A Higher order Module Discipline with Separate Compilation Dynamic Linking and Pickling

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A Higher-order Module Discipline with Separate Compilation, Dynamic Linking, and Pickling DRAFT Denys Duchier, Leif Kornstaedt, Christian Schulte, Gert Smolka Programming Systems Lab DFKI and Universitat des Saarlandes Postfach 15 11 50, D-66041 Saarbrucken, Germany fduchier,kornstae,schulte, September 29, 1998 Abstract We present a higher-order module discipline with separate compilation and concurrent dynamic linking. Based on first-order modules one can program security policies for systems that link modules from untrusted locations (e.g., Java). We introduce a pickling operation that writes persistent clones of volatile, possibly higher-order data structures on the file system. Our pickling operation respects lexical binding. Our module discipline is based on func- tors, which are annotated functions that are applied to modules and return modules. Pickled computed functors can be used interchangeably with com- piled functors. In contrast to compiled functors, pickled computed functors can carry computed data structures with them, which has significant practical applications. 1 Introduction Modularization is an essential technique for developing and maintaining software systems [12, 16]. Programming languages support modularization by replacing complete programs with program fragments called module definitions. Module definitions reside in individual files and are compiled separately. Execution of a module definition installs a module. Module definitions typically import modules, 1

functors

functors can

root functor

t1 supports

support modularization

file system

can designate

dynamic linking

Voir

Publié par

pefav

Langue

English

A Higher-order Module Discipline with Separate

Compilation, Dynamic Linking, and Pickling

DRAFT

Denys Duchier, Leif Kornstaedt, Christian Schulte, Gert Smolka

Programming Systems Lab

DFKI and Universit¨at des Saarlandes

Postfach 15 11 50, D-66041 Saarbr¨ucken, Germany

duchier,kornstae,schulte,smolka

@ps.uni-sb.de

September 29, 1998

Abstract

We present a higher-order module discipline with separate compilation and

concurrent dynamic linking. Based on first-order modules one can program

security policies for systems that link modules from untrusted locations (e.g.,

Java).

We introduce a pickling operation that writes persistent clones of

volatile, possibly higher-order data structures on the file system. Our pickling

operation respects lexical binding. Our module discipline is based on func-

tors, which are annotated functions that are applied to modules and return

modules. Pickled computed functors can be used interchangeably with com-

piled functors. In contrast to compiled functors, pickled computed functors

can carry computed data structures with them, which has significant practical

applications.

Introduction

Modularization is an essential technique for developing and maintaining software

systems [12, 16]. Programming languages support modularization by replacing

complete programs with program fragments called

module definitions

Module

definitions reside in individual files and are

compiled separately

. Execution of a

module definition installs a

module

. Module definitions typically

import

modules,

Voir