Struct wasmtime_runtime::InstanceHandle

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pub struct InstanceHandle { /* private fields */ }

Expand description

A handle holding an Instance of a WebAssembly module.

Implementations§

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impl InstanceHandle

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pub unsafe fn from_vmctx(vmctx: *mut VMContext) -> Self

Create a new InstanceHandle pointing at the instance pointed to by the given VMContext pointer.

Safety

This is unsafe because it doesn’t work on just any VMContext, it must be a VMContext allocated as part of an Instance.

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pub fn vmctx(&self) -> &VMContext

Return a reference to the vmctx used by compiled wasm code.

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pub fn vmctx_ptr(&self) -> *mut VMContext

Return a raw pointer to the vmctx used by compiled wasm code.

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pub fn module(&self) -> &Arc<Module>

Return a reference to a module.

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pub fn get_exported_func(&mut self, export: FuncIndex) -> ExportFunction

Lookup a function by index.

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pub fn get_exported_global(&mut self, export: GlobalIndex) -> ExportGlobal

Lookup a global by index.

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pub fn get_exported_memory(&mut self, export: MemoryIndex) -> ExportMemory

Lookup a memory by index.

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pub fn get_exported_table(&mut self, export: TableIndex) -> ExportTable

Lookup a table by index.

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pub fn get_export_by_index(&mut self, export: EntityIndex) -> Export

Lookup an item with the given index.

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pub fn exports(&self) -> Iter<'_, String, EntityIndex>

Return an iterator over the exports of this instance.

Specifically, it provides access to the key-value pairs, where the keys are export names, and the values are export declarations which can be resolved lookup_by_declaration.

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pub fn host_state(&self) -> &dyn Any

Return a reference to the custom state attached to this instance.

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pub fn get_defined_memory(&mut self, index: DefinedMemoryIndex) -> *mut Memory

Get a memory defined locally within this module.

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pub unsafe fn table_index( &mut self, table: &VMTableDefinition ) -> DefinedTableIndex

Return the table index for the given VMTableDefinition in this instance.

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pub fn get_defined_table(&mut self, index: DefinedTableIndex) -> *mut Table

Get a table defined locally within this module.

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pub fn get_defined_table_with_lazy_init( &mut self, index: DefinedTableIndex, range: impl Iterator<Item = u32> ) -> *mut Table

Get a table defined locally within this module, lazily initializing the given range first.

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pub fn store(&self) -> *mut dyn Store

Returns the Store pointer that was stored on creation

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pub unsafe fn set_store(&mut self, store: *mut dyn Store)

Configure the *mut dyn Store internal pointer after-the-fact.

This is provided for the original Store itself to configure the first self-pointer after the original Box has been initialized.

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pub unsafe fn clone(&self) -> InstanceHandle

Returns a clone of this instance.

This is unsafe because the returned handle here is just a cheap clone of the internals, there’s no lifetime tracking around its validity. You’ll need to ensure that the returned handles all go out of scope at the same time.

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pub fn initialize( &mut self, module: &Module, is_bulk_memory: bool ) -> Result<()>

Performs post-initialization of an instance after its handle has been creqtaed and registered with a store.

Failure of this function means that the instance still must persist within the store since failure may indicate partial failure, or some state could be referenced by other instances.

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pub fn wasm_fault(&self, addr: usize) -> Option<WasmFault>

Attempts to convert from the host addr specified to a WebAssembly based address recorded in WasmFault.

This method will check all linear memories that this instance contains to see if any of them contain addr. If one does then Some is returned with metadata about the wasm fault. Otherwise None is returned and addr doesn’t belong to this instance.