Skip to main content
Article
PolyAML: A Polymorphic Aspect-Oriented Functional Programming Language (Extended Version)
Technical Reports (CIS)
  • Daniel S Dantas, Princeton University
  • David Walker, Princeton University
  • Geoffrey Washburn, University of Pennsylvania
  • Stephanie C Weirich, University of Pennsylvania
Document Type
Technical Report
Date of this Version
5-1-2005
Comments
University of Pennsylvania Department of Computer and Information Science Technical Report No. MS-CIS-05-07.
Abstract

This paper defines PolyAML, a typed functional, aspect-oriented programming language. The main contribution of PolyAML is the seamless integration of polymorphism, run-time type analysis and aspect-oriented programming language features. In particular, PolyAML allows programmers to define type-safe polymorphic advice using pointcuts constructed from a collection of polymorphic join points. PolyAML also comes equipped with a type inference algorithm that conservatively extends Hindley-Milner type inference. To support first-class polymorphic point-cut designators, a crucial feature for developing aspect-oriented profiling or logging libraries, the algorithm blends the conventional Hindley-Milner type inference algorithm with a simple form of local type inference.

We give our language operational meaning via a type-directed translation into an expressive type-safe intermediate language. Many complexities of the source language are eliminated in this translation, leading to a modular specification of its semantics. One of the novelties of the intermediate language is the definition of polymorphic labels for marking control-flow points. These labels are organized in a tree structure such that a parent in the tree serves as a representative for all of its children. Type safety requires that the type of each child is less polymorphic than its parent type. Similarly, when a set of labels is assembled as a pointcut, the type of each label is an instance of the type of the pointcut.

Citation Information
Daniel S Dantas, David Walker, Geoffrey Washburn and Stephanie C Weirich. "PolyAML: A Polymorphic Aspect-Oriented Functional Programming Language (Extended Version)" (2005)
Available at: http://works.bepress.com/stephanie_weirich/10/