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 cutting-edge on strategies for facing aliasing in object-oriented programming. It marks the twentieth anniversary of the paper The Geneva conference at the therapy of item Aliasing through 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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Extra resources for Aliasing in Object-Oriented Programming: Types, Analysis, and Verification

Example text

Here, the keyword rep has the same meaning as this above when interpreted as an owner, and peer is the same as owner. The keyword any is new and denotes a read-only reference to an object with unknown owner. The lack of permission parameters requires that the Links of a List store read-only references to their data elements—though this can be fixed using generics. The line marked (***) shows that leaking references to representation objects is possible, but only via read-only references. first; // ok, aLink is read-only (***) The owners-as-modifiers discipline increases the flexibility of the reference structures that can be expressed and relieves the programmer of the burden of propagating permissions through the code, at the cost of losing modification rights.

Mode any expresses that the programmer does not care about ownership information. While this loses topological information associated with owner names, this is a design choice, as any references are used not to restrict the topology of a program, but to enforce encapsulation—modifications cannot occur through an any reference. Generic Universe Types [54] also include a mode lost which refers to indicate that information about ownership has been lost in the type system (‘don’t know’). References with this mode cannot be updated; the presence of lost is like an existential type, with a restriction on the operations permitted on such references.

Generic Universe Types [54] also include a mode lost which refers to indicate that information about ownership has been lost in the type system (‘don’t know’). References with this mode cannot be updated; the presence of lost is like an existential type, with a restriction on the operations permitted on such references. Later work on Universes adds generic types to the underlying language and further separates the mechanisms to specify encapsulation and to restrict the topology of the object graph [54,60].

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