1 //===-------------- lib/Support/Hashing.cpp -------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file provides implementation bits for the LLVM common hashing
10 // infrastructure. Documentation and most of the other information is in the
11 // header file.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "llvm/ADT/Hashing.h"
16
17 using namespace llvm;
18
19 // Provide a definition and static initializer for the fixed seed. This
20 // initializer should always be zero to ensure its value can never appear to be
21 // non-zero, even during dynamic initialization.
22 uint64_t llvm::hashing::detail::fixed_seed_override = 0;
23
24 // Implement the function for forced setting of the fixed seed.
25 // FIXME: Use atomic operations here so that there is no data race.
set_fixed_execution_hash_seed(uint64_t fixed_value)26 void llvm::set_fixed_execution_hash_seed(uint64_t fixed_value) {
27 hashing::detail::fixed_seed_override = fixed_value;
28 }
29