1 // RUN: %clang_cc1 -fsyntax-only -Wdynamic-class-memaccess -verify %s
2
3 extern "C" void *memset(void *, int, unsigned);
4 extern "C" void *memmove(void *s1, const void *s2, unsigned n);
5 extern "C" void *memcpy(void *s1, const void *s2, unsigned n);
6 extern "C" void *memcmp(void *s1, const void *s2, unsigned n);
7
8 // Several types that should not warn.
9 struct S1 {} s1;
10 struct S2 { int x; } s2;
11 struct S3 { float x, y; S1 s[4]; void (*f)(S1**); } s3;
12
13 class C1 {
14 int x, y, z;
15 public:
foo()16 void foo() {}
17 } c1;
18
19 struct X1 { virtual void f(); } x1;
20 struct X2 : virtual S1 {} x2;
21
test_warn()22 void 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
test_nowarn(void * void_ptr)90 void 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
112 namespace N {
113 void *memset(void *, int, unsigned);
test_nowarn()114 void test_nowarn() {
115 N::memset(&x1, 0, sizeof x1);
116 }
117 }
118