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/*
* Copyright 2015 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.
*/
//
// asm2wasm console tool
//
#include <exception>
#include "ir/trapping.h"
#include "support/colors.h"
#include "support/command-line.h"
#include "support/file.h"
#include "wasm-builder.h"
#include "wasm-printing.h"
#include "wasm-io.h"
#include "wasm-validator.h"
#include "optimization-options.h"
#include "asm2wasm.h"
using namespace cashew;
using namespace wasm;
int main(int argc, const char *argv[]) {
bool legalizeJavaScriptFFI = true;
TrapMode trapMode = TrapMode::JS;
bool wasmOnly = false;
std::string sourceMapFilename;
std::string sourceMapUrl;
std::string symbolMap;
bool emitBinary = true;
OptimizationOptions options("asm2wasm", "Translate asm.js files to .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("--mapped-globals", "-n", "Mapped globals", Options::Arguments::One,
[](Options *o, const std::string& argument) {
std::cerr << "warning: the --mapped-globals/-m option is deprecated (a mapped globals file is no longer needed as we use wasm globals)" << std::endl;
})
.add("--mem-init", "-t", "Import a memory initialization file into the output module", Options::Arguments::One,
[](Options *o, const std::string& argument) {
o->extra["mem init"] = argument;
})
.add("--mem-base", "-mb", "Set the location to write the memory initialization (--mem-init) file (GLOBAL_BASE in emscripten). If not provided, the __memory_base global import is used.", Options::Arguments::One,
[](Options *o, const std::string& argument) {
o->extra["mem base"] = argument;
})
.add("--mem-max", "-mm", "Set the maximum size of memory in the wasm module (in bytes). -1 means no limit. Without this, TOTAL_MEMORY is used (as it is used for the initial value), or if memory growth is enabled, no limit is set. This overrides both of those.", Options::Arguments::One,
[](Options *o, const std::string& argument) {
o->extra["mem max"] = argument;
})
.add("--total-memory", "-m", "Total memory size", Options::Arguments::One,
[](Options *o, const std::string& argument) {
o->extra["total memory"] = argument;
})
.add("--table-max", "-tM", "Set the maximum size of the table. Without this, it is set depending on how many functions are in the module. -1 means no limit", Options::Arguments::One,
[](Options *o, const std::string& argument) {
o->extra["table max"] = argument;
})
.add("--no-opts", "-n", "Disable optimization passes (deprecated)", Options::Arguments::Zero,
[](Options *o, const std::string& ) {
std::cerr << "--no-opts is deprecated (use -O0, etc.)\n";
})
.add("--trap-mode", "",
"Strategy for handling potentially trapping instructions. Valid "
"values are \"allow\", \"js\", and \"clamp\"",
Options::Arguments::One,
[&trapMode](Options *o, const std::string& argument) {
try {
trapMode = trapModeFromString(argument);
} catch (std::invalid_argument& e) {
std::cerr << "Error: " << e.what() << "\n";
exit(EXIT_FAILURE);
}
})
.add("--wasm-only", "-w", "Input is in WebAssembly-only format, and not actually valid asm.js", Options::Arguments::Zero,
[&wasmOnly](Options *o, const std::string& ) {
wasmOnly = true;
})
.add("--no-legalize-javascript-ffi", "-nj", "Do not fully legalize (i64->i32, f32->f64) the imports and exports for interfacing with JS", Options::Arguments::Zero,
[&legalizeJavaScriptFFI](Options *o, const std::string& ) {
legalizeJavaScriptFFI = false;
})
.add("--debuginfo", "-g", "Emit names section in wasm binary (or full debuginfo in wast)",
Options::Arguments::Zero,
[&](Options *o, const std::string& arguments) { options.passOptions.debugInfo = true; })
.add("--source-map", "-sm", "Emit source map (if using binary output) to the specified file",
Options::Arguments::One,
[&sourceMapFilename](Options *o, const std::string& argument) { sourceMapFilename = argument; })
.add("--source-map-url", "-su", "Use specified string as source map URL",
Options::Arguments::One,
[&sourceMapUrl](Options *o, const std::string& argument) { sourceMapUrl = argument; })
.add("--symbolmap", "-s", "Emit a symbol map (indexes => names)",
Options::Arguments::One,
[&](Options *o, const std::string& argument) { symbolMap = argument; })
