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>
This commit is contained in:
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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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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| Capability | 説明 | 未達時の理由タグ | Pattern対応 |
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|--------------------------|------------------------------------------|-------------------------------------|
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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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| `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` |
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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` |
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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` |
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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` |
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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` |
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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` |
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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` |
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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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### 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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---
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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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### 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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---
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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・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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- [ ] 追加するループ形を最小 fixture に落とす（再現固定）
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@ -0,0 +1,502 @@
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# Pattern P5b: Escape Sequence Handling
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## Overview
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**Pattern P5b** extends JoinIR loop recognition to handle **variable-step carriers** in escape sequence parsing.
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This pattern is essential for:
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- JSON string parsers
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- CSV readers
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- Template engine string processing
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- Any escape-aware text processing loop
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## Problem Statement
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### Current Limitation
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Standard Pattern 1-4 carriers always update by constant deltas:
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```
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Carrier i: i = i + 1 (always +1)
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```
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Escape sequences require conditional increments:
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```
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if escape_char { i = i + 2 } // Skip both escape char and escaped char
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else { i = i + 1 } // Normal increment
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```
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**Why this matters**:
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- Common in string parsing (JSON, CSV, config files)
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- Appears in ~3 selfhost loops
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- Currently forces Fail-Fast (pattern not supported)
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- Could benefit from JoinIR exit-line optimization
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### Real-World Example: JSON String Reader
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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 } // End of string
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if ch == "\\" {
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i = i + 1 // <-- CONDITIONAL: skip escape char
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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 // <-- UNCONDITIONAL: advance
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}
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```
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Loop progression:
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- Normal case: `i` advances by 1
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- Escape case: `i` advances by 2 (skip inside if + final increment)
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## Pattern Definition
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### Canonical Form
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```
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LoopSkeleton {
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steps: [
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HeaderCond(carrier < limit),
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Body(escape_check_block),
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Body(process_block),
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Update(carrier_increments)
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]
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}
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```
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### Header Contract
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**Requirement**: Bounded loop on single integer carrier
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```
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loop(i < n) ✅ Valid P5b header
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loop(i < 100) ✅ Valid P5b header
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loop(i <= n) ✅ Valid P5b header (edge case)
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loop(true) ❌ Not P5b (unbounded)
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loop(i < n && j < m) ❌ Not P5b (multi-carrier condition)
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```
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**Carrier**: Must be loop variable used in condition
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### Escape Check Contract
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**Requirement**: Conditional increment based on character test
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#### Escape Detection Block
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```
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if ch == escape_char {
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carrier = carrier + escape_delta
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// Optional: read next character
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ch = s.substring(carrier, carrier+1)
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}
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```
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**Escape character**: Typically `\\` (backslash), but can vary
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- JSON: `\\`
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- CSV: `"` (context-dependent)
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- Custom: Any single-character escape
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**Escape delta**: How far to skip
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- `+1`: Skip just the escape marker
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- `+2`: Skip escape marker + escaped char (common case)
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- `+N`: Other values possible
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#### Detection Algorithm
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1. **Find if statement in loop body**
