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/*
* Copyright 2016 WebAssembly Community Group participants
*
* 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.
*/
//
// A WebAssembly optimizer, loads code, optionally runs passes on it,
// then writes it.
//
#include <memory>
#include "pass.h"
#include "support/command-line.h"
#include "support/file.h"
#include "wasm-printing.h"
#include "wasm-s-parser.h"
#include "wasm-validator.h"
using namespace wasm;
//
// main
//
int main(int argc, const char* argv[]) {
Name entry;
std::vector<std::string> passes;
PassOptions passOptions;
Options options("wasm-opt", "Optimize .wast files");
options
.add("--output", "-o", "Output file (stdout if not specified)",
Options::Arguments::One,
[](Options* o, const std::string& argument) {
o->extra["output"] = argument;
Colors::disable();
})
.add("", "-O", "execute default optimization passes",
Options::Arguments::Zero,
[&passes, &passOptions](Options*, const std::string&) {
passOptions.setDefaultOptimizationOptions();
passes.push_back("O");
})
.add("", "-Os", "execute default optimization passes, focusing on code size",
Options::Arguments::Zero,
[&passes, &passOptions](Options*, const std::string&) {
passOptions.setDefaultOptimizationOptions();
passOptions.shrinkLevel = 1;
passes.push_back("O");
})
.add("--shrink-level", "-s", "How much to focus on shrinking code size",
Options::Arguments::One,
[&passOptions](Options* o, const std::string& argument) {
passOptions.shrinkLevel = atoi(argument.c_str());
})
.add_positional("INFILE", Options::Arguments::One,
[](Options* o, const std::string& argument) {
o->extra["infile"] = argument;
});
for (const auto& p : PassRegistry::get()->getRegisteredNames()) {
options.add(
std::string("--") + p, "", PassRegistry::get()->getPassDescription(p),
Options::Arguments::Zero,
[&passes, p](Options*, const std::string&) { passes.push_back(p); });
}
options.parse(argc, argv);
auto input(read_file<std::string>(options.extra["infile"], Flags::Text, options.debug ? Flags::Debug : Flags::Release));
Module wasm;
try {
if (options.debug) std::cerr << "s-parsing..." << std::endl;
SExpressionParser parser(const_cast<char*>(input.c_str()));
Element& root = *parser.root;
if (options.debug) std::cerr << "w-parsing..." << std::endl;
SExpressionWasmBuilder builder(wasm, *root[0]);
} catch (ParseException& p) {
p.dump(std::cerr);
Fatal() << "error in parsing input";
}
if (!WasmValidator().validate(wasm)) {
Fatal() << "error in validating input";
}
if (passes.size() > 0) {
if (options.debug) std::cerr << "running passes...\n";
PassRunner passRunner(&wasm, passOptions);
if (options.debug) passRunner.setDebug(true);
for (auto& passName : passes) {
if (passName == "O") {
passRunner.addDefaultOptimizationPasses();
} else {
passRunner.add(passName);
}
}
passRunner.run();
assert(WasmValidator().validate(wasm));
}
if (options.extra.count("output") > 0) {
if (options.debug) std::cerr << "writing..." << std::endl;
Output output(options.extra["output"], Flags::Text, options.debug ? Flags::Debug : Flags::Release);
WasmPrinter::printModule(&wasm, output.getStream());
}
}
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