FloatingPointException.cc

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#ifdef _GNU_SOURCE
#  include <fenv.h>
#endif

#include "FloatingPointException.h"
#include <utl/Reader.h>
#include <fwk/CentralConfig.h>
#include <utl/ErrorLogger.h>
#include <utl/String.h>

#include <evt/Event.h>

using namespace std;
using namespace utl;
using namespace fwk;


namespace FloatingPointException {

  VModule::ResultFlag
  FloatingPointException::Init()
  {
#ifndef _GNU_SOURCE
    WARNING("floating-point exceptions will not be enabled on this architecture.");
#else
    Branch topB =
      CentralConfig::GetInstance()->GetTopBranch("FloatingPointException");
    const vector<unsigned int> bits = topB.GetChild("ExceptionBits").Get<vector<unsigned int>>();
    ostringstream info;
    info << "enabling floating point exception bits:";
    fExceptions = 0;
    for (const auto bit : bits) {
      fExceptions |= (1 << bit);
      info << ' ' << bit;
    }
    info << " (" << AsBinary(fExceptions, 8) << " = " << fExceptions << ')';
    INFO(info);
#endif
    fCounter = 0;

    return eSuccess;
  }


  VModule::ResultFlag
  FloatingPointException::Run(evt::Event& /*event*/)
  {
    ++fCounter;
#ifdef _GNU_SOURCE
    if (fCounter & 1) {
      feenableexcept(fExceptions);
      INFO("Enabling.");
    } else {
      fedisableexcept(fExceptions);
      INFO("Disabling.");
    }
#endif
    return eSuccess;
  }

}