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Proving the Correctness of RecursionBased Automatic Program Transformations
 Theoretical Computer Science
, 1996
"... This paper shows how the Improvement Theorema semantic condition ..."
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This paper shows how the Improvement Theorema semantic condition
Reasoning with Continuations II: Full Abstraction for Models of Control
 In Proceedings of the 1990 ACM Conference on Lisp and Functional Programming
, 1990
"... A fully abstract model of a programming language assigns the same meaning to two terms if and only if they have the same operational behavior. Such models are wellknown for functional languages but little is known about extended functional languages with sophisticated control structures. We show th ..."
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Cited by 31 (3 self)
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A fully abstract model of a programming language assigns the same meaning to two terms if and only if they have the same operational behavior. Such models are wellknown for functional languages but little is known about extended functional languages with sophisticated control structures. We show that a direct model with error values and the conventional continuation model are adequate for functional languages augmented with first and higherorder control facilities, respectively. Furthermore, both models become fully abstract on adding a control delimiter and a parallel conditional to the programming languages.
A semantic view of classical proofs  typetheoretic, categorical, and denotational characterizations (Extended Abstract)
 IN PROCEEDINGS OF LICS '96
, 1996
"... Classical logic is one of the best examples of a mathematical theory that is truly useful to computer science. Hardware and software engineers apply the theory routinely. Yet from a foundational standpoint, there are aspects of classical logic that are problematic. Unlike intuitionistic logic, class ..."
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Classical logic is one of the best examples of a mathematical theory that is truly useful to computer science. Hardware and software engineers apply the theory routinely. Yet from a foundational standpoint, there are aspects of classical logic that are problematic. Unlike intuitionistic logic, classical logic is often held to be nonconstructive, and so, is said to admit no proof semantics. To draw an analogy in the proofsas programs paradigm, it is as if we understand well the theory of manipulation between equivalent specifications (which we do), but have comparatively little foundational insight of the process of transforming one program to another that implements the same specification. This extended abstract outlines a semantic theory of classical proofs based on a variant of Parigot's λµcalculus [24], but presented here as a type theory. After reviewing the conceptual problems in the area and the potential benefits of such a theory, we sketch the key steps of our approach in ...
Typing References by Effect Inference
 4th European Symposium on Programming
, 1992
"... Hindley/Milnerstyle polymorphism is a simple, natural, and flexible type discipline for functional languages, but incorporating imperative extensions is difficult. We present a new technique for typing references in the presence of polymorphism by inferring a concise summary of each expression&apos ..."
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Hindley/Milnerstyle polymorphism is a simple, natural, and flexible type discipline for functional languages, but incorporating imperative extensions is difficult. We present a new technique for typing references in the presence of polymorphism by inferring a concise summary of each expression's allocation behaviora type effect. A simple technique for proving soundness with respect to a reduction semantics demonstrates that the type system prevents type errors. By establishing that the system corresponds to an alternate system better suited to implementation, we obtain an algorithm to perform type and effect inference. 1 Polymorphism and References Hindley/Milnerstyle polymorphism [8, 12] is a simple, natural, and flexible type discipline for functional languages, but incorporating imperative extensions is difficult. While a number of systems for typing reference cells exist [3, 10, 16, 17, 18], we have devised a more direct approach based on inferring a concise summary of each ...
Concurrent Execution Semantics for DAMLS with Subtypes
 In The First International Semantic Web Conference (ISWC
, 2002
"... The DARPA Agent Markup Language ontology for Services (DAMLS) enables the description of Webbased services, such that they can be discovered, accessed and composed dynamically by intelligent software agents and other Web services, thereby facilitating the coordination between distributed, hete ..."
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The DARPA Agent Markup Language ontology for Services (DAMLS) enables the description of Webbased services, such that they can be discovered, accessed and composed dynamically by intelligent software agents and other Web services, thereby facilitating the coordination between distributed, heterogeneous systems on the Web. We describe a formalised syntax and an initial reference semantics for DAMLS, which incorporates subtype polymorphism. We contrast our semantics with an alternate semantics proposed for DAMLS, based on the situation calcu lus and Petri nets.
Verification of Erlang Programs using Abstract Interpretation and Model Checking
, 1999
"... We present an approach for the verification of Erlang programs using abstract interpretation and model checking. In general model checking for temporal logics like LTL and Erlang programs is undecidable. Therefore we define a framework for abstract interpretations for a core fragment of Erlang. oper ..."
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Cited by 22 (3 self)
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We present an approach for the verification of Erlang programs using abstract interpretation and model checking. In general model checking for temporal logics like LTL and Erlang programs is undecidable. Therefore we define a framework for abstract interpretations for a core fragment of Erlang. operational semantics preserves all paths of the standard operational semantics. We consider properties that have to hold on all paths of a system, like properties in LTL. If these properties can be proved for the abstract operational semantics, they also hold for the Erlang program. They can be proved with model checking if the abstract operational semantics is a finite transition system. Therefore we introduce a example abstract interpretation, which has this property. We have implemented this approach as a prototype and were able to prove properties like mutual exclusion or the absence of deadlocks and lifelocks for some Erlang programs.
