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  • How are generics implemented?

    - by greenoldman
    This is the question from compiler internals perspective. I am interested in generics, not templates (C++), so I marked the question with C#. Not Java, because AFAIK the generics in both languages differ in implementations. When I look at languages w/o generics it is pretty straightforward, you can validate the class definition, add it to hierarchy and that's it. But what to do with generic class, and more importantly how handle references to it? How to make sure that static fields are singular per instantiations (i.e. each time generic parameters are resolved). Let's say I see a call: var x = new Foo<Bar>(); Do I add new Foo_Bar class to hierarchy? Update: So far I found only 2 relevant posts, however even they don't go into much details in sense "how to do it by yourself": http://www.jprl.com/Blog/archive/development/2007/Aug-31.html http://www.artima.com/intv/generics2.html

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  • InvalidProgramException Running Unit Test

    - by Anthony Trudeau
    There is a bug in the unit testing framework in Visual Studio 2010 with unit testing.  The bug appears in a very special circumstance involving an internal generic type. The bug causes the following exception to be thrown: System.InvalidProgramException: JIT Compiler encountered an internal limitation. This occurs under the following circumstances: Type being tested is internal or private Method being tested is generic  Method being tested has an out parameter Type accessor functionality used to access the internal type The exception is not thrown if the InternalsVisibleToAttribute is assigned to the source assembly and the accessor type is not used; nor is it thrown if the method is not a generic method. Bug #635093 has been added through Microsoft Connect

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  • Providing feedback on the Solaris Studio 12.4 Beta

    - by Darryl Gove
    Obviously, the point of the Solaris Studio 12.4 Beta programme was for everyone to try out the new version of the compiler and tools, and for us to gather feedback on what was working, what was broken, and what was missing. We've had lots of useful feedback - you can see some of it on the forums. But we're after more. Hence we have a Solaris Studio 12.4 Beta survey where you can tell us more about your experiences. Your comments are really helpful to us. Thanks.

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  • How do .so files avoid problems associated with passing header-only templates like MS dll files have?

    - by Doug T.
    Based on the discussion around this question. I'd like to know how .so files/the ELF format/the gcc toolchain avoid problems passing classes defined purely in header files (like the std library). According to Jan in that answer, the dynamic linker/loader only picks one version of such a class to load if its defined in two .so files. So if two .so files have two definitions, perhaps with different compiler options/etc, the dynamic linker can pick one to use. Is this correct? How does this work with inlining? For example, MSVC inlines templates aggressively. This makes the solution I describe above untenable for dlls. Does Gcc never inline header-only templates like the std library as MSVC does? If so wouldn't that make the functionality of ELF described above ineffective in these cases?

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  • Catching typos or other errors in web-based scripting languages

    - by foreyez
    Hi, My background is mainly strongly typed languages (java, c++, c#). Having recently gotten back to a bit of javascript, I found it a bit annoying that if I misspell something by accident (for example I'll type 'myvar' instead of 'myVar') my entire script crashes. The browser itself most of the time doesn't even tell me I have an error, my program will just be blank, etc. Then I have to hunt down my code line by line and find the error which is very time consuming. In the languages I am used to the compiler lets me know if I made a typo. My question to you is, how do you overcome this issue in scripting (javascript)? Can you give me some tips? (this question is mainly aimed at people that have also come from a strongly typed language). Note: I mainly use the terminal/VIM ... this is mainly b/c I like terminal and I SSH alot too

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  • What open source POSIX compliance test suites are available?

    - by Richard Pennington
    I'm working on a small open source project, ELLCC, that uses clang/LLVM as a cross compiler for various target processors. For the runtime environment, I'm using the NetBSD libraries and porting them to target Linux and standalone systems. I want to run a POSIX compliance test suite on the code. I've found the Open POSIX Test Suite, which looks like a good start, but it hasn't been updated since 2005. I've done some preliminary testing (with gcc and ecc under Linux), and it looks like it needs a few updates for modern compilers. My questions are: Does the Open POSIX Test Suite live on somewhere in a more up to date form? Are there other open source alternatives?

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  • MonoDroid est disponible gratuitement en version test, la version finale du portage de Mono sur Android sera payante

    MonoDroid est disponible gratuitement, en version de test avant la mouture finale payante Mise à jour du 06.01.2011 par Katleen En mars dernier, nous vous parlions déjà du projet MonoDroid (voir news précédente), cet outil dont le but est de permettre aux développeurs de travailler sur .Net depuis Android (et sous d'autres systèmes pour ses autres versions) grâce à une totale disponibilité pour eux des APIs de l'OS de Google. Sa preview était très attendue. Figurez-vous que la voici, enfin. Elle permet d'utiliser les librairiesOpenGL et OpenTK et de compiler du code à la volée (en cas de code natif). Elle offre également un kit de développement complet en ligne de commande (compatible...

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  • Débat : Comment se préparer à participer à un projet Open Source important comme par exemple le serv

    Bonjour, Pour quelques besoins que j'ai de passage rapide en JEE 6, et parce que je pense que l'expérience est intéressante, je crois devoir intervenir sur le code source de Glassfish v3, encore jeune. Mais il y a loin de la coupe aux lèvres. Et si j'ai pu télécharger l'environnement et le compiler pour me faire ma propre distribution binaire, cela ne fait certainement pas de moi un développeur digne d'intégrer une communauté constituée de membres solides. Ceux-là n'ont pas à se perdre avec de nouveaux arrivants, néophytes, qui adopteraient par leur méconnaissance des comportements brutaux. C'est bien ce que je veux éviter. Le projet Glassfish est important, il est sur java.net. Mais d'autres tout aussi ambitieux exis...

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  • How do I balance program CPU reverse compatibility whist still being able to use cutting edge features?

    - by TheLQ
    As I learn more about C and C++ I'm starting to wonder: How can a compiler use newer features of processors without limiting it just to people with, for example, Intel Core i7's? Think about it: new processors come out every year with lots of new technologies. However you can't just only target them since a significant portion of the market will not upgrade to the latest and greatest processors for a long time. I'm more or less wondering how this is handled in general by C and C++ devs and compilers. Do compilers make code similar to if SSE is supported, do this using it, else do that using the slower way or do developers have to implement their algorithm twice, or what? More or less how do you release software that takes advantage of newer processor technologies while still keeping a low common denominator?

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  • Which are the most frequent exceptions thrown in Java applications? [on hold]

    - by Chris
    1. Do you know of any statistics about the frequency of exceptions (checked and unchecked) thrown at runtime in typical Java applications? for example: NullPointerException: 25% of all exceptions ClassCastException: 15% of all exceptions etc. 2. Which are the most frequent exceptions according to your own experiences? 3. Would you agree that the NullPointerException is generally the most often thrown exception? I am asking this question in the context of the compiler development of the PPL programming language (www.practical-programming.org). The goal is to auto-detect a maximum of frequent exceptions at compile-time. For example, detecting all potential NullPointerExceptions at compile-time leads to null-safe software which is more reliable.

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  • Google Dart vs CoffeeScript? Which one should one learn?

    - by garbage collection
    I was thinking about learning CoffeeScript some time in the future. In the mean time, Google came out with Dart that seems to do what CoffeeScript does. Google says: Dart code can be executed in two different ways: either on a native virtual machine or on top of a JavaScript engine by using a compiler that translates Dart code to JavaScript. This means you can write a web application in Dart and have it compiled and run on any modern browser. Does anyone know advantages and disadvantages of learning Dart or CoffeeScript?

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  • [News] C# V5 s'oriente vers la m?ta-programmation

    Alors que C# V4 vient tout juste de sortir en release, les ?quipes de Microsoft planchent d?j? sur C# V5. On ne sait pas grand chose sur C# V5 ? part que Microsoft souhaite en faire une sorte de langage permettant de g?n?rer du code ? la compilation et ? l'ex?cution (un peu comme le ferait un langage dynamique). Cette fonctionnalit? aurait de nombreux domaines d'application, notamment la programmation par contrat ou la d?sormais fameuse programmation orient?e aspect. Patrick Smacchia en parle dans un r?cent billet et pointant ?galement les travaux du projet Mono dans ce domaine. Apr?s le "Software As A Service", voici le "Compiler As The Service".

