First take on custom call generators.

src/stub-cache.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 530 matching lines @@
                             Map* transition,
                             String* name);
 
  private:
   Object* GetCode(PropertyType type, String* name);
 };
 
 
 class CallStubCompiler: public StubCompiler {
  public:
-  explicit CallStubCompiler(int argc, InLoopFlag in_loop)
+  CallStubCompiler(int argc, InLoopFlag in_loop)
       : arguments_(argc), in_loop_(in_loop) { }
 
   Object* CompileCallField(JSObject* object,
                            JSObject* holder,
                            int index,
                            String* name);
   Object* CompileCallConstant(Object* object,
                               JSObject* holder,
                               JSFunction* function,
                               String* name,
                               CheckType check);
   Object* CompileCallInterceptor(JSObject* object,
                                  JSObject* holder,
                                  String* name);
   Object* CompileCallGlobal(JSObject* object,
                             GlobalObject* holder,
                             JSGlobalPropertyCell* cell,
                             JSFunction* function,
                             String* name);
 
+  Object* CompileArrayPushCall(Object* object,
+                               JSObject* holder,
+                               JSFunction* function,
+                               String* name,
+                               CheckType check);
+
  private:
   const ParameterCount arguments_;
   const InLoopFlag in_loop_;
 
   const ParameterCount& arguments() { return arguments_; }
 
   Object* GetCode(PropertyType type, String* name);
 };
 
 
 class ConstructStubCompiler: public StubCompiler {
  public:
   explicit ConstructStubCompiler() {}
 
   Object* CompileConstructStub(SharedFunctionInfo* shared);
 
  private:
   Object* GetCode();
 };
 
 
+typedef Object* (*CustomCallGenerator)(CallStubCompiler* compiler,
+                                       Object* object,
+                                       JSObject* holder,
+                                       JSFunction* function,
+                                       String* name,
+                                       StubCompiler::CheckType check);
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_