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

By Dave Clarke, James Noble, Tobias Wrigstad

This booklet provides a survey of the state of the art on thoughts for facing aliasing in object-oriented programming. It marks the twentieth anniversary of the paper The Geneva conference at the remedy 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 prepared in topical sections at the Geneva conference, possession, concurrency, alias research, controlling results, verification, programming languages, and visions.

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

Example text

As a consequence, the links are writeable by sibling objects. Another approach that produces the effect of multiple object owners is Tribal Ownership [34]. This was proposed by Cameron, Noble and Wrigstad and relies on earlier work by Clarke et al. on the virtual class calculus Tribe [41]. In Tribal Ownership, ownership nesting is reflected in the nesting of virtual classes and each object has an out reference to its enclosing object, equal to being able to name one’s owner. Tribal Ownership allows different prescriptive ownership policies to be plugged into the system which gives rise to different levels of protection.

9] uses aspects to facilitate a more modular specification of the code dealing with scoped memories. The ScopeJ approach has also been adapted and applied to SCJ (Safety Critical Java Specification) [133]. 4 Ownership for Security One of the original motivations for Confined Types was to address security problems found in the Java library, namely, to prevent certain references from escaping their defining scope. More specifically, each instance of Java Class has a list of signers that the security architecture uses to determine the access rights of the class at run-time.

This mechanism allows both the creation of representation objects external to the intended owning object, as well as returning temporary references to internal objects. Although this mechanism temporarily relaxes the topological restriction, it could be used safely to implement iterators that could access a list’s links, without allowing the iterator to escape the dynamic scope in which it is defined. In any case, one can view this as a mechanism vs. policy issue. Such owners provide a mechanism for temporarily violating the protection, but it can only be used if the interface of the class exposes methods/fields with this in their type.

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