Douglas A Howe

US Patent:

6343372, Jan 29, 2002

Filed:

Jun 11, 1999

Appl. No.:

09/330526

Inventors:

Amy Patricia Felty - Berkeley Heights NJ
Douglas J. Howe - Berkeley Heights NJ
Abhik Roychoudhury - Stony Brook NY

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06F 944

US Classification:

717 2, 717 4, 717 7, 703 2

Abstract:

A method of synthesizing an algorithm for transforming a program from a first form to a second form includes first formalizing a language associated with the program to be transformed in accordance with a theorem proving system. Then, a proof is built in accordance with the theorem proving system based on a theorem asserting a representability associated with the program, the representability being expressed as inductive predicates over semantic domains. The method then extracts the algorithm based on the proof. The algorithm is capable of transforming the program from the first form to the second form. In one embodiment, the algorithm is a correctness verified abstraction algorithm and the theorem proving system is Nuprl.

US Patent:

61579017, Dec 5, 2000

Filed:

Aug 25, 1998

Appl. No.:

9/139186

Inventors:

Douglas J. Howe - Berkeley Heights NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06F 1710

US Classification:

703 2

Abstract:

A type annotation technique such that expressions are assigned and annotated with types in such a way that types can be efficiently maintained during inference without new syntactic restrictions being placed on the expressions or underlying logic within the verification system. More particularly, in accordance with the technique, expressions, i. e. terms, are annotated using a particular labeling scheme such that, during verification, if an expression is annotated the verification may proceed without any additional type inference or type checking with regard to that expression.