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| <title>Debugging with GDB: Progspaces In Python</title> |
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| <a name="Progspaces-In-Python"></a> |
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| 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="prev">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> |
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| <a name="Program-Spaces-In-Python"></a> |
| <h4 class="subsubsection">23.2.2.22 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-and-Programs.html#Inferiors-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-and-Programs.html#Inferiors-and-Programs">Inferiors and Programs</a>. |
| </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>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...done. |
| 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> |
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