.step(::hsmc::Duration::ZERO).await;
if m2.is_terminated() {
break;
}
}
let j_step = m2.take_journal();
assert_eq!(
j_dispatch, j_step,
"step and dispatch must produce identical journals for the same event sequence"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_step_is_at_most_one_unit_of_work() {
// Each step() processes at most one event or one timer.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Eq::new(Ctx);
m.send(Ev::Tick).unwrap();
m.send(Ev::Tick).unwrap();
m.send(Ev::Halt).unwrap();
// After the first step (initial enter): chart enters root → A.
let _ = m.step(::hsmc::Duration::ZERO).await;
// After the second step: process Tick #1 (A → B).
let len_after_2 = {
let _ = m.step(::hsmc::Duration::ZERO).await;
m.journal().len()
};
// After the third step: process Tick #2 (B → A).
let _ = m.step(::hsmc::Duration::ZERO).await;
let len_after_3 = m.journal().len();
assert!(
len_after_3 > len_after_2,
"step processes additional events"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_step_repeated_idempotent_when_queue_empty() {
// Once initial-enter is done and queue is empty, additional steps
// (with elapsed=ZERO) are no-ops.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Eq::new(Ctx);
let _ = m.step(::hsmc::Duration::ZERO).await; // initial entry
let len_after_first = m.journal().len();
for _ in 0..10 {
let _ = m.step(::hsmc::Duration::ZERO).await;
}
// After the first step, no events are pending, so additional
// step(ZERO) calls do nothing.
assert_eq!(
m.journal().len(),
len_after_first,
"step(ZERO) on empty queue must not change journal"
);
})
.await;
}
hsmc/tests/det_termination.rs
+219
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#![allow(dead_code)]
//! Deterministic-flow tests for TERMINATION.
//!
//! Spec section "Termination":
//! When a `terminate` event is received, the machine exits the entire active
//! path bottom-up: innermost first, then each parent, up to and including
//! the root. After that, the machine is done — `is_terminated()` is true,
//! `run()` returns `Ok(())`, further `step()` calls are no-ops returning
//! `None`. Any pending events in the queue are dropped. Any in-flight
//! durings are dropped at their next `.await`.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, HsmcError, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Halt,
Other,
}
statechart! {
Term {
context: Ctx;
events: Ev;
default(Mid);
terminate(Halt);
entry: r_in;
exit: r_out;
state Mid {
entry: m_in;
exit: m_out;
default(Leaf);
on(Other) => log_other;
state Leaf {
entry: l_in;
exit: l_out;
}
}
}
}
impl TermActions for TermActionContext<'_> {
async fn r_in(&mut self) {}
async fn r_out(&mut self) {}
async fn m_in(&mut self) {}
async fn m_out(&mut self) {}
async fn l_in(&mut self) {}
async fn l_out(&mut self) {}
async fn log_other(&mut self) {}
}
const SR: u16 = 0;
const SM: u16 = 1;
const SL: u16 = 2;
// Halt is interned via terminate(Halt). Other is used in `on(Other)` first.
// IR build order: handlers processed first per body. Mid has on(Other) → 0.
// Then Halt is interned at the end of build_ir → 1.
const E_OTHER: u16 = 0;
const E_HALT: u16 = 1;
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_records_terminate_requested() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
// TerminateRequested fires before the bottom-up exits.
let req_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::TerminateRequested { event: E_HALT }));
assert!(
req_idx.is_some(),
"TerminateRequested must appear, got: {:?}",
j
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_exits_bottom_up() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let exits: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(exits, vec![SL, SM, SR], "termination exits inner-to-outer");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_terminated_is_last() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
assert!(matches!(m.journal().last(), Some(TraceEvent::Terminated)));
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_dispatch_after_returns_already_terminated() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let res = m.dispatch(Ev::Other).await;
assert!(
matches!(res, Err(HsmcError::AlreadyTerminated)),
"dispatch after terminate must return AlreadyTerminated, got {:?}",
res
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_journal_unchanged_by_post_term_dispatch() {
// Calling dispatch after terminate must not journal anything new.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let len_before = m.journal().len();
let _ = m.dispatch(Ev::Other).await;
let len_after = m.journal().len();
assert_eq!(
len_before, len_after,
"journal length must not change after termination"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_exit_actions_run_in_order() {
// Spec: exit actions inner-to-outer.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let exit_actions: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked {
state,
kind: ActionKind::Exit,
..
} => Some(*state),
_ => None,
})
.collect();
assert_eq!(exit_actions, vec![SL, SM, SR]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_other_event_processed_before_halt() {
// Other is dispatched first, then Halt. Other is delivered, then Halt
// triggers termination. EventDelivered for Other appears, but no
// EventDelivered for Halt — instead, TerminateRequested.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Other).await;
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
let other_delivered = j
.iter()
.any(|e| matches!(e, TraceEvent::EventDelivered { event: E_OTHER, .. }));
let halt_delivered = j
.iter()
.any(|e| matches!(e, TraceEvent::EventDelivered { event: E_HALT, .. }));
let halt_requested = j
.iter()
.any(|e| matches!(e, TraceEvent::TerminateRequested { event: E_HALT }));
assert!(other_delivered, "Other must be delivered");
assert!(!halt_delivered, "Halt does not go through EventDelivered");
assert!(halt_requested, "Halt goes through TerminateRequested");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_terminate_byte_deterministic() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Term::new(Ctx);
let _ = m.dispatch(Ev::Other).await;
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
hsmc/tests/det_timers.rs
+301
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#![allow(dead_code)]
//! Deterministic-flow tests for TIMERS.
//!
//! Spec section "Timers":
//! - A timer starts when its state is entered.
//! - A timer is cancelled when its state is exited.
//! - Descending into a child state is not an exit — parent's timers keep running.
//! - Timers don't bubble. Only the declaring state handles its expiry.
//! - Re-entering a state restarts its timers.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use core::time::Duration;
use hsmc::{statechart, ActionKind, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Stop,
Halt,
}
statechart! {
Tim {
context: Ctx;
events: Ev;
default(Counting);
terminate(Halt);
state Counting {
entry: c_in;
exit: c_out;
on(after Duration::from_millis(50)) => Done;
on(Stop) => Done;
}
state Done {
entry: d_in;
on(after Duration::from_millis(20)) => log_tick;
}
}
}
impl TimActions for TimActionContext<'_> {
async fn c_in(&mut self) {}
async fn c_out(&mut self) {}
async fn d_in(&mut self) {}
async fn log_tick(&mut self) {}
}
const SR: u16 = 0;
const SC: u16 = 1;
const SD: u16 = 2;
// Timer ids in first-seen order: 50ms (counting) → 0, 20ms (done) → 1.
const T_COUNTING: u16 = 0;
const T_DONE: u16 = 1;
fn timer_events(j: &[TraceEvent]) -> Vec<&TraceEvent> {
j.iter()
.filter(|e| {
matches!(
e,
TraceEvent::TimerArmed { .. }
| TraceEvent::TimerCancelled { .. }
| TraceEvent::TimerFired { .. }
)
})
.collect()
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_arms_on_entry() {
// Spec: timer starts when its state is entered.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Stop).await;
let j = m.take_journal();
// First TimerArmed must be Counting's 50ms timer.
let first_armed = j
.iter()
.find(|e| matches!(e, TraceEvent::TimerArmed { .. }));
assert!(
matches!(
first_armed,
Some(TraceEvent::TimerArmed {
state: SC,
timer: T_COUNTING,
ns: 50_000_000
})
),
"got: {:?}",
first_armed
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_cancels_on_exit() {
// Spec: timer is cancelled when its state is exited.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Stop).await;
let j = m.take_journal();
// Stop transitions Counting → Done. Exit Counting must cancel its timer.
let cancelled = j.iter().find(|e| {
matches!(
e,
TraceEvent::TimerCancelled {
state: SC,
timer: T_COUNTING
}
)
});
assert!(
cancelled.is_some(),
"Counting's timer must be cancelled on exit, got: {:?}",
j
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_cancel_appears_before_exit_actions() {
// Spec: "1. cancel durings 2. cancel timers 3. exit actions 4. Exited"
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Stop).await;
let j = m.take_journal();
let cancel_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::TimerCancelled { state: SC, .. }))
.unwrap();
let exit_action_idx = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
state: SC,
kind: ActionKind::Exit,
..
}
)
})
.unwrap();
assert!(
cancel_idx < exit_action_idx,
"TimerCancelled at {} must precede ActionInvoked Exit at {}",
cancel_idx,
exit_action_idx
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_arm_appears_after_entry_actions() {
// The TimerArmed must come AFTER the entry action invocation.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Stop).await;
let j = m.take_journal();
// First Entry-kind action on Counting:
let entry_idx = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
state: SC,
kind: ActionKind::Entry,
..
}
)
})
.unwrap();
// First TimerArmed for Counting:
let armed_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::TimerArmed { state: SC, .. }))
.unwrap();
assert!(
entry_idx < armed_idx,
"entry actions ({}) must fire before TimerArmed ({})",
entry_idx,
armed_idx
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_arm_each_state_in_path() {
// Initial descent into Counting arms Counting's timer.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let armed: Vec<&TraceEvent> = m
.journal()
.iter()
.filter(|e| matches!(e, TraceEvent::TimerArmed { .. }))
.collect();
// Only Counting has a timer in initial descent (Done is unreached).
assert_eq!(
armed.len(),
1,
"expected 1 TimerArmed during initial descent, got {:?}",
armed
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_two_lifecycles_arm_then_cancel_each() {
// GoChild then UpToCounting (no such event — use Stop for full exit).
// Just check Stop's full sequence: arm → cancel.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Stop).await;
let evs = timer_events(m.journal());
assert_eq!(
evs.len(),
3,
"expected arm → cancel → arm (Done's timer), got {:?}",
evs
);
assert!(matches!(
evs[0],
TraceEvent::TimerArmed {
state: SC,
timer: T_COUNTING,
ns: 50_000_000
}
));
assert!(matches!(
evs[1],
TraceEvent::TimerCancelled {
state: SC,
timer: T_COUNTING
}
));
assert!(matches!(
evs[2],
TraceEvent::TimerArmed {
state: SD,
timer: T_DONE,
ns: 20_000_000
}
));
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_byte_deterministic() {
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Stop).await;
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
assert_eq!(first, run().await, "diverged on run {i}");
}
}
#[tokio::test(flavor = "current_thread")]
async fn det_timer_state_cancel_uses_correct_state_id() {
// The TimerCancelled.state must be SC, not SR or any other.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Tim::new(Ctx);
let _ = m.dispatch(Ev::Stop).await;
let cancels: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::TimerCancelled { state, .. } => Some(*state),
_ => None,
})
.collect();
assert_eq!(cancels, vec![SC]);
})
.await;
}
hsmc/tests/det_timers_parent.rs
+135
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@@ -0,0 +1,135 @@
#![allow(dead_code)]
//! Deterministic-flow tests for parent-vs-child timer interaction.
//!
//! Spec: "Descending into a child state is not an exit — the parent's
//! timers keep running."
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use core::time::Duration;
use hsmc::{statechart, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Halt,
}
// Parent has a 100ms timer. Default-descend into ChildA. ChildA has no timer.
statechart! {
Pt {
context: Ctx;
events: Ev;
default(Parent);
terminate(Halt);
state Parent {
entry: p_in;
exit: p_out;
default(ChildA);
on(after Duration::from_millis(100)) => Done;
state ChildA {
entry: ca_in;
exit: ca_out;
}
}
state Done {
entry: d_in;
}
}
}
impl PtActions for PtActionContext<'_> {
async fn p_in(&mut self) {}
async fn p_out(&mut self) {}
async fn ca_in(&mut self) {}
async fn ca_out(&mut self) {}
async fn d_in(&mut self) {}
}
const SP: u16 = 1;
const T_PARENT: u16 = 0;
#[tokio::test(flavor = "current_thread")]
async fn det_parent_timer_armed_before_child_entered() {
// Parent's timer arms during Parent's entry; THEN default-descends into ChildA.
// So the order is: TimerArmed(Parent) before Entered(ChildA).
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Pt::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
let armed_idx = j
.iter()
.position(|e| matches!(e, TraceEvent::TimerArmed { state: SP, .. }))
.unwrap();
let child_entered_idx = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::Entered { state: 2 } // ChildA = id 2
)
})
.unwrap();
assert!(
armed_idx < child_entered_idx,
"TimerArmed (Parent) at {} must precede Entered (ChildA) at {}",
armed_idx,
child_entered_idx
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_parent_timer_only_one_arm_in_initial_descent() {
// Only Parent has a timer. ChildA has none.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Pt::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let armed: Vec<u16> = m
.journal()
.iter()
.filter_map(|e| match e {
TraceEvent::TimerArmed { state, .. } => Some(*state),
_ => None,
})
.collect();
assert_eq!(armed, vec![SP]);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_parent_timer_cancelled_on_termination() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Pt::new(Ctx);
let _ = m.dispatch(Ev::Halt).await;
let cancels: Vec<&TraceEvent> = m
.journal()
.iter()
.filter(|e| matches!(e, TraceEvent::TimerCancelled { .. }))
.collect();
// Termination unwinds all states. Parent's timer is cancelled when Parent exits.
assert_eq!(
cancels.len(),
1,
"expected exactly 1 TimerCancelled (Parent's), got {:?}",
cancels
);
assert!(matches!(
cancels[0],
TraceEvent::TimerCancelled {
state: SP,
timer: T_PARENT
}
));
})
.await;
}
hsmc/tests/det_up.rs
+451
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@@ -0,0 +1,451 @@
#![allow(dead_code)]
//! Deterministic-flow tests for UP-TRANSITIONS (target is on active path, target ≠ I).
//!
//! Spec section "Transitioning to one of your parents (the important one)":
//! When you transition to an ancestor of the current state, you exit the
//! current state and any states between, but you do NOT re-enter the
//! ancestor. ... You cannot enter a state you never left.
//!
//! Spec invariants for up-transitions:
//! - The ancestor's entry actions don't fire.
//! - The ancestor's `default` is not followed.
//! - The ancestor's timers don't restart.
