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.
157 lines
8.7 KiB
HTML
157 lines
8.7 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>Set Tracepoints (Debugging with GDB)</title>
|
|
|
|
<meta name="description" content="Set Tracepoints (Debugging with GDB)">
|
|
<meta name="keywords" content="Set Tracepoints (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="Tracepoints.html#Tracepoints" rel="up" title="Tracepoints">
|
|
<link href="Create-and-Delete-Tracepoints.html#Create-and-Delete-Tracepoints" rel="next" title="Create and Delete Tracepoints">
|
|
<link href="Tracepoints.html#Tracepoints" rel="prev" title="Tracepoints">
|
|
<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="Set-Tracepoints"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Analyze-Collected-Data.html#Analyze-Collected-Data" accesskey="n" rel="next">Analyze Collected Data</a>, Up: <a href="Tracepoints.html#Tracepoints" accesskey="u" rel="up">Tracepoints</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="Commands-to-Set-Tracepoints"></a>
|
|
<h3 class="section">13.1 Commands to Set Tracepoints</h3>
|
|
|
|
<p>Before running such a <em>trace experiment</em>, an arbitrary number of
|
|
tracepoints can be set. A tracepoint is actually a special type of
|
|
breakpoint (see <a href="Set-Breaks.html#Set-Breaks">Set Breaks</a>), so you can manipulate it using
|
|
standard breakpoint commands. For instance, as with breakpoints,
|
|
tracepoint numbers are successive integers starting from one, and many
|
|
of the commands associated with tracepoints take the tracepoint number
|
|
as their argument, to identify which tracepoint to work on.
|
|
</p>
|
|
<p>For each tracepoint, you can specify, in advance, some arbitrary set
|
|
of data that you want the target to collect in the trace buffer when
|
|
it hits that tracepoint. The collected data can include registers,
|
|
local variables, or global data. Later, you can use <small>GDB</small>
|
|
commands to examine the values these data had at the time the
|
|
tracepoint was hit.
|
|
</p>
|
|
<p>Tracepoints do not support every breakpoint feature. Ignore counts on
|
|
tracepoints have no effect, and tracepoints cannot run <small>GDB</small>
|
|
commands when they are hit. Tracepoints may not be thread-specific
|
|
either.
|
|
</p>
|
|
<a name="index-fast-tracepoints"></a>
|
|
<p>Some targets may support <em>fast tracepoints</em>, which are inserted in
|
|
a different way (such as with a jump instead of a trap), that is
|
|
faster but possibly restricted in where they may be installed.
|
|
</p>
|
|
<a name="index-static-tracepoints"></a>
|
|
<a name="index-markers_002c-static-tracepoints"></a>
|
|
<a name="index-probing-markers_002c-static-tracepoints"></a>
|
|
<p>Regular and fast tracepoints are dynamic tracing facilities, meaning
|
|
that they can be used to insert tracepoints at (almost) any location
|
|
in the target. Some targets may also support controlling <em>static
|
|
tracepoints</em> from <small>GDB</small>. With static tracing, a set of
|
|
instrumentation points, also known as <em>markers</em>, are embedded in
|
|
the target program, and can be activated or deactivated by name or
|
|
address. These are usually placed at locations which facilitate
|
|
investigating what the target is actually doing. <small>GDB</small>’s
|
|
support for static tracing includes being able to list instrumentation
|
|
points, and attach them with <small>GDB</small> defined high level
|
|
tracepoints that expose the whole range of convenience of
|
|
<small>GDB</small>’s tracepoints support. Namely, support for collecting
|
|
registers values and values of global or local (to the instrumentation
|
|
point) variables; tracepoint conditions and trace state variables.
|
|
The act of installing a <small>GDB</small> static tracepoint on an
|
|
instrumentation point, or marker, is referred to as <em>probing</em> a
|
|
static tracepoint marker.
|
|
</p>
|
|
<p><code>gdbserver</code> supports tracepoints on some target systems.
|
|
See <a href="Server.html#Server">Tracepoints support in <code>gdbserver</code></a>.
|
|
</p>
|
|
<p>This section describes commands to set tracepoints and associated
|
|
conditions and actions.
|
|
</p>
|
|
<table class="menu" border="0" cellspacing="0">
|
|
<tr><td align="left" valign="top">• <a href="Create-and-Delete-Tracepoints.html#Create-and-Delete-Tracepoints" accesskey="1">Create and Delete Tracepoints</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Enable-and-Disable-Tracepoints.html#Enable-and-Disable-Tracepoints" accesskey="2">Enable and Disable Tracepoints</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Tracepoint-Passcounts.html#Tracepoint-Passcounts" accesskey="3">Tracepoint Passcounts</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Tracepoint-Conditions.html#Tracepoint-Conditions" accesskey="4">Tracepoint Conditions</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Trace-State-Variables.html#Trace-State-Variables" accesskey="5">Trace State Variables</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Tracepoint-Actions.html#Tracepoint-Actions" accesskey="6">Tracepoint Actions</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Listing-Tracepoints.html#Listing-Tracepoints" accesskey="7">Listing Tracepoints</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Listing-Static-Tracepoint-Markers.html#Listing-Static-Tracepoint-Markers" accesskey="8">Listing Static Tracepoint Markers</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Starting-and-Stopping-Trace-Experiments.html#Starting-and-Stopping-Trace-Experiments" accesskey="9">Starting and Stopping Trace Experiments</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Tracepoint-Restrictions.html#Tracepoint-Restrictions">Tracepoint Restrictions</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
</table>
|
|
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Analyze-Collected-Data.html#Analyze-Collected-Data" accesskey="n" rel="next">Analyze Collected Data</a>, Up: <a href="Tracepoints.html#Tracepoints" accesskey="u" rel="up">Tracepoints</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>
|