Information and software technology special issue on program slicing, 401112, pages 647659, december 1998. Introduction refactoring is the process of changing a software system in such a way that it does not alter the external behavior of the code yet improves its internal structure. Dynamic program slicing is not only used in software debugging but also in software maintenance and software testing 2, 7, 10, 21, 22. They are analysis rather than testing tools because they analyze what is happening behind the scenes that is in the code while the software is running whether being executed with test cases or being used in operation. Dynamic program analysis is the analysis of computer software that is performed by executing programs on a real or virtual processor. Of program slicing debugging testing software maintenance. Demonstrate a given software product matching its requirementspecifications.
It allows for analysis of applications in which you do not have access to the actual code. Software testing slice based testing definition and examples. From wikipedias definition of dynamic program analysis. It summarized static slicing and dynamic slicing also, it summarized white and black box. Which of the following is a dynamic analysis tool for the. This way, agile teams get better effort estimate and get smaller but concrete output in single. Dynamic testing or dynamic analysis is a term used in software engineering to describe the testing of the dynamic behavior of code. History how to extract a slice program slicing techniques applications program.
Several approaches for computing dynamic slices are examined. Program slicing based techniques ppt download slideplayer. Slicing or program slicing is a technique used in software testing which takes a slice or. The point of stress testing is to guarantee that under a steady load for a long span, the servers dont crash, but reacting gradually. Static compile time and dynamic execution time versions. Program slicing and testing in software engineering.
Information and software technology special issue on program slicing, 40,1112, pages 677690, november 1998. Objectives uncover as many as errors or bugs as possible in a givenproduct. Combining dynamic and static slicing for analysing assembler. Given a program p, and a program graph gp in which statements and statement fragments are numbered, and a set v of variables in p, the slice on the variable set v at statement fragment n, written sv,n, is the set node numbers of all statement fragments in p prior to n that contribute to the values of variables in v at statement fragment n.
Dynamic slicing of computer programs sciencedirect. A dynamic slice is constructed with respect to the traditional static slicing criterion together with dynamic information the input sequence supplied to the program, during some specific execution. Static testing vs dynamic testing static testing and dynamic testing are two important techniques relatedto software testing. Dynamic powerpoint presentations digital signage software. However, as far as we know, no detailed studies on evaluating the benefits of using dynamic slicing for locating real faults present in programs have been carried out. They are analysis rather than testing tools because they analyze what is happening behind the scenes that is in the code while the software is running whether being executed with test cases or. Is there a real difference between dynamic analysis and testing. Dynamic program slicing with pinplay intel software. Dynamic testing increases the cost of projectproduct because it does not start early in the software lifecycle and hence any issues fixed in later stages can result in an increase of. My company offers the dms software reengineering toolkit, which contains general machinery for program control and data flow analysis including building custom static code slicers. In this paper we address the dynamic counterpart of the static slicing problemfinding all statements that really affected the value of a variable occurrence for the given program inputs. Ppt program slicing powerpoint presentation free to view id. Validate the quality of a software testing using the minimum costand efforts. Dynamic analysis tools are dynamic because they require the code to be in a running state.
A free powerpoint ppt presentation displayed as a flash slide show on id. But, while covering all related work and scenarios, same user story expands so much that it can not fit either in a week or a sprint timeframe. First, in the program, we calculate the dynamic slice of the interest points variable, and get the current. Therefore the dynamic slicing techniques need to be efcient. In principle, test cases are designed to cover each partition at least once.
Dynamic code analysis is a testing procedure that is part of the software debugging process and used to evaluate a program during realtime execution. For dynamic program analysis to be effective, the target program must be executed with sufficient test inputs to cover almost all possible outputs. In some cases, this even drives the software behavior. During the testing of software modules a blackbox test works first in a cohesive manner as one single unitentity, consisting of numerous modules and second, with the user data that flows across software modules. Soot is a java optimization framework that provides intermedi ate representations of java code designed for static analysis 12. Application of dynamic program slicing technique in test. It is white box testing in that we examine internal rather than external behavior. These are software testing methods which any company must pickprecisely. It identifies vulnerabilities in a runtime environment. However, the slices constructed by slicing can be very large. However, the size of an execution trace may be huge. Dynamic slicing for hypothesis testing bo jiang, chao ye and jun s. In this paper we study the effectiveness of fault location using dynamic slicing for a set of real bugs reported in some widely used software. Slicing techniques have been seeing a rapid development since the original definition by mark weiser.
Dynamic slicing of objectoriented programs springerlink. Driving embedded software quality with automation of unit testing, code coverage, integration testing and static analysis to optimise safety and business critical embedded software. Jun 23, 2016 static testing vs dynamic testing static testing and dynamic testing are two important techniques relatedto software testing. Other applications of slicing include software maintenance, optimization, program analysis, and information flow control. Javaslicer requires the following software on your machine. Slicing methods using static and dynamic analysis information. It identifies vulnerabilities that might have been false negatives in the static code analysis. Therefore, the most critical phase of a structural analysis is to create a computer model, with a finite number of massless members and a finite number of node joint displacements, that will. However, the dynamic dependence graph constructed to. Dynamic slicing is performed on an execution trace by detecting dynamic control and data dependencies. But these algorithms ma y compute o v erlarge slices. Software testing testing tools for embedded software. Dynamic testing involves working with the software, giving input values and checking if the output is as expected.
