You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
201 lines
8.9 KiB
HTML
201 lines
8.9 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2019 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 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Frame Info (Debugging with GDB)</title>
|
|
|
|
<meta name="description" content="Frame Info (Debugging with GDB)">
|
|
<meta name="keywords" content="Frame Info (Debugging with GDB)">
|
|
<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-Apply.html#Frame-Apply" rel="next" title="Frame Apply">
|
|
<link href="Selection.html#Selection" rel="prev" title="Selection">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
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.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Frame-Info"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Frame-Apply.html#Frame-Apply" accesskey="n" rel="next">Frame Apply</a>, Previous: <a href="Selection.html#Selection" accesskey="p" rel="prev">Selection</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="Information-About-a-Frame"></a>
|
|
<h3 class="section">8.4 Information About a Frame</h3>
|
|
|
|
<p>There are several other commands to print information about the selected
|
|
stack frame.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>frame</code></dt>
|
|
<dt><code>f</code></dt>
|
|
<dd><p>When used without any argument, this command does not change which
|
|
frame is selected, but prints a brief description of the currently
|
|
selected stack frame. It can be abbreviated <code>f</code>. With an
|
|
argument, this command is used to select a stack frame.
|
|
See <a href="Selection.html#Selection">Selecting a Frame</a>.
|
|
</p>
|
|
<a name="index-info-frame"></a>
|
|
<a name="index-info-f-_0028info-frame_0029"></a>
|
|
</dd>
|
|
<dt><code>info frame</code></dt>
|
|
<dt><code>info f</code></dt>
|
|
<dd><p>This command prints a verbose description of the selected stack frame,
|
|
including:
|
|
</p>
|
|
<ul>
|
|
<li> the address of the frame
|
|
</li><li> the address of the next frame down (called by this frame)
|
|
</li><li> the address of the next frame up (caller of this frame)
|
|
</li><li> the language in which the source code corresponding to this frame is written
|
|
</li><li> the address of the frame’s arguments
|
|
</li><li> the address of the frame’s local variables
|
|
</li><li> the program counter saved in it (the address of execution in the caller frame)
|
|
</li><li> which registers were saved in the frame
|
|
</li></ul>
|
|
|
|
<p>The verbose description is useful when
|
|
something has gone wrong that has made the stack format fail to fit
|
|
the usual conventions.
|
|
</p>
|
|
</dd>
|
|
<dt><code>info frame <span class="roman">[</span> <var>frame-selection-spec</var> <span class="roman">]</span></code></dt>
|
|
<dt><code>info f <span class="roman">[</span> <var>frame-selection-spec</var> <span class="roman">]</span></code></dt>
|
|
<dd><p>Print a verbose description of the frame selected by
|
|
<var>frame-selection-spec</var>. The <var>frame-selection-spec</var> is the
|
|
same as for the <code>frame</code> command (see <a href="Selection.html#Selection">Selecting
|
|
a Frame</a>). The selected frame remains unchanged by this command.
|
|
</p>
|
|
<a name="index-info-args"></a>
|
|
</dd>
|
|
<dt><code>info args [-q]</code></dt>
|
|
<dd><p>Print the arguments of the selected frame, each on a separate line.
|
|
</p>
|
|
<p>The optional flag ‘<samp>-q</samp>’, which stands for ‘<samp>quiet</samp>’, disables
|
|
printing header information and messages explaining why no argument
|
|
have been printed.
|
|
</p>
|
|
</dd>
|
|
<dt><code>info args [-q] [-t <var>type_regexp</var>] [<var>regexp</var>]</code></dt>
|
|
<dd><p>Like <kbd>info args</kbd>, but only print the arguments selected
|
|
with the provided regexp(s).
|
|
</p>
|
|
<p>If <var>regexp</var> is provided, print only the arguments whose names
|
|
match the regular expression <var>regexp</var>.
|
|
</p>
|
|
<p>If <var>type_regexp</var> is provided, print only the arguments whose
|
|
types, as printed by the <code>whatis</code> command, match
|
|
the regular expression <var>type_regexp</var>.
|
|
If <var>type_regexp</var> contains space(s), it should be enclosed in
|
|
quote characters. If needed, use backslash to escape the meaning
|
|
of special characters or quotes.
|
|
</p>
|
|
<p>If both <var>regexp</var> and <var>type_regexp</var> are provided, an argument
|
|
is printed only if its name matches <var>regexp</var> and its type matches
|
|
<var>type_regexp</var>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>info locals [-q]</code></dt>
|
|
<dd><a name="index-info-locals"></a>
|
|
<p>Print the local variables of the selected frame, each on a separate
|
|
line. These are all variables (declared either static or automatic)
|
|
accessible at the point of execution of the selected frame.
|
|
</p>
|
|
<p>The optional flag ‘<samp>-q</samp>’, which stands for ‘<samp>quiet</samp>’, disables
|
|
printing header information and messages explaining why no local variables
|
|
have been printed.
|
|
</p>
|
|
</dd>
|
|
<dt><code>info locals [-q] [-t <var>type_regexp</var>] [<var>regexp</var>]</code></dt>
|
|
<dd><p>Like <kbd>info locals</kbd>, but only print the local variables selected
|
|
with the provided regexp(s).
|
|
</p>
|
|
<p>If <var>regexp</var> is provided, print only the local variables whose names
|
|
match the regular expression <var>regexp</var>.
|
|
</p>
|
|
<p>If <var>type_regexp</var> is provided, print only the local variables whose
|
|
types, as printed by the <code>whatis</code> command, match
|
|
the regular expression <var>type_regexp</var>.
|
|
If <var>type_regexp</var> contains space(s), it should be enclosed in
|
|
quote characters. If needed, use backslash to escape the meaning
|
|
of special characters or quotes.
|
|
</p>
|
|
<p>If both <var>regexp</var> and <var>type_regexp</var> are provided, a local variable
|
|
is printed only if its name matches <var>regexp</var> and its type matches
|
|
<var>type_regexp</var>.
|
|
</p>
|
|
<p>The command <kbd>info locals -q -t <var>type_regexp</var></kbd> can usefully be
|
|
combined with the commands <kbd>frame apply</kbd> and <kbd>thread apply</kbd>.
|
|
For example, your program might use Resource Acquisition Is
|
|
Initialization types (RAII) such as <code>lock_something_t</code>: each
|
|
local variable of type <code>lock_something_t</code> automatically places a
|
|
lock that is destroyed when the variable goes out of scope. You can
|
|
then list all acquired locks in your program by doing
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">thread apply all -s frame apply all -s info locals -q -t lock_something_t
|
|
</pre></div>
|
|
<p>or the equivalent shorter form
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">tfaas i lo -q -t lock_something_t
|
|
</pre></div>
|
|
|
|
</dd>
|
|
</dl>
|
|
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Frame-Apply.html#Frame-Apply" accesskey="n" rel="next">Frame Apply</a>, Previous: <a href="Selection.html#Selection" accesskey="p" rel="prev">Selection</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>
|