Porting My Programming Language Onion from Java to Scala
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How Can Java Class Files Be Decompiled?
HOW CAN JAVA CLASS FILES BE DECOMPILED? David Foster Chamblee High School 11th Grade Many computer science courses feature building a compiler as a final project. I have decided to take a spin on the idea and instead develop a decompiler. Specifically, I decided to write a Java decompiler because: one, I am already familiar with the Java language, two, the language syntax does not suffer from feature-bloat, and three, there do not appear to be many Java decompilers currently on the market. I have approached the task of writing a decompiler as a matter of translating between two different languages. In our case, the source language is Java Virtual Machine (VM) Bytecode, and the target language is the Java Language. As such, our decompiler will attempt to analyze the semantics of the bytecode and convert it into Java source code that has equivalent semantics. A nice sideeffect of this approach is that our decompiler will not be dependent upon the syntax of the bytecodes, the compiler used to generate the bytecodes, or the source language (possibly not Java). It will only care whether a class-file’s semantics can be represented in the Java language. Decompilation is divided up into six phases: 1. Read opcodes 2. Interpret opcode behavior 3. Identify Java-language “idioms” 4. Identify patterns of control-flow 5. Generate Java-language statements 6. Format and output to file The first four phases will be discussed in detail within this paper, as they were the primary focus of my research. Further details pertaining to these phases can be gleaned from the accompanying log book. -
Advanced Programming for the Java(TM) 2 Platform
Advanced Programming for the Java(TM) 2 Platform Training Index Advanced Programming for the JavaTM 2 Platform By Calvin Austin and Monica Pawlan November 1999 [CONTENTS] [NEXT>>] [DOWNLOAD] Requires login As an experienced developer on the JavaTM platform, you undoubtedly know how fast moving and comprehensive the Early Access platform is. Its many application programming interfaces (APIs) Downloads provide a wealth of functionality for all aspects of application and system-level programming. Real-world developers never use one Bug Database or two APIs to solve a problem, but bring together key Submit a Bug functionality spanning a number of APIs. Knowing which APIs you View Database need, which parts of which APIs you need, and how the APIs work together to create the best solution can be a daunting task. Newsletters Back Issues To help you navigate the Java APIs and fast-track your project Subscribe development time, this book includes the design, development, test, and deployment phases for an enterprise-worthy auction Learning Centers application. While the example application does not cover every Articles possible programming scenario, it explores many common Bookshelf situations and the discussions leave you with a solid methodology Code Samples for designing and building your own solutions. New to Java Question of the Week This book is for developers with more than a beginning level of Quizzes understanding of writing programs in the Java programming Tech Tips language. The example application is written with the Java® 2 Tutorials platform APIs and explained in terms of functional hows and whys, so if you need help installing the Java platform, setting up your Forums environment, or getting your first application to work, you should first read a more introductory book such as Essentials of the Java Programming Language: A Hands-On Guide or The Java Tutorial. -
Information Retrieval from Java Archive Format
Eötvös Loránd University Faculty of Informatics Department of Programming Languages and Compilers Information retrieval from Java archive format Supervisor: Author: Dr. Zoltán Porkoláb Bálint Kiss Associate Professor Computer Science MSc Budapest, 2017 Abstract During the course of my work, I contributed to CodeCompass, an open source code comprehension tool made for making codebase of software projects written in C, C++ and Java more understandable through navigation and visualization. I was tasked with the development of a module for recovering code information of Java classes in JAR files. This document details background concepts required for reverse- engineering Java bytecode, creating a prototype JAR file reader and how this solu- tion could be integrated to CodeCompass. First, I studied the structure of JAR format and how class files are stored in it. I looked into the Java Class file structure and how bytecode contained in class gets interpreted by the Java Virtual Machine. I also looked at existing decompilers and what bytecode libraries are. I created a proof-of-concept prototype that reads compiled classes from JAR file and extracts code information. I first showcased the use of Java Reflection API, then the use of Apache Commons Byte Code Engineering Library, a third-party bytecode library used for extracting and representing parts of Java class file as Java objects. Finally, I examined how CodeCompass works, how part of the prototype could be integrated into it and demonstrated the integration through parsing of a simple JAR file. i Acknowledgements I would like to thank Dr. Zoltán Porkoláb, Associate Professor of the Department of Programming Languages and Compilers at the Faculty of Informatics for admit- ting me to the CodeCompass project, supplying the thesis topic and helping with the documentation. -
