Struct wasmer_engine::ExportFunctionMetadata

pub struct ExportFunctionMetadata { /* fields omitted */ }

Extra metadata about ExportFunctions.

The metadata acts as a kind of manual virtual dispatch. We store the user-supplied WasmerEnv as a void pointer and have methods on it that have been adapted to accept a void pointer.

This struct owns the original host_env, thus when it gets dropped it calls the drop function on it.

Implementations

impl ExportFunctionMetadata

pub unsafe fn new(
    host_env: *mut c_void,
    import_init_function_ptr: Option<ImportInitializerFuncPtr>,
    host_env_clone_fn: fn(_: *mut c_void) -> *mut c_void,
    host_env_drop_fn: fn(_: *mut c_void)
) -> Self

Create an ExportFunctionMetadata type with information about the exported function.

Safety

• the host_env must be Send.
• all function pointers must work on any thread.

Trait Implementations

impl Debug for ExportFunctionMetadata

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

Formats the value using the given formatter.

impl Drop for ExportFunctionMetadata

fn drop(&mut self)

Executes the destructor for this type.

impl MemoryUsage for ExportFunctionMetadata

fn size_of_val(&self, visited: &mut dyn MemoryUsageTracker) -> usize

Returns the size of the referenced value in bytes.

impl PartialEq<ExportFunctionMetadata> for ExportFunctionMetadata

fn eq(&self, other: &ExportFunctionMetadata) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &ExportFunctionMetadata) -> bool

This method tests for !=.

impl Send for ExportFunctionMetadata

This can be Send because host_env comes from WasmerEnv which is Send. Therefore all operations should work on any thread.

impl StructuralPartialEq for ExportFunctionMetadata

impl Sync for ExportFunctionMetadata

This data may be shared across threads, drop is an unsafe function pointer, so care must be taken when calling it.