787929 - JavaScript: The delete operator creates a memory leak.

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect)

Description

[Geverges Oleg]

In some cases, the operator delete, create a memory leak. In the attached file contains a short code leak.
JavaScript is a feature or a bug yet?
And if a little restructure data leakage will not.
The case of the diversion structure is as follows:
testedObject = {
    item_1 : {
        obj : {....}
    },
    item_2 : ...
    ....
    .....
}

delete testedObject[ 'item_' + i ].obj;

The case where there is no leakage:
testedObject = {
    obj : {
        item_1 : {....},
        item_2 : ...
          ....
          .....
    }
}

delete testedObject.obj[ 'item_' + i ];

Comment 1

[Geverges Oleg]

Attachment: File containing the leak.

Comment 2

[Geverges Oleg]

Attachment: File no leakage

Comment 3

[Boris Zbarsky [:bzbarsky]]

Where are you seeing the memory leak?

When you delete different properties on different objects, they can no longer share property information, so they get unique property descriptors.  So you would expect to see more memory usage.  But what exactly makes you think this is a leak?