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2. **Check condition**: `ch == literal_char`
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3. **Extract escape character**: The literal constant
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4. **Find assignment in if block**: `carrier = carrier + <const>`
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5. **Calculate escape_delta**: The constant value
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6. **Validate**: Escape delta > 0
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### Process Block Contract
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**Requirement**: Character accumulation with optional processing
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```
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out = out + ch ✅ Simple append
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result = result + ch ✅ Any accumulator
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s = s + value ❌ Not append pattern
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```
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**Accumulator carrier**: String-like box supporting append
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### Update Block Contract
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**Requirement**: Unconditional carrier increment after escape check
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```
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carrier = carrier + normal_delta
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```
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**Normal delta**: Almost always `+1`
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- Defines "normal" loop progress
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- Only incremented once per iteration (not in escape block)
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#### Detection Algorithm
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1. **Find assignment after escape if block**
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2. **Pattern**: `carrier = carrier + <const>`
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3. **Must be unconditional** (outside any if block)
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4. **Extract normal_delta**: The constant
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### Break Requirement
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**Requirement**: Explicit break on string boundary
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```
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if ch == boundary_char { break }
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```
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||||||
|
**Boundary character**: Typically quote `"`
|
||||||
|
- JSON: `"`
|
||||||
|
- Custom strings: Any delimiter
|
||||||
|
|
||||||
|
**Position in loop**: Usually before escape check
|
||||||
|
|
||||||
|
### Exit Contract for P5b
|
||||||
|
|
||||||
|
```rust
|
||||||
|
ExitContract {
|
||||||
|
has_break: true, // Always for escape patterns
|
||||||
|
has_continue: false,
|
||||||
|
has_return: false,
|
||||||
|
carriers: vec![
|
||||||
|
CarrierInfo {
|
||||||
|
name: "i", // Loop variable
|
||||||
|
deltas: [
|
||||||
|
normal_delta, // e.g., 1
|
||||||
|
escape_delta // e.g., 2
|
||||||
|
]
|
||||||
|
},
|
||||||
|
CarrierInfo {
|
||||||
|
name: "out", // Accumulator
|
||||||
|
pattern: Append
|
||||||
|
}
|
||||||
|
]
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
## Capability Analysis
|
||||||
|
|
||||||
|
### Required Capabilities (CapabilityTag)
|
||||||
|
|
||||||
|
For Pattern P5b to be JoinIR-compatible, these must be present:
|
||||||
|
|
||||||
|
| Capability | Meaning | P5b Requirement | Status |
|
||||||
|
|------------|---------|-----------------|--------|
|
||||||
|
| `ConstStep` | Carrier updates are constants | ✅ Required | Both deltas constant |
|
||||||
|
| `SingleBreak` | Only one break point | ✅ Required | String boundary only |
|
||||||
|
| `PureHeader` | Condition has no side effects | ✅ Required | `i < n` is pure |
|
||||||
|
| `OuterLocalCond` | Condition doesn't reference locals | ⚠️ Soft req | Usually true |
|
||||||
|
| `ExitBindings` | Exit block is simple | ✅ Required | Break is unconditional |
|
||||||
|
|
||||||
|
### Missing Capabilities (Fail-Fast Reasons)
|
||||||
|
|
||||||
|
If any of these are detected, Pattern P5b is rejected:
|
||||||
|
|
||||||
|
| Capability | Why It Blocks P5b | Example |
|
||||||
|
|------------|-------------------|---------|
|
||||||
|
| `MultipleBreak` | Multiple exit points | `if x { break } if y { break }` |
|
||||||
|
| `MultipleCarriers` | Condition uses multiple vars | `loop(i < n && j < m)` |
|
||||||
|
| `VariableStep` | Deltas aren't constants | `i = i + adjustment` |
|
||||||
|
| `NestedEscape` | Escape check inside other if | `if outer { if ch == \\ ... }` |
|
||||||
|
|
||||||
|
## Recognition Algorithm
|
||||||
|
|
||||||
|
### High-Level Steps
|
||||||
|
|
||||||
|
1. **Extract header carrier**: `i` from `loop(i < n)`
|
||||||
|
2. **Find escape check**: `if ch == "\\"`
|
||||||
|
3. **Find escape increment**: `i = i + 2` inside if
|
||||||
|
4. **Find process block**: `out = out + ch`
|
||||||
|
5. **Find normal increment**: `i = i + 1` after if
|
||||||
|
6. **Find break condition**: `if ch == "\"" { break }`
|
||||||
|
7. **Build ExitContract** with both deltas
|
||||||
|
8. **Build RoutingDecision**: Pattern5bEscape if all present
|
||||||
|
|
||||||
|
### Pseudo-Code
|
||||||
|
|
||||||
|
```rust
|
||||||
|
fn detect_escape_pattern(loop_expr: &Expr) -> Option<EscapePatternInfo> {
|
||||||
|
// Step 1: Extract loop variable
|
||||||
|
let (carrier_name, limit) = extract_header_carrier(loop_expr)?;
|
||||||
|
|
||||||
|
// Step 2: Find escape check statement
|
||||||
|
let escape_stmts = find_escape_check_block(loop_body)?;
|
||||||
|
|
||||||
|
// Step 3: Extract escape character
|
||||||
|
let escape_char = extract_escape_literal(escape_stmts)?;
|
||||||
|
|
||||||
|
// Step 4: Extract escape delta
|
||||||
|
let escape_delta = extract_escape_increment(escape_stmts, carrier_name)?;
|
||||||
|
|
||||||
|
// Step 5: Find process statements
|
||||||
|
let process_stmts = find_character_accumulation(loop_body)?;
|
||||||
|
|
||||||
|
// Step 6: Extract normal increment
|
||||||
|
let normal_delta = extract_normal_increment(loop_body, carrier_name)?;
|
||||||
|
|
||||||
|
// Step 7: Find break condition
|
||||||
|
let break_char = extract_break_literal(loop_body)?;
|
||||||
|
|
||||||
|
// Build result
|
||||||
|
Some(EscapePatternInfo {
|
||||||
|
carrier_name,
|
||||||
|
escape_char,
|
||||||
|
normal_delta,
|
||||||
|
escape_delta,
|
||||||
|
break_char,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
### Implementation Location
|
||||||
|
|
||||||
|
**File**: `src/mir/loop_canonicalizer/canonicalizer.rs`
|
||||||
|
|
||||||
|
**Function**: `detect_escape_pattern()` (new)
|
||||||
|
|
||||||
|
**Integration point**: `canonicalize_loop_expr()` main dispatch
|
||||||
|
|
||||||
|
**Priority**: Call before `detect_skip_whitespace_pattern()` (more specific)
|
||||||
|
|
||||||
|
## Skeleton Representation
|
||||||
|
|
||||||
|
### Standard Layout
|
||||||
|
|
||||||
|
```
|
||||||
|
LoopSkeleton {
|
||||||
|
header: HeaderCond(Condition {
|
||||||
|
operator: LessThan,
|
||||||
|
left: Var("i"),
|
||||||
|
right: Var("n")
|
||||||
|
}),
|
||||||
|
|
||||||
|
steps: [
|
||||||
|
// Escape check block
|
||||||
|
SkeletonStep::Body(vec![
|
||||||
|
Expr::If {
|
||||||
|
cond: Comparison("ch", Eq, Literal("\\")),
|
||||||
|
then_body: [
|
||||||
|
Expr::Assign("i", Add, 1), // escape_delta
|
||||||
|
Expr::Assign("ch", Substring("s", Var("i"), Add(Var("i"), 1))),
|
||||||
|
]
|
||||||
|
}
|
||||||
|
]),
|
||||||
|
|
||||||
|
// Character accumulation
|
||||||
|
SkeletonStep::Body(vec![
|
||||||
|
Expr::Assign("out", Append, Var("ch")),
|
||||||
|
]),
|
||||||
|
|
||||||
|
// Normal increment
|
||||||
|
SkeletonStep::Update(vec![
|
||||||
|
Expr::Assign("i", Add, 1), // normal_delta
|
||||||
|
]),
|
||||||
|
],
|
||||||
|
|
||||||
|
carriers: vec![
|
||||||
|
CarrierSlot {
|
||||||
|
name: "i",
|
||||||
|
deltas: [1, 2], // [normal, escape]
|
||||||
|
// ... other fields
|
||||||
|
},
|
||||||
|
CarrierSlot {
|
||||||
|
name: "out",
|
||||||
|
pattern: Append,
|
||||||
|
// ... other fields
|
||||||
|
}
|
||||||
|
],
|
||||||
|
|
||||||
|
exit_contract: ExitContract {
|
||||||
|
has_break: true,
|
||||||
|
// ...
