Struct ObjectHeader 

pub struct ObjectHeader {
    pub shape: ShapeId,
    pub slots_start: u32,
    pub elements_start: u32,
    pub payload: u32,
    pub slots_log: u8,
    pub elements_log: u8,
    pub kind: ObjectKind,
    pub flags: u8,
}

One fixed-size record per object (20 bytes).

Fields

shape: ShapeId

slots_start: u32

elements_start: u32

payload: u32

Index into the kind’s side arena, or an inline payload: the array length, the parent scope.

slots_log: u8

elements_log: u8

kind: ObjectKind

flags: u8

Implementations

impl ObjectHeader

pub fn new( kind: ObjectKind, shape: ShapeId, slots: Range, elements: Range, payload: u32, flags: u8, ) -> Self

pub fn slots(&self) -> Range

The named property slots: always a power of two (ValueHeap::alloc_slots).

pub fn set_slots(&mut self, range: Range)

pub fn elements(&self) -> Range

pub fn set_elements(&mut self, range: Range)

pub fn has(&self, flag: u8) -> bool

Trait Implementations

impl Clone for ObjectHeader

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ObjectHeader

impl Debug for ObjectHeader

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

Formats the value using the given formatter.

impl Record for ObjectHeader

fn vacant() -> Self

The poison value written over a freed slot. It must own no heap memory.

fn extra_bytes(&self) -> usize

Bytes owned outside the arena slot (string contents, tables), counted toward the heap cap.