about summary refs log tree commit diff
path: root/extra/fuzzer/flex-vector.cpp
blob: 14395de1d5ae92fb026f2a20ca56e9a41f0d3f03 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
//
// immer: immutable data structures for C++
// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
//
// This software is distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
//

#include "fuzzer_input.hpp"

#include <immer/box.hpp>
#include <immer/flex_vector.hpp>

#include <array>

extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t* data,
                                      std::size_t size)
{
    constexpr auto var_count = 8;
    constexpr auto bits      = 2;

    using vector_t =
        immer::flex_vector<int, immer::default_memory_policy, bits, bits>;
    using size_t = std::uint8_t;

    auto vars = std::array<vector_t, var_count>{};

    auto is_valid_var = [&](auto idx) { return idx >= 0 && idx < var_count; };
    auto is_valid_var_neq = [](auto other) {
        return [=](auto idx) {
            return idx >= 0 && idx < var_count && idx != other;
        };
    };
    auto is_valid_index = [](auto& v) {
        return [&](auto idx) { return idx >= 0 && idx < v.size(); };
    };
    auto is_valid_size = [](auto& v) {
        return [&](auto idx) { return idx >= 0 && idx <= v.size(); };
    };
    auto can_concat = [](auto&& v1, auto&& v2) {
        using size_type = decltype(v1.size());
        auto max        = std::numeric_limits<size_type>::max() >> (bits * 4);
        return v1.size() < max && v2.size() < max;
    };
    return fuzzer_input{data, size}.run([&](auto& in) {
        enum ops
        {
            op_push_back,
            op_update,
            op_take,
            op_drop,
            op_concat,
            op_push_back_move,
            op_update_move,
            op_take_move,
            op_drop_move,
            op_concat_move_l,
            op_concat_move_r,
            op_concat_move_lr,
            op_insert,
            op_erase,
            op_compare,
        };
        auto src = read<char>(in, is_valid_var);
        auto dst = read<char>(in, is_valid_var);
        switch (read<char>(in)) {
        case op_push_back: {
            vars[dst] = vars[src].push_back(42);
            break;
        }
        case op_update: {
            auto idx  = read<size_t>(in, is_valid_index(vars[src]));
            vars[dst] = vars[src].update(idx, [](auto x) { return x + 1; });
            break;
        }
        case op_take: {
            auto idx  = read<size_t>(in, is_valid_size(vars[src]));
            vars[dst] = vars[src].take(idx);
            break;
        }
        case op_drop: {
            auto idx  = read<size_t>(in, is_valid_size(vars[src]));
            vars[dst] = vars[src].drop(idx);
            break;
        }
        case op_concat: {
            auto src2 = read<char>(in, is_valid_var);
            if (can_concat(vars[src], vars[src2]))
                vars[dst] = vars[src] + vars[src2];
            break;
        }
        case op_push_back_move: {
            vars[dst] = std::move(vars[src]).push_back(21);
            break;
        }
        case op_update_move: {
            auto idx = read<size_t>(in, is_valid_index(vars[src]));
            vars[dst] =
                std::move(vars[src]).update(idx, [](auto x) { return x + 1; });
            break;
        }
        case op_take_move: {
            auto idx  = read<size_t>(in, is_valid_size(vars[src]));
            vars[dst] = std::move(vars[src]).take(idx);
            break;
        }
        case op_drop_move: {
            auto idx  = read<size_t>(in, is_valid_size(vars[src]));
            vars[dst] = std::move(vars[src]).drop(idx);
            break;
        }
        case op_concat_move_l: {
            auto src2 = read<char>(in, is_valid_var_neq(src));
            if (can_concat(vars[src], vars[src2]))
                vars[dst] = std::move(vars[src]) + vars[src2];
            break;
        }
        case op_concat_move_r: {
            auto src2 = read<char>(in, is_valid_var_neq(src));
            if (can_concat(vars[src], vars[src2]))
                vars[dst] = vars[src] + std::move(vars[src2]);
            break;
        }
        case op_concat_move_lr: {
            auto src2 = read<char>(in, is_valid_var_neq(src));
            if (can_concat(vars[src], vars[src2]))
                vars[dst] = std::move(vars[src]) + std::move(vars[src2]);
        }
        case op_compare: {
            using std::swap;
            if (vars[src] == vars[dst])
                swap(vars[src], vars[dst]);
            break;
        }
        case op_erase: {
            auto idx  = read<size_t>(in, is_valid_index(vars[src]));
            vars[dst] = vars[src].erase(idx);
            break;
        }
        case op_insert: {
            auto idx  = read<size_t>(in, is_valid_size(vars[src]));
            vars[dst] = vars[src].insert(idx, immer::box<int>{42});
            break;
        }
        default:
            break;
        };
        return true;
    });
}