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
## RoutingDecision Output
|
||||||
|
|
||||||
|
### For Valid P5b Pattern
|
||||||
|
|
||||||
|
```rust
|
||||||
|
RoutingDecision {
|
||||||
|
chosen: Pattern5bEscape,
|
||||||
|
missing_caps: vec![],
|
||||||
|
notes: vec![
|
||||||
|
"escape_char: \\",
|
||||||
|
"normal_delta: 1",
|
||||||
|
"escape_delta: 2",
|
||||||
|
"break_char: \"",
|
||||||
|
"accumulator: out",
|
||||||
|
],
|
||||||
|
confidence: High,
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
### For Invalid/Unsupported Cases
|
||||||
|
|
||||||
|
```rust
|
||||||
|
// Multiple escapes detected
|
||||||
|
RoutingDecision {
|
||||||
|
chosen: Unknown,
|
||||||
|
missing_caps: vec![CapabilityTag::MultipleBreak],
|
||||||
|
notes: vec!["Multiple escape checks found"],
|
||||||
|
confidence: Low,
|
||||||
|
}
|
||||||
|
|
||||||
|
// Variable step (not constant)
|
||||||
|
RoutingDecision {
|
||||||
|
chosen: Unknown,
|
||||||
|
missing_caps: vec![CapabilityTag::VariableStep],
|
||||||
|
notes: vec!["Escape delta is not constant"],
|
||||||
|
confidence: Low,
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
## Parity Verification
|
||||||
|
|
||||||
|
### Dev-Only Observation
|
||||||
|
|
||||||
|
In `src/mir/builder/control_flow/joinir/routing.rs`:
|
||||||
|
|
||||||
|
1. **Router makes decision** using existing Pattern 1-4 logic
|
||||||
|
2. **Canonicalizer analyzes** and detects Pattern P5b
|
||||||
|
3. **Parity checker compares**:
|
||||||
|
- Router decision (Pattern 1-4)
|
||||||
|
- Canonicalizer decision (Pattern P5b)
|
||||||
|
4. **If mismatch**:
|
||||||
|
- Dev mode: Log with reason
|
||||||
|
- Strict mode: Fail-Fast with error
|
||||||
|
|
||||||
|
### Expected Outcomes
|
||||||
|
|
||||||
|
**Case A: Router picks Pattern 1, Canonicalizer picks P5b**
|
||||||
|
- Router: "Simple bounded loop"
|
||||||
|
- Canonicalizer: "Escape sequence pattern detected"
|
||||||
|
- **Resolution**: Canonicalizer is more specific → router will eventually delegate
|
||||||
|
|
||||||
|
**Case B: Router fails, Canonicalizer succeeds**
|
||||||
|
- Router: "No pattern matched" (Fail-Fast)
|
||||||
|
- Canonicalizer: "Pattern P5b matched"
|
||||||
|
- **Resolution**: P5b is new capability → expected until router updated
|
||||||
|
|
||||||
|
**Case C: Both agree P5b**
|
||||||
|
- Router: Pattern P5b
|
||||||
|
- Canonicalizer: Pattern P5b
|
||||||
|
- **Result**: ✅ Parity green
|
||||||
|
|
||||||
|
## Test Cases
|
||||||
|
|
||||||
|
### Minimal Case (test_pattern5b_escape_minimal.hako)
|
||||||
|
|
||||||
|
**Input**: String with one escape sequence
|
||||||
|
**Carrier**: Single position variable, single accumulator
|
||||||
|
**Deltas**: normal=1, escape=2
|
||||||
|
**Output**: Processed string (escape removed)
|
||||||
|
|
||||||
|
### Extended Cases (Phase 91 Step 2+)
|
||||||
|
|
||||||
|
1. **test_pattern5b_escape_json**: JSON string with multiple escapes
|
||||||
|
2. **test_pattern5b_escape_custom**: Custom escape character
|
||||||
|
3. **test_pattern5b_escape_newline**: Escape newline handling
|
||||||
|
4. **test_pattern5b_escape_fail_multiple**: Multiple escapes (should Fail-Fast)
|
||||||
|
5. **test_pattern5b_escape_fail_variable**: Variable delta (should Fail-Fast)
|
||||||
|
|
||||||
|
## Lowering Strategy (Future Phase 92)
|
||||||
|
|
||||||
|
### Philosophy: Keep Return Simple
|
||||||
|
|
||||||
|
Pattern P5b lowering should:
|
||||||
|
1. **Reuse Pattern 1-2 lowering** for normal case
|
||||||
|
2. **Extend for conditional increment**:
|
||||||
|
- PHI for carrier value after escape check
|
||||||
|
- Separate paths for escape vs normal
|
||||||
|
3. **Close within Pattern5b** (no cross-boundary complexity)
|
||||||
|
|
||||||
|
### Rough Outline
|
||||||
|
|
||||||
|
```
|
||||||
|
Entry: LoopPrefix
|
||||||
|
↓
|
||||||
|
Condition: i < n
|
||||||
|
↓
|
||||||
|
[BRANCH]
|
||||||
|
├→ EscapeBlock
|
||||||
|
│ ├→ i = i + escape_delta
|
||||||
|
│ └→ ch = substring(i)
|
||||||
|
│
|
||||||
|
└→ NormalBlock
|
||||||
|
├→ (ch already set)
|
||||||
|
└→ noop
|
||||||
|
|
||||||
|
(PHI: i from both branches)
|
||||||
|
↓
|
||||||
|
ProcessBlock: out = out + ch
|
||||||
|
↓
|
||||||
|
UpdateBlock: i = i + 1
|
||||||
|
↓
|
||||||
|
Condition check...
