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diff --git a/lib/Transforms/Instrumentation/FunctionBlackList.h b/lib/Transforms/Instrumentation/FunctionBlackList.h
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+++ b/lib/Transforms/Instrumentation/FunctionBlackList.h
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+//===-- FunctionBlackList.cpp - blacklist of functions ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//===----------------------------------------------------------------------===//
+//
+// This is a utility class for instrumentation passes (like AddressSanitizer
+// or ThreadSanitizer) to avoid instrumenting some functions based on
+// user-supplied blacklist.
+//
+//===----------------------------------------------------------------------===//
+//
+
+#include <string>
+
+namespace llvm {
+class Function;
+class Regex;
+
+// Blacklisted functions are not instrumented.
+// The blacklist file contains one or more lines like this:
+// ---
+// fun:FunctionWildCard
+// ---
+// This is similar to the "ignore" feature of ThreadSanitizer.
+// http://code.google.com/p/data-race-test/wiki/ThreadSanitizerIgnores
+class FunctionBlackList {
+ public:
+  FunctionBlackList(const std::string &Path);
+  bool isIn(const Function &F);
+ private:
+  Regex *Functions;
+};
+
+}  // namespace llvm