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diff --git a/third_party/wasm2c/src/tools/wasm2c.cc b/third_party/wasm2c/src/tools/wasm2c.cc
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+/*
+ * Copyright 2017 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.
+ */
+
+#include <cassert>
+#include <cinttypes>
+#include <cstdio>
+#include <cstdlib>
+
+#include "wabt/apply-names.h"
+#include "wabt/binary-reader-ir.h"
+#include "wabt/binary-reader.h"
+#include "wabt/error-formatter.h"
+#include "wabt/feature.h"
+#include "wabt/filenames.h"
+#include "wabt/generate-names.h"
+#include "wabt/ir.h"
+#include "wabt/option-parser.h"
+#include "wabt/result.h"
+#include "wabt/stream.h"
+#include "wabt/validator.h"
+#include "wabt/wast-lexer.h"
+
+#include "wabt/c-writer.h"
+
+using namespace wabt;
+
+static int s_verbose;
+static std::string s_infile;
+static std::string s_outfile;
+static unsigned int s_num_outputs = 1;
+static Features s_features;
+static WriteCOptions s_write_c_options;
+static bool s_read_debug_names = true;
+static std::unique_ptr<FileStream> s_log_stream;
+
+static const char s_description[] =
+ R"( Read a file in the WebAssembly binary format, and convert it to
+ a C source file and header.
+
+examples:
+ # parse binary file test.wasm and write test.c and test.h
+ $ wasm2c test.wasm -o test.c
+
+ # parse test.wasm, write test.c and test.h, but ignore the debug names, if any
+ $ wasm2c test.wasm --no-debug-names -o test.c
+)";
+
+static const std::string supported_features[] = {
+ "multi-memory", "multi-value", "sign-extension", "saturating-float-to-int",
+ "exceptions", "memory64", "extended-const", "simd"};
+
+static bool IsFeatureSupported(const std::string& feature) {
+ return std::find(std::begin(supported_features), std::end(supported_features),
+ feature) != std::end(supported_features);
+};
+
+static void ParseOptions(int argc, char** argv) {
+ OptionParser parser("wasm2c", s_description);
+
+ parser.AddOption('v', "verbose", "Use multiple times for more info", []() {
+ s_verbose++;
+ s_log_stream = FileStream::CreateStderr();
+ });
+ parser.AddOption(
+ 'o', "output", "FILENAME",
+ "Output file for the generated C source file, by default use stdout",
+ [](const char* argument) {
+ s_outfile = argument;
+ ConvertBackslashToSlash(&s_outfile);
+ });
+ parser.AddOption(
+ '\0', "num-outputs", "NUM", "Number of output files to write",
+ [](const char* argument) { s_num_outputs = atoi(argument); });
+ parser.AddOption(
+ 'n', "module-name", "MODNAME",
+ "Unique name for the module being generated. This name is prefixed to\n"
+ "each of the generaed C symbols. By default, the module name from the\n"
+ "names section is used. If that is not present the name of the input\n"
+ "file is used as the default.\n",
+ [](const char* argument) { s_write_c_options.module_name = argument; });
+ s_features.AddOptions(&parser);
+ parser.AddOption("no-debug-names", "Ignore debug names in the binary file",
+ []() { s_read_debug_names = false; });
+ parser.AddArgument("filename", OptionParser::ArgumentCount::One,
+ [](const char* argument) {
+ s_infile = argument;
+ ConvertBackslashToSlash(&s_infile);
+ });
+ parser.Parse(argc, argv);
+
+ bool any_non_supported_feature = false;
+#define WABT_FEATURE(variable, flag, default_, help) \
+ any_non_supported_feature |= \
+ (s_features.variable##_enabled() != default_) && \
+ s_features.variable##_enabled() && !IsFeatureSupported(flag);
+#include "wabt/feature.def"
+#undef WABT_FEATURE
+
+ if (any_non_supported_feature) {
+ fprintf(stderr,
+ "wasm2c currently only supports a limited set of features.\n");
+ exit(1);
+ }
+}
+
+// TODO(binji): copied from binary-writer-spec.cc, probably should share.
