ceb7bd5943
Each LHS expression that contains an optional chain of some form is wrapped in an OptionalChain node. This root node allows us to use a single jump location for every individual item in the chain, improving the performance and simplifying the implementation. Bug: v8:9553 Change-Id: I678563928b2dbfd6200bff55801919d4fd816962 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1723359 Commit-Queue: Adam Klein <adamk@chromium.org> Reviewed-by: Adam Klein <adamk@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/master@{#63120}
119 lines
3.8 KiB
JavaScript
119 lines
3.8 KiB
JavaScript
// Copyright 2019 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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// Flags: --harmony-optional-chaining
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function shouldThrowSyntaxError(script) {
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let error;
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try {
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eval(script);
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} catch (e) {
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error = e;
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}
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if (!(error instanceof SyntaxError)) {
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throw new Error('Expected SyntaxError!');
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}
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}
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assertEquals(undefined?.valueOf(), undefined);
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assertEquals(null?.valueOf(), undefined);
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assertEquals(true?.valueOf(), true);
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assertEquals(false?.valueOf(), false);
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assertEquals(0?.valueOf(), 0);
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assertEquals(1?.valueOf(), 1);
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assertEquals(''?.valueOf(), '');
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assertEquals('hi'?.valueOf(), 'hi');
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assertEquals(({})?.constructor, Object);
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assertEquals(({ x: 'hi' })?.x, 'hi');
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assertEquals([]?.length, 0);
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assertEquals(['hi']?.length, 1);
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assertEquals(undefined?.['valueOf'](), undefined);
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assertEquals(null?.['valueOf'](), undefined);
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assertEquals(true?.['valueOf'](), true);
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assertEquals(false?.['valueOf'](), false);
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assertEquals(0?.['valueOf'](), 0);
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assertEquals(1?.['valueOf'](), 1);
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assertEquals(''?.['valueOf'](), '');
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assertEquals('hi'?.['valueOf'](), 'hi');
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assertEquals(({})?.['constructor'], Object);
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assertEquals(({ x: 'hi' })?.['x'], 'hi');
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assertEquals([]?.['length'], 0);
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assertEquals(['hi']?.[0], 'hi');
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assertEquals(undefined?.(), undefined);
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assertEquals(null?.(), undefined);
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assertThrows(() => true?.(), TypeError);
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assertThrows(() => false?.(), TypeError);
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assertThrows(() => 0?.(), TypeError);
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assertThrows(() => 1?.(), TypeError);
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assertThrows(() => ''?.(), TypeError);
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assertThrows(() => 'hi'?.(), TypeError);
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assertThrows(() => ({})?.(), TypeError);
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assertThrows(() => ({ x: 'hi' })?.(), TypeError);
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assertThrows(() => []?.(), TypeError);
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assertThrows(() => ['hi']?.(), TypeError);
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assertThrows(() => ({})?.a['b'], TypeError);
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assertEquals(({})?.a?.['b'], undefined);
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assertEquals(null?.a['b']().c, undefined);
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assertThrows(() => ({})?.['a'].b);
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assertEquals(({})?.['a']?.b, undefined);
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assertEquals(null?.['a'].b()['c'], undefined);
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assertThrows(() => (() => {})?.()(), TypeError);
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assertEquals((() => {})?.()?.(), undefined);
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assertEquals(null?.()().a['b'], undefined);
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assertEquals(delete undefined?.foo, true);
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assertEquals(delete null?.foo, true);
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assertEquals(delete undefined?.['foo'], true);
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assertEquals(delete null?.['foo'], true);
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assertEquals(delete undefined?.(), true);
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assertEquals(delete null?.(), true);
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assertEquals(undefined?.(...a), undefined);
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assertEquals(null?.(1, ...a), undefined);
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assertEquals(({}).a?.(...a), undefined);
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assertEquals(({ a: null }).a?.(...a), undefined);
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assertEquals(undefined?.(...a)?.(1, ...a), undefined);
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assertThrows(() => 5?.(...[]), TypeError);
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const o1 = { x: 0, y: 0, z() {} };
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assertEquals(delete o1?.x, true);
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assertEquals(o1.x, undefined);
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assertEquals(delete o1?.x, true);
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assertEquals(delete o1?.['y'], true);
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assertEquals(o1.y, undefined);
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assertEquals(delete o1?.['y'], true);
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assertEquals(delete o1.z?.(), true);
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shouldThrowSyntaxError('class C {} class D extends C { foo() { return super?.bar; } }');
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shouldThrowSyntaxError('class C {} class D extends C { foo() { return super?.["bar"]; } }');
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shouldThrowSyntaxError('class C {} class D extends C { constructor() { super?.(); } }');
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shouldThrowSyntaxError('const o = { C: class {} }; new o?.C();');
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shouldThrowSyntaxError('const o = { C: class {} }; new o?.["C"]();');
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shouldThrowSyntaxError('class C {} new C?.();');
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shouldThrowSyntaxError('function foo() { new?.target; }');
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shouldThrowSyntaxError('function tag() {} tag?.``;');
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shouldThrowSyntaxError('const o = { tag() {} }; o?.tag``;');
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const o2 = {
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count: 0,
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get x() {
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this.count += 1;
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return () => {};
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},
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};
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o2.x?.y;
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assertEquals(o2.count, 1);
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o2.x?.['y'];
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assertEquals(o2.count, 2);
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o2.x?.();
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assertEquals(o2.count, 3);
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assertEquals(true?.5:5, 0.5);
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