feat(normalization): Phase 142 P0 - Loop statement-level normalization
Phase 142-loopstmt P0: Statement-level normalization 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
This commit is contained in:
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## 現在の Phase
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- **Phase 132**: Exit Values Parity (VM == LLVM)
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- **Phase 133**: Promoted carrier join_id（Trim）修正
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- **Phase 134**: Plugin loader best-effort loading
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- **Phase 135**: ConditionLoweringBox allocator SSOT（ValueId 衝突の根治）
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- **Phase 136**: MirBuilder Context SSOT 化（+ ValueId allocator 掃討）
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- **Phase 137–141**: Loop Canonicalizer（前処理 SSOT）導入（Phase 137 フォルダに統合して記録）
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- **Phase 139（DONE）**: post-if `post_k` の return lowering を `ReturnValueLowererBox` に統一（出口 SSOT 完成）
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- **Phase 140（DONE）**: `NormalizedExprLowererBox` 初版（pure expression のみ）
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- **Phase 141 P0（DONE）**: impure 拡張点（contract）を SSOT 化（Call/MethodCall はまだ out-of-scope）
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- **Phase 141 P1（DONE）**: “既知 intrinsic だけ” を許可して段階投入（length0）
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- **Phase 141 P1.5（DONE）**: known intrinsic registry + available_inputs 3-source merge + diagnostics
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- **Phase 141 P2+（planned）**: Call/MethodCall 対応（effects + typing の段階投入）
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- **Phase 142-loopstmt P0（DONE）**: 正規化単位を statement（loop 1個）へ寄せる（パターン爆発を止める）
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- **Phase 142-loopstmt P1（planned）**: LLVM EXE smoke（同 fixture）を追加
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- **Phase 143-loopvocab（planned）**: StepTree の語彙拡張（loop 内 if/break/continue を「語彙追加」で吸収）
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- **Phase 91–92**: Selfhost depth‑2 coverage（P5b escape recognition → lowering）
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- **Phase 94–100**: P5b escape E2E / Trim policy / pinned + accumulator（VM/LLVM EXE parity）
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- **Phase 102**: real-app read_quoted loop regression（VM + LLVM EXE）
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@ -52,4 +55,4 @@ phases/phase-131/
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---
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**最終更新**: 2025-12-18
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**最終更新**: 2025-12-19
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46
docs/development/current/main/phases/phase-139/README.md
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46
docs/development/current/main/phases/phase-139/README.md
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# Phase 139: post-if `post_k` Return Lowering Unification
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Status: DONE ✅
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Scope: if-only `post_if_post_k.rs` の return lowering を `ReturnValueLowererBox` に統一し、loop/if の出口 SSOT を完成させる。
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Related:
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- `docs/development/current/main/10-Now.md`
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- `docs/development/current/main/30-Backlog.md`
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- `docs/development/current/main/phases/phase-138/README.md`
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- `src/mir/control_tree/normalized_shadow/post_if_post_k.rs`
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- `src/mir/control_tree/normalized_shadow/common/return_value_lowerer_box.rs`
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---
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## Goal
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- if-only `post_k` 内の return を `ReturnValueLowererBox` に委譲し、return の仕様を 1 箇所へ集約する。
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- out-of-scope は `Ok(None)` で既存経路へフォールバック（既定挙動不変）。
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## Non-Goals
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- Assign lowering の共通化（return のみ対象）
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- ExprLowerer の一般化（Phase 140）
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- Call/MethodCall（Phase 141+）
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## Plan
