[libsymbolized] If we can't find an address in the list of shared libraries, try to reload it.

Add a regression test for the case where such behavior helps TSan:
  1. race is reported in the main module
  2. new shared library is loaded
  3. race is reported in the shared library

llvm-svn: 179032

1 files changed, 22 insertions, 0 deletions

diff --git a/compiler-rt/lib/tsan/lit_tests/SharedLibs/load_shared_lib-so.cc b/compiler-rt/lib/tsan/lit_tests/SharedLibs/load_shared_lib-so.cc
new file mode 100644
index 00000000000..d05aa6a40d1
--- /dev/null
+++ b/compiler-rt/lib/tsan/lit_tests/SharedLibs/load_shared_lib-so.cc
@@ -0,0 +1,22 @@
+//===----------- load_shared_lib-so.cc --------------------------*- C++ -*-===//
+//
+//                     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 ThreadSanitizer (TSan), a race detector.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stddef.h>
+
+int GLOB_SHARED = 0;
+
+extern "C"
+void *write_from_so(void *unused) {
+  GLOB_SHARED++;
+  return NULL;
+}