Hashing.cpp revision 53930f6d0870b65553f663a2094ca39c3f4bdc98
1//===-------------- lib/Support/Hashing.cpp -------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file provides implementation bits for the LLVM common hashing
11// infrastructure. Documentation and most of the other information is in the
12// header file.
13//
14//===----------------------------------------------------------------------===//
15
16#include "llvm/ADT/Hashing.h"
17
18using namespace llvm;
19
20// Provide a definition and static initializer for the fixed seed. This
21// initializer should always be zero to ensure its value can never appear to be
22// non-zero, even during dynamic initialization.
23size_t llvm::hashing::detail::fixed_seed_override = 0;
24
25// Implement the function for forced setting of the fixed seed.
26// FIXME: Use atomic operations here so that there is no data race.
27void llvm::set_fixed_execution_hash_seed(size_t fixed_value) {
28  hashing::detail::fixed_seed_override = fixed_value;
29}
30