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, x1arr[2];
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(x1arr, 0, sizeof x1arr); // \
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  memset((void*)x1arr, 0, sizeof x1arr);
40  memset(&x2, 0, sizeof x2); // \
41      // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \
42      // expected-note {{explicitly cast the pointer to silence this warning}}
43
44  memmove(&x1, 0, sizeof x1); // \
45      // expected-warning{{destination for this 'memmove' call is a pointer to dynamic class 'X1'; vtable pointer will be overwritten}} \
46      // expected-note {{explicitly cast the pointer to silence this warning}}
47  memmove(0, &x1, sizeof x1); // \
48      // expected-warning{{source of this 'memmove' call is a pointer to dynamic class 'X1'; vtable pointer will be moved}} \
49      // expected-note {{explicitly cast the pointer to silence this warning}}
50  memcpy(&x1, 0, sizeof x1); // \
51      // expected-warning{{destination for this 'memcpy' call is a pointer to dynamic class 'X1'; vtable pointer will be overwritten}} \
52      // expected-note {{explicitly cast the pointer to silence this warning}}
53  memcpy(0, &x1, sizeof x1); // \
54      // expected-warning{{source of this 'memcpy' call is a pointer to dynamic class 'X1'; vtable pointer will be copied}} \
55      // expected-note {{explicitly cast the pointer to silence this warning}}
56  memcmp(&x1, 0, sizeof x1); // \
57      // expected-warning{{first operand of this 'memcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \
58      // expected-note {{explicitly cast the pointer to silence this warning}}
59  memcmp(0, &x1, sizeof x1); // \
60      // expected-warning{{second operand of this 'memcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \
61      // expected-note {{explicitly cast the pointer to silence this warning}}
62
63  __builtin_memset(&x1, 0, sizeof x1); // \
64      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
65      // expected-note {{explicitly cast the pointer to silence this warning}}
66  __builtin_memset(&x2, 0, sizeof x2); // \
67      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
68      // expected-note {{explicitly cast the pointer to silence this warning}}
69
70  __builtin_memmove(&x1, 0, sizeof x1); // \
71      // expected-warning{{destination for this '__builtin_memmove' call is a pointer to dynamic class}} \
72      // expected-note {{explicitly cast the pointer to silence this warning}}
73  __builtin_memmove(0, &x1, sizeof x1); // \
74      // expected-warning{{source of this '__builtin_memmove' call is a pointer to dynamic class}} \
75      // expected-note {{explicitly cast the pointer to silence this warning}}
76  __builtin_memcpy(&x1, 0, sizeof x1); // \
77      // expected-warning{{destination for this '__builtin_memcpy' call is a pointer to dynamic class}} \
78      // expected-note {{explicitly cast the pointer to silence this warning}}
79  __builtin_memcpy(0, &x1, sizeof x1); // \
80      // expected-warning{{source of this '__builtin_memcpy' call is a pointer to dynamic class}} \
81      // expected-note {{explicitly cast the pointer to silence this warning}}
82
83  __builtin___memset_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
84      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
85      // expected-note {{explicitly cast the pointer to silence this warning}}
86  __builtin___memset_chk(&x2, 0, sizeof x2, sizeof x2); //                    \
87      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
88      // expected-note {{explicitly cast the pointer to silence this warning}}
89
90  __builtin___memmove_chk(&x1, 0, sizeof x1, sizeof x1); //                   \
91      // expected-warning{{destination for this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
92      // expected-note {{explicitly cast the pointer to silence this warning}}
93  __builtin___memmove_chk(0, &x1, sizeof x1, sizeof x1); //                   \
94      // expected-warning{{source of this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
95      // expected-note {{explicitly cast the pointer to silence this warning}}
96  __builtin___memcpy_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
97      // expected-warning{{destination for this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
98      // expected-note {{explicitly cast the pointer to silence this warning}}
99  __builtin___memcpy_chk(0, &x1, sizeof x1, sizeof x1); //                    \
100      // expected-warning{{source of this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
101      // expected-note {{explicitly cast the pointer to silence this warning}}
102
103  // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}
104  // expected-note@+1 {{explicitly cast the pointer to silence this warning}}
105  memset(&contains_dynamic, 0, sizeof(contains_dynamic));
106  // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}
107  // expected-note@+1 {{explicitly cast the pointer to silence this warning}}
108  memset(&deep_contains_dynamic, 0, sizeof(deep_contains_dynamic));
109  // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}
110  // expected-note@+1 {{explicitly cast the pointer to silence this warning}}
111  memset(&contains_array_dynamic, 0, sizeof(contains_array_dynamic));
112}
113
114void test_nowarn(void *void_ptr) {
115  int i, *iptr;
116  float y;
117  char c;
118
119  memset(&i, 0, sizeof i);
120  memset(&iptr, 0, sizeof iptr);
121  memset(&y, 0, sizeof y);
122  memset(&c, 0, sizeof c);
123  memset(void_ptr, 0, 42);
124  memset(&s1, 0, sizeof s1);
125  memset(&s2, 0, sizeof s2);
126  memset(&s3, 0, sizeof s3);
127  memset(&c1, 0, sizeof c1);
128
129  memset(&contains_pointer_dynamic, 0, sizeof(contains_pointer_dynamic));
130
131  // Unevaluated code shouldn't warn.
132  (void)sizeof memset(&x1, 0, sizeof x1);
133
134  // Dead code shouldn't warn.
135  if (false) memset(&x1, 0, sizeof x1);
136}
137
138namespace N {
139  void *memset(void *, int, unsigned);
140  void test_nowarn() {
141    N::memset(&x1, 0, sizeof x1);
142  }
143}
144
145namespace recursive_class {
146struct S {
147  S v;
148  // expected-error@-1{{field has incomplete type 'recursive_class::S'}}
149  // expected-note@-3{{definition of 'recursive_class::S' is not complete until the closing '}'}}
150} a;
151
152int main() {
153  __builtin_memset(&a, 0, sizeof a);
154  return 0;
155}
156}
157