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. |
26 | void llvm::set_fixed_execution_hash_seed(uint64_t fixed_value) { |
27 | hashing::detail::fixed_seed_override = fixed_value; |
28 | } |
29 | |