Structured Program Generation Techniques
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Source-To-Source Translation and Software Engineering
Journal of Software Engineering and Applications, 2013, 6, 30-40 http://dx.doi.org/10.4236/jsea.2013.64A005 Published Online April 2013 (http://www.scirp.org/journal/jsea) Source-to-Source Translation and Software Engineering David A. Plaisted Department of Computer Science, University of North Carolina at Chapel Hill, Chapel Hill, USA. Email: [email protected] Received February 5th, 2013; revised March 7th, 2013; accepted March 15th, 2013 Copyright © 2013 David A. Plaisted. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT Source-to-source translation of programs from one high level language to another has been shown to be an effective aid to programming in many cases. By the use of this approach, it is sometimes possible to produce software more cheaply and reliably. However, the full potential of this technique has not yet been realized. It is proposed to make source- to-source translation more effective by the use of abstract languages, which are imperative languages with a simple syntax and semantics that facilitate their translation into many different languages. By the use of such abstract lan- guages and by translating only often-used fragments of programs rather than whole programs, the need to avoid writing the same program or algorithm over and over again in different languages can be reduced. It is further proposed that programmers be encouraged to write often-used algorithms and program fragments in such abstract languages. Libraries of such abstract programs and program fragments can then be constructed, and programmers can be encouraged to make use of such libraries by translating their abstract programs into application languages and adding code to join things together when coding in various application languages. -
7. Control Flow First?
Copyright (C) R.A. van Engelen, FSU Department of Computer Science, 2000-2004 Ordering Program Execution: What is Done 7. Control Flow First? Overview Categories for specifying ordering in programming languages: Expressions 1. Sequencing: the execution of statements and evaluation of Evaluation order expressions is usually in the order in which they appear in a Assignments program text Structured and unstructured flow constructs 2. Selection (or alternation): a run-time condition determines the Goto's choice among two or more statements or expressions Sequencing 3. Iteration: a statement is repeated a number of times or until a Selection run-time condition is met Iteration and iterators 4. Procedural abstraction: subroutines encapsulate collections of Recursion statements and subroutine calls can be treated as single Nondeterminacy statements 5. Recursion: subroutines which call themselves directly or indirectly to solve a problem, where the problem is typically defined in terms of simpler versions of itself 6. Concurrency: two or more program fragments executed in parallel, either on separate processors or interleaved on a single processor Note: Study Chapter 6 of the textbook except Section 7. Nondeterminacy: the execution order among alternative 6.6.2. constructs is deliberately left unspecified, indicating that any alternative will lead to a correct result Expression Syntax Expression Evaluation Ordering: Precedence An expression consists of and Associativity An atomic object, e.g. number or variable The use of infix, prefix, and postfix notation leads to ambiguity An operator applied to a collection of operands (or as to what is an operand of what arguments) which are expressions Fortran example: a+b*c**d**e/f Common syntactic forms for operators: The choice among alternative evaluation orders depends on Function call notation, e.g. -
Structured Programming - Retrospect and Prospect Harlan D
University of Tennessee, Knoxville Trace: Tennessee Research and Creative Exchange The aH rlan D. Mills Collection Science Alliance 11-1986 Structured Programming - Retrospect and Prospect Harlan D. Mills Follow this and additional works at: http://trace.tennessee.edu/utk_harlan Part of the Software Engineering Commons Recommended Citation Mills, Harlan D., "Structured Programming - Retrospect and Prospect" (1986). The Harlan D. Mills Collection. http://trace.tennessee.edu/utk_harlan/20 This Article is brought to you for free and open access by the Science Alliance at Trace: Tennessee Research and Creative Exchange. It has been accepted for inclusion in The aH rlan D. Mills Collection by an authorized administrator of Trace: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. mJNDAMNTL9JNNEPTS IN SOFTWARE ENGINEERING Structured Programming. Retrospect and Prospect Harlan D. Mills, IBM Corp. Stnuctured program- 2 ' dsger W. Dijkstra's 1969 "Struc- mon wisdom that no sizable program Ste red .tured Programming" articlel could be error-free. After, many sizable ming haxs changed ho w precipitated a decade of intense programs have run a year or more with no programs are written focus on programming techniques that has errors detected. since its introduction fundamentally alteredhumanexpectations and achievements in software devel- Impact of structured programming. two decades ago. opment. These expectations and achievements are However, it still has a Before this decade of intense focus, pro- not universal because of the inertia of lot of potentialfor gramming was regarded as a private, industrial practices. But they are well- lot of fo puzzle-solving activity ofwriting computer enough established to herald fundamental more change. -
