Using Report Modified

[Kiran Kumar]

Folks,

I have the below code to test ReportModified API functionality. I am having issue in using this and facing a SIGSEGV crash.

My code is as below.

bool compare_gpb()

{

    ConfigMsg *cfgMsg1 = new ConfigMsg();

    CfgServerMsg serverMsg1;

    cfgMsg1->set_msgid(100);

    cfgMsg1->set_cfgname("obj1");

    for (int j = 1; j < 3; j++) {

        /* Fill some repeated fields */

    }

    serverMsg1.set_allocated_cfgmsg(cfgMsg1);

    ConfigMsg *cfgMsg2 = new ConfigMsg();

    CfgServerMsg serverMsg2;

    cfgMsg2->set_msgid(100);

    cfgMsg2->set_cfgname("obj1");

    for (int j = 1; j < 3; j++) {

   

         /* Fill some repeated fields */

    }

    serverMsg2.set_allocated_cfgmsg(cfgMsg2);

    MessageDifferencer msgDiff;

    msgDiff.set_report_matches(true);

    msgDiff.set_report_moves(true); 

   

    msgDiff.set_scope(MessageDifferencer::FULL);

    std::string diffReport;

    std::string output;

    StringOutputStream output_stream(&output);

    MessageDifferencer::StreamReporter reporter(&output_stream);

    reporter.set_report_modified_aggregates(false);

    msgDiff.ReportDifferencesToString(&diffReport);

    msgDiff.ReportDifferencesTo(&reporter);

    std::cout << "Result is:" << msgDiff.Compare(serverMsg1, serverMsg2) << std::endl;

    std::cout << "The Differences are:" << output << std::endl;

    std::vector<MessageDifferencer::SpecificField> path;

    const CfgServerMsg &message1(serverMsg1);

    const CfgServerMsg &message2(serverMsg2);

    reporter.ReportModified(message1, message2, path);

    std::cout << "The ReportModified size " << path.size() << std::endl;

}

I see that ReportModified crashes with the below call stack.

(gdb) bt

#0  google::protobuf::util::MessageDifferencer::StreamReporter::PrintValue (

    this=0x7ffdea175c20, message=warning: RTTI symbol not found for class 'cfg::CfgServerMsg'

..., field_path=std::vector of length 0, capacity 0, 

    left_side=true) at google/protobuf/util/message_differencer.cc:1787

#1  0x00000000004fd0df in google::protobuf::util::MessageDifferencer::StreamReporter::ReportModified (this=0x7ffdea175c20, message1=warning: RTTI symbol not found for class 'cfg::CfgServerMsg'

..., message2=warning: RTTI symbol not found for class 'cfg::CfgServerMsg'

..., 

    field_path=std::vector of length 0, capacity 0)

    at google/protobuf/util/message_differencer.cc:1900

#2  0x00000000004b13b4 in compare_gpb() ()

#3  0x00000000004b171f in main ()

(gdb)

Any clue on how to move forward on this ?