2018-11-22 15:29:55 +00:00
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// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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2019-04-24 22:19:13 +00:00
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// Flags: --harmony-object-from-entries
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2018-11-22 15:29:55 +00:00
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const fromEntries = Object.fromEntries;
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const ObjectPrototype = Object.prototype;
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const ObjectPrototypeHasOwnProperty = ObjectPrototype.hasOwnProperty;
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function hasOwnProperty(O, Name) {
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if (O === undefined || O === null) return false;
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return ObjectPrototypeHasOwnProperty.call(O, Name);
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}
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let test = {
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methodExists() {
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assertTrue(hasOwnProperty(Object, "fromEntries"));
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assertEquals("function", typeof Object.fromEntries);
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},
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methodLength() {
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assertEquals(1, Object.fromEntries.length);
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},
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methodName() {
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assertEquals("fromEntries", Object.fromEntries.name);
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},
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methodPropertyDescriptor() {
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let descriptor = Object.getOwnPropertyDescriptor(Object, "fromEntries");
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assertFalse(descriptor.enumerable);
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assertTrue(descriptor.configurable);
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assertTrue(descriptor.writable);
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assertEquals(descriptor.value, Object.fromEntries);
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},
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exceptionIfNotCoercible() {
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assertThrows(() => fromEntries(null), TypeError);
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assertThrows(() => fromEntries(undefined), TypeError);
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},
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exceptionIfNotIterable() {
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let nonIterable = [1, 2, 3, 4, 5];
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Object.defineProperty(nonIterable, Symbol.iterator, { value: undefined });
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assertThrows(() => fromEntries(nonIterable), TypeError);
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},
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exceptionIfGetIteratorThrows() {
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let iterable = [1, 2, 3, 4, 5];
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class ThrewDuringGet {};
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Object.defineProperty(iterable, Symbol.iterator, {
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get() { throw new ThrewDuringGet(); }
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});
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assertThrows(() => fromEntries(iterable), ThrewDuringGet);
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},
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exceptionIfCallIteratorThrows() {
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let iterable = [1, 2, 3, 4, 5];
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class ThrewDuringCall {};
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iterable[Symbol.iterator] = function() {
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throw new ThrewDuringCall();
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}
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assertThrows(() => fromEntries(iterable), ThrewDuringCall);
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},
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exceptionIfIteratorNextThrows() {
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let iterable = [1, 2, 3, 4, 5];
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class ThrewDuringIteratorNext {}
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iterable[Symbol.iterator] = function() {
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return {
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next() { throw new ThrewDuringIteratorNext; },
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return() {
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throw new Error(
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"IteratorClose must not be performed if IteratorStep throws");
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},
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}
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}
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assertThrows(() => fromEntries(iterable), ThrewDuringIteratorNext);
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},
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exceptionIfIteratorCompleteThrows() {
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let iterable = [1, 2, 3, 4, 5];
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class ThrewDuringIteratorComplete {}
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iterable[Symbol.iterator] = function() {
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return {
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next() {
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return {
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get value() { throw new Error(
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"IteratorValue must not be performed before IteratorComplete");
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},
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get done() {
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throw new ThrewDuringIteratorComplete();
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}
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}
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throw new ThrewDuringIteratorNext;
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},
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return() {
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throw new Error(
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"IteratorClose must not be performed if IteratorStep throws");
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},
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}
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}
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assertThrows(() => fromEntries(iterable), ThrewDuringIteratorComplete);
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},
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exceptionIfEntryIsNotObject() {
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{
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// Fast path (Objects/Smis)
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let iterables = [[null], [undefined], [1], [NaN], [false], [Symbol()],
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[""]];
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for (let iterable of iterables) {
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assertThrows(() => fromEntries(iterable), TypeError);
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}
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}
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{
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// Fast path (Doubles)
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let iterable = [3.7, , , 3.6, 1.1, -0.4];
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assertThrows(() => fromEntries(iterable), TypeError);
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}
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{
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// Slow path
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let i = 0;
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let values = [null, undefined, 1, NaN, false, Symbol(), ""];
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let iterable = {
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[Symbol.iterator]() { return this; },
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next() {
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return {
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done: i >= values.length,
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value: values[i++],
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}
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},
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};
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for (let k = 0; k < values.length; ++k) {
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assertThrows(() => fromEntries(iterable), TypeError);
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}
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assertEquals({}, fromEntries(iterable));
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}
