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
9 // Redeclare without the extern "C" to test that we still figure out that this
10 // is the "real" memset.
11 void *memset(void *, int, unsigned);
12
13 // Several types that should not warn.
14 struct S1 {} s1;
15 struct S2 { int x; } s2;
16 struct S3 { float x, y; S1 s[4]; void (*f)(S1**); } s3;
17
18 class C1 {
19 int x, y, z;
20 public:
foo()21 void foo() {}
22 } c1;
23
24 struct X1 { virtual void f(); } x1;
25 struct X2 : virtual S1 {} x2;
26
27 struct ContainsDynamic { X1 dynamic; } contains_dynamic;
28 struct DeepContainsDynamic { ContainsDynamic m; } deep_contains_dynamic;
29 struct ContainsArrayDynamic { X1 dynamic[1]; } contains_array_dynamic;
30 struct ContainsPointerDynamic { X1 *dynamic; } contains_pointer_dynamic;
31
test_warn()32 void 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
test_nowarn(void * void_ptr)110 void 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
134 namespace N {
135 void *memset(void *, int, unsigned);
test_nowarn()136 void test_nowarn() {
137 N::memset(&x1, 0, sizeof x1);
138 }
139 }
140