1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -fblocks -Wnull-arithmetic -verify -Wno-string-plus-int -Wno-tautological-pointer-compare %s
2 #include <stddef.h>
3 
f()4 void f() {
5   int a;
6   bool b;
7   void (^c)();
8   class X;
9   void (X::*d) ();
10   extern void e();
11   int f[2];
12   const void *v;
13 
14   a = 0 ? NULL + a : a + NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
15   a = 0 ? NULL - a : a - NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
16   a = 0 ? NULL / a : a / NULL; // expected-warning 2{{use of NULL in arithmetic operation}} \
17                                // expected-warning {{division by zero is undefined}}
18   a = 0 ? NULL * a : a * NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
19   a = 0 ? NULL >> a : a >> NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
20   a = 0 ? NULL << a : a << NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
21   a = 0 ? NULL % a : a % NULL; // expected-warning 2{{use of NULL in arithmetic operation}} \
22                                   expected-warning {{remainder by zero is undefined}}
23   a = 0 ? NULL & a : a & NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
24   a = 0 ? NULL | a : a | NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
25   a = 0 ? NULL ^ a : a ^ NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
26 
27   // Check for warnings or errors when doing arithmetic on pointers and other
28   // types.
29   v = 0 ? NULL + &a : &a + NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
30   v = 0 ? NULL + c : c + NULL; // \
31     expected-error {{invalid operands to binary expression ('long' and 'void (^)()')}} \
32     expected-error {{invalid operands to binary expression ('void (^)()' and 'long')}}
33   v = 0 ? NULL + d : d + NULL; // \
34     expected-error {{invalid operands to binary expression ('long' and 'void (X::*)()')}} \
35     expected-error {{invalid operands to binary expression ('void (X::*)()' and 'long')}}
36   v = 0 ? NULL + e : e + NULL; // expected-error 2{{arithmetic on a pointer to the function type 'void ()'}}
37   v = 0 ? NULL + f : f + NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
38   v = 0 ? NULL + "f" : "f" + NULL; // expected-warning 2{{use of NULL in arithmetic operation}}
39 
40   // Using two NULLs should only give one error instead of two.
41   a = NULL + NULL; // expected-warning{{use of NULL in arithmetic operation}}
42   a = NULL - NULL; // expected-warning{{use of NULL in arithmetic operation}}
43   a = NULL / NULL; // expected-warning{{use of NULL in arithmetic operation}} \
44                    // expected-warning{{division by zero is undefined}}
45   a = NULL * NULL; // expected-warning{{use of NULL in arithmetic operation}}
46   a = NULL >> NULL; // expected-warning{{use of NULL in arithmetic operation}}
47   a = NULL << NULL; // expected-warning{{use of NULL in arithmetic operation}}
48   a = NULL % NULL; // expected-warning{{use of NULL in arithmetic operation}} \
49                    // expected-warning{{remainder by zero is undefined}}
50   a = NULL & NULL; // expected-warning{{use of NULL in arithmetic operation}}
51   a = NULL | NULL; // expected-warning{{use of NULL in arithmetic operation}}
52   a = NULL ^ NULL; // expected-warning{{use of NULL in arithmetic operation}}
53 
54   a += NULL; // expected-warning{{use of NULL in arithmetic operation}}
55   a -= NULL; // expected-warning{{use of NULL in arithmetic operation}}
56   a /= NULL; // expected-warning{{use of NULL in arithmetic operation}} \
57              // expected-warning{{division by zero is undefined}}
58   a *= NULL; // expected-warning{{use of NULL in arithmetic operation}}
59   a >>= NULL; // expected-warning{{use of NULL in arithmetic operation}}
60   a <<= NULL; // expected-warning{{use of NULL in arithmetic operation}}
61   a %= NULL; // expected-warning{{use of NULL in arithmetic operation}} \
62              // expected-warning{{remainder by zero is undefined}}
63   a &= NULL; // expected-warning{{use of NULL in arithmetic operation}}
64   a |= NULL; // expected-warning{{use of NULL in arithmetic operation}}
65   a ^= NULL; // expected-warning{{use of NULL in arithmetic operation}}
66 
67   b = a < NULL || a > NULL; // expected-warning 2{{comparison between NULL and non-pointer ('int' and NULL)}}
68   b = NULL < a || NULL > a; // expected-warning 2{{comparison between NULL and non-pointer (NULL and 'int')}}
69   b = a <= NULL || a >= NULL; // expected-warning 2{{comparison between NULL and non-pointer ('int' and NULL)}}
70   b = NULL <= a || NULL >= a; // expected-warning 2{{comparison between NULL and non-pointer (NULL and 'int')}}
71   b = a == NULL || a != NULL; // expected-warning 2{{comparison between NULL and non-pointer ('int' and NULL)}}
72   b = NULL == a || NULL != a; // expected-warning 2{{comparison between NULL and non-pointer (NULL and 'int')}}
73 
74   b = &a < NULL || NULL < &a || &a > NULL || NULL > &a; // expected-error 4{{ordered comparison between pointer and zero}}
75   b = &a <= NULL || NULL <= &a || &a >= NULL || NULL >= &a; // expected-error 4{{ordered comparison between pointer and zero}}
76   b = &a == NULL || NULL == &a || &a != NULL || NULL != &a;
77 
78   b = 0 == a;
79   b = 0 == &a;
80 
81   b = NULL < NULL || NULL > NULL;
82   b = NULL <= NULL || NULL >= NULL;
83   b = NULL == NULL || NULL != NULL;
84 
85   b = ((NULL)) != a;  // expected-warning{{comparison between NULL and non-pointer (NULL and 'int')}}
86 
87   // Check that even non-standard pointers don't warn.
88   b = c == NULL || NULL == c || c != NULL || NULL != c;
89   b = d == NULL || NULL == d || d != NULL || NULL != d;
90   b = e == NULL || NULL == e || e != NULL || NULL != e;
91   b = f == NULL || NULL == f || f != NULL || NULL != f;
92   b = "f" == NULL || NULL == "f" || "f" != NULL || NULL != "f";
93 
94   return NULL; // expected-error{{void function 'f' should not return a value}}
95 }
96