merge(3p/immer): Subtree merge at 'ad3e3556d' as 'third_party/immer' r/1299

Change-Id: I9636a41ad44b4218293833fd3e9456d9b07c731b

1 files changed, 82 insertions, 0 deletions

diff --git a/third_party/immer/extra/fuzzer/vector.cpp b/third_party/immer/extra/fuzzer/vector.cpp
new file mode 100644
index 000000000000..b04cbcee870c
--- /dev/null
+++ b/third_party/immer/extra/fuzzer/vector.cpp
@@ -0,0 +1,82 @@
+//
+// 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/vector.hpp>
+
+#include <array>
+
+extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t* data,
+                                      std::size_t size)
+{
+    constexpr auto var_count = 4;
+    constexpr auto bits      = 2;
+
+    using vector_t =
+        immer::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_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(); };
+    };
+
+    return fuzzer_input{data, size}.run([&](auto& in) {
+        enum ops
+        {
+            op_push_back,
+            op_update,
+            op_take,
+            op_push_back_move,
+            op_update_move,
+            op_take_move,
+        };
+        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_push_back_move: {
+            vars[dst] = std::move(vars[src]).push_back(12);
+            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;
+        }
+        default:
+            break;
+        };
+        return true;
+    });
+}