POST coverage cluster 3/4: inference-engine accessors (proof-covered, previously untested)
New module (inference_words_test.c, Module 26) covers exactly the 8 words proof/COVERAGE.md marks proof-covered in inference_words.c (out of 20 registered): the 5 output accessors (INFER-WINDOW@/DECAY@/ VARIANCE@/FIT@/EARLY-EXIT@), INFER-RUN (populates what they read), and Q.VARIANCE/INFER-DECAY-SLOPE/INFER-WINDOW-WIDTH (array-based primitives, using HERE as multi-cell scratch memory). Deliberately not the L8 Jacquard or Bayesian-posterior words in the same file -- not proof-covered, out of this cluster's scope. Caught and fixed a contract-selection mistake before booting: copied CONTRACT_PHYSICS_TRANSPARENT from the Q48.16 cluster without checking whether it fit. It doesn't -- these words are specifically about reading physics state (dictionary heat, rolling window), so asserting A4' transparency on them would test an invariant they deliberately don't have. Switched to CONTRACT_NONE with an explanatory comment. Boot-verified: zero warnings, all 9 suite entries pass, FINAL TEST SUMMARY 1031->1040 total / 993->1002 passed (+9 exactly), 0 failed, contract checks (A4'/A1) still report "all passed" -- confirms the CONTRACT_NONE fix actually avoided the violation, not just silenced it. Cluster 4 of 4 (final one) left: physics freeze/diagnostic, 5 words. Full writeup in FABRIC-2.md Section J. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
co-authored by
Claude Sonnet 5
Claude Sonnet 5
parent
7100523656
commit
825ab078f1
+36
@@ -1506,3 +1506,39 @@ only in each word's own line and the global `FINAL TEST SUMMARY`. Confirmed pre-
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checking `Arithmetic Words Summary` in the same boot log, not introduced here.
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Two clusters left: inference-engine accessors (8 words), physics freeze/diagnostic (5 words).
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**Cluster 3, inference-engine accessors — done.** `inference_words.c` registers 20 words;
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`proof/COVERAGE.md` claims coverage for only 8 ("5 accessors full; rest guard/shape") —
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`INFER-WINDOW@`/`INFER-DECAY@`/`INFER-VARIANCE@`/`INFER-FIT@`/`INFER-EARLY-EXIT@` (the five
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output accessors), `INFER-RUN` (the word that populates what they read), and the two other
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array-based primitives `Q.VARIANCE`/`INFER-DECAY-SLOPE` plus `INFER-WINDOW-WIDTH`. New file
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`inference_words_test.c` (Module 26, matching `word_registry.c`'s own numbering again) covers
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exactly those 8 — deliberately **not** the L8 Jacquard or Bayesian-posterior words in the
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same file, since `COVERAGE.md` doesn't claim proof coverage for them and this cluster's scope
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was proof-covered-but-untested, not "everything in this file."
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**A real contract-selection mistake caught before booting, not after.** Copied
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`{CONTRACT_PHYSICS_TRANSPARENT, 0}` from the Q48.16 cluster without re-deriving whether it
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fit — it doesn't. That contract re-runs a word's input under perturbed physics scalars
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(execution heat, rolling-window fields, etc.) and requires an identical result, enforcing
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axiom A4' (word results independent of physics state). `INFER-RUN` and the accessors reading
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its output are specifically *about* physics state (dictionary heat, the rolling window) —
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applying A4' transparency to them would assert an invariant they deliberately don't have, by
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design, not a bug to catch. Caught by re-reading the contract's own implementation
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(`test_contracts.c`) before running anything, not by a failing boot — switched to
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`{CONTRACT_NONE, 0}` with an inline comment explaining why, matching how the hand-rolled ACL/
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Mama modules (which also touch state contracts shouldn't police) opt out of the tabular
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runner's contract mechanism entirely.
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The three array-based words needed real data in VM memory — `HERE`, `HERE 8 +`, `HERE 16 +`
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used as three-cell scratch storage, the same idiom `memory_words_test.c` already uses for
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single-cell tests, just extended to multiple cells at literal byte offsets (cell size is 8
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bytes here, no `CELL+` needed).
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Verified: zero build warnings, all 9 test-suite entries pass, `FINAL TEST SUMMARY` moved
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1031→1040 total / 993→1002 passed (+9 exactly), 0 failed, **contract checks (A4'/A1) still
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report "all passed"** — confirming the `CONTRACT_NONE` fix actually avoided the violation it
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was meant to avoid, not just silenced a check.
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One cluster left: physics freeze/diagnostic (5 words: `FREEZE-WORD`, `FREEZE-CRITICAL`,
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`UNFREEZE-WORD`, `FROZEN?`, `DECAY-RATE@`).
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@@ -1,5 +1,5 @@
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# Capsule Block Manifest — Auto-generated
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<!-- Generated by mkcapsule --manifest 2026-08-19T03:28:49Z -->
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<!-- Generated by mkcapsule --manifest 2026-08-19T03:33:37Z -->
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<!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh. -->
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<!-- Hand-written justifications and immutability notes live -->
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<!-- in MANIFEST.md alongside this auto-generated index. -->
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File diff suppressed because it is too large
Load Diff
@@ -109,6 +109,12 @@ void run_acl_words_tests(VM * vm);
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*/
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void run_q48_words_tests(VM * vm);
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/*
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* @brief Run tests for the proof-covered subset of inference-engine words (Module 26)
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* @param vm Pointer to the VM instance
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*/
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void run_inference_words_tests(VM * vm);
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/*
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* @brief Run tests for Mama FORTH vocabulary (capsule system M7.1)
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* @param vm Pointer to the VM instance
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@@ -0,0 +1,139 @@
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/*
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StarForth — Steady-State Virtual Machine Runtime
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Copyright (c) 2023–2025 Robert A. James
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All rights reserved.
