source: doc/theses/andrew_beach_MMath/code/throw-empty.cfa@ 5d8dae7

// Throw Across Empty Function
#include <clock.hfa>
#include <exception.hfa>
#include <fstream.hfa>
#include <stdlib.hfa>                                                                   // strto

exception empty_exception;
vtable(empty_exception) empty_vt;

void unwind_empty(unsigned int frames) {
        if (frames) {
                unwind_empty(frames - 1);
                if ( frames == -1 ) printf( "42" );                             // prevent recursion optimizations
        } else {
                throw (empty_exception){&empty_vt};
        }
}

int main(int argc, char * argv[]) {
        unsigned int times = 1;
        unsigned int total_frames = 1;
        if (1 < argc) {
                times = strto(argv[1], 0p, 10);
        }
        if (2 < argc) {
                total_frames = strto(argv[2], 0p, 10);
        }

        Time start_time = timeHiRes();
        for (unsigned int count = 0 ; count < times ; ++count) {
                try {
                        unwind_empty(total_frames);
                } catch (empty_exception *) {
                        asm volatile ("# catch block");
                }
        }
        Time end_time = timeHiRes();
        sout | "Run-Time (s): " | wd(0,1, (end_time - start_time)`ns / 1_000_000_000.);
}