Struct FeedbackVector 

pub struct FeedbackVector {
    pub function_id: u16,
    pub slots: HashMap<usize, FeedbackSlot>,
    pub generation: u32,
}

Per-function feedback vector: maps bytecode offsets to IC slots.

Fields

function_id: u16

slots: HashMap<usize, FeedbackSlot>

generation: u32

Implementations

impl FeedbackVector

pub fn new(function_id: u16) -> Self

Creates an empty feedback vector with generation 0.

pub fn rebase(&mut self, base_offset: usize)

Rebase slot keys by subtracting base_offset.

The interpreter records feedback at absolute bytecode IPs, but the JIT compiles sub-programs with 0-based instruction indices. This method remaps slots so the JIT can look up feedback by local offset.

Slots with offsets below base_offset are dropped (they belong to a different function or the program preamble).

pub fn merge_at_offset(&mut self, other: &FeedbackVector, offset: usize)

Merge another feedback vector’s slots into this one at a given offset.

Used when inlining a callee: the callee’s feedback slots are mapped into the outer function’s sub-program index space by adding offset to each slot key.

pub fn record_call(&mut self, offset: usize, target_function_id: u16)

Records a call target at the given bytecode offset.

pub fn record_property( &mut self, offset: usize, schema_id: u64, field_idx: u16, field_type_tag: u16, receiver_kind: u8, )

Records a property access at the given bytecode offset.

receiver_kind: 0 = TypedObject (schema guard), 1 = HashMap (shape guard).

pub fn record_arithmetic(&mut self, offset: usize, left_tag: u8, right_tag: u8)

Records arithmetic operand types at the given bytecode offset.

pub fn record_method( &mut self, offset: usize, receiver_kind: u8, method_name_id: u32, handler_ptr: usize, )

Records a method dispatch at the given bytecode offset.

pub fn get_slot(&self, offset: usize) -> Option<&FeedbackSlot>

Retrieves the feedback slot at the given bytecode offset.

pub fn is_monomorphic(&self, offset: usize) -> bool

Returns true if the slot at the given offset is in Monomorphic state.

pub fn reset(&mut self)

Clears all slots and increments the generation counter.

pub fn slot_count(&self) -> usize

Number of active IC slots in this vector.

pub fn monomorphic_ratio(&self) -> f64

Fraction of IC slots that are monomorphic (0.0 to 1.0).

Used by the TierManager to decide whether feedback quality is sufficient to warrant optimizing JIT compilation. A high ratio (>0.7) suggests the function has stable types worth specializing.

Trait Implementations

impl Clone for FeedbackVector

fn clone(&self) -> FeedbackVector

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FeedbackVector

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

Formats the value using the given formatter.