1*0b57cec5SDimitry Andric //===-------------- lib/Support/Hashing.cpp -------------------------------===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file provides implementation bits for the LLVM common hashing 10*0b57cec5SDimitry Andric // infrastructure. Documentation and most of the other information is in the 11*0b57cec5SDimitry Andric // header file. 12*0b57cec5SDimitry Andric // 13*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric #include "llvm/ADT/Hashing.h" 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric using namespace llvm; 18*0b57cec5SDimitry Andric 19*0b57cec5SDimitry Andric // Provide a definition and static initializer for the fixed seed. This 20*0b57cec5SDimitry Andric // initializer should always be zero to ensure its value can never appear to be 21*0b57cec5SDimitry Andric // non-zero, even during dynamic initialization. 22*0b57cec5SDimitry Andric uint64_t llvm::hashing::detail::fixed_seed_override = 0; 23*0b57cec5SDimitry Andric 24*0b57cec5SDimitry Andric // Implement the function for forced setting of the fixed seed. 25*0b57cec5SDimitry Andric // FIXME: Use atomic operations here so that there is no data race. set_fixed_execution_hash_seed(uint64_t fixed_value)26*0b57cec5SDimitry Andricvoid llvm::set_fixed_execution_hash_seed(uint64_t fixed_value) { 27*0b57cec5SDimitry Andric hashing::detail::fixed_seed_override = fixed_value; 28*0b57cec5SDimitry Andric } 29