#include <stdio.h>

#define UNW_LOCAL_ONLY
#include <libunwind.h>


#define NOINLINE	__attribute__((noinline))

void show_backtrace (void) {
    void* pc0 = __builtin_return_address(0);

    printf( "Backtracing %08x\n", pc0 );

    unw_cursor_t cursor;
    unw_context_t uc;
    unw_word_t ip, sp;

    unw_getcontext(&uc);
    unw_init_local(&cursor, &uc);
    while (unw_step(&cursor) > 0)
    {
        unw_get_reg(&cursor, UNW_REG_IP, &ip);
        unw_get_reg(&cursor, UNW_REG_SP, &sp);
        printf ("ip = %lx, sp = %lx\n", (long) ip, (long) sp);
    }


}

void f( int i );


void NOINLINE another( int i )
{
    printf( "calling f\n");
    f( i );


}

void NOINLINE f( int i )
{
    printf( "eek %d\n", i );
    if( i > 0 )
        f( i -1 );
    else
        show_backtrace();

}

int main( int argc, char** argv )
{
  printf( "hello world\n" );
  f( 10 );
  another( 5 );
  pause();
  return 0;
}