dawn-cmake/samples/main.cc

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2020-03-02 20:47:43 +00:00
// Copyright 2020 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 <fstream>
#include <iostream>
#include <memory>
#include <vector>
#include "spirv-tools/libspirv.hpp"
#include "src/reader/reader.h"
#include "src/reader/wgsl/parser.h"
#include "src/type_determiner.h"
#include "src/validator.h"
#include "src/writer/spv/generator.h"
#include "src/writer/wgsl/generator.h"
#include "src/writer/writer.h"
namespace {
enum class Format {
kNone = -1,
kSpirv,
kSpvAsm,
kWgsl,
};
struct Options {
bool show_help = false;
std::string input_filename;
std::string output_name = "";
std::string output_ext = "spv";
bool parse_only = false;
bool dump_ast = false;
Format format = Format::kSpirv;
};
const char kUsage[] = R"(Usage: tint [options] SCRIPT [SCRIPTS...]
options:
--format <spirv|spvasm|wgsl> -- Output format
--output-name <name> -- Name for the output file, without extension
--parse-only -- Stop after parsing the input
--dump-ast -- Dump the generated AST to stdout
-h -- This help text)";
Format parse_format(const std::string& fmt) {
if (fmt == "spirv")
return Format::kSpirv;
if (fmt == "spvasm")
return Format::kSpvAsm;
if (fmt == "wgsl")
return Format::kWgsl;
return Format::kNone;
}
bool ParseArgs(const std::vector<std::string>& args, Options* opts) {
for (size_t i = 1; i < args.size(); ++i) {
const std::string& arg = args[i];
if (arg == "--format") {
++i;
if (i >= args.size()) {
std::cerr << "Missing value for --format argument." << std::endl;
return false;
}
opts->format = parse_format(args[i]);
if (opts->format == Format::kNone) {
std::cerr << "Unknown output format: " << args[i] << std::endl;
return false;
}
if (opts->format == Format::kSpvAsm)
opts->output_ext = "spvasm";
else if (opts->format == Format::kWgsl)
opts->output_ext = "wgsl";
}
if (arg == "--output-name") {
++i;
if (i >= args.size()) {
std::cerr << "Missing value for --output_name argument." << std::endl;
return false;
}
opts->output_name = args[i];
} else if (arg == "-h" || arg == "--help") {
opts->show_help = true;
} else if (arg == "--parse-only") {
opts->parse_only = true;
} else if (arg == "--dump-ast") {
opts->dump_ast = true;
} else if (!arg.empty()) {
opts->input_filename = arg;
}
}
return true;
}
std::vector<uint8_t> ReadFile(const std::string& input_file) {
FILE* file = nullptr;
#if defined(_MSC_VER)
fopen_s(&file, input_file.c_str(), "rb");
#else
file = fopen(input_file.c_str(), "rb");
#endif
if (!file) {
std::cerr << "Failed to open " << input_file << std::endl;
return {};
}
fseek(file, 0, SEEK_END);
uint64_t tell_file_size = static_cast<uint64_t>(ftell(file));
if (tell_file_size <= 0) {
std::cerr << "Input file of incorrect size: " << input_file << std::endl;
fclose(file);
return {};
}
fseek(file, 0, SEEK_SET);
size_t file_size = static_cast<size_t>(tell_file_size);
std::vector<uint8_t> data;
data.resize(file_size);
size_t bytes_read = fread(data.data(), sizeof(uint8_t), file_size, file);
fclose(file);
if (bytes_read != file_size) {
std::cerr << "Failed to read " << input_file << std::endl;
return {};
}
return data;
}
std::string Disassemble(const std::vector<uint32_t>& data) {
std::string spv_errors;
spv_target_env target_env = SPV_ENV_UNIVERSAL_1_0;
auto msg_consumer = [&spv_errors](spv_message_level_t level, const char*,
const spv_position_t& position,
const char* message) {
switch (level) {
case SPV_MSG_FATAL:
case SPV_MSG_INTERNAL_ERROR:
case SPV_MSG_ERROR:
spv_errors += "error: line " + std::to_string(position.index) + ": " +
message + "\n";
break;
case SPV_MSG_WARNING:
spv_errors += "warning: line " + std::to_string(position.index) + ": " +
message + "\n";
break;
case SPV_MSG_INFO:
spv_errors += "info: line " + std::to_string(position.index) + ": " +
message + "\n";
break;
case SPV_MSG_DEBUG:
break;
}
};
spvtools::SpirvTools tools(target_env);
tools.SetMessageConsumer(msg_consumer);
std::string result;
tools.Disassemble(data, &result,
SPV_BINARY_TO_TEXT_OPTION_INDENT |
SPV_BINARY_TO_TEXT_OPTION_FRIENDLY_NAMES);
return result;
}
} // namespace
int main(int argc, const char** argv) {
std::vector<std::string> args(argv, argv + argc);
Options options;
if (!ParseArgs(args, &options)) {
std::cerr << "Failed to parse arguments." << std::endl;
return 1;
}
if (options.show_help) {
std::cout << kUsage << std::endl;
return 0;
}
if (options.input_filename == "") {
std::cerr << "Input file missing" << std::endl;
std::cout << kUsage << std::endl;
return 1;
}
auto data = ReadFile(options.input_filename);
if (data.size() == 0)
return 1;
std::unique_ptr<tint::reader::Reader> reader;
std::string ext = "wgsl";
if (options.input_filename.size() > 4 &&
options.input_filename.substr(options.input_filename.size() - 4) ==
"wgsl") {
reader = std::make_unique<tint::reader::wgsl::Parser>(
std::string(data.begin(), data.end()));
}
if (!reader) {
std::cerr << "Failed to create reader for input file: "
<< options.input_filename << std::endl;
return 1;
}
if (!reader->Parse()) {
std::cerr << reader->error() << std::endl;
return 1;
}
auto module = reader->module();
if (options.dump_ast) {
std::cout << std::endl << module.to_str() << std::endl;
}
if (options.parse_only) {
return 1;
}
tint::TypeDeterminer td;
if (!td.Determine(&module)) {
std::cerr << td.error() << std::endl;
return 1;
}
tint::Validator v;
if (!v.Validate(module)) {
std::cerr << v.error() << std::endl;
return 1;
}
std::unique_ptr<tint::writer::Writer> writer;
if (options.format == Format::kSpirv || options.format == Format::kSpvAsm) {
writer = std::make_unique<tint::writer::spv::Generator>(std::move(module));
} else if (options.format == Format::kWgsl) {
writer = std::make_unique<tint::writer::wgsl::Generator>(std::move(module));
} else {
std::cerr << "Unknown output format specified" << std::endl;
return 1;
}
if (!writer->Generate()) {
std::cerr << "Failed to generate SPIR-V: " << writer->error() << std::endl;
return 1;
}
if (options.format == Format::kSpvAsm) {
auto w = static_cast<tint::writer::spv::Generator*>(writer.get());
auto str = Disassemble(w->result());
// TODO(dsinclair): Write to file if output_file given
std::cout << str << std::endl;
} else if (options.format == Format::kSpirv) {
// auto w = static_cast<tint::writer::spv::Generator*>(writer.get());
// TODO(dsincliair): Write to to file
} else if (options.format == Format::kWgsl) {
auto w = static_cast<tint::writer::wgsl::Generator*>(writer.get());
std::cout << w->result() << std::endl;
}
return 0;
}