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toolchain-gcc-arm-embedded

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<title>Frame Annotations (GDB&rsquo;s Obsolete Annotations)</title>

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<a name="Frame-Annotations"></a>
<div class="header">
<p>
Next: <a href="Displays.html#Displays" accesskey="n" rel="next">Displays</a>, Previous: <a href="Value-Annotations.html#Value-Annotations" accesskey="p" rel="prev">Value Annotations</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
</div>
<hr>
<a name="Frames"></a>
<h2 class="chapter">6 Frames</h2>

<p><em>Value Annotations have been removed.  <small>GDB/MI</small> instead provides
a number of frame commands.</em>
</p>
<p><em>Frame annotations are no longer available.  The <small>GDB/MI</small>
provides &lsquo;<samp>-stack-list-arguments</samp>&rsquo;, &lsquo;<samp>-stack-list-locals</samp>&rsquo;, and
&lsquo;<samp>-stack-list-frames</samp>&rsquo; commands.</em>
</p>
<a name="index-annotations-for-frames"></a>
<p>Whenever <small>GDB</small> prints a frame, it annotates it.  For example, this applies
to frames printed when <small>GDB</small> stops, output from commands such as
<code>backtrace</code> or <code>up</code>, etc.
</p>
<a name="index-frame_002dbegin"></a>
<p>The frame annotation begins with
</p>
<div class="smallexample">
<pre class="smallexample">^Z^Zframe-begin <var>level</var> <var>address</var>
<var>level-string</var>
</pre></div>

<p>where <var>level</var> is the number of the frame (0 is the innermost frame,
and other frames have positive numbers), <var>address</var> is the address of
the code executing in that frame, and <var>level-string</var> is a string
designed to convey the level to the user.  <var>address</var> is in the form
&lsquo;<samp>0x</samp>&rsquo; followed by one or more lowercase hex digits (note that this
does not depend on the language).  The frame ends with
</p>
<a name="index-frame_002dend"></a>
<div class="smallexample">
<pre class="smallexample">^Z^Zframe-end
</pre></div>

<p>Between these annotations is the main body of the frame, which can
consist of
</p>
<ul>
<li> <a name="index-function_002dcall"></a>
<div class="smallexample">
<pre class="smallexample">^Z^Zfunction-call
<var>function-call-string</var>
</pre></div>

where <var>function-call-string</var> is text designed to convey to the user
that this frame is associated with a function call made by <small>GDB</small> to a
function in the program being debugged.

</li><li> <a name="index-signal_002dhandler_002dcaller"></a>
<div class="smallexample">
<pre class="smallexample">^Z^Zsignal-handler-caller
<var>signal-handler-caller-string</var>
</pre></div>

where <var>signal-handler-caller-string</var> is text designed to convey to
the user that this frame is associated with whatever mechanism is used
by this operating system to call a signal handler (it is the frame which
calls the signal handler, not the frame for the signal handler itself).

</li><li> A normal frame.

<a name="index-frame_002daddress"></a>
<a name="index-frame_002daddress_002dend"></a>
<p>This can optionally (depending on whether this is thought of as
interesting information for the user to see) begin with
</p>
<div class="smallexample">
<pre class="smallexample">^Z^Zframe-address
<var>address</var>
^Z^Zframe-address-end
<var>separator-string</var>
</pre></div>

<p>where <var>address</var> is the address executing in the frame (the same
address as in the <code>frame-begin</code> annotation, but printed in a form
which is intended for user consumption&mdash;in particular, the syntax varies
depending on the language), and <var>separator-string</var> is a string
intended to separate this address from what follows for the user&rsquo;s
benefit.
</p>
<a name="index-frame_002dfunction_002dname"></a>
<a name="index-frame_002dargs"></a>
<p>Then comes
</p>
<div class="smallexample">
<pre class="smallexample">^Z^Zframe-function-name
<var>function-name</var>
^Z^Zframe-args
<var>arguments</var>
</pre></div>

<p>where <var>function-name</var> is the name of the function executing in the
frame, or &lsquo;<samp>??</samp>&rsquo; if not known, and <var>arguments</var> are the arguments
to the frame, with parentheses around them (each argument is annotated
individually as well, see <a href="Value-Annotations.html#Value-Annotations">Value Annotations</a>).
</p>
<a name="index-frame_002dsource_002dbegin"></a>
<a name="index-frame_002dsource_002dfile"></a>
<a name="index-frame_002dsource_002dfile_002dend"></a>
<a name="index-frame_002dsource_002dline"></a>
<a name="index-frame_002dsource_002dend"></a>
<p>If source information is available, a reference to it is then printed:
</p>
<div class="smallexample">
<pre class="smallexample">^Z^Zframe-source-begin
<var>source-intro-string</var>
^Z^Zframe-source-file
<var>filename</var>
^Z^Zframe-source-file-end
:
^Z^Zframe-source-line
<var>line-number</var>
^Z^Zframe-source-end
</pre></div>

<p>where <var>source-intro-string</var> separates for the user&rsquo;s benefit the
reference from the text which precedes it, <var>filename</var> is the name of
the source file, and <var>line-number</var> is the line number within that
file (the first line is line 1).
</p>
<a name="index-frame_002dwhere"></a>
<p>If <small>GDB</small> prints some information about where the frame is from (which
library, which load segment, etc.; currently only done on the RS/6000),
it is annotated with
</p>
<div class="smallexample">
<pre class="smallexample">^Z^Zframe-where
<var>information</var>
</pre></div>

<p>Then, if source is to actually be displayed for this frame (for example,
this is not true for output from the <code>backtrace</code> command), then a
<code>source</code> annotation (see <a href="Source-Annotations.html#Source-Annotations">Source Annotations</a>) is displayed.  Unlike
most annotations, this is output instead of the normal text which would be
output, not in addition.
</p></li></ul>

<hr>
<div class="header">
<p>
Next: <a href="Displays.html#Displays" accesskey="n" rel="next">Displays</a>, Previous: <a href="Value-Annotations.html#Value-Annotations" accesskey="p" rel="prev">Value Annotations</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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