Technical Reports (CIS)

Document Type

Technical Report

Date of this Version

January 2000

Comments

University of Pennsylvania Department of Computer and Information Science Technical Report No. MS-CIS-00-13.

NOTE: 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 and Information Science at the University of Pennsylvania.

Abstract

We present the design and implementation of a framework for flexible and safe dynamic linking of native code. Our approach extends Typed Assembly Language with a primitive for loading and typechecking code, which is flexible enough to support a variety of linking strategies, but simple enough that it does not significantly expand the trusted computing base. Using this primitive, along with the ability to compute with types, we show that we can program many existing dynamic linking approaches. As a concrete demonstration, we have used our framework to implement dynamic linking for a type-safe dialect of C, closely modeled after the standard linking facility for Unix C programs. Aside from the unavoidable cost of verification, our implementation performs comparably with the standard, untyped approach.

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Date Posted: 13 June 2007