/data/refman/pasoursint/CMSSW_5_3_0/src/FWCore/Services/src/InitRootHandlers.cc

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#include "FWCore/Services/src/InitRootHandlers.h"

#include "DataFormats/Common/interface/RefCoreStreamer.h"
#include "DataFormats/Streamer/interface/StreamedProductStreamer.h"
#include "FWCore/MessageLogger/interface/ELseverityLevel.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/PluginManager/interface/PluginCapabilities.h"
#include "FWCore/RootAutoLibraryLoader/interface/RootAutoLibraryLoader.h"
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include "FWCore/Utilities/interface/UnixSignalHandlers.h"

#include <sstream>
#include <string.h>

#include "Cintex/Cintex.h"
#include "G__ci.h"
#include "Reflex/Type.h"
#include "TROOT.h"
#include "TError.h"
#include "TFile.h"
#include "TH1.h"
#include "TSystem.h"
#include "TUnixSystem.h"
#include "TTree.h"

namespace {

  void RootErrorHandlerImpl(int level, char const* location, char const* message, bool ignoreWarnings) {

  bool die = false;

  // Translate ROOT severity level to MessageLogger severity level

    edm::ELseverityLevel el_severity = edm::ELseverityLevel::ELsev_info;

    if (level >= kFatal) {
      el_severity = edm::ELseverityLevel::ELsev_fatal;
    } else if (level >= kSysError) {
      el_severity = edm::ELseverityLevel::ELsev_severe;
    } else if (level >= kError) {
      el_severity = edm::ELseverityLevel::ELsev_error;
    } else if (level >= kWarning) {
      el_severity = ignoreWarnings ? edm::ELseverityLevel::ELsev_info : edm::ELseverityLevel::ELsev_warning;
    }

  // Adapt C-strings to std::strings
  // Arrange to report the error location as furnished by Root

    std::string el_location = "@SUB=?";
    if (location != 0) el_location = std::string("@SUB=")+std::string(location);

    std::string el_message  = "?";
    if (message != 0) el_message  = message;

  // Try to create a meaningful id string using knowledge of ROOT error messages
  //
  // id ==     "ROOT-ClassName" where ClassName is the affected class
  //      else "ROOT/ClassName" where ClassName is the error-declaring class
  //      else "ROOT"

    std::string el_identifier = "ROOT";

    std::string precursor("class ");
    size_t index1 = el_message.find(precursor);
    if (index1 != std::string::npos) {
      size_t index2 = index1 + precursor.length();
      size_t index3 = el_message.find_first_of(" :", index2);
      if (index3 != std::string::npos) {
        size_t substrlen = index3-index2;
        el_identifier += "-";
        el_identifier += el_message.substr(index2,substrlen);
      }
    } else {
      index1 = el_location.find("::");
      if (index1 != std::string::npos) {
        el_identifier += "/";
        el_identifier += el_location.substr(0, index1);
      }
    }

  // Intercept some messages and upgrade the severity

      if ((el_location.find("TBranchElement::Fill") != std::string::npos)
       && (el_message.find("fill branch") != std::string::npos)
       && (el_message.find("address") != std::string::npos)
       && (el_message.find("not set") != std::string::npos)) {
        el_severity = edm::ELseverityLevel::ELsev_fatal;
      }

      if ((el_message.find("Tree branches") != std::string::npos)
       && (el_message.find("different numbers of entries") != std::string::npos)) {
        el_severity = edm::ELseverityLevel::ELsev_fatal;
      }


