wasmer_wasix::state::linker

Struct Linker

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pub struct Linker {
    linker_state: Arc<RwLock<LinkerState>>,
    instance_group_state: Arc<Mutex<Option<InstanceGroupState>>>,
    dl_operation_pending: Arc<AtomicBool>,
}
Expand description

The linker is responsible for loading and linking dynamic modules at runtime, and managing the shared memory and indirect function table. Each linker instance represents a specific instance group. Cloning a linker instance does not create a new instance group though; the clone will refer to the same group as the original.

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§linker_state: Arc<RwLock<LinkerState>>§instance_group_state: Arc<Mutex<Option<InstanceGroupState>>>§dl_operation_pending: Arc<AtomicBool>

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impl Linker

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pub fn new( main_module: &Module, store: &mut StoreMut<'_>, memory: Option<Memory>, func_env: &mut WasiFunctionEnv, stack_size: u64, ) -> Result<(Self, LinkedMainModule), LinkError>

Creates a new linker for the given main module. The module is expected to be a PIE executable. Imports for the module will be fulfilled, so that it can start running, and a Linker instance is returned which can then be used for the loading/linking of further side modules.

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pub fn create_instance_group( &self, parent_ctx: &mut FunctionEnvMut<'_, WasiEnv>, store: &mut StoreMut<'_>, func_env: &mut WasiFunctionEnv, ) -> Result<(Self, LinkedMainModule), LinkError>

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pub fn shutdown_instance_group( &self, ctx: &mut FunctionEnvMut<'_, WasiEnv>, ) -> Result<(), LinkError>

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pub fn load_module( &self, module_path: impl AsRef<Path>, library_path: &[impl AsRef<Path>], ctx: &mut FunctionEnvMut<'_, WasiEnv>, ) -> Result<ModuleHandle, LinkError>

Loads a side module from the given path, linking it against the existing module tree and instantiating it. Symbols from the module can then be retrieved by calling Linker::resolve_export.

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pub fn resolve_export( &self, ctx: &mut FunctionEnvMut<'_, WasiEnv>, module_handle: Option<ModuleHandle>, symbol: &str, ) -> Result<ResolvedExport, ResolveError>

Resolves an export from the module corresponding to the given module handle. Only functions and globals can be resolved.

If the symbol is a global, the returned value will be the absolute address of the data corresponding to that global within the shared linear memory.

If it’s a function, it’ll be placed into the indirect function table, which creates a “function pointer” that can be used from WASM code.

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pub fn is_handle_valid( &self, handle: ModuleHandle, ctx: &mut FunctionEnvMut<'_, WasiEnv>, ) -> Result<bool, LinkError>

Trait Implementations§

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impl Clone for Linker

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fn clone(&self) -> Linker

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Linker

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl Freeze for Linker

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impl RefUnwindSafe for Linker

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impl Send for Linker

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impl Sync for Linker

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impl Unpin for Linker

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impl UnwindSafe for Linker

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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Writes data to out indicating that a T is niched.
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