|
||||||
|
```
|
||||||
|
|
||||||
|
## Future Extensions
|
||||||
|
|
||||||
|
### Pattern P5c: Multi-Character Escapes
|
||||||
|
|
||||||
|
```
|
||||||
|
if ch == "\\" {
|
||||||
|
i = i + 2 // Skip \x
|
||||||
|
if i < n {
|
||||||
|
local second = s.substring(i, i+1)
|
||||||
|
// Handle \n, \t, \x, etc.
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Complexity**: Requires escape sequence table (not generic)
|
||||||
|
|
||||||
|
### Pattern P5d: Nested Escape Contexts
|
||||||
|
|
||||||
|
```
|
||||||
|
// Regex with escaped /, inside JSON string with escaped "
|
||||||
|
loop(i < n) {
|
||||||
|
if ch == "\"" { ... } // String boundary
|
||||||
|
if ch == "\\" {
|
||||||
|
if in_regex {
|
||||||
|
i = i + 2 // Regex escape
|
||||||
|
} else {
|
||||||
|
i = i + 1 // String escape
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Complexity**: State-dependent behavior (future work)
|
||||||
|
|
||||||
|
## References
|
||||||
|
|
||||||
|
- **JoinIR Architecture**: `joinir-architecture-overview.md`
|
||||||
|
- **Loop Canonicalizer**: `loop-canonicalizer.md`
|
||||||
|
- **CapabilityTag Enum**: `src/mir/loop_canonicalizer/capability_guard.rs`
|
||||||
|
- **Test Fixture**: `tools/selfhost/test_pattern5b_escape_minimal.hako`
|
||||||
|
- **Phase 91 Plan**: `phases/phase-91/README.md`
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Summary
|
||||||
|
|
||||||
|
**Pattern P5b** enables JoinIR recognition of escape-sequence-aware string parsing loops by:
|
||||||
|
|
||||||
|
1. **Extending Canonicalizer** to detect conditional increments
|
||||||
|
2. **Adding exit-line optimization** for escape branching
|
||||||
|
3. **Preserving ExitContract** consistency with P1-P4 patterns
|
||||||
|
4. **Enabling parity verification** in strict mode
|
||||||
|
|
||||||
|
**Status**: Design complete, implementation ready for Phase 91 Step 2
|
||||||
461
docs/development/current/main/phases/phase-91/README.md
Normal file
461
docs/development/current/main/phases/phase-91/README.md
Normal file
@ -0,0 +1,461 @@
|
|||||||
|
# Phase 91: JoinIR Coverage Expansion (Selfhost depth-2)
|
||||||
|
|
||||||
|
## Status
|
||||||
|
- 🔍 **Analysis Complete**: Loop inventory across selfhost codebase
|
||||||
|
- 📋 **Planning**: Pattern P5b (Escape Handling) candidate selected
|
||||||
|
- ⏳ **Implementation**: Deferred to dedicated session
|
||||||
|
|
||||||
|
## Executive Summary
|
||||||
|
|
||||||
|
**Current JoinIR Readiness**: 47% (16/30 loops in selfhost code)
|
||||||
|
|
||||||
|
| Category | Count | Status | Effort |
|
||||||
|
|----------|-------|--------|--------|
|
||||||
|
| Pattern 1 (simple bounded) | 16 | ✅ Ready | None |
|
||||||
|
| Pattern 2 (with break) | 1 | ⚠️ Partial | Low |
|
||||||
|
| Pattern P5b (escape handling) | ~3 | ❌ Blocked | Medium |
|
||||||
|
| Pattern P5 (guard-bounded) | ~2 | ❌ Blocked | High |
|
||||||
|
| Pattern P6 (nested loops) | ~8 | ❌ Blocked | Very High |
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Analysis Results
|
||||||
|
|
||||||
|
### Loop Inventory by Component
|
||||||
|
|
||||||
|
#### File: `apps/selfhost-vm/boxes/json_cur.hako` (3 loops)
|
||||||
|
- Lines 9-14: ✅ Pattern 1 (simple bounded)
|
||||||
|
- Lines 23-32: ✅ Pattern 1 variant with break
|
||||||
|
- Lines 42-57: ✅ Pattern 1 with guard-less loop(true)
|
||||||
|
|
||||||
|
#### File: `apps/selfhost-vm/json_loader.hako` (3 loops)
|
||||||
|
- Lines 16-22: ✅ Pattern 1 (simple bounded)
|
||||||
|
- **Lines 30-37**: ❌ Pattern P5b **CANDIDATE** (escape sequence handling)
|
||||||
|
- Lines 43-48: ✅ Pattern 1 (simple bounded)
|
||||||
|
|
||||||
|
#### File: `apps/selfhost-vm/boxes/mini_vm_core.hako` (9 loops)
|
||||||
|
- Lines 208-231: ⚠️ Pattern 1 variant (with continue)
|
||||||
|
- Lines 239-253: ✅ Pattern 1 (with accumulator)
|
||||||
|
- Lines 388-400, 493-505: ✅ Pattern 1 (6 bounded search loops)
|
||||||
|
- **Lines 541-745**: ❌ Pattern P5 **PRIME CANDIDATE** (guard-bounded, 204-line collect_prints)
|
||||||
|
|
||||||
|
#### File: `apps/selfhost-vm/boxes/seam_inspector.hako` (13 loops)
|
||||||
|
- Lines 10-26: ✅ Pattern 1
|
||||||
|
- Lines 38-42, 116-120, 123-127: ✅ Pattern 1 variants
|
||||||
|
- **Lines 76-107**: ❌ Pattern P6 (deeply nested, 7+ levels)
|
||||||
|
- Remaining: Mix of ⚠️ Pattern 1 variants with nested loops
|
||||||
|
|
||||||
|