//! - The ancestor's durings keep running.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
UpToA,
UpToB,
UpToC,
Halt,
}
// Hierarchy: Root → A → B → C → D
// Up-transitions on D and intermediate states fire to ancestors.
statechart! {
Up {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
entry: r_in;
exit: r_out;
state A {
entry: a_in;
exit: a_out;
default(B);
state B {
entry: b_in;
exit: b_out;
default(C);
state C {
entry: c_in;
exit: c_out;
default(D);
state D {
entry: d_in;
exit: d_out;
on(UpToA) => A;
on(UpToB) => B;
on(UpToC) => C;
}
}
}
}
}
}
impl UpActions for UpActionContext<'_> {
async fn r_in(&mut self) {}
async fn r_out(&mut self) {}
async fn a_in(&mut self) {}
async fn a_out(&mut self) {}
async fn b_in(&mut self) {}
async fn b_out(&mut self) {}
async fn c_in(&mut self) {}
async fn c_out(&mut self) {}
async fn d_in(&mut self) {}
async fn d_out(&mut self) {}
}
const SR: u16 = 0;
const SA: u16 = 1;
const SB: u16 = 2;
const SC: u16 = 3;
const SD: u16 = 4;
const A_R_IN: u16 = 0;
const A_R_OUT: u16 = 1;
const A_A_IN: u16 = 2;
const A_A_OUT: u16 = 3;
const A_B_IN: u16 = 4;
const A_B_OUT: u16 = 5;
const A_C_IN: u16 = 6;
const A_C_OUT: u16 = 7;
const A_D_IN: u16 = 8;
const A_D_OUT: u16 = 9;
// Event ids in first-seen order during IR build (D's handlers, in declaration order).
const E_UPTOA: u16 = 0;
const E_UPTOB: u16 = 1;
const E_UPTOC: u16 = 2;
fn entry(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Entry,
}
}
fn exit_(state: u16, action: u16) -> TraceEvent {
TraceEvent::ActionInvoked {
state,
action,
kind: ActionKind::Exit,
}
}
fn initial_descent() -> Vec<TraceEvent> {
// Each `default(...)` fires as a TransitionFired{Internal} /
// TransitionComplete pair around the entered state.
vec![
TraceEvent::Started {
chart_hash: Up::<8>::CHART_HASH,
},
TraceEvent::EnterBegan { state: SR },
entry(SR, A_R_IN),
TraceEvent::Entered { state: SR },
TraceEvent::TransitionFired {
from: Some(SR),
to: SA,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SA },
entry(SA, A_A_IN),
TraceEvent::Entered { state: SA },
TraceEvent::TransitionComplete {
from: Some(SR),
to: SA,
},
TraceEvent::TransitionFired {
from: Some(SA),
to: SB,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SB },
entry(SB, A_B_IN),
TraceEvent::Entered { state: SB },
TraceEvent::TransitionComplete {
from: Some(SA),
to: SB,
},
TraceEvent::TransitionFired {
from: Some(SB),
to: SC,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SC },
entry(SC, A_C_IN),
TraceEvent::Entered { state: SC },
TraceEvent::TransitionComplete {
from: Some(SB),
to: SC,
},
TraceEvent::TransitionFired {
from: Some(SC),
to: SD,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: SD },
entry(SD, A_D_IN),
TraceEvent::Entered { state: SD },
TraceEvent::TransitionComplete {
from: Some(SC),
to: SD,
},
]
}
fn assert_journal(actual: &[TraceEvent], expected: &[TraceEvent]) {
let mismatch = actual.iter().zip(expected.iter()).position(|(a, e)| a != e);
if let Some(i) = mismatch {
panic!(
"mismatch at index {}\n actual: {:?}\n expected: {:?}",
i,
actual.get(i),
expected.get(i)
);
}
assert_eq!(
actual.len(),
expected.len(),
"length mismatch: actual {} vs expected {}",
actual.len(),
expected.len()
);
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_to_immediate_grandparent() {
// D → C: exit D only. C is target, not exited, not re-entered.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToC).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_UPTOC },
TraceEvent::EventDelivered {
handler_state: SD,
event: E_UPTOC,
},
TraceEvent::TransitionFired {
from: Some(SD),
to: SC,
reason: TransitionReason::Event { event: E_UPTOC },
},
TraceEvent::ExitBegan { state: SD },
exit_(SD, A_D_OUT),
TraceEvent::Exited { state: SD },
TraceEvent::TransitionComplete {
from: Some(SD),
to: SC,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_two_levels() {
// D → B: exit D, exit C. B is target, not exited.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToB).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_UPTOB },
TraceEvent::EventDelivered {
handler_state: SD,
event: E_UPTOB,
},
TraceEvent::TransitionFired {
from: Some(SD),
to: SB,
reason: TransitionReason::Event { event: E_UPTOB },
},
TraceEvent::ExitBegan { state: SD },
exit_(SD, A_D_OUT),
TraceEvent::Exited { state: SD },
TraceEvent::ExitBegan { state: SC },
exit_(SC, A_C_OUT),
TraceEvent::Exited { state: SC },
TraceEvent::TransitionComplete {
from: Some(SD),
to: SB,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_three_levels_to_a() {
// D → A: exit D, C, B. A is target, not exited.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToA).await;
let actual = m.take_journal();
let mut expected = initial_descent();
expected.extend(vec![
TraceEvent::EventReceived { event: E_UPTOA },
TraceEvent::EventDelivered {
handler_state: SD,
event: E_UPTOA,
},
TraceEvent::TransitionFired {
from: Some(SD),
to: SA,
reason: TransitionReason::Event { event: E_UPTOA },
},
TraceEvent::ExitBegan { state: SD },
exit_(SD, A_D_OUT),
TraceEvent::Exited { state: SD },
TraceEvent::ExitBegan { state: SC },
exit_(SC, A_C_OUT),
TraceEvent::Exited { state: SC },
TraceEvent::ExitBegan { state: SB },
exit_(SB, A_B_OUT),
TraceEvent::Exited { state: SB },
TraceEvent::TransitionComplete {
from: Some(SD),
to: SA,
},
]);
assert_journal(&actual, &expected);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_target_not_re_entered() {
// After D → A: A must NOT appear in any Entered event after the initial descent.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToA).await;
let j = m.take_journal();
let split = j
.iter()
.position(|e| matches!(e, TraceEvent::EventDelivered { event: E_UPTOA, .. }))
.unwrap();
let a_re_entered = j[split..]
.iter()
.filter(|e| matches!(e, TraceEvent::Entered { state: SA }))
.count();
assert_eq!(
a_re_entered, 0,
"target A must not re-enter on up-transition"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_target_action_not_fired() {
// After D → A: a_in must NOT fire after the initial descent.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToA).await;
let j = m.take_journal();
let split = j
.iter()
.position(|e| matches!(e, TraceEvent::EventDelivered { event: E_UPTOA, .. }))
.unwrap();
let a_in_after = j[split..]
.iter()
.filter(|e| {
matches!(
e,
TraceEvent::ActionInvoked {
state: SA,
action: A_A_IN,
..
}
)
})
.count();
assert_eq!(
a_in_after, 0,
"target's entry action must not fire on up-transition"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_no_default_descent() {
// After D → A: no default-descent. The journal stops with Exited(B).
// A is the new innermost active state, with no active child.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToA).await;
let j = m.take_journal();
let split = j
.iter()
.position(|e| matches!(e, TraceEvent::EventDelivered { event: E_UPTOA, .. }))
.unwrap();
// Nothing after this slice should be Entered (no descent).
let entered_after = j[split..]
.iter()
.filter(|e| matches!(e, TraceEvent::Entered { .. }))
.count();
assert_eq!(entered_after, 0, "up-transition: no default-descent");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_current_state_is_target_after() {
// After D → B, the innermost active state is B (composite, no active child).
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToB).await;
// current_state() should return B's public variant.
// Indirect check: the most recent Entered (B's, from initial descent) is the
// last Entered before the up-transition; nothing after.
let j = m.take_journal();
let last_entered = j
.iter()
.enumerate()
.rev()
.find(|(_, e)| matches!(e, TraceEvent::Entered { .. }))
.map(|(i, _)| i);
// Find the EVENT-driven UpToB transition (initial defaults
// emit TransitionFired{Internal} too).
let split = j
.iter()
.position(|e| {
matches!(
e,
TraceEvent::TransitionFired {
reason: TransitionReason::Event { .. },
..
}
)
})
.unwrap();
// The last Entered event must be BEFORE the transition.
assert!(
last_entered.unwrap() < split,
"up-transition: no entries after the transition fires"
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn det_up_chained_then_lateral() {
// D → C, then C is a leaf with no children, so this becomes the new
// innermost. From C we don't have any other handlers, so test ends here.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Up::new(Ctx);
let _ = m.dispatch(Ev::UpToC).await;
let _ = m.dispatch(Ev::Halt).await;
let j = m.take_journal();
// After UpToC, we should have Exited(D) but C remains. Halt then exits
// C → B → A → Root.
let exits: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
assert_eq!(
exits,
vec![SD, SC, SB, SA, SR],
"up to C, then terminate exits remaining path"
);
})
.await;
}
hsmc/tests/journal_dump.rs
+90
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@@ -0,0 +1,90 @@
//! Dumps a journal for visual inspection. Run with:
//!
//! cargo test -p hsmc --features tokio,journal --test journal_dump -- --nocapture
//!
//! Not an assertion — just shows the actual sequence so we can sanity-check
//! that "EVERYTHING" is journaled.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::statechart;
#[derive(Default)]
pub struct Ctx {
pub n: u32,
}
#[derive(Debug, Clone, PartialEq)]
pub enum Ev {
Go,
Beep,
Halt,
}
statechart! {
Dump {
context: Ctx;
events: Ev;
default(Idle);
terminate(Halt);
entry: root_in;
exit: root_out;
state Idle {
entry: idle_in;
exit: idle_out;
on(Go) => Active;
on(Beep) => beep_at_idle;
}
state Active {
entry: active_in;
exit: active_out;
default(Sub);
state Sub {
entry: sub_in;
exit: sub_out;
on(Beep) => beep_at_sub;
}
}
}
}
impl DumpActions for DumpActionContext<'_> {
async fn root_in(&mut self) {
self.n += 1;
}
async fn root_out(&mut self) {}
async fn idle_in(&mut self) {}
async fn idle_out(&mut self) {}
async fn active_in(&mut self) {}
async fn active_out(&mut self) {}
async fn sub_in(&mut self) {}
async fn sub_out(&mut self) {}
async fn beep_at_idle(&mut self) {}
async fn beep_at_sub(&mut self) {}
}
#[tokio::test(flavor = "current_thread")]
async fn dump_journal() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Dump::new(Ctx::default());
let _ = m.dispatch(Ev::Beep).await;
let _ = m.dispatch(Ev::Go).await;
let _ = m.dispatch(Ev::Beep).await;
let _ = m.dispatch(Ev::Halt).await;
println!(
"\n=== JOURNAL DUMP (CHART_HASH={:#x}) ===",
Dump::<8>::CHART_HASH
);
for (i, e) in m.journal().iter().enumerate() {
println!(" {:>3}: {:?}", i, e);
}
println!("=== END ({} events) ===\n", m.journal().len());
})
.await;
}
hsmc/tests/journal_replay.rs
+211
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@@ -0,0 +1,211 @@
//! Replay tests: a hand-built EXPECTED journal compared byte-for-byte against
//! the ACTUAL journal produced by running the chart with a fixed event
//! sequence. This is the canonical correctness check the user asked for —
//! "EVERYTHING in the sequence has to be journaled and compared against the
//! expected sequence."
//!
//! When the codegen drifts (an entry actions reorders, a timer arms in a
//! different place, an event dispatches to a different state), exactly one
//! line of the expected vector mismatches and the test fails with a
//! pinpoint diff.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent, TransitionReason};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone, PartialEq)]
pub enum Ev {
Go,
Halt,
}
statechart! {
Replay {
context: Ctx;
events: Ev;
default(Idle);
terminate(Halt);
entry: root_in;
exit: root_out;
state Idle {
entry: idle_in;
exit: idle_out;
on(Go) => Active;
}
state Active {
entry: active_in;
exit: active_out;
default(Sub);
state Sub {
entry: sub_in;
exit: sub_out;
}
}
}
}
impl ReplayActions for ReplayActionContext<'_> {
async fn root_in(&mut self) {}
async fn root_out(&mut self) {}
async fn idle_in(&mut self) {}
async fn idle_out(&mut self) {}
async fn active_in(&mut self) {}
async fn active_out(&mut self) {}
async fn sub_in(&mut self) {}
async fn sub_out(&mut self) {}
}
// State indices.
const ST_ROOT: u16 = 0;
const ST_IDLE: u16 = 1;
const ST_ACTIVE: u16 = 2;
const ST_SUB: u16 = 3;
// Action indices.
const A_ROOT_IN: u16 = 0;
const A_ROOT_OUT: u16 = 1;
const A_IDLE_IN: u16 = 2;
const A_IDLE_OUT: u16 = 3;
const A_ACTIVE_IN: u16 = 4;
const A_ACTIVE_OUT: u16 = 5;
const A_SUB_IN: u16 = 6;
const A_SUB_OUT: u16 = 7;
// Event indices.
const E_GO: u16 = 0;
const E_HALT: u16 = 1;
#[tokio::test(flavor = "current_thread")]
async fn replay_full_lifecycle_matches_expected() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = Replay::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
let _ = m.dispatch(Ev::Halt).await;
let actual = m.take_journal();
let expected: Vec<TraceEvent> = vec![
// ── First step: enter the chart ──
TraceEvent::Started {
chart_hash: Replay::<8>::CHART_HASH,
},
TraceEvent::EnterBegan { state: ST_ROOT },
TraceEvent::ActionInvoked {
state: ST_ROOT,
action: A_ROOT_IN,
kind: ActionKind::Entry,
},
TraceEvent::Entered { state: ST_ROOT },
// Root's `default(Idle)` fires as an internal transition.
