46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var $RangeError = require('es-errors/range');
|
||
|
|
var $TypeError = require('es-errors/type');
|
||
|
|
|
||
|
|
var ToIndex = require('./ToIndex');
|
||
|
|
|
||
|
|
var isTypedArray = require('is-typed-array');
|
||
|
|
var typedArrayByteOffset = require('typed-array-byte-offset');
|
||
|
|
var typedArrayLength = require('typed-array-length');
|
||
|
|
var whichTypedArray = require('which-typed-array');
|
||
|
|
|
||
|
|
var tableTAO = require('./tables/typed-array-objects');
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/12.0/#sec-validateatomicaccess
|
||
|
|
|
||
|
|
module.exports = function ValidateAtomicAccess(typedArray, requestIndex) {
|
||
|
|
if (!isTypedArray(typedArray)) {
|
||
|
|
throw new $TypeError('Assertion failed: `typedArray` must be a TypedArray'); // step 1
|
||
|
|
}
|
||
|
|
|
||
|
|
var length = typedArrayLength(typedArray); // step 2
|
||
|
|
|
||
|
|
var accessIndex = ToIndex(requestIndex); // step 3
|
||
|
|
|
||
|
|
/*
|
||
|
|
// this assertion can never be reached
|
||
|
|
if (!(accessIndex >= 0)) {
|
||
|
|
throw new $TypeError('Assertion failed: accessIndex >= 0'); // step 4
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (accessIndex >= length) {
|
||
|
|
throw new $RangeError('index out of range'); // step 5
|
||
|
|
}
|
||
|
|
|
||
|
|
var arrayTypeName = whichTypedArray(typedArray); // step 6
|
||
|
|
|
||
|
|
var taType = tableTAO.name['$' + arrayTypeName];
|
||
|
|
var elementSize = tableTAO.size['$' + taType]; // step 7
|
||
|
|
|
||
|
|
var offset = typedArrayByteOffset(typedArray); // step 8
|
||
|
|
|
||
|
|
return (accessIndex * elementSize) + offset; // step 9
|
||
|
|
};
|