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Developing With LArSoft » History » Version 87

Gianluca Petrillo, 09/26/2017 05:33 PM

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h1(count). Developing With LArSoft
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h2(count). Quick links for Developing with LArSoft
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* " LArSoft repositories packages and dependencies ":https://cdcvs.fnal.gov/redmine/projects/larsoft/wiki/_LArSoft_repositories_packages_and_dependencies_
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* "Concepts in LArSoft":http://larsoft.org/important-concepts-in-larsoft/
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h2(count). Designing
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To design LArSoft code, it's important to understand the core LArSoft suite and all the components used by it. Reference the items below when designing new software.
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h3(count). LArSoft architecture and design principles
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* "Latest architecture document as PDF download":https://cdcvs.fnal.gov/redmine/projects/larsoft-architecture/repository/revisions/master/raw/output/LArSoftArchitecture.pdf
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* "Design principles on larsoft.org":http://larsoft.org/important-concepts-in-larsoft/design/
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h3(count). LArSoft packages and repositories
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  * [[ LArSoft repositories, packages and dependencies ]]
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  * [[Geometry Package]]
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h3(count). The _art_ framework
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  * "_art_ documentation on WordPress":http://art.fnal.gov for general information 
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  * "_art_ documentation in Redmine":https://cdcvs.fnal.gov/redmine/projects/art/wiki for code specific information
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  * "_art_ workbook":http://art.fnal.gov/art-workbook/ for examples and tutorials
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  * [[Using art in LArSoft]]
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h3(count). _gallery_
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_gallery_ provides lightweight access to event data in art/ROOT files outside the art event processing framework executable. It is not an alternative framework; rather, it provides a library that can be used to write programs that need to read (but not write) art/ROOT files. Information is available at: http://art.fnal.gov/gallery/
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h3(count). External packages
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These are package written and maintained by the general physics and computing communities for 
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|_.Package|_.Namespace|_.Short description|_.Location of headers|
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|"C++":http://www.cplusplus.com/reference/|@std::@|\2. Extensions to base C++ that are part of the standard language|
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|"ROOT":https://root.cern.ch|See below|Data-analysis tools|@$ROOT_INC@|
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|"CLHEP":http://proj-clhep.web.cern.ch/proj-clhep/|@CLHEP::@|Class Library for High-Energy Physics|@$CLHEP_INC/CLHEP@|
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|"Geant4":http://geant4.web.cern.ch/geant4/|See below|Detector simulations|@$G4INCLUDE@|
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|"GENIE":http://www.genie-mc.org/|@genie::@|Neutrino Monte-Carlo Generator|@$GENIE_INC/GENIE@|
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|"boost":http://www.boost.org/|@boost::@|General programming tools for C++|@$BOOST_INC/boost@|
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|[[messagefacility:|Message Facility wiki documentation]]|@mf::@|Service for console messages|@$MESSAGEFACILITY_INC@|
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|[[art:wiki#Job-configuration|FHiCL Configuration]]|@fhicl::@|Configuration language and parsing tools|@$FHICLCPP_INC@|
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|[[NuSoft and LArSoft|nutools and LArSoft]]|@simb::@ ...|Neutrino platform tools|@$NUTOOLS_INC@|
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ROOT and Geant4 do not use namespaces. In general, ROOT classes begin with "T" (e.g., "TTree":http://root.cern.ch/root/html522/TTree.html, "TH1":http://root.cern.ch/root/html522/TH1.html) while "Geant4 classes":http://geant4www.triumf.ca/lxr/ begin with "G4" (e.g., "G4Track":http://geant4www.triumf.ca/lxr/source//track/include/G4Track.hh, "G4Step":http://geant4www.triumf.ca/lxr/source//track/include/G4Step.hh). Exception: Some of the newer ROOT sub-packages have namespaces (such as @ROOT::Math::@, @ROOT::Fit::@, @ROOT::Minuit2::@, @Reflex::@, @TMVA::@).
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Some of these packages duplicate functionality; e.g., 4-vectors are implemented in both "ROOT":http://root.cern.ch/root/html522/TLorentzVector.html and "CLHEP":http://proj-clhep.web.cern.ch/proj-clhep/doc/CLHEP_2_1_2_2/doxygen/html/LorentzVector_8h.html. Given a choice, use a package that's higher in the above tables over one that's lower; e.g., choose ROOT classes over their CLHEP equivalents.
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h2(count). Writing code
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Whether you are writing new code or modifying existing code, please follow the guidelines listed below. There are also development tools and techniques available that can make coding easier.
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h3(count). Guidelines
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# [[The rules and guidelines|Coding guidelines]]
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# [[Code documentation requirements and guidelines]]
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# [[Process for contributing code to LArSoft]]
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# [[Writing LArSoft service|Guidelines on writing (and using) services in LArSoft]] _(in general)_
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# [[Writing LArSoft algorithms|Guidelines on writing (and using) algorithms in LArSoft]] _(not specific to any algorithm)_
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# [[Guidelines on using the geometry]]
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# [[LArSoft examples|Examples!]]
