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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-typedarray-buffer-byteoffset-length
description: >
ToIndex(byteOffset) operations
info: |
22.2.4.5 TypedArray ( buffer [ , byteOffset [ , length ] ] )
This description applies only if the TypedArray function is called with at
least one argument and the Type of the first argument is Object and that
object has an [[ArrayBufferData]] internal slot.
...
7. Let offset be ? ToIndex(byteOffset).
8. If offset modulo elementSize ≠ 0, throw a RangeError exception.
...
includes: [testBigIntTypedArray.js]
features: [BigInt, TypedArray]
---*/
var buffer = new ArrayBuffer(16);
var obj1 = {
valueOf: function() {
return 8;
}
};
var obj2 = {
toString: function() {
return 8;
}
};
var items = [
[-0, 0, "-0"],
[obj1, 8, "object's valueOf"],
[obj2, 8, "object's toString"],
["", 0, "the Empty string"],
["0", 0, "string '0'"],
["8", 8, "string '8'"],
[false, 0, "false"],
[NaN, 0, "NaN"],
[null, 0, "null"],
[undefined, 0, "undefined"],
[0.1, 0, "0.1"],
[0.9, 0, "0.9"],
[8.1, 8, "8.1"],
[8.9, 8, "8.9"],
[-0.1, 0, "-0.1"],
[-0.99999, 0, "-0.99999"]
];
testWithBigIntTypedArrayConstructors(function(TA) {
items.forEach(function(item) {
var offset = item[0];
var expected = item[1];
var name = item[2];
var typedArray = new TA(buffer, offset);
assert.sameValue(typedArray.byteOffset, expected, name + " byteOffset");
assert.sameValue(typedArray.constructor, TA, name + " constructor");
assert.sameValue(
Object.getPrototypeOf(typedArray),
TA.prototype,
name + " prototype"
);
});
// Testing `true`. See step 8
if (TA.BYTES_PER_ELEMENT === 1) {
var typedArray = new TA(buffer, true);
assert.sameValue(typedArray.byteOffset, 1, "true => 1 byteOffset");
assert.sameValue(typedArray.constructor, TA, "true => 1 constructor");
assert.sameValue(
Object.getPrototypeOf(typedArray),
TA.prototype,
"true => 1 prototype"
);
} else {
assert.throws(RangeError, function() {
new TA(buffer, true);
}, "1 modulo elementSize ≠ 0, throws a RangeError");
}
});
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