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ea6c18c5e2
`function nan() { return /* expression to compute NaN */ }` may not return the same implementation-distinguishable NaN value before and after JIT compilation.
69 lines
2.0 KiB
JavaScript
69 lines
2.0 KiB
JavaScript
// Copyright (C) 2016 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-ordinary-object-internal-methods-and-internal-slots-defineownproperty-p-desc
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description: >
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Replaces value field even if they pass in the SameValue algorithm, including
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distinct NaN values
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info: |
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This test does not compare the actual byte values, instead it simply checks that
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the value is some valid NaN encoding.
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---
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Previously, this test compared the "value" field using the SameValue
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algorithm (thereby ignoring distinct NaN values)
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---
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[[DefineOwnProperty]] (P, Desc)
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Return ? OrdinaryDefineOwnProperty(O, P, Desc).
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#sec-ordinarydefineownproperty
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OrdinaryDefineOwnProperty ( O, P, Desc )
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1. Let current be ? O.[[GetOwnProperty]](P).
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2. Let extensible be O.[[Extensible]].
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3. Return ValidateAndApplyPropertyDescriptor(O, P, extensible, Desc,
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current).
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#sec-validateandapplypropertydescriptor
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ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current )
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...
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7. Else if IsDataDescriptor(current) and IsDataDescriptor(Desc) are both true,
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then
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a. If current.[[Configurable]] is false and current.[[Writable]] is false,
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then
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...
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...
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9. If O is not undefined, then
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a. For each field of Desc that is present, set the corresponding attribute
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of the property named P of object O to the value of the field.
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10. Return true.
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#sec-isnan-number
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NOTE: A reliable way for ECMAScript code to test if a value X is a NaN is
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an expression of the form X !== X. The result will be true if and only
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if X is a NaN.
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includes: [nans.js]
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---*/
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var len = NaNs.length;
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for (var idx = 0; idx < len; ++idx) {
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for (var jdx = 0; jdx < len; ++jdx) {
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var a = {};
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a.prop = NaNs[idx];
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a.prop = NaNs[jdx];
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assert(
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a.prop !== a.prop,
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`Object property value reassigned to NaN produced by (index=${idx}) results in a valid NaN`
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);
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}
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}
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