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// -*- C++ -*-
//===------------------------- fuzzing.cpp -------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// A set of routines to use when fuzzing the algorithms in libc++
// Each one tests a single algorithm.
//
// They all have the form of:
// int `algorithm`(const uint8_t *data, size_t size);
//
// They perform the operation, and then check to see if the results are correct.
// If so, they return zero, and non-zero otherwise.
//
// For example, sort calls std::sort, then checks two things:
// (1) The resulting vector is sorted
// (2) The resulting vector contains the same elements as the original data.
#include "fuzzing.h"
#include <vector>
#include <algorithm>
#include <iostream>
// If we had C++14, we could use the four iterator version of is_permutation
namespace fuzzing {
// This is a struct we can use to test the stable_XXX algorithms.
// perform the operation on the key, then check the order of the payload.
struct stable_test {
uint8_t key;
uint8_t payload;
stable_test(uint8_t k) : key(k), payload(0) {}
stable_test(uint8_t k, uint8_t p) : key(k), payload(p) {}
};
void swap(stable_test &lhs, stable_test &rhs)
{
using std::swap;
swap(lhs.key, rhs.key);
swap(lhs.payload, rhs.payload);
}
struct key_less
{
bool operator () (const stable_test &lhs, const stable_test &rhs) const
{
return lhs.key < rhs.key;
}
};
struct payload_less
{
bool operator () (const stable_test &lhs, const stable_test &rhs) const
{
return lhs.payload < rhs.payload;
}
};
struct total_less
{
bool operator () (const stable_test &lhs, const stable_test &rhs) const
{
return lhs.key == rhs.key ? lhs.payload < rhs.payload : lhs.key < rhs.key;
}
};
bool operator==(const stable_test &lhs, const stable_test &rhs)
{
return lhs.key == rhs.key && lhs.payload == rhs.payload;
}
template<typename T>
struct is_even
{
bool operator () (const T &t) const
{
return t % 2 == 0;
}
};
template<>
struct is_even<stable_test>
{
bool operator () (const stable_test &t) const
{
return t.key % 2 == 0;
}
};
// == sort ==
int sort(const uint8_t *data, size_t size)
{
std::vector<uint8_t> working(data, data + size);
std::sort(working.begin(), working.end());
if (!std::is_sorted(working.begin(), working.end())) return 1;
if (!std::is_permutation(data, data + size, working.begin())) return 99;
return 0;
}
// == stable_sort ==
int stable_sort(const uint8_t *data, size_t size)
{
std::vector<stable_test> input;
for (size_t i = 0; i < size; ++i)
input.push_back(stable_test(data[i], i));
std::vector<stable_test> working = input;
std::stable_sort(working.begin(), working.end(), key_less());
if (!std::is_sorted(working.begin(), working.end(), key_less())) return 1;
auto iter = working.begin();
while (iter != working.end())
{
auto range = std::equal_range(iter, working.end(), *iter, key_less());
if (!std::is_sorted(range.first, range.second, total_less())) return 2;
iter = range.second;
}
if (!std::is_permutation(input.begin(), input.end(), working.begin())) return 99;
return 0;
}
// == partition ==
int partition(const uint8_t *data, size_t size)
{
std::vector<uint8_t> working(data, data + size);
auto iter = std::partition(working.begin(), working.end(), is_even<uint8_t>());
if (!std::all_of (working.begin(), iter, is_even<uint8_t>())) return 1;
if (!std::none_of(iter, working.end(), is_even<uint8_t>())) return 2;
if (!std::is_permutation(data, data + size, working.begin())) return 99;
return 0;
}
// == stable_partition ==
int stable_partition (const uint8_t *data, size_t size)
{
std::vector<stable_test> input;
for (size_t i = 0; i < size; ++i)
input.push_back(stable_test(data[i], i));
std::vector<stable_test> working = input;
auto iter = std::stable_partition(working.begin(), working.end(), is_even<stable_test>());
if (!std::all_of (working.begin(), iter, is_even<stable_test>())) return 1;
if (!std::none_of(iter, working.end(), is_even<stable_test>())) return 2;
if (!std::is_sorted(working.begin(), iter, payload_less())) return 3;
if (!std::is_sorted(iter, working.end(), payload_less())) return 4;
if (!std::is_permutation(input.begin(), input.end(), working.begin())) return 99;
return 0;
}
// == nth_element ==
// use the first element as a position into the data
int nth_element (const uint8_t *data, size_t size)
{
if (size <= 1) return 0;
const size_t partition_point = data[0] % size;
std::vector<uint8_t> working(data + 1, data + size);
const auto partition_iter = working.begin() + partition_point;
std::nth_element(working.begin(), partition_iter, working.end());
// nth may be the end iterator, in this case nth_element has no effect.
if (partition_iter == working.end())
{
if (!std::equal(data + 1, data + size, working.begin())) return 98;
}
else
{
const uint8_t nth = *partition_iter;
if (!std::all_of(working.begin(), partition_iter, [=](uint8_t v) { return v <= nth; }))
return 1;
if (!std::all_of(partition_iter, working.end(), [=](uint8_t v) { return v >= nth; }))
return 2;
if (!std::is_permutation(data + 1, data + size, working.begin())) return 99;
}
return 0;
}
// == partial_sort ==
// use the first element as a position into the data
int partial_sort (const uint8_t *data, size_t size)
{
if (size <= 1) return 0;
const size_t sort_point = data[0] % size;
std::vector<uint8_t> working(data + 1, data + size);
const auto sort_iter = working.begin() + sort_point;
std::partial_sort(working.begin(), sort_iter, working.end());
if (sort_iter != working.end())
{
const uint8_t nth = *std::min_element(sort_iter, working.end());
if (!std::all_of(working.begin(), sort_iter, [=](uint8_t v) { return v <= nth; }))
return 1;
if (!std::all_of(sort_iter, working.end(), [=](uint8_t v) { return v >= nth; }))
return 2;
}
if (!std::is_sorted(working.begin(), sort_iter)) return 3;
if (!std::is_permutation(data + 1, data + size, working.begin())) return 99;
return 0;
}
} // namespace fuzzing
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