  // Intercept some messages and downgrade the severity

      if ((el_message.find("no dictionary for class") != std::string::npos) ||
          (el_message.find("already in TClassTable") != std::string::npos) ||
          (el_message.find("matrix not positive definite") != std::string::npos) ||
          (el_message.find("not a TStreamerInfo object") != std::string::npos) ||
          (el_location.find("Fit") != std::string::npos) ||
          (el_location.find("TDecompChol::Solve") != std::string::npos) ||
          (el_location.find("THistPainter::PaintInit") != std::string::npos) ||
          (el_location.find("TUnixSystem::SetDisplay") != std::string::npos) ||
          (el_location.find("TGClient::GetFontByName") != std::string::npos)) {
        el_severity = edm::ELseverityLevel::ELsev_info;
      }

    if (el_severity == edm::ELseverityLevel::ELsev_info) {
      // Don't throw if the message is just informational.
      die = false;
    } else {
      die = true;
    }

  // Feed the message to the MessageLogger and let it choose to suppress or not.

  // Root has declared a fatal error.  Throw an EDMException unless the
  // message corresponds to a pending signal. In that case, do not throw
  // but let the OS deal with the signal in the usual way.
    if (die && (el_location != std::string("@SUB=TUnixSystem::DispatchSignals"))) {
       std::ostringstream sstr;
       sstr << "Fatal Root Error: " << el_location << "\n" << el_message << '\n';
       edm::Exception except(edm::errors::FatalRootError, sstr.str());
       throw except;
    }

    // Currently we get here only for informational messages,
    // but we leave the other code in just in case we change
    // the criteria for throwing.
    if (el_severity == edm::ELseverityLevel::ELsev_fatal) {
      edm::LogError("Root_Fatal") << el_location << el_message;
    } else if (el_severity == edm::ELseverityLevel::ELsev_severe) {
      edm::LogError("Root_Severe") << el_location << el_message;
    } else if (el_severity == edm::ELseverityLevel::ELsev_error) {
      edm::LogError("Root_Error") << el_location << el_message;
    } else if (el_severity == edm::ELseverityLevel::ELsev_warning) {
      edm::LogWarning("Root_Warning") << el_location << el_message ;
    } else if (el_severity == edm::ELseverityLevel::ELsev_info) {
      edm::LogInfo("Root_Information") << el_location << el_message ;
    }
  }

  void RootErrorHandler(int level, bool, char const* location, char const* message) {
    RootErrorHandlerImpl(level, location, message, false);
  }

  void RootErrorHandlerWithoutWarnings(int level, bool, char const* location, char const* message) {
    RootErrorHandlerImpl(level, location, message, true);
  }

  extern "C" {
    void sig_dostack_then_abort(int sig,siginfo_t*,void*) {
      if (gSystem) {
        const char* signalname = "unknown";
        switch (sig) {
          case SIGBUS:
            signalname = "bus error";
            break;
          case SIGSEGV:
            signalname = "segmentation violation";
            break;
          case SIGILL:
            signalname = "illegal instruction"; 
          default:
            break;
        }
        edm::LogError("FatalSystemSignal")<<"A fatal system signal has occurred: "<<signalname;
        std::cerr<< "\n\nA fatal system signal has occurred: "<<signalname<<"\n"
                 <<"The following is the call stack containing the origin of the signal.\n"
                 <<"NOTE:The first few functions on the stack are artifacts of processing the signal and can be ignored\n\n";
        
        gSystem->StackTrace();
        std::cerr<<"\nA fatal system signal has occurred: "<<signalname<<"\n";
      }
      ::abort();
    }
  }
}  // end of unnamed namespace

namespace edm {
  namespace service {
    InitRootHandlers::InitRootHandlers (ParameterSet const& pset)
      : RootHandlers(),
        unloadSigHandler_(pset.getUntrackedParameter<bool> ("UnloadRootSigHandler")),
        resetErrHandler_(pset.getUntrackedParameter<bool> ("ResetRootErrHandler")),
        autoLibraryLoader_(pset.getUntrackedParameter<bool> ("AutoLibraryLoader")) {

