Fix for bug 351257: type feedback vector initialization issue.

src/compiler.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 124 matching lines @@
   abort_due_to_dependency_ = false;
   if (script_->type()->value() == Script::TYPE_NATIVE) {
     MarkAsNative();
   }
   if (!shared_info_.is_null()) {
     ASSERT(language_mode() == CLASSIC_MODE);
     SetLanguageMode(shared_info_->language_mode());
   }
   set_bailout_reason(kUnknown);
 
-  if (!shared_info().is_null()) {
-    FixedArray* info_feedback_vector = shared_info()->feedback_vector();
-    if (info_feedback_vector->length() > 0) {
-      // We should initialize the CompilationInfo feedback vector from the
-      // passed in shared info, rather than creating a new one.
-      feedback_vector_ = Handle<FixedArray>(info_feedback_vector, isolate);
-    }
+  if (!shared_info().is_null() && shared_info()->is_compiled()) {
+    // We should initialize the CompilationInfo feedback vector from the
+    // passed in shared info, rather than creating a new one.
+    feedback_vector_ = Handle<FixedArray>(shared_info()->feedback_vector(),
+                                          isolate);
   }
 }
 
 
 CompilationInfo::~CompilationInfo() {
   delete deferred_handles_;
   delete no_frame_ranges_;
 #ifdef DEBUG
   // Check that no dependent maps have been added or added dependent maps have
   // been rolled back or committed.
@@ skipping 1169 matching lines @@
   AllowHandleDereference allow_deref;
   bool tracing_on = info()->IsStub()
       ? FLAG_trace_hydrogen_stubs
       : (FLAG_trace_hydrogen &&
          info()->closure()->PassesFilter(FLAG_trace_hydrogen_filter));
   return (tracing_on &&
       OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 } }  // namespace v8::internal