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# 12. Call Graph

Now go back to the file `sdc.adb`, move the mouse over the procedure sdc at line 8, select the contextual menu Browsers->Sdc calls: this will open a new window titled Call graph browser.

Note that there is also a top level contextual menu (Sdc calls) which provides a tree view of the callers/callees.

In the call graph, click on the right arrow of Process (one of the first items on the top). Also click on the right arrow of Error_Msg.

Select Orthogonal links in the contextual menu of the graph to change the way links are displayed in the graph. You may then play with the zoom (`=` and `-` keys).

If you select Hide links from Error_Msg contextual menu, this will hide all the links that are related to this item: the link between the callers and callees of Error_Msg are no longer displayed. This can be useful when the graph becomes complex, to hide some parts. If you go back to the contextual menu, you can now select Show links to show the links again.

Click on right arrow of Process ((Decl) instructions.ads:12).

The items can also be moved: move e.g Msg item around.

You can also recompute the layout of all the current items by using the browser’s contextual menu Refresh layout (move the mouse on the browser’s background, with no box underneath, and right click).

Click on left arrow of Msg to display who is calling Msg. Notice that View calls Msg.

Click on left arrow of View: the arrow disappears, and no new items are created, which means that View isn’t called by anyone, so we’re now going to remove this procedure.

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