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1. `post_if_post_k.rs` の return lowering を `ReturnValueLowererBox::lower_to_value_id()` 呼び出しへ置換（DONE）
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2. return の重複ロジック削除（変数 lookup / const emission / add emission）（DONE）
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3. fixture + smoke を追加して VM/LLVM EXE parity で固定（DONE）
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## Tests
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- Fixture:
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- `apps/tests/phase139_if_only_post_k_return_add_min.hako`（expected exit code 4）
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- Smokes:
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- `tools/smokes/v2/profiles/integration/apps/phase139_if_only_post_k_return_add_vm.sh`
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- `tools/smokes/v2/profiles/integration/apps/phase139_if_only_post_k_return_add_llvm_exe.sh`
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- regressions:
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- Phase 136/137/138（return 系）
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- Phase 97（loop(i<n) フォールバック確認）
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## Acceptance
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- `post_if_post_k.rs` の return lowering が `ReturnValueLowererBox` に一本化されている
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- 既存の挙動を壊さない（dev-only、既定挙動不変）
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- VM/LLVM EXE parity を fixture/smoke で固定
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62
docs/development/current/main/phases/phase-140/README.md
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docs/development/current/main/phases/phase-140/README.md
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# Phase 140: NormalizedExprLowererBox (pure expressions)
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Status: DONE ✅
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Scope: Normalized shadow の expression lowering を AST walker で一般化し、パターン爆発を避ける（pure のみ）。
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Related:
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- `docs/development/current/main/design/normalized-expr-lowering.md`
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- `docs/development/current/main/30-Backlog.md`
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- `docs/development/current/main/phases/phase-139/README.md`
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- `src/mir/control_tree/normalized_shadow/common/expr_lowerer_box.rs`
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- `src/mir/control_tree/normalized_shadow/common/return_value_lowerer_box.rs`
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---
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## Goal
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- `NormalizedExprLowererBox` を導入し、pure expression を JoinIR（Normalized dialect）へ lowering できるようにする。
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- return lowering は `ReturnValueLowererBox` → `ExprLowererBox` 委譲へ寄せ、return の形追加を “総当たり” にしない。
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## Scope (Phase 140 P0)
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### ✅ In scope: pure expression
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- `Variable`
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- `Literal`（Integer/Bool から開始）
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- `UnaryOp`（not, -）
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- `BinaryOp`（+ - * /）
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- `Compare`（==, <, <=, >, >=）
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### ❌ Out of scope
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- Call/MethodCall（Phase 141+）
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- Short-circuit（&&/||）の制御フローを伴う lowering
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- 例外/throw/try/catch
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- NormalizationPlan の粒度変更（suffix→statement などの再設計は Phase 141+ の検討に回す）
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## Contract
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`NormalizedExprLowererBox::lower_expr(...) -> Result<Option<ValueId>, String>`
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- `Ok(Some(vid))`: lowering 成功
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- `Ok(None)`: out-of-scope（既存経路へフォールバック、既定挙動不変）
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- `Err(_)`: 内部不整合のみ（strict では fail-fast）
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## Implementation Notes
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- 既存の `ReturnValueLowererBox` は “return 構文” の薄い箱に縮退し、expr lowering の実体は `ExprLowererBox` に置く。
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- 型は過剰に推論しない。Const/Compare/BinOp の最小ヒントのみ（必要なら段階投入）。
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## Tests
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- Unit tests:
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- `cargo test -p nyash-rust --lib mir::control_tree::normalized_shadow::common`
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- Smokes (regressions):
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- Phase 139（VM/LLVM EXE）
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- Phase 136/137/138（return 系）
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- Phase 97（フォールバック）
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## Implementation (DONE)
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- Added pure expression SSOT: `src/mir/control_tree/normalized_shadow/common/expr_lowerer_box.rs`
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- `ReturnValueLowererBox` shrunk to return-syntax only and delegates to `NormalizedExprLowererBox`
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- Explicitly keeps out-of-scope = `Ok(None)` (fallback) and avoids fail-fast expansion
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89
docs/development/current/main/phases/phase-141/README.md
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docs/development/current/main/phases/phase-141/README.md
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# Phase 141: Impure Extension Contract → P1 Known Intrinsic (incremental)
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Status: DONE ✅
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Scope: `NormalizedExprLowererBox` の pure/impure 境界を contract（SSOT）として型で固定し、Call/MethodCall を段階投入できる形へ収束させる。
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Related:
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- `docs/development/current/main/design/normalized-expr-lowering.md`
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- `docs/development/current/main/phases/phase-140/README.md`
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- `src/mir/control_tree/normalized_shadow/common/expr_lowering_contract.rs`
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- `src/mir/control_tree/normalized_shadow/common/expr_lowerer_box.rs`
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---
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## Goal
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- ExprLowerer が “pure only” のままでも、impure（Call/MethodCall）導入の拡張点（契約）を SSOT 化する。
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- P0 は contract のみ（Call/MethodCall を lowering しない、既定挙動不変）。
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- P1 は “既知 intrinsic だけ” を許可し、impure 導入の第一歩を作る（それ以外は既定挙動不変）。
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## Non-Goals (P0)
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- Call/MethodCall の lowering（ValueId生成、effects、receiver materialization）
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- impure式の順序付け（effects ordering）
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- 型解決（dispatch/overload）
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## SSOT
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- Contract: `src/mir/control_tree/normalized_shadow/common/expr_lowering_contract.rs`
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- `ExprLoweringScope::{PureOnly, WithImpure(..)}`
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- Phase 141 P1: `ImpurePolicy::KnownIntrinsicOnly`, `KnownIntrinsic::{Length0}`
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- `OutOfScopeReason`（Call/MethodCall 等の最小理由）
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- ExprLowerer API: `src/mir/control_tree/normalized_shadow/common/expr_lowerer_box.rs`
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- `lower_expr_with_scope(scope, ...)` を追加
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- 既存 `lower_expr(...)` は `PureOnly` の thin wrapper（挙動不変）
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- Return lowering entry: `src/mir/control_tree/normalized_shadow/common/return_value_lowerer_box.rs`
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- Phase 141 P1: return lowering は `WithImpure(KnownIntrinsicOnly)` を使う（既知 intrinsic のみ許可）
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## Tests
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- Unit: `cargo test -p nyash-rust --lib mir::control_tree::normalized_shadow::common`
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- Added minimal contract tests:
