Robert Allan JamesandClaude Sonnet 5
4e7dcdf889
FENCE ( -- ) exposes the dict_fence_latest/dict_fence_here state FORGET already honored internally, letting callers (e.g. a future SDK capsule) raise the boundary after loading their own content -- no new VM fields, no policy logic beyond exposing existing state. Writing a direct test for it surfaced a real, severe, pre-existing bug in FORGET's relink logic, unrelated to FENCE itself and reproducible with the original boot-time fence alone: - Forgetting the single newest word incorrectly destroyed every other word back to the fence too, not just the target. - Forgetting an older word (correctly cascading to remove newer words too, per FORTH-79 semantics) crashed with SIGSEGV. Root cause: the relink code's target_prev pointer was, by construction, always inside the range the preceding loop had just freed whenever target wasn't vm->latest -- so writing through it was a use-after-free every time that branch executed. Fixed by removing the target_prev tracking and both branches entirely; vm->latest unconditionally becomes target_next (target's own captured, still-valid link) after the free loop, correct in every case. Added a FENCE test suite to dictionary_manipulation_words_test.c (Module 14) including the exact regression case (forgetting the newest word must not disturb an older one). Verified zero warnings and identical POST/dict_hash results across all three kernel architectures. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
capsules/
FORTH personality files loaded by the VM at boot. A capsule is an immutable, content-addressed payload; its XXHash64 hash is its identity. Any mutation changes the hash and the birth protocol rejects the image.
Key files
| File | Type | Purpose |
|---|---|---|
init.4th |
(m) MAMA_INIT |
Default Mama VM personality — loaded at LBN 2048 |
ACL.4th |
user | Word-level ACL system; self-activating at boot |
zuse.4th |
user | Bootstrap superuser; loaded by ACL.4th |
doe.4th |
user | DoE workload words (EXEC-DOE) — opt-in |
init-0.4th … init-9.4th |
(p) |
Numbered personality variants |
init-l8-*.4th |
(p) |
L8 Jacquard mode variants (stable/volatile/diverse/temporal/transition/omni) |
hermes/init.4th |
(p) |
Hermes baby VM personality |
artemis/init.4th |
(p) |
Artemis baby VM personality |
Block namespace
Block ranges are shared across all loaded capsules — collisions cause silent word-definition overwrites.
| Range | Owner |
|---|---|
| 2048–2099 | init.4th |
| 2100–2199 | doe.4th |
| 3000–3999 | workload capsules |
| 4000+ | user-defined (ACL.4th, zuse.4th, …) |
Each block is limited to 1024 bytes. Verify with wc -c before committing.
See also
experiments/bare_metal/README.md— DoE protocols and block namespace rulesdocs/03-architecture/word-acl/DESIGN.md— ACL system designtools/mkcapsule.c— assembles capsules intocapsule_generated.c- Project root