test/core/test_indirectbr.c

/*
 * Copyright 2016 The Emscripten Authors.  All rights reserved.
 * Emscripten is available under two separate licenses, the MIT license and the
 * University of Illinois/NCSA Open Source License.  Both these licenses can be
 * found in the LICENSE file.
 */

#include <stdio.h>

int main() {
  const void *addrs[2] = {&&FOO, &&BAR};

  // confuse the optimizer so it doesn't hardcode the jump and avoid generating
  // an |indirectbr| instruction
  int which = 0;
  for (int x = 0; x < 1000; x++) {
    which = (which + x * x) % 7;
  }
  which = (which % 2) + 1;

  goto *addrs[which];

FOO:
  printf("bad\n");
  return 0;
BAR:
  printf("good\n");
  const void *addr = &&FOO;
  goto *addr;
}