PetscException.cpp

/*

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 * Redistributions of source code must retain the above copyright notice,
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 * Redistributions in binary form must reproduce the above copyright notice,
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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*/

#include <sstream>

#include "PetscException.hpp"
#include "Exception.hpp"
#include "Warnings.hpp"


/*
 * Positive codes mean that there's an error.
 * Zero means success.
 * Negative codes should never happen, but we'll throw anyway.
 */
void PetscException(PetscInt petscError,
                    unsigned line,
                    const char* funct,
                    const char* file)
{
    if (petscError != 0)
    {
        const char*  p_text;
        char default_message[30]="Unknown PETSc error code";

        /*
         * PetscErrorMessage will swing p_text to point to the error code's message
         * ...but only if it's a valid code.
         */
        PetscErrorMessage(petscError, &p_text, NULL);
        if (p_text == 0)
        {
            p_text=default_message;
        }
        EXCEPTION(p_text << " in function '" << funct  << "' on line "
                  << line << " of file " << file);
    }
}

/*
 * Positive codes mean that the KSP converged.
 * Negative codes mean that the KSP diverged, i.e. there's a problem.
 */
std::string GetKspErrorMessage(PetscInt kspError)
{
    std::string err_string;

#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
    switch (kspError)
    {
        case KSP_DIVERGED_ITS:
            err_string = "KSP_DIVERGED_ITS";
            break;
        case KSP_DIVERGED_DTOL:
            err_string = "KSP_DIVERGED_DTOL";
            break;
        case KSP_DIVERGED_BREAKDOWN:
            err_string = "KSP_DIVERGED_BREAKDOWN";
            break;
        case KSP_DIVERGED_BREAKDOWN_BICG:
            err_string = "KSP_DIVERGED_BREAKDOWN_BICG";
            break;
        case KSP_DIVERGED_NONSYMMETRIC:
            err_string = "KSP_DIVERGED_NONSYMMETRIC";
            break;
        case KSP_DIVERGED_INDEFINITE_PC:
            err_string = "KSP_DIVERGED_INDEFINITE_PC";
            break;
        default:
            err_string = "Unknown KSP error code";
    }
#else
    // This array contains the strings describing KSP convergence/divergence reasons.
    // It is exported by libpetscksp.a
#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 2) //PETSc 3.2 or later
    //External declaration of KSPConvergedReasons already happens
    extern const char * const *KSPConvergedReasons;
#else
    extern const char **KSPConvergedReasons;
#endif

    // The code for the last known error (-10) is hardcoded in PETSc, in future releases it might change.
    // It is defined in src/ksp/ksp/interface/dlregisksp.c
    if (kspError >= -10)
    {
        err_string = KSPConvergedReasons[kspError];
    }
    else
    {
        err_string = "Unknown KSP error code";
    }
#endif

    return err_string;
}

/*
 * Positive codes mean that the KSP converged.
 * Negative codes mean that the KSP diverged, i.e. there's a problem.
 */
void KspException(PetscInt kspError,
                  unsigned line,
                  const char* funct,
                  const char* file)
{
    if (kspError < 0)
    {
        std::string err_string = GetKspErrorMessage(kspError);

        err_string += " in function '";
        err_string += funct;
        err_string += "' on line ";
        err_string += line;
        err_string += " of file ";
        err_string += file;

        EXCEPTION(err_string);
    }
}

void KspWarnIfFailed(PetscInt kspError)
{
    if (kspError < 0)
    {
        std::string message = "Linear solve failed: " + GetKspErrorMessage(kspError);
        WARNING(message);
    }
}