1 files changed, 169 insertions, 0 deletions
diff --git a/third_party/wasm2c/src/tools/wasm2c.cc b/third_party/wasm2c/src/tools/wasm2c.cc
new file mode 100644
index 0000000000..680be01045
--- /dev/null
+++ b/third_party/wasm2c/src/tools/wasm2c.cc
@@ -0,0 +1,169 @@
+/*
+ * 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 "src/apply-names.h"
+#include "src/binary-reader.h"
+#include "src/binary-reader-ir.h"
+#include "src/error-formatter.h"
+#include "src/feature.h"
+#include "src/generate-names.h"
+#include "src/ir.h"
+#include "src/option-parser.h"
+#include "src/stream.h"
+#include "src/validator.h"
+#include "src/wast-lexer.h"
+
+#include "src/c-writer.h"
+
+using namespace wabt;
+
+static int s_verbose;
+static std::string s_infile;
+static std::string s_outfile;
+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 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(
+      'n', "modname", "MODNAME",
+      "Unique name for the module being generated. Each wasm sandboxed module in a single application should have a unique name.",
+      [](const char* argument) {
+        s_write_c_options.mod_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);
+
+  // TODO(binji): currently wasm2c doesn't support any non-default feature
+  // flags.
+  bool any_non_default_feature = false;
+#define WABT_FEATURE(variable, flag, default_, help) \
+  any_non_default_feature |= (s_features.variable##_enabled() != default_);
+#include "src/feature.def"
+#undef WABT_FEATURE
+
+  if (any_non_default_feature) {
+    fprintf(stderr, "wasm2c currently support only default feature flags.\n");
+    exit(1);
+  }
+}
+
+// TODO(binji): copied from binary-writer-spec.cc, probably should share.
+static string_view strip_extension(string_view s) {
+  string_view ext = s.substr(s.find_last_of('.'));
+  string_view result = s;
+
+  if (ext == ".c")
+    result.remove_suffix(ext.length());
+  return result;
+}
+
+int ProgramMain(int argc, char** argv) {
+  Result result;
+
+  InitStdio();
+  ParseOptions(argc, argv);
+
+  std::vector<uint8_t> file_data;
+  result = ReadFile(s_infile.c_str(), &file_data);
+  if (Succeeded(result)) {
+    Errors errors;
+    Module module;
+    const bool kStopOnFirstError = true;
+    const bool kFailOnCustomSectionError = true;
+    ReadBinaryOptions options(s_features, s_log_stream.get(),
+                              s_read_debug_names, kStopOnFirstError,
+                              kFailOnCustomSectionError);
+    result = ReadBinaryIr(s_infile.c_str(), file_data.data(), file_data.size(),
+                          options, &errors, &module);
+    if (Succeeded(result)) {
+      if (Succeeded(result)) {
+        ValidateOptions options(s_features);
+        result = ValidateModule(&module, &errors, options);
+        result |= GenerateNames(&module);
+      }
+
+      if (Succeeded(result)) {
+        /* TODO(binji): This shouldn't fail; if a name can't be applied
+         * (because the index is invalid, say) it should just be skipped. */
+        Result dummy_result = ApplyNames(&module);
+        WABT_USE(dummy_result);
+      }
+
+      if (Succeeded(result)) {
+        if (!s_outfile.empty()) {
+          std::string header_name =
+              strip_extension(s_outfile).to_string() + ".h";
+          FileStream c_stream(s_outfile.c_str());
+          FileStream h_stream(header_name);
+          result = WriteC(&c_stream, &h_stream, header_name.c_str(), &module,
+                          s_write_c_options);
+        } else {
+          FileStream stream(stdout);
+          result =
+              WriteC(&stream, &stream, "wasm.h", &module, s_write_c_options);
+        }
+      }
+    }
+    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
+}
+