dawn-cmake/fuzzers/tint_regex_fuzzer/fuzzer.cc

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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 <cassert>
#include <cstddef>
#include <cstdint>
#include "fuzzers/random_generator.h"
#include "fuzzers/tint_common_fuzzer.h"
#include "fuzzers/tint_regex_fuzzer/cli.h"
#include "fuzzers/tint_regex_fuzzer/override_cli_params.h"
#include "fuzzers/tint_regex_fuzzer/wgsl_mutator.h"
#include "fuzzers/transform_builder.h"
#include "src/reader/wgsl/parser.h"
#include "src/writer/wgsl/generator.h"
namespace tint {
namespace fuzzers {
namespace regex_fuzzer {
namespace {
CliParams cli_params{};
enum class MutationKind {
kSwapIntervals,
kDeleteInterval,
kDuplicateInterval,
kReplaceIdentifier,
kReplaceLiteral,
kInsertReturnStatement,
kNumMutationKinds
};
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) {
std::string wgsl_code(data, data + size);
const std::vector<std::string> delimiters{";"};
RandomGenerator generator(seed);
std::string delimiter =
delimiters[generator.GetUInt32(static_cast<uint32_t>(delimiters.size()))];
MutationKind mutation_kind = static_cast<MutationKind>(generator.GetUInt32(
static_cast<uint32_t>(MutationKind::kNumMutationKinds)));
switch (mutation_kind) {
case MutationKind::kSwapIntervals:
if (!SwapRandomIntervals(delimiter, wgsl_code, generator)) {
return 0;
}
break;
case MutationKind::kDeleteInterval:
if (!DeleteRandomInterval(delimiter, wgsl_code, generator)) {
return 0;
}
break;
case MutationKind::kDuplicateInterval:
if (!DuplicateRandomInterval(delimiter, wgsl_code, generator)) {
return 0;
}
break;
case MutationKind::kReplaceIdentifier:
if (!ReplaceRandomIdentifier(wgsl_code, generator)) {
return 0;
}
break;
case MutationKind::kReplaceLiteral:
if (!ReplaceRandomIntLiteral(wgsl_code, generator)) {
return 0;
}
break;
case MutationKind::kInsertReturnStatement:
if (!InsertReturnStatement(wgsl_code, generator)) {
return 0;
}
break;
default:
assert(false && "Unreachable");
return 0;
}
if (wgsl_code.size() > max_size) {
return 0;
}
memcpy(data, wgsl_code.c_str(), wgsl_code.size());
return wgsl_code.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::transform::Robustness>();
CommonFuzzer fuzzer(InputFormat::kWGSL, target.output_format);
fuzzer.EnableInspector();
fuzzer.SetTransformManager(tb.manager(), tb.data_map());
fuzzer.Run(data, size);
}
return 0;
}
} // namespace
} // namespace regex_fuzzer
} // namespace fuzzers
} // namespace tint