Aliasing in Object-Oriented Programming: Types, Analysis, by Dave Clarke, James Noble, Tobias Wrigstad

By Dave Clarke, James Noble, Tobias Wrigstad

This ebook offers a survey of the state of the art on suggestions for facing aliasing in object-oriented programming. It marks the twentieth anniversary of the paper The Geneva conference at the therapy of item Aliasing via John Hogg, Doug Lea, Alan Wills, Dennis de Champeaux and Richard Holt. The 22 revised papers have been rigorously reviewed to make sure the top quality.The contributions are geared up in topical sections at the Geneva conference, possession, concurrency, alias research, controlling results, verification, programming languages, and visions.

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Extra info for Aliasing in Object-Oriented Programming: Types, Analysis, and Verification

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Their core protection model is similar to that of Confined Types [86] and Clarke’s finitary version of Ownership Types in the object calculus [45]. In one of the few systems that allows owners to vary (without using ownership transfer), Yu, Potter and Xue [99] introduce the owners-as-downgraders policy which increases the flexibility of ownership types systems by allowing an object to downgrade or declassify an object’s owner, thereby allowing previously protected objects to be accessible beyond what usually would be allowed.

A variant Jo∃deep enforces the owners-as-dominators policy. Dietl, Drosspoloulou and Müller [53,60] extended Universes to include generics. This was the first type system to combine the owners-as-modifiers discipline with type genericity. Their approach also aims for a seamless integration of genericity with the ownership mechanisms and enables the separation of the specification of the topology from the encapsulation constraints, which opens the door for more flexible systems to be expressed [54].

Generational Ownership. References can refer to earlier generations, but not newer ones. existing object, including their receiver. The underlying principle is that aliasing is unrestricted, but modifications of an object can only be initiated by its owner. Although the owners-as-modifiers discipline was originally inspired by Flexible Alias Protection, the main driving force behind the design of Universes has been requirements coming from the verification of object-oriented programs. Indeed, Universes have been used extensively to support the verification of objectoriented programs [107,106], and they have been integrated into JML, the Java Modelling Language [56].

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