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Proceedings of the 15th ACM SIGPLAN International Haskell Symposium最新文献

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Partial type constructors in practice 实践中的部分类型构造函数
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-09-06 DOI: 10.1145/3546189.3549923
Apoorv Ingle, Alexander Hubers, J. Garrett Morris
{"title":"Partial type constructors in practice","authors":"Apoorv Ingle, Alexander Hubers, J. Garrett Morris","doi":"10.1145/3546189.3549923","DOIUrl":"https://doi.org/10.1145/3546189.3549923","url":null,"abstract":"Type constructors in functional programming languages are total: a Haskell programmer can equally readily construct lists of any element type. In practice, however, not all applications of type constructors are equally sensible: collections may only make sense for orderable elements, or embedded DSLs might only make sense for serializable return types. Jones et al. proposed a theory of partial type constructors, which guarantees that type applications are sensible, and extends higher-order abstractions to apply equally well to partial and total type constructors. This paper evaluates the practicality of partial type constructors, in terms of both language design and implementation. We extend GHC, the most widely used Haskell compiler, with support for partial type constructors, and test our extension on the compiler itself and its libraries. We show that introducing partial type constructors has a minimal impact on most code, but raises important questions in language and library design.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"361 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132343341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Investigating magic numbers: improving the inlining heuristic in the Glasgow Haskell Compiler 调查幻数:改进格拉斯哥Haskell编译器中的内联启发式
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-09-06 DOI: 10.1145/3546189.3549918
Celeste Hollenbeck, M. O’Boyle, Michel Steuwer
{"title":"Investigating magic numbers: improving the inlining heuristic in the Glasgow Haskell Compiler","authors":"Celeste Hollenbeck, M. O’Boyle, Michel Steuwer","doi":"10.1145/3546189.3549918","DOIUrl":"https://doi.org/10.1145/3546189.3549918","url":null,"abstract":"Inlining is a widely studied compiler optimization that is particularly important for functional languages such as Haskell and OCaml. The Glasgow Haskell Compiler (GHC) inliner is a heuristic of such complexity, however, that it has not significantly changed for nearly 20 years. It heavily relies on hard-coded numeric constants, or magic numbers, based on out-of-date intuition. Dissatisfaction with inlining performance has led to the widespread use of inlining pragmas by programmers. In this paper, we present an in-depth study of the effect of inlining on performance in functional languages. We specifically focus on the inlining behavior of GHC and present techniques to systematically explore the space of possible magic number values, or configurations, and evaluate their performance on a set of real-world benchmarks where inline pragmas are present. Pragmas may slow down individual programs, but on average improve performance by 10%. Searching for the best configuration on a per-program basis increases this performance to an average of 27%. Searching for the best configuration for each program is, however, expensive and unrealistic, requiring repeated compilation and execution. This paper determines a new single configuration that gives a 22% improvement on average across the benchmarks. Finally, we use a simple machine learning model that predicts the best configuration on a per-program basis, giving a 26% average improvement.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131391164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Oregano: staging regular expressions with Moore Cayley fusion 牛至:与Moore Cayley融合的正则表达式
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-09-06 DOI: 10.1145/3546189.3549916
Jamie Willis, Nicolas Wu, T. Schrijvers
{"title":"Oregano: staging regular expressions with Moore Cayley fusion","authors":"Jamie Willis, Nicolas Wu, T. Schrijvers","doi":"10.1145/3546189.3549916","DOIUrl":"https://doi.org/10.1145/3546189.3549916","url":null,"abstract":"Regular expressions are a tool for recognising regular languages, historically implemented using derivatives or non-deterministic finite automata. They are convenient for many light-weight parsing workloads, but their traditional formulation only lends them to matching text, not returning fully-structured results. This contrasts with other forms of parsing, where the aim is to extract meaningful data, for example abstract syntax trees. Yet, most regular expression libraries do not support this useful output, and those that do are often slower, and backed by parser combinator libraries. This paper presents Oregano, a redesign of regular expressions to make use of Moore machines as the underlying machinery; this way the regular expression matcher can produce results. We further show how to produce heterogeneous results, providing a classic applicative interface. To make this representation performant, we leverage the relationship between Cayley representations, continuation-passing style, and staged meta-programming to generate performant code for regular expression matching with fully-structured results.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129425490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Reasonable Agda is correct Haskell: writing verified Haskell using agda2hs 合理的议程是正确的Haskell:使用agda2hs编写经过验证的Haskell
