Add support for computed property names in object literals

test/mjsunit/object-literal-computed-names.js

+// Copyright 2014 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.
+
+// Test computed properties syntax.

[Michael Starzinger, 2014/06/13 08:14:19]

This file should definitely go into the "harmony" or one of the "esN"
sub-directories.

[wingo, 2014/06/16 08:32:27]

Done.

+
+// Flags: --harmony-symbols --harmony-strings
+
+function assertObjectEquals(expected, actual) {
+    var expected_props = Object.getOwnPropertyNames(expected);
+    var actual_props = Object.getOwnPropertyNames(actual);
+    expected_props += Object.getOwnPropertySymbols(expected);
+    actual_props += Object.getOwnPropertySymbols(actual);
+
+    assertEquals(expected_props.length, actual_props.length);
+    for (var i = 0; i < expected_props.length; i++) {
+        var prop = expected_props[i];
+        assertEquals(prop, actual_props[i]);
+        assertEquals(expected[prop], actual[prop]);
+    }
+}
+
+function preparse(str, strict) {
+    // Trigger the preparser by fooling it into thinking that the
+    // function is really big.

[marja, 2014/06/13 14:10:37]

This is not lazily parsed (i.e., parsed with PreParser), see
https://codereview.chromium.org/329413002/ for explanation why.

Pls verify for realz that PreParser gets invoked when you think it is (you
probably cannot verify it from the outside, but you can verify it by inspecting
what the code does).

Also, pls add tests ("RunParserSyncTest") in test-parsing (see
TEST(InvalidLeftHandSide) for an example) to verify that Parser and PreParser
accept the same language and produce the same errors.

+    var buffer = '/* ' + ' '.repeat(4096) + '*/';
+    var body = (strict ? '"use strict"; ' : '') + 'return ' + buffer + str;
+    return Function(body)();
+}
+
+function parse(str, strict) {
+    var indirect_eval = eval;
+    var body = (strict ? '"use strict"; ' : '') + '(' + str + ')';
+    return indirect_eval(body);
+}
+
+function test(expected, str) {
+    assertObjectEquals(expected, parse(str, true));
+    assertObjectEquals(expected, parse(str, false));
+    assertObjectEquals(expected, preparse(str, true));
+    assertObjectEquals(expected, preparse(str, false));
+}
+
+var sym = Symbol();
+var expected_with_sym = {};
+expected_with_sym[sym] = 'ohai';
+
+test({foo: 42},          "{['foo']: 42}");
+test({foo: 10},          "{['foo']: 42, foo: 10}");
+test({foo: 42},          "{foo: 10, ['foo']: 42}");
+test({foo: 42, bar: 35}, "{foo: 10, ['foo']: 42, bar: 35}");
+test({foo: 42, bar: 35}, "{foo: 10, bar: 35, ['foo']: 42}");
+test({bar: 35, foo: 42}, "{bar: 35, foo: 10, ['foo']: 42}");
+test({bar: 35, foo: 10}, "{bar: 35, ['foo']: 42, foo: 10}");
+test({bar: 35, foo: 10}, "{['bar']: 35, ['foo']: 42, foo: 10}");
+test({bar: 35, foo: 42}, "{['bar']: 35, foo: 10, ['foo']: 42}");
+test({foo: 42},          "{foo: 10, [1 ? 'foo' : 'bar']: 42}");
+test({foo: 10, bar: 42}, "{foo: 10, [0 ? 'foo' : 'bar']: 42}");
+test(expected_with_sym,  "{[sym]: 'ohai'}");
+test(expected_with_sym,  "{[1 ? sym : 'foo']: 'ohai'}");
+test({foo: 'ohai'},      "{[0 ? sym : 'foo']: 'ohai'}");
+test({foo: 42},          "{['foo']: 10, get foo() { return 42 }}");
+test({foo: 10},          "{get foo() { return 42 }, ['foo']: 10}");
+
+var test_proto = {};
+var test_obj = {['__proto__']: test_proto};
+assertEquals(Object.prototype, Object.getPrototypeOf(test_obj));
+assertTrue(test_obj.hasOwnProperty('__proto__'));
+assertEquals(test_proto, test_obj.__proto__);