[jira] Created: (XERCESC-1589) XML DOM parser does not release memory on parser:release and resetDocumentPool()

[Rinil Baxi (JIRA)]

XML DOM parser does not release memory on parser:release and resetDocumentPool()
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         Key: XERCESC-1589
         URL: http://issues.apache.org/jira/browse/XERCESC-1589
     Project: Xerces-C++
        Type: Bug

  Components: DOM  
    Versions: 2.4.0    
 Environment: HP-Tandem-NonStop Kernel

    Reporter: Rinil Baxi


1) Use the following code:

/home/Rinil/Xml/dom [2441]: more mleak.cpp
#include < string.h>
#include < cextdecs.h>
#include < iostream>
#include < xercesc/util/PlatformUtils.hpp>
#include < xercesc/parsers/AbstractDOMParser.hpp>
#include < xercesc/dom/DOMImplementation.hpp>
#include < xercesc/dom/DOMImplementationLS.hpp>
#include < xercesc/dom/DOMImplementationRegistry.hpp>
#include < xercesc/dom/DOMBuilder.hpp>
#include < xercesc/dom/DOMException.hpp>
#include < xercesc/dom/DOMDocument.hpp>
#include < xercesc/dom/DOMNodeList.hpp>
#include < xercesc/dom/DOMError.hpp>
#include < xercesc/dom/DOMLocator.hpp>
#include < xercesc/dom/DOMWriter.hpp>
#include < xercesc/framework/StdOutFormatTarget.hpp>
#include < xercesc/framework/LocalFileFormatTarget.hpp>
#include < xercesc/framework/MemBufInputSource.hpp>
#include < xercesc/framework/Wrapper4InputSource.hpp>
#include < xercesc/parsers/XercesDOMParser.hpp>
#include < xercesc/util/XMLUni.hpp>
#include < xercesc/util/XMLException.hpp>


unsigned long getMemUsage ()
{
 short gError = 0;
 short myHandle[10];
 short attrList[10];
 short valList[10];
 short valMaxLen = 10;
 short valLen = 0;
 short attrs = 0;

 unsigned long *memUsage;

 gError = PROCESSHANDLE_GETMINE_ (&myHandle[0]);

 if (gError)
  return 0;35%)

 memset (&attrList[0], '\0', 10);

 memset (&valList[0], '\0', 10);

 attrList[attrs] = 111;
 attrs++;

 gError = PROCESS_GETINFOLIST_
  (,,,,&myHandle[0]
  ,&attrList[0]
  ,attrs
  ,&valList[0]
  ,valMaxLen
  ,&valLen
  );

 if (gError)
  return 0;

 memUsage = (unsigned long *) (&valList[0]);

 return *memUsage;

}

int main()
{
 DOMImplementation *impl;
 DOMBuilder *parser;
 DOMDocument *doc;

 const XMLCh gLS[] = { chLatin_L, chLatin_S, chNull };

 std::cout < < "\nMEMUSAGE at Start : "< < getMemUsage();

 // Initialize the XML system
 try {
        XMLPlatformUtils::Initialize();
        XMLPlatformUtils::recognizeNEL(false);
  }

 catch (const XMLException& toCatch) {
          return 1;
 }

 impl = DOMImplementationRegistry::getDOMImplementation(gLS);

 parser = 
((DOMImplementationLS*)impl)->createDOMBuilder(DOMImplementationLS::MODE_SYNCHRONOUS,
 0);

 if (parser == NULL) {
  //Its known that XML system must be terminated before returning
  return 1;
 }

 parser->setFeature(XMLUni::fgDOMNamespaces,true);
 parser->setFeature(XMLUni::fgXercesSchema, false);
 parser->setFeature(XMLUni::fgXercesSchemaFullChecking, false);
 parser->setFeature(XMLUni::fgDOMValidateIfSchema, false);
 parser->setFeature(XMLUni::fgDOMDatatypeNormalization, true);

 //Reset Document Pool
 parser->resetDocumentPool();

 std::cout< < "\nMEMUSAGE before parsing: "< < getMemUsage();

 //Parse XML and get document
 try{
  doc = parser->parseURI("personal.xml");
 }
 catch(DOMException dome){
  //Its known that XML system must be terminated before returning
  return 1;
 }

 std::cout< < "\nMEMUSAGE after parsing: "< < getMemUsage();
 //Reset Document Pool
 parser->resetDocumentPool();
 std::cout< < "\nMEMUSAGE after resetDocumentpool(): "< < getMemUsage();

 //Release Parser
 //This should also release DOMDOcument associated i.e. doc
 parser->release();

 std::cout< < "\nMEMUSAGE after parser release(): "< < getMemUsage();

 XMLPlatformUtils::Terminate();

 std::cout< < "\nMEMUSAGE after Terminate(): "< < getMemUsage()< < std::endl;

 return 0;

}

/home/Rinil/xml/dom [2442]:

2) Compile using Makefiles provided with XML samples.

3) Place a xml file to be parsed in the CWD. ie personal.xml which comes with
the samples.

4) run mleak:

/home/RinilXml/dom [2452]: ./mleak

MEMUSAGE at Start : 16384
MEMUSAGE before parsing: 57344
MEMUSAGE after parsing: 245888
MEMUSAGE after resetDocumentpool(): 245888
MEMUSAGE after parser release(): 245888
MEMUSAGE after Terminate(): 245888


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