feat(llvm): Phase 132 - Pattern 1 exit value parity fix + Box-First refactoring
## 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>
This commit is contained in:
nyash-codex
@ -4,7 +4,7 @@
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詳細は `docs/development/current/main/` 以下の各 Phase 文書と、JoinIR の SSOT である
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`docs/development/current/main/joinir-architecture-overview.md` を参照してね。
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最終更新: 2025-12-14
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最終更新: 2025-12-15
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過去ログ（肥大化した旧 CURRENT_TASK）はここに退避したよ:
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- `docs/development/current/main/CURRENT_TASK_ARCHIVE_2025-12-13.md`
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@ -18,7 +18,10 @@
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- debug flag SSOT / DebugOutputBox 移行 / error tags 集約 / carrier init builder まで整備済み。
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- **LLVM exe line SSOT 確立**: `tools/build_llvm.sh` を使用した .hako → executable パイプライン標準化完了。
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- **LLVM AOT（Python llvmlite）ループ復旧**: `apps/tests/loop_min_while.hako` が EMIT/LINK/RUN まで到達（Phase 131-3..10）。
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- 残り: `loop(true)` + `break/continue` の JoinIR パターン穴（Case C）
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- Case C（`loop(true)` + break/continue）は Phase 131-11 で Pattern/shape guard の基盤まで到達。残りは Case C の parity/仕上げ（SSOT を見ながら詰める）。
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- **Phase 132 完了**: Pattern 1（Simple While）の `return i` が VM/LLVM で一致（3 を返す）まで根治。
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- JoinIR/Boundary: exit 値を境界に明示的に渡す
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- LLVM Python: PHI を落とす/上書きする経路を除去（PHI SSOT を保護）
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- **Phase 88 完了**: continue + 可変ステップ（i=i+const 差分）を dev-only fixture で固定、StepCalculator Box 抽出。
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- **Phase 89 完了**: P0（ContinueReturn detector）+ P1（lowering 実装）完了。
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- **Phase 90 完了**: ParseStringComposite + `Null` literal + ContinueReturn（同一値の複数 return-if）を dev-only fixture で固定。
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@ -35,6 +38,8 @@
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- `docs/development/current/main/phase131-2-box-resolution-map.md`
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- `docs/development/current/main/phase131-3-llvm-lowering-inventory.md`
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- `docs/development/current/main/phase131-5-taglink-fix-summary.md`
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- `docs/development/current/main/phases/phase-132/README.md`
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- `docs/development/current/main/investigations/phase132-llvm-exit-phi-wrong-result.md`
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---
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215
docs/development/architecture/exit-phi-design.md
Normal file
215
docs/development/architecture/exit-phi-design.md
Normal file
@ -0,0 +1,215 @@
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# Exit PHI Design - Phase 132 Architecture
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## Overview
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Phase 132 で完成した Exit PHI アーキテクチャの責務分離設計。
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## Three-Layer Responsibility Model
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### Layer 1: JoinIR (Frontend - データ生成層)
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**責務**: ループ脱出時の変数バインディング情報を生成
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**実装箇所**: `src/mir/join_ir/lowering/inline_boundary/`
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**主要コンポーネント**:
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- `LoopExitBinding`: ループ脱出時の変数バインディング構造
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```rust
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pub struct LoopExitBinding {
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pub carrier_name: String, // 変数名 (e.g., "i")
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pub join_exit_value: ValueId, // JoinIR k_exit 関数の引数
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pub host_slot: ValueId, // Host MIR の PHI dst
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}
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```
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**データフロー**:
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```
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Pattern 1 Minimal:
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loop_step → Jump(k_exit, [i_param]) → exit_bindings = [LoopExitBinding { "i", i_param, host_slot }]
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```
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**Phase 132 貢献**:
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- `exit_bindings` フィールド追加（`JoinInlineBoundary` 構造体）
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- Pattern 1-5 各パターンで exit binding 生成ロジック実装
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---
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### Layer 2: Boundary (Middleware - 接続実行層)
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**責務**: JoinIR の exit_bindings を使って Host MIR に Exit PHI を接続
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**実装箇所**: `src/mir/builder/control_flow/joinir/merge/`
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**主要コンポーネント**:
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- `ExitLineReconnector`: Exit PHI 接続 Box (Phase 33-10 で箱化)
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```rust
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impl ExitLineReconnector {
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fn connect_exit_line(
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&self,
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boundary: &JoinInlineBoundary,
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exit_block_id: BasicBlockId,
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exit_predecessor: BasicBlockId,
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builder: &mut Builder,
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) -> Result<(), String>
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}
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```
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**処理フロー**:
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1. `exit_bindings` をイテレート
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2. 各 binding について:
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- `host_slot` (PHI dst) に対して
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- `(exit_predecessor, join_exit_value)` を incoming として追加
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**Phase 132 貢献**:
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- `exit_bindings` を読み取る発火ロジック実装
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- Phase 131 の metadata 参照ロジックを完全削除（SSOT化）
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---
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### Layer 3: LLVM Backend (Execution - PHI保護層)
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**責務**: builder.vmap 内の PHI を SSOT として保護・管理
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**実装箇所**: `src/llvm_py/`
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**主要コンポーネント** (Phase 132-Post):
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- `PhiManager` Box: PHI ライフサイクル管理
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```python
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class PhiManager:
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def register_phi(bid: int, vid: int, phi_value)
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def is_phi_owned(bid: int, vid: int) -> bool
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def filter_vmap_preserve_phis(vmap: dict, target_bid: int) -> dict
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def sync_protect_phis(target_vmap: dict, source_vmap: dict)
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```
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**SSOT Principle**:
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- `builder.vmap` の PHI は **Single Source of Truth**
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- PHI は絶対に上書きしない
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- ブロック間で PHI 所有権を明確に管理
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**Phase 132 貢献**:
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- `predeclared_ret_phis` dict による PHI ownership tracking
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- vmap filtering: ブロック外の PHI を除外
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- sync protection: 既存 PHI を上書きしない
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**Phase 132-Post 貢献** (Box-First Refactoring):
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- `PhiManager` Box 化で PHI 管理ロジック集約
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- `filter_vmap_preserve_phis()`: PHI フィルタリングをカプセル化
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- `sync_protect_phis()`: PHI 保護ロジックをカプセル化
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---
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## Data Flow Example (Pattern 1 Minimal)
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```
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【JoinIR Layer】
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loop_step 関数:
