Download e-book for iPad: ECOOP 2009 – Object-Oriented Programming: 23rd European by Simon Peyton Jones (auth.), Sophia Drossopoulou (eds.)

By Simon Peyton Jones (auth.), Sophia Drossopoulou (eds.)

ISBN-10: 3642030130

ISBN-13: 9783642030130

This e-book constitutes the refereed lawsuits of the twenty third eu convention on Object-Oriented Programming, ECOOP 2009, held in Genoa, Italy, in July 2009.

The 25 revised complete papers, provided including the abstracts of two invited talks and the ECOOP 2008 dinner party speech have been rigorously reviewed and chosen from a complete of 117 submissions. The papers hide issues corresponding to forms, frameworks and modeling; aliasing and transactions; entry keep an eye on and verification; modularity; mining and extracting; refactoring; concurrency, exceptions and initialization; and concurrency and distribution.

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Additional resources for ECOOP 2009 – Object-Oriented Programming: 23rd European Conference, Genoa, Italy, July 6-10, 2009. Proceedings

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M(e n ) in V (R | B0 , B , invoke(t0 , m, [t ], R)) e in V (t | B ) e1 in V (t1 | B1 ) e2 in V (t2 | B2 ) R fresh if (e) e1 else e2 in V (R | B , B1 , B2 , cond (t, t1 , t2 , R)) (true) true in V (bool | true) (false) false in V (bool | true) Fig. 5. t. Figure 3) 18 D. Ancona and G. Lagorio Here only those methods which might be invoked during the execution of the main expression are required to be type safe, and no overriding rule is imposed. These differences stem from the fact that the encoding of Section 2 corresponds to the specification of a typechecking algorithm (since programs are fully annotated with types), whereas here we are specifying a type inference algorithm which has to work with programs which may have no type annotations at all.

We also introduce three additional operators, defined in Fig. 6. Equivalence join ( ) will resolve to unknown if the two sides are not equal. Overriding meet ( ) has the property that if the right side has a defined value (not bot), then it will use the right value, otherwise it will use the left value. The polarity operator ( ) will push all non-bottom values to the top of the lattice. Finally, we also define ⊥A as a tuple lattice which is consistent with the alias lattice A and which maps every relationship to bot.

The corresponding predicate in Figure 4 has four arguments for properly defining predicate override. Coinductive Type Systems for Object-Oriented Languages 19 class(object ) ← true. subclass(X , X ) ← class(X ). subclass(X , object ) ← class(X ). subclass(X , Y ) ← extends (X , Z ), subclass (Z , Y ). type comp(bool , bool ) ← true. type comp([ ], [ ]) ← true. type comp([T1 |L1 ], [T2 |L2 ]) ← type comp(T1 , T2 ), type comp(L1 , L2 ). ∗type comp(obj (C1 , X ), C2 ) ← subclass (C1 , C2 ). ∗type comp(T1 ∨ T2 , C ) ← type comp(T1 , C ), type comp(T2 , C ).

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ECOOP 2009 – Object-Oriented Programming: 23rd European Conference, Genoa, Italy, July 6-10, 2009. Proceedings by Simon Peyton Jones (auth.), Sophia Drossopoulou (eds.)


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