string.c revision 19c5dd120e42b1ba0642309a185c70f4a41aadbd 
1// RUN: %clang_cc1 -analyze -Wwrite-strings -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-experimental-checks -verify %s
2// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -Wwrite-strings -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-experimental-checks -verify %s
3// RUN: %clang_cc1 -analyze -DVARIANT -Wwrite-strings -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-experimental-checks -verify %s
4// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -DVARIANT -Wwrite-strings -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-experimental-checks -verify %s
5
6//===----------------------------------------------------------------------===
7// Declarations
8//===----------------------------------------------------------------------===
9
10// Some functions are so similar to each other that they follow the same code
11// path, such as memcpy and __memcpy_chk, or memcmp and bcmp. If VARIANT is
12// defined, make sure to use the variants instead to make sure they are still
13// checked by the analyzer.
14
15// Some functions are implemented as builtins. These should be #defined as
16// BUILTIN(f), which will prepend "__builtin_" if USE_BUILTINS is defined.
17
18// Functions that have variants and are also availabe as builtins should be
19// declared carefully! See memcpy() for an example.
20
21#ifdef USE_BUILTINS
22# define BUILTIN(f) __builtin_ ## f
23#else /* USE_BUILTINS */
24# define BUILTIN(f) f
25#endif /* USE_BUILTINS */
26
27typedef typeof(sizeof(int)) size_t;
28
29//===----------------------------------------------------------------------===
30// strlen()
31//===----------------------------------------------------------------------===
32
33#define strlen BUILTIN(strlen)
34size_t strlen(const char *s);
35
36void strlen_constant0() {
37  if (strlen("123") != 3)
38    (void)*(char*)0; // expected-warning{{never executed}}
39}
40
41void strlen_constant1() {
42  const char *a = "123";
43  if (strlen(a) != 3)
44    (void)*(char*)0; // expected-warning{{never executed}}
45}
46
47void strlen_constant2(char x) {
48  char a[] = "123";
49  a[0] = x;
50  if (strlen(a) != 3)
51    (void)*(char*)0; // expected-warning{{null}}
52}
53
54size_t strlen_null() {
55  return strlen(0); // expected-warning{{Null pointer argument in call to byte string function}}
56}
57
58size_t strlen_fn() {
59  return strlen((char*)&strlen_fn); // expected-warning{{Argument to byte string function is the address of the function 'strlen_fn', which is not a null-terminated string}}
60}
61
62size_t strlen_nonloc() {
63label:
64  return strlen((char*)&&label); // expected-warning{{Argument to byte string function is the address of the label 'label', which is not a null-terminated string}}
65}
66