| 1 | // RUN: %clang_tysan -O0 %s -o %t && %run %t >%t.out.0 2>&1 |
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| 2 | // RUN: FileCheck %s < %t.out.0 |
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| 3 | // RUN: %clang_tysan -O2 %s -o %t && %run %t >%t.out 2>&1 |
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| 4 | // RUN: FileCheck %s < %t.out |
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| 5 | |
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| 6 | #include <stdio.h> |
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| 7 | |
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| 8 | // There's no type-based-aliasing violation here: the memcpy is implemented |
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| 9 | // using only char* or unsigned char* (both of which may alias anything). |
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| 10 | // CHECK-NOT: ERROR: TypeSanitizer: type-aliasing-violation |
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| 11 | |
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| 12 | void my_memcpy_uchar(void *dest, void *src, int n) { |
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| 13 | unsigned char *p = dest, *q = src, *end = p + n; |
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| 14 | while (p < end) |
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| 15 | *p++ = *q++; |
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| 16 | } |
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| 17 | |
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| 18 | void my_memcpy_char(void *dest, void *src, int n) { |
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| 19 | char *p = dest, *q = src, *end = p + n; |
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| 20 | while (p < end) |
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| 21 | *p++ = *q++; |
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| 22 | } |
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| 23 | |
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| 24 | void test_uchar() { |
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| 25 | struct S { |
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| 26 | short x; |
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| 27 | short *r; |
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| 28 | } s = {10, &s.x}, s2; |
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| 29 | my_memcpy_uchar(dest: &s2, src: &s, n: sizeof(struct S)); |
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| 30 | printf(format: "%d\n" , *(s2.r)); |
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| 31 | } |
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| 32 | |
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| 33 | void test_char() { |
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| 34 | struct S { |
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| 35 | short x; |
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| 36 | short *r; |
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| 37 | } s = {10, &s.x}, s2; |
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| 38 | my_memcpy_char(dest: &s2, src: &s, n: sizeof(struct S)); |
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| 39 | printf(format: "%d\n" , *(s2.r)); |
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| 40 | } |
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| 41 | |
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| 42 | int main() { |
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| 43 | test_uchar(); |
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| 44 | test_char(); |
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| 45 | } |
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| 46 | |
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