[JSC] Implement (Shared)ArrayBuffer.prototype.byteLength

[Yusuke Suzuki]

...

[Yusuke Suzuki]

https://tc39.github.io/ecma262/#sec-get-arraybuffer.prototype.bytelength

[Yusuke Suzuki]

We already have SharedArrayBuffer. So when implementing ArrayBuffer.prototype.byteLength, we should refer to the updated one in SharedArrayBuffer spec.

[Yusuke Suzuki]

http://tc39.github.io/ecmascript_sharedmem/shmem.html#StructuredData.SharedArrayBuffer.prototype.get_byteLength

[Radar WebKit Bug Importer]

<rdar://problem/30273638>

[JF Bastien]

This seems to be the one reason we're not at 100% in this:
 http://kangax.github.io/compat-table/es2016plus/

Probably worth doing, it's simple.

[Yusuke Suzuki]

Start working on this.

[Yusuke Suzuki]

Created attachment 301078 [details]
Patch

[Saam Barati]

Comment on attachment 301078 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=301078&action=review

r=me

> JSTests/stress/array-buffer-byte-length.js:27
> +    shouldBe(arrayBuffer.byteLength, 42);
> +    shouldBe(sharedArrayBuffer.byteLength, 500);

Can you also add a test where HasOwnProperty(buffer, "byteLength") is false?

> JSTests/stress/array-buffer-byte-length.js:45
> +    shouldThrow(() => {
> +        Object.getOwnPropertyDescriptor(ArrayBuffer.prototype, 'byteLength').get.call(sharedArrayBuffer);
> +    }, `TypeError: Receiver should not be a shared array buffer`);
> +
> +    shouldThrow(() => {
> +        Object.getOwnPropertyDescriptor(SharedArrayBuffer.prototype, 'byteLength').get.call(arrayBuffer);
> +    }, `TypeError: Receiver should be a shared array buffer`);

Can you also add tests for the other assertions:
- !thisValue.isObject()
- !thisValue.arrayBuffer()

[Yusuke Suzuki]

Comment on attachment 301078 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=301078&action=review

Thanks!

>> JSTests/stress/array-buffer-byte-length.js:27
>> +    shouldBe(sharedArrayBuffer.byteLength, 500);
> 
> Can you also add a test where HasOwnProperty(buffer, "byteLength") is false?

Added.

>> JSTests/stress/array-buffer-byte-length.js:45
>> +    }, `TypeError: Receiver should be a shared array buffer`);
> 
> Can you also add tests for the other assertions:
> - !thisValue.isObject()
> - !thisValue.arrayBuffer()

Added.

[Yusuke Suzuki]

Committed r212196: <http://trac.webkit.org/changeset/212196>