Struct ValueSlot 

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

A raw 8-byte value slot for TypedObject field storage.

Implementations

impl ValueSlot

pub fn from_typed_scalar(ts: TypedScalar) -> (Self, bool)

Create a ValueSlot from a TypedScalar.

Returns (slot, is_heap) — is_heap is always false for scalars since all scalar values fit in 8 bytes without heap allocation.

impl ValueSlot

pub fn from_number(n: f64) -> Self

Store a f64 as raw IEEE 754 bits.

pub fn from_int(i: i64) -> Self

Store an i64 as raw two’s complement bits. Full 64-bit range, no precision loss.

pub fn from_u64(v: u64) -> Self

Store a u64 directly. Only meaningful when the FieldType is known to be U64.

pub fn as_u64(&self) -> u64

Read as u64 (caller must know this slot is u64 type).

pub fn from_bool(b: bool) -> Self

Store a bool as 1/0.

pub fn none() -> Self

Store None as zero bits.

pub fn from_heap(value: HeapValue) -> Self

Store any HeapValue on the heap. The caller MUST set the corresponding bit in heap_mask so Drop knows to free this.

Without gc feature: allocates via Box (freed by drop_heap). With gc feature: allocates via GcHeap (freed by garbage collector).

pub fn as_f64(&self) -> f64

Read as f64 (caller must know this slot is f64 type).

pub fn as_i64(&self) -> i64

Read as i64 (caller must know this slot is i64 type).

pub fn as_bool(&self) -> bool

Read as bool (caller must know this slot is bool type).

pub fn as_heap_value(&self) -> &HeapValue

Read as heap HeapValue reference (caller must know this slot is a heap pointer). Returns a reference to the pointed-to HeapValue.

pub fn as_heap_nb(&self) -> ValueWord

Create a ValueWord directly from this heap slot (no intermediate conversion). Caller must know this slot is a heap pointer.

pub fn from_value_word(nb: &ValueWord) -> (Self, bool)

Store a ValueWord losslessly. For inline types (f64, i48, bool, none, unit, function, module_function), stores the raw NaN-boxed tag bits directly. For heap-tagged values, clones the HeapValue into a new Box. Returns (slot, is_heap) — caller must set the heap_mask bit if is_heap.

pub fn from_nanboxed(nb: &ValueWord) -> (Self, bool)

Backward-compatibility alias.

pub fn as_value_word(&self, is_heap: bool) -> ValueWord

Reconstruct a ValueWord from this slot. is_heap must match the value returned by from_value_word (i.e., whether heap_mask bit is set).

pub fn as_nanboxed(&self, is_heap: bool) -> ValueWord

Backward-compatibility alias.

pub fn raw(&self) -> u64

Raw bits for simple copy.

pub fn from_raw(bits: u64) -> Self

Construct from raw bits.

pub unsafe fn drop_heap(&mut self)

Drop the heap value. MUST only be called on heap slots.

Without gc feature: frees via Box deallocation. With gc feature: no-op (GC handles deallocation).

Safety

Caller must ensure this slot actually contains a valid heap pointer.

pub unsafe fn clone_heap(&self) -> Self

Clone a heap slot by cloning the pointed-to HeapValue into a new Box.

Without gc feature: deep clones into a new Box allocation. With gc feature: bitwise copy (GC tracks all references).

Safety

Caller must ensure this slot actually contains a valid heap pointer.

Trait Implementations

impl Clone for ValueSlot

fn clone(&self) -> ValueSlot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ValueSlot

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

Formats the value using the given formatter.

impl Copy for ValueSlot