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re: the AA_/AV_ selection is BLOCKED for static RE, with the mechanism

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Route 3 (call-graph bound): sub_821A6CF0 and sub_821AB650 each read 196/200/204
off THREE different base registers -- three unrelated objects, not the block.

Route 4 (data-flow bound): the definition object lives in the global at
0x828F358C; 18 functions touch it, 9 also touch block offsets.  The two best
are refuted -- sub_8230D1F8 is the rank/score loader storing
CraftScore_Adjustment, FFPenalty_Zessel_Maximum and RankScore_S/A/B at exactly
256/320/324/328/332, and sub_82398CC0 uses r19 as a float-constant pool.

So the offset region is shared by two unrelated objects and a constant pool:
offset-based discrimination is contaminated by construction, which is why it
has now failed three times.  Catching the selection needs a runtime watch.

Side finding, unowned by the corpus: sub_8230D1F8 is the rank/score loader.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE
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Claude (auto)
2026-08-27 18:07:42 +00:00
parent 4ffbd39a01
commit 1a1a8d98d9
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48
docs/re/BACKLOG.md
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@@ -4476,3 +4476,51 @@ that is the next handle. **"Anti-air vs anti-vessel" stays a reading**, exactly
name→offset mapping when a scripted `addi`→`stfs` pairing (which I then wrote
anyway) gave the same 20 lines. Script the extraction first; never eyeball a
4.5 KB function.
---
## 🔴 2026-08-27 — the `AA_`/`AV_` selection is BLOCKED for static RE
Continues the entry above. Two more routes tried, both refuted with their cause
shown; per the standing rule, when every route has a control and they all read
zero, the item is blocked — writing it down and moving on.
**Route 3 — call-graph bound.** The only two functions reachable from the
loader's owner, `sub_821A6CF0` and `sub_821AB650`, each read `196`/`200`/`204`
in three consecutive instructions off **three different base registers**
(`r25`/`r24`/`r11` and `r30`/`r29`/`r11`). That is three unrelated objects
contributing one float each — not the AA/AV block. Refuted.
**Route 4 — data-flow bound.** The definition object lives in a global: the
loader is fed by `lwz r3, 13708(r26)` with `r26 = 0x828F0000`, i.e.
`[0x828F358C]`. **18** functions touch that global and **9** of them also touch
block offsets — a far better bound than the 39 from offset shape alone. The two
best candidates are both refuted:
* `sub_8230D1F8` is a **different loader**. Resolving its field names the same
`addi`→`stfs` way gives `+256 CraftScore_Adjustment`,
`+320 FFPenalty_Zessel_Maximum`, `+324 RankScore_S`, `+328 RankScore_A`,
`+332 RankScore_B` — it *stores* at exactly the offsets the unit definition
uses for `AA_Roll_Min` and the four `AxisMode` fields.
* `sub_82398CC0` uses `r19` as a **float-constant pool** (`320(r19)` next to
`272(r19)` and `-656(r19)`), not as a definition pointer.
🔑 **This explains the whole pattern of failure.** The offset region is shared by
at least two unrelated objects *and* by a constant-pool base, so every
offset-based discriminator is contaminated **by construction** — that is the
third time the offset route has failed on this corpus, and now with a mechanism
rather than just a count.
🔴 **BLOCKED.** Catching the selection needs a runtime watch on the definition
object's `+196`…`+332` during flight — emulator work, NEEDS-HUMAN, not a disc or
image read. The layout finding stands; "anti-air vs anti-vessel" stays a reading.
❔ **Side finding, unowned:** `sub_8230D1F8` is the **rank/score table loader** —
`RankScore_S`/`_A`/`_B`, `FFPenalty_Zessel_Maximum`, `CraftScore_Adjustment`.
Grep confirms nothing in `docs/re/` mentions any of those names. A cheap item for
a future iteration.
**Method slip, second time in two iterations:** I dumped ~400 instructions of
`sub_82398CC0` by eye before writing the six-line name-resolution script that
settled both candidates. **Write the script first** — it is in the standing rules
and I broke it again.

