md_MAIN_011:func_800CF28C · md_MAIN_003:func_800D0268/func_800D0740/func_800D0C50, all byte-verified
from a clean rebuild and counted from the SOURCE: md_MAIN_011 is now FULLY MATCHED (0 open stubs),
md_MAIN_003 is down to 1 (func_800CF3E8).
THE PREMISE I HANDED THE AGENT WAS WRONG, AND IT SAID SO. md_MAIN_011 is already a whole-object -O0
module — no carve was needed. Its real blocker was tools/jtbl_rodata_pads._s_rodata_span ignoring a
trailing `.align`, the SAME defect this session fixed for md_SC07_003 from the other direction: two
agents converged on it independently. Adopted this agent's stricter form (only a TRULY trailing
align rounds `hi`; an interior one is followed by data that sets `hi` higher anyway).
Note WHY it stayed latent: `derive`'s zero_gap self-corrects a 1-3 byte undershoot whenever the next
stream item is an anchor. A C jump table has NO anchor — so the bug can only fire the moment someone
banks a switch function into such an object, and when it fires it accuses the CARVE ("island layout
drift"), not itself.
md_MAIN_003 needed one new -O0 object, and the boundary I proposed (0x1f74 -> 0x1e58) was both too
narrow and off by 0x2B8. The carve made is `md_MAIN_003_o0e` at 0x1308 (vram 0x800D0100) running to
the existing o0c boundary: everything in that span is a §265 verbatim __asm__ body or an INCLUDE_ASM
stub — zero optimizable C — so the whole tail flips with one cut. Proved byte-identical with NOTHING
banked first (§431 discipline), then the three drafts gated one at a time.
TWO MORE GENERAL DEFECTS FIXED IN jr_isolate_all, both of which silently mis-place a boundary:
* an item-less CLOSING region emitted a duplicate `- [off, c, …]` line and the validator refused;
the empty-region skip covered only region 0, and `_partition`'s empty `footer` made the closing
region look non-empty.
* A §265 VERBATIM __asm__ BODY IS PREAMBLE, AND PREAMBLE IS ASSUMED BYTE-NEUTRAL. It is not — it
emits bytes. `parse_overlay_c` has four addressed-anchor forms and a verbatim body is none of
them, so it attaches to the NEXT anchor: cutting at func_800D0268 would have moved 0x168 bytes of
other functions into the new object while the yaml claimed the region starts higher. New
`_region_emit_start()` derives the yaml offset from the region's CONTENT (item addresses + every
.globl/.ent the text names that resolves inside the object) and takes min(cut, emit), so a
boundary can only move DOWN. Where no verbatim asm is in play it equals the cut — every existing
isolate is unchanged.
BLAST RADIUS PROVEN, not argued: jtbl_rodata_pads is in the build path (`--derive` for md_*/main),
so the agent rebuilt main + all 70 md_* from scratch (71/71) and then ran the full fleet:
**make check-all 213/213 passed, 0 failed**, main 143dbb89 BYTE-IDENTICAL.
CENSUS, denominator asserted (1057 live stubs, 0 without a .s): exactly ONE -O0-prologue stub
remains stranded in an -O2 TU fleet-wide — main:func_8002C410 in src/800_b.c, 299 ins. Nothing more
should be built for this class; the general tool already existed and what was missing was
correctness, not coverage.
Drew T
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