feat(joinir): Phase 172 - Trim pattern JoinIR lowering implementation
Implement actual MIR generation for Trim pattern loops, enabling LoopBodyLocal variables to work through bool carrier promotion. ## Implementation (pattern2_with_break.rs) - emit_whitespace_check(): Generate OR chain for whitespace comparison - extract_substring_args(): Extract s, start from substring call - Initial carrier generation: ch0 = s.substring(start, start+1) - Whitespace check: is_ch_match0 = (ch0 == " " || "\t" || "\n" || "\r") - ConditionEnv integration: Register carrier for JoinIR condition - Break condition replacement: !is_ch_match instead of original ch checks ## Architecture - Host MIR: substring calls, OR chain evaluation, BoxCall - JoinIR: Only sees bool carrier for break control - No new JoinIR instructions added ## Documentation - phase172-trim-lowering-impl.md: Design and implementation details - loop_pattern_space.md: Analysis of all loop pattern combinations Test: Trim loops compile and generate JoinIR successfully Build: 0 errors, clean compilation 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
nyash-codex
@ -247,3 +247,7 @@ JoinIR は Rust 側だけでなく、将来的に .hako selfhost コンパイラ
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- 185–188: Strict mode / LoopBuilder 削除 / Pattern1–4 基盤
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- 189–193: Multi-function merge / Select bridge / ExitLine 箱化
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- 171–172 / 33‑10/13: ConditionEnv, ConditionBinding, JoinFragmentMeta, ExitLineRefactor 等
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- `docs/development/current/main/loop_pattern_space.md`
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- JoinIR ループパターン空間の整理メモ。
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どの軸（継続条件 / break / continue / PHI / 条件変数スコープ / 更新パターン）でパターンを分けるか、
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そして P1–P4 / Trim(P5) の位置づけと、今後追加候補のパターン一覧がまとまっている。
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170
docs/development/current/main/loop_pattern_space.md
Normal file
170
docs/development/current/main/loop_pattern_space.md
Normal file
@ -0,0 +1,170 @@
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# JoinIR Loop Pattern Space (Phase 171 Ultra‑Think Memo)
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このメモは「JoinIR のループパターン空間」を構造的に整理したものだよ。
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総当たりではなく、**直交する少数の軸**を組み合わせることで有限のパターンに収束することを確認する。
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---
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## 1. ループを構成する直交軸
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ループはだいたい次の 6 軸の組み合わせで記述できる：
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| 軸 | 選択肢 | 説明 |
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|-------------------|------------------------------------|-------------------------------|
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| A. 継続条件 | ① なし ② 単純 ③ 複合 | `loop(cond)` の `cond` |
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| B. 早期終了 | ① なし ② break ③ 条件付き break | ループを「抜ける」経路 |
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| C. スキップ | ① なし ② continue ③ 条件付き cont | 次のイテレーションに「飛ぶ」 |
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| D. PHI 分岐 | ① なし ② if‑PHI ③ match‑PHI | 条件に応じて値が変わるパターン |
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| E. 条件変数のスコープ | ① OuterLocal ② LoopBodyLocal | 条件で参照される変数の定義位置 |
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| F. キャリア更新 | ① 単一 ② 複数 ③ 条件付き | ループ内での状態更新パターン |
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この 6 軸は、それぞれ 2〜3 通りしかないので、理論上は最大 3×3×3×3×2×3=486 通りの組み合わせになるが、
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実際に意味のあるパターンはずっと少ない（10〜20 程度）ことが分かった。
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---
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## 2. 現在 JoinIR が正規化済みのパターン
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代表ループと対応する Pattern はだいたいこうなっている：
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| Pattern | 代表例 | A継続 | B終了 | Cスキップ | D‑PHI | E変数 | F更新 |
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|----------------|------------------------------|---------|--------------|-----------------|---------|------------|----------|
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| P1: Minimal | `loop_min_while.hako` | 単純 | なし | なし | なし | Outer | 単一 |
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| P2: Break | `joinir_min_loop.hako` | 単純 | 条件付きbreak | なし | なし | Outer | 単一 |
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| P3: If‑PHI | `loop_if_phi.hako` | 単純 | なし | なし | if‑PHI | Outer | 条件付き |
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| P4: Continue | `loop_continue_pattern4` | 単純 | なし | 条件付きcont | なし | Outer | 単一 |
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| P5: Trim‑like* | `TrimTest.trim`（設計中） | 単純 | 条件付きbreak | なし | なし | BodyLocal | 単一 |
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\*P5 は Phase 171 時点では「検出＋安全性判定」まで。実際の JoinIR lower は Phase 172 以降の仕事。
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ここまでで：
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- OuterLocal 条件（関数パラメータや外側ローカル）を持つ基本的な while/break/continue/if‑PHI は JoinIR で正規化済み。
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- LoopBodyLocal 条件（`local ch = ...; if ch == ' ' { break }`）は **LoopConditionScopeBox で Fail‑Fast** し、
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Trim パターンだけを LoopBodyCarrierPromoter/TrimLoopHelper で特例として扱う設計にしている。
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---
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## 3. これから増やす候補パターン
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実際の Nyash コードを見た上で、「出そうだな」と分かっているパターンをいくつか挙げておく。
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### P6: break + continue 同時
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```hako
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loop (cond) {
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if x { continue }
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if y { break }
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...
