docs: update Phase 257-259 SSOT (first FAIL is is_integer)
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## Next (planned)
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- Phase 259: `StringUtils.is_integer/1`(nested-if + loop)を JoinIR で受理して `--profile quick` を進める
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- Phase 141 P2+: Call/MethodCall 対応(effects + typing を分離して段階投入、ANF を前提に順序固定)
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- Phase 143-loopvocab P3+: 条件スコープ拡張(impure conditions 対応)
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- 詳細: `docs/development/current/main/30-Backlog.md`
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## 2025-12-20:Phase 257 P1.1/P1.2/P1.3 完了 ✅
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## Current First FAIL (SSOT)
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- **P1.1**: Pattern6 SSOT fix(false positive 根治)
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- `can_lower()` が `extract_scan_with_init_parts()` を呼び出して SSOT を確立
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- `index_of_string/2` の誤検出が解消(`Ok(None)` で graceful fall-through)
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- **P1.2**: LoopHeaderPhi CFG correction(entry predecessor 自動計算)
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- Step 0: `update_successors_from_terminator()` を手動実行(instruction_rewriter が set_terminator() をバイパスするため)
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- CFG から entry predecessors を計算(header_preds - latch_block)
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- 複数 entry preds 対応(bb0 host + bb10 JoinIR main)
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- host_entry_block を明示的に追加(emit_jump が finalize() 後に実行されるため)
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- **P1.3**: Smoke script validation(既存実装確認)
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- `phase254_p0_index_of_vm.sh`:`--verify` + VM error detection で false positive 回避
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- `json_lint_vm / StringUtils.is_integer/1`(Phase 259)
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**検証結果**:
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- ✅ `phase254_p0_index_of_min.hako` verify → PASS
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- ✅ `phase257_p0_last_index_of_min.hako` verify → PASS
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- ✅ `./tools/smokes/v2/run.sh --profile quick` → Pattern6 false positive なし(別の未サポートパターンで止まる)
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## 2025-12-20:Phase 258(index_of_string/2 dynamic window scan)✅
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**技術的発見**:
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- JoinIR merge では host entry block (bb0) の Jump が Phase 6 で設定されるため、Phase 4.5 の finalize() 時点で CFG に現れない
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- 解決策:`builder.current_block` を捕捉し、CFG 計算後に明示的に entry_preds へ追加
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- Phase 258 README: `docs/development/current/main/phases/phase-258/README.md`
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- Result: `index_of_string/2` を JoinIR で受理し、quick の first FAIL を `is_integer/1` へ進めた
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## 2025-12-20:Phase 257(Pattern6 reverse scan + PHI/CFG stabilization)✅
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- Phase 257 README: `docs/development/current/main/phases/phase-257/README.md`
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- Result: `last_index_of/2` を Pattern6(reverse scan)で受理し、PHI predecessor mismatch を fail-fast + 自動補正で根治
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## 2025-12-19:Phase 146/147 完了 ✅
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@ -93,11 +86,16 @@
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- Goal: `StringUtils.last_index_of/2` を JoinIR で受理し、`--profile quick` を緑に戻す
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- Investigation(最小再現/論点): `docs/development/current/main/investigations/phase-257-last-index-of-loop-shape.md`
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- Status: Pattern6 reverse scan + PHI/CFG 安定化は完了(最初の FAIL は次へ移動)
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- Current first FAIL: `json_lint_vm / StringUtils.is_integer/1`(nested-if + loop pattern, unsupported)
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- Current first FAIL: `json_lint_vm / StringUtils.index_of_string/2`(dynamic window scan, unsupported)
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## 2025-12-20:Phase 258(is_integer nested-if + loop)🔜
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- Phase 258 README: `docs/development/current/main/phases/phase-258/README.md`
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- Status: `index_of_string/2` を対象(dynamic window scan)
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## 2025-12-20:Phase 259(is_integer nested-if + loop)🔜
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- Phase 259 README: `docs/development/current/main/phases/phase-259/README.md`
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## 2025-12-19:Phase 254(index_of loop pattern)✅ 完了(Blocked by Phase 255)
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