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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 | 6ce4ebed87858ecdd79a1091367c6e961055daa9 (patch) | |
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diff --git a/share/doc/gdb/Progspaces-In-Python.html b/share/doc/gdb/Progspaces-In-Python.html new file mode 100644 index 0000000..46f9775 --- /dev/null +++ b/share/doc/gdb/Progspaces-In-Python.html @@ -0,0 +1,228 @@ +<!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: Progspaces In Python</title> + +<meta name="description" content="Debugging with GDB: Progspaces In Python"> +<meta name="keywords" content="Debugging with GDB: Progspaces 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="Objfiles-In-Python.html#Objfiles-In-Python" rel="next" title="Objfiles In Python"> +<link href="Functions-In-Python.html#Functions-In-Python" rel="previous" title="Functions 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="Progspaces-In-Python"></a> +<div class="header"> +<p> +Next: <a href="Objfiles-In-Python.html#Objfiles-In-Python" accesskey="n" rel="next">Objfiles In Python</a>, Previous: <a href="Functions-In-Python.html#Functions-In-Python" accesskey="p" rel="previous">Functions 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="Program-Spaces-In-Python"></a> +<h4 class="subsubsection">23.3.2.24 Program Spaces In Python</h4> + +<a name="index-progspaces-in-python"></a> +<a name="index-gdb_002eProgspace"></a> +<a name="index-Progspace"></a> +<p>A program space, or <em>progspace</em>, represents a symbolic view +of an address space. +It consists of all of the objfiles of the program. +See <a href="Objfiles-In-Python.html#Objfiles-In-Python">Objfiles In Python</a>. +See <a href="Inferiors-Connections-and-Programs.html#Inferiors-Connections-and-Programs">program spaces</a>, for more details +about program spaces. +</p> +<p>The following progspace-related functions are available in the +<code>gdb</code> module: +</p> +<a name="index-gdb_002ecurrent_005fprogspace"></a> +<dl> +<dt><a name="index-gdb_002ecurrent_005fprogspace-1"></a>Function: <strong>gdb.current_progspace</strong> <em>()</em></dt> +<dd><p>This function returns the program space of the currently selected inferior. +See <a href="Inferiors-Connections-and-Programs.html#Inferiors-Connections-and-Programs">Inferiors Connections and Programs</a>. This is identical to +<code>gdb.selected_inferior().progspace</code> (see <a href="Inferiors-In-Python.html#Inferiors-In-Python">Inferiors In Python</a>) and is +included for historical compatibility. +</p></dd></dl> + +<a name="index-gdb_002eprogspaces"></a> +<dl> +<dt><a name="index-gdb_002eprogspaces-1"></a>Function: <strong>gdb.progspaces</strong> <em>()</em></dt> +<dd><p>Return a sequence of all the progspaces currently known to <small>GDB</small>. +</p></dd></dl> + +<p>Each progspace is represented by an instance of the <code>gdb.Progspace</code> +class. +</p> +<dl> +<dt><a name="index-Progspace_002efilename"></a>Variable: <strong>Progspace.filename</strong></dt> +<dd><p>The file name of the progspace as a string. +</p></dd></dl> + +<dl> +<dt><a name="index-Progspace_002epretty_005fprinters"></a>Variable: <strong>Progspace.pretty_printers</strong></dt> +<dd><p>The <code>pretty_printers</code> attribute is a list of functions. It is +used to look up pretty-printers. A <code>Value</code> is passed to each +function in order; if the function returns <code>None</code>, then the +search continues. Otherwise, the return value should be an object +which is used to format the value. See <a href="Pretty-Printing-API.html#Pretty-Printing-API">Pretty Printing API</a>, for more +information. +</p></dd></dl> + +<dl> +<dt><a name="index-Progspace_002etype_005fprinters"></a>Variable: <strong>Progspace.type_printers</strong></dt> +<dd><p>The <code>type_printers</code> attribute is a list of type printer objects. +See <a href="Type-Printing-API.html#Type-Printing-API">Type Printing API</a>, for more information. +</p></dd></dl> + +<dl> +<dt><a name="index-Progspace_002eframe_005ffilters"></a>Variable: <strong>Progspace.frame_filters</strong></dt> +<dd><p>The <code>frame_filters</code> attribute is a dictionary of frame filter +objects. See <a href="Frame-Filter-API.html#Frame-Filter-API">Frame Filter API</a>, for more information. +</p></dd></dl> + +<p>A