[libFuzzer] initial implementation of -data_flow_trace. It parses the data flow trace and prints the summary, but doesn't use the information in any other way yet
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@334058 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerDataFlowTrace.cpp b/FuzzerDataFlowTrace.cpp
new file mode 100644
index 0000000..69efd6f
--- /dev/null
+++ b/FuzzerDataFlowTrace.cpp
@@ -0,0 +1,90 @@
+//===- FuzzerDataFlowTrace.cpp - DataFlowTrace ---*- C++ -* ===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::DataFlowTrace
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDataFlowTrace.h"
+#include "FuzzerIO.h"
+
+#include <cstdlib>
+#include <fstream>
+#include <string>
+#include <vector>
+
+namespace fuzzer {
+
+void DataFlowTrace::Init(const std::string &DirPath,
+ const std::string &FocusFunction) {
+ if (DirPath.empty()) return;
+ const char *kFunctionsTxt = "functions.txt";
+ Printf("INFO: DataFlowTrace: reading from '%s'\n", DirPath.c_str());
+ Vector<SizedFile> Files;
+ GetSizedFilesFromDir(DirPath, &Files);
+ std::string L;
+
+ // Read functions.txt
+ std::ifstream IF(DirPlusFile(DirPath, kFunctionsTxt));
+ size_t FocusFuncIdx = SIZE_MAX;
+ size_t NumFunctions = 0;
+ while (std::getline(IF, L, '\n')) {
+ NumFunctions++;
+ if (FocusFunction == L)
+ FocusFuncIdx = NumFunctions - 1;
+ }
+ if (!NumFunctions || FocusFuncIdx == SIZE_MAX || Files.size() <= 1)
+ return;
+ // Read traces.
+ size_t NumTraceFiles = 0;
+ size_t NumTracesWithFocusFunction = 0;
+ for (auto &SF : Files) {
+ auto Name = Basename(SF.File);
+ if (Name == kFunctionsTxt) continue;
+ auto ParseError = [&](const char *Err) {
+ Printf("DataFlowTrace: parse error: %s\n File: %s\n Line: %s\n", Err,
+ Name.c_str(), L.c_str());
+ };
+ NumTraceFiles++;
+ // Printf("=== %s\n", Name.c_str());
+ std::ifstream IF(SF.File);
+ while (std::getline(IF, L, '\n')) {
+ size_t SpacePos = L.find(' ');
+ if (SpacePos == std::string::npos)
+ return ParseError("no space in the trace line");
+ if (L.empty() || L[0] != 'F')
+ return ParseError("the trace line doesn't start with 'F'");
+ size_t N = std::atol(L.c_str() + 1);
+ if (N >= NumFunctions)
+ return ParseError("N is greater than the number of functions");
+ if (N == FocusFuncIdx) {
+ NumTracesWithFocusFunction++;
+ const char *Beg = L.c_str() + SpacePos + 1;
+ const char *End = L.c_str() + L.size();
+ assert(Beg < End);
+ size_t Len = End - Beg;
+ Vector<bool> V(Len);
+ for (size_t I = 0; I < Len; I++) {
+ if (Beg[I] != '0' && Beg[I] != '1')
+ ParseError("the trace should contain only 0 or 1");
+ V[I] = Beg[I] == '1';
+ }
+ // Print just a few small traces.
+ if (NumTracesWithFocusFunction <= 3 && Len <= 16)
+ Printf("%s => |%s|\n", Name.c_str(), L.c_str() + SpacePos + 1);
+ break; // No need to parse the following lines.
+ }
+ }
+ }
+ assert(NumTraceFiles == Files.size() - 1);
+ Printf("INFO: DataFlowTrace: %zd trace files, %zd functions, "
+ "%zd traces with focus function\n",
+ NumTraceFiles, NumFunctions, NumTracesWithFocusFunction);
+}
+
+} // namespace fuzzer
+