#### File: `apps/selfhost-vm/boxes/mini_vm_prints.hako` (1 loop)
|
||||||
|
- Line 118+: ❌ Pattern P5 (guard-bounded multi-case)
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Candidate Selection: Priority Order
|
||||||
|
|
||||||
|
### 🥇 **IMMEDIATE CANDIDATE: Pattern P5b (Escape Handling)**
|
||||||
|
|
||||||
|
**Target**: `json_loader.hako:30` - `read_digits_from()`
|
||||||
|
|
||||||
|
**Scope**: 8-line loop
|
||||||
|
|
||||||
|
**Current Structure**:
|
||||||
|
```nyash
|
||||||
|
loop(i < n) {
|
||||||
|
local ch = s.substring(i, i+1)
|
||||||
|
if ch == "\"" { break }
|
||||||
|
if ch == "\\" {
|
||||||
|
i = i + 1
|
||||||
|
ch = s.substring(i, i+1)
|
||||||
|
}
|
||||||
|
out = out + ch
|
||||||
|
i = i + 1
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Pattern Classification**:
|
||||||
|
- **Header**: `loop(i < n)`
|
||||||
|
- **Escape Check**: `if ch == "\\" { i = i + 2 instead of i + 1 }`
|
||||||
|
- **Body**: Append character
|
||||||
|
- **Carriers**: `i` (position), `out` (buffer)
|
||||||
|
- **Challenge**: Variable increment (sometimes +1, sometimes +2)
|
||||||
|
|
||||||
|
**Why This Candidate**:
|
||||||
|
- ✅ **Small scope** (8 lines) - good for initial implementation
|
||||||
|
- ✅ **High reuse potential** - same pattern appears in multiple parser locations
|
||||||
|
- ✅ **Moderate complexity** - requires conditional step extension (not fully generic)
|
||||||
|
- ✅ **Clear benefit** - would unlock escape sequence handling across all string parsers
|
||||||
|
- ❌ **Scope limitation** - conditional increment not yet in Canonicalizer
|
||||||
|
|
||||||
|
**Effort Estimate**: 2-3 days
|
||||||
|
- Canonicalizer extension: 4-6 hours
|
||||||
|
- Pattern recognizer: 2-3 hours
|
||||||
|
- Lowering implementation: 4-6 hours
|
||||||
|
- Testing + verification: 2-3 hours
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### 🥈 **SECOND CANDIDATE: Pattern P5 (Guard-Bounded)**
|
||||||
|
|
||||||
|
**Target**: `mini_vm_core.hako:541` - `collect_prints()`
|
||||||
|
|
||||||
|
**Scope**: 204-line loop (monolithic)
|
||||||
|
|
||||||
|
**Current Structure**:
|
||||||
|
```nyash
|
||||||
|
loop(true) {
|
||||||
|
guard = guard + 1
|
||||||
|
if guard > 200 { break }
|
||||||
|
|
||||||
|
local p = index_of_from(json, k_print, pos)
|
||||||
|
if p < 0 { break }
|
||||||
|
|
||||||
|
// 5 different cases based on JSON type
|
||||||
|
if is_binary_op { ... pos = ... out.push(...) }
|
||||||
|
if is_compare { ... pos = ... out.push(...) }
|
||||||
|
if is_literal { ... pos = ... out.push(...) }
|
||||||
|
if is_function_call { ... pos = ... out.push(...) }
|
||||||
|
if is_nested { ... pos = ... out.push(...) }
|
||||||
|
|
||||||
|
pos = obj_end + 1
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Pattern Classification**:
|
||||||
|
- **Header**: `loop(true)` (unconditional)
|
||||||
|
- **Guard**: `guard > LIMIT` with increment each iteration
|
||||||
|
- **Body**: Multiple case-based mutations
|
||||||
|
- **Carriers**: `pos`, `printed`, `guard`, `out` (ArrayBox)
|
||||||
|
- **Exit conditions**: Guard exhaustion OR search failure
|
||||||
|
|
||||||
|
**Why This Candidate**:
|
||||||
|
- ✅ **Monolithic optimization opportunity** - 204 lines of complex control flow
|
||||||
|
- ✅ **Real-world JSON parsing** - demonstrates practical JoinIR application
|
||||||
|
- ✅ **High performance impact** - guard counter could be eliminated via SSA
|
||||||
|
- ❌ **High complexity** - needs new Pattern5 guard-handling variant
|
||||||
|
- ❌ **Large scope** - would benefit from split into micro-loops first
|
||||||
|
|
||||||
|
**Effort Estimate**: 1-2 weeks
|
||||||
|
- Design: 2-3 days (pattern definition, contract)
|
||||||
|
- Implementation: 5-7 days
|
||||||
|
- Testing + verification: 2-3 days
|
||||||
|
|
||||||
|
**Alternative Strategy**: Could split into 5 micro-loops per case:
|
||||||
|
```nyash
|
||||||
|
// Instead of one 204-line loop with 5 cases:
|
||||||
|
// Create 5 functions, each handling one case:
|
||||||
|
loop_binary_op() { ... }
|
||||||
|
loop_compare() { ... }
|
||||||
|
loop_literal() { ... }
|
||||||
|
loop_function_call() { ... }
|
||||||
|
loop_nested() { ... }
|
||||||
|
|
||||||
|
// Then main loop dispatches:
|
||||||
|
loop(true) {
|
||||||
|
guard = guard + 1
|
||||||
|
if guard > limit { break }
|
||||||
|
if type == BINARY_OP { loop_binary_op(...) }
|
||||||
|
...