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Jump(k_exit, [i_param], cond=exit_cond)
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↓
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Pattern 1 lowering:
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exit_bindings = [
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LoopExitBinding {
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carrier_name: "i",
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join_exit_value: ValueId(1003), // JoinIR i_param
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host_slot: ValueId(3), // Host MIR PHI dst
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}
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]
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【Boundary Layer】
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ExitLineReconnector::connect_exit_line():
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for binding in exit_bindings:
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builder.add_phi_incoming(
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block: exit_block_id,
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dst: ValueId(3), // host_slot
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incoming: (bb6, ValueId(3)) // (exit_pred, remapped join_exit_value)
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)
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↓
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Host MIR:
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bb3: ValueId(3) = phi [(bb6, ValueId(3))]
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【LLVM Layer】
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PhiManager::register_phi(3, 3, phi_value) // PHI を登録
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↓
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block_lower.py Pass A (非終端命令処理):
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vmap_cur = PhiManager.filter_vmap_preserve_phis(builder.vmap, 3)
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# → bb3 所有の PHI(3) のみ保持、他ブロックの PHI は除外
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↓
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Pass A sync:
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PhiManager.sync_protect_phis(builder.vmap, vmap_cur)
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# → builder.vmap の PHI を上書きしない
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↓
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Pass B (PHI finalization):
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phi_3.add_incoming(val_3, bb6)
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↓
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Pass C (終端命令処理):
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ret phi_3
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```
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---
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## Design Principles
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### 1. **Separation of Concerns**
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- **JoinIR**: データ生成のみ（実行なし）
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- **Boundary**: 接続実行のみ（データ保護なし）
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- **LLVM**: PHI保護・管理のみ（生成なし）
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### 2. **Box-First Architecture** (Phase 132-Post)
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- ロジックを Box (クラス/メソッド) にカプセル化
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- `ExitLineReconnector` Box (Boundary)
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- `PhiManager` Box (LLVM)
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### 3. **SSOT (Single Source of Truth)**
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- `exit_bindings` が変数バインディングの唯一の真実
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- `builder.vmap` の PHI が SSA 値の唯一の真実
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- metadata 参照の完全排除
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### 4. **Fail-Fast**
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- エラーは早期に明示的に失敗
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- フォールバック処理は禁止
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- PHI 上書きは panic
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---
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## Migration from Phase 131
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### Phase 131 (Before)
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- ❌ Jump metadata (`jump_args`) から exit PHI を復元
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- ❌ Block.metadata 参照の散在
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- ❌ PHI 管理ロジックの分散
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### Phase 132 (After)
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- ✅ `exit_bindings` で明示的データフロー
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- ✅ Boundary 層での一元的 PHI 接続
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- ✅ metadata 完全削除（Block からも削除）
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### Phase 132-Post (Box-First Refactoring)
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- ✅ `PhiManager` Box による PHI 管理ロジック集約
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- ✅ `filter_vmap_preserve_phis()` でフィルタリング簡潔化
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- ✅ `sync_protect_phis()` で保護ロジック再利用可能
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---
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## Future Work
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### Pattern 2-5 への拡張
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- Pattern 2 (If-in-Loop): 複数変数 exit bindings
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- Pattern 3 (Loop-with-If): exit line 分岐処理
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- Pattern 4-5: 複雑な exit 条件
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### PhiManager 拡張候補
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- PHI タイプヒント管理
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- PHI incoming 検証
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- PHI 最適化ヒント
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---
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## References
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- Phase 132 実装ログ: `docs/development/current/main/phases/phase-132/`
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- Boundary アーキテクチャ: `docs/development/architecture/phase-33-modularization.md`
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- JoinIR 全体設計: `docs/development/current/main/joinir-architecture-overview.md`
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---
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Last Updated: 2025-12-15 (Phase 132-Post Box-First Refactoring)
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@ -1,5 +1,14 @@
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# Self Current Task — Now (main)
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## 2025‑12‑15：Phase 132 完了 ✅
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**Phase 132: LLVM Exit PHI=0 根治修正 完了！**
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- ループ exit PHI が 0 を返す問題を根治解決
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- 原因（2層）: (1) JoinIR/Boundary が exit 値を境界に渡していない、(2) LLVM Python が PHI を落とす/上書きする
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- 修正: Pattern 1 で exit 値を明示的に渡す + `predeclared_ret_phis` 使用 + `builder.vmap` の PHI 保護
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- 結果: `/tmp/p1_return_i.hako` が 3 を返す（VM 一致）
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- 詳細: `investigations/phase132-llvm-exit-phi-wrong-result.md`
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## 2025‑12‑14：現状サマリ
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（補足）docs が増えて迷子になったときの「置き場所ルール（SSOT）」:
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@ -79,7 +88,8 @@
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- `docs/development/current/main/phase131-2-box-resolution-map.md`
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- LLVM（Python llvmlite）lowering の棚卸し（Phase 131-3..10）:
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- `docs/development/current/main/phase131-3-llvm-lowering-inventory.md`
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- 状態: Case B（Pattern1/loop_min_while）は EMIT/LINK/RUN まで復旧済み。残りは Case C の JoinIR ループパターン穴。
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- 状態: Case B（Pattern1/loop_min_while）は EMIT/LINK/RUN まで復旧済み。Phase 132 で `return i` の VM/LLVM parity を固定。
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- Case C は別途 “Case C docs” を SSOT にして追跡する（状況は更新されるので、この箇所では断定しない）
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- Case C の調査と実装計画:
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- `docs/development/current/main/phase131-11-case-c-summary.md`
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- `docs/development/current/main/case-c-infinite-loop-analysis.md`
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@ -0,0 +1,216 @@
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# Phase 132: LLVM Exit PHI=0 Bug Investigation & Fix
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**Date**: 2025-12-15
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**Status**: ✅ Fixed
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**Impact**: Critical - Exit PHIs from loops were returning 0 instead of correct values
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## Problem Statement
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LLVM backend was returning 0 for exit PHI values in simple while loops, while VM backend correctly returned the final loop variable value.
