108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
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// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "fuzzers/cli.h"
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#include <cstring>
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#include <iostream>
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#include <limits>
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#include <sstream>
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#include <string>
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#include <utility>
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namespace tint {
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namespace fuzzers {
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namespace {
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const char* const kHelpMessage = R"(
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This is a fuzzer for the Tint compiler that works by mutating the AST.
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Below is a list of all supported parameters for this fuzzer. You may want to
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run it with -help=1 to check out libfuzzer parameters.
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-tint_dump_input=
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If `true`, the fuzzer will dump input data to a file with
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name tint_input_<hash>.spv/wgsl, where the hash is the hash
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of the input data.
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-tint_help
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Show this message. Note that there is also a -help=1
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parameter that will display libfuzzer's help message.
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)";
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bool HasPrefix(const char* str, const char* prefix) {
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return strncmp(str, prefix, strlen(prefix)) == 0;
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}
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[[noreturn]] void InvalidParam(const char* param) {
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std::cout << "Invalid value for " << param << std::endl;
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std::cout << kHelpMessage << std::endl;
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exit(1);
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}
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bool ParseBool(const char* value, bool* out) {
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if (!strcmp(value, "true")) {
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*out = true;
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} else if (!strcmp(value, "false")) {
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*out = false;
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} else {
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return false;
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}
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return true;
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}
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} // namespace
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CliParams ParseCliParams(int* argc, char** argv) {
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CliParams cli_params;
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auto help = false;
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for (int i = *argc - 1; i > 0; --i) {
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auto param = argv[i];
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auto recognized_parameter = true;
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if (HasPrefix(param, "-tint_dump_input=")) {
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if (!ParseBool(param + sizeof("-tint_dump_input=") - 1,
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&cli_params.dump_input)) {
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InvalidParam(param);
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}
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} else if (!strcmp(param, "-tint_help")) {
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help = true;
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} else {
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recognized_parameter = false;
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}
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if (recognized_parameter) {
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// Remove the recognized parameter from the list of all parameters by
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// swapping it with the last one. This will suppress warnings in the
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// libFuzzer about unrecognized parameters. By default, libFuzzer thinks
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// that all user-defined parameters start with two dashes. However, we are
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// forced to use a single one to make the fuzzer compatible with the
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// ClusterFuzz.
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std::swap(argv[i], argv[*argc - 1]);
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*argc -= 1;
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}
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}
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if (help) {
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std::cout << kHelpMessage << std::endl;
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exit(0);
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}
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return cli_params;
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}
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} // namespace fuzzers
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} // namespace tint
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