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