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Patent Title: Method and computer program product for implementing method calls in a computer system

Assignee: IBM
Patent Number: US6175956
Issue Date: 01-16-2001
Application Number:
File Date:07-15-1998

Abstract: A computer implemented method and computer program compiler product are provided for implementing method calls in a computer system. Virtual method calls are identified in an intermediate instruction stream representation. Responsive to an identified virtual method call, profile data for the identified call site are read. A most frequently called procedure for the identified call site is compared with a first threshold value. Responsive to the most frequently called procedure being called less than the first threshold value, the virtual method call is maintained in a revised instruction stream representation. Responsive to the most frequently called procedure being called greater than or equal to the first threshold value, a guarded call to the most frequently called procedure is inserted at the identified call site in the revised instruction stream representation. In accordance with features of the invention, checking whether one object type accounts for more than a second threshold value of the calls to the most frequently called procedure at the identified call site is performed. Responsive to one object type accounting for more than or equal to the second threshold value, a type guard and a call to the most frequently called procedure are inserted at the identified call site in the revised instruction stream representation. Responsive to one object type accounting for less than the second threshold value, an address guard and a call to the most frequently called procedure are inserted at the identified call site in the revised instruction stream representation.

Notes:

Link to USPTO

IBM Pledge dated 1/11/2005