Contents

A trace monitor observes the sequence of actions in a software system, and when it detects that this sequence matches a given pattern, it executes some extra code of its own. Trace monitors are often specified declaratively using patterns based on regular expressions, context free grammars or logical formulae, and then the trace monitor implementation is generated from the specification. Trace monitors are particularly useful for runtime verification, and many variations have been proposed. Despite this intense interest, there have been hardly any systems that implement the idea in its full generality, because it is hard to generate e#cient code from a purely declarative statement of the pattern. This paper identifies and addresses the challenges faced in generating e#cient trace monitors from declarative pattern-based specifications

A language to script refactoring transformations

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Untangling: A Slice Extraction Refactoring

Separation of concerns in existing code can be achieved by speci c refactoring techniques. Modern refactoring tools support a number of well-known refactoring transformations, including method extraction. In this paper, we examine how method extraction can be improved through program slicing. Furthermore, we show how a generalization of such slice extraction can be applied to untangle existing code by extracting aspects

Query Technologies and Applications for Program Comprehension

Industrial software systems are large and complex, both in terms of the software entities and their relationships. Consequently, understanding how a software system works requires the ability to pose queries over the design-level entities of the system. Traditionally, this task has been supported by simple tools (e.g., grep) combined with the programmer's intuition and experience. Recently, however, specialized code query technologies have matured to the point where they can be used in industrial situations, providing more intelligent, timely, and efficient responses to developer queries. This working session aims to explore the state of the art in code query technologies, and discover new ways in which these technologies may be useful in program comprehension. The session brings together researchers and practitioners. We survey existing techniques and applications, trying to understand the strengths and weaknesses of the various approaches, and sketch out new frontiers that hold promise