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<title>The Assembly Window - Using the GNAT Programming Studio</title>
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Previous: <a rel="previous" accesskey="p" href="Using-the-Source-Editor-when-Debugging.html#Using-the-Source-Editor-when-Debugging">Using the Source Editor when Debugging</a>,
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<h3 class="section">11.7 The Assembly Window</h3>
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<p>It is sometimes convenient to look at the assembly code for the subprogram
or source line you are currently debugging.
<p>You can open the assembly window by using the menu
<code>Debug->Data->Assembly</code>.
<p><a name="index-screen-shot-567"></a><img src="assembly.jpg" alt="assembly.jpg">
<p>The current assembly instruction is highlighted with a green
arrow on its left. The instructions corresponding to the current source
line are highlighted in red by default. This allows you to easily see
where the program counter will point to, once you have pressed the "Next"
button on the tool bar.
<p>Moving to the next assembly instruction is done through the "Nexti"
(next instruction) button in the tool bar. If you choose "Stepi"
instead (step instruction), this will also jump to the subprogram
being called.
<p>For efficiency reasons, only a small part of the assembly code around the
current instruction is displayed.
You can specify in the <a href="preferences-dialog.html#preferences-dialog">preferences dialog</a> how many instructions
are displayed by default. Also, you can easily
display the instructions immediately preceding or following the
currently displayed instructions by pressing one of the <Page up> or
<Page down> keys, or by using the contextual menu in the assembly
window.
<p>A convenient complement when debugging at the assembly level is the
ability of displaying the contents of machine registers.
When the debugger supports it (as gdb does), you can select the
<code>Data->Display Registers</code> menu to get an item in the canvas that will
show the current contents of each machine register, and that will be updated
every time one of them changes.
<p>You might also choose to look at a single register.
With gdb, select the <code>Data->Display Any Expression</code>, entering
something like
<p><a name="index-example-568"></a>
<pre class="smallexample"> output /x $eax
</pre>
<p>in the field, and selecting the toggle button "Expression is a subprogram
call". This will create a new canvas item that will be refreshed every
time the value of the register (in this case eax) changes.
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