charon_lib::ast::expressions

Enum ProjectionElem

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pub enum ProjectionElem {
    Deref,
    Field(FieldProjKind, FieldId),
    Index {
        offset: Box<Operand>,
        from_end: bool,
    },
    Subslice {
        from: Box<Operand>,
        to: Box<Operand>,
        from_end: bool,
    },
}
Expand description

Note that we don’t have the equivalent of “downcasts”. Downcasts are actually necessary, for instance when initializing enumeration values: the value is initially Bottom, and we need a way of knowing the variant. For example: ((_0 as Right).0: T2) = move _1; In MIR, downcasts always happen before field projections: in our internal language, we thus merge downcasts and field projections.

Variants§

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Deref

Dereference a shared/mutable reference, a box, or a raw pointer.

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Field(FieldProjKind, FieldId)

Projection from ADTs (variants, structures). We allow projections to be used as left-values and right-values. We should never have projections to fields of symbolic variants (they should have been expanded before through a match).

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Index

MIR imposes that the argument to an index projection be a local variable, meaning that even constant indices into arrays are let-bound as separate variables. We eliminate this variant in a micro-pass.

Fields

§offset: Box<Operand>
§from_end: bool
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Subslice

Take a subslice of a slice or array. If from_end is true this is slice[from..slice.len() - to], otherwise this is slice[from..to]. We eliminate this variant in a micro-pass.

Fields

§from: Box<Operand>
§from_end: bool

Implementations§

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impl ProjectionElem

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pub fn is_deref(&self) -> bool

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pub fn is_field(&self) -> bool

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pub fn is_index(&self) -> bool

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pub fn is_subslice(&self) -> bool

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impl ProjectionElem

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pub fn as_deref(&self) -> Option<()>

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pub fn as_field(&self) -> Option<(&FieldProjKind, &FieldId)>

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pub fn as_index(&self) -> Option<(&Box<Operand>, &bool)>

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pub fn as_subslice(&self) -> Option<(&Box<Operand>, &Box<Operand>, &bool)>

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impl ProjectionElem

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pub fn as_deref_mut(&mut self) -> Option<()>

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pub fn as_field_mut(&mut self) -> Option<(&mut FieldProjKind, &mut FieldId)>

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pub fn as_index_mut(&mut self) -> Option<(&mut Box<Operand>, &mut bool)>

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pub fn as_subslice_mut( &mut self, ) -> Option<(&mut Box<Operand>, &mut Box<Operand>, &mut bool)>

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impl ProjectionElem

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pub fn to_deref(self) -> Option<()>

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pub fn to_field(self) -> Option<(FieldProjKind, FieldId)>

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pub fn to_index(self) -> Option<(Box<Operand>, bool)>

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pub fn to_subslice(self) -> Option<(Box<Operand>, Box<Operand>, bool)>

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impl ProjectionElem

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pub fn variant_name(&self) -> &'static str

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impl ProjectionElem

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pub fn project_type( &self, type_decls: &Vector<TypeDeclId, TypeDecl>, ty: &Ty, ) -> Result<Ty, ()>

Compute the type obtained when applying the current projection to a place of type ty.

Trait Implementations§

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impl Clone for ProjectionElem

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fn clone(&self) -> ProjectionElem

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 ProjectionElem

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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<'de> Deserialize<'de> for ProjectionElem

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Drive for ProjectionElem

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fn drive<V: Visitor>(&self, visitor: &mut V)

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impl DriveMut for ProjectionElem

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fn drive_mut<V: VisitorMut>(&mut self, visitor: &mut V)

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impl PartialEq for ProjectionElem

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

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for ProjectionElem

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Eq for ProjectionElem

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impl StructuralPartialEq for ProjectionElem

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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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
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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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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impl<I, T> ExtractContext<I, ()> for T

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fn extract_context(self, _original_input: I)

Given the context attached to a nom error, and given the original input to the nom parser, extract more the useful context information. 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<I> RecreateContext<I> for I

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fn recreate_context(_original_input: I, tail: I) -> I

Given the original input, as well as the context reported by nom, recreate a context in the original string where the error occurred. Read more
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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.
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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<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,