Boost C++ Libraries

libs/test/example/exec_mon_example.cpp

//  (C) Copyright Gennadiy Rozental 2003-2014.
//  Distributed under the Boost Software License, Version 1.0.
//  (See accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)

//  See http://www.boost.org/libs/test for the library home page.

#include <boost/test/prg_exec_monitor.hpp>
#include <boost/test/execution_monitor.hpp>
#include <boost/test/utils/basic_cstring/io.hpp>

#include <iostream>

struct my_exception1
{
    explicit    my_exception1( int res_code ) : m_res_code( res_code ) {}

    int         m_res_code;
};

struct my_exception2
{
    explicit    my_exception2( int res_code ) : m_res_code( res_code ) {}

    int         m_res_code;
};

namespace {

class dangerous_call {
public:
    dangerous_call( int argc ) : m_argc( argc ) {}

    int operator()()
    {
        // here we perform some operation under monitoring that could throw my_exception
        if( m_argc < 2 )
            throw my_exception1( 23 );
        if( m_argc > 3 )
            throw my_exception2( 45 );
        else if( m_argc > 2 )
            throw "too many args";

        return 1;
    }

private:
    // Data members
    int     m_argc;
};

void translate_my_exception1( my_exception1 const& ex )
{
    std::cout << "Caught my_exception1(" << ex.m_res_code << ")"<< std::endl;
}

void translate_my_exception2( my_exception2 const& ex )
{
    std::cout << "Caught my_exception2(" << ex.m_res_code << ")"<< std::endl;
}

int generate_fpe()
{
    double d = 0.0;

    d = 1/d;

    return 0;
}

int generate_fpe2()
{
    double d = 1e158;

    d = d*d;

    return 0;
}

int generate_fpe3()
{
    double d = 1.1e-308;

    d = 1/d;

    return 0;
}

int generate_int_div_0()
{
    int i = 0;

    return 1/i;
}

#if (defined(__clang__) && __clang_major__ >= 6) || (defined(__GNUC__) && __GNUC__ >= 8)
__attribute__((no_sanitize("null")))
#endif
int generate_sigfault()
{
    int* p = 0;

    return *p;
}


} // local_namespace

int
cpp_main( int argc , char *[] )
{
    ::boost::execution_monitor ex_mon;

    ///////////////////////////////////////////////////////////////

    ex_mon.register_exception_translator<my_exception1>( &translate_my_exception1, "except1" );
    ex_mon.register_exception_translator<my_exception2>( &translate_my_exception2, "except2" );

    try {
        ex_mon.execute( dangerous_call( argc ) );
        std::cout << "Should reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }

    ///////////////////////////////////////////////////////////////

    ex_mon.erase_exception_translator( "except2" );

    try {
        ex_mon.execute( dangerous_call( 5 ) );
        std::cout << "Should not reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }

    ///////////////////////////////////////////////////////////////

    ex_mon.erase_exception_translator<my_exception1>();

    try {
        ex_mon.execute( dangerous_call( 1 ) );
        std::cout << "Should not reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }

    ///////////////////////////////////////////////////////////////

// we are currently not able to silence those errors below with UBSAN under clang
// this seems to come from the way clang handles floating point exceptions + UB.
#if !(defined(HAS_UBSAN) && (HAS_UBSAN==1) && defined(__clang__))

    ex_mon.p_detect_fp_exceptions.value = boost::fpe::BOOST_FPE_DIVBYZERO;
    ex_mon.p_catch_system_errors.value = false;

    try {
        ex_mon.execute( &generate_fpe );
        std::cout << "Should not reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }

    ///////////////////////////////////////////////////////////////

    ex_mon.p_detect_fp_exceptions.value = boost::fpe::BOOST_FPE_ALL;

    try {
        ex_mon.execute( &generate_fpe2 );
        std::cout << "Should not reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }

    try {
        ex_mon.execute( &generate_fpe3 );
        std::cout << "Should not reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }

    ///////////////////////////////////////////////////////////////

    ex_mon.p_detect_fp_exceptions.value = boost::fpe::BOOST_FPE_OFF;
    ex_mon.p_catch_system_errors.value = true;

    try {
        ex_mon.execute( &generate_int_div_0 );
        std::cout << "Should not reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }

    ///////////////////////////////////////////////////////////////

    ex_mon.p_detect_fp_exceptions.value = boost::fpe::BOOST_FPE_OFF;
    ex_mon.p_catch_system_errors.value = true;

    try {
        ex_mon.execute( &generate_sigfault );
        std::cout << "Should not reach this line " << __LINE__ << std::endl;
    }
    catch ( boost::execution_exception const& ex ) {
        std::cout << "Caught exception: " << ex.what() << std::endl;
    }
#endif // UBSAN issue

    return 0;
}

// EOF