毕业-外文翻译.doc

JavaScript程序的动态行为分析 摘要 JavaScript编程语言是广泛用于编程也越来越多地用于计算因此提高正确性、安全性和JavaScript应用程序性能静态分析和编译。许多这些技术旨在在一些最动态特性的语言然而如何利用语言的这些特性。在本文中我们广泛使用JavaScript程序并分析如何以及为什么使用动态特性。我们关键词：介绍 An Analysis of the Dynamic Behavior of JavaScript Programs Abstract The JavaScript programming language is widely used for web programming and, increasingly, for general purpose computing.As such, improving the correctness, security and performance of JavaScript applications has been the driving force for research in type systems, static analysis and compiler techniques for this language. Many of these techniques aim to reign in some of the most dynamic features of the language, yet little seems to be known about how programmers actually utilize the language or these features. In this paper we perform an empirical study of the dynamic behavior of a corpus of widely-used JavaScript programs, and analyze how and why the dynamic features are used. We report on the degree of dynamism that is exhibited by these JavaScript programs and compare that with assumptions commonly made in the literature and accepted industry benchmark suites. Keywords：Dynamic Behavior, Execution Tracing, Dynamic Metrics, Program Analysis, JavaScript 1. Introduction JavaScript is an object-oriented language designed in 1995 by Brendan Eich at Netscape to allow non-programmers to extend web sites with client-side executable code. Unlike more traditional languages such as Java, C# or even Smalltalk, it does not have classes, and does not encourage encapsulation or even structured programming. Instead JavaScript strives to maximize flexibility. JavaScript’s success is undeniable. As a data point, it is used by 97 out of the web’s 100 most popular sites.2 The language is also becoming a general purpose computing platform with office applications, browsers and development environments being developed in JavaScript. It has been dubbed the “assembly language” of the Internet and is targeted by code generators from the likes of Java a