Function assert_Instance

test/fixtures/wpt/wasm/jsapi/assertions.js:35–82

(instance, expected_exports)

globalThis.assert_exported_function = assert_exported_function;

function assert_Instance(instance, expected_exports) {
  assert_equals(Object.getPrototypeOf(instance), WebAssembly.Instance.prototype,
                "prototype");
  assert_true(Object.isExtensible(instance), "extensible");

  assert_equals(instance.exports, instance.exports, "exports should be idempotent");
  const exports = instance.exports;

  assert_equals(Object.getPrototypeOf(exports), null, "exports prototype");
  assert_false(Object.isExtensible(exports), "extensible exports");
  assert_array_equals(Object.keys(exports), Object.keys(expected_exports), "matching export keys");
  for (const [key, expected] of Object.entries(expected_exports)) {
    const property = Object.getOwnPropertyDescriptor(exports, key);
    assert_equals(typeof property, "object", `${key} should be present`);
    assert_false(property.writable, `${key}: writable`);
    assert_true(property.enumerable, `${key}: enumerable`);
    assert_false(property.configurable, `${key}: configurable`);
    const actual = property.value;
    assert_true(Object.isExtensible(actual), `${key}: extensible`);

    switch (expected.kind) {
    case "function":
      assert_exported_function(actual, expected, `value of ${key}`);
      break;
    case "global":
      assert_equals(Object.getPrototypeOf(actual), WebAssembly.Global.prototype,
                    `value of ${key}: prototype`);
      assert_equals(actual.value, expected.value, `value of ${key}: value`);
      assert_equals(actual.valueOf(), expected.value, `value of ${key}: valueOf()`);
      break;
    case "memory":
      assert_equals(Object.getPrototypeOf(actual), WebAssembly.Memory.prototype,
                    `value of ${key}: prototype`);
      assert_equals(Object.getPrototypeOf(actual.buffer), ArrayBuffer.prototype,
                    `value of ${key}: prototype of buffer`);
      assert_equals(actual.buffer.byteLength, 0x10000 * expected.size, `value of ${key}: size of buffer`);
      const array = new Uint8Array(actual.buffer);
      assert_equals(array[0], 0, `value of ${key}: first element of buffer`);
      assert_equals(array[array.byteLength - 1], 0, `value of ${key}: last element of buffer`);
      break;
    case "table":
      assert_equals(Object.getPrototypeOf(actual), WebAssembly.Table.prototype,
                    `value of ${key}: prototype`);
      assert_equals(actual.length, expected.length, `value of ${key}: length of table`);
      break;
    }
  }
}
globalThis.assert_Instance = assert_Instance;

function assert_WebAssemblyInstantiatedSource(actual, expected_exports={}) {