[Webkit-unassigned] [Bug 75610] New: push/shift fifo may consume excessive memory
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Jan 5 01:05:48 PST 2012
https://bugs.webkit.org/show_bug.cgi?id=75610
Summary: push/shift fifo may consume excessive memory
Product: WebKit
Version: 528+ (Nightly build)
Platform: Unspecified
OS/Version: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: barraclough at apple.com
Array object commonly store data in a vector, consisting of a portion that is in use, a pre-capacity (m_indexBias) and a post-capacity (the delta between m_length and m_vectorLength). Calls to shift with grow the pre-capacity, and the current algorithm for increaseVectorLength (used by push, or [[Put]]) will never shrink the pre-capacity, so a push/shift fifo may consume an inordinate amount of memory, whilst having a relatively small active length.
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