17d1d2c999
Three iterations circled this. Following the value rather than the
filename settles it in two hops:
1. SilphScriptPhase's ctor sub_8225FEF8 never touches r7 (zero
mentions). The BASE ctor sub_822700C0 keeps it:
or r26, r7, r7 -> stw r26, 152(r30)
2. sub_82261F70 indexes a stack table of string pointers with that
field. The table is contiguous at 0x820A8880, 20 bytes/entry:
index 0 = STAGE01_UNIT_MAX ... index 32 = STAGE33_UNIT_MAX,
then PLANE at 33.
So X+12 = [phase+152] = a 0-based stage index, N -> STAGE(N+1), and the
gate is explained rather than described: <= 32 is the array bound (33
entries) and != 16 is STAGE17, the one stage number with no .ssb.
This retracts my own "not adopted": the stage-index reading was 1-of-1
but coincidence-shaped two iterations ago; 0-based is now PROVED by
index 5 -> STAGE06.
Caught a false positive: 0x82272D88 lwz r11, 152(r11) in the built-in
switch is a virtual call to slot 38 -- r11 is the vptr, not the phase.
Also names a third class: sub_822700C0 stamps 0x820A8E44 =
SilphScriptPhaseBase, so the hierarchy is Base <- ScriptPhase and
Base <- Demo.
Docs only; artefacts byte-identical.