[−][src]Trait rustc_data_structures::stable_hasher::HashStable
⚙️ This is an internal compiler API. (rustc_private
)
This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml
.
Something that implements HashStable<CTX>
can be hashed in a way that is
stable across multiple compilation sessions.
Note that HashStable
imposes rather more strict requirements than usual
hash functions:

Stable hashes are sometimes used as identifiers. Therefore they must conform to the corresponding
PartialEq
implementations:x == y
implieshash_stable(x) == hash_stable(y)
, andx != y
implieshash_stable(x) != hash_stable(y)
.
That second condition is usually not required for hash functions (e.g.
Hash
). In practice this means thathash_stable
must feed any information into the hasher that aPartialEq
comparison takes into account. See #49300 for an example where violating this invariant has caused trouble in the past. 
hash_stable()
must be independent of the current compilation session. E.g. they must not hash memory addresses or other things that are "randomly" assigned per compilation session. 
hash_stable()
must be independent of the host architecture. TheStableHasher
takes care of endianness andisize
/usize
platform differences.
Required methods
fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)
⚙️ This is an internal compiler API. (rustc_private
)
This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml
.
Implementations on Foreign Types
impl<CTX> HashStable<CTX> for i8
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for i16
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for i32
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for i64
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for isize
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for u8
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for u16
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for u32
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for u64
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for usize
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for u128
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for i128
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for char
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for ()
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for NonZeroU32
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for f32
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for f64
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for Ordering
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T1: HashStable<CTX>, CTX> HashStable<CTX> for (T1,)
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T1: HashStable<CTX>, T2: HashStable<CTX>, CTX> HashStable<CTX> for (T1, T2)
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T1, T2, T3, CTX> HashStable<CTX> for (T1, T2, T3) where
T1: HashStable<CTX>,
T2: HashStable<CTX>,
T3: HashStable<CTX>,
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T1: HashStable<CTX>,
T2: HashStable<CTX>,
T3: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T1, T2, T3, T4, CTX> HashStable<CTX> for (T1, T2, T3, T4) where
T1: HashStable<CTX>,
T2: HashStable<CTX>,
T3: HashStable<CTX>,
T4: HashStable<CTX>,
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T1: HashStable<CTX>,
T2: HashStable<CTX>,
T3: HashStable<CTX>,
T4: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T: HashStable<CTX>, CTX> HashStable<CTX> for [T]
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default fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T: HashStable<CTX>, CTX> HashStable<CTX> for Vec<T>
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<K, V, R, CTX> HashStable<CTX> for IndexMap<K, V, R> where
K: HashStable<CTX> + Eq + Hash,
V: HashStable<CTX>,
R: BuildHasher,
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K: HashStable<CTX> + Eq + Hash,
V: HashStable<CTX>,
R: BuildHasher,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<K, R, CTX> HashStable<CTX> for IndexSet<K, R> where
K: HashStable<CTX> + Eq + Hash,
R: BuildHasher,
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K: HashStable<CTX> + Eq + Hash,
R: BuildHasher,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<A, CTX> HashStable<CTX> for SmallVec<[A; 1]> where
A: HashStable<CTX>,
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A: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T: ?Sized + HashStable<CTX>, CTX> HashStable<CTX> for Box<T>
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T: ?Sized + HashStable<CTX>, CTX> HashStable<CTX> for Arc<T>
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for str
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for String
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fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for bool
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T, CTX> HashStable<CTX> for Option<T> where
T: HashStable<CTX>,
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T: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T1, T2, CTX> HashStable<CTX> for Result<T1, T2> where
T1: HashStable<CTX>,
T2: HashStable<CTX>,
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T1: HashStable<CTX>,
T2: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<'a, T: ?Sized, CTX> HashStable<CTX> for &'a T where
T: HashStable<CTX>,
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T: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<T, CTX> HashStable<CTX> for Discriminant<T>
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<T, CTX> HashStable<CTX> for RangeInclusive<T> where
T: HashStable<CTX>,
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T: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<I: Idx, T, CTX> HashStable<CTX> for IndexVec<I, T> where
T: HashStable<CTX>,
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T: HashStable<CTX>,
fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<I: Idx, CTX> HashStable<CTX> for BitSet<I>
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<R: Idx, C: Idx, CTX> HashStable<CTX> for BitMatrix<R, C>
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fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for Path
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for PathBuf
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<K, V, R, HCX> HashStable<HCX> for HashMap<K, V, R> where
K: ToStableHashKey<HCX> + Eq,
V: HashStable<HCX>,
R: BuildHasher,
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K: ToStableHashKey<HCX> + Eq,
V: HashStable<HCX>,
R: BuildHasher,
fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher)
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impl<K, R, HCX> HashStable<HCX> for HashSet<K, R> where
K: ToStableHashKey<HCX> + Eq,
R: BuildHasher,
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K: ToStableHashKey<HCX> + Eq,
R: BuildHasher,
fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher)
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impl<K, V, HCX> HashStable<HCX> for BTreeMap<K, V> where
K: ToStableHashKey<HCX>,
V: HashStable<HCX>,
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K: ToStableHashKey<HCX>,
V: HashStable<HCX>,
fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher)
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impl<K, HCX> HashStable<HCX> for BTreeSet<K> where
K: ToStableHashKey<HCX>,
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K: ToStableHashKey<HCX>,
fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher)
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Implementors
impl<CTX> HashStable<CTX> for Fingerprint
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fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for Edge
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fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX> HashStable<CTX> for Index
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fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)
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impl<CTX, T> HashStable<CTX> for TransitiveRelation<T> where
T: HashStable<CTX> + Eq + Debug + Clone + Hash,
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T: HashStable<CTX> + Eq + Debug + Clone + Hash,
fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)
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impl<T> HashStable<T> for Svh
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fn hash_stable(&self, ctx: &mut T, hasher: &mut StableHasher)
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impl<T, HCX> HashStable<HCX> for StableVec<T> where
T: HashStable<HCX> + ToStableHashKey<HCX>,
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T: HashStable<HCX> + ToStableHashKey<HCX>,