feat(phase-91): JoinIR Selfhost depth-2 advancement - Pattern P5b design & planning
## Overview Analyzed 34 loops across selfhost codebase to identify JoinIR coverage gaps. Current readiness: 47% (16/30 loops). Next frontier: Pattern P5b (Escape Handling). ## Current Status - Phase 91 planning document: Complete - Loop inventory across 6 key files - Priority ranking: P5b (escape) > P5 (guard) > P6 (nested) - Effort estimates and ROI analysis - Pattern P5b Design: Complete - Problem statement (variable-step carriers) - Pattern definition with Skeleton layout - Recognition algorithm (8-step detection) - Capability taxonomy (P5b-specific guards) - Lowering strategy (Phase 92 preview) - Test fixture: Created - Minimal escape sequence parser - JSON string with backslash escape - Loop Canonicalizer extended - Capability table updated with P5b entries - Fail-Fast criteria documented - Implementation checklist added ## Key Findings ### Loop Readiness Matrix | Category | Count | JoinIR Status | |----------|-------|--------------| | Pattern 1 (simple bounded) | 16 | ✅ Ready | | Pattern 2 (with break) | 1 | ⚠️ Partial | | **Pattern P5b (escape seq)** | ~3 | ❌ NEW | | Pattern P5 (guard-bounded) | ~2 | ❌ Deferred | | Pattern P6 (nested loops) | ~8 | ❌ Deferred | ### Top Candidates 1. **P5b**: json_loader.hako:30 (8 lines, high reuse) - Effort: 2-3 days (recognition) - Impact: Unlocks all escape parsers 2. **P5**: mini_vm_core.hako:541 (204 lines, monolithic) - Effort: 1-2 weeks - Impact: Major JSON optimization 3. **P6**: seam_inspector.hako:76 (7+ nesting) - Effort: 2-3 weeks - Impact: Demonstrates nested composition ## Phase 91 Strategy **Recognition-only phase** (no lowering in P1): - Step 1: Design & planning ✅ - Step 2: Canonicalizer implementation (detect_escape_pattern) - Step 3: Unit tests + parity verification - Step 4: Lowering deferred to Phase 92 ## Files Added - docs/development/current/main/phases/phase-91/README.md - Full analysis & planning - docs/development/current/main/design/pattern-p5b-escape-design.md - Technical design - tools/selfhost/test_pattern5b_escape_minimal.hako - Test fixture ## Files Modified - docs/development/current/main/design/loop-canonicalizer.md - Capability table extended with P5b entries - Pattern P5b full section added - Implementation checklist updated ## Acceptance Criteria (Phase 91 Step 1) - ✅ Loop inventory complete (34 loops across 6 files) - ✅ Pattern P5b design document ready - ✅ Test fixture created - ✅ Capability taxonomy extended - ⏳ Implementation deferred (Step 2+) ## References - JoinIR Architecture: joinir-architecture-overview.md - Phase 91 Plan: phases/phase-91/README.md - P5b Design: design/pattern-p5b-escape-design.md Next: Implement detect_escape_pattern() recognition in Phase 91 Step 2 🤖 Generated with Claude Code Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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nyash-codex
@ -295,16 +295,26 @@ pub enum CarrierRole {
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Skeleton を生成できても lower/merge できるとは限らない。以下の Capability で判定する：
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| Capability | 説明 | 未達時の理由タグ |
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|--------------------------|------------------------------------------|-------------------------------------|
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| `ConstStepIncrement` | キャリア更新が定数ステップ（i=i+const） | `CAP_MISSING_CONST_STEP` |
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| `SingleBreakPoint` | break が単一箇所のみ | `CAP_MISSING_SINGLE_BREAK` |
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| `SingleContinuePoint` | continue が単一箇所のみ | `CAP_MISSING_SINGLE_CONTINUE` |
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| `NoSideEffectInHeader` | ループ条件に副作用がない | `CAP_MISSING_PURE_HEADER` |
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| `OuterLocalCondition` | 条件変数が外側スコープで定義済み | `CAP_MISSING_OUTER_LOCAL_COND` |
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| `ExitBindingsComplete` | 境界へ渡す値が過不足ない | `CAP_MISSING_EXIT_BINDINGS` |
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| `CarrierPromotion` | LoopBodyLocal を昇格可能 | `CAP_MISSING_CARRIER_PROMOTION` |
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| `BreakValueConsistent` | break 値の型が一貫 | `CAP_MISSING_BREAK_VALUE_TYPE` |
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| Capability | 説明 | 未達時の理由タグ | Pattern対応 |
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|--------------------------|------------------------------------------|-------------------------------------|------------|
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| `ConstStepIncrement` | キャリア更新が定数ステップ（i=i+const） | `CAP_MISSING_CONST_STEP` | P1-P5 |
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| `SingleBreakPoint` | break が単一箇所のみ | `CAP_MISSING_SINGLE_BREAK` | P1-P5 |
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| `SingleContinuePoint` | continue が単一箇所のみ | `CAP_MISSING_SINGLE_CONTINUE` | P4 |
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| `NoSideEffectInHeader` | ループ条件に副作用がない | `CAP_MISSING_PURE_HEADER` | P1-P5 |
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| `OuterLocalCondition` | 条件変数が外側スコープで定義済み | `CAP_MISSING_OUTER_LOCAL_COND` | P1-P5 |
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| `ExitBindingsComplete` | 境界へ渡す値が過不足ない | `CAP_MISSING_EXIT_BINDINGS` | P1-P5 |
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| `CarrierPromotion` | LoopBodyLocal を昇格可能 | `CAP_MISSING_CARRIER_PROMOTION` | P2-P3 |
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| `BreakValueConsistent` | break 値の型が一貫 | `CAP_MISSING_BREAK_VALUE_TYPE` | P2-P5 |
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| `EscapeSequencePattern` | エスケープシーケンス対応（P5b専用） | `CAP_MISSING_ESCAPE_PATTERN` | **P5b** |
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**新規 P5b 関連 Capability**:
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| Capability | 説明 | 必須条件 |
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|--------------------------|------------------------------------------|---------------------------------------|
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| `ConstEscapeDelta` | escape_delta が定数 | `if ch == "\\" { i = i + const }` |
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| `ConstNormalDelta` | normal_delta が定数 | `i = i + const` (after escape block) |
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| `SingleEscapeCheck` | escape check が単一箇所のみ | 複数の escape 処理がない |
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| `ClearBoundaryCondition` | 文字列終端検出が明確 | `if ch == boundary { break }` |
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### 語彙の安定性
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@ -365,7 +375,7 @@ pub struct RoutingDecision {
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---
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## 最初の対象ループ: skip_whitespace（受け入れ基準）
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## 対象ループ 1: skip_whitespace（受け入れ基準）
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### 対象ファイル
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@ -410,6 +420,120 @@ loop(p < len) {
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---
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## 対象ループ 2: Pattern P5b - Escape Sequence Handling（Phase 91 新規）
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### 目的
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エスケープシーケンス対応ループを JoinIR 対象に拡大する。JSON/CSV パーサーの文字列処理で共通パターン。
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### 対象ファイル
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`tools/selfhost/test_pattern5b_escape_minimal.hako`
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```hako
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loop(i < n) {
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local ch = s.substring(i, i+1)
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if ch == "\"" { break } // String boundary
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if ch == "\\" {
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i = i + 1 // Skip escape character (conditional +2 total)
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ch = s.substring(i, i+1) // Read escaped character
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}
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out = out + ch // Process character
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i = i + 1 // Standard increment
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}
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```
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### Pattern P5b の特徴
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| 特性 | 説明 |
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|-----|------|
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| **Header** | `loop(i < n)` - Bounded loop on string length |
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| **Escape Check** | `if ch == escape_char { i = i + escape_delta }` |
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| **Normal Increment** | `i = i + 1` (always +1) |
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| **Accumulator** | `out = out + char` - String append pattern |
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| **Boundary** | `if ch == boundary { break }` - String terminator |
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| **Carriers** | Position (`i`), Accumulator (`out`) |
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| **Deltas** | normal_delta=1, escape_delta=2 (or variable) |
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### 必要 Capability (P5b 拡張)
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- ✅ `ConstStepIncrement` (normal: i = i + 1)
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- ✅ `SingleBreakPoint` (boundary check only)
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- ✅ `NoSideEffectInHeader` (i < n は pure)