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}
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```
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- A: 単純
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- B: 条件付き break
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- C: 条件付き continue
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- E: OuterLocal 条件（が理想）
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### P7: 複数キャリア + 条件付き更新
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```hako
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loop (i < n) {
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if arr[i] > max { max = arr[i] }
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if arr[i] < min { min = arr[i] }
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i = i + 1
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}
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```
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- A: 単純
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- B: なし
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- C: なし
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- D: なし or if‑PHI に相当
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- F: 複数＋条件付き
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### P8: ネストループ（外側ループへの break/continue）
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```hako
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loop (i < n) {
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loop (j < m) {
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if cond { break outer } // labeled break
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}
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}
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```
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※ Nyash 言語仕様で outer break をどう扱うか次第で、JoinIR 側も変わる。
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### P9: match‑PHI
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```hako
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loop (i < n) {
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result = match state {
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"A" => compute_a()
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"B" => compute_b()
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}
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}
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```
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これは if‑PHI を複数ケースに拡張した形。JoinIR の If/Select/PHI パスを再利用できるはず。
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### P10: 無限ループ + 内部 break
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```hako
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loop (true) {
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if done { break }
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}
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```
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構造としては P2 の特殊ケース（A: 継続条件なし＋B: break）として扱える。
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### P11: 複合継続条件 + LoopBodyLocal
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```hako
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loop (i < n && is_valid) {
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local x = compute()
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is_valid = check(x)
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}
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```
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これは LoopBodyLocal 状態を継続条件に折り込むパターン。
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BoolExprLowerer + LoopBodyCarrierPromoter の拡張で扱える可能性がある。
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### P12: early return 内包
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```hako
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loop (i < n) {
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if error { return null } // ループを抜けて関数終了
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}
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```
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ループ exit と関数 exit が混ざるパターン。ExitLine とは別に「関数全体の戻り値ライン」とどう噛ませるかの設計が必要。
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---
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## 4. 収束性について
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- 各軸が有限個の状態しか取らないこと、
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- 多くの組み合わせが意味を持たない／禁止パターンであること（無限ループ、進まないループなど）
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から、JoinIR で真面目に扱うべきループ形は **高々数十種類** に収束する。
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実運用上の優先順としては：
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1. P1–P4: 基本パターン（すでに実装済み）
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2. P5: Trim / JsonParser で現実に必要な LoopBodyLocal 条件の一部（昇格可能なもの）
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3. P6, P7, P12: パーサ／集計／エラー処理で頻出
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4. P8, P9, P11: 言語仕様や実アプリのニーズを見ながら段階的に
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という順で Box を増やしていけば、「パターン爆発」にはならずに済む想定だよ。
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---
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## 5. 関連ドキュメント
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- `joinir-architecture-overview.md`
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JoinIR 全体の箱と契約。Loop/If/ExitLine/Boundary/条件式ラインの全体図。
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- `phase33-16-design.md`, `PHASE_33_16_SUMMARY.md`
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Loop header PHI / ExitLine / Boundary 再設計の詳細。
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- `phase166-jsonparser-loop-recheck.md`
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JsonParserBox / Trim 系ループのインベントリと、どの Pattern に入るかの観測ログ。
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- `phase171-pattern5-loop-inventory.md`
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Trim/JsonParser 向け Pattern5（LoopBodyLocal 条件）設計の進捗。
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345
docs/development/current/main/phase172-trim-lowering-impl.md
Normal file
345
docs/development/current/main/phase172-trim-lowering-impl.md
Normal file
@ -0,0 +1,345 @@
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# Phase 172: Trim Pattern JoinIR Lowering Implementation
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## Objective
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Implement actual JoinIR → MIR lowering for Trim pattern loops, making `test_trim_main_pattern.hako` work end-to-end.
