pub struct StableSourceFileId {
    pub file_name_hash: Hash64,
    pub cnum: CrateNum,
}
Expand description

This is a SourceFile identifier that is used to correlate source files between subsequent compilation sessions (which is something we need to do during incremental compilation).

The StableSourceFileId also contains the CrateNum of the crate the source file was originally parsed for. This way we get two separate entries in the SourceMap if the same file is part of both the local and an upstream crate. Trying to only have one entry for both cases is problematic because at the point where we discover that there’s a local use of the file in addition to the upstream one, we might already have made decisions based on the assumption that it’s an upstream file. Treating the two files as different has no real downsides.

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§file_name_hash: Hash64

A hash of the source file’s FileName. This is hash so that it’s size is more predictable than if we included the actual FileName value.

§cnum: CrateNum

The CrateNum of the crate this source file was originally parsed for. We cannot include this information in the hash because at the time of hashing we don’t have the context to map from the CrateNum’s numeric value to a StableCrateId.

Implementations§

Trait Implementations§

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impl Clone for StableSourceFileId

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fn clone(&self) -> StableSourceFileId

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for StableSourceFileId

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

Formats the value using the given formatter. Read more
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impl<__D: Decoder> Decodable<__D> for StableSourceFileId

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fn decode(__decoder: &mut __D) -> Self

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impl<__E: Encoder> Encodable<__E> for StableSourceFileId

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fn encode(&self, __encoder: &mut __E)

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impl Hash for StableSourceFileId

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for StableSourceFileId

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fn eq(&self, other: &StableSourceFileId) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for StableSourceFileId

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impl Eq for StableSourceFileId

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impl StructuralEq for StableSourceFileId

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impl StructuralPartialEq for StableSourceFileId

Auto Trait Implementations§

Blanket Implementations§

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.

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: 16 bytes