[webkit-dev] about hashmap staticDOMObjects

ZHOU Xiao-bo zhxb.ustc at gmail.com
Wed Apr 22 01:15:41 PDT 2009

oh, I got an idea:
Is it because these domobjects doesn't belong to a Document, so they can't
stored in

static NodePerDocMap& domNodesPerDocument()
    static NodePerDocMap staticDOMNodesPerDocument;
    return staticDOMNodesPerDocument;

2009/4/22 ZHOU Xiao-bo <zhxb.ustc at gmail.com>

> hi all:
>      I still don't understand the purpose of the HashMap:
> static DOMObjectMap& domObjects()
> {
>     // Don't use malloc here. Calling malloc from a mark function can
> deadlock.
>     static DOMObjectMap staticDOMObjects;
>     return staticDOMObjects;
> }
> what kind of DOMObjects should be stored in it? And why?
> I searched the source codes and I found that these classes below will do
> that:
> Document, Event, HTMLCollection, XMLHttpRequest, CanvasGradient,
> CanvasPattern, CanvasRenderingContext2D, DOMCoreException,
> DOMImplementation, DOMParser, EventException, History, NamedNodeMap,
> NodeFilter, NodeIterator, NodeList, Range, RangeException, TreeWalker,
> XMLHttpRequestException, XMLSerializer, Clipboard
> but what's the reason? Is it because these classes are essentially simple
> and just acting as a tool?
> thanks a lot
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