Multi level virtual function tables
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United States of America Patent
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Nov 6, 2012
Grant Date -
Jul 15, 2010
app pub date -
Jan 14, 2009
filing date -
Jan 14, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A multi level virtual function table uses a hierarchy of chunks or segments of virtual function tables to identify methods for a particular class. At least one level of indirection pointers may point to individual virtual function table chunks, which may be shared by multiple classes. In some embodiments, fixed size chunks of virtual function tables may be used, other embodiments may use variable sized chunks of virtual function tables. In just in time compiled code, virtual function tables may be limited to sharing across parent and child classes, while in pre-compiled code, more complex sharing may be used.
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