## HygieneData

# Struct HygieneData

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    pub(crate) struct HygieneData {
        local_expn_data: IndexVec<LocalExpnId, Option<ExpnData>>,
        local_expn_hashes: IndexVec<LocalExpnId, ExpnHash>,
        foreign_expn_data: FxHashMap<ExpnId, ExpnData>,
        foreign_expn_hashes: FxHashMap<ExpnId, ExpnHash>,
        expn_hash_to_expn_id: UnhashMap<ExpnHash, ExpnId>,
        syntax_context_data: Vec<SyntaxContextData>,
        syntax_context_map: FxHashMap<SyntaxContextKey, SyntaxContext>,
        expn_data_disambiguators: UnhashMap<Hash64, u32>,
    }

## Fields§

§`local_expn_data: IndexVec<LocalExpnId, Option<ExpnData>>`

Each expansion should have an associated expansion data, but sometimes there’s a delay between creation of an expansion ID and obtaining its data (e.g. macros are collected first and then resolved later), so we use an `Option` here.

§`local_expn_hashes: IndexVec<LocalExpnId, ExpnHash>`§`foreign_expn_data: FxHashMap<ExpnId, ExpnData>`

Data and hash information from external crates. We may eventually want to remove these maps, and fetch the information directly from the other crate’s metadata like DefIds do.

§`foreign_expn_hashes: FxHashMap<ExpnId, ExpnHash>`§`expn_hash_to_expn_id: UnhashMap<ExpnHash, ExpnId>`§`syntax_context_data: Vec<SyntaxContextData>`§`syntax_context_map: FxHashMap<SyntaxContextKey, SyntaxContext>`§`expn_data_disambiguators: UnhashMap<Hash64, u32>`

Maps the `local_hash` of an `ExpnData` to the next disambiguator value. This is used by `update_disambiguator` to keep track of which `ExpnData`s would have collisions without a disambiguator. The keys of this map are always computed with `ExpnData.disambiguator` set to 0.

## Implementations§

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### impl HygieneData

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#### pub(crate) fn new(edition: Edition) -> Self

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#### fn with<R>(f: impl FnOnce(&mut HygieneData) -> R) -> R

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#### fn expn_hash(&self, expn_id: ExpnId) -> ExpnHash

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#### fn local_expn_data(&self, expn_id: LocalExpnId) -> &ExpnData

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#### fn expn_data(&self, expn_id: ExpnId) -> &ExpnData

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#### fn is_descendant_of(&self, expn_id: ExpnId, ancestor: ExpnId) -> bool

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#### fn normalize_to_macros_2_0(&self, ctxt: SyntaxContext) -> SyntaxContext

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#### fn normalize_to_macro_rules(&self, ctxt: SyntaxContext) -> SyntaxContext

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#### fn outer_expn(&self, ctxt: SyntaxContext) -> ExpnId

See `SyntaxContextData::outer_expn`

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#### fn outer_mark(&self, ctxt: SyntaxContext) -> (ExpnId, Transparency)

The last macro expansion and its Transparency

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#### fn parent_ctxt(&self, ctxt: SyntaxContext) -> SyntaxContext

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#### fn remove_mark(&self, ctxt: &mut SyntaxContext) -> (ExpnId, Transparency)

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#### fn marks(&self, ctxt: SyntaxContext) -> Vec<(ExpnId, Transparency)>

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#### fn walk_chain(&self, span: Span, to: SyntaxContext) -> Span

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#### fn walk_chain_collapsed(&self, span: Span, to: Span) -> Span

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#### fn adjust(&self, ctxt: &mut SyntaxContext, expn_id: ExpnId) -> Option<ExpnId>

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#### fn apply_mark( &mut self, ctxt: SyntaxContext, expn_id: ExpnId, transparency: Transparency, ) -> SyntaxContext

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#### fn alloc_ctxt( &mut self, parent: SyntaxContext, expn_id: ExpnId, transparency: Transparency, ) -> SyntaxContext

Allocate a new context with the given key, or retrieve it from cache if the given key already exists. The auxiliary fields are calculated from the key.

## Trait Implementations§

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### impl Debug for HygieneData

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl DynSend for HygieneData

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### impl DynSync for HygieneData

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### impl Freeze for HygieneData

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### impl RefUnwindSafe for HygieneData

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### impl Send for HygieneData

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### impl Sync for HygieneData

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### impl Unpin for HygieneData

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### impl UnwindSafe for HygieneData

## Blanket Implementations§

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### impl<T> Aligned for T

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#### const ALIGN: Alignment

Alignment of `Self`.
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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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where T: ?Sized,

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#### fn from(t: T) -> T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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### impl<T> Pointable for T

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#### const ALIGN: usize

The alignment of pointer.
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#### type Init = T

The type for initializers.
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Initializes a with the given initializer. Read more
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Dereferences the given pointer. Read more
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Mutably dereferences the given pointer. Read more
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Drops the object pointed to by the given pointer. Read more
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### impl<T> Same for T

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#### type Output = T

Should always be `Self`
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more

## Layout§

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.

Size: 232 bytes