Struct CallFrame 

pub struct CallFrame {

    pub fn_id: u32,
    pub ip: u32,
    pub bp: u32,
    pub local_count: u16,
    pub arena_mark: u32,
    pub yard_base: u32,
    pub yard_mark: u32,
    pub handoff_mark: u32,
    pub globals_dirty: bool,
    pub yard_dirty: bool,
    pub handoff_dirty: bool,
    pub thin: bool,
    pub parent_thin: bool,
}

Minimal call frame: 16 bytes of metadata, no closure/upvalue fields.

Fields

fn_id: u32

Index into CodeStore::functions.

ip: u32

Current instruction pointer (byte offset into FnChunk::code).

bp: u32

Base pointer: index into VM stack where this frame’s locals start.

local_count: u16

Number of local slots (params + local bindings).

arena_mark: u32

Arena length at function entry; allocations above this mark are local to the frame unless promoted on return/tail-call.

yard_base: u32

Yard length at function entry; reused TCO frames compact this suffix so loop-carried survivors do not accumulate across iterations.

yard_mark: u32

Current yard suffix owned by this frame iteration. Reused TCO frames may advance this mark so older carried survivors become the shared prefix for the next iteration.

handoff_mark: u32

Handoff length at function entry; ordinary returns compact this suffix so helper results can survive into the caller without polluting stable.

globals_dirty: bool

Whether this frame stored a young-region value into globals.

yard_dirty: bool

Whether ordinary returns introduced caller-yard survivors that should be pruned on the next tail-call boundary.

handoff_dirty: bool

Whether helper returns introduced handoff survivors that should be pruned on the next boundary of this frame.

thin: bool

Conservatively classified as cheap enough for a fast return path.

parent_thin: bool

Uses the caller young region as its allocation lane and skips ordinary-return handoff while it remains a pure wrapper frame.

Trait Implementations

impl Clone for CallFrame

fn clone(&self) -> CallFrame

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CallFrame

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

Formats the value using the given formatter.