GemTools Smalltalk Browser for MagLev

GemTools is a Smalltalk Development environment that can be used to view the Smalltalk source code built into the MagLev image. You can view the same information with Topaz (the built-in command line debugger/inspector), but GemTools provides a nice GUI for interacting with the image.

The GemTools download includes everything you need to run Pharo Smalltalk on Linux and OSX.

Install GemTools

  1. Download GemTools-1.0-beta.8.7-310x
  2. Unzip the archive. You should have a directory named

    OSX users may want to move it to /Applications.

Run GemTools

  1. Ensure the MagLev stone is running:

    $ cd $MAGLEV_HOME
    $ rake maglev:start
  2. Ensure a netldi process is running:

    $ cd $MAGLEV_HOME
    $ rake netldi:start
  3. Start GemTools

    OSX users can either open or open it from the Finder as a normal OSX app.

    Linux users can run

  4. Connect to MagLev

    After the Pharo Smalltalk process opens, you’ll need to connect to the MagLev stone. To do that, select “MagLev” in the GemTools Launcher window, and then click “Login”.

    The first time you login, you’ll be asked for your first and last name. This allows the Monticello source code system to know who is making changes (just like adding your user info into ~/.gitconfig).

Browse some source code

After you’ve logged into the image, you can look at some MagLev code by:

  1. Click the “Find…” button
  2. Select “Hierarchy browser”
  3. Enter “Kernel” into the dialog and hit enter (or click “Ok”).

You can explore the source code from here.

Sharing netldi between Smalltalk and MagLev

If you are a GemStone/S Smalltalk user, and would like Smalltalk and MagLev to use the same locks directory (one netldi to rule them all), then run $MAGLEV_HOME/