[asan] on linux, run __asan_init from .preinit_array (even earlier than before)

llvm-svn: 175623

1 files changed, 27 insertions, 0 deletions

diff --git a/compiler-rt/lib/asan/lit_tests/preinit_test.cc b/compiler-rt/lib/asan/lit_tests/preinit_test.cc
new file mode 100644
index 00000000000..28e509472c0
--- /dev/null
+++ b/compiler-rt/lib/asan/lit_tests/preinit_test.cc
@@ -0,0 +1,27 @@
+// RUN: %clangxx      -DFUNC=zzzz %s -shared -o %t.so -fPIC
+// RUN: %clangxx_asan -DFUNC=main %s         -o %t    -Wl,-R. %t.so
+// RUN: %t
+
+// This test ensures that we call __asan_init early enough.
+// We build a shared library w/o asan instrumentation
+// and the binary with asan instrumentation.
+// Both files include the same header (emulated by -DFUNC here)
+// with C++ template magic which runs global initializer at library load time.
+// The function get() is instrumented with asan, but called
+// before the usual constructors are run.
+// So, we must make sure that __asan_init is executed even earlier.
+//
+// See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56393
+
+struct A {
+  int foo() const { return 0; }
+};
+A get () { return A(); }
+template <class> struct O {
+  static A const e;
+};
+template <class T> A const O <T>::e = get();
+int FUNC() {
+  return O<int>::e.foo();
+}
+