Extending Fortran with Meta-Programming
OpenFortran: Extending Fortran with Meta-programming Songqing Yue and Jeff Gray Department of Computer Science University of Alabama Tuscaloosa, AL, USA {syue, gray}@cs.ua.edu Abstract—Meta-programming has shown much promise for manipulated [1]. MOPs add the ability of meta-programming improving the quality of software by offering programming to programming languages by providing users with standard language techniques to address issues of modularity, reusability, interfaces to modify the internal implementation of the maintainability, and extensibility. A system that supports meta- program. Through the interface, programmers can programming is able to generate or manipulate other programs incrementally change the implementation and the behavior of a to extend their behavior. This paper describes OpenFortran, a program to better suit their needs. Furthermore, a metaprogram Meta-Object Protocol (MOP) that is able to bring the power of can capture the needs of a commonly needed feature and be meta-programming to Fortran, one of the most widely used applied to several different base programs. languages in the area of High Performance Computing (HPC). OpenFortran provides a framework that allows library A MOP may perform the underling adaptation of the base developers to build arbitrary source-to-source program program at either run-time or compile-time. Run-time MOPs transformation libraries for Fortran programs. To relieve the function while a program is executing and can be used to burden of learning the details about how the underlying perform real-time adaptation, for example the Common Lisp transformations are performed, a domain-specific language Object System (CLOS) [13] that allows the mechanisms of named SPOT has been created that allows developers to specify inheritance, method dispatching, and class instantiation to be direct manipulation of programs. -
ROSE Tutorial: a Tool for Building Source-To-Source Translators Draft Tutorial (Version 0.9.11.115)
ROSE Tutorial: A Tool for Building Source-to-Source Translators Draft Tutorial (version 0.9.11.115) Daniel Quinlan, Markus Schordan, Richard Vuduc, Qing Yi Thomas Panas, Chunhua Liao, and Jeremiah J. Willcock Lawrence Livermore National Laboratory Livermore, CA 94550 925-423-2668 (office) 925-422-6278 (fax) fdquinlan,panas2,[email protected] [email protected] [email protected] [email protected] [email protected] Project Web Page: www.rosecompiler.org UCRL Number for ROSE User Manual: UCRL-SM-210137-DRAFT UCRL Number for ROSE Tutorial: UCRL-SM-210032-DRAFT UCRL Number for ROSE Source Code: UCRL-CODE-155962 ROSE User Manual (pdf) ROSE Tutorial (pdf) ROSE HTML Reference (html only) September 12, 2019 ii September 12, 2019 Contents 1 Introduction 1 1.1 What is ROSE.....................................1 1.2 Why you should be interested in ROSE.......................2 1.3 Problems that ROSE can address...........................2 1.4 Examples in this ROSE Tutorial...........................3 1.5 ROSE Documentation and Where To Find It.................... 10 1.6 Using the Tutorial................................... 11 1.7 Required Makefile for Tutorial Examples....................... 11 I Working with the ROSE AST 13 2 Identity Translator 15 3 Simple AST Graph Generator 19 4 AST Whole Graph Generator 23 5 Advanced AST Graph Generation 29 6 AST PDF Generator 31 7 Introduction to AST Traversals 35 7.1 Input For Example Traversals............................. 35 7.2 Traversals of the AST Structure............................ 36 7.2.1 Classic Object-Oriented Visitor Pattern for the AST............ 37 7.2.2 Simple Traversal (no attributes)....................... 37 7.2.3 Simple Pre- and Postorder Traversal.................... -
Towards Large-Scale Refactoring for Ocaml
Towards Large-scale Refactoring for OCaml REUBEN N. S. ROWE, University of Kent, UK SIMON J. THOMPSON, University of Kent, UK Refactoring is the process of changing the way a program works without changing its overall behaviour. The functional programming paradigm presents its own unique challenges to refactoring. For the OCaml language in particular, the expressiveness of its module system makes this a highly non-trivial task. The use of PPX preprocessors, other language extensions, and idiosyncratic build systems complicates matters further. We begin to address the question of how to refactor large OCaml programs by looking at a particular refactoring—value binding renaming—and implementing a prototype tool to carry it out. Our tool, Rotor, is developed in OCaml itself and combines several features to manage the complexities of refactoring OCaml code. Firstly it defines a rich, hierarchical way of identifying bindings which distinguishes between structures and functors and their associated module types, and is able to refer directly to functor parameters. Secondly it makes use of the recently developed visitors library to perform generic traversals of abstract syntax trees. Lastly it implements a notion of ‘dependency’ between renamings, allowing refactorings to be computed in a modular fashion. We evaluate Rotor using a snapshot of Jane Street’s core library and its dependencies, comprising some 900 source files across 80 libraries, and a test suite of around 3000 renamings. We propose that the notion of dependency is a general one for refactoring, distinct from a refactoring ‘precondition’. Dependencies may actually be mutual, in that all must be applied together for each one individually to be correct, and serve as declarative specifications of refactorings. -