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- `call_is_out_of_scope_in_pure_only`
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- `methodcall_is_out_of_scope_in_pure_only`
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- `methodcall_length0_is_in_scope_with_known_intrinsic_only`
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- `lower_methodcall_length0_emits_method_call_inst`
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## Phase 141 P1: KnownIntrinsicOnly (Length0)
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### Scope
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- `ExprLoweringScope::WithImpure(ImpurePolicy::KnownIntrinsicOnly)` のときのみ、以下を lowering する:
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- `receiver.length()`（引数 0、receiver は env に存在する Variable のみ）
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- それ以外の Call/MethodCall は out-of-scope (`Ok(None)`) のまま（既定挙動不変）。
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### Fixture / Smoke
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- Fixture: `apps/tests/phase141_p1_if_only_post_k_return_length_min.hako`（expected exit code 3）
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- Smoke tests:
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- VM: `tools/smokes/v2/profiles/integration/apps/phase141_p1_if_only_post_k_return_length_vm.sh`
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- LLVM EXE: `tools/smokes/v2/profiles/integration/apps/phase141_p1_if_only_post_k_return_length_llvm_exe.sh`
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## Phase 141 P1.5: SSOT Reinforcement (Registry + available_inputs + diagnostics)
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### Task A: KnownIntrinsic SSOT (Registry)
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- 目的: intrinsic の metadata（method 名/arity/type_hint）を 1 箇所に集約し、文字列直書きの散らばりを止める。
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- SSOT:
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- `src/mir/control_tree/normalized_shadow/common/known_intrinsics.rs`
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- `KnownIntrinsicRegistryBox::{lookup,get_spec}`
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- 効果:
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- `expr_lowerer_box.rs` の by-name 判定が “registry lookup” に収束
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### Task B: available_inputs 3-source merge (Bug fix)
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- 目的: suffix 正規化が prefix 側で生成された locals（`local s; s="..."`）を見失わないようにする。
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- 変更:
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- `AvailableInputsCollectorBox::collect(builder, captured_env, prefix_variables)` を追加
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- 優先順位: Function params > Prefix variables > CapturedEnv
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- Call sites:
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- `src/mir/builder/control_flow/normalization/execute_box.rs`
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- `src/mir/builder/control_flow/joinir/patterns/policies/normalized_shadow_suffix_router_box.rs`
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### Task C: Diagnostics
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- 追加: `OutOfScopeReason::IntrinsicNotWhitelisted`
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- “methodcall だが known intrinsic allowlist 外” を区別できるようにする
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## Next
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- Phase 141 P2+: 一般 Call/MethodCall（effects + typing を分離して拡張）
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@ -0,0 +1,351 @@
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# Phase 142-loopstmt: Statement-Level Loop Normalization
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Status: ✅ P0 Complete
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Date: 2025-12-19
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---
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## 目的（Why）
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Phase 131-141 で loop(true) 系の Normalized shadow を段階的に拡張したが、「block suffix (loop + post assigns + return)」の直積パターン増殖を止める必要があった。
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**Phase 142-loopstmt** では、正規化単位を **"block suffix" から "statement (loop 1個)" へ寄せる** ことで、パターン爆発を防ぐ。
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### Non-Goal
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- ⚠️ **Phase 142 (Canonicalizer Pattern Extension) とは別物**
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- Phase 142 = trim leading/trailing, continue pattern (Canonicalizer)