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
This would make each sub-loop Pattern 1-compatible immediately.
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### 🥉 **THIRD CANDIDATE: Pattern P6 (Nested Loops)**
|
||||||
|
|
||||||
|
**Target**: `seam_inspector.hako:76` - `_scan_boxes()`
|
||||||
|
|
||||||
|
**Scope**: Multi-level nested (7+ nesting levels)
|
||||||
|
|
||||||
|
**Current Structure**: 37-line outer loop containing 6 nested loops
|
||||||
|
|
||||||
|
**Pattern Classification**:
|
||||||
|
- **Nesting levels**: 7+
|
||||||
|
- **Carriers**: Multiple per level (`i`, `j`, `k`, `name`, `pos`, etc.)
|
||||||
|
- **Exit conditions**: Varied per level (bounds, break, continue)
|
||||||
|
- **Scope handoff**: Complex state passing between levels
|
||||||
|
|
||||||
|
**Why This Candidate**:
|
||||||
|
- ✅ **Demonstrates nested composition** - needed for production parsers
|
||||||
|
- ✅ **Realistic code** - actual box/function scanner
|
||||||
|
- ❌ **Highest complexity** - requires recursive JoinIR composition
|
||||||
|
- ❌ **Long-term project** - 2-3 weeks minimum
|
||||||
|
|
||||||
|
**Effort Estimate**: 2-3 weeks
|
||||||
|
- Design recursive composition: 3-5 days
|
||||||
|
- Per-level implementation: 7-10 days
|
||||||
|
- Testing nested composition: 3-5 days
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Recommended Immediate Action
|
||||||
|
|
||||||
|
### Phase 91 (This Session): Pattern P5b Planning
|
||||||
|
|
||||||
|
**Objective**: Design Pattern P5b (escape sequence handling) with minimal implementation
|
||||||
|
|
||||||
|
**Steps**:
|
||||||
|
1. ✅ **Analysis complete** (done by Explore agent)
|
||||||
|
2. **Design P5b pattern** (canonicalizer contract)
|
||||||
|
3. **Create minimal fixture** (`test_pattern5b_escape_minimal.hako`)
|
||||||
|
4. **Extend Canonicalizer** to recognize escape patterns
|
||||||
|
5. **Plan lowering** (defer implementation to next session)
|
||||||
|
6. **Document P5b architecture** in loop-canonicalizer.md
|
||||||
|
|
||||||
|
**Acceptance Criteria**:
|
||||||
|
- ✅ Pattern P5b design document complete
|
||||||
|
- ✅ Minimal escape test fixture created
|
||||||
|
- ✅ Canonicalizer recognizes escape patterns (dev-only observation)
|
||||||
|
- ✅ Parity check passes (strict mode)
|
||||||
|
- ✅ No lowering changes yet (recognition-only phase)
|
||||||
|
|
||||||
|
**Deliverables**:
|
||||||
|
- `docs/development/current/main/phases/phase-91/README.md` - This document
|
||||||
|
- `docs/development/current/main/design/pattern-p5b-escape-design.md` - Pattern design (new)
|
||||||
|
- `tools/selfhost/test_pattern5b_escape_minimal.hako` - Test fixture (new)
|
||||||
|
- Updated `docs/development/current/main/design/loop-canonicalizer.md` - Capability tags extended
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Design: Pattern P5b (Escape Sequence Handling)
|
||||||
|
|
||||||
|
### Motivation
|
||||||
|
|
||||||
|
String parsing commonly requires escape sequence handling:
|
||||||
|
- Double quotes: `"text with \" escaped quote"`
|
||||||
|
- Backslashes: `"path\\with\\backslashes"`
|
||||||
|
- Newlines: `"text with \n newline"`
|
||||||
|
|
||||||
|
Current loops handle this with conditional increment:
|
||||||
|
```rust
|
||||||
|
if ch == "\\" {
|
||||||
|
i = i + 1 // Skip escape character itself
|
||||||
|
ch = next_char
|
||||||
|
}
|
||||||
|
i = i + 1 // Always advance
|
||||||
|
```
|
||||||
|
|
||||||
|
This variable-step pattern is **not JoinIR-compatible** because:
|
||||||
|
- Loop increment is conditional (sometimes +1, sometimes +2)
|
||||||
|
- Canonicalizer expects constant-delta carriers
|
||||||
|
- Lowering expects uniform update rules
|
||||||
|
|
||||||
|
### Solution: Pattern P5b Definition
|
||||||
|
|
||||||
|
#### Header Requirement
|
||||||
|
```
|
||||||
|
loop(i < n) // Bounded loop on string length
|
||||||
|
```
|
||||||
|
|
||||||
|
#### Escape Check Requirement
|
||||||
|
```
|
||||||
|
if ch == "\\" {
|
||||||
|
i = i + delta_skip // Skip character (typically +1, +2, or variable)
|
||||||
|
// Optional: consume escape character
|
||||||
|
ch = s.substring(i, i+1)
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
#### After-Escape Requirement
|
||||||
|
```
|
||||||
|
// Standard character processing
|
||||||
|
out = out + ch
|
||||||
|
i = i + delta_normal // Standard increment (typically +1)
|
||||||
|
```
|
||||||
|
|
||||||
|
#### Skeleton Structure
|
||||||
|
```
|
||||||
|
LoopSkeleton {
|
||||||
|
steps: [
|
||||||
|
HeaderCond(i < n),
|
||||||
|
