Support LiveEdit when standing on return operator

src/debug.cc

 // 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 971 matching lines @@
   } else if (thread_local_.frame_drop_mode_ ==
       FRAME_DROPPED_IN_DEBUG_SLOT_CALL) {
     // Debug break slot stub does not return normally, instead it manually
     // cleans the stack and jumps. We should patch the jump address.
     Code* plain_return = isolate_->builtins()->builtin(
         Builtins::kFrameDropper_LiveEdit);
     thread_local_.after_break_target_ = plain_return->entry();
   } else if (thread_local_.frame_drop_mode_ ==
       FRAME_DROPPED_IN_DIRECT_CALL) {
     // Nothing to do, after_break_target is not used here.
+  } else if (thread_local_.frame_drop_mode_ ==
+      FRAME_DROPPED_IN_RETURN_CALL) {
+    Code* plain_return = isolate_->builtins()->builtin(
+        Builtins::kFrameDropper_LiveEdit);
+    thread_local_.after_break_target_ = plain_return->entry();
   } else {
     UNREACHABLE();
   }
 
   return heap->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Object*, Debug_Break) {
   return isolate->debug()->Break(args);
@@ skipping 2148 matching lines @@
     {
       Locker locker;
       Isolate::Current()->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal