vendor/compiler-rt/compiler-rt-r182741

1 files changed, 44 insertions, 0 deletions

diff --git a/lib/tsan/lit_tests/load_shared_lib.cc b/lib/tsan/lit_tests/load_shared_lib.cc
new file mode 100644
index 0000000000000..dd6fa0964f4af
--- /dev/null
+++ b/lib/tsan/lit_tests/load_shared_lib.cc
@@ -0,0 +1,44 @@
+// Check that if the list of shared libraries changes between the two race
+// reports, the second report occurring in a new shared library is still
+// symbolized correctly.
+
+// RUN: %clangxx_tsan -O1 %p/SharedLibs/load_shared_lib-so.cc \
+// RUN:     -fPIC -shared -o %t-so.so
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+
+#include <dlfcn.h>
+#include <pthread.h>
+#include <stdio.h>
+
+#include <string>
+
+int GLOB = 0;
+
+void *write_glob(void *unused) {
+  GLOB++;
+  return NULL;
+}
+
+void race_two_threads(void *(*access_callback)(void *unused)) {
+  pthread_t t1, t2;
+  pthread_create(&t1, NULL, access_callback, NULL);
+  pthread_create(&t2, NULL, access_callback, NULL);
+  pthread_join(t1, NULL);
+  pthread_join(t2, NULL);
+}
+
+int main(int argc, char *argv[]) {
+  std::string path = std::string(argv[0]) + std::string("-so.so");
+  race_two_threads(write_glob);
+  // CHECK: write_glob
+  void *lib = dlopen(path.c_str(), RTLD_NOW);
+    if (!lib) {
+    printf("error in dlopen(): %s\n", dlerror());
+    return 1;
+  }
+  void *(*write_from_so)(void *unused);
+  *(void **)&write_from_so = dlsym(lib, "write_from_so");
+  race_two_threads(write_from_so);
+  // CHECK: write_from_so
+  return 0;
+}