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## Target Loop
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**File**: `local_tests/test_trim_main_pattern.hako`
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**Leading whitespace trim loop**:
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```nyash
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loop(start < end) {
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local ch = s.substring(start, start+1)
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if ch == " " || ch == "\t" || ch == "\n" || ch == "\r" {
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start = start + 1
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} else {
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break
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}
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}
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```
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## Using Boxes from Phase 171
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### Phase 171 Infrastructure
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- ✅ **LoopConditionScopeBox**: Detects `ch` as LoopBodyLocal
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- ✅ **LoopBodyCarrierPromoter**: Promotes `ch` to bool carrier `is_ch_match`
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- ✅ **TrimPatternInfo**: Contains promotion metadata
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- ✅ **TrimLoopHelper**: Attached to CarrierInfo for lowering guidance
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- ✅ **Pattern2 validation**: Currently returns informative error at line 234-239
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## Design Philosophy
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### Responsibility Separation
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**Host MIR Side** (before/after JoinIR):
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- Execute `substring()` method calls
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- Evaluate OR chain comparisons (`ch == " " || ch == "\t" || ...`)
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- Generate bool result for carrier
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- BoxCall operations
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**JoinIR Side** (pure control flow):
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- bool carrier-based loop control
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- break condition: `!is_ch_match`
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- No knowledge of substring/OR chain
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- No new JoinIR instructions
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### Key Insight
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The Trim pattern transformation:
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```
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Original:
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local ch = s.substring(start, start+1)
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if (ch == " " || ch == "\t" || ...) { start++ } else { break }
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Transformed:
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is_ch_match = (s.substring(start, start+1) == " " || ...) # Host MIR
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if (!is_ch_match) { break } # JoinIR
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```
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## Implementation Steps
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### Step 1: Loop Pre-Initialization (Task 172-2)
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**Location**: `pattern2_with_break.rs`, before JoinIR generation
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**Goal**: Initialize bool carrier before entering loop
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**Implementation**:
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```rust
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// After Line 264 (after carrier_info.merge_from)
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if let Some(helper) = carrier_info.trim_helper() {
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if helper.is_safe_trim() {
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// Generate initial whitespace check
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// ch0 = s.substring(start, start+1)
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let ch0 = self.emit_method_call("substring", s_id, vec![start_id, start_plus_1_id])?;
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// is_ch_match0 = (ch0 == " " || ch0 == "\t" || ...)
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let is_ch_match0 = emit_whitespace_check(self, ch0, &helper.whitespace_chars)?;
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// Update carrier_info initial value
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// (Will be used in JoinIR input mapping)
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}
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}
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```
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**Helper Function** (new):
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```rust
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fn emit_whitespace_check(
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builder: &mut MirBuilder,
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ch_value: ValueId,
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whitespace_chars: &[String],
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) -> Result<ValueId, String> {
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// Build OR chain: ch == " " || ch == "\t" || ...
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let mut result = None;
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for ws_char in whitespace_chars {
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let ws_const = emit_string(builder, ws_char.clone());
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let eq_check = emit_eq_to(builder, ch_value, ws_const)?;
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result = Some(if let Some(prev) = result {
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// prev || eq_check
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emit_binary_op(builder, BinaryOp::Or, prev, eq_check)?
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} else {
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eq_check
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});
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}
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result.ok_or("Empty whitespace_chars".to_string())
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}
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```
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### Step 2: Loop Body Update Logic (Task 172-3)
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**Location**: Pattern2 lowerer's latch generation (after `start = start + 1`)
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**Goal**: Update bool carrier for next iteration
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**Implementation**:
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```rust
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// In latch block generation (conceptually after line 267+)
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if let Some(helper) = carrier_info.trim_helper() {
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if helper.is_safe_trim() {
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// ch_next = s.substring(start_next, start_next+1)
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let ch_next = self.emit_method_call("substring", s_id, vec![start_next, start_next_plus_1])?;
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// is_ch_match_next = (ch_next == " " || ...)
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let is_ch_match_next = emit_whitespace_check(self, ch_next, &helper.whitespace_chars)?;
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// Store for JoinIR latch → header PHI
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// (Will be used in carrier update mapping)
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}
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}
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```
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**Note**: The actual MIR emission happens in **host space**, not JoinIR space. The JoinIR only sees the bool carrier as a loop parameter.