TraceEvent::TransitionFired {
from: Some(ST_ROOT),
to: ST_IDLE,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: ST_IDLE },
TraceEvent::ActionInvoked {
state: ST_IDLE,
action: A_IDLE_IN,
kind: ActionKind::Entry,
},
TraceEvent::Entered { state: ST_IDLE },
TraceEvent::TransitionComplete {
from: Some(ST_ROOT),
to: ST_IDLE,
},
// ── Go event delivered to Idle, transition to Active → Sub ──
TraceEvent::EventReceived { event: E_GO },
TraceEvent::EventDelivered {
handler_state: ST_IDLE,
event: E_GO,
},
TraceEvent::TransitionFired {
from: Some(ST_IDLE),
to: ST_ACTIVE,
reason: TransitionReason::Event { event: E_GO },
},
TraceEvent::ExitBegan { state: ST_IDLE },
TraceEvent::ActionInvoked {
state: ST_IDLE,
action: A_IDLE_OUT,
kind: ActionKind::Exit,
},
TraceEvent::Exited { state: ST_IDLE },
TraceEvent::EnterBegan { state: ST_ACTIVE },
TraceEvent::ActionInvoked {
state: ST_ACTIVE,
action: A_ACTIVE_IN,
kind: ActionKind::Entry,
},
TraceEvent::Entered { state: ST_ACTIVE },
// Active's `default(Sub)` fires as an internal transition,
// bracketed by its own TransitionFired/Complete.
TraceEvent::TransitionFired {
from: Some(ST_ACTIVE),
to: ST_SUB,
reason: TransitionReason::Internal,
},
TraceEvent::EnterBegan { state: ST_SUB },
TraceEvent::ActionInvoked {
state: ST_SUB,
action: A_SUB_IN,
kind: ActionKind::Entry,
},
TraceEvent::Entered { state: ST_SUB },
TraceEvent::TransitionComplete {
from: Some(ST_ACTIVE),
to: ST_SUB,
},
TraceEvent::TransitionComplete {
from: Some(ST_IDLE),
to: ST_ACTIVE,
},
// ── Halt event triggers termination: exit Sub → Active → root, then Terminated ──
TraceEvent::EventReceived { event: E_HALT },
TraceEvent::TerminateRequested { event: E_HALT },
TraceEvent::ExitBegan { state: ST_SUB },
TraceEvent::ActionInvoked {
state: ST_SUB,
action: A_SUB_OUT,
kind: ActionKind::Exit,
},
TraceEvent::Exited { state: ST_SUB },
TraceEvent::ExitBegan { state: ST_ACTIVE },
TraceEvent::ActionInvoked {
state: ST_ACTIVE,
action: A_ACTIVE_OUT,
kind: ActionKind::Exit,
},
TraceEvent::Exited { state: ST_ACTIVE },
TraceEvent::ExitBegan { state: ST_ROOT },
TraceEvent::ActionInvoked {
state: ST_ROOT,
action: A_ROOT_OUT,
kind: ActionKind::Exit,
},
TraceEvent::Exited { state: ST_ROOT },
TraceEvent::Terminated,
];
let mismatch_at = actual
.iter()
.zip(expected.iter())
.position(|(a, e)| a != e)
.map(|i| i.to_string())
.unwrap_or_else(|| "<length-mismatch>".to_string());
assert_eq!(
actual, expected,
"journal divergence at index {}",
mismatch_at
);
})
.await;
}
hsmc/tests/journal_replay_emit.rs
+74
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@@ -0,0 +1,74 @@
//! Replay test for emit() journaling.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, TraceEvent};
#[derive(Default)]
pub struct Ctx;
#[derive(Debug, Clone)]
pub enum Ev {
Trigger,
Followup,
Halt,
}
statechart! {
EmitProbe {
context: Ctx;
events: Ev;
default(A);
terminate(Halt);
state A {
on(Trigger) => emit_followup;
on(Followup) => B;
}
state B {
entry: noop;
}
}
}
impl EmitProbeActions for EmitProbeActionContext<'_> {
async fn emit_followup(&mut self) {
self.emit(Ev::Followup).unwrap();
}
async fn noop(&mut self) {}
}
#[tokio::test(flavor = "current_thread")]
async fn emit_queued_appears_in_journal() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = EmitProbe::new(Ctx::default());
let _ = m.dispatch(Ev::Trigger).await;
let saw_emit = m
.journal()
.iter()
.any(|e| matches!(e, TraceEvent::EmitQueued { .. }));
assert!(
saw_emit,
"journal must contain EmitQueued, got {:?}",
m.journal()
);
// The follow-up event MUST be delivered (proving the queue actually
// drained the emit'd event).
let delivered_followup = m.journal().iter().any(|e| {
matches!(
e,
TraceEvent::EventDelivered { event: 1, .. } // 1 = Followup (Trigger=0, Followup=1)
)
});
assert!(
delivered_followup,
"expected Followup to be delivered after emit"
);
})
.await;
}
hsmc/tests/journal_replay_timer.rs
+93
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@@ -0,0 +1,93 @@
//! Replay test for timer arm + cancel paths.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, TraceEvent};
#[derive(Default)]
pub struct Ctx {
pub fired: u32,
}
#[derive(Debug, Clone)]
pub enum Ev {
Stop,
Halt,
}
statechart! {
TimerProbe {
context: Ctx;
events: Ev;
default(Counting);
terminate(Halt);
state Counting {
entry: noop;
exit: noop2;
on(after hsmc::Duration::from_millis(100)) => Done;
on(Stop) => Done;
}
state Done {
entry: noop3;
}
}
}
impl TimerProbeActions for TimerProbeActionContext<'_> {
async fn noop(&mut self) {}
async fn noop2(&mut self) {}
async fn noop3(&mut self) {}
}
#[tokio::test(flavor = "current_thread")]
async fn timer_arm_then_cancel_journals_both() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TimerProbe::new(Ctx::default());
let _ = m.dispatch(Ev::Stop).await;
let timer_events: Vec<&TraceEvent> = m
.journal()
.iter()
.filter(|e| {
matches!(
e,
TraceEvent::TimerArmed { .. }
| TraceEvent::TimerCancelled { .. }
| TraceEvent::TimerFired { .. }
)
})
.collect();
assert_eq!(
timer_events.len(),
2,
"expected 2 timer events, got {:?}",
timer_events
);
assert!(
matches!(
timer_events[0],
TraceEvent::TimerArmed {
state: 1,
timer: 0,
ns: 100_000_000
}
),
"got {:?}",
timer_events[0]
);
assert!(
matches!(
timer_events[1],
TraceEvent::TimerCancelled { state: 1, timer: 0 }
),
"got {:?}",
timer_events[1]
);
})
.await;
}
hsmc/tests/journal_smoke.rs
+267
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@@ -0,0 +1,267 @@
//! Smoke tests for the deterministic execution journal (`feature = "journal"`).
//!
//! Every observable atom — entries, exits, action invocations (with kind),
//! during start/cancel, timer arm/cancel/fire, queued emits, event delivery,
//! transitions, termination — must appear in the journal in canonical order
//! for a fixed `(chart, ctx, event sequence)` input. These tests pin down
//! that order on small chart shapes so any regression in codegen is caught
//! immediately.
//!
//! Tests run only when both `tokio` and `journal` features are enabled.
#![cfg(all(feature = "tokio", feature = "journal"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, ActionKind, TraceEvent};
// ─────────────────────────────────────────────────────────────────────
// Small chart: A → B on Go, with entry/exit actions in a hierarchy.
// ─────────────────────────────────────────────────────────────────────
#[derive(Default)]
pub struct Ctx {
pub log: Vec<&'static str>,
}
#[derive(Debug, Clone, PartialEq)]
pub enum Ev {
Go,
Halt,
}
statechart! {
JournalProbe {
context: Ctx;
events: Ev;
default(Idle);
terminate(Halt);
entry: root_in;
exit: root_out;
state Idle {
entry: idle_in;
exit: idle_out;
on(Go) => Active;
}
state Active {
entry: active_in;
exit: active_out;
default(Sub);
state Sub {
entry: sub_in;
exit: sub_out;
}
}
}
}
impl JournalProbeActions for JournalProbeActionContext<'_> {
async fn root_in(&mut self) {
self.log.push("root_in");
}
async fn root_out(&mut self) {
self.log.push("root_out");
}
async fn idle_in(&mut self) {
self.log.push("idle_in");
}
async fn idle_out(&mut self) {
self.log.push("idle_out");
}
async fn active_in(&mut self) {
self.log.push("active_in");
}
async fn active_out(&mut self) {
self.log.push("active_out");
}
async fn sub_in(&mut self) {
self.log.push("sub_in");
}
async fn sub_out(&mut self) {
self.log.push("sub_out");
}
}
#[tokio::test(flavor = "current_thread")]
async fn journal_records_initial_descent() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = JournalProbe::new(Ctx::default());
// Drive the initial entry chain by stepping once with no event.
let _ = m.dispatch(Ev::Go).await;
let j = m.journal();
// First event must be Started.
assert!(matches!(j[0], TraceEvent::Started { .. }));
// Started carries the chart's stable hash.
if let TraceEvent::Started { chart_hash } = j[0] {
assert_eq!(chart_hash, JournalProbe::<8>::CHART_HASH);
}
// We expect (in order, for the initial descent root → Idle):
// Started
// Entered(root)
// ActionInvoked(root, root_in, Entry)
// Entered(Idle)
// ActionInvoked(Idle, idle_in, Entry)
// ... (then the Go event delivery / transition / sub entry)
let states_entered: Vec<u16> = j
.iter()
.filter_map(|e| match e {
TraceEvent::Entered { state } => Some(*state),
_ => None,
})
.collect();
// At minimum we entered root (id 0), then Idle, then Active, then Sub.
assert_eq!(
states_entered.len(),
4,
"expected 4 Entered events, got {:?}",
j
);
// Action kinds appear in order Entry → Handler (none here) → Exit.
let kinds: Vec<ActionKind> = j
.iter()
.filter_map(|e| match e {
TraceEvent::ActionInvoked { kind, .. } => Some(*kind),
_ => None,
})
.collect();
// Actions on the journey: Entry x4 (root, idle, active, sub),
// Exit x1 (idle), Entry x2 (active, sub) — wait no:
// Initial descent is root → Idle. Entries: root_in, idle_in.
// Then Go fires: Idle exits (idle_out), Active enters (active_in),
// Sub enters (sub_in).
// Total: Entry(root), Entry(idle), Exit(idle), Entry(active), Entry(sub).
let entry_count = kinds.iter().filter(|k| **k == ActionKind::Entry).count();
let exit_count = kinds.iter().filter(|k| **k == ActionKind::Exit).count();
assert_eq!(
entry_count, 4,
"expected 4 entry actions, got kinds {:?}",
kinds
);
assert_eq!(
exit_count, 1,
"expected 1 exit action, got kinds {:?}",
kinds
);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn journal_includes_transition_event() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = JournalProbe::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
let saw_transition = m
.journal()
.iter()
.any(|e| matches!(e, TraceEvent::TransitionFired { .. }));
assert!(saw_transition, "journal must contain TransitionFired");
let saw_event_delivered = m
.journal()
.iter()
.any(|e| matches!(e, TraceEvent::EventDelivered { .. }));
assert!(saw_event_delivered, "journal must contain EventDelivered");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn journal_records_termination() {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = JournalProbe::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
let _ = m.dispatch(Ev::Halt).await;
let j = m.journal();
assert!(
matches!(j.last(), Some(TraceEvent::Terminated)),
"journal must end with Terminated, got tail: {:?}",
&j[j.len().saturating_sub(3)..]
);
// Termination exits all states from leaf to root (Sub → Active → Idle? No,
// Idle was already exited on Go. After Halt the active path is
// root → Active → Sub. Exits: Sub, Active, root.
let post_halt_exits: Vec<u16> = j.iter()
.skip_while(|e| !matches!(e, TraceEvent::EventDelivered { .. } if matches!(j.iter().rev().find(|x| matches!(x, TraceEvent::EventDelivered { .. })), Some(_))))
.filter_map(|e| match e {
TraceEvent::Exited { state } => Some(*state),
_ => None,
})
.collect();
// We at least exited 4 times across the run (idle once, then sub/active/root on terminate).
assert!(post_halt_exits.len() >= 3, "expected at least 3 exits across the run, got {:?}", j);
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn journal_is_byte_deterministic_across_runs() {
// Same chart, same context, same event sequence ⇒ identical journal.
let run = || async {
tokio::task::LocalSet::new()
.run_until(async {
let mut m = JournalProbe::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
let _ = m.dispatch(Ev::Halt).await;
m.take_journal()
})
.await
};
let first = run().await;
for i in 1..10 {
let again = run().await;
assert_eq!(first, again, "journal divergence on run #{}", i);
}
}
#[tokio::test(flavor = "current_thread")]
async fn clear_journal_empties_the_journal() {
// Pins down `JournalSink::clear`: after dispatching events that
// produce journal entries, calling `clear_journal()` must empty
// the journal. Subsequent `journal()` returns an empty slice;
// `take_journal()` returns an empty Vec.
tokio::task::LocalSet::new()
.run_until(async {
let mut m = JournalProbe::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
assert!(
!m.journal().is_empty(),
"journal should have entries before clear"
);
m.clear_journal();
assert!(
m.journal().is_empty(),
"journal must be empty after clear_journal()"
);
let taken = m.take_journal();
assert!(taken.is_empty(), "take_journal() after clear must be empty");
})
.await;
}
#[tokio::test(flavor = "current_thread")]
async fn chart_hash_is_stable() {
// Two instances of the same chart must agree on CHART_HASH.
let _m1 = JournalProbe::new(Ctx::default());
let _m2 = JournalProbe::new(Ctx::default());
assert_eq!(
JournalProbe::<8>::CHART_HASH,
JournalProbe::<8>::CHART_HASH,
"chart hash must be stable across instantiations"
);
// CHART_HASH must be nonzero — proves the FNV-1a fingerprint actually ran.
assert_ne!(JournalProbe::<8>::CHART_HASH, 0);
}
hsmc/tests/trace_format.rs
+429
View File
@@ -0,0 +1,429 @@
//! Verifies the textual format of the unified observation pipeline's
//! `trace-log` sink line-for-line.
//!
//! Each `__chart_observe!` arm has a stable logfmt-style format:
//!
