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

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