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212 lines
8.5 KiB
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212 lines
8.5 KiB
HTML
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<head>
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<title>Frame Annotations (GDB’s Obsolete Annotations)</title>
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<meta name="description" content="Frame Annotations (GDB’s Obsolete Annotations)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="Displays.html#Displays" rel="next" title="Displays">
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<link href="Value-Annotations.html#Value-Annotations" rel="prev" title="Value Annotations">
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</head>
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<body lang="en">
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<a name="Frame-Annotations"></a>
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<div class="header">
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<p>
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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> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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<hr>
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<a name="Frames"></a>
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<h2 class="chapter">6 Frames</h2>
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<p><em>Value Annotations have been removed. <small>GDB/MI</small> instead provides
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a number of frame commands.</em>
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</p>
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<p><em>Frame annotations are no longer available. The <small>GDB/MI</small>
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provides ‘<samp>-stack-list-arguments</samp>’, ‘<samp>-stack-list-locals</samp>’, and
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‘<samp>-stack-list-frames</samp>’ commands.</em>
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</p>
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<a name="index-annotations-for-frames"></a>
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<p>Whenever <small>GDB</small> prints a frame, it annotates it. For example, this applies
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to frames printed when <small>GDB</small> stops, output from commands such as
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<code>backtrace</code> or <code>up</code>, etc.
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</p>
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<a name="index-frame_002dbegin"></a>
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<p>The frame annotation begins with
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</p>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zframe-begin <var>level</var> <var>address</var>
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<var>level-string</var>
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</pre></div>
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<p>where <var>level</var> is the number of the frame (0 is the innermost frame,
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and other frames have positive numbers), <var>address</var> is the address of
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the code executing in that frame, and <var>level-string</var> is a string
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designed to convey the level to the user. <var>address</var> is in the form
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‘<samp>0x</samp>’ followed by one or more lowercase hex digits (note that this
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does not depend on the language). The frame ends with
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</p>
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<a name="index-frame_002dend"></a>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zframe-end
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</pre></div>
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<p>Between these annotations is the main body of the frame, which can
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consist of
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</p>
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<ul>
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<li> <a name="index-function_002dcall"></a>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zfunction-call
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<var>function-call-string</var>
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</pre></div>
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where <var>function-call-string</var> is text designed to convey to the user
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that this frame is associated with a function call made by <small>GDB</small> to a
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function in the program being debugged.
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</li><li> <a name="index-signal_002dhandler_002dcaller"></a>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zsignal-handler-caller
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<var>signal-handler-caller-string</var>
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</pre></div>
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where <var>signal-handler-caller-string</var> is text designed to convey to
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the user that this frame is associated with whatever mechanism is used
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by this operating system to call a signal handler (it is the frame which
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calls the signal handler, not the frame for the signal handler itself).
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</li><li> A normal frame.
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<a name="index-frame_002daddress"></a>
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<a name="index-frame_002daddress_002dend"></a>
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<p>This can optionally (depending on whether this is thought of as
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interesting information for the user to see) begin with
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</p>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zframe-address
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<var>address</var>
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^Z^Zframe-address-end
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<var>separator-string</var>
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</pre></div>
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<p>where <var>address</var> is the address executing in the frame (the same
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address as in the <code>frame-begin</code> annotation, but printed in a form
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which is intended for user consumption—in particular, the syntax varies
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depending on the language), and <var>separator-string</var> is a string
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intended to separate this address from what follows for the user’s
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benefit.
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</p>
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<a name="index-frame_002dfunction_002dname"></a>
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<a name="index-frame_002dargs"></a>
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<p>Then comes
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</p>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zframe-function-name
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<var>function-name</var>
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^Z^Zframe-args
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<var>arguments</var>
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</pre></div>
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<p>where <var>function-name</var> is the name of the function executing in the
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frame, or ‘<samp>??</samp>’ if not known, and <var>arguments</var> are the arguments
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to the frame, with parentheses around them (each argument is annotated
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individually as well, see <a href="Value-Annotations.html#Value-Annotations">Value Annotations</a>).
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</p>
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<a name="index-frame_002dsource_002dbegin"></a>
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<a name="index-frame_002dsource_002dfile"></a>
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<a name="index-frame_002dsource_002dfile_002dend"></a>
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<a name="index-frame_002dsource_002dline"></a>
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<a name="index-frame_002dsource_002dend"></a>
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<p>If source information is available, a reference to it is then printed:
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</p>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zframe-source-begin
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<var>source-intro-string</var>
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^Z^Zframe-source-file
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<var>filename</var>
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^Z^Zframe-source-file-end
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:
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^Z^Zframe-source-line
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<var>line-number</var>
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^Z^Zframe-source-end
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</pre></div>
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<p>where <var>source-intro-string</var> separates for the user’s benefit the
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reference from the text which precedes it, <var>filename</var> is the name of
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the source file, and <var>line-number</var> is the line number within that
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file (the first line is line 1).
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</p>
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<a name="index-frame_002dwhere"></a>
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<p>If <small>GDB</small> prints some information about where the frame is from (which
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library, which load segment, etc.; currently only done on the RS/6000),
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it is annotated with
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</p>
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<div class="smallexample">
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<pre class="smallexample">^Z^Zframe-where
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<var>information</var>
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</pre></div>
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<p>Then, if source is to actually be displayed for this frame (for example,
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this is not true for output from the <code>backtrace</code> command), then a
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<code>source</code> annotation (see <a href="Source-Annotations.html#Source-Annotations">Source Annotations</a>) is displayed. Unlike
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most annotations, this is output instead of the normal text which would be
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output, not in addition.
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</p></li></ul>
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<hr>
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<div class="header">
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<p>
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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> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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</body>
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</html>
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