Function main

examples/multi.c:62–160

}

int main() {
  // Initialize.
  printf("Initializing...\n");
  wasm_engine_t *engine = wasm_engine_new();
  wasmtime_store_t *store = wasmtime_store_new(engine, NULL, NULL);
  wasmtime_context_t *context = wasmtime_store_context(store);

  // Load our input file to parse it next
  FILE *file = fopen("examples/multi.wat", "r");
  if (!file) {
    printf("> Error loading file!\n");
    return 1;
  }
  fseek(file, 0L, SEEK_END);
  size_t file_size = ftell(file);
  fseek(file, 0L, SEEK_SET);
  wasm_byte_vec_t wat;
  wasm_byte_vec_new_uninitialized(&wat, file_size);
  if (fread(wat.data, file_size, 1, file) != 1) {
    printf("> Error loading module!\n");
    return 1;
  }
  fclose(file);

  // Parse the wat into the binary wasm format
  wasm_byte_vec_t binary;
  wasmtime_error_t *error = wasmtime_wat2wasm(wat.data, wat.size, &binary);
  if (error != NULL)
    exit_with_error("failed to parse wat", error, NULL);
  wasm_byte_vec_delete(&wat);

  // Compile.
  printf("Compiling module...\n");
  wasmtime_module_t *module = NULL;
  error =
      wasmtime_module_new(engine, (uint8_t *)binary.data, binary.size, &module);
  if (error)
    exit_with_error("failed to compile module", error, NULL);
  wasm_byte_vec_delete(&binary);

  // Create external print functions.
  printf("Creating callback...\n");
  wasm_functype_t *callback_type =
      wasm_functype_new_2_2(wasm_valtype_new_i32(), wasm_valtype_new_i64(),
                            wasm_valtype_new_i64(), wasm_valtype_new_i32());
  wasmtime_func_t callback_func;
  wasmtime_func_new(context, callback_type, callback, NULL, NULL,
                    &callback_func);
  wasm_functype_delete(callback_type);

  // Instantiate.
  printf("Instantiating module...\n");
  wasmtime_extern_t imports[1];
  imports[0].kind = WASMTIME_EXTERN_FUNC;
  imports[0].of.func = callback_func;
  wasmtime_instance_t instance;
  wasm_trap_t *trap = NULL;
  error = wasmtime_instance_new(context, module, imports, 1, &instance, &trap);