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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
//===- FuzzerValueBitMap.h - INTERNAL - Bit map -----------------*- 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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// ValueBitMap.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_FUZZER_VALUE_BIT_MAP_H
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#define LLVM_FUZZER_VALUE_BIT_MAP_H
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#include "FuzzerDefs.h"
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namespace fuzzer {
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// A bit map containing kMapSizeInWords bits.
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struct ValueBitMap {
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static const size_t kMapSizeInBits = 1 << 16;
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static const size_t kMapPrimeMod = 65371; // Largest Prime < kMapSizeInBits;
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static const size_t kBitsInWord = (sizeof(uintptr_t) * 8);
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static const size_t kMapSizeInWords = kMapSizeInBits / kBitsInWord;
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public:
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// Clears all bits.
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void Reset() { memset(Map, 0, sizeof(Map)); }
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// Computes a hash function of Value and sets the corresponding bit.
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// Returns true if the bit was changed from 0 to 1.
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ATTRIBUTE_NO_SANITIZE_ALL
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inline bool AddValue(uintptr_t Value) {
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uintptr_t Idx = Value % kMapSizeInBits;
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uintptr_t WordIdx = Idx / kBitsInWord;
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uintptr_t BitIdx = Idx % kBitsInWord;
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uintptr_t Old = Map[WordIdx];
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uintptr_t New = Old | (1UL << BitIdx);
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Map[WordIdx] = New;
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return New != Old;
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}
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ATTRIBUTE_NO_SANITIZE_ALL
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inline bool AddValueModPrime(uintptr_t Value) {
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return AddValue(Value % kMapPrimeMod);
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}
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inline bool Get(uintptr_t Idx) {
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assert(Idx < kMapSizeInBits);
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uintptr_t WordIdx = Idx / kBitsInWord;
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uintptr_t BitIdx = Idx % kBitsInWord;
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return Map[WordIdx] & (1UL << BitIdx);
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}
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size_t SizeInBits() const { return kMapSizeInBits; }
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template <class Callback>
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ATTRIBUTE_NO_SANITIZE_ALL
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void ForEach(Callback CB) const {
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for (size_t i = 0; i < kMapSizeInWords; i++)
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if (uintptr_t M = Map[i])
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for (size_t j = 0; j < sizeof(M) * 8; j++)
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if (M & ((uintptr_t)1 << j))
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CB(i * sizeof(M) * 8 + j);
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}
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private:
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ATTRIBUTE_ALIGNED(512) uintptr_t Map[kMapSizeInWords];
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};
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} // namespace fuzzer
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#endif // LLVM_FUZZER_VALUE_BIT_MAP_H
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