[Interpreter] Support relevant FLAG_s in generate-bytecode-expectations.

FLAG_legacy_const and FLAG_harmony_do_expressions can now be toggled
both through the command line and through the option header.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1716793002

Cr-Commit-Position: refs/heads/master@{#34160}

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

@@ -32,6 +32,8 @@ class ProgramOptions final {
         wrap_(true),
         execute_(true),
         top_level_(false),
+        legacy_const_(false),
+        do_expressions_(false),
         const_pool_type_(
             BytecodeExpectationsPrinter::ConstantPoolType::kMixed) {}
 
@@ -50,6 +52,8 @@ class ProgramOptions final {
   bool wrap() const { return wrap_; }
   bool execute() const { return execute_; }
   bool top_level() const { return top_level_; }
+  bool legacy_const() const { return legacy_const_; }
+  bool do_expressions() const { return do_expressions_; }
   BytecodeExpectationsPrinter::ConstantPoolType const_pool_type() const {
     return const_pool_type_;
   }
@@ -66,6 +70,8 @@ class ProgramOptions final {
   bool wrap_;
   bool execute_;
   bool top_level_;
+  bool legacy_const_;
+  bool do_expressions_;
   BytecodeExpectationsPrinter::ConstantPoolType const_pool_type_;
   std::string input_filename_;
   std::string output_filename_;
@@ -159,6 +165,10 @@ ProgramOptions ProgramOptions::FromCommandLine(int argc, char** argv) {
       options.execute_ = false;
     } else if (strcmp(argv[i], "--top-level") == 0) {
       options.top_level_ = true;
+    } else if (strcmp(argv[i], "--legacy-const") == 0) {
+      options.legacy_const_ = true;
+    } else if (strcmp(argv[i], "--do-expressions") == 0) {
+      options.do_expressions_ = 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) {
@@ -233,6 +243,10 @@ void ProgramOptions::UpdateFromHeader(std::istream& stream) {
       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, 14, "legacy const: ") == 0) {
+      legacy_const_ = ParseBoolean(line.c_str() + 14);
+    } else if (line.compare(0, 16, "do expressions: ") == 0) {
+      do_expressions_ = ParseBoolean(line.c_str() + 16);
     } else if (line == "---") {
       break;
     } else if (line.empty()) {
@@ -256,6 +270,8 @@ void ProgramOptions::PrintHeader(std::ostream& stream) const {  // NOLINT
   }
 
   if (top_level_) stream << "\ntop level: yes";
+  if (legacy_const_) stream << "\nlegacy const: yes";
+  if (do_expressions_) stream << "\ndo expressions: yes";
 
   stream << "\n\n";
 }
@@ -362,6 +378,9 @@ void GenerateExpectationsFile(std::ostream& stream,  // NOLINT
       printer.set_test_function_name(options.test_function_name());
     }
 
+    if (options.legacy_const()) i::FLAG_legacy_const = true;
+    if (options.do_expressions()) i::FLAG_harmony_do_expressions = true;
+
     stream << "#\n# Autogenerated by generate-bytecode-expectations\n#\n\n";
     options.PrintHeader(stream);
     for (const std::string& snippet : snippet_list) {
@@ -384,6 +403,8 @@ void PrintUsage(const char* exec_path) {
          "  --test-function-name=foo  "
          "Specify the name of the test function.\n"
          "  --top-level   Process top level code, not the top-level function."
+         "  --legacy-const  Enable legacy_const flag.\n"
+         "  --do-expressions  Enable harmony_do_expressions flag.\n"
          "  --output=file.name\n"
          "      Specify the output file. If not specified, output goes to "
          "stdout.\n"