feat(minivm): register VM bytecode pipeline + debugger (Phase 0/1) by cuzzo · Pull Request #35 · cuzzo/clear

cuzzo · 2026-05-09T16:04:37Z

Summary

Brings the register VM onto current master (post-hotfix-master-bugs merge) and lands the first two coverage unlocks of the pre-v0.1 bug-finding sprint. The VM is the primary stress-tester for the transpiler — every test category it can run shakes out fresh transpiler bugs.

Status: baseline raised 175 → 189 / 243 register-VM allowlist tests, gated in CI.

Commits

cf1beac2 feat(minivm): register VM bytecode pipeline + debugger + golden tests — the VM itself: bc_emitter, runtime, vm.cht template, byebug-style debugger, time-travel scaffolding, 90+ golden tests, 20 cross-language benchmarks. Plus the small compiler hooks the :bc target needs (MIR source-line metadata, MIR::Let alias_safe, CompiledModule mir_items field, byteAt builtin, bare T[N] MUTABLE syntax).
763933d4 ci(minivm): gate PRs on register-VM allowlist baseline — adds --min-pass=N ratchet to examples/minivm/run_tests.rb and a new CI job that fails on any regression below the current pass count. Bump --min-pass=N as we land coverage work.
0afef11c feat(minivm): skip InlineZig equality assert lowering for :bc target — the bytecode VM cannot run raw Zig, so try_lower_equality_assert (which produces MIR::InlineZig calling std.testing.expectEqual*) left every ASSERT a == b test PENDING. Skip when @target == :bc so the condition flows through CheatLib.assert. +11 tests passing.
e8a74c71 feat(minivm): unwrap UnionSchema when collecting cross-file variants — collect_type_defs iterated union_schemas assuming raw { variant => Type } hashes, but master's typed-cleanup work wrapped them in Schemas::UnionSchema. Normalize to schema.variants if available. +3 tests passing.

Test plan

bundle exec prspec spec/ — 4712 specs, 0 failures
./clear test transpile-tests/ — 540 passed, 0 leaks
bundle exec ruby examples/minivm/run_tests.rb --vm=register --min-pass=189 — baseline gate green
CI register-vm-allowlist job passes on PR

Why this matters

The VM is on track to expose more transpiler bugs as coverage grows. The hotfix-master-bugs branch (already merged) was 13 fixes that came from running the VM against transpile-tests; the next phases of this sprint will surface more.

Each coverage unlock here gates merge on the new baseline so future PRs can't silently regress what's already working.

🤖 Generated with Claude Code

github-actions · 2026-05-09T16:06:00Z

Bencher Report

Branch	register-machine
Testbed	ubuntu-latest

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Benchmark	leak-build-ms	Measure (units) x 1e3	leak-count	leak-run-ms	Measure (units)
benchmarks/concurrent/04_fanout_fanin/bench	📈 view plot ⚠️ NO THRESHOLD	5.49 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	3,315.21 units
benchmarks/concurrent/09_kvstore/bench	📈 view plot ⚠️ NO THRESHOLD	5.41 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	60,003.74 units
benchmarks/concurrent/14_nested_lock/bench	📈 view plot ⚠️ NO THRESHOLD	5.29 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	391.29 units
benchmarks/inter-clear/02_concurrent_fsm_vs_stackful/bench_fsm	📈 view plot ⚠️ NO THRESHOLD	5.21 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	151.21 units
benchmarks/inter-clear/02_concurrent_fsm_vs_stackful/bench_stackful	📈 view plot ⚠️ NO THRESHOLD	5.23 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	195.09 units
benchmarks/sequential/11_pipeline_overhead/bench	📈 view plot ⚠️ NO THRESHOLD	5.22 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	12,495.82 units

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codecov-commenter · 2026-05-09T16:06:15Z

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Codecov Report

❌ Patch coverage is 65.21739% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.78%. Comparing base (6fd7e89) to head (f1c5236).

Files with missing lines	Patch %	Lines
src/ast/parser.rb	44.82%	16 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   92.83%   92.78%   -0.05%     
==========================================
  Files         206      206              
  Lines       52596    52636      +40     
  Branches    12325    12343      +18     
==========================================
+ Hits        48829    48840      +11     
- Misses       3767     3796      +29

Flag	Coverage Δ
fuzz	`46.18% <58.69%> (+<0.01%)`	⬆️
ruby	`90.71% <65.21%> (-0.08%)`	⬇️
transpile-tests	`82.06% <60.86%> (-0.04%)`	⬇️
zig	`96.39% <ø> (ø)`

