message: Add emscripten imports conditionally
diff: @@ -64,25 +64,30 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
  .map_err(|err| format!("Can't convert from wast to wasm: {:?}", err))?;
  }
  - // TODO: We should instantiate after compilation, so we provide the
  - // emscripten environment conditionally based on the module
  - let import_object = apis::generate_emscripten_env();
  -
  let isa = webassembly::get_isa();
  debug!("webassembly - creating module");
  let module = webassembly::compile(wasm_binary).map_err(|err| format!("Can't create the WebAssembly module: {}", err))?;
  + let is_emscripten = apis::is_emscripten_module(&module);
  +
  let instance_options = webassembly::InstanceOptions {
  mock_missing_imports: true,
  mock_missing_globals: true,
  mock_missing_tables: true,
  - use_emscripten: apis::is_emscripten_module(&module),
  + use_emscripten: is_emscripten,
  show_progressbar: true,
  isa: isa,
  };
  + let import_object = if is_emscripten {
  + apis::generate_emscripten_env()
  + }
  + else {
  + webassembly::ImportObject::new()
  + };
  +
  debug!("webassembly - creating instance");
  let mut instance = webassembly::Instance::new(
  &module,
  