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},
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returnIfEntryIsNotObject() {
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// Only observable/verifiable in the slow path :(
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let i = 0;
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let didCallReturn = false;
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let values = [null, undefined, 1, NaN, false, Symbol(), ""];
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let iterable = {
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[Symbol.iterator]() { return this; },
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next() {
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return {
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done: i >= values.length,
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value: values[i++],
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}
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},
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return() { didCallReturn = true; throw new Error("Unused!"); }
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};
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for (let k = 0; k < values.length; ++k) {
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didCallReturn = false;
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assertThrows(() => fromEntries(iterable), TypeError);
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assertTrue(didCallReturn);
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}
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assertEquals({}, fromEntries(iterable));
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},
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returnIfEntryKeyAccessorThrows() {
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class ThrewDuringKeyAccessor {};
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let entries = [{ get 0() { throw new ThrewDuringKeyAccessor(); },
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get 1() { throw new Error("Unreachable!"); } }];
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let didCallReturn = false;
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let iterator = entries[Symbol.iterator]();
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iterator.return = function() {
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didCallReturn = true;
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throw new Error("Unused!");
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}
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assertThrows(() => fromEntries(iterator), ThrewDuringKeyAccessor);
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assertTrue(didCallReturn);
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},
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returnIfEntryKeyAccessorThrows() {
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class ThrewDuringValueAccessor {};
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let entries = [{ get 1() { throw new ThrewDuringValueAccessor(); },
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0: "key",
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}];
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let didCallReturn = false;
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let iterator = entries[Symbol.iterator]();
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iterator.return = function() {
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didCallReturn = true;
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throw new Error("Unused!");
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};
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assertThrows(() => fromEntries(iterator), ThrewDuringValueAccessor);
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assertTrue(didCallReturn);
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},
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returnIfKeyToStringThrows() {
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class ThrewDuringKeyToString {};
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let operations = [];
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let entries = [{
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get 0() {
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operations.push("[[Get]] key");
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return {
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toString() {
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operations.push("toString(key)");
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throw new ThrewDuringKeyToString();
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},
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valueOf() {
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operations.push("valueOf(key)");
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}
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};
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},
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get 1() {
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operations.push("[[Get]] value");
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return "value";
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},
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}];
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let iterator = entries[Symbol.iterator]();
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iterator.return = function() {
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operations.push("IteratorClose");
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throw new Error("Unused!");
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};
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assertThrows(() => fromEntries(iterator), ThrewDuringKeyToString);
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assertEquals([
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"[[Get]] key",
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"[[Get]] value",
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"toString(key)",
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"IteratorClose",
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], operations);
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},
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throwsIfIteratorValueThrows() {
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let iterable = [1, 2, 3, 4, 5];
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class ThrewDuringIteratorValue {}
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iterable[Symbol.iterator] = function() {
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return {
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next() {
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return {
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get value() { throw new ThrewDuringIteratorValue(); },
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get done() { return false; }
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}
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throw new ThrewDuringIteratorNext;
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},
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return() {
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throw new Error(
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"IteratorClose must not be performed if IteratorStep throws");
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},
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}
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}
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assertThrows(() => fromEntries(iterable), ThrewDuringIteratorValue);
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},
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emptyIterable() {
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let iterables = [[], new Set(), new Map()];
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for (let iterable of iterables) {
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let result = fromEntries(iterable);
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assertEquals({}, result);
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assertEquals(ObjectPrototype, result.__proto__);
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}
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},
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keyOrderFastPath() {
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let entries = [
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["z", 1],
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["y", 2],
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["x", 3],
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["y", 4],
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[100, 0],
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];
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let result = fromEntries(entries);
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assertEquals({
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100: 0,
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z: 1,
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y: 4,
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x: 3,
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}, result);
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assertEquals(["100", "z", "y", "x"], Object.keys(result));
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},
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keyOrderSlowPath() {
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let entries = [
