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