IJIRT | Volume 2 Issue 6 | ISSN: 2349-6002
© November 2015 | IJIRT | Volume 2 Issue 6 | ISSN: 2349-6002 .Net Surbhi Bhardwaj Dronacharya College of Engineering Khentawas, Haryana INTRODUCTION as smartphones. Additionally, .NET Micro .NET Framework (pronounced dot net) is Framework is targeted at severely resource- a software framework developed by Microsoft that constrained devices. runs primarily on Microsoft Windows. It includes a large class library known as Framework Class Library (FCL) and provides language WHAT IS THE .NET FRAMEWORK? interoperability(each language can use code written The .NET Framework is a new and revolutionary in other languages) across several programming platform created by Microsoft for languages. Programs written for .NET Framework developingapplications. execute in a software environment (as contrasted to hardware environment), known as Common It is a platform for application developers. Language Runtime (CLR), an application virtual It is a Framework that supports Multiple machine that provides services such as Language and Cross language integration. security, memory management, and exception handling. FCL and CLR together constitute .NET IT has IDE (Integrated Development Framework. Environment). FCL provides user interface, data access, database Framework is a set of utilities or can say connectivity, cryptography, web building blocks of your application system. application development, numeric algorithms, .NET Framework provides GUI in a GUI and network communications. Programmers manner. produce software by combining their own source code with .NET Framework and other libraries. .NET is a platform independent but with .NET Framework is intended to be used by most new help of Mono Compilation System (MCS). applications created for the Windows platform. MCS is a middle level interface. Microsoft also produces an integrated development .NET Framework provides interoperability environment largely for .NET software called Visual between languages i.e. -
Comparative Studies of Programming Languages; Course Lecture Notes
Comparative Studies of Programming Languages, COMP6411 Lecture Notes, Revision 1.9 Joey Paquet Serguei A. Mokhov (Eds.) August 5, 2010 arXiv:1007.2123v6 [cs.PL] 4 Aug 2010 2 Preface Lecture notes for the Comparative Studies of Programming Languages course, COMP6411, taught at the Department of Computer Science and Software Engineering, Faculty of Engineering and Computer Science, Concordia University, Montreal, QC, Canada. These notes include a compiled book of primarily related articles from the Wikipedia, the Free Encyclopedia [24], as well as Comparative Programming Languages book [7] and other resources, including our own. The original notes were compiled by Dr. Paquet [14] 3 4 Contents 1 Brief History and Genealogy of Programming Languages 7 1.1 Introduction . 7 1.1.1 Subreferences . 7 1.2 History . 7 1.2.1 Pre-computer era . 7 1.2.2 Subreferences . 8 1.2.3 Early computer era . 8 1.2.4 Subreferences . 8 1.2.5 Modern/Structured programming languages . 9 1.3 References . 19 2 Programming Paradigms 21 2.1 Introduction . 21 2.2 History . 21 2.2.1 Low-level: binary, assembly . 21 2.2.2 Procedural programming . 22 2.2.3 Object-oriented programming . 23 2.2.4 Declarative programming . 27 3 Program Evaluation 33 3.1 Program analysis and translation phases . 33 3.1.1 Front end . 33 3.1.2 Back end . 34 3.2 Compilation vs. interpretation . 34 3.2.1 Compilation . 34 3.2.2 Interpretation . 36 3.2.3 Subreferences . 37 3.3 Type System . 38 3.3.1 Type checking . 38 3.4 Memory management . -
Diffsharp an AD Library for .NET Languages
DiffSharp An AD Library for .NET Languages Atılım Güneş Baydin1 Barak A. Pearlmutter2 Jeffrey Mark Siskind3 1University of Oxford [email protected] 2Maynooth University [email protected] 3Purdue University [email protected] http://www.robots.ox.ac.uk/~gunes/ AD2016, September 13, 2016 The .NET “ecosystem” Languages The main .NET languages: C#, F#, VB, C++/CLI Around 30 other (somewhat obscure) languages: F*, Eiffel, A#, ClojureCLR, IronPython, Nemerle, ... https://en.wikipedia.org/wiki/List_of_CLI_languages 1/18 C# Stack Overflow Developer Survey 2015 TIOBE Index, September 2016 http://stackoverflow.com/research/developer-survey-2015 http://www.tiobe.com/tiobe-index/ 2/18 F# An OCaml-based, strongly-typed, functional language, used in computational finance, machine learning Allows us to expose AD as a higher-order API accept first class functions as arguments return derivative functions, which can be arbitrarily nested //A scalar-to-scalar function let f x = sin (sqrt x) //2nd derivative off let f’’ = diff (diff f) // Evaluatef’’ at2 let d = f’’ 2. 3/18 Runtimes Previously: .NET Framework (Windows) and Mono (Linux, Mac OS) Since 27 June 2016: .NET Core 1.0 https://dotnet.github.io/ Open-source (MIT License) Cross-platform (Linux, Mac OS, Windows) 4/18 DiffSharp DiffSharp http://diffsharp.github.io/DiffSharp Deeply-embedded, higher-order, forward and reverse AD Support for nesting, currying High-performance matrix operations (using BLAS/LAPACK/CUDA) Implemented in F#, usable by all .NET languages (helper interface for C# and other procedural -
Java Class Annotation Example
Java Class Annotation Example Bud etherealizing her matriarch inimitably, unwavering and decayed. Antimonious and regulation Rog violated almost anywhere, though Saunderson tosses his Creon outdating. Which Roland disinhuming so ordinarily that Westleigh tooth her opposites? It is class to classes are pretty easy to reflection to list to catch, company or property to generate mock for? First method of java example. The java are given list of bibliography. Default annotations example, java code examples of the compiler to be applied to json. The new project for extracting information to create web sites without editions but i go into the annotated bibliography paper, we welcome to isolate the mechanics of using. Parsing the examples can be used from open source and. We will utilize the class analyzes the same type declaration etc at runtime reflection methods or evaluative lists the suite itself which are. Nice explanation about the front controller, we added and then issues a class of the information, management example demonstrates how can be executed and. There are working standalone spring boot application into system proposed here, because of annotations. Its annotations example annotation examples java. Hibernate does not to class or specify java example of fundamental never hurt or not. Read from java class acts as each article has been designed with examples select then we learned about? We made as classes that class or examples of annotation example classes or an earlier article example it tells spring. The table pointing back to interface. From java example is applied only contains a second argument. Junit provides a test cases, we want specific warnings and ideas into our newsletter for an understanding takt time in. -
Introduction to .NET, C#, and Visual Studio
Introduction to .NET, C#, and Visual Studio C# Programming January 8 Part I Administrivia Administrivia • When: Wednesdays 10–11am (and a few Mondays as needed) • Where: Moore 100B • This lab has Windows machines, but feel free to bring laptops • Office Hours: to be announced • Course webpage: http://www.seas.upenn.edu/~cse39905 Course Structure • No quizzes, no exams • Roughly 6 projects • Roughly 2 weeks per project • The final project will be slightly longer and more open-ended • Projects will be due at midnight on the night of the deadline • All assignments should be submitted through the Blackboard Digital Dropbox • Late policy: 15% off each day, up to 3 days late Final Project • Your chance to choose your own project • Brainstorming and planning will begin after spring break • Top projects will be entered into the Xtreme.NET Challenge – hopefully there will be 20 top projects :-) • First prize: Xbox 360! • Judges will include someone from Microsoft recruiting, maybe someone from the C# team • More details to come at http://www.seas.upenn.edu/~cse39905/xtreme Part II What is .NET? The Microsoft .NET Framework • .NET is a development platform that launched in 2000 • Goals include language independence, language integration, web services • Technologies to promote rapid development of secure, connected applications • .NET components include: • Languages (C#, VB, Visual C++, Visual J#, ...) • Common Language Runtime (CLR) • Framework Class Library (FCL) Common Language Runtime • A single runtime environment to execute programs written in any .NET language • Includes a virtual machine • Activates objects, manages memory, performs security checks, collects garbage • To run on the CLR, a language must adhere to a Common Language Specification (CLS) • A language must also build upon base types specified in the Common Type System (CTS) Languages • Language compilers translate source into Microsoft Intermediate Language (MSIL). -
Java and C I CSE 351 Autumn 2016
L26: JVM CSE351, Spring 2018 Java Virtual Machine CSE 351 Spring 2018 Model of a Computer “Showing the Weather” Pencil and Crayon on Paper Matai Feldacker-Grossman, Age 4 May 22, 2018 L26: JVM CSE351, Spring 2018 Roadmap C: Java: Memory & data Integers & floats car *c = malloc(sizeof(car)); Car c = new Car(); x86 assembly c->miles = 100; c.setMiles(100); c->gals = 17; c.setGals(17); Procedures & stacks float mpg = get_mpg(c); float mpg = Executables free(c); c.getMPG(); Arrays & structs Memory & caches Assembly get_mpg: Processes language: pushq %rbp Virtual memory movq %rsp, %rbp ... Memory allocation popq %rbp Java vs. C ret OS: Machine 0111010000011000 code: 100011010000010000000010 1000100111000010 110000011111101000011111 Computer system: 2 L26: JVM CSE351, Spring 2018 Implementing Programming Languages Many choices in how to implement programming models We’ve talked about compilation, can also interpret Interpreting languages has a long history . Lisp, an early programming language, was interpreted Interpreters are still in common use: . Python, Javascript, Ruby, Matlab, PHP, Perl, … Interpreter Your source code implementation Your source code Binary executable Interpreter binary Hardware Hardware 3 L26: JVM CSE351, Spring 2018 An Interpreter is a Program Execute (something close to) the source code directly Simpler/no compiler – less translation More transparent to debug – less translation Easier to run on different architectures – runs in a simulated environment that exists only inside the interpreter process . Just port the interpreter (program), not the program-intepreted Slower and harder to optimize 4 L26: JVM CSE351, Spring 2018 Interpreter vs. Compiler An aspect of a language implementation . A language can have multiple implementations . Some might be compilers and other interpreters “Compiled languages” vs. -
Hibernate Tools
APPENDIX A ■ ■ ■ More Advanced Features In this appendix, we discuss some of the features that, strictly speaking, lie outside the scope of this book, but that you should be aware of if you go on to use Hibernate in more depth. Managed Versioning and Optimistic Locking While we have saved versioning for this appendix’s discussion of advanced features, it is actually quite straightforward to understand and apply. Consider the following scenario: • Client A loads and edits a record. • Client B loads and edits the same record. • Client A commits its edited record data. • Client B commits its differently edited record data. While the scenario is simple, the problems it presents are not. If Client A establishes a transaction, then Client B may not be able to load and edit the same record. Yet in a web environment, it is not unlikely that Client A will close a browser window on the open record, never committing or canceling the transaction, so that the record remains locked until the session times out. Clearly this is not a satisfactory solution. Usually, you will not want to permit the alternative scenario, in which no locking is used, and the last person to save a record wins! The solution, versioning, is essentially a type of optimistic locking (see Chapter 8). When any changes to an entity are stored, a version column is updated to reflect the fact that the entity has changed. When a subsequent user tries to commit changes to the same entity, the original version number will be compared against the current value—if they differ, the commit will be rejected. -
Using Other Tools with Jython
A P P E N D I X A Using Other Tools with Jython The primary focus of this appendix is to provide information on using some external Python packages with Jython, as well as providing information regarding the Jython registry. In some circumstances, the tools must be used or installed a bit differently on Jython than on CPython, and those differences will be noted. Because there is a good deal of documentation on the usage of these tools available on the web, this appendix will focus on using the tool specifically with Jython. However, relevant URLs will be cited for finding more documentation on each of the topics. The Jython Registry Because there is no good platform-independent equivalent of the Windows Registry or Unix environment variables, Java has its own environment variable namespace. Jython acquires its namespace from the following sources (later sources override defaults found in earlier places): • The Java system properties, typically passed in on the command line as options to the java interpreter. • The Jython “registry” file, containing prop=value pairs. Read on for the algorithm Jython uses to find the registry file. • The user’s personal registry file, containing similarly formatted prop/value pairs. The user’s registry file can be found at "user.home"+"/.jython" • Jython properties specified on the command line as options to the Jython class. See the -D option to the interpreter. Registry Properties The following properties are recognized by Jython. There may be others that aren’t documented here; consult the comments in registry file for details. python.cachedir The directory to use for caches—currently just package information. -
Reversing Java (Malware) with Radare
Reversing Java (Malware) with Radare Adam Pridgen April 2014 About me • Rice SecLab, a PhD Student • Independent InfoSec Consultant/Contractor Overview • Typical Java Reversing Talk o Decompile Code o Make Changes o Recompile and Win? • Java Malware: Fail! Overview Has this happened to you? Overview • IDA Pro 6.4 does not include meta-data Overview ● Malicious code analysis is hard ● Relevant information is key ● Tools assume code is complete or correct Overview ● Reversing JVM Bytecode viewed as a “simple” problem ○ Until you need to actually do it ○ Or you need to extract some type of information ● Too Long Didn’t Listen (tldl;) ○ Radare now supports basic class file manipulations ○ Hooking by rewriting class and method names ○ Manipulation of Access Flags ○ Inserting values in constant pool ○ More detailed inspection of files Multiple Command Extendible Multi-Language Architectures Based Components w/ Ctypes Open Source IL in progress Cross 2048 Platform Supports IO GDB Interface Hex Editor Web UI Layers Agenda • Discuss Java Class File and Format • Discuss Java Malware and Obfuscation • Introduce Java Reversing with Radare • Discuss Some Techniques • Conclude with Future Work Java Overview JVM Bytecode • ~203 Operations • Fairly easy to disassemble o Except for the built in “switch-tables” • JVM is Stack Based • Local Variables are stored in a local variable position JVM Bytecode • Caller copy the entire thread stack to caller • JVM resolves Class Name, Method Name, and argument types • Types are not important until they are important