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-The AddressSanitizer (http://code.google.com/p/address-sanitizer) is
-a project developed by Google Inc. The source files of the project
-are hosted at http://llvm.org/svn/llvm-project/compiler-rt. These files
-are the ones in the asan subdirectory of that project.
+AddressSanitizer (http://code.google.com/p/address-sanitizer) and
+ThreadSanitizer (http://code.google.com/p/thread-sanitizer/) are
+projects initially developed by Google Inc.
+Both tools consist of a compiler module and a run-time library.
+The sources of the run-time library for these projects are hosted at
+http://llvm.org/svn/llvm-project/compiler-rt in the following directories:
+ include/sanitizer
+ lib/sanitizer_common
+ lib/interception
+ lib/asan
+ lib/tsan
+
+Trivial and urgent fixes (portability, build fixes, etc.) may go directly to the
+GCC tree. All non-trivial changes, functionality improvements, etc. should go
+through the upstream tree first and then be merged back to the GCC tree.