Edsger W. Dijkstra: a Commemoration
Edsger W. Dijkstra: a Commemoration Krzysztof R. Apt1 and Tony Hoare2 (editors) 1 CWI, Amsterdam, The Netherlands and MIMUW, University of Warsaw, Poland 2 Department of Computer Science and Technology, University of Cambridge and Microsoft Research Ltd, Cambridge, UK Abstract This article is a multiauthored portrait of Edsger Wybe Dijkstra that consists of testimo- nials written by several friends, colleagues, and students of his. It provides unique insights into his personality, working style and habits, and his influence on other computer scientists, as a researcher, teacher, and mentor. Contents Preface 3 Tony Hoare 4 Donald Knuth 9 Christian Lengauer 11 K. Mani Chandy 13 Eric C.R. Hehner 15 Mark Scheevel 17 Krzysztof R. Apt 18 arXiv:2104.03392v1 [cs.GL] 7 Apr 2021 Niklaus Wirth 20 Lex Bijlsma 23 Manfred Broy 24 David Gries 26 Ted Herman 28 Alain J. Martin 29 J Strother Moore 31 Vladimir Lifschitz 33 Wim H. Hesselink 34 1 Hamilton Richards 36 Ken Calvert 38 David Naumann 40 David Turner 42 J.R. Rao 44 Jayadev Misra 47 Rajeev Joshi 50 Maarten van Emden 52 Two Tuesday Afternoon Clubs 54 2 Preface Edsger Dijkstra was perhaps the best known, and certainly the most discussed, computer scientist of the seventies and eighties. We both knew Dijkstra |though each of us in different ways| and we both were aware that his influence on computer science was not limited to his pioneering software projects and research articles. He interacted with his colleagues by way of numerous discussions, extensive letter correspondence, and hundreds of so-called EWD reports that he used to send to a select group of researchers. -
Combining Source and Target Level Cost Analyses for Ocaml Programs
Combining Source and Target Level Cost Analyses for OCaml Programs Stefan K. Muller Jan Hoffmann Carnegie Mellon University Carnegie Mellon University Abstract bounding gas usage in smart contracts [24]. More generally, Deriving resource bounds for programs is a well-studied it is an appealing idea to provide programmers with imme- problem in the programming languages community. For com- diate feedback about the efficiency of their code at design piled languages, there is a tradeoff in deciding when during time. compilation to perform such a resource analysis. Analyses at When designing a resource analysis for a compiled higher- the level of machine code can precisely bound the wall-clock level language, there is a tension between working on the execution time of programs, but often require manual anno- source code, the target code, or an intermediate represen- tations describing loop bounds and memory access patterns. tation. Advantages of analyzing the source code include Analyses that run on source code can more effectively derive more effective interaction with the programmer and more such information from types and other source-level features, opportunities for automation since the control flow and type but produce abstract bounds that do not directly reflect the information are readily available. The advantage of analyz- execution time of the compiled machine code. ing the target code is that analysis results apply to the code This paper proposes and compares different techniques for that is eventually executed. Many of the tools developed combining source-level and target-level resource analyses in in the programming languages community operate on the the context of the functional programming language OCaml. -
A Bundle of Program Transformation Tools System Description
¡ ¢ £ ¤ ¦ ¨ ¨ ! $ % & ! % $ ' ( * * ( + - . / 0 XT: a bundle of program transformation tools system description Merijn de Jonge 1 CWI, Department SEN, PO Box 94079, 1090 GB Amsterdam, The Netherlands Eelco Visser 2 Universiteit Utrecht, Institute of Information and Computing Sciences PO Box 80089, 3508 TB Utrecht, The Netherlands Joost Visser 3 CWI, Department SEN, PO Box 94079, 1090 GB Amsterdam, The Netherlands Abstract XT bundles existing and newly developed program transformation libraries and tools into an open framework that supports component-based development of program transforma- tions. We discuss the roles of XT’s constituents in the development process of program transformation tools, as well as some experiences with building program transformation systems with XT. 1 Introduction Program transformation encompasses a variety of different, but related, language processing scenarios, such as optimization, compilation, normalization, and reno- vation. Across these scenarios, many common, or similar subtasks can be distin- guished, which opens possibilities for software reuse. To support and demonstrate such reuse across program transformation project boundaries, we have developed XT. XT is a bundle of existing and newly developed libraries and tools useful in the 4 Email:[email protected] 5 Email:[email protected] 6 Email:[email protected] 8 : : ; < > @ BC E G H J @ L N BE H P CH R T V CH Y V H [ ] _ ] 7 c 79 a b d f g i b j g a m oq q b s j g a m oq q b s context of program transformation. It bundles its constituents into an open frame- work for component-based transformation tool development, which is flexible and extendible. -
Graceful Language Extensions and Interfaces
