Allow functions to have custom construct stubs that are called...

src/builtins.h

 // Copyright 2006-2008 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 33 matching lines @@
                                                    \
   V(HandleApiCall)                                 \
   V(HandleApiCallAsFunction)                       \
   V(HandleApiCallAsConstructor)
 
 
 // Define list of builtins implemented in assembly.
 #define BUILTIN_LIST_A(V)                                      \
   V(ArgumentsAdaptorTrampoline, BUILTIN, UNINITIALIZED)        \
   V(JSConstructCall,            BUILTIN, UNINITIALIZED)        \
+  V(JSConstructStubGeneric,     BUILTIN, UNINITIALIZED)        \
   V(JSEntryTrampoline,          BUILTIN, UNINITIALIZED)        \
   V(JSConstructEntryTrampoline, BUILTIN, UNINITIALIZED)        \
                                                                \
   V(LoadIC_Miss,                BUILTIN, UNINITIALIZED)        \
   V(KeyedLoadIC_Miss,           BUILTIN, UNINITIALIZED)        \
   V(StoreIC_Miss,               BUILTIN, UNINITIALIZED)        \
   V(KeyedStoreIC_Miss,          BUILTIN, UNINITIALIZED)        \
                                                                \
   V(StoreIC_ExtendStorage,      BUILTIN, UNINITIALIZED)        \
   V(KeyedStoreIC_ExtendStorage, BUILTIN, UNINITIALIZED)        \
@@ skipping 139 matching lines @@
   // Note: These are always Code objects, but to conform with
   // IterateBuiltins() above which assumes Object**'s for the callback
   // function f, we use an Object* array here.
   static Object* builtins_[builtin_count];
   static const char* names_[builtin_count];
   static const char* javascript_names_[id_count];
   static int javascript_argc_[id_count];
 
   static void Generate_Adaptor(MacroAssembler* masm, CFunctionId id);
   static void Generate_JSConstructCall(MacroAssembler* masm);
+  static void Generate_JSConstructStubGeneric(MacroAssembler* masm);
   static void Generate_JSEntryTrampoline(MacroAssembler* masm);
   static void Generate_JSConstructEntryTrampoline(MacroAssembler* masm);
   static void Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm);
 
   static void Generate_FunctionCall(MacroAssembler* masm);
   static void Generate_FunctionApply(MacroAssembler* masm);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_BUILTINS_H_