A static slice consists of all statements in programp that may effect the value of variablev at some pointp, and a dynamic slice consists only of statements that influence the value of variable occurrence for specific program inputs. However, the dynamic dependence graph constructed to compute dynamic slices. Chapter 10 data flow testing slice testing ppt download. None of them are under active development or use that i know about. Bogdan korel and janusz laski introduced dynamic slicing, which works on a specific execution of the. Application of dynamic program slicing technique in test data. Improving program slicing with dynamic pointsto data. Yet the code under test must be executed, and that is done by running the same black box tests used for dynamic testing. Jul 29, 2006 dynamic slicing algorithms have been considered to aid in debugging for many years. Program slicing for refactoring, static slicer using dynamic analyser 1. Automated tools provide flexibility on what to scan for. In computer programming, program slicing is the computation of the set of program statements. It is the time to consider this big user story as epic and start slicing it in smaller user stories.
Dynamic analysis refers to the examination of the physical response from the system to variables that are not constant and change with time. In addition, all real structures potentially have an infinite number of displacements. Dynamic testing is a software testing type, which checks the dynamic behaviour of the code. Cura is a free software program that both prepares your files for printing by converting your model into gcode, and also allows you to control the operation of your lulzbot 3d printer. Restructuring programs by tucking statements into functions. May 16, 20 in addition, all real structures potentially have an infinite number of displacements. Jan 22, 2014 dynamic analysis in software testing 1. There seem to be a variety of dynamic program slicing tools for java built by universities. Slicing introduction background overall approach methodology experiments results conclusion.
A craftsmans approach, 3rd edition data flow testing. These are vital testing techniques accessible for testers anddevelopers in software development lifecycle. In order to check the dynamic behavior, the code must be executed. Program slice has many applications such as program debugging, testing, maintenance, and complexity measurement. First, in the program, we calculate the dynamic slice of the interest point s variable, and get the current value of the interest point s variable. Consequently, it is important to compactly represent the execution trace and perform program analysis e. Dynamic testing is time consuming because it executes the application software or code which requires huge amount of resources. Equivalence partitioning equivalence partitioning is a software testing technique that divides the input data of a software unit into partitions of equivalent data from which test cases can be derived. A study of effectiveness of dynamic slicing in locating real. Reverse engineering reverse engineering supports understanding of a system through identification of the components or artifacts of the system, discovering relationships between them and generating abstractions of that information.
Generate high quality test cases, perform effective tests. A survey and comparison of dynamic slicing methods has been presented by korel and rilling 61. The core and key of software testing is test data generation. Dynamic program analysis is the analysis of computer software that is performed with executing programs built from that software on a real or virtual processor analysis performed without executing programs is known as static code analysis. Static slicing can be used to assist debugging by simplying the program. The sensitivity of dynamic slicing to particular program inputs makes it more useful in program debugging and testing than static slicing. Program slicing is now among the most useful techniques that can. Stress testing or soak testing resembles stack testing yet we continue the heap on the server for a long stretch, say 60 minutes. In the process of generating test data automatically, if the dynamic program slicing technique is used, the efficiency of generating test data can be improved. Presentationpoint is the leading provider of real time and dynamic powerpoint presentations and digital signage software solutions. Dynamic analysis is analytical testing in that the intention is to examine the test item rather than exercise it. Dynamic program slicing hiralal agra w al departmen t of computer sciences purdue univ ersit y w est lafa y ette, in 479072004 joseph r. It computes dynamic backward slices of java programs by attaching to them as a java agent. Javaslicer is an opensource dynamic slicing tool developed by clemens hammacher at saarland university.
The notion of a dynamic dependence graph and its use in computing dynamic slices is discussed. Dynamic program slicing is a dynamic program analysis technique that given a slicing criterion line number, variable, finds all statements in the program affecting if backward sliced or affected by if forward sliced the slicing criterion for a specific execution. Dynamic slicing allows to adapt a slice like in the clouddc. Feb 14, 2014 introduction dynamic slicing is a novel method for detecting interaction between two groups of observations. Slicing has applications in testing and debugging, reengineering, program comprehension and software measurement. Dynamic slicing algorithms have been considered to aid in debugging for many years. Slicing anoverview ofprogramingslicing static anddynamicslicingcomparison.
Refactoring improves the design of software and it makes software easier to understand. What is dynamic analysis tools in software testing. Apr 07, 2015 dynamic program slicing is a dynamic program analysis technique that given a slicing criterion line number, variable, finds all statements in the program affecting if backward sliced or affected by if forward sliced the slicing criterion for a specific execution. Program slicing is a process of finding all the statements in a. Besides debugging 58, 50, 4, dynamic slicing has been used for several applications, including software testing 48, software maintenance 54, 60, and program comprehension 59. Program slicing and approaches to dynamic slicingfor testing. Then in the branch function, we use the method of minimization, and guide the adjustment of program input. The process of slicing deletes those parts of the program which can be determined to have no effect upon the semantics of interest. Often testing is regarded as a dynamic analysis of a software.
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