feat(codegen): UNSHADOW C-class — proof-carrying bounds elision (3.25×)#2143
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…lision `for i in 0..len(arr)` 의 per-iteration bounds-check 를 정적 증명으로 삭제하는 🔵 proof-carrying codegen 변환. §lto-unwall 이 NULL 로 분리해낸 axis(runtime.o 벽 제거 단독으론 불충분, CODEGEN 증명 필요)를 win 으로 전환. 정적 증명(self/codegen.hexa, _inrange_facts 스택 + helpers): - ForStmt range fast-path 에서 (배타 range · lower=리터럴0 · upper=`len(arr)`/ `arr.len()` bare Ident · body 가 arr resize/reassign·`i` reassign 안 함) 이면 `0<=i<arr.len` exact·local 보장 → in-range fact push, loop exit 에 pop. - Index emit: read `arr[i]` 를 `HX_IS_ARRAY(arr) ? arr.arr_ptr->items[i] : hexa_index_get(...)` 로 emit — bounds+throw 삭제, array-tag guard 1개만 잔존 (untyped HexaVal codegen, OOB-안전). HexaArr+arr_ptr=runtime.h public → 벽 관통. 측정(mini macOS arm64, faithful A/B proxy, best-of-9): 256-elem int hot loop 1.88→0.56s = 3.25× (−69%). g5 byte-diff IDENTICAL (in-range·OOB 양쪽 fda59d53). 무결성 게이트 PASS: `arr[len]` OOB 는 양쪽 arm 여전히 throw(증명-안전 read 만 삭제). full self-host regen 은 B9 generated-runtime 벽으로 차단(prior agents 동일) → A/B proxy(emit 문자열 codegen 과 byte-동일·스펙 허용). repo 안 .c 0개. verdict=.verdicts/unshadow-cclass-bounds/ · 재현=tool/unshadow_cclass_bounds_bench.hexa Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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🔵 C-class proof-carrying bounds/null elision (unwall NULL이 분리한 codegen axis).
for i in 0..len(arr)정적 in-range 증명(exclusive·lower=0·upper=arr.len bare-ident·body no-resize/no-realias) → bounds-check+hexa_throw 삭제, publicarr_ptr필드로 runtime.o 벽 관통. mini 256-elem 핫루프 1.88→0.56s (3.25×, −69%). g5 byte-identical(md5 fda59d53) + OOB-still-throws 무결성 통과(증명된 read만 elide). 잔여 레버=array-tag 가드(known-array 타입추적시 제거). .c 손작성 0. 🤖 Generated with Claude Code