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-09-06 DOI: 10.1145/3546189.3549920
Jesper Cockx, Orestis Melkonian, Lucas Escot, James Chapman, U. Norell
{"title":"Reasonable Agda is correct Haskell: writing verified Haskell using agda2hs","authors":"Jesper Cockx, Orestis Melkonian, Lucas Escot, James Chapman, U. Norell","doi":"10.1145/3546189.3549920","DOIUrl":"https://doi.org/10.1145/3546189.3549920","url":null,"abstract":"Modern dependently typed languages such as Agda can be used to statically enforce the correctness of programs. However, they still lack the large ecosystem of a more popular language like Haskell. To combine the strength of both approaches, we present agda2hs, a tool that translates an expressive subset of Agda to readable Haskell, erasing dependent types and proofs in the process. Thanks to Agda's support for erasure annotations, this process is both safe and transparent to the user. Compared to other tools for program extraction, agda2hs uses a syntax that is already familiar to functional programmers, allows for both intrinsic and extrinsic approaches to verification, and produces Haskell code that is easy to read and audit by programmers with no knowledge of Agda. We present a practical use case of agda2hs at IOG to verify properties of a program generator. While both agda2hs and its ecosystem are still young, our experiences so far show that this is a viable approach to make verified functional programming available to a broader audience. This paper is a literate Agda script, hence all rendered (Agda) code has been typechecked.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134327529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Coinduction inductively: mechanizing coinductive proofs in Liquid Haskell 共归纳:在Liquid Haskell中机械化共归纳证明
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-09-06 DOI: 10.1145/3546189.3549922
Lykourgos Mastorou, N. Papaspyrou, Niki Vazou
{"title":"Coinduction inductively: mechanizing coinductive proofs in Liquid Haskell","authors":"Lykourgos Mastorou, N. Papaspyrou, Niki Vazou","doi":"10.1145/3546189.3549922","DOIUrl":"https://doi.org/10.1145/3546189.3549922","url":null,"abstract":"Liquid Haskell is an inductive verifier that cannot reason about codata. In this work we present two alternative approaches, namely indexed and constructive coinduction, to consistently encode coinductive proofs in Liquid Haskell. The intuition is that indices can be used to enforce the base case in the setting of classical logic and the guardedness check in the constructive proofs. We use our encodings to machine check 10 coinductive proofs, about unary and binary predicates on infinite streams and lists, showcasing how an inductive verifier can be used to check coinductive properties of Haskell code.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129811552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Liquid proof macros 防水宏
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-09-06 DOI: 10.1145/3546189.3549921
Henry Blanchette, Niki Vazou, Leonidas Lampropoulos
{"title":"Liquid proof macros","authors":"Henry Blanchette, Niki Vazou, Leonidas Lampropoulos","doi":"10.1145/3546189.3549921","DOIUrl":"https://doi.org/10.1145/3546189.3549921","url":null,"abstract":"Liquid Haskell is a popular verifier for Haskell programs, leveraging the power of SMT solvers to ease users' burden of proof. However, this power does not come without a price: convincing Liquid Haskell that a program is correct often necessitates giving hints to the underlying solver, which can be a tedious and verbose process that sometimes requires intricate knowledge of Liquid Haskell's inner workings. In this paper, we present Liquid Proof Macros, an extensible metaprogramming technique and framework for simplifying the development of Liquid Haskell proofs. We describe how to leverage Template Haskell to generate Liquid Haskell proof terms, via a tactic-inspired DSL interface for more concise and user-friendly proofs, and we demonstrate the capabilities of this framework by automating a wide variety of proofs from an existing Liquid Haskell benchmark.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123463899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Open transactional actions: interacting with non-transactional resources in STM Haskell 开放事务性操作:与STM Haskell中的非事务性资源交互
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-09-06 DOI: 10.1145/3546189.3549924
J. Conceição, A. R. D. Bois, Samuel da Silva Feitosa, G. H. Cavalheiro, R. Ribeiro
