Re: [xml] Possible memory leak in extension functions

[Matt Sergeant <matt sergeant org>]

On Tue, 18 Feb 2003, Daniel Veillard wrote:

>   if, on an XPATH_NODESET object you set obj->boolval to 1, then
> assuming also that you have groupped the nodes built for that nodeset
> back into a container node, then setting obj->user to that tree will
> in effect free up the whole tree when the nodeset is deallocated.

Unfortunately I have no idea what you mean when you say "groupped the
nodes ...". Do you have a API I can look at?

> Or
> if that user field isn't set the xmlXPathFreeValueTree() will do the
> deallocation for all objects referenced.

I tried that and it didn't work, maybe because of the below note?

>   But ... if the inner XPath computation leads to references to those
> nodes then serious troubles may result from this. The key point is that
> libxml2 XPath does not control the life of the referenced objects,
> only the controlling layer does. And yes extension functions and
> Result Value Trees have made my life miserable for a while, due
> to those allocation problems.

Even though I didn't fully understand this paragraph, it sounds scary ;-)

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