Struct EntityMeta 

pub struct EntityMeta {
    pub offset: u32,
    pub len: u32,
    pub save_level: u16,
    pub flags: u8,
    pub created_after_save: u32,
}

Metadata for one entity in an arena store.

Fields

offset: u32

Offset into the backing store’s data vec.

len: u32

Allocated capacity (number of elements/bytes).

save_level: u16

Save level when created or last COW-copied.

flags: u8

Bit 0: is_global, Bit 1: gc_mark (reserved for future use), Bit 2: cow_backup.

created_after_save: u32

Save ID that was active when this entity was created (0 = before any save). Used for invalidrestore: entities with created_after_save >= target_save_id are “newer than the snapshot being restored.”

Implementations

impl EntityMeta

pub fn is_global(&self) -> bool

Check if this entity is in global VM.

pub fn set_global(&mut self, global: bool)

Set the global flag.

pub fn is_cow_backup(&self) -> bool

Whether this entity is a copy-on-write backup rather than live data.

cow_copy allocates one of these to hold a composite’s pre-mutation contents so restore can swap them back. It is never reachable from PostScript in either state: before the restore it holds the snapshot, after it holds the discarded post-save data. Whole-arena sweeps that reason about reachability — see crate::vm_audit — must skip it.

pub fn set_cow_backup(&mut self)

Mark this entity as a copy-on-write backup.

Trait Implementations

impl Clone for EntityMeta

fn clone(&self) -> EntityMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EntityMeta

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

Formats the value using the given formatter.