Revert of [debugger] do not predict step in target for liveedit.

src/debug/debug.cc

 // Copyright 2012 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 "src/debug/debug.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 318 matching lines @@
   thread_local_.last_step_action_ = StepNone;
   thread_local_.last_statement_position_ = RelocInfo::kNoPosition;
   thread_local_.step_count_ = 0;
   thread_local_.last_fp_ = 0;
   thread_local_.queued_step_count_ = 0;
   thread_local_.step_out_fp_ = 0;
   thread_local_.step_in_enabled_ = false;
   // TODO(isolates): frames_are_dropped_?
   base::NoBarrier_Store(&thread_local_.current_debug_scope_,
                         static_cast<base::AtomicWord>(0));
+  thread_local_.restarter_frame_function_pointer_ = NULL;
 }
 
 
 char* Debug::ArchiveDebug(char* storage) {
   char* to = storage;
   MemCopy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal));
   ThreadInit();
   return storage + ArchiveSpacePerThread();
 }
 
@@ skipping 574 matching lines @@
       // Set target frame pointer.
       ActivateStepOut(frames_it.frame());
     } else {
       // Stepping out to the embedder. Disable step-in to avoid stepping into
       // the next (unrelated) call that the embedder makes.
       thread_local_.step_in_enabled_ = false;
     }
     return;
   }
 
+  STATIC_ASSERT(StepFrame > StepIn);
+  if (step_action >= StepIn) {
+    // If there's restarter frame on top of the stack, just get the pointer
+    // to function which is going to be restarted.
+    if (thread_local_.restarter_frame_function_pointer_ != NULL) {
+      Handle<JSFunction> restarted_function(
+          JSFunction::cast(*thread_local_.restarter_frame_function_pointer_));
+      FloodWithOneShot(restarted_function);
+    }
+  }
+
   // Fill the current function with one-shot break points even for step in on
   // a call target as the function called might be a native function for
   // which step in will not stop. It also prepares for stepping in
   // getters/setters.
   // If we are stepping into another frame, only fill calls and returns.
   FloodWithOneShot(function, step_action == StepFrame ? CALLS_AND_RETURNS
                                                       : ALL_BREAK_LOCATIONS);
 
   // Remember source position and frame to handle step next.
   thread_local_.last_statement_position_ =
@@ skipping 560 matching lines @@
   Address slot_pc = frame->pc() - Assembler::kDebugBreakSlotLength;
   int mask = RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT_AT_RETURN);
   for (RelocIterator it(*code, mask); !it.done(); it.next()) {
     if (it.rinfo()->pc() == slot_pc) return true;
   }
   return false;
 }
 
 
 void Debug::FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
-                                  LiveEdit::FrameDropMode mode) {
+                                  LiveEdit::FrameDropMode mode,
+                                  Object** restarter_frame_function_pointer) {
   if (mode != LiveEdit::CURRENTLY_SET_MODE) {
     thread_local_.frame_drop_mode_ = mode;
   }
   thread_local_.break_frame_id_ = new_break_frame_id;
+  thread_local_.restarter_frame_function_pointer_ =
+      restarter_frame_function_pointer;
 }
 
 
 bool Debug::IsDebugGlobal(JSGlobalObject* global) {
   return is_loaded() && global == debug_context()->global_object();
 }
 
 
 void Debug::ClearMirrorCache() {
   PostponeInterruptsScope postpone(isolate_);
@@ skipping 977 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8