<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
<html>
|
<!-- Copyright (C) 1988-2021 Free Software Foundation, Inc.
|
|
Permission is granted to copy, distribute and/or modify this document
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
any later version published by the Free Software Foundation; with the
|
Invariant Sections being "Free Software" and "Free Software Needs
|
Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
|
and with the Back-Cover Texts as in (a) below.
|
|
(a) The FSF's Back-Cover Text is: "You are free to copy and modify
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
developing GNU and promoting software freedom." -->
|
<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
|
<head>
|
<title>Debugging with GDB: Frame Apply</title>
|
|
<meta name="description" content="Debugging with GDB: Frame Apply">
|
<meta name="keywords" content="Debugging with GDB: Frame Apply">
|
<meta name="resource-type" content="document">
|
<meta name="distribution" content="global">
|
<meta name="Generator" content="makeinfo">
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
<link href="index.html#Top" rel="start" title="Top">
|
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
<link href="Stack.html#Stack" rel="up" title="Stack">
|
<link href="Frame-Filter-Management.html#Frame-Filter-Management" rel="next" title="Frame Filter Management">
|
<link href="Frame-Info.html#Frame-Info" rel="previous" title="Frame Info">
|
<style type="text/css">
|
<!--
|
a.summary-letter {text-decoration: none}
|
blockquote.smallquotation {font-size: smaller}
|
div.display {margin-left: 3.2em}
|
div.example {margin-left: 3.2em}
|
div.indentedblock {margin-left: 3.2em}
|
div.lisp {margin-left: 3.2em}
|
div.smalldisplay {margin-left: 3.2em}
|
div.smallexample {margin-left: 3.2em}
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
div.smalllisp {margin-left: 3.2em}
|
kbd {font-style:oblique}
|
pre.display {font-family: inherit}
|
pre.format {font-family: inherit}
|
pre.menu-comment {font-family: serif}
|
pre.menu-preformatted {font-family: serif}
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
pre.smallexample {font-size: smaller}
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
pre.smalllisp {font-size: smaller}
|
span.nocodebreak {white-space:nowrap}
|
span.nolinebreak {white-space:nowrap}
|
span.roman {font-family:serif; font-weight:normal}
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
ul.no-bullet {list-style: none}
|
-->
|
</style>
|
|
|
</head>
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
<a name="Frame-Apply"></a>
|
<div class="header">
|
<p>
|
Next: <a href="Frame-Filter-Management.html#Frame-Filter-Management" accesskey="n" rel="next">Frame Filter Management</a>, Previous: <a href="Frame-Info.html#Frame-Info" accesskey="p" rel="previous">Frame Info</a>, Up: <a href="Stack.html#Stack" accesskey="u" rel="up">Stack</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
</div>
|
<hr>
|
<a name="Applying-a-Command-to-Several-Frames"></a>
|
<h3 class="section">8.5 Applying a Command to Several Frames</h3>
|
<a name="index-frame-apply"></a>
|
<a name="index-apply-command-to-several-frames"></a>
|
<dl compact="compact">
|
<dt><code>frame apply [all | <var>count</var> | <var>-count</var> | level <var>level</var>…] [<var>option</var>]… <var>command</var></code></dt>
|
<dd><p>The <code>frame apply</code> command allows you to apply the named
|
<var>command</var> to one or more frames.
|
</p>
|
<dl compact="compact">
|
<dt><code><code>all</code></code></dt>
|
<dd><p>Specify <code>all</code> to apply <var>command</var> to all frames.
|
</p>
|
</dd>
|
<dt><code><var>count</var></code></dt>
|
<dd><p>Use <var>count</var> to apply <var>command</var> to the innermost <var>count</var>
|
frames, where <var>count</var> is a positive number.
|
</p>
|
</dd>
|
<dt><code><var>-count</var></code></dt>
|
<dd><p>Use <var>-count</var> to apply <var>command</var> to the outermost <var>count</var>
|
frames, where <var>count</var> is a positive number.
|
</p>
|
</dd>
|
<dt><code><code>level</code></code></dt>
|
<dd><p>Use <code>level</code> to apply <var>command</var> to the set of frames identified
|
by the <var>level</var> list. <var>level</var> is a frame level or a range of frame
|
levels as <var>level1</var>-<var>level2</var>. The frame level is the number shown
|
in the first field of the ‘<samp>backtrace</samp>’ command output.
|
E.g., ‘<samp>2-4 6-8 3</samp>’ indicates to apply <var>command</var> for the frames
|
at levels 2, 3, 4, 6, 7, 8, and then again on frame at level 3.
|
</p>
|
</dd>
|
</dl>
|
|
<p>Note that the frames on which <code>frame apply</code> applies a command are
|
also influenced by the <code>set backtrace</code> settings such as <code>set
|
backtrace past-main</code> and <code>set backtrace limit N</code>.
|
See <a href="Backtrace.html#Backtrace">Backtraces</a>.
|
</p>
|
<p>The <code>frame apply</code> command also supports a number of options that
|
allow overriding relevant <code>set backtrace</code> settings:
|
</p>
|
<dl compact="compact">
|
<dt><code>-past-main [<code>on</code>|<code>off</code>]</code></dt>
|
<dd><p>Whether backtraces should continue past <code>main</code>.