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### Test Case
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```nyash
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static box Main {
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main() {
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local i = 0
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loop(i < 3) { i = i + 1 }
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return i // Should return 3, was returning 0 in LLVM
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}
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}
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```
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**Expected**: Result: 3 (matches VM)
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**Actual (before fix)**: Result: 0
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**MIR**: Correct (`bb3: %1 = phi [%3, bb6]; ret %1`)
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**LLVM IR (before fix)**: `ret i64 0` (wrong!)
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**LLVM IR (after fix)**: `ret i64 %"phi_1"` (correct!)
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## Root Cause Analysis
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この不具合は「2層」にまたがっていました:
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1. JoinIR/Boundary 層で exit 値が境界を通っていない（VM でも 0 になり得る）
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2. LLVM Python 層で PHI の SSOT が壊れていて exit PHI が 0 になる（VM は正常でも LLVM が壊れる）
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このページは主に (2) の LLVM Python 層の根治を記録します。
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(1) の修正は Phase 132 の一部として別途コード側で入っています（修正ファイル一覧を参照）。
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### Investigation Path
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1. **PHI filtering issue in vmap_cur initialization**
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- ✅ Confirmed: Filter relied on `phi.basic_block` attribute
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- Issue: llvmlite sets `phi.basic_block = None` until IR finalization
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- Filter at block_lower.py:323-365 was silently dropping ALL PHIs
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2. **builder.vmap overwrite issue**
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- ✅ Confirmed: The real root cause!
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### The Actual Bug
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**Two separate issues** combined to cause the bug:
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#### Issue 1: Unreliable PHI.basic_block Attribute
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- llvmlite's PHI instructions have `basic_block = None` when created
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- Filter logic at block_lower.py:326-340 relied on `phi.basic_block.name` comparison
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- Since `basic_block` was always None, filter excluded ALL PHIs from vmap_cur
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- **Fix**: Use `predeclared_ret_phis` dict instead of `basic_block` attribute
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|
||||
#### Issue 2: builder.vmap PHI Overwrites (Critical!)
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||||
At block_lower.py:437-448, Pass A syncs created values to builder.vmap:
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|
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```python
|
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# Phase 131-7: Sync ALL created values to global vmap
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for vid in created_ids:
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val = vmap_cur.get(vid)
|
||||
if val is not None:
|
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builder.vmap[vid] = val # ❌ Unconditional overwrite!
|
||||
```
|
||||
|
||||
**The Fatal Sequence**:
|
||||
1. Pass A setup: Creates PHI v1 for bb3, stores in `builder.vmap[1]`
|
||||
2. Pass A processes bb0:
|
||||
- vmap_cur filters out v1 PHI (not from bb0)
|
||||
- const v1 instruction writes to vmap_cur[1]
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||||
- **Line 444: Syncs vmap_cur[1] → builder.vmap[1], overwriting PHI!**
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||||
3. Pass A processes bb3:
|
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- vmap_cur initialized from builder.vmap
|
||||
- builder.vmap[1] is now the const (not PHI!)
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||||
- return v1 uses const 0 instead of PHI
|
||||
|
||||
## The Fix
|
||||
|
||||
### Fix 1: PHI Filtering (block_lower.py:320-347)
|
||||
|
||||
**Before** (unreliable basic_block check):
|
||||
```python
|
||||
if hasattr(_val, 'add_incoming'):
|
||||
bb_of = getattr(getattr(_val, 'basic_block', None), 'name', None)
|
||||
bb_name = getattr(bb, 'name', None)
|
||||
keep = (bb_of == bb_name) # ❌ Always False! bb_of is None
|
||||
```
|
||||
|
||||
**After** (use predeclared_ret_phis dict):
|
||||
```python
|
||||
if hasattr(_val, 'add_incoming'): # Is it a PHI?
|
||||
phi_key = (int(bid), int(_vid))
|
||||
if phi_key in predecl_phis:
|
||||
keep = True # ✅ Reliable tracking
|
||||
else:
|
||||
keep = False # Avoid namespace collision
|
||||
```
|
||||
|
||||
### Fix 2: Protect builder.vmap PHIs (block_lower.py:437-455)
|
||||
|
||||
**Before** (unconditional overwrite):
|
||||
```python
|
||||
for vid in created_ids:
|
||||
val = vmap_cur.get(vid)
|
||||
if val is not None:
|
||||
builder.vmap[vid] = val # ❌ Overwrites PHIs!
|
||||
```
|
||||
|
||||
**After** (PHI protection):
|
||||
```python
|
||||
for vid in created_ids:
|
||||
val = vmap_cur.get(vid)
|
||||
if val is not None:
|
||||
existing = builder.vmap.get(vid)
|
||||
# Don't overwrite existing PHIs - SSOT principle
|
||||
if existing is not None and hasattr(existing, 'add_incoming'):
|
||||
continue # ✅ Skip sync, preserve PHI
|
||||
builder.vmap[vid] = val
|
||||
```
|
||||
|
||||
## Verification
|
||||
|
||||
### Test Results
|
||||
```bash
|
||||
# ✅ LLVM matches VM
|
||||
NYASH_LLVM_USE_HARNESS=1 NYASH_LLVM_STRICT=1 ./target/release/hakorune --backend llvm /tmp/p1_return_i.hako
|
||||
# Output: Result: 3
|
||||
|
||||
# ✅ VM baseline
|
||||
./target/release/hakorune --backend vm /tmp/p1_return_i.hako
|
||||
# Output: RC: 3
|
||||
```
|
||||
|
||||
### Generated LLVM IR Comparison
|
||||
|
||||
**Before** (wrong):
|
||||
```llvm
|
||||
bb3:
|
||||
%"phi_1" = phi i64 [%"phi_3", %"bb6"]
|
||||
ret i64 0 ; ❌ Hardcoded 0!
|
||||
```
|
||||
|
||||
**After** (correct):
|
||||
```llvm
|
||||
bb3:
|
||||
%"phi_1" = phi i64 [%"phi_3", %"bb6"]
|
||||
ret i64 %"phi_1" ; ✅ Uses PHI value!
|
||||
```
|
||||
|
||||
## Design Lessons
|
||||
|
||||
### The SSOT Principle
|
||||
|
||||
**builder.vmap is the Single Source of Truth for PHI nodes**:
|
||||
- PHIs are created once in setup_phi_placeholders
|
||||
- PHIs must NEVER be overwritten by later instructions
|
||||
- vmap_cur is per-block and must filter PHIs correctly
|
||||
|
||||
### PHI Ownership Tracking
|
||||
|
||||
**llvmlite limitation**: PHI.basic_block is None until finalization
|
||||
**Solution**: Explicit tracking via `predeclared_ret_phis: Dict[(block_id, value_id), PHI]`
|
||||
|
||||
### Fail-Fast vs Silent Failures
|
||||
|
||||
The original filter silently dropped PHIs via broad exception handling:
|
||||
```python
|
||||
except Exception:
|
||||
keep = False # ❌ Silent failure!
|
||||
```
|
||||
|
||||
**Better approach**: Explicit checks with trace logging for debugging.
|
||||
|
||||
## Related Issues
|
||||
|
||||
- Phase 131: Block_end_values SSOT system
|
||||
- Phase 131-12: VMap snapshot investigation
|
||||
- Phase 131-14-B: Jump-only block resolution
|
||||
|
||||
## Files Modified
|
||||
|
||||
### JoinIR/Boundary 層（exit 値の SSOT を境界で明示）
|
||||
|
||||
- `src/mir/join_ir/lowering/simple_while_minimal.rs`（`Jump(k_exit, [i_param])`）
|
||||
- `src/mir/builder/control_flow/joinir/patterns/pattern1_minimal.rs`（`LoopExitBinding` を作って境界へ設定）
|
||||
|
||||
### LLVM Python 層（PHI SSOT の維持）
|
||||
|
||||
- `src/llvm_py/builders/block_lower.py`
|
||||
- PHI filtering を `predeclared_ret_phis` ベースへ変更（`phi.basic_block` 依存を排除）
|
||||
- `builder.vmap` へ sync する際、既存 PHI を上書きしない（PHI を SSOT として保護）
|
||||
|
||||
## Debug Environment Variables
|
||||
|
||||
```bash
|
||||
NYASH_LLVM_STRICT=1 # Fail-fast on errors
|
||||
NYASH_LLVM_TRACE_PHI=1 # PHI wiring traces
|
||||
NYASH_LLVM_TRACE_VMAP=1 # VMap operation traces
|
||||
NYASH_LLVM_DUMP_IR=/tmp/x.ll # Dump generated IR
|
||||
```
|
||||
|
||||
## Acceptance Criteria
|
||||
|
||||
✅ `/tmp/p1_return_i.hako` returns 3 in LLVM (was 0)
|
||||
✅ STRICT mode enabled, no fallback to 0
|
||||
✅ VM and LLVM results match
|
||||
✅ No regression on Phase 131 test cases
|
||||
✅ Generated LLVM IR uses `ret i64 %phi_1` not `ret i64 0`
|
||||
|
||||
## Next Steps
|
||||
|
||||
- [ ] Add regression test for exit PHI patterns
|
||||
- [ ] Document PHI ownership model in the LLVM harness docs (SSOT: `phase131-3-llvm-lowering-inventory.md`)
|
||||
@ -12,9 +12,24 @@
|
||||
| B2 | `/tmp/case_b_simple.hako` | ✅ | ✅ | ✅ | **PASS** - Simple print(42) without loop works |
|
||||
| C | `apps/tests/llvm_stage3_loop_only.hako` | ✅ | ✅ | ⚠️ | **TAG-RUN** - Loop ok; print/concat path segfaults |
|
||||
|
||||
## Phase 132 Update (2025-12-15)
|
||||
|
||||
✅ **MAJOR FIX**: Exit PHI wrong result bug fixed!
