Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 29 insertions, 0 deletions

diff --git a/gcc-4.9/libsanitizer/asan/asan_preinit.cc b/gcc-4.9/libsanitizer/asan/asan_preinit.cc
new file mode 100644
index 000000000..310424015
--- /dev/null
+++ b/gcc-4.9/libsanitizer/asan/asan_preinit.cc
@@ -0,0 +1,29 @@
+//===-- asan_preinit.cc ---------------------------------------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Call __asan_init at the very early stage of process startup.
+// On Linux we use .preinit_array section (unless PIC macro is defined).
+//===----------------------------------------------------------------------===//
+#include "asan_internal.h"
+
+#if ASAN_USE_PREINIT_ARRAY && !defined(PIC)
+  // On Linux, we force __asan_init to be called before anyone else
+  // by placing it into .preinit_array section.
+  // FIXME: do we have anything like this on Mac?
+  // The symbol is called __local_asan_preinit, because it's not intended to be
+  // exported.
+  __attribute__((section(".preinit_array"), used))
+  void (*__local_asan_preinit)(void) = __asan_init;
+#elif SANITIZER_WINDOWS && defined(_DLL)
+  // On Windows, when using dynamic CRT (/MD), we can put a pointer
+  // to __asan_init into the global list of C initializers.
+  // See crt0dat.c in the CRT sources for the details.
+  #pragma section(".CRT$XIB", long, read)  // NOLINT
+  __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init;
+#endif