Enum rustc_middle::mir::interpret::value::ConstValue[][src]

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

Show fields

Fields of Slice

data: &'tcx Allocationstart: usizeend: usize
ByRef

A value not represented/representable by Scalar or Slice

Show fields

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_scalar_int(&self) -> Option<ScalarInt>[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: Ty<'tcx>
) -> Option<u128>
[src]

pub fn from_bool(b: bool) -> Self[src]

pub fn from_u64(i: u64) -> Self[src]

pub fn from_machine_usize(i: u64, cx: &impl HasDataLayout) -> Self[src]

Trait Implementations

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

fn clone(&self) -> ConstValue<'tcx>[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

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

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

Formats the value using the given formatter. Read more

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for ConstValue<'tcx>[src]

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>[src]

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for ConstValue<'tcx>[src]

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>[src]

impl<'tcx> From<Scalar<()>> for ConstValue<'tcx>[src]

fn from(s: Scalar) -> Self[src]

Performs the conversion.

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

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

Feeds this value into the given Hasher. Read more

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

Feeds a slice of this type into the given Hasher. Read more

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ConstValue<'tcx>[src]

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

impl<'a, 'tcx> Lift<'tcx> for ConstValue<'a>[src]

type Lifted = ConstValue<'tcx>

fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ConstValue<'tcx>>[src]

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

fn cmp(&self, other: &ConstValue<'tcx>) -> Ordering[src]

This method returns an Ordering between self and other. Read more

#[must_use]
fn max(self, other: Self) -> Self
1.21.0[src]

Compares and returns the maximum of two values. Read more

#[must_use]
fn min(self, other: Self) -> Self
1.21.0[src]

Compares and returns the minimum of two values. Read more

#[must_use]
fn clamp(self, min: Self, max: Self) -> Self
1.50.0[src]

Restrict a value to a certain interval. Read more

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

fn eq(&self, other: &ConstValue<'tcx>) -> bool[src]

This method tests for self and other values to be equal, and is used by ==. Read more

fn ne(&self, other: &ConstValue<'tcx>) -> bool[src]

This method tests for !=.

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

fn partial_cmp(&self, other: &ConstValue<'tcx>) -> Option<Ordering>[src]

This method returns an ordering between self and other values if one exists. Read more

#[must_use]
fn lt(&self, other: &Rhs) -> bool
1.0.0[src]

This method tests less than (for self and other) and is used by the < operator. Read more

#[must_use]
fn le(&self, other: &Rhs) -> bool
1.0.0[src]

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

#[must_use]
fn gt(&self, other: &Rhs) -> bool
1.0.0[src]

This method tests greater than (for self and other) and is used by the > operator. Read more

#[must_use]
fn ge(&self, other: &Rhs) -> bool
1.0.0[src]

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

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

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

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

impl<'tcx> StructuralPartialEq 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]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<'tcx, T> ArenaAllocatable<'tcx, ()> for T where
    T: Copy
[src]

pub fn allocate_on(Self, &'a Arena<'tcx>) -> &'a mut T[src]

pub fn allocate_from_iter(
    &'a Arena<'tcx>,
    impl IntoIterator<Item = T>
) -> &'a mut [T]

Notable traits for &'_ [u8]

impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]
[src]

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

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

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

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

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

pub fn from(t: T) -> T[src]

Performs the conversion.

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

pub fn into(self) -> U[src]

Performs the conversion.

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

type Error = !

pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T[src]

pub fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>[src]

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

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

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.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

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.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.

impl<T> WithConstness for T[src]

fn with_constness(self, constness: Constness) -> ConstnessAnd<Self>[src]

fn with_const(self) -> ConstnessAnd<Self>[src]

fn without_const(self) -> ConstnessAnd<Self>[src]

impl<'a, T> Captures<'a> for T where
    T: ?Sized
[src]