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This queue is for tickets about the XML-LibXML CPAN distribution.

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The Basics
Id: 13088
Status: resolved
Priority: 0/
Queue: XML-LibXML

People
Owner: Nobody in particular
Requestors: martin [...] hybyte.com
Cc:
AdminCc:

Bug Information
Severity: Normal
Broken in: 1.58
Fixed in: (no value)



Subject: Leak / Circular Reference
I found a circular Refernce between XML::LibXML and XML::LibXML::SAX It can be caused by the following script: use XML::SAX; $XML::SAX::ParserPackage = "XML::LibXML::SAX"; use XML::Simple; for (1..3) { my $c = XML::Simple->new->XMLin("<xml>z</xml>"); }; *UNIVERSAL::DESTROY = sub {warn $_[0]}; You will see the amount of DESTROY " during global destruction " grows with the amount of loops. running XML::Simple with $XML::SAX::ParserPackage = "XML::SAX::PurePerl"; does not cause the problem. I was able to get a Dump of the remining Object: $VAR1 = bless( { 'XML_LIBXML_KEEP_BLANKS' => 1, '_State_' => 0, 'SAX_ELSTACK' => [], 'SAX' => { 'State' => 0 }, 'HANDLER' => bless( { 'XML::SAX::Base::Features' => { 'http://xml.org/sax/features/namespaces' => 1 }, 'Handler' => bless( { 'nocollapse' => 1, 'def_opt' => {}, 'opt' => { 'normalisespace' => 0, 'rootname' => 'opt', 'parseropts' => [], 'keyattr' => [ 'name', 'key', 'id' ], 'forcearray' => 0, 'contentkey' => 'content', 'searchpath' => [] } }, 'XML::Simple' ), 'Methods' => { 'end_element' => sub { "DUMMY" }, 'xml_decl' => sub { "DUMMY" }, 'start_document' => sub { "DUMMY" }, 'end_document' => sub { "DUMMY" }, 'characters' => sub { "DUMMY" }, 'start_element' => sub { "DUMMY" } }, 'ParserOptions' => bless( { 'ParseFunc' => sub { "DUMMY" }, 'LibParser' => $VAR1, 'ParseFuncParam' => '<xml>z</xml>' }, 'XML::LibXML::SAX' ), 'ParseOptions' => undef }, 'XML::LibXML::SAX' ) }, 'XML::LibXML' ); You can see that ParserOptions->{LibParser} points back to $VAR1 This happens in package XML::LibXML::SAX; $VERSION = '1.00'; sub _parse { my $self = shift; my $args = bless $self->{ParserOptions}, ref($self); $args->{LibParser}->set_handler( $self ); $args->{ParseFunc}->($args->{LibParser}, $args->{ParseFuncParam}); if ( $args->{LibParser}->{SAX}->{State} == 1 ) { croak( "SAX Exception not implemented, yet; Data ended before document ended\n" ); } return $self->end_document({}); } In the 4th line, the call: ->set_handler($self) creates this reference. I have notdebugged that any further, but either here, or on the other end of the circular ref, should probably be a weak reference, so that a proper cleanup is guaranteed, in any context. I am experience this on several FreeBSD configurations, with varios versions of perl: perl -v This is perl, v5.8.6 built for i386-freebsd-64int perl -v This is perl, v5.8.0 built for i386-freebsd I have the following Versions of CPAN mudules: XML::LibXML => 1.58 XML::LibXML::Common => 0.13 XML::LibXML::SAX => 1.00 XML::SAX => 0.12 XML::SAX::Base => 1.04 XML::SAX::Exception => 1.01 XML::SAX::ParserFactory => 1.01 XML::Simple => 2.13 # happens with 2.14 too Please apologise, that I have not tracked down the problem, without the use of XML::Simple. but all the above point to a problem insid XML::LibXML
fixed in the CVS.


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