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  • What is the value of a let expression

    - by Grzegorz Slawecki
    From what I understand, every code in f# is an expression, including let binding. Say we got the following code: let a = 5 printfn "%d" a I've read that this would be seen by the compiler as let a = 5 in ( printfn "%d" a ) And so the value of all this would be value of inner expression, which is value of printf. On the other hand, in f# interactive: > let a = 5;; val a : int = 5 Which clearly indicates that the value of let expression is the value bound to the identifier. Q: Can anyone explain what is the value of a let expression? Can it be different in compiled code than in F# interactive?

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  • MonoDroid est disponible gratuitement, en version de test avant la mouture finale payante

    MonoDroid est disponible gratuitement, en version de test avant la mouture finale payante Mise à jour du 06.01.2011 par Katleen En mars dernier, nous vous parlions déjà du projet MonoDroid (voir news précédente), cet outil dont le but est de permettre aux développeurs de travailler sur .Net depuis Android (et sous d'autres systèmes pour ses autres versions) grâce à une totale disponibilité pour eux des APIs de l'OS de Google. Sa preview était très attendue. Figurez-vous que la voici, enfin. Elle permet d'utiliser les librairiesOpenGL et OpenTK et de compiler du code à la volée (en cas de code natif). Elle offre également un kit de développement complet en ligne de commande (compatible...

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  • How to obtain window handle in SDL 2.0.3

    - by Diorthotis
    I need to obtain the handle of the window for SDL 2.0.3. I got the suggestion to use info.window after initializing SDL and filling the info variable with data by calling SDL_GetWindowWMInfo(); included in the header file SDL_syswm.h. My compiler (visual studio 2008 professional edition) gives the following error: 226) : error C2039: 'window' : is not a member of 'SDL_SysWMinfo' 1 include\sdl_syswm.h(173) : see declaration of 'SDL_SysWMinfo' Any help appreciated. Thanks. Nevermind, I needed to use "info.info.win.window". That seems a bit redundant, but whateves.

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  • Terra lang and Lua

    - by msalese
    I was reading on terralang site about terra language as "a new low-level system programming language that is designed to interoperate seamlessly with the Lua programming language..." Zach DeVito (the main author) write about the use of terra : A scripting-language with high-performance extensions..... An embedded JIT-compiler for building languages..... A stand-alone low-level language.... But (may be my fault) I don't understand if terra is: a luaJit competitor a better system to interface with c library something better than luaJit using llvm Can someone help me to better understand what is going on terralang project ? Thanks

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  • How many CISC instructions do compilers use?

    - by Euphoric
    CISC processors have sometimes huge instruction sets. This makes assembly programming somehow easier. But it reduces overall effectivness of the whole chip. But how many of those instructions are used by modern compilers? I'm especialy interested in relation of CISC vs. RISC where in CISC, compiler can use specialised instructions, that might increase effectivness. But do compilers use those instructions? If yes, then how many of them are used?

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  • To use Dart, the Java programmer has to work with 2 languages? [closed]

    - by Sridhar-Sarnobat
    When deciding on a technology to use for web apps, it's become a difficult choice between GWT and Dart and I am looking for guidance in deciding. GWT is a java programmer's dream because they don't have to learn a new language or have to worry about a separate IDE or extra plugin etc. GWT was sold using this value proposition - one didn't need to program in Javascript. But are Google making a U-turn and saying "go through the hassle of learning a new language" afterall? Or is it intended for there to be a Java to Dart compiler so that Java developers do not have to learn a new language? (this is not a rant, so I don't know why you are down-voting the question) Note: "the syntax is very similar" is not a justification. You could say why bother with GWT and just work with Java + Javascript directly.

