Subj : Re: JS_GetArrayLength() crashing (garbage collection issue)
To   : netscape.public.mozilla.jseng
From : smaraux
Date : Fri Feb 25 2005 02:23 am

Brendan Eich <brendan@meer.net> wrote in message news:<421E72C5.6070509@meer.net>...
> sebastien maraux wrote:
> 
> > 	JS_AddRoot(pJSContext, pDataHolder->pChildrenArray);
> 
> You need to pass &pDataHolder->pChildrenArray -- see the API docs and 
> many other postings (google groups is useful to find these) on this.
> 
> You should also compile with DEBUG defined, in which case you should be 
> seeint JS_ASSERTs about roots pointing outside the GC heap, etc.
> 
> /be

OK, thanks.

I now get another issue :
I am adding each children of my pDataHolder->pChildrenArray to root.

A children is typically added with
JSObject *localObj = JSConstructObject(...my objectClass...);
JS_AddRoot(context, &localObj);
jsval localVal = OBJECT_TO_JSVAL(localObj);
JS_SetElement(Context, pDataHolder, (jsint) u4Index, &localVal );

But (I guess that) as it is local, localObj is being deleted, causing
a bit later a JS_GC call to crash.

I would like to add real content of the array (element) to root
instead of localObj (and I would like to be able to do so for double,
string and other gcthing too). Is there a mean to do that ?

On the other case, I will have to keep two references to my object and
maintain two different arrays (one from array, another from a basic
array of void pointers for ex. for being able to keep pointer alive),
which is a great lost of space.

Last solution would be not to use JSArrays to do that, but a hand made
array instead allowing to do what I want (retrieving adress of each
element) ?

Thank you for your answer

.