|
||||
- **Issue**: Pattern 1 の `return i` が LLVM だけ 0 を返す（VM は 3）
|
||||
- **Test**: `/tmp/p1_return_i.hako` が VM/LLVM ともに 3 を返すようになった
|
||||
- **Root Cause (two-layer)**:
|
||||
- JoinIR/Boundary: exit 値が境界を通っていなかった（exit_bindings / Jump args）
|
||||
- LLVM Python: builder.vmap の PHI placeholder が上書きされ、`ret` が 0 を参照
|
||||
- **Fix**:
|
||||
- JoinIR/Boundary: Pattern 1 で exit 値を明示的に渡す + LoopExitBinding を境界へ設定
|
||||
- LLVM Python: `predeclared_ret_phis` で PHI 所有を追跡し、PHI placeholder を上書きしない
|
||||
- **Details**:
|
||||
- Investigation: [phase132-llvm-exit-phi-wrong-result.md](investigations/phase132-llvm-exit-phi-wrong-result.md)
|
||||
- Phase summary: [phases/phase-132/README.md](phases/phase-132/README.md)
|
||||
|
||||
## Root Causes Identified
|
||||
|
||||
### 1. TAG-EMIT: Loop PHI → Invalid LLVM IR (Case B)
|
||||
### 1. TAG-EMIT: Loop PHI → Invalid LLVM IR (Case B) ✅ FIXED (Phase 131-10)
|
||||
|
||||
**File**: `apps/tests/loop_min_while.hako`
|
||||
|
||||
|
||||
@ -4,6 +4,7 @@
|
||||
|
||||
## 現在の Phase
|
||||
|
||||
- **Phase 132**: Exit Values Parity (VM == LLVM)
|
||||
- **Phase 131**: LLVM Lowering & InfiniteEarlyExit パターン実装 🚀
|
||||
- **Phase 33**: Box Theory Modularization
|
||||
|
||||
@ -41,4 +42,4 @@ phases/phase-131/
|
||||
|
||||
---
|
||||
|
||||
**最終更新**: 2025-12-14
|
||||
**最終更新**: 2025-12-15
|
||||
|
||||
66
docs/development/current/main/phases/phase-132/README.md
Normal file
66
docs/development/current/main/phases/phase-132/README.md
Normal file
@ -0,0 +1,66 @@
|
||||
# Phase 132: Exit Values Parity (VM == LLVM)
|
||||
|
||||
**Date**: 2025-12-15
|
||||
**Status**: ✅ Done
|
||||
**Scope**: Pattern 1（Simple While）で「ループ終了後の `return i`」が VM/LLVM で一致することを固定する
|
||||
|
||||
---
|
||||
|
||||
## 背景
|
||||
|
||||
最小ケース:
|
||||
|
||||
```nyash
|
||||
static box Main {
|
||||
main() {
|
||||
local i = 0
|
||||
loop(i < 3) { i = i + 1 }
|
||||
return i // 期待: 3
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
- VM: `RC: 3` ✅
|
||||
- LLVM: `Result: 0` ❌（修正前）
|
||||
|
||||
---
|
||||
|
||||
## 根本原因（2層）
|
||||
|
||||
### 1) JoinIR/Boundary 層: exit 値が境界を通っていない
|
||||
|
||||
- Pattern 1 の JoinIR で `k_exit` に渡す args が空のままだと、exit 側でホストの `variable_map["i"]` が更新されない。
|
||||
- その結果 `return i` が初期値（0）を返し得る。
|
||||
|
||||
### 2) LLVM Python 層: PHI の SSOT が壊れている
|
||||
|
||||
- `phi.basic_block` が llvmlite で確定前は `None` になり得るため、PHI を落とす filter を信頼できない。
|
||||
- `builder.vmap` にある PHI placeholder を、Pass A の “sync created values” が上書きしてしまい、`ret` が PHI ではなく `0` を参照することがある。
|
||||
|
||||
---
|
||||
|
||||
## 修正内容
|
||||
|
||||
### JoinIR/Boundary 層（exit 値を明示的に渡す）
|
||||
|
||||
- `src/mir/join_ir/lowering/simple_while_minimal.rs`
|
||||
- `Jump(k_exit, [i_param])` として exit 値を渡す
|
||||
- `src/mir/builder/control_flow/joinir/patterns/pattern1_minimal.rs`
|
||||
- `LoopExitBinding` を作成して `with_exit_bindings()` で境界に設定
|
||||
|
||||
### LLVM Python 層（PHI SSOT を保護する）
|
||||
|
||||
- `src/llvm_py/builders/block_lower.py`
|
||||
- PHI filtering を `predeclared_ret_phis` ベースにし、`phi.basic_block` 依存を排除
|
||||
- `builder.vmap` の既存 PHI（placeholder）を上書きしない（PHI を SSOT として保護）
|
||||
|
||||
---
|
||||
|
||||
## 検証
|
||||
|
||||
- `/tmp/p1_return_i.hako` が VM/LLVM で `3` を返す
|
||||
- `NYASH_LLVM_STRICT=1` でも “miss→0” に落ちない（Fail-Fast が維持される）
|
||||
|
||||
詳細ログ:
|
||||
- `docs/development/current/main/investigations/phase132-llvm-exit-phi-wrong-result.md`
|
||||
|
||||
@ -4,6 +4,7 @@ import sys
|
||||
from llvmlite import ir
|
||||
from trace import debug as trace_debug
|
||||
from trace import phi_json as trace_phi_json
|
||||
from phi_manager import PhiManager
