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Implement native RT.DAT read history

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gamer147
2026-07-24 15:11:30 -04:00
parent f17c89ec9a
commit bda586aa28
19 changed files with 646 additions and 28 deletions
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10
docs/sys4-format-notes.md
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@@ -64,7 +64,7 @@ consistent with the SYS4/SYS5 family.
```
body[0 .. F8) CODE bytecode instruction stream
body[F8 .. F10) TABLE-1 (F7 entries, 1 dword each) -> targets of type 0x71
body[F8 .. F10) TABLE-1 (F7 entries, 1 dword each) -> read-message boundaries (op 0x71)
body[F10 .. F12) TABLE-2 (F9 entries, 1 dword each) -> targets of type 0x03
body[F12 .. EOF) TABLE-3 (F11 entries, 1 dword each) -> targets of type 0x8F
```
@@ -80,11 +80,15 @@ tag identifying the pointed-to construct:
| Table | count/off | Target dword tag | Hits | Meaning (inferred) |
|---|---|---|---|---|
| T1 | F7 / F8 | **0x71** | 26,445/26,445 | labels / call targets (operand at +2 is small: mostly 1) |
| T1 | F7 / F8 | **0x71** | 26,445/26,445 | per-script read-message boundary index |
| T2 | F9 / F10 | **0x03** | 3,018/3,018 | data/variable entries (operand at +2 large, e.g. addresses) |
| T3 | F11 / F12| **0x8F** | 72,941/72,941 | instruction/line entries (largest table; operand at +2 huge) |
100% type purity — not a single target had a different tag. T3 is the big one
100% type purity — not a single target had a different tag. Native
`read_text_db_find_message_index@0x468f50` searches T1 for the code DWORD coordinate most recently
snapshotted by op `0x71`; its zero-based entry index and F7 count are the message index/count stored in
shared `RT.DAT`. Thus T1 is not a generic label table even though every entry is a control-structure
site. T3 is the big one
(~73k entries corpus-wide), consistent with it being a per-instruction or
per-source-line index (a debug/line table). T1 ≈ labels, T2 ≈ a smaller symbol set.