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@list

Brings over the register-VM work onto current master (post-hotfix). The compiler/MIR pre-reqs now landed via the hotfix branch are already in place (PipelineHost, IfBind defensive lookups, cross-file FunctionSignature reconstruction, items_access pointer-deref, CheatLib polymorphic helpers, @enumFromInt CAST, K[]@list keys(), fixed-array literal storage, raw fixed-array indexed-set, setAt / cleanupAt / join pointer-deref). This commit adds: VM emitter and runtime - examples/minivm/register_bc_emitter.rb — register-allocated bytecode emitter with shared-event recording groundwork for future loom - examples/minivm/_bc_runner.cht — Zig-compiled register VM with byebug-style debugger (breakpoints, step, frame, time-travel) - examples/minivm/vm.cht — VM template using bare T[N] register files - 90+ golden harness tests under examples/minivm/vm-tests/ - 20 cross-language VM benchmarks under benchmarks/vm/ Compiler hooks needed to drive the :bc target - src/mir/mir.rb: MIR::Stmt#source_line / source_column for debugger attribution; MIR::Let#alias_safe field for bc emitter aliasing hints - src/mir/mir_lowering.rb: stamp_source_line! propagates AST source positions through lowered MIR - src/backends/importer.rb: CompiledModule.mir_items field for cross-file MIR access from the bc emitter; attr_reader :module_cache - src/ast/std_lib.rb: byteAt builtin (O(1) byte-level numeric access) - zig/runtime/runtime-header.zig: CheatLib.byteAt impl Bare T[N] MUTABLE syntax (used by VM register-file declarations) - src/ast/parser.rb: parse_mutable_var_decl handles `MUTABLE x: T[N];` with synthesized zero-defaults for primitive element types - src/ast/diagnostic_registry.rb: 3 new MUTABLE_BARE_* codes 5 RSpec files under spec/minivm_*_spec.rb cover golden harness, debugger, source-line attribution, file limits, and pipeline lowering. Baseline: 4712 specs / 539 transpile-tests / 0 leaks; register-VM allowlist 175/243 (see register-transpile-allowlist.txt for the roadmap of remaining work).

The register VM has already proven its value as a transpiler bug- finder: stress-testing it against transpile-tests surfaced 13 master bugs that landed as the hotfix-master-bugs branch. Lock that signal in by gating every PR on a baseline ratchet — no regression below the current pass count. Adds: - `--min-pass=N` flag to examples/minivm/run_tests.rb. The runner exits 0 if `passed >= N` regardless of pending/failed counts; exits 1 (with "baseline REGRESSION" message) if it slips below. This is the ratchet: bump N as we land coverage work that crosses tests fail->pass. - New CI job `register-vm-allowlist` after transpile-tests, sharing the clear-cache key for warm builds. Initial baseline: 175/243. Side effect: the runner's old all-pass-or-failure semantics (`failed.zero? && pending.zero?`) is preserved structurally but strict-mode callers should now use `run_vm_target_suite_with_count` + explicit predicate. The default `--vm=register` invocation still returns the pass count and exits 0 if any tests pass.

The bytecode VM cannot execute raw Zig, so `try_lower_equality_assert` (which produces a `MIR::InlineZig` calling `std.testing.expectEqual*`) left every `ASSERT a == b` test PENDING with reason "register emitter does not support MIR::InlineZig stmt assert_eq_*". Skip the equality-assert lowering when `@target == :bc` so the condition flows through the existing `lower(node.condition)` + `CheatLib.assert` path. Failure messages are slightly less rich than `expectEqualStrings`'s structured diff, but the tests run. Also bumps the CI register-VM baseline 175 → 186 (15 PENDING tests resolved: 11 PASS + 4 fail/missing on real correctness issues that the bc emitter now reaches and exposes). Found by VM stress-test against the transpile-tests corpus.

`collect_type_defs` iterated `@frontend_result.union_schemas` with the assumption that each value is a raw `{ variant_name => Type }` hash. Master's typed-cleanup work wrapped these in `Schemas::UnionSchema` objects, which expose the hash via a `.variants` accessor rather than being one. Result: `undefined method 'map' for #<Schemas::UnionSchema>` on any test that defines a generic union (e.g. `UNION Optional<T> { Some: T, None }`) and matches it across file boundaries. Normalize to `schema.variants` if available, fall back to the raw hash otherwise (older importer paths still produce the latter). Found by VM stress-test: 57_match_union_capture; baseline 186 -> 189.

