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<title>Call Graph - Using the GNAT Programming Studio</title>
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<h3 class="section">10.2 Call Graph</h3>

<p><a name="index-call-graph-438"></a><!--  -->

<p class="noindent">The call graph shows graphically the relationship between subprogram
callers and callees. A link between two items indicate that one of
them is calling the other.

   <p><a name="index-renaming-entities-439"></a>A special handling is provided for renaming entities (in Ada): if a
subprogram is a renaming of another one, both items will be displayed
in the browser, with a special hashed link between the two. Since the
renaming subprogram doesn't have a proper body, you will then need to
ask for the subprograms called by the renamed to get the list.

   <p><a name="index-screen-shot-440"></a><img src="call-graph.jpg" alt="call-graph.jpg">

   <p>In this browser, clicking on the right arrow in the title bar will
display all the entities that are called by the selected item.

   <p>Clicking on the left arrow will display all the entities that call the
selected item (i.e. its callers).

   <p>This browser is accessible through the contextual menu in the project
view and source editor, by selecting one of the items:

   <p>All boxes in this browser list several information: the location of their
declaration, and the list of all their references in the other entities
currently displayed in the browser. If you close the box for an entity that
calls them, the matching references are also hidden, to keep the contents
of the browser simpler.

     <dl>
<dt><samp><span class="command">Browsers-&gt;</span><i>Entity</i><span class="command"> calls</span></samp><dd>Display all the entities called by the selected entity. This has the
same effect as clicking on the right title bar arrow if the item is
already present in the call graph.

     <br><dt><samp><span class="command">Browsers-&gt;</span><i>Entity</i><span class="command"> is called by</span></samp><dd>Display all the entities called by the selected entity. This has the
same effect as clicking on the left title bar arrow if the item is
already present in the call graph. 
</dl>

   <p>The contextual menu available by right-clicking on the entities in the
browser has the following new entries, in addition to the ones added by
other modules of GPS.

     <dl>
<dt><samp><i>Entity</i><span class="command"> calls</span></samp><dd>Same as described above.

     <br><dt><samp><i>Entity</i><span class="command"> is called by</span></samp><dd>Same as described above.

     <br><dt><samp><span class="command">Go To Spec</span></samp><dd>Selecting this item will open a source editor that displays the
declaration of the entity.

     <br><dt><samp><span class="command">Go To Body</span></samp><dd>Selecting this item will open a source editor that displays the
body of the entity.

     <br><dt><samp><span class="command">Locate in Project View</span></samp><dd>Selecting this menu entry will move the focus to the project view,
and select the first node representing the file in which the entity is
declared. This makes it easier to see which other entities are
declared in the same file. 
</dl>

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