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diff --git a/deps/v8/src/sanitizer/tsan.h b/deps/v8/src/sanitizer/tsan.h
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+++ b/deps/v8/src/sanitizer/tsan.h
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+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_SANITIZER_TSAN_H_
+#define V8_SANITIZER_TSAN_H_
+
+namespace v8 {
+namespace base {
+
+// This file contains annotations for ThreadSanitizer (TSan), a race detector.
+// See
+// https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/tsan/rtl/tsan_interface_ann.cc
+
+#if THREAD_SANITIZER
+
+#define TSAN_ANNOTATE_IGNORE_READS_BEGIN \
+  v8::base::AnnotateIgnoreReadsBegin(__FILE__, __LINE__)
+#define TSAN_ANNOTATE_IGNORE_READS_END \
+  v8::base::AnnotateIgnoreReadsEnd(__FILE__, __LINE__)
+#define TSAN_ANNOTATE_IGNORE_WRITES_BEGIN \
+  v8::base::AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
+#define TSAN_ANNOTATE_IGNORE_WRITES_END \
+  v8::base::AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
+
+extern "C" {
+
+void AnnotateIgnoreReadsBegin(const char* file, int line);
+void AnnotateIgnoreReadsEnd(const char* file, int line);
+void AnnotateIgnoreWritesBegin(const char* file, int line);
+void AnnotateIgnoreWritesEnd(const char* file, int line);
+
+}  // extern "C"
+
+#else
+
+#define TSAN_ANNOTATE_IGNORE_READS_BEGIN ((void)0)
+#define TSAN_ANNOTATE_IGNORE_READS_END ((void)0)
+#define TSAN_ANNOTATE_IGNORE_WRITES_BEGIN ((void)0)
+#define TSAN_ANNOTATE_IGNORE_WRITES_END ((void)0)
+
+#endif
+
+}  // namespace base
+}  // namespace v8
+
+#endif  // V8_SANITIZER_TSAN_H_