blob: c14dd589e62dd214cea7605664ae9ace63767764 [file] [log] [blame]
//===- FuzzerMerge.h - merging corpa ----------------------------*- C++ -* ===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Merging Corpora.
// The task:
// Take the existing corpus (possibly empty) and merge new inputs into
// it so that only inputs with new coverage ('features') are added.
// The process should tolerate the crashes, OOMs, leaks, etc.
// Algorithm:
// The outter process collects the set of files and writes their names
// into a temporary "control" file, then repeatedly launches the inner
// process until all inputs are processed.
// The outer process does not actually execute the target code.
// The inner process reads the control file and sees a) list of all the inputs
// and b) the last processed input. Then it starts processing the inputs one
// by one. Before processing every input it writes one line to control file:
// After processing an input it write another line:
// DONE INPUT_ID Feature1 Feature2 Feature3 ...
// If a crash happens while processing an input the last line in the control
// file will be "STARTED INPUT_ID" and so the next process will know
// where to resume.
// Once all inputs are processed by the innner process(es) the outer process
// reads the control files and does the merge based entirely on the contents
// of control file.
// It uses a single pass greedy algorithm choosing first the smallest inputs
// within the same size the inputs that have more new features.
#include "FuzzerDefs.h"
#include <istream>
#include <ostream>
#include <set>
#include <vector>
namespace fuzzer {
struct MergeFileInfo {
std::string Name;
size_t Size = 0;
Vector<uint32_t> Features, Cov;
struct Merger {
Vector<MergeFileInfo> Files;
size_t NumFilesInFirstCorpus = 0;
size_t FirstNotProcessedFile = 0;
std::string LastFailure;
bool Parse(std::istream &IS, bool ParseCoverage);
bool Parse(const std::string &Str, bool ParseCoverage);
void ParseOrExit(std::istream &IS, bool ParseCoverage);
size_t Merge(const Set<uint32_t> &InitialFeatures, Set<uint32_t> *NewFeatures,
const Set<uint32_t> &InitialCov, Set<uint32_t> *NewCov,
Vector<std::string> *NewFiles);
size_t ApproximateMemoryConsumption() const;
Set<uint32_t> AllFeatures() const;
void CrashResistantMerge(const Vector<std::string> &Args,
const Vector<SizedFile> &OldCorpus,
const Vector<SizedFile> &NewCorpus,
Vector<std::string> *NewFiles,
const Set<uint32_t> &InitialFeatures,
Set<uint32_t> *NewFeatures,
const Set<uint32_t> &InitialCov,
Set<uint32_t> *NewCov,
const std::string &CFPath,
bool Verbose);
} // namespace fuzzer