src/tint/cmd/fuzz/wgsl/main_fuzz.cc

// Copyright 2023 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <iostream>

#include "src/tint/cmd/fuzz/wgsl/fuzz.h"
#include "src/tint/utils/cli/cli.h"
#include "src/tint/utils/macros/defer.h"
#include "src/tint/utils/text/base64.h"

namespace {

tint::fuzz::wgsl::Options options;

}  // namespace

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* input, size_t size) {
    if (size > 0) {
        std::string_view wgsl(reinterpret_cast<const char*>(input), size);
        auto data = tint::DecodeBase64FromComments(wgsl);
        tint::fuzz::wgsl::Run(wgsl, data.Slice(), options);
    }
    return 0;
}

extern "C" int LLVMFuzzerInitialize(int* argc, const char*** argv) {
    tint::cli::OptionSet opts;

    tint::Vector<std::string_view, 8> arguments;
    for (int i = 1; i < *argc; i++) {
        std::string_view arg((*argv)[i]);
        if (!arg.empty()) {
            arguments.Push(arg);
        }
    }

    auto show_help = [&] {
        std::cerr << "Custom fuzzer options:" << std::endl;
        opts.ShowHelp(std::cerr);
        std::cerr << std::endl;
        // Change args to show libfuzzer help
        std::cerr << "Standard libfuzzer ";  // libfuzzer will print 'Usage:'
        static const char* help[] = {(*argv)[0], "-help=1"};
        *argc = 2;
        *argv = help;
    };

    auto& opt_help = opts.Add<tint::cli::BoolOption>("help", "shows the usage");
    auto& opt_concurrent =
        opts.Add<tint::cli::BoolOption>("concurrent", "runs the fuzzers concurrently");

    tint::cli::ParseOptions parse_opts;
    parse_opts.ignore_unknown = true;
    if (auto res = opts.Parse(arguments, parse_opts); res != tint::Success) {
        show_help();
        std::cerr << res.Failure();
        return 0;
    }

    if (opt_help.value.value_or(false)) {
        show_help();
        return 0;
    }

    options.run_concurrently = opt_concurrent.value.value_or(false);
    return 0;
}