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- Phase 142-loopstmt = Statement-level normalization (Normalized shadow)
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- SSOT 衝突回避のため phase-142-loopstmt として独立管理
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---
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## P0: Statement-Level Normalization (COMPLETE ✅)
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### Summary
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Normalization unit changed from "block suffix (loop + post + return)" to "statement (loop only)".
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### Implementation
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#### 1. PlanBox の挙動変更
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**File**: `src/mir/builder/control_flow/normalization/plan_box.rs`
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**Before**:
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- `loop(true)` の後ろに return が無いと plan が None になりやすい
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- LoopWithPost pattern を返す（loop + post assigns + return を一括消費）
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**After**:
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- `remaining[0]` が `loop(true)` なら 常に `NormalizationPlan::loop_only()` を返す
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- **consumed = 1** (loop のみ)
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- 後続文（return/assign 等）は通常 MIR lowering へ戻す
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**Code changes**:
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```rust
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// Phase 142-loopstmt P0: Always return loop_only for loop(true)
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// Normalization unit is now "statement (loop 1個)" not "block suffix"
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// Subsequent statements handled by normal MIR lowering
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if debug {
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trace.routing(
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"normalization/plan",
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func_name,
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"Detected loop(true) - Phase 142-loopstmt P0: returning loop_only (consumed=1)",
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);
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}
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Ok(Some(NormalizationPlan::loop_only()))
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```
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**Impact**: ~70 lines reduced
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#### 2. SuffixRouter の LoopOnly 対応
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**File**: `src/mir/builder/control_flow/joinir/patterns/policies/normalized_shadow_suffix_router_box.rs`
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**Before**: Lines 64-75 で PlanKind::LoopOnly を reject ("not a suffix")
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**After**: LoopOnly も受け入れて execute_box に渡す
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**Code changes**:
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```rust
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// Phase 142-loopstmt P0: Accept both LoopOnly and LoopWithPost
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// Normalization unit is now "statement (loop 1個)", not "block suffix"
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if debug {
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let description = match &plan.kind {
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PlanKind::LoopOnly => "Loop-only pattern".to_string(),
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PlanKind::LoopWithPost { post_assign_count } => {
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format!("Loop+post pattern: {} post assigns", post_assign_count)
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}
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};
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trace.routing("suffix_router", func_name, &description);
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}
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```
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**Impact**: ~12 lines reduced
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#### 3. build_block で consumed 後の break 削除
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**File**: `src/mir/builder/stmts.rs`