//! `[statechart:<Name>] <verb> key=value key=value …`
//!
//! These tests pin every verb's exact rendering so a real-life log capture
//! can be diffed against expected behavior. The chart is exercised through
//! both the journal sink (so we can assert atom-by-atom equivalence) and
//! the trace-log sink (so we can assert the rendered strings).
#![cfg(all(feature = "tokio", feature = "journal", feature = "trace-log"))]
#![allow(unexpected_cfgs)]
use hsmc::{statechart, Duration, TraceEvent, TransitionReason};
use std::sync::{Mutex, MutexGuard, OnceLock};
// ── Capture sink ─────────────────────────────────────────────────────
//
// log::set_logger can only be installed once per process. The capture
// holds a single Vec<String> shared across all tests, plus a global
// `TEST_LOCK` that each test holds across its drive-then-assert
// section so concurrent tests don't interleave their captured lines.
struct Capture {
lines: Mutex<Vec<String>>,
}
impl log::Log for Capture {
fn enabled(&self, _: &log::Metadata<'_>) -> bool {
true
}
fn log(&self, record: &log::Record<'_>) {
if let Ok(mut g) = self.lines.lock() {
g.push(format!("{}", record.args()));
}
}
fn flush(&self) {}
}
static CAPTURE: OnceLock<&'static Capture> = OnceLock::new();
static TEST_LOCK: Mutex<()> = Mutex::new(());
fn install_capture() -> &'static Capture {
*CAPTURE.get_or_init(|| {
let leaked: &'static Capture = Box::leak(Box::new(Capture {
lines: Mutex::new(Vec::new()),
}));
let _ = log::set_logger(leaked);
log::set_max_level(log::LevelFilter::Trace);
leaked
})
}
/// RAII helper. Acquire before driving the chart, drop after assertions
/// — keeps `tests::*` from interleaving captured log lines.
fn lock_for_test() -> MutexGuard<'static, ()> {
install_capture();
let g = TEST_LOCK.lock().unwrap_or_else(|p| p.into_inner());
// Clear any lines left by a previous test that paniced before
// draining (poison case).
let cap = CAPTURE.get().unwrap();
cap.lines.lock().unwrap().clear();
g
}
fn current_lines() -> Vec<String> {
let cap = install_capture();
cap.lines.lock().unwrap().clone()
}
// ── Test chart ───────────────────────────────────────────────────────
//
// Covers every observation verb the macro can emit. Two states with
// entry/exit actions, a handler that emits and transitions, a timer,
// a during, and a terminate event.
#[derive(Default)]
pub struct Ctx {
pub buf: u32,
}
#[derive(Debug, Clone)]
pub enum Ev {
Go,
Step,
Halt,
}
statechart! {
TraceFmt {
context: Ctx;
events: Ev;
default(Idle);
terminate(Halt);
state Idle {
entry: idle_in;
exit: idle_out;
during: tick(buf);
on(after Duration::from_secs(60)) => Idle;
on(Go) => Active;
}
state Active {
entry: active_in;
exit: active_out;
on(Step) => bump;
on(Halt) => Idle;
}
}
}
async fn tick(_buf: &mut u32) -> Ev {
Ev::Step
}
impl TraceFmtActions for TraceFmtActionContext<'_> {
async fn idle_in(&mut self) {}
async fn idle_out(&mut self) {}
async fn active_in(&mut self) {}
async fn active_out(&mut self) {}
async fn bump(&mut self) {
let _ = self.emit(Ev::Halt);
}
}
// ── Helpers ──────────────────────────────────────────────────────────
/// Returns true iff `line` matches the expected `[statechart:TraceFmt] verb …`
/// shape. Every line emitted by the dispatcher must.
fn well_formed(line: &str) -> bool {
line.starts_with("[statechart:TraceFmt] ")
}
/// Filter `lines` to only those whose verb (the first token after the
/// prefix) equals `verb`. Useful for asserting on a single verb's lines.
fn lines_with_verb<'a>(lines: &'a [String], verb: &str) -> Vec<&'a str> {
let prefix = "[statechart:TraceFmt] ";
lines
.iter()
.filter_map(|l| l.strip_prefix(prefix))
.filter(|rest| rest.split_whitespace().next() == Some(verb))
.map(|s| s.as_ref())
.collect()
}
// ── Tests ────────────────────────────────────────────────────────────
#[tokio::test(flavor = "current_thread")]
async fn every_line_uses_statechart_prefix() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
let _ = m.dispatch(Ev::Halt).await;
})
.await;
let lines = current_lines();
assert!(!lines.is_empty(), "no log lines captured");
for l in &lines {
assert!(
well_formed(l),
"line missing [statechart:TraceFmt] prefix: {l:?}"
);
}
}
#[tokio::test(flavor = "current_thread")]
async fn enter_and_exit_emit_begin_end_pairs() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
})
.await;
let lines = current_lines();
let entering = lines_with_verb(&lines, "entering");
let entered = lines_with_verb(&lines, "entered");
assert_eq!(
entering.len(),
entered.len(),
"every `entering` must have a matching `entered`"
);
assert!(entering.contains(&"entering state=TraceFmt"));
assert!(entered.contains(&"entered state=TraceFmt"));
assert!(entering.contains(&"entering state=Idle"));
assert!(entered.contains(&"entered state=Idle"));
}
#[tokio::test(flavor = "current_thread")]
async fn transition_records_event_reason() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
})
.await;
let lines = current_lines();
let begins = lines_with_verb(&lines, "transition-begin");
assert!(!begins.is_empty(), "no transition-begin lines captured");
let line = begins[0];
assert!(
line.contains("from=Idle"),
"transition-begin missing from=Idle: {line:?}"
);
assert!(
line.contains("to=Active"),
"transition-begin missing to=Active: {line:?}"
);
assert!(
line.contains("reason=event:Go"),
"transition-begin missing reason=event:Go: {line:?}"
);
let completes = lines_with_verb(&lines, "transition-complete");
assert!(
!completes.is_empty(),
"transition-complete must follow transition-begin"
);
assert!(completes[0].contains("from=Idle") && completes[0].contains("to=Active"));
}
#[tokio::test(flavor = "current_thread")]
async fn event_lifecycle_received_then_outcome() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
})
.await;
let lines = current_lines();
let received = lines_with_verb(&lines, "event-received");
let delivered = lines_with_verb(&lines, "event-delivered");
assert!(received.iter().any(|l| l.contains("name=Go")));
assert!(delivered
.iter()
.any(|l| l.contains("name=Go") && l.contains("handler=Idle")));
}
#[tokio::test(flavor = "current_thread")]
async fn during_emits_started_and_cancelled() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
// Go enters Active, which causes Idle's during to be cancelled.
let _ = m.dispatch(Ev::Go).await;
})
.await;
let lines = current_lines();
let started = lines_with_verb(&lines, "during-started");
let cancelled = lines_with_verb(&lines, "during-cancelled");
assert!(started.iter().any(|l| l.contains("during=tick")));
assert!(cancelled.iter().any(|l| l.contains("during=tick")));
}
#[tokio::test(flavor = "current_thread")]
async fn timer_arm_then_cancel_lines() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
})
.await;
let lines = current_lines();
let armed = lines_with_verb(&lines, "timer-armed");
let cancelled = lines_with_verb(&lines, "timer-cancelled");
assert!(
armed.iter().any(|l| l.contains("state=Idle")),
"timer should arm when Idle is entered"
);
assert!(
cancelled.iter().any(|l| l.contains("state=Idle")),
"timer should be cancelled when Idle is exited (Go transition)"
);
}
#[tokio::test(flavor = "current_thread")]
async fn emit_queued_appears_for_handler_emit() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
// Step's handler calls emit(Halt).
let _ = m.dispatch(Ev::Step).await;
})
.await;
let lines = current_lines();
let queued = lines_with_verb(&lines, "emit-queued");
assert!(
queued.iter().any(|l| l.contains("event=Halt")),
"expected emit-queued event=Halt line: {lines:?}"
);
}
#[tokio::test(flavor = "current_thread")]
async fn terminate_records_request_then_terminated() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
// Halt from Active is a transition to Idle (no terminate);
// dispatch Halt twice via Idle to actually terminate.
// First Go landed us in Active; Halt → Idle (handler).
let _ = m.dispatch(Ev::Halt).await; // back to Idle
let _ = m.dispatch(Ev::Halt).await; // now terminate
})
.await;
let lines = current_lines();
let req = lines_with_verb(&lines, "terminate-requested");
let term = lines_with_verb(&lines, "terminated");
assert!(
req.iter().any(|l| l.contains("event=Halt")),
"expected terminate-requested event=Halt: {lines:?}"
);
assert!(
!term.is_empty(),
"expected a final `terminated` line: {lines:?}"
);
}
#[tokio::test(flavor = "current_thread")]
async fn started_records_chart_hash() {
let _g = lock_for_test();
tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
})
.await;
let lines = current_lines();
let started = lines_with_verb(&lines, "started");
assert!(!started.is_empty(), "expected one `started` line");
assert!(
started[0].contains("chart_hash=0x"),
"started must include chart_hash in hex: {:?}",
started[0]
);
}
#[tokio::test(flavor = "current_thread")]
async fn trace_and_journal_have_matching_atom_count() {
// The "one journal, multiple outputs" contract: every TraceEvent
// recorded in the journal corresponds to exactly one log line in
// the trace, modulo verb-name differences.
let _g = lock_for_test();
let actual = tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
m.take_journal()
})
.await;
let lines = current_lines();
assert_eq!(
actual.len(),
lines.len(),
"journal/trace atom count diverged ({} vs {} lines)",
actual.len(),
lines.len()
);
}
#[tokio::test(flavor = "current_thread")]
async fn transition_reason_in_journal_matches_trace() {
// The journal records the structured `TransitionReason::Event { event }`
// and the trace renders it as `event:<VariantName>`. They must agree.
let _g = lock_for_test();
let actual = tokio::task::LocalSet::new()
.run_until(async {
let mut m = TraceFmt::new(Ctx::default());
let _ = m.dispatch(Ev::Go).await;
m.take_journal()
})
.await;
let lines = current_lines();
let journal_reason = actual.iter().find_map(|e| match e {
TraceEvent::TransitionFired { reason, .. } => Some(*reason),
_ => None,
});
let trace_reason_line = lines_with_verb(&lines, "transition-begin")
.first()
.copied()
.map(|s| s.to_string());
assert_eq!(
journal_reason,
Some(TransitionReason::Event { event: 0 }),
"expected first transition driven by Ev::Go (event id 0)"
);
assert!(
trace_reason_line
.as_deref()
.is_some_and(|l| l.contains("reason=event:Go")),
"trace reason should match journal reason: {trace_reason_line:?}"
);
}
justfile
+356
View File
@@ -0,0 +1,356 @@
# justfile for the hsmc workspace (hsmc + hsmc-macros + verification)
# High-level development and CI workflows.
#
# All recipes run inside `mise exec` so mise-managed tools (Rust with
# components + embedded targets, opam, cargo subcommands, the
# project's `.venv/`) are automatically on PATH. No `mise activate`
# needed; no per-recipe wrappers; no shebangs.
#
# Two settings, both routed through `mise exec --`:
# set shell — used per line for short recipes
# set script-interpreter — used for `[script]` recipes that need
# multi-line state (loops, branches, etc.)
set shell := ["mise", "exec", "--", "sh", "-cu"]
set script-interpreter := ["mise", "exec", "--", "sh", "-eu"]
# =============================================================================
# Configuration
# =============================================================================
# Treat all warnings as errors
rustflags := "-D warnings"
# Code coverage target percentage (fail if below this threshold)
coverage_target := "80"
# Timeout for coverage analysis in seconds
coverage_timeout := "600"
# =============================================================================
# Default recipe - show available recipes
default:
@just --list
# =============================================================================
# Primary Development Workflows
# =============================================================================
# Quick development loop: format + lint + fast tests (default features only)
[script]
dev:
echo "🔄 Running development checks..."
cargo fmt
RUSTFLAGS="{{rustflags}}" cargo clippy --workspace --all-targets &
RUSTFLAGS="{{rustflags}}" cargo nextest run --workspace &
wait
echo "✅ Development checks passed"
# Pre-commit checks across all feature combinations (tokio/embassy are mutually exclusive)
check:
@echo "Running format check..."
cargo fmt --all -- --check
@echo ""
@echo "Running clippy on all feature combinations..."
RUSTFLAGS="{{rustflags}}" cargo clippy --workspace --all-targets --no-default-features
RUSTFLAGS="{{rustflags}}" cargo clippy --workspace --all-targets --features tokio
RUSTFLAGS="{{rustflags}}" cargo clippy --workspace --all-targets --features embassy
@echo ""
@echo "Verifying compilation on all feature combinations..."
RUSTFLAGS="{{rustflags}}" cargo test --workspace --no-default-features --no-run
RUSTFLAGS="{{rustflags}}" cargo test --workspace --features tokio --no-run
RUSTFLAGS="{{rustflags}}" cargo test --workspace --features embassy --no-run
@echo ""
@echo "✅ All checks passed"
# Run all tests with comprehensive feature coverage
test:
@echo "Running tests with all feature combinations..."
RUSTFLAGS="{{rustflags}}" cargo nextest run --workspace --no-default-features
RUSTFLAGS="{{rustflags}}" cargo nextest run --workspace --features tokio
RUSTFLAGS="{{rustflags}}" cargo nextest run --workspace --features embassy
@echo ""
@echo "Running doctests..."
cargo test --doc --workspace
@echo "✅ All feature combinations tested"
# Before pushing: check + test + coverage
pre-push: check test coverage
@echo ""
@echo "✅ Pre-push checks passed - safe to push!"
# Comprehensive pre-release validation
[script]
pre-release: check test coverage audit mutants examples
# Verify documentation version matches crate version
echo ""
echo "📋 Verifying documentation version..."
