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245 lines
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4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Objfiles In Python (Debugging with GDB)</title>
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<meta name="description" content="Objfiles In Python (Debugging with GDB)">
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<meta name="keywords" content="Objfiles In Python (Debugging with GDB)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Python-API.html#Python-API" rel="up" title="Python API">
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<link href="Frames-In-Python.html#Frames-In-Python" rel="next" title="Frames In Python">
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</head>
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<body lang="en">
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<a name="Objfiles-In-Python"></a>
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<div class="header">
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<p>
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Next: <a href="Frames-In-Python.html#Frames-In-Python" accesskey="n" rel="next">Frames In Python</a>, Previous: <a href="Progspaces-In-Python.html#Progspaces-In-Python" accesskey="p" rel="prev">Progspaces 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>
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</div>
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<hr>
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<a name="Objfiles-In-Python-1"></a>
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<h4 class="subsubsection">23.2.2.24 Objfiles In Python</h4>
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<a name="index-objfiles-in-python"></a>
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<a name="index-gdb_002eObjfile"></a>
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<a name="index-Objfile"></a>
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<p><small>GDB</small> loads symbols for an inferior from various
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symbol-containing files (see <a href="Files.html#Files">Files</a>). These include the primary
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executable file, any shared libraries used by the inferior, and any
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separate debug info files (see <a href="Separate-Debug-Files.html#Separate-Debug-Files">Separate Debug Files</a>).
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<small>GDB</small> calls these symbol-containing files <em>objfiles</em>.
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</p>
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<p>The following objfile-related functions are available in the
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<code>gdb</code> module:
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</p>
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<a name="index-gdb_002ecurrent_005fobjfile"></a>
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<dl>
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<dt><a name="index-gdb_002ecurrent_005fobjfile-1"></a>Function: <strong>gdb.current_objfile</strong> <em>()</em></dt>
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<dd><p>When auto-loading a Python script (see <a href="Python-Auto_002dloading.html#Python-Auto_002dloading">Python Auto-loading</a>), <small>GDB</small>
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sets the “current objfile” to the corresponding objfile. This
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function returns the current objfile. If there is no current objfile,
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this function returns <code>None</code>.
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</p></dd></dl>
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<a name="index-gdb_002eobjfiles"></a>
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<dl>
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<dt><a name="index-gdb_002eobjfiles-1"></a>Function: <strong>gdb.objfiles</strong> <em>()</em></dt>
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<dd><p>Return a sequence of objfiles referenced by the current program space.
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See <a href="#Objfiles-In-Python">Objfiles In Python</a>, and <a href="Progspaces-In-Python.html#Progspaces-In-Python">Progspaces In Python</a>. This is identical
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to <code>gdb.selected_inferior().progspace.objfiles()</code> and is included for
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historical compatibility.
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</p></dd></dl>
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<a name="index-gdb_002elookup_005fobjfile"></a>
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<dl>
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<dt><a name="index-gdb_002elookup_005fobjfile-1"></a>Function: <strong>gdb.lookup_objfile</strong> <em>(name <span class="roman">[</span>, by_build_id])</em></dt>
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<dd><p>Look up <var>name</var>, a file name or build ID, in the list of objfiles
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for the current program space (see <a href="Progspaces-In-Python.html#Progspaces-In-Python">Progspaces In Python</a>).
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If the objfile is not found throw the Python <code>ValueError</code> exception.
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</p>
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<p>If <var>name</var> is a relative file name, then it will match any
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source file name with the same trailing components. For example, if
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<var>name</var> is ‘<samp>gcc/expr.c</samp>’, then it will match source file
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name of <samp>/build/trunk/gcc/expr.c</samp>, but not
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<samp>/build/trunk/libcpp/expr.c</samp> or <samp>/build/trunk/gcc/x-expr.c</samp>.
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</p>
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<p>If <var>by_build_id</var> is provided and is <code>True</code> then <var>name</var>
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is the build ID of the objfile. Otherwise, <var>name</var> is a file name.
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This is supported only on some operating systems, notably those which use
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the ELF format for binary files and the <small>GNU</small> Binutils. For more details
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about this feature, see the description of the <samp>--build-id</samp>
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command-line option in <a href="http://sourceware.org/binutils/docs/ld/Options.html#Options">Command Line Options</a> in <cite>The GNU Linker</cite>.
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</p></dd></dl>
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<p>Each objfile is represented by an instance of the <code>gdb.Objfile</code>
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class.
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</p>
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<dl>
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<dt><a name="index-Objfile_002efilename"></a>Variable: <strong>Objfile.filename</strong></dt>
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<dd><p>The file name of the objfile as a string, with symbolic links resolved.
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</p>
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<p>The value is <code>None</code> if the objfile is no longer valid.
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See the <code>gdb.Objfile.is_valid</code> method, described below.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002eusername"></a>Variable: <strong>Objfile.username</strong></dt>
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<dd><p>The file name of the objfile as specified by the user as a string.
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</p>
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<p>The value is <code>None</code> if the objfile is no longer valid.
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See the <code>gdb.Objfile.is_valid</code> method, described below.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002eowner"></a>Variable: <strong>Objfile.owner</strong></dt>
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<dd><p>For separate debug info objfiles this is the corresponding <code>gdb.Objfile</code>
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object that debug info is being provided for.
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Otherwise this is <code>None</code>.
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Separate debug info objfiles are added with the
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<code>gdb.Objfile.add_separate_debug_file</code> method, described below.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002ebuild_005fid"></a>Variable: <strong>Objfile.build_id</strong></dt>
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<dd><p>The build ID of the objfile as a string.
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If the objfile does not have a build ID then the value is <code>None</code>.
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</p>
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<p>This is supported only on some operating systems, notably those which use
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the ELF format for binary files and the <small>GNU</small> Binutils. For more details
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about this feature, see the description of the <samp>--build-id</samp>
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command-line option in <a href="http://sourceware.org/binutils/docs/ld/Options.html#Options">Command Line Options</a> in <cite>The GNU Linker</cite>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002eprogspace"></a>Variable: <strong>Objfile.progspace</strong></dt>
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<dd><p>The containing program space of the objfile as a <code>gdb.Progspace</code>
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object. See <a href="Progspaces-In-Python.html#Progspaces-In-Python">Progspaces In Python</a>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002epretty_005fprinters"></a>Variable: <strong>Objfile.pretty_printers</strong></dt>
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<dd><p>The <code>pretty_printers</code> attribute is a list of functions. It is
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used to look up pretty-printers. A <code>Value</code> is passed to each
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function in order; if the function returns <code>None</code>, then the
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search continues. Otherwise, the return value should be an object
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which is used to format the value. See <a href="Pretty-Printing-API.html#Pretty-Printing-API">Pretty Printing API</a>, for more
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information.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002etype_005fprinters"></a>Variable: <strong>Objfile.type_printers</strong></dt>
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<dd><p>The <code>type_printers</code> attribute is a list of type printer objects.
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See <a href="Type-Printing-API.html#Type-Printing-API">Type Printing API</a>, for more information.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002eframe_005ffilters"></a>Variable: <strong>Objfile.frame_filters</strong></dt>
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<dd><p>The <code>frame_filters</code> attribute is a dictionary of frame filter
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objects. See <a href="Frame-Filter-API.html#Frame-Filter-API">Frame Filter API</a>, for more information.
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</p></dd></dl>
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<p>One may add arbitrary attributes to <code>gdb.Objfile</code> objects
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in the usual Python way.
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This is useful if, for example, one needs to do some extra record keeping
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associated with the objfile.
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</p>
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<p>In this contrived example we record the time when <small>GDB</small>
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loaded the objfile.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) python
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import datetime
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def new_objfile_handler(event):
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# Set the time_loaded attribute of the new objfile.
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event.new_objfile.time_loaded = datetime.datetime.today()
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gdb.events.new_objfile.connect(new_objfile_handler)
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end
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(gdb) file ./hello
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Reading symbols from ./hello...done.
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(gdb) python print gdb.objfiles()[0].time_loaded
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2014-10-09 11:41:36.770345
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</pre></div>
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<p>A <code>gdb.Objfile</code> object has the following methods:
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</p>
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<dl>
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<dt><a name="index-Objfile_002eis_005fvalid"></a>Function: <strong>Objfile.is_valid</strong> <em>()</em></dt>
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<dd><p>Returns <code>True</code> if the <code>gdb.Objfile</code> object is valid,
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<code>False</code> if not. A <code>gdb.Objfile</code> object can become invalid
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if the object file it refers to is not loaded in <small>GDB</small> any
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longer. All other <code>gdb.Objfile</code> methods will throw an exception
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if it is invalid at the time the method is called.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Objfile_002eadd_005fseparate_005fdebug_005ffile"></a>Function: <strong>Objfile.add_separate_debug_file</strong> <em>(file)</em></dt>
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<dd><p>Add <var>file</var> to the list of files that <small>GDB</small> will search for
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debug information for the objfile.
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This is useful when the debug info has been removed from the program
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and stored in a separate file. <small>GDB</small> has built-in support for
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finding separate debug info files (see <a href="Separate-Debug-Files.html#Separate-Debug-Files">Separate Debug Files</a>), but if
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the file doesn’t live in one of the standard places that <small>GDB</small>
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searches then this function can be used to add a debug info file
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from a different place.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Frames-In-Python.html#Frames-In-Python" accesskey="n" rel="next">Frames In Python</a>, Previous: <a href="Progspaces-In-Python.html#Progspaces-In-Python" accesskey="p" rel="prev">Progspaces 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>
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