Function wasmer_c_api::wasm_c_api::instance::wasm_instance_exports

source · 
#[no_mangle]
pub unsafe extern "C" fn wasm_instance_exports(
    instance: &wasm_instance_t,
    out: &mut wasm_extern_vec_t
)
Expand description

Gets the exports of the instance.

Example

int main() {
    // Create the engine and the store.
    wasm_engine_t* engine = wasm_engine_new();
    wasm_store_t* store = wasm_store_new(engine);

    // Create a WebAssembly module from a WAT definition.
    wasm_byte_vec_t wat;
    wasmer_byte_vec_new_from_string(
        &wat,
        "(module\n"
        "  (func (export \"function\") (param i32 i64))\n"
        "  (global (export \"global\") i32 (i32.const 7))\n"
        "  (table (export \"table\") 0 funcref)\n"
        "  (memory (export \"memory\") 1))"
    );
    wasm_byte_vec_t wasm;
    wat2wasm(&wat, &wasm);

    // Create the module.
    wasm_module_t* module = wasm_module_new(store, &wasm);

    // Instantiate the module.
    wasm_extern_vec_t imports = WASM_EMPTY_VEC;
    wasm_trap_t* trap = NULL;

    wasm_instance_t* instance = wasm_instance_new(store, module, &imports, &trap);
    assert(instance);

    // Read the exports.
    wasm_extern_vec_t exports;
    wasm_instance_exports(instance, &exports);

    // We have 4 of them.
    assert(exports.size == 4);

    // The first one is a function. Use `wasm_extern_as_func`
    // to go further.
    assert(wasm_extern_kind(exports.data[0]) == WASM_EXTERN_FUNC);

    // The second one is a global. Use `wasm_extern_as_global` to
    // go further.
    assert(wasm_extern_kind(exports.data[1]) == WASM_EXTERN_GLOBAL);

    // The third one is a table. Use `wasm_extern_as_table` to
    // go further.
    assert(wasm_extern_kind(exports.data[2]) == WASM_EXTERN_TABLE);

    // The fourth one is a memory. Use `wasm_extern_as_memory` to
    // go further.
    assert(wasm_extern_kind(exports.data[3]) == WASM_EXTERN_MEMORY);

    // Free everything.
    wasm_extern_vec_delete(&exports);
    wasm_instance_delete(instance);
    wasm_module_delete(module);
    wasm_byte_vec_delete(&wasm);
    wasm_byte_vec_delete(&wat);
    wasm_store_delete(store);
    wasm_engine_delete(engine);

    return 0;
}

To go further: