ported --isolate option to d8 and refactored to group together option parsing

src/d8.h

Index: src/d8.h
diff --git a/src/d8.h b/src/d8.h
index e22546999325a34a52aa002c05e473a852e5f100..7f0272710b4b160f9b1a5a90ea4f4b5e8309cc65 100644
--- a/src/d8.h
+++ b/src/d8.h
@@ -112,6 +112,87 @@ class CounterMap {
 };
 
 
+class SourceGroup {
+ public:
+  SourceGroup()
+      : next_semaphore_(v8::internal::OS::CreateSemaphore(0)),
+        done_semaphore_(v8::internal::OS::CreateSemaphore(0)),
+        thread_(NULL),
+        argv_(NULL),
+        begin_offset_(0),
+        end_offset_(0) { }
+
+  void Begin(char** argv, int offset) {
+    argv_ = const_cast<const char**>(argv);
+    begin_offset_ = offset;
+  }
+
+  void End(int offset) { end_offset_ = offset; }
+
+  void Execute();
+
+  void StartExecuteInThread();
+  void WaitForThread();
+
+ private:
+  class IsolateThread : public i::Thread {
+   public:
+    explicit IsolateThread(SourceGroup* group)
+        : i::Thread(GetThreadOptions()), group_(group) {}
+
+    virtual void Run() {
+      group_->ExecuteInThread();
+    }
+
+   private:
+    SourceGroup* group_;
+  };
+
+  static i::Thread::Options GetThreadOptions();
+  void ExecuteInThread();
+
+  i::Semaphore* next_semaphore_;
+  i::Semaphore* done_semaphore_;
+  i::Thread* thread_;
+
+  void ExitShell(int exit_code);
+  Handle<String> ReadFile(const char* name);
+
+  const char** argv_;
+  int begin_offset_;
+  int end_offset_;
+};
+
+
+class ShellOptions {
+ public:
+  ShellOptions()
+     : script_executed(false),
+       last_run(true),
+       stress_opt(false),
+       stress_deopt(false),
+       interactive_shell(false),
+       test_shell(false),
+       use_preemption(true),
+       preemption_interval(10),
+       num_isolates(1),
+       isolate_sources(NULL),
+       parallel_files(NULL) { }
+
+  bool script_executed;
+  bool last_run;
+  bool stress_opt;
+  bool stress_deopt;
+  bool interactive_shell;
+  bool test_shell;
+  bool use_preemption;
+  int preemption_interval;
+  int num_isolates;
+  SourceGroup* isolate_sources;
+  i::List< i::Vector<const char> >* parallel_files;
+};
+
+
 class Shell: public i::AllStatic {
  public:
   static bool ExecuteString(Handle<String> source,
@@ -129,12 +210,13 @@ class Shell: public i::AllStatic {
   static void AddHistogramSample(void* histogram, int sample);
   static void MapCounters(const char* name);
   static Handle<String> ReadFile(const char* name);
-  static void Initialize(bool test_shell);
-  static void RenewEvaluationContext();
+  static void Initialize();
+  static Persistent<Context> CreateEvaluationContext();
   static void InstallUtilityScript();
   static void RunShell();
+  static bool SetOptions(int argc, char* argv[]);
   static int RunScript(char* filename);
-  static int RunMain(int argc, char* argv[], bool* executed);
+  static int RunMain(int argc, char* argv[]);
   static int Main(int argc, char* argv[]);
   static Handle<ObjectTemplate> CreateGlobalTemplate();
   static Handle<Array> GetCompletions(Handle<String> text,
@@ -205,6 +287,8 @@ class Shell: public i::AllStatic {
   static const char* kHistoryFileName;
   static const char* kPrompt;
 
+  static ShellOptions options;
+
  private:
   static Persistent<Context> utility_context_;
   static Persistent<Context> evaluation_context_;
@@ -214,6 +298,7 @@ class Shell: public i::AllStatic {
   static CounterCollection local_counters_;
   static CounterCollection* counters_;
   static i::OS::MemoryMappedFile* counters_file_;
+  static i::Mutex* context_mutex_;
   static Counter* GetCounter(const char* name, bool is_histogram);
   static Handle<Value> CreateExternalArray(const Arguments& args,
                                            ExternalArrayType type,