1 // RUN: %clangxx_msan -fexceptions -fsanitize-memory-track-origins=2 %libatomic -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SHADOW 2 3 // PPC has no libatomic 4 // UNSUPPORTED: powerpc64-target-arch 5 // UNSUPPORTED: powerpc64le-target-arch 6 7 #include <sanitizer/msan_interface.h> 8 #include <stdatomic.h> 9 10 typedef struct __attribute((packed)) { 11 uint8_t val[3]; 12 } i24; 13 14 void copy(i24 *dst, i24 *src); 15 main()16int main() { 17 i24 uninit; 18 i24 init = {0}; 19 20 __msan_check_mem_is_initialized(&init, 3); 21 copy(&init, &uninit); 22 __msan_check_mem_is_initialized(&init, 3); 23 } 24 copy(i24 * dst,i24 * src)25void copy(i24 *dst, i24 *src) { 26 try { 27 __atomic_load(src, dst, __ATOMIC_RELAXED); 28 } catch (...) { 29 } 30 } 31 32 // CHECK: MemorySanitizer: use-of-uninitialized-value 33 // CHECK: #0 {{0x[a-f0-9]+}} in main{{.*}}libatomic_load_exceptions.cpp:[[@LINE-11]] 34 35 // CHECK-SHADOW: Uninitialized value was stored to memory at 36 // CHECK-SHADOW: #0 {{0x[a-f0-9]+}} in copy{{.*}}libatomic_load_exceptions.cpp:[[@LINE-9]] 37