|
Related setting: <a href="Backtrace.html#set-backtrace-past_002dmain">set backtrace past-main</a>.
|
</p>
|
</dd>
|
<dt><code>-past-entry [<code>on</code>|<code>off</code>]</code></dt>
|
<dd><p>Whether backtraces should continue past the entry point of a program.
|
Related setting: <a href="Backtrace.html#set-backtrace-past_002dentry">set backtrace past-entry</a>.
|
</p></dd>
|
</dl>
|
|
<p>By default, <small>GDB</small> displays some frame information before the
|
output produced by <var>command</var>, and an error raised during the
|
execution of a <var>command</var> will abort <code>frame apply</code>. The
|
following options can be used to fine-tune these behaviors:
|
</p>
|
<dl compact="compact">
|
<dt><code>-c</code></dt>
|
<dd><p>The flag <code>-c</code>, which stands for ‘<samp>continue</samp>’, causes any
|
errors in <var>command</var> to be displayed, and the execution of
|
<code>frame apply</code> then continues.
|
</p></dd>
|
<dt><code>-s</code></dt>
|
<dd><p>The flag <code>-s</code>, which stands for ‘<samp>silent</samp>’, causes any errors
|
or empty output produced by a <var>command</var> to be silently ignored.
|
That is, the execution continues, but the frame information and errors
|
are not printed.
|
</p></dd>
|
<dt><code>-q</code></dt>
|
<dd><p>The flag <code>-q</code> (‘<samp>quiet</samp>’) disables printing the frame
|
information.
|
</p></dd>
|
</dl>
|
|
<p>The following example shows how the flags <code>-c</code> and <code>-s</code> are
|
working when applying the command <code>p j</code> to all frames, where
|
variable <code>j</code> can only be successfully printed in the outermost
|
<code>#1 main</code> frame.
|
</p>
|
<div class="smallexample">
|
<pre class="smallexample">(gdb) frame apply all p j
|
#0 some_function (i=5) at fun.c:4
|
No symbol "j" in current context.
|
(gdb) frame apply all -c p j
|
#0 some_function (i=5) at fun.c:4
|
No symbol "j" in current context.
|
#1 0x565555fb in main (argc=1, argv=0xffffd2c4) at fun.c:11
|
$1 = 5
|
(gdb) frame apply all -s p j
|
#1 0x565555fb in main (argc=1, argv=0xffffd2c4) at fun.c:11
|
$2 = 5
|
(gdb)
|
</pre></div>
|
|
<p>By default, ‘<samp>frame apply</samp>’, prints the frame location
|
information before the command output:
|
</p>
|
<div class="smallexample">
|
<pre class="smallexample">(gdb) frame apply all p $sp
|
#0 some_function (i=5) at fun.c:4
|
$4 = (void *) 0xffffd1e0
|
#1 0x565555fb in main (argc=1, argv=0xffffd2c4) at fun.c:11
|
$5 = (void *) 0xffffd1f0
|
(gdb)
|
</pre></div>
|
|
<p>If the flag <code>-q</code> is given, no frame information is printed:
|
</p><div class="smallexample">
|
<pre class="smallexample">(gdb) frame apply all -q p $sp
|
$12 = (void *) 0xffffd1e0
|
$13 = (void *) 0xffffd1f0
|
(gdb)
|
</pre></div>
|
|
</dd>
|
</dl>
|
|
<dl compact="compact">
|
<dd>
|
<a name="index-faas"></a>
|
<a name="index-apply-a-command-to-all-frames-_0028ignoring-errors-and-empty-output_0029"></a>
|
</dd>
|
<dt><code>faas <var>command</var></code></dt>
|
<dd><p>Shortcut for <code>frame apply all -s <var>command</var></code>.
|
Applies <var>command</var> on all frames, ignoring errors and empty output.
|
</p>
|
<p>It can for example be used to print a local variable or a function
|
argument without knowing the frame where this variable or argument
|
is, using:
|
</p><div class="smallexample">
|
<pre class="smallexample">(gdb) faas p some_local_var_i_do_not_remember_where_it_is
|
</pre></div>
|
|
<p>The <code>faas</code> command accepts the same options as the <code>frame
|
apply</code> command. See <a href="#Frame-Apply">frame apply</a>.
|
</p>
|
<p>Note that the command <code>tfaas <var>command</var></code> applies <var>command</var>
|
on all frames of all threads. See See <a href="Threads.html#Threads">Threads</a>.
|
</p></dd>
|
</dl>
|
|
|
<hr>
|
<div class="header">
|
<p>
|
Next: <a href="Frame-Filter-Management.html#Frame-Filter-Management" accesskey="n" rel="next">Frame Filter Management</a>, Previous: <a href="Frame-Info.html#Frame-Info" accesskey="p" rel="previous">Frame Info</a>, Up: <a href="Stack.html#Stack" accesskey="u" rel="up">Stack</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
</div>
|
|
|
|
</body>
|
</html>
|
