1 //===- FuzzerTracePC.h - INTERNAL - Path tracer. --------*- 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 // Trace PCs. 10 // This module implements __sanitizer_cov_trace_pc, a callback required 11 // for -fsanitize-coverage=trace-pc instrumentation. 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_FUZZER_TRACE_PC_H 15 #define LLVM_FUZZER_TRACE_PC_H 16 17 namespace fuzzer { 18 struct PcCoverageMap { 19 static const size_t kMapSizeInBits = 65371; // Prime. 20 static const size_t kMapSizeInBitsAligned = 65536; // 2^16 21 static const size_t kBitsInWord = (sizeof(uintptr_t) * 8); 22 static const size_t kMapSizeInWords = kMapSizeInBitsAligned / kBitsInWord; 23 24 void Reset(); 25 inline void Update(uintptr_t Addr); 26 size_t MergeFrom(const PcCoverageMap &Other); 27 28 uintptr_t Map[kMapSizeInWords] __attribute__((aligned(512))); 29 }; 30 31 // Clears the current PC Map. 32 void PcMapResetCurrent(); 33 // Merges the current PC Map into the combined one, and clears the former. 34 size_t PcMapMergeInto(PcCoverageMap *Map); 35 } 36 37 #endif 38
