Enum rustc_middle::mir::interpret::value::Scalar

pub enum Scalar<Tag = ()> {
    Int(ScalarInt),
    Ptr(Pointer<Tag>),
}

A Scalar represents an immediate, primitive value existing outside of a memory::Allocation. It is in many ways like a small chunk of a Allocation, up to 16 bytes in size. Like a range of bytes in an Allocation, a Scalar can either represent the raw bytes of a simple value or a pointer into another Allocation

Variants

Int(ScalarInt)

The raw bytes of a simple value.

Ptr(Pointer<Tag>)

A pointer into an Allocation. An Allocation in the memory module has a list of relocations, but a Scalar is only large enough to contain one, so we just represent the relocation and its associated offset together as a Pointer here.

Implementations

impl Scalar<()>

pub fn with_tag<Tag>(self, new_tag: Tag) -> Scalar<Tag>

Tag this scalar with new_tag if it is a pointer, leave it unchanged otherwise.

Used by MemPlace::replace_tag.

impl<'tcx, Tag> Scalar<Tag>

pub const ZST: Self

pub fn erase_tag(self) -> Scalar

Erase the tag from the scalar, if any.

Used by error reporting code to avoid having the error type depend on Tag.

pub fn null_ptr(cx: &impl HasDataLayout) -> Self

fn ptr_op(
    self,
    dl: &TargetDataLayout,
    f_int: impl FnOnce(u64) -> InterpResult<'tcx, u64>,
    f_ptr: impl FnOnce(Pointer<Tag>) -> InterpResult<'tcx, Pointer<Tag>>
) -> InterpResult<'tcx, Self>

pub fn ptr_offset(
    self,
    i: Size,
    cx: &impl HasDataLayout
) -> InterpResult<'tcx, Self>

pub fn ptr_wrapping_offset(self, i: Size, cx: &impl HasDataLayout) -> Self

pub fn ptr_signed_offset(
    self,
    i: i64,
    cx: &impl HasDataLayout
) -> InterpResult<'tcx, Self>

pub fn ptr_wrapping_signed_offset(self, i: i64, cx: &impl HasDataLayout) -> Self

pub fn from_bool(b: bool) -> Self

pub fn from_char(c: char) -> Self

pub fn try_from_uint(i: impl Into<u128>, size: Size) -> Option<Self>

pub fn from_uint(i: impl Into<u128>, size: Size) -> Self

pub fn from_u8(i: u8) -> Self

pub fn from_u16(i: u16) -> Self

pub fn from_u32(i: u32) -> Self

pub fn from_u64(i: u64) -> Self

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

pub fn try_from_int(i: impl Into<i128>, size: Size) -> Option<Self>

pub fn from_int(i: impl Into<i128>, size: Size) -> Self

pub fn from_i32(i: i32) -> Self

pub fn from_i64(i: i64) -> Self

pub fn from_machine_isize(i: i64, cx: &impl HasDataLayout) -> Self

pub fn from_f32(f: Single) -> Self

pub fn from_f64(f: Double) -> Self

pub fn to_bits_or_ptr(
    self,
    target_size: Size,
    cx: &impl HasDataLayout
) -> Result<u128, Pointer<Tag>>

This is very rarely the method you want! You should dispatch on the type and use force_bits/assert_bits/force_ptr/assert_ptr. This method only exists for the benefit of low-level memory operations as well as the implementation of the force_* methods.

fn to_bits(self, target_size: Size) -> InterpResult<'tcx, u128>

This method is intentionally private! It is just a helper for other methods in this file.

pub fn assert_bits(self, target_size: Size) -> u128

pub fn assert_int(self) -> ScalarInt

pub fn assert_ptr(self) -> Pointer<Tag>

pub fn is_bits(self) -> bool

Do not call this method! Dispatch based on the type instead.

pub fn is_ptr(self) -> bool

Do not call this method! Dispatch based on the type instead.

pub fn to_bool(self) -> InterpResult<'tcx, bool>

pub fn to_char(self) -> InterpResult<'tcx, char>

fn to_unsigned_with_bit_width(self, bits: u64) -> InterpResult<'static, u128>

pub fn to_u8(self) -> InterpResult<'static, u8>

Converts the scalar to produce an u8. Fails if the scalar is a pointer.

pub fn to_u16(self) -> InterpResult<'static, u16>

Converts the scalar to produce an u16. Fails if the scalar is a pointer.

pub fn to_u32(self) -> InterpResult<'static, u32>

Converts the scalar to produce an u32. Fails if the scalar is a pointer.

pub fn to_u64(self) -> InterpResult<'static, u64>

Converts the scalar to produce an u64. Fails if the scalar is a pointer.

pub fn to_u128(self) -> InterpResult<'static, u128>

Converts the scalar to produce an u128. Fails if the scalar is a pointer.

pub fn to_machine_usize(
    self,
    cx: &impl HasDataLayout
) -> InterpResult<'static, u64>

fn to_signed_with_bit_width(self, bits: u64) -> InterpResult<'static, i128>

pub fn to_i8(self) -> InterpResult<'static, i8>

Converts the scalar to produce an i8. Fails if the scalar is a pointer.

pub fn to_i16(self) -> InterpResult<'static, i16>

Converts the scalar to produce an i16. Fails if the scalar is a pointer.

pub fn to_i32(self) -> InterpResult<'static, i32>

Converts the scalar to produce an i32. Fails if the scalar is a pointer.

pub fn to_i64(self) -> InterpResult<'static, i64>

Converts the scalar to produce an i64. Fails if the scalar is a pointer.

pub fn to_i128(self) -> InterpResult<'static, i128>

Converts the scalar to produce an i128. Fails if the scalar is a pointer.

pub fn to_machine_isize(
    self,
    cx: &impl HasDataLayout
) -> InterpResult<'static, i64>

pub fn to_f32(self) -> InterpResult<'static, Single>

pub fn to_f64(self) -> InterpResult<'static, Double>

Trait Implementations

impl<Tag: Clone> Clone for Scalar<Tag>

fn clone(&self) -> Scalar<Tag>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<Tag: Debug> Debug for Scalar<Tag>

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

Formats the value using the given formatter.

impl<'tcx, Tag, __D: TyDecoder<'tcx>> Decodable<__D> for Scalar<Tag> where
    Tag: Decodable<__D>, 

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

impl<Tag: Debug> Display for Scalar<Tag>

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

Formats the value using the given formatter.

impl<'tcx, Tag, __E: TyEncoder<'tcx>> Encodable<__E> for Scalar<Tag> where
    Tag: Encodable<__E>, 

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

impl<Tag> From<IeeeFloat<DoubleS>> for Scalar<Tag>

fn from(f: Double) -> Self

Performs the conversion.

impl<Tag> From<IeeeFloat<SingleS>> for Scalar<Tag>

fn from(f: Single) -> Self

Performs the conversion.

impl<Tag> From<Pointer<Tag>> for Scalar<Tag>

fn from(ptr: Pointer<Tag>) -> Self

Performs the conversion.

impl<'tcx> From<Scalar<()>> for ConstValue<'tcx>

fn from(s: Scalar) -> Self

Performs the conversion.

impl<Tag> From<Scalar<Tag>> for ScalarMaybeUninit<Tag>

fn from(s: Scalar<Tag>) -> Self

Performs the conversion.

impl<Tag> From<ScalarInt> for Scalar<Tag>

fn from(ptr: ScalarInt) -> Self

Performs the conversion.

impl<Tag: Hash> Hash for Scalar<Tag>

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, 

Feeds a slice of this type into the given Hasher.

impl<'__ctx, Tag> HashStable<StableHashingContext<'__ctx>> for Scalar<Tag> where
    Tag: HashStable<StableHashingContext<'__ctx>>, 

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

impl<Tag: Ord> Ord for Scalar<Tag>

fn cmp(&self, other: &Scalar<Tag>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl<Tag: PartialEq> PartialEq<Scalar<Tag>> for Scalar<Tag>

fn eq(&self, other: &Scalar<Tag>) -> bool

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

fn ne(&self, other: &Scalar<Tag>) -> bool

This method tests for !=.

impl<Tag: PartialOrd> PartialOrd<Scalar<Tag>> for Scalar<Tag>

fn partial_cmp(&self, other: &Scalar<Tag>) -> Option<Ordering>

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

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

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

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

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

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

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

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

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

impl<Tag: Copy> Copy for Scalar<Tag>

impl<Tag: Eq> Eq for Scalar<Tag>

impl<Tag> StructuralEq for Scalar<Tag>

impl<Tag> StructuralPartialEq for Scalar<Tag>

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.