[async-iteration] implement Async-from-Sync Iterator

test/cctest/interpreter/generate-bytecode-expectations.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cstring>
 #include <fstream>
 #include <memory>
 #include <vector>
 
 #include "test/cctest/interpreter/bytecode-expectations-printer.h"
@@ skipping 25 matching lines @@
   ProgramOptions()
       : parsing_failed_(false),
         print_help_(false),
         read_raw_js_snippet_(false),
         read_from_stdin_(false),
         rebaseline_(false),
         wrap_(true),
         module_(false),
         top_level_(false),
         do_expressions_(false),
+        async_iteration_(false),
         verbose_(false) {}
 
   bool Validate() const;
   void UpdateFromHeader(std::istream& stream);   // NOLINT
   void PrintHeader(std::ostream& stream) const;  // NOLINT
 
   bool parsing_failed() const { return parsing_failed_; }
   bool print_help() const { return print_help_; }
   bool read_raw_js_snippet() const { return read_raw_js_snippet_; }
   bool read_from_stdin() const { return read_from_stdin_; }
   bool write_to_stdout() const {
     return output_filename_.empty() && !rebaseline_;
   }
   bool rebaseline() const { return rebaseline_; }
   bool wrap() const { return wrap_; }
   bool module() const { return module_; }
   bool top_level() const { return top_level_; }
   bool do_expressions() const { return do_expressions_; }
+  bool async_iteration() const { return async_iteration_; }
   bool verbose() const { return verbose_; }
   bool suppress_runtime_errors() const { return rebaseline_ && !verbose_; }
   std::vector<std::string> input_filenames() const { return input_filenames_; }
   std::string output_filename() const { return output_filename_; }
   std::string test_function_name() const { return test_function_name_; }
 
  private:
   bool parsing_failed_;
   bool print_help_;
   bool read_raw_js_snippet_;
   bool read_from_stdin_;
   bool rebaseline_;
   bool wrap_;
   bool module_;
   bool top_level_;
   bool do_expressions_;
+  bool async_iteration_;
   bool verbose_;
   std::vector<std::string> input_filenames_;
   std::string output_filename_;
   std::string test_function_name_;
 };
 
 class V8InitializationScope final {
  public:
   explicit V8InitializationScope(const char* exec_path);
   ~V8InitializationScope();
@@ skipping 68 matching lines @@
     } else if (strcmp(argv[i], "--rebaseline") == 0) {
       options.rebaseline_ = true;
     } else if (strcmp(argv[i], "--no-wrap") == 0) {
       options.wrap_ = false;
     } else if (strcmp(argv[i], "--module") == 0) {
       options.module_ = true;
     } else if (strcmp(argv[i], "--top-level") == 0) {
       options.top_level_ = true;
     } else if (strcmp(argv[i], "--do-expressions") == 0) {
       options.do_expressions_ = true;
+    } else if (strcmp(argv[i], "--async-iteration") == 0) {
+      options.async_iteration_ = true;
     } else if (strcmp(argv[i], "--verbose") == 0) {
       options.verbose_ = true;
     } else if (strncmp(argv[i], "--output=", 9) == 0) {
       options.output_filename_ = argv[i] + 9;
     } else if (strncmp(argv[i], "--test-function-name=", 21) == 0) {
       options.test_function_name_ = argv[i] + 21;
     } else if (strncmp(argv[i], "--", 2) != 0) {  // It doesn't start with --
       options.input_filenames_.push_back(argv[i]);
     } else {
       REPORT_ERROR("Unknown option " << argv[i]);
@@ skipping 82 matching lines @@
     if (line.compare(0, 8, "module: ") == 0) {
       module_ = ParseBoolean(line.c_str() + 8);
     } else if (line.compare(0, 6, "wrap: ") == 0) {
       wrap_ = ParseBoolean(line.c_str() + 6);
     } else if (line.compare(0, 20, "test function name: ") == 0) {
       test_function_name_ = line.c_str() + 20;
     } else if (line.compare(0, 11, "top level: ") == 0) {
       top_level_ = ParseBoolean(line.c_str() + 11);
     } else if (line.compare(0, 16, "do expressions: ") == 0) {
       do_expressions_ = ParseBoolean(line.c_str() + 16);
+    } else if (line.compare(0, 17, "async iteration: ") == 0) {
+      async_iteration_ = ParseBoolean(line.c_str() + 17);
     } else if (line == "---") {
       break;
     } else if (line.empty()) {
       continue;
     } else {
       UNREACHABLE();
       return;
     }
   }
 }
 
