Feature-Oriented Software Development (FOSD) provides a multitude of formalisms, methods, languages, and tools for building variable, customizable, and extensible software. Along different lines of research different ideas of what a feature is have been developed. Although the existing approaches have similar goals, their representations and formalizations have not been integrated so far into a common framework. We present a feature algebra as a foundation of FOSD. The algebra captures the key ideas and provides a common ground for current and future research in this field, in which also alternative options can be explored.

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Much of the power of modern Web comes from the ability of a Web page to combine contents and JavaScript code from disparate servers on the same page. While the ability to create such mash-ups is attractive for both the user and the developer because of extra functionality, because of code inclusion, the hosting site effectively opens itself up for attacks and poor programming practices within every JavaScript library or API it chooses to use. In other words, expressiveness comes at the price of losing control. To regain the control, it is therefore valuable to provide means for the hosting page to restrict the behavior of the code that it may include. This paper presents CONSCRIPT, an client-side advice implementation for security, built on top of Internet Explorer 8 a. CONSCRIPT allows the hosting page to express fine-grained application-specific security policies that are enforced at runtime. In addition to presenting 17 widelyranging security and reliability policies that CONSCRIPT enables, we

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AspectJ does not provide a mechanism to hide implementation details from advice. As a result, aspects are tightly coupled to the implementation of the code they advise, while the behaviour of the base code is impossible to determine without analysing all advice that could modify its behaviour. The concept of

This article defines the semantics of MinAML, an idealized aspectoriented programming language, by giving a type-directed translation from a user-friendly external language to a compact, well-defined core language. We argue that our framework is an e#ective way to give semantics to aspect-oriented programming languages in general because the translation eliminates shallow syntactic di#erences between related constructs and permits definition of an elegant and extensible core language.

This paper describes MiniMAO1, a core aspect-oriented language. Unlike previous aspect-oriented calculi and core languages, MiniMAO1 allows around advice to change the target object of an advised operation before proceeding. MiniMAO1 accurately models the ways AspectJ allows changing the target object, e.g., at call join points. Practical uses for changing the target object using advice include proxies and other wrapper objects. MiniMAO1 was designed to serve as a core language for studying modular specification and verification in the aspect-oriented paradigm. To this end MiniMAO1 — has an imperative, reference-based semantics, — models the control-flow effects of changing target object bindings with advice, and — has a safe static type system. The first two features make MiniMAO1 suitable for the study of aspect-oriented mechanisms, such as those found in AspectJ. These features are important for studying the interaction of aspect-oriented language features with modular specification and verification. A statically type-safe language is also import for such research. AspectJ does not have a safe static type system. To achieve static type safety MiniMAO1 uses a slightly different form of proceed and advice binding than in AspectJ. These changes are sufficient for static type safety, but we do not claim that they are necessary; a less restrictive type system might suffice. This paper gives an operational semantics, type system, and proof of soundness for MiniMAO1. 1

A functional aspect is an aspect that has the semantics of a transformation; it is a function that maps a program to an advised program. Functional aspects are composed by function composition. In this paper, we explore functional aspects in the context of aspectoriented refactoring. We show that refactoring legacy applications using functional aspects is just as flexible and expressive as traditional aspects (functional aspects can be refactored in any order), while having a simpler semantics (aspect composition is just function composition), and causes fewer undesirable interactions between aspects (the number of potential interactions between functional aspects is half the number of potential interactions between traditional aspects). We analyze several aspect-oriented programs of different sizes to support our claims.

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Through implicit invocation, procedures are called without explicitly referencing them. Implicit announcement adds to this implicitness by not only keeping implicit which procedures are called, but also where or when — under implicit invocation with implicit announcement, the call site contains no signs of that, or what it calls. Recently, aspect-oriented programming has popularized implicit invocation with implicit announcement as a possibility to separate concerns that lead to interwoven code if conventional programming techniques are used. However, as has been noted elsewhere, as currently implemented it establishes strong implicit dependencies between components, hampering independent software development and evolution. To address this problem, we present a type-based modularization of implicit invocation with implicit announcement that is inspired by how interfaces and exceptions are realized in JAVA. By extending an existing compiler and by rewriting several programs to make use of our proposed language constructs, we found that the imposed declaration clutter tends to be moderate; in particular, we found that for general applications of implicit invocation with implicit announcement, fears that programs utilizing our form of modularization become unreasonably verbose are unjustified.