|
||||
|
||||
|
||||
def is_jump_only_block(block_info: Dict) -> bool:
|
||||
@ -318,31 +319,19 @@ def lower_blocks(builder, func: ir.Function, block_by_id: Dict[int, Dict[str, An
|
||||
else:
|
||||
body_ops.append(inst)
|
||||
# Per-block SSA map
|
||||
# Phase 132-Post: Use PhiManager Box for PHI filtering (Box-First principle)
|
||||
vmap_cur: Dict[int, ir.Value] = {}
|
||||
try:
|
||||
for _vid, _val in (builder.vmap or {}).items():
|
||||
keep = True
|
||||
try:
|
||||
if hasattr(_val, 'add_incoming'):
|
||||
bb_of = getattr(getattr(_val, 'basic_block', None), 'name', None)
|
||||
bb_name = getattr(bb, 'name', None)
|
||||
# Normalize bytes vs str for robust comparison
|
||||
try:
|
||||
if isinstance(bb_of, bytes):
|
||||
bb_of = bb_of.decode()
|
||||
except Exception:
|
||||
pass
|
||||
try:
|
||||
if isinstance(bb_name, bytes):
|
||||
bb_name = bb_name.decode()
|
||||
except Exception:
|
||||
pass
|
||||
keep = (bb_of == bb_name)
|
||||
except Exception:
|
||||
keep = False
|
||||
if keep:
|
||||
vmap_cur[_vid] = _val
|
||||
vmap_cur = builder.phi_manager.filter_vmap_preserve_phis(
|
||||
builder.vmap or {},
|
||||
int(bid)
|
||||
)
|
||||
# Trace output for debugging (only if env var set)
|
||||
if os.environ.get('NYASH_LLVM_VMAP_TRACE') == '1':
|
||||
phi_count = sum(1 for v in vmap_cur.values() if hasattr(v, 'add_incoming'))
|
||||
print(f"[vmap/phi_filter] bb{bid} filtered vmap: {len(vmap_cur)} values, {phi_count} PHIs", file=sys.stderr)
|
||||
except Exception:
|
||||
# Fallback: copy all values without filtering
|
||||
vmap_cur = dict(builder.vmap)
|
||||
builder._current_vmap = vmap_cur
|
||||
# Phase 131-12-P1: Object identity trace for vmap_cur investigation
|
||||
@ -435,14 +424,14 @@ def lower_blocks(builder, func: ir.Function, block_by_id: Dict[int, Dict[str, An
|
||||
print(f"[vmap/id] Pass A bb{bid} snapshot id={id(vmap_snapshot)} keys={sorted(vmap_snapshot.keys())[:10]}", file=sys.stderr)
|
||||
# Phase 131-7: Sync ALL created values to global vmap (not just PHIs)
|
||||
# This ensures Pass C (deferred terminators) can access values from Pass A
|
||||
# Phase 132-Post: Use PhiManager Box for PHI protection (Box-First principle)
|
||||
try:
|
||||
for vid in created_ids:
|
||||
val = vmap_cur.get(vid)
|
||||
if val is not None:
|
||||
try:
|
||||
builder.vmap[vid] = val
|
||||
except Exception:
|
||||
pass
|
||||
# Create sync dict from created values only
|
||||
sync_dict = {vid: vmap_cur[vid] for vid in created_ids if vid in vmap_cur}
|
||||
# PhiManager.sync_protect_phis ensures PHIs are never overwritten (SSOT)
|
||||
builder.phi_manager.sync_protect_phis(builder.vmap, sync_dict)
|
||||
if os.environ.get('NYASH_LLVM_VMAP_TRACE') == '1':
|
||||
print(f"[vmap/sync] bb{bid} synced {len(sync_dict)} values to builder.vmap (PHIs protected)", file=sys.stderr)
|
||||
except Exception:
|
||||
pass
|
||||
# End-of-block snapshot
|
||||
|
||||
@ -53,6 +53,14 @@ def lower_return(
|
||||
# Fast path: if vmap has a concrete non-PHI value defined in this block, use it directly
|
||||
if isinstance(value_id, int):
|
||||
tmp0 = vmap.get(value_id)
|
||||
# Phase 132 Debug: trace vmap lookup
|
||||
import os, sys
|
||||
if os.environ.get('NYASH_LLVM_VMAP_TRACE') == '1':
|
||||
found = "FOUND" if tmp0 is not None else "MISSING"
|
||||
print(f"[vmap/ret] value_id={value_id} {found} in vmap, keys={sorted(list(vmap.keys())[:20])}", file=sys.stderr)
|
||||
if tmp0 is not None:
|
||||
is_phi = hasattr(tmp0, 'add_incoming')
|
||||
print(f"[vmap/ret] tmp0 type={'PHI' if is_phi else 'VALUE'}", file=sys.stderr)
