Microsoft Technology Licensing, LLC

David Jerome Hiniker

Frank V Peschel-Gallee

Jan Kotas

Surupa Biswas

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.

Multi level virtual function tables

Routines which are likely to be good candidates for cross-module inlining are automatically identified according to criteria based on service history, compiler inlining criteria, and/or execution performance criteria. Candidates can also be automatically identified by pattern matching codes of routines which satisfy service history, execution performance, and/or compiler criteria. Automatically identified candidate routines are presented in an inlining advisory tool, allowing developers to approve/veto automatically identified candidates, to add other routines, and to either suggest or require that the development tools perform cross-module inlining with particular routines. Changes to a candidate routine can trigger regeneration of native image(s) into which the routine has been compiled.

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David Jerome Hiniker