      if(unloadSigHandler_) {
      // Deactivate all the Root signal handlers and restore the system defaults
        gSystem->ResetSignal(kSigChild);
        gSystem->ResetSignal(kSigBus);
        gSystem->ResetSignal(kSigSegmentationViolation);
        gSystem->ResetSignal(kSigIllegalInstruction);
        gSystem->ResetSignal(kSigSystem);
        gSystem->ResetSignal(kSigPipe);
        gSystem->ResetSignal(kSigAlarm);
        gSystem->ResetSignal(kSigUrgent);
        gSystem->ResetSignal(kSigFloatingException);
        gSystem->ResetSignal(kSigWindowChanged);
      } else if(pset.getUntrackedParameter<bool>("AbortOnSignal")){
        //NOTE: ROOT can also be told to abort on these kinds of problems BUT
        // it requires an TApplication to be instantiated which causes problems
        gSystem->ResetSignal(kSigBus);
        gSystem->ResetSignal(kSigSegmentationViolation);
        gSystem->ResetSignal(kSigIllegalInstruction);
        installCustomHandler(SIGBUS,sig_dostack_then_abort);
        installCustomHandler(SIGSEGV,sig_dostack_then_abort);
        installCustomHandler(SIGILL,sig_dostack_then_abort);
      }

      if(resetErrHandler_) {

      // Replace the Root error handler with one that uses the MessageLogger
        SetErrorHandler(RootErrorHandler);
      }

      // Enable automatic Root library loading.
      if(autoLibraryLoader_) {
        RootAutoLibraryLoader::enable();
      }

      // Enable Cintex.
      ROOT::Cintex::Cintex::Enable();

      // Set ROOT parameters.
      TTree::SetMaxTreeSize(kMaxLong64);
      TH1::AddDirectory(kFALSE);
      G__SetCatchException(0);

      // Set custom streamers
      setRefCoreStreamer();
      setStreamedProductStreamer();

      // Load the library containing dictionaries for std:: classes (e.g. std::vector<int>)
      if (ROOT::Reflex::Type()== Reflex::Type::ByName("std::vector<std::vector<unsigned int> >")) {
         edmplugin::PluginCapabilities::get()->load("LCGReflex/std::vector<std::vector<unsigned int> >");
      }
    }

    InitRootHandlers::~InitRootHandlers () {
      // close all open ROOT files
      // We get a new iterator each time,
      // because closing a file can invalidate the iterator
      while(gROOT->GetListOfFiles()->GetSize()) {
        TIter iter(gROOT->GetListOfFiles());
        TFile* f = dynamic_cast<TFile*>(iter.Next());
        if(f) f->Close();
      }
    }

    void InitRootHandlers::fillDescriptions(ConfigurationDescriptions& descriptions) {
      ParameterSetDescription desc;
      desc.setComment("Centralized interface to ROOT.");
      desc.addUntracked<bool>("UnloadRootSigHandler", false)
          ->setComment("If True, signals are handled by this service, rather than by ROOT.");
      desc.addUntracked<bool>("ResetRootErrHandler", true)
          ->setComment("If True, ROOT messages (e.g. errors, warnings) are handled by this service, rather than by ROOT.");
      desc.addUntracked<bool>("AutoLibraryLoader", true)
          ->setComment("If True, enables automatic loading of data dictionaries.");
      desc.addUntracked<bool>("AbortOnSignal",true)
      ->setComment("If True, do an abort when a signal occurs that causes a crash. If False, ROOT will do an exit which attempts to do a clean shutdown.");
      descriptions.add("InitRootHandlers", desc);
    }

    void
    InitRootHandlers::disableErrorHandler_() {
        SetErrorHandler(DefaultErrorHandler);
    }

    void
    InitRootHandlers::enableErrorHandler_() {
        SetErrorHandler(RootErrorHandler);
    }

    void
    InitRootHandlers::enableErrorHandlerWithoutWarnings_() {
        SetErrorHandler(RootErrorHandlerWithoutWarnings);
    }

  }  // end of namespace service
}  // end of namespace edm