• Pull and build Treehydra if you haven't already.
• The sqlite3 tool. (On Linux, this should be provided by your distro.)

Pulling the source

To download the Callgraph scripts from the Mercurial repository:

cd $HOME
hg clone http://hg.mozilla.org/rewriting-and-analysis/callgraph

Building

Assuming your gcc and treehydra are in the locations suggested in the installation instructions, invoke the callgraph script via

cd $HOME/callgraph
#./callgraph.sh path/to/plugin/enabled/gcc path/to/treehydra
./callgraph.sh $HOME/gcc-dehydra/installed/bin $HOME/gcc-dehydra/dehydra

The callgraph script will do the following:

• hg clone mozilla-central for you the first time it's run. (The tree is stored under $HOME/callgraph/mozilla-central/mozilla.) After that, it's up to you to hg pull -u when you want to update it.
• Build the tree, using the callgraph analysis script. The mozconfig used for this is $HOME/callgraph/mozconfig; the objdir is $HOME/callgraph/mozilla-central/obj-fx. Each object file produced by gcc and g++ in the tree will have a corresponding plaintext .sql file, containing sqlite INSERT statements to build the database.
• Construct the database, by aggregating the .sql files and running them through sqlite. This data goes into $HOME/callgraph/db/graph.sqlite, which can be inspected using sqlite3. (Documentation for the sqlite syntax can be found here.)

A different mozilla-central location can be used by editing the $HOME/callgraph/callgraph.sh script. The default mozconfig options are --disable-optimize --disable-debug --disable-tests.

For information on what is stored in the database, see the Schema Reference.