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["z", 1],
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["y", 2],
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["x", 3],
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["y", 4],
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[100, 0],
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];
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let i = 0;
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let iterable = {
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[Symbol.iterator]() { return this; },
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next() {
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return {
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done: i >= entries.length,
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value: entries[i++]
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}
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},
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return() { throw new Error("Unreachable!"); }
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};
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let result = fromEntries(iterable);
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assertEquals({
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100: 0,
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z: 1,
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y: 4,
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x: 3,
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}, result);
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assertEquals(["100", "z", "y", "x"], Object.keys(result));
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},
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doesNotUseIteratorForKeyValuePairFastCase() {
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class Entry {
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constructor(k, v) {
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this[0] = k;
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this[1] = v;
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}
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get [Symbol.iterator]() {
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throw new Error("Should not load Symbol.iterator from Entry!");
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}
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}
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function e(k, v) { return new Entry(k, v); }
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let entries = [e(100, 0), e('z', 1), e('y', 2), e('x', 3), e('y', 4)];
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let result = fromEntries(entries);
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assertEquals({
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100: 0,
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z: 1,
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y: 4,
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x: 3,
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}, result);
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},
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doesNotUseIteratorForKeyValuePairSlowCase() {
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class Entry {
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constructor(k, v) {
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this[0] = k;
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this[1] = v;
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}
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get [Symbol.iterator]() {
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throw new Error("Should not load Symbol.iterator from Entry!");
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}
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}
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function e(k, v) { return new Entry(k, v); }
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let entries = new Set(
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[e(100, 0), e('z', 1), e('y', 2), e('x', 3), e('y', 4)]);
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let result = fromEntries(entries);
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assertEquals({
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100: 0,
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z: 1,
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y: 4,
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x: 3,
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}, result);
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},
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createDataPropertyFastCase() {
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Object.defineProperty(ObjectPrototype, "property", {
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configurable: true,
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get() { throw new Error("Should not invoke getter on prototype!"); },
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set() { throw new Error("Should not invoke setter on prototype!"); },
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});
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let entries = [["property", "value"]];
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let result = fromEntries(entries);
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assertEquals(result.property, "value");
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delete ObjectPrototype.property;
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},
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createDataPropertySlowCase() {
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Object.defineProperty(ObjectPrototype, "property", {
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configurable: true,
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get() { throw new Error("Should not invoke getter on prototype!"); },
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set() { throw new Error("Should not invoke setter on prototype!"); },
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});
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let entries = new Set([["property", "value"]]);
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let result = fromEntries(entries);
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assertEquals(result.property, "value");
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delete ObjectPrototype.property;
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},
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keyToPrimitiveMutatesArrayInFastCase() {
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let mySymbol = Symbol();
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let entries = [[0, 1], ["a", 2], [{
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[Symbol.toPrimitive]() {
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// The fast path should bail out if a key is a JSReceiver, otherwise
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// assumptions about the structure of the iterable can change. If the
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// fast path doesn't bail out, the 4th key would be "undefined".
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delete entries[3][0];
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entries[3].__proto__ = { 0: "shfifty", };
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return mySymbol;
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},
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}, 3], [3, 4]];
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let result = fromEntries(entries);
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assertEquals({
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0: 1,
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"a": 2,
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[mySymbol]: 3,
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"shfifty": 4,
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}, result);
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assertEquals(["0", "a", "shfifty", mySymbol], Reflect.ownKeys(result));
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},
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keyToStringMutatesArrayInFastCase() {
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let mySymbol = Symbol();
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let entries = [[mySymbol, 1], [0, 2], [{
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toString() {
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delete entries[3][0];
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entries[3].__proto__ = { 0: "shfifty", };
|
|
|
|
return "z";
|
|
|
|
},
|
|
|
|
valueOf() { throw new Error("Unused!"); }
|
|
|
|
}, 3], [3, 4]];
|
|
|
|
let result = fromEntries(entries);
|
|
|
|
assertEquals({
|
|
|
|
[mySymbol]: 1,
|
|
|
|
0: 2,
|
|
|
|
"z": 3,
|
|
|
|
"shfifty": 4,
|
|
|
|
}, result);
|
|
|
|
assertEquals(["0", "z", "shfifty", mySymbol], Reflect.ownKeys(result));
|
|
|
|
},
|
|
|
|
|
|
|
|
keyValueOfMutatesArrayInFastCase() {
|
|
|
|
let mySymbol = Symbol();
|
|
|
|
let entries = [[mySymbol, 1], ["z", 2], [{
|
|
|
|
toString: undefined,
|
|
|
|
valueOf() {
|
|
|
|
delete entries[3][0];
|
|
|
|
entries[3].__proto__ = { 0: "shfifty", };
|
|
|
|
return 0;
|
|
|
|
},
|
|
|
|
}, 3], [3, 4]];
|
|
|
|
let result = fromEntries(entries);
|
|
|
|
assertEquals({
|
|
|
|
[mySymbol]: 1,
|
|
|
|
"z": 2,
|
|
|
|
0: 3,
|
|
|
|
"shfifty": 4,
|
|
|
|
}, result);
|
|
|
|
assertEquals(["0", "z", "shfifty", mySymbol], Reflect.ownKeys(result));
|
|
|
|
},
|
|
|
|
}
|
|
|
|
|
|
|
|
for (let t of Reflect.ownKeys(test)) {
|
|
|
|
test[t]();
|
|
|
|
}
|