1 files changed, 28 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Support/Hashing.cpp b/contrib/llvm-project/llvm/lib/Support/Hashing.cpp
new file mode 100644
index 000000000000..1b20a670434f
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Support/Hashing.cpp
@@ -0,0 +1,28 @@
+//===-------------- lib/Support/Hashing.cpp -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides implementation bits for the LLVM common hashing
+// infrastructure. Documentation and most of the other information is in the
+// header file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/Hashing.h"
+
+using namespace llvm;
+
+// Provide a definition and static initializer for the fixed seed. This
+// initializer should always be zero to ensure its value can never appear to be
+// non-zero, even during dynamic initialization.
+uint64_t llvm::hashing::detail::fixed_seed_override = 0;
+
+// Implement the function for forced setting of the fixed seed.
+// FIXME: Use atomic operations here so that there is no data race.
+void llvm::set_fixed_execution_hash_seed(uint64_t fixed_value) {
+  hashing::detail::fixed_seed_override = fixed_value;
+}