* pretty printer for pointers
@ 2012-06-19 9:15 graham
2012-06-21 13:57 ` Joachim Protze
0 siblings, 1 reply; 2+ messages in thread
From: graham @ 2012-06-19 9:15 UTC (permalink / raw)
To: gdb
Hi
I am trying to write some pretty printers for Qt types. I have had some success
but want to pretty print pointers to classes.
I have a printer for the type QTextDocument and want an equivalent for a pointer
to this type.
In the non printer version of the printer I have lines such as this
def children(self):
yield "isEmpty",callClassMethod(self.val,"isEmpty","")
Which works as expected
Now I want to do the same in the pointer equivalent printer but cannot see how
to do this
I have tried many things including this
def children(self):
data2 = self.val.dereference()
ptype2 = gdb.lookup_type("QTextDocument").pointer()
yield
"isEmpty",callClassMethod(data2.cast(ptype2).dereference(),"isEmpty","")
but this results in an infinite loop
My implementation of the callClassMethod function is
def callClassMethod (value,func,args):
type = value.type
#type = type.unqualified ().strip_typedefs ()
#print "type %s" % type
exp = "((class %s*)%s)->%s()" % (type, value.address, func)
print "exp = %s" % exp
#print("CALL: %s" % exp)
result = None
try:
result = gdb.parse_and_eval(exp)
except:
print "pass"
pass
#print(" -> %s" % result)
return result
I would be grateful if someone could help me solve this issue
Thanks in advance
Graham
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: pretty printer for pointers
2012-06-19 9:15 pretty printer for pointers graham
@ 2012-06-21 13:57 ` Joachim Protze
0 siblings, 0 replies; 2+ messages in thread
From: Joachim Protze @ 2012-06-21 13:57 UTC (permalink / raw)
To: graham; +Cc: gdb
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On 19.06.2012 10:27, graham wrote:
> I have tried many things including this
> def children(self):
> data2 = self.val.dereference()
> ptype2 = gdb.lookup_type("QTextDocument").pointer()
> yield
> "isEmpty",callClassMethod(data2.cast(ptype2).dereference(),"isEmpty","")
>
> but this results in an infinite loop
>
> My implementation of the callClassMethod function is
>
> def callClassMethod (value,func,args):
>
> type = value.type
> #type = type.unqualified ().strip_typedefs ()
> #print "type %s" % type
> exp = "((class %s*)%s)->%s()" % (type, value.address, func)
"%s" % value.address
is the source of your infinite loop as it triggers the pretty printer
for the pointer to value. Try
"%i" % long(value.address)
or
"0x%x" % long(value.address)
- Joachim
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