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在嵌入式电子系统测试语言的研究设计过程中,需要对语言进行词法分析、语法分析和语义分析.采用基于ANTLR的LL(k)文法进行词法分析、语法分析和抽象语法树遍历时,针对LL(k)文法中不能用左递归和步长限制等问题而遇到的文法推导冲突,指出了可行的解决方案,并构建了无冲突的嵌入式电子系统的测试语言的词法分析和语法分析程序. 相似文献
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编译器技术是计算机科学技术理论与实践结合的最好典范,词法分析技术为编译器前端的词法分析需求提供保障。词法分析是编译的第一步,其功能是读入输入的字符串后产生记号序列,以供语法分析使用。本文以编译程序的语法分析模块为对象进行分析与设计,为编译程序的实施提供基础。 相似文献
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基于IEC61131-3标准的结构化文本语言(简称ST语言)是可编程控制器(简称PLC)编程语言中的一种高级文本语言,文中论述了如何结合词法分析工具Lex及语法分析工具Yacc来进行ST语言编译器前端的设计与实现,其中主要介绍了词法分析、语法分析、语义分析及中间代码生成这几个阶段所涉及到的相关数据结构与算法。 相似文献
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逆向工程在软件开发中的作用和应用现状 总被引:1,自引:0,他引:1
逆向工程已成为目前国际、国内软件工程领域的一个研究热点,文章介绍了逆向工程的基本概念及其在遗产系统的演化、软件复用、大型软件的开发等领域所起的重要作用,以及一些典型的逆向工程工具的应用。 相似文献
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基于Lex和Yacc的C_Minus编译器 总被引:1,自引:0,他引:1
基于Windows环境下的Lex和Yacc集成环境Parser Generator,实现了以C_Minus(C语言子集)语言为源语言的编译器。主要从编译技术的角度对C_Minus语言的词法分析、语法分析、符号表的建立以及目标代码生成的过程进行详细的阐述。 相似文献
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为了提高传统程序依赖性分析的应用范围和灵活性,提出一种新的程序分析方法。该方法分为不完整性分析和完整性分析两部分。在gcc3.2和Linux内核2.4.20-8的编译环境下,利用不同的词法和语法分析模块对程序结构、数据依赖和控制信息进行提取,加快了程序分析的速度,并有效降低了程序数据流依赖分析和控制流依赖分析中算法的复杂度。最后用具体的程序实现证明了该算法的可行性。 相似文献
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数据库访问柔性中间件的设计与实现 总被引:5,自引:0,他引:5
文章提出了一种数据库访问柔性中间件的概念.它的主要作用在于,根据定义的语法规则库,对应用系统的数据库请求进行词法分析和语法分析,并在此基础上,把基于某种数据库管理系统所开发的应用系统要来访问其他数据库管理系统时,所有SQL请求、调用机制、存储过程调用、数据类型等的差异全部在柔性中间件解决,从而实现应用系统的平滑移植. 相似文献
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From rate-distortion analysis to resource-distortion analysis 总被引:1,自引:0,他引:1
《Circuits and Systems Magazine, IEEE》2005,5(3):6-18
The ultimate goal in communication system design is to control and optimize the system performance under resource constraints. As the communication paradigm evolves from the conventional desktop computing, wired, and centralized communication to current mobile, wireless, distributed, and massive communication, video encoding and transmission operate under more and more resource constraints. In traditional video communication applications, such as digital TV broadcast, the major constraint is in the form of transmission bandwidth or storage space, which determines the encoding bit rate. Rate-distortion (R-D) theories have been developed to model the relationship between the coding bit rate and signal distortion. For video communication over mobile devices, the video encoding and transmission operate under additional resource constraints, such as energy supply and on-board computation capability. Therefore, there is a need to extend the traditional R-D analysis to resource-distortion analysis by incorporating the new resource constraints into the R-D analysis framework. In distributed and massive wireless video sensor networks, the resource utilization behaviors of individual video sensors should be well-coordinated through network-level rate allocation and optimum routing so as to maximize the overall performance. In this paper, we start from the classical R-D theory developed by Shannon over 50 years ago, and then review the R-D modelling techniques for modern image and video compression systems. We study the resource-distortion analysis framework for video communication over wireless devices. As one step further, we present the research problem of resource allocation and performance optimization for video compression and communication over a network of wireless communication devices. 相似文献
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针对在三维空间做匀速运动的目标,应用非线性系统的可测性理论,对方位-到达时间TMA(目标运动分析)的可测性进行了分析.基于方位和到达时间方法的单站无源定位技术,是通过观测站接收目标辐射源两次TOA(脉冲到达时间)测量之间由于目标运动所造成目标与观测站之间的径向距离发生变化的信息,对目标进行定位.结果表明在观测站与辐射源间的方位角和俯仰角变化率不能同时为零的情况下,观测机不必做机动就可以实现观测. 相似文献
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Park S. Principe J.C. Smith J.R. Reid S.A. 《IEEE transactions on bio-medical engineering》1990,37(8):803-811
An interactive design and analysis tool for displaying and quantifying multiple channels of data is presented. The system allows one to easily visualize multiple data channels and simultaneously observe the effects of filters on the data and to evaluate signal detection algorithms. The software is designed for a workstation environment; it will find application in a variety of applications where one needs to simultaneously visualize multiple data channels. TDAT is being used for the design and evaluation of filters and detection algorithms for electroencephalogram (EEG) waveforms, and it is serving as a prototype of a paperless system to be used by electroencephalographers. This paper describes the general software structure of the system and illustrates many of the system features with examples. 相似文献
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本文主要通过检索和分析在电视与投影中使用触屏技术的中国专利申请,分析在该领域中国专利申请的申请量、申请区域、申请人及发展趋势,并尝试对触屏技术提出一些有益的建议。 相似文献
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《IEE Review》1989,35(2):77-79
Image analysis systems perform measurements or quantification of features in an image. One of the most recently developed areas for the use of image analysis is industrial machine vision, in which the image analyser contributes to the automation of an industrial processing system. One such application is in guiding robots, the image analyser locates the part, checks its conformity to the required model and directs the robot to grasp the part or perform some operation on it 相似文献
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