Graceful Language Extensions and Interfaces by Michael Homer A thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Doctor of Philosophy Victoria University of Wellington 2014 Abstract Grace is a programming language under development aimed at ed- ucation. Grace is object-oriented, imperative, and block-structured, and intended for use in first- and second-year object-oriented programming courses. We present a number of language features we have designed for Grace and implemented in our self-hosted compiler. We describe the design of a pattern-matching system with object-oriented structure and minimal extension to the language. We give a design for an object-based module system, which we use to build dialects, a means of extending and restricting the language available to the programmer, and of implementing domain-specific languages. We show a visual programming interface that melds visual editing (à la Scratch) with textual editing, and that uses our dialect system, and we give the results of a user experiment we performed to evaluate the usability of our interface. ii ii Acknowledgments The author wishes to acknowledge: • James Noble and David Pearce, his supervisors; • Andrew P. Black and Kim B. Bruce, the other designers of Grace; • Timothy Jones, a coauthor on a paper forming part of this thesis and contributor to Minigrace; • Amy Ruskin, Richard Yannow, and Jameson McCowan, coauthors on other papers; • Daniel Gibbs, Jan Larres, Scott Weston, Bart Jacobs, Charlie Paucard, and Alex Sandilands, other contributors to Minigrace; • Gilad Bracha, Matthias Felleisen, and the other (anonymous) review- ers of papers forming part of this thesis; • the participants in his user study; • David Streader, John Grundy, and Laurence Tratt, examiners of the thesis; • and Alexandra Donnison, Amy Chard, Juanri Barnard, Roma Kla- paukh, and Timothy Jones, for providing feedback on drafts of this thesis. -
When Polyhedral Transformations Meet SIMD Code Generation
When Polyhedral Transformations Meet SIMD Code Generation Martin Kong Richard Veras Kevin Stock Ohio State University Carnegie Mellon University Ohio State University [email protected] [email protected] [email protected] Franz Franchetti Louis-Noel¨ Pouchet P. Sadayappan Carnegie Mellon University University of California Los Angeles Ohio State University [email protected] [email protected] [email protected] Abstract While hand tuned library kernels such as GotoBLAS address all Data locality and parallelism are critical optimization objectives for the above factors to achieve over 95% of machine peak for spe- performance on modern multi-core machines. Both coarse-grain par- cific computations, no vectorizing compiler today comes anywhere allelism (e.g., multi-core) and fine-grain parallelism (e.g., vector SIMD) close. Recent advances in polyhedral compiler optimization [5, 11] must be effectively exploited, but despite decades of progress at both have resulted in effective approaches to tiling for cache locality, ends, current compiler optimization schemes that attempt to address even for imperfectly nested loops. However, while significant per- data locality and both kinds of parallelism often fail at one of the three formance improvement over untiled code has been demonstrated, objectives. the absolute achieved performance is still very far from machine We address this problem by proposing a 3-step framework, which peak. A significant challenge arises from the fact that polyhedral aims for integrated data locality, multi-core parallelism and SIMD exe- cution of programs. We define the concept of vectorizable codelets, with compiler transformations to produce tiled code generally require properties tailored to achieve effective SIMD code generation for the auxiliary transformations like loop skewing, causing much more codelets. -
A Comparative Analysis of Structured and Object-Oriented Programming Methods
JASEM ISSN 1119-8362 Full-text Available Online at J. Appl. Sci. Environ. Manage. December, 2008 All rights reserved www.bioline.org.br/ja Vol. 12(4) 41 - 46 A Comparative Analysis of Structured and Object-Oriented Programming Methods ASAGBA, PRINCE OGHENEKARO; OGHENEOVO, EDWARD E. CPN, MNCS. Department of Computer Science, University of Port Harcourt, Port Harcourt, Nigeria. [email protected], [email protected]. 08056023566 ABSTRACT: The concepts of structured and object-oriented programming methods are not relatively new but these approaches are still very much useful and relevant in today’s programming paradigm. In this paper, we distinguish the features of structured programs from that of object oriented programs. Structured programming is a method of organizing and coding programs that can provide easy understanding and modification, whereas object- oriented programming (OOP) consists of a set of objects, which can vary dynamically, and which can execute by acting and reacting to each other, in much the same way that a real-world process proceeds (the interaction of real- world objects). An object-oriented approach makes programs more intuitive to design, faster to develop, more amenable to modifications, and easier to understand. With the traditional, procedural-oriented/structured programming, a program describes a series of steps to be performed (an algorithm). In the object-oriented view of programming, instead of programs consisting of sets of data loosely coupled to many different procedures, object- oriented programs