Introduce number type information in the virtual frame.

src/frame-element.cc

 // Copyright 2009 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 17 matching lines @@
 #include "v8.h"
 
 #include "frame-element.h"
 
 namespace v8 {
 namespace internal {
 
 // -------------------------------------------------------------------------
 // FrameElement implementation.
 
+NumberInfo::Type FrameElement::number_info() {
+  // Copied elements do not have number info. Instead
+  // we have to inspect their backing element in the frame.
+  ASSERT(!is_copy());
+  if (!is_constant()) return NumberInfoField::decode(value_);
+  Handle<Object> value = handle();
+  if (value->IsSmi()) return NumberInfo::kSmi;
+  if (value->IsHeapNumber()) return NumberInfo::kHeapNumber;
+  return NumberInfo::kUnknown;
+}
+
 
 FrameElement::ZoneObjectList* FrameElement::ConstantList() {
   static ZoneObjectList list(10);
   return &list;
 }
 
 
 } }  // namespace v8::internal