// verifast_options{disable_overflow_check target:ILP32} extern void abort(void);//@ requires true; //@ ensures true; extern void __assert_fail(const char *, const char *, unsigned int, const char *) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__)); void reach_error() //@ requires false; //@ ensures true; { __assert_fail("0", "ps2-ll.c", 3, "reach_error"); } extern int __VERIFIER_nondet_int(void);//@ requires true; //@ ensures true; extern void abort(void); void assume_abort_if_not(int cond) //@ requires true; //@ ensures true; { if(!cond) {abort();} } void __VERIFIER_assert(int cond) //@ requires (1 <= cond); //@ ensures (1 <= cond); { if (!(cond)) { ERROR: {reach_error();} } return; } int main() //@ requires module(ps2_ll__verifast_instrumented_modified, true); //@ ensures junk(); { int k; long long y, x, c; k = __VERIFIER_nondet_int(); y = 0; x = 0; c = 0; while (1)//@ invariant ((x * 2) == (y + (y * y))); { __VERIFIER_assert((y * y) - 2 * x + y == 0); if (!(c < k)) break; c = c + 1; y = y + 1; x = y + x; } __VERIFIER_assert((y*y) - 2*x + y == 0); return 0; }