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// Several types that should not warn.
9struct S1 {} s1;
10struct S2 { int x; } s2;
11struct S3 { float x, y; S1 s[4]; void (*f)(S1**); } s3;
12
13class C1 {
14  int x, y, z;
15public:
16  void foo() {}
17} c1;
18
19struct X1 { virtual void f(); } x1;
20struct X2 : virtual S1 {} x2;
21
22void test_warn() {
23  memset(&x1, 0, sizeof x1); // \
24      // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \
25      // expected-note {{explicitly cast the pointer to silence this warning}}
26  memset(&x2, 0, sizeof x2); // \
27      // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \
28      // expected-note {{explicitly cast the pointer to silence this warning}}
29
30  memmove(&x1, 0, sizeof x1); // \
31      // expected-warning{{destination for this 'memmove' call is a pointer to dynamic class 'struct X1'; vtable pointer will be overwritten}} \
32      // expected-note {{explicitly cast the pointer to silence this warning}}
33  memmove(0, &x1, sizeof x1); // \
34      // expected-warning{{source of this 'memmove' call is a pointer to dynamic class 'struct X1'; vtable pointer will be moved}} \
35      // expected-note {{explicitly cast the pointer to silence this warning}}
36  memcpy(&x1, 0, sizeof x1); // \
37      // expected-warning{{destination for this 'memcpy' call is a pointer to dynamic class 'struct X1'; vtable pointer will be overwritten}} \
38      // expected-note {{explicitly cast the pointer to silence this warning}}
39  memcpy(0, &x1, sizeof x1); // \
40      // expected-warning{{source of this 'memcpy' call is a pointer to dynamic class 'struct X1'; vtable pointer will be copied}} \
41      // expected-note {{explicitly cast the pointer to silence this warning}}
42  memcmp(&x1, 0, sizeof x1); // \
43      // expected-warning{{first operand of this 'memcmp' call is a pointer to dynamic class 'struct X1'; vtable pointer will be compared}} \
44      // expected-note {{explicitly cast the pointer to silence this warning}}
45  memcmp(0, &x1, sizeof x1); // \
46      // expected-warning{{second operand of this 'memcmp' call is a pointer to dynamic class 'struct X1'; vtable pointer will be compared}} \
47      // expected-note {{explicitly cast the pointer to silence this warning}}
48
49  __builtin_memset(&x1, 0, sizeof x1); // \
50      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
51      // expected-note {{explicitly cast the pointer to silence this warning}}
52  __builtin_memset(&x2, 0, sizeof x2); // \
53      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
54      // expected-note {{explicitly cast the pointer to silence this warning}}
55
56  __builtin_memmove(&x1, 0, sizeof x1); // \
57      // expected-warning{{destination for this '__builtin_memmove' call is a pointer to dynamic class}} \
58      // expected-note {{explicitly cast the pointer to silence this warning}}
59  __builtin_memmove(0, &x1, sizeof x1); // \
60      // expected-warning{{source of this '__builtin_memmove' call is a pointer to dynamic class}} \
61      // expected-note {{explicitly cast the pointer to silence this warning}}
62  __builtin_memcpy(&x1, 0, sizeof x1); // \
63      // expected-warning{{destination for this '__builtin_memcpy' call is a pointer to dynamic class}} \
64      // expected-note {{explicitly cast the pointer to silence this warning}}
65  __builtin_memcpy(0, &x1, sizeof x1); // \
66      // expected-warning{{source of this '__builtin_memcpy' call is a pointer to dynamic class}} \
67      // expected-note {{explicitly cast the pointer to silence this warning}}
68
69  __builtin___memset_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
70      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
71      // expected-note {{explicitly cast the pointer to silence this warning}}
72  __builtin___memset_chk(&x2, 0, sizeof x2, sizeof x2); //                    \
73      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
74      // expected-note {{explicitly cast the pointer to silence this warning}}
75
76  __builtin___memmove_chk(&x1, 0, sizeof x1, sizeof x1); //                   \
77      // expected-warning{{destination for this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
78      // expected-note {{explicitly cast the pointer to silence this warning}}
79  __builtin___memmove_chk(0, &x1, sizeof x1, sizeof x1); //                   \
80      // expected-warning{{source of this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
81      // expected-note {{explicitly cast the pointer to silence this warning}}
82  __builtin___memcpy_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
83      // expected-warning{{destination for this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
84      // expected-note {{explicitly cast the pointer to silence this warning}}
85  __builtin___memcpy_chk(0, &x1, sizeof x1, sizeof x1); //                    \
86      // expected-warning{{source of this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
87      // expected-note {{explicitly cast the pointer to silence this warning}}
88}
89
90void test_nowarn(void *void_ptr) {
91  int i, *iptr;
92  float y;
93  char c;
94
95  memset(&i, 0, sizeof i);
96  memset(&iptr, 0, sizeof iptr);
97  memset(&y, 0, sizeof y);
98  memset(&c, 0, sizeof c);
99  memset(void_ptr, 0, 42);
100  memset(&s1, 0, sizeof s1);
101  memset(&s2, 0, sizeof s2);
102  memset(&s3, 0, sizeof s3);
103  memset(&c1, 0, sizeof c1);
104
105  // Unevaluated code shouldn't warn.
106  (void)sizeof memset(&x1, 0, sizeof x1);
107
108  // Dead code shouldn't warn.
109  if (false) memset(&x1, 0, sizeof x1);
110}
111
112namespace N {
113  void *memset(void *, int, unsigned);
114  void test_nowarn() {
115    N::memset(&x1, 0, sizeof x1);
116  }
117}
118