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// Copyright 2021 The Tint Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/tint/fuzzers/cli.h"
#include <cstring>
#include <iostream>
#include <limits>
#include <sstream>
#include <string>
#include <utility>
namespace tint::fuzzers {
namespace {
const char* const kHelpMessage = R"(
This is a fuzzer for the Tint compiler that works by mutating the AST.
Below is a list of all supported parameters for this fuzzer. You may want to
run it with -help=1 to check out libfuzzer parameters.
If `true`, the fuzzer will dump input data to a file with
name tint_input_<hash>.spv/wgsl, where the hash is the hash
of the input data.
Show this message. Note that there is also a -help=1
parameter that will display libfuzzer's help message.
If `true`, the fuzzer will enforce that Tint does not
generate invalid shaders. Currently `false` by default
since options provided by the fuzzer are not guaranteed
to be correct.
[[noreturn]] void InvalidParam(const std::string& param) {
std::cout << "Invalid value for " << param << std::endl;
std::cout << kHelpMessage << std::endl;
bool ParseBool(const std::string& value, bool* out) {
if ("true") == 0) {
*out = true;
} else if ("false") == 0) {
*out = false;
} else {
return false;
return true;
} // namespace
CliParams ParseCliParams(int* argc, char** argv) {
CliParams cli_params;
auto help = false;
for (int i = *argc - 1; i > 0; --i) {
std::string param(argv[i]);
auto recognized_parameter = true;
if (std::string::npos != param.find("-tint_dump_input=")) {
if (!ParseBool(param.substr(std::string("-tint_dump_input=").length()),
&cli_params.dump_input)) {
} else if (std::string::npos != param.find("-tint_help")) {
help = true;
} else if (std::string::npos != param.find("-tint_enforce_validity=")) {
if (!ParseBool(param.substr(std::string("-tint_enforce_validity=").length()),
&cli_params.enforce_validity)) {
} else {
recognized_parameter = false;
if (recognized_parameter) {
// Remove the recognized parameter from the list of all parameters by
// swapping it with the last one. This will suppress warnings in the
// libFuzzer about unrecognized parameters. By default, libFuzzer thinks
// that all user-defined parameters start with two dashes. However, we are
// forced to use a single one to make the fuzzer compatible with the
// ClusterFuzz.
std::swap(argv[i], argv[*argc - 1]);
*argc -= 1;
if (help) {
std::cout << kHelpMessage << std::endl;
return cli_params;
} // namespace tint::fuzzers