Correctly support several consecutive stack modifications.

src/liveedit.cc

 // Copyright 2012 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 1450 matching lines @@
     frame_has_padding = Debug::FramePaddingLayout::kIsSupported;
   } else if (pre_top_frame_code ==
              isolate->debug()->debug_break_slot()) {
     // OK, we can drop debug break slot.
     *mode = Debug::FRAME_DROPPED_IN_DEBUG_SLOT_CALL;
     frame_has_padding = Debug::FramePaddingLayout::kIsSupported;
   } else if (pre_top_frame_code ==
       isolate->builtins()->builtin(
           Builtins::kFrameDropper_LiveEdit)) {
     // OK, we can drop our own code.
-    *mode = Debug::FRAME_DROPPED_IN_DIRECT_CALL;
+    pre_top_frame = frames[top_frame_index - 2];
+    top_frame = frames[top_frame_index - 1];
+    *mode = Debug::CURRENTLY_SET_MODE;
     frame_has_padding = false;
   } else if (pre_top_frame_code ==
       isolate->builtins()->builtin(Builtins::kReturn_DebugBreak)) {
     *mode = Debug::FRAME_DROPPED_IN_RETURN_CALL;
     frame_has_padding = Debug::FramePaddingLayout::kIsSupported;
   } else if (pre_top_frame_code->kind() == Code::STUB &&
       pre_top_frame_code->major_key() == CodeStub::CEntry) {
     // Entry from our unit tests on 'debugger' statement.
     // It's fine, we support this case.
     *mode = Debug::FRAME_DROPPED_IN_DIRECT_CALL;
     // We don't have a padding from 'debugger' statement call.
     // Here the stub is CEntry, it's not debug-only and can't be padded.
     // If anyone would complain, a proxy padded stub could be added.
     frame_has_padding = false;
+  } else if (pre_top_frame->type() == StackFrame::ARGUMENTS_ADAPTOR) {
+    // This must be adaptor that remain from the frame dropping that
+    // is still on stack. A frame dropper frame must be above it.
+    ASSERT(frames[top_frame_index - 2]->LookupCode() ==
+        isolate->builtins()->builtin(Builtins::kFrameDropper_LiveEdit));
+    pre_top_frame = frames[top_frame_index - 3];
+    top_frame = frames[top_frame_index - 2];
+    *mode = Debug::CURRENTLY_SET_MODE;
+    frame_has_padding = false;
   } else {
     return "Unknown structure of stack above changing function";
   }
 
   Address unused_stack_top = top_frame->sp();
   Address unused_stack_bottom = bottom_js_frame->fp()
       - Debug::kFrameDropperFrameSize * kPointerSize  // Size of the new frame.
       + kPointerSize;  // Bigger address end is exclusive.
 
   Address* top_frame_pc_address = top_frame->pc_address();
@@ skipping 372 matching lines @@
 
 bool LiveEditFunctionTracker::IsActive(Isolate* isolate) {
   return false;
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 
 } }  // namespace v8::internal