35 lines
1.7 KiB
Markdown
35 lines
1.7 KiB
Markdown
ScopeBox and MIR Scope Hints (Dev/CI option)
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Overview
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- ScopeBox is an optional, compile-time-only wrapper that makes lexical scopes explicit in the AST for diagnostics and macro visibility. It is a no-op for execution: MIR lowering treats ScopeBox like a normal block and semantics are unchanged.
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How to enable
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- Inject ScopeBox wrappers during core normalization by setting:
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- `NYASH_SCOPEBOX_ENABLE=1`
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- Selfhost compiler path: Runner maps `NYASH_SCOPEBOX_ENABLE=1` to child arg `--scopebox` and applies a JSON prepass via `apps/lib/scopebox_inject.nyash`（現状は恒等: 構文確認のみ）。
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- Injection points:
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- If.then / If.else bodies
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- Loop.body
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- Bare blocks are represented by `Program { statements }` and already get ScopeEnter/ScopeLeave hints.
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MIR Scope Hints (unified env)
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- Configure hint output with a single env using a pipe-style syntax:
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- `NYASH_MIR_HINTS="<target>|<filters>..."`
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- Targets:
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- `trace` or `stderr`: print human-friendly hints to stderr
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- `jsonl=<path>` or a file path: append one JSON object per line
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- Filters:
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- `all` (default), `scope`, `join`, `loop`, `phi`
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- Examples:
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- `NYASH_MIR_HINTS="trace|all"`
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- `NYASH_MIR_HINTS="jsonl=tmp/hints.jsonl|scope|join"`
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- `NYASH_MIR_HINTS="tmp/hints.jsonl|loop"`
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- Back-compat:
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- `NYASH_MIR_TRACE_HINTS=1` is still accepted (equivalent to `trace|all`).
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Zero-cost policy
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- ScopeBox is removed implicitly during MIR lowering (treated as a block). ScopeEnter/ScopeLeave hints are observational only. Execution and IR are unchanged.
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Notes (Selfhost path)
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- 当面は JSON v0 に `ScopeBox` 型は導入しない（互換維持）。前処理は恒等（identity）から開始し、将来は安全な包み込み/ヒント付与を検討する。
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