124 lines
3.7 KiB
C++
124 lines
3.7 KiB
C++
// Copyright 2022 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 "src/tint/bench/benchmark.h"
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#include <filesystem>
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#include <sstream>
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#include <utility>
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#include <vector>
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namespace tint::bench {
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namespace {
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std::filesystem::path kInputFileDir;
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/// Copies the content from the file named `input_file` to `buffer`,
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/// assuming each element in the file is of type `T`. If any error occurs,
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/// writes error messages to the standard error stream and returns false.
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/// Assumes the size of a `T` object is divisible by its required alignment.
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/// @returns true if we successfully read the file.
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template <typename T>
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std::variant<std::vector<T>, Error> ReadFile(const std::string& input_file) {
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FILE* file = nullptr;
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#if defined(_MSC_VER)
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fopen_s(&file, input_file.c_str(), "rb");
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#else
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file = fopen(input_file.c_str(), "rb");
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#endif
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if (!file) {
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return Error{"Failed to open " + input_file};
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}
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fseek(file, 0, SEEK_END);
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const auto file_size = static_cast<size_t>(ftell(file));
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if (0 != (file_size % sizeof(T))) {
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std::stringstream err;
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err << "File " << input_file
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<< " does not contain an integral number of objects: " << file_size
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<< " bytes in the file, require " << sizeof(T) << " bytes per object";
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fclose(file);
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return Error{err.str()};
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}
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fseek(file, 0, SEEK_SET);
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std::vector<T> buffer;
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buffer.resize(file_size / sizeof(T));
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size_t bytes_read = fread(buffer.data(), 1, file_size, file);
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fclose(file);
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if (bytes_read != file_size) {
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return Error{"Failed to read " + input_file};
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}
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return buffer;
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}
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bool FindBenchmarkInputDir() {
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// Attempt to find the benchmark input files by searching up from the current
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// working directory.
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auto path = std::filesystem::current_path();
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while (std::filesystem::is_directory(path)) {
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auto test = path / "test" / "tint" / "benchmark";
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if (std::filesystem::is_directory(test)) {
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kInputFileDir = test;
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return true;
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}
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auto parent = path.parent_path();
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if (path == parent) {
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break;
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}
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path = parent;
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}
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return false;
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}
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} // namespace
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std::variant<tint::Source::File, Error> LoadInputFile(std::string name) {
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auto path = (kInputFileDir / name).string();
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auto data = ReadFile<uint8_t>(path);
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if (auto* buf = std::get_if<std::vector<uint8_t>>(&data)) {
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return tint::Source::File(path, std::string(buf->begin(), buf->end()));
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}
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return std::get<Error>(data);
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}
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std::variant<ProgramAndFile, Error> LoadProgram(std::string name) {
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auto res = bench::LoadInputFile(name);
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if (auto err = std::get_if<bench::Error>(&res)) {
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return *err;
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}
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auto& file = std::get<Source::File>(res);
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auto program = reader::wgsl::Parse(&file);
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if (program.Diagnostics().contains_errors()) {
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return Error{program.Diagnostics().str()};
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}
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return ProgramAndFile{std::move(program), std::move(file)};
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}
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} // namespace tint::bench
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int main(int argc, char** argv) {
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benchmark::Initialize(&argc, argv);
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if (benchmark::ReportUnrecognizedArguments(argc, argv)) {
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return 1;
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}
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if (!tint::bench::FindBenchmarkInputDir()) {
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std::cerr << "failed to locate benchmark input files" << std::endl;
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return 1;
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}
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benchmark::RunSpecifiedBenchmarks();
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}
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