+static std::string_view strip_extension(std::string_view s) {
+ std::string_view ext = s.substr(s.find_last_of('.'));
+ std::string_view result = s;
+
+ if (ext == ".c")
+ result.remove_suffix(ext.length());
+ return result;
+}
+
+Result Wasm2cMain(Errors& errors) {
+ if (s_num_outputs < 1) {
+ fprintf(stderr, "Number of output files must be positive.\n");
+ return Result::Error;
+ }
+
+ std::vector<uint8_t> file_data;
+ CHECK_RESULT(ReadFile(s_infile.c_str(), &file_data));
+
+ Module module;
+ const bool kStopOnFirstError = true;
+ const bool kFailOnCustomSectionError = true;
+ ReadBinaryOptions options(s_features, s_log_stream.get(), s_read_debug_names,
+ kStopOnFirstError, kFailOnCustomSectionError);
+ CHECK_RESULT(ReadBinaryIr(s_infile.c_str(), file_data.data(),
+ file_data.size(), options, &errors, &module));
+ CHECK_RESULT(ValidateModule(&module, &errors, s_features));
+ CHECK_RESULT(GenerateNames(&module));
+ /* TODO(binji): This shouldn't fail; if a name can't be applied
+ * (because the index is invalid, say) it should just be skipped. */
+ ApplyNames(&module);
+
+ if (!s_outfile.empty()) {
+ std::string header_name_full =
+ std::string(strip_extension(s_outfile)) + ".h";
+ std::vector<FileStream> c_streams;
+ if (s_num_outputs == 1) {
+ c_streams.emplace_back(s_outfile.c_str());
+ } else {
+ std::string output_prefix{strip_extension(s_outfile)};
+ for (unsigned int i = 0; i < s_num_outputs; i++) {
+ c_streams.emplace_back(output_prefix + "_" + std::to_string(i) + ".c");
+ }
+ }
+ std::vector<Stream*> c_stream_ptrs;
+ for (auto& s : c_streams) {
+ c_stream_ptrs.emplace_back(&s);
+ }
+ FileStream h_stream(header_name_full);
+ std::string_view header_name = GetBasename(header_name_full);
+ if (s_write_c_options.module_name.empty()) {
+ s_write_c_options.module_name = module.name;
+ if (s_write_c_options.module_name.empty()) {
+ // In the absence of module name in the names section use the filename.
+ s_write_c_options.module_name = StripExtension(GetBasename(s_infile));
+ }
+ }
+ if (s_num_outputs == 1) {
+ CHECK_RESULT(WriteC(std::move(c_stream_ptrs), &h_stream, c_stream_ptrs[0],
+ std::string(header_name).c_str(), "", &module,
+ s_write_c_options));
+ } else {
+ std::string header_impl_name_full =
+ std::string(strip_extension(s_outfile)) + "-impl.h";
+ FileStream h_impl_stream(header_impl_name_full);
+ std::string_view header_impl_name = GetBasename(header_impl_name_full);
+ CHECK_RESULT(WriteC(std::move(c_stream_ptrs), &h_stream, &h_impl_stream,
+ std::string(header_name).c_str(),
+ std::string(header_impl_name).c_str(), &module,
+ s_write_c_options));
+ }
+ } else {
+ FileStream stream(stdout);
+ CHECK_RESULT(WriteC({&stream}, &stream, &stream, "wasm.h", "", &module,
+ s_write_c_options));
+ }
+
+ return Result::Ok;
+}
+
+int ProgramMain(int argc, char** argv) {
+ Result result;
+
+ InitStdio();
+ ParseOptions(argc, argv);
+
+ Errors errors;
+ result = Wasm2cMain(errors);
+ FormatErrorsToFile(errors, Location::Type::Binary);
+
+ return result != Result::Ok;
+}
+
+int main(int argc, char** argv) {
+ WABT_TRY
+ return ProgramMain(argc, argv);
+ WABT_CATCH_BAD_ALLOC_AND_EXIT
+}