#[repr(C)]
pub struct VMExternRefActivationsTable { /* private fields */ }
Expand description

A table that over-approximizes the set of VMExternRefs that any Wasm activation on this thread is currently using.

Under the covers, this is a simple bump allocator that allows duplicate entries. Deduplication happens at GC time.

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impl VMExternRefActivationsTable

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pub fn new() -> Self

Create a new VMExternRefActivationsTable.

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pub fn bump_capacity_remaining(&self) -> usize

Get the available capacity in the bump allocation chunk.

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pub fn try_insert(&mut self, externref: VMExternRef) -> Result<(), VMExternRef>

Try and insert a VMExternRef into this table.

This is a fast path that only succeeds when the bump chunk has the capacity for the requested insertion.

If the insertion fails, then the VMExternRef is given back. Callers may attempt a GC to free up space and try again, or may call insert_slow_path to infallibly insert the reference (potentially allocating additional space in the table to hold it).

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pub unsafe fn insert_with_gc( &mut self, externref: VMExternRef, module_info_lookup: &dyn ModuleInfoLookup, )

Insert a reference into the table, falling back on a GC to clear up space if the table is already full.

§Unsafety

The same as gc.

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pub fn insert_without_gc(&mut self, externref: VMExternRef)

Insert a reference into the table, without ever performing GC.

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pub fn set_gc_okay(&mut self, okay: bool) -> bool

Set whether it is okay to GC or not right now.

This is provided as a helper for enabling various debug-only assertions and checking places where the wasmtime-runtime user expects there not to be any GCs.

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fn into(self) -> U

Calls U::from(self).

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impl<T, U> TryFrom<U> for T
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type Error = Infallible

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Performs the conversion.
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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.