b157dcacb5
Summary: Adds thread ID to PRNG seed for increased entropy. In particular, this allows multiple runs in quick succession that will have different PRNG seeds, allowing for better demos/testing. Reviewers: kcc Reviewed By: kcc Subscribers: kubamracek, #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D64453 llvm-svn: 366253
24 lines
770 B
C++
24 lines
770 B
C++
//===-- random.cpp ----------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "gwp_asan/random.h"
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#include "gwp_asan/guarded_pool_allocator.h"
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#include <time.h>
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namespace gwp_asan {
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uint32_t getRandomUnsigned32() {
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thread_local uint32_t RandomState =
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time(nullptr) + GuardedPoolAllocator::getThreadID();
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RandomState ^= RandomState << 13;
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RandomState ^= RandomState >> 17;
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RandomState ^= RandomState << 5;
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return RandomState;
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}
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} // namespace gwp_asan
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