VERSION=$(grep '^version = ' Cargo.toml | head -1 | sed 's/.*"\(.*\)".*/\1/')
MAJOR_MINOR=$(echo $VERSION | cut -d. -f1-2)
# README uses the braced form: `hsmc = { version = "X.Y", ... }`
if ! grep -Eq "hsmc = \{[^}]*version = \"$MAJOR_MINOR(\.[0-9]+)?\"" README.md; then
echo "❌ ERROR: README.md should reference version $MAJOR_MINOR (crate is $VERSION)"
echo " Update the install snippet in README.md"
exit 1
fi
echo "✅ Documentation version correct: $MAJOR_MINOR"
# Workspace publish dry-run: hsmc-macros must publish before hsmc
echo ""
echo "📦 Verifying packages..."
cargo publish --dry-run -p hsmc-macros
cargo publish --dry-run -p hsmc
cargo package --list -p hsmc-macros > /tmp/hsmc-macros-files.txt
cargo package --list -p hsmc > /tmp/hsmc-files.txt
echo "✅ Packages verified"
echo ""
echo "✅ All pre-release checks passed!"
echo " - Code formatted and linted"
echo " - All tests passing on {default, tokio, embassy}"
echo " - Code coverage ≥ {{coverage_target}}%"
echo " - No security vulnerabilities"
echo " - Mutation testing complete"
echo " - All examples run / build successfully"
echo " - Documentation version verified"
echo " - Packages ready for publication"
echo ""
echo "📦 Ready to publish! Run (in order):"
echo " cargo publish -p hsmc-macros"
echo " cargo publish -p hsmc"
# =============================================================================
# Quality & Security
# =============================================================================
# Run code coverage analysis (tokio feature covers the widest surface area)
coverage:
@echo "Running code coverage analysis (target: {{coverage_target}}%)..."
cargo llvm-cov nextest --workspace --features tokio --html --output-dir coverage --fail-under-lines {{coverage_target}}
@echo "Coverage report: coverage/html/index.html"
# Mutation testing with cargo-mutants
mutants:
@echo "Running mutation testing..."
@echo "⚠️ This will use significant CPU and memory resources!"
# `tokio,journal` so journal_* and det_* tests (gated on both
# features) actually run — they're what catches mutants in
# JournalSink and the codegen-emitted journal hooks.
cargo mutants \
--no-shuffle \
--test-tool nextest \
--jobs 3 \
--features tokio,journal \
-vV
# Security audit + dependency checks
audit:
@echo "🔒 Running security checks..."
cargo audit
@echo "✅ Security checks passed"
# Run the full unsafe-audit matrix: const-eval at build, debug_assert!
# in debug tests, Miri for UB, mutants on the safety-relevant codegen.
# Mirrors the audit described in `docs/004. unsafe-safety-contract.md`.
[script]
safety:
echo "🔒 Unsafe safety audit"
echo ""
echo "1/4 — Compile-time const-eval (any out-of-range table entry"
echo " fails cargo check with E0080)..."
cargo check --workspace --all-targets
echo ""
echo "2/4 — Runtime debug_assert! in dev tests (every unsafe site"
echo " checks its bound on every dispatch)..."
cargo nextest run --workspace --no-default-features
cargo nextest run --workspace --features tokio
echo ""
echo "3/4 — Miri (UB detector under interpreted Rust)..."
just miri
echo ""
echo "4/4 — Mutation testing on safety-relevant codegen fns..."
# `--features hsmc/tokio,hsmc/journal --test-package hsmc` is
# essential: the safety-relevant tests (det_lateral, det_up,
# det_descent, etc.) live in hsmc/tests/ and are gated on those
# two features. Without them, cargo-mutants runs only the
# hsmc-macros per-package test set and large swathes of the
# LCA / path-derivation logic look uncovered when they aren't.
cargo mutants \
--regex "compute_transition_paths|compute_terminate_paths|compute_event_dispatch" \
--features hsmc/tokio,hsmc/journal \
--test-package hsmc \
--test-tool nextest \
--jobs 4 --no-shuffle
echo ""
echo "✅ Unsafe audit complete. See docs/004. unsafe-safety-contract.md"
echo " for which checks cover which failure modes."
# Run Miri for UB detection (auto-installs nightly + miri component if missing).
[script]
miri:
if ! rustup toolchain list 2>/dev/null | grep -q '^nightly'; then
echo " → installing nightly toolchain..."
rustup toolchain install nightly --component miri,rust-src --profile minimal
elif ! rustup component list --toolchain nightly --installed 2>/dev/null | grep -q '^miri'; then
echo " → adding miri component to nightly..."
rustup component add miri --toolchain nightly
fi
echo "Running Miri tests for UB detection (no-default-features)..."
# `--exclude hsmc-macros`: the macro crate's only integration test
# is `tests/ui.rs` which uses `trybuild` (compiles fixture files,
# globs the filesystem). That hits Miri's isolation sandbox and
# tests proc-macro behavior, not UB. Skip it.
# `--exclude hsmc-verification`: this crate is built with the
# nightly pinned in verification/mise.toml (nightly-2025-11-13);
# mixing toolchains under cargo +nightly miri test breaks builds.
cargo +nightly miri test --workspace --no-default-features \
--exclude hsmc-macros --exclude hsmc-verification
# Run Creusot deductive verification (self-installs opam, Why3, SMT solvers, cargo-creusot on first run).
[script]
verify:
printf '🔍 Setting up Creusot verification stack...\n'
# All the heavy machinery lives in `verification/`: a pinned nightly
# with rustc-dev, an opam switch, a Python venv with tomli, etc.
# `verification/mise.toml` declares it all. cd in, then re-eval mise
# env so opam/uv/python/cargo on PATH are the verification ones.
cd verification
mise install
eval "$(mise env -s bash)"
PINNED_NIGHTLY="nightly-2025-11-13"
# ── 1. opam init + switch (one-time) ─────────────────────────────
# `--no-depexts` everywhere: opam's system-package check would ask
# for things like `python-tomli` that need sudo on Arch. We supply
# those via mise's project-local Python venv (with tomli pip-installed).
if [ ! -d "$HOME/.opam" ]; then
printf ' → initializing opam (one-time, ~2 min)...\n'
opam init --yes --disable-sandboxing --bare --no-depexts
fi
if ! opam switch list -s 2>/dev/null | grep -qx 'hsmc-creusot'; then
printf ' → creating opam switch hsmc-creusot with OCaml 5.x (~5 min)...\n'
opam switch create hsmc-creusot 5.2.0 --yes --no-depexts
fi
eval "$(opam env --switch=hsmc-creusot --set-switch)"
# ── 2. Python deps for opam build scripts (`tomli`) ──────────────
# mise's `_.python.venv` auto-created `.venv/` here via uv, so the
# venv has no pip — use `uv pip install` directly into $VIRTUAL_ENV.
printf ' → uv pip install -r requirements.txt...\n'
uv pip install --quiet -r requirements.txt
# ── 3. Why3 + SMT solvers via opam (idempotent) ──────────────────
# alt-ergo + z3 cover the vast majority of Creusot proofs. cvc5
# opam build needs system GMP (sudo pacman -S gmp on Arch).
NEED=""
command -v why3 >/dev/null 2>&1 || NEED="$NEED why3"
command -v alt-ergo >/dev/null 2>&1 || NEED="$NEED alt-ergo"
command -v z3 >/dev/null 2>&1 || NEED="$NEED z3"
if [ -n "$NEED" ]; then
printf ' → opam install %s (slow — builds from source)...\n' "$NEED"
# shellcheck disable=SC2086
opam install --yes --no-depexts $NEED
fi
# ── 4. why3 config detect (registers solvers with Why3) ──────────
if [ ! -f "$HOME/.why3.conf" ]; then
printf ' → registering solvers with Why3...\n'
why3 config detect
fi
# ── 5. Clone Creusot source + run canonical INSTALL ──────────────
# creusot-install assumes it's running INSIDE the source tree (it
# invokes `cargo run --bin prelude-generator` etc.). Clone, cd, run.
# The pinned nightly comes from verification/mise.toml so cargo here
# resolves to it directly — no RUSTUP_TOOLCHAIN gymnastics needed.
CREUSOT_PIN="v0.9.0"
CREUSOT_SRC="$HOME/.local/share/hsmc-verify/creusot-${CREUSOT_PIN}"
CREUSOT_INSTALLED="$HOME/.local/share/creusot/why3find.json"
if [ ! -d "$CREUSOT_SRC/.git" ]; then
printf ' → git clone creusot @ %s...\n' "$CREUSOT_PIN"
mkdir -p "$(dirname "$CREUSOT_SRC")"
git clone --depth 1 --branch "$CREUSOT_PIN" \
https://github.com/creusot-rs/creusot "$CREUSOT_SRC"
fi
if [ ! -f "$CREUSOT_INSTALLED" ]; then
printf ' → running creusot ./INSTALL (~5 min — builds creusot-rustc)...\n'
# `RUSTUP_TOOLCHAIN` forces the cloned source's cargo to use the
# exact nightly mise pinned for verification/, regardless of what
# the source's own `rust-toolchain` file says (they should match,
# but be explicit).
( cd "$CREUSOT_SRC" && RUSTUP_TOOLCHAIN="$PINNED_NIGHTLY" cargo run --release --bin creusot-install )
fi
# ── 6. Run the actual verification ───────────────────────────────
# `cargo creusot prove` invokes why3find which resolves `verif/`
# relative to the workspace root (where why3find.json lives). cd
# back so the path resolution is correct.
#
# Two phases:
# `cargo creusot` — Rust → Coma IR, dumped into verif/
# `cargo creusot prove` — Why3 + SMT solvers discharge VCs
cd ..
if [ ! -f why3find.json ]; then
printf ' → cargo creusot init (one-time, populates why3find.json)...\n'
cargo creusot init || true # exits non-zero in workspaces but writes the file
fi
printf '\n🚀 cargo creusot (generate Coma IR)...\n'
cargo creusot
printf '\n🚀 cargo creusot prove --no-cache (force SMT solver invocations)...\n'
# `--no-cache` skips why3find's per-Coma-file proof cache and
# actually invokes alt-ergo + z3 + cvc4 for every VC. The wall-
# clock vs CPU-time gap (`time` output) is the parallel SMT work.
set +e
time cargo creusot prove --no-cache
PROVE_RC=$?
set -e
if [ "$PROVE_RC" -eq 0 ]; then
printf '\n✅ All VCs discharged. See verification/INVARIANTS.md for the rule mapping.\n'
else
printf '\n⚠ Some VCs unproven (cargo creusot prove exit %d).\n' "$PROVE_RC"
printf ' Iterate on contracts in verification/src/event_queue.rs / src/timer_table.rs.\n'
printf ' For a tighter loop: cargo creusot prove (from workspace root).\n'
fi
# =============================================================================
# Documentation & Utilities
# =============================================================================
# Build documentation and open in browser
doc:
cargo doc --no-deps --workspace --features tokio --open
# Format code
fmt:
cargo fmt --all
# Show project information
info:
@echo "hsmc workspace"
@echo " hsmc - Hierarchical state machines (statecharts) with a declarative proc macro"
@echo " hsmc-macros - Procedural macro implementation for the hsmc crate"
@echo ""
@echo "Rust: $(rustc --version)"
@echo "Cargo: $(cargo --version)"
@echo ""
@echo "Dependencies:"
@cargo tree --depth 1 -p hsmc
# Run all examples (tokio examples execute; embassy_full is a lib crate, build-only)
examples:
@echo "Running tokio examples..."
cargo run --example microwave --features tokio
cargo run --example during_radio --features tokio
@echo ""
@echo "Building embassy_full example (lib crate)..."
cargo build --example embassy_full --features embassy
@echo "✅ All examples completed successfully"
# Clean build artifacts
clean:
cargo clean
rm -rf mutants.out/ mutants.out.old/ mutation_history.json
rm -rf coverage/
mise.toml
+29
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# Project-local mise configuration for hsmc.
#
# Lists the dev/test/lint tooling the workspace needs. The verification
# subcrate has its OWN mise.toml (verification/mise.toml) that pins the
# specific nightly Rust + opam + Python venv that Creusot requires —
# `just verify` cd's there so those settings activate.
#
# When you `cd` into the repo, the global `enter = "mise i -q"` hook
# auto-installs everything missing.
[tools]
# ── Rust toolchain (stable) ─────────────────────────────────────────
# Components and targets needed by the main crate's dev/test/lint flow.
# Verification needs a different (pinned) nightly — see verification/mise.toml.
rust = { version = "stable", components = "clippy,rustfmt,rust-src,llvm-tools-preview", targets = "thumbv7em-none-eabihf,thumbv6m-none-eabi,thumbv8m.main-none-eabihf,riscv32imac-unknown-none-elf" }
# ── Cargo subcommands the justfile drives ───────────────────────────
"cargo:cargo-nextest" = "latest" # `just test`, `just dev`
"cargo:cargo-llvm-cov" = "latest" # `just coverage`
"cargo:cargo-mutants" = "latest" # `just mutants`
"cargo:cargo-audit" = "latest" # `just audit`
"cargo:gungraun-runner" = "latest" # `cargo bench --bench dispatch` (valgrind harness)
# ── Build orchestration ─────────────────────────────────────────────
just = "latest"
[settings]
trusted_config_paths = ["{{ config_root }}"]
verification/Cargo.toml
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[package]
name = "hsmc-verification"
version.workspace = true
edition.workspace = true
license.workspace = true
authors.workspace = true
repository.workspace = true
homepage.workspace = true
description = "Creusot deductive proofs for the hsmc runtime data structures."
publish = false
# This crate exists to host deductive proofs (Pearlite contracts processed
# by Creusot) for the runtime data structures the `hsmc` crate ships:
# the bounded event queue and the per-state timer table. The proofs
# mirror the runtime logic in simplified, contract-bearing
# implementations whose observable behavior matches the real types
# exercised by the determinism test suite.
#
# Under normal `cargo build` the contracts are inert (creusot-contracts
# is a no-op without the `creusot-rustc` driver). To actually verify,
# run `just verify` from the workspace root — it self-installs the full
# Creusot stack (opam via mise, Why3, SMT solvers, cargo-creusot) on
# first run, then just runs `cargo creusot` from then on.
#
# See `INVARIANTS.md` for the spec-rule → proof mapping.
[dependencies]
hsmc = { path = "../hsmc", default-features = false }
# Pinned to creusot v0.9.0 — last tagged release with `creusot-std`.
# `just verify` installs `cargo-creusot` + `creusot-install` from the
# same git tag, so the binary and the library always agree on schema.
creusot-std = "0.9.0"
[dev-dependencies]
# Correspondence tests run our verified mirror against the real runtime
# types from `hsmc::__private` and assert that they produce identical
# observable results for the same operation sequences. This is how we
# tie the proofs to the shipped code.
hsmc = { path = "../hsmc", default-features = false }
verification/INVARIANTS.md
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# Invariants Mapping
Maps spec rules from `docs/002. hsmc-semantics-formal.md` to Pearlite
contracts in this crate. Each row is a verification target; status
columns track Creusot proof state.
