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Automatic customization of classes

  • US 8,122,430 B2
  • Filed: 10/29/2007
  • Issued: 02/21/2012
  • Est. Priority Date: 09/29/2003
  • Status: Expired due to Fees
First Claim
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1. A computer readable storage medium containing programming instructions for automatic replacement of object classes, the programming instructions comprising:

  • performing static analysis on a program containing a plurality of objects in order to determine constraints on transformations that can be applied and to detect unused functionality in one or more of the objects to be replaced;

    analyzing the plurality of objects to detect usage patterns of functionality in the one or more objects replaced;

    analyzing at least one execution of the program to collect profile information for the one or more objects; and

    generating customized classes based upon the static analysis and the usage patterns detected and the profile information which has been collected;

    wherein the generating customized classes based upon the usage patterns detected includes;

    identifying a customizable container class C with superclass B;

    creating a class CustomC which contains methods and fields that are identical to those in class C, wherein if B is not customizable, then CustomC'"'"'s superclass is B, otherwise CustomC'"'"'s superclass is CustomB;

    introducing a type CT, and making both C and CustomC a subtype of CT and wherein type CT contains declarations of all methods in C that are not declared in any superclass of C; and

    introducing a type C

    , and making C

    a subclass of both C and CustomC, wherein type C

    contains no methods, and wherein CT and C

    are intermediate types not provided as output during the generating of custom classes;

    determining at least one equivalence class E of declaration elements and expressions that must have a same type.

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