summaryrefslogtreecommitdiff
path: root/lib/Fuzzer/FuzzerValueBitMap.h
diff options
context:
space:
mode:
Diffstat (limited to 'lib/Fuzzer/FuzzerValueBitMap.h')
-rw-r--r--lib/Fuzzer/FuzzerValueBitMap.h94
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