1 files changed, 45 insertions, 0 deletions
diff --git a/lib/msan/tests/msan_loadable.cc b/lib/msan/tests/msan_loadable.cc
new file mode 100644
index 000000000000..db3bf489853d
--- /dev/null
+++ b/lib/msan/tests/msan_loadable.cc
@@ -0,0 +1,45 @@
+//===-- msan_loadable.cc --------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemorySanitizer.
+//
+// MemorySanitizer unit tests.
+//===----------------------------------------------------------------------===//
+
+#include "msan/msan_interface_internal.h"
+#include <stdlib.h>
+
+static void *dso_global;
+
+// No name mangling.
+extern "C" {
+
+__attribute__((constructor))
+void loadable_module_init(void) {
+  if (!__msan_has_dynamic_component())
+    return;
+  // The real test is that this compare should not make an uninit.
+  if (dso_global == NULL)
+    dso_global = malloc(4);
+}
+
+__attribute__((destructor))
+void loadable_module_fini(void) {
+  if (!__msan_has_dynamic_component())
+    return;
+  free(dso_global);
+  // *Don't* overwrite it with NULL!  That would unpoison it, but our test
+  // relies on reloading at the same address and keeping the poison.
+}
+
+void **get_dso_global() {
+  return &dso_global;
+}
+
+}