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  • Develop a small size software using C only for copying same data to multiple external drives simultaneously [on hold]

    - by VSP
    I want to develop a software that can copy the same data to multiple external drives, simultaneously. For example, consider a file Movie and I have 3 external drives to copy it to, and I want to copy Movie to all these 3 drives(these drives can be flash storage or external hard-disk or pen-drive etc. but have one thing in common, i.e. they are all external drives) at the same time, means when I right-click on Movie there has to be 1 option saying Copy to All Drives. It's a sort of mini-project and I want to use C language only. For starting I would like it to work only on Windows OS. What are the requirements of developing this software (not the system requirements but what will I need to develop such a software, like editor,compiler etc.)? I know this type of software must have already been developed but I want to use C language and C Language only. So, is it possible to develop such a software?

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  • ultrasn0w Unlocks iOS 4.2.1

    - by Gopinath
    iPhone dev team who always succeeds in jailbreaking  iPhones and other iOS devices has done it again. They are able to unlock all iPhones running on iOS 4.2 except iPhone 4. MuscleNerd, a member of iPhone Dev team tweeted Finally got ultrasn0w working fully on 4.2.1. Apple inadvertently(!) broke ultrasn0w via aggressive compiler optimization The jailbreak tool for iPhone 3G and iPhone 3GS will be released soon(may be tomorrow) even though they are still trying to figure out a way to unlock iPhone 4. Read more details on this at dev team blog. This article titled,ultrasn0w Unlocks iOS 4.2.1, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Is there a way to continue a partially finished MinGW build?

    - by vsz
    I am just trying to become familiar with MinGW (and with more complex command-line compiler tools) I have a really giant project to build, I successfully managed to generate the makefile with CMake, and started mingw. After more than an hour of hard work, and building dozens of libraries successfully, the build ended in an error. It seems I added an option in CMake which is not supported in my system. My problem is, I cannot figure out a way to just skip that library and continue with the build process. If I remove the option in CMake and start mingw again, it starts from the beginning and rebuilds everything, even those libraries which are already built.

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  • In the absense of a CS degree, how can I "fill in the gaps" so to speak?

    - by Richard DesLonde
    The problem here is that "I don't know what I don't know". How can I fill in those gaps? What is it that a computer science degreed person will know that I don't? Note: This isn't a personal question. I'm not asking you to read my mind so you can tell me where my knowledge is lacking. I'm really asking "Where/how can I get the knowledge a computer science degree would give me, without getting one?" Example: I don't know anything about compilers, but I understand that comp sci majors often are required to write some sort of compiler. This seems like something that would be useful to know. Etc.

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  • Dart Package Management with Pub

    Dart Package Management with Pub Pub is the package manager for Dart. With pub, you can manage libraries and dependencies for your Dart apps. This video shows you an early preview of pub and gives a demo of a Dart app with 3rd party libraries installed by the pub command line. Dart is a new structured web programming language, libraries, and virtual machine. Dart works across the modern web, thanks to its Dart to JavaScript compiler. You can try Dart, and pub, today at www.dartlang.org From: GoogleDevelopers Views: 2 0 ratings Time: 03:47 More in Science & Technology

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  • Override a static library's global function

    - by Jason Madux
    Not sure if this question belongs here or on SO, but posting here for now :) I'm trying to override a global function defined in "StaticLib" for my iOS application but the compiler keeps giving me the duplicate symbol error. Relevant code: #import "MyApplication.h" #import "StaticLib.h" NSData* getAllData() { NSLog(@"myGetAllData"); return nil; } @implementation MyApplication ... @end I've looked into Apple's runtime library but that all seems to be class-oriented. Any suggestions or is it just not possible to override global functions from static libraries?

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  • How to flag a class as under development in Java

    - by Usavich
    I'm working on a internship project, but I have to leave before I can finish up everything. I have 1 class that is not stable enough for production use. I want to mark/flag this class so that other people will not accidentally use it in production. I have already put the notice in Javadoc, but that doesn't seem enough. Some compiler error or warning would be better. The code is organized like this: [Package] | company.foo.bar.myproject |-- Class1.java |-- Class2.java |-- Class3.java <--(not stable) If there was a single factory class that calls those classes in public methods, I could have set the method to class3 as private. However the API is NOT exposed that way. Users will directly use those class, e.g. new Class1();, but I can't make a top-level class private. What's the best practice to deal with this situation?

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