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# JIT Events JSON (v0.1)
最小のイベントJSONスキーマ。観測の足場として、値は安定キーのみを出力します。
- 出力形態: 1行 = 1 JSONJSONL
- 出力先: 標準出力 or `NYASH_JIT_EVENTS_PATH` で指定したファイル
- phase分離:
- compile: `phase: "lower"`明示opt-in: `NYASH_JIT_EVENTS_COMPILE=1`
- runtime: `phase: "execute"`既定ON可: `NYASH_JIT_EVENTS=1` または `NYASH_JIT_EVENTS_RUNTIME=1`
## フィールド(必須)
- kind: 文字列(例: "hostcall"
- function: 文字列(現状は "<jit>" で固定)
- phase: 文字列("lower" | "execute"
- id: シンボル名(例: "nyash.map.get_hh"
- decision: 文字列("allow" | "fallback"
- reason: 文字列("sig_ok" | "receiver_not_param" | "policy_denied_mutating" | "sig_mismatch" など)
- argc: 数値(観測引数数)
- arg_types: 文字列配列(例: ["Handle","I64"]
任意フィールド(存在時のみ)
- handle: 数値JITハンドル
- ms: 数値(処理時間ミリ秒)
## 出力例
compilelower:
```json
{"kind":"hostcall","function":"<jit>","id":"nyash.map.get_hh","decision":"allow","reason":"sig_ok","argc":2,"arg_types":["Handle","Handle"],"phase":"lower"}
```
runtimeexecute:
```json
{"kind":"hostcall","function":"<jit>","id":"nyash.array.push_h","decision":"fallback","reason":"policy_denied_mutating","argc":2,"arg_types":["Handle","I64"],"phase":"execute"}
```
trapexecute 中の失敗):
```json
{"kind":"trap","function":"<jit>","reason":"jit_execute_failed","ms":0,"phase":"execute"}
```
## 環境変数(抜粋)
- NYASH_JIT_EVENTS=1: 既定のruntime出力
- NYASH_JIT_EVENTS_COMPILE=1: compilelower出力
- NYASH_JIT_EVENTS_RUNTIME=1: runtime出力
- NYASH_JIT_EVENTS_PATH=path.jsonl: ファイルに追記
- NYASH_JIT_THRESHOLD未設定時: 観測ONで自動的に1が補われますRunner/DebugConfigBoxが補助
## 推奨の最小運用
- 現象確認: `NYASH_JIT_EVENTS=1`runtimeのみ
- 解析時のみcompile出力: `NYASH_JIT_EVENTS_COMPILE=1 NYASH_JIT_EVENTS_PATH=events.jsonl`
- HostCall系の例では `NYASH_JIT_HOSTCALL=1` を明示