Skip to content
Permalink
9bfb9ba527
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
 
 
Cannot retrieve contributors at this time
59 lines (44 sloc) 1.48 KB
'use strict';
var GetIntrinsic = require('get-intrinsic');
var $RangeError = GetIntrinsic('%RangeError%');
var $TypeError = GetIntrinsic('%TypeError%');
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 table60 = {
__proto__: null,
$Int8Array: 1,
$Uint8Array: 1,
$Uint8ClampedArray: 1,
$Int16Array: 2,
$Uint16Array: 2,
$Int32Array: 4,
$Uint32Array: 4,
$BigInt64Array: 8,
$BigUint64Array: 8,
$Float32Array: 4,
$Float64Array: 8
};
// 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 $RangeError('index out of range'); // step 5
}
var arrayTypeName = whichTypedArray(typedArray); // step 6
var elementSize = table60['$' + arrayTypeName]; // step 7
var offset = typedArrayByteOffset(typedArray); // step 8
return (accessIndex * elementSize) + offset; // step 9
};