source: doc/theses/andrew_beach_MMath/code/fixup-other-r.cfa @ c8238c0

// Resume Across Other Handler
#include <clock.hfa>
#include <exception.hfa>
#include <fstream.hfa>
#include <stdlib.hfa>

exception fixup_exception {
        int & fixup;
};
vtable(fixup_exception) fixup_vt;
exception not_raised_exception {
        int & fixup;
};

// Using a global value to allow hoisting (and avoid thunks).
unsigned int frames;

void nounwind_other(unsigned int dummy) {
        if (frames) {
                frames -= 1;
                try {
                        nounwind_other(42);
                        // Always false, but prevents recursion elimination.
                        if (-1 == frames) printf("~");
                } catchResume (not_raised_exception * ex) {
                        ex->fixup = frames + 42;
                }
        } else {
                int fixup = dummy;
                throwResume (fixup_exception){&fixup_vt, fixup};
        }
}

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);
        }
        frames = total_frames;

        Time start_time = timeHiRes();
        for (int count = 0 ; count < times ; ++count) {
                try {
                        nounwind_other(42);
                } catchResume (fixup_exception * ex) {
                        ex->fixup = total_frames + 42;
                }
        }
        Time end_time = timeHiRes();
        sout | "Run-Time (s): " | wd(0,1, (end_time - start_time)`ns / 1_000_000_000.);
}