53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
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// Copyright 2024 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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//
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// Flags: --allow-natives-syntax
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function foo() {
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let getter_call_count = 0;
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const obj = {};
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Object.defineProperty(obj, "prop_that_forces_dictionary_mode", {
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get() {
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// Make `obj` dictionary mode before returning.
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assertTrue(%HasFastProperties(this));
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this.x = 1;
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this.y = 2;
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delete this.x;
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delete this.y;
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assertFalse(%HasFastProperties(this));
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return 12;
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},
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enumerable: true
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});
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Object.defineProperty(obj, "prop_with_getter", {
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get() {
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getter_call_count++;
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return 42;
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},
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enumerable: true
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});
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assertTrue(%HasFastProperties(obj));
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// obj will start in fast mode, then:
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//
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// 1. prop_with_getter is accessed for the first variable
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// 2. own properties are walked for the rest parameter
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// 3. prop_that_forces_dictionary_mode forces obj to be dictionary mode
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// 4. the prop_with_getter property (now an accessor pair in the dictionary)
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// should be skipped and the getter shouldn't be called.
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let {prop_with_getter, ...props_excluding_getter} = obj;
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assertFalse(%HasFastProperties(obj));
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assertEquals(42, prop_with_getter);
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assertEquals({prop_that_forces_dictionary_mode: 12}, props_excluding_getter);
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assertEquals(1, getter_call_count);
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}
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%EnsureFeedbackVectorForFunction(foo);
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foo();
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