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Date: Tue, 10 Aug 2010 10:57:00 -0000
From: Joachim Protze <joachim.protze@wh2.tu-dresden.de>
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To: gdb@sourceware.org
Subject: Re: Crashing gdb with python-prettyprinting
References: <4C4EFC98.7080105@wh2.tu-dresden.de> <m3k4oc6ayc.fsf@fleche.redhat.com> <4C5FF231.7030203@zih.tu-dresden.de>
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I found a little mistake in my condensed version of the python part.
Appended the corrected versions.

-Joachim



----------------- pptest.c -----------------
enum test_enum{
  zero,
  one,
  two,
  three,
  four,
  five,
};

typedef int testint;

enum test_enum get_test_enum(int i){
  return (enum test_enum)i;
}

int main(int argc, char* argv[]){

  testint a, b, c, d, e, f;
  testint arr[]={0,1,2,3,4,5};

  a=0;
  b=1;
  c=2;
  d=3;
  e=4;
  f=5;

  return 0;
}

----------------- pptest.py -----------------
import gdb
import re

class pp_test:
    """testprinter with code interaction"""
    def __init__(self, id):
        self.id = id
    def to_string(self):
        return str(gdb.parse_and_eval("get_test_enum(%i)" % self.id))

def lookup_function (val):
    '''Look-up and return a pretty-printer that can print val.'''
    type = val.type;
    # If it points to a reference, get the reference.
    if type.code == gdb.TYPE_CODE_REF:
        type = type.target ()
    typename = str(type)
    for function in pp_dict:
        if function.search (typename):
            result = pp_dict[function] (val)
            return result
    return None

pp_dict = {}
pp_dict[re.compile('^testint$')] = lambda val: pp_test(val)
gdb.pretty_printers = []
gdb.pretty_printers.append (lookup_function)