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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
//===- FuzzerDataFlowTrace.cpp - DataFlowTrace ---*- C++ -* ===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// fuzzer::DataFlowTrace
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//===----------------------------------------------------------------------===//
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#include "FuzzerDataFlowTrace.h"
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#include "FuzzerIO.h"
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#include <cstdlib>
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#include <fstream>
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#include <string>
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#include <vector>
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namespace fuzzer {
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void DataFlowTrace::Init(const std::string &DirPath,
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const std::string &FocusFunction) {
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if (DirPath.empty()) return;
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const char *kFunctionsTxt = "functions.txt";
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Printf("INFO: DataFlowTrace: reading from '%s'\n", DirPath.c_str());
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Vector<SizedFile> Files;
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GetSizedFilesFromDir(DirPath, &Files);
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std::string L;
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// Read functions.txt
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std::ifstream IF(DirPlusFile(DirPath, kFunctionsTxt));
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size_t FocusFuncIdx = SIZE_MAX;
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size_t NumFunctions = 0;
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while (std::getline(IF, L, '\n')) {
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NumFunctions++;
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if (FocusFunction == L)
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FocusFuncIdx = NumFunctions - 1;
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}
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if (!NumFunctions || FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
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return;
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// Read traces.
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size_t NumTraceFiles = 0;
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size_t NumTracesWithFocusFunction = 0;
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for (auto &SF : Files) {
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auto Name = Basename(SF.File);
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if (Name == kFunctionsTxt) continue;
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auto ParseError = [&](const char *Err) {
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Printf("DataFlowTrace: parse error: %s\n File: %s\n Line: %s\n", Err,
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Name.c_str(), L.c_str());
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};
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NumTraceFiles++;
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// Printf("=== %s\n", Name.c_str());
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std::ifstream IF(SF.File);
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while (std::getline(IF, L, '\n')) {
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size_t SpacePos = L.find(' ');
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if (SpacePos == std::string::npos)
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return ParseError("no space in the trace line");
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if (L.empty() || L[0] != 'F')
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return ParseError("the trace line doesn't start with 'F'");
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size_t N = std::atol(L.c_str() + 1);
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if (N >= NumFunctions)
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return ParseError("N is greater than the number of functions");
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if (N == FocusFuncIdx) {
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NumTracesWithFocusFunction++;
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const char *Beg = L.c_str() + SpacePos + 1;
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const char *End = L.c_str() + L.size();
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assert(Beg < End);
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size_t Len = End - Beg;
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Vector<uint8_t> V(Len);
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for (size_t I = 0; I < Len; I++) {
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if (Beg[I] != '0' && Beg[I] != '1')
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ParseError("the trace should contain only 0 or 1");
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V[I] = Beg[I] == '1';
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}
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Traces[Name] = V;
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// Print just a few small traces.
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if (NumTracesWithFocusFunction <= 3 && Len <= 16)
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Printf("%s => |%s|\n", Name.c_str(), L.c_str() + SpacePos + 1);
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break; // No need to parse the following lines.
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}
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}
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}
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assert(NumTraceFiles == Files.size() - 1);
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Printf("INFO: DataFlowTrace: %zd trace files, %zd functions, "
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"%zd traces with focus function\n",
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NumTraceFiles, NumFunctions, NumTracesWithFocusFunction);
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}
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} // namespace fuzzer
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