Struct Runtime 

pub struct Runtime { /* private fields */ }

State for batching operations and object storage. Every evaluation is a batch - it may just have one operation.

Uses a free-list strategy for heap ID allocation to stay in sync with JS heap. Also stores exported Rust structs and callback functions.

Implementations

impl Runtime

pub fn get_next_heap_id(&mut self) -> u64

Get the next heap ID for placeholder allocation. Uses free-list strategy: reuses freed IDs first, then allocates new ones.

pub fn get_next_placeholder_id(&mut self) -> u64

Get the next heap ID for a batched return value placeholder. This also tracks the reserved placeholder count so JS can skip these IDs during nested callback allocations.

pub fn get_next_borrow_id(&mut self) -> u64

Get the next borrow ID from the borrow stack (indices 1-127). The borrow stack grows downward from JSIDX_OFFSET (128) toward 1. Panics if the borrow stack overflows (more than 127 borrowed refs in one operation).

pub fn push_borrow_frame(&mut self)

Push a borrow frame before a nested operation that may use borrowed refs. This saves the current borrow stack pointer so we can restore it later.

pub fn pop_borrow_frame(&mut self)

Pop a borrow frame after a nested operation completes. This restores the borrow stack pointer to where it was before the nested operation.

pub fn release_heap_id(&mut self, id: u64) -> Option<u64>

Release a heap ID back to the free-list and queue it for JS drop.