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writeonce/docs/stories/language-runtime-database/done/02-vm-core.md
shoney.arickathil 954aacc9a5 docs: story frontmatter + Dataview board views 
- 28 story files gain YAML frontmatter: iteration id, status
  (mirrors folder), chain position (7 files, positions 1-6)
- board-views.md: Dataview queries (not-done, by-status lanes,
  chain order, active); Kanban caveat — view only, frontmatter
  is source of truth, folder move + status key change together
- board points at the views

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-21 12:17:50 +02:00

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iteration status
2 done

Iteration 2 — VM core (wovm)

Format: fiberloom product/story-iteration-template. Part of Story — one language, one runtime, one database, one binary.

Goals

  • A C, libc-only virtual machine that loads a .wob bytecode module and executes method calls with the language's memory model enforced: owned objects with deterministic drops, runtime borrow checks at residual sites, and @gc classes collected without stop-the-world pauses.
  • Arithmetic and text operations execute correctly — the language's first observable behavior.

Acceptance Criteria

  • What to achieve?
    • Given a hand-assembled .wob fixture with arithmetic and method calls,
    • when wovm loads and runs it,
    • then output matches the fixture's expectation and a corrupted image is rejected by the loader before any instruction executes.
  • What to achieve?
    • Given a fixture that acquires conflicting exclusive borrows,
    • when it runs,
    • then the VM traps with the borrow-violation code, unwinds running every drop, and ASan/Valgrind report zero leaks on both success and trap paths.
  • What to achieve?
    • Given a cyclic @gc object graph that becomes garbage,
    • when the collector's budgeted ticks run,
    • then the cycle is freed within the configured budget and no pause exceeds the configured slice.

Out Of Scope

  • The OCaml compiler (iteration 3) — fixtures here are assembled by the test tool, not compiled.
  • Threads, shards, mailboxes (iteration 8); any DB or HTTP capability.

Info

  • The 16-byte object header reserves a shard id now so iteration 8 needs no relayout.
  • Format contract: docs/plan/oop-vm/00-wob-format.md twinned with runtime/src/wob.h; ~40-op register instruction set, computed-goto dispatch.

Proposed Solution

  • Execute the existing plan: docs/superpowers/plans/2026-08-01-wob-format-and-vm-core.md (16 TDD tasks: arena, object model, borrow word, RC + cycle collector, test assembler, validating loader, interpreter, drop-map unwinding, builtins, CLI + just gate).