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# [[Some C++ good practices|some C++ suggestions]]
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---
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h3(count). How to...
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* ... [[Use associations|create and use associations]]
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* ... [[From_ROOT_vectors_(TVector3)_to_ROOT_GenVector|use the new ROOT vectors and linear algebra classes in the code]] (GenVector, SMatrix)
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---
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h3(count). [[Tips on updating your code after LArSoft release]]
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---
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h3(count). Tools and techniques
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h4(count). Documenting and browsing code
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* "LArSoft Doxygen":http://nusoft.fnal.gov/larsoft/doxsvn/html/index.html - comments in the code are incorporated into documentation using "the Doxygen tool.":http://www.stack.nl/~dimitri/doxygen/manual/docblocks.html
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* "LXR Cross Referencer":http://cdcvs.fnal.gov/lxr/ -  general purpose source code indexer and cross-referencer that provides web-based browsing of source code with links to the definition and usage of any identifier. Supports multiple languages. Includes LArSoft code. Note, pages may take several seconds to load.
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h4(count). git and git flow
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* [[LArSoft_git_Guidelines|git guidelines]]
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* [[cet-is-public:git flow quick start]]
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* [[cet-is-public:GitTipsAndTricks|Git Tips and Tricks]]
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_(for the purposes of LArSoft development, please please ignore anything other than how to use various git commands to do specific tasks - and especially ignore the workflow advices)_
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h4(count). Profiling
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* [[memory profiling tools]]
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* [[time profiling tools]]
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* [[profiling utilities]]
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h4(count). Debugging
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* [[Debugging LArSoft with Allinea]] 
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* [[Debugging LArSoft]] with RogueWave TotalView. (*TotalView is no longer being paid for. Please use Allinea above instead.*)
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* [[Debugging with gdb]]
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---
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h2(count). Building
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h3(count). Using the build system
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  * *[[Quick Links|Look for experiment specific guides to using and developing LArSoft code ]]*
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  *  Choose the correct release from the [[LArSoft release list|List of LArSoft Releases and Release Notes]]. 
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  * [[UpdatingToNewRelease|What to do when there is a new release ]] (a.k.a. **[[UpdatingToNewRelease|update LArSoft version]]**)
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To get write access to the repositories, speak to the offline coordinator for your experiment. If you have a question, send email to larsoft-team@fnal.gov.
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h3(count). Understanding CMakeLists.txt and product_deps files
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* [[cet-is-public:Cetbuildtools cmake modules]]:  such as @cet_make@ and @cet_add_compiler_flags@. Used in @CMakeLists.txt@ files throughout LArSoft
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* [[cet-is-public:Art cmake modules]]: such as @art_make@ and @simple_plugin@. Used in @CMakeLists.txt@ files throughout LArSoft
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* [[cet-is-public:Defining products in the CET build environment]]: explains the @product_deps@ file
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* [[cet-is-public:AddingProductDependencies|Adding Product Dependencies]]: how to edit the @product_deps@ and @CMakeLists.txt@ files to add dependencies
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* [[cet-is-public:CodeTips|Various helpful tips for coding in the CET C++ environment]]: things you hope you never need to know
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* [[cet-is-public:Building your own code with cmake]]:  pointer to a _really_ simple example
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h3(count). mrb (multi-repository build) tool
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* "mrb user guide":https://cdcvs.fnal.gov/redmine/projects/mrb/wiki/MrbUserGuide
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* "mrb reference guide":https://cdcvs.fnal.gov/redmine/projects/mrb/wiki/MrbRefereceGuide
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* "Documentation for buildtool":https://cdcvs.fnal.gov/redmine/projects/cet-is-public/wiki/Buildtool_script
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** mrb calls @buildtool@ (from the @cetbuildtools@ product) to perform the build. 
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h3(count). ups
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* "Getting Started with UPS":https://cdcvs.fnal.gov/redmine/projects/ups/wiki/Getting_Started_Using_UPS and "About UPS":https://cdcvs.fnal.gov/redmine/projects/cet-is-public/wiki/AboutUPS 
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* [[cet-is-public:AboutQualifiers|About qualifiers]]:  the things after "-q" in setup <prod> <ver> -q <qual>
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* "More Relocatable UPS Documentation":https://cdcvs.fnal.gov/redmine/projects/ups/wiki/Documentation
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h2(count). Testing
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High-level description of testing is available at "larsoft.org":http://larsoft.org/larsoft-testing/
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h3(count). LArSoft Continuous Integration (CI) system
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  * "High-level description of CI":http://larsoft.org/continuous-integration/
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  * "CI results display page":http://lar-ci-history.fnal.gov/LarCI/app
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  * [[lar_ci:| LAr-Continuous-Integration subproject wiki]]
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h2(count). Submitting for next release
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After designing, coding, building and testing a piece of software, submit it to the LArSoft development branch so it is included in a new release.
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* [[Getting new code into a LArSoft release]]  _(Procedures and policies for making changes to LArSoft releases)_
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Also look at  [[Process for contributing code to LArSoft]].