Web Inspector: array grouping does not work big sparse arrays

[Andrey Adaikin]

Patch to follow.

This test takes too much time since there is a linear array index iteration:

    var f = [];
    f[4294967294] = 4294967294;
    console.log("%O", f)

Now we will choose between array index iteration and object properties iteration for sparse arrays.

[Andrey Adaikin]

Created attachment 182747 [details]
Patch

[Andrey Adaikin]

Created attachment 182787 [details]
Patch

[Pavel Feldman]

Comment on attachment 182787 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=182787&action=review

> Source/WebCore/ChangeLog:8
> +        Now we will choose between array index iteration and object properties iteration for sparse arrays.

It is not clear from the test case how this helps.

> Source/WebCore/inspector/front-end/ObjectPropertiesSection.js:651
> +            if (toIndex - fromIndex < 250000) {

Magic number

> Source/WebCore/inspector/front-end/ObjectPropertiesSection.js:749
> +            var ownPropertyNames = Object.getOwnPropertyNames(this);

Looks like a lot of copypaste.

[Andrey Adaikin]

Comment on attachment 182787 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=182787&action=review

>> Source/WebCore/ChangeLog:8
>> +        Now we will choose between array index iteration and object properties iteration for sparse arrays.
> 
> It is not clear from the test case how this helps.

otherwise it times out.

>> Source/WebCore/inspector/front-end/ObjectPropertiesSection.js:651
>> +            if (toIndex - fromIndex < 250000) {
> 
> Magic number

done.

>> Source/WebCore/inspector/front-end/ObjectPropertiesSection.js:749
>> +            var ownPropertyNames = Object.getOwnPropertyNames(this);
> 
> Looks like a lot of copypaste.

Yes, but I don't know how to do better... (any ideas?)
These 2 functions are to be serialized to a string, thus if I extract a shared function, it should be also serialized to a string, passed as an argument to the original two, and evaluated back to the Function. I thought it's too much complicated to avoid (small) code dups.

[Andrey Adaikin]

Created attachment 182957 [details]
Patch

[Andrey Adaikin]

Created attachment 183172 [details]
Rebased

[WebKit Review Bot]

Comment on attachment 183172 [details]
Rebased

Clearing flags on attachment: 183172

Committed r140150: <http://trac.webkit.org/changeset/140150>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.