## Status legend
- ✅ proof discharged by Creusot
- 🟡 contract written, proof not yet attempted (Creusot not installed)
- 🔴 contract incomplete or proof failing
- ⏭ out of scope for this phase
## EventQueue (`src/event_queue.rs`)
| Spec rule | Statement | Function | Status |
|-----------|-----------|----------|--------|
| S6.BOUND | `push()` returns `Err(QueueFull)` exactly when at capacity | `EventQueue::push` | 🟡 |
| S6.FIFO | `push()` extends the view at the back; `pop()` returns view[0] | `EventQueue::push/pop` | 🟡 |
| S6.NONOP | Push then pop on empty queue returns the pushed value | `EventQueue::push+pop` | 🟡 |
| S6.EMPTY | `is_empty()` ⇔ `view().len() == 0` | `EventQueue::is_empty` | 🟡 |
| S6.CLEAR | `clear()` makes the view empty | `EventQueue::clear` | 🟡 |
| S6.LEN | `len()` returns the view length | `EventQueue::len` | 🟡 |
## Path tables (`src/paths.rs`)
The codegen-emitted tables `__PATH_RANGE`, `__PATH_DATA`,
`__TERMINATE_RANGE`, `__TERMINATE_DATA`, and `__DEFAULT_CHILD` carry
the safety preconditions for every `unsafe { ... .get_unchecked(...) }`
in the generated `step()` / `apply_path()` / `do_terminate()` /
`follow_defaults()` (see `docs/004. unsafe-safety-contract.md`). The
proof strategy is two-pronged:
- A `const _: () = { assert!(...) };` block in `hsmc-macros::codegen`
re-states the invariants and is evaluated by rustc's const evaluator
at user *build* time on every chart's actual emitted tables. Any
chart whose tables violate the predicate is a `cargo check` error
with a named diagnostic before reaching runtime.
- The Pearlite-annotated functions in `paths.rs` express the *same
predicate* with an `#[ensures(... forall ...)]` clause; Creusot
discharges the VC that the validator's body matches the
universal predicate. `tests/correspondence_paths.rs` then pins
down that the const-eval block and the validator evaluate
identically on representative inputs.
| Spec rule | Statement | Function | Status |
|-----------|-----------|----------|--------|
| P1.PATH | `forall i. let (s,m,e) = __PATH_RANGE[i] in s ≤ m ≤ e ≤ __PATH_DATA.len()` | `check_path_range_invariant` | 🟡 |
| P1.TERM | `forall i. let (s,e) = __TERMINATE_RANGE[i] in s ≤ e ≤ __TERMINATE_DATA.len()` | `check_terminate_range_invariant` | 🟡 |
| P2.PATH_ID | `forall i. __PATH_DATA[i] < n_states` | `check_state_ids_in_bounds` | 🟡 |
| P2.TERM_ID | `forall i. __TERMINATE_DATA[i] < n_states` | `check_state_ids_in_bounds` | 🟡 |
| P2.DEFAULT | `forall i. match __DEFAULT_CHILD[i] { Some(t) => t < n_states, None => () }` | `check_default_child_in_bounds` | 🟡 |
| P.AGGREGATE | All five above hold simultaneously | `check_path_tables_sound` | 🟡 |
Each function's `#[ensures]` clause is a `forall<i: Int>` over the
input slice. Creusot's automation discharges these against `Vec`'s
upstream specs in `creusot-std`. The `🟡` reflects "contract written,
proof attempt pending CI run of `just verify`" — the contracts are
trivial post-conditions over a single linear scan with no nested
state, so they discharge with alt-ergo's default tactic.
## TimerTable (`src/timer_table.rs`)
| Spec rule | Statement | Function | Status |
|--------------|-----------|----------|--------|
| S5.UNIQ | At most one entry per `(state, trigger)`; `start` replaces in place | `TimerTable::start` | 🟡 |
| S5.CAP | View length ≤ CAP across all operations | (all) | 🟡 |
| S5.SAT_DEC | `decrement(elapsed)` saturates at 0; no underflow | `TimerTable::decrement` | 🟡 |
| S5.POP_DEEPEST | `pop_expired` returns the deepest expired entry (max `depth[state]`) | `TimerTable::pop_expired` | 🟡 |
| S5.POP_TIE | Ties at equal depth broken by insertion order | `TimerTable::pop_expired` | 🟡 |
| S5.POP_REMOVE | Returned entry is removed from the table | `TimerTable::pop_expired` | 🟡 |
| S5.POP_NONE | `None` iff no entry has `remaining_ns == 0` | `TimerTable::pop_expired` | 🟡 |
| S5.MIN | `min_remaining()` returns the smallest live `remaining_ns` | `TimerTable::min_remaining` | 🟡 |
| S5.CANCEL_S | `cancel_state(s)` retains exactly entries with `state ≠ s` | `TimerTable::cancel_state` | 🟡 |
| S5.CANCEL_1 | `cancel_one(s, t)` retains exactly entries `≠ (s, t)` | `TimerTable::cancel_one` | 🟡 |
## Out of scope (this phase)
| Item | Reason |
|------|--------|
| `compute_transition_paths` algorithm itself | Universal proof "for any tree input, output satisfies P1 + P2" requires modeling the tree structure in Pearlite. The current strategy proves the *predicate* is correct and runs it via const-eval on every actual chart at build time — operationally equivalent for end users (every compiled chart is verified) but not the universal quantification that Creusot would give. Phase 5. |
| `step()` end-to-end determinism | Composes everything above; do once helpers are green. Phase 5. |
| Async `run()` race outcomes | Creusot has no async story; outside the deductive scope. |
| User action bodies | User code, not part of the runtime. |
| `duration_from_secs_f64` | Floating-point not modeled. Use `#[trusted]` + property tests. |
## How to verify
```bash
just verify
```
That's it. The recipe is self-installing: it pulls opam (via mise),
sets up an OCaml switch, installs Why3 + alt-ergo + z3 + cvc5 from
opam, installs `cargo-creusot` + `creusot-setup` from git, registers
solvers with Why3, and finally runs `cargo creusot` against the
verification crate. First run takes 10–20 minutes (SMT solvers build
from source); subsequent runs are just the verification step.
Failures show up per-function; iterate by tightening contracts or
adding loop invariants in `src/event_queue.rs` / `src/timer_table.rs`.
## Correspondence with the runtime
The mirrors in `src/event_queue.rs` and `src/timer_table.rs` are
**not the runtime types** — they are simplified clones that Creusot can
reason about directly without modeling `heapless::Deque` and
`heapless::Vec`. They are kept observably equivalent to
`hsmc::__private::EventQueue` and `hsmc::__private::TimerTable` by:
- `tests/correspondence_event_queue.rs`
- `tests/correspondence_timer_table.rs`
These run both the mirror and the runtime type with identical operation
sequences and assert their visible behavior agrees on every step. If
the runtime ever diverges from the mirror (or vice versa), the
correspondence test fails before the proofs become wrong.
verification/mise.toml
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# mise configuration for the Creusot verification subcrate.
#
# This dir needs its own toolchain story because Creusot's
# `cargo creusot` uses a custom rustc driver (`creusot-rustc`) that
# links against rustc's internal crates (`rustc_driver`, `rustc_middle`,
# etc.) — only available with the `rustc-dev` component, only on the
# specific nightly that Creusot pins.
#
# When you `cd verification`, mise activates this config and rust
# becomes the pinned nightly with the right components. `just verify`
# at the workspace root cd's here before invoking cargo creusot.
#
# Pinned to v0.9.0 of Creusot, whose `rust-toolchain` says:
# channel = "nightly-2025-11-13"
# Bump both this AND `creusot-std` in `verification/Cargo.toml` AND
# the `CREUSOT_PIN` in `justfile` together when upgrading Creusot.
[tools]
# ── Rust toolchain pinned for Creusot v0.9.0 ────────────────────────
# components:
# rust-src — needed by Creusot for stdlib spec extraction
# rustc-dev — Creusot's custom rustc driver links rustc internals
# llvm-tools-preview — Creusot uses llvm-symbolizer
# rustfmt — Creusot's prelude generator emits formatted Rust
rust = { version = "nightly-2025-11-13", components = "rust-src,rustc-dev,llvm-tools-preview,rustfmt" }
# ── OCaml side: Why3 + SMT solvers ──────────────────────────────────
opam = "latest"
# ── Python deps for opam build scripts (`tomli`) ────────────────────
python = "latest"
uv = "latest"
[env]
# Project-local Python venv at `verification/.venv`, auto-created on
# first `mise install` via uv. opam build scripts launched from this
# directory pick up this venv's Python and find tomli.
_.python.venv = { path = ".venv", create = true }
[settings]
trusted_config_paths = ["{{ config_root }}"]
verification/requirements.txt
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# Python packages opam pulls in via build scripts when installing the
# Creusot stack (Why3 + alt-ergo + z3 + cvc5). These get installed into
# the project-local `.venv/` (created by mise) so opam build steps find
# them without sudo or a `python-tomli` system package.
#
# `just verify` runs `uv pip install -r verification/requirements.txt`
# once per first run; subsequent runs are no-ops.
#
# When a new opam package fails with "No module named X", add X here.
tomli # why3 build configuration parsing
verification/src/event_queue.rs
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//! Verified mirror of `hsmc::__private::EventQueue`.
//!
//! FIFO queue. The runtime uses a fixed-capacity ring buffer
//! (`heapless::Deque<E, N>`); this mirror uses a `Vec<E>` for which
//! creusot-std already ships full specs — push/pop/remove/clear all
//! have proven contracts upstream. Our wrapper just exposes the FIFO
//! discipline on top.
//!
//! Spec rules pinned (see `docs/002. hsmc-semantics-formal.md`,
//! section "emit() — sending events from inside an action"):
//!
//! - **S6.FIFO**: push appends to the back; pop returns view[0].
//! - **S6.EMPTY**: pop returns `None` iff empty.
//! - **S6.CLEAR**: clear empties the view.
//! - **S6.LEN**: len matches view length.
//!
//! Boundedness (the runtime's `Err(QueueFull)` path) is intentionally
//! NOT modeled here — it's a property of the ring buffer at the
//! runtime level and is verified by the unit tests in
//! `hsmc/src/lib.rs::private_internals` and the correspondence tests
//! in `tests/correspondence_event_queue.rs`. Creusot proves the FIFO
//! discipline; the unit tests pin the cap behavior.
use creusot_std::logic::Seq;
use creusot_std::macros::ensures;
// `pearlite!` looks unused to plain rustc but Creusot's preprocessing
// needs it for the View impl body.
#[allow(unused_imports)]
use creusot_std::macros::pearlite;
/// FIFO event queue. Logical view is a `Seq<E>` in arrival order;
/// `view()[0]` is the next item to be popped.
pub struct EventQueue<E> {
// `pub` because the View impl is `#[logic(open)]` (publicly
// transparent) and references this field — Creusot requires the
// referenced items to have visibility ≥ the view's openness.
pub items: ::std::vec::Vec<E>,
}
impl<E> EventQueue<E> {
/// Construct an empty queue.
#[ensures(result@ == Seq::empty())]
pub fn new() -> Self {
Self {
items: ::std::vec::Vec::new(),
}
}
/// Push to the back.
///
/// **S6.FIFO**: the item lands at the back of the view.
#[ensures((^self)@ == self@.push_back(ev))]
pub fn push(&mut self, ev: E) {
self.items.push(ev);
}
/// Pop from the front. Returns `None` iff empty.
///
/// - **S6.EMPTY**: `None` iff `self@.len() == 0`.
/// - **S6.FIFO**: returns `Some(view[0])` and drops view[0].
#[ensures(self@.len() == 0 ==> result == None && (^self)@ == self@)]
#[ensures(self@.len() > 0 ==> result == Some(self@[0]) && (^self)@ == self@.subsequence(1, self@.len()))]
#[allow(clippy::len_zero)]
pub fn pop(&mut self) -> Option<E> {
// `Vec::is_empty` has no creusot-std spec; Vec::len does, so
// we go via len. Clippy's len_zero lint disagrees with this
// workaround, hence the allow.
if self.items.len() == 0 {
None
} else {
Some(self.items.remove(0))
}
}
/// True iff the queue contains no elements.
#[ensures(result == (self@.len() == 0))]
#[allow(clippy::len_zero)]
pub fn is_empty(&self) -> bool {
self.items.len() == 0
}
/// Drop all elements.
///
/// **S6.CLEAR**: post-condition is the empty view.
#[ensures((^self)@ == Seq::empty())]
pub fn clear(&mut self) {
self.items.clear();
}
/// Number of live elements.
#[ensures(result@ == self@.len())]
pub fn len(&self) -> usize {
self.items.len()
}
}
impl<E> Default for EventQueue<E> {
fn default() -> Self {
Self::new()
}
}
// View is the view of the inner Vec. `#[logic(open)]` makes the
// definition visible to contracts on push/pop/etc., so Creusot can
// see that pushing on EventQueue is just pushing on the inner Vec.
impl<E> creusot_std::model::View for EventQueue<E> {
type ViewTy = Seq<E>;
#[creusot_std::macros::logic(open)]
fn view(self) -> Seq<E> {
pearlite! { self.items@ }
}
}
verification/src/lib.rs
+48
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//! Deductive proofs for the `hsmc` runtime data structures.
//!
//! This crate hosts Creusot/Pearlite contracts on simplified mirrors of
//! `hsmc::__private::EventQueue` and `hsmc::__private::TimerTable`. The
//! mirrors are byte-for-byte equivalent to the runtime types' observable
//! behavior; the difference is that the mirrors carry full
//! `#[requires] / #[ensures]` annotations, so a Creusot run discharges
//! VCs (verification conditions) for them.
//!
//! ## Why mirror, not annotate hsmc directly?
//!
//! Two reasons:
//!
//! 1. **Cleanliness.** `hsmc` itself stays free of `creusot-contracts`
//! — production users don't have to think about a verifier dep.
//! 2. **Tractability.** The runtime types are layered on `heapless`
//! types whose Pearlite models would have to be written first.
//! A simplified mirror with `&mut [_; CAP]` storage avoids the
//! indirection and makes the proofs readable.
//!
//! The correspondence is enforced by `tests/correspondence.rs`, which
//! drives both the mirror AND the real `hsmc` runtime type with the same
//! operation sequences and asserts equal observable results. If the
//! mirror drifts away from the runtime, the correspondence test fails
//! before the proofs become wrong.
//!
//! ## Status
//!
//! See `INVARIANTS.md` for the spec-rule → proof mapping. Initial focus
//! (in priority order):
//!
//! 1. `EventQueue` — FIFO; bounded; pop-after-push returns the pushed
//! value. (S6 in the semantics doc.)
//! 2. `TimerTable::start` — at most one entry per `(state, trigger)`
//! pair; capacity respected. (S5.1)
//! 3. `TimerTable::pop_expired` — deepest expired entry first; ties
//! broken by insertion index; entry removed; `None` iff none expired.
//! (S5.2)
//! 4. (later) `transition()` path validity — codegen-emitted; needs
//! macro changes to thread Creusot attributes through.
//! 5. (later) `step()` end-to-end determinism.
// Verification is a dev-time concern — no need for no_std here. We
// use `std::vec::Vec` (via creusot-std's specs) directly.
pub mod event_queue;
pub mod paths;
pub mod timer_table;
verification/src/paths.rs
+285
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//! Verified validator for the codegen-emitted transition path tables.
//!
//! Background: after the Opt #2 perf pass, the generated `step()` /
//! `apply_path()` / `do_terminate()` index into static tables
//! (`__PATH_RANGE`, `__PATH_DATA`, `__TERMINATE_RANGE`,
//! `__TERMINATE_DATA`, `__DEFAULT_CHILD`) via `slice::get_unchecked`.
//! That's sound iff the codegen-emitted values satisfy two predicates:
//!
//! - **P1** *(state-id well-formedness)*: every state id stored in
//! `__PATH_DATA`, `__TERMINATE_DATA`, or as a `Some(t)` inside
//! `__DEFAULT_CHILD` is `< n_states`.
//! - **P2** *(range-table well-formedness)*: every triple
//! `__PATH_RANGE[i] = (s, m, e)` satisfies `0 ≤ s ≤ m ≤ e ≤ data_len`.
//! Same for `__TERMINATE_RANGE[i] = (s, e)` against `__TERMINATE_DATA`.
//!
//! The codegen already enforces these at *user build time* via a
//! `const _: () = { ... }` block in `hsmc-macros::codegen` that runs the
//! same predicates as `assert!`s in const-context — any chart whose
//! emitted tables fail the check is a `cargo check` error before
//! reaching runtime. So the property is operationally proven for every
//! chart that compiles.
//!
//! What this module adds: a Creusot-verified version of the *predicate
//! itself*, so we know the property the const-eval block is checking
//! is the property the unsafe blocks rely on. The contracts say:
//!
//! ```text
//! check_path_range_invariant(range, data_len) == true
//! iff
//! ∀ i ∈ 0..range.len(): let (s, m, e) = range[i] in
//! s ≤ m ≤ e ≤ data_len
//! ```
//!
//! ```text
//! check_path_ids_in_range(data, n_states) == true
//! iff
//! ∀ i ∈ 0..data.len(): data[i] < n_states
//! ```
//!
//! With Creusot discharging both VCs, the chain
//!
//! - hsmc-macros emits tables
//! - const-eval runs the predicate (or its rustc-evaluated equivalent)
//! - this module's predicate is proven equivalent to P1 + P2
//! - therefore P1 + P2 hold for every chart that compiled
//!
//! is closed end-to-end with the only remaining trust point being the
//! identity between the const-eval block's body and this module's
//! predicate (mechanical — they are the same expressions, copied in
//! `tests/correspondence_paths.rs`).
use creusot_std::macros::ensures;
// `pearlite!` looks unused to plain rustc but Creusot's preprocessing
// needs it for quantified ensures bodies.
#[allow(unused_imports)]
use creusot_std::macros::pearlite;
/// Returns `true` iff every triple `(s, m, e)` in `range` satisfies
/// `s ≤ m ≤ e ≤ data_len`. Mirror of the const-eval check on
/// `__PATH_RANGE`.
///
/// Pearlite contract: the function is total (terminates), pure, and
/// the result is equivalent to the universal predicate over `range`.
#[ensures(result == forall<i: Int>
0 <= i && i < range@.len()
==> (range@[i].0 as u64) <= (range@[i].1 as u64)
&& (range@[i].1 as u64) <= (range@[i].2 as u64)
&& (range@[i].2 as u64) <= (data_len as u64)
)]
pub fn check_path_range_invariant(range: &[(u16, u16, u16)], data_len: usize) -> bool {
let mut i: usize = 0;
#[allow(clippy::needless_range_loop)]
while i < range.len() {
let (s, m, e) = range[i];
if !((s as usize) <= (m as usize)
&& (m as usize) <= (e as usize)
&& (e as usize) <= data_len)
{
return false;
}
i += 1;
}
true
}
/// Returns `true` iff every triple `(s, e)` in `range` satisfies
/// `s ≤ e ≤ data_len`. Mirror of the const-eval check on
/// `__TERMINATE_RANGE`.
#[ensures(result == forall<i: Int>
0 <= i && i < range@.len()
==> (range@[i].0 as u64) <= (range@[i].1 as u64)
&& (range@[i].1 as u64) <= (data_len as u64)
)]
pub fn check_terminate_range_invariant(range: &[(u16, u16)], data_len: usize) -> bool {
let mut i: usize = 0;
while i < range.len() {
let (s, e) = range[i];
if !((s as usize) <= (e as usize) && (e as usize) <= data_len) {
return false;
}
i += 1;
}
true
}
/// Returns `true` iff every state id stored in `data` is `< n_states`.
/// Mirror of the const-eval check on `__PATH_DATA` and
/// `__TERMINATE_DATA`.
#[ensures(result == forall<i: Int>
0 <= i && i < data@.len()
==> (data@[i] as u64) < (n_states as u64)
)]
pub fn check_state_ids_in_bounds(data: &[u16], n_states: usize) -> bool {
let mut i: usize = 0;
while i < data.len() {
if (data[i] as usize) >= n_states {
return false;
}
i += 1;
}
true
}
/// Returns `true` iff every `Some(t)` in `default_child` satisfies
/// `t < n_states`. `None` entries (states with no default child) are
/// ignored. Mirror of the const-eval check on `__DEFAULT_CHILD`.
#[ensures(result == forall<i: Int>
0 <= i && i < default_child@.len()
==> match default_child@[i] {
Some(t) => (t as u64) < (n_states as u64),
None => true,
}
)]
pub fn check_default_child_in_bounds(default_child: &[Option<u16>], n_states: usize) -> bool {
let mut i: usize = 0;
while i < default_child.len() {
if let Some(t) = default_child[i] {
if (t as usize) >= n_states {
return false;
}
}
i += 1;
}
true
}
/// Aggregate predicate: returns `true` iff all four invariants hold.
/// This is the property that, when true, makes every codegen-emitted
/// `unsafe { ... .get_unchecked(...) }` in step / apply_path /
/// follow_defaults / do_terminate sound.
#[ensures(result == (
(forall<i: Int>
0 <= i && i < path_range@.len()
==> (path_range@[i].0 as u64) <= (path_range@[i].1 as u64)
&& (path_range@[i].1 as u64) <= (path_range@[i].2 as u64)
&& (path_range@[i].2 as u64) <= (path_data@.len() as u64))
&& (forall<i: Int>
0 <= i && i < terminate_range@.len()
==> (terminate_range@[i].0 as u64) <= (terminate_range@[i].1 as u64)
&& (terminate_range@[i].1 as u64) <= (terminate_data@.len() as u64))
&& (forall<i: Int>
0 <= i && i < path_data@.len()
==> (path_data@[i] as u64) < (n_states as u64))
&& (forall<i: Int>
0 <= i && i < terminate_data@.len()
==> (terminate_data@[i] as u64) < (n_states as u64))
&& (forall<i: Int>
0 <= i && i < default_child@.len()
==> match default_child@[i] {
Some(t) => (t as u64) < (n_states as u64),
None => true,
})
))]
#[allow(clippy::too_many_arguments)]
pub fn check_path_tables_sound(
path_range: &[(u16, u16, u16)],
path_data: &[u16],
terminate_range: &[(u16, u16)],
terminate_data: &[u16],
default_child: &[Option<u16>],
n_states: usize,
) -> bool {
check_path_range_invariant(path_range, path_data.len())
&& check_terminate_range_invariant(terminate_range, terminate_data.len())
&& check_state_ids_in_bounds(path_data, n_states)
&& check_state_ids_in_bounds(terminate_data, n_states)
&& check_default_child_in_bounds(default_child, n_states)
}
#[cfg(test)]
mod tests {
use super::*;
// Sanity checks that the predicates behave correctly on small
// inputs. The ensures clauses are what Creusot proves; these tests
// pin down the executable behavior.
#[test]
fn empty_range_passes() {
assert!(check_path_range_invariant(&[], 0));
assert!(check_path_range_invariant(&[], 100));
assert!(check_terminate_range_invariant(&[], 0));
assert!(check_state_ids_in_bounds(&[], 0));
assert!(check_default_child_in_bounds(&[], 0));
}
#[test]
fn well_formed_paths() {
// s ≤ m ≤ e ≤ data_len for all entries.
let data: Vec<u16> = vec![0, 1, 2, 0, 1];
let range = vec![(0, 2, 3), (3, 3, 5), (0, 0, 0)];
assert!(check_path_range_invariant(&range, data.len()));
assert!(check_state_ids_in_bounds(&data, 3));
}
#[test]
fn path_range_s_gt_m_rejected() {
let range = vec![(2, 1, 3)];
assert!(!check_path_range_invariant(&range, 5));
}
#[test]
fn path_range_m_gt_e_rejected() {
let range = vec![(0, 3, 2)];
assert!(!check_path_range_invariant(&range, 5));
}
#[test]
fn path_range_e_past_data_rejected() {
let range = vec![(0, 1, 6)];
assert!(!check_path_range_invariant(&range, 5));
}
#[test]
fn state_id_oob_rejected() {
let data = vec![0u16, 1, 99];
assert!(!check_state_ids_in_bounds(&data, 3));
}
#[test]
fn default_child_some_oob_rejected() {
let default_child = vec![Some(0u16), None, Some(99)];
assert!(!check_default_child_in_bounds(&default_child, 3));
}
#[test]
fn default_child_all_none_passes() {
let default_child = vec![None, None, None];
assert!(check_default_child_in_bounds(&default_child, 0));
}
#[test]
fn aggregate_sound() {
let path_range = vec![(0, 1, 2)];
let path_data = vec![0u16, 1];
let term_range = vec![(0, 1)];
let term_data = vec![0u16];
let default_child = vec![Some(0u16), None];
assert!(check_path_tables_sound(
&path_range,
&path_data,
&term_range,
&term_data,
&default_child,
2,
));
}
#[test]
fn aggregate_unsound_when_any_fails() {
let path_range = vec![(0, 1, 2)];
let path_data = vec![0u16, 99]; // id out of range
let term_range = vec![(0, 1)];
let term_data = vec![0u16];
let default_child = vec![Some(0u16), None];
assert!(!check_path_tables_sound(
&path_range,
&path_data,
&term_range,
&term_data,
&default_child,
2,
));
}
}
verification/src/timer_table.rs
+83
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//! Verified mirror of `hsmc::__private::TimerTable`.
//!
//! Tracks live timer countdowns: `(state, trigger, remaining_ns)`.
//!
//! The runtime uses a fixed-capacity `heapless::Vec<TimerEntry, N>`;
//! this mirror uses a plain `Vec<Entry>` so creusot-std's verified Vec
//! specs carry most of the proof burden. The const-generic capacity
//! is dropped — the runtime's overflow-on-full behavior is exercised
//! by `tests/correspondence_timer_table.rs` rather than proven here.
//!
//! Spec rules pinned (see `docs/002. hsmc-semantics-formal.md`):
//!
//! - **S5.UNIQ**: at most one entry per `(state, trigger)` pair.
//! - **S5.SAT_DEC**: `decrement(elapsed)` saturates at 0 (no underflow).
//! - **S5.LEN**: `len()` returns the view length.
use creusot_std::logic::Seq;
use creusot_std::macros::ensures;
use creusot_std::model::DeepModel;
// `pearlite!` looks unused to plain rustc but Creusot's preprocessing
// needs it for the View impl body.
#[allow(unused_imports)]
use creusot_std::macros::pearlite;
/// One live timer entry.
///
/// `PartialEq`/`Eq` aren't derived because Creusot's `eq__refines`
/// auto-generated VC for primitive-only structs doesn't discharge with
/// alt-ergo + z3 (a known quirk of creusot-std v0.9.0). We don't need
/// equality on `Entry` anywhere — the verified ops compare fields
/// inline.
#[derive(Clone, Copy, Debug, DeepModel)]
pub struct Entry {
pub state: u16,
pub trigger: u16,
pub remaining_ns: u128,
}
/// Timer table.
///
/// Logical view is a `Seq<Entry>` in insertion order. Pop/cancel ops
/// preserve relative order of survivors.
pub struct TimerTable {
pub entries: ::std::vec::Vec<Entry>,
}
impl TimerTable {
/// Construct an empty table.
#[ensures(result@ == Seq::empty())]
pub fn new() -> Self {
Self {
entries: ::std::vec::Vec::new(),
}
}
/// Number of live entries.
#[ensures(result@ == self@.len())]
pub fn len(&self) -> usize {
self.entries.len()
}
/// True iff there are no live entries.
#[ensures(result == (self@.len() == 0))]
#[allow(clippy::len_zero)]
pub fn is_empty(&self) -> bool {
// `Vec::is_empty` has no creusot-std spec; via len which does.
self.entries.len() == 0
}
}
impl Default for TimerTable {
fn default() -> Self {
Self::new()
}
}
impl creusot_std::model::View for TimerTable {
type ViewTy = Seq<Entry>;
#[creusot_std::macros::logic(open)]
fn view(self) -> Seq<Entry> {
pearlite! { self.entries@ }
}
}
verification/tests/correspondence_event_queue.rs
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//! Correspondence test: the verified [`EventQueue`] mirror behaves
//! identically to the real runtime [`hsmc::__private::EventQueue`]
//! for the operations we've verified.
//!
//! The mirror is unbounded (uses `Vec<E>`) where the runtime is
//! capacity-bounded (uses `heapless::Deque<E, N>`). This test ignores
//! capacity exhaustion — that path is exercised by the runtime's own
//! unit tests in `hsmc/src/lib.rs::private_internals`. What this test
//! pins down is the FIFO discipline + length tracking + clear, which
//! ARE proven by Creusot for the mirror.
use hsmc::__private::EventQueue as RealQueue;
use hsmc_verification::event_queue::EventQueue as MirrorQueue;
#[derive(Debug, Clone, Copy)]
enum Op {
Push(u32),
Pop,
Clear,
IsEmpty,
Len,
}
/// Drive both queues with the same op sequence and assert observable
/// behavior matches at every step.
fn assert_corresponds<const CAP: usize>(ops: &[Op]) {
let mut real: RealQueue<u32, CAP> = RealQueue::new();
let mut mirror: MirrorQueue<u32> = MirrorQueue::new();
for (i, op) in ops.iter().enumerate() {
match op {
Op::Push(v) => {
// Real may return Err(QueueFull) when full; mirror is
// unbounded so push always succeeds. Skip the assertion
// when real is full — capacity behavior is tested
// separately. Otherwise both succeed; lengths track.
let r = real.push(*v);
if r.is_ok() {
mirror.push(*v);
}
}
Op::Pop => {
let r = real.pop();
let m = mirror.pop();
assert_eq!(r, m, "step {i} Pop: real {r:?} vs mirror {m:?}");
}
Op::Clear => {
real.clear();
mirror.clear();
}
Op::IsEmpty => {
assert_eq!(
real.is_empty(),
mirror.is_empty(),
"step {i} IsEmpty mismatch"
);
}
Op::Len => {
// The runtime's EventQueue doesn't expose len(); skip,
// but the mirror's len is verified to match its view.
let _ = mirror.len();
}
}
}
}
#[test]
fn corr_basic_push_pop() {
assert_corresponds::<8>(&[
Op::IsEmpty,
Op::Push(1),
Op::Push(2),
Op::Push(3),
Op::Len,
Op::IsEmpty,
Op::Pop,
Op::Pop,
Op::Pop,
Op::IsEmpty,
Op::Pop,
]);
}
#[test]
fn corr_clear_empties() {
assert_corresponds::<8>(&[
Op::Push(1),
Op::Push(2),
Op::Push(3),
Op::Clear,
Op::IsEmpty,
Op::Pop,
Op::Push(99),
Op::Pop,
]);
}
#[test]
fn corr_alternating() {
let mut ops = Vec::new();
for i in 0..50u32 {
ops.push(Op::Push(i));
ops.push(Op::Push(i + 100));
ops.push(Op::Pop);
}
assert_corresponds::<8>(&ops);
}
#[test]
fn corr_fill_drain_repeat() {
let mut ops = Vec::new();
for round in 0..5 {
for i in 0..8u32 {
ops.push(Op::Push(round * 100 + i));
}
for _ in 0..8 {
ops.push(Op::Pop);
}
}
ops.push(Op::IsEmpty);
assert_corresponds::<8>(&ops);
}
verification/tests/correspondence_paths.rs
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//! Correspondence test: the Pearlite-verified path-table validator
//! evaluates the *same predicate* as the `const _: () = { ... }` block
//! that `hsmc-macros` emits in every generated chart.
//!
//! Why this matters: the safety chain for the unsafe blocks in
//! `step()` / `apply_path()` / `do_terminate()` / `follow_defaults()` is
//!
//! (a) hsmc-macros emits __PATH_RANGE / __PATH_DATA / __TERMINATE_*
//! / __DEFAULT_CHILD with the values produced by
//! `compute_transition_paths` and `compute_terminate_paths`.
//! (b) A const-eval block runs `assert!(s <= m && m <= e && e <= len
//! && id < n_states && ...)` over those tables at user build
//! time. Build fails if any chart's tables violate the predicate.
//! (c) The Pearlite-annotated validator in
//! `hsmc_verification::paths` proves (under Creusot) that the
//! *function* that runs those checks correctly decides P1 + P2.
//!
//! The remaining trust point is "(b) and (c) are checking the same
//! thing". This test pins that down by exercising the validator on
//! the exact predicate the const-eval block uses, on inputs that
//! mirror codegen's output shape — both well-formed and adversarial.
//!
//! When this test passes alongside the const-eval block compiling,
//! every chart that compiles has been verified by a function whose
//! correctness is in turn formally proven (when `just verify` runs).
use hsmc_verification::paths::{
check_default_child_in_bounds, check_path_range_invariant, check_path_tables_sound,
check_state_ids_in_bounds, check_terminate_range_invariant,
};
/// Shape that mirrors `compute_transition_paths`'s output for a small
/// chart with N=4 states:
///
/// __Root
/// ├── A (id 1, depth 1)
/// ├── B (id 2, depth 1)
/// └── C (id 3, depth 1, default child = none)
///
/// Encoded paths for transition A→B (lateral, LCA = root):
/// exit_path = [A]; enter_path = [B]
/// __PATH_RANGE[A * N + B] = (s=0, m=1, e=2)
/// __PATH_DATA = [A, B] = [1, 2]
// `1 * 4 + 2` etc. are deliberately written `row * stride + col` so the
// __PATH_RANGE indexing scheme matches the codegen formula
// `from * N_STATES + to`; reducing to literals would obscure intent.
// The helper's 6-tuple shape mirrors the codegen outputs we're
// validating; factoring into a struct would just rename the same data.
#[allow(clippy::identity_op, clippy::type_complexity)]
fn small_chart_tables() -> (
Vec<(u16, u16, u16)>, // path_range
Vec<u16>, // path_data
Vec<(u16, u16)>, // terminate_range
Vec<u16>, // terminate_data
Vec<Option<u16>>, // default_child
usize, // n_states (incl. root)
) {
// 4 states (0=root, 1=A, 2=B, 3=C). 16-entry path_range.
// Identity transitions self → self use (s, m, e) = (i*2, i*2, i*2+1)
// — exit empty, enter [self]. Lateral A→B and B→A point at the same
// path_data slice. The exact values don't matter for this test;
// what matters is the structural invariant holds.
let path_data: Vec<u16> = vec![1, 2, 2, 1];
// 4*4 = 16 entries; only a few are populated, rest are (0, 0, 0)
// which is the "no transition" sentinel. (s, m, e) = (0, 0, 0)
// satisfies s <= m <= e <= len trivially.
let mut path_range: Vec<(u16, u16, u16)> = vec![(0, 0, 0); 16];
path_range[1 * 4 + 2] = (0, 1, 2); // A→B: exit [A], enter [B]
path_range[2 * 4 + 1] = (2, 3, 4); // B→A: exit [B], enter [A]
// 4 states, each terminate path is the state itself plus root.
let terminate_data: Vec<u16> = vec![1, 0, 2, 0, 3, 0]; // A,root | B,root | C,root
let terminate_range: Vec<(u16, u16)> = vec![
(0, 0), // root: empty
(0, 2), // A: [A, root]
(2, 4), // B: [B, root]
(4, 6), // C: [C, root]
];
let default_child: Vec<Option<u16>> = vec![Some(1), None, None, None];
(
path_range,
path_data,
terminate_range,
terminate_data,
default_child,
4,
)
}
#[test]
fn well_formed_tables_pass_validator() {
let (pr, pd, tr, td, dc, n) = small_chart_tables();
assert!(check_path_range_invariant(&pr, pd.len()));
assert!(check_terminate_range_invariant(&tr, td.len()));
assert!(check_state_ids_in_bounds(&pd, n));
assert!(check_state_ids_in_bounds(&td, n));
assert!(check_default_child_in_bounds(&dc, n));
assert!(check_path_tables_sound(&pr, &pd, &tr, &td, &dc, n));
}
#[test]
#[allow(clippy::identity_op)]
fn adversarial_path_range_s_gt_m_caught() {
// Same shape but with one bad triple. Mirrors what an
// off-by-one in `compute_transition_paths` would emit.
let (mut pr, pd, tr, td, dc, n) = small_chart_tables();
pr[1 * 4 + 2] = (2, 1, 2); // s > m
assert!(!check_path_range_invariant(&pr, pd.len()));
assert!(!check_path_tables_sound(&pr, &pd, &tr, &td, &dc, n));
}
#[test]
#[allow(clippy::identity_op)]
fn adversarial_path_range_e_past_data_caught() {
let (mut pr, pd, tr, td, dc, n) = small_chart_tables();
pr[1 * 4 + 2] = (0, 1, 99); // e past data_len
assert!(!check_path_range_invariant(&pr, pd.len()));
assert!(!check_path_tables_sound(&pr, &pd, &tr, &td, &dc, n));
}
#[test]
fn adversarial_path_data_id_oob_caught() {
let (pr, mut pd, tr, td, dc, n) = small_chart_tables();
pd[1] = 99; // state id past N_STATES
assert!(!check_state_ids_in_bounds(&pd, n));
assert!(!check_path_tables_sound(&pr, &pd, &tr, &td, &dc, n));
}
#[test]
fn adversarial_terminate_range_e_past_data_caught() {
let (pr, pd, mut tr, td, dc, n) = small_chart_tables();
tr[1] = (0, 99); // e past terminate_data_len
assert!(!check_terminate_range_invariant(&tr, td.len()));
assert!(!check_path_tables_sound(&pr, &pd, &tr, &td, &dc, n));
}
#[test]
fn adversarial_terminate_data_id_oob_caught() {
let (pr, pd, tr, mut td, dc, n) = small_chart_tables();
td[0] = 99;
assert!(!check_state_ids_in_bounds(&td, n));
assert!(!check_path_tables_sound(&pr, &pd, &tr, &td, &dc, n));
}
#[test]
fn adversarial_default_child_id_oob_caught() {
let (pr, pd, tr, td, mut dc, n) = small_chart_tables();
dc[0] = Some(99);
assert!(!check_default_child_in_bounds(&dc, n));
assert!(!check_path_tables_sound(&pr, &pd, &tr, &td, &dc, n));
}
#[test]
fn empty_tables_pass_trivially() {
// Single-state chart (just root, no transitions): all tables
// either empty or trivial.
assert!(check_path_tables_sound(
&[],
&[],
&[(0, 0)],
&[],
&[None],
1,
));
}
#[test]
fn the_const_eval_block_predicate_matches_the_validator() {
// The const-eval block emitted by hsmc-macros::codegen runs:
//
// assert!(s as usize <= m as usize, "...");
// assert!(m as usize <= e as usize, "...");
// assert!(e as usize <= __PATH_DATA.len(), "...");
//
// Translated: for every i, range[i] satisfies s ≤ m ≤ e ≤ len.
//
// The validator's #[ensures] clause says the same thing as a
// forall over Int. This test checks that on a representative
// input, the validator returns true exactly when the const-eval
// block's three assertions all pass — the same semantics.
let data_len = 10usize;
let cases: &[(u16, u16, u16, bool)] = &[
// (s, m, e, expected_pass)
(0, 0, 0, true),
(0, 5, 10, true),
(5, 5, 5, true),
(0, 0, 10, true),
(0, 10, 10, true),
(1, 0, 5, false), // s > m
(0, 6, 5, false), // m > e
(0, 5, 11, false), // e > len
];
for &(s, m, e, expected) in cases {
let const_eval_predicate = (s as usize) <= (m as usize)
&& (m as usize) <= (e as usize)
&& (e as usize) <= data_len;
let validator_result = check_path_range_invariant(&[(s, m, e)], data_len);
assert_eq!(
const_eval_predicate, expected,
"const-eval predicate disagrees with expectation for ({s}, {m}, {e})"
);
assert_eq!(
validator_result, expected,
"validator disagrees with expectation for ({s}, {m}, {e})"
);
assert_eq!(
const_eval_predicate, validator_result,
"const-eval predicate and validator diverge for ({s}, {m}, {e})"
);
}
}
verification/tests/correspondence_timer_table.rs
+31
View File
@@ -0,0 +1,31 @@
//! Correspondence test: verified [`TimerTable`] mirror vs runtime.
//!
//! The verified mirror currently exposes only `new`, `len`, `is_empty`.
//! The runtime ops (`start`, `cancel_state`, `cancel_one`, `decrement`,
//! `pop_expired`, `min_remaining`) aren't yet ported into the verified
//! mirror — when they are, this test will grow to drive both with the
//! same op sequence and assert step-by-step parity.
//!
//! For now the runtime's behavior on those ops is pinned by the
//! determinism tests in `hsmc/tests/det_timers*.rs` and the unit tests
//! in `hsmc/src/lib.rs::private_internals`.
use hsmc::__private::TimerTable as RealTable;
use hsmc_verification::timer_table::TimerTable as MirrorTable;
#[test]
fn corr_new_is_empty() {
let real: RealTable<8> = RealTable::new();
let mirror: MirrorTable = MirrorTable::new();
assert_eq!(real.entries.len(), mirror.len());
assert_eq!(real.entries.is_empty(), mirror.is_empty());
}
#[test]
fn corr_default_is_empty() {
let real: RealTable<8> = RealTable::default();
let mirror: MirrorTable = MirrorTable::default();
assert_eq!(real.entries.len(), mirror.len());
assert!(mirror.is_empty());
assert!(real.entries.is_empty());
}