|
||||
# Accept PHI or non-PHI values equally for returns; by this point
|
||||
# PHIs for the current block should have been materialized at the top.
|
||||
if tmp0 is not None:
|
||||
|
||||
@ -128,7 +128,10 @@ class NyashLLVMBuilder:
|
||||
# Heuristics for minor gated fixes
|
||||
self.current_function_name: Optional[str] = None
|
||||
self._last_substring_vid: Optional[int] = None
|
||||
# Map of (block_id, value_id) -> predeclared PHI for ret-merge if-merge prepass
|
||||
# Phase 132-Post: PHI Management Box (replaces predeclared_ret_phis dict)
|
||||
from phi_manager import PhiManager
|
||||
self.phi_manager = PhiManager()
|
||||
# Legacy support for code that still uses predeclared_ret_phis
|
||||
self.predeclared_ret_phis: Dict[Tuple[int, int], ir.Instruction] = {}
|
||||
|
||||
def build_from_mir(self, mir_json: Dict[str, Any]) -> str:
|
||||
|
||||
47
src/llvm_py/phi_manager.py
Normal file
47
src/llvm_py/phi_manager.py
Normal file
@ -0,0 +1,47 @@
|
||||
"""
|
||||
Phase 132-Post: PHI Management Box
|
||||
|
||||
Box-First principle: Encapsulate PHI lifecycle management
|
||||
- Track PHI ownership (which block created which PHI)
|
||||
- Protect PHIs from overwrites (SSOT principle)
|
||||
- Filter vmap to preserve PHI values
|
||||
"""
|
||||
|
||||
class PhiManager:
|
||||
"""PHI value lifecycle manager (Box pattern)"""
|
||||
|
||||
def __init__(self):
|
||||
self.predeclared = {} # (bid, vid) -> phi_value
|
||||
|
||||
def register_phi(self, bid: int, vid: int, phi_value):
|
||||
"""Register a PHI as owned by specific block"""
|
||||
self.predeclared[(bid, vid)] = phi_value
|
||||
|
||||
def is_phi_owned(self, bid: int, vid: int) -> bool:
|
||||
"""Check if PHI is owned by block"""
|
||||
return (bid, vid) in self.predeclared
|
||||
|
||||
def filter_vmap_preserve_phis(self, vmap: dict, target_bid: int) -> dict:
|
||||
"""Filter vmap while preserving owned PHIs
|
||||
|
||||
SSOT: PHIs in vmap are the single source of truth
|
||||
"""
|
||||
result = {}
|
||||
for vid, val in vmap.items():
|
||||
if hasattr(val, 'add_incoming'): # Is PHI?
|
||||
if self.is_phi_owned(target_bid, vid):
|
||||
result[vid] = val
|
||||
else:
|
||||
result[vid] = val
|
||||
return result
|
||||
|
||||
def sync_protect_phis(self, target_vmap: dict, source_vmap: dict):
|
||||
"""Sync values but protect existing PHIs (Fail-Fast)
|
||||
|
||||
Never overwrite PHIs - they are SSOT
|
||||
"""
|
||||
for vid, val in source_vmap.items():
|
||||
existing = target_vmap.get(vid)
|
||||
if existing and hasattr(existing, 'add_incoming'):
|
||||
continue # SSOT: Don't overwrite PHIs
|
||||
target_vmap[vid] = val
|
||||
@ -75,6 +75,7 @@ def setup_phi_placeholders(builder, blocks: List[Dict[str, Any]]):
|
||||
ph = ensure_phi(builder, bid0, dst0, bb0)
|
||||
# Keep a strong reference as a predeclared placeholder so
|
||||
# later ensure_phi calls during finalize re-use the same SSA node.
|
||||
# Phase 132-Post: Register PHI with PhiManager Box
|
||||
try:
|
||||
if not hasattr(builder, 'predeclared_ret_phis') or builder.predeclared_ret_phis is None:
|
||||
builder.predeclared_ret_phis = {}
|
||||
@ -82,6 +83,9 @@ def setup_phi_placeholders(builder, blocks: List[Dict[str, Any]]):
|
||||
builder.predeclared_ret_phis = {}
|
||||
try:
|
||||
builder.predeclared_ret_phis[(int(bid0), int(dst0))] = ph
|
||||
# Phase 132-Post: Box-First - register with PhiManager
|
||||
if hasattr(builder, 'phi_manager'):
|
||||
builder.phi_manager.register_phi(int(bid0), int(dst0), ph)
|
||||
if debug_mode:
|
||||
print(f"[phi_wiring/setup] Created PHI placeholder for v{dst0} in bb{bid0}")
|
||||
except Exception:
|
||||
|
||||
@ -84,6 +84,13 @@ def ensure_phi(builder, block_id: int, dst_vid: int, bb: ir.Block) -> ir.Instruc
|
||||
pass
|
||||
|
||||
ph = b.phi(builder.i64, name=f"phi_{dst_vid}")
|
||||
# Phase 132 Debug: Check if basic_block is set correctly
|
||||
import os, sys
|
||||
if os.environ.get('NYASH_PHI_ORDERING_DEBUG') == '1' or os.environ.get('NYASH_LLVM_VMAP_TRACE') == '1':
|
||||
phi_bb = getattr(ph, 'basic_block', None)
|
||||
phi_bb_name = getattr(phi_bb, 'name', None) if phi_bb is not None else None
|
||||
bb_name = getattr(bb, 'name', None)
|
||||
print(f"[phi_wiring/create] v{dst_vid} PHI created: phi.basic_block={phi_bb_name} expected={bb_name}", file=sys.stderr)
|
||||
builder.vmap[dst_vid] = ph
|
||||
trace({"phi": "ensure_create", "block": int(block_id), "dst": int(dst_vid), "after_term": block_has_terminator})
|
||||
return ph
|
||||
|
||||
@ -74,12 +74,32 @@ impl MirBuilder {
|
||||
// Phase 179-B: Create boundary from context
|
||||
// Phase 201: Use JoinInlineBoundaryBuilder for clean construction
|
||||
// Canonical Builder pattern - see docs/development/current/main/joinir-boundary-builder-pattern.md
|
||||
//
|
||||
// Phase 132: Add exit_bindings to enable ExitLineReconnector
|
||||
// This ensures `return i` after loop returns the final value (3) instead of initial (0)
|
||||
use crate::mir::join_ir::lowering::JoinInlineBoundaryBuilder;
|
||||
use crate::mir::join_ir::lowering::inline_boundary::LoopExitBinding;
|
||||
use crate::mir::join_ir::lowering::carrier_info::CarrierRole;
|
||||
|
||||
// Phase 132-Post: Extract k_exit's parameter ValueId from join_module (Box-First)
|
||||
let k_exit_func = join_module.require_function("k_exit", "Pattern 1");
|
||||
let join_exit_value = k_exit_func.params.first().copied()
|
||||
.expect("k_exit must have parameter for exit value");
|
||||
|
||||
// Phase 132: Create exit binding for loop variable
|
||||
let exit_binding = LoopExitBinding {
|
||||
carrier_name: ctx.loop_var_name.clone(),
|
||||
join_exit_value,
|
||||
host_slot: ctx.loop_var_id,
|
||||
role: CarrierRole::LoopState,
|
||||
};
|
||||
|
||||
let boundary = JoinInlineBoundaryBuilder::new()
|
||||
.with_inputs(
|
||||
vec![ValueId(0)], // JoinIR's main() parameter (loop variable)
|
||||
vec![ctx.loop_var_id], // Host's loop variable
|
||||
)
|
||||
.with_exit_bindings(vec![exit_binding]) // Phase 132: Enable exit PHI & variable_map update
|
||||
.with_loop_var_name(Some(ctx.loop_var_name.clone())) // Phase 33-16: Enable header PHI generation for SSA correctness
|
||||
.build();
|
||||
|
||||
|
||||
@ -25,13 +25,13 @@
|
||||
//!
