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43 lines
1.3 KiB
43 lines
1.3 KiB
'use strict'; |
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var $RangeError = require('es-errors/range'); |
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var $TypeError = require('es-errors/type'); |
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var ToIndex = require('./ToIndex'); |
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var TypedArrayElementSize = require('./TypedArrayElementSize'); |
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var TypedArrayLength = require('./TypedArrayLength'); |
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var isTypedArrayWithBufferWitnessRecord = require('../helpers/records/typed-array-with-buffer-witness-record'); |
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var typedArrayByteOffset = require('typed-array-byte-offset'); |
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// https://262.ecma-international.org/15.0/#sec-validateatomicaccess |
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module.exports = function ValidateAtomicAccess(taRecord, requestIndex) { |
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if (!isTypedArrayWithBufferWitnessRecord(taRecord)) { |
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throw new $TypeError('Assertion failed: `taRecord` must be a TypedArray With Buffer Witness Record'); |
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} |
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var length = TypedArrayLength(taRecord); // step 1 |
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var accessIndex = ToIndex(requestIndex); // step 2 |
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/* |
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// this assertion can never be reached |
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if (!(accessIndex >= 0)) { |
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throw new $TypeError('Assertion failed: accessIndex >= 0'); // step 4 |
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} |
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*/ |
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if (accessIndex >= length) { |
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throw new $RangeError('index out of range'); // step 4 |
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} |
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var typedArray = taRecord['[[Object]]']; // step 5 |
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var elementSize = TypedArrayElementSize(typedArray); // step 6 |
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var offset = typedArrayByteOffset(typedArray); // step 7 |
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return (accessIndex * elementSize) + offset; // step 8 |
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};
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