Do not add smis to the store buffer when cloning objects.

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 1282 matching lines @@
     UNREACHABLE();
   }
   NoGCScope no_gc;
   InitializeObject(address, cls_id, size);
   RawObject* raw_obj = reinterpret_cast<RawObject*>(address + kHeapObjectTag);
   ASSERT(cls_id == RawObject::ClassIdTag::decode(raw_obj->ptr()->tags_));
   return raw_obj;
 }
 
 
-class StoreBufferObjectPointerVisitor : public ObjectPointerVisitor {
+class StoreBufferUpdateVisitor : public ObjectPointerVisitor {
  public:
-  explicit StoreBufferObjectPointerVisitor(Isolate* isolate) :
-      ObjectPointerVisitor(isolate) {
-  }
+  explicit StoreBufferUpdateVisitor(Isolate* isolate) :
+      ObjectPointerVisitor(isolate) { }
+
   void VisitPointers(RawObject** first, RawObject** last) {
     for (RawObject** curr = first; curr <= last; ++curr) {
-      if ((*curr)->IsNewObject()) {
+      RawObject* raw_obj = *curr;
+      if (raw_obj->IsHeapObject() && raw_obj->IsNewObject()) {
         uword ptr = reinterpret_cast<uword>(curr);
         isolate()->store_buffer()->AddPointer(ptr);
       }
     }
   }
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(StoreBufferObjectPointerVisitor);
+  DISALLOW_COPY_AND_ASSIGN(StoreBufferUpdateVisitor);
 };
 
 
 bool Object::IsReadOnlyHandle() const {
   return Dart::IsReadOnlyHandle(reinterpret_cast<uword>(this));
 }
 
 
 bool Object::IsNotTemporaryScopedHandle() const {
   return (IsZoneHandle() || IsReadOnlyHandle());
 }
 
 
 
 RawObject* Object::Clone(const Object& src, Heap::Space space) {
   const Class& cls = Class::Handle(src.clazz());
   intptr_t size = src.raw()->Size();
   RawObject* raw_obj = Object::Allocate(cls.id(), size, space);
   NoGCScope no_gc;
   memmove(raw_obj->ptr(), src.raw()->ptr(), size);
   if (space == Heap::kOld) {
-    StoreBufferObjectPointerVisitor visitor(Isolate::Current());
+    StoreBufferUpdateVisitor visitor(Isolate::Current());
     raw_obj->VisitPointers(&visitor);
   }
   return raw_obj;
 }
 
 
 RawString* Class::Name() const {
   ASSERT(raw_ptr()->name_ != String::null());
   return raw_ptr()->name_;
 }
@@ skipping 11453 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart