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## 🎉 ChatGPT×Claude協働成果 - ✅ **GC機能復活**: vm-legacy削除で失われたGC機能を新実装で復活 - GCメトリクス追跡システム実装（alloc/collect/pause計測） - 3種類のGCモード対応（counting/mark_sweep/generational） - host_handles.rsでハンドル管理復活 - ✅ **VM整理とエイリアス追加**: 混乱していた名前を整理 - MirInterpreter = NyashVm = VM のエイリアス統一 - vm-legacyとインタープリターの違いを明確化 - 壊れていたvm.rsの互換性修復 - ✅ **スモークテスト整理**: v2構造でプラグイン/コア分離 - plugins/ディレクトリにプラグインテスト移動 - gc_metrics.sh, gc_mode_off.sh, async_await.sh追加 - _ensure_fixture.shでプラグイン事前ビルド確認 ## 📊 json_native調査結果 - **現状**: 25%完成（配列/オブジェクトパース未実装） - **将来性**: 並行処理でyyjson超えの可能性大 - 100KB以上のJSONで2-10倍速の可能性 - Nyash ABI実装後はゼロコピー最適化 - **判断**: 現時点では置換不可、将来の大きな足場 ## 🔍 技術的発見 - vm-legacy = 完全なVM実装（GC付き）だった - MirInterpreter = 現在のRust VM（712行、Arc使用） - 200行簡易JSONは既に削除済み（存在しない） ChatGPT爆速修復×Claude詳細調査の完璧な協働！ 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
48 lines
2.8 KiB
Markdown
48 lines
2.8 KiB
Markdown
MIR13 Mode (legacy PHI-off fallback)
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Overview
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- Goal: Retain the Phase‑14 edge-copy compatibility path for debugging historical MIR dumps or diagnosing SSA regressions.
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- Default: MIR14 (PHI-on) now ships as the standard. MIR13 must be explicitly enabled through environment flags.
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Why keep MIR13 around?
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- Reproducibility: Some archived JSON v0 fixtures were captured before PHI-on shipped. MIR13 allows replaying them without regeneration.
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- Diagnostics: Edge-copy runs make it easier to isolate builder regressions by removing PHI synthesis from the equation.
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- Tooling parity: Certain scripts still compare MIR13 traces; they will be retired once PHI-on parity checks are complete.
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Flags and Behavior
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- NYASH_MIR_NO_PHI (default: 0)
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- 0: Builders emit PHIs at merge heads (MIR14, default).
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- 1: Builders drop PHIs and insert per-predecessor edge copies (MIR13 fallback).
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- NYASH_VERIFY_ALLOW_NO_PHI (default: 0 unless PHI-off is requested)
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- Set this to 1 together with `NYASH_MIR_NO_PHI=1` when you intentionally relax SSA verification.
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- NYASH_LLVM_USE_HARNESS=1 (AOT via llvmlite harness)
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- In MIR13 mode the harness synthesizes PHIs. In MIR14 it simply validates incoming edges.
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LLVM (llvmlite) Responsibilities
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- `setup_phi_placeholders()`: still records declared PHIs; in MIR13 mode it creates placeholders for later wiring.
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- `block_end_values`: snapshots per block end to materialize predecessor values (dominance-safe).
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- `finalize_phis()`: wires incoming edges for declared PHIs; when MIR13 runs, it creates PHIs on the fly to recover SSA.
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- `Resolver.resolve_i64()`:
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- single-pred: take predecessor end value;
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- multi-pred + declared PHI: reuse the placeholder at the block head;
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- multi-pred + no PHI: synthesize a localization PHI at the current block head (MIR13 compatibility);
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- avoids reusing non-dominating vmap values across blocks.
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Bridge/Builder (JSON v0) Behavior
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- MIR14 (default): If/Loop/Try placements emit PHIs up front; loop latches, break/continue, and structured joins have explicit incoming pairs.
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- MIR13 (fallback): Merges are performed with edge copies (`merge_var_maps`). Use only when reproducing historical issues.
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Testing (v2)
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- Integration suite (LLVM harness/PHI invariants):
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- `tools/smokes/v2/run.sh --profile integration`
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- Bridge/PyVM の検証は v2 スイートに統合（必要に応じてフィルタを使用）
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How to Force PHI-off (MIR13 fallback)
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- Set: `NYASH_MIR_NO_PHI=1 NYASH_VERIFY_ALLOW_NO_PHI=1`
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- Run integration: `tools/smokes/v2/run.sh --profile integration`
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- Label the run as legacy in `CURRENT_TASK.md` if results inform shared debugging.
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Known Limitations (current)
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- MIR13 no longer receives new feature work; expect missing coverage for recent LoopForm updates.
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- PHI-on is the supported path. MIR13 bugs are fixed only when they block diagnostics.
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