Body(escape_check_stmts),
|
||||||
|
Body(process_char_stmts),
|
||||||
|
Update(i = i + normal_delta, maybe(i = i + skip_delta))
|
||||||
|
]
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
#### Carrier Configuration
|
||||||
|
- **Primary Carrier**: Loop variable (`i`)
|
||||||
|
- `delta_normal`: +1 (standard case)
|
||||||
|
- `delta_escape`: +1 or +2 (skip escape)
|
||||||
|
- **Secondary Carrier**: Accumulator (`out`)
|
||||||
|
- Pattern: `out = out + value`
|
||||||
|
|
||||||
|
#### ExitContract
|
||||||
|
```
|
||||||
|
ExitContract {
|
||||||
|
has_break: true, // Break on quote detection
|
||||||
|
has_continue: false,
|
||||||
|
has_return: false,
|
||||||
|
carriers: vec![
|
||||||
|
CarrierInfo { name: "i", deltas: [+1, +2] },
|
||||||
|
CarrierInfo { name: "out", pattern: Append }
|
||||||
|
]
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
#### Routing Decision
|
||||||
|
```
|
||||||
|
RoutingDecision {
|
||||||
|
chosen: Pattern5bEscape,
|
||||||
|
structure_notes: ["escape_handling", "variable_step"],
|
||||||
|
missing_caps: [] // All required capabilities present
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
### Recognition Algorithm
|
||||||
|
|
||||||
|
#### AST Inspection Steps
|
||||||
|
|
||||||
|
1. **Find escape check**:
|
||||||
|
- Pattern: `if ch == "\\" { ... }`
|
||||||
|
- Extract: Escape character constant
|
||||||
|
- Extract: Increment inside if block
|
||||||
|
|
||||||
|
2. **Extract skip delta**:
|
||||||
|
- Pattern: `i = i + <const>`
|
||||||
|
- Calculate: `skip_delta = <const>`
|
||||||
|
|
||||||
|
3. **Find normal increment**:
|
||||||
|
- Pattern: `i = i + <const>` (after escape if block)
|
||||||
|
- Calculate: `normal_delta = <const>`
|
||||||
|
|
||||||
|
4. **Validate break condition**:
|
||||||
|
- Pattern: `if <char> == "<quote>" { break }`
|
||||||
|
- Required for string boundary detection
|
||||||
|
|
||||||
|
5. **Build LoopSkeleton**:
|
||||||
|
- Carriers: `[{name: "i", deltas: [normal, skip]}, ...]`
|
||||||
|
- ExitContract: `has_break=true`
|
||||||
|
- RoutingDecision: `chosen=Pattern5bEscape`
|
||||||
|
|
||||||
|
### Implementation Plan
|
||||||
|
|
||||||
|
#### Canonicalizer Extension (`src/mir/loop_canonicalizer/canonicalizer.rs`)
|
||||||
|
|
||||||
|
Add `detect_escape_pattern()` recognition:
|
||||||
|
```rust
|
||||||
|
fn detect_escape_pattern(
|
||||||
|
loop_expr: &Expr,
|
||||||
|
carriers: &[String]
|
||||||
|
) -> Option<EscapePatternInfo> {
|
||||||
|
// Step 1-5 as above
|
||||||
|
// Return: { escape_char, skip_delta, normal_delta, carrier_name }
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
Priority: Call before `detect_skip_whitespace_pattern()` (more specific pattern first)
|
||||||
|
|
||||||
|
#### Pattern Recognizer Wrapper (`src/mir/loop_canonicalizer/pattern_recognizer.rs`)
|
||||||
|
|
||||||
|
Expose `detect_escape_pattern()`:
|
||||||
|
```rust
|
||||||
|
pub fn try_extract_escape_pattern(
|
||||||
|
loop_expr: &Expr
|
||||||
|
) -> Option<(String, i64, i64)> { // (carrier, normal_delta, skip_delta)
|
||||||
|
// Delegate to canonicalizer detection
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
#### Test Fixture (`tools/selfhost/test_pattern5b_escape_minimal.hako`)
|
||||||
|
|
||||||
|
Minimal reproducible example:
|
||||||
|
```nyash
|
||||||
|
// Minimal escape sequence parser
|
||||||
|
local s = "\\"hello\\" world"
|
||||||
|
local n = s.length()
|
||||||
|
local i = 0
|
||||||
|
local out = ""
|
||||||
|
|
||||||
|
loop(i < n) {
|
||||||
|
local ch = s.substring(i, i+1)
|
||||||
|
|
||||||
|
if ch == "\"" {
|
||||||
|
break
|
||||||
|
}
|
||||||
|
|
||||||
|
if ch == "\\" {
|
||||||
|
i = i + 1 // Skip escape character
|
||||||
|
if i < n {
|
||||||
|
ch = s.substring(i, i+1)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
out = out + ch
|
||||||
|
i = i + 1
|
||||||
|
}
|
||||||
|
|
||||||
|
print(out) // Should print: hello" world
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Files to Modify (Phase 91)
|
||||||
|
|
||||||
|
### New Files
|
||||||
|
1. `docs/development/current/main/phases/phase-91/README.md` ← You are here
|
||||||
|
2. `docs/development/current/main/design/pattern-p5b-escape-design.md` (new - detailed design)
|
||||||
|
3. `tools/selfhost/test_pattern5b_escape_minimal.hako` (new - test fixture)
|
||||||
|
|
||||||
|
### Modified Files
|
||||||
|
1. `docs/development/current/main/design/loop-canonicalizer.md`
|
||||||
|
- Add Pattern P5b to capability matrix
|
||||||
|
- Add recognition algorithm
|
||||||
|
- Add routing decision table
|
||||||
|
|
||||||
|
2. (Phase 91 Step 2+) `src/mir/loop_canonicalizer/canonicalizer.rs`
|
||||||
|
- Add `detect_escape_pattern()` function
|
||||||
|
- Extend `canonicalize_loop_expr()` to check for escape patterns
|
||||||
|
|
||||||
|
3. (Phase 91 Step 2+) `src/mir/loop_canonicalizer/pattern_recognizer.rs`
|
||||||
|
- Add `try_extract_escape_pattern()` wrapper
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Next Steps (Future Sessions)
|
||||||
|
|
||||||
|
### Phase 91 Step 2: Implementation
|
||||||
|
- Implement `detect_escape_pattern()` in Canonicalizer
|
||||||
|
- Add unit tests for escape pattern recognition
|
||||||
|
- Verify strict parity with router
|
||||||
|
|
||||||
|
### Phase 92: Lowering
|
||||||
|
- Implement Pattern5bEscape lowerer
|
||||||
|
- Handle variable-step carrier updates
|
||||||
|
- E2E test with `test_pattern5b_escape_minimal.hako`
|
||||||
|
|
||||||
|
### Phase 93: Pattern P5 (Guard-Bounded)
|
||||||
|
- Implement Pattern5 for `mini_vm_core.hako:541`
|
||||||
|
- Consider micro-loop refactoring alternative
|
||||||
|
- Document guard-counter optimization strategy
|
||||||
|
|
||||||
|
### Phase 94+: Pattern P6 (Nested Loops)
|
||||||
|
- Recursive JoinIR composition for `seam_inspector.hako:76`
|
||||||
|
- Cross-level scope/carrier handoff
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## SSOT References
|
||||||
|
|
||||||
|
- **JoinIR Architecture**: `docs/development/current/main/joinir-architecture-overview.md`
|
||||||
|
- **Loop Canonicalizer Design**: `docs/development/current/main/design/loop-canonicalizer.md`
|
||||||
|
- **Capability Tags**: `src/mir/loop_canonicalizer/capability_guard.rs`
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Summary
|
||||||
|
|
||||||
|
**Phase 91** establishes the next frontier of JoinIR coverage: **Pattern P5b (Escape Handling)**.
|
||||||
|
|
||||||
|
This pattern unlocks:
|
||||||
|
- ✅ All string escape parsing loops
|
||||||
|
- ✅ Foundation for Pattern P5 (guard-bounded)
|
||||||
|
- ✅ Preparation for Pattern P6 (nested loops)
|
||||||
|
|
||||||
|
**Current readiness**: 47% (16/30 loops)
|
||||||
|
**After Phase 91**: Expected to reach ~60% (18/30 loops)
|
||||||
|
**Long-term target**: >90% coverage with P5, P5b, P6 patterns
|
||||||
|
|
||||||
|
All acceptance criteria defined. Implementation ready for next session.
|
||||||
59
tools/selfhost/test_pattern5b_escape_minimal.hako
Normal file
59
tools/selfhost/test_pattern5b_escape_minimal.hako
Normal file
@ -0,0 +1,59 @@
|
|||||||
|
// Minimal Pattern P5b (Escape Handling) Test Fixture
|
||||||
|
// Purpose: Verify JoinIR Canonicalizer recognition of escape sequence patterns
|
||||||
|
//
|
||||||
|
// Pattern: loop(i < n) with conditional increment on escape character
|
||||||
|
// Carriers: i (position), out (accumulator)
|
||||||
|
// Exit: break on quote character
|
||||||
|
//
|
||||||
|
// This pattern is common in string parsing:
|
||||||
|
// - JSON string readers
|
||||||
|
// - CSV parsers
|
||||||
|
// - Template engines
|
||||||
|
// - Escape sequence handlers
|
||||||
|
|
||||||
|
static box Main {
|
||||||
|
console: ConsoleBox
|
||||||
|
|
||||||
|
main() {
|
||||||
|
me.console = new ConsoleBox()
|
||||||
|
|
||||||
|
// Test data: string with escape sequence
|
||||||
|
// Original: "hello\" world"
|
||||||
|
// After parsing: hello" world
|
||||||
|
local s = "hello\\\" world"
|
||||||
|
local n = s.length()
|
||||||
|
local i = 0
|
||||||
|
local out = ""
|
||||||
|
|
||||||
|
// Pattern P5b: Escape sequence handling loop
|
||||||
|
// - Header: loop(i < n)
|
||||||
|
// - Escape check: if ch == "\\" { i = i + 1 }
|
||||||
|
// - Process: out = out + ch
|
||||||
|
// - Update: i = i + 1
|
||||||
|
loop(i < n) {
|
||||||
|
local ch = s.substring(i, i + 1)
|
||||||
|
|
||||||
|
// Break on quote (string boundary)
|
||||||
|
if ch == "\"" {
|
||||||
|
break
|
||||||
|
}
|
||||||
|
|
||||||
|
// Handle escape sequence: skip the escape char itself
|
||||||
|
if ch == "\\" {
|
||||||
|
i = i + 1 // Skip escape character (i increments by +2 total with final i++)
|
||||||
|
if i < n {
|
||||||
|
ch = s.substring(i, i + 1)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Accumulate processed character
|
||||||
|
out = out + ch
|
||||||
|
i = i + 1 // Standard increment
|
||||||
|
}
|
||||||
|
|
||||||
|
// Expected output: hello" world (escape removed)
|
||||||
|
me.console.log(out)
|
||||||
|
|
||||||
|
return "OK"
|
||||||
|
}
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user