// Ensure libunwind is compiled with exception handling code!
//
// To demonstrate the behaviour, compile with g++ -fnon-call-exceptions sigfpe.cpp -o sigfpe
// and then run ./sigfpe vs. LD_PRELOAD=/usr/lib/libunwind.so.7 ./sigfpe
//
// If you just want to see the ip and the before-flag, compile with '-D SHOW_IP
//

#include <signal.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

#ifdef SHOW_IP
extern "C" long _Unwind_GetIPInfo(void*, void*);

int counter = 0;

// Overwrite personality routine to demonstrate different behaviour
// of _Unwind_GetIPInfo for gcc and libunwind
extern "C" int
__gxx_personality_v0(int, int, uint64_t, void*, void* context)
{
    int before = 0;
    long ip = _Unwind_GetIPInfo(context, &before);
    printf("ip: 0x%lx, ip-before-ins: %d\n", ip, before);
    if (++counter == 2) {
        // Just exit after the second call
        // There should now be a difference between gcc and libunwind
        if (before == 0) {
            // Expected libunwind code path
            exit(1);
        }
        // Expected gcc code path
        exit(0);
    }
    return 8; // continue unwind...
}
#endif

struct Test
{
    ~Test()
    {
    }
};

int i;
void fpe()
{
    Test test;
    i = 1 / 0;
}

void sighandler(int signo)
{
    throw 0;
}

int main (int argc, char **argv)
{
    try {
        signal(SIGFPE, &sighandler);
        fpe();
    } catch (int) {
        printf("caught...\n");
    }
}