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### Step 3: JoinIR break Condition Replacement (Task 172-4)
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**Location**: `lower_loop_with_break_minimal` call at line 267
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**Goal**: Replace break condition with `!is_ch_match`
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**Current Code**:
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```rust
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let (join_module, fragment_meta) = match lower_loop_with_break_minimal(
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scope,
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condition, // loop condition: start < end
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&break_condition_node, // if condition: ch == " " || ...
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&env,
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&loop_var_name
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) { ... }
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```
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**Modified Approach**:
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```rust
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// Phase 172: Trim pattern special route
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if let Some(helper) = carrier_info.trim_helper() {
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if helper.is_safe_trim() {
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// Create negated carrier check: !is_ch_match
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let carrier_var_node = ASTNode::Variable {
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name: helper.carrier_name.clone(), // "is_ch_match"
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span: Span::unknown(),
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};
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let negated_carrier_check = ASTNode::UnaryOp {
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operator: UnaryOperator::Not,
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operand: Box::new(carrier_var_node),
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span: Span::unknown(),
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};
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// Use negated carrier as break condition
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let (join_module, fragment_meta) = match lower_loop_with_break_minimal(
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scope,
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condition, // start < end (unchanged)
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&negated_carrier_check, // !is_ch_match (REPLACED)
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&env,
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&loop_var_name
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) { ... }
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// Continue with normal merge flow...
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||||
}
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}
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```
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**Critical Design Decision**:
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- The break condition AST is replaced, but the loop condition (`start < end`) remains unchanged
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- JoinIR sees bool carrier as just another loop parameter
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- No new JoinIR instructions needed!
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### Step 4: Carrier Mapping Integration
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**Location**: Boundary setup (line 283-291)
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|
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**Goal**: Ensure bool carrier is properly mapped between host and JoinIR
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||||
|
||||
**Current boundary setup**:
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```rust
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let mut boundary = JoinInlineBoundary::new_inputs_only(
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vec![ValueId(0)], // JoinIR: loop param
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vec![loop_var_id], // Host: "start"
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);
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boundary.condition_bindings = condition_bindings;
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boundary.exit_bindings = exit_bindings.clone();
|
||||
```
|
||||
|
||||
**Enhanced with Trim carrier**:
|
||||
```rust
|
||||
// Phase 172: Add bool carrier to condition_bindings
|
||||
if let Some(helper) = carrier_info.trim_helper() {
|
||||
let carrier_host_id = self.variable_map.get(&helper.carrier_name)
|
||||
.copied()
|
||||
.ok_or_else(|| format!("Carrier '{}' not in variable_map", helper.carrier_name))?;
