164 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -Wdynamic-class-memaccess -verify %s2 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" int memcmp(void *s1, const void *s2, unsigned n);7extern "C" int bcmp(void *s1, const void *s2, unsigned n);8 9 10// Redeclare without the extern "C" to test that we still figure out that this11// is the "real" memset.12void *memset(void *, int, unsigned);13 14// Several types that should not warn.15struct S1 {} s1;16struct S2 { int x; } s2;17struct S3 { float x, y; S1 s[4]; void (*f)(S1**); } s3;18 19class C1 {20 int x, y, z;21public:22 void foo() {}23} c1;24 25struct X1 { virtual void f(); } x1, x1arr[2];26struct X2 : virtual S1 {} x2;27 28struct ContainsDynamic { X1 dynamic; } contains_dynamic;29struct DeepContainsDynamic { ContainsDynamic m; } deep_contains_dynamic;30struct ContainsArrayDynamic { X1 dynamic[1]; } contains_array_dynamic;31struct ContainsPointerDynamic { X1 *dynamic; } contains_pointer_dynamic;32 33void test_warn() {34 memset(&x1, 0, sizeof x1); // \35 // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \36 // expected-note {{explicitly cast the pointer to silence this warning}}37 memset(x1arr, 0, sizeof x1arr); // \38 // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \39 // expected-note {{explicitly cast the pointer to silence this warning}}40 memset((void*)x1arr, 0, sizeof x1arr);41 memset(&x2, 0, sizeof x2); // \42 // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \43 // expected-note {{explicitly cast the pointer to silence this warning}}44 45 memmove(&x1, 0, sizeof x1); // \46 // expected-warning{{destination for this 'memmove' call is a pointer to dynamic class 'X1'; vtable pointer will be overwritten}} \47 // expected-note {{explicitly cast the pointer to silence this warning}}48 memmove(0, &x1, sizeof x1); // \49 // expected-warning{{source of this 'memmove' call is a pointer to dynamic class 'X1'; vtable pointer will be moved}} \50 // expected-note {{explicitly cast the pointer to silence this warning}}51 memcpy(&x1, 0, sizeof x1); // \52 // expected-warning{{destination for this 'memcpy' call is a pointer to dynamic class 'X1'; vtable pointer will be overwritten}} \53 // expected-note {{explicitly cast the pointer to silence this warning}}54 memcpy(0, &x1, sizeof x1); // \55 // expected-warning{{source of this 'memcpy' call is a pointer to dynamic class 'X1'; vtable pointer will be copied}} \56 // expected-note {{explicitly cast the pointer to silence this warning}}57 memcmp(&x1, 0, sizeof x1); // \58 // expected-warning{{first operand of this 'memcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \59 // expected-note {{explicitly cast the pointer to silence this warning}}60 memcmp(0, &x1, sizeof x1); // \61 // expected-warning{{second operand of this 'memcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \62 // expected-note {{explicitly cast the pointer to silence this warning}}63 bcmp(&x1, 0, sizeof x1); // \64 // expected-warning{{first operand of this 'bcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \65 // expected-note {{explicitly cast the pointer to silence this warning}}66 bcmp(0, &x1, sizeof x1); // \67 // expected-warning{{second operand of this 'bcmp' call is a pointer to dynamic class 'X1'; vtable pointer will be compared}} \68 // expected-note {{explicitly cast the pointer to silence this warning}}69 70 __builtin_memset(&x1, 0, sizeof x1); // \71 // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \72 // expected-note {{explicitly cast the pointer to silence this warning}}73 __builtin_memset(&x2, 0, sizeof x2); // \74 // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \75 // expected-note {{explicitly cast the pointer to silence this warning}}76 77 __builtin_memmove(&x1, 0, sizeof x1); // \78 // expected-warning{{destination for this '__builtin_memmove' call is a pointer to dynamic class}} \79 // expected-note {{explicitly cast the pointer to silence this warning}}80 __builtin_memmove(0, &x1, sizeof x1); // \81 // expected-warning{{source of this '__builtin_memmove' call is a pointer to dynamic class}} \82 // expected-note {{explicitly cast the pointer to silence this warning}}83 __builtin_memcpy(&x1, 0, sizeof x1); // \84 // expected-warning{{destination for this '__builtin_memcpy' call is a pointer to dynamic class}} \85 // expected-note {{explicitly cast the pointer to silence this warning}}86 __builtin_memcpy(0, &x1, sizeof x1); // \87 // expected-warning{{source of this '__builtin_memcpy' call is a pointer to dynamic class}} \88 // expected-note {{explicitly cast the pointer to silence this warning}}89 90 __builtin___memset_chk(&x1, 0, sizeof x1, sizeof x1); // \91 // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \92 // expected-note {{explicitly cast the pointer to silence this warning}}93 __builtin___memset_chk(&x2, 0, sizeof x2, sizeof x2); // \94 // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \95 // expected-note {{explicitly cast the pointer to silence this warning}}96 97 __builtin___memmove_chk(&x1, 0, sizeof x1, sizeof x1); // \98 // expected-warning{{destination for this '__builtin___memmove_chk' call is a pointer to dynamic class}} \99 // expected-note {{explicitly cast the pointer to silence this warning}}100 __builtin___memmove_chk(0, &x1, sizeof x1, sizeof x1); // \101 // expected-warning{{source of this '__builtin___memmove_chk' call is a pointer to dynamic class}} \102 // expected-note {{explicitly cast the pointer to silence this warning}}103 __builtin___memcpy_chk(&x1, 0, sizeof x1, sizeof x1); // \104 // expected-warning{{destination for this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \105 // expected-note {{explicitly cast the pointer to silence this warning}}106 __builtin___memcpy_chk(0, &x1, sizeof x1, sizeof x1); // \107 // expected-warning{{source of this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \108 // expected-note {{explicitly cast the pointer to silence this warning}}109 110 // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}111 // expected-note@+1 {{explicitly cast the pointer to silence this warning}}112 memset(&contains_dynamic, 0, sizeof(contains_dynamic));113 // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}114 // expected-note@+1 {{explicitly cast the pointer to silence this warning}}115 memset(&deep_contains_dynamic, 0, sizeof(deep_contains_dynamic));116 // expected-warning@+2 {{destination for this 'memset' call is a pointer to class containing a dynamic class 'X1'}}117 // expected-note@+1 {{explicitly cast the pointer to silence this warning}}118 memset(&contains_array_dynamic, 0, sizeof(contains_array_dynamic));119}120 121void test_nowarn(void *void_ptr) {122 int i, *iptr;123 float y;124 char c;125 126 memset(&i, 0, sizeof i);127 memset(&iptr, 0, sizeof iptr);128 memset(&y, 0, sizeof y);129 memset(&c, 0, sizeof c);130 memset(void_ptr, 0, 42);131 memset(&s1, 0, sizeof s1);132 memset(&s2, 0, sizeof s2);133 memset(&s3, 0, sizeof s3);134 memset(&c1, 0, sizeof c1);135 136 memset(&contains_pointer_dynamic, 0, sizeof(contains_pointer_dynamic));137 138 // Unevaluated code shouldn't warn.139 (void)sizeof memset(&x1, 0, sizeof x1);140 141 // Dead code shouldn't warn.142 if (false) memset(&x1, 0, sizeof x1);143}144 145namespace N {146 void *memset(void *, int, unsigned);147 void test_nowarn() {148 N::memset(&x1, 0, sizeof x1);149 }150}151 152namespace recursive_class {153struct S {154 S v;155 // expected-error@-1{{field has incomplete type 'S'}}156 // expected-note@-3{{definition of 'recursive_class::S' is not complete until the closing '}'}}157} a;158 159int main() {160 __builtin_memset(&a, 0, sizeof a);161 return 0;162}163}164