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**Before**:
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- suffix_router が Some(consumed) を返したら break
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- return statement が消費されたと仮定
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**After**:
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- consumed 後も `idx += consumed` でスキップし、後続文を通常処理
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- Phase 142-loopstmt では loop 正規化後も `return s.length()` 等が残る
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**Code changes**:
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```rust
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Some(consumed) => {
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trace.emit_if(
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"debug",
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"build_block/suffix_router",
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&format!("Phase 142-loopstmt P0: Suffix router consumed {} statement(s), continuing to process subsequent statements", consumed),
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debug,
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);
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// Phase 142-loopstmt P0: Normalization unit is now "statement (loop 1個)"
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// Loop normalization returns consumed=1, and subsequent statements
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// (return, assignments, etc.) are handled by normal MIR lowering
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idx += consumed;
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// No break - continue processing subsequent statements
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}
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```
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### Unit Tests
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**File**: `src/mir/builder/control_flow/normalization/plan_box.rs`
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**Updated tests** (7 tests total):
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- `test_plan_block_suffix_phase131_loop_only()` - unchanged
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- `test_plan_block_suffix_phase142_loop_with_subsequent_stmts()` - was phase132, now expects LoopOnly
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- `test_plan_block_suffix_phase142_loop_only_always()` - was phase133, now expects LoopOnly
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- `test_plan_block_suffix_phase142_loop_with_trailing_stmt()` - new, no return but still LoopOnly
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- `test_plan_block_suffix_no_match_empty()` - unchanged
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- `test_plan_block_suffix_no_match_not_loop()` - unchanged
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- `test_plan_block_suffix_no_match_loop_not_true()` - unchanged
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**Results**: ✅ 7/7 passed
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### E2E Tests
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#### Fixture
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||||
**File**: `apps/tests/phase142_loop_stmt_only_then_return_length_min.hako`
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|
||||
```hako
|
||||
static box Main {
|
||||
main() {
|
||||
local s
|
||||
s = "abc"
|
||||
loop(true) {
|
||||
break
|
||||
}
|
||||
return s.length()
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**Expected**: exit code 3 (s="abc" → s.length() → 3)
|
||||
|
||||
#### VM Smoke Test
|
||||
|
||||
**File**: `tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_vm.sh`
|
||||
|
||||
**Command**:
|
||||
```bash
|
||||
bash tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_vm.sh
|
||||
```
|
||||
|
||||
**Result**: ✅ PASS (exit code 3)
|
||||
|
||||
#### LLVM EXE Smoke Test
|
||||
|
||||
**File**: `tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh`
|
||||
|
||||
**Status**: ⚠️ TODO in P1 (requires Phase 130 LLVM EXE gate complete)
|
||||
|
||||
---
|
||||
|
||||
## Refactoring (COMPLETE ✅)
|
||||
|
||||
### Task 1: suffix_router コメント更新
|
||||
|
||||
**Commit**: `21a3c6b5d` - "docs(normalization): Update suffix_router comments for Phase 142-loopstmt P0"
|
||||
|
||||
**Changes**:
|
||||
- Updated header comments to reflect post statements no longer required
|
||||
- Documented LoopOnly pattern acceptance
|
||||
|
||||
### Task 2: LoopWithPost Deprecation
|
||||
|
||||
**Commit**: `aaba27d31` - "refactor(normalization): Deprecate LoopWithPost variant"
|
||||
|
||||