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This file is part of the StarForth project.
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Licensed under the StarForth License, Version 1.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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https://github.com/star.4th@proton.me/StarForth/LICENSE.txt
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This software is provided "AS IS", WITHOUT WARRANTY OF ANY KIND,
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express or implied, including but not limited to the warranties of
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merchantability, fitness for a particular purpose, and noninfringement.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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* inference_words_test.c — POST tests for the SSM inference engine's
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* proof-covered accessor/primitive words (Module 26)
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*
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* inference_words.c registers 20 words; only 8 are proof-covered per
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* proof/COVERAGE.md ("5 accessors full; rest guard/shape") — this file
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* covers exactly those 8, not the L8 Jacquard / Bayesian-posterior words,
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* which COVERAGE.md does not claim coverage for. No test file existed for
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* any word in this module before.
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*
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* The three array-based primitives (Q.VARIANCE/INFER-DECAY-SLOPE/
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* INFER-WINDOW-WIDTH) need real data in VM memory — HERE is used as
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* scratch, matching the idiom memory_words_test.c already uses. The four
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* *-@ accessors and INFER-RUN are exercised in one suite (INFER-WINDOW@)
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* that runs INFER-RUN first, since the accessors just read
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* vm->last_inference_outputs and INFER-RUN is what populates it.
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*/
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#include "../include/test_runner.h"
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#include "../include/test_common.h"
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/* Inference Engine Words Test Suites - Module 26 */
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static WordTestSuite inference_word_suites[] = {
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{
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"Q.VARIANCE", {
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{"three_cells", "100 HERE ! 200 HERE 8 + ! 300 HERE 16 + ! HERE 3 Q.VARIANCE Q.TO-INT . CR",
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"Should print population variance of {100,200,300} (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-DECAY-SLOPE", {
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{"three_cells", "300 HERE ! 200 HERE 8 + ! 100 HERE 16 + ! HERE 3 INFER-DECAY-SLOPE Q.TO-INT . CR",
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"Should print decay slope for a decreasing trajectory (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-WINDOW-WIDTH", {
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{"three_cells", "100 HERE ! 200 HERE 8 + ! 300 HERE 16 + ! HERE 3 INFER-WINDOW-WIDTH . CR",
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"Should print an inferred window width (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-RUN", {
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{"basic", "INFER-RUN", "Should run without error", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-WINDOW@", {
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{"after_run", "INFER-RUN INFER-WINDOW@ . CR", "Should print last adaptive_window_width (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-DECAY@", {
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{"after_run", "INFER-RUN INFER-DECAY@ Q.TO-INT . CR", "Should print last adaptive_decay_slope (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-VARIANCE@", {
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{"after_run", "INFER-RUN INFER-VARIANCE@ Q.TO-INT . CR", "Should print last window_variance_q48 (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-FIT@", {
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{"after_run", "INFER-RUN INFER-FIT@ Q.TO-INT . CR", "Should print last slope_fit_quality_q48 (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{
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"INFER-EARLY-EXIT@", {
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{"after_run", "INFER-RUN INFER-EARLY-EXIT@ . CR", "Should print 0 or 1 (no error)", TEST_NORMAL, 0, 1, {0}},
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{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}
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},
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1, {0}
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},
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{NULL, {{NULL, NULL, NULL, TEST_NORMAL, 0, 0, {0}}}, 0, {0}}
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};
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/**
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* @brief Executes the proof-covered subset of inference-engine word test suites
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* @param vm Pointer to the Forth virtual machine instance
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* @details Covers the 8 words proof/COVERAGE.md marks as proof-covered in
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* inference_words.c: the three array-based primitives (Q.VARIANCE,
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* INFER-DECAY-SLOPE, INFER-WINDOW-WIDTH), INFER-RUN, and the four
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* *-@ output accessors (INFER-WINDOW@/DECAY@/VARIANCE@/FIT@) plus
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* INFER-EARLY-EXIT@. Does not cover the L8 Jacquard or Bayesian
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* posterior words in the same file — not claimed as proof-covered.
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*/
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void run_inference_words_tests(VM *vm) {
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log_message(LOG_INFO, "Running Inference Engine Words Tests (Module 26)...");
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/* CONTRACT_NONE, not CONTRACT_PHYSICS_TRANSPARENT: these words read
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* physics state (rolling window, dictionary heat) by design -- A4'
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* transparency is a property they deliberately do not have. */
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WordContract mod = {CONTRACT_NONE, 0};
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for (int i = 0; inference_word_suites[i].word_name != NULL; i++) {
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log_message(LOG_TEST, "▶ Testing module: %s", __FILE__);
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run_test_suite_m(vm, &inference_word_suites[i], mod);
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}
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print_module_summary("Inference Engine Words", 0, 0, 0, 0);
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}
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@@ -131,6 +131,7 @@ static TestModule test_modules[] = {
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{"ACL Words", NULL, 0, run_acl_words_tests}, /* Module 23: Word-Level ACL System */
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{"Mama FORTH Words", NULL, 0, run_mama_forth_words_tests}, /* Module 24: Capsule System M7.1 */
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{"Q48.16 Words", NULL, 0, run_q48_words_tests}, /* Module 25: Q48.16 Fixed-Point Arithmetic */
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{"Inference Engine Words", NULL, 0, run_inference_words_tests}, /* Module 26: SSM Inference (proof-covered subset) */
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{NULL, NULL, 0, NULL} /* End marker */
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};
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