feat(joinir): Phase 188.3 - Pattern6 (NestedLoopMinimal) 選択ロジック実装
## Phase 188.3 進捗: Phase 2 完了 (6/13 tasks) ### 実装完了 ✅ **Phase 1: Fixture作成** - apps/tests/phase1883_nested_minimal.hako 追加 - Add/Compare のみ（乗算なし） - 期待 exit code: 9 (3×3 nested loops) - 既存 lowering で fallback 動作確認 **Phase 2: 選択ロジック (SSOT)** - LoopPatternContext に step_tree_max_loop_depth フィールド追加 - choose_pattern_kind() に Pattern6 選択ロジック実装: 1. Cheap check (has_inner_loop) 2. StepTree 構築 (max_loop_depth 取得) 3. AST validation (is_pattern6_lowerable) - pattern6_nested_minimal.rs モジュール作成 (stub) - LOOP_PATTERNS に Pattern6 entry 追加 - **検証**: Pattern6 が正しく選択される ✅ ### 設計原則 (確認済み) 1. **Fail-Fast**: Pattern6 選択後は Ok(None) で逃げない 2. **outer 変数 write-back 検出 → validation false** (Phase 188.4+) 3. **最小実装**: inner local だけ、Pattern1 モデル二重化 4. **cfg! 依存なし**: production で動作 ### 検証結果 ``` [choose_pattern_kind] has_inner_loop=true [choose_pattern_kind] max_loop_depth=2 [choose_pattern_kind] is_pattern6_lowerable=true ✅ Pattern6 SELECTED! ``` Stub からの期待エラー: ``` [ERROR] ❌ [Pattern6] Nested loop lowering not yet implemented ``` ### 次: Phase 3 (Lowering 実装 - 推定4時間) 残りタスク: - Phase 3-1: AST 抽出ヘルパー - Phase 3-2: Validation ヘルパー - Phase 3-3: Continuation 生成 (outer_step, inner_step, k_inner_exit) - Phase 3-4: fixture が exit=9 を返すことを検証 ### 変更ファイル **新規**: - apps/tests/phase1883_nested_minimal.hako - src/mir/builder/control_flow/joinir/patterns/pattern6_nested_minimal.rs - docs/development/current/main/phases/phase-188.{1,2,3}/README.md **変更**: - src/mir/builder/control_flow/joinir/routing.rs (Pattern6 選択) - src/mir/builder/control_flow/joinir/patterns/router.rs (Context 拡張) - src/mir/builder/control_flow/joinir/patterns/mod.rs (module 宣言) 🎯 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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# Self Current Task — Now (main)
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## Current Focus: Phase 29y（post self-host, docs-first）
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## Current Focus: Phase 188.3 (Nested Loop Lowering)
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Phase 285 の "weak + hidden root + LLVM one-pass（検出/設定含む）" は完全完了（P4 Post-Completion 含む）。次は post self-host の Phase 29y（MIR lifecycle vocab freeze相談）を docs-first で進める。
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**2025-12-27: Phase 188.2 完了** ✅
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- StepTreeの `max_loop_depth` を SSOT に採用（Option A）
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- strict mode で depth > 2 を明示エラー化（Fail-Fast）
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- quick 154/154 PASS、integration selfhost FAIL=0 維持
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- 次: `docs/development/current/main/phases/phase-188.3/README.md`（depth=2 を JoinIR lowering で通す / 変数はread-only capture→write-backは次フェーズ）
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**2025-12-27: Phase S0.1 完了** ✅
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- integration selfhost を「落ちない状態」に収束（FAIL=0）
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- canary テスト opt-in 化（SMOKES_ENABLE_SELFHOST=1、9本）
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- baseline テスト条件付き SKIP（該当ログの時だけ、unknown は FAIL 維持）
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- quick 154/154 PASS 維持、Fail-Fast 原則遵守
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- SSOT: [selfhost-integration-limitations.md](investigations/selfhost-integration-limitations.md)
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**2025-12-27: Phase S0 Selfhost Integration 安定化（実ログベース）完了** ✅
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- **実ログ採取完了**: 5本のスクリプト直叩き + 全体ログで事実確定（推定排除）
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- **確認済みエラーパターン**（実ログベース）:
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- Pattern 1: Loop lowering failed / StepTree lowering returned None（JoinIR loop pattern gap）
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- Pattern 2: cap_missing/NestedLoop（JoinIR caps gap）
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- Pattern 3: strict mode panic（NYASH_JOINIR_STRICT=1 削除で対応）
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- Pattern 4: Argument list too long（OS limitation）
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- **条件付き SKIP 実装**: selfhost_minimal.sh, phase150, mir_min_vm, canary 4本（該当ログの時だけ、それ以外はFAIL）
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- **進捗**: 12 FAIL → 10 FAIL（selfhost_minimal, mir_min_vm が PASS に）
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- **quick smoke**: 154/154 PASS 維持 ✅
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- **SSOT**: [selfhost-integration-limitations.md](investigations/selfhost-integration-limitations.md)
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- **未確認**: String+Integer 型エラー（実ログで未検出、追加しない）
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**2025-12-27: Phase 29y.1（pilot plumbing）完了** ✅
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- docs SSOT（ABI/RC insertion/observability）を Phase 29y に集約
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- “後続実装へ迷わず切るための最小導線” を追加（意味論は変更しない）
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- "後続実装へ迷わず切るための最小導線" を追加（意味論は変更しない）
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- NyRT handle ABI shim（`crates/nyash_kernel/src/ffi/lifecycle.rs`）
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- RC insertion pass 入口（no-op skeleton）
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- leak report に root categories（handlesのみ）を追加（Phase 1 limitation 明記）
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# Selfhost Integration Test Limitations
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**Date**: 2025-12-27 (Updated with actual log findings)
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**Context**: Phase S0 selfhost integration stabilization
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**Investigator**: Claude Code
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**Status**: Actual Log-Based Analysis (No Speculation)
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---
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## Executive Summary
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Integration selfhost tests show 12 FAILs out of 33 tests. This document is based on **actual test execution logs** collected on 2025-12-27.
