Extend API to allow setting length property for function templates.

src/objects.h

 // Copyright 2012 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 8546 matching lines @@
   DECL_ACCESSORS(parent_template, Object)
   DECL_ACCESSORS(named_property_handler, Object)
   DECL_ACCESSORS(indexed_property_handler, Object)
   DECL_ACCESSORS(instance_template, Object)
   DECL_ACCESSORS(class_name, Object)
   DECL_ACCESSORS(signature, Object)
   DECL_ACCESSORS(instance_call_handler, Object)
   DECL_ACCESSORS(access_check_info, Object)
   DECL_ACCESSORS(flag, Smi)
 
+  inline int length();
+  inline void set_length(int value);
+
   // Following properties use flag bits.
   DECL_BOOLEAN_ACCESSORS(hidden_prototype)
   DECL_BOOLEAN_ACCESSORS(undetectable)
   // If the bit is set, object instances created by this function
   // requires access check.
   DECL_BOOLEAN_ACCESSORS(needs_access_check)
   DECL_BOOLEAN_ACCESSORS(read_only_prototype)
 
   static inline FunctionTemplateInfo* cast(Object* obj);
 
@@ skipping 13 matching lines @@
   static const int kIndexedPropertyHandlerOffset =
       kNamedPropertyHandlerOffset + kPointerSize;
   static const int kInstanceTemplateOffset =
       kIndexedPropertyHandlerOffset + kPointerSize;
   static const int kClassNameOffset = kInstanceTemplateOffset + kPointerSize;
   static const int kSignatureOffset = kClassNameOffset + kPointerSize;
   static const int kInstanceCallHandlerOffset = kSignatureOffset + kPointerSize;
   static const int kAccessCheckInfoOffset =
       kInstanceCallHandlerOffset + kPointerSize;
   static const int kFlagOffset = kAccessCheckInfoOffset + kPointerSize;
-  static const int kSize = kFlagOffset + kPointerSize;
+  static const int kLengthOffset = kFlagOffset + kPointerSize;
+  static const int kSize = kLengthOffset + kPointerSize;
 
  private:
   // Bit position in the flag, from least significant bit position.
   static const int kHiddenPrototypeBit   = 0;
   static const int kUndetectableBit      = 1;
   static const int kNeedsAccessCheckBit  = 2;
   static const int kReadOnlyPrototypeBit = 3;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(FunctionTemplateInfo);
 };
@@ skipping 288 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_