Fix redefining of attributes on aliased arguments.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 7d8dae78aa910de0c9561c08786abef380f1f9fc..898e0a28ac3172350db3c27b86f753f201516dc3 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -440,7 +440,8 @@ const int kVariableSizeSentinel = 0;
   V(SCRIPT, Script, script)                                                    \
   V(CODE_CACHE, CodeCache, code_cache)                                         \
   V(POLYMORPHIC_CODE_CACHE, PolymorphicCodeCache, polymorphic_code_cache)      \
-  V(TYPE_FEEDBACK_INFO, TypeFeedbackInfo, type_feedback_info)
+  V(TYPE_FEEDBACK_INFO, TypeFeedbackInfo, type_feedback_info)                  \
+  V(ALIASED_ARGUMENTS_ENTRY, AliasedArgumentsEntry, aliased_arguments_entry)
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 #define STRUCT_LIST_DEBUGGER(V)                                                \
@@ -596,6 +597,7 @@ enum InstanceType {
   CODE_CACHE_TYPE,
   POLYMORPHIC_CODE_CACHE_TYPE,
   TYPE_FEEDBACK_INFO_TYPE,
+  ALIASED_ARGUMENTS_ENTRY_TYPE,
   // The following two instance types are only used when ENABLE_DEBUGGER_SUPPORT
   // is defined. However as include/v8.h contain some of the instance type
   // constants always having them avoids them getting different numbers
@@ -6435,6 +6437,31 @@ class TypeFeedbackInfo: public Struct {
 };
 
 
+class AliasedArgumentsEntry: public Struct {

[rossberg, 2012/02/24 13:51:05]

Maybe add a comment explaining the role of this type.

[Michael Starzinger, 2012/02/24 14:36:41]

Done.

+ public:
+  inline int aliased_context_slot();
+  inline void set_aliased_context_slot(int count);
+
+  static inline AliasedArgumentsEntry* cast(Object* obj);
+
+#ifdef OBJECT_PRINT
+  inline void AliasedArgumentsEntryPrint() {
+    AliasedArgumentsEntryPrint(stdout);
+  }
+  void AliasedArgumentsEntryPrint(FILE* out);
+#endif
+#ifdef DEBUG
+  void AliasedArgumentsEntryVerify();
+#endif
+
+  static const int kAliasedContextSlot = HeapObject::kHeaderSize;
+  static const int kSize = kAliasedContextSlot + kPointerSize;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(AliasedArgumentsEntry);
+};
+
+
 enum AllowNullsFlag {ALLOW_NULLS, DISALLOW_NULLS};
 enum RobustnessFlag {ROBUST_STRING_TRAVERSAL, FAST_STRING_TRAVERSAL};