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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gdb/Line-Tables-In-Python.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gdb/Line-Tables-In-Python.html b/share/doc/gdb/Line-Tables-In-Python.html new file mode 100644 index 0000000..fb3f9df --- /dev/null +++ b/share/doc/gdb/Line-Tables-In-Python.html @@ -0,0 +1,162 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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: Line Tables In Python</title> + +<meta name="description" content="Debugging with GDB: Line Tables In Python"> +<meta name="keywords" content="Debugging with GDB: Line Tables In Python"> +<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="Python-API.html#Python-API" rel="up" title="Python API"> +<link href="Breakpoints-In-Python.html#Breakpoints-In-Python" rel="next" title="Breakpoints In Python"> +<link href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python" rel="previous" title="Symbol Tables In Python"> +<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="Line-Tables-In-Python"></a> +<div class="header"> +<p> +Next: <a href="Breakpoints-In-Python.html#Breakpoints-In-Python" accesskey="n" rel="next">Breakpoints In Python</a>, Previous: <a href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python" accesskey="p" rel="previous">Symbol Tables In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</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="Manipulating-line-tables-using-Python"></a> +<h4 class="subsubsection">23.3.2.30 Manipulating line tables using Python</h4> + +<a name="index-line-tables-in-python"></a> +<a name="index-gdb_002eLineTable"></a> + +<p>Python code can request and inspect line table information from a +symbol table that is loaded in <small>GDB</small>. A line table is a +mapping of source lines to their executable locations in memory. To +acquire the line table information for a particular symbol table, use +the <code>linetable</code> function (see <a href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python">Symbol Tables In Python</a>). +</p> +<p>A <code>gdb.LineTable</code> is iterable. The iterator returns +<code>LineTableEntry</code> objects that correspond to the source line and +address for each line table entry. <code>LineTableEntry</code> objects have +the following attributes: +</p> +<dl> +<dt><a name="index-LineTableEntry_002eline"></a>Variable: <strong>LineTableEntry.line</strong></dt> +<dd><p>The source line number for this line table entry. This number +corresponds to the actual line of source. This attribute is not +writable. +</p></dd></dl> + +<dl> +<dt><a name="index-LineTableEntry_002epc"></a>Variable: <strong>LineTableEntry.pc</strong></dt> +<dd><p>The address that is associated with the line table entry where the +executable code for that source line resides in memory. This +attribute is not writable. +</p></dd></dl> + +<p>As there can be multiple addresses for a single source line, you may +receive multiple <code>LineTableEntry</code> objects with matching +<code>line</code> attributes, but with different <code>pc</code> attributes. The +iterator is sorted in ascending <code>pc</code> order. Here is a small +example illustrating iterating over a line table. +</p> +<div class="smallexample"> +<pre class="smallexample">symtab = gdb.selected_frame().find_sal().symtab +linetable = symtab.linetable() +for line in linetable: + print ("Line: "+str(line.line)+" Address: "+hex(line.pc)) +</pre></div> + +<p>This will have the following output: +</p> +<div class="smallexample"> +<pre class="smallexample">Line: 33 Address: 0x4005c8L +Line: 37 Address: 0x4005caL +Line: 39 Address: 0x4005d2L +Line: 40 Address: 0x4005f8L +Line: 42 Address: 0x4005ffL +Line: 44 Address: 0x400608L +Line: 42 Address: 0x40060cL +Line: 45 Address: 0x400615L +</pre></div> + +<p>In addition to being able to iterate over a <code>LineTable</code>, it also +has the following direct access methods: +</p> +<dl> +<dt><a name="index-LineTable_002eline"></a>Function: <strong>LineTable.line</strong> <em>(line)</em></dt> +<dd><p>Return a Python <code>Tuple</code> of <code>LineTableEntry</code> objects for any +entries in the line table for the given <var>line</var>, which specifies +the source code line. If there are no entries for that source code +<var>line</var>, the Python <code>None</code> is returned. +</p></dd></dl> + +<dl> +<dt><a name="index-LineTable_002ehas_005fline"></a>Function: <strong>LineTable.has_line</strong> <em>(line)</em></dt> +<dd><p>Return a Python <code>Boolean</code> indicating whether there is an entry in +the line table for this source line. Return <code>True</code> if an entry +is found, or <code>False</code> if not. +</p></dd></dl> + +<dl> +<dt><a name="index-LineTable_002esource_005flines"></a>Function: <strong>LineTable.source_lines</strong> <em>()</em></dt> +<dd><p>Return a Python <code>List</code> of the source line numbers in the symbol +table. Only lines with executable code locations are returned. The +contents of the <code>List</code> will just be the source line entries +represented as Python <code>Long</code> values. +</p></dd></dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Breakpoints-In-Python.html#Breakpoints-In-Python" accesskey="n" rel="next">Breakpoints In Python</a>, Previous: <a href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python" accesskey="p" rel="previous">Symbol Tables In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</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> |