Translating Core Facile
, 1995
"... In first approximation Core Facile is a simply typed calculus enriched with parallel composition, dynamic channel generation, and inputoutput synchronous communication primitives. In this paper we explore the (dynamic) semantics of core Facile programs. This should be taken as a basis for the def ..."
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In first approximation Core Facile is a simply typed calculus enriched with parallel composition, dynamic channel generation, and inputoutput synchronous communication primitives. In this paper we explore the (dynamic) semantics of core Facile programs. This should be taken as a basis for the definition of abstract machines, the transformation of programs, and the development of modal specification languages. We claim two main contributions. We introduce a new semantics based on the notion of barbed bisimulation. We argue that the derived equivalence provides a more satisfying treatment of restriction, in particular by proving the adequacy of a natural translation of Facile into ßcalculus we suggest that our approach is in good harmony with previous research on the semantics of subcalculi of Core Facile such as Chocs and ßcalculus. We illustrate at an abstract level various aspects of Facile compilation. In particular we introduce an `asynchronous' version of the Facile language...
Total Correctness by Local Improvement in Program Transformation
 In Proceedings of the 22nd Annual ACM SIGPLANSIGACT Symposium on Principles of Programming Languages (POPL
, 1995
"... The goal of program transformation is to improve efficiency while preserving meaning. One of the best known transformation techniques is Burstall and Darlington's unfoldfold method. Unfortunately the unfoldfold method itself guarantees neither improvement in efficiency nor totalcorrectness. ..."
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The goal of program transformation is to improve efficiency while preserving meaning. One of the best known transformation techniques is Burstall and Darlington's unfoldfold method. Unfortunately the unfoldfold method itself guarantees neither improvement in efficiency nor totalcorrectness. The correctness problem for unfoldfold is an instance of a strictly more general problem: transformation by locally equivalencepreserving steps does not necessarily preserve (global) equivalence. This paper presents a condition for the total correctness of transformations on recursive programs, which, for the first time, deals with higherorder functional languages (both strict and nonstrict) including lazy data structures. The main technical result is an improvement theorem which says that if the local transformation steps are guided by certain optimisation concerns (a fairly natural condition for a transformation), then correctness of the transformation follows. The improvement theorem make...
From SOS Rules to Proof Principles: An Operational Metatheory for Functional Languages
 In Proc. POPL'97, the 24 th ACM SIGPLANSIGACT Symposium on Principles of Programming Languages
, 1997
"... Structural Operational Semantics (SOS) is a widely used formalism for specifying the computational meaning of programs, and is commonly used in specifying the semantics of functional languages. Despite this widespread use there has been relatively little work on the imetatheoryj for such semantics. ..."
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Cited by 19 (1 self)
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Structural Operational Semantics (SOS) is a widely used formalism for specifying the computational meaning of programs, and is commonly used in specifying the semantics of functional languages. Despite this widespread use there has been relatively little work on the imetatheoryj for such semantics. As a consequence the operational approach to reasoning is considered ad hoc since the same basic proof techniques and reasoning tools are reestablished over and over, once for each operational semantics speciøcation. This paper develops some metatheory for a certain class of SOS language speciøcations for functional languages. We deøne a rule format, Globally Deterministic SOS (gdsos), and establish some proof principles for reasoning about equivalence which are sound for all languages which can be expressed in this format. More speciøcally, if the SOS rules for the operators of a language conform to the syntax of the gdsos format, then ffl a syntactic analogy of continuity holds, which rel...
A typetheoretic foundation of delimited continuations. Higher Order Symbol
 Comput
, 2009
"... Abstract. There is a correspondence between classical logic and programming language calculi with firstclass continuations. With the addition of control delimiters, the continuations become composable and the calculi become more expressive. We present a finegrained analysis of control delimiters a ..."
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Abstract. There is a correspondence between classical logic and programming language calculi with firstclass continuations. With the addition of control delimiters, the continuations become composable and the calculi become more expressive. We present a finegrained analysis of control delimiters and formalise that their addition corresponds to the addition of a single dynamicallyscoped variable modelling the special toplevel continuation. From a type perspective, the dynamicallyscoped variable requires effect annotations. In the presence of control, the dynamicallyscoped variable can be interpreted in a purely functional way by applying a storepassing style. At the type level, the effect annotations are mapped within standard classical logic extended with the dual of implication, namely subtraction. A continuationpassingstyle transformation of lambdacalculus with control and subtraction is defined. Combining the translations provides a decomposition of standard CPS transformations for delimited continuations. Incidentally, we also give a direct normalisation proof of the simplytyped lambdacalculus with control and subtraction.