System and method for creating composite classes for objects having virtual functions for avoidance of user mode/kernel mode transitions

A memory media which stores a software program which enables access to an object in both first and second modes with reduced mode transitions, wherein the object is of a class A, wherein the software program comprises program instructions which are executable to perform:

• defining the class A, wherein the class A includes one or more virtual functions and a virtual function table pointer, where the class A defines a second mode vector table pointer in the first mode;
• defining an empty class, wherein the empty class includes a virtual function, wherein the empty class includes a virtual function table pointer;
• defining a composite class of the class A, wherein the composite class inherits from the class A and the empty class;
• instantiating a composite object from the composite class in one or more of the first mode or the second mode;
• wherein, if the composite object is instantiated in the second mode, the program instructions are executable to perform:
• changing the virtual function table pointer for the empty class in the composite object to the first mode virtual function table pointer for class A;
• wherein, if the composite object is instantiated in the first mode, the program instructions are executable to perform:
• storing the second mode virtual function table pointer for class A in the second mode vector table pointer;
• wherein the composite object can be shared directly between first and second modes with reduced mode transitions.

A method for enabling access to an object in both user and kernel modes with reduced user mode/kernel mode transitions, wherein the object is of a class A, the method comprising:

• defining the class A, wherein the class A includes one or more virtual functions and a virtual function table pointer, wherein the class A defines a kernel mode vector table pointer in user mode;
• defining an empty class, wherein the empty class includes a virtual function, wherein the empty class includes a virtual function table pointer;
• defining a composite class of the class A, wherein the composite class inherits from the class A and the empty class;
• instantiating a composite object from the composite class in one or more of the user mode or the kernel mode;
• wherein, if the composite object is instantiated in kernel mode, the method comprises:
• changing the virtual function table pointer for the empty class in the composite object to the user mode virtual function table pointer for class A;
• wherein, if the composite object is instantiated in user mode, the method comprises:
• storing the kernel mode virtual function table pointer for class A in the kernel mode vector table pointer;
• wherein the composite object can be shared directly between user and kernel modes with reduced user mode/kernel mode transitions.

A method for enabling access to an object in both user and kernel modes with reduced user mode/kernel mode transitions, wherein the object is of a class A, the method comprising:

• defining the class A, wherein the class A includes one or more virtual functions and a virtual function table pointer, wherein the class A defines a user mode vector table pointer in kernel mode;
• defining an empty class, wherein the empty class includes a virtual function, wherein the empty class includes a virtual function table pointer;
• defining a composite class of the class A, wherein the composite class inherits from the class A and the empty class;
• instantiating a composite object from the composite class in one or more of the user mode or the kernel mode;
• wherein, if the composite object is instantiated in user mode, the method comprises:
• changing the virtual function table pointer for the empty class in the composite object to the kernel mode virtual function table pointer for class A;
• wherein, if the composite object is instantiated in kernel mode, the method comprises:
• storing the user mode virtual function table pointer for class A in the user mode vector table pointer;
• wherein the composite object can be shared directly between user and kernel modes with reduced user mode/kernel mode transitions.

A method for enabling access to an object in both first and second modes with reduced mode transitions, wherein the object is of a class A, the method comprising:

• defining the class A, wherein the class A includes one or more virtual functions and a virtual function table pointer, wherein the class A defines a second mode vector table pointer in the first mode;
• defining an empty class, wherein the empty class includes a virtual function, wherein the empty class includes a virtual function table pointer;
• defining a composite class of the class A, wherein the composite class inherits from the class A and the empty class;
• instantiating a composite object from the composite class in one or more of the first mode or the second mode;
• modifying the composite object to create a modified composite object, wherein said modified composite object can be shared directly between first and second modes with reduced mode transitions.