The FSM transform consumes a BG body into Zig text and leaves `run_body=[]` in the resulting `MIR::BgBlock`. The bc emitter cannot walk Zig text; it needs structured MIR. Without this guard, every BG block test failed with `register emitter requires structured run_body for BgBlock`. Skip the transform when `@target == :bc` so the legacy stackful- fiber lowering populates run_body with the actual MIR of the body. The bc VM is single-threaded, so synchronous inline execution of the body is the correct semantics for `BG { ... }` -- the future loom-mode scheduler (the `record_shared_event` scaffolding already present) will exhaust interleavings later, but for now we just run each BG body inline. This was in the original 72-commit register-machine branch but got lost when I rebuilt the branch cleanly on the current master. Bumps CI baseline 189 -> 215. The 26 newly-passing tests cover BG basics (58_bg, 59_bg_concurrent), bounded streams, BG STREAM, and the FSM-with-suspend / FSM-multi-cap test cluster -- exactly the PENDING block from the previous report. ALL 29 PENDING tests in the allowlist resolved (0 PENDING remain); 26 PASS + 3 surfaced new failures that the bc emitter now reaches.

After hotfix-stack-check-require lands (importer fix + huge-frame prologue verifier fix), the bc-VM register allowlist passes 238 of 243 tests. Lock the new floor. Remaining 5 are not memory corruption -- 1 lower_where Sorbet sig issue, 1 UTF-8 encoding mismatch, 3 missing test files (allowlist drift). Tracked separately. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

github-actions · 2026-05-11T23:38:38Z

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Branch	register-machine
Testbed	ubuntu-latest

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Benchmark	leak-build-ms	Measure (units) x 1e3	leak-count	leak-run-ms	Measure (units)
benchmarks/concurrent/02_concurrent_search/bench	📈 view plot ⚠️ NO THRESHOLD	1.30 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	5.35 units
benchmarks/concurrent/07_stream_merge/bench	📈 view plot ⚠️ NO THRESHOLD	1.15 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	28.96 units
benchmarks/concurrent/12_false_sharing/bench	📈 view plot ⚠️ NO THRESHOLD	1.19 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,084.23 units
benchmarks/concurrent/19_atomic_ptr/bench	📈 view plot ⚠️ NO THRESHOLD	1.16 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	117.10 units
benchmarks/inter-clear/05_concurrent_mvcc_pure_read/bench	📈 view plot ⚠️ NO THRESHOLD	1.16 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	683.14 units
benchmarks/sequential/04_hashmap/bench	📈 view plot ⚠️ NO THRESHOLD	1.30 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,748.58 units
benchmarks/sequential/09_frame_vs_heap/bench	📈 view plot ⚠️ NO THRESHOLD	1.10 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,358.84 units
benchmarks/sequential/14_iterator/bench	📈 view plot ⚠️ NO THRESHOLD	1.11 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	279.19 units

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github-actions · 2026-05-11T23:39:02Z

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Branch	register-machine
Testbed	ubuntu-latest

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Benchmark	leak-build-ms	Measure (units) x 1e3	leak-count	leak-run-ms	Measure (units)
benchmarks/concurrent/03_atomic_contention/bench	📈 view plot ⚠️ NO THRESHOLD	4.86 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	53.22 units
benchmarks/concurrent/08_pubsub/bench	📈 view plot ⚠️ NO THRESHOLD	4.80 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	2,881.69 units
benchmarks/concurrent/13_rwlock_starvation/bench	📈 view plot ⚠️ NO THRESHOLD	4.86 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,029.97 units
benchmarks/inter-clear/06_concurrent_mvcc_writer_pressure/bench	📈 view plot ⚠️ NO THRESHOLD	4.85 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,204.17 units
benchmarks/sequential/05_string_builder/bench	📈 view plot ⚠️ NO THRESHOLD	4.62 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	23,123.10 units
benchmarks/sequential/10_pool_vs_multiowned/bench	📈 view plot ⚠️ NO THRESHOLD	4.62 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	632.62 units
benchmarks/server/01_tcp_kvstore/server	📈 view plot ⚠️ NO THRESHOLD	4.85 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,002.38 units

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github-actions · 2026-05-11T23:39:04Z

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Testbed	ubuntu-latest

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Benchmark	leak-build-ms	Measure (units) x 1e3	leak-count	leak-run-ms	Measure (units)
benchmarks/concurrent/01_socket_throughput/bench	📈 view plot ⚠️ NO THRESHOLD	5.38 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,442.08 units
benchmarks/concurrent/06_dynamic_spawn/bench	📈 view plot ⚠️ NO THRESHOLD	5.22 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	3,684.60 units
benchmarks/concurrent/11_parallel_aggregation/bench	📈 view plot ⚠️ NO THRESHOLD	5.30 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	7,344.67 units
benchmarks/concurrent/18_atomic_counter/bench	📈 view plot ⚠️ NO THRESHOLD	5.21 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	45.70 units
benchmarks/inter-clear/04_concurrent_mvcc_fat_struct/bench	📈 view plot ⚠️ NO THRESHOLD	5.29 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	342.66 units
benchmarks/sequential/03_alloc_throughput/bench	📈 view plot ⚠️ NO THRESHOLD	5.20 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	11,508.36 units
benchmarks/sequential/13_soa_layout/bench	📈 view plot ⚠️ NO THRESHOLD	5.17 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	755.09 units

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github-actions · 2026-05-11T23:39:29Z

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Branch	register-machine
Testbed	ubuntu-latest

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Benchmark	leak-build-ms	Measure (units) x 1e3	leak-count	leak-run-ms	Measure (units)
benchmarks/concurrent/05_backpressure/bench	📈 view plot ⚠️ NO THRESHOLD	5.27 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,894.18 units
benchmarks/concurrent/10_shard_vs_locked/bench	📈 view plot ⚠️ NO THRESHOLD	5.24 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	60,004.63 units
benchmarks/concurrent/16_observables/bench	📈 view plot ⚠️ NO THRESHOLD	5.20 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	103.10 units
benchmarks/inter-clear/03_concurrent_mvcc_vs_rwlock/bench	📈 view plot ⚠️ NO THRESHOLD	5.95 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	298.39 units
benchmarks/sequential/07_pointer_chase/bench	📈 view plot ⚠️ NO THRESHOLD	5.25 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	521.40 units
benchmarks/sequential/12_weak_ref_graph/bench	📈 view plot ⚠️ NO THRESHOLD	5.18 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	269.25 units
benchmarks/server/03_pathological/server	📈 view plot ⚠️ NO THRESHOLD	5.29 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,002.88 units

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github-actions · 2026-05-11T23:39:48Z

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Testbed	ubuntu-latest

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Benchmark	leak-build-ms	Measure (units) x 1e3	leak-count	leak-run-ms	Measure (units)
benchmarks/concurrent/04_fanout_fanin/bench	📈 view plot ⚠️ NO THRESHOLD	5.63 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	3,253.07 units
benchmarks/concurrent/09_kvstore/bench	📈 view plot ⚠️ NO THRESHOLD	5.72 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	60,004.15 units
benchmarks/concurrent/14_nested_lock/bench	📈 view plot ⚠️ NO THRESHOLD	5.61 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	383.34 units
benchmarks/inter-clear/02_concurrent_fsm_vs_stackful/bench_fsm	📈 view plot ⚠️ NO THRESHOLD	5.53 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	152.22 units
benchmarks/inter-clear/02_concurrent_fsm_vs_stackful/bench_stackful	📈 view plot ⚠️ NO THRESHOLD	5.52 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	202.06 units
benchmarks/sequential/11_pipeline_overhead/bench	📈 view plot ⚠️ NO THRESHOLD	5.58 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	12,381.34 units
benchmarks/server/02_json_api/server	📈 view plot ⚠️ NO THRESHOLD	5.77 units x 1e3	📈 view plot ⚠️ NO THRESHOLD	📈 view plot ⚠️ NO THRESHOLD	1,002.83 units

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cuzzo force-pushed the register-machine branch 2 times, most recently from 340f8a5 to 4180c4b Compare May 11, 2026 00:35

cuzzo and others added 8 commits May 11, 2026 23:36

Support runtime collection handles in register VM

e652332

chore(minivm): summarize register benchmark blockers

1eacd7a

cuzzo force-pushed the register-machine branch from 4180c4b to 1eacd7a Compare May 11, 2026 23:37

cuzzo added 11 commits May 11, 2026 23:56

feat(minivm): support benchmark helper natives in register VM

d7f3bda

fix(minivm): emit string contains before map contains

562f889

fix(minivm): allow discarded helper call results

7cd1691

feat(minivm): support lowered pool slot iteration

4d6837c

feat(minivm): support borrowed list iterator lowering

79a01e4

feat(minivm): support float numeric maps in register VM

8651a2d

feat(minivm): support pool id list lookups in register VM

d515cb0

feat(minivm): lower soa lists in register VM

51ca851

feat(minivm): support weak rc graph lowering

448fa63

perf(minivm): lazily load struct-list fields

b6df76d

fix(minivm): update mutable struct bindings in register VM

f1c5236

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feat(minivm): register VM bytecode pipeline + debugger (Phase 0/1)#35

feat(minivm): register VM bytecode pipeline + debugger (Phase 0/1)#35
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cuzzo commented May 9, 2026

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