compiler-rt/test/msan/libatomic.c

   1 // RUN: %clang_msan -fsanitize-memory-track-origins=2 %libatomic -DTEST_STORE -O0 %s -o %t && %run %t 2>&1
   2 // RUN: %clang_msan -fsanitize-memory-track-origins=0 %libatomic -DTEST_LOAD -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK
   3 // RUN: %clang_msan -fsanitize-memory-track-origins=2 %libatomic -DTEST_LOAD -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SHADOW
   4
   5 // PPC has no libatomic
   6 // UNSUPPORTED: powerpc64-target-arch
   7 // UNSUPPORTED: powerpc64le-target-arch
   8
   9 #include <sanitizer/msan_interface.h>
  10 #include <stdatomic.h>
  11
  12 typedef struct __attribute((packed)) {
  13   uint8_t val[3];
  14 } i24;
  15
  16 void copy(i24 *dst, i24 *src);
  17
  18 int main() {
  19   i24 uninit;
  20   i24 init = {0};
  21
  22   __msan_check_mem_is_initialized(&init, 3);
  23   copy(&init, &uninit);
  24   __msan_check_mem_is_initialized(&init, 3);
  25 }
  26
  27 void copy(i24 *dst, i24 *src) {
  28 #ifdef TEST_LOAD
  29   __atomic_load(src, dst, __ATOMIC_RELAXED);
  30
  31   // CHECK: MemorySanitizer: use-of-uninitialized-value
  32   // CHECK: #0 {{0x[a-f0-9]+}} in main{{.*}}libatomic.c:[[@LINE-8]]
  33
  34   // CHECK-SHADOW: Uninitialized value was stored to memory at
  35   // CHECK-SHADOW: #0 {{0x[a-f0-9]+}} in copy{{.*}}libatomic.c:[[@LINE-6]]
  36 #endif
  37 #ifdef TEST_STORE
  38   // Store always writes a clean shadow
  39   __atomic_store(src, dst, __ATOMIC_RELAXED);
  40 #endif
  41 }