ptr-arith.c revision 79234ca446858707fa311cd0dfea85519ba3bbd5 
1// RUN: clang-cc -analyze -checker-cfref -analyzer-store=region -verify -triple x86_64-apple-darwin9 %s
2// RUN: clang-cc -analyze -checker-cfref -analyzer-store=region -verify -triple i686-apple-darwin9 %s
3
4void f1() {
5  int a[10];
6  int *p = a;
7  ++p;
8}
9
10char* foo();
11
12void f2() {
13  char *p = foo();
14  ++p;
15}
16
17// This test case checks if we get the right rvalue type of a TypedViewRegion.
18// The ElementRegion's type depends on the array region's rvalue type. If it was
19// a pointer type, we would get a loc::SymbolVal for '*p'.
20void* memchr();
21static int
22domain_port (const char *domain_b, const char *domain_e,
23             const char **domain_e_ptr)
24{
25  int port = 0;
26
27  const char *p;
28  const char *colon = memchr (domain_b, ':', domain_e - domain_b);
29
30  for (p = colon + 1; p < domain_e ; p++)
31    port = 10 * port + (*p - '0');
32  return port;
33}
34
35void f3() {
36  int x, y;
37  int d = &y - &x; // expected-warning{{Subtraction of two pointers that do not point to the same memory chunk may cause incorrect result.}}
38
39  int a[10];
40  int *p = &a[2];
41  int *q = &a[8];
42  d = q-p; // no-warning
43}
44
45void f4() {
46  int *p;
47  p = (int*) 0x10000; // expected-warning{{Using a fixed address is not portable because that address will probably not be valid in all environments or platforms.}}
48}
49
50void f5() {
51  int x, y;
52  int *p;
53  p = &x + 1;  // expected-warning{{Pointer arithmetic done on non-array variables means reliance on memory layout, which is dangerous.}}
54
55  int a[10];
56  p = a + 1; // no-warning
57}
58
59// Allow arithmetic on different symbolic regions.
60void f6(int *p, int *q) {
61  int d = q - p; // no-warning
62}
63