2
docs/re/INDEX.md
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@@ -107,7 +107,7 @@ files, which is how the same ground got covered twice.
| [`structures/hangar-loadout-system.md`](structures/hangar-loadout-system.md) | The Hangar loadout system — loadout → per-slot allow-list → arsenal item | ✅ CONFIRMED — 60/60 slot refs, 70/88 item refs (18 = the `No_Equipment` sentinel) |
| [`structures/arsenal-item-weapon-chain.md`](structures/arsenal-item-weapon-chain.md) | The 59-of-131 arsenal question — an item names a hardpoint slot, not a weapon | ✅✅ CONFIRMED — 0/59 `PlayerWeapon` are a `Weapon.ID`, 59/59 are a `Turret_NNN` slot |
| [`structures/unit-substructure-records.md`](structures/unit-substructure-records.md) | The destructible-subsystem model — a unit's `Turret`/`Bridge`/`Hatch`/`ShieldGenerator`/`Thruster` sub-records | ✅ CONFIRMED — 835 turrets, 835/835 `WeaponID` resolve, `StructureCount` control 667/684 |
| [`structures/unit-datasheet-static.md`](structures/unit-datasheet-static.md) | The static unit datasheet and AI flight model — `Generic`, `Maneuver`, `Effect` | ✅ CONFIRMED — 394 Generic + 114 Maneuver + 114 Effect records read; AA_/AV_ are one interleaved block (AV at X, AA at X+8), selection still unfound |
| [`structures/unit-datasheet-static.md`](structures/unit-datasheet-static.md) | The static unit datasheet and AI flight model — `Generic`, `Maneuver`, `Effect` | ✅ CONFIRMED — 394 Generic + 114 Maneuver + 114 Effect records read; AA_/AV_ are one interleaved block (AV at X, AA at X+8), selection 🔴 BLOCKED for static RE (4 routes, all controlled) |
| [`structures/weapon-datasheet-static.md`](structures/weapon-datasheet-static.md) | The static weapon datasheet — `Weapon`, `Shell`, `AssortMissileParam` | ✅ CONFIRMED — 131 Weapon + 131 Shell + 9 AssortMissileParam records read |
| [`structures/isl-timers.md`](structures/isl-timers.md) | A ScriptPhase owns 32 stopwatches, and they count seconds | ✅ CONFIRMED — the advance is read from `sub_822710D0`, the unit from |
| [`structures/isl-message-dialogue-link.md`](structures/isl-message-dialogue-link.md) | Mission scripts as dialogue — built-in 64 -> message id -> caption text | ✅ CONFIRMED total, 2 683/2 683 call sites across all 28 stages resolve, no residue |

40
docs/re/structures/unit-datasheet-static.md
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@@ -143,15 +143,39 @@ description, not a rule.
`0x8209F674…`. The loader uses the second block; **the first 20 are referenced by
nothing**.
### 🔴 The selection is still not found
### 🔴 The selection is BLOCKED for static RE — four routes, all with controls
Looking for the consumer by offset does not work here: functions loading two or
more of `+196`/`+204`/`+320`/`+328` number **39** across the image, and those
offsets are far too common to identify anything — the same trap the corpus has
paid for before. Only two of the 39 are call-graph-reachable from the loader's
owner (`sub_821A6CF0` itself, and `sub_821AB650`); that is the next handle, and
it was not followed this iteration. **So "anti-air vs anti-vessel" remains a
reading.**
| route | result |
|---|---|
| 1. string xref on the field names | ✅ **only** `sub_822F9498` references them — this gave the layout above, and nothing else in the image touches an `AA_`/`AV_` string |
| 2. unbounded offset intersection (`+196`/`+204`/`+320`/`+328`) | 🔴 **39** functions image-wide; pure coincidence |
| 3. call-graph bound — the loader's owner `sub_821A6CF0`, and `sub_821AB650` | 🔴 both read `196`/`200`/`204` off **three different base registers** in three consecutive instructions: three unrelated objects contributing one float each, not the block |
| 4. data-flow bound — the definition object lives in the global at `[0x828F358C]` (`lwz r3, 13708(r26)` feeds the loader); 18 functions touch it, 9 also touch block offsets | 🔴 the two best are both refuted, below |
**Why route 4's best candidates fail, and it is instructive:**
* `sub_8230D1F8` is a **different loader entirely** — a scoring table. Resolving
its field names the same way gives `+256 CraftScore_Adjustment`,
`+320 FFPenalty_Zessel_Maximum`, `+324 RankScore_S`, `+328 RankScore_A`,
`+332 RankScore_B`. It *stores* at the very offsets the definition object uses
for `AA_Roll_Min` and the four `AxisMode` fields.
* `sub_82398CC0` uses `r19` as a **float-constant pool** (`lfs f0, 320(r19)`
alongside `272(r19)` and `-656(r19)`), not as a definition pointer.
So the offset region is shared by at least two unrelated objects **and** by a
constant pool. That is *why* every offset-based discriminator has failed here:
the contamination is structural, not bad luck.
🔴 **Marking this blocked for static RE.** The selection would have to be caught
at runtime — a watch on the definition object's `+196`…`+332` during flight —
which is emulator work, not a disc or image read. **"Anti-air vs anti-vessel"
stays a reading**, as `unit-datasheet-static.md` has always had it; what is new
is the layout, and that the selector must be a `+0`/`+8` offset.
*Side finding, unowned by the corpus:* `sub_8230D1F8` is the **rank/score
table loader** — `RankScore_S`/`_A`/`_B`, `FFPenalty_Zessel_Maximum`,
`CraftScore_Adjustment`. Nothing in `docs/re/` mentions those names. Not pursued
here.
## `Effect`