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arena_cache

rustc_middle::query::modifiers

Struct arena_cache 

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pub(crate) struct arena_cache;
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§arena_cache query modifier

Query return values must impl Copy and be small, but some queries must return values that doesn’t meet those criteria. Queries marked with this modifier have their values allocated in an arena and the query returns a reference to the value. There are two cases.

  • If the provider function returns T then the query will return &'tcx T.
  • If the provider function returns Option<T> then the query will return Option<&'tcx T>.

The query plumbing takes care of the arenas and the type manipulations.

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

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