[][src]Enum rustc_mir::interpret::ConstValue

pub enum ConstValue<'tcx> {
    Scalar(Scalar<()>),
    Slice {
        data: &'tcx Allocation<(), ()>,
        start: usize,
        end: usize,
    },
    ByRef {
        alloc: &'tcx Allocation<(), ()>,
        offset: Size,
    },
}

Represents a constant value in Rust. Scalar and Slice are optimizations for array length computations, enum discriminants and the pattern matching logic.

Variants

Scalar(Scalar<()>)

Used only for types with layout::abi::Scalar ABI and ZSTs.

Not using the enum Value to encode that this must not be Uninit.

Slice

Used only for &[u8] and &str

Fields of Slice

data: &'tcx Allocation<(), ()>start: usizeend: usize
ByRef

A value not represented/representable by Scalar or Slice

Fields of ByRef

alloc: &'tcx Allocation<(), ()>

The backing memory of the value, may contain more memory than needed for just the value in order to share Allocations between values

offset: Size

Offset into alloc

Implementations

impl<'tcx> ConstValue<'tcx>[src]

pub fn try_to_scalar(&self) -> Option<Scalar<()>>[src]

pub fn try_to_str_slice(&self) -> Option<&'tcx str>[src]

pub fn try_to_bits(&self, size: Size) -> Option<u128>[src]

pub fn try_to_bool(&self) -> Option<bool>[src]

pub fn try_to_machine_usize(&self, tcx: TyCtxt<'tcx>) -> Option<u64>[src]

pub fn try_to_bits_for_ty(
    &self,
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    ty: &'tcx TyS<'tcx>
) -> Option<u128>
[src]

pub fn from_bool(b: bool) -> ConstValue<'tcx>[src]

pub fn from_u64(i: u64) -> ConstValue<'tcx>[src]

pub fn from_machine_usize(i: u64, cx: &impl HasDataLayout) -> ConstValue<'tcx>[src]

Trait Implementations

impl<'tcx> Clone for ConstValue<'tcx>[src]

impl<'tcx> Copy for ConstValue<'tcx>[src]

impl<'tcx> Debug for ConstValue<'tcx>[src]

impl<'tcx> Eq for ConstValue<'tcx>[src]

impl<'tcx> Hash for ConstValue<'tcx>[src]

impl<'tcx> Ord for ConstValue<'tcx>[src]

impl<'tcx> PartialEq<ConstValue<'tcx>> for ConstValue<'tcx>[src]

impl<'tcx> PartialOrd<ConstValue<'tcx>> for ConstValue<'tcx>[src]

Auto Trait Implementations

impl<'tcx> RefUnwindSafe for ConstValue<'tcx>

impl<'tcx> Send for ConstValue<'tcx>

impl<'tcx> Sync for ConstValue<'tcx>

impl<'tcx> Unpin for ConstValue<'tcx>

impl<'tcx> UnwindSafe for ConstValue<'tcx>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Decodable for T where
    T: UseSpecializedDecodable
[src]

impl<T> Encodable for T where
    T: UseSpecializedEncodable + ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> WithConstness for T[src]