By Dave Clarke, James Noble, Tobias Wrigstad
This booklet offers a survey of the state of the art on suggestions for facing aliasing in object-oriented programming. It marks the 20 th 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 equipped in topical sections at the Geneva conference, possession, concurrency, alias research, controlling results, verification, programming languages, and visions.
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Additional info for Aliasing in Object-Oriented Programming: Types, Analysis, and Verification
Conﬁned Types, in their original form, enforce the following informal soundness condition: An object of conﬁned type is encapsulated within its deﬁning scope . 30 D. Clarke et al. This is enforced using a small set of annotations and a statically checkable set of rules. Firstly, classes may be annotated as confined to indicate that their instances are conﬁned types and cannot be accessed outside their deﬁning package. Secondly, methods that can safely be inherited by conﬁned types must be marked as anonymous—anonymous methods cannot export the this reference.
In contrast to most other ownership systems, the ownership relations of their system are conditions that need not always hold. Invariants may, for example, be temporarily broken during ownership transfer, as this is not an atomic operation, and involves passing the reference and changing the owner ﬁeld of the moved object. 4 35 Ownership Transfer One restriction common to early ownership systems is that the owner of an object must be set upon creation and then ﬁxed for the lifetime of the object.
To preserve owners-as-dominators, instances of inner classes should belong to the enclosing instance’s representation, however SafeJava allows instead instances of inner classes to be owned by the owner of the enclosing instances. This allows patterns such as iterators to be expressed. From a programming standpoint, this relaxation is always intentional as the inner class must be provided explicitly and it is internal to the class whose representation is to be exposed. 6) formalise this style of ownership, but address it in a more structured fashion with a clearer semantics.