Download Programming Languages and Systems: 18th European Symposium by Philip Wadler, Robert Bruce Findler (auth.), Giuseppe PDF

By Philip Wadler, Robert Bruce Findler (auth.), Giuseppe Castagna (eds.)

This ebook constitutes the refereed lawsuits of the 18th ecu Symposium on Programming, ESOP 2009, held in York, united kingdom, in March 2009, as a part of ETAPS 2009, the ecu Joint meetings on idea and perform of software program.

The 26 revised complete papers provided including abstracts of invited talks have been rigorously reviewed and chosen from ninety eight complete paper submissions. the themes addressed are typed sensible programming, computational results, forms for object-oriented languages, verification, protection, concurrency, service-oriented computing, parallel and concurrent programming.

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Read or Download Programming Languages and Systems: 18th European Symposium on Programming, ESOP 2009, Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2009, York, UK, March 22-29, 2009. Proceedings PDF

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Additional info for Programming Languages and Systems: 18th European Symposium on Programming, ESOP 2009, Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2009, York, UK, March 22-29, 2009. Proceedings

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E) v (δ) kv cs (S TEP C ST ) (I D C ST ) ιs d cˆ s (C MP C ST ) (A PP C ST ) c→d sv (FAIL C ST ) Faill s l (FAIL FC) Fail ◦ (c → d) s Γ [x → S] e : T Γ λx : S. e : S → T −→ −→ −→ −→ −→ −→ −→ −→ e[x → v] δ(k, v) c s s d ◦ cˆ s d (s c v) blame l blame l if c −→X c Single-step evaluation: e −→ e E[e] −→ E[e ] e −→ blame l E[e] −→ blame l Fig. 7. ) (λx : Int. x) to be a value. It should instead reduce to blame l. Instead of trying to solve this in the coercion calculi, we add a reduction rule (FAIL FC) to λ→· to handle this situation.

Int ⇐ Dyn l2 Dyn ⇐ Int l1 4 −→∗ 4 On the other hand, casting an integer to Dyn and then to Bool raises an error and reports the source location of the cast that failed. Bool ⇐ Dyn l2 Dyn ⇐ Int l1 4 −→∗ blame l2 We say that the cast at location l2 is blamed for the cast error. Supported by NSF grant CCF-0702362. Supported by NSF grants CCF-0747431 and CCF-0439017. G. ): ESOP 2009, LNCS 5502, pp. 17–31, 2009. c Springer-Verlag Berlin Heidelberg 2009 18 J. Siek, R. Garcia, and W. Taha Base Types Types Blame labels Constants Variables Expressions B S, T l k x e ⊃ ::= ∈ ∈ ∈ ::= {Int, Bool} B | Dyn | S → T L Integers n ∈ Z K ⊃ {n, True, False} V x | k | λx : T.

6. These rules differ from those of Herman et al. [7] in several ways. First, the rules propagate blame labels. Second, we factor the rule for handling injection-projection pairs over functions types into UD and D. Third, we omit a rule of the form (FAIL L) Faill ◦ c −→ Faill This change is motivated by the addition of blame tracking which makes it possible to distinguish between failures with different causes. If we use FAIL L, then the optimizations for space efficiency change how blame is assigned.

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