1//===- FuzzerValueBitMap.h - INTERNAL - Bit map -----------------*- C++ -* ===//
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// ValueBitMap.
9//===----------------------------------------------------------------------===//
10
11#ifndef LLVM_FUZZER_VALUE_BIT_MAP_H
12#define LLVM_FUZZER_VALUE_BIT_MAP_H
13
14#include "FuzzerDefs.h"

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29 // Computes a hash function of Value and sets the corresponding bit.
30 // Returns true if the bit was changed from 0 to 1.
31 ATTRIBUTE_NO_SANITIZE_ALL
32 inline bool AddValue(uintptr_t Value) {
33 uintptr_t Idx = Value % kMapSizeInBits;
34 uintptr_t WordIdx = Idx / kBitsInWord;
35 uintptr_t BitIdx = Idx % kBitsInWord;
36 uintptr_t Old = Map[WordIdx];
37 uintptr_t New = Old | (1ULL << BitIdx);
38 Map[WordIdx] = New;
39 return New != Old;
40 }
41
42 ATTRIBUTE_NO_SANITIZE_ALL
43 inline bool AddValueModPrime(uintptr_t Value) {
44 return AddValue(Value % kMapPrimeMod);
45 }
46
47 inline bool Get(uintptr_t Idx) {
48 assert(Idx < kMapSizeInBits);
49 uintptr_t WordIdx = Idx / kBitsInWord;
50 uintptr_t BitIdx = Idx % kBitsInWord;
51 return Map[WordIdx] & (1ULL << BitIdx);
52 }
53
54 size_t SizeInBits() const { return kMapSizeInBits; }
55
56 template <class Callback>
57 ATTRIBUTE_NO_SANITIZE_ALL
58 void ForEach(Callback CB) const {
59 for (size_t i = 0; i < kMapSizeInWords; i++)
60 if (uintptr_t M = Map[i])
61 for (size_t j = 0; j < sizeof(M) * 8; j++)
62 if (M & ((uintptr_t)1 << j))
63 CB(i * sizeof(M) * 8 + j);
64 }
65
66 private:
67 ATTRIBUTE_ALIGNED(512) uintptr_t Map[kMapSizeInWords];
68};
69
70} // namespace fuzzer
71
72#endif // LLVM_FUZZER_VALUE_BIT_MAP_H