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- ✅ `OuterLocalCondition` (i, n は外側定義)
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- ✅ **`ConstEscapeDelta`** (escape: i = i + 2, etc.) - **P5b 専用**
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- ✅ **`SingleEscapeCheck`** (one escape pattern only) - **P5b 専用**
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- ✅ **`ClearBoundaryCondition`** (explicit boundary detection) - **P5b 専用**
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### Fail-Fast 基準 (P5b 非対応のケース)
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以下のいずれかに該当する場合、Fail-Fast:
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1. **複数エスケープチェック**: `if ch == "\\" ... if ch2 == "'" ...`
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- 理由: `CAP_MISSING_SINGLE_ESCAPE_CHECK`
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2. **可変ステップ**: `i = i + var` (定数でない)
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- 理由: `CAP_MISSING_CONST_ESCAPE_DELTA`
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3. **無条件に近いループ**: `loop(true)` without clear boundary
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- 理由: `CAP_MISSING_CLEAR_BOUNDARY_CONDITION`
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4. **複数 break 点**: String boundary + escape processing で exit
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- 理由: `CAP_MISSING_SINGLE_BREAK`
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### 認識アルゴリズム (高レベル)
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```
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1. Header carrier 抽出: loop(i < n) から i を取得
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2. Escape check block 発見: if ch == "\" { ... }
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3. Escape delta 抽出: i = i + const
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4. Accumulator パターン発見: out = out + ch
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5. Normal increment 抽出: i = i + 1 (escape if block 外)
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6. Boundary check 発見: if ch == "\"" { break }
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7. LoopSkeleton 構築
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- carriers: [i (dual deltas), out (append)]
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- exits: has_break=true
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8. RoutingDecision: Pattern5bEscape
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```
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### 実装予定 (Phase 91)
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**Step 1** (このドキュメント):
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- [ ] Pattern P5b 設計書完成 ✅
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- [ ] テストフィクスチャ作成 ✅
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- [ ] Capability 定義追加 ✅
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**Step 2** (Phase 91 本実装):
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- [ ] `detect_escape_pattern()` in Canonicalizer
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- [ ] Unit tests (P5b recognition)
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- [ ] Parity verification (strict mode)
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- [ ] Documentation update
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**Step 3** (Phase 92 lowering):
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- [ ] Pattern5bEscape lowerer 実装
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- [ ] E2E test with escape fixture
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- [ ] VM/LLVM parity verification
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### 受け入れ基準 (Phase 91)
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1. ✅ Canonicalizer が escape pattern を認識
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2. ✅ RoutingDecision.chosen == Pattern5bEscape
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3. ✅ missing_caps == [] (すべての capability 満たす)
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4. ✅ Strict parity green (`HAKO_JOINIR_STRICT=1`)
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5. ✅ 既存テスト退行なし
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6. ❌ Lowering は Step 3 へ (Phase 91 では recognition のみ)
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### References
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- **P5b 詳細設計**: `docs/development/current/main/design/pattern-p5b-escape-design.md`
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- **テストフィクスチャ**: `tools/selfhost/test_pattern5b_escape_minimal.hako`
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- **Phase 91 計画**: `docs/development/current/main/phases/phase-91/README.md`
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---
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## 追加・変更チェックリスト
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- [ ] 追加するループ形を最小 fixture に落とす（再現固定）
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