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re: an ISL symbol operand is a (tag, index) pair — and two more names withdrawn

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Verified rather than adopted: a subagent proposed that every even operand
slot is a type tag. Measured, the strong form is false and a precise form is
true.

TRUE: a SYMBOL operand is two words, a tag holding the constant 1 followed
by the index. Slot 0 is the integer 1 in 19899/19899 calls whose slot 4 is a
unit; slot 8 is tag-shaped in 100% of calls for every built-in taking a
second unit; slot 16 is 1 in 152/152 for built-in 128, the only one taking a
third. The 24 built-ins whose slot 0 is NOT the constant are exactly those
taking no symbol there. This explains the unit slots 4/12/20 rather than
replacing them.

FALSE as stated: slot 8 is a bare double for built-ins 4, 20, 24, 26, 28,
29, 90, 106 and 127, and built-in 75 carries five bare indices at 0/4/8/12/16
with no tags at all. Each built-in has a fixed signature and is 100%
self-consistent; none of the 34 with >=20 sites mixes the two.

Symbol table 1 has three types -- 1 routes (1362), 6 messages (2247), 7
effects (81) -- and its operand slots are type-pure, measured the same way.
Resolving them makes listings say what the script means:
`request_script_message(MSG_VOICE_D_257, ...)`, a fourth independent
confirmation of that name. Slots 24@4, 46@12 and 114@4 resolve 100% but MIX
types 6 and 1, so they are left unresolved rather than guessed.

Two more names withdrawn, neither replaced:
* 88 `camera_at` -- ZERO call sites in all 28 stages; never testable.
* 90 `camera_at_route` -- 8 sites, all Stage 02 phase 3, first operand is
  symtab-1 type 7 `eff_n0071`, an EFFECT name, in 8/8, with a per-missile
  Route_ADT301..308_p3M at slot 20. Not aimed at a camera.

Left unnamed on purpose: replacing a guessed name with another guess is how
the three names corrected earlier today went wrong.

Also flagged: 115 `named_event`'s only symbol operand is an eff_* name in
84/84 sites, so that name is suspect too. Not renamed pending a handler read.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE
This commit is contained in:
Sylpheed RE agent
2026-08-25 22:51:07 +00:00
parent 608a0cc710
commit 75f0664bfe
4 changed files with 124 additions and 11 deletions
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5
docs/re/data/isl-stage02.txt
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@@ -110,7 +110,6 @@ Generated by `tools/re-capture/isl_report.py calls`.
115 named_event 9
48 squadron_escort 8
39 MARK_LAST_PHASE 8
90 camera_at_route 8
17 wait_frames 6
10 random 6
123 timer_resume 5
@@ -140,7 +139,7 @@ resync from 0x5058
0050CC: 02030C00 set.i len=12 k=02,03 00000010 00000000 local[16] = special[0]
0050D8: 01021001 set.f len=16 k=01,02 00000000 BFF00000 00000000 special[0] = imm -1
0050E8: 02030C01 set.f len=12 k=02,03 00000018 00000000 local[24] = special[0]
0050F4: 00000C13 call len=12 k=00,00 00000040 00000245 request_script_message(0x42, 0x2, 0x1, 0x9, 0x1, -1)
0050F4: 00000C13 call len=12 k=00,00 00000040 00000245 request_script_message(MSG_VOICE_D_257, 0x2, 0x1, 0x9, 0x1, -1)
005100: 0000080C jmp len=8 k=00,00 0000507C -> code+0x507C (file 0x50A0)
005108: 0000080C jmp len=8 k=00,00 0000507C -> code+0x507C (file 0x50A0)
005110: 01020C0A op10 len=12 k=01,02 00000000 00000000
@@ -167,7 +166,7 @@ resync from 0x5058
005208: 01030C00 set.i len=12 k=01,03 00000004 00000056 local[4] = imm 0x56
005214: 01021001 set.f len=16 k=01,02 00000000 00000000 00000000 special[0] = imm 0
005224: 02030C01 set.f len=12 k=02,03 00000008 00000000 local[8] = special[0]
005230: 00000C13 call len=12 k=00,00 00000014 00000252 hp_pct_test(0x1, TCN004, 0)
005230: 00000C13 call len=12 k=00,00 00000014 00000252 hp_pct_test(TCN004, 0)
00523C: 01020C0A op10 len=12 k=01,02 00000000 00000001
005248: 0000080E op14 len=8 k=00,00 0000575C
005250: 01020C00 set.i len=12 k=01,02 00000000 00000000 special[0] = imm 0x0