Handle thread preemption in debugger

src/top.cc

Index: src/top.cc
===================================================================
--- src/top.cc	(revision 1435)
+++ src/top.cc	(working copy)
@@ -38,9 +38,6 @@
 
 ThreadLocalTop Top::thread_local_;
 Mutex* Top::break_access_ = OS::CreateMutex();
-StackFrame::Id Top::break_frame_id_;
-int Top::break_count_;
-int Top::break_id_;
 
 NoAllocationStringAllocator* preallocated_message_space = NULL;
 
@@ -222,10 +219,6 @@
 
   InitializeThreadLocal();
 
-  break_frame_id_ = StackFrame::NO_ID;
-  break_count_ = 0;
-  break_id_ = 0;
-
   // Only preallocate on the first initialization.
   if (FLAG_preallocate_message_memory && (preallocated_message_space == NULL)) {
     // Start the thread which will set aside some memory.
@@ -295,44 +288,6 @@
 }
 
 
-void Top::new_break(StackFrame::Id break_frame_id) {
-  ExecutionAccess access;
-  break_frame_id_ = break_frame_id;
-  break_id_ = ++break_count_;
-}
-
-
-void Top::set_break(StackFrame::Id break_frame_id, int break_id) {
-  ExecutionAccess access;
-  break_frame_id_ = break_frame_id;
-  break_id_ = break_id;
-}
-
-
-bool Top::check_break(int break_id) {
-  ExecutionAccess access;
-  return break_id == break_id_;
-}
-
-
-bool Top::is_break() {
-  ExecutionAccess access;
-  return break_id_ != 0;
-}
-
-
-StackFrame::Id Top::break_frame_id() {
-  ExecutionAccess access;
-  return break_frame_id_;
-}
-
-
-int Top::break_id() {
-  ExecutionAccess access;
-  return break_id_;
-}
-
-
 void Top::MarkCompactPrologue(bool is_compacting) {
   MarkCompactPrologue(is_compacting, &thread_local_);
 }