Hi Jeremy, On Wed, Dec 05, 2007 at 11:45:53PM +0000, Jeremy Henty wrote:
Dillo aborts with an assertion failure if you click to the right of an image that has a line all to itself. For example, go to http://www.thenation.com/doc/20071203/pollitt and click to the right of the "Continued" logo.
Great you are looking into that. It was next on my list...
What happens is that the DeepIterator constructor wants an iterator with non-widget content. If necessary it calls searchDownward and searchSideward until it finds one. Both these methods raise an assertion failure if the iterator already has non-widget content, so the content must be checked before calling *either* of them. However, DeepIterator checks the content before calling searchDownward but *not* before calling searchSideward . Effectively, the code assumes that if searchDownward fails then the content type won't have changed.
Unfortunately searchDownward can fail *and* change the content of the iterator to something non-widget. If this happens DeepIterator then calls searchSideward, which triggers the assertion.
(NB: DeepIterator is in the dw::core namespace.)
I think both DeepIterator::searchDownward() and DeepIterator::searchSideward() are not supposed to modify their argument it. So without really understanding what's going on, I would say it's a typo and should read: diff -r 8edae7f02bd7 dw/iterator.cc --- a/dw/iterator.cc Thu Dec 06 13:30:01 2007 +0100 +++ b/dw/iterator.cc Thu Dec 06 15:23:20 2007 +0100 @@ -343,7 +343,7 @@ Iterator *DeepIterator::searchDownward ( return NULL; } - while (fromEnd ? it->prev () : it->next ()) { + while (fromEnd ? it2->prev () : it2->next ()) { //DEBUG_MSG (1, "%*sexamining %s\n", // indent, "", a_Dw_iterator_text (it2)); @@ -384,7 +384,7 @@ Iterator *DeepIterator::searchSideward ( misc::assert (it->getContent()->type == Content::WIDGET, "no widget"); it2 = it->cloneIterator (); - while (fromEnd ? it->prev () : it->next ()) { + while (fromEnd ? it2->prev () : it2->next ()) { if (it2->getContent()->type == Content::WIDGET) { // Search downwards in this widget. it3 = searchDownward (it2, mask, fromEnd); Unfortunately it now crashes somewhere else related to text selection... Regards, Johannes
I'm trying to fix this but so far I'm just generating more crashes. What exactly should DeepIterator::DeepIterator do if searchDownward fails and changes the content of the iterator? If I know that I'll have another go.
Regards,
Jeremy Henty
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