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99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
//===- FuzzerCorpus.h - Internal header for the Fuzzer ----------*- C++ -* ===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// fuzzer::InputCorpus
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_FUZZER_CORPUS
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#define LLVM_FUZZER_CORPUS
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#include <random>
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#include <unordered_set>
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#include "FuzzerDefs.h"
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#include "FuzzerRandom.h"
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namespace fuzzer {
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struct InputInfo {
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Unit U; // The actual input data.
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uint8_t Sha1[kSHA1NumBytes]; // Checksum.
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// Stats.
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uintptr_t NumExecutedMutations = 0;
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uintptr_t NumSuccessfullMutations = 0;
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};
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class InputCorpus {
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public:
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InputCorpus() {
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Inputs.reserve(1 << 14); // Avoid too many resizes.
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}
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size_t size() const { return Inputs.size(); }
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bool empty() const { return Inputs.empty(); }
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const Unit &operator[] (size_t Idx) const { return Inputs[Idx].U; }
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void AddToCorpus(const Unit &U) {
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uint8_t Hash[kSHA1NumBytes];
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ComputeSHA1(U.data(), U.size(), Hash);
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if (!Hashes.insert(Sha1ToString(Hash)).second) return;
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Inputs.push_back(InputInfo());
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InputInfo &II = Inputs.back();
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II.U = U;
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memcpy(II.Sha1, Hash, kSHA1NumBytes);
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UpdateCorpusDistribution();
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}
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typedef const std::vector<InputInfo>::const_iterator ConstIter;
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ConstIter begin() const { return Inputs.begin(); }
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ConstIter end() const { return Inputs.end(); }
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bool HasUnit(const Unit &U) { return Hashes.count(Hash(U)); }
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InputInfo &ChooseUnitToMutate(Random &Rand) {
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return Inputs[ChooseUnitIdxToMutate(Rand)];
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};
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// Returns an index of random unit from the corpus to mutate.
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// Hypothesis: units added to the corpus last are more likely to be
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// interesting. This function gives more weight to the more recent units.
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size_t ChooseUnitIdxToMutate(Random &Rand) {
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size_t Idx = static_cast<size_t>(CorpusDistribution(Rand.Get_mt19937()));
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assert(Idx < Inputs.size());
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return Idx;
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}
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void PrintStats() {
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for (size_t i = 0; i < Inputs.size(); i++) {
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const auto &II = Inputs[i];
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Printf(" [%zd %s]\tsz: %zd\truns: %zd\tsucc: %zd\n", i,
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Sha1ToString(II.Sha1).c_str(), II.U.size(),
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II.NumExecutedMutations, II.NumSuccessfullMutations);
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}
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}
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private:
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// Updates the probability distribution for the units in the corpus.
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// Must be called whenever the corpus or unit weights are changed.
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void UpdateCorpusDistribution() {
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size_t N = Inputs.size();
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std::vector<double> Intervals(N + 1);
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std::vector<double> Weights(N);
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std::iota(Intervals.begin(), Intervals.end(), 0);
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std::iota(Weights.begin(), Weights.end(), 1);
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CorpusDistribution = std::piecewise_constant_distribution<double>(
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Intervals.begin(), Intervals.end(), Weights.begin());
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}
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std::piecewise_constant_distribution<double> CorpusDistribution;
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std::unordered_set<std::string> Hashes;
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std::vector<InputInfo> Inputs;
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};
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} // namespace fuzzer
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#endif // LLVM_FUZZER_CORPUS
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