Files
BFM-decomp/config
Drew T 1ab9905368 feat(phase-26): §8d scope_data_externs — the ×133 sweep blocker fixed; func_8015AE2C banked ×134
- ROOT CAUSE (R14 — the session-7 diagnosis was half right): the isolated region builds [ OK ]
  WITHOUT the body, so §8b isolation was never implicated. `family_remap.gather_externs` prepends
  carried decls at FILE scope; D_801812A4 is a fn-ptr dispatch table the sibling declares FOUR
  incompatible ways at BLOCK scope inside its own later functions, so the carried file-scope decl
  ESTABLISHES A GLOBAL THE TU NEVER HAD and every later block-scope extern must now agree with it.
  Byte-proven asymmetry: BLOCK(int)->BLOCK(struct*)->FILE(void*) builds; FILE(void*)->BLOCK(int)
  errors. It was the ONLY hard error in the build — all 27 carried function externs were fine raw.

- THE FIX (demote, don't reconcile): tools/scope_data_externs.py emits a carried D_ extern at BLOCK
  scope inside the function body when the TU has no file-scope decl of it above the insertion point.
  Byte-neutral (an extern emits no code; type + access opcodes unchanged) and never worse than raw,
  so it needs no oracle, no type comparator, no fn-ptr parser. Restores fidelity — the original
  declares these symbols at block scope in exactly this way. Wired into jtbl_family_bank as the
  `scoped` stage: raw -> scoped -> recovered -> reconciled (scoped is the base for the later stages).

- reconcile_decls is the WRONG instrument for this class, twice: its oracle answers "what does the
  FLEET call this symbol" when the question is "what can THIS TU see", and its DATA_DECL_LINE_RE
  cannot parse `extern void (*D_x[])(void *);` — silently skipping the very symbols that were
  failing (the phase's third silent-skip bug, after find_site braces + overlay_files splits).

- R17 TRIAGE RULE, first real test, held: `conflicting types` = the compiler REFUSED TO COMPILE =
  a C front-end diagnostic = our Python. Reading cse.c/global.c would have taught nothing.

- RESULT: func_8015AE2C (562 ins, reach 134) swept 133/133 siblings, 0 failures. R22 clean-fleet
  136/136 BYTE-IDENTICAL (534 changed src files); dedup-check 1813 validated / 0 failed; 0
  NON_MATCHING (G4). instr-weighted 63.0 -> 63.6%; distinct-code 39.1 -> 40.5% (+256 unique fns /
  +79,957 ins) — one core, ~0 agent tokens.

- knowledge captured during the producing session (R30/R31/R21): cookbook §8d, decision-log
  2026-07-13 session 8, SETUP tool-inventory row; CURRENT_PHASE session-8 checkpoint.
2026-07-13 20:45:15 -06:00
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