1// RUN: %clang_cc1 -fsyntax-only -Wdynamic-class-memaccess -verify %s
2
3extern "C" void *memset(void *, int, unsigned);
4extern "C" void *memmove(void *s1, const void *s2, unsigned n);
5extern "C" void *memcpy(void *s1, const void *s2, unsigned n);
6extern "C" void *memcmp(void *s1, const void *s2, unsigned n);
7
8
9// Redeclare without the extern "C" to test that we still figure out that this
10// is the "real" memset.
11void *memset(void *, int, unsigned);
12
13// Several types that should not warn.
14struct S1 {} s1;
15struct S2 { int x; } s2;
16struct S3 { float x, y; S1 s[4]; void (*f)(S1**); } s3;
17
18class C1 {
19  int x, y, z;
20public:
21  void foo() {}
22} c1;
23
24struct X1 { virtual void f(); } x1;
25struct X2 : virtual S1 {} x2;
26
27struct ContainsDynamic { X1 dynamic; } contains_dynamic;
28struct DeepContainsDynamic { ContainsDynamic m; } deep_contains_dynamic;
29struct ContainsArrayDynamic { X1 dynamic[1]; } contains_array_dynamic;
30struct ContainsPointerDynamic { X1 *dynamic; } contains_pointer_dynamic;
31
32void test_warn() {
33  memset(&x1, 0, sizeof x1); // \
34      // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \
35      // expected-note {{explicitly cast the pointer to silence this warning}}
36  memset(&x2, 0, sizeof x2); // \
37      // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \
38      // expected-note {{explicitly cast the pointer to silence this warning}}
39
40  memmove(&x1, 0, sizeof x1); // \
41      // expected-warning{{destination for this 'memmove' call is a pointer to dynamic class 'X1'; vtable pointer will be overwritten}} \
42      // expected-note {{explicitly cast the pointer to silence this warning}}
43  memmove(0, &x1, sizeof x1); // \
44      // expected-warning{{source of this 'memmove' call is a pointer to dynamic class 'X1'; vtable pointer will be moved}} \
45      // expected-note {{explicitly cast the pointer to silence this warning}}
46  memcpy(&x1, 0, sizeof x1); // \
47      // expected-warning{{destination for this 'memcpy' call is a pointer to dynamic class 'X1'; vtable pointer will be overwritten}} \
48      // expected-note {{explicitly cast the pointer to silence this warning}}
49  memcpy(0, &x1, sizeof x1); // \
50      // expected-warning{{source of this 'memcpy' call is a pointer to dynamic class 'X1'; vtable pointer will be copied}} \
51      // expected-note {{explicitly cast the pointer to silence this warning}}
52  memcmp(&x1, 0, sizeof x1); // \
53      // expected-warning{{first operand of this 'memcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \
54      // expected-note {{explicitly cast the pointer to silence this warning}}
55  memcmp(0, &x1, sizeof x1); // \
56      // expected-warning{{second operand of this 'memcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \
57      // expected-note {{explicitly cast the pointer to silence this warning}}
58
59  __builtin_memset(&x1, 0, sizeof x1); // \
60      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
61      // expected-note {{explicitly cast the pointer to silence this warning}}
62  __builtin_memset(&x2, 0, sizeof x2); // \
63      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
64      // expected-note {{explicitly cast the pointer to silence this warning}}
65
66  __builtin_memmove(&x1, 0, sizeof x1); // \
67      // expected-warning{{destination for this '__builtin_memmove' call is a pointer to dynamic class}} \
68      // expected-note {{explicitly cast the pointer to silence this warning}}
69  __builtin_memmove(0, &x1, sizeof x1); // \
70      // expected-warning{{source of this '__builtin_memmove' call is a pointer to dynamic class}} \
71      // expected-note {{explicitly cast the pointer to silence this warning}}
72  __builtin_memcpy(&x1, 0, sizeof x1); // \
73      // expected-warning{{destination for this '__builtin_memcpy' call is a pointer to dynamic class}} \
74      // expected-note {{explicitly cast the pointer to silence this warning}}
75  __builtin_memcpy(0, &x1, sizeof x1); // \
76      // expected-warning{{source of this '__builtin_memcpy' call is a pointer to dynamic class}} \
77      // expected-note {{explicitly cast the pointer to silence this warning}}
78
79  __builtin___memset_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
80      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
81      // expected-note {{explicitly cast the pointer to silence this warning}}
82  __builtin___memset_chk(&x2, 0, sizeof x2, sizeof x2); //                    \
83      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
84      // expected-note {{explicitly cast the pointer to silence this warning}}
85
86  __builtin___memmove_chk(&x1, 0, sizeof x1, sizeof x1); //                   \
87      // expected-warning{{destination for this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
88      // expected-note {{explicitly cast the pointer to silence this warning}}
89  __builtin___memmove_chk(0, &x1, sizeof x1, sizeof x1); //                   \
90      // expected-warning{{source of this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
91      // expected-note {{explicitly cast the pointer to silence this warning}}
92  __builtin___memcpy_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
93      // expected-warning{{destination for this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
94      // expected-note {{explicitly cast the pointer to silence this warning}}
95  __builtin___memcpy_chk(0, &x1, sizeof x1, sizeof x1); //                    \
96      // expected-warning{{source of this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
97      // expected-note {{explicitly cast the pointer to silence this warning}}
98
99  // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}
100  // expected-note@+1 {{explicitly cast the pointer to silence this warning}}
101  memset(&contains_dynamic, 0, sizeof(contains_dynamic));
102  // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}
103  // expected-note@+1 {{explicitly cast the pointer to silence this warning}}
104  memset(&deep_contains_dynamic, 0, sizeof(deep_contains_dynamic));
105  // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}
106  // expected-note@+1 {{explicitly cast the pointer to silence this warning}}
107  memset(&contains_array_dynamic, 0, sizeof(contains_array_dynamic));
108}
109
110void test_nowarn(void *void_ptr) {
111  int i, *iptr;
112  float y;
113  char c;
114
115  memset(&i, 0, sizeof i);
116  memset(&iptr, 0, sizeof iptr);
117  memset(&y, 0, sizeof y);
118  memset(&c, 0, sizeof c);
119  memset(void_ptr, 0, 42);
120  memset(&s1, 0, sizeof s1);
121  memset(&s2, 0, sizeof s2);
122  memset(&s3, 0, sizeof s3);
123  memset(&c1, 0, sizeof c1);
124
125  memset(&contains_pointer_dynamic, 0, sizeof(contains_pointer_dynamic));
126
127  // Unevaluated code shouldn't warn.
128  (void)sizeof memset(&x1, 0, sizeof x1);
129
130  // Dead code shouldn't warn.
131  if (false) memset(&x1, 0, sizeof x1);
132}
133
134namespace N {
135  void *memset(void *, int, unsigned);
136  void test_nowarn() {
137    N::memset(&x1, 0, sizeof x1);
138  }
139}
140