[Xapian-tickets] [Xapian] #520: TermIterator::get_term() can fault (core dump with php bindings on windows)

Xapian nobody at xapian.org
Mon Dec 13 12:15:21 GMT 2010

#520: TermIterator::get_term() can fault (core dump with php bindings on windows)
 Reporter:  Daniel.Menard          |       Owner:       
     Type:  defect                 |      Status:  new  
 Priority:  normal                 |   Milestone:  1.2.x
Component:  Xapian-bindings (PHP)  |     Version:  1.2.3
 Severity:  minor                  |    Keywords:       
Blockedby:                         |    Platform:  All  
 Blocking:                         |  
Changes (by olly):

  * platform:  Microsoft Windows => All
  * milestone:  => 1.2.x


 This behaviour is sort of expected.  The semantics of C++ iterators are
 that trying to dereference or advance them past the end position is
 undefined behaviour, and PHP inherits this since it just puts a thin PHP
 class wrapper around the C++ iterator classes.

 The best fix for this would be to wrap the C++ iterator classes as PHP5
 iterators, which would do away with the ugly equals() method and allow
 looping over an iterator to be written as something like:

 foreach ($db->allterms() as $it) {
     echo $it->get_term(), ": ", $it->get_term_freq(), "\n";

 At the time we sorted out the PHP5 wrappers, there were several approaches
 from different people which emerged at about the same time.  Paul Dixon's
 included PHP5 iterator wrappers, and is described here:


 But the iterator wrappers part didn't get merged in back then.

 I've just spent a while looking at adding these in, but annoyingly it's
 not trivial to fit this in with how the SWIG generated wrappers work.

 So I think for 1.2.4 I'll just document this issue, and this ticket can be
 for implementing PHP5 iterators (trunk r15223, 1.0 branch r15224).

 Marking as 1.2.x - we should be able to do this such that the existing
 iterator wrappers continue to work, but we can mark these as deprecated
 and remove them at some point.

Ticket URL: <http://trac.xapian.org/ticket/520#comment:1>
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