deps: update V8 to 7.1.302.28

PR-URL: https://github.com/nodejs/node/pull/23423
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/deps/v8/test/mjsunit/harmony/async-await-optimization.js b/deps/v8/test/mjsunit/harmony/async-await-optimization.js
new file mode 100644
index 0000000000..b24e541916
--- /dev/null
+++ b/deps/v8/test/mjsunit/harmony/async-await-optimization.js
@@ -0,0 +1,124 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-await-optimization
+
+// test basic interleaving
+(function () {
+  const actual = [];
+  const expected = [ 'await', 1, 'await', 2 ];
+  const iterations = 2;
+
+  async function pushAwait() {
+    actual.push('await');
+  }
+
+  async function callAsync() {
+    for (let i = 0; i < iterations; i++) {
+      await pushAwait();
+    }
+    return 0;
+  }
+
+  function checkAssertions() {
+    assertArrayEquals(expected, actual,
+      'Async/await and promises should be interleaved.');
+  }
+
+  assertPromiseResult((async() => {
+    callAsync();
+
+    return new Promise(function (resolve) {
+      actual.push(1);
+      resolve();
+    }).then(function () {
+      actual.push(2);
+    }).then(checkAssertions);
+  })());
+})();
+
+// test async generators
+(function () {
+  const actual = [];
+  const expected = [ 'await', 1, 'await', 2 ];
+  const iterations = 2;
+
+  async function pushAwait() {
+    actual.push('await');
+  }
+
+  async function* callAsync() {
+    for (let i = 0; i < iterations; i++) {
+      await pushAwait();
+    }
+    return 0;
+  }
+
+  function checkAssertions() {
+    assertArrayEquals(expected, actual,
+      'Async/await and promises should be interleaved when using async generators.');
+  }
+
+  assertPromiseResult((async() => {
+    callAsync().next();
+
+    return new Promise(function (resolve) {
+      actual.push(1);
+      resolve();
+    }).then(function () {
+      actual.push(2);
+    }).then(checkAssertions);
+  })());
+})();
+
+// test yielding from async generators
+(function () {
+  const actual = [];
+  const expected = [
+    'Promise: 6',
+    'Promise: 5',
+    'Await: 3',
+    'Promise: 4',
+    'Promise: 3',
+    'Await: 2',
+    'Promise: 2',
+    'Promise: 1',
+    'Await: 1',
+    'Promise: 0'
+  ];
+  const iterations = 3;
+
+  async function* naturalNumbers(start) {
+    let current = start;
+    while (current > 0) {
+      yield Promise.resolve(current--);
+    }
+  }
+
+  async function trigger() {
+    for await (const num of naturalNumbers(iterations)) {
+      actual.push('Await: ' + num);
+    }
+  }
+
+  async function checkAssertions() {
+    assertArrayEquals(expected, actual,
+      'Async/await and promises should be interleaved when yielding.');
+  }
+
+  async function countdown(counter) {
+    actual.push('Promise: ' + counter);
+    if (counter > 0) {
+      return Promise.resolve(counter - 1).then(countdown);
+    } else {
+      await checkAssertions();
+    }
+  }
+
+  assertPromiseResult((async() => {
+    trigger();
+
+    return countdown(iterations * 2);
+  })());
+})();