scholarly journals Parameterized cast calculi and reusable meta-theory for gradually typed lambda calculi

2021 ◽  
Vol 31 ◽  
Author(s):  
JEREMY G. SIEK ◽  
TIANYU CHEN
Keyword(s):  
Lambda Calculus ◽  
The Other ◽  
Type Safety ◽  
Space Efficiency ◽  
Typed Lambda Calculus ◽  
Evaluation Strategies ◽  
Gradual Typing ◽  
Language Specification ◽  
Meta Theory

Abstract The research on gradual typing has led to many variations on the Gradually Typed Lambda Calculus (GTLC) of Siek & Taha (2006) and its underlying cast calculus. For example, Wadler and Findler (2009) added blame tracking, Siek et al. (2009) investigated alternate cast evaluation strategies, and Herman et al. (2010) replaced casts with coercions for space efficiency. The meta-theory for the GTLC has also expanded beyond type safety to include blame safety (Tobin-Hochstadt & Felleisen, 2006), space consumption (Herman et al., 2010), and the gradual guarantees (Siek et al., 2015). These results have been proven for some variations of the GTLC but not others. Furthermore, researchers continue to develop variations on the GTLC, but establishing all of the meta-theory for new variations is time-consuming. This article identifies abstractions that capture similarities between many cast calculi in the form of two parameterized cast calculi, one for the purposes of language specification and the other to guide space-efficient implementations. The article then develops reusable meta-theory for these two calculi, proving type safety, blame safety, the gradual guarantees, and space consumption. Finally, the article instantiates this meta-theory for eight cast calculi including five from the literature and three new calculi. All of these definitions and theorems, including the two parameterized calculi, the reusable meta-theory, and the eight instantiations, are mechanized in Agda making extensive use of module parameters and dependent records to define the abstractions.

scholarly journals The computational content of atomic polymorphism

2018 ◽  
Vol 27 (5) ◽  
pp. 625-638
Author(s):  
Gilda Ferreira ◽  
Vasco T Vasconcelos
Keyword(s):  
Lambda Calculus ◽  
The Other ◽  
Typed Lambda Calculus ◽  
Polymorphic System

AbstractWe show that the number-theoretic functions definable in the atomic polymorphic system (${\mathbf{F}}_{\mathbf{at}}$) are exactly the extended polynomials. Two proofs of the above result are presented: one, reducing the functions’ definability problem in ${\mathbf{F}}_{\mathbf{at}}$ to definability in the simply typed lambda calculus ($\lambda ^{\rightarrow }$) and the other, directly adapting Helmut Schwichtenberg’s strategy for definability in $\lambda ^{\rightarrow }$ to the atomic polymorphic setting. The uniformity granted in the polymorphic system, when compared with the simply typed lambda calculus, is emphasized.

scholarly journals Properties of Constrained Generalization Algorithms

10.29007/xtb8 ◽  
2018 ◽  
Author(s):  
Thierry Boy de La Tour
Keyword(s):  
Lambda Calculus ◽  
Higher Order ◽  
Relative Strength ◽  
Second Order ◽  
The Other ◽  
First Order ◽  
Deterministic Algorithms ◽  
Typed Lambda Calculus ◽  
Order Constraints

Two non deterministic algorithms for generalizing a solution of a constraint expressed in second order typed lambda-calculus are presented. One algorithm derives from the proof of completeness of the higher order unification rules by D. C. Jensen and T. Pietrzykowski, the other is abstracted from an algorithm by N. Peltier and the author for generalizing proofs. A framework is developed in which such constrained generalization algorithms can be designed, allowing a uniform presentation for the two algorithms. Their relative strength at generalization is then analyzed through some properties of interest: their behaviour on valid and first order constraints, or whether they may be iterated or composed.

scholarly journals Backpropagation in the simply typed lambda-calculus with linear negation

2020 ◽  
Vol 4 (POPL) ◽  
pp. 1-27 ◽  
Author(s):  
Aloïs Brunel ◽  
Damiano Mazza ◽  
Michele Pagani
Keyword(s):  
Lambda Calculus ◽  
Typed Lambda Calculus

The Simply Typed Lambda Calculus

2013 ◽  
pp. 5-54
Author(s):  
Henk Barendregt ◽  
Wil Dekkers ◽  
Richard Statman
Keyword(s):  
Lambda Calculus ◽  
Typed Lambda Calculus

scholarly journals An Abstract Contract Theory for Programs with Procedures

2021 ◽  
pp. 152-171
Author(s):  
Christian Lidström ◽  
Dilian Gurov
Keyword(s):  
Programming Languages ◽  
Contract Theory ◽  
Denotational Semantics ◽  
The Other ◽  
Hoare Logic ◽  
Basic Building Block ◽  
Sequential Programming ◽  
Modular Verification ◽  
The One ◽  
Meta Theory

AbstractWhen developing complex software and systems, contracts provide a means for controlling the complexity by dividing the responsibilities among the components of the system in a hierarchical fashion. In specific application areas, dedicated contract theories formalise the notion of contract and the operations on contracts in a manner that supports best the development of systems in that area. At the other end, contract meta-theories attempt to provide a systematic view on the various contract theories by axiomatising their desired properties. However, there exists a noticeable gap between the most well-known contract meta-theory of Benveniste et al. [5], which focuses on the design of embedded and cyber-physical systems, and the established way of using contracts when developing general software, following Meyer’s design-by-contract methodology [18]. At the core of this gap appears to be the notion of procedure: while it is a central unit of composition in software development, the meta-theory does not suggest an obvious way of treating procedures as components.In this paper, we provide a first step towards a contract theory that takes procedures as the basic building block, and is at the same time an instantiation of the meta-theory. To this end, we propose an abstract contract theory for sequential programming languages with procedures, based on denotational semantics. We show that, on the one hand, the specification of contracts of procedures in Hoare logic, and their procedure-modular verification, can be cast naturally in the framework of our abstract contract theory. On the other hand, we also show our contract theory to fulfil the axioms of the meta-theory. In this way, we give further evidence for the utility of the meta-theory, and prepare the ground for combining our instantiation with other, already existing instantiations.

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