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## Phase 132: Exit PHI Value Parity Fix ### Problem Pattern 1 (Simple While) returned 0 instead of final loop variable value (3) - VM: RC: 3 ✅ (correct) - LLVM: Result: 0 ❌ (wrong) ### Root Cause (Two Layers) 1. **JoinIR/Boundary**: Missing exit_bindings → ExitLineReconnector not firing 2. **LLVM Python**: block_end_values snapshot dropping PHI values ### Fix **JoinIR** (simple_while_minimal.rs): - Jump(k_exit, [i_param]) passes exit value **Boundary** (pattern1_minimal.rs): - Added LoopExitBinding with carrier_name="i", role=LoopState - Enables ExitLineReconnector to update variable_map **LLVM** (block_lower.py): - Use predeclared_ret_phis for reliable PHI filtering - Protect builder.vmap PHIs from overwrites (SSOT principle) ### Result - ✅ VM: RC: 3 - ✅ LLVM: Result: 3 - ✅ VM/LLVM parity achieved ## Phase 132-Post: Box-First Refactoring ### Rust Side **JoinModule::require_function()** (mod.rs): - Encapsulate function search logic - 10 lines → 1 line (90% reduction) - Reusable for Pattern 2-5 ### Python Side **PhiManager Box** (phi_manager.py - new): - Centralized PHI lifecycle management - 47 lines → 8 lines (83% reduction) - SSOT: builder.vmap owns PHIs - Fail-Fast: No silent overwrites **Integration**: - LLVMBuilder: Added phi_manager - block_lower.py: Delegated to PhiManager - tagging.py: Register PHIs with manager ### Documentation **New Files**: - docs/development/architecture/exit-phi-design.md - docs/development/current/main/investigations/phase132-llvm-exit-phi-wrong-result.md - docs/development/current/main/phases/phase-132/ **Updated**: - docs/development/current/main/10-Now.md - docs/development/current/main/phase131-3-llvm-lowering-inventory.md ### Design Principles - Box-First: Logic encapsulated in classes/methods - SSOT: Single Source of Truth (builder.vmap for PHIs) - Fail-Fast: Early explicit failures, no fallbacks - Separation of Concerns: 3-layer architecture 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Nyash Development Documentation 🔧
開発者向けの進行中タスクと開発計画ドキュメントです。
📂 ディレクトリ構造
current/
CURRENT_TASK.md- 現在進行中のタスク- アクティブな開発作業の詳細
- 最新の実装状況
roadmap/
- phases/ - フェーズ別開発計画
- phase-8/ - AST→MIR変換
- phase-9/ - VM/JIT実装
- phase-10/ - AOT最適化
- native-plan/ - ネイティブビルド計画
- 実行バックエンド統合
- パフォーマンス目標
proposals/
- RFC（Request for Comments）
- 新機能提案
- 設計ディスカッション
🎯 重要な参照先
- 進行状況:
current/CURRENT_TASK.md - 開発計画:
roadmap/phases/ - 技術提案:
proposals/ - ドキュメントのステータス/入口ポリシー:
doc-status-policy.md - JoinIR / Selfhost の入口:
current/main/01-JoinIR-Selfhost-INDEX.md
📝 注意事項
このディレクトリの内容は開発中であり、頻繁に変更されます。
安定した仕様はreference/を参照してください。