Results 1  10
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24
A Region Inference Algorithm
 ACM TRANSACTIONS ON PROGRAMMING LANGUAGES AND SYSTEMS
, 1998
"... This article presents an algorithm which implements the specification. We prove that the algorithm is sound with respect to the region inference rules and that it always terminates even though the region inference rules permit polymorphic recursion in regions. The algorithm is the result of several ..."
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Cited by 89 (4 self)
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This article presents an algorithm which implements the specification. We prove that the algorithm is sound with respect to the region inference rules and that it always terminates even though the region inference rules permit polymorphic recursion in regions. The algorithm is the result of several years of experiments with region inference algorithms in the ML Kit, a compiler from Standard ML to assembly language. We report on practical experience with the algorithm and give hints on how to implement it.
How the design of JML accommodates both runtime assertion checking and formal verification
 SCIENCE OF COMPUTER PROGRAMMING
, 2003
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TypeBased Analysis of Uncaught Exceptions
, 1998
"... This paper presents a program analysis to estimate uncaught exceptions in ML programs. This analysis relies on unificationbased type inference in a nonstandard type system, using rows to approximate both the flow of escaping exceptions (a la effect systems) and the flow of result values (a la cont ..."
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Cited by 80 (2 self)
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This paper presents a program analysis to estimate uncaught exceptions in ML programs. This analysis relies on unificationbased type inference in a nonstandard type system, using rows to approximate both the flow of escaping exceptions (a la effect systems) and the flow of result values (a la controlflow analyses). The resulting analysis is efficient and precise; in particular, arguments carried by exceptions are accurately handled.
Verification of NonFunctional Programs using Interpretations in Type Theory
"... We study the problem of certifying programs combining imperative and functional features within the general framework of type theory. Type theory constitutes a powerful specification language, which is naturally suited for the proof of purely functional programs. To deal with imperative programs, we ..."
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Cited by 63 (4 self)
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We study the problem of certifying programs combining imperative and functional features within the general framework of type theory. Type theory constitutes a powerful specification language, which is naturally suited for the proof of purely functional programs. To deal with imperative programs, we propose a logical interpretation of an annotated program as a partial proof of its specification. The construction of the corresponding partial proof term is based on a static analysis of the effects of the program, and on the use of monads. The usual notion of monads is refined in order to account for the notion of effect. The missing subterms in the partial proof term are seen as proof obligations, whose actual proofs are left to the user. We show that the validity of those proof obligations implies the total correctness of the program. We also establish a result of partial completeness. This work has been implemented in the Coq proof assistant. It appears as a tactic taking an ann...
A modular, polyvariant, and typebased closure analysis
 In ICFP ’97 [ICFP97
"... We observe that the principal typing property of a type system is the enabling technology for modularity and separate compilation [10]. We use this technology to formulate a modular and polyvariant closure analysis, based on the rank 2 intersection types annotated with controlflow information. Modu ..."
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Cited by 56 (1 self)
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We observe that the principal typing property of a type system is the enabling technology for modularity and separate compilation [10]. We use this technology to formulate a modular and polyvariant closure analysis, based on the rank 2 intersection types annotated with controlflow information. Modularity manifests itself in a syntaxdirected, annotatedtype inference algorithm that can analyse program fragments containing free variables: a principal typing property is used to formalise it. Polyvariance manifests itself in the separation of different behaviours of the same function at its different uses: this is formalised via the rank 2 intersection types. As the rank 2 intersection type discipline types at least all (core) ML programs, our analysis can be used in the separate compilation of such programs. 1
Type and effect systems
 ACM Computing Surveys
, 1999
"... Abstract. The design and implementation of a correct system can benefit from employing static techniques for ensuring that the dynamic behaviour satisfies the specification. Many programming languages incorporate types for ensuring that certain operations are only applied to data of the appropriate ..."
