1 files changed, 33 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_win_weak_interception.h b/lib/sanitizer_common/sanitizer_win_weak_interception.h
new file mode 100644
index 000000000000..5b122971d2d0
--- /dev/null
+++ b/lib/sanitizer_common/sanitizer_win_weak_interception.h
@@ -0,0 +1,33 @@
+//===-- sanitizer_win_weak_interception.h ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// This header provide helper macros to delegate calls of weak functions to the
+// implementation in the main executable when a strong definition is present.
+//===----------------------------------------------------------------------===//
+#ifndef SANITIZER_WIN_WEAK_INTERCEPTION_H
+#define SANITIZER_WIN_WEAK_INTERCEPTION_H
+#include "sanitizer_internal_defs.h"
+
+namespace __sanitizer {
+int interceptWhenPossible(uptr dll_function, const char *real_function);
+}
+
+// ----------------- Function interception helper macros -------------------- //
+// Weak functions, could be redefined in the main executable, but that is not
+// necessary, so we shouldn't die if we can not find a reference.
+#define INTERCEPT_WEAK(Name) interceptWhenPossible((uptr) Name, #Name);
+
+#define INTERCEPT_SANITIZER_WEAK_FUNCTION(Name)                                \
+  static int intercept_##Name() {                                              \
+    return __sanitizer::interceptWhenPossible((__sanitizer::uptr) Name, #Name);\
+  }                                                                            \
+  __pragma(section(".WEAK$M", long, read))                                     \
+  __declspec(allocate(".WEAK$M")) int (*__weak_intercept_##Name)() =           \
+      intercept_##Name;
+
+#endif // SANITIZER_WIN_WEAK_INTERCEPTION_H