Enum Value 

enum Value<'a, 'tcx> {
    Opaque(VnOpaque),
    Constant {
        value: Const<'tcx>,
        disambiguator: Option<VnOpaque>,
    },
    Aggregate(VariantIdx, &'a [VnIndex]),
    Union(FieldIdx, VnIndex),
    RawPtr {
        pointer: VnIndex,
        metadata: VnIndex,
    },
    Repeat(VnIndex, Const<'tcx>),
    Address {
        base: AddressBase,
        projection: &'a [ProjectionElem<VnIndex, Ty<'tcx>>],
        kind: AddressKind,
        provenance: VnOpaque,
    },
    Projection(VnIndex, ProjectionElem<VnIndex, ()>),
    Discriminant(VnIndex),
    NullaryOp(NullOp<'tcx>, Ty<'tcx>),
    UnaryOp(UnOp, VnIndex),
    BinaryOp(BinOp, VnIndex, VnIndex),
    Cast {
        kind: CastKind,
        value: VnIndex,
    },
}

Variants

Opaque(VnOpaque)

Used to represent values we know nothing about. The usize is a counter incremented by new_opaque.

Constant

Evaluated or unevaluated constant value.

Fields

value: Const<'tcx>

disambiguator: Option<VnOpaque>

Some constants do not have a deterministic value. To avoid merging two instances of the same Const, we assign them an additional integer index.

Aggregate(VariantIdx, &'a [VnIndex])

An aggregate value, either tuple/closure/struct/enum. This does not contain unions, as we cannot reason with the value.

Union(FieldIdx, VnIndex)

A union aggregate value.

RawPtr

A raw pointer aggregate built from a thin pointer and metadata.

Fields

pointer: VnIndex

Thin pointer component. This is field 0 in MIR.

metadata: VnIndex

Metadata component. This is field 1 in MIR.

Repeat(VnIndex, Const<'tcx>)

This corresponds to a [value; count] expression.

Address

The address of a place.

Fields

base: AddressBase

projection: &'a [ProjectionElem<VnIndex, Ty<'tcx>>]

kind: AddressKind

provenance: VnOpaque

Give each borrow and pointer a different provenance, so we don’t merge them.

Projection(VnIndex, ProjectionElem<VnIndex, ()>)

This is the value obtained by projecting another value.

Discriminant(VnIndex)

Discriminant of the given value.

NullaryOp(NullOp<'tcx>, Ty<'tcx>)

UnaryOp(UnOp, VnIndex)

BinaryOp(BinOp, VnIndex, VnIndex)

Cast

Fields

kind: CastKind

value: VnIndex

Trait Implementations

impl<'a, 'tcx> Clone for Value<'a, 'tcx>

fn clone(&self) -> Value<'a, 'tcx>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, 'tcx> Debug for Value<'a, 'tcx>

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

Formats the value using the given formatter.

impl<'a, 'tcx> Hash for Value<'a, 'tcx>

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a, 'tcx> PartialEq for Value<'a, 'tcx>

fn eq(&self, other: &Value<'a, 'tcx>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

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

impl<'a, 'tcx> Copy for Value<'a, 'tcx>

impl<'a, 'tcx> Eq for Value<'a, 'tcx>

impl<'a, 'tcx> StructuralPartialEq for Value<'a, 'tcx>

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: 48 bytes

Size for each variant:

• Opaque: 0 bytes
• Constant: 48 bytes
• Aggregate: 32 bytes
• Union: 16 bytes
• RawPtr: 16 bytes
• Repeat: 24 bytes
• Address: 40 bytes
• Projection: 40 bytes
• Discriminant: 12 bytes
• NullaryOp: 32 bytes
• UnaryOp: 16 bytes
• BinaryOp: 20 bytes
• Cast: 16 bytes