compiler-rt/test/msan/libatomic_load_exceptions.cpp

   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
  16 int 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
  25 void 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]]