{"title":"Open transactional actions: interacting with non-transactional resources in STM Haskell","authors":"J. Conceição, A. R. D. Bois, Samuel da Silva Feitosa, G. H. Cavalheiro, R. Ribeiro","doi":"10.1145/3546189.3549924","DOIUrl":"https://doi.org/10.1145/3546189.3549924","url":null,"abstract":"This paper addresses the problem of accessing external resources from inside transactions in STM Haskell, and for that purpose introduces a new abstraction called Open Transactional Actions (OTAs) that provides a framework for wrapping non-transactional resources in a transactional layer. OTAs allow the programmer to access resources through IO actions, from inside transactions, and also to register commit and abort handlers: the former are used to make the accesses to resources visible to other transactions at commit time, and the latter to undo changes in the resource if the transaction has to roll back. OTAs, once started, are guaranteed to be executed completely before the hosting transaction can be aborted, guarantying that if a resource is accessed, its respective commit and abort actions will be properly registered. We believe that OTAs could be used by expert programmers to implement useful system libraries and also to give a transactional semantics to fast linearizable data structures, i.e., transactional boosting. As a proof of concept, we present examples that use OTAs to implement transactional file access and transactional boosted data types that are faster than pure STM Haskell in most cases.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130245354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A totally predictable outcome: an investigation of traversals of infinite structures 一个完全可预测的结果:对无限结构遍历的研究
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2022-07-20 DOI: 10.1145/3546189.3549915
Gershom Bazerman
{"title":"A totally predictable outcome: an investigation of traversals of infinite structures","authors":"Gershom Bazerman","doi":"10.1145/3546189.3549915","DOIUrl":"https://doi.org/10.1145/3546189.3549915","url":null,"abstract":"Functors with an instance of the Traversable type class can be thought of as data structures which permit a traversal of their elements. This has been made precise by the correspondence between traversable functors and finitary containers (also known as polynomial functors) -- established in the context of total, necessarily terminating, functions. However, the Haskell language is non-strict and permits functions that do not terminate. It has long been observed that traversals can at times in fact operate over infinite lists, for example in distributing the Reader applicative. The result of such a traversal remains an infinite structure, however it nonetheless is productive -- i.e. successive amounts of finite computation yield either termination or successive results. To investigate this phenomenon, we draw on tools from guarded recursion, making use of equational reasoning directly in Haskell.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116452644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Embedded pattern matching 嵌入式模式匹配
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2021-08-30 DOI: 10.1145/3546189.3549917
T. L. McDonell, Joshua D. Meredith, G. Keller
{"title":"Embedded pattern matching","authors":"T. L. McDonell, Joshua D. Meredith, G. Keller","doi":"10.1145/3546189.3549917","DOIUrl":"https://doi.org/10.1145/3546189.3549917","url":null,"abstract":"Haskell is a popular choice for hosting deeply embedded languages. A recurring challenge for these embeddings is how to seamlessly integrate user defined algebraic data types. In particular, one important, convenient, and expressive feature for creating and inspecting data—pattern matching—is not directly available on embedded terms. We present a novel technique, embedded pattern matching, which enables a natural and user friendly embedding of user defined algebraic data types into the embedded language, and allows programmers to pattern match on terms in the embedded language in much the same way they would in the host language.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114960306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
How to safely use extensionality in Liquid Haskell 如何在Liquid Haskell中安全地使用可扩展性
Proceedings of the 15th ACM SIGPLAN International Haskell Symposium Pub Date : 2021-03-03 DOI: 10.1145/3546189.3549919
Niki Vazou, M. Greenberg
{"title":"How to safely use extensionality in Liquid Haskell","authors":"Niki Vazou, M. Greenberg","doi":"10.1145/3546189.3549919","DOIUrl":"https://doi.org/10.1145/3546189.3549919","url":null,"abstract":"Refinement type checkers are a powerful way to reason about functional programs. For example, one can prove properties of a slow, specification implementation and port the proofs to an optimized pure implementation that behaves the same. But to reason about higher-order programs, we must reason about equalities between functions: we need a consistent encoding of functional extensionality. A natural but naive phrasing of the functional extensionality axiom (funExt) is inconsistent in refinement type systems with semantic subtyping and polymorphism: if we assume funExt, then we can prove false. We demonstrate the inconsistency and develop a new approach to equality in Liquid Haskell: we define a propositional equality in a library we call PEq. Using PEq avoids the inconsistency while proving useful equalities at higher types; we demonstrate its use in several case studies. We validate PEq by building a model and developing its metatheory. Additionally, we prove metaproperties of PEq inside Liquid Haskell itself using an unnamed folklore technique, which we dub 'classy induction'.","PeriodicalId":118757,"journal":{"name":"Proceedings of the 15th ACM SIGPLAN International Haskell Symposium","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115578214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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