Move template instance check from Object to FunctionTemplateInfo::IsTemplateFor

src/objects.cc

 // Copyright 2013 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 185 matching lines @@
     double num = HeapNumber::cast(this)->value();
     if (num >= 0 && FastUI2D(FastD2UI(num)) == num) {
       *value = FastD2UI(num);
       return true;
     }
   }
   return false;
 }
 
 
+bool FunctionTemplateInfo::IsTemplateFor(Object* object) {
+  if (!object->IsHeapObject()) return false;
+  return IsTemplateFor(HeapObject::cast(object)->map());
+}
+
+
+bool FunctionTemplateInfo::IsTemplateFor(Map* map) {
+  // There is a constraint on the object; check.
+  if (!map->IsJSObjectMap()) return false;
+  // Fetch the constructor function of the object.
+  Object* cons_obj = map->constructor();
+  if (!cons_obj->IsJSFunction()) return false;
+  JSFunction* fun = JSFunction::cast(cons_obj);
+  // Iterate through the chain of inheriting function templates to
+  // see if the required one occurs.
+  for (Object* type = fun->shared()->function_data();
+       type->IsFunctionTemplateInfo();
+       type = FunctionTemplateInfo::cast(type)->parent_template()) {
+    if (type == this) return true;
+  }
+  // Didn't find the required type in the inheritance chain.
+  return false;
+}
+
+
 template<typename To>
 static inline To* CheckedCast(void *from) {
   uintptr_t temp = reinterpret_cast<uintptr_t>(from);
   ASSERT(temp % sizeof(To) == 0);
   return reinterpret_cast<To*>(temp);
 }
 
 
 static MaybeObject* PerformCompare(const BitmaskCompareDescriptor& descriptor,
                                    char* ptr,
@@ skipping 16432 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal