llvm / clang / c6d149249952dca405a25fd043da864ddf71301f / . / test / SemaCXX / null_in_arithmetic_ops.cpp

// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -fblocks -Wnull-arithmetic -verify -Wno-string-plus-int -Wno-tautological-pointer-compare %s | |

#include <stddef.h> | |

void f() { | |

int a; | |

bool b; | |

void (^c)(); | |

class X; | |

void (X::*d) (); | |

extern void e(); | |

int f[2]; | |

const void *v; | |

a = 0 ? NULL + a : a + NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

a = 0 ? NULL - a : a - NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

a = 0 ? NULL / a : a / NULL; // expected-warning 2{{use of NULL in arithmetic operation}} \ | |

// expected-warning {{division by zero is undefined}} | |

a = 0 ? NULL * a : a * NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

a = 0 ? NULL >> a : a >> NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

a = 0 ? NULL << a : a << NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

a = 0 ? NULL % a : a % NULL; // expected-warning 2{{use of NULL in arithmetic operation}} \ | |

expected-warning {{remainder by zero is undefined}} | |

a = 0 ? NULL & a : a & NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

a = 0 ? NULL | a : a | NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

a = 0 ? NULL ^ a : a ^ NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

// Check for warnings or errors when doing arithmetic on pointers and other | |

// types. | |

v = 0 ? NULL + &a : &a + NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

v = 0 ? NULL + c : c + NULL; // \ | |

expected-error {{invalid operands to binary expression ('long' and 'void (^)()')}} \ | |

expected-error {{invalid operands to binary expression ('void (^)()' and 'long')}} | |

v = 0 ? NULL + d : d + NULL; // \ | |

expected-error {{invalid operands to binary expression ('long' and 'void (X::*)()')}} \ | |

expected-error {{invalid operands to binary expression ('void (X::*)()' and 'long')}} | |

v = 0 ? NULL + e : e + NULL; // expected-error 2{{arithmetic on a pointer to the function type 'void ()'}} | |

v = 0 ? NULL + f : f + NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

v = 0 ? NULL + "f" : "f" + NULL; // expected-warning 2{{use of NULL in arithmetic operation}} | |

// Using two NULLs should only give one error instead of two. | |

a = NULL + NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a = NULL - NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a = NULL / NULL; // expected-warning{{use of NULL in arithmetic operation}} \ | |

// expected-warning{{division by zero is undefined}} | |

a = NULL * NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a = NULL >> NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a = NULL << NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a = NULL % NULL; // expected-warning{{use of NULL in arithmetic operation}} \ | |

// expected-warning{{remainder by zero is undefined}} | |

a = NULL & NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a = NULL | NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a = NULL ^ NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a += NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a -= NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a /= NULL; // expected-warning{{use of NULL in arithmetic operation}} \ | |

// expected-warning{{division by zero is undefined}} | |

a *= NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a >>= NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a <<= NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a %= NULL; // expected-warning{{use of NULL in arithmetic operation}} \ | |

// expected-warning{{remainder by zero is undefined}} | |

a &= NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a |= NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

a ^= NULL; // expected-warning{{use of NULL in arithmetic operation}} | |

b = a < NULL || a > NULL; // expected-warning 2{{comparison between NULL and non-pointer ('int' and NULL)}} | |

b = NULL < a || NULL > a; // expected-warning 2{{comparison between NULL and non-pointer (NULL and 'int')}} | |

b = a <= NULL || a >= NULL; // expected-warning 2{{comparison between NULL and non-pointer ('int' and NULL)}} | |

b = NULL <= a || NULL >= a; // expected-warning 2{{comparison between NULL and non-pointer (NULL and 'int')}} | |

b = a == NULL || a != NULL; // expected-warning 2{{comparison between NULL and non-pointer ('int' and NULL)}} | |

b = NULL == a || NULL != a; // expected-warning 2{{comparison between NULL and non-pointer (NULL and 'int')}} | |

b = &a < NULL || NULL < &a || &a > NULL || NULL > &a; // expected-error 4{{ordered comparison between pointer and zero}} | |

b = &a <= NULL || NULL <= &a || &a >= NULL || NULL >= &a; // expected-error 4{{ordered comparison between pointer and zero}} | |

b = &a == NULL || NULL == &a || &a != NULL || NULL != &a; | |

b = 0 == a; | |

b = 0 == &a; | |

b = NULL < NULL || NULL > NULL; | |

b = NULL <= NULL || NULL >= NULL; | |

b = NULL == NULL || NULL != NULL; | |

b = ((NULL)) != a; // expected-warning{{comparison between NULL and non-pointer (NULL and 'int')}} | |

// Check that even non-standard pointers don't warn. | |

b = c == NULL || NULL == c || c != NULL || NULL != c; | |

b = d == NULL || NULL == d || d != NULL || NULL != d; | |

b = e == NULL || NULL == e || e != NULL || NULL != e; | |

b = f == NULL || NULL == f || f != NULL || NULL != f; | |

b = "f" == NULL || NULL == "f" || "f" != NULL || NULL != "f"; | |

return NULL; // expected-error{{void function 'f' should not return a value}} | |

} |