内容简介：Sébastien Doeraene, Ph.D. thesisThis is the thesis behind
Cross-Platform Language Design
Sébastien Doeraene, Ph.D. thesis
This is the thesis behind Scala.js , the dialect of Scala that compiles to JavaScript.
Abstract
Programming languages are increasingly compiled to multiple runtimes, each featuring their own rich structures such as their object model. Furthermore, they need to interact with other languages targeting said runtimes. A language targeting only one runtime can be designed to tailor its semantics to those of that runtime, for easy interoperability with other languages. However, in a language targeting multiple runtimes with differing semantics, it is difficult to cater to each of them while retaining a common behavior across runtimes. We call cross-platform language a language that aims at being both portable across platforms and interoperable with each target platform. Portability is the ability for a program or a library to cross-compile for multiple platforms, and behave the same way on all of them. Interoperability is the ability to communicate with other languages on the same platform. While many cross-compiling languages focus on one of these two properties—only adding support for the other one as an afterthought—, languages that are designed from the ground up to support both are rare.
In this thesis, we present the design of Scala.js, the dialect of Scala targeting the JavaScript platform, which turned Scala into a cross-platform language. On the one hand, Scala programs can be cross-compiled for the JVM and JavaScript with portable semantics. On the other hand, whereas Scala/JVM interoperates with Java, Scala.js interoperates with JavaScript, allowing to use any JavaScript library. Along the dissertation, we give insights that can be transferred to the design of other cross-platform languages, although with a bias towards those targeting the JVM and JavaScript.
The first and most obvious challenge is to reconcile the static nature of Scala's object model with JavaScript's dynamic one. Besides the ability to mutate a class hierarchy at run-time in JavaScript, there are fundamental differences between the two models, in particular the difference between compile-time overloading and run-time overloading. We discuss how such semantic mismatches can live in harmony within the language.
The second challenge is to obtain good performance from a language where interoperability with a dynamic and unknown part of the program is pervasive. To that end, we design and specify an intermediate representation (IR) with first-class support for dynamically typed interoperability features in addition to statically typed JVM-style operations. Despite its tight integration with the open world of JavaScript, most of the IR can be considered as a closed world where advanced whole-program optimizations can be performed. The performance of the overall system is evaluated and shown to be competitive with hand-written JavaScript, and even with Scala/JVM in some cases.
Keywords: interoperability, portability, language design, cross-platform, performance, Scala, JavaScript.
以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，也希望大家多多支持 码农网
猜你喜欢:
本站部分资源来源于网络，本站转载出于传递更多信息之目的，版权归原作者或者来源机构所有，如转载稿涉及版权问题，请联系我们。
马尔可夫链：模型、算法与应用
Wai-Ki Ching、Ximin Huang / 陈曦 / 清华大学出版社 / 2015-6 / 39
《马尔可夫链：模型、算法与应用 应用数学译丛》讲述了马尔可夫链模型在排队系统、网页重要性排名、制造系统、再制造系统、库存系统以及金融风险管理等方面的最新应用进展.全书共安排8章内容，第1章介绍马尔可夫链、隐马尔可夫模型和马尔可夫决策过程的基本理论和方法，其余7章分别介绍马尔可夫链模型在不同领域中的应用. 《马尔可夫链：模型、算法与应用 应用数学译丛》可作为自动化、工业工程、统计学、应用数学以及管理......一起来看看 《马尔可夫链：模型、算法与应用》 这本书的介绍吧!
