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<title>The Callgraph View - Using the GNAT Programming Studio</title>
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Next:&nbsp;<a rel="next" accesskey="n" href="Bookmarks.html#Bookmarks">Bookmarks</a>,
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<h3 class="section">2.12 The Callgraph View</h3>

<p><a name="index-callgraph-59"></a><!--  -->

<p class="noindent">The callgraph view plays a role similar the callgraph browser. They display
the same information about entities, but in two different ways: the callgraph
view displays the information in a tree, easily navigable and perhaps easier
to manipulate when lots of entities are involved; the callgraph browser
displays the information as graphical boxes that can be manipulated on the
screen, and is best suited to generate a diagram that can be later exported
to your own documents.

   <p>This callgraph view is used to display the information about what subprograms
are called by a given entity, and, opposite, what entities are calling a
given entity.

   <p>Some references might be reported with an additional " (dispatching)" text. 
In such a case, this indicates that the call to the entity is not explicit
in the sources, but could occur through dynamic dispatching. This of course
depends on what arguments are passed to the caller at run time, and it is
possible that the subprogram is in fact never dispatched to.

   <p>This view is automatically displayed when you select one of the contextual
menus <code>... calls</code> and <code>... is called by</code>. Every time you
select one of these menus, a new view is opened to display that entity.

   <p>Whenever you expand a node from the tree by clicking on the small expander
arrow on the left of the line, further callgraph information is computed for
the selected entity, which makes it very easy to get information for a full
callgraph tree.

   <p>Closing and expanding a node again will recompute the callgraph for the
entity.

   <p>On the right side of the main tree, a list displays the locations of calls for
the selected entity. Clicking on entries in this list opens editors showing
the corresponding location.

   <p>The Callgraph View supports keyboard navigation: <code>Up</code> and <code>Down</code>
keys navigate between listed locations, <code>Left</code> collapses the current
level, <code>Right</code> expands the current level, and <code>Return</code> jumps to the
currently selected location.

   <p>The callgraph view is automatically saved in the desktop, and restored
the next time you restart GPS. However, the information displayed in these
might no longer be accurate at this stage, since it shows the status of the
callgraph during the last GPS session.

   <p>Left-clicking on a line in the Call Tree brings up a contextual
menu with the following entries:

     <dl>
<dt><b>Collapse all</b><dd>Collapse all the entities in the Callgraph View.

     <br><dt><b>Remove entity</b><dd>Remove the selected entity from the Callgraph View.

     <br><dt><b>Clear Call Trees</b><dd>Remove all entries from the Callgraph View.

   </dl>

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