Enum rustc_mir_transform::gvn::Value

enum Value<'tcx> {
    Opaque(usize),
    Constant {
        value: Const<'tcx>,
        disambiguator: usize,
    },
    Aggregate(AggregateTy<'tcx>, VariantIdx, Vec<VnIndex>),
    Repeat(VnIndex, Const<'tcx>),
    Address {
        place: Place<'tcx>,
        kind: AddressKind,
        provenance: usize,
    },
    Projection(VnIndex, ProjectionElem<VnIndex, Ty<'tcx>>),
    Discriminant(VnIndex),
    Len(VnIndex),
    NullaryOp(NullOp<'tcx>, Ty<'tcx>),
    UnaryOp(UnOp, VnIndex),
    BinaryOp(BinOp, VnIndex, VnIndex),
    Cast {
        kind: CastKind,
        value: VnIndex,
        from: Ty<'tcx>,
        to: Ty<'tcx>,
    },
}

Variants

Opaque(usize)

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: usize

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(AggregateTy<'tcx>, VariantIdx, Vec<VnIndex>)

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

Repeat(VnIndex, Const<'tcx>)

This corresponds to a [value; count] expression.

Address

The address of a place.

Fields

place: Place<'tcx>

kind: AddressKind

provenance: usize

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

Projection(VnIndex, ProjectionElem<VnIndex, Ty<'tcx>>)

This is the value obtained by projecting another value.

Discriminant(VnIndex)

Discriminant of the given value.

Len(VnIndex)

Length of an array or slice.

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

UnaryOp(UnOp, VnIndex)

BinaryOp(BinOp, VnIndex, VnIndex)

Cast

Fields

kind: CastKind

value: VnIndex

from: Ty<'tcx>

to: Ty<'tcx>

Trait Implementations

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

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

Formats the value using the given formatter.

impl<'tcx> Hash for Value<'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<'tcx> PartialEq for Value<'tcx>

fn eq(&self, other: &Value<'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<'tcx> Eq for Value<'tcx>

impl<'tcx> StructuralPartialEq for Value<'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: 56 bytes

Size for each variant:

• Opaque: 16 bytes
• Constant: 56 bytes
• Aggregate: 56 bytes
• Repeat: 24 bytes
• Address: 40 bytes
• Projection: 40 bytes
• Discriminant: 12 bytes
• Len: 12 bytes
• NullaryOp: 32 bytes
• UnaryOp: 16 bytes
• BinaryOp: 20 bytes
• Cast: 32 bytes