.add("--emit-text", "-S", "Emit text instead of binary for the output file",
Options::Arguments::Zero,
[&](Options *o, const std::string& argument) { emitBinary = false; })
.add_positional("INFILE", Options::Arguments::One,
[](Options *o, const std::string& argument) {
o->extra["infile"] = argument;
});
options.parse(argc, argv);
// finalize arguments
if (options.extra["output"].size() == 0) {
// when no output file is specified, we emit text to stdout
emitBinary = false;
}
if (options.runningDefaultOptimizationPasses()) {
if (options.passes.size() > 1) {
Fatal() << "asm2wasm can only run default optimization passes (-O, -Ox, etc.), and not specific additional passes";
}
}
const auto &tm_it = options.extra.find("total memory");
size_t totalMemory =
tm_it == options.extra.end() ? 16 * 1024 * 1024 : atoll(tm_it->second.c_str());
if (totalMemory & ~Memory::kPageMask) {
std::cerr << "Error: total memory size " << totalMemory <<
" is not a multiple of the 64k wasm page size\n";
exit(EXIT_FAILURE);
}
Asm2WasmPreProcessor pre;
// wasm binaries can contain a names section, but not full debug info --
// debug info is disabled if a map file is not specified with wasm binary
pre.debugInfo = options.passOptions.debugInfo && (!emitBinary || sourceMapFilename.size());
auto input(
read_file<std::vector<char>>(options.extra["infile"], Flags::Text, options.debug ? Flags::Debug : Flags::Release));
char *start = pre.process(input.data());
if (options.debug) std::cerr << "parsing..." << std::endl;
cashew::Parser<Ref, DotZeroValueBuilder> builder;
Ref asmjs = builder.parseToplevel(start);
if (options.debug) std::cerr << "wasming..." << std::endl;
Module wasm;
// set up memory
wasm.memory.initial = wasm.memory.max = totalMemory / Memory::kPageSize;
// import mem init file, if provided (do this before compiling the module,
// since the optimizer should see the memory segments)
const auto &memInit = options.extra.find("mem init");
if (memInit != options.extra.end()) {
auto filename = memInit->second.c_str();
auto data(read_file<std::vector<char>>(filename, Flags::Binary, options.debug ? Flags::Debug : Flags::Release));
// create the memory segment
Expression* init;
const auto &memBase = options.extra.find("mem base");
if (memBase == options.extra.end()) {
init = Builder(wasm).makeGetGlobal(MEMORY_BASE, i32);
} else {
init = Builder(wasm).makeConst(Literal(int32_t(atoi(memBase->second.c_str()))));
}
wasm.memory.segments.emplace_back(init, data);
}
// compile the code
Asm2WasmBuilder asm2wasm(wasm, pre, options.debug, trapMode, options.passOptions, legalizeJavaScriptFFI, options.runningDefaultOptimizationPasses(), wasmOnly);
asm2wasm.processAsm(asmjs);
// finalize the imported mem init
if (memInit != options.extra.end()) {
if (options.runningDefaultOptimizationPasses()) {
PassRunner runner(&wasm);
runner.setFeatures(options.passOptions.features);
runner.add("memory-packing");
runner.run();
}
}
// Set the max memory size, if requested
const auto &memMax = options.extra.find("mem max");
if (memMax != options.extra.end()) {
uint64_t max = strtoull(memMax->second.c_str(), nullptr, 10);
if (max != uint64_t(-1)) {
wasm.memory.max = max / Memory::kPageSize;
} else {
wasm.memory.max = Memory::kUnlimitedSize;
}
}
// Set the table sizes, if requested
const auto &tableMax = options.extra.find("table max");
if (tableMax != options.extra.end()) {
int max = atoi(tableMax->second.c_str());
if (max >= 0) {
wasm.table.max = max;
} else {
wasm.table.max = Table::kUnlimitedSize;
}
}
if (options.passOptions.validate) {
if (!WasmValidator().validate(wasm, options.passOptions.features)) {
WasmPrinter::printModule(&wasm);
Fatal() << "error in validating output";
}
}
if (options.debug) std::cerr << "emitting..." << std::endl;
ModuleWriter writer;
writer.setDebug(options.debug);
writer.setDebugInfo(options.passOptions.debugInfo);
writer.setSymbolMap(symbolMap);
writer.setBinary(emitBinary);
if (emitBinary) {
writer.setSourceMapFilename(sourceMapFilename);
writer.setSourceMapUrl(sourceMapUrl);
}
writer.write(wasm, options.extra["output"]);
if (options.debug) std::cerr << "done." << std::endl;
}
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