**Changes**:
|
||||
- Added `#[deprecated]` to `PlanKind::LoopWithPost` enum variant
|
||||
- Added deprecation to `loop_with_post()` constructor function
|
||||
- Documented migration path to LoopOnly
|
||||
- Kept for backward compatibility
|
||||
|
||||
**Deprecation warnings** (4 locations):
|
||||
- `normalized_shadow_suffix_router_box.rs:69`
|
||||
- `routing.rs:457`
|
||||
- `plan.rs:74`
|
||||
- `execute_box.rs:66`
|
||||
|
||||
### Task 3: README 更新
|
||||
|
||||
**Commit**: `3ef929df5` - "docs(normalization): Update README for Phase 142-loopstmt P0"
|
||||
|
||||
**Changes**:
|
||||
- Added Phase 142-loopstmt P0 section
|
||||
- Marked Phase 132-135 as LEGACY
|
||||
- Updated suffix_router description
|
||||
|
||||
---
|
||||
|
||||
## Acceptance Criteria (All Met ✅)
|
||||
|
||||
- [x] PlanBox が loop(true) に対して常に loop_only を返す（consumed=1）
|
||||
- [x] SuffixRouter が LoopOnly を受け入れて実行する
|
||||
- [x] build_block が consumed 後も後続文を処理する
|
||||
- [x] Fixture が exit code 3 を返す（VM）
|
||||
- [x] 既存 smokes が緑（Phase 97/131/136/137/139/141）
|
||||
- Phase 131 VM: ✅ PASS
|
||||
- Normalization unit tests: ✅ 10 passed
|
||||
- [x] Out-of-scope は常に Ok(None) でフォールバック（既定挙動不変）
|
||||
- [x] Documentation 作成
|
||||
- [x] Refactoring tasks 完了（3 commits）
|
||||
- [x] Main implementation commit
|
||||
|
||||
---
|
||||
|
||||
## Design Principles
|
||||
|
||||
### Pattern Explosion Prevention
|
||||
|
||||
- **制御フローの骨格（loop/if/post_k/continuation）**: 正規化（段階投入）で固める
|
||||
- **式（return value を含む）**: 一般化（AST walker）で受ける（Phase 140+）
|
||||
|
||||
### Normalization Unit Evolution
|
||||
|
||||
**Phase 141 以前**:
|
||||
```
|
||||
NormalizationPlan::loop_with_post(n) → consumed = 1 + n + 1 (loop + assigns + return)
|
||||
```
|
||||
|
||||
**Phase 142-loopstmt P0**:
|
||||
```
|
||||
NormalizationPlan::loop_only() → consumed = 1 (loop のみ)
|
||||
後続文は通常 MIR lowering で処理
|
||||
```
|
||||
|
||||
### Fail-Fast Policy
|
||||
|
||||
- **Out-of-scope**: 常に `Ok(None)` でフォールバック（既定挙動不変）
|
||||
- **Fail-Fast**: "in-scope のはずなのに壊れた" ケースのみ（internal error）
|
||||
|
||||
---
|
||||
|
||||
## Files Modified
|
||||
|
||||
### Core Implementation
|
||||
|
||||
1. `src/mir/builder/control_flow/normalization/plan_box.rs`
|
||||
- Always return loop_only for loop(true)
|
||||
- 7 unit tests updated
|
||||
|
||||
2. `src/mir/builder/control_flow/joinir/patterns/policies/normalized_shadow_suffix_router_box.rs`
|
||||
- Accept LoopOnly patterns
|
||||
- Remove rejection logic
|
||||
|
||||
3. `src/mir/builder/stmts.rs`
|
||||
- Remove break after consumed
|
||||
- Continue processing subsequent statements
|
||||
|
||||
### Tests
|
||||
|
||||
4. `apps/tests/phase142_loop_stmt_only_then_return_length_min.hako` (NEW)
|
||||
5. `tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_vm.sh` (NEW)
|
||||
|
||||
### Documentation
|
||||
|
||||
6. `src/mir/builder/control_flow/normalization/plan.rs` (deprecation)
|
||||
7. `src/mir/builder/control_flow/normalization/README.md` (updated)
|
||||
|
||||
### Statistics
|
||||
|
||||
- **Total commits**: 4
|
||||
- **Files changed**: 7
|
||||
- **Net change**: -38 lines (削減成功！)
|
||||
- **Code reduction**: ~82 lines deleted (pattern detection logic)
|
||||
|
||||
---
|
||||
|
||||
## Verification Commands
|
||||
|
||||
### Unit Tests
|
||||
```bash
|
||||
cargo test -p nyash-rust --lib mir::builder::control_flow::normalization
|
||||
```
|
||||
|
||||
### Regression Tests
|
||||
```bash
|
||||
# Phase 131 regression
|
||||
bash tools/smokes/v2/profiles/integration/apps/phase131_loop_true_break_once_vm.sh
|
||||
|
||||
# Phase 141 regression
|
||||
bash tools/smokes/v2/profiles/integration/apps/phase141_p1_if_only_post_k_return_length_vm.sh
|
||||
|
||||
# Phase 142-loopstmt P0
|
||||
bash tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_vm.sh
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Next Steps
|
||||
|
||||
### P1: LLVM EXE Smoke Test (TODO)
|
||||
|
||||
**File**: `tools/smokes/v2/profiles/integration/apps/phase142_loop_stmt_only_then_return_length_min_llvm_exe.sh`
|
||||
|
||||
**Prerequisites**: Phase 130 LLVM EXE gate complete
|
||||
|
||||
**Expected**: exit code 3 parity with VM
|
||||
|
||||
### P2: Code Contract Enforcement (Planned)
|
||||
|
||||
**Goal**: Prevent future regression to pattern explosion
|
||||
|
||||
**Options**:
|
||||
- **Option A (Recommended)**: Remove LoopWithPost creation path entirely
|
||||
- **Option B**: Introduce Outcome { consumed, stop_block } SSOT
|
||||
|
||||
### Phase 143-loopvocab (Planned)
|
||||
|
||||
**Goal**: 「語彙追加」で `loop(true){ if(cond) break/continue }` を吸収
|
||||
|
||||
**Approach**:
|
||||
- Extend StepTree/ControlTree vocabulary (not new patterns)
|
||||
- Use NormalizedExprLowererBox for pure conditions
|
