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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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cstddef>
#include <cstdint>
#include "src/tint/fuzzers/random_generator.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/cli.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/mutator.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/override_cli_params.h"
#include "src/tint/fuzzers/tint_common_fuzzer.h"
#include "src/tint/fuzzers/transform_builder.h"
#include "src/tint/lang/wgsl/reader/reader.h"
#include "src/tint/lang/wgsl/writer/writer.h"
#include "testing/libfuzzer/libfuzzer_exports.h"
namespace tint::fuzzers::ast_fuzzer {
namespace {
CliParams cli_params{};
extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
// Parse CLI parameters. `ParseCliParams` will call `exit` if some parameter
// is invalid.
cli_params = ParseCliParams(argc, *argv);
// For some fuzz targets it is desirable to force the values of certain CLI
// parameters after parsing.
OverrideCliParams(cli_params);
return 0;
}
extern "C" size_t LLVMFuzzerCustomMutator(uint8_t* data,
size_t size,
size_t max_size,
unsigned seed) {
Source::File file("test.wgsl", {reinterpret_cast<char*>(data), size});
auto program = wgsl::reader::Parse(&file);
if (!program.IsValid()) {
std::cout << "Trying to mutate an invalid program:" << std::endl
<< program.Diagnostics().str() << std::endl;
return 0;
}
// Run the mutator.
RandomGenerator generator(seed);
ProbabilityContext probability_context(&generator);
program = Mutate(std::move(program), &probability_context, cli_params.enable_all_mutations,
cli_params.mutation_batch_size, nullptr);
if (!program.IsValid()) {
std::cout << "Mutator produced invalid WGSL:" << std::endl
<< " seed: " << seed << std::endl
<< program.Diagnostics().str() << std::endl;
return 0;
}
auto result = wgsl::writer::Generate(&program, wgsl::writer::Options());
if (!result) {
std::cout << "Can't generate WGSL for a valid tint::Program:" << std::endl
<< result.Failure() << std::endl;
return 0;
}
if (result->wgsl.size() > max_size) {
return 0;
}
// No need to worry about the \0 here. The reason is that if \0 is included by
// developer by mistake, it will be considered a part of the string and will
// cause all sorts of strange bugs. Thus, unless `data` below is used as a raw
// C string, the \0 symbol should be ignored.
std::memcpy( // NOLINT - clang-tidy warns about lack of null termination.
data, result->wgsl.data(), result->wgsl.size());
return result->wgsl.size();
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size == 0) {
return 0;
}
struct Target {
FuzzingTarget fuzzing_target;
OutputFormat output_format;
const char* name;
};
Target targets[] = {{FuzzingTarget::kWgsl, OutputFormat::kWGSL, "WGSL"},
{FuzzingTarget::kHlsl, OutputFormat::kHLSL, "HLSL"},
{FuzzingTarget::kMsl, OutputFormat::kMSL, "MSL"},
{FuzzingTarget::kSpv, OutputFormat::kSpv, "SPV"}};
for (auto target : targets) {
if ((target.fuzzing_target & cli_params.fuzzing_target) != target.fuzzing_target) {
continue;
}
TransformBuilder tb(data, size);
tb.AddTransform<tint::ast::transform::Robustness>();
CommonFuzzer fuzzer(InputFormat::kWGSL, target.output_format);
fuzzer.SetTransformManager(tb.manager(), tb.data_map());
fuzzer.Run(data, size);
if (fuzzer.HasErrors()) {
std::cout << "Fuzzing " << target.name << " produced an error" << std::endl
<< fuzzer.Diagnostics().str() << std::endl;
}
}
return 0;
}
} // namespace
} // namespace tint::fuzzers::ast_fuzzer