Struct MemoryLimiter 

pub struct MemoryLimiter { /* private fields */ }

Per-store memory limiter.

Wired into Store::limiter so wasmtime rejects memory.grow past max_memory. Without this, configured memory caps would be silently ignored — the sandbox would have unbounded heap, which defeats the “self-contained module” guarantee.

Implementations

impl MemoryLimiter

pub const fn new(max_memory: usize) -> Self

Build a limiter that caps growth (and initial allocation) at max_memory bytes.

Trait Implementations

impl ResourceLimiter for MemoryLimiter

fn memory_growing( &mut self, _current: usize, desired: usize, _maximum: Option<usize>, ) -> Result<bool>

Notifies the resource limiter that an instance’s linear memory has been requested to grow.

fn table_growing( &mut self, _current: usize, desired: usize, _maximum: Option<usize>, ) -> Result<bool>

Notifies the resource limiter that an instance’s table has been requested to grow.

fn memory_grow_failed(&mut self, error: Error) -> Result<(), Error>

Notifies the resource limiter that growing a linear memory, permitted by the memory_growing method, has failed.

fn table_grow_failed(&mut self, error: Error) -> Result<(), Error>

Notifies the resource limiter that growing a linear memory, permitted by the table_growing method, has failed.

fn instances(&self) -> usize

The maximum number of instances that can be created for a Store.

fn tables(&self) -> usize

The maximum number of tables that can be created for a Store.

fn memories(&self) -> usize

The maximum number of linear memories that can be created for a Store