program space has the following methods: +</p> +<a name="index-Progspace_002eblock_005ffor_005fpc"></a> +<dl> +<dt><a name="index-Progspace_002eblock_005ffor_005fpc-1"></a>Function: <strong>Progspace.block_for_pc</strong> <em>(pc)</em></dt> +<dd><p>Return the innermost <code>gdb.Block</code> containing the given <var>pc</var> +value. If the block cannot be found for the <var>pc</var> value specified, +the function will return <code>None</code>. +</p></dd></dl> + +<a name="index-Progspace_002efind_005fpc_005fline"></a> +<dl> +<dt><a name="index-Progspace_002efind_005fpc_005fline-1"></a>Function: <strong>Progspace.find_pc_line</strong> <em>(pc)</em></dt> +<dd><p>Return the <code>gdb.Symtab_and_line</code> object corresponding to the +<var>pc</var> value. See <a href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python">Symbol Tables In Python</a>. If an invalid value +of <var>pc</var> is passed as an argument, then the <code>symtab</code> and +<code>line</code> attributes of the returned <code>gdb.Symtab_and_line</code> +object will be <code>None</code> and 0 respectively. +</p></dd></dl> + +<a name="index-Progspace_002eis_005fvalid"></a> +<dl> +<dt><a name="index-Progspace_002eis_005fvalid-1"></a>Function: <strong>Progspace.is_valid</strong> <em>()</em></dt> +<dd><p>Returns <code>True</code> if the <code>gdb.Progspace</code> object is valid, +<code>False</code> if not. A <code>gdb.Progspace</code> object can become invalid +if the program space file it refers to is not referenced by any +inferior. All other <code>gdb.Progspace</code> methods will throw an +exception if it is invalid at the time the method is called. +</p></dd></dl> + +<a name="index-Progspace_002eobjfiles"></a> +<dl> +<dt><a name="index-Progspace_002eobjfiles-1"></a>Function: <strong>Progspace.objfiles</strong> <em>()</em></dt> +<dd><p>Return a sequence of all the objfiles referenced by this program +space. See <a href="Objfiles-In-Python.html#Objfiles-In-Python">Objfiles In Python</a>. +</p></dd></dl> + +<a name="index-Progspace_002esolib_005fname"></a> +<dl> +<dt><a name="index-Progspace_002esolib_005fname-1"></a>Function: <strong>Progspace.solib_name</strong> <em>(address)</em></dt> +<dd><p>Return the name of the shared library holding the given <var>address</var> +as a string, or <code>None</code>. +</p></dd></dl> + +<p>One may add arbitrary attributes to <code>gdb.Progspace</code> objects +in the usual Python way. +This is useful if, for example, one needs to do some extra record keeping +associated with the program space. +</p> +<p>In this contrived example, we want to perform some processing when +an objfile with a certain symbol is loaded, but we only want to do +this once because it is expensive. To achieve this we record the results +with the program space because we can’t predict when the desired objfile +will be loaded. +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) python +def clear_objfiles_handler(event): + event.progspace.expensive_computation = None +def expensive(symbol): + """A mock routine to perform an "expensive" computation on symbol.""" + print ("Computing the answer to the ultimate question ...") + return 42 +def new_objfile_handler(event): + objfile = event.new_objfile + progspace = objfile.progspace + if not hasattr(progspace, 'expensive_computation') or \ + progspace.expensive_computation is None: + # We use 'main' for the symbol to keep the example simple. + # Note: There's no current way to constrain the lookup + # to one objfile. + symbol = gdb.lookup_global_symbol('main') + if symbol is not None: + progspace.expensive_computation = expensive(symbol) +gdb.events.clear_objfiles.connect(clear_objfiles_handler) +gdb.events.new_objfile.connect(new_objfile_handler) +end +(gdb) file /tmp/hello +Reading symbols from /tmp/hello... +Computing the answer to the ultimate question ... +(gdb) python print gdb.current_progspace().expensive_computation +42 +(gdb) run +Starting program: /tmp/hello +Hello. +[Inferior 1 (process 4242) exited normally] +</pre></div> + +<hr> +<div class="header"> +<p> +Next: <a href="Objfiles-In-Python.html#Objfiles-In-Python" accesskey="n" rel="next">Objfiles In Python</a>, Previous: <a href="Functions-In-Python.html#Functions-In-Python" accesskey="p" rel="previous">Functions 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> |