# Struct rustc_middle::query::on_disk_cache::OnDiskCache

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    pub struct OnDiskCache<'sess> {
        serialized_data: RwLock<Option<Mmap>>,
        current_side_effects: Lock<FxHashMap<DepNodeIndex, QuerySideEffects>>,
        source_map: &'sess SourceMap,
        file_index_to_stable_id: FxHashMap<SourceFileIndex, EncodedSourceFileId>,
        file_index_to_file: Lock<FxHashMap<SourceFileIndex, Lrc<SourceFile>>>,
        query_result_index: FxHashMap<SerializedDepNodeIndex, AbsoluteBytePos>,
        prev_side_effects_index: FxHashMap<SerializedDepNodeIndex, AbsoluteBytePos>,
        alloc_decoding_state: AllocDecodingState,
        syntax_contexts: FxHashMap<u32, AbsoluteBytePos>,
        expn_data: UnhashMap<ExpnHash, AbsoluteBytePos>,
        hygiene_context: HygieneDecodeContext,
        foreign_expn_data: UnhashMap<ExpnHash, u32>,
    }

Expand description

Provides an interface to incremental compilation data cached from the previous compilation session. This data will eventually include the results of a few selected queries (like `typeck` and `mir_optimized`) and any side effects that have been emitted during a query.

## Fields§

§`serialized_data: RwLock<Option<Mmap>>`§`current_side_effects: Lock<FxHashMap<DepNodeIndex, QuerySideEffects>>`§`source_map: &'sess SourceMap`§`file_index_to_stable_id: FxHashMap<SourceFileIndex, EncodedSourceFileId>`§`file_index_to_file: Lock<FxHashMap<SourceFileIndex, Lrc<SourceFile>>>`§`query_result_index: FxHashMap<SerializedDepNodeIndex, AbsoluteBytePos>`§`prev_side_effects_index: FxHashMap<SerializedDepNodeIndex, AbsoluteBytePos>`§`alloc_decoding_state: AllocDecodingState`§`syntax_contexts: FxHashMap<u32, AbsoluteBytePos>`§`expn_data: UnhashMap<ExpnHash, AbsoluteBytePos>`§`hygiene_context: HygieneDecodeContext`§`foreign_expn_data: UnhashMap<ExpnHash, u32>`

## Implementations§

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### impl<'sess> OnDiskCache<'sess>

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#### pub fn new( sess: &'sess Session, data: Mmap, start_pos: usize, ) -> Result<Self, ()>

Creates a new `OnDiskCache` instance from the serialized data in `data`.

The serialized cache has some basic integrity checks, if those checks indicate that the on-disk data is corrupt, an error is returned.

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#### pub fn new_empty(source_map: &'sess SourceMap) -> Self

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#### pub fn drop_serialized_data(&self, tcx: TyCtxt<'_>)

Execute all cache promotions and release the serialized backing Mmap.

Cache promotions require invoking queries, which needs to read the serialized data. In order to serialize the new on-disk cache, the former on-disk cache file needs to be deleted, hence we won’t be able to refer to its memmapped data.

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#### pub fn serialize( &self, tcx: TyCtxt<'_>, encoder: FileEncoder, ) -> FileEncodeResult

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#### pub fn load_side_effects( &self, tcx: TyCtxt<'_>, dep_node_index: SerializedDepNodeIndex, ) -> QuerySideEffects

Loads a `QuerySideEffects` created during the previous compilation session.

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#### pub fn store_side_effects( &self, dep_node_index: DepNodeIndex, side_effects: QuerySideEffects, )

Stores a `QuerySideEffects` emitted during the current compilation session. Anything stored like this will be available via `load_side_effects` in the next compilation session.

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#### pub fn loadable_from_disk(&self, dep_node_index: SerializedDepNodeIndex) -> bool

Return whether the cached query result can be decoded.

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#### pub fn try_load_query_result<'tcx, T>( &self, tcx: TyCtxt<'tcx>, dep_node_index: SerializedDepNodeIndex, ) -> Option<T>
where T: for<'a> Decodable<CacheDecoder<'a, 'tcx>>,

Returns the cached query result if there is something in the cache for the given `SerializedDepNodeIndex`; otherwise returns `None`.

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#### pub fn store_side_effects_for_anon_node( &self, dep_node_index: DepNodeIndex, side_effects: QuerySideEffects, )

Stores side effect emitted during computation of an anonymous query. Since many anonymous queries can share the same `DepNode`, we aggregate them – as opposed to regular queries where we assume that there is a 1:1 relationship between query-key and `DepNode`.

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#### fn load_indexed<'tcx, T>( &self, tcx: TyCtxt<'tcx>, dep_node_index: SerializedDepNodeIndex, index: &FxHashMap<SerializedDepNodeIndex, AbsoluteBytePos>, ) -> Option<T>
where T: for<'a> Decodable<CacheDecoder<'a, 'tcx>>,

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#### fn with_decoder<'a, 'tcx, T, F: for<'s> FnOnce(&mut CacheDecoder<'s, 'tcx>) -> T>( &'sess self, tcx: TyCtxt<'tcx>, pos: AbsoluteBytePos, f: F, ) -> T
where T: Decodable<CacheDecoder<'a, 'tcx>>,

## Auto Trait Implementations§

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### impl<'sess> DynSend for OnDiskCache<'sess>

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### impl<'sess> DynSync for OnDiskCache<'sess>

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### impl<'sess> !Freeze for OnDiskCache<'sess>

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### impl<'sess> !RefUnwindSafe for OnDiskCache<'sess>

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### impl<'sess> !Send for OnDiskCache<'sess>

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### impl<'sess> !Sync for OnDiskCache<'sess>

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### impl<'sess> Unpin for OnDiskCache<'sess>

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### impl<'sess> !UnwindSafe for OnDiskCache<'sess>

## 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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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T, R> CollectAndApply<T, R> for T

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#### fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to `f(&iter.collect::<Vec<_>>())`.

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#### type Output = R

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### impl<T> Filterable for T

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#### fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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### impl<T> From<T> for T

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

Returns the argument unchanged.

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### impl<T> Instrument for 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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### impl<T> IntoEither for T

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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<P> IntoQueryParam<P> for P

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#### fn into_query_param(self) -> P

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### impl<T> MaybeResult<T> for T

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#### type Error = !

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#### fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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#### fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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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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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

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<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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#### fn upcast(self, interner: I) -> U

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### impl<I, T> UpcastFrom<I, T> for T

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#### fn upcast_from(from: T, _tcx: I) -> T

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### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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#### fn vzip(self) -> V

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### impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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#### default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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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
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### impl<'a, T> Captures<'a> for T
where T: ?Sized,

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### impl<T> ErasedDestructor for T
where T: 'static,

## 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: 448 bytes