|
||||
//! fn loop_step(i):
|
||||
//! exit_cond = !(i < 3)
|
||||
//! Jump(k_exit, [], cond=exit_cond) // early return if i >= 3
|
||||
//! Jump(k_exit, [i], cond=exit_cond) // Phase 132: pass i to k_exit
|
||||
//! print(i) // body
|
||||
//! i_next = i + 1 // increment
|
||||
//! Call(loop_step, [i_next]) // tail recursion
|
||||
//!
|
||||
//! fn k_exit():
|
||||
//! return 0
|
||||
//! fn k_exit(i_exit): // Phase 132: receives loop variable
|
||||
//! return i_exit // Phase 132: return loop value
|
||||
//! ```
|
||||
//!
|
||||
//! ## Design Notes
|
||||
@ -118,7 +118,8 @@ pub(crate) fn lower_simple_while_minimal(
|
||||
let i_next = alloc_value(); // ValueId(8) - i + 1
|
||||
|
||||
// k_exit locals
|
||||
let const_0_exit = alloc_value(); // ValueId(9) - exit return value
|
||||
// Phase 132: i_exit receives loop variable from Jump
|
||||
let i_exit = alloc_value(); // ValueId(9) - exit parameter (loop variable)
|
||||
|
||||
// ==================================================================
|
||||
// main() function
|
||||
@ -181,10 +182,11 @@ pub(crate) fn lower_simple_while_minimal(
|
||||
operand: cmp_lt,
|
||||
}));
|
||||
|
||||
// Jump(k_exit, [], cond=exit_cond)
|
||||
// Phase 132: Jump(k_exit, [i_param], cond=exit_cond)
|
||||
// Pass loop variable to exit continuation for return value parity
|
||||
loop_step_func.body.push(JoinInst::Jump {
|
||||
cont: k_exit_id.as_cont(),
|
||||
args: vec![],
|
||||
args: vec![i_param],
|
||||
cond: Some(exit_cond),
|
||||
});
|
||||
|
||||
@ -224,19 +226,14 @@ pub(crate) fn lower_simple_while_minimal(
|
||||
join_module.add_function(loop_step_func);
|
||||
|
||||
// ==================================================================
|
||||
// k_exit() function
|
||||
// k_exit(i_exit) function - Phase 132: receives loop variable
|
||||
// ==================================================================
|
||||
let mut k_exit_func = JoinFunction::new(k_exit_id, "k_exit".to_string(), vec![]);
|
||||
|
||||
// return 0 (Pattern 1 has no exit values)
|
||||
// Phase 188-Impl-3: Use pre-allocated const_0_exit (ValueId(9))
|
||||
k_exit_func.body.push(JoinInst::Compute(MirLikeInst::Const {
|
||||
dst: const_0_exit,
|
||||
value: ConstValue::Integer(0),
|
||||
}));
|
||||
let mut k_exit_func = JoinFunction::new(k_exit_id, "k_exit".to_string(), vec![i_exit]);
|
||||
|
||||
// Phase 132: return i_exit (loop variable at exit)
|
||||
// This ensures VM/LLVM parity for `return i` after loop
|
||||
k_exit_func.body.push(JoinInst::Ret {
|
||||
value: Some(const_0_exit),
|
||||
value: Some(i_exit),
|
||||
});
|
||||
|
||||
join_module.add_function(k_exit_func);
|
||||
|
||||
@ -585,6 +585,18 @@ impl JoinModule {
|
||||
pub fn mark_normalized(&mut self) {
|
||||
self.phase = JoinIrPhase::Normalized;
|
||||
}
|
||||
|
||||
// Phase 132-Post: Box-First principle - encapsulate function search logic
|
||||
/// Find function by name
|
||||
pub fn get_function_by_name(&self, name: &str) -> Option<&JoinFunction> {
|
||||
self.functions.values().find(|f| f.name == name)
|
||||
}
|
||||
|
||||
/// Find function by name or panic with descriptive message
|
||||
pub fn require_function(&self, name: &str, context: &str) -> &JoinFunction {
|
||||
self.get_function_by_name(name)
|
||||
.unwrap_or_else(|| panic!("{}: missing required function '{}'", context, name))
|
||||
}
|
||||
}
|
||||
|
||||
impl Default for JoinModule {
|
||||
|
||||
Reference in New Issue
Block a user