forked from OSchip/llvm-project
102 lines
3.1 KiB
C++
102 lines
3.1 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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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 {{argument to 'sizeof' in 'memset' call is the same expression as the destination}}
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memset(ps, 0, sizeof(ps)); // \
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// expected-warning {{argument to 'sizeof' in 'memset' call is the same expression as the destination}}
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memset(ps2, 0, sizeof(ps2)); // \
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// expected-warning {{argument to 'sizeof' in 'memset' call is the same expression as the destination}}
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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 {{argument to 'sizeof' in 'memset' call is the same expression as the destination}}
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memcpy(&s, 0, sizeof(&s)); // \
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// expected-warning {{argument to 'sizeof' in 'memcpy' call is the same expression as the destination}}
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memcpy(0, &s, sizeof(&s)); // \
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// expected-warning {{argument to 'sizeof' in 'memcpy' call is the same expression as the source}}
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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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}
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