Method for generating an object data structure layout for a clas

Details Method for generating an object data structure layout for a clas Method for generating an object data structure layout for a clas

1993-12-07

1995-04-25

Kriess, Kevin A.

Boots, shoes, and leggings

364DIG1, 3642281, 364280, 364284, G06F 1200

Patent

active

054107059

ABSTRACT:
A method for a computer compiler for an object-oriented programming language for implementing virtual functions and virtual base classes is provided. In preferred embodiments of the present invention, the data structure layout of an object includes a virtual function table pointer, a virtual base table pointer, occurrences of each non-virtual base class, the data members of the class, and occurrences of each virtual base class. If a class introduces a virtual function member and the class has a non-virtual base class with a virtual function table pointer, then the class shares the virtual function table pointer of the non-virtual base class that is first visited in a depth-first, left-to-right traversal of the inheritance tree. In preferred embodiments of the present invention, each instance of a given class shares a set of virtual function tables and virtual base tables for that class. In preferred embodiments, adjusters are used when a function member in a derived class overrides a function member that is defined in more than one base class, and when a derived class has a base class that overrides a function member in a virtual base class of that class and the derived class itself does not override the function member.

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Turbo C++ Programmers Guide, Borland International, 1990, pp. 102-130.
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Ellis, Margaret and Bjarne Stroustrup, The Annotated C++ Reference Manual, Addison-Wesley Publishing Company, New York, 1990, Ch. 10, "Derived Classics," pp. 228-237.

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