visus
/
toolchain-gcc-arm-embedded


			
							<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 1988-2020 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 6.5, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Custom Debug Info (Debugging with GDB)</title>

<meta name="description" content="Custom Debug Info (Debugging with GDB)">
<meta name="keywords" content="Custom Debug Info (Debugging with GDB)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<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="JIT-Interface.html#JIT-Interface" rel="up" title="JIT Interface">
<link href="Using-JIT-Debug-Info-Readers.html#Using-JIT-Debug-Info-Readers" rel="next" title="Using JIT Debug Info Readers">
<link href="Unregistering-Code.html#Unregistering-Code" rel="prev" title="Unregistering Code">
<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="Custom-Debug-Info"></a>
<div class="header">
<p>
Previous: <a href="Unregistering-Code.html#Unregistering-Code" accesskey="p" rel="prev">Unregistering Code</a>, Up: <a href="JIT-Interface.html#JIT-Interface" accesskey="u" rel="up">JIT Interface</a> &nbsp; [<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="Custom-Debug-Info-1"></a>
<h3 class="section">29.4 Custom Debug Info</h3>
<a name="index-custom-JIT-debug-info"></a>
<a name="index-JIT-debug-info-reader"></a>

<p>Generating debug information in platform-native file formats (like ELF
or COFF) may be an overkill for JIT compilers; especially if all the
debug info is used for is displaying a meaningful backtrace.  The
issue can be resolved by having the JIT writers decide on a debug info
format and also provide a reader that parses the debug info generated
by the JIT compiler.  This section gives a brief overview on writing
such a parser.  More specific details can be found in the source file
<samp>gdb/jit-reader.in</samp>, which is also installed as a header at
<samp><var>includedir</var>/gdb/jit-reader.h</samp> for easy inclusion.
</p>
<p>The reader is implemented as a shared object (so this functionality is
not available on platforms which don&rsquo;t allow loading shared objects at
runtime).  Two <small>GDB</small> commands, <code>jit-reader-load</code> and
<code>jit-reader-unload</code> are provided, to be used to load and unload
the readers from a preconfigured directory.  Once loaded, the shared
object is used the parse the debug information emitted by the JIT
compiler.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Using-JIT-Debug-Info-Readers.html#Using-JIT-Debug-Info-Readers" accesskey="1">Using JIT Debug Info Readers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">How to use supplied readers correctly
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Writing-JIT-Debug-Info-Readers.html#Writing-JIT-Debug-Info-Readers" accesskey="2">Writing JIT Debug Info Readers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Creating a debug-info reader
</td></tr>
</table>


</body>
</html>