Struct rustc_middle::mir::interpret::allocation::init_mask::InitMask

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pub struct InitMask {
    blocks: InitMaskBlocks,
    len: Size,
}
Expand description

A bitmask where each bit refers to the byte with the same index. If the bit is true, the byte is initialized. If it is false the byte is uninitialized. The actual bits are only materialized when needed, and we try to keep this data lazy as long as possible. Currently, if all the blocks have the same value, then the mask represents either a fully initialized or fully uninitialized const allocation, so we can only store that single value.

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§blocks: InitMaskBlocks§len: Size

Implementations§

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impl InitMask

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pub fn new(size: Size, state: bool) -> Self

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pub fn is_range_initialized(&self, range: AllocRange) -> Result<(), AllocRange>

Checks whether the range is entirely initialized.

Returns Ok(()) if it’s initialized. Otherwise returns a range of byte indexes for the first contiguous span of the uninitialized access.

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pub fn set_range(&mut self, range: AllocRange, new_state: bool)

Sets a specified range to a value. If the range is out-of-bounds, the mask will grow to accommodate it entirely.

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fn materialize_blocks(&mut self) -> &mut InitMaskMaterialized

Materializes this mask’s blocks when the mask is lazy.

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pub fn get(&self, idx: Size) -> bool

Returns the initialization state at the specified in-bounds index.

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impl InitMask

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pub fn range_as_init_chunks(&self, range: AllocRange) -> InitChunkIter<'_>

Returns an iterator, yielding a range of byte indexes for each contiguous region of initialized or uninitialized bytes inside the range start..end (end-exclusive).

The iterator guarantees the following:

  • Chunks are nonempty.
  • Chunks are adjacent (each range’s start is equal to the previous range’s end).
  • Chunks span exactly start..end (the first starts at start, the last ends at end).
  • Chunks alternate between InitChunk::Init and InitChunk::Uninit.
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impl InitMask

Transferring the initialization mask to other allocations.

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pub fn prepare_copy(&self, range: AllocRange) -> InitCopy

Creates a run-length encoding of the initialization mask; panics if range is empty.

This is essentially a more space-efficient version of InitMask::range_as_init_chunks(...).collect::<Vec<_>>().

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pub fn apply_copy(&mut self, defined: InitCopy, range: AllocRange, repeat: u64)

Applies multiple instances of the run-length encoding to the initialization mask.

Trait Implementations§

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impl Clone for InitMask

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fn clone(&self) -> InitMask

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 InitMask

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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: TyDecoder> Decodable<__D> for InitMask

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

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impl<__E: TyEncoder> Encodable<__E> for InitMask

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

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impl Hash for InitMask

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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<'__ctx> HashStable<StableHashingContext<'__ctx>> for InitMask

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )

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impl PartialEq for InitMask

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fn eq(&self, other: &InitMask) -> 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 Eq for InitMask

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impl StructuralPartialEq for InitMask

Auto Trait 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> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any(&self) -> &(dyn Any + 'static)

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impl<T> Borrow<T> for T
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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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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<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.
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impl<Q, K> Equivalent<K> for Q
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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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type Error = !

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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

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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.

Size: 32 bytes