Technical Reports (CIS)

Document Type

Technical Report

Date of this Version

February 2001

Comments

University of Pennsylvania Department of Computer and Information Science Technical Report No. MS-CIS-00-07.

At the time of publication, the author Stephanie C. Weirich was affiliated with Cornell University. Currently June 2007, she is a faculty member in the Department of Computer Information and Science at the University of Pennsylvania.

Abstract

We present the load-calculus, used to model dynamic loading, and prove it sound. The calculus extends the polymorphic λ-calculus with a load primitive that dynamically loads terms that are closed, with respect to values. The calculus is meant to approximate the process of dynamic loading in TAL/Load [4], a version of Typed Assembly Language [7] extending with dynamic linking. To model the key aspects of TAL, the calculus contains references and facilities for named types. Loadable programs may refer to named types defined by the running program, and may export new types to code loaded later. Our approach follows the framework initially outlined by Glew et. al [3]. This calculus has been implemented in the TALx86 [6] version of Typed Assembly Language, and is used to implement a full-featured dynamic linking library, DLpop [4].

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Date Posted: 22 June 2007