cppcheck/test/synthetic/ub.c

void alias() {
    int x; int *ip=&x; float *fp = (float *)ip;
}
int buffer_overflow() {
    int x[10]={0}; return x[100];
}
int dead_pointer(int a) {
    int *p=&a; if (a) { int x=0; p = &x; } return *p;
}
int division_by_zero() {
    return 100 / 0;
}
int float_to_int() {
    double d=1E100; return (int)d;
}
void negative_size(int sz) {
    if (sz < 0) { int buf[sz]; }
}
int no_return() {}
int null_pointer() {
    int *p = 0; return *p;
}
int *pointer_arithmetic() {
    static int buf[10]; return buf + 100;
}
unsigned char pointer_to_u8() {
    static int buf[10]; return (int*)buf;
}
int pointer_subtraction() {
    char a[10]; char b[10]; return b-a;
}
int pointer_comparison() {
    char a[10]; char b[10]; return b<a;
}
int shift_overrun(int x) {
    return x << 123;
}
int shift_negative() {
    return -1 << 1;
}
int int_overflow() {
    int intmax = (~0U) >> 1; return intmax * 2;
}
void string_literal() {
    *((char *)"hello") = 0;
}
int uninit() {
    int x; return x + 2;
}