DawnSPVCglslFastFuzzer.cpp

// Copyright 2019 The Dawn 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 <cstdint>
#include <string>
#include <vector>

#include "spvc/spvc.hpp"

extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
    return 0;
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
    shaderc_spvc::Context context;
    if (!context.IsValid()) {
        return 0;
    }

    shaderc_spvc::CompilationResult result;
    shaderc_spvc::CompileOptions options;
    options.SetSourceEnvironment(shaderc_target_env_webgpu, shaderc_env_version_webgpu);
    options.SetTargetEnvironment(shaderc_target_env_vulkan, shaderc_env_version_vulkan_1_1);
    // Using the options that are used by Dawn, they appear in ShaderModuleGL.cpp
    // TODO(sarahM0): double check these option after completion of spvc integration
    options.SetFlipVertY(true);
    options.SetFixupClipspace(true);
#if defined(DAWN_PLATFORM_APPLE)
    options.SetGLSLLanguageVersion(410);
#else
    options.SetGLSLLanguageVersion(440);
#endif

    size_t sizeInU32 = size / sizeof(uint32_t);
    const uint32_t* u32Data = reinterpret_cast<const uint32_t*>(data);
    std::vector<uint32_t> input(u32Data, u32Data + sizeInU32);

    if (input.size() != 0) {
        if (context.InitializeForGlsl(input.data(), input.size(), options) ==
            shaderc_spvc_status_success) {
            context.SetUseSpvcParser(true);
            context.CompileShader(&result);
        }
    }
    return 0;
}