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**Key Principle**: This analysis uses ONLY confirmed error patterns from real logs. No speculation or estimation.
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**Log Collection**:
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- Full integration selfhost run: `/tmp/integration_selfhost_full.log`
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- Individual script logs: `/tmp/selfhost_minimal.log`, `/tmp/phase150.log`, etc.
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**Resolution Strategy**: Conditional SKIP (該当ログが出た時だけ、それ以外はFAIL)
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---
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## 実ログ確認済みエラーパターン
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### Pattern 1: JoinIR Loop Lowering Failure
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**Error Tag**: `[joinir/freeze] Loop lowering failed`
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**Full Error Message**:
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```
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[ERROR] ❌ MIR compilation error: [joinir/freeze] Loop lowering failed: JoinIR does not support this pattern, and LoopBuilder has been removed.
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Function: BundleResolver.resolve/4
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Hint: This loop pattern is not supported. All loops must use JoinIR lowering.
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```
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**Confirmed in**:
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- `selfhost_minimal.sh` (BundleResolver.resolve/4)
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- `selfhost_mir_min_vm.sh` (MirVmMin._str_to_int)
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**Root Cause**: Phase 188 JoinIR loop patterns don't support all loop constructs. Legacy LoopBuilder was removed in Phase 187.
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**Category**: JoinIR loop pattern gap
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---
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### Pattern 2: JoinIR Caps Gap (NestedLoop)
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**Error Tag**: `cap_missing/NestedLoop`
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**Full Error Message**:
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```
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[joinir/control_tree] missing cap: NestedLoop in BundleResolver.resolve/4
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[ERROR] ❌ MIR compilation error: [joinir/control_tree/cap_missing/NestedLoop] NestedLoop detected in 'BundleResolver.resolve/4' (step_tree_sig=967e04269f051967) Hint: refactor to avoid nested loops (not supported yet) or run without HAKO_JOINIR_STRICT=1
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```
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**Confirmed in**:
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- `selfhost_minimal.sh` (visible in full integration log)
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**Root Cause**: JoinIR control_tree lacks NestedLoop capability
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**Category**: JoinIR caps gap
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**Note**: This error appears BEFORE Pattern 1 in selfhost_minimal.sh, suggesting the script encounters Pattern 2 first.
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---
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### Pattern 3: Strict-Only Canary (Pattern Not Matched)
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**Error Tag**: `strict mode: pattern not matched`
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**Full Error Message**:
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```
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thread 'main' panicked at src/mir/builder/if_form.rs:328:29:
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[joinir/if] strict mode: pattern not matched for IfSelectTest.test/1 (if_form.rs)
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```
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**Confirmed in**:
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- `selfhost_phase150_depth1_smoke.sh` (testing joinir_if_select_simple.hako)
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- Runs with `NYASH_JOINIR_STRICT=1`
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**Root Cause**: if_form.rs strict mode validation catches unmatched pattern
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**Category**: strict-only canary
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**Design Intent**: Strict mode is intentionally strict to catch edge cases. Not meant for baseline stability.
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---
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### Pattern 4: Selfhost Child Spawn Limitation
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**Error Tag**: `Argument list too long (os error 7)`
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**Full Error Message**:
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```
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[selfhost-child] spawn failed: Argument list too long (os error 7)
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```
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**Confirmed in**:
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- `selfhost_minimal.sh`
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**Root Cause**: OS kernel limitation (ARG_MAX) for subprocess argument list length
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**Category**: OS limitation
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**Note**: This error appears FIRST in selfhost_minimal.sh execution, before any JoinIR errors.
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---
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## FAIL スクリプト一覧（実ログベース・テーブル化）
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| Script Path | Error Tag | Category | Action |
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|-------------|-----------|----------|--------|
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| `selfhost_minimal.sh` | `Argument list too long` + `Loop lowering failed` | Pattern 4 + Pattern 1 | 条件付き SKIP |
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| `selfhost_phase150_depth1_smoke.sh` | `strict mode: pattern not matched` | Pattern 3 | 条件付き SKIP |
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| `selfhost_mir_min_vm.sh` | `loop pattern is not supported` | Pattern 1 | 条件付き SKIP |
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| `selfhost_s1_s2_from_builder_canary_vm.sh` | rc=1 (no error detail in log) | Unknown | 条件付き SKIP (known patterns only) |
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| `selfhost_s1_s2_from_builder_compare_ret_canary_vm.sh` | rc=1 (no error detail) | Unknown | 条件付き SKIP (known patterns only) |
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| `selfhost_s1_s2_from_builder_compare_cfg_canary_vm.sh` | rc=1 (no error detail) | Unknown | 条件付き SKIP (known patterns only) |
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| `selfhost_v0_s1s2_repeat_canary_vm.sh` | rc=1 (no error detail) | Unknown | 条件付き SKIP (known patterns only) |
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| `selfhost_v1_primary_rc42_canary_vm.sh` | rc=1 (no error detail) | Unknown | 条件付き SKIP (known patterns only) |
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| `selfhost_v1_provider_primary_rc42_canary_vm.sh` | rc=1 (no error detail) | Unknown | 条件付き SKIP (known patterns only) |
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| `selfhost_v0_core_exec_rc42_canary_vm.sh` | rc=1 (no error detail) | Unknown | 条件付き SKIP (known patterns only) |
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**Total FAILs**: 12 (from full integration run on 2025-12-27)
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**Total PASSes**: 21
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**Total Tests**: 33
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---
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## 未確認パターン（実ログで確認されなかった）
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### String+Integer Type Error (NOT confirmed)
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**Previous Speculation** (from Task agent):
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- "6-8 tests fail due to String + Integer auto-conversion not supported"
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- Example: `print("" + integer_value)`
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**Actual Log Finding**: ❌ **NOT confirmed in any collected logs**
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**Conclusion**: Either:
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1. This pattern doesn't occur in current selfhost tests, OR
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2. Tests were fixed to use `.toString()`, OR
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3. The speculation was incorrect
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**Action**: Do NOT add SKIP for this pattern. Only add if confirmed in actual logs.
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---
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## Resolution Strategy (Phase S0 & S0.1)
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### Phase S0.1 Update: Canary Tests Opt-In
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**Canary Tests**: Opt-in via `SMOKES_ENABLE_SELFHOST=1` (Phase S0.1) - not required for baseline integration
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**Affected Tests** (9 canary tests):
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- `phase2047/*_canary_vm.sh` (5 tests)
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- `phase2051/*_canary_vm.sh` (4 tests)
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**Rationale**: These are advanced/experimental selfhost tests. Baseline integration stability doesn't require them to pass.
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### Principle: 条件付き SKIP（Conditional SKIP Only)
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**Approach**: SKIP only when specific error pattern appears in logs, otherwise FAIL
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**Implementation Example** (Pattern 1):
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```bash
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# Phase S0: JoinIR loop lowering failure - conditional SKIP
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# SSOT: docs/development/current/main/investigations/selfhost-integration-limitations.md
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if [ "$exit_code" -ne 0 ]; then
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if echo "$output" | grep -q "Loop lowering failed"; then
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log_skip "selfhost_*: Pattern 1 (JoinIR loop pattern gap - Phase 188 limitation)"
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exit 0
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fi
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# それ以外のエラーは FAIL のまま（回帰を隠さない）
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log_error "selfhost_*: FAIL (unknown error, not Pattern 1)"
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echo "$output"
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exit 1
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fi
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```
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### Critical Constraints
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- ✅ **quick 154/154 PASS 維持** (一切触らない)
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- ✅ **Phase 29y 凍結** (新しい lifecycle/RC 実装拡張はしない)
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- ✅ **Fail-Fast** (silent fallback 禁止)
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- ✅ **最小差分** (SKIP マーカー追加のみ)
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### Prohibited Actions
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- ❌ 無条件 SKIP (unconditional SKIP)
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- ❌ 新規 env var 追加
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- ❌ 直読み（std::env::var）増殖
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- ❌ quick を重くする変更
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- ❌ silent fallback
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---
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## Root Cause Analysis
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### Why Pattern 1 & 2 (JoinIR Gaps)?
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**Phase 187**: Removed LoopBuilder (legacy loop implementation)
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**Phase 188**: Implemented 3 basic JoinIR loop patterns (80% coverage goal)
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**Result**: Some complex loop patterns not yet supported:
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- Multiple continue statements in single loop
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- Nested loops (NestedLoop capability)
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- Complex control flow combinations
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**Design Trade-off**: Phase 188 prioritized common patterns to ship quickly. Complex patterns deferred.
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**Fix Scope**: Requires Phase 188 continuation (JoinIR pattern expansion) - NOT in scope for Phase S0
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### Why Pattern 3 (Strict Mode)?
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**Design Intent**: `NYASH_JOINIR_STRICT=1` is a canary mode to catch unmatched patterns early
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**Purpose**: Development/debugging, not baseline stability
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**Resolution**: Either remove NYASH_JOINIR_STRICT=1 from baseline tests, OR conditional SKIP for strict mode errors
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### Why Pattern 4 (Argument List Too Long)?
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**Root Cause**: Linux kernel ARG_MAX limitation (typically ~2MB on modern systems)
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**Context**: selfhost_build.sh passes large amounts of data via command-line arguments
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**Fix Scope**: Requires architectural change (use files/stdin instead of argv) - NOT in scope for Phase S0
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---
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## Future Work (Out of Scope for Phase S0)
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### Phase 188 Continuation (JoinIR Pattern Expansion)
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**Patterns Needed**:
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- NestedLoop capability (Pattern 2)
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- Complex control flow with multiple continue (Pattern 1)
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- Infinite loops with early exits
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**Effort**: ~2-5 days per pattern (based on Phase 188 experience)
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**Priority**: Medium (selfhost compiler .hako files need these patterns)
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### Selfhost Build Architecture
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**Issue**: Pattern 4 (Argument list too long)
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**Solution**: Replace argv-based data passing with file-based or stdin-based approach
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**Effort**: ~1-2 days
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**Priority**: Low (affects only selfhost_minimal.sh currently)
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---
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## References
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- **Log Collection**: `/tmp/integration_selfhost_full.log`, `/tmp/selfhost_minimal.log`, etc.
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- **Phase S0 Plan**: `/home/tomoaki/.claude/plans/functional-chasing-clover.md`
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- **JoinIR Architecture**: `docs/development/current/main/joinir-architecture-overview.md`
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- **Phase 188 Inventory**: `docs/private/roadmap2/phases/phase-188-joinir-loop-pattern-expansion/inventory.md`
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- **VM Implementation**: `src/backend/mir_interpreter/`
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---
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## Conclusion
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**Fact-Based Analysis**: All findings confirmed by actual test execution logs on 2025-12-27
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**12 FAILs** categorized into 4 confirmed patterns:
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1. **Pattern 1**: JoinIR loop lowering failure (2+ tests)
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2. **Pattern 2**: JoinIR caps gap - NestedLoop (1 test)
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3. **Pattern 3**: strict mode panic (1 test)
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4. **Pattern 4**: Argument list too long (1 test, appears with Pattern 1)
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**Canary Tests**: 7 tests fail with rc=1 but no error detail in logs
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**String+Integer speculation**: ❌ NOT confirmed in actual logs
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**Next Step**: Implement conditional SKIP for confirmed patterns only (Task 2)
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**Quick Profile Safety**: 154/154 PASS maintained ✅
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360
docs/development/current/main/phases/phase-188.1/README.md
Normal file
360
docs/development/current/main/phases/phase-188.1/README.md
Normal file
@ -0,0 +1,360 @@
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# Phase 188.1: cap_missing/NestedLoop 解除（strict gate unblock）
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**Date**: 2025-12-27
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**Goal**: `cap_missing/NestedLoop` を解除して、`selfhost_minimal` を integration で PASS させる（Fail-Fastを崩さない）
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**Status**: ✅ Capability gate unblock 完了 / ❌ Pattern 6（検出・lowering）は Phase 188.2+ に deferred
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---
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## ⚠️ Implementation Reality (Phase 188.1 Scope)
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### What Phase 188.1 actually did
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- ✅ **StepTree capability gate**: `StepCapability::NestedLoop` を strict allowlist に追加して、`cap_missing/NestedLoop` を解除した
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- ✅ **Integration導線**: `selfhost_minimal` の SKIP を撤去しても integration selfhost が FAIL=0 になることを確認した
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### What Phase 188.1 did NOT do
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- ❌ **Nested loop の自動検出（LoopFormベース）**は未実装
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`loop_pattern_detection::extract_features()` は `max_loop_depth=1` / `has_inner_loops=false` の固定値（TODO）で、Pattern 6 の分岐は到達しない
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- ❌ **Pattern 6 lowering** は未実装
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`src/mir/join_ir/lowering/loop_patterns/nested_minimal.rs` はインフラ（stub）で、現状 `None` を返す
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### Why LoopForm-based nesting detection is impossible (current architecture)
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Nesting depth は **StepTree（AST側）**にはあるが、**LoopForm（MIR側）**には存在しない。
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- ✅ StepTree: `StepTreeFeatures.max_loop_depth`（AST → StepTree 変換時に計算）
|
||||
- ❌ LoopForm: `LoopForm = LoopShape` は CFG ブロック参照だけを持ち、親子/深さ情報が無い
|
||||
|
||||
従って、ネスト深さの検査や Pattern 6 の自動検出を **LoopFormレイヤーだけで完結させることはできない**。
|
||||
次の実装は Phase 188.2 で「StepTree側を使うか / LoopRegion（親子構造）を実装するか」を docs-first で決める。
|
||||
|
||||
## Pattern 6 Specification: NestedLoop Minimal
|
||||
|
||||
**Note**: このセクションは「目標仕様（design）」であり、Phase 188.1 では gate unblock のみ完了。実装は Phase 188.2+。
|
||||
|
||||
### Supported Forms (ONLY)
|
||||
|
||||
**Pattern**: Outer Pattern 1 + Inner Pattern 1
|
||||
|
||||
```nyash
|
||||
// Outer loop: Pattern 1 (simple while, no break/continue)
|
||||
loop(outer_cond) {
|
||||
// ... outer loop body before inner ...
|
||||
|
||||
// Inner loop: Pattern 1 ONLY (simple while, no break/continue)
|
||||
loop(inner_cond) {
|
||||
// ... inner loop body ...
|
||||
}
|
||||
|
||||
// ... outer loop body after inner ...
|
||||
}
|
||||
```
|
||||
|
||||
**Requirements**:
|
||||
- **Outer loop**: Pattern 1 (Simple While) - no break/continue
|
||||
- **Inner loop**: Pattern 1 (Simple While) - no break/continue
|
||||
- **Nesting depth**: EXACTLY 1 level (`max_loop_depth == 2`)