|
||||
|
||||
let carrier_join_id = alloc_join_value(); // Allocate JoinIR-local ID
|
||||
|
||||
env.insert(helper.carrier_name.clone(), carrier_join_id);
|
||||
condition_bindings.push(ConditionBinding {
|
||||
name: helper.carrier_name.clone(),
|
||||
host_value: carrier_host_id,
|
||||
join_value: carrier_join_id,
|
||||
});
|
||||
}
|
||||
```
|
||||
|
||||
## Implementation Constraints
|
||||
|
||||
### What We DON'T Change
|
||||
|
||||
1. **ExitLine Architecture**: No changes to ExitLineReconnector/ExitMetaCollector
|
||||
2. **Header PHI Generation**: Existing LoopHeaderPhiBuilder handles bool carrier automatically
|
||||
3. **JoinIR Instruction Set**: No new instructions added
|
||||
4. **Pattern2 Basic Logic**: Core control flow unchanged
|
||||
|
||||
### What We DO Change
|
||||
|
||||
1. **Pre-loop initialization**: Add bool carrier setup
|
||||
2. **Latch update logic**: Add bool carrier update
|
||||
3. **Break condition AST**: Replace with `!is_ch_match`
|
||||
4. **Condition bindings**: Add bool carrier mapping
|
||||
|
||||
## Testing Strategy
|
||||
|
||||
### E2E Test
|
||||
|
||||
**Command**:
|
||||
```bash
|
||||
./target/release/hakorune local_tests/test_trim_main_pattern.hako
|
||||
```
|
||||
|
||||
**Expected Behavior**:
|
||||
- **Before**: Error message "✅ Trim pattern validation successful! ... JoinIR lowering: TODO"
|
||||
- **After**: `Result: [hello]` and `PASS: Trimmed correctly`
|
||||
|
||||
### Debug Traces
|
||||
|
||||
**With JoinIR debug**:
|
||||
```bash
|
||||
NYASH_JOINIR_DEBUG=1 ./target/release/hakorune local_tests/test_trim_main_pattern.hako 2>&1 | grep -E "\[pattern2\]|\[trim\]"
|
||||
```
|
||||
|
||||
**Expected log patterns**:
|
||||
```
|
||||
[pattern2/promotion] LoopBodyLocal detected in condition scope
|
||||
[pattern2/promoter] LoopBodyLocal 'ch' promoted to carrier 'is_ch_match'
|
||||
[pattern2/trim] Safe Trim pattern detected, bypassing LoopBodyLocal restriction
|
||||
[pattern2/trim] Carrier: 'is_ch_match', original var: 'ch', whitespace chars: [" ", "\t", "\n", "\r"]
|
||||
[pattern2/trim] Emitting whitespace check initialization
|
||||
[pattern2/trim] Replacing break condition with !is_ch_match
|
||||
```
|
||||
|
||||
### MIR Validation
|
||||
|
||||
**Dump MIR**:
|
||||
```bash
|
||||
./target/release/hakorune --dump-mir local_tests/test_trim_main_pattern.hako 2>&1 | less
|
||||
```
|
||||
|
||||
**Check for**:
|
||||
- Pre-loop: `substring()` call + OR chain comparison
|
||||
- Loop header: PHI for `is_ch_match`
|
||||
- Loop body: Conditional branch on `!is_ch_match`
|
||||
- Loop latch: `substring()` call + OR chain update
|
||||
- Exit block: Proper carrier value propagation
|
||||
|
||||
## Success Criteria
|
||||
|
||||
1. ✅ `test_trim_main_pattern.hako` executes without errors
|
||||
2. ✅ Output: `Result: [hello]` (correctly trimmed)
|
||||
3. ✅ Test result: `PASS: Trimmed correctly`
|
||||
4. ✅ `cargo build --release` succeeds with 0 errors
|
||||
5. ✅ `cargo test` all tests pass
|
||||
6. ✅ No new warnings introduced
|
||||
7. ✅ MIR dump shows proper SSA form
|
||||
|
||||
## Implementation Status
|
||||
|
||||
- [ ] Task 172-1: Design document (THIS FILE)
|
||||
- [ ] Task 172-2: Loop pre-initialization
|
||||
- [ ] Task 172-3: Loop body update logic
|
||||
- [ ] Task 172-4: JoinIR break condition replacement
|
||||
- [ ] Task 172-5: E2E test validation
|
||||
- [ ] Task 172-6: Documentation update
|
||||
|
||||
## Future Work (Out of Scope for Phase 172)
|
||||
|
||||
### Pattern 4 Support
|
||||
- Apply same Trim lowering to Pattern 4 (loop with continue)
|
||||
- Reuse `emit_whitespace_check()` helper
|
||||
|
||||
### JsonParser Integration
|
||||
- Apply to all trim loops in JsonParser._trim
|
||||
- Validate with JSON parsing smoke tests
|
||||
|
||||
### P6+ Patterns
|
||||
- Complex control flow with Trim-like patterns
|
||||
- Multi-carrier bool promotion
|
||||
|
||||
## Notes
|
||||
|
||||
### Why This Design Works
|
||||
|
||||
1. **Minimal Invasiveness**: Changes only affect Trim-specific paths
|
||||
2. **Reusability**: `emit_whitespace_check()` can be shared with Pattern 4
|
||||
3. **Maintainability**: Clear separation between host MIR and JoinIR concerns
|
||||
4. **Testability**: Each step can be validated independently
|
||||
|
||||
### Phase 171 Validation Hook
|
||||
|
||||
Current code (line 234-239) already validates Trim pattern and returns early:
|
||||
```rust
|
||||
return Err(format!(
|
||||
"[cf_loop/pattern2] ✅ Trim pattern validation successful! \
|
||||
Carrier '{}' ready for Phase 172 implementation. \
|
||||
(Pattern detection: PASS, Safety check: PASS, JoinIR lowering: TODO)",
|
||||
helper.carrier_name
|
||||
));
|
||||
```
|
||||
|
||||
Phase 172 will **replace this early return** with actual lowering logic.
|
||||
|
||||
## References
|
||||
|
||||
- **Phase 171-C**: LoopBodyCarrierPromoter implementation
|
||||
- **Phase 171-C-5**: TrimLoopHelper design
|
||||
- **Pattern2 Lowerer**: `src/mir/builder/control_flow/joinir/patterns/pattern2_with_break.rs`
|
||||
- **Test File**: `local_tests/test_trim_main_pattern.hako`
|
||||
Reference in New Issue
Block a user