[Webkit-unassigned] [Bug 193912] [JSC] Repeat string created from Array.prototype.join() take too much memory

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193912

--- Comment #3 from Guillaume Emont <guijemont at igalia.com> ---
The first idea I'm currently exploring is to change fastJoin() in ArrayPrototype.cpp so that if the array is uninitialized (I think that's equivalent to indexingType() == ArrayType), we call String.prototype.repeat().

That's a relatively quick fix that should help in this specific test case, though I'm still curious to understand why a string of 10M chars seems to take 485MB of memory (or at least we reserve that much, according to massif). That's an average of 48.5 bytes per char, I think we could do better, even if it was a totally random string.

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