||||
- JoinIR Jump { cond: Some(vid) } for conditional exits
|
||||
|
||||
---
|
||||
|
||||
## Related Documentation
|
||||
|
||||
- [10-Now.md](../../10-Now.md) - Current progress
|
||||
- [30-Backlog.md](../../30-Backlog.md) - Future phases
|
||||
- [phase-143-loopvocab/README.md](../phase-143-loopvocab/README.md) - Next planned vocabulary expansion
|
||||
- [normalized-expr-lowering.md](../../design/normalized-expr-lowering.md) - Normalized design SSOT
|
||||
- [control-tree.md](../../design/control-tree.md) - ControlTree design
|
||||
- [normalization/README.md](../../../src/mir/builder/control_flow/normalization/README.md) - Architecture
|
||||
|
||||
---
|
||||
|
||||
## Commits
|
||||
|
||||
1. `21a3c6b5d` - docs(normalization): Update suffix_router comments for Phase 142-loopstmt P0
|
||||
2. `aaba27d31` - refactor(normalization): Deprecate LoopWithPost variant
|
||||
3. `3ef929df5` - docs(normalization): Update README for Phase 142-loopstmt P0
|
||||
4. `275fe45ba` - feat(normalization): Phase 142-loopstmt P0 - Statement-level normalization
|
||||
@ -0,0 +1,96 @@
|
||||
# Phase 143-loopvocab: StepTree Vocabulary Expansion (loop → if/break/continue)
|
||||
|
||||
Status: planned
|
||||
Scope: Normalized shadow / JoinIR（dev-only, default behavior unchanged）
|
||||
|
||||
Related (SSOT):
|
||||
- `docs/development/current/main/design/control-tree.md`
|
||||
- `docs/development/current/main/design/normalized-expr-lowering.md`
|
||||
- `docs/development/current/main/phases/phase-142-loopstmt/README.md`
|
||||
|
||||
---
|
||||
|
||||
## Goal
|
||||
|
||||
`loop(true){ if(cond) break/continue }` を「新パターン追加」ではなく、**StepTree/ControlTree の語彙（vocabulary）拡張**として表現し、同じ Normalized lowering（env + continuation）に流す。
|
||||
|
||||
つまり、suffix/fixture の形を増やすのではなく:
|
||||
|
||||
- **制御は構造（StepTree）**
|
||||
- **値は一般化（ExprLowererBox）**
|
||||
|
||||
で吸収する。
|
||||
|
||||
## Non-Goals
|
||||
|
||||
- `loop(<cond>)`（条件付き loop）を Normalized に入れる（既存経路へフォールバック維持）
|
||||
- impure expression（Call/MethodCall general case）を増やす（Phase 141 P2+ で扱う）
|
||||
- 既定挙動変更（out-of-scope は `Ok(None)` でフォールバック）
|
||||
|
||||
---
|
||||
|
||||
## P0 (planned): If-in-loop (single if, break/continue only)
|
||||
|
||||
### Accepted surface syntax (fixtures)
|
||||
|
||||
1) break:
|
||||
```hako
|
||||
loop(true) {
|
||||
if (cond) { break }
|
||||
}
|
||||
```
|
||||
|
||||
2) continue:
|
||||
```hako
|
||||
loop(true) {
|
||||
if (cond) { continue }
|
||||
}
|
||||
```
|
||||
|
||||
### StepTree vocabulary (existing)
|
||||
|
||||
StepTree は既に `StepNode::Loop` / `StepNode::If` / `StepStmtKind::{Break,Continue}` を持っている。
|
||||
|
||||
P0 の焦点は **Normalized lowering が Loop-body 内の If を受けられるようにする**こと。
|
||||
|
||||
### Capability / contract (Fail-Fast boundary)
|
||||
|
||||
- P0 で許可するのは「Loop-body の先頭/末尾に 1 個の If（else無しでも可）で、その then/else が Break/Continue のみ」まで。
|
||||
- それ以外（ネスト if、複数 if、then に Assign など）は out-of-scope (`Ok(None)`) にして既存経路へフォールバック。
|
||||
- strict/dev では `OutOfScopeReason` を必ず出す（silent accept 禁止）。
|
||||
|
||||
### Implementation sketch (boxes)
|
||||
|
||||
- `NormalizationPlanBox`:
|
||||
- `loop(true)` を見たら `loop_only(consumed=1)`（Phase 142-loopstmt と同じ）
|
||||
- 追加で「Loop-body が If を含むか」を feature として観測（plan の枝分かれは最小）
|
||||
- `NormalizationExecuteBox`:
|
||||
- `execute_loop_only` の内部で StepTree を作る
|
||||
- `StepTreeContractBox` で capability 判定（許可形なら Normalized lowering、不可なら `Ok(None)`）
|
||||
- Normalized lowering:
|
||||
- `if(cond){break}`: `cond_vid` を `ExprLowererBox`（pure only）で生成し、branch to `k_exit` / `loop_step` に落とす
|
||||
- `if(cond){continue}`: then -> tailcall `loop_step`, else -> fallthrough
|
||||
|
||||
### Fixtures / smokes
|
||||
|
||||
- VM + LLVM EXE parity を 1 本ずつ増やす（最小2本）
|
||||
- `apps/tests/phase143_loop_true_if_break_min.hako`
|
||||
- `apps/tests/phase143_loop_true_if_continue_min.hako`
|
||||
- Integration smokes:
|
||||
- `tools/smokes/v2/profiles/integration/apps/phase143_loop_true_if_break_vm.sh`
|
||||
- `tools/smokes/v2/profiles/integration/apps/phase143_loop_true_if_break_llvm_exe.sh`
|
||||
- `tools/smokes/v2/profiles/integration/apps/phase143_loop_true_if_continue_vm.sh`
|
||||
- `tools/smokes/v2/profiles/integration/apps/phase143_loop_true_if_continue_llvm_exe.sh`
|
||||
|
||||
### Acceptance criteria
|
||||
|
||||
- Phase 142-loopstmt の「statement-level normalization（consumed=1）」を維持し、suffix 形の増殖をさせない
|
||||
- out-of-scope は `Ok(None)` でフォールバック（既定挙動不変）
|
||||
- Unit tests が「許可形/不許可形」を contract として固定している（箱の責務が明確）
|
||||
|
||||
---
|
||||
|
||||
## Next
|
||||
|
||||
- P1: `if(cond) { break } else { continue }`（else branch を入れる）を vocabulary として追加
|
||||
- P2+: nested if / multi-if は capability guard で段階解禁（Phase 切りで SSOT 化）
|
||||
Reference in New Issue
Block a user