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From: "pedro at codesourcery dot com" <sourceware-bugzilla@sourceware.org> To: gdb-prs@sourceware.org Subject: [Bug gdb/13465] typecasting in gdb python pretty-printer Date: Fri, 02 Dec 2011 12:14:00 -0000 [thread overview] Message-ID: <bug-13465-4717-N2ZArVRrZT@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-13465-4717@http.sourceware.org/bugzilla/> http://sourceware.org/bugzilla/show_bug.cgi?id=13465 Pedro Alves <pedro at codesourcery dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |pedro at codesourcery dot | |com --- Comment #2 from Pedro Alves <pedro at codesourcery dot com> 2011-12-02 12:13:32 UTC --- I think there are ways to avoid the recursion. It's not a real replacement for a value-replacement facility, but this works for me (based on py-prettyprint.py in the testsuite): ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ test.c: struct base { int a; }; struct sub { struct base base; int b; }; struct base b = { 1 }; struct sub s = { { 1 }, 2}; int main (int argc, char *argv) { return 0; } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ baseprinter.py: import re import gdb class pp_base: def __init__(self, val): self.val = val ptrtype = gdb.lookup_type('struct sub') self.castval = val.address.cast(ptrtype.pointer()).dereference () def to_string(self): disable_lookup_function () r = str(self.castval) enable_lookup_function () return r def lookup_function (val): "Look-up and return a pretty-printer that can print val." # Get the type. type = val.type # If it points to a reference, get the reference. if type.code == gdb.TYPE_CODE_REF: type = type.target () # Get the unqualified type, stripped of typedefs. type = type.unqualified ().strip_typedefs () # Get the type name. typename = type.tag if typename == None: return None # Iterate over local dictionary of types to determine # if a printer is registered for that type. Return an # instantiation of the printer if found. for function in pretty_printers_dict: if function.match (typename): return pretty_printers_dict[function] (val) # Cannot find a pretty printer. Return None. return None def disable_lookup_function (): lookup_function.enabled = False def enable_lookup_function (): lookup_function.enabled = True def register_pretty_printers (): pretty_printers_dict[re.compile ('^struct base$')] = pp_base pretty_printers_dict[re.compile ('^base$')] = pp_base pretty_printers_dict = {} register_pretty_printers () gdb.pretty_printers.append (lookup_function) $ gdb -nx -q ~/printer -ex "set python print-stack on" -ex "python execfile ('/home/pedro/printer.py')" Reading symbols from /home/pedro/printer...done. (gdb) p b $1 = {base = {a = 1}, b = 1} (gdb) p /r b $2 = {a = 1} (gdb) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ That is, disable the printer lookup function of the baseclass when you want to print it raw. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
next prev parent reply other threads:[~2011-12-02 12:14 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-12-01 19:53 [Bug gdb/13465] New: " eric at anholt dot net 2011-12-01 20:26 ` [Bug gdb/13465] " tromey at redhat dot com 2011-12-02 12:14 ` pedro at codesourcery dot com [this message] 2011-12-14 16:29 ` dje at google dot com 2012-02-07 16:01 ` [Bug python/13465] " tromey at redhat dot com
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