Session-4 same-subseg handling (the de-risk preamble's harder half; byte-proof of
the merged build + isolation deferred to Stage 2 with concrete cores):
- jtbl_carve.py: MERGE adjacent same-subseg carves into one spanning .rodata piece
(a code object emits its jtbls contiguous, so two matched jr-fns in one subseg are
byte-correct iff their jtbls abut). BOUND-FIX: a new jtbl's end is bounded by the
next raw dlabel OR the next existing carve start (an already-carved adjacent jtbl
is gone from the data asm -> raw dlabels over-extend it -> false "non-contiguous").
Config-proven (func_80171B4C 801D8C48 merges with func_801734BC 801D8C68). NO-OP
for family-1/cross-subseg (single carve per subseg) -> committed configs unaffected.
- jr_isolate.py (scaffold, NOT yet functional): the non-contiguous case — split a fn
into its own code subseg (whale _o0b precedent) so its jtbl carves independently.
BLOCKED on split_src_region, which can't partition the overlay .c (global canonical-
sig extern layer + per-fn callee-externs + DEFINE_func macros + @class annotations,
~922 non-address items). Stage-2 build item (overlay-.c-aware source split).
- cookbook §8b (the --order sandwich + the two same-subseg cases + the blocker);
CURRENT_PHASE session-4 checkpoint updated with the Stage-2 unblock decision.
Drew T