Category Archives: data structures

Data visualization is the discipline of trying to understand data information by placing it in a visual context so that patterns and trends that might not be detected easily will appear. In this article I will describe step by step how to create a visualization using Roassal30 in a beginner friendly way. In addition weContinue reading “Creating a new visualization in Roassal”

In this post, I will explain what is a transmission, a transformation and how to have custom transmissions in the Pharo Inspector. We will show how transmissions are used in the inspector with a soccer database analysis tool that you can find at https://github.com/akevalion/Futbol/. We used this application because we needed a real domain toContinue reading “Custom transmissions in the Inspector”

To work on Pharo’s virtual machine, you’ll need to set up both the virtual machine you’ll be modifying, as well as a Pharo image. Below are the instructions required to set up the environment. You will need both the VM and the image containing the VM compilation chain (VMMaker package). Building the Pharo VM CloneContinue reading “Setting up your environment for working on the Pharo VM”

Imagine that you want to find a specific expression and that you want to find it in the complete system. How many classes would you have to look for? How can you be sure that you did not miss any class and being sure that you won’t be frustrated because of the number of issuesContinue reading “What is RBParseTreeSearcher ?”

In this post we will see how to use custom styles in Spec applications. We will start to present styles and then build a little editor as the one displayed hereafter. We will show that an application in Spec manages styles and let you adapt the look of a presenter. How do styles work? StylesContinue reading “Using styles in Spec applications”

In this post I am going to show you how to call external functions from a Pharo image. Here, we are going to use the LAPACK (Linear Algebra Package) library that is written in Fortran. Why do we need this library? In the Pharo AI project (https://github.com/pharo-ai), we are working on an implementation of linearContinue reading “Binding an external library into Pharo”

The other day we were working on the compiler detection of hotspots, originally implemented by Clément Béra during his PhD thesis. In Sista, hotspot detection is implemented as a countdown that looks like the following: the counter is loaded in a register, decremented and then a jump if carry detects if the substraction underflowed. WeContinue reading “Debugging the JIT compiler Hotspot detection for ARM64”

One of the improvements that we are including in Pharo 9 is the update of the build process in OpenBuildService. This service allows us to produce packages for different distributions of Linux. These pacakges are built using the versions loaded in the distribution and they can be installed and updated using the tools present inContinue reading “Installing Pharo in Linux using the System Package Manager”

For a couple of years now, Pharo includes support for Ephemerons, originally introduced with the Spur memory manager written by Eliot Miranda. For the upcoming Pharo 9.0 release, we have stressed the implementation (with several hundred thousands Ephemerons), make it compatible with latest changes done in the old space compaction algorithm, and made it aContinue reading “A Taste of Ephemerons”

Did you ever want to get the value of an expression each time you navigate the debugger stack? This is what we will show in this tutorial: you’ll learn how to implement a new extension for the StDebugger in Pharo9.0: the ‘Expression Evaluator StDebugger Extension’ (or simply EvaluatorDebugger for short) – that allows the evaluationContinue reading “Debugger Extensions in Pharo 9.0”