Request for comments on overall approach.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 609eed90cb5c91cc784c2650a4bdf1c02bac0790..b892d0de1f6094e12bc1899200830b3ce4fde92f 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -200,7 +200,6 @@ class Object {
   }
 
   inline RawClass* clazz() const;
-  static intptr_t class_offset() { return OFFSET_OF(RawObject, class_); }
   static intptr_t tags_offset() { return OFFSET_OF(RawObject, tags_); }
 
   // Class testers.
@@ -710,6 +709,10 @@ class Class : public Object {
   // otherwise a new object is allocated and returned.
   static RawClass* GetClass(ObjectKind kind);
 
+  void ForceSetRaw(RawClass* raw) {
+    raw_ = raw;
+  }
+
  private:
   void set_name(const String& value) const;
   void set_script(const Script& value) const;
@@ -2251,6 +2254,9 @@ class Code : public Object {
   static RawCode* FinalizeCode(const Function& function, Assembler* assembler);
   static RawCode* FinalizeCode(const char* name, Assembler* assembler);
   static RawCode* LookupCode(uword pc);
+#ifdef DEBUG
+  static void FindAndPrint(uword pc);
+#endif
 
   int32_t GetPointerOffsetAt(int index) const {
     return *PointerOffsetAddrAt(index);
@@ -4877,12 +4883,8 @@ RawClass* Object::clazz() const {
   if ((raw_value & kSmiTagMask) == kSmiTag) {
     return Smi::Class();
   }
-  RawClass* result = raw_->ptr()->class_;
-  ASSERT(result->ptr()->index_ ==
-      RawObject::ClassTag::decode(raw_->ptr()->tags_));
-  ASSERT(Isolate::Current()->class_table()->At(
-      RawObject::ClassTag::decode(raw_->ptr()->tags_)) == result);
-  return result;
+
+  return raw_->GetClass();

[Ivan Posva, 2012/05/26 04:34:46]

Please no functionality on RawObjects.

[Vyacheslav Egorov (Google), 2012/05/26 16:48:22]

ok. There is RawObject::Size so I assumed that RawObject::GetClass would be also
fine. 

will fix.

 }
 
 
@@ -4902,7 +4904,7 @@ void Object::SetRaw(RawObject* value) {
          vm_isolate_heap->Contains(reinterpret_cast<uword>(raw_->ptr())));
 #endif
   set_vtable((raw_ == null_) ?
-             handle_vtable_ : raw_->ptr()->class_->ptr()->handle_vtable_);
+             handle_vtable_ : raw_->GetClass()->ptr()->handle_vtable_);
 }