Memory leak in error cases
--------------------------
Key: XERCESC-1486
URL: http://issues.apache.org/jira/browse/XERCESC-1486
Project: Xerces-C++
Type: Bug
Components: SAX/SAX2
Versions: 2.6.0
Environment: HP-UX B.11.11 U 9000/800
aCC: HP ANSI C++ B3910B A.03.57
Reporter: Stephan Irrgang
Hi,
I found a memory leak using the SAX Parser in error cases like file not found
or unexcepted end of file. I first detected it with Xerces C++ release 2.3, and
then verified that it's still in contained in the latest release (2.6). Here's
the source code I used to test this issue; in this example the XML file to
parse is not existing.
#include <xercesc/sax/HandlerBase.hpp>
#include <xercesc/sax/AttributeList.hpp>
#include <xercesc/parsers/SAXParser.hpp>
#include <iostream.h>
using namespace XERCES_CPP_NAMESPACE;
class myCallbackHandler_c : public HandlerBase
{
public:
void fatalError (const SAXParseException& exception)
{
char chBuffer[256];
XMLString::transcode(exception.getMessage(), chBuffer, 255);
throw chBuffer;
}
};
int main()
{
int returnValue = 0;
XMLPlatformUtils::Initialize();
SAXParser *saxParserPtr = new SAXParser;
myCallbackHandler_c *callbackHandlerPtr = new myCallbackHandler_c;
saxParserPtr->setErrorHandler(callbackHandlerPtr);
try
{
saxParserPtr->parse("FileNotFound.xml");
}
catch (const char* s)
{
cerr << s << endl;
returnValue = 1;
}
catch (...)
{
cerr << "Unknown exception!" << endl;
returnValue = 1;
}
delete callbackHandlerPtr;
delete saxParserPtr;
XMLPlatformUtils::Terminate();
cout << "Returning: " << returnValue << endl;
return returnValue;
}
When running it with Rational Purify it shows following memory leaks (BTW, the
same leaks are shown when using HP WDB's memory check functionality).
MLK: 186 bytes leaked at 0x400bbd08
This memory was allocated from:
malloc [rtlib.o]
__nW__fUl [libCsup.2]
operator new(unsigned long) [rtlib.o]
xercesc_2_6::MemoryManagerImpl::allocate(unsigned long)
[libxerces-c.sl.26.0]
xercesc_2_6::XMLException::XMLException(const
xercesc_2_6::XMLException &)%2 [libxerces-c.sl.26.0]
xercesc_2_6::IGXMLScanner::scanReset(const
xercesc_2_6::InputSource &) [libxerces-c.sl.26.0]
xercesc_2_6::IGXMLScanner::scanDocument(const
xercesc_2_6::InputSource &) [libxerces-c.sl.26.0]
xercesc_2_6::XMLScanner::scanDocument(const unsigned short *)
[libxerces-c.sl.26.0]
xercesc_2_6::XMLScanner::scanDocument(const char *)
[libxerces-c.sl.26.0]
xercesc_2_6::SAXParser::parse(const char *) [libxerces-c.sl.26.0]
main [xerces_mlk.cc:29]
_start [libc.2]
$START$ [crt0.o]
$START$ [crt0.o]
MLK: 18 bytes leaked at 0x400a7b18
This memory was allocated from:
malloc [rtlib.o]
__nW__fUl [libCsup.2]
operator new(unsigned long) [rtlib.o]
xercesc_2_6::MemoryManagerImpl::allocate(unsigned long)
[libxerces-c.sl.26.0]
static xercesc_2_6::XMLString::replicate(const char
*,xercesc_2_6::MemoryManager *) [libxerces-c.sl.26.0]
xercesc_2_6::XMLException::XMLException(const
xercesc_2_6::XMLException &)%2 [libxerces-c.sl.26.0]
xercesc_2_6::IGXMLScanner::scanReset(const
xercesc_2_6::InputSource &) [libxerces-c.sl.26.0]
xercesc_2_6::IGXMLScanner::scanDocument(const
xercesc_2_6::InputSource &) [libxerces-c.sl.26.0]
xercesc_2_6::XMLScanner::scanDocument(const unsigned short *)
[libxerces-c.sl.26.0]
xercesc_2_6::XMLScanner::scanDocument(const char *)
[libxerces-c.sl.26.0]
xercesc_2_6::SAXParser::parse(const char *) [libxerces-c.sl.26.0]
main [xerces_mlk.cc:29]
_start [libc.2]
$START$ [crt0.o]
$START$ [crt0.o]
To me it seems the XMLException object is not released in case an exception is
thrown in an error handler's fatalError method. Any ideas? Thanks in advance!
Regards,
Stephan
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