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36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
// Copyright (C) 2021 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-dataview-buffer-byteoffset-bytelength
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description: >
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The view's offset may equal the underlying buffer's byte length if it is
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modified during retrieval of the NewTarget's prototype.
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features: [resizable-arraybuffer]
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---*/
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// If the host chooses to throw as allowed by the specification, the observed
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// behavior will be identical to the case where `ArrayBuffer.prototype.resize`
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// has not been implemented. The following assertion prevents this test from
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// passing in runtimes which have not implemented the method.
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assert.sameValue(typeof ArrayBuffer.prototype.resize, 'function');
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var buffer = new ArrayBuffer(3, {maxByteLength: 3});
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var expectedByteLength;
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var newTarget = function() {}.bind(null);
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Object.defineProperty(newTarget, 'prototype', {
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get: function() {
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try {
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buffer.resize(2);
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expectedByteLength = 0;
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} catch (error) {
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expectedByteLength = 1;
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}
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}
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});
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var result = Reflect.construct(DataView, [buffer, 2], newTarget);
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assert.sameValue(result.constructor, DataView);
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assert.sameValue(result.byteLength, expectedByteLength);
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