diff --git a/CURRENT_TASK.md b/CURRENT_TASK.md index 7d4bb33a..da5b1a1c 100644 --- a/CURRENT_TASK.md +++ b/CURRENT_TASK.md @@ -542,6 +542,47 @@ - コードベース整理完了 - v2 API への完全移行 - 保守性向上（デッドコード排除） + - [x] **Phase 204: JoinIR PHI Contract Verifier 強化** ✅ (完了: 2025-12-09) + - **目的**: Debug build での PHI 契約違反の早期検出 + - **実装内容**: + - 204-1: 設計ドキュメント作成 ✅ (phase204-phi-contract-verifier.md) + - 204-2: PHI dst overwrite 検出 ✅ + - `verify_no_phi_dst_overwrite()` 実装（SSA invariant 保証） + - `get_instruction_dst()` ヘルパー（全 MirInstruction 対応） + - 204-3: PHI inputs sanity checks ✅ + - `verify_phi_inputs_defined()` 実装（保守的閾値チェック） + - Full DFA verification は Phase 205+ に延期 + - 204-4: JoinValueSpace 領域検証 ⚠️ + - **延期理由**: LoopHeaderPhiInfo への JoinValueSpace 追加が必要（4+ ファイル変更） + - **代替策**: verify_phi_inputs_defined() で閾値チェック実装済み + - 204-5: 統合確認 ✅ + - `verify_joinir_contracts()` に全チェック統合 + - 全パターン（P1/P2/P3/P4）で有効化 + - 204-6: テスト実行 ✅ + - 821 tests PASS、退行なし + - 204-7: ドキュメント更新 ✅ + - **バグ修正**（Phase 204 作業中に発見）: + - `entry_block_remapped` → `entry_block` (line 592) + - `HashMap` → `BTreeMap` mismatch (reconnector.rs line 174) + - **統計**: + - 変更ファイル: 3ファイル (+115 lines in mod.rs) + - コミット: `0175e62d` (Phase 204-2), `[pending]` (Phase 204-3/5/7) + - テスト: 821 passed, 0 failed + - **成果**: + - PHI dst 上書き検出完了（手動ミスの早期発見） + - PHI inputs sanity check 完了（保守的検証） + - Debug-only verification（リリースビルドコストゼロ） + - 設計原則遵守（Fail-Fast, 箱化, 最小変更） + - **延期項目**: + - Task 204-4: JoinValueSpace 領域検証（Phase 205+ で実装予定） + - 理由: 高影響チェック優先、Phase 201-202 で衝突既解決 + - **検証カバレッジ**: + - ✅ PHI exists (Phase 200-3) + - ✅ PHI dst match (Phase 200-3) + - ✅ PHI dst not overwritten (Phase 204-2 ✨) + - ✅ PHI inputs sanity (Phase 204-3 ✨) + - ⚠️ PHI inputs DFA (Phase 205+ 計画) + - ⚠️ ValueId regions (Phase 205+ 計画) --- diff --git a/docs/development/current/main/phase204-phi-contract-verifier.md b/docs/development/current/main/phase204-phi-contract-verifier.md index 3d941283..911ecb94 100644 --- a/docs/development/current/main/phase204-phi-contract-verifier.md +++ b/docs/development/current/main/phase204-phi-contract-verifier.md @@ -322,9 +322,89 @@ pub struct LoopHeaderPhiInfo { - **Release build verification**: Debug-only for now (zero runtime cost) - **Cross-function verification**: Focus on single-function contracts first -## 7. References +## 7. Implementation Results (2025-12-09) + +### 7.1 Completed Tasks + +| Task | Status | Notes | +|------|--------|-------| +| 204-1: Design document | ✅ Complete | This document | +| 204-2: PHI dst overwrite detection | ✅ Complete | `verify_no_phi_dst_overwrite()` + helper | +| 204-3: PHI inputs sanity checks | ✅ Complete | `verify_phi_inputs_defined()` - conservative checks | +| 204-4: JoinValueSpace region verification | ⚠️ Deferred | Requires LoopHeaderPhiInfo extension (Phase 205+) | +| 204-5: Integration | ✅ Complete | All checks in `verify_joinir_contracts()` | +| 204-6: Unit tests | ✅ Complete | 821 tests PASS, no regressions | +| 204-7: Documentation | ✅ Complete | This section | + +### 7.2 Implementation Summary + +**Files Modified**: +1. `src/mir/builder/control_flow/joinir/merge/mod.rs`: +115 lines + - `verify_no_phi_dst_overwrite()` - PHI dst overwrite detection + - `get_instruction_dst()` - Helper to extract dst from MirInstruction + - `verify_phi_inputs_defined()` - Conservative sanity checks for PHI inputs + - `verify_joinir_contracts()` - Updated to call all verifiers +2. `src/mir/builder/control_flow/joinir/merge/exit_line/reconnector.rs`: 1 line + - Fixed `HashMap` → `BTreeMap` type mismatch + +**Bug Fixes** (discovered during Phase 204): +- Fixed `entry_block_remapped` → `entry_block` (line 592, mod.rs) +- Fixed HashMap/BTreeMap mismatch (line 174, reconnector.rs) + +**Test Results**: +- ✅ 821 tests PASS (all library tests) +- ✅ No regressions +- ✅ All existing patterns (P1/P2/P3/P4) verified + +**Commit**: `0175e62d` (Phase 204-2), `[pending]` (Phase 204-3/5/7) + +### 7.3 Design Decisions + +**Task 204-4 Deferral Rationale**: + +JoinValueSpace region verification requires passing `JoinValueSpace` from pattern lowerers to merge/mod.rs. This involves: +1. Adding `join_value_space: Option` to `LoopHeaderPhiInfo` (`#[cfg(debug_assertions)]`) +2. Updating all pattern lowerers (P1/P2/P3/P4) to pass JoinValueSpace +3. Implementing `verify_value_id_regions()` verification function + +**Why deferred to Phase 205+?**: +- Phase 204 focus: Immediate value (PHI dst overwrite detection) +- JoinValueSpace verification requires coordinated changes across 4+ files +- Conservative approach: Implement high-impact checks first +- Phase 201-202 already eliminated ValueId collision through region separation +- Verification would catch manual errors, but low urgency (no known issues) + +**Alternative approach** (if needed before Phase 205): +- Add sanity checks to existing verifiers (e.g., check PHI dst < 100000) +- Implemented in `verify_phi_inputs_defined()` as conservative threshold checks + +### 7.4 Verification Coverage + +| Contract | Verified | Checker | Status | +|----------|----------|---------|--------| +| **PHI exists** | ✅ | `verify_loop_header_phis()` | Phase 200-3 | +| **PHI dst match** | ✅ | `verify_loop_header_phis()` | Phase 200-3 | +| **PHI dst not overwritten** | ✅ | `verify_no_phi_dst_overwrite()` | Phase 204-2 ✨ | +| **PHI inputs sanity** | ✅ | `verify_phi_inputs_defined()` | Phase 204-3 ✨ | +| **PHI inputs DFA** | ⚠️ | - | Phase 205+ (future) | +| **Exit block exists** | ✅ | `verify_exit_line()` | Phase 200-3 | +| **Exit bindings valid** | ✅ | `verify_exit_line()` + `verify_exit_line_contract()` | Phase 200-3 + 190-impl-D | +| **ValueId regions** | ⚠️ | - | Phase 205+ (deferred) | + +### 7.5 Success Criteria Review + +1. ✅ All debug assertions enabled in test suite (821 tests pass) +2. ✅ PHI dst overwrite detection implemented (`verify_no_phi_dst_overwrite()`) +3. ⚠️ JoinValueSpace region verification deferred to Phase 205+ +4. ✅ No false positives (existing tests still pass) +5. ✅ Documentation updated (this document) + +**Overall**: 4/5 success criteria met, 1 deferred with clear rationale. + +## 8. References - Phase 200-3: Initial JoinIR verification infrastructure - Phase 201: JoinValueSpace introduction - Phase 190-impl-D-3: ExitLine contract verification - joinir-architecture-overview.md: Section 1.9 (ValueId Space Management) +- Commit `0175e62d`: Phase 204-2 implementation diff --git a/src/mir/builder/control_flow/joinir/merge/mod.rs b/src/mir/builder/control_flow/joinir/merge/mod.rs index 35598bfc..69bb6a04 100644 --- a/src/mir/builder/control_flow/joinir/merge/mod.rs +++ b/src/mir/builder/control_flow/joinir/merge/mod.rs @@ -889,6 +889,54 @@ fn get_instruction_dst(instr: &crate::mir::MirInstruction) -> Option= 100000 { + panic!( + "[JoinIRVerifier/Phase204-3] PHI {:?} has suspiciously large input {:?} from predecessor block {:?}", + dst, value_id, pred_block + ); + } + } + } + } +} + /// Verify all loop contracts for a merged JoinIR function /// /// This is the main entry point for verification. It runs all checks @@ -907,5 +955,6 @@ fn verify_joinir_contracts( ) { verify_loop_header_phis(func, header_block, loop_info, boundary); verify_no_phi_dst_overwrite(func, header_block, loop_info); // Phase 204-2 + verify_phi_inputs_defined(func, header_block); // Phase 204-3 verify_exit_line(func, exit_block, boundary); }