 void ProgramOptions::PrintHeader(std::ostream& stream) const {  // NOLINT
   stream << "---"
          << "\nwrap: " << BooleanToString(wrap_);
 
   if (!test_function_name_.empty()) {
     stream << "\ntest function name: " << test_function_name_;
   }
 
   if (module_) stream << "\nmodule: yes";
   if (top_level_) stream << "\ntop level: yes";
   if (do_expressions_) stream << "\ndo expressions: yes";
+  if (async_iteration_) stream << "\nasync iteration: yes";
 
   stream << "\n\n";
 }
 
 V8InitializationScope::V8InitializationScope(const char* exec_path)
     : platform_(v8::platform::CreateDefaultPlatform()) {
   i::FLAG_ignition = true;
   i::FLAG_always_opt = false;
   i::FLAG_allow_natives_syntax = true;
 
@@ skipping 84 matching lines @@
 
   BytecodeExpectationsPrinter printer(platform.isolate());
   printer.set_wrap(options.wrap());
   printer.set_module(options.module());
   printer.set_top_level(options.top_level());
   if (!options.test_function_name().empty()) {
     printer.set_test_function_name(options.test_function_name());
   }
 
   if (options.do_expressions()) i::FLAG_harmony_do_expressions = true;
+  if (options.async_iteration()) i::FLAG_harmony_async_iteration = true;
 
   stream << "#\n# Autogenerated by generate-bytecode-expectations.\n#\n\n";
   options.PrintHeader(stream);
   for (const std::string& snippet : snippet_list) {
     printer.PrintExpectation(stream, snippet);
   }
 
   i::FLAG_harmony_do_expressions = false;
+  i::FLAG_harmony_async_iteration = false;
 }
 
 bool WriteExpectationsFile(const std::vector<std::string>& snippet_list,
                            const V8InitializationScope& platform,
                            const ProgramOptions& options,
                            const std::string& output_filename) {
   std::ofstream output_file_handle;
   if (!options.write_to_stdout()) {
     output_file_handle.open(output_filename.c_str());
     if (!output_file_handle.is_open()) {
@@ skipping 24 matching lines @@
          "  --verbose Emit messages about the progress of the tool.\n"
          "  --raw-js  Read raw JavaScript, instead of the output format.\n"
          "  --stdin   Read from standard input instead of file.\n"
          "  --rebaseline  Rebaseline input snippet file.\n"
          "  --no-wrap     Do not wrap the snippet in a function.\n"
          "  --module      Compile as JavaScript module.\n"
          "  --test-function-name=foo  "
          "Specify the name of the test function.\n"
          "  --top-level   Process top level code, not the top-level function.\n"
          "  --do-expressions  Enable harmony_do_expressions flag.\n"
+         "  --async-iteration  Enable harmony_async_iteration flag.\n"
          "  --output=file.name\n"
          "      Specify the output file. If not specified, output goes to "
          "stdout.\n"
          "  --pool-type=(number|string|mixed)\n"
          "      Specify the type of the entries in the constant pool "
          "(default: mixed).\n"
          "\n"
          "When using --rebaseline, flags --no-wrap, --test-function-name \n"
          "and --pool-type will be overridden by the options specified in \n"
          "the input file header.\n\n"
@@ skipping 55 matching lines @@
     }
   }
 
   if (!options.rebaseline()) {
     if (!WriteExpectationsFile(snippet_list, platform, options,
                                options.output_filename())) {
       return 3;
     }
   }
 }