[liveedit] fix stepping after replacing bytecode.

src/debug/liveedit.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/liveedit.h"
 
 #include "src/ast/scopeinfo.h"
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 1103 matching lines @@
     Handle<Code> old_code(shared_info->code());
     if (shared_info->HasBytecodeArray()) {
       // The old code is interpreted. If we clear the bytecode array, the
       // interpreter entry trampoline will self-heal and go to compiled code.
       shared_info->ClearBytecodeArray();
       shared_info->ReplaceCode(*new_code);
     } else {
       DCHECK(old_code->kind() == Code::FUNCTION);
       ReplaceCodeObject(old_code, new_code);
     }
+    if (shared_info->HasDebugInfo()) {
+      // Existing break points will be re-applied. Reset the debug info here.
+      isolate->debug()->RemoveDebugInfoAndClearFromShared(
+          handle(shared_info->GetDebugInfo()));
+    }
     Handle<Object> code_scope_info = compile_info_wrapper.GetCodeScopeInfo();
     if (code_scope_info->IsFixedArray()) {
       shared_info->set_scope_info(ScopeInfo::cast(*code_scope_info));
     }
     shared_info->DisableOptimization(kLiveEdit);
     // Update the type feedback vector, if needed.
     MaybeHandle<TypeFeedbackVector> feedback_vector =
         compile_info_wrapper.GetFeedbackVector();
     if (!feedback_vector.is_null()) {
       shared_info->set_feedback_vector(*feedback_vector.ToHandleChecked());
@@ skipping 679 matching lines @@
   const char* error_message =
       DropFrames(frames, top_frame_index, bottom_js_frame_index, &drop_mode);
 
   if (error_message != NULL) {
     return error_message;
   }
 
   // Adjust break_frame after some frames has been dropped.
   StackFrame::Id new_id = StackFrame::NO_ID;
   for (int i = bottom_js_frame_index + 1; i < frames.length(); i++) {
-    if (frames[i]->type() == StackFrame::JAVA_SCRIPT) {
+    if (frames[i]->type() == StackFrame::JAVA_SCRIPT ||
+        frames[i]->type() == StackFrame::INTERPRETED) {
       new_id = frames[i]->id();
       break;
     }
   }
   debug->FramesHaveBeenDropped(new_id, drop_mode);
   return NULL;
 }
 
 
 // Fills result array with statuses of functions. Modifies the stack
@@ skipping 224 matching lines @@
   }
 }
 
 
 bool LiveEditFunctionTracker::IsActive(Isolate* isolate) {
   return isolate->active_function_info_listener() != NULL;
 }
 
 }  // namespace internal
 }  // namespace v8