diff options
Diffstat (limited to 'lib/Fuzzer/FuzzerValueBitMap.h')
| -rw-r--r-- | lib/Fuzzer/FuzzerValueBitMap.h | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/lib/Fuzzer/FuzzerValueBitMap.h b/lib/Fuzzer/FuzzerValueBitMap.h deleted file mode 100644 index 8f7ff74300f4..000000000000 --- a/lib/Fuzzer/FuzzerValueBitMap.h +++ /dev/null @@ -1,94 +0,0 @@ -//===- FuzzerValueBitMap.h - INTERNAL - Bit map -----------------*- C++ -* ===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// ValueBitMap. -//===----------------------------------------------------------------------===// - -#ifndef LLVM_FUZZER_VALUE_BIT_MAP_H -#define LLVM_FUZZER_VALUE_BIT_MAP_H - -#include "FuzzerDefs.h" - -namespace fuzzer { - -// A bit map containing kMapSizeInWords bits. -struct ValueBitMap { - static const size_t kMapSizeInBits = 1 << 16; - static const size_t kMapPrimeMod = 65371; // Largest Prime < kMapSizeInBits; - static const size_t kBitsInWord = (sizeof(uintptr_t) * 8); - static const size_t kMapSizeInWords = kMapSizeInBits / kBitsInWord; - public: - - // Clears all bits. - void Reset() { memset(Map, 0, sizeof(Map)); } - - // Computes a hash function of Value and sets the corresponding bit. - // Returns true if the bit was changed from 0 to 1. - ATTRIBUTE_NO_SANITIZE_ALL - inline bool AddValue(uintptr_t Value) { - uintptr_t Idx = Value % kMapSizeInBits; - uintptr_t WordIdx = Idx / kBitsInWord; - uintptr_t BitIdx = Idx % kBitsInWord; - uintptr_t Old = Map[WordIdx]; - uintptr_t New = Old | (1UL << BitIdx); - Map[WordIdx] = New; - return New != Old; - } - - ATTRIBUTE_NO_SANITIZE_ALL - inline bool AddValueModPrime(uintptr_t Value) { - return AddValue(Value % kMapPrimeMod); - } - - inline bool Get(uintptr_t Idx) { - assert(Idx < kMapSizeInBits); - uintptr_t WordIdx = Idx / kBitsInWord; - uintptr_t BitIdx = Idx % kBitsInWord; - return Map[WordIdx] & (1UL << BitIdx); - } - - size_t GetNumBitsSinceLastMerge() const { return NumBits; } - - // Merges 'Other' into 'this', clears 'Other', updates NumBits, - // returns true if new bits were added. - ATTRIBUTE_TARGET_POPCNT - bool MergeFrom(ValueBitMap &Other) { - uintptr_t Res = 0; - size_t OldNumBits = NumBits; - for (size_t i = 0; i < kMapSizeInWords; i++) { - auto O = Other.Map[i]; - auto M = Map[i]; - if (O) { - Map[i] = (M |= O); - Other.Map[i] = 0; - } - if (M) - Res += __builtin_popcountll(M); - } - NumBits = Res; - return OldNumBits < NumBits; - } - - template <class Callback> - ATTRIBUTE_NO_SANITIZE_ALL - void ForEach(Callback CB) const { - for (size_t i = 0; i < kMapSizeInWords; i++) - if (uintptr_t M = Map[i]) - for (size_t j = 0; j < sizeof(M) * 8; j++) - if (M & ((uintptr_t)1 << j)) - CB(i * sizeof(M) * 8 + j); - } - - private: - size_t NumBits = 0; - uintptr_t Map[kMapSizeInWords] __attribute__((aligned(512))); -}; - -} // namespace fuzzer - -#endif // LLVM_FUZZER_VALUE_BIT_MAP_H |