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Cited by 47 (0 self)
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Abstract. The design and implementation of a correct system can benefit from employing static techniques for ensuring that the dynamic behaviour satisfies the specification. Many programming languages incorporate types for ensuring that certain operations are only applied to data of the appropriate form. A natural extension of type checking techniques is to enrich the types with annotations and effects that further describe intensional aspects of the dynamic behaviour.
Monadic Encapsulation of Effects: A Revised Approach (Extended Version)
 Journal of Functional Programming
, 1999
"... Launchbury and Peyton Jones came up with an ingenious idea for embedding regions of imperative programming in a pure functional language like Haskell. The key idea was based on a simple modification of HindleyMilner's type system. Our first contribution is to propose a more natural encapsulati ..."
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Cited by 30 (5 self)
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Launchbury and Peyton Jones came up with an ingenious idea for embedding regions of imperative programming in a pure functional language like Haskell. The key idea was based on a simple modification of HindleyMilner's type system. Our first contribution is to propose a more natural encapsulation construct exploiting higherorder kinds, which achieves the same encapsulation effect, but avoids the ad hoc type parameter of the original proposal. The second contribution is a type safety result for encapsulation of strict state using both the original encapsulation construct and the newly introduced one. We establish this result in a more expressive context than the original proposal, namely in the context of the higherorder lambdacalculus. The third contribution is a type safety result for encapsulation of lazy state in the higherorder lambdacalculus. This result resolves an outstanding open problem on which previous proof attempts failed. In all cases, we formalize the intended implementations as simple bigstep operational semantics on untyped terms, which capture interesting implementation details not captured by the reduction semantics proposed previously. 1
TypeBased Analysis and Applications
 In PASTE
, 2001
"... Typebased analysis is an approach to static analysis of programs that has been studied for more than a decade. A typebased analysis assumes that the program type checks, and the analysis takes advantage of that. This paper examines the state of the art of typebased analysis, and it surveys some o ..."
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Cited by 27 (3 self)
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Typebased analysis is an approach to static analysis of programs that has been studied for more than a decade. A typebased analysis assumes that the program type checks, and the analysis takes advantage of that. This paper examines the state of the art of typebased analysis, and it surveys some of the many software tools that use typebased analysis. Most of the surveyed tools use types as discriminators, while most of the theoretical studies use type and effect systems. We conclude that typebased analysis is a promising approach to achieving both provable correctness and good performance with a reasonable effort.
Proof of Imperative Programs in Type Theory
, 1998
"... We present a new approach to certifying functional programs with imperative aspects, in the context of Type Theory. The key is a functional translation of imperative programs, based on a combination of the type and effect discipline and monads. Then an incomplete proof of the specification is built ..."
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Cited by 15 (2 self)
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We present a new approach to certifying functional programs with imperative aspects, in the context of Type Theory. The key is a functional translation of imperative programs, based on a combination of the type and effect discipline and monads. Then an incomplete proof of the specification is built in the Type Theory, whose gaps would correspond to proof obligations. On sequential imperative programs, we get the same proof obligations as those given by FloydHoare logic. Compared to the latter, our approach also includes functional constructions in a straightforward way. This work has been implemented in the Coq Proof Assistant and applied on nontrivial examples.
A Modal Calculus for Effect Handling
, 2003
"... In their purest formulation, monads are used in functional programming for two purposes: (1) to hygienically propagate effects, and (2) to globalize the effect scope  once an effect occurs, the purity of the surrounding computation cannot be restored. As a consequence, monadic typing does not prov ..."
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Cited by 7 (2 self)
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In their purest formulation, monads are used in functional programming for two purposes: (1) to hygienically propagate effects, and (2) to globalize the effect scope  once an effect occurs, the purity of the surrounding computation cannot be restored. As a consequence, monadic typing does not provide very naturally for the practically important ability to handle effects, and there is a number of previous works directed toward remedying this deficiency. It is mostly based on extending the monadic framework with further extralogical constructs to support handling. In this paper we adopt...