Handle thread preemption in debugger

src/top.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 164 matching lines @@
   static Address handler(ThreadLocalTop* thread) { return thread->handler_; }
 
   static inline Address* c_entry_fp_address() {
     return &thread_local_.c_entry_fp_;
   }
   static inline Address* handler_address() { return &thread_local_.handler_; }
 
   // Generated code scratch locations.
   static void* formal_count_address() { return &thread_local_.formal_count_; }
 
-  static void new_break(StackFrame::Id break_frame_id);
-  static void set_break(StackFrame::Id break_frame_id, int break_id);
-  static bool check_break(int break_id);
-  static bool is_break();
-  static StackFrame::Id break_frame_id();
-  static int break_id();
-
   static void MarkCompactPrologue(bool is_compacting);
   static void MarkCompactEpilogue(bool is_compacting);
   static void MarkCompactPrologue(bool is_compacting,
                                   char* archived_thread_data);
   static void MarkCompactEpilogue(bool is_compacting,
                                   char* archived_thread_data);
   static void PrintCurrentStackTrace(FILE* out);
   static void PrintStackTrace(FILE* out, char* thread_data);
   static void PrintStack(StringStream* accumulator);
   static void PrintStack();
@@ skipping 95 matching lines @@
   static void PrintStackTrace(FILE* out, ThreadLocalTop* thread);
   static void MarkCompactPrologue(bool is_compacting,
                                   ThreadLocalTop* archived_thread_data);
   static void MarkCompactEpilogue(bool is_compacting,
                                   ThreadLocalTop* archived_thread_data);
 
   // Debug.
   // Mutex for serializing access to break control structures.
   static Mutex* break_access_;
 
-  // ID of the frame where execution is stopped by debugger.
-  static StackFrame::Id break_frame_id_;
-
-  // Counter to create unique id for each debug break.
-  static int break_count_;
-
-  // Current debug break, 0 if running.
-  static int break_id_;
-
   friend class SaveContext;
   friend class AssertNoContextChange;
   friend class ExecutionAccess;
 
   static void FillCache();
 };
 
 
 // If the GCC version is 4.1.x or 4.2.x an additional field is added to the
 // class as a work around for a bug in the generated code found with these
 // versions of GCC. See V8 issue 122 for details.
 class SaveContext BASE_EMBEDDED {
  public:
-  SaveContext() :
-      context_(Top::context()),
+  SaveContext()
+      : context_(Top::context()),
 #if __GNUC_VERSION__ >= 40100 && __GNUC_VERSION__ < 40300
-      dummy_(Top::context()),
+        dummy_(Top::context()),
 #endif
-      prev_(Top::save_context()) {
+        prev_(Top::save_context()) {
     Top::set_save_context(this);
 
     // If there is no JS frame under the current C frame, use the value 0.
     JavaScriptFrameIterator it;
     js_sp_ = it.done() ? 0 : it.frame()->sp();
   }
 
   ~SaveContext() {
     Top::set_context(*context_);
     Top::set_save_context(prev_);
@@ skipping 40 matching lines @@
 
 class ExecutionAccess BASE_EMBEDDED {
  public:
   ExecutionAccess();
   ~ExecutionAccess();
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TOP_H_