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test/js-native-api/test_function/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "test_function",
+      "sources": [
+        "test_function.c"
+      ]
+    }
+  ]
+}

test/js-native-api/test_function/test.js

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+'use strict';
+// Flags: --expose-gc
+
+const common = require('../../common');
+const assert = require('assert');
+
+// Testing api calls for function
+const test_function = require(`./build/${common.buildType}/test_function`);
+
+function func1() {
+  return 1;
+}
+assert.strictEqual(test_function.TestCall(func1), 1);
+
+function func2() {
+  console.log('hello world!');
+  return null;
+}
+assert.strictEqual(test_function.TestCall(func2), null);
+
+function func3(input) {
+  return input + 1;
+}
+assert.strictEqual(test_function.TestCall(func3, 1), 2);
+
+function func4(input) {
+  return func3(input);
+}
+assert.strictEqual(test_function.TestCall(func4, 1), 2);
+
+assert.strictEqual(test_function.TestName.name, 'Name');
+assert.strictEqual(test_function.TestNameShort.name, 'Name_');
+
+let tracked_function = test_function.MakeTrackedFunction(common.mustCall());
+assert(!!tracked_function);
+tracked_function = null;
+global.gc();
+
+assert.deepStrictEqual(test_function.TestCreateFunctionParameters(), {
+  envIsNull: 'Invalid argument',
+  nameIsNull: 'napi_ok',
+  cbIsNull: 'Invalid argument',
+  resultIsNull: 'Invalid argument',
+});
+
+assert.throws(
+  () => test_function.TestBadReturnExceptionPending(),
+  {
+    code: 'throwing exception',
+    name: 'Error',
+  },
+);

test/js-native-api/test_function/test_function.c

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+#include <js_native_api.h>
+#include "../common.h"
+#include "../entry_point.h"
+
+static napi_value TestCreateFunctionParameters(napi_env env,
+                                               napi_callback_info info) {
+  napi_status status;
+  napi_value result, return_value;
+
+  NODE_API_CALL(env, napi_create_object(env, &return_value));
+
+  status = napi_create_function(NULL,
+                                "TrackedFunction",
+                                NAPI_AUTO_LENGTH,
+                                TestCreateFunctionParameters,
+                                NULL,
+                                &result);
+
+  add_returned_status(env,
+                      "envIsNull",
+                      return_value,
+                      "Invalid argument",
+                      napi_invalid_arg,
+                      status);
+
+  napi_create_function(env,
+                       NULL,
+                       NAPI_AUTO_LENGTH,
+                       TestCreateFunctionParameters,
+                       NULL,
+                       &result);
+
+  add_last_status(env, "nameIsNull", return_value);
+
+  napi_create_function(env,
+                       "TrackedFunction",
+                       NAPI_AUTO_LENGTH,
+                       NULL,
+                       NULL,
+                       &result);
+
+  add_last_status(env, "cbIsNull", return_value);
+
+  napi_create_function(env,
+                       "TrackedFunction",
+                       NAPI_AUTO_LENGTH,
+                       TestCreateFunctionParameters,
+                       NULL,
+                       NULL);
+
+  add_last_status(env, "resultIsNull", return_value);
+
+  return return_value;
+}
+
+static napi_value TestCallFunction(napi_env env, napi_callback_info info) {
+  size_t argc = 10;
+  napi_value args[10];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NODE_API_ASSERT(env, argc > 0, "Wrong number of arguments");
+
+  napi_valuetype valuetype0;
+  NODE_API_CALL(env, napi_typeof(env, args[0], &valuetype0));
+
+  NODE_API_ASSERT(env, valuetype0 == napi_function,
+      "Wrong type of arguments. Expects a function as first argument.");
+
+  napi_value* argv = args + 1;
+  argc = argc - 1;
+
+  napi_value global;
+  NODE_API_CALL(env, napi_get_global(env, &global));
+
+  napi_value result;
+  NODE_API_CALL(env, napi_call_function(env, global, args[0], argc, argv, &result));
+
+  return result;
+}
+
+static napi_value TestFunctionName(napi_env env, napi_callback_info info) {
+  return NULL;
+}
+
+static void finalize_function(napi_env env, void* data, void* hint) {
+  napi_ref ref = data;
+
+  // Retrieve the JavaScript undefined value.
+  napi_value undefined;
+  NODE_API_CALL_RETURN_VOID(env, napi_get_undefined(env, &undefined));
+
+  // Retrieve the JavaScript function we must call.
+  napi_value js_function;
+  NODE_API_CALL_RETURN_VOID(env, napi_get_reference_value(env, ref, &js_function));
+
+  // Call the JavaScript function to indicate that the generated JavaScript
+  // function is about to be gc-ed.
+  NODE_API_CALL_RETURN_VOID(env,
+      napi_call_function(env, undefined, js_function, 0, NULL, NULL));
+
+  // Destroy the persistent reference to the function we just called so as to
+  // properly clean up.
+  NODE_API_CALL_RETURN_VOID(env, napi_delete_reference(env, ref));
+}
+
+static napi_value MakeTrackedFunction(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value js_finalize_cb;
+  napi_valuetype arg_type;
+
+  // Retrieve and validate from the arguments the function we will use to
+  // indicate to JavaScript that the function we are about to create is about to
+  // be gc-ed.
+  NODE_API_CALL(env,
+      napi_get_cb_info(env, info, &argc, &js_finalize_cb, NULL, NULL));
+  NODE_API_ASSERT(env, argc == 1, "Wrong number of arguments");
+  NODE_API_CALL(env, napi_typeof(env, js_finalize_cb, &arg_type));
+  NODE_API_ASSERT(env, arg_type == napi_function, "Argument must be a function");
+
+  // Dynamically create a function.
+  napi_value result;
+  NODE_API_CALL(env,
+      napi_create_function(
+          env, "TrackedFunction", NAPI_AUTO_LENGTH, TestFunctionName, NULL,
+          &result));
+
+  // Create a strong reference to the function we will call when the tracked
+  // function is about to be gc-ed.
+  napi_ref js_finalize_cb_ref;
+  NODE_API_CALL(env,
+      napi_create_reference(env, js_finalize_cb, 1, &js_finalize_cb_ref));
+
+  // Attach a finalizer to the dynamically created function and pass it the
+  // strong reference we created in the previous step.
+  NODE_API_CALL(env,
+      napi_wrap(
+          env, result, js_finalize_cb_ref, finalize_function, NULL, NULL));
+
+  return result;
+}
+
+static napi_value TestBadReturnExceptionPending(napi_env env, napi_callback_info info) {
+  napi_throw_error(env, "throwing exception", "throwing exception");
+
+  // addons should only ever return a valid napi_value even if an
+  // exception occurs, but we have seen that the C++ wrapper
+  // with exceptions enabled sometimes returns an invalid value
+  // when an exception is thrown. Test that we ignore the return
+  // value then an exception is pending. We use 0xFFFFFFFF as a value
+  // that should never be a valid napi_value and node seems to
+  // crash if it is not ignored indicating that it is indeed invalid.
+  return (napi_value)(0xFFFFFFFFF);
+}
+
+EXTERN_C_START
+napi_value Init(napi_env env, napi_value exports) {
+  napi_value fn1;
+  NODE_API_CALL(env, napi_create_function(
+      env, NULL, NAPI_AUTO_LENGTH, TestCallFunction, NULL, &fn1));
+
+  napi_value fn2;
+  NODE_API_CALL(env, napi_create_function(
+      env, "Name", NAPI_AUTO_LENGTH, TestFunctionName, NULL, &fn2));
+
+  napi_value fn3;
+  NODE_API_CALL(env, napi_create_function(
+      env, "Name_extra", 5, TestFunctionName, NULL, &fn3));
+
+  napi_value fn4;
+  NODE_API_CALL(env,
+      napi_create_function(
+          env, "MakeTrackedFunction", NAPI_AUTO_LENGTH, MakeTrackedFunction,
+          NULL, &fn4));
+
+  napi_value fn5;
+  NODE_API_CALL(env,
+      napi_create_function(
+          env, "TestCreateFunctionParameters", NAPI_AUTO_LENGTH,
+          TestCreateFunctionParameters, NULL, &fn5));
+
+  napi_value fn6;
+  NODE_API_CALL(env,
+      napi_create_function(
+          env, "TestBadReturnExceptionPending", NAPI_AUTO_LENGTH,
+          TestBadReturnExceptionPending, NULL, &fn6));
+
+  NODE_API_CALL(env, napi_set_named_property(env, exports, "TestCall", fn1));
+  NODE_API_CALL(env, napi_set_named_property(env, exports, "TestName", fn2));
+  NODE_API_CALL(env,
+      napi_set_named_property(env, exports, "TestNameShort", fn3));
+  NODE_API_CALL(env,
+      napi_set_named_property(env, exports, "MakeTrackedFunction", fn4));
+
+  NODE_API_CALL(env,
+      napi_set_named_property(
+          env, exports, "TestCreateFunctionParameters", fn5));
+
+  NODE_API_CALL(env,
+      napi_set_named_property(
+          env, exports, "TestBadReturnExceptionPending", fn6));
+
+  return exports;
+}
+EXTERN_C_END