зеркало из https://github.com/microsoft/clang-1.git
146 строки
6.1 KiB
C++
146 строки
6.1 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -Wno-sizeof-array-argument %s
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//
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extern "C" void *memset(void *, int, unsigned);
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extern "C" void *memmove(void *s1, const void *s2, unsigned n);
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extern "C" void *memcpy(void *s1, const void *s2, unsigned n);
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extern "C" void *memcmp(void *s1, const void *s2, unsigned n);
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struct S {int a, b, c, d;};
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typedef S* PS;
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struct Foo {};
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typedef const Foo& CFooRef;
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typedef const Foo CFoo;
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typedef volatile Foo VFoo;
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typedef const volatile Foo CVFoo;
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typedef double Mat[4][4];
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template <class Dest, class Source>
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inline Dest bit_cast(const Source& source) {
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Dest dest;
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memcpy(&dest, &source, sizeof(dest));
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return dest;
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}
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// http://www.lysator.liu.se/c/c-faq/c-2.html#2-6
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void f(Mat m, const Foo& const_foo, char *buffer) {
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S s;
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S* ps = &s;
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PS ps2 = &s;
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char arr[5];
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char* parr[5];
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Foo foo;
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char* heap_buffer = new char[42];
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/* Should warn */
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memset(&s, 0, sizeof(&s)); // \
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// expected-warning {{'memset' call operates on objects of type 'S' while the size is based on a different type 'S *'}} expected-note{{did you mean to remove the addressof in the argument to 'sizeof' (and multiply it by the number of elements)?}}
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memset(ps, 0, sizeof(ps)); // \
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// expected-warning {{'memset' call operates on objects of type 'S' while the size is based on a different type 'S *'}} expected-note{{did you mean to dereference the argument to 'sizeof' (and multiply it by the number of elements)?}}
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memset(ps2, 0, sizeof(ps2)); // \
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// expected-warning {{'memset' call operates on objects of type 'S' while the size is based on a different type 'PS' (aka 'S *')}} expected-note{{did you mean to dereference the argument to 'sizeof' (and multiply it by the number of elements)?}}
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memset(ps2, 0, sizeof(typeof(ps2))); // \
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// expected-warning {{argument to 'sizeof' in 'memset' call is the same pointer type}}
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memset(ps2, 0, sizeof(PS)); // \
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// expected-warning {{argument to 'sizeof' in 'memset' call is the same pointer type}}
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memset(heap_buffer, 0, sizeof(heap_buffer)); // \
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// expected-warning {{'memset' call operates on objects of type 'char' while the size is based on a different type 'char *'}} expected-note{{did you mean to provide an explicit length?}}
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memcpy(&s, 0, sizeof(&s)); // \
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// expected-warning {{'memcpy' call operates on objects of type 'S' while the size is based on a different type 'S *'}} expected-note{{did you mean to remove the addressof in the argument to 'sizeof' (and multiply it by the number of elements)?}}
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memcpy(0, &s, sizeof(&s)); // \
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// expected-warning {{'memcpy' call operates on objects of type 'S' while the size is based on a different type 'S *'}} expected-note{{did you mean to remove the addressof in the argument to 'sizeof' (and multiply it by the number of elements)?}}
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memmove(ps, 0, sizeof(ps)); // \
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// expected-warning {{'memmove' call operates on objects of type 'S' while the size is based on a different type 'S *'}} expected-note{{did you mean to dereference the argument to 'sizeof' (and multiply it by the number of elements)?}}
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memcmp(ps, 0, sizeof(ps)); // \
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// expected-warning {{'memcmp' call operates on objects of type 'S' while the size is based on a different type 'S *'}} expected-note{{did you mean to dereference the argument to 'sizeof' (and multiply it by the number of elements)?}}
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/* Shouldn't warn */
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memset((void*)&s, 0, sizeof(&s));
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memset(&s, 0, sizeof(s));
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memset(&s, 0, sizeof(S));
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memset(&s, 0, sizeof(const S));
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memset(&s, 0, sizeof(volatile S));
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memset(&s, 0, sizeof(volatile const S));
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memset(&foo, 0, sizeof(CFoo));
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memset(&foo, 0, sizeof(VFoo));
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memset(&foo, 0, sizeof(CVFoo));
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memset(ps, 0, sizeof(*ps));
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memset(ps2, 0, sizeof(*ps2));
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memset(ps2, 0, sizeof(typeof(*ps2)));
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memset(arr, 0, sizeof(arr));
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memset(parr, 0, sizeof(parr));
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memcpy(&foo, &const_foo, sizeof(Foo));
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memcpy((void*)&s, 0, sizeof(&s));
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memcpy(0, (void*)&s, sizeof(&s));
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char *cptr;
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memcpy(&cptr, buffer, sizeof(cptr));
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memcpy((char*)&cptr, buffer, sizeof(cptr));
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CFooRef cfoo = foo;
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memcpy(&foo, &cfoo, sizeof(Foo));
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memcpy(0, &arr, sizeof(arr));
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typedef char Buff[8];
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memcpy(0, &arr, sizeof(Buff));
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unsigned char* puc;
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bit_cast<char*>(puc);
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float* pf;
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bit_cast<int*>(pf);
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int iarr[14];
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memset(&iarr[0], 0, sizeof iarr);
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int* iparr[14];
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memset(&iparr[0], 0, sizeof iparr);
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memset(m, 0, sizeof(Mat));
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// Copy to raw buffer shouldn't warn either
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memcpy(&foo, &arr, sizeof(Foo));
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memcpy(&arr, &foo, sizeof(Foo));
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// Shouldn't warn, and shouldn't crash either.
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memset(({
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if (0) {}
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while (0) {}
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for (;;) {}
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&s;
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}), 0, sizeof(s));
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}
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namespace ns {
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void memset(void* s, char c, int n);
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void f(int* i) {
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memset(i, 0, sizeof(i));
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}
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}
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extern "C" int strncmp(const char *s1, const char *s2, unsigned n);
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extern "C" int strncasecmp(const char *s1, const char *s2, unsigned n);
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extern "C" char *strncpy(char *det, const char *src, unsigned n);
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extern "C" char *strncat(char *dst, const char *src, unsigned n);
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extern "C" char *strndup(const char *src, unsigned n);
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void strcpy_and_friends() {
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const char* FOO = "<- should be an array instead";
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const char* BAR = "<- this, too";
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strncmp(FOO, BAR, sizeof(FOO)); // \
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// expected-warning {{'strncmp' call operates on objects of type 'const char' while the size is based on a different type 'const char *'}} expected-note{{did you mean to provide an explicit length?}}
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strncasecmp(FOO, BAR, sizeof(FOO)); // \
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// expected-warning {{'strncasecmp' call operates on objects of type 'const char' while the size is based on a different type 'const char *'}} expected-note{{did you mean to provide an explicit length?}}
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char buff[80];
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strncpy(buff, BAR, sizeof(BAR)); // \
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// expected-warning {{'strncpy' call operates on objects of type 'const char' while the size is based on a different type 'const char *'}} expected-note{{did you mean to provide an explicit length?}}
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strndup(FOO, sizeof(FOO)); // \
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// expected-warning {{'strndup' call operates on objects of type 'const char' while the size is based on a different type 'const char *'}} expected-note{{did you mean to provide an explicit length?}}
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}
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