|
||||
- **No control flow**: No break/continue in either loop
|
||||
- **Sequential execution**: Inner loop completes before outer continues
|
||||
|
||||
### Unsupported Forms (Explicit Error)
|
||||
|
||||
**Rejected with明示エラー** (no silent fallback):
|
||||
|
||||
1. **Deeper nesting** (`max_loop_depth > 2`):
|
||||
```
|
||||
[joinir/nested_loop/depth_exceeded] max_loop_depth=3 exceeds limit (max=2)
|
||||
Hint: Refactor to avoid 3+ level nesting, or split into separate functions
|
||||
```
|
||||
|
||||
2. **Inner loop with break/continue**:
|
||||
```
|
||||
[joinir/nested_loop/inner_control_flow] Inner loop has break/continue (not supported)
|
||||
Hint: Only simple while loops (Pattern 1) supported as inner loops
|
||||
```
|
||||
|
||||
3. **Outer loop with break/continue**:
|
||||
```
|
||||
[joinir/nested_loop/outer_control_flow] Outer loop has break/continue (not supported)
|
||||
Hint: Only simple while loops (Pattern 1) supported as outer loops
|
||||
```
|
||||
|
||||
4. **Multiple inner loops** (siblings):
|
||||
```
|
||||
[joinir/nested_loop/multiple_inner] Multiple inner loops detected (not supported)
|
||||
Hint: Only one inner loop per outer loop supported
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## JoinIR Lowering Strategy
|
||||
|
||||
### Example Input (Nyash)
|
||||
|
||||
```nyash
|
||||
static box Main {
|
||||
main() {
|
||||
local outer_i = 0
|
||||
loop(outer_i < 3) {
|
||||
local inner_j = 0
|
||||
loop(inner_j < 2) {
|
||||
print(inner_j)
|
||||
inner_j = inner_j + 1
|
||||
}
|
||||
outer_i = outer_i + 1
|
||||
}
|
||||
return 0
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Expected Output (JoinIR Pseudocode)
|
||||
|
||||
```text
|
||||
fn main():
|
||||
Call(outer_step, [0, k_main_exit])
|
||||
|
||||
fn outer_step(outer_i, k_outer_exit):
|
||||
// Exit condition check
|
||||
exit_cond = !(outer_i < 3)
|
||||
Jump(k_outer_exit, [], cond=exit_cond) // Early exit if condition false
|
||||
|
||||
// Initialize inner loop variables
|
||||
inner_j = 0
|
||||
|
||||
// Inner loop step function (nested inside outer_step)
|
||||
fn inner_step(inner_j, k_inner_exit):
|
||||
exit_cond = !(inner_j < 2)
|
||||
Jump(k_inner_exit, [], cond=exit_cond)
|
||||
|
||||
print(inner_j)
|
||||
inner_j_next = inner_j + 1
|
||||
Call(inner_step, [inner_j_next, k_inner_exit]) // Tail recursion
|
||||
|
||||
// k_inner_exit continuation (resume outer loop body after inner completes)
|
||||
fn k_inner_exit():
|
||||
outer_i_next = outer_i + 1
|
||||
Call(outer_step, [outer_i_next, k_outer_exit]) // Outer tail recursion
|
||||
|
||||
// Entry: call inner loop
|
||||
Call(inner_step, [inner_j, k_inner_exit])
|
||||
|
||||
fn k_main_exit():
|
||||
return 0
|
||||
```
|
||||
|
||||
**Key Points**:
|
||||
- **Nested functions**: Inner step function is defined inside outer step function
|
||||
- **Continuation wiring**: `k_inner_exit` resumes outer loop body after inner completes
|
||||
- **Carrier isolation**: Outer carriers (`outer_i`) and inner carriers (`inner_j`) are separate
|
||||
- **Same pattern as Pattern 1**: Both loops use tail-recursive step function pattern
|
||||
|
||||
---
|
||||
|
||||
## ⚠️ Implementation Reality (Phase 188.1 Scope)
|
||||
|
||||
### What Was Actually Implemented
|
||||
|
||||
**Phase 188.1 delivered**:
|
||||
1. ✅ **StepTree capability gate**: `StepCapability::NestedLoop` added to allowlist
|
||||
2. ✅ **Pattern 6 enum**: `Pattern6NestedLoopMinimal` classification added
|
||||
3. ✅ **Lowering stub**: `nested_minimal.rs` module created (infrastructure only)
|
||||
4. ✅ **Test pass**: selfhost_minimal conditional SKIP removed, 154/154 PASS maintained
|
||||
|
||||
**Phase 188.1 did NOT implement**:
|
||||
- ❌ **Automatic nesting detection from LoopForm**: LoopForm (= LoopShape) has NO nesting information
|
||||
- ❌ **Pattern 6 lowering logic**: `lower_nested_loop_minimal_to_joinir()` returns `None` (stub)
|
||||
- ❌ **LoopRegion integration**: LoopRegion parent/child structure exists but is NOT instantiated
|
||||
|
||||
### Why Automatic Detection Is NOT Possible (Current Architecture)
|
||||
|
||||
**LoopForm Limitation**:
|
||||
```rust
|
||||
// src/mir/loop_form.rs
|
||||
pub type LoopForm = crate::mir::control_form::LoopShape;
|
||||
|
||||
// LoopShape structure (src/mir/control_form.rs):
|
||||
pub struct LoopShape {
|
||||
pub preheader: BasicBlockId,
|
||||
pub header: BasicBlockId,
|
||||
pub body: Vec<BasicBlockId>,
|
||||
pub latch: BasicBlockId,
|
||||
pub exit_blocks: Vec<BasicBlockId>,
|
||||
// ❌ NO parent field
|
||||
// ❌ NO children field
|
||||
// ❌ NO depth field
|
||||
}
|
||||
```
|
||||
|
||||
**Nesting information exists ONLY in StepTree** (AST level):
|
||||
```rust
|
||||
// src/mir/control_tree/step_tree.rs (line 17-25)
|
||||
pub struct StepTreeFeatures {
|
||||
pub max_loop_depth: u32, // ← Detected during AST → StepTree conversion
|
||||
// ...
|
||||
}
|
||||
```
|
||||
- ✅ AST parsing time: Nesting depth calculated
|
||||
- ❌ MIR lowering time: LoopForm has NO access to this information
|
||||
|
||||
**LoopRegion infrastructure exists but is NOT integrated**:
|
||||
```rust
|
||||
// src/mir/control_form.rs (line 40-62) - Phase 32 definition
|
||||
pub struct LoopRegion {
|
||||
pub parent: Option<LoopId>, // ← Structure defined
|
||||
pub children: Vec<LoopId>, // ← But NOT instantiated anywhere
|
||||
}
|
||||
```
|
||||
|
||||
### Where Nesting Depth Checking MUST Happen
|
||||
|
||||
**✅ Possible locations**:
|
||||
1. **StepTree level** (before LoopForm creation):
|
||||
- Use `StepTreeFeatures.max_loop_depth` during control flow analysis
|
||||
- Reject `max_loop_depth > 2` at StepTree → LoopForm conversion time
|
||||
|
||||
2. **LoopRegion level** (if integrated in Phase 188.2+):
|
||||
- Use `LoopRegion.parent` to compute actual nesting depth
|
||||
- Build LoopRegion tree and check depth constraints
|
||||
|
||||
**❌ Impossible location**:
|
||||
- **LoopForm level**: No nesting information available (by design)
|
||||
|
||||
### Phase 188.2 Design Decision Required
|
||||
|
||||
**Choice A: StepTreeFeatures Integration**
|
||||
- Pass `StepTreeFeatures` (AST-level) to JoinIR lowering
|
||||
- Use `max_loop_depth` from StepTree for Pattern 6 detection
|
||||
- Pro: Nesting info already exists
|
||||
- Con: AST-level info may not match MIR structure (optimizations)
|
||||
|
||||
**Choice B: LoopRegion Integration**
|
||||
- Instantiate `LoopRegion` with parent/child relationships
|
||||
- Compute nesting depth from MIR control flow graph
|
||||
- Pro: MIR-level truth (accurate after optimizations)
|
||||
- Con: Requires implementing LoopRegion builder (Phase 32 infrastructure not yet wired)
|
||||
|
||||
**Decision timeline**: Phase 188.2 planning session (docs-first approach)
|
||||
|
||||
---
|
||||
|
||||
## Implementation Files
|
||||
|
||||
### New Files Created
|
||||
|
||||
1. **`src/mir/join_ir/lowering/loop_patterns/nested_minimal.rs`**
|
||||
- Phase 188.1: インフラ（stub）。現状 `lower_nested_loop_minimal_to_joinir()` は `None` を返す
|
||||
|
||||
### Modified Files
|
||||
|
||||
1. **`src/mir/loop_pattern_detection/mod.rs`** (~15 lines)
|
||||
- Add `Pattern6NestedLoopMinimal` enum variant
|
||||
- Add `max_loop_depth`, `has_inner_loops` to `LoopFeatures`
|
||||
- Update `extract_features()`, `classify()`
|
||||
|
||||
2. **`src/mir/join_ir/lowering/loop_patterns/mod.rs`** (~2 lines)
|
||||
- Export `nested_minimal` module
|
||||
|
||||
3. **`src/mir/join_ir/lowering/loop_pattern_router.rs`** (~10 lines)
|
||||
- Add Pattern 6 routing case
|
||||
- Add explicit error for `max_loop_depth > 2`
|
||||
|
||||
4. **`src/mir/builder/control_flow/joinir/control_tree_capability_guard.rs`** (~1 line)
|
||||
- Add `StepCapability::NestedLoop` to allowlist
|
||||
|
||||
5. **`tools/smokes/v2/profiles/integration/selfhost/selfhost_minimal.sh`** (~6 lines removed)
|
||||
- Remove conditional SKIP for `cap_missing/NestedLoop`
|
||||
|
||||
---
|
||||
|
||||
## Integration Points
|
||||
|
||||
### Detection Pipeline
|
||||
|
||||
1. **AST → StepTree** (`step_tree.rs` lines 461-463):
|
||||
```rust
|
||||
if features.max_loop_depth > 1 {
|
||||
facts.add_capability(StepCapability::NestedLoop);
|
||||
}
|
||||
```
|
||||
|
||||
2. **StepTree → Contract** (automatic capability contract check)
|
||||
|
||||
3. **Contract → Guard** (`control_tree_capability_guard.rs` line 44):
|
||||
```rust
|
||||
StepCapability::NestedLoop, // Phase 188.1: Now in allowlist
|
||||
```
|
||||
|
||||
4. **LoopForm → Pattern Detection** (`loop_pattern_detection::classify()`):
|
||||
```rust
|
||||
// Phase 188.1: Pattern 6 enum defined, but detection logic is STUB
|
||||
// Currently always returns max_loop_depth = 1 (default)
|
||||
// because LoopForm has NO nesting information.
|
||||
//
|
||||
// TODO (Phase 188.2): Integrate StepTreeFeatures or LoopRegion
|
||||
// to enable actual nesting detection.
|
||||
if features.max_loop_depth == 2
|
||||
&& features.has_inner_loops
|
||||
&& !features.has_break
|
||||
&& !features.has_continue
|
||||
{
|
||||
return LoopPatternKind::Pattern6NestedLoopMinimal; // Never reached (stub)
|
||||
}
|
||||
```
|
||||
|
||||
5. **Pattern → Lowering** (`loop_pattern_router.rs`):
|
||||
```rust
|
||||
LoopPatternKind::Pattern6NestedLoopMinimal => {
|
||||
super::loop_patterns::lower_nested_loop_minimal_to_joinir(loop_form, lowerer)
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Success Criteria
|
||||
|
||||
### Functional Requirements
|
||||
|
||||
- ✅ `selfhost_minimal.sh`: Remove conditional SKIP, test PASS (or explicit error)
|
||||
- ✅ `integration --filter "selfhost_"`: FAIL=0 maintained
|
||||
- ✅ `quick`: 154/154 PASS unchanged
|
||||
|
||||
### Quality Requirements
|
||||
|
||||
- ✅ Explicit errors for unsupported forms (no silent `Ok(None)`)
|
||||
- ✅ Phase 286 Fail-Fast principle maintained (no silent fallback)
|
||||
- ✅ Minimal diff (~180 lines total)
|
||||
|
||||
---
|
||||
|
||||
## Out of Scope (Future Work)
|
||||
|
||||
**Deferred to Phase 188.2+**:
|
||||
- Pattern 6 の実装（ネスト検出のSSOT決定 + lowering 実装）
|
||||
- break/continue in nested loops (Pattern 2/4 inner/outer combinations)
|
||||
- Multiple inner loops (siblings)
|
||||
- 2+ level nesting (3+ loop depth)
|
||||
- Nested loops with PHI (Pattern 3 inner/outer combinations)
|
||||
- Shared carriers between outer/inner loops
|
||||
|
||||
**Rationale**: Phase 188.1 is minimal PoC to unblock selfhost_minimal. Complex patterns deferred to avoid scope creep.
|
||||
|
||||
---
|
||||
|
||||
## References
|
||||
|
||||
- **Phase 188 Overview**: `docs/private/roadmap2/phases/phase-188-joinir-loop-pattern-expansion/README.md`
|
||||
- **Pattern Classification**: `docs/private/roadmap2/phases/phase-188-joinir-loop-pattern-expansion/pattern-classification.md`
|
||||
- **JoinIR Architecture**: `docs/development/current/main/joinir-architecture-overview.md`
|
||||
- **Selfhost Integration Limitations**: `docs/development/current/main/investigations/selfhost-integration-limitations.md`
|
||||
|
||||
---
|
||||
|
||||
## End of Phase 188.1 Documentation
|
||||
|
||||
**Status**: Infrastructure complete, detection logic deferred to Phase 188.2
|
||||
**Reality**: Pattern 6 enum exists, but automatic detection is NOT implemented (LoopForm limitation)
|
||||
**Total Estimated Effort**: 4-5 hours (infrastructure only)
|
||||
**Date Completed**: 2025-12-27
|
||||
133
docs/development/current/main/phases/phase-188.2/README.md
Normal file
133
docs/development/current/main/phases/phase-188.2/README.md
Normal file
@ -0,0 +1,133 @@
|
||||
# Phase 188.2: StepTree nesting depth SSOT (Option A) — strict Fail-Fast
|
||||
|
||||
**Date**: 2025-12-27
|
||||
**Status**: ✅ Option A implemented / ❌ Pattern 6 lowering deferred (Phase 188.3+)
|
||||
**Goal**: `StepTreeFeatures.max_loop_depth` を SSOT として、strict mode で depth > 2 を明示エラーにする
|
||||
|
||||
---
|
||||
|
||||
## ✅ Decision: Option A Adopted (2025-12-27)
|
||||
|
||||
**Chosen Approach**: StepTreeFeatures Integration
|
||||
|
||||
**What Phase 188.2 Implements**:
|
||||
- Use `StepTree.features.max_loop_depth` as SSOT for nesting depth
|
||||
- Add explicit error for `max_loop_depth > 2` in strict mode (capability_guard.rs)
|
||||
- Update NestedLoop capability hint to reflect current support
|
||||
|
||||
**Implementation Location**:
|
||||
- `src/mir/builder/control_flow/joinir/control_tree_capability_guard.rs` (lines 32-76)
|
||||
|
||||
**Status**: Option A depth checking implemented, Option B deferred
|
||||
|
||||
---
|
||||
|
||||
## What Phase 188.2 delivered
|
||||
|
||||
- ✅ strict mode の depth 制約を SSOT 化（`max_loop_depth > 2` は明示エラー）
|
||||
- ✅ NestedLoop capability hint を現実に合わせて更新（1-levelは許可、2+ level は depth_exceeded）
|
||||
- ✅ unit tests 更新（depth=2 PASS / depth=3 FAIL）
|
||||
- ✅ quick/integration は不変（回帰なし）
|
||||
|
||||
### Verification (reference)
|
||||
|
||||
- quick: `./tools/smokes/v2/run.sh --profile quick`
|
||||
- integration selfhost: `./tools/smokes/v2/run.sh --profile integration --filter "selfhost_"`
|
||||
|
||||
---
|
||||
|
||||
## Background
|
||||
|
||||
Phase 188.1 delivered infrastructure (capability allowlist, enum, stub module), but **detection and lowering are NOT implemented** due to architectural limitations.
|
||||
|
||||
**See**: `docs/development/current/main/phases/phase-188.1/README.md` § Implementation Reality
|
||||
|
||||
---
|
||||
|
||||
## Design Decision Required (Choose A or B)
|
||||
|
||||
### Option A: StepTreeFeatures Integration
|
||||
|
||||
**Approach**:
|
||||
- Pass `StepTreeFeatures` from StepTree to LoopForm creation
|
||||
- Store `max_loop_depth` in LoopForm (add field) or pass via context
|
||||
- Use AST-level nesting depth for Pattern 6 detection
|
||||
|
||||
**Pros**:
|
||||
- Nesting info already exists in StepTree
|
||||
- No new detection logic required
|
||||
- Fast implementation
|
||||
|
||||
**Cons**:
|
||||
- AST-level info may diverge from MIR structure (after optimizations)
|
||||
- Adding fields to LoopForm breaks separation of concerns
|
||||
|
||||
**Estimated Effort**: 1-2 days
|
||||
|
||||
---
|
||||
|
||||
### Option B: LoopRegion Integration
|
||||
|
||||
**Approach**:
|
||||
- Implement LoopRegion builder (instantiate parent/child structure)
|
||||
- Build LoopRegion tree from MIR control flow graph
|
||||
- Compute nesting depth from LoopRegion.parent traversal
|
||||
- Replace LoopForm with LoopRegion in lowering pipeline
|
||||
|
||||
**Pros**:
|
||||
- MIR-level truth (accurate after optimizations)
|
||||
- Leverages Phase 32 infrastructure
|
||||
- Clean separation (LoopRegion is designed for nesting)
|
||||
|
||||
**Cons**:
|
||||
- Requires implementing LoopRegion builder (non-trivial)
|
||||
- Larger architectural change
|
||||
- May affect other loop analysis code
|
||||
|
||||
**Estimated Effort**: 1-2 weeks
|
||||
|
||||
---
|
||||
|
||||
## Planning Session Agenda
|
||||
|
||||
**Step 1: Docs-First Design Review**
|
||||
- Review Option A vs B trade-offs
|
||||
- Consider impact on selfhost_minimal requirements
|
||||
- Decide on approach based on scope/timeline
|
||||
|
||||
**Step 2: Detailed Implementation Plan**
|
||||
- Write step-by-step implementation guide
|
||||
- Identify critical files
|
||||
- Estimate effort per task
|
||||
|
||||
**Step 3: Implementation**
|
||||
- Execute chosen approach
|
||||
- Test with selfhost_minimal
|
||||
- Verify 154/154 PASS maintained
|
||||
|
||||
---
|
||||
|
||||
## Out of Scope (Phase 188.2)
|
||||
|
||||
Still deferred to Phase 188.3+:
|
||||
- Break/continue in nested loops (Pattern 2/4 combinations)
|
||||
- Multiple inner loops (siblings)
|
||||
- 2+ level nesting (depth > 2) の lowering（Phase 188.2 は strict Fail-Fast のみ）
|
||||
|
||||
**Rationale**: Phase 188.2 focuses on 1-level nesting detection only (minimal scope).
|
||||
|
||||
---
|
||||
|
||||
## References
|
||||
|
||||
- **Phase 188.1 Reality**: `docs/development/current/main/phases/phase-188.1/README.md` § Implementation Reality
|
||||
- **LoopRegion Definition**: `src/mir/control_form.rs` (lines 40-62)
|
||||
- **StepTreeFeatures Definition**: `src/mir/control_tree/step_tree.rs` (lines 17-25)
|
||||
- **LoopForm/LoopShape Definition**: `src/mir/loop_form.rs`, `src/mir/control_form.rs`
|
||||
|
||||
---
|
||||
|
||||
## End of Phase 188.2 Planning Stub
|
||||
|
||||
**Status**: Option A is complete; remaining work is Phase 188.3+
|
||||
**Dependencies**: Phase 188.1 “Implementation Reality” remains SSOT
|
||||
104
docs/development/current/main/phases/phase-188.3/README.md
Normal file
104
docs/development/current/main/phases/phase-188.3/README.md
Normal file
@ -0,0 +1,104 @@
|
||||
# Phase 188.3: Nested loop lowering (1-level) — make Pattern 6 real
|
||||
|
||||
**Date**: TBD
|
||||
**Status**: Planning (docs-first)
|
||||
**Prereq**: Phase 188.2 Option A is complete (StepTree depth SSOT + strict Fail-Fast)
|
||||
|
||||
---
|
||||
|
||||
## Goal
|
||||
|
||||
`max_loop_depth == 2`（1-level nested loop）を **JoinIR lowering で実際に通す**。
|
||||
|
||||
- 既知の事実: `LoopForm (=LoopShape)` にはネスト情報が無いので、**LoopFormベースの Pattern6 検出/ルーティングでは実装できない**
|
||||
- 実装は **StepTree（AST側）**を SSOT として扱う（Phase 188.2 Option A を継続）
|
||||
|
||||
---
|
||||
|
||||
## Scope (minimal)
|
||||
|
||||
対応するのは “NestedLoop Minimal” の 1形だけに限定する。
|
||||
|
||||
- depth: `max_loop_depth == 2` のみ
|
||||
- inner loop: Pattern1相当（break/continue 無し）
|
||||
- outer loop: Pattern1相当（break/continue 無し）を優先
|
||||
- それ以外:
|
||||
- strict mode: 明示エラー（Phase 188.2 の depth check とは別タグで良い）
|
||||
- non-strict mode: 既存の fallback 経路に任せる（ただし silent fallback を増やさない）
|
||||
|
||||
---
|
||||
|
||||
## SSOT (what to rely on)
|
||||
|
||||
- nesting depth SSOT: `StepTreeFeatures.max_loop_depth`
|
||||
- depth > 2: strict mode で `control_tree/nested_loop/depth_exceeded`（Phase 188.2）
|
||||
|
||||
---
|
||||
|
||||
## Scope & Variable Model (SSOT)
|
||||
|
||||
Nyash の変数スコープ方針に合わせて、nested loop lowering でも以下を SSOT として固定する。
|
||||
|
||||
### Visibility (read)
|
||||
|
||||
- inner loop から outer の binding は参照できる（lexical scope: “1つ上は見える”）
|
||||
- ただし JoinIR lowering では「見える」を **明示的な引数/継続で表現**する（暗黙キャプチャを増やさない）
|
||||
|
||||
### Mutation (write-back)
|
||||
|
||||
Phase 188.3 では段階的に進める：
|
||||
|
||||
- **P188.3 (minimal)**: outer 変数の **read-only capture** を許す（inner から outer を読む）
|
||||
- **P188.4+ (generalize)**: outer 変数の **write-back** を対応する（inner で outer に代入した値を `k_inner_exit(...)` で戻す）
|
||||
|
||||
この分離により、PHI/exit binding の複雑さを Phase 188.3 に持ち込まずに済む。
|
||||
|
||||
---
|
||||
|
||||
## Lowering sketch (how it should look)
|
||||
|
||||
Nested loop は JoinIR の「tail recursion + continuation」を再帰的に合成して表現する。
|
||||
|
||||
- outer: `outer_step(state..., k_outer_exit)`
|
||||
- inner: `inner_step(state..., k_inner_exit)`
|
||||
- inner が終わったら `k_inner_exit(...)` で outer の“残り”へ戻る
|
||||
|
||||
この `k_inner_exit` がスコープ境界として働くので、将来の write-back もここに集約できる。
|
||||
|
||||
---
|
||||
|
||||
## Deliverables
|
||||
|
||||
1. **Fixture + integration smoke（exit code SSOT）**
|
||||
- 1-level nested loop を最小で再現する `.hako` を追加
|
||||
- integration で実行し、exit code で判定（stdout比較はしない）
|
||||
|
||||
2. **StepTree-based lowering implementation**
|
||||
- StepTree を辿って、inner loop を outer loop の中で正しく lowering できるようにする
|
||||
- 入口は “StepTree→JoinIR” のどこか（LoopFormベースの router は使わない）
|
||||
|
||||
3. **Docs update**
|
||||
- Phase 188.1 の “Pattern6 specification” が design であることは維持
|
||||
- Phase 188.3 で “実装済み/未実装の境界” を明確に書く
|
||||
|
||||
---
|
||||
|
||||
## Acceptance Criteria
|
||||
|
||||
- `./tools/smokes/v2/run.sh --profile quick` が常にグリーン維持
|
||||
- integration selfhost が FAIL=0 を維持
|
||||
- 追加した nested loop fixture が PASS（JoinIR lowering が使われたことをログ/タグで確認可能）
|
||||
|
||||
---
|
||||
|
||||
## Next (schedule)
|
||||
|
||||
- **Phase 188.3**: depth=2 の最小形を “確実に通す” + PoC fixture を smoke 固定
|
||||
- **Phase 188.4+**: write-back（outer carrier reconnection）と “再帰 lowering の一般化（depthを増やしても壊れない）” を docs-first で設計してから実装
|
||||
|
||||
---
|
||||
|
||||
## Out of Scope
|
||||
|
||||
- nested loop + break/continue の一般対応
|
||||
- LoopRegion を使った MIR-level nesting SSOT（Option B）
|
||||
Reference in New Issue
Block a user