Struct Value 

pub struct Value(/* private fields */);

A NaN-boxed JavaScript value. ABI-identical to a u64, so *mut Value arrays and Completion fields carry it with no wrapping.

Implementations

impl Value

pub const CANON_NAN: u64 = CANON_NAN

The canonical positive quiet NaN, 0x7ff8_0000_0000_0000.

pub const UNDEFINED: Value

undefined.

pub const NULL: Value

null.

pub const HOLE: Value

The array/TDZ hole.

pub const UNINITIALIZED: Value

The uninitialized register-slot sentinel written by the frame prologue.

pub const FALSE: Value

false.

pub const TRUE: Value

true.

pub const fn boolean(value: bool) -> Value

Boxes a boolean (boolPayload).

pub const fn int32(value: u32) -> Value

Boxes a 32-bit integer (int32Payload, upper half zero).

pub const fn heap_ref(id: SlotId) -> Value

Boxes a validated heap reference (packSlot).

pub fn number(value: f64) -> Value

Encodes a double. Every NaN is canonicalized to CANON_NAN, so the result never collides with the boxed range (canonicalizeNaN).

pub const fn from_bits(bits: u64) -> Value

Reinterprets a raw 64-bit ABI word as a Value. The wire word is taken verbatim; use Value::decode to interpret it.

pub const fn to_bits(self) -> u64

The raw 64-bit ABI word.

pub const fn is_number(self) -> bool

Whether the word is a non-boxed arithmetic double.

pub const fn is_uninitialized(self) -> bool

Whether the word is exactly the uninitialized sentinel. This is the hot check the frame prologue and GC scan rely on.

pub const fn decode(self) -> Option<Decoded>

Interprets the word per the tag-specific payload rules (decode). Returns None for a boxed word whose payload is malformed for its tag.

pub fn as_f64(self) -> Option<f64>

The double value, when the word is a non-boxed number.

pub const fn as_int32(self) -> Option<u32>

The integer, when the word is a well-formed boxed int32.

pub const fn as_bool(self) -> Option<bool>

The boolean, when the word is a well-formed boxed boolean.

pub const fn as_heap_ref(self) -> Option<SlotId>

The heap slot, when the word is a well-formed boxed reference.

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Value

impl Debug for Value

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

Formats the value using the given formatter.

impl